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8. Detailed Description of the Invention In the present invention, a large number of strip-like
permanent magnets are disposed opposite to a vibrating membrane, and an electric signal is
supplied to the wiring conductor in a state where a DC flux crossing the conductor wired to the
vibrating membrane is applied. The present invention relates to a so-called full-drive electroacoustic transducer in which mechanical sound output can be obtained by supplying a vibrating
membrane. As shown in FIG. 1, the conventional electroacoustic transducer is composed of a
front permanent magnet (1), a back permanent magnet (2), a diaphragm (3), a wiring conductor
(4) and a back yoke (5). The However, according to such a configuration, the strength of the
magnetic field (hereinafter referred to as an effective magnetic field) in the direction parallel to
the vibrating membrane (3) and perpendicular to the current flowing through the wiring
conductor (4) shows the measured values in Table 1. Especially the endmost wiring conductor
(4a). (4e) is relatively large, its inner wiring conductor (4b). There is a disadvantage that the
vibration mode of the vibrating membrane (3) becomes nonuniform and distortion occurs to
cause deterioration of the frequency characteristic because the vibration mode of the vibrating
membrane (3) becomes nonuniform as it becomes relatively small in (4d) and largely varies
depending on its position. Thus, the reason why the effective magnetic field of the portions of the
wiring conductors (4a) and (4e) is relatively large and the effective magnetic field of the portions
of the wiring conductors (4b) and (4d) is relatively small is that many permanent magnets Of the
two, the external magnetic resistance seen from the magnets (2a) and (2f ') located at the
outermost position is significantly different on the side with the wiring conductors (4a) and (4e)
(inside) and 11j (outside) without the conductor It is. That is, since the reluctance EndPage: 1 is
smaller inside the magnets (2a) and (2f) than outside the magnets (2a) and (2f), much of the
magnetic flux passing through the magnets will pass through the inside. As a result, the effective
magnetic field between the magnets (2a) and (2b) and between (2e) and (2f), that is, the endmost
wiring conductors (4a) and (4e) is increased. Furthermore, due to such imbalance in the flux
balance, the magnetic flux passing through the magnets (2b) and (2e) located next to it and the
portions of the wiring conductors (4b) and (4d) can also be cut off from the wiring conductors
(4a) and (4e). ) Easy to pass through the part. As a result, the effective magnetic field of the
wiring conductors (4a) and (4e) is relatively large, and on the contrary, the present invention
solves the disadvantages of such a conventional electroacoustic transducer, and the conversion
distortion is small, It is an object of the present invention to provide an electroacoustic
transducer which has good frequency characteristics. That is, according to the present invention,
a magnetic path is formed by using a high permeability material on the outer side of the
outermost permanent magnet, and the magnetic resistances of the inner and outer sides of the
magnet are balanced, each wiring conductor The magnitude of the effective magnetic field of the
part can be made uniform.
Hereinafter, embodiments of the present invention will be described in detail with reference to
the drawings. FIG. 2 is a perspective view showing an embodiment of the present invention. In
the figure, (11) and (ii) are strip-like permanent magnets, and are fixed parallel to each other on a
flat plate (13) with high permeability (.PHI.). The permanent magnets (U) and (2) are respectively
magnetized in the directions shown in the figure. Moreover, the permanent magnets α1) and (2)
have the same polarity facing each other. The vibrating membrane (15) is disposed in parallel to
the permanent magnets α1) and (ii) at a distance from the permanent magnets α1) and (ii) by
being stretched on a frame (not shown). One conductor (16) is printed on the vibrating
membrane (g), and the wiring conductor (16) meanders so as to face the position between two
adjacent permanent magnets (11). ing. A large number of holes (5) are formed in the flat plate
(13), and the acoustic output is taken out through the holes (I7). Furthermore, according to the
present invention, a band-shaped high magnetic permeability body (powder is disposed) fixed to
the flat plates (13), (9) substantially in parallel to the outside of the permanent magnet
arrangement (11), (12). Similarly, the high permeability body Q8) may be integrally formed of
the same material as the flat plates Qa) and (14). This high magnetic permeability body (g) is for
balancing the magnetic resistance of the inside and the outside by forming a magnetic path
outside the outermost magnets (lla), (llf), (12a) and (12f). The permeability of the magnet and its
distance from the magnets (Ila), (llf), (12a), (12f) may be suitably designed to balance the
reluctance outside the magnet. Therefore, according to the present invention, by passing
magnetic flux between the outermost magnets (lla) to (12f) and the high magnetic permeability
body (18), the effective magnetic field in the wiring conductor from the end to the inner part is
made uniform. be able to. Moreover, in a state where such a magnetic field is well balanced, the
effective magnetic field can be made uniform over the entire film. Table 2 shows the effective
magnetic fields of the wiring conductor portions (16a) to (16, e) in the above embodiment
measured under the same conditions as in FIG. It is clear that it is uniform. Therefore, according
to the present invention, the vibration film (the vibration mode of the crucible is substantially
uniform, the distortion is small, and the frequency characteristic is extremely good. In the
electroacoustic transducer, the magnetic field formed between the magnets (lla), (llf), (12a) and
(12f) and the high permeability body (2) disposed outside is It can also be used as an effective
magnetic field.
This results in an increase in the effective field as well as the entire transducer, which leads to a
reduction in the amount of magnet, which is also advantageous in terms of price and weight. FIG.
8 shows another embodiment of the present invention. In the above embodiment, the magnet is
fixed on a flat plate having a large number of holes, but the magnet @) and (good) are integrally
molded as in this embodiment, and the support G! A band-shaped high permeability body) may
be provided via 3). Also in this case, it was possible to make the effective magnetic field
nonuniform by 15 or more in each conductor portion to 8 嗟 or less. Such a configuration makes
it possible to make the device binary and simplify the manufacturing process. Moreover, as a
magnet in the case of carrying out integral molding in this way, a ferrite magnet is desirable. 爾,
in the figure) is a vibrating membrane, and)) is an EndPage: two-wire conductor. As described
above, according to the present invention, by providing a high magnetic permeability body
further outside the outermost permanent magnet, the frequency characteristic of the
electroacoustic transducer can be remarkably improved with an extremely simple configuration
which only forms a magnetic path.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view showing the configuration of
a conventional electro-acoustic transducer, FIG. 2 is a diagram showing an embodiment of the
present invention, and FIG. 8 is another embodiment of the present invention. FIG. 11.12, 21, 22------permanent magnet 13. 14.-----------High permeability flat plate 15.25------- ---One vibration
film 16.26------------Wiring conductor 17--------------------------------------------------------------------------- ----------1 High permeability body (6628) Agent patent attorney Akira Tomioka (1 other person) (7).
Fig. I-Fig. 2 Fig. 3 + Caustic soda (0 labor) 待 長官 杏 1, display of the incident a; tC + 51 special H
No. 81 933 2 title of the invention 4 , Agent Tokyo Tokyo, Chiyoda-ku, Dohsemachi 1-1-6 bundle
water shortage 藺 式 会 ° 京 ° 勅 勅 部 It 出 勅 #It の の 鴫 の 鴫 の な の ロ, ロ の の EndPage :
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