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JPS5037402

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DESCRIPTION JPS5037402
Special · l '2 ",' m-wishes □,-August 311, the inventor '1'-touki] Udo '' Kui /, l hem, koi vu k fIF, fi
斤 Tokyo Kokubunji Higashi Koi Kubo 1 chome (Haha 2) Patent applicant IJ place Marunouchi,
Chiyoda-ku, Tokyo-5th No. 1 name + 5101 Hitachi made in 4% Co., Ltd. Representative Hiroyoshi
Yoshiyama Representative 1 Place 1: Marunouchi in Chiyoda-ku, Tokyo-No. 5 No. 1 Hitachi, Ltd.
Internal Story Tokyo 270-211'l (Large Representative), Name (7237) Patent Attorney Thin 1)
Toshiyuki; (1975), 4. 8 ■ 持 Lg-86 835 [phase] application date Shogo (1973) &, 3 agency
numbers b'lb'l '), 30 Japanese classifications ■ Int, CI 2
1 (QC 3 LHHRzi) Name of the
invention of unevenness signal reproduction device, signal detection needle, means for running
the signal detection needle t in the mime, means for squeezing light to the contact point of the
detection needle and the recording medium, and An optical waveguide whose part is provided on
the detection wave end face for the first metal conduction which is modulated by the unevenness
signal recorded at the contact point of the detection needle and the recording medium, and this
waveguide Having all photoelectric conversion devices that convert the intensity of light passing
through the inside into an electrical signal? Signal reproduction device characterized by
Claims
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for
reproducing an original signal recorded on a circular i-recording medium, and more particularly
to an apparatus for reproducing an original signal recorded in the form of irregularities on the
surface of a disc-shaped recording medium. . According to the prior art, the diamond needle
travels in the spiral groove like a normal acoustic record, and the signal recorded in the form of
asperities is reproduced in the form of pressure changes and placed behind the diamond needle.
Although this method is very excellent, it is converted into an electrical signal by the piezoelectric
transducer, but in order to travel the needle in the groove as the needle travels completely and to
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obtain a sufficient S / N reproduction signal Have to apply considerable needle pressure to a
small needle, and disc and diamond needle wear becomes a problem.-According to another
conventional method l (accordingly, all the lenses of the laser beam have a diameter of about 1
.mu.m) The point is squeezed, the uneven portion on the root is irradiated, and the change in the
reflected light due to the unevenness is reproduced as a total signal. In the case of this method,
since the trace by the needle of the groove can not be made, the light spot must be traced to the
recording track on which the signal is recorded by a special servo mechanism. The object of the
present invention is to realize a reproduction system that does not have the disadvantages of the
above two systems, has no fear of wear, and does not require any special servo mechanism. · · ·
The feature of the present invention is that the recording track tray is a method to make the end
of the hard needle like an ordinary acoustic record EndPage: 1-speed, and the reproduction of the
signal is not pressure pressure, it is optical To detect. Hereinafter, the present invention will be
described by way of examples. FIG. 1 is a diagram showing the configuration of the main part of
one embodiment according to the present invention 0 light source 1 may be a laser or a general
light bulb, and light emitted from light source 17 + 1 ′ is reflected by mirror 2 The zero
objective lens 3 led to the objective lens 3 narrows the beam to focus on the surface of the
transparent disc 4. On the surface of the transparent disc 4 there is placed a reproduction needle
6 which has a spiral groove 5k raced on the surface of the disc 4. An optical waveguide 7 is
provided on the end face of the reproducing needle 6. An enlarged view of this portion is shown
in FIGS. 3 and 4. As shown in FIGS. 3 and 4, in the groove 5 of the transparent disk 4, asperities
having a depth of 10 as shown in the drawing are sharpened. The beam is focused by the lens 3
and the light beam portion of the reproducing needle 6 is reflected. If all the laser light is used,
the next ray having the same phase reaches this portion. But figure it! As in 1lriA et al., Due to
the unevenness of the disk surface, the light beams 8 and 9 will have a retardation at the end
face of the optical waveguide 7 due to the difference between the refractive index of Di and the
arrival rate of air. O Assuming that the phase difference δ is a value pt of the refractive index
kn% of the disk medium and the depth lO of the disk surface, δ−2π (n−x) t / λ where λ is
the previous wavelength used for reproduction Then, .delta. =. Pi., And the phase difference
between the light ray 8 and the light ray 9 (the exact difference is 180.degree., And the phase is
inverted).
