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United States] 97] March 22 1266'78 No. 2 Original patent indication display r I + Sho 47-28445
(original application date Mar. 21, 1974) 3 ° Inventor's address United States of America
Pudding, New Jersey 7 ton party fist Zakuru 50 ■ JP 50-1.552030 published Nissho 5Q, (1975)
12.1.5 ■ 昭,! [0-373'7 rho [phase] Application dated Japanese, 47. (197? 、 、 整理 / 整理 整理
庁 名称 1 、 Name of the invention
A needle used to reproduce high density information recording discs
3. Detailed Description of the Invention The present invention relates generally to a novel
reproduction needle for high density information recording material, and more specifically, the
information recorded on the disk is changed in the form of change of capacitor. It relates to a
reproduction needle in the form of an ejection. It has been conventionally considered for low
density recording materials that the recording information is reproduced using capacitor change
obtained by cooperating the recording material with the pickup electrode of the reproduction
apparatus. U.S. Patent Nos. 1.580,112 and 1. for recording formula. 715, 863, No. 1, 859, 551,
U, 89], 780, 2.3, Renal, 2'i'39- and 2,422, 140. It is possible to realize a video signal recording
medium with a reasonable production time and a low cost in a powdery and convenient manner.
According to one embodiment of the invention, the video signal recording body is a disc having
spiral grooves, the reproduction of which is 7 /) circles. It takes place by means of a device
having a pick-up needle which rests on the vortices of the board. The information track at the
bottom of the groove has a geometry which varies according to the information to be recorded.
The instantaneous center position of the groove does not change with the information recorded.
Rather, the spacing between the centers of adjacent ones of the spiral rings is substantially
constant, and the spacing between adjacent ones can thus be reduced. The tip of the needle has
an insulating sidewall shaped to be received in the groove EndPage: 1 in close contact with the
smooth curved side wall of the disc groove, which has a constant width over its entire length.
When relative movement between the groove and the needle occurs during the regenerating
operation (for example, by the rotation of the turntable supporting the disk), the needle enters
the groove and the bottom of the groove Pass over information track elements of varying
geometry. These elements do not mechanically affect the needle, but rather change the
capacitance generated between the conductive electrode embedded at the tip of the needle and
the reference conductor (eg the conductive surface of the disk support turntable) The electric
circuit incorporating this changing capacitance changes into one change of this capacitor 1 tfelectric signal during regeneration. This electrical signal is used to visually display the recorded
information. This electrical circuit comprises, for example, a resonant circuit which contains the
changing capacitance of the recording body and is subjected to a RIt "excitation of a frequency
which is suitably higher than the frequency of the recorded signal, and means for detecting
changes responsive to such gF excitations. It is what has
() According to the principles of the invention, it is desirable for the pick amp needle to contain:
(a) a conductive electrode facing at the exposed surface area of very minute dimensions at the
groove bottom during regeneration, The dimension (transverse width) in the direction crossing
the groove is about the track width, and the dimension (thickness) along the direction in which
the groove is cured is sufficiently smaller than the above-mentioned lateral width-of the recorded
high frequency video signal (B) Insulating side walls which are well in contact with the side walls
of the groove and which have the necessary mechanical properties for the assembly, and which
have the necessary mechanical properties suitable for decomposing changes; Support made of
insulating material for conductive electrodes. The disc is made of a thermal pJ plastic material
such as vinyl used for example in phonograph records, so grooving of this material and forming
of information tracks of varying dimensions into grooves is for phonographs It is possible to do
with the mass duplication technology similar to the record 7 tamp work in the record
manufacturing industry. An example of the shape change pattern used to change the shape and
dimension of the groove bottom is a shape in which the thermoplastic material of the groove
bottom is made uneven corresponding to the recorded information. The dielectric constant of the
thermoplastic disc material is thicker than that of air (3), so that the capacitance generated
between the surface of the needle electrode and the reference conductor (eg turntable) during
the regenerating operation is determined by the surface of the needle electrode The recessed
area, which is larger when the needle electrode is located at the bottom of the groove ("is
located"), than when it is located above. Therefore, when relative movement between the vortex
and the needle occurs, the needle electrode is in 11-next contact with each of the different
uneven areas in the groove, so that the capacitor change representing the recorded information
also corresponds to 7t. It occurs continuously. -The object of the present invention is to provide a
novel high density information recording body 414r for N reproduction. The objects and
advantages of the present invention will be readily understood by those skilled in the art from
the attached drawings and the following description. FIG. 1 shows that the tip of the pick
amplifier needle 10 having the embedded conductive element 20 is fitted in the groove 15 of the
recording medium 30 (that is, a part of the spirally grooved disk). There is. The relative
movement direction of the groove 15 with respect to the needle 10 during the reproduction
operation is perpendicular to the plane of the drawing! In the direction of +1. The tip of the
needle is supported by the side walls 12 and 14 of the groove 15 and the ridges 50 and 60 form
a boundary of the above-mentioned groove portion to separate adjacent spiral grooves. The
electrode 20 is positioned to be directly above the information track 75 at the bottom of the
groove 15.
