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JP2005064932

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DESCRIPTION JP2005064932
An object of the present invention is to provide a low cost, high performance, high quality direct
drive screen speaker system that facilitates the production of the screen speaker system in
producing a direct drive screen speaker system. A directly driven screen speaker system in which
an image is projected by a projector from the front of a screen 1 and the screen 1 is directly
driven to emit sound from a front surface of the screen 1, the screen 1 is thin. A driving member
including a coil 3 for driving the screen 1 is mounted on the screen 1, and when the screen 1 is
erected, the driving member is inclined by its own weight and is in a magnetic gap. The intensity
of the screen was maintained so as not to touch the magnetic circuit 4. [Selected figure] Figure
10
スクリーンスピーカシステム
[0001]
The present invention relates to a direct drive screen speaker system which directly drives a
screen and emits sound from the front of the screen.
[0002]
In the conventional home theater system, as the screen becomes larger, it is pointed out that the
localization of the sound on the screen, especially in the central part of the screen, is significantly
different from that on the screen. A direct drive screen speaker system has been proposed which
seeks the diaphragm function of the speaker and directly drives the other side of the screen to
project the image, that is, the back side, and emits the missing sound at the center of the screen. .
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1
In a conventional direct drive screen speaker system, a part of a housing, ie, a part corresponding
to a baffle board of a speaker cabinet is regarded as a screen, and the baffle is driven by a voice
coil and a magnetic circuit used in the conventional speaker. ing. Therefore, since the baffle
board, that is, the screen part is a part of the housing, the thickness of the screen material is
necessarily kept thick, and the screen outer part is a directly driven screen speaker having a
structure fixed to the housing A system has been proposed.
[0003]
In the direct drive type screen speaker system in this conventional example, the thickness of the
screen is a thickness which maintains a certain degree of housing strength, for example, a hard
board of about 3 mm to 5 mm in thickness, or an aluminum plate etc. is selected as the screen
material. The screen outer part is fixed to a housing, and the back surface side of the screen
material, that is, the baffle board is driven by a voice coil and a magnetic circuit or the like
originally for driving the diaphragm of the speaker.
[0004]
Therefore, in the structure of the above-mentioned conventional example, a flat plate is driven.
As a matter of course, the screen part which is much heavier than the diaphragm of a general
speaker and which is a baffle part of a large area is assumed to be driven as a diaphragm, and is
generally used for speakers. Even if the screen unit is driven by a magnetic circuit and a voice
coil, the screen unit is difficult to function as a diaphragm, and it can be said that the structure
has a defect that it is difficult to obtain sound pressure in a necessary reproduction frequency
band.
[0005]
Moreover, since the flat diaphragm having an extremely large area is driven, the screen part
easily causes divided vibration, and it is extremely difficult to obtain a desired reproduced sound,
so the originally good sound quality is obtained. It is obvious that the structure is difficult to
obtain. Therefore, in order to eliminate the above-mentioned drawbacks, a groove is machined to
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2
a predetermined depth around the periphery of the screen on which the drive component such as
a voice coil is attached, and the compliance is locally increased to make part of the screen more
oscillated. A method of making the sound pressure easy and obtaining a desired sound pressure
has been proposed.
[0006]
However, the biggest advantage of the screen is that it is easy to obtain a large screen. Generally,
the screen size is about 50 inches and the minimum size is about 70 inches to 100 inches.
Therefore, it is difficult to install such a large size screen material on a general processing
machine and further to form a groove at a desired position. In other words, it has the
disadvantage that it is not commonplace for the machine to have no pockets, and the installation
of a special large-scale processing machine is indispensable for applying the above-mentioned
processing, and the cost becomes large. Things can be easily imagined.
[0007]
Therefore, the groove processing etc. in the above-mentioned conventional example has a defect
that actual processing is difficult, and it is a proposal which is poor in feasibility and, even if the
groove processing is possible, it is a large screen material. It is obvious that the installation in the
processing machine and the removal after the processing inevitably increase the man-hour, and
moreover, the above-mentioned grooving must be mainly cut by a milling cutter or a router. In
general, cutting has many man-hours, that is, a long processing time, and thus has a drawback
that the processing cost is high.
[0008]
In addition, the direct drive type screen speaker system in these conventional examples mounts
the bobbin end of the voice coil by some means, such as bonding, in order to drive the back
surface side of the screen. A drive for mounting a suspension for supporting a voice coil referred
to as a damper or a spider, the outer periphery of the suspension being mounted on a magnetic
circuit for driving the voice coil, that is, a voice coil The drive unit, which integrates the magnetic
circuit and the magnetic circuit, is mounted on the back of the screen.
[0009]
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3
The structure for driving the back side of the screen by the drive unit integrates the voice coil
and the magnetic circuit, has an advantage over one side such as handling of the drive unit, while
it is mounted on the direct drive screen speaker system There are serious drawbacks in
That is, although the tip of the voice coil for driving the screen is attached by some method, for
example, bonding, it goes without saying that the diameter of the voice coil is smaller than the
diameter of the magnetic circuit, and the difference is 3 times From the back side of the magnetic
circuit can not see the tip of the voice coil from the back side.
[0010]
Therefore, when mounting the drive unit, it is impossible or extremely difficult to check the
mounting state of the voice coil tip and the screen back side. Furthermore, it is even more so
when the yoke bottom which constitutes the magnetic circuit is attached to the back plate which
constitutes the screen speaker system housing. That is, in the structure of the conventional
example, as the direct drive screen speaker system, it can not be confirmed whether the
mounting state of the voice coil tip and the back side of the screen is mounted as desired or not
as designed. It has a structure that has to be completed.
[0011]
Generally the voice coil tip for driving the diaphragm and the mounting portion with the
diaphragm are required to be extremely uniform, and the non-uniformity of the mounting portion
becomes the variation in sound quality, so extremely delicate assembly is required Be done.
Therefore, it is an important element in order to stabilize the quality that at least the visual
confirmation of the mounting portion and the various inspections of the mounting state are
possible.
