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(4000 yen)-, Showa, H. Date Z Patent Office, Secretary General, Address Address No.22, No. 22
Nagaikecho, Abeno Ward, Osaka Name (504) Sharp Corporation Representative, Asahi Saeki 4,
Agent Address @ 545 Osaka Abeno-ku, Nagaikecho, 22nd No. 22 Sharp Corporation (1)
Description [1] [Japanese Patent Office] ■ Japanese Patent Office ■ JP-A-52-297220 (1977) 3.5
Internal reference number 1, description of invention
Omnidirectional speaker
5. Detailed Description of the Invention The present invention is suitable for use as a
nondirectional speaker, particularly for a high sound speaker (like). -Generally speaking, the
speaker is one of the characteristic factors that are not only the frequency characteristic and the
distortion characteristic but also the directivity characteristic. However, since the conventional
cone scatter speaker and horn type speaker are only the sound radiation to the front, these
directivity characteristics There is a limit to the improvement of the system due to the factors
and the structure of the speaker. The present invention is the structure of these conventional
speakers 7i! It is an attempt to provide a new nupeka bowl with non-directionality. Hereinafter,
an embodiment of the present invention will be described with reference to the drawings. FIG. 1
shows an embodiment n ′ of the omnidirectional speaker according to the present invention,
and in FIG. 1 (a), 1 is a cylindrical magnet such as a mu ferrite magnet, for example. It generates
a magnetic field. FIG. 1 ('b) shows a diaphragm 3 having a spiral conductor 2. This vibration 9J
plate 6 is wound around a magnet 1 as shown in FIG. 1 (C). A conductive voice coil pattern is
attached to the Tono polymer film · A polymer film and a very rich aluminum EndPage: 1 New
foil is laminated · After that, the etching technology removes unnecessary aluminum A method of
melting away and forming a voice coil pattern is often used. This method can form a fine
aluminum pattern on the entire surface of a very thin polymer film, so the vibrating film becomes
very light as a whole, and it also has excellent performance as a vibrating film. In the present
invention, aluminum is attached to a polymer film, such as a polyimide film, using this eradic
technology. In the case of the present invention, the conductor pattern 2 laminated with
aluminum attached to the diaphragm 3 is in the form of a spiral so that the whole wJ film always
expands radially in the radial direction by 0a according to the direction of the current as shown.
It is attached. Such a vibration 114 is wound around a magnet magnetized in the height
direction, and 1ttIL1! The magnetic field on the surface of the cylinder vibrates the vibration
vIJIII & and the spiral conductor generates fc vibration according to the current, and this
vibration occurs in a simple radial direction to obtain an omnidirectional speaker Can. FIG. 2
shows another embodiment of the present invention. As shown in FIG. 2 (a), two magnets 1a1b
magnetized in opposite directions are superimposed, and the two magnets 1 [and 1b are
overlapped with each other. The conductor pattern 2 is formed on the vibrating membrane 3 so
that a current in the opposite direction is generated. The vibrating membrane is wound around
both magnets 1a and 1b.
Above 2 pieces of magnet 1! L-1b # i Fig. 2 (As shown in Fig. 1 As a dump material to prevent
mutual friction and resonance, etc. as an example, a thin, flexible surface material such as felt is
wound around a magnet. Be The conductor pattern 2 as shown in FIG. 1 is formed on the
vibrating film 5 by the etching technique as described above. This pattern is formed so that when
the current flows from the terminal M to the terminal B, an electric current flows as indicated by
the arrow. That is, it can be seen that the current in the spreading direction flows in the upper
half of the conductor pattern 2 of the diaphragm 3 and the current in the lower half of the lower
direction flows. Therefore, a conductor pattern (indicated by 2a) having the current direction of
the diaphragm 6 directed to the right. ) Is a conductor pattern (indicated by 211) having a
current direction facing left and facing the permanent magnet 1a. The magnet and the
diaphragm are arranged so as to face the magnet; t31 t). These are also kML-M'l-the magnetic
field tH1 · anus by each magnet. Here, it is assumed that a current I flows as shown by the arrows
in FIG. 5 in the conductor pattern 2 of the vibrating film n, as shown in FIG. The current flows
from the top to the bottom perpendicular to the drawing, and the O mark the reverse. At this
time, the vibration yI & 3 is pulled toward the center of the magnet Sa61t) by the current I
flowing through the conductor pattern 2 and the magnetic field H1 @ H11. When the direction of
the current is reversed, the vibrating membrane S works to move away from the magnet ja * 'b.
Therefore, the vibrating membrane 3 moves in accordance with the direction of the current.
Conductor pattern 2 is distributed and attached to the whole vibrating membrane ・ Driving
force is applied to the whole vibrating membrane ・ The faithful Kfi moving film vibrates
according to the input current and it is extremely excellent t pull 1 nondirectional speaker t -Can
be obtained. The m4 figure shows still another embodiment of the speaker according to the
present invention. A magnetic body 6a is interposed between the magnets 1as'b magnetized in
opposite directions, and further, a magnetic body 61), 6e is polymerized, and these magnet and
magnetic body are coupled with each other by a coupling member 4. Magnet 1sL, 11) to prevent
demagnetization. 6 is a nondirectional Spicono case in which a vibrating film having the
conductor pattern of FIG. 3 is wound on the magnet arrangement structure of FIG. 4 • The
vibrating plate uses a 12 μm thick polyimide film. As shown in FIG. 3, a pattern of 20 μm thick
aluminum is deposited and formed by photoetching. The dimensions of the diaphragm are 7 off 1
m (vertical) x 21 G mm (! Conductor width of 1, 5 mm, effective length FJ7. It is DC resistance
F17 n when.
Because this resistance [resistance value is about 8a even if resistance storage of the conductor
of the invalid portion is about the same as that of the speaker of S. America] ・ Like the
conventional speaker, the amplifier "EndPage: 2 be able to. Figure 6 is a characteristic curve
diagram in the case of a casbyka 會 anechoic chamber measured in the case of a rat and the
input of ty from the sound source to the speaker is measured, and the output is measured by a
microphone at a distance of 1 m from the speaker. As can be understood also from this
characteristic, it can be used as a K7 KHts to 20 K11 ts1lta (D range W noise noise level tube
type can and C tweeter for high sound) speaker. As described above, the nondirectional speaker
of the present invention can obtain a nondirectional speaker with an extremely simple
configuration. In particular, it is effective as a tweeter speaker.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 8 (a)-(aJ is a component block diagram showing a
simple operation fIlt of the omnidirectional speaker of the present invention, and FIG. 112 (a), (b)
show another embodiment of the same speaker. 5 is a development view of the m-front knitting
wound around the speaker of FIG. 2, and FIG. 4 is a cross-sectional view of FIG. FIG. 114 is a
characteristic curve diagram of the above speaker. In the figure, chanting, chanting a, t): magnet,
2: conductor, s: vibrating membrane 4: bonding member 5: dump material 6a to 6C: magnetic
body EndPage: 3 to 6 iIA 9 Other Inventors Address 22-22, Nagaikecho, Abeno-ku, Osaka
EndPage within Sharp Corporation: 4
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