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? Optical Reproducing Apparatus O Patent Application No. 46-85410 Application No. 46 (1971)
Published February 23 A. No. 47-21106 ? Applicant Tokyo Shibaura Electric Co., Ltd. 72
Horikawacho, Yuki Ward, Kawasaki City [Phase] Agent Patent Attorney Suzue BACKGROUND OF
THE INVENTION 1. Field of the Invention The present invention relates to an optical reproducing
apparatus, and more particularly to an optical reproducing apparatus suitable for reproducing a
signal recorded at high density on a disc. Conventionally, there are a record phonograph and a
video disc as a concavo-convex recording medium. This signal regeneration device mechanically
regenerates from the modulation groove. That is, in the former, mechanical displacement occurs.
In the latter, the signal was regenerated by generating mechanical elastic waves. Therefore, the
former has disadvantages such as low recording and reproducing high frequency and contact
with a sharp needle to cause deformation, wear and damage of the medium and deterioration of
signal quality, and the latter causes elastic wave. The use of sharp corners at the trailing edge
and contact pressure are also required to cause deformation, wear and damage of the medium,
degradation of the quality of the signal [111111], and electrical waves rather than elastic waves.
It has the disadvantage that the lowest maximum frequency range is also limited due to the
resonance of the piezo element for conversion to a signal. SUMMARY OF THE INVENTION The
object of the present invention is to solve the above-mentioned problems, and to provide, for
example, an optical reproducing apparatus capable of reproducing a wide band signal recorded
with high density with long life with less deformation, wear and damage of the medium. . It is
well known to optically reproduce to improve the wear and damage due to the reproduction of
recorded media. The invention is characterized by the optical structure of the reproduction
element. That is, the present invention is an apparatus for optically reproducing a signal by the
relative movement of the reproducing element facing the recording medium, and the optical
structure of the reproducing element is as follows. That is, one face is gradually separated from
the recording medium with respect to the direction of the relative movement, that is, the curved
face and the other face is sharply separated from the recording medium, ie, a reproduction
needle having a transparent body with a flat surface structure Take the light modulated by
reflection or transmission in the recording medium. It is a signal reproduction device which
converts this into an electric signal. 1 Next, the device according to the present invention is
suitable for reproduction of a disc having a concavo-convex modulation groove (an embodiment
will be described with reference to the drawings. That is, the first one. In the figure, the
reproduction element, for example, the reproduction needle 1 is in the state of being mounted on
the modulation groove 3 in which the recording signal of the recording material 2 is modulated
to unevenness. FIG. 1 is a cross-sectional view of a plane perpendicular to the relative movement
direction. A cross sectional view on the center line of the modulation groove 3, that is, a cross
section in the direction of relative movement is shown in FIG.