[0012]
Further, the voice coil is disposed in a magnetic gap formed by a magnetic circuit, and the gap is
extremely narrow. However, in the conventional example, since it is configured as described
above, it is a structure that supports only one place of the outer periphery of the voice coil
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4
bobbin. The above-mentioned structure is a structure in which the voice coil is easily inclined
even if a slight bias load due to disturbance is applied to the voice coil bobbin.
[0013]
Even when the voice coil is slightly inclined, the coil portion attached to the lower end portion of
the voice coil bobbin can easily touch the magnetic gap to cause an abnormal sound, which also
causes a variation in sound quality. Therefore, the voice coil of the drive unit of the prior art must
be accurately mounted at a predetermined position on the back surface side of the screen
without tilting and perpendicular to the screen driving surface (back surface).
[0014]
However, in the structure of the conventional example, as described above, it can be said that
mounting the voice coil tip on the back side of the screen is extremely poor in realization while
maintaining the predetermined accuracy. In other words, the screen speaker system has to be
larger in size than a general case due to its nature on the premise of a large screen. The abovementioned features generally have the disadvantage that machining accuracy is difficult to
obtain, such as position dimensions. Therefore, it is extremely difficult to manufacture a direct
drive type screen speaker system in the above-mentioned conventional example, and it is beyond
the scope of a mere proposal.
[0015]
JP, 2002-27588, A true fair 7-13344
[0016]
The present invention solves the problems of the above-mentioned conventional example, and in
the manufacture of a direct drive screen speaker system, the manufacture of the screen speaker
system is facilitated, and a low cost, high performance, high quality direct drive screen speaker
system The purpose is to provide
[0017]
In order to solve the above problems, the present invention is directed to a directly driven screen
speaker system which projects an image with a projector from the front of the screen and
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5
directly drives the screen to emit sound from the front of the screen. The screen is a thin plate
material, and a driver including a coil for driving the screen is attached to the screen, and when
the screen is erected, the driver is inclined by its own weight to be in a magnetic gap. The
intensity of the screen is maintained so as not to touch the magnetic circuit.
[0018]
Further, a housing including a side plate and a back plate is formed on the back side of the
projection surface of the screen, an end of the screen is fixed to the side plate, and a plurality of
support rods are provided between the back plate and the screen back surface. And the end of
the support is fixed to the back plate and the back of the screen.
[0019]
Further, a suspension made of an elastic material is interposed between the support and the back
surface of the screen.
[0020]
Further, a driving body including a moving coil for driving the screen is mounted on the back
surface side of the screen, a driving source including a magnetic circuit for driving the driving
body is mounted on the back plate side, and the driving body and the driver By not providing the
suspension between the drive sources, the drive body and the drive sources can be separated
from each other.
[0021]
Further, a flange portion is formed on an outer peripheral portion or an inner peripheral portion
of a tip of a coil bobbin constituting the moving coil, and the flange portion is attached and fixed
to the back surface of the screen.
[0022]
Further, the screen is composed of at least one plate material.
[0023]
Furthermore, the material which comprises the said screen is comprised by the lamination |
stacking board | plate material which laminated | stacked several sheets and was used as the
board | plate material of 1 sheet.
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[0024]
Further, the surface side of the screen is subjected to an optical surface treatment.
[0025]
Further, the screen material constituting the screen is made of a light metal such as aluminum or
a light metal alloy.
[0026]
In addition, the thickness of the screen material is 2 mm or less, preferably 1 mm or less.
[0027]
Further, the screen material is anodized.
[0028]
Further, a positioning guide portion for mounting the driving body is provided on the housing,
the moving coil is mounted and fixed based on the guide portion, and the position of the driving
source is further determined by the positioning guide portion. It is mounted at a position
corresponding to the moving coil, and the gap position between the coil and the magnetic circuit
is optimized.
[0029]
Furthermore, an input terminal is mounted on the back side of the screen.
[0030]
Moreover, the relay terminal for input is provided in the predetermined position of the said
housing | casing.
[0031]
Further, the input terminal and the relay terminal are connected by a tinsel wire.
[0032]
Further, the flange portion is provided with an input terminal.
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7
[0033]
Furthermore, another speaker can be disposed at the lower end portion or the side end portion of
the screen, and the other speakers can be separated from the screen.
[0034]
According to the present invention, it is possible to facilitate manufacture and to provide a low
cost, high performance, high quality direct drive screen speaker system.
[0035]
Hereinafter, a direct drive screen speaker system according to the present invention will be
described by way of embodiments.
[0036]
An embodiment of the present invention will be described based on FIGS. 1 to 20. FIG.
The housing 2 is composed of a side plate 21, a back plate 22, and an intermediate crosspiece
23.
The material of the side plate 21 is a plywood made by laminating a single material, commonly
called ash material, to an arbitrary thickness and laminating three sheets of this material, the
plywood is processed to a thickness of 24 mm and a width of 35 mm. Two 1810 mm plates
(hereinafter referred to as the longitudinal side plates 21L).
And 1010 mm (hereinafter referred to as the short side plate 21S).
It consists of 2).
[0037]
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8
Furthermore, as shown in the cross-sectional view of FIG. 3, the cross-sections of the longitudinal
side plate 21L and the short side plate 21S are the front side, that is, the side on which the
screen 1 is mounted It is provided.
Also, the side on which back plate 22 is mounted, ie, the back side, is grooved 9 mm wide and 8.8
mm deep from the outer 10 mm position, and further, 3.8 mm wide and 5 mm high inside 9 mm
wide. Hozo processing 21b is applied.
Further, as shown in FIG. 3, long holes of 10 mm in width and 150 mm in length are processed at
predetermined positions and three places of the longitudinal side plate 21L, and further, the
inner side portion of the side plate is the longest of the side plates. The groove is processed at a
position of 282 mm and 19 mm wide and 4.5 mm deep from the center of the side portion, but
the processed portion becomes the middle cross 23 mounting portion described later.
[0038]
The back plate 22 is a plate material generally called MDF (medium density fiber board), and has
a thickness of 9 mm.