Assuming that the optical waveguide 7 is a waveguide that transmits only a single mode, the light
propagation mode is a mode in which all the light has the same phase 7 in the cross section of
the optical waveguide, as shown in FIG. When 11 reaches the exact center of the optical
waveguide, if the condition of equation (1) holds, the phase difference of the waveguide is 180 °
at the cross section of the waveguide, and light of such a mode is waveguide 1 In the position
shown in FIG. 5 where it becomes difficult, light of the same phase reaches the end face of the
waveguide, so that light will pass well through the waveguide at such a position. If the medium 4
is moved relative to the reproducing needle 6 by rotating the disc as shown in FIG. 1, for
example, as is shown in FIG. 1, the waveguide is formed at a position corresponding to the edge
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of the medium? Less light passing through, surface irregularities? , Can be converted to the
intensity of light passing through the waveguide. The optical fiber 12 is coupled to the upper end
of the waveguide 7 and the waveguide 1? The transmitted light is led to the optical fiber 12.
When the cross-sectional shape of the core portion of the optical fiber 12 falls within the cross
section of the optical waveguide, there is no interval iM, but if the shape of the core portion is
larger, the light passes through the optical waveguide. It's over. It is necessary to cut the first
metal coming into the core 25 of the optical fiber 12 through the regenerating needle. For this
purpose, it is only necessary to make a mistake in some way except for the waveguide portion of
the reproducing needle 62. To that end, the light reflecting layer 26 is deposited on the end face
of the regenerating needle as shown in FIG. 5, or as shown in FIG. Tilt it over an angle so that the
light that has leaked does not enter the core. The light that has entered the optical fiber 12 is
guided to this fiber, and is guided to the cantilever 13 and further to the center of the
reproducing arm 14 and to the photoelectric conversion element 16. In this way, it is possible to
lead to the light / weak signal all photoelectric conversion element of the light corresponding to
the edge portion of the concavities and convexities in the miso 5 and convert it into the two
electric signals by rotating the four transparent disks j. The spiral groove 5 is traced by cutting
the groove 5 on the disk 4 into a spiral shape and forcibly moving the arm 14 in the entire radial
direction in response to the rotation of the disk 4 so that the spiral groove 5 is completely traced.
It is possible to reproduce the full length time of the unevenness signal inside. As this signal,
consider, for example, a television signal or a signal obtained by frequency-modulating an audio
signal. Is this signal? Recording in the form of asperities of a given depth on the recording
medium, the change in the position of the asperity portion of the asperities represents this entire
signal.
In this way, playback of the television signal for a long time is done by EndPage: 2 r by rotating
the recorded disc. For example, Japanese Patent Laid-Open No. 47-374.15 "1 etc. is realized by
known means such as Japanese Patent Application Laid-Open No. 47-374.15" 1. According to the
conventional optical reproduction image recording plate, the light spot narrowed by the lens 3
needs to be precisely traced to a signal recording track having a width of about 1 μm. However,
according to the present invention, only the light passing through the optical waveguide is a
problem, and the area of the light spot itself can be reproduced even if it is larger than the track
width and the signal recording wavelength. Therefore, there is no need to perform accurate track
tracking of light spots as described above, and an inexpensive and reliable player can be made.
