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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of the configuration of a
big up used for a video display, FIG. 2 is a perspective view of a conversion element used for a
conventional big up, and FIG. FIG. 4 shows a frequency characteristic diagram, FIG. 4 shows a
perspective view of a conversion element according to the present invention, and FIG. 5 shows its
impedance versus frequency characteristic diagram. . 2
········································································································································· The conversion element of
the present invention. -1 Actual opening 48-90601 (2) 121 0 0 1-f 1 z 1 O O → f 2 1
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pick-up module
of zlM III (video de-stave layer) without reproducing a recorded voice and video signal on the
groove of a video disc, and the thickness of the t-divider. We propose a forged converter that
suppresses resonances other than direction. 1 □ Normal video disk player V This is played by
the pickup shown in FIG. 1. In the case of FIG. 1C, the top of the groove of the disk (1) on which
the high frequency comparison code is written is played 2) Trace the regenerating needle 1: f:
Move the groove 2 on the groove O released from pressure by the regenerating needle 110
pressure change via the regenerating needle Cantilever (6) Klil determined piezoelectric The
change in pressure is transmitted to the element # 1 and converted into the output at t1 electric
energy, for example, the change in voltage K ['. In this case, in order to faithfully reproduce the
recording signal of the disk (1), all perturbations i # i from the cantilever (5) become noises, and
these unnecessary vibrations 1 ′ ′ −,. , □ o there, ya. えゎえう? Between the i- \) and the
cantilever (5), there is an elastic looseness. When a piezoelectric element is used as a conversion
element in a conventional pickup, the shape thereof is processed into a rectangular
parallelepiped as shown in FIG. In FIG. 2, the symbols 1% w and t indicate the length, width, and
dimension of the element in the direction of thickness, respectively, and there is a relationship of
l> w> t between them, and their frequency characteristics are on the s-th surface. As shown, the
horizontal -17 frequency, the vertical axis 74 "" l "-yyx, 2 + J, l. The resonance characteristic
corresponding to the dimensions of lw and t appears, which causes unnecessary noise to be
picked up during passage 4 I note reproduction corresponding to the dimension of 1% of 3 of
these. The present invention is intended to effectively suppress the resonance characteristic due
to the size in the length direction and the width direction of the present invention. The
conversion element d is characterized in that it has an irregular shape in the planar direction.
Like that. As shown in FIG. 5, the conversion element in which the plane direction is configured
in an indeterminate shape disperses the resonance in the length and width directions and does
not generate resonance other than the resonance in the thickness direction as shown in FIG. -To
do. Therefore, resonances in the length and width directions are dispersed in the used frequency
band, and smooth frequency characteristics free of resonance points other than in the thickness
direction are obtained and written in order to perform good reproduction.