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JP2003259483

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2003259483
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
resin diaphragm for a speaker of a speaker used in various audio equipment and a speaker using
the same.
[0002]
2. Description of the Related Art The prior art will be described with reference to FIGS. FIG. 5 is a
half cross-sectional view of a conventional speaker, and FIG. 6 is a full cross-sectional view of an
injection molding die used for injection molding which is a general method of forming the resin
resin diaphragm for the speaker which is the main part. .
[0003]
According to the figure, reference numeral 13 is a magnetic circuit constituted by a lower plate
14 having a center pole, a ring-shaped magnet 15, and a ring-shaped upper plate 16. A frame 6
is coupled to the upper surface of the magnetic circuit 13. There is.
[0004]
Also, 7 is a voice coil, and the inner peripheral edge is coupled to the middle portion of the voice
coil 7 and the outer periphery is coupled to the frame 6 so that the lower portion is fitted into the
magnetic gap 17 of the magnetic circuit 13 without eccentricity. It is supported by the
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suspension 18.
[0005]
Reference numeral 2 denotes a resin resin diaphragm for a speaker, the outer peripheral portion
thereof is coupled to the edge 4, and the outer peripheral portion of the edge 4 is coupled to the
frame 6 together with the gasket 5. The periphery is coupled to the top of the voice coil 7.
[0006]
The reference numeral 19 denotes a dust cap coupled onto the resin diaphragm 2 for a speaker,
20 denotes lead wires at both ends of the voice coil 7, and 21 denotes a surface of the resin
diaphragm 2 for a speaker. A pair of eyelets, one end of each tinsel wire 22 and each lead wire
being soldered by the eyelet 21, and the other end of the tinsel wire 22 is fixed to the terminal
24 of the connector 23 fixed to the frame 6. It is connected by soldering.
[0007]
At least a part of the lead wire 20 is coated with an adhesive and fixed to the diaphragm 2.
[0008]
In addition, for the various bondings described above, it is the most common method to bond
using the adhesive suitable for each bonding location as well as fixing the lead wire 20 to the
diaphragm 2.
[0009]
In the speaker configured as described above, when an input signal is applied from the connector
23 through the terminal 24 and the tinsel wire 22 to the voice coil 7, the voice coil 7 is driven
according to Fleming's left-hand rule, By this driving force, the resin resin diaphragm 2 for a
speaker is vibrated to radiate a sound into the air.
[0010]
The speaker resin diaphragm 2 configured as described above will be described in further detail.
The speaker resin diaphragm is excellent in environmental resistance, and the user can see the
above-mentioned speaker (in particular, the speaker resin vibration) When it is used in a state
where the surface of the plate 2 and the dust cap 19 can be seen), it can be made more colorful
than a diaphragm made of pulp, so its use as a speaker for vehicle-mounted audio equipment is
generalized.
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2
[0011]
The process of manufacturing the above-described resin resin diaphragm 2 for a speaker will be
described with reference to the cross-sectional view of the injection mold of FIG.
[0012]
In the figure, 9 is a sprue bush, 3a is a fixed side insert, 1a is a movable side insert, 10 is a
protrusion pin, 11 is a resin diaphragm 2 for a speaker formed between the fixed side insert 3a
and the movable side insert 1a. Space for
[0013]
The resin injected from the injection molding machine passes through the sprue bush 9 and is
filled into the space 11 formed between the fixed side insert 3a and the movable side insert 1a,
and after cooling and solidifying, the mold is opened and extruded by the extruding pin 10 The
speaker diaphragm 2 is formed.
[0014]
In order to give special gloss such as gloss in a design manner, a hologram sheet (not shown) is
attached to the surface of the resin diaphragm 2 for a speaker.
[0015]
As described above, according to the conventional method for manufacturing the resin
diaphragm 2 for a speaker, the surfaces of the fixed side insert 3a and the movable side insert 1a
constituting the product portion of the injection molding die are as follows: The surface is a
smooth surface with a surface roughness of about 0.4 S, or a textured surface generally made by
embossing, and the light reflection state of the surface of the resin diaphragm 2 for a speaker
produced by these molds is a mold If the surface is a smooth surface, it has a gloss, and if the
mold surface is a textured surface, it has a matte state, and the resin resin diaphragm 2 for
speakers has an iridescent gloss, and it has a design feature When it is necessary to add a
hologram sheet to the surface of the resin resin diaphragm 2 for speakers as described above,
the weight of the resin resin diaphragm is increased and the sound pressure level of the speaker
is decreased. Challenge, hologram sheet and its paste And a problem that the sound quality
characteristic is changed by an adhesive agent for, the problem becomes an expensive speaker
resin diaphragm becomes cost increase with increasing paste manufacturing steps also had.
