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JPS5168201

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DESCRIPTION JPS5168201
Dec. 1974 IO Patent Office Secretary 1 Title of Invention (Ii) Discrimination Examination Request
1jil [Phase] Japan Patent Office Nichi-ichi ? JP-A-51-68201. . "Mini 7-" и и и Description 1 title of
the invention 1 title of the invention stereo signal recording and reproducing system 2-* * Get
the sum and difference signals of the stereo left and right signals Means, means for frequency
modulating the difference signal, means for mixing the sum signal and the frequency modulated
difference signal, means for limiting the wave front of the output signal of the mixing means, and
output from the limiting means Recording means comprising means for forming a depression
corresponding to the rectangular wave on the surface of the recording disk, and irradiating the
depression with a laser beam to emit a signal corresponding to the depression based on the light
diffraction. A flat noodle to obtain the difference 4M through the detection means, the means for
obtaining the sum signal by passing the output of the detection means through the low pass filter
VC, and the output of the M detection means through the high pass filter and the demodulation
means. , The sum signal and Stereo signal recording and reproducing system for 1 playback
device and comprising a means for obtaining a stereo left signal and right signal from the signal.
The present invention will be described in detail for a stereo signal allocation reproduction
system. 1 1 E 1 Figure is a block diagram showing the recording device, in this figure 1 normal
stereo left and right signals! It is converted into a sum signal and a difference signal in the trick
path 11. This sum signal passes through the tree emphasizing circuit 12 to obtain an output
having a waveform shown by the clock circuit EndPage: 1-- 1- @ 2 WJd. The wave height is
limited by this output beam 11 edge circuit 14 to obtain a rectangular wave as shown in l12tli'e.
This rectangular wave is sent to a drive circuit 15 of an apparatus for forming pits described
later, and a rounding planer generation circuit 18 for providing a blank portion between each
program of stereo signals is provided-this will be described later It is for program search. I on the
light surface of the recording disc made of soft or hard plastic! ! It responded to the square wave
shown in 2 @ e. 21st! An arrangement of very small dimples (see the enlarged view in FIG. 3) of
oval shape as shown in Iff is formed by appropriate means. The row of pits (pits) spirally
connects from the inner periphery of one disk to the outside to form a signal track. How wide is
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the pit? The length and interval are changed as shown in 25th Klf. The width of the pits is, for
example, about OB micron length and spacing is about 0.4-ols micron, and the depth is about
016 Miktan.
Also, the center spacing of the adjacent signal tracks is 2 microns, ie 11 the formation of this pit
can be done by various means, but it is done eg by using a laser beam. First, on a master for
recording, a photoresist coated on glass is turned on, and an optical system is used to expose a
laser beam on a flat master surface. The photoresist original disk that has received the laser
source is melted to form pits by developing only by developing. и If this laser beam is modulated
with the above rectangular wave (Fig. 12e), pits corresponding to rectangle RK (IL2 figure f) is
obtained. In this way, a master plate is made, 1) As in the case of normal LP and record disc
manufacture, by performing electroplating on this, a stamper is formed and a large number of
disc powers S are produced in a press case. The disc in which the pits are thus formed is
reproduced, for example, as shown in FIG. Circle in this figure! The # 41 is set so that the surface
on which the pit is formed is on the lower side. Helium neon laser-Km device is placed under one
disc 41 @. The laser beam emitted from this point is a prism 44. The base surface of the P board
41 (focused) through the mirror and rotary mirror 43 and the objective lens 42. This light beam
is reflected by the back surface of Pw L41, and is guided again through a lens 421 and a mirror
431 mirror and a prism 42 to a photodiode 45 connected to the photodiode. In this return light
beam t & disk 1 the surface condition, that is, the presence or absence of pits is different, and in
the case of pits with pits, the amount of light of the 2 reflected laser beam becomes very small
due to the diffraction of light 1; After that, the pits are captured by the photo diode. The laser
oscillator, the optical system, and the detection system are mounted on a single frame, and the
frame is moved to rotate in the radial direction with the rotation of the disk 410 into a spiral bit
train of the disk 41. % To follow. In this way, according to the 9 bits detected, the round band is,
for example, a 4-reproducer i1 # c-1 as shown in the srs diagram, and the output signal of the
low bus filter 52 is a sum signal of # (shown in FIG. ), This is input to the matrix circuit U ? via
the D-emphasis circuit. The output L of the high bus filter 55 is an FM-trained difference signal
(see FIG. 2): when it is perplexed by the FM recovery pJ hearing, a difference signal v (the z.sup.a)
is obtained, This is used as a circuit circuit 57 in a matrix and is matrixed!
Send to 54 The logic circuit 54 obtains stereo left signal and right signal from the sum signal and
the difference signal. The output signal of the filter 55 is also available. Program inspection> It is
sent to the inspection circuit (not shown) for engineering purple. Good. Note that in the block
diagram of Fig. 111 and Fig. 5, the matrix circuit, the pre-emphasis circuit, and the de-emphasis
circuit are the same as those used in a normal high-speed stereo broadcasting system, and
EndPage: 2 According to our recording / reproduction system, it is possible to make about 500
tracks at an interval of 181 on the recording disc, so that a normal stereo signal can record a
very large amount of information of about 1 hour. Since a stereo signal for a long time can be
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recorded on a disk of a disk like this, it is necessary to be able to select all desired programs
freely by searching. Therefore, planer generator circuit CwLI diagram) ve 1 As shown in FIG. 6, a
track consisting of a blank portion between the program track and the program track (or n + 2 in
FIG. 6) Tracks) are formed. In this way, the detector can be moved in the radial direction of the
circle 841 to detect blank tigers and glues, and it is possible to search for any 1cI graph J by
determining the number of blanks to which it will go. It becomes. ? fIvc F F! A long-time stereo
program with high fidelity and aT ability to record, and a recording medium port, like a normal
LP record disc, can be mass-produced. While it was F, but the water valve was limited to the
above example? It will be 9 white that it is not the purpose to be
4, a brief description of the drawings v1 Figure shows the recording device according to the
embodiment of the back of the wood [F] 1 w-2 is a waveform diagram showing each signal
waveform of Figure 11, early 3 is on the disk Fig. 1 is a schematic oblique view showing the
optical system for reproduction. jF, Fig. li [5 is a block diagram showing the reproduction
apparatus according to the invention 1 of the present invention, v6a? 11 is an illustration
showing the arrangement of signal tigers, 11.4 ........ matrix circuit 18... Blanker generation circuit
41. ... Objective lens 43.
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Detector 52 и 0100. ????????????????? High
pass filter base 57 De-emphasis circuit M matrix circuit FM circuit applicant Kansai Television
Broadcasting Co., Ltd. Eye j 'ciO 00000000000 vt Figure Other proxy agent EndPage: ?
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