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JP2003189390

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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
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DESCRIPTION JP2003189390
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
thin electromagnetic transducer having a structure in which a vibrating film on which electrical
wiring is formed is disposed along a permanent magnet plate.
[0002]
2. Description of the Related Art A thin electromagnetic transducer which can be used as a
speaker, a microphone or the like is disclosed in Japanese Patent Application Laid-Open No. 9331596, and an example of its specific structure is shown in FIG. FIG. 2 shows an application of
the electromagnetic converter to a thin speaker, and a casing CA thereof is constituted by
substantially rectangular metal plate members 1A and 1B arranged symmetrically in the vertical
direction. That is, each of the metal plate members 1A and 1B is formed into a container shape in
which the inner peripheral portion 12 is shallowly recessed except for the outer peripheral
flange 11 having a predetermined width. These metal plate members 1A and 1B are used as
container open ports. A casing CA in which a substantially rectangular gap space is formed inside
is configured by facing each other and abutting with each other at the outer peripheral flanges
11 and screwing and coupling with mounting holes 111 provided at a plurality of locations. In
addition, many ventilation holes 13 are formed in the plate surface of metal plate 1A, 1B.
[0003]
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1
In the gap space of the casing CA, the permanent magnet plate 2A, the buffer material 3A, the
vibrating membrane 4, the buffer material 3B, and the permanent magnet plate 2B are arranged
in this order from above. The electrical wiring 41 is formed by printing on the front and back
film surfaces of the vibrating film 4, and the electrical wiring 41 comes out from the feed
terminal portion 42 provided at the center of one side of the vibrating film 4 and is folded over
the entire film surface. , Return to the feeding terminal unit 42 again. The upper and lower
permanent magnet plates 2A and 2B are bonded magnets formed by mixing magnetic powder in
a resin material, and as shown in FIG. 3, N poles and S poles are alternately formed in a strip
shape on the plate surface There is. In FIG. 3, the cushioning material is not shown.
[0004]
The electrical wiring 41 on the vibrating membrane 4 extends alternately in the opposite
direction along the boundary region of the N pole and the S pole, and when an AC signal is input
to the feed terminal portion 42, the flux going from the N pole to the S pole Then, according to
Fleming's left hand rule, upward or downward force in the same direction acts on the electric
wiring 41 extending in the opposite direction according to the polarity of the AC signal to vibrate
the vibrating membrane 4 to generate a sound wave. The permanent magnet plates 2A and 2B
are provided with vent holes 21 in the boundary area that match the vent holes 13 of the metal
plates 1A and 1B, and sound waves pass through these vent holes 13 and 21 efficiently outside
the casing CA. Sent to The ventilation holes 13 and 21 also guarantee smooth vibration of the
vibrating membrane 4.
[0005]
By the way, in order to guarantee the vibration of the vibrating membrane in the casing CA, the
outer periphery of the vibrating membrane and the inner wall of the casing CA (that is, the
peripheral wall 12 of the inner peripheral portion 12 of the metal plate 1A, 1B) There is a gap of
about 1 mm between them, but the vibrating membrane 4 may move in the film surface direction
by its own weight when transporting the electromagnetic converter. When the position of the
electrical wiring 41 located immediately below along the boundary region of the permanent
magnet N pole and S pole as shown in FIG. 3 is shifted in the lateral direction of FIG. 3 by this
movement, the N pole to the S pole There is a problem that the electromagnetic conversion
efficiency is lowered because the electric wiring 41 is detached from the magnetic flux (arrow in
FIG. 3) to which the magnetic flux is directed, and the sound pressure and the sound quality of
the thin speaker are deteriorated.
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2
[0006]
Then, this invention solves such a subject, and it aims at providing the thin electromagnetic
converter which controlled the movement of the diaphragm accompanying conveyance etc. and
prevented the fall of electromagnetic conversion efficiency.
[0007]
In order to achieve the above object, according to the first aspect of the present invention, a
permanent magnet plate (2A, 2B) comprising bond magnets in which N poles and S poles are
alternately formed in a strip shape on the plate surface. And the permanent magnet plate (2A,
2B) are disposed via the buffer material (3A, 3B) to form an electrical wiring (41) extending along
the boundary region of the N pole and the S pole on the film surface In the thin electromagnetic
transducer in which the vibrating membrane (4) and the vibrating membrane (4) are disposed in
the inner space of the casing (CA), movement in the film surface direction due to its own weight
is prevented while permitting vibration movement in the direction substantially perpendicular to
the film surface. In order to achieve this, the outer peripheral edge of the vibrating membrane (4)
is connected to the casing wall (11) by the flexible connecting member (5).
[0008]
In the first aspect of the present invention, the provision of the connecting member prevents the
vibrating film from moving in the film surface direction under its own weight at the time of
transportation or the like. The position of the electrical wiring on the vibrating membrane to be
positioned does not shift, and the good electromagnetic conversion efficiency is maintained, and
the deterioration of the sound quality and the sound pressure of the thin speaker are prevented.
