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■ Int-Q-[Fa] Japan Classification [Fa] Japan (. H04r17104102C343 Patent ■ High polymer pink
amplifier @ Japanese Patent Application No. 45-48759 [phase] Application No. 45 (1970) June 8
@ inventor Matsuki Sho 5 Sakizaki Minatocho 125 Nippon Columbia Co., Ltd. Kawasaki Office,
Kawasaki Office, Yoshiaki Shitoyama O Applicant Japan Columbia Ltd. 10 140 Akasaka 4 in
Minato-ku, Tokyo 14 140 agents attorney Kazukazu Yamaguchi
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1A and 1B are a perspective view and a side view,
respectively, showing an example of a pickup using a conventional diaphragm made of a polymer
material, and FIGS. 2A and 2B are polyvinyl iritin fluo according to the present invention. FIG. 3
is a perspective view and a front view showing an example of a polymer pick-up using a ride, and
FIG. 3 is a curve showing the anisotropy of polyvinyritin fluoride.20
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polymer fiber
amplifier obtained by orienting polyvinyritin fluoride (hereinafter referred to as "PVF2") in the axis direction; The pink 257 sog, which conventionally uses a polymer material as a conversion
element, is not very commercially based except for the capacitor type pink amplifier. So, for
example, in October 1969, the Pinkup announced at the 37th Annual Meeting of the Audio
Engineering Society will be new in that it uses the electret as a conversion element. As shown in
FIG. 1, this transmits the mechanical signal components carved on the record board to the two
bellows 4L and 4R through the stylus 1, the cantilever 2 and the V-shaped lever 3, where the
mechanical signal components are sounded. The acoustic signal component converted into 35
acoustic signal components is converted similarly to the electret microphone, and is constructed
in the same manner as the one described in the patent application No. 49-44641. 9カイオ。
49$(1974)10,2.。 Example 1 (3 pages in total) of the invention is a diaphragm 5L
of a polymeric material such as Teflon. In addition to 5R, it is shown that it is adapted to extract
an electrical output signal from the diaphragm. However, the one shown in FIG. 1 takes out the
electrostatic change between the Teflon diaphragms 5L and 5R and the fixed electrodes 6L and
6R disposed opposite to each other, and converts it into an electrical signal. By passing the two
greetings systems, problems remain in the collection and frequency characteristics between the
output signal and the original signal. The present invention constitutes a pick amplifier by
utilizing the piezoelectricity possessed by the polymeric material itself, which is completely
different from the case where the electret film shown in FIG. 1 is electrostatically used to
constitute a pickup. The inventors focused on the following. That is, when orientation is given to
PVF 2 and this is electretized, a large piezoelectric effect is exhibited, and the piezoelectric tensor
dij is expressed by the following equation (1). 0000 d 150000 d 2400 ························ (1) d3 and
d32 d33000 (1) where the magnitude d3 of the piezoelectric coefficient is 1.0 to 20000 C, G, S,
e, s, u A piezoelectric material having a size 2 to 3 times as large as the size dll of the
piezoelectric material of the crystal is d · 1. In the above equation (1), it is 32'd "I001. In the
present invention, the drawn electret piezoelectric film is joined to an element to form a pick
amplifier, and as shown in FIGS. 2A and 2B, the other end of the cantilever 7 attached with the
stylus 6 is fixed to the V-shaped lever 8 The cantilever 7 is designed to be pulled backward by a
member 9 such as a piano wire so that the vibration center is at the position of the substantially
V-shaped lever 8.
On the other hand, triangular end grooves 11 are formed in the fixed end block 10 along the
axial direction of the cantilever 7, and cushioning materials 12R and 12L are respectively
adhered to the side walls of the fixed L1. The above-mentioned PVF 2 films 14L and 14R on
which the electrodes 13, 13 are formed are attached. Then, both ends of the above-mentioned Vshaped lever 8 are brought into contact with one end (the left end of FIG. 2A) of the two PVF 2
films attached, and L and R signals are respectively taken out from the electrodes 13 and 13 It is
a thing. FIG. 3 is a graph showing the anisotropy of the piezoelectric coefficient of the stretched
electret piezoelectric PVF 2 film used in the present invention, where the horizontal axis is the
angle θ between the orientation axis of the stretched film and the stress direction, and the
vertical axis is the piezoelectric ratio d / d3 □ (= Cos2θ θ Isidθ) is taken. As is apparent from
FIG. 31, the piezoelectric coefficient becomes large at approximately θ-00. 22) Equity Sho 4944641 According to the present invention, it is possible to reduce the mechanical impedance as
seen from the needle tip and to reduce the mass thereof, and also to make it possible to make a
pickup with good frequency characteristics in a simple process. That's right.