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[0016]
The present invention solves the above-mentioned problems, and it has an iridescent luster on
the surface without increasing the weight of the resin resin diaphragm for a speaker, and is low
in cost due to little change in sound quality characteristics. It is an object of the present invention
to provide a resin diaphragm and a speaker using the same.
[0017]
SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present
invention according to the present invention has the following constitution. The invention
according to claim 1 has dimensions of 0.7 to 2 .mu.m on at least one of the surface side and the
back side. The speaker diaphragm made of fine grooves or micro small holes with the same pitch,
and the light illuminated on this diaphragm is made by the micro grooves or micro small holes
formed on the surface of the resin product. At this time, since the grooves or minute small holes
are formed with a uniform pitch, the angle of the diffracted light becomes constant for each color
wavelength, and the color of the diffracted light changes in angle depending on the wavelength
of the light color. Is dispersed to produce iridescent luster, so that it is possible to obtain its
colorful color effect without attaching a hologram sheet, there is no increase in weight, there is
no sound pressure deterioration, and sound quality characteristics are also for other speakers
Resin diaphragm and change Less, but which allows the cost to provide a resin-made diaphragm
for inexpensive speakers.
[0018]
The invention according to claim 2 of the resin diaphragm for a speaker according to the present
invention is, in the invention according to claim 1, a fine pitch of 0.7 to 2 μm and the same pitch
on both the surface side and the back side. A groove or a minute small hole is provided, and it
becomes possible to generate iridescent gloss due to light diffraction phenomenon on both front
and back sides, and a resin diaphragm for a speaker having a design better than that of claim 1 It
is possible to provide
[0019]
The invention according to claim 3 of the resin diaphragm for a speaker of the present invention
is the one according to the invention according to claim 1 or 2, wherein the depth of the groove
or minute small hole is 0.1 μm or more, and the light It is possible to provide a resin diaphragm
for a speaker that causes the diffraction phenomenon of the above more reliably and stably.
[0020]
The invention according to claim 4 of the resin diaphragm for a speaker according to the present
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invention is, in the invention according to any one of claims 1 to 3, a metal thin film by metal
deposition or sputtering on the surface on which grooves or minute small holes are formed. The
layer is formed, and the metal thin film layer improves the surface reflectance, and causes a
strong light diffraction phenomenon, making it possible to provide a resin diaphragm for a
speaker capable of emphasizing visual impression. is there.
[0021]
The invention according to claim 5 of the speaker according to the present invention is a speaker
comprising the resin diaphragm for a speaker according to any one of claims 1 to 4, and the
resin for speaker having an iridescent gloss It is possible to provide a visually emphasized
speaker using a diaphragm made as an inexpensive speaker with less change in sound quality
characteristics.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will
be described below with reference to FIGS. 1 (a) to 4 (c).
[0023]
The same parts as those in the prior art are given the same reference numerals and their
explanations are omitted, and only different points will be explained.
[0024]
(First Embodiment) FIG. 1 (a) is a half sectional view of a speaker according to the present
invention, and FIG. 1 (b) is an enlarged schematic view for explaining the surface condition of the
resin resin diaphragm for a speaker which is the main part. FIG. 2 (a) is a schematic view of a
movable side insert which is an essential part of an injection mold for producing the resin
diaphragm for the speaker, and FIG. 2 (b) is a vibration for the speaker resin FIG. 3 is a schematic
enlarged cross-sectional view of the surface portion of the plate, FIG. 3 is a schematic view for
explaining the diffraction phenomenon of light, and the present embodiment mainly relates to
claim 1, claim 3, claim 4 and claim 5 Is described.
[0025]
According to the figure, the difference from the prior art lies in the resin resin diaphragm for the
speaker, and in the resin resin diaphragm for speaker 2a of the present embodiment, the depth
of the entire surface of the resin resin diaphragm for speaker 2a is 0 Grooves 2b having a fine
pitch of 2 μm and a pitch of 0.8 μm are formed.
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[0026]
As a result, when the resin resin diaphragm 2a for a speaker is incorporated into a speaker, when
it is illuminated by light, it becomes iridescent reflection light, and it is possible to obtain
extremely visually emphasized gloss.
[0027]
This will be described using the schematic view of the light diffraction phenomenon of FIG. 3.
