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JPS554711

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DESCRIPTION JPS554711
Description 1, title of the invention
Pressure disc player pick up
5. Detailed Description of the Invention The non-firing fIA relates to the pickup of a pressure type
disk player, which has a light needle pressure and hence a small wear of the disk and the
reproduction needle over it, and can greatly derive a reproduction output The following 211 has
been proposed as pickups to be used in pressure type disk players which are to be provided, in
particular those handling frequency signals such as video information. The first is a reproduction
needle (1) as shown in FIG. -Pressure sensitive element I! 1.41 counter (3) k sequentially stacked
and supported by the cantilever: 41, the pressure sensitive element (2) and the position (6)
substantially stop each other during the regenerating operation. It is preferable to detect the
pressure deterioration 11-when the tip of the reproducing needle 11 pressed against the signal
asperity on the disk 6 is released. In this pickup, the i & fake (3) is thrown to separate the
cantilever (4), which follows the low frequency vibration such as up and down deflection, from
the eccentricity-of the disc, The cushioning material is made of rubber having a Shore hardness
of about 95 f :. The drawback of this pickup is that it must be deformed by the biased convex mt
regeneration needle on the disc, so the needle pressure of the regeneration needle is large (7t
and 0.2yr) l, and the disc and regeneration must be The large wear of the needle and the use of
the next elastic deformation make it impossible to increase the recording density of the signal.
@), 2 as shown in the figure 1% 2 生 生 scream. Pressure sensing element -1), buffer TJtlk
sequentially stacked to support cantilever EndPage: 1 bar in particular, but it is a signal using a
typical inclination change as follows? It is intended to be detected. Although this method is
described in detail in Japanese Patent Publication No. 51-25892 or Japanese Patent Application
Laid-Open No. 5l-t04502 etc., the angle change (tJ-01-02) is calculated for the numerical
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examples shown in these official gazettes. Then it is about 0.1f concealed, and it is recognized
that it is considerably less than L degree even if it is estimated that it is less than L degree. In the
case where the voltage output section a (not) uses an element of 28 × 1O-5 v @ i, the output
based on the stress change is not as satisfactory as 1.5 × 10 mV, and at the minimum
Recommended 1 / io of output. It is an extent. Also, it is very difficult to change the tilt angle of
one regenerating needle and the pressure-sensitive element at a frequency of several MHIg due
to the deflection of the buffer, and the change in the angle becomes very small, so the output
voltage is further reduced.
SUMMARY OF THE INVENTION The present invention has been made in view of the abovementioned drawbacks, and is intended to provide a means of obtaining excellent output voltage
while being excellent in wear resistance. Next, the present invention will be described with
reference to its embodiments. FIG. 6 shows a cross-sectional view of the signal detection S- of the
pickup and the signal groove extension direction of the record 俤 9) which is in contact with it
Sita (the number of detection units of the pickup is the reproduction needle と), The pressuresensitive element fixed on the bottom, and the elastic body 固定 and r fixed on the bottom, are
supported by the example of the cantilever. The regenerated needle + 311 is a grinding process
of an octahedral crystal of artificial diamond into a ship bottom shape, and each side and height
of the attachment ff + 1 of the regenerated needle to the pressure-sensitive element is about 50
to 150 μm. . The radius of the tip portion (11) seen from the projection surface (51a) of the
regenerated needle is 1 to 4 μm. The pressure sensitive element 620 has a length and height of
100 to 200 μm on each side and 50 to t5 LJpm, respectively. It is Elastic body aL1 # i Shore (+1!
It is formed in the shape of a rectangular parallelepiped from natural (or synthetic) rubber
having a diameter of 50 to 90 degrees, and its thickness is suitably 100 to 50 CD mli. It is
desirable that this elastic body contains carbon or metal, and in this case, the elastic body is
bonded to the pressure sensitive element and the example of the cantilever by the conductive
mW agent, respectively? It can be used as one lead of a pressure sensitive element. The other
lead company is bonded with a conductive adhesive to one of the other forces of the pressuresensitive element country, but it is not shown. In addition, it is necessary to use a hard adhesive
as much as possible so as not to cause attenuation at the joint between the regenerating needle
(3Il □ ') and the bond line of the sensor I and f'i. ピ ッ ク ア ッ プ pick up 【Am relative to the
record さ せ m m 体 ANm combined 1 elastic body product is a solid line 点 線 dotted line ct) KJ
伸縮 伸縮 extend and respond to the convexity of the number on the record . That is, when the
record moves backward in the direction of the arrow, the tip end portion (51b) of the red needle
needle is detached from the position of the individual number convex portion (Po) of the record,
and the ridge portion (61α) It moves as indicated by a dashed dotted line until the image on the
signal convex part (Pl). Then the tip of the 4I No. 11 (P,) K is late, and after seventy the same
operation again? Repeat. The first half of this movement. The spring body and dash hot pull
shown in FIG. 4) and the elastic body (the elastic body (roll)), the pressure sensitive element, and
the mass corresponding to the synthetic i amount of the regenerating needle @ li% are suspended
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thereon It is possible to analyze with
As a spring constant 1 as a fortune equation? たてれば。 yz + kx = 0 ■, the solution. It becomes
x = Acos and / Nt (A # f constant). Therefore, the pressure F applied to the pressure sensitive
element (c) is. F = kx = W cos πt (following 3 W = kA). Further, after the second half of the
exercise, that is, after the ridge line portion 1c of the regenerating needle abuts against the
convex portion (Pl), the tip portion of the arresting needle rises linearly, reaching the top thereof.
The force F received by the pressure sensitive accumulator is relatively equal to the force
received from the elastic body, and changes in a manner as shown in FIG. In the figure, B, O 、
constant. And, the time that To, 11 butterfly loose bite S (EndPage: 261b) is engaged with the
convex part (Pa) (P +) respectively, 9 Ql * Qt is the ridge IM part (51C) convex part (po) ) (PI ')
time each engaged? Show. This change in pressure can be made considerably large by
appropriately selecting the elastic coefficient of the elastic body, the synthetic needle 311, and
the integrated quality of the pressure sensitive element and the elastic body, etc., tk. Tomoe has a
needle pressure of 2 Um at a wavelength of 2 μm O! In the case of reproduction with a
reproduction needle of γ in the following case: 1 embodiment O piezoelectric element [area
(150 × 10−6) 't thickness 110. gmtt pressure output coefficient 28 X 10 "" / y], the output of
20 to 50 mVM? It is acknowledged that you can get it.
4. Brief description of the drawings FIG. 1 and FIG. 2 d [A configuration diagram of the pickup of
rice, FIG. 6 is a configuration diagram of one medical embodiment of the present invention indigo
pick amplifier and a record in which it contacts. FIG. 4 is a model diagram for use in clarifying
the operation of the present invention, and FIG. 5 is a time chart of the force applied to the
pressure sensitive element. --Signal conversion unit, shout) ... Reproduction needle, v4 ...
Pressure-sensitive element. 瞥 ... elastic body,-... cantilever. EndPage: 3
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