The MDF is cut to 1788 mm in the long side and 988 mm in the short side, and the outermost
sides of the long side and the short side are made to have a width of 8.8 corresponding to the
longitudinal side plate 21L and the short side plate 21S as shown in FIGS. Over 3 mm, the
thickness regulation 22c is processed to a thickness of 8.8 mm, and a groove 22b having a width
of 5.2 mm and a depth of 4 mm is further processed inside the thickness regulation portion.
Also, processing of thickness regulation 22c is performed at a width of 19 mm and a thickness of
8.8 mm at a position of 282 mm distributed to the left and right from the center of the long side
of the back plate 22, and the processed portion becomes the middle cross 23 mounting portion
described later .
[0039]
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9
Furthermore, in order to drive the screen 1 to a total of three locations, the center of the back
plate 22, that is, the point where the center lines of the long side and the short side intersect, and
the position distributed to 586 mm in the long side direction from the center. In the case of this
embodiment, in the case of the present embodiment, a hole having a diameter of 127.6 mm
(hereinafter referred to as a housing mounting hole 22h) for the purpose of mounting the
magnetic circuit 4 mounting housing 4H for mounting the magnetic circuit 4.
) And further regulated to a thickness of 8 mm. The counterbore portion having a diameter of
151.6 mm (hereinafter referred to as a counterbore portion 22d for mounting the housing 4H).
Are provided concentrically at a diameter of 138.8 mm in eight 45-degree divisions from the
back surface of the counterbore 22d for mounting the housing 4H.
Furthermore, an input terminal 8 board mounting hole 22t of about 47 mm is provided at a
position 55 mm from the lower end of the back plate 22 as shown in the figure on the center line
of the hole corresponding to the housing mounting hole 22h.
[0040]
Also, as shown in FIGS. 1 and 2, the outer circumference of the counterbore 22d for housing 4H
attachment has a diameter of 236 mm, a diameter of 368 mm, a diameter of 488 mm, a diameter
of 596 mm, a diameter of 692 mm, a diameter of 776 mm, and concentricity of 848 mm, divided
by 60 degrees. A counterbore portion (hereinafter referred to as a counterbore portion for
support 22p) regulated at a diameter of 21 mm and a thickness of 8 mm at the position of.
) Was provided.
However, as shown in FIG. 1, the positions divided by 60 degrees are arranged at positions
shifted by 30 degrees at positions of diameter 236 mm, diameter 488 mm, diameter 692 mm,
diameter 848 mm, and diameter 368 mm, diameter 596 mm, diameter 776 mm. .
In addition, since the center rail 23 mounting portion is a boundary, four positions of diameter
596 mm and diameter 848 mm, two positions of 776 mm, and six positions of the counterbored
11-05-2019
10
portion 22p for the other are arranged.
[0041]
There are two middle bars 23, which are attached for adhesively bonding the back plate 22 and
the longitudinal side plate 21L attached to the long side of the back plate 22 and maintaining the
necessary strength of the housing 2, The material of the middle cross 23 is a plywood made by
laminating 3 sheets of ash material as in the case of the side plate 21 and laminating the same,
18 mm thick, 25.2 mm wide and 971 mm long. It has been processed to
Further, as shown in FIGS. 3 and 4, holes of 12 mm in diameter are provided at predetermined
positions 17 in the thickness direction for sound quality adjustment.
The hole may not be provided.
Furthermore, as shown in the figure, the side disposed on the screen back surface 1b is cut at a
depth of 2 mm with both ends remaining at 205.5 mm, that is, 560 mm in the center direction in
the longitudinal direction.
[0042]
The thickness restricting portion 22c for attaching the side plate 21 of the back plate 22, the
groove 22b, the thickness restricting portion 22c for attaching the middle bar 23, the groove 21c
for attaching the back plate of the side plate 21, and the end 21b, A predetermined amount of
adhesive bo is applied to the bonding portion of the middle frame 23 and adhesively attached to
the inner side of the back plate 22, that is, the inner side of the housing 2 as shown in FIG. An
adhesive bo was applied to the portion, and as shown in FIG. 6 and FIG. 7, it was installed on the
mounting counterbore portion 22d of the magnetic circuit mounting housing 4H and fastened
with eight countersunk screws 4 mm from the back side of the counterbore portion.
The magnetic circuit 4 mounting housing 4H was mounted on the inner side of the back plate 22,
that is, the inner side of the housing 2 by a so-called attachment method using screw fastening.
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[0043]
Furthermore, the support 5 having a predetermined length was attached to the support
countersunk portion 22p.
In the case of this embodiment, as shown in FIG. 8, a single material having a diameter of 18 mm
is used, and five types of struts 5 of 22 mm, 23 mm, 24 mm, 25 mm, 26 mm are used. 22 mm
length pillars 5 in 6 points of 368 mm diameter, 5 mm length 5 mm in 5 points of 488 mm
diameter post holes, 596 mm in diameter Six columns (a total of 18 columns) of 25 mm long
columns 5 were adhesively fixed to the six counterbore portions by hot melt.
In addition, the remaining column counterbore 22p, that is, four counterbore portions with a
diameter of 692 mm, two counterbore portions with a diameter of 776 mm, and four
counterbore portions with a diameter of 848 mm (total 36 points) are all in length. The support
5 of 26 mm was adhesively fixed by the same hot melt as described above.
[0044]
Furthermore, a cushion 6 material with a diameter of 18 mm and a thickness of 4 mm is on the
top of the 22 mm pillar 5, and a cushion 6 material with a diameter of 18 mm and a thickness of
3 mm is on a top of the 23 mm support 5. The cushion 6 material having a diameter of 18 mm
and a thickness of 2 mm was attached to the top, and the cushion 6 material having a diameter of
18 mm and a thickness of 1 mm was attached to the top of a 25 mm support 5 by bonding of 6
sheets (18 sheets in total).
In the case of the present embodiment, the cushion 6 uses a self-expanding rubber. Further, a
cushion 6 material having a thickness of 2 mm, a width of 18 mm, and a length of 560 mm was
attached by adhesion also to a cutting portion of 560 mm in the middle crosspiece 23 and a
depth of 2 mm.