The reproduction needle 1 comprises a transparent portion 21 and an opaque portion 22. It is a
feature of the present invention that the transparent portion 21 has a sharp corner (at right
angles in the figure) shape at a point 4 of the interface 8 in contact with the modulation groove
3. The other surface 5 of the transparent portion 21 has a curved shape, that is, a shape that is
gradually separated from the recording material 2. Also, if one side 6 of the opaque portion 22 is
also curved, it is advantageous because the modulation groove 3 is not mechanically damaged. As
can be seen from FIG. 1, the shape of the reproduced [111111] EndPage: 1 needle 1 in this case
is the direction of the modulation groove 3 (longer in the relative movement season, at least the
width direction of the modulation groove 3 is modulated at the tip) It becomes considerably
shown in the width position of the ditch. Since the materials of the transparent portion 21 and
the opaque portion 22 resist wear due to sliding with the recording medium, sapphire, diamond
or the like may be applied to the former. For the latter, tungsten or the like may be used. Since it
is sufficient to mirror-polish the surfaces 8 facing each other and bond them to form a united
body by grinding and shaping, finishing is relatively easy. In operation, light is first introduced
from a light source unit (not shown) at the base of the transparent portion 21. The light is
transmitted to the surface in contact with the modulation groove 3 via the transparent portion
21 but the reflected light is different between the convex portion 23 and the concave portion 24
of the modulation groove 3. For example, when the recording material is a transparent material
such as vinyl such as a record disc, the convex portion 23 is in contact with the transparent
portion 21 of the reproduction needle 1 of a material having a large refractive index such as
diamond. However, since the concave portion 24 is in a non-contact state, a large amount of total
reflection is likely to be reflected in the transparent portion 21. On the other hand, if the
processing with a large amount of reflection (for example, a diffusion surface) is performed on
the convex portion 2: 3, the convex can also increase the reflection. Thus, when the reproducing
needle 1 and the recording body 2 move relative to each other, the light reflected in the vicinity
of the sharp end 4 of the transparent portion 21 is modulated under the influence of the
modulation groove, but In the vicinity, since the modulation groove 3 is gradually approached (or
separated), the reflected light can be prevented from being modulated. That is, since the light
modulated according to whether the modulation groove 3 is concave or convex is incident on the
transparent portion 21 at the fourth sharp end, a light receiving portion which has this light as
the light source portion and the base 4 of the transparent portion If it is transmitted to the
illustration f) and received by a photoelectric conversion element such as a photomultiplier or a
phototransistor, it can be regenerated as an electric signal. The light source unit and the light
receiving unit can be easily separated by a known technique such as a half mirror.
? In order to effectively use the modulated light by the modulation groove 3 (as shown in FIG. 1,
the side surface 6 of the reproduction needle 1 is light-shielded-^ [?-, ? L knee 1--11-1 groove
3 Effect of transmission and reception of light to the part facing to---1111-7-to-1-1-1-1-----! + &Kore-Jm-LA-aJM + 1 m, *--m * 11 Ming-2-5-1 Ji-one to one one one one-one I-1--/ / T7bl> L, s If
the crystal a1h1wt-growth yw,-,------, then only the portion facing the modulation groove can be
excluded [111111]. The material of such a light shielding film is preferably a metal or the like
having a good internal reflection efficiency of the transparent portion 21. When the recording
body 2 is a rotating disk, the entire structure other than the reproducing needle 1 is completely
the same as that of reproducing a record phonograph, but for high frequency signals, it is
Bernoui's law as a flexible disk like a video disk. It is sufficient to rotate stably at high speed. In
the case of a tape, the same structure as a video tape recorder (VTR) may be used. The direction
of the relative movement may be selected on either side, but when the opaque portion 22 is
larger than the transparent portion 21 in the wear due to the deformation 3, the boundary 4
((the curved end 5 of the transparent portion It is better for the recording medium 2 to move
relative to the direction. As described above, according to the present invention, it is possible to
make a structure in which a large force is not locally applied to the recording material on the
surface of the reproducing needle in contact with the recording material. And cause less damage,
and can reproduce high quality signals with long life. The shortest recording wavelength can be
made sufficiently small because the recording medium is not composed of particles as in
magnetic recording. However, due to the structure or method of the reproducing needle 1,
practical limitations have been large in the conventional concavo-convex recording due to the
problems of deformation, wear and damage of the medium. However, according to the present
invention, the above-mentioned problems are hardly found, and in principle, only the roughness
accuracy regarding the relative movement direction at the sharp end 4 of the transparent portion
21 relates to the shortest recording wavelength that can be reproduced as a structure. Therefore,
if the surface 8 constituting this is finished with high accuracy, very high density recording and
reproduction can be performed at the recording wavelength corresponding to the roughness of
this surface. : Regarding the reproduction sensitivity, there is a feature that the reproduction
signal level can be raised if the quantity of light introduced is sufficiently large. This limit may be
considered as: the amount of light that causes the medium to thermally deform. : The
photoelectric conversion element does not resonate like the elastic vibration conversion element,
so the maximum grain size of the reproduction signal: the frequency range is wide, and the
intensity of the light to be the signal is the relative traveling speed between the body and the
reproduction needle It is irrelevant to the following: + / +-1 + 1 J и 7 M-? l J-L w-J li [li-Shinoso 1
1 U1 hi p ^ and starvation Roso-further) f years old: may be incandescent bulbs, such as light
emitting diodes The signal can also be reproduced as a modulated wave of small [111111]
EndPage: 2.