[0009]
In the second invention, one end of the adhesive tape (5) is attached to the outer peripheral edge
of the diaphragm (4) using the same adhesive tape (5) as the diaphragm (4) as the connection
member. Stick the end to the casing wall (11).
[0010]
In the second aspect of the invention, since the adhesive tape is of the same quality as the
vibrating membrane, the characteristic change of the vibrating membrane does not occur even if
it is installed.
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3
Moreover, both can be simply connected only by sticking on the vibrating membrane and the
outer peripheral flange.
[0011]
In addition, the code | symbol in the said parenthesis shows correspondence with the specific
means as described in embodiment mentioned later.
[0012]
DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of applying the
electromagnetic converter of the present invention to a thin speaker as described in the prior art.
FIG. 1 is a view of the metal plate 1B constituting the casing CA (FIG. 2) as viewed from the
opening side thereof, and the attachment holes 111 (FIG. 2) of the outer peripheral flange 11 are
omitted.
As described above, the permanent magnet plate 2B (FIG. 2) is attached to the bottom of the
container-like metal plate 1B, and vibration is performed via the shock absorbing material 3B
(FIG. 2) above the permanent magnet plate 2B. A membrane 4 is arranged.
The vibrating film 4 is made of a resin film such as polyester or polyimide, and the electric wiring
41 (FIG. 2) is printed on the surface as described above.
[0013]
The vibrating membrane 4 is located inside the rectangular container opening of the metal plate
1B, and a gap d of about 1 mm is formed between the outer periphery of the vibrating membrane
4 and the peripheral wall of the metal plate 1B to be substantially perpendicular to the
membrane surface. The vibration of the vibrating membrane 4 is guaranteed.
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4
Here, an example of the vertical and horizontal external dimensions G and H and the vertical and
horizontal internal dimensions X and Y of the metal plate 1 B is G = about 300 mm, H = about
200 mm, X = about 240 mm, Y = about 160 mm.
[0014]
As in the prior art, the vibrating membrane 4 is formed so as to protrude from the center of the
side 43 in a rectangular shape in which the feeding terminal portion 42 is curved in a convex
shape toward the front side of the drawing. Screws are fixed to the The central portion of the
lateral side 44 at a position opposite to the lateral side 43 is connected to the outer peripheral
flange 11 constituting the casing CA wall by the adhesive tape 5 as a flexible connection member.
More specifically, the adhesive tape 5 is made of, for example, a polyimide film of the same
quality as the vibrating membrane 4, one end of which is attached to the outer periphery of the
vibrating membrane 4 and the other end is attached to the outer peripheral flange 11. An
example of the vertical and horizontal dimensions M and N of the adhesive tape 5 is M = about
35 mm and N = about 25 mm. The vibrating film 4 is accommodated in the casing CA by abutting
and coupling the metal plate 1B to the other metal plate 1A having the permanent magnet plate
2A (FIG. 2) and the shock absorbing material 3A installed therein. Thin speaker is obtained.
[0015]
According to the present embodiment, the vibrating film 4 is connected to the outer peripheral
flange 11 at the central portion of the lateral side 43 by the feed terminal portion 42, and the
central portion of the lateral side 44 opposite to the lateral side 43 is the adhesive tape 5. Since
the diaphragm 4 is connected to the outer peripheral flange 11 by this, vibrational movement of
the vibrating membrane 4 in a direction substantially perpendicular to the membrane surface is
permitted, while the vibrating membrane 4 moves in the membrane surface direction under its
own weight It is effectively prevented. As a result, the position of the electrical wiring 41 (FIG. 3)
on the vibrating film 4 positioned immediately below along the boundary region between the N
pole and the S pole does not shift, so that good electromagnetic conversion efficiency is
maintained. The deterioration of the sound quality and the sound pressure of the thin speaker is
prevented.
[0016]
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5
The connecting member is not necessarily limited to the pressure-sensitive adhesive tape, but
since it is easy to obtain one having the same quality as the vibrating membrane, the
characteristic change of the vibrating membrane is not caused even when attached to the
vibrating membrane, and the vibrating membrane And it is excellent at the point which can
connect both simply simply by sticking on an outer periphery flange. The position of the
adhesive tape does not have to be symmetrical to the feed terminal, but it is preferable that the
feed terminal and the adhesive tape be located at positions where movement of the vibrating film
in the film surface direction can be effectively prevented. The location where the adhesive tape is
attached to the vibrating membrane is preferably a passive vibrating area where no
electromagnetic vibration force is generated, that is, a folded area of the electrical wiring on the
vibrating membrane, or the like. Also, instead of blocking movement of the vibrating film in the
film surface direction by the feed terminal portion and the adhesive tape, a plurality of adhesive
tapes may be disposed to restrict movement of the vibrating film in the film surface direction.
good.
[0017]
As described above, according to the thin electromagnetic converter of the present invention,
since the movement of the vibrating film during transport and the like can be restricted to
prevent the reduction of the electromagnetic conversion efficiency, the thin electromagnetic
converter can be a thin speaker. The sound quality and sound pressure deterioration can be
avoided when applied to
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6
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