[0045]
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12
Further, as shown in FIG. 9, the input terminal board is attached to the input terminal 8 board
mounting hole, and further the screen 1 is driven. In the case of this embodiment, the voice is
inputted to the voice coil 3 attached directly to the screen back surface 1b. The lead wire for the
input signal is attached to the back plate 22 so as to extend to the inside of the case 2 of the back
plate 22, one end of the lead is connected to the input terminal 8, and the other lead end is The
terminal is fixed at a predetermined position near the magnetic circuit 4 mounting housing 4H
while maintaining a necessary and sufficient distance from the input terminal of the screen 1
driving voice coil 3. Although the mounting method in the case of the present embodiment is
directly attached to the back plate 22 using a lead wire fixing staple, the mounting method is not
limited to the above method, and may be freely according to the purpose.
[0046]
As shown in FIG. 10, the screen 1 mounting portion of the side plate 21 and the cushion 6
portion attached to the middle cross 23 and the middle cross 23 and the cushion 6 provided on
the top of the post 5 and the top of the post 5 After applying a predetermined amount of
adhesive bo and placing the back side of the outer side of the screen material on the screen 1
mounting portion of the side plate 21, a predetermined pressure is applied to the entire surface
of the screen 1 with a press, for a predetermined time, That is, the screen 1 was attached to the
side plate 21, that is, the housing 2 while keeping the pressure for a sufficient time for the
adhesive bo to exhibit a predetermined adhesive strength.
[0047]
Thereby, the cushions 6 provided on the center cross 23, the support 5, the center cross 23, and
the support 5 are also adhered to the screen back surface 1b side.
Therefore, the back side of the screen 1 is supported by the cushion 6 material disposed radially
from the position of 586 mm on the center line intersection of the long side and the short side of
the screen 1 and the center line in the short side direction. And, the cushion 6 material is thick so
that the inner side is thick and thin as it is placed on the outer side, and is fixed to the solid
material from a predetermined position, that is, the position of the column 5 with a diameter of
692 mm.
[0048]
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13
Therefore, the screen 1 which is the diaphragm from the vicinity of the central portion of the
screen 1 divided by the middle cross 23 to the vicinity of the outer peripheral portion is very
firmly fixed to the housing 2 the outer side of the screen 1 having the diaphragm function. The
structure has a suspension function capable of swinging, and the central portion of the screen 1
partitioned by the center crosspiece 23 is easily swinging, and the swing is gradually limited as it
extends to the outer side. In the case of the present embodiment, such a support 5 is arranged,
but the arrangement of the support 5 can be freely arranged according to the design purpose,
and the thickness of the cushion 6 material as the suspension can be freely set according to the
purpose It is possible.
[0049]
In this example, the screen material is chemically treated to give a predetermined roughness on
the surface of an aluminum plate having a thickness of 1 mm, and after anodizing treatment, an
acrylic clear paint for preventing stains is electrodeposited. I used what I did. In the case of the
present embodiment, the aluminum plate is used as the screen 1, but the material or the like can
be selected according to the required performance of the screen 1, that is, the diaphragm.
[0050]
The voice coil 3 for driving the screen material is made of aluminum plate having a thickness of
0.1 mm, and the inner diameter of the bobbin is 30.4 mm and the height (width) of the bobbin is
12 mm. A copper clad aluminum wire with a diameter of 0.21 mm (maximum diameter 0.248
mm including bottom plate layer) is aligned wound with 4 layers with a total width of 94 turns at
a width of about 6.2 mm at the lower end, with a DC resistance of 6.8 Ω The voice coil 3 of ±
0.3Ω is obtained, and further, as shown in FIG. 12, the voice coil 3 and the flange for mounting
the input terminal 8 (hereinafter referred to as a terminal flange 7). ) And the terminal flange 7
was attached to the end of the voice coil bobbin 31.
[0051]
The terminal flange 7 is mainly for the purpose of firmly attaching the voice coil 3 to the back
surface 1b of the screen, and for attaching the input terminal 8 for supplying an audio signal to
the voice coil 3 as a main object. Flange 7 is a ring shape with a thickness of 3 mm, an outer
diameter of 63 mm, and an inner diameter of 30.8 mm, and two holes for mounting the input
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terminal 8 are provided at a diameter of 52.7 mm (distributed 180 degrees) from the center as
shown in FIG. However, one side (plus side) is a square hole of 3 mm on one side, and the other
side (minus side) is a square hole of 2.5 mm. In the case of the present embodiment, the material
of the terminal flange 7 is fiber reinforced phenolic resin.
[0052]
As shown in FIGS. 13 and 14, the lug mounting square hole is provided with a counterbore
portion having a diameter of 8 mm and a depth of 1.5 mm concentrically to the square hole on
one surface of the terminal flange 7; The surface on which the portion is provided is the screen 1
mounting surface. The terminal lugs are commonly used in the general public and consist of an
alloy for terminal lugs with a thickness of 0.5 mm, and those generally called faston terminals are
used, and the voice coil 3 mounting side as shown in the figure. From the point of view, the
terminal lug for the positive was attached on the right side, and the terminal lug for the negative
was attached on the left side. The mounting was performed by caulking using a general press,
and the caulking portions of the terminal lugs were spread in a cross shape and caulking was
performed on the substrate, that is, the terminal flange 7 in this embodiment.
[0053]
Next, the voice coil 3 and the terminal flange 7 are attached to each other, but since the terminal
flange 7 must be attached perpendicularly to the outer peripheral portion of the voice coil
bobbin 31, the assembly jig J1 as shown in FIG. Mounted. As described below, the assembly jig
J1 is convex in cross section and has a total height of 18 mm. The central pole portion is 30.36
mm in diameter and 12 mm in height corresponding to the inner diameter of the voice coil 3.
