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JPS56137797

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DESCRIPTION JPS56137797
Description 1, title of the invention
Electro-acoustic transducer
3. Detailed Description of the Invention The present invention relates to the improvement of an
electrodynamic electroacoustic transducer using a diaphragm in which a coil is plated on a film
(thin sheet), and an object of the present invention is to improve efficiency and directivity.
Hereinafter, the present invention will be described in detail in comparison with the prior art.
FIG. 1 is a front view of a conventional electrodynamic electro-acoustic transducer having a voice
coil printed in a rectangular shape with an offset length, and FIGS. 2 and 3 are a cross-sectional
view taken along line A-A and B of FIG. It is -B sectional drawing. In FIG. 1 to FIG. 3, (+) is a
diaphragm, (2) is a voice coil printed on the diaphragm +11, (3) is a fixed portion which is a
folded portion of the voice coil (2) 4) movable parts of the voice coil (2), (5) a plate, (6) a center
pole, (7) a yoke, (8) a magnet, and (9) a fixed body. Play (51), center pole (6), yoke (7) and
magnet (8) constitute a magnetic circuit. The diaphragm (11 is fixed to the upper surface of the
magnetic circuit and the movable portion (4) of the voice coil (2) printed on the diaphragm (1) is
the plate (5) of the magnetic circuit and the center pole (6) It is arranged in two parallel magnetic
gaps formed by Further, the fixed portion (3) of the voice coil (2) is separated from the magnetic
gap and fixed by the fixed body (9). When sound pressure reproduction is performed by an
electroacoustic transducer having such a conventional rectangular voice coil (2), the aspect ratio
of the movable portion (4) of the voice coil (2) is wide because it is biased to one side The
directivity in a narrow horizontal plane is relatively good in the high region, but there is no sound
pressure reproduction in the solid EndPage: 1 Ube (3), which is the folded back part of the voice
coil (2). There is a disadvantage that is consumed. FIG. 4 is a front view of an electro-acoustic
transducer having a voice coil printed in a circular spiral shape in another prior art embodiment,
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and FIG. 5 is a cross-sectional view of FIG. The reference numerals of the respective parts are the
same as the reference numerals of the respective parts in FIG. 1 to FIG. The whole of the voice
coil (2) in the electroacoustic transducer shown in FIG. 4 or 5 is disposed in the magnetic gap
portion and becomes a movable portion. Although this conventional electroacoustic transducer
does not have the fixed portion (3) of the voice coil (2) like the electroacoustic transducer shown
in FIGS. 1 to 3, the conversion efficiency is good, but FIGS. 1 to 3 If it is intended to receive the
same band as the electroacoustic transducer shown in the figure, the outer diameter of the voice
coil (2) is large because of the circular shape, and the deterioration of directivity is bandwise as
shown in FIGS. There is a drawback starting from below the converter.
The present invention has been made to eliminate the above-mentioned disadvantages of the
conventional products, and will be described in detail with reference to the drawings. (3) FIG. 6 is
a front view of an electro-acoustic transducer showing an embodiment of the present invention,
and FIGS. 1 and 8 show sectional views taken along the line C-C and D-D of FIG. 6, respectively. .
The voice coil (2) is rectangular like the electroacoustic transducer shown in FIGS. 1 to 3, but the
magnetic gap of the magnetic circuit is made rectangular, and the voice coil (2 ) And the folded
portion (3) of the voice coil (2) is also movable. The electro-acoustic transducer having such a
structure improves the electro-acoustic conversion efficiency by using the whole of the voice coil
(2) including the folded portion (3 ') as a movable portion, and further, FIGS. 1 to 3 Similar to the
electro-acoustic transducer shown in Fig. 4, the directivity in a narrow horizontal plane is
relatively good up to a high frequency because the voice coil (2) has a flawed length, as shown in
Figs. 4 and 5 Less degradation than electro-acoustic transducers. Furthermore, since the folded
portion (3) of the voice coil (2) is also used as the movable portion, the directivity in the length
measuring direction is improved as compared with the electroacoustic transducer shown in FIGS.
As described above, the electro-acoustic transducer according to the present invention is
characterized in that the coil length of the coil is made to be a flaw length, and the whole is made
a movable part. Compared with the converter, the characteristics such as conversion efficiency
and directivity can be improved and the effect is large. FIGS. 9 and 10 are front views of only the
movable part of the voice coil showing another embodiment of the present invention, FIG. 9 is a
semicircle of the folded part of the voice coil, and FIG. 10 is a voice coil The whole is elliptical. In
the embodiment of the present invention shown in FIGS. 6 to 10, the portion facing the center
pole (voice coil inner peripheral portion) may be fixed or not fixed and may be used as a
diaphragm. Needless to say.
4. Brief description of the drawings FIG. 1 is a front view of a conventional electroacoustic
transducer, FIG. 2 is a sectional view taken along the line A-A of FIG. 1, and FIG. 3 is a sectional
view taken along the line B-B of FIG. Fig. 4 is a front view of another conventional electroacoustic
transducer, Fig. 5 is a central longitudinal sectional view of Fig. 4, and Fig. 6 is a front view of an
electroacoustic transducer showing one embodiment of the present invention, 6 is a sectional
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view taken along the line C-C of FIG. 6, FIG. 8 is a sectional view taken along the line D-D of FIG.
6, and FIGS. 9 and 10 are front views of only the moving parts of the voice coil showing another
embodiment of the present invention. It is. (1) is a diaphragm, (2) is a voice coil, (3) is a voice coil
fixed part, (3) is a voice coil folded back part, (4) is a voice coil movable part, (5) is a plate, (6)
Indicates a center ball, (7) indicates a yoke, (8) indicates a magnet, and (9) indicates a fixed body.
Agent Shinno-EndPage: 2 Fig. 1 笛 9 group Fig. 4 Fig. 3 = 675-Fig. Giant Figure EndPage: 3 Fig. 6
■ Fig. 8 Fig. 1 F, to cause 676-EndPage: 4
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