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JPS5239105

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DESCRIPTION JPS5239105
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a model diagram showing the relationship
between a conventional pickup and a video disc, FIG. 2A, and a mouth are front and bottom views
of this pink-up, and FIG. Fig. 2 is an x- 薪 plan view as shown in Fig. 2A and shows different
operation modes. FIG. 4 is a partially omitted front view of the big-up of the present invention,
and FIG. 5 is a cross-sectional view taken along the line Y-Y in FIG. Explanation of main figure
numbers, 5 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · powder. Figure 2 (I t OJ-9-real open 5239 105
(2) Figure 3 Figure 4 Figure 5-10
DETAILED DESCRIPTION OF THE INVENTION The invention relates to the improvement of
pickups for video discs. Fig. 転 Roll A model showing the relationship between a conventional
pickup and a video disk, where (1) is a video disk, (2) is a stylus, (3) is a pressure sensitive
element, and (4) is a damper, (5) shows a holding number, (6) shows a ring, and (7) shows a
pickup case. FIG. 2a shows a front view and a bottom view of the pickup, the tip of which is
shown in a simplified manner. Third factor and 60) 1 also show an X-1 cross-sectional view in
FIG. 2 and show different operational aspects. (8) shows the coupling portion between the pickup
case and the ring. 2) The pickup case must be designed to cover the tip as much as possible in
order to protect the pickup tip from mechanical impact from the outside, and unnecessary
electric signals at the tip In order to prevent K from being picked up, the opening for projecting
the tip must be as minimal as possible, therefore, the inner wall (7a) of the pickup case (7)
opposite to the ring (6) The space between) is as narrow as possible. The ring 16 is provided for
the purpose of attenuating mechanical vibration (low frequency) of the pickup and maintaining
the compliance of the needle tip to a predetermined value, and it is made of an extremely soft
material such as silicone rubber having an internal damping action. ing. This ring is in contact
with the inner wall surface (7a of the case as shown by nK) at the time of play because the needle
tip compliance of the pickup is high even in the lateral direction (arrow in FIG. 3) k. The
phenomenon in which the side portion adheres to the inner wall often occurs. That is, a
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phenomenon occurs in which material is attached or detached for a long time. 3 This
phenomenon occurs because the surface of the silicone rubber has a tendency to adhere
(becomes sticky). That is, for molding of silicone rubber, a method consisting mainly of a main
rubber and a vulcanizing agent and adding a thinner for hardness control may be performed, or a
type called RTV (addition type) may be used. It often happens that the silicone rubber 14 has the
special property that there is an unreacted portion or the components constituting the rubber
such as solvent (thinner) and filler remain after curing, so that the viscosity of the surface
increases. As described above, when the surface is viscous, it easily adheres to the pickup case.
As a result, tracking error occurs, and deterioration of the style due to contact with the disc
groove in a state where the style is skewed is deteriorated, and good reproduction is achieved.
Can not be expected.
The invention 6 also provides a pickup for preventing such a phenomenon, and a nasal
hygroscopic powder is applied on the side of the ring that elastically supports the middle portion
of the holder opposite to the inner wall surface of the pickup case. We propose four video disc
pickups that feature the above. A fourth embodiment of the pickup according to the present
invention is a partially omitted front view, and FIG. 5 is a sectional view taken along the line Y-'1
in FIG. The basic configuration of this pickup is the same as that of the conventional pickup
shown in FIG. 1, but in the present invention, in view of the above phenomenon, a ring (61 for
elastically supporting the middle portion of the holder 5) It has a feature in that it is coated with
powder having no absorption properties, such as sky pollen, stone pine, etc. (9). Although the
kernel powder (9) must be applied to the surface of the ring which may come in contact with the
inner wall surface (7a) of the pickup case (7), the support should be bonded to the ring In the
adhesive layer (most) surface of the adhesive, it is desirable to apply it if it causes concern that it
abuts the inner surface of the pickup case 11; Since the ring is applied by the above method, the
ring does not adhere to the inner wall surface of the pickup case, and the above phenomenon can
be prevented.
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