According to an example of the change in the shape and size of the groove bottom, the
information track 75 is one in which the height of the groove bottom is changed in the
longitudinal direction of the groove 15 (see the longitudinal sectional view of FIG. 2). As a result,
the size of the gap 40 between the electrode 20 and the track 75 changes complementarily. In
the example of FIG. 1, the width of the electrode 20 substantially corresponds to the width of the
information track 75 of the groove 15. Matches. The thickness at the exposed tip of the electrode
2o (see FIG. 2) is sufficiently small to be able to distinguish the required minimum change of the
information track. As shown in FIG. 2, the needle 10 is supported by the side walls of the groove
in such a way that it does not provide mechanical interference to the needle as the elements of
the information track 75 pass under the tip of the needle 10. ing. However, a problem that can
occur with EndPage: 2 nodes when passing track elements used for reproducing recorded nstates appears between the electrode 20 and a reference conductive region placed under the disk
30, for example. change in capacitance. For example, the reference conductor is provided to
support and rotate the disk 30 and also has a conductive color surface of the turntable. The
dimensions of the needle electrode 2o and the spiral disc groove 15 are selected, for example, as
follows. The width of the electrode 20 is 5 m, the thickness is smaller than the above-mentioned
width, for example], and the pitch of the grooves is 2. 1 per 2.54 cm (1 in 4.1 h). : A ratio of 400
books. With this dimension, for example, if the rotational speed of the disk is calculated as 600 r,
p, m, it is 31.75 centimeters (12,5 inches) with the highest wave number change occupying a
groove length of 2.5 microns per change wavelength A signal frequency of up to about 4
megacycles can be reproduced with a single sided playing time of about 10 minutes from a
diameter disc. . Of course, other combinations of buff meters may be used, for example, if disc
rotation is required. The improvement and modification of the recording and reproduction well
device described in detail in this document is described in detail in Jn "'"'--One-wing JP-A 50155203 + 3). See above for a practical example of recording material cutting technology that is
applied to the production of stamp masters suitable for mass production of discs 30. In
particular, refer to the scanning electron microscope 4 for the master making step and the
recording method of the information token at the bottom of the groove related to FIGS. 9A to 9F
of the above. ・1′! Corner? Figure 3 is a top view of the record player used for zeroing the
disc 30 in Figures 1 and 2. The V% frame is the disc support turn tape / L'31 (only one part The
pick-up arm 106 is housed in a shielded container 104, having a turntable increaser with a drive
motor (not shown) and a drive mechanism (not shown) for rotating the This pickup when the
device is not working!
