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JPS5374418

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DESCRIPTION JPS5374418
Description 1, title of the invention
Electrokinetic electroacoustic transducer
3. Detailed Description of the Invention The present invention relates to an electrodynamic
electroacoustic transducer in which a vibrating membrane provided with a printed voice coil is
disposed in two parallel magnetic gaps. An embodiment of the present invention will be
described below with reference to FIGS. 1, 2 and 3. In FIG. 1, reference numeral 1 denotes a
rectangular yoke having opposite end surfaces facing each other, and a notch groove 2.2 'is
formed on the upper surface of the end portion of the yoke 1). Reference numeral 3 denotes a
magnet disposed and fixed in the yoke 1, and a center pole 4 whose side surfaces are inclined is
fixed to the upper surface of the magnet 3. The upper portion of the center pole 4 is located at
the center between the end faces of the yoke 1, and two parallel magnetic gaps are formed
between each end face of the yoke 1 and the center pole 4. Denoted at 5 and 5 'are regulating
plates fixed to both end surfaces of the center pole 4, and bending pieces engaging with the
magnetic gap are integrally formed on the regulating plates 5 and 5'. Reference numeral 6
denotes a diaphragm unit, which will be described with reference to FIGS. 2 and 3. In FIG. 2, 7 is
a nonmagnetic plate in which two parallel elongated holes 8 and 8 'are formed, 9 is a vibrating
membrane made of a polymer film, and on this vibrating membrane 9, a voice coil 1o is formed
by printing. It is done. The vibrating film 9 on which the voice coil 1o formed by printing is thus
formed is adhered to the back surface of the nonmagnetic plate 7. When the vibrating film 9 is
bonded to the nonmagnetic plate 7, bonding is performed so that the elongated portion of the
EndPage 1 voice coil 1 o is positioned in the elongated holes 8 and 8 of the nonmagnetic plate 7.
11i11 'is a spacer adhered to both ends of the vibrating membrane 9, and 12.12' is a lead wire
connected to both ends of the voice coil 10. FIG. 3 shows a state in which a damping material is
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attached to the vibrating membrane unit. In FIG. 4, 43.degree. 13 'is a damping material
composed of heat resistant felt, back, microglass wool with a surface cloth, etc., with the damping
material 13.13' being pulled to a certain extent, Both ends are bonded to the spacers 11.11
'respectively. When the damping material 13.13 'is attached as described above, the damping
material 13 [deg.] 13' is in contact with the vibrating membrane 9 to give a constant mechanical
resistance to the four vibrating membrane 9. As described above, the diaphragm unit 6 to which
the damping members 13 and 13 'are attached is fitted to and bonded to the notch grooves 2
and 2' of the yoke 1 shown in FIG. As apparent from the above embodiments, the present
invention is a unitized nonmagnetic plate, vibrating film, voice coil and damping material, and the
following effects can be obtained according to the present invention.
(1) Conventionally, in this type of converter, in order to support the damping material, a
punching metal or the like is fixed in the magnetic gap, and the damping material is interposed
between the punching metal and the diaphragm. When using punching metal, anti-resonance
occurs at 5 K 11 (z to 10 KHz, valleys occur in sound pressure frequency characteristics, sound
pressure frequency characteristics are not flat, and harmonic distortion, especially the second
harmonic There was a big drawback. On the other hand, since the damping material is attached
to the nonmagnetic plate without using punched metal as in the present invention, antiresonance does not occur, harmonic distortion is reduced, and flat sound pressure frequency
characteristics are obtained. Be FIG. 4 shows the sound pressure frequency characteristics of the
converter using the conventional punching metal, and FIG. 5 shows the sound pressure
frequency characteristics of the converter of the present invention. (2) Since the diaphragm,
voice coil and damping material are unitized, the diaphragm unit can be used in common by
combining various magnetic circuits having different magnetic efficiencies with the diaphragm
unit to obtain the output sound pressure. Transducers of different ranks (dB, A′V, m) are easily
obtained, which is advantageous in terms of manufacturing when manufacturing various
transducers. As described above, according to the present invention, it is advantageous in terms
of characteristics and manufacturing of the converter.
4. Brief description of the drawings FIG. 1 is an exploded perspective view of an electrodynamic
electroacoustic transducer according to an embodiment of the present invention, FIG. 2 is a
perspective view of a diaphragm unit of the transducer, and FIG. FIG. 4 is a perspective view
showing a sound pressure frequency characteristic of the conventional converter, and FIG. 6 is a
sound pressure frequency characteristic of the converter according to the present invention. 1 · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Center ball, 5t5 '· · · · · · · · · · · · · · · · · · · · · diaphragm
membrane unit Non-magnetic plate, 8.8 'long hole 9, curved diaphragm, 1 ° voice coil, 11. j1 / ..
Spacer, 12.12 '.. Lead wire, 13.13' ..... Damping material. Name of agent Attorney Nakao Toshio
has 1 person EndPage: 2 Figure 1 '4% キ% 蛙 0 蘇 禦 faction 4 禦 (C true) EndPage: 3
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