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JPS4935442

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DESCRIPTION JPS4935442
■ Polymer pick-up ■ Special lighting 45-48760 [Phase] Application Akira 45 (1970) June 8 @
Inventor Matsumoto Sho Minato Kawasaki City 125 Nippon Columbia Co., Ltd. Kawasaki Office in
the same office Yoshiaki Higashiyama Co., Ltd. @ Applicant Nippon Columbia stock 14 14
[presence] agent patent attorney Kazuhide Yamaguchi of Akasaka 4 Minato-ku, Tokyo, Inc.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view for explaining a conventional
method for cutting out a polymer pickup film, and FIG. 2 is an explanatory view showing a
method for cutting a poly-γ-methyl-glutamate stretched film used in the present invention. FIG.
3 is an explanatory view showing another method of cutting out a polyvinylidene fluoride
stretched film used in the present invention, and FIG. 4A to C are views showing various
embodiments of a cut out (punched out) film element, 5A and B are a perspective view and a
front view showing a method of attaching the two elements to the damper.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a polymer pickup
using a film formed by uniaxially stretching poly-γ-methyl-L-glutamate (hereinafter referred to
as PMG), polyvinylidene fluoride (hereinafter referred to as PvF2), etc. as an element for pickup. .
With regard to pickups using polymer materials as conversion elements in the past, pickups
which are not very commercially based except for capacitor type pickups are known, but
semiconductor elements having a piezoresistance effect are deposited on a polyimide material .
As shown in FIG. 1, a semiconductor element 2 having a π-type piezoelectric effect is deposited
on a polyimide film 1 in the direction of 45 ° with respect to a point 3 as shown in FIG. It has
the advantage that it is possible to obtain dog compliance and obtain an element rich in mass
productivity. However, this method has the disadvantage that management after deposition of
semiconductor devices is not easy. In the present invention, the pickup element is formed using
the PMG or PVF2 stretched film having the piezoelectric property of the polymer film itself
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without depositing the semiconductor element, and the displacement direction of the pickup
element with respect to the stretched film orientation axis is the stretched film It is an object of
the present invention to provide a polymer pickup characterized in that the direction of the
piezoelectric coefficient is substantially maximized. An embodiment of the present invention will
be described below with reference to FIGS. In FIG. 2, reference numeral 5 generally indicates a
substantially rectangular pickup element formed by punching (cutting out) the PMG stretched
film 6. In this case, cutting the slit 8 along the approximate center line 7 of the element width W
facilitates mounting on the damper 9 described later. Here, the piezoelectric tensor dij uses d14 =
d25, but the piezoelectric coefficient d of the PMG film is uniaxially oriented film to exhibit
anisotropy (in this case, it is assumed to be oriented in the Z-axis direction) On the other hand, it
is necessary to make the direction of 一致 coincide with the above θ, but in the equation (1), the
direction of the above displacement に 対 し is with respect to the above Z axis because It is
desirable that the winding distance be 45 °. FIG. 3 shows an element using PvF2 as a member.
In this case, the displacement ρ1 of the 45-direction signal of each of the pickups is given in the
direction of the value satisfying d = d 31 cos 2 θ + d 325 in 2 θ− ················· (2) with respect to
the direction of orientation (X axis direction) It is possible to select
Accordingly, in the equation (2), the piezoelectric coefficient d takes the maximum value d31
when θ = 0, so that the direction of the displacement 11 is preferably the same as the Z axis
[111111] EndPage: 1 direction. The element 5 shown in FIGS. 2 and 3 is substantially
rectangular and provided with a slit 8 along its center line 7. However, the shape of the slit and
the shape of the element can be selected to some extent. FIG. 4A-C is one specific example
thereof. The polymer film thus formed is bent at βζ 900 around the center line 7 as shown in
FIGS. 5A and 5B and inserted into the damper 9 or attached to the damper 9 for use as a stereo
pickup It is. According to the present invention, it is possible to easily obtain a pickup element
extremely rich in mass productivity, to obtain dog compliance, and to obtain a pickup having
excellent frequency characteristics by the structure easy to assemble.
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