It is placed on the centering bracket 10'7 of the 0 arm. The needle 10 is attached to the pickup
arm 106 by means of a needle cap 10B. The needle 0 contacts the disk 30 through the opening
109 opened in the shielding container 104. The electrical connection to the electrode embedded
in the needle is made by the flexible conductor 110, which is made of beryllium copper, for
example, and the pick-arm 106 is LliJ-fed to the groove speed error bearing 1 structure 125. A
telescopic pivot assembly 120 is added, and this pivot assembly allows the pick-up arm 106 to
move longitudinally; in either direction; as well as laterally. The enclosure 104 and the pick-up
arm 106 are driven by the drive shaft 130 so that the needle 10 can follow the groove 15. This
shaft is then engaged by means of a shielded container 136 with an engaging structure 135
coupled to the container 104 described above. This drive shaft 130 is described in detail in the
Clemens' application filed for punishment. It can also be coupled to the drive mechanism in a
manner that is flat. In operation, the shield container 104 accommodating the pickup-arm 106
hangs the recording medium by the drive shaft 130 and follows the movement groove 15. The
pick-up arm 06 is supported floatingly on the disc 30 by means of an 'ill +' flexible pivot and a
flexible conductor 110, so that the needle 10 can also follow the deflection of the surface on the
disc, eg strain. The wedge speed error 1 mechanism 125 is driven by a signal from a circuit
(described later) shown in FIG. 4, and is caused by the change in speed of the turntable, the
eccentricity of recording and other speed errors of seven. The pick-up arm 106, the aM container
104 and the drive mechanisms 130-136 can, in certain applications, be relatively long and
lightweight so that they can pivot on the turntable's substrate in much the same way as the voice
pick-up arm. Pickup A EndPage: 3-M can be substituted. For example, an inductor 45 45 in which
the element 2 o is coupled 9 can be mounted on the circuit board 140, which can also house a
part of the shielding container 104 and the electric circuit of FIG. 4. Other circuit components are
also attached to the circuit board 1401 without Z affecting the weight of the needle 1 o because
the pickup and arm unit 06 are kept in a floating state of their own and are not engaged with the
shielding container ring W. I can do it.
The standard follow N amount (tracking weight) applied to the needle is 1 crumb or less. FIG. 1 is
a schematic block diagram of a portion of an electrical circuit used to process the capacitance
changes that occur in the curvature of element 20 and the reference conductor during
regeneration operation of disc 30 and to generate the desired output signal. It is a circuit
diagram. This circuit can also be used, for example, to generate an amplitude modulated carrier
signal that is applied to the antenna terminal of a television receiver to provide television display.
In FIG. 4, the variable capacitor 200 represents the gear paste 7 between the electrode 2o of the
needle and the reference conductor (referred to as the pull 3) during the regenerating operation
of the disc 305. 11, and the brass brit 2o is the conductor 11o. It is connected to the interleaver
145 (also shown in FIG. 3). The peak detection circuit 155 is in contact with the tap 1a 9 of the
inductor 145J. Circuit 155 illusion, F-o F 157, and a rejection-T 156 and capacitor 158 coupled
between the terminal on the diode (in the sword far from the junction of the diode and the
inductor 14-5) and the ground. It consists of a parallel n □ combination. Capacitor 358 is shown
as a lumped element, but is simply the sum of the stray capacitance of the lead and the input
capacitance of the preamplifier. The second tap 147 of the inductor 47J- is grounded. RP
oscillator 150 applies a radio frequency signal to inductor 145. The preamplifier 160 is
connected to the peak detection circuit 155 and produces an amplified video signal at its output.
The turns .mu.-elements 145.155 and 160 can be mounted in the shielding vessel 104, in
particular in the vicinity of the pick-up electrode in order to reduce stray resonances. This is
shown in the figure by the dotted lines surrounding these circuit elements. The output of the
prescaler T17 = device 160 is connected to the amplifier 170 to be sensed 1, f and to further
amplify the signal there. The outputs of the scaler 70 are connected to A, M, a modulator 180
and a sync separation circuit 190. The output of the sync separation circuit 190 is connected to
the 4T separate circuit 210. The output of the discriminator circuit 210 is connected to the
groove speed correction circuit 125 shown in FIG. The oscillator circuit 220 generates a carrier
signal which is modulated by the signal information from the amplifier 170 applied to the
modulator 180. The amplitude modulation carrier wave from the modulation circuit 180 is
supplied to, for example, an antenna terminal of a television receiver.
