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JPS5280801

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DESCRIPTION JPS5280801
Description 1, title of the invention
Pickup element
3. Detailed Description of the Invention The present invention relates to a pickup device, II #
relates to a pickup device for a video disc reproducing apparatus. The pickup element for the
video disc reproducing apparatus basically consists of a stylus and a piezoelectric material which
is a mechanical-electrical conversion element. The 0 style traces the recording groove of the
video disc, and is recorded 2 peno ' A signal is detected as mechanical vibration and applied to
the piezoelectric body. The piezoelectric body converts the movement transmitted by the stylus
into an electrical signal and outputs it. As such a pickup element, one having a force structure as
shown in FIG. 1 is conventionally known. In the figure, reference numeral 1 denotes a fly 2 made
of diamond or Sazaya, whose tip portion A is in contact with the recording groove of the disc. The
piezoelectric element 2 has electrodes 3 and 4 provided on its two main surfaces, and the slice 1
is fixed to one electrode 3 with an adhesive or the like. Reference numerals 6 and 6 denote lead
wires, and OH 2 connected to the electrodes 3 and 4 respectively has the above-mentioned
piezoelectric element 2 in the shape of a square having a side length of 乙 and having a thickness
T Is a diagram showing the relationship between OL and τ when the resonance frequency is
held at 12.8 MHz. As is apparent from the figure, in order to set the resonance frequency of the
piezoelectric body 2 to 12.5 Yh, one length and the thickness T of each are extremely small, and
among them the theory of relatively easy handling Even if EndPage: 13 beno, which fits in the
dimensional shape considered to be, for example, it becomes a cube whose side is 1 ω μm. Even
with this size, the size of the video disc is limited because the upper limit frequency of
reproduction is limited by the resonance frequency determined by the shapes of the stylus and
the piezoelectric element. In order to increase K, it is necessary to cook by raising this resonance
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frequency. Since the resonance frequency is inversely proportional to the shape and size of the
slicer Nakada, even if the size is simply further reduced to increase the resonance frequency,
adhesion of the stylus to the piezoelectric element and connection of the lead wire become
extremely difficult. The pick-up element according to the present invention was able to eliminate
such defects, which had drawbacks such as difficult to reproduce the characteristics, peeling of
the bonded part at the time of use, and lack of reliability. A stylus having a surface parallel to the
direction of relative movement between the tip for recording the recording groove of the video
disk and the video disk, the stylus being formed on the surface of the stylus Characterized in that
the first fcEE electric conductor thin film and the 1 @ 2 electrode formed on at least a part of the
piezoelectric thin film are provided. Do.
With such a configuration K, the piezoelectric body, which is a mechanical-electrical conversion
element, can be dimensionally negligible compared to a stylus, and the resonance frequency of
the pickup element is substantially determined by the shape of the stylus It will be. As a result, it
is possible to increase the area of the portion of the stylus to be bonded to the 8: current
collector, thereby facilitating the manufacturing operation, and to obtain a highly reliable pickup
device with small variations in characteristics. Hereinafter, the present invention will be
described in detail based on its embodiment. FIG. 3 shows the structure of this embodiment, in
which 1o is a stylus, the shape of which is 7], and the tip portion A is an oval for recording the
recording groove of the video disc, It has an XF-like iB with respect to the direction of relative
movement between the tip A and the video disc, on which the electrode 11. The piezoelectric thin
films 12j and 6 and the electrodes 13 are formed by being sequentially laminated by vacuum
deposition, sputtering, ion plating or the like. As a piezoelectric material for forming the
piezoelectric thin film 12, for example, Z! SoやZnS、Zn5s、CdO。 CtlB、C!
dse、AIN、LiNb0i、LITaOs、B1+gGeO2o。 The present 12τ · On, Bi
+ gPbO + w, etc. can be raised. The thickness of each of the electrodes 11.13 is sufficient if it is
0.1 to 1 μm. The thickness of the piezoelectric thin film 12 can be set to 1 to 10 μm. Therefore,
when the resonance frequency of the pickup element is determined by the stylus 1 o as a result
of 0, as a result, taking the element shown in FIG. 1 as an example, the conventional style 2 has
one side 1 ωμm1! According to the present invention, it is possible to increase the size of the
stylus up to 0 .mu.m.degree. To obtain the same resonance frequency, in contrast to the
quadrangle of degree. The fact that it is possible to increase the size of the tyrus 1 o is
particularly effective for greatly improving the workability of the production. And the electrode
11. Since it can be considered that the j36 sheet * 'is formed substantially on the same plane,
connection of the lead wire is easy. In addition, since the mechanical-electrical conversion
element consisting of the piezoelectric thin film 12 and the electrode 11.13 can be directly
adhered to the stylus, both are firmly integrated and there is no possibility of peeling or the like.
Furthermore, since the electrodes 11.13 of the pickup element can be regarded as substantially
the same plane, the pickup element can be easily attached to the support.
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As described above, in the pickup element according to the present invention, the mechanicalelectrical conversion element can be neglected regardless of its resonance frequency, so that it is
possible to widen the stylus. Become. Therefore, the production is extremely easy, and the
reproducibility of the characteristics is also improved. In addition, since the electrode and the
piezoelectric thin film can be sequentially stacked on the stylus, the mechanical strength of the
pickup element can be enhanced, and the mechanical-electrical conversion element is in the form
of a thin film. Can easily improve reliability. EndPage:27ベ7′
4. Brief description of the drawings Fig. 1 is a perspective view showing an example of a
conventional pickup device for a video disc, and Fig. 2 is a case where the resonance frequency is
constant and 9 o'clock! FIG. 3 is a perspective view showing an example of the pickup element
according to the present invention, showing the relationship between the length L and the
thickness T of one side of the E collector. DESCRIPTION OF SYMBOLS 10 ...... Styles 11, 11 ......
electrode, 12 ......... piezoelectric material thin film, 13 ......... electrode, A ..... stylus tip part, B ... An
adhesive surface such as a BEiE body thin film 12 of the stylus 1o. Name of agent Attorney
Nakao Toshio Nakao # 1 or 1 = 1 rule Super 5 He 808 Qil ∼ ~ Figure 1 Thickness 7 t μ Town
End Page: 3
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