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JPS54123829

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DESCRIPTION JPS54123829
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional perspective view of a conventional
electrodynamic electroacoustic transducer, FIG. 2 is an exploded perspective view of a vibrating
membrane unit of the transducer, and FIG. 3 is a sectional view of the vibrating membrane unit 6
is a sectional perspective view of an electrodynamic electroacoustic transducer according to an
embodiment of the present invention, FIG. 5 is an exploded perspective view of a diaphragm unit
of the transducer, and FIG. 6 is a conventional example and the present invention FIG. 7 is a
cross-sectional front view of another embodiment of the present invention. 1 и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и vibrating membrane Unit, 21
... Frame plate, 22 ... Square hole, 23 ... Vibration film, 24 ... Voice coil, 25 ... Temple work
Material ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Damping material 29 ?
ииииииииииииииииииииииииииииииииииииииииииииииииииии 30, 30 'и и и и и и Upper plate, 31, 31' и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и center pole. Fig. 3-J "'%' llC?9t41f
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic
electroacoustic transducer that uses a vibrating membrane on which a voice coil is printed. First,
a conventional electrodynamic electroacoustic transducer of this type will be described with
reference to FIGS. 1 to 3. In the first case 1, 1 is a square cylindrical yoke, the magnet 2 is fixed
to the inner bottom (2) of the yoke 1, and the center ball 3 is further fixed to the upper surface of
the magnet 2 There is. A stepped portion 4.4 'is formed on the end face between the pair of
yokes 1 and the diaphragm unit 5 is attached to the stepped portions 4 and ?'. The above yaw 1.
The magnet 2 and the center ball 3 constitute a magnetic circuit, and a parallel magnetic gap is
formed between each end face of the yoke 1 and the center ball 3. Next, regarding the structure
of the imaging unit 5 described above, the second section 1. Explain with figure 3 ? 2 ? 1. In
FIG. 3,% 6 is a ring plate in which two parallel long and small holes 7.7 'are formed by b?, and a
net 8 is adhered to the upper surface of this ring 3 plate 6. A vibrating membrane 9 has a voice
coil 10 printed under the vibrating membrane 9 (company). The vibrating film 9 is made of, for
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example, a polyimide film having a thickness of 7.5 .mu.m, and aluminum is vapor-deposited by
about 6 .mu.m on one side of the film to form the voice coil 10 by etching. Above, the vibrating
membrane 9 is adhered to the lower surface of the upper ring plate 6. In the state where the
vibration M9 is adhered to the ring plate 6, the long portion of the voice coil 10 is located in the
long hole 7.7 'of the ring plate 6. 11.11 'is a terminal board, and grooves 12, 12', 13, 13 'are
formed on the lower surface of the terminal board 11.11'. The terminal plates 11 and 1M 'are
bonded to both end portions of the lower surface of the imaging Elf film 9 bonded to the lower
surface of the ring plate 6. Reference numerals 1j1 and 14 'denote damping members, and nets
15 and 15' are adhered to the lower surfaces of the damping members 11 and 14 '. 1f, 16 ', 17
and 17' are recesses formed at the end of the upper surface of the damping material 14 and 14 ',
respectively. The recess 16.1 (5 ', 17.17' of the damping material 14.14 'is engaged with and
bonded to the grooves 412.12', 13.13 'of the terminal plate 11.11'. . 18, 18 'are lead wires
connected to the end of the voice coil 10. The diaphragm unit 5 of the above structure is fitted
and fixed to the step portion 4.4 'of the yoke 1 as shown in FIG. 1, and each long core portion of
the voice coil 1o is in the magnetic gap of the magnetic circuit. It is located.
However, in the above-described conventional example, since the two independent damping
members 14 and IA 'are required and the soft damping members 14 and 14' are easily twisted or
rolled, the damping members IJ and 14 'are required. It is difficult to bring the vibration 19 Vc
into contact in the same contact state, and therefore, as indicated by a broken line in FIG. The
present invention eliminates the defects in productivity and characteristics of the abovedescribed conventional example, and one embodiment of the present invention will be described
below with reference to FIGS. 4 and 5. FIG. In FIGS. 4 and 5, reference numeral 20 denotes a
vibrating membrane unit, and the structure of the vibrating membrane unit 20 will be described
as -5. 521 is a frame plate in which the square holes 22 are formed, and a voice coil o24 to
which the vibrating film 23 is adhered on the lower surface of the frame plate 21 is a voice coil
printed on the lower surface of the diaphragm film 23. The long stem portion is located in the
frame plate 210 square hole 22. A braking material 25 has substantially the same shape as that
of the square hole 22 of the frame plate 21, and the damping material 26 is inserted into the
square hole 22. Reference numeral 26 denotes a net bonded to the upper surface of the frame
plate 21. The damping material 25 is held between the net 26 and the vibrating membrane 23.
