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JPS50156903

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DESCRIPTION JPS50156903
1. Title of the invention: Japan Patent Office 0: Japanese Patent Laid-Open No. 50-1569030
Published Japanese Patent No. 50. (1975) 12.1867 乙 723 薔 名称 名称 情報 情報 情報 情報% 範
範 範 範 − − 請求 請求 請求 記録 記録 記録 記録 記録 記録 記録 記録 記録 変 化 変 化 変 化 変
化 変 化 変 化 変 化 変 化 変 化 変 化 変 化 変 化 変 化 変 化 変 化 変 化 範The K detector is
arranged adjacent to the first detector portion and the first detector portion so as to slide while
being in pressure contact with the asperity mark 11 and the first detector portion and the second
detector element. A portion of the sensing element of the sensor 8 that can receive one of the
convex portions of the convex portion by the information recording signal of nine states
preliminarily compressed by the portion and transmit the reaction force to the pressure sensitive
element as an elastic wave And nine information recording detection element
’4’a’ftt&’jNW+□
The information recording signal is mechanically recorded in a spiral groove formed in a disc,
and the information recording medium is used for rounding recording and reproduction of an
acoustic signal as a so-called disc record. It has been widely used in practice. 9, In recent years,
practical research has been actively conducted on practical video discs that can record and
reproduce television projection signals (hereinafter, television is abbreviated as TV). As if to be
performed on the day. By the way, an acoustic door that cuts a normal disk record K, a note in a
single sound record! 4! In contrast, although the frequency band is only about several m at
most, the TV projection signal is recorded on a recording medium rotating at a practical
rotational speed because the frequency band is several MEZK. The information recording signal p
recording density is high-speed, so as the electromechanical transducer used for its reproduction
M1 '), the so-called eight-row waveform as for the disc record of the turf rice Can not be realized
by the operation form that traces the It is as follows when the above point is added and a
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supplementary explanation is added. '', '' To record on the TV recording signal disk-shaped
recording medium! If the 'V video signal is 7 M waves and the signal of one field period of the TV
video EndPage: 1 signal is recorded on two sides of the disk of the recording medium, the
recording wavelength on the recording medium is about The recording wavelength dimension
OF! K) Reproduction needle for racing ones that are faithful to the corrugation is required to have
an extremely small radius of curvature of 4 and note that such a reproduction needle is used-a
much stronger pressure than a medium In addition, since it causes K to break it, it would have
been used in the conventional record accompaniment for conventional record reproduction
according to recording medium materials known or used until now. The same operation mode as
the mechanical-electrical conversion element can not be adopted. To solve this point, in recent
years, an information recording / detecting element of pressure sensing type (hereinafter simply
referred to as a detecting element) ) Has been proposed. FIG. 1 is a view showing an example
configuration of the above-described pressure sensing type information recording / detecting
element, FIG. 1 (a) is a side view, and FIG. 1 (11) is a rear view. In FIG. 1, reference numeral 1
denotes a cantilever and is formed as a lightweight hollow body. This cantilever IK has an
electrode 5b attached via an adhesive layer 3 and a piezoelectric element 3 is fixed. It is done.
In the figure, in the figure, the mark is the adhesive layer, and the mark 6 is the Sapphire 1 ←
award detector (hereinafter also referred to simply as the detector 6). The idea gI! The portion
shown by Is is a disk of the recording medium. In the information recording / detecting element
shown in the figure, the contact surface of the lower part of the detector 6 is formed on the
recording medium disc DK, and a plurality of convex portions in the O information recording
signal formed in the recording medium disc DK In contact with the surface, and in front of the
above-mentioned detector 5KTh, a slope ■ is formed so as to form an introduction angle 0
between the recording medium disc and the recording medium disk. A rear wall k is formed at
the rear, Vh stone. The boundary between the nine contact surfaces and the rear wall is the
detection end, and when the recording medium disc moves in the direction of the arrow in the
figure, the detection end of the detection element 5 described above The information recording
signal recorded as the change of the unevenness in the groove is detected as an elastic wave by
the part of [1], and it is transmitted through the adhesive layer 4 to the piezoelectric element SK
to generate an electric signal to the electrodes 3m and 3b. In addition, the ± elastic waves are
applied to the piezoelectric element 3 via the detector 6 and the adhesive layer number K so that
the cantilever A-IK is not transmitted by the exclusive use of the adhesive layer 2. By the way, in
the pressure sensitive information recording and detecting element having the above
configuration, the contact surface formed on the bottom surface of the detecting element is a
plurality of convex portions Kt in the information recording signal in the groove of the recording
medium disc. Since the pressure is dispersed in contact with the surface of the recording medium
in such a manner that the recording medium disc will not be destroyed even if the detection
element is used at a needle pressure such as 02 grams if it falls down. The contact surface c
formed on the bottom surface of the detector 5 usually has a length in the direction of travel of
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the recording medium disc which is an angled number meter, and a length in the direction
orthogonal to the length direction of the disc. Although it is considered to be about Miku-Shinmeter, by pressing the bottom of this detector 6, many concavo-convex recordings by
information ffi f signal in the groove in the recording medium disc DK are enlarged WJ for
explanation of ol It is compressed as shown, and it is output when a large number of projections
in the uneven recording by the information recording signal escape from the portion of the
detection end company of the detector 6 as the recording medium disc advances. Is defeated. By
the way, in the conventional information recording / detecting element K> described with
reference to FIG. 1 and FIG. 2, when the N convex portions are compressed by the detector 6, one
convex portion is The reaction force received by the detecting element 5 from the recording
medium disc at the time of escaping is 4 if 9 is the needle pressure, and the force applied to the
detecting element 5 from the recording medium disc is p, p (1- The recording medium disc with
respect to the detecting element 6 when the detecting element compresses the convex part in the
concavo-convex recording by the information recording signal (or when the detecting element 6
gets on the convex part) The ratio of the reaction force to the pressure at which the detection end
part of the rear end of the detection element 6 is released when the protrusion escapes is
approximately 1 knee #, and the signal obtained is small and% is bad. There was a problem.
