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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an idealized illustration of a diamond crystal
employed in a pickup for video disc, and FIG. 2 is a diagram showing the surface shape of 1,1
and 1 faces of synthetic diamond, Fig. 3A illustrates the effect of the tree pattern of synthetic
diamond on the mouth, Fig. 3A is a front view of the surface of the stylus, Fig. 3B is a side view of
the video disk, and Fig. 4 is the present invention. FIG. 6 is a side view of a pickup according to
FIG. Description of the main figure number, 1 ...... stylus, 2 ...... video disk, 3 ...... pressure-sensitive
element, 1c ииииии rushed out of plane, Ll ии .... ridge line.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a video disc
bitmap up employing synthetic diamond send as a stylus material, so that even if the tip of the
stylus is worn, the angle between the ridge line and the projection surface does not become F
The invention relates to a pickup for a video disc. A stylus which is in pressure contact with a
pressure type video disk formed by recording video signals etc. on a medium is formed of the
hardest diamond material in consideration of wear isoelectricity and is S3-viO32. Also, synthetic
diamond of the shape of 8ii body as shown in FIG. In Table 2 of synthetic diamond, patterns such
as branches of trees and branches of trees as shown in FIG. This is a characteristic of synthetic
diamond and is formed of a thin layer of a solvent such as N1 or Fe used in the synthesis of
synthetic diamond, and its natural language 7 ? 1 fraction is not flat. The most common method
of processing such synthetic diamond to form the above-mentioned stylus consists of grinding an
appropriate angle with respect to the (110) plane of this diamond and processing its polishing II
as a pressure-sensitive element Bonding to, and processing to make the opposite (taO) liK near
face face the signal groove of the video disc, leaving the other part as the natural crystal face of
synthetic diamond is there. In this case, a natural crystal plane (ttl) ml at an angle-with respect to
a ridge line which is an intersection line of the ridge surface is a so-called run-out surface. Since
this surface is not flat as described above, it has been found that this stylus has the disadvantages
described below in a row; As shown in FIG. 3 (b) (b), when the scanning and re-slip of the pick-up
stylus is repeated, the progressive wear shown by the stylized tip having a stable performance as
shown in FIG. It will progress to come into contact with the dendritic pattern of runoff
improvement. Then, although the angle between the ridge line (L +) and the projection fB (S +) is
4 at the beginning, the angle between the ridge line (L2) and the projection surface in contact
with the dendrite ?? ? convex as shown in the drawing is 1 ?. And carbonize greatly. The
change of this angle, that is, the running angle affects the apparent tip of the running edge and
causes deterioration of the frequency characteristics of the pickup. That is, it becomes difficult to
detect the domain frequency signal. Thus, the natural crystal face of the synthetic diamond is not
preferred as the run-off of the pick-up stylus. According to the present invention, as shown in
FIG. 44, the above-mentioned defects are caused by lapping the base, which is an outgoing
surface, at a predetermined angle with respect to the natural crystal face of the threat diamond,
thereby making the dendritic pattern having a natural crystal direction. To eliminate the
As shown in FIG. 4, (11 is a synthetic diamond stylus, t21 is a video disk, and (3) is a pressure
sensitive element. The stylus is abraded so that the m (1 m) in contact with the pressure sensitive
element is a plane with an appropriate angle to the C tan plane of the synthetic diamond, and the
opposite (? 0.0) plane The surface close to the above is also polished to form wall surfaces (1b)
facing the signal grooves of the video disc on the upper surface and the back surface of the paper
surface, with ridge lines (L1). Furthermore, the surface to be the exit surface (1C) of the stylus is
formed by lapping in a direction at a predetermined angle I from the (tll) surface of the natural
crystal surface of synthetic diamond. Since the diamond (ttl) li is the hardest surface, it is
considered ineffective to lapping the surface, but as mentioned above, its processing is revisited
from the fact that it has an angle door. It has been found that the angle I should be about 150 in
order to satisfy this processability and the original performance of the pickup. The arrows in the
figure indicate the direction of rotation of the video disk 5. How about the synthetic diamond,
because the machining surface with a predetermined angle to the natural crystal of synthetic
diamond was selected as the traveling surface of the stylus that runs relative to the signal groove
of the crystal medium. It is possible to eliminate the above-mentioned drawbacks of the
conventional pick-up with the natural crystal face traveling away, and at the time of always stable
reproduction 7, regardless of the use state of the stylus; ? J mt 6 ct! ??????
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