[0054]
As shown in FIG. 12 to FIG. 14, the terminal flange 7 with the input terminal 8 lug is disposed at
the bottom of the assembly jig. Furthermore, after applying a two-component mixed acrylic
adhesive bo to the tip of the voice coil bobbin 31 uniformly and in a cord shape in an amount of
about 0.28 g, assembly with the terminal flange 7 already arranged The inner diameter of the
voice coil bobbin 31 is inserted into the mounting portion in the pole portion of the jig. As shown
in FIG. 14, on the side where the voice coil 3 is attached on the terminal flange 7, the inner
diameter portion is chamfered to C1 mm.
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[0055]
Therefore, when the inserted voice coil 3 is inserted until the end of the voice coil bobbin 31
descends along the C-chamfered portion, is guided to the inner diameter of the terminal flange 7
and further hits the jig bottom, the end of the voice coil bobbin 31 The adhesive bo applied to
adheres to the inner diameter portion (vertical portion in the cross-sectional view) of the terminal
flange 7 and the C chamfered portion becomes a reservoir of the adhesive bo, so as to exhibit a
predetermined adhesive strength.
[0056]
After bonding the voice coil 3 to the terminal flange 7, the voice coil 3 lead wire is connected to
the terminal lug as shown in FIG. 14, but as shown in FIG. The positions of the side and negative
side terminals and the voice coil 3 lead wire are aligned and inserted.
In the case of this example, the winding start side of the voice coil 3 wire was mounted on the
plus side, and the winding end side was mounted on the minus side. The lead wire of the voice
coil 3 is rolled to the terminal lug and soldered, and the portion of the lead wire wound around
the terminal flange 7 is covered with the adhesive bo, and the connection wiring between the
voice coil 3 and the input terminal 8 is completed Do.
[0057]
Next, the voice coil 3 with the terminal flange 7 is pulled out from the assembly jig J1 and
mounted on the back surface 1b of the screen 1, but as shown in FIG. It is written. ) Was attached
to the screen 1 at a predetermined position. As shown in FIG. 17, the VC bonding jig J2 has a
shape in which poles protrude from the front and back surfaces of a disk having a thickness of
approximately 12.5 mm and a diameter of 95.8 mm, and the pole portion protruding to the
upper surface of the disk is The handle for holding the jig, 24 mm in diameter and 20.5 mm in
height.
[0058]
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16
Furthermore, the central pole portion provided on the lower surface side of the disk is the voice
coil 3 insertion portion, and the diameter is 30.36 mm and the height 11.5 mm. Furthermore, the
concentricity with the pole portion is maintained, and the outer peripheral portion of the disc is
cut at a height of 6 mm and a diameter of 85 mm as illustrated. As shown in the figure on the
screen 1 mounting surface side of the flange 7 of the voice coil 3, while mixing the twocomponent mixing type acrylic adhesive bo, it is applied uniformly and in a cord shape in an
amount of about 0.48 g Then, it was installed in the voice coil 3 insertion portion of the VC
bonding jig J2, and further, the jig J2 was inserted into the magnetic circuit 4 mounting housing
4H mounted on the back plate 22 of the circuit housing 2.
[0059]
The magnetic circuit 4 mounting housing 4H is made of aluminum, has a generally concave
shape, and has a cross-sectional shape as shown in FIG. 17. The bottom portion shown in FIG. 17
is provided with a hole of 85.02 mm in diameter. The diameter of the hole is referred to as a
positioning guide (hereinafter referred to as a guide hole 4H1). )となっている。 Therefore, the
85 mm diameter portion of the VC bonding jig J2 in which the voice coil 3 with the terminal
flange 7 is installed is inserted into the guide hole, and further inserted until the outermost
periphery of the jig is caught in the guide hole. Then, the terminal flange 7 portion of the voice
coil 3 with the terminal flange 7 is in close contact with the screen back surface 1 b side.
[0060]
Further, as shown in FIGS. 16 and 19, four holes having a diameter of 24 mm are provided in the
disc portion of the VC bonding jig J2. Therefore, the state of adhesion with the terminal flange 7
and the screen 1 can be visually confirmed through the hole. For example, the adhesive bo
attached to the terminal flange 7 is closely pressed to the back surface 1b of the screen so that
the adhesive bo protrudes from the outer periphery of the terminal flange 7 or the direction of
the input terminal 8 is predetermined. It is whether or not it is in the direction.
[0061]
In the case where the adhesion state is poor, for example, when a gap is confirmed between the
adhesion surface of the screen 1 and the adhesion surface of the terminal flange 7, it is necessary
to securely press the VC adhesion jig J2, or the direction of the terminal When the VC bonding
jig J2 is inserted into the guide hole 4H1 of the magnetic circuit 4 mounting housing 4H, the
position of the input terminal 8 lug is set to a predetermined position by rotating the jig J2. It is
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possible to install in position.
[0062]
After confirming that it is in the desired adhesive state, the adhesive bo is cured and left for a
predetermined time to reach the required strength, and after confirmation of the curing of the
adhesive bo, the VC bonding jig J2 is fixed as shown in FIG. When removed, the voice coil 3 and
the terminal flange 7 are bonded to a predetermined position on the screen back surface 1b side,
that is, perpendicular to the screen back surface 1b and coaxial with the guide hole of the
magnetic circuit 4 mounting housing 4H. It is attached to.
In the case of the present embodiment, since three magnetic circuit 4 mounting housings 4H are
provided on the back surface 1b of the screen, the voice coil 3 and the terminal flange 7 are
mounted in the same manner in the remaining two places.
[0063]
In the mounted state, the leading end of the input lead wire wound on the back plate 22 is
connected and wired to the terminal lug mounted on the terminal flange 7 of the screen back
surface 1b. A terminal for connection corresponding to the terminal lug of the terminal flange 7
is attached to the tip of the lead wire for input, so when connecting and wiring the positive
terminal on the positive side and the negative terminal on the negative side, respectively, the
housing The connection wiring with the 2 side and the voice coil 3 side for driving the screen 1 is
completed. In the case of the present embodiment, the connection wiring is performed by using
the faston terminal, but the wiring by soldering may be simultaneously used. Further, in the
explanatory drawing, the wiring condition between the input lead wire and the terminal lug is
omitted because the drawing becomes complicated and difficult to understand.
