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JPS5254418

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DESCRIPTION JPS5254418
[Sure]-28 Inventor Address, No.22, No. 22 Nagaikecho, Abeno-ku, Osaka, Patent Applicant 4,
Agent 5, List of Attached Documents [Phase] Japan Patent Office ■ JP-A 52-54418 Office
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other than the above 5] jTliJ 2nd No. 22 Nagaikecho, Obino-ku 2 Noyabu Co., Ltd. 2 壬 Procedure
correction fortune-telling 015-θ year // month Zinc i-Executive director 11 hall X Shi η n 所
place Osaka city A + r + No ward Nagaokacho No. 22 masterpiece (504) C · ー 栢 会 表 11, table
good 4 伯 1 pan 4, agent イ 1 Name of the invention: 2nd place 22 Nagaike-cho, Abeno-ku,
Osaka City 545 Osaka, Japan
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スピーカ
(4) Detailed Description of the Invention The present invention uses a film diaphragm to drive
the entire surface of a type speaker C @. Conventionally, an electrostatic speaker is well known as
a speaker for generally driving a diaphragm through a full IC, and a round electrostatic speaker
is fully driven, so a speaker with good frequency characteristics can be obtained. A speaker with
sufficient characteristics can not be obtained in terms of Repe μ, etc., and if the maximum sound
pressure level is made to be a size that allows sufficient IC to be taken, there is a drawback that
the directivity characteristics become worse. EndPage: 3 and impedance matching with a
polarized electrode or amplifier applied in series between both It poles of an electrostatic speaker
is disadvantageous as it is disadvantageous as compared to the mw speaker. The Furthermore, in
the full-drive electrodynamic speaker, there is a single type of metal foil as a vibrating film or a
bon-type speaker. Since this is a full drive type, excellent properties can be obtained, but since a
very thin metal foil of about θμ is used, it is often damaged immediately by careless handling
and the impedance is 0. Since it is very low at 7 Ω or less, the coupling with the amplifier
requires a matching transformer, resulting in a cost increase. The present invention seeks to
provide a novel loudspeaker which eliminates the above-mentioned drawbacks. An embodiment
of the present invention will be described below with reference to the drawings. FIG. 7 is a plan
view of the vibrating membrane film used in the present invention, and considering the heat
generation from the conductor part due to the structure of the vibrating membrane film /
polymer film, the polyimide film is optimum in terms of heat resistance. is there. The film
thickness used is that of / μμ thickness. A conductor part is formed on this film, and the
conductor part is attached with an aluminum foil of J074 thickness by etching. The circle in FIG.
1 in FIG. : As shown in an enlarged manner, a 70-turn spiral or quadruple-shaped pattern is
formed with a line width a of 77 jμ and an interval of 41 j at 7 jμ. In this case, since the
conductor portion 2 is pasted on the film / top, it is very mechanically strong compared to the
ribbon type. JJ is each terminal. The third fork and the fourth block respectively indicate
components constituting the magnetic circuit and the arrangement relationship thereof. FIG. 3 is
a plan view of a plate on which a ffRaaJ film having a conductor is formed. The plate 4 has a
thick portion 4θ facing the ferrite magnet 7, a wall 4 / a, a bow and a conductor And an opening
q opposite to 2. The thickness of the thin portion 4 / of the plate 4 is very effective if the
thickness of the magnet 7 is set to "lo" "/ io so that the magnetic flux density in the vicinity of the
dark surface of the plate 4 and PoA / increases. When the thickness of the magnet 7 is / j 鱈, the
thick part 4θ of the plate 4 is jH and the thin part q / is / Ill, ie, /// j.
In this case, the magnetic flux density in the air gap between the plate 4 and the ball is about
100θ gauss. FIG. 4 is a cross-sectional view of the speaker, showing the tR moving film / having
the conductor pattern shown in FIG. 1 directly to the thin portion l / of the plate 4 of the
magnetic circuit or through a material such as a thin felt band. Install. If the t flow I flows in the
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conductor portion as shown in FIG. 7, the current flows in the direction of (1) and (2) in the
conductor in FIG. It is assumed that current flows from top to bottom perpendicularly to the
paper surface, and 2 indicates the reverse. If the direction of magnetization of the magnet is the
direction of the arrow (downward), then the diaphragm / film will move upward in this case. On
the other hand, when the direction of reflux is reversed, vibration 11! i! / Will move
downward. Thus, it can be seen that C * 1tht + i vibrates in accordance with the direction of the
input current. FIG. 5 shows the frequency characteristics of the loudspeaker of the present
invention. The characteristics are flat and have sufficient characteristics as a tweeter speaker. If
the width of the vibrating membrane film / conductor part J is 775μ, the thickness is 2θμ, and
the length is /, 2m, the impedance is about rΩ and it can be directly driven without a matching
transformer. The speaker can be obtained inexpensively with a very simple structure.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a diaphragm of an embodiment
of the speaker according to the present invention, FIG. 2 is an enlarged view of an essential part
of the circled portion in FIG. Is a plate used for the same speaker, @ 4 is a cross-sectional view of
the same speaker, and $ j is a frequency characteristic curve of the same speaker. In the figure, /:
vibrating membrane, conductive conductor portion, 3: terminal, 4 nibble, 5: yoke, 4: pole, 7:
magnet, pole: felt. Agent Patent Attorney Fukushi Ai; 4
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