The light diffraction phenomenon occurs at the corners 2c of the groove 2b on the surface of the
resin resin diaphragm 2a for the speaker, and the diffracted light Although the angle changes, at
this time, since the grooves 2b are formed with a uniform pitch, the angle of diffracted light
becomes constant for each color wavelength, and light interference does not occur, and B (blue),
G (green) ), R (red), etc., to obtain iridescent gloss.
[0028]
The angle of the diffracted light when the light illuminates the surface of the resin diaphragm 2a
for speaker is represented by θ = ArcSin (λ / P), and the angle of the diffracted light is the
wavelength λ of the light and the pitch P of the grooves. It is decided.
[0029]
Assuming that the wavelength of visible light is 400 nm to 700 nm, the groove pitch P needs to
be at least 0.7 μm or more, and in order to obtain the spectral difference of diffracted light at a
level where humans perceive differences in color, the groove pitch is at maximum It needs to be
about 2 μm or less.
[0030]
Further, in order to accurately realize the light diffraction phenomenon, the depth of the groove
is preferably 0.1 μm or more.
[0031]
The resin diaphragm 2a for a speaker resin having the groove 2b has a 0.2 μm high pitch, 0.8
μm pitch, bowl-like projections 1c at a fine pitch of 0.8 μm, and the resin diaphragm for a
speaker resin on the movable side of the injection molding die 1b It is formed at the time of
injection molding by providing in the formation part of 2a.
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[0032]
The same effect is obtained on the back surface side of the resin resin diaphragm 2a for speaker
by forming a ridge-like protrusion 3c similar to the ridge-like protrusion 1c to the fixed side
insert 3a, and it is transparent or translucent. It is also possible to produce the same effect on the
surface side if the speaker resin diaphragm 2a is formed of the above resin.
[0033]
As configured as described above, it is possible to obtain an inexpensive resin diaphragm 2a for a
speaker and a speaker using the same, which is small in weight increase and change in sound
quality characteristics.
[0034]
In the above embodiment, although a resin diaphragm for a speaker is used, the present
invention can be similarly applied to other speaker parts such as a frame made of a resin molded
product.
[0035]
In the above embodiment, although the grooves 2b are formed in the resin diaphragm 2a for the
speaker, even if minute small holes with fine pitches are formed at equal intervals, light is
dispersed due to the light diffraction phenomenon. What is necessary is just what generate |
occur | produces and can obtain iridescent reflected light.
[0036]
In addition, in order to improve the reflection efficiency on at least the surface of the resin
diaphragm 2a for speakers formed with the grooves 2b, a metal thin film to be a reflection layer
by metal deposition or sputtering of gold, silver, nickel, titanium, aluminum or copper. By
providing them, the effect of the present embodiment can be improved.
[0037]
Any metal may be used for metal deposition as long as the above effect can be obtained.
[0038]
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(Second Embodiment) A second embodiment of the present invention will be described with
reference to the schematic view of the insert 1b on the movable side and the insert 3b on the
fixed side of the injection molding mold of the other resin diaphragm for a speaker in FIG.
This embodiment mainly describes claim 2, and according to the figure, the wedge-like
projections 1c with a fine pitch of 0.2 μm in height and 0.8 μm in pitch are inserted on the
movable side of the injection mold. The same protrusion 3c is provided on the fixed side insert
3b in the portion where the resin resin diaphragm 2b is formed, and the speaker resin diaphragm
2b (not shown) is provided by injection molding.
[0039]
The effect of Embodiment 1 is achieved by forming grooves with a fine pitch of 0.2 μm in depth
and a pitch of 0.8 μm on the entire surface and the back of the resin resin diaphragm 2 b for
loudspeakers by the ridge-like projections of the nests 1 b and 3 b. In addition to the above, it is
possible to generate an iridescent gloss also on the back surface of the resin diaphragm 2b for a
speaker, and the resin diaphragm 2b for a speaker having iridescent gloss on both sides and a
speaker using the same. It can be obtained.
[0040]
As in the first embodiment, the present invention can be applied to other resin molded parts, and
the same effect can be obtained by forming a similar groove on the side of a thick molded article.
[0041]
As described above, according to the resin diaphragm for a speaker of the present invention,
compared to a conventional resin diaphragm for a speaker, it is not necessary to attach a
hologram sheet, and therefore, the weight increase and the change in sound quality
characteristics It is possible to obtain an inexpensive resin diaphragm for a speaker and a
speaker using the same.
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