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President of the Patent Office, 'Konie-House Yukio-Fu. Dynamic microphone 5; list of attached
documents (1) specification-1-Japan Patent Office-JP 49-66125 @ published Nissho 49. (1974)
6, 26 ■ Japanese Patent Application No. 47- / 1) lr / j / · 出 @ out RX date aEff 7.097, 1) / D, 21
'unsolicited request (all three pages) Specification 1, Title of the invention.
3. Detailed Description of the Invention The present invention relates to a dynamic microphone,
which generates an electromotive force in a coil printed on a vibrating membrane itself, so that
the structure is simple and the frequency characteristic is The purpose is to obtain a good
microphone. The figure shows an embodiment of the present invention, in which 1 is a vibrating
membrane formed of plastic film, which is formed in a rare case and is formed on an annular
support 9 with five "" L tensions. Holding in the state is obtained. The support 9 is identified in
close proximity to the opening of the case-like yoke 4. They are spaced apart from each other. A
spiral coil 7 is printed on one surface of the vibrating film 10 as shown in FIG. 3 according to
°° deposition, and its exclusive end 15.14 is led out as an output terminal. A permanent
magnet 2 magnetized in the axial direction is fixed at the center of the yoke 4 and one pole of the
permanent magnet 2 is in close contact with the yoke 4 and a pole 10 is attached to the other
pole. The pole 10 is conically shaped and the tip 6 of the length is vibrating and membrane 1.
Slightly opposite to each other with a slight gap on the back face f. 6ポール。 The tip 3 of the
10 is formed in a narrow ligature shape so that the magnetic flux is distributed at a wedge
density. On the other hand, the inner peripheral edge of the pole plate 5 attached to the opening
of the yoke 4 is also formed thin, in which part 6 indicates a magnetic flux, and it is cold. It
distributes with high density near the straight line which ties with the inner periphery of, and
distributes pole 10 radially as center EndPage: 1. When sound pressure is applied in the direction
of the arrow A, the vibrating membrane 1 vibrates accordingly. FIG. 2 shows the situation, in
which a shows a rest position and a 'and' a 'show the position of maximum displacement. 6 ', 6
"indicate the center of the magnetic flux 6, and 6' indicates the magnetic east direction when the
pole 10 and the pole plate 5 are disposed close to the vibrating membrane 1, and 6" indicates
that they are separated. Indicates the magnetic flux direction of the case. When the vibrating
membrane 1 vibrates, the coil 7 printed thereon breaks the magnetic flux 6, so that a coiling
force is generated in the coil 7, which is added over the entire circumference and taken out from
the output terminal 13.14. If the center of the magnetic flux 6 is in the direction indicated by the
line 6 ', the number of conductors of the coil 7 crossing the line 6' is eight between P and 17,
while the direction indicated by 6N is When it is directed, the number is four between q and 91,
and the electromotive force is proportional to the number of the conductors, so that the center
lines 6 ′ and 6 ′ of the magnetic flux 6 are preferably as much as the vibrating membrane 1 It
is desirable to be parallel to
Therefore, it is desirable to bring the pole 10 and the pole plate 5 close to each other. In addition,
in order to make the electromotive force 1.7 generated in the coil 7 have a linear relationship
with the sound pressure as much as possible, the magnetic flux of the portion of the coil 7 near
the straight line 6 'connecting the pole 10 and the pole plate 5 So it is desirable to narrow the
width of the coil 7 on the vibrating membrane 1, ie the distance between m and n, and so that it
lies between the pole 10 and the ball bull 1-5. Fig. 4 shows an example using an annular
permanent magnet 2 ', and even in this case, the operation is not changed at all =, and in the
above embodiment, the coil 7 is a vibrating film. Although provided on only one side of 1, it may
be provided on both sides, and the inner terminals 14 may be connected to each other through
the vibrating membrane 1 and connected in series. By doing so, it is possible to double the
number of turns of the coil 7 and it is not necessary to pull out the inner terminal 14. Since the
coil is printed, there is no need to separately install a coil support and there is no need to provide
a damper or the like. Therefore, the vibration of the vibrating membrane becomes smooth 2, the
frequency characteristic improves, and the structure becomes simple.
4. Brief description of the drawings. FIG. 11 is a longitudinal sectional view of an embodiment of
the present invention, FIG. 2 is an operation explanatory view, FIG. 6 is a plan view of a vibrating
membrane, and FIG. 4 is a longitudinal sectional view of another embodiment. It is a front view.
DESCRIPTION OF SYMBOLS 1 ... Vibration film, 2, 2 '... Permanent magnet, 5 ... Pole platet, 16 ...
Magnetic flux, 7 ... Coil, 10 ... Pole coterie Tomoyuki Arashima (A port 1 figure Eight Fig. 2 End
Page: 2 Fig. 3 j: (1) Inventor's address Address: 3-12 in Moriya-cho, Kanagawa-ku, Yokohama-shi
Address in Japan Victor Co. Name Shin Miyajima (2) Agent-Address Tokyo Metropolitan Ginza 88-12 12-15 EndPage: 3
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