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JPS54153883

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DESCRIPTION JPS54153883
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are plan and sectional views showing a
conventional piezoelectric pickup, and FIGS. 3 and 4 are plan and sectional views which do not
show an embodiment of the present invention. is there. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · needle ... Damper rubber, 8 ......... Amateur rubber,
9 ... ... Output terminal plate, 10 ... ... Conductive rubber.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
pickup for extracting a recording signal by tracing on a record board, howling by a vibration loop
formed by a case of the pickup, an output terminal plate, a piezoelectric element and a cantilever.
It is intended to prevent the phenomenon. 1 and 2 show a conventional piezoelectric pickup, in
which 1 is a pickup 0 couss and 2 is a no. u- / r ': a cantilever fixed to the lower surface of the
load 32 case 1 by a screw 3, 4 a needle attached to the tip of the cantilever 3 IC, 5 held in the
case 1 by a damper rubber 6 and a holding rubber 7 Piezoelectric element 8 is an Amazon
rubber which is fixed to the tip of piezoelectric element 5 and whose lower end is in contact with
cantilever 8. 9 is an output end plate which is held by holding rubber 7 and drawn out through
groove 1 a of case 1. is there. The output terminal plate 9 is superimposed on the electrode
portion 6a at the rear end of the piezoelectric element 5 as is apparent from FIG. 1, and is held in
a state of being covered with one piece of the holding rubber 7. Therefore, the needle 4 traces a
record board, and when the cantilever 2 vibrates, this vibration is transmitted to the piezoelectric
element 5 through the Amazon rubber 8. Then, the vibration of the cantilever 2 is converted to a
hairiness signal by the piezoelectric element 5 and is transmitted to the reproduction circuit (not
shown) through the output terminal plate 9. However, in this case, the cantilever 2 is held by the
cable 3'x * vcm1h. Since the output terminal plate 9 is also integrally coupled, a vibration loop is
formed between them, and the mutual vibration of the cantilever 2 and the piezoelectric element
6 is feedbanked through the case 1 and the output terminal plate 9, howling There was a clap
between the onset of the phenomenon. The present invention provides a piezoelectric pickup
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that solves such conventional problems. An embodiment of the present invention will now be
described with reference to FIGS. 3 and 4. In FIGS. 3 and 4, parts having the same reference
numerals as in FIGS. 1 and 2 have the same functions. And 10 is a conductive rubber, and the
rear end electrode portion 6a of the piezoelectric element 5 and the front end portion of the
output terminal plate 9 are press-fitted and held at mutually separated positions of the
conductive rubber 1o 1, The output terminal plate 9 is pulled out from the outside of the case 1
in a state where the output terminal plate 9 is in point contact with the inner surface of the case
1 (small projections 16 provided). According to this configuration, the vibration 1 'of the
cantilever 2 is transmitted to the piezoelectric element 5 through the Amazonia rubber 8 and
converted into an electric signal here, as in the conventional case), and the electric comb 10
output end r plate At this time, the piezoelectric element 6 and the output terminal plate 9 are
not held in close contact pressure holding as in the prior art, but are electrically held via the
conductive rubber 10 interposed between them. Mechanically coupled.
For this reason, the vibration loop formed by the case 1, the force / lever 2, the piezoelectric
element 6, and the output terminal plate 9 is completely separated by the conductive rubber 10,
and as a result, howling as in the prior art The phenomenon hardly happens. If the output
terminal plate 9 is point-contacted with the case 1 through the small projections 1b as in this
embodiment, howling can be more effectively prevented, but in particular the small projections
1b are not provided. You can prevent howling well. As described above, in the present invention,
the piezoelectric element and the output terminal plate are attached to mutually separated
positions of the common conductive rubber, and the quantity measuring conductive rubber of
the piezoelectric element and the output terminal plate is interposed between the two. Since the
mechanical and mechanical connection is made, it is possible to obtain an immersed effect that
the vibration of the pickup can be released and the howling phenomenon can be prevented or
four spans can be formed.
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