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DESCRIPTION JPS5237002

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DESCRIPTION JPS5237002
(4? eC May) H "Patent Application No. 2 September 17, 1959, Secretary of the Cabinet Office
Hideo Saito, 18 ::-1. Title of the Invention 3, Inventor's Address Name: 1006 4 Patent applicant's
name and address Osaka Prefecture Kadoma city Ogata Kamon Shin 1005 Address and name of
the agent 541 Osaka Prefecture Osaka city Higashi-ku Fushimi-cho 2nd address 19 J Building
[Fa] Japan Patent Office 0 JPA 52 JP 370020 published Japan Japanese 52. (1977) 3.22
Japanese Patent Application No. 59-/ / 3 Theta 4.9 7236tst in the office serial number 17 ", 5" 9
specification L name of the invention L name of the invention pick-up
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Detailed Description of the Invention The present invention relates to a pick-up, the purpose of
which is to record as a groove on a disk-like plastic sheet as a pick-up element capable of
exhibiting high performance particularly in high frequency range and video frequency range. It is
an object of the present invention to provide a pickup capable of reproducing the stored
information with high performance. Referring to the structure shown in FIG. 1 as a conventional
example, (0) is the end of the pick-up arm, (12) is the mount, and vibration absorbers such as
rubber, plastic, soft metal etc. are used. 13) is a piezo electric power generation element which is
thin plate-like, and generates a potential difference between electrodes attached on both sides
when receiving force in the thickness direction. θ4) is a long diamond needle, which slides along
an indented groove carved on a disc. (10) is a record disc made of a disk-like flexible material,
which is the same as the one for sound use, but the shape pitch of the grooves is different, and
the recording wavelength is small (on the order of 05 μ) . This long blade is mounted on the
groove irregularities corresponding to several wavelengths, but the relative movement between
the needle and the groove causes the vertically formed edge of the oblique front (C Stress due to
deformation is generated intensively. This stress propagates m uniformly in the needle, and is
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transmitted to the piezoelectric power generation element (1 □□□) to generate a voltage
proportional to the stress. However, this propagation path is complicated, particularly due to
reflections and the like far from the tip, and the phases of the stress waves reaching the power
generation element do not necessarily coincide, and in extreme cases, they cause a drastic
difference in phase, Deteriorate the signal to noise ratio. This is mainly due to the fact that the
needle and the piezoelectric generating element coupled thereto have a finite size comparable to
the signal wavelength handled by EndPage: 1, and in particular, the stress wave is dispersed in
the conversion part. The present invention eliminates the above-mentioned drawbacks and
provides a very mass-produced inexpensive pickup with high conversion efficiency. Furthermore,
the present invention provides a method for generating high-frequency acoustic signals at a site
where vibrational stress occurs. It is based on the technical idea that it is hopeful that it is
converted to a concentrated form of electricity as close to the point as possible. Therefore, the
groove tracing needle itself is made of a single-crystal piezoresistive semiconductor material, a
current path is formed at the tip of the groove tracing needle, and high conversion efficiency is
achieved by controlling the current flowing there directly by stress. It is a gain. The configuration
will be described below according to the embodiment shown in the drawings. In FIG. 2, (1) is a
long sword or conical needle, and its tip is processed to have a radius of 2 to 3 μ or less.
This needle is, for example, formed by processing a silicon single crystal into a desired shape and
further polishing the tip end portion, and in the case of normal P-type silicon, it is desirable that
the central axis be a (111) axis. The specific resistance of this material is selected to be relatively
high such as several tens of ohms-senna meter or more. However, the material of the type
opposite to the impurity introduced into the diffusion resistance layer described later may be
used. For example, when the diffusion resistance layer is a P-type diffusion layer, the material of
the needle is N-type. (2) is a silicon dioxide layer formed on the surface of the needle (1) by a
method such as thermal oxidation, and serves the purpose as an insulating layer between the
protection of the surface of the needle and the metal electrode layer described later . C'3) is a
metal electrode layer, and a material such as nickel, gold, or aluminum is used and is connected
to a diffusion resistance layer (5) formed at the tip. (4) is a coating of a hard thin film made of a
material such as silicon carbide applied to the entire tip of the needle and has a thickness of 10
microns or less, and is formed by a method such as high frequency sputtering. When the material
of the needle is silicon, the wear resistance as the needle is significantly lower than that of
diamond, so a hard thin film is formed to protect it. (5) is a diffusion resistance layer having a
high impurity concentration and formed at the tip of the needle with its area limited, and, for
example, in the case of P type, boron is introduced by a thermal diffusion method. Since the
present invention is configured as described above, the current flowing in the diffusion resistance
layer 5) takes a complicated route due to its shape, and the stress received at the tip is also
dispersed, and the axial direction is also strictly strict. Is not uniform, but the overall resistance
value is modulated in proportion to the stress due to the piezoresistive effect of the material,
causing a voltage change between the two electrodes of this needle in response to the load.
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Silicon materials are inexpensive and easy to process, and as described above, techniques
suitable for mass production including so-called photoetching techniques are used to form a
diffusion resistance layer, an electrode, a coating of wear resistance, etc. It can be applied and
inexpensively manufactured and supplied in large quantities. As described above, in the present
invention, a high-frequency acoustic signal is converted into an electrical quantity at a location
close to a local point where vibrational stress occurs, so a feature with high conversion efficiency
is recognized. The example shown in FIG. 3 is an embodiment of the present invention in which
the shape of the needle is the same as in the case of FIG. (6) is a mounting plate and terminal
plate of the needle, on which a lead circuit from the electrode of the needle is formed, and the
needle is fixed thereon. (7) shows a needle. (8) shows an electrode, (9) shows a piezoresistive
layer made by thermal diffusion, ++ 0 + ti disc-shaped information recording medium.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of the main part of the
conventional pickup, FIG. 2 is an enlarged sectional view of the main part of the pickup device of
the present invention, and FIG. · Needles · 4 · · · Coating · 5 · · · Diffusion resistance layer, agent
patent attorney Oshima-public EndPage: 2 Figure 1 Figure 11 Figure 2 Figure 3 EndPage:3
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