27. 27 'is a terminal board, and this terminal board 27. 27' is adhered to the end of the vibrating
membrane 23 adhered to the frame 21. The reference numeral 28 denotes a damping material
similar to the damping material 25; and 29, a net bonded to the terminal plate 27.27 '. The
damping material 28 is held between the vibrating membrane 23 and the net 29. The diaphragm
unit 20 having the above-described structure is fixed to the step portion ?al of the yoke 1 as
shown in FIG. In the above embodiment, Neno) 26.29 is used, but this is a porous plate which can
pass sound waves such as punching metal and can press one surface of the damping material 25.
28. It is good if it is. Moreover, although the damping material 25.28 and the neno) 26.29 are
separately provided in the above embodiment, glass fibers etc. are flocked to the necessary parts
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of the net 26.29 by electrostatic flocking to obtain the damping material and the net. And may be
integrated. Although the above embodiment is an example of the internal magnet type, the
diaphragm unit similar to the above embodiment can be used also in the external magnet type
converter shown in FIG. , 30.30 'is an upper plate, 31.31' is a magnet, 32 is a lower plate, 33 is a
center pole, and 20 is a vibrating membrane unit. It is fixed to .4 '.
As described above, according to the present invention, it is a structure in which one braking
material is contacted in common 7) without bringing the braking material into contact with each
length + part of the voice coil independently, The second harmonic distortion can be reduced as
shown by the solid line in FIG. In the present invention, the structure is such that the damping
material is held between the porous plate and the vibrating membrane without bonding, which
has the advantage of facilitating the assembling operation. 4. Easy shelling of the drawing Fig. 1
is a cross-sectional perspective view of a conventional electrodynamic electroacoustic transducer,
Fig. 2 is an exploded perspective view of the same transducer unit, and Fig. 3 is the vibrating
membrane. 4 is a sectional perspective view of the electrodynamic electroacoustic transducer in
one embodiment of the present invention, FIG. 5 is an exploded oblique view of the diaphragm
unit of the transducer, FIG. FIG. 7 is a front view of a sound pressure frequency characteristic of a
converter according to the prior art and the present invention, and FIG. 7 'ri another embodiment
of the present invention. 1 и ?Yoke, 2 ииииииииииииииии Center ball% 4, 4 ? иииииииииииииииииииииииииииииииииииииииииииииии
Membrane diaphragm unit, 21 иии Frame plate , 22---Square hole, 23---... Vibrating film% 24---Voice N-il, 25----Damping material, 26----------- ('') '48-perforated plate> s27, 27 'иииииииии terminal
plate, 28 и и и damping material, 29-и и и и и и (net) (porous plate), SO. 30 'и и и и и и upper plate, 31. 31' и
и и и и и и и и и и и Mcnet, 32 и и и lower plate, 33 и и и center ball. Name of the agent Attorney Nakao
Toshio Nakano has 1 person Figure 1/4/4 'N / / S / name of the agent, 23F 329' 7/7 valveToshio Nakao Figure 2 according to ? ? '?7 ? u'3 = 8 Yue, 13 '? 11' 65 I '715 agent's name
123829, patent attorney Toshio Nakao L 4 or 1 evening. Figure 3 /! ??????????? 8
'n ? & 9t 4ty agent's name 123829 Vt valence Toshio Nakao Fig. 4 2425 f> 320 ? // 2 832
234' agent's name valve indicator Toshio Nakao 1 t E 9 o 4 t / + + + + + + + 9 "░ 6 () 73 7, 7 2) и
23 1 ? ? ? ? ? ? ? ? ? ? 7 ? 7 24 2 2 24 (/ / 77 ? ? ? ? 2? 2? 2-4 agent's name
12QQ 9 ', wide "1 Nakao-Male Figure 6 e + King! Chew и (?) 1 1 '05 kl K 2 k $ mkk 50 "1070"the name of the shoulders East H2 agent. . ') D' / ') Valve Toshio Nakao Figure 7 253? 2320263
o'1 / 4 Nst Z 31' 828 333 F!
29 Agent's Name 123829% Patent Attorney Nakao Ikuo 6 Inventors and Agents Other Than the
Above (1) Inventor's Address Osaka Prefecture Kadoma City Ogata Kadoma 1006 Matsushita
Electric Industrial Co., Ltd. Name-in! Five two e cedar gate (2) agent address Osaka letter Kadoma
city Oda Kadoshin address 1006 Matsushita Electric Industrial Co., Ltd. Name (6152) Patent
attorney Shigeno Shigeno, :) No ? ? 7-/ ? 3 g 2 (l
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