[0064]
In the case of the present embodiment, as described above, the input lead wire wound on the
back plate 22 was connected directly to the terminal lug attached to the terminal flange 7 of the
screen back surface 1b. Even with the above method, it is possible to endure practical use
sufficiently, but in order to obtain more reliability, a relay terminal is provided in the magnetic
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circuit 4 mounting housing 4H or the like, and an input lead wire is connected to the relay
terminal. Furthermore, connection wiring may be made to the terminal lugs attached to the
terminal flanges 7 of the screen back surface 1b from the relay terminals using tinsel wires.
[0065]
Next, the drive magnetic circuit 4 is mounted on the magnetic circuit 4 mounting housing 4H.
Hereinafter, the drive magnetic circuit 4 will be described with reference to FIG. 20, FIG. 21 and
FIG. The magnetic circuit 4 is an external magnet type magnetic circuit 4 using a general ferrite
magnet 41, and is composed of three points of a bottom yoke 43, a magnet 41 and a top plate
42. In the case of this embodiment, the bottom yoke 43 has a bottom portion 6 mm thick and a
diameter 85 mm, and a central pole portion provided on the bottom portion 29.95 mm in
diameter and 21 mm in height.
[0066]
The magnet 41 and the top plate 42 are mounted on the bottom yoke 43. The mounting method
is generally a bonding method. The magnet 41 has a ring-shaped ferrite magnet 41 with an outer
diameter of 90 mm, an inner diameter of 45 mm and a thickness of 12 mm. The top plate 42 has
an outer diameter of 85 mm, an inner diameter of 33.48 mm, and a thickness of 6 mm. However,
it rises 3 mm from the 43 mm diameter near the inner diameter as shown in the figure. The
thickness is 5 mm from the position of 35.5 mm.
[0067]
In order to make the inner diameter of the pole portion of the bottom yoke 43 and the top plate
42 uniform at the time of bonding in the magnetic circuit 4 assembly, a jig called a gap jig is used
and the jig is used as the bottom yoke 43 In the state installed on the outer circumference and
the inner circumference of the pole part, and the adhesive bo is attached when the
predetermined strength is reached, ie, when the mutual parts constituting the magnetic circuit 4
do not move by the magnetic force Magnetization is performed with porcelain, the gap jig is
removed, and a magnetic circuit 4 for driving the screen 1 having a magnetic gap G with a width
of 1.765 mm composed of the outer periphery of the pole and the plate inner diameter is
obtained.
[0068]
The completed magnetic circuit 4 is inserted into and fitted to the magnetic circuit 4 mounting
housing 4H mounted on the back plate 22 of the housing 2. In the case of this embodiment, the
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outer circumference of the magnet 41 and the inner diameter of the magnetic circuit 4 mounting
housing 4H Since there is only a gap of about 3 mm between the parts, the insertion method is to
insert an M4 screw with a length of 30 mm to 50 mm on the screw part provided on the bottom
yoke 43 and support the screw to insert and fit As shown in the drawing, the outer periphery of
the top plate 42 of the magnetic circuit 4 was correctly installed on the inner periphery of the
guide hole of the housing 4H.
[0069]
As a matter of course, the voice coil 3 is disposed within the design tolerance of the magnetic gap
G of the magnetic circuit 4.
In the longitudinal regulation shown in FIGS. 21 and 22, the portion protruding from the magnet
41 top plate 42 is caught on the top of the guide hole, and the range of the coil 3 winding width
to the design value in the magnetic flux width of the magnetic gap G It has a structure to be
installed inside.
The ring 9 for fixing the magnetic circuit 4 is made of aluminum with a thickness of 6 mm, and
provided with eight M4 countersinks at a position of 45 mm distributed at an outer diameter of
126.6 mm, an inner diameter of 85.1 mm and a concentric diameter of 108 mm. It is
[0070]
The M4 female thread portion is also provided on the housing 4H side at a position
corresponding to the countersink of the ring 9, so when the ring 9 is fastened with a M4 15 mm
long flat head screw, the vicinity of the inner peripheral portion of the ring 9 is In order to press
the outer peripheral portion of the magnet 41 protruding from the outer peripheral portion of
the bottom yoke 43, as a result, the outer peripheral portion of the magnet 41 of the magnetic
circuit 4 is sandwiched between the housing 4H and the ring 9 to form an extremely rigid fixing
structure.
When the magnetizing path is fixed to the housing 4H by the ring 9 for fixing the magnetic
circuit 4 as shown in the drawing, the mounting of the magnetic circuit 4 for driving the voice
coil 3 to the housing 2 is completed. A direct drive screen speaker system of the overall image
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20
shown at 24 was obtained.
[0071]
In the case of the direct drive type screen speaker system of this embodiment, a signal for center
speaker is added to the drive unit disposed at the center of the screen 1 corresponding to the 5.1
channel system, and the side SP is applied to the left and right drive units. Added a signal for
Furthermore, in order to cover the sound range, side speakers were installed beside the direct
drive screen speaker system and used in combination. Since the back plate 22 of this
embodiment is mounted with a snap nut for enabling mounting of the side SP speaker, it is
possible to easily add a side speaker by using a mounting bracket, a screw or the like.
[0072]
Although the speaker system has been operated, despite the large screen, the drawback of the
sound separation from the image at the central part of the screen 1 is largely eliminated, and the
image is matched very well with the image. I was able to create a good atmosphere and get sound
quality and sound pressure that can withstand practical use.
[0073]
And, a screen is a thin plate material, and a driver including a coil for driving the screen is
mounted on the screen, and when the screen is erected, the driver is inclined by its own weight
to be in the magnetic gap. It is possible to make the thickness of the screen material much
thinner (3 to 5 times) than the screen material of the conventional example by setting the
strength to maintain the flatness of the screen so as not to touch the magnetic circuit with
Become.
