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Patent office director Mr. M Ming's “name”; “Denkeon-Hankanki electro-acoustic transducer
inventor + L + Su + S + I + Sagarataf Hiko Ic 6 Aihara Takesan (one other person) 6” patent
applicant address 1-11 No. 2 stock meeting 1 Hitachi, Ltd. Telephone Tokyo 270-2111 (Major
representative), -5, Name () 837) Patent attorney thin 1) interest! "-Station 5 ;, '' 296 ■ Japan
Patent Office ■ JP 52-276270 published Japan 52. (1977) 3.2 ■ Japanese Patent Application
No. 0-/ / 2/2 / g Office serial number Description of the invention Name of the invention
electroacoustic transducer Conductor inside the diaphragm with curvature R! -Having a gnett, the
opposing poles are made the same, and a ball bee between these five via a bowl-shaped pole
piece. And create a magnetic field in the direction of contact with the curvature R approximately.
A full-drive electrodynamic electroacoustic transducer that causes the body to conduct current in
a direction perpendicular to the magnetic field, and cause the diaphragm to move back and forth
in a direction through the center of curvature R. 10
Detailed Description of the Invention The present invention relates to the structure of the
magnetic circuit of the electric noise # converter. In particular, the magnetism of the
electroacoustic transducer of the full drive electrodynamic type. It relates to the air circuit. In
recent years, there have been 15 technological innovations in acoustic m instruments, and in
addition to the pursuit of circuits and mechanisms, they are limited to materials. The eye is
turned on and high performance is coming from mine. . Especially the main speakers such as
conventional speakers, Hendofon. Fig. 1 shows the dynamic electric noise converter that has
been flowing. As shown, the voice source 分離, which is a driving source, and the diaphragm 2,
which is a sound source and a 1 源 source, are separated. Because of the movement, the
movement of the voice coil and the movement of the diaphragm do not necessarily coincide with
each other, and the generation of the separated vibration harmonic distortion and the
deterioration of the fullness ratio O are easily caused. The applicants of the present invention, as
an improvement method thereof, as shown in FIG. It has a Gness 5 and the opposite M1 pole is
made equal. A mail piece 6 between these 0 and pole pieces. With a transverse magnetic field
between them, perpendicular to the magnetic field on the conductor. To cause the back and forth
motion ++ 1 in the diaphragm. So-called full surface drive electrodynamic electroacoustic change.
A converter was proposed earlier. However, although it has been possible to achieve
improvement in frequency characteristics, improvement in high ** distortion reduction directivity
characteristics, etc. of the above-mentioned conversion IsK in the above-mentioned conversion, it
is still perfect. It was difficult. This invention is made in view of the point which concerns on this
invention company, and proposes the 8E air acoustic transducer which was further excellent in
the local wave number directivity characteristic further than the said proposal. Hereinafter, the
present invention will be described in detail based on examples. FIG. 3 shows an embodiment of
the present invention. It is a principal part block diagram. A magnet 5 is disposed on the inner
side of a body vibration plate 4 having a conductor 3 and having a curvature R. The magnet 5
makes the opposing magnetic poles have the same polarity, and a magnetic field in the direction
of arc vc contact with a curvature R between them through the pole piece 6 & the pole piece 6 &
which has a bowl shape between them. make. With this configuration, if current is not applied to
the conductor 3 in the direction perpendicular to the magnetic field, the diaphragm 4 causes
back and forth movement in the direction passing through the center of the circle of curvature R.
Since the present invention is an electro-acoustic transducer exhibiting the above-described
operation, the output sound pressure level at a position separated by the front axis-hi f is
extremely small in level difference and excellent in directional characteristics as compared with
the conventional structure. It is
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an electro-acoustic
transducer of a conventional structure. FIG. 2 is a block diagram of a full drive electrodynamic
electroacoustic transducer, and FIG. 3 is a constitution of an electric sound pressure transducer
showing an embodiment of the present invention. 1: Pois coil, 2: Diafful, 3: Conductor, 4 =
vibration, 5 = magnet, 6; 6a: ball piece. Attorney Attorney Attorney Hakukawa Figure 17-206
Figure 3 EndPage: 2
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