Also, according to this method, the needle pressure applied to the regenerating needle only needs
to be traced by the needle, and the contact area between the first needle and the disc can be
made sufficiently large, so wear of the needle and disc is small and stable regeneration is
possible. In the case of using the present invention for reproducing a television signal as a single
line, it is a transparent disc, a reproduction time of 30 minutes, a reproduction rotation speed of
900 vpm, and a television signal frequency of 45 to 6 MIIz. It is assumed that frequency
modulation is performed at Then it is next door. The pitch 20 of the track 5 is about 3 μm 1
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minimum recording wave. The length 21 is about 1 μm. The end of the optical waveguide. The
width 22 is 2 μm, and the thickness 23 is 0.5 ° μm. A dog with a light spot that is narrowed by
the lens 3. If, for example, the diameter is about 100 μm, the eccentricity of the 4 disks, the
vibration, the arm, and the feed error of 14 are obtained. There is no special track tracking servo
mechanism because pushing less than 100 μm is not so difficult. You can play the signal with
On the other hand, if this is done, the light emitted from the light source 1 enters the optical
waveguide and is reduced by the ratio of 0, 5 and 0, but this decreases with the high sensitivity
photoelectric conversion element, for example Optical signal detection is possible by using an
electron multiplier tube. Another embodiment of the present invention is shown in FIG. In FIG. 7
(Rin light 1 is a half mirror 18? The light is focused by the lens 17 and guided to the optical fiber
12. The optical fibers 12 reach the reproducing needle tip two times in the lock arm 14
cantilever 13 as in the previous embodiment. The light from the light source is guided to the light
guide 7 on the reproducing needle 6. The portion where the reproduction needle 6 is in contact
with the disc 4 (which is transparent in this embodiment but need not be) is the same as in the
above embodiment.
Therefore, in the position as shown in FIG. 3, the other half of the light emitted from the entire
optical waveguide 7 is immediately reflected on the disk surface. However, the other side travels
in the air and is reflected at the bottom of the recess of the disc asperity and returns to the light
guide 7. The phase difference δ between these two lights is δ = 4πt / λ, and assuming that
−λ / 4, then δ = π, and the amount of light returning through the optical waveguide 7 is the
same as in the above embodiment. In the position of FIG. 5, the amount of light returning to the
optical waveguide 7 is larger than that in FIG. 3 because the reflected light has the same phase.
Accordingly, the total amount of light returned by the optical waveguide 7 changes in accordance
with the uneven edge portion. . Light reflected from the disk 4 and returned to the optical
waveguide 7. In order to increase the load, add the disk surface v rate a. Good, it is very effective
to coat with a gold coating. The optical waveguide 7 completely returns. Light quantity by signal.
Changes the light in the opposite direction to the incident light in the optical fiber 12, lens 17?
Street, according to Half Mira-18. The light is reflected and led to the photoelectric conversion
element 16 to be converted into an electric signal. Show the configuration. In this embodiment,
the light reflected by the disk surface and entering the optical waveguide 7 is on the reproducing
needle 6. The light is separated from the incident light by the directional coupling circuit 19
provided, and is guided to the photoelectric conversion element 16 by another optical fiber 24.
Although the width of the light guide 7 purple rectangle is constant in the five or more
embodiments, the width of the light guide 7 is increased by 2 to increase the amount of light
guided to the light guide 7 as shown in FIG. It is also effective to use a gradient or 1 / DO′−1,
and in all the embodiments of 1 above, the end waveguide: long end page: a waveguide sound of
a cross section of 3 squares is used as the optical waveguide 7 Use optical fiber gold and bond it
to the regenerator 6 and use 'T /) is also possible 1 /). Further, in this case, it is possible to
adsorb the optical fiber 12 to the regeneration needle 6 and directly expand it to the contact
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point of the regeneration needle 6 and the tis 4 so that the entire optical waveguide 7 can be
removed. 1 Figure 3. FIG. 5 is a partially enlarged view of the regenerating needle used in the
present invention, a sectional view including the longitudinal direction of the signal groove FIG. 4
is a partially enlarged view of the regenerating needle used in the present invention, FIG. Figure
7 showing the shape of the embodiment of the reproduction needle used is another embodiment
according to the present invention. FIG. 8 shows another shape of the reproducing needle portion
in the embodiment shown in FIG. 7 T FIG. 9 shows another shape of the reproducing needle
portion used in the present invention. is there. ■ Light source 2 mirror 3.17 V lens 4 plateshaped recording medium 6 reproduction needle 7 optical waveguide 12.24 optical fiber 13
cantilever 14 arm 15 ′ ′ ′ ′ ′ t.
16 photoelectric conversion device 18-one f mirror 19 light directional coupling circuit 弁 1)
Toshiyuki 15 in the 1st port EndPage: 4 years of age δ figure / f70EndPage: 5 list of attached
documents (+) statement 1 Communication (2) Drawing] Communication (3) 9 baby letters]
Communication (4) Holding / 1 application 1 duplicate 1 applicant Inventors other than the
above, patent applicants or agents Address same as above Name 1) Makoto-EndPage: 6
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