EndPage: 2 The present invention is designed to slide on a large number of concavo-convex
recordings K and 9 by the information recording signal recorded as a change of the concavities
and convexities on the recording medium disc and sliding while pressing against the
aforementioned concavo-convex recording. And a detector portion K1 of the O, the detector
portion KII being in contact with one another, and one of the convex portions by the information
recording signal in a state of preliminary KEE contraction by the detector portion of the O1. In
order to receive the convex portion and transmit the reaction force as an elastic wave to the
pressure sensitive sensor, there is provided a detector portion of K 9 8 to provide a 9 information
recording and detecting element, which has been described in the prior art example. The
problems are eliminated and nine specific contents will be described in detail below. FIG. 3 is an
enlarged side view of an information recording detection tag according to the present invention
in an example of a single smile example El, t3 FIG. 5 in which 1 is a cantilever, 2 is a contact
layer, 3 is an electrode, and 3b adheres and forms The piezoelectric element 6, 6 is a spacer, 8 is
an adhesive layer, 9 is a first detector portion, and a concave is an o'clock. It is a heavyweight.
The detector portion 9 of the sensor 1 is attached to the spacer 6 attached to the cantilever 1 via
the adhesive layer 2 The adhesive layer 8 is attached to the piezoelectric element 3 attached via
the cantilever IK adhesive layer 2 It is fixed by The detector portion 9 has a long base portion 9a
so as to be in pressure contact with a large number of convex portions in the concavo-convex
change due to the information recording signal recorded in the groove of the recording medium
disk, In addition, the second detector portion 10 described above is formed of a large number of
convex portions by the information recording signal in a state of being preliminarily compressed
by pressure contact with the bottom portion 91LK of the first detector portion 9 described above.
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A short base portion recess a which escapes from the bottom portion 9a of the detection portion
9 of the O1 and can receive nine convex portions, and the detection portion 9 of the above 9 O1
The portion 9 and the second detector portion report are provided adjacent to each other with a
gap B smaller than the recording wavelength dimension of the information recording signal
recorded in the groove of the recording medium disc. FIG. 4 is an exploded perspective view for
explaining an example of assembly of a detection element having a configuration as shown by oS,
in which each of the detector portion 9 of the tooth and the second detector portion wholesale is
shown. The corresponding portions are initially configured as each of the pentagonal prism
shapes as indicated by the solid line in the figure, and the interface with the spacer 6 in the
pentagonal prismatic material or the piezoelectric element 3 The bonding surface and the
bonding surface between the two members described above are finished sufficiently smooth. Vk
K with the spacer 6 and the piezoelectric element 3 fixed via the cantilever IK adhesive layer 2
and the pentagonal pillar shaped material described above with the spacer 6 and the
piezoelectric element 3 fixed via the adhesive layer 8 or the adhesive layer .