In this way, amplification after photoelectric conversion is facilitated by using a high frequency
band amplifier (similar to the intermediate frequency amplifier). When the signal to be recorded
is recorded in the modulation groove, if the frequency modulation used for VTR or the like is
used, the problem of the linearity of the reproduced signal may be reduced. In the above
embodiments, the reproduction from the concavo-convex recording material has been described,
but the mechanism recorded is a recording material printed on a flat plate, for example, a
recording material printed on a sheet of paper having the property of transmitting light. Any one
may be used. Furthermore, although the above embodiment uses reflected light from the
recording medium, it may use transmitted light, and the embodiment will be described with
reference to FIG. In the case of the transmitted light 21, the modulation groove 3 is more
effective in terms of density than unevenness. In FIG. 2, the modulation groove 3 of the recording
medium 2 may be modulated by the light shielding (or light absorbing) portion 9 and the
transmitting portion 10. In this case, the light source unit may be placed, for example, on the
back surface of the recording medium, and the light transmitted through the modulation groove
3 may be conducted to the light receiving unit through the transparent portion 21 of the
reproducing needle 1 as in the above embodiment. In this case as well, the modulation is received
at the sharp end 4 of the transparent portion 21. However, when the curved end 5 enters the
transparent portion by the light from the light source portion, it is removed to such an extent
that the image of the shades 9 and 10 of the modulation groove is sufficiently blurred. The curve
should be gradually isolated. The position of the light shielding film 7 may be set C in
consideration of this point. Further, since it is sufficient if the position of the light source part is
substantially on the back surface of the modulation groove 3, an actual light source is provided
on the same side as the reproduction needle 1 with respect to the recording material 2 in parallel
with the reproduction needle Light may be used after being reflected by a reflector provided on
the back surface (the lower side in the drawing) of the recording medium 2. Further, a reflecting
film may be provided on the back surface 11 of the 11111111 cone 2. In addition to using an
optical film such as a silver salt as a method of forming shading, a substance to be shielded or
absorbed is filled with a portion of 9 that became a recess after concavo-convex recording of a
form in which the production portion 9 of FIG. May be If a substance that effectively reflects this
material is used, it is possible to adopt a reproduction method using reflected light similar to that
shown in FIG. In the case of the reproduction method using transmitted light, it is possible to
provide the light source unit on the side of the reproducing needle 1 and the light receiving unit
on the side of the recording medium 2 contrary to FIG. As described above, the opaque needle is
not essentially required as the structure of the recycled needle according to the principle of
regeneration, and a light shielding (reflective) film may be added to the end face 8 of the
transparent portion except for this. In this case, it is necessary to select the direction in which the
recording medium moves from the end 5 to the end 4 of the transparent portion in consideration
of damage to the modulation groove.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view for explaining an
embodiment of the device of the present invention, and FIG. 2 is a cross-sectional view for
explaining another embodiment of FIG. 1 иии и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и modulation groove, 4 и и и и и и и и
и и и и и и Curved end of the part 6 Curved end of the opaque part 7 Light shielding film 8 Flat
surface of transparent body 10: Transparent part of modulation groove 11: Reverse side of
recording material 21: Transparent part of reproduction needle 22: Reproduction Opaque part of
the needle, 23: convex part of the modulation groove, 24: concave part of the modulation groove.
O Reference Document JP-B-49-47163 [1111111 EndPage: ?
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