In operation, the RF oscillator 150 applies an excitation voltage to a resonant circuit consisting of
the junction capacitance of the capacitor 200, the inductor 145 and the diode 157 and the stray
capacitance 158. The inductor portion between the RF oscillator 150 and the terminal 147
operates as a one-turn transformer to supply an RF excitation signal to the solution circuit. The
resonant frequency of this circuit changes the amplitude of the excitation voltage on the
capacitive side. The queue (Q) of the resonant circuit is chosen to exhibit a voltage-frequency
curve with a sufficiently steep slope so as to produce a signal amplitude change at the tap 149 of
the inductor 145 which has been temperature-measured by the peak detector 155. However, this
○ must also be chosen so that the resonant circuit exhibits a band width that is also suitable for
I. The oscillator 1500 frequency is scraped to one side of the frequency response curve of this
resonant circuit, and when the resonant 6 frequency of the resonant circuit changes by the signal
-9%, the period of any signal state, the bias of the medium resonant circuit It is necessary to
choose to remain on the slope of the above-mentioned side of the transfer frequency response
curve. As the element 20 follows the groove 5, the capacitance 200 changes in accordance with
the recorded information. This change in capacitance changes the resonant frequency of the
tuned circuit. "If the resonant layer e 変 化 changes from EndPage: 4 in which a constant
frequency Baine signal (from the oscillator 150) is applied to the above circuit"-"No as ti wave
number of the circuit (a response to Varying as a function of the information recorded, this
results in an amplitude modulated output signal at terminal 149. The peak detector 155 detects
these .zeta.-width changes by means of the diode 157, and a filter network consisting of a series
and the capacitor 15B eliminates the frequency component of the frequency information of the
noon information. The 4> ”signal from the detector 155 is supplied to the fs amplifier 160. This
chip can also be typed into the signal (shielded container) 04 to reduce noise interference. The
output signal from amplifier 60 is then applied to a second amplifier 170 for further
amplification. The synchronous distribution 2 circuit 190 is a composite signal 8! Of the
amplifier 1170 for the horizontal synchronization. It is separated from one force, and this pulse
is supplied to the discriminator circuit 210. The discriminator circuit is designed to generate a
control voltage when the synchronous J + commons from the separator 19Q is changed from the
rated horizontal velocity by the change in groove velocity.
Thus, the synchronization signal frequency records a pilot sound on the disc), and this sound
controls that the recorded synchronization signal frequency has deviated from its original value
due to groove speed errors. It is detected by a discriminator circuit 2 which generates a voltage.
The control signal from the discriminator circuit 210 is applied to the mechanism 125 of FIG. 3
and described in detail in the phase direction of the pick-up threat 7- in the direction of canceling
out differential speed errors. The knowledge signal from the −4'-4 amplifier 170 is also applied
to the amplitude modulation circuit 5180. Oscillator 220 has a frequency selected to coincide
with one of the television receivers 1 (the channel's UHF or VH'F channel, and is amplitude
modulated by the video and synchronization signals from amplifier 170. Supply a carrier wave to
the The amplitude modulated signal from stage 180 can be fed directly to the tenna terminal of a
standard television receiver. The receiver can then display the recorded video signal.
4. Brief description of the drawings 1, FIG. 1 shows the contact between the side wall of the
groove of the disk having an information track at the bottom of the groove during reproduction
and the tip of the needle according to the invention and of the principle of the invention FIG. 2 is
a longitudinal sectional view showing the relationship between the groove of the recording body
of FIG. 1 and the needle point contained in this groove during the reproduction operation, FIG.
FIG. 4 is a top view of the reproduction apparatus using the needle and disc recording material of
FIGS. 1 and 2 according to the principle of the present invention, FIG. 4 (FIG. 5 according to the
principle of the present invention Figure 1 shows a block diagram of one of the electrical circuits
used to handle the change in capacitance that occurs in relation to the relative movement of the
wedge and the groove during operation. -30 ... Disks constituting recording medium, 15 ... One
groove of rainbow spiral i 1 e, 750-information track, 12.14-Side wall of addiction @ mosquito
ring, 10 ... ij, 20 ..・ Conductive type bar. Patent applicant Earl Seaney Corporation agent Shizuru
Shimizu has two people EndPage: 5), end; 2 '6, list of attached documents (1) specification 1 (2)
figure' side '1-(3) commission Letter and its translation (omitted because it does not require a
change) (4) Priority certificate and its translation each differ by 1 (replacing additional pages) (5)
request 1 copy (6) application examination request 1 1 7 Non-agent address Kobe City Tsukaikai
Kuoi Dori 7-chome 4-14-EndPage: 6
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