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JPS56137597

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DESCRIPTION JPS56137597
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of the prior art, and FIGS. 2 and 3
are a perspective view and a side sectional view of an essential part of an embodiment of the
present invention. -5, 6 · · · Piezoelectric ceramic, 7 · · · Conductive metal foil, 8 · · · IJ-1-line, 9 · · ·
Piezoelectric bimorph, 10 · · · Buffering material, 11 · · · stylus, 12 ... Pickup case, 13 ... arm.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric
pickup which is less susceptible to horizontal tracking angle errors. Conventionally, a monaural
piezoelectric type pickup transmits the recording wobbling signal to the piezoelectric ceramic 4
through the stylus 1, the cantilever 2 and the armature rubber 3 as shown in FIG. 1, but the
linear tracking arm is generally removed. If attached to the arm and re-grown, a horizontal
tracking angle error occurs, distortion occurs, and the sound quality is degraded. This is because
the direction of the cantilever 2 and the tangential direction of the record, even if the respective
axes of 2 are attached parallel to each other in parallel with each other, to the cantilever 2 and
the piezoelectric ceramic 4. Of the record can not be accurately transmitted to the piezoelectric
ceramic 4. The present invention provides a pickup that does not cause horizontal tracking angle
errors even when mounted on a general arm. An embodiment of the present invention will be
described in detail with reference to FIGS. 2 and 3. In FIG. 2, 6 and 6 are cylindrical piezoelectric
ceramics, which are materials in which the spontaneous polarization of the single crystal is
aligned in the radial direction in advance. These cylindrical piezoelectric ceramics 5 and 6 are
joined in the same G circle via, for example, a roll-shaped conductive metal foil 7 made of
aluminum titanium and iron alloy, and the outside of the cylindrical piezoelectric ceramics 5 and
6 Lead wires 8.8 for extracting signals are connected to the inside. Thus, the piezoelectric
bimorph 9 is configured. The end opposite to the end to which the lead wire 8 of the
piezoelectric bimorph 9 is connected and the end on the opposite side (for example, a shock
absorber 1 o such as rubber is attached, a stylus for tracing a record groove at the tip of the
shock absorber 10) 11 is attached. Then, the pickup main body configured as shown in FIG. 2 is
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accommodated in the pickup case 12 provided at the tip of the arm 13 as shown in FIG.
According to the above configuration, no directional characteristic is provided since the output
signal corresponding to the displacement is applied between the lead wires 8 and 8 regardless of
the direction (or displacement of the stylus 11) from the central position. In other words, an
omnidirectional pickup can be configured, and an output voltage proportional to the
displacement from the center position can be accurately taken. For this reason, even if it is not a
linear tracking type tone arm, the horizontal tracking angle error is not dominant, and therefore
the problem of sound quality deterioration or distortion is eliminated.
In addition, since there is no cantilever, it is possible to reduce the size and weight accordingly
and to reduce the cost. 1i14
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