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■ Electrostatic Speaker App. No. 48-1512 ■ Japanese Patent Application No. 43-17681 [Phase]
Application No. 43 (1968) March 19 @ Inventor Mitsuho Asahina Dojo Kodomo Tokyo Nerima-ku
Kita Oizumi 13680 Applicants RoE 8 Tokyo Institute of Chemistry, Chuo-ku, NihonbashiHoridome 8 1st Institute of Chemical Research, Saitama Prefecture Kita-Attachi-gun Oiwa-cho
Hirosawa 2 1 [Fa] Agent Attorney Shigeru Shibuya
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view for explaining the
structure of the speaker of the present invention, and FIG. 2 shows an example of a circuit using
the present invention.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel
electrostatic speaker that requires a DC bias power supply and does not require it. As a
conventional electrostatic speaker, a single type or a push-pull type using a plastic film on which
a metal is deposited as a polarized film as a diaphragm is used for high frequency range and full
frequency range, respectively. These all require a DC bias voltage that is considerably higher than
the signal AC voltage, and do not have a function as a speaker without it. As the DC bias voltage,
generally, a pressure cell with a pressure gauge or a @charge source with a blade is used, but in
any case it is complicated in circuit configuration and has various advantages. Nevertheless, it is
inevitable that the applications of these electrostatic speakers are limited. The electrostatic
loudspeaker according to the present invention does not require a bias power source, and
constitutes a stable electrostatic loudspeaker by using the static voltage of the plastic skin
[111111] film having chargeability as the bias voltage. An example of the configuration is shown
in FIG. A film of plastic having normal chargeability is used as the diaphragm 3, which is
sandwiched between the electrode plates 1 and 2 having a large number of holes, and a sound
AC voltage is applied through the electrode plate to extract sound from the diaphragm. It is a
thing. That is, in the present invention, although the charge of the plastic film having
chargeability is weak, when the charge is accumulated on the electrode plate, while the charge is
stably stored like a capacitor, an alternating voltage is applied. As a result, the charge of the
vibrating film is rapidly recovered, including the discharge from the electrode surface, and the
constant charge necessary as a bias source is maintained. In this case, the plastic film used for
the diaphragm is preferably as strong as possible. For example, fluoro resins such as
polyvinylidene fluoride, polyvinyl resins such as polyvinyl chloride, polyvinylidene chloride, poly
methyl methacrylate, polyester resins such as polyethylene terephthalate, polyamide resins such
as nylon 6, nylon 66, fiber derivatives such as cellulose acetate, polyacetal, etc. Polyether resin,
other polycarbonate resin, polyolefin resin and the like are used, and those showing good
acoustic conversion efficiency are polyvinylidene fluoride, polyethylene terephthalate and the
like. As an audio power source of the electrostatic type speaker using these chargeable plastic
films, as shown in FIG. 2, it may be directly from the plate circuit of the amplifier output tube or
another output from the secondary side of the output. May be supplied via
Since the present invention is configured as described above, it can be configured in a light
weight / gray volume, for example, in the shape of a curtain, and its advantages are great. The
present invention will now be described by way of examples. Example 1 Two [111111] EndPage:
1 Electrode Plate Made of a 100 mm x 100 x 3 mm True-Clad Plate with a 70-micron-thick
polyvinylidene fluoride unstretched film and circular holes 3 mm in diameter and spaced at 5
mm intervals Then, we connected the separated speakers to the output stage of the amplifier as
shown in Fig. 2 -a, and added the alternating current from the CR oscillator. Sufficient sound
pressure was obtained over 100 Hz to 13000 Hz with an AC voltage of 100 V between both
electrodes. Example 2 A metal was vapor-deposited on two polystyrene plates having the same
dimensions as the electrode plate used in Example 1 to form an electrode plate, and the
polyvinylidene fluoride film used in Example 1 was extended to a thickness of 20 microns. The
speaker was constructed by sandwiching a biaxially stretched film of polyvinylidene fluoride.
This was connected to the secondary side of the radio receiver's outgoing side as shown in FIG. 2
to receive the broadcast. Sound pressure sufficient to listen to the broadcast was obtained with
an average alternating voltage of 50 V between the electrodes. EXAMPLE 3 rl 111 111 A 18
micron thick polyethylene terephthalate film was used and continued to the radio receiver in the
same manner as in Example 2. Sufficient sound pressure was obtained with an average
alternating voltage of 50 V between the electrodes.
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