JPS5264919

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DESCRIPTION JPS5264919
2, inventor's address New Jersey River specification [US] [Japan] Patent Office of Japan ■ JP-A52-6491.90 Published Japan. (1977) 5.28 持 昭 屹 λ 相 [相 相 相 相 相 相 相 197 197 (/ (197 Q
/ /, zz examination request (all U page) Office internal reference number 7 line Title of the
Invention Printed Circuit L Comprising a Third Conductor
Disc record playback device
3. Detailed Description of the Invention The present invention relates to a pickup circuit for a
disc record reproducing device, in particular, to a groove of the disc record in a reproducing
device of the type described in the above-mentioned U.S. patent in U.S. Pat. No. 3,842,194. The
mounted regeneration needle is mounted on the record and supports an electrode which forms a
capacitance with the conductive coating. This Record EndPage: 1-b reproduction inter-needle
volume is made to change by the fact that the geometrical change (change in size and shape) of
the groove bottom representing the recorded information passes under the reproduction needle.
An apparatus for converting capacitance changes representing information into electrical signals
is described, for example, in US Pat. No. 3,872,240. In the device of this patent, the pivoted
support arm for the regenerative needle is formed of a conductive material and is