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JPS53149314

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DESCRIPTION JPS53149314
Name of the Invention Title of the Invention In order to attach a motion pickup film-like electrical
response element to a motion body. A means for opening and connecting the middle portions of
the membrane-like response elements to provide a plurality of the response elements with ysymmetrical deformation in one direction of movement and the other direction, and connecting
the leads of the plurality of response elements And, a motion Bic amp in which the response
element output is generated in y linear form for motion in any direction.
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motion pickup,
and more particularly to such a motion pickup wherein the vibration of a loudspeaker or the like
is big-amplified to produce an electrical output which can then be returned to the amplifier.
Although various thin film piezoelectric elements have been developed, generally, if the motion
amplitude is large, non-linear distortion is likely to occur. The present invention relates to a
configuration that significantly reduces non-linear distortion when combining film-like piezos. 1
(a) shows an example in which the present invention is applied to vibration detection of a
diaphragm of rj loudspeaker 01 is a vibration cone, 2 is a t-motion coil, 3.4 is a field coil 0 or 5 is
a damper , 6 show the peripheral supporting material. 9.10 is a piezoelectric thin film element,
for example, a piezoelectric laminate having polyvinylidene fluoride (pvdf) film stretched and #L
poles on both sides, or a piezoresistive element having a thin film such as Ge attached to a
polyamide film or the like The former 0 generates an electric charge on the surface by bending
and the like, and the latter similarly changes the resistance of the Ge film by transmission. As
shown in FIG. 1 (a) 9.10, the membranes are so symmetrical and spaced apart, one end of which
is the moving plate 1 at the other end, the other end 9 is a loudspeaker, and 10 is a pressure iEs.
pvdf [7, 8 Rose on the back of the 12 is pressure! In this case, the other electrode of the
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membrane may be 12 connected vertically as shown in EndPage: 1 as well as the common
electrode of 9.10. Of course, as shown in FIG. 1 (a), 9. lOt may be a town. The peripheral material
may be partially attached to the pickup as described above, but the whole of the peripheral
material may be formed into a flat hollow shape as shown in FIG. 1 (C1-6). If necessary, a cage is
kept in the interior of the surrounding material 6 to provide a damping effect. It can be made of
an nFi tubular cloth, a thin film plastic, etc., and cotton 1 styrofoam etc. may be inserted as the
inner member. FIG. 2 is an explanatory view of the operation characteristic of the pickup as
shown in FIG. The horizontal axis is X, that is, for example, 1 at the movement coordinates of the
stop plate 1 of FIG. i、、J。 Represents the output voltage of the electrode film 9.10.
Generally, a non-linear response as shown is shown, which is due to the strain of the film as
shown by the dotted line in FIG. 1 (b). That is, the electrode film in the original position of 9 °
10 is distorted as in 9, 10 'or 9, 10. Thus, the output of "* +" I ・ is obtained from lead 20.21 of
FIG. 1 tc +, but it can be seen that it responds in a so-linear manner as shown in FIG. 2 E0. FIG. 3
similarly shows the case of a piezoresistive film. In this case, the Ge film 16.17 on the base film
15 uses the change in resistance of the n lead 19.18 connected at the left end as an output.
16 ', 7' are made of deformed thin film. As shown in the figure, the right end of the hollow
membrane may be fully closed, but as shown in Fig. Tb), it is better to have a gap at the base of
the frame 11 or the base of the opposite grip plate 1 for better linearity. Become. The output of
FIG. 3 may be the lead 18.19, which is a neutral point of the differential amplifier plus or minus
25'l. Of course, 19.19 requires a bias current. In general, a resistance change detection circuit is
used. It is apparent that the method of mounting the imaging motion BIC amplifier film according
to the present invention can also be applied to, for example, the damper portion of FIG. FIG. 4
shows a practical example of the motion pickup of the present invention. 30 is a signal source,
31 is an amplifier, 32i-j loudspeaker, 33 is a motion big amp according to the present invention,
34 is a feedback circuit such as amplification 1 frequency change, and its output is negative
feedback to 31 manpower. Is extremely high-fidelity. In general, the present invention is
characterized in that a plurality of pieces are combined in an intermediate portion so as to
linearly move any film-like motion pickup so that deformation of each film becomes
complementary non-linear to the same displacement. Do. -Also use the micro horn, the pink up
psychoacoustic meter and others widely. The outputs of the two films may be either in series or
in parallel. It can be combined to correct for distortion.
Brief Description of the Drawings Fig. 1 ta) shows an example of a loudspeaker to which the
present invention is applied O1 · · · · · · · · · · · · · · · · · · · · Drive coils. 3.4 · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · damper. 6 ·········································· Base film. 9.10 ··········· Electric and membrane. Fig. 1 (b)
shows the details of thin film attachment O12 ········ Common electrode, '20, 2.1 ·································
Fig. 1 (C) ) Shows the peripheral support according to the invention. FIG. 2 shows a response
explanatory view of the motion big amp of the present invention. FIG. 3 shows an example in
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which the present invention is applied to a piezoresistive thin film. 15 ··· · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · Lead lead Figure 4 is the BIC amplifier of the present invention Shows the
applied loudspeaker etc. 30 ············ Signal source. 31 ············ Amplifier. 32 ·············· Loudspeaker. 33
· · · · · · · · · · · · · exercise pickup. 34 · · · · · · · · · · · · · · · · feedback circuit. 6-EndPage: 2nd translation
(Suno EndPage: 3
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