This makes it possible to obtain the required sound pressure much more easily than in the prior
art, and also enables cost reduction to be facilitated.
[0074]
Moreover, since it has a cavity structure on the back side of the projection surface of the screen
1 and the end of the screen 1 is fixed to the side plate 21, the light is emitted from the screen 1
projection side and its back side. Sound does not interfere with each other, and a support 5 is
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21
provided between the back plate 22 and the screen back surface 1b, and the end of the support 5
is fixed to the back plate 22 and the screen back surface 1b. It is possible to efficiently suppress
the occurrence of abnormal resonance of the surface, and it is possible to obtain good sound
pressure and sound quality.
[0075]
This structure can be said to be a structure capable of fixing the end portion of the screen 1 and
locally suppressing a portion where the screen material is easily deformed by its own weight.
Therefore, even if the screen material is thinner, it is possible to prevent deformation due to its
own weight, and even if the driving body is installed on the screen back surface 1b side, the
weight of the driving body is optimized by optimizing the arrangement of the columns 5. It is
possible to reduce the deformation of the screen 1 by this, which increases the degree of freedom
of design, and makes it possible to reduce the cost or improve the sound quality.
[0076]
In addition, a suspension made of an elastic material, such as a cushion 6 material, is interposed
between the support 5 and the screen back surface 1b, so that the screen 1 serving as a
diaphragm has a suspension function capable of swinging. The structure is easy to swing, and it
is difficult to gradually swing as it extends to the outer side, and when the center of the flat
diaphragm is excited by an input signal, it is a structure that easily follows the movement and flat
vibration It becomes difficult for the plate specific resonance to occur.
[0077]
Further, the voice coil 3 for driving the screen 1 is mounted on the back side of the screen 1, and
the magnetic circuit 4 is mounted on the housing 2 side provided on the screen back side 1b
side, and the voice coil 3 and the magnetic circuit By having a structure that can be separated
from each other without mounting a suspension called a damper or a spider between 4 and 5, it
becomes possible to securely mount the most important screen 1 and voice coil 3, and This
structure also has the advantage that the mounting state can be confirmed visually.
Therefore, the structure of the present invention makes it possible, for the first time, to provide a
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realistic direct drive screen speaker system capable of quality assurance.
[0078]
Further, a voice coil 3 which is a driving body for driving the screen 1 is provided with a flange
portion 7 on the outer peripheral portion or the inner peripheral portion of the tip end portion of
the coil bobbin 31 and this flange portion 7 is attached to the screen back surface 1b By fixing,
the mounting strength of the voice coil 3, that is, the adhesive strength can be greatly increased,
and the tip end portion of the voice coil bobbin 31 is in direct contact with the screen back
surface 1b. Accordingly, it can be said that a structure ideal for transmitting the sound from the
coil 3 to the screen 1 is obtained, and the heat of the coil 3 is efficiently transmitted to the screen
1. That is, even if a large input is applied to the voice coil 3 to generate heat, the heat is
transmitted to the bobbin and easily dissipated from the screen 1. Therefore, it is possible to
increase resistance to a large input while obtaining good sound quality.
[0079]
The screen 1 can be obtained extremely inexpensively by being constituted of a single plate
material, in particular, a plate material made of industrial materials which is mass-produced.
Therefore, it is possible to obtain a realistic screen material and easily cope with the large screen
1. Also, despite the large area, even if a plurality of inexpensive sheets are stacked to form a
single plate material and the screen 1 is configured from this plate material, it does not matter in
any way, this method is an adjustment of sound quality, etc. It can be selected according to the
design purpose. In addition, by performing surface processing for optics on the surface side of
this screen material, it is possible to easily perform such as improvement of the reflectance of the
screen 1 and adjustment of the image quality, and it is possible to increase design freedom.
Become.
[0080]
In a direct drive screen speaker system, by using an aluminum plate with a thickness of 1 mm for
the screen 1, it is 1) basically a material with high reflectance, and 2) does not deform even if the
voice coil 3 is attached to the back surface It has strengths, 3) rapid sound propagation speed, 4)
good thermal conductivity, and 5) large-area materials that can be easily obtained materials.
[0081]
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Also, when the surface of the aluminum plate is used without any treatment, there is directivity of
reflection.
For example, when light is projected by a projector or the like, a phenomenon occurs in which
only the central portion of the screen 1 is bright and the end is dark. Assuming the use of a flat
screen material, this phenomenon is not exactly right, but the reflected light of the surface of the
aluminum plate is scattered, so that it is possible to solve the directivity of the light and scatter
the light. It is effective to give the surface the desired unevenness, so-called desired roughness, as
a means, and there are physical treatment or chemical treatment to obtain this roughness, but in
this embodiment, to obtain this roughness I chose the means to apply the chemical treatment.
[0082]
This method by chemical treatment can process a large area at once, and the distribution of
surface roughness in a large area is stable. Although the screen 1 surface obtained by this
method showed extremely good diffuse reflection and no directivity as described above was lost,
rusting occurs and the screen 1 surface is naturally uniform as a matter of course when left over
a long period of time. It disappears. In order to cope with this phenomenon, if anodizing
treatment is further performed and left for a long time, generation of rust disappears, but dust
and the like in the air adheres, and it enters fine irregularities and is completely removed even if
wiping etc. As well as being difficult, it has been found that wiping has a secondary disadvantage,
causing a serious disadvantage that the contamination on the screen 1 may further develop.
[0083]
Therefore, as in the present embodiment, after the surface of the aluminum plate is chemically
treated to obtain a predetermined roughness and further subjected to an alumite treatment,
electrodeposition coating with a clear paint (acrylic) for stain prevention results in long-term
space. Even if it is left, there is no rust, and the dirt is much less likely to adhere, and even if it
gets dirty, this dirt can be easily wiped off, and this clear paint for preventing dirt is screen 1 It
has a very stable effect on the long-term appearance protection of
[0084]
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Evaluation of the screen material by the aluminum plate revealed that it had substantially the
same performance as the commercially available high-performance screen 1, and it had both
optical (screen 1) function and acoustic (diaphragm) function. It is a suitable material for direct
drive screen speaker systems that require the ability.
In addition, the heat conduction is further improved by the effect of the alumite treatment, the
large input resistance performance is further improved, and the surface hardening action by the
alumite exerts a good effect also in the reproduction of the high range, and the sound quality of
the high range It became possible to improve.
[0085]
Further, in order to mount the voice coil 3 for driving the screen 1 at a predetermined position of
the back plate 22 disposed on the screen back surface 1b side, the guide portion for positioning
for the magnetic circuit 4 mounting housing 4H provided on the back plate 22. The voice coil 3
serving as the screen 1 driving body is mounted and fixed at a predetermined position on the
screen back surface 1b with reference to the guide portion, and the position of the magnetic
circuit 4 is set at the predetermined position corresponding to the voice coil 3 at this guide
portion. Even if the magnetic circuit 4 is repeatedly attached and detached by mounting and
optimizing the mutual position of the coil 3 and the magnetic circuit 4 gap, the position between
the voice coil 3 and the magnetic circuit 4 between the gaps. It is possible to guarantee the
reproducibility of
[0086]
Thus, this structure facilitates maintenance after assembly.
For example, it is possible to check the wiring relationship of the voice coil 3 input terminal 8
and the lead wire or repair, check the bonding condition of the terminal flange 7, or repair.
Therefore, as a product, it is possible to provide an even more realistic direct drive screen
speaker system.
[0087]
A direct drive screen speaker system in which the input terminal 8 is mounted on the screen
back surface 1b side, for example, by having the structure of the terminal flange 7, arrange the
connection wiring location far away from the voice coil 3 outer periphery The space for feeding
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power to the voice coil 3 can be wired without being on the outer periphery of the voice coil
bobbin 31, the length of the voice coil bobbin 31 can be shortened, and the propagation distance
from the coil 3 is shortened. The sound propagation efficiency is improved, which can contribute
to the realization of high sound quality.
[0088]
Further, by using a tinsel wire as a lead wire connected to the input terminal 8 and the like
provided on the terminal flange 7, it is possible to provide a more reliable direct drive type
screen speaker system.
In addition, if mounting brackets etc. are attached to the upper end, the lower end, or the lateral
end of the screen 1 part of this direct drive screen speaker system, and other loudspeaker
systems other than this direct drive screen speaker system can be arranged This makes it
possible to provide a system that further enhances the theater atmosphere, and by providing a
structure in which the other speakers can each be separated from one part of the screen, to
freely and easily select the desired sound field. Is possible.
[0089]
It is a top view of the back board of the screen speaker system concerning one embodiment of
the present invention. It is a perspective view of the back plate of the screen speaker system
concerning one embodiment of the present invention. It is a perspective view of a case of a
screen speaker system concerning a 1 embodiment of the present invention. It is a perspective
view of a case of a screen speaker system concerning a 1 embodiment of the present invention. It
is a fragmentary sectional view in the screen speaker system of FIG. It is a perspective view
which attached the magnetic circuit attachment housing to the case of the screen speaker system
concerning the 1 embodiment of the present invention. It is a fragmentary sectional view in the
screen speaker system of FIG. It is a perspective view which attached a pillar to a case of a screen
speaker system concerning a 1 embodiment of the present invention. It is the perspective view
which attached the lead for input to the case of the screen speaker system concerning the 1
embodiment of the present invention. It is the perspective view which mounted the screen in the
case of the screen speaker system concerning the 1 embodiment of the present invention. It is a
perspective view of a flange of a screen speaker system concerning one embodiment of the
present invention. It is a perspective view showing the flange and the voice coil of a screen
speaker system concerning one embodiment of the present invention. It is a perspective view of
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the drive of the screen speaker system in connection with one embodiment of the present
invention. It is a fragmentary sectional view in the screen speaker system of FIG. It is a
perspective view of the drive of the screen speaker system in connection with one embodiment of
the present invention. It is a perspective view showing the state where a drive body is attached to
a magnetic circuit attachment housing of a screen speaker system concerning one embodiment
of the present invention. It is a sectional view showing a state where a drive is attached to a
magnetic circuit mounting housing of a screen speaker system concerning one embodiment of
the present invention. It is a sectional view showing a state where a drive is attached to a
magnetic circuit mounting housing of a screen speaker system concerning one embodiment of
the present invention. It is a perspective view showing the state where a drive body is attached to
a magnetic circuit attachment housing of a screen speaker system concerning one embodiment
of the present invention. It is a perspective view of the magnetic circuit of the screen speaker
system in connection with one Embodiment of this invention. It is a perspective view explaining
the state which mounts the magnetic circuit of the screen speaker system in connection with one
embodiment of the present invention. It is sectional drawing explaining the state which mounts
the magnetic circuit of the screen speaker system in connection with one embodiment of this
invention.
FIG. 1 is a front view of a screen speaker system according to an embodiment of the present
invention. It is a rear view of the screen speaker system in connection with one embodiment of
the present invention.
[0090]
The screen speaker system of the present invention can be used in the field of home theaters as a
screen for projecting an image on a projector.
Explanation of sign
[0091]
DESCRIPTION OF SYMBOLS 1. Screen 1a, screen surface 1b, screen back surface 2, case 21, side
plate 21L, side plate length 21S, side plate short 21b, side plate flat portion 21c, side plate
groove portion 22, back plate 22h, back plate magnetic circuit attachment housing hole 22b,
back plate groove 22c, back plate thickness regulating portion 22p, back plate post attachment
counterbore 22t, back plate input terminal board attachment hole 23, middle cross 3, voice coil
31, voice coil bobbin 32, coil lead wire 4, magnetic Circuit 41, Magnet 42, Top plate 43, Bottom
Yoke 4H, Magnetic circuit mounting housing 4H1, Housing guide 5, Support 6, Support 7,
Cushion 7, Flange 8, Terminal 9, Magnetic circuit holding ring G, Magnetic gap Tb, Input terminal
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board bo, adhesive J1, jig J2, jig wi, Input lead
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