When the two pentagonal prism-shaped materials and the spanner 6 and the piezoelectric
element 3 are bonded, the two opposing prismatic materials of the two pentagonal prisms are
simply pressed against each other without facing through the adhesive layer or the like. From the
state K and the state K, a minute gap B is formed between the adjacent opposing wall surfaces of
the 21 detector portions 9 and the second detector portions 10. Next, the two pentagonal prismshaped materials are ground as shown by the broken lines in FIG. 4, and then the portions 91)
and 101) are ground so as to form a smooth flat surface to obtain the required configuration. The
detection element which it has is completed. In addition, for the pressure jE velocator 31iDt @,
3m) butterfly, to change the mode of adhesion of the piezoelectric element 3 in any vibration
mode, and the electrode &, 3m in the piezoelectric element 3). The adhesion must be performed
before the piezoelectric element 3 is incorporated as a component of the detection element, etc.],
and the piezoelectric element of the required configuration is prepared in advance as a
piezoelectric element to be incorporated and used in the detection element. It is natural to be
done. FIG. 5 is an explanatory view of rounding for explaining the operation of the detecting
element of the present invention having the above-mentioned configuration, and in FIG. 6,
reference numeral v # i in FIG. The uneven | corrugated change waveform by the recorded
information recording signal is shown. When moving in the direction indicated by the arrow in
FIG. 5, the recording medium disk D% is engraved and recorded in the groove of the recording
medium disk. The successive projections of the unevenness change due to the information
recording signal are at the detection element. The slope of the detector portion 9 of tl is that the
convex portions of the above-mentioned portion of the detector portion 9 of the tail end OK: 3
part 9 turtle slope ff 1 K 8 Eii L while advancing along the inclined surface The portion shown by
the dotted waveform portion in FIG. 5 is compressed. As is apparent from FIG. 6 and illustrated
from FIG. 6, the first detector portion 9 in the detection element has a change in the unevenness
due to the information recording signal engraved and recorded in the groove of the recording
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medium disc. The convex part after a long time is compressed to the next along the slope of its
bottom 9m, but it is made the most compressed state near the rear end of the first detector
portion 9 and the unevenness due to the nine information recording signal The convex portion
after a long time of change is significantly smaller than the recording wavelength dimension of
the information recording signal formed between the rear end of the first detector portion 9 and
the front portion l1ii of the second detector portion lO. The bottom of the second detector part
recess, 11s1Da, is reached via a narrow gap 8. In this way, a state where the detector portion 9
of O1 is preliminarily compressed into a state of 'is made, and the successive convex portions of
the concavo-convex change by the nine information recording signals take off the bottom portion
of the detector portion 9 of the fan 1 When reaching the lower side 10m of the bottom portion
10m of the second detector portion υ, it becomes K when the reaction force by the one convex
portion in the state of the second detector portion is added.
The nine reaction forces applied from one convex portion to the third detector element concave
portion are transmitted as elastic waves in the second detector element portion 10 to be applied
to the piezoelectric element 3, and the electrodes 3 a and 31 are obtained. > Electrical signals are
taken out. In the detection element of the present invention described above, a long time convex
portion of the unevenness change by the information recording signal engraved and recorded in
the groove of the recording medium disk is precompressed in the detection portion 9 of O1.
Going, and then precompressed by said detector portion 9 into a 9 year 2 detector portion 10,
configured to have a base dimension such that it can receive only one protrusion. The pressure
applied to the piezoelectric element 3 through the second detector portion concave is K because
the next IO convex portion in the state is given K, an information recording signal of the
information recording signal is applied to the bottom portion 10a of the first detector portion
concave. In the state in which the convex portion is in pressure contact, it is the largest in the
state where the concave portion of the information recording signal is at the position 1 in the
bottom 10a of the detector element close to 0g. The ratio of the maximum pressure to the
minimum pressure is infinite, according to the detection element of the present invention It is
being satisfactorily resolved point anal output signal in question in the conventional apparatus
mentioned. In addition, in the detection element of the present invention, the detection element is
divided into two parts, and in the first detection element part 9, the convex part of the concavoconvex change by the information recording signal is preliminarily compressed, In the subportion concave as described above, it receives the convex portion 1 @ in the state of being
preliminarily compressed by the first detector portion, applies the reaction force as an elastic
wave to the piezoelectric element 3, and obtains a signal output Since the length of the bottom
9a of the detector portion 9 of O1 is made sufficiently long and the inclination angle of the
bottom 9 & is occupied by a small K, the rotation of the recording medium disc rotates. The
friction force in the rotational direction of the disc applied to the detector can be made
sufficiently small, and the detector does not flex or double in the rotational direction of the disc
9. According to the detection element, the information signal recorded on the recording medium
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disc is faithfully detected. In addition, even if the first detector portion 9 runs on new convex
portions one after another as the recording medium disc rotates and starts compression, the
reaction force of seven is tg Therefore, even if the detection elements 21 of 21 are raised by 9 on
successive new projections 11, they are fixed to the third detection element and noise is not
generated in the nine piezoelectric elements 3. In addition, since the load of the detection
element is dispersed in the three detector portions 9 ° 1 Dk, the wear of the detector portion of
the dew progresses on average. Therefore, even if the second detector portion is extremely thin,
the progress of wear is slow, and a long-lived detection element can be obtained.
As described above, according to the present invention, it is possible not only to solve the
problems in the conventional device well, but also to easily provide a detection device with
excellent characteristics.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing an example configuration of a
conventional pressure sensing type information recording / detecting element, and FIG. 1 (i is a
side view and FIG. 1 (b) is a back view FIG. 8 is a schematic view for explaining the operation,
FIG. 3 is a side view of the detection device of the present invention, an o'clock is an exploded
perspective view of the same as above, and FIG. It is a side view of °. 1・・・カンチレバー、
2,4. F, 8: adhesive layer, to: piezoelectric element, 3a, sb: electrode, 5: detector, 6: svena, 9:
detector part of O1, i:・, T2 inspection load part, D ... recording medium disk. Patent applicant
Nippon Victor Co., Ltd. Attorney Attorney Takama Ima One character-Japanese EndPage: 5
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