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JPS52110832

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DESCRIPTION JPS52110832
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a conventional
electrodynamic electroacoustic transducer, FIG. 2 is a cross-sectional view of the same portion,
and FIG. 3 is a diagram showing magnetic flux density in a magnetic gap, The figure shows the
integrated value of the magnetic flux density of each part in the magnetic gap and the presence
or absence of the front chamber effect, FIG. 5 is a perspective view of the electrodynamic
electroacoustic transducer in one embodiment of the present invention, and FIG. FIG. 7 is a top
view of the magnetic gap portion. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · center pole 4,4 ', 5,5', 6. Child, 15, 16 ° 17 · · · · · · · · · · pole plate, 7, 7 ', 8, 8' · · · · · ·
metal nonmagnetic plate, 9 · · · · · · · · · · · · · · · · · · · ... conductor circuit, 11; 12 ...... side plates, 13,
13 '...... lead, 14 ° 14' ...... notched groove.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic
electroacoustic transducer using a vibrating membrane 1 having a rectangular spiral conductor
provided on a PilI film. The structure of a conventional electrokinetic electric sound e converter
of this type will be described with reference to FIGS. 1, 2 and-. 2. In FIG. 1 and FIG. 2, 1 is a Cshaped yoke, 2 is a magnet provided on the bottom 91 of the bottom of the yoke 1, 3 is an f +
center pole provided on the top of the upper 11a stone 2. 7 is a magnet 1Lδ attached to the
shoulder of the yoke 1; 6 is a pole plate attached to the other end 11 of the yoke 1; @, 6Fi a
magnet 11 provided on the top of the center ball 3; @, B is the metal nonmagnetic plate added to
the end of the above-mentioned N pole plate 4, 4.6.5.6.6, and this metal nonmagnetic plate γ.
Two pairs of IB1 + + 7g are constituted by 3R, a, a and the above-mentioned II plate 4, 4.6.6.6.6.
9は? It is a dynamic film in which a rectangular spiral conductive circuit 10 is provided on an
edge film, and this vibrating film 9 is held by a pole ring t8 on a pole. 11.12Fi over yoke 1 lI! A
side plate 13.13Fi is a reet 1 connected to the end of the conductor circuit on the vibrating
membrane 9 respectively. As described above, in the above-mentioned conventional
electrokinetic 1 m electric sound mowing and burial, between magnetic pole plate 4.4 and e, olv
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and @ pole 14, es 'to e, e': magnetic gear having different direction of rca * , The magnetic circuit
of the conductor circuit 10 is disposed in each of the magnetic gears and the magnetic gear, and
when current is passed through the conductor circuit 10, current flows in opposite directions in
the two longitudinal weirs of the conductor circuit 10 Flow. For this reason, the two magnetic
gears and the vibrating film 9 in the tube vibrate in the same direction. However, in the above
conventional example, the pole plates 4 and 4.8. Because the vibration 1119 is held at Is, 8.6, the
vibration lI 9 is a magnetic gear, t's t! It is located in the central area, and for this purpose it is Styped with the hyperactivity He and the aIIIIA plate 4.6 and the metal nonmagnetic plates 7 and
II on the front face knee 1-4 MttL skin Ilb is produced by dynamic me and M @ plate 6.6 and
metallurgical value @ T, 8 and this 側 a, b occurs on the resonance side 1 front wealth effect), 璽
a, b high There is a drawback that the sound pressure characteristic has a valley at a frequency
corresponding to the height and a flat characteristic can not be obtained. In the present
invention, the electrokinetic electroacoustical transducing of the above-mentioned structuremagnetic gear in the gu ■ East W! f is examined in detail, the shadow IIt of the chamber is
removed, the sound pressure comb property is flattened, and the magnetic flux is effectively used
to improve the efficiency.
Fig. 3 shows the magnetic gears, each @A in the thickness direction of the pump. The magnetic
flux density tt in the X direction of B, C, D is shown. Here, A is the position of IIin when the
thickness of the magnetic gear, the upper end of the Eij, and the magnetic gear is 5, C is the
position of 4't, and D is the position of the center or 2't. The force applied to the magnetic gear,
vibration IIIk, placed in the magnetic gear, is proportional to the integral value of the s8 FIG. FIG.
4 shows the integral value of each position A, B, C, Dr) 114 bundle oddity and the presence of the
anterior chamber effect IIIIi. It was apparent that the forehead effect did not occur, and the force
applied to the vibrating membrane was increased. 6 to 7 show one embodiment of the present
invention, and in FIG. 6 to FIG. 7, the same parts as in FIG. 1F and the conventional i shown in
FIG. Is attached. Reference numerals 14 and 14 'denote notch grooves formed on the upper
surface portions of the opposite ends of the yoke 1, and 15.16 an i11 pole plate disposed in the
notch 1R 14 ° 14'. Ten tense i [! It is held by the electrode plates 15 and 1el and the notch
grooves 14 and 14 'of the yoke 1. 17 is also a pole plate, vibration! The central portion 119 is
held between the pole plate 17 and the upper surface of the female / terpole 3 by #I.
Incidentally, the above-mentioned vibration -9 # 'i is thick and the magnetic gear f) is arranged in
the dark. Further, in the example of the present embodiment 8, since the conductor (c) wire 10 is
provided on the lower surface of the vibrating film 9, the conductor circuit 10 is not deteriorated
by the open air. The present invention has a structure as described above, and the present
invention (the effects described below can be obtained. 6 (1) furnace chamber mJP-b: h <, and
the sound pressure characteristic is flat with a wide band of 3 KHz-1601: Hz. Since @@ bunch
can be used effectively, it is possible to achieve taaaBiIH- high-performance. (When the end aK of
the yoke is formed so as to be smaller in S 菖 6, the number of pole plates is halved in
comparison with the conventional example, the number of parts is reduced, and the assembly
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also becomes space l . When the conductor winding is provided on the lower surface of the
hyperactive membrane as shown in FIG.
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