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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic block diagram showing an
example of a conventional electrodynamic speaker, FIG. 2 is a cross-sectional view of one
embodiment of the present invention, and FIG. 3 is another embodiment of the present invention.
It is a cross-sectional view of an example. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · voice coil, 7 · · · · · · · · · · · · .....
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrodynamic
speaker, and more particularly to the improvement of its structure and directivity.
Conventionally, as an electrodynamic speaker, for example, a cone-type speaker, a dome-type
speaker, a horn-type speaker and the like are known. Recently, electrodynamic loudspeakers of
different shapes and operations from general electrodynamic loudspeakers, such as ribbon
speakers and bail drivers, have also been put to practical use. The W & 1 figure is a type of
typical electrodynamic loudspeaker 082 / / 1159, a schematic configuration diagram of the airy4 ζ 一 ス ピ ー カ type speaker, the center-2 center ball 2 of the ring-shaped magnet 1 is
disposed. A flat plate portion extending from the lower end of the center ball 2 is provided in
close contact with the lower surface C of the magnet 1. Also, 3 is an upper 1i8C of the magnet 1
and a top plate placed thereon so that the inner wall of the through hole provided in the center
part of the center ball 2 is opposed to each other. A magnetic circuit 1 between the center pole 2
and the top plate 3 is a pois coil which is disposed and wound with a POUND 4Al nicoil 4B. (5) is
a frame for attaching the & part to the top play 3) and holding the periphery of the substantially
conical cone 6 at the rim surface. なお。 The neck portion at the center of the cone 6 is observed
on the bobbin 4 & C, and between the top plate 3 and the voice coil 4 I: The damper 7 can be
extended to move back and forth I: Image holding, gutter (center of the nivoice coil 4 Part C: The
center cap 8 is provided, however, this type of motion [in the case of this type speaker driving
system of the diaphragm I: the structure is therefore restricted 083 "稍 j (the vibration direction
of the two diaphragms, ie sound emission The direction is a fixed direction 1: limited, especially
C: there was a problem in directivity. This invention was made in the light of circumstances C; It
is an object of the present invention to provide an electrokinetic speaker capable of obtaining
good directional characteristics. Hereinafter, an embodiment of the present invention will be
described in detail with reference to a cross-sectional view shown in FIG. 2 with the same
reference numerals as in FIG. すなわちマグネットJ。 センターボール2、トッププレート3.
The electrodynamic magnetic drive units 241 of the voice coil 4 are disposed opposite to each
other at a predetermined interval via the frame 1 !. Then, a spindle-shaped airtight weather 12 is
disposed between the pair of magnetic parts, and both ends of the weather 120 are attached to
the tip C of the voice coil 4 respectively. The inside of the weather 12 is filled with a gas J2A
such as air or gas to give a proper elasticity. In the inner side, a plurality of annular bones 72B
are closely arranged side by side at predetermined intervals.
In such a configuration, if the signals from the outside are supplied to the voices 084 of the
magnetic circuits and the summer heat 4 from the outside and they are driven in opposite
directions, the weather 12 expands and contracts accordingly. The expansion / contraction of the
weather 12 can drive the air around it and emit sound waves. In this case, the sound wave is
emitted toward the entire circumference of the weather 12 and thus does not produce any
directivity characteristic. Furthermore, the sound impedance 7 of 7 is increased or decreased by
increasing or decreasing the pressure on the gas 12 inside the weather J2. There is a feature that
4 can be finely adjusted. In addition, one invention tf 4 y, '4 is the above-mentioned embodiment
1: ゎ, ゎ, also o ′ ′ ctte <, ζ and ζ ·. The title may be C-nidging so as to arrange the force
bone 12B in the axial direction 52 as shown in FIG. As described above in detail, the present
invention arranges a pair of electrodynamic-type magnetic drive units facing each other, and in
the meantime, I: arranges a spindle-shaped weather, and this IIIIl end according to a signal by the
1st magnetic drive unit. It drives in the opposite direction. Therefore, it is possible to provide an
electrodynamic speaker in which sound waves are emitted around the entire circumference of
the weather and good directional characteristics can be obtained. 08562, brief description 141
of the face of the chassis is a schematic block diagram showing an example of a conventional
electrodynamic speaker, FIG. 2 is a cross-sectional view of one embodiment of the present
invention, FIG. It is a heel cross-sectional factor of another embodiment. DESCRIPTION OF
SYMBOLS 1 ... Magnet, 2 ... Center pole, S ... Top plate, 4 ... Voice coil, 7 ... Dan / (-+ 11 ... flame |
frame, 12 ...% dense, xx m ... Gas, 12B ... Force bone. Applicants Attorney Attorneys Suzue
Takehiko 108C Figure 1 8.71310 cQ S 0871 Susunhito Sansui Electric Co., Ltd., Five, -4, N-.
131212A12B Figure 3 112A12B 13109% 1m- / 461 Applicants Sansui Electric Co., Ltd. & 552
now 1h-abhh o ,. ") · Field · '5. List of attached documents (1) Status certificate-1 letter (2)
specification-1 letter (3) Drawing 71 (4) Requests 2nd letter, 1 letter 6, creator of other than the
above, applicant for utility model registration, agent Agent Address Toranomon 1-chome, Minatoku, Tokyo 26-5 No. 17 Moribi i υ B Name (8461) Patent Attorney Muramatsu Matsuri Address
same institution name (6881) Patent Attorney Tsuboi 淳 臥 淳 臥 桐 槍 / ′ r 6 つ 7, 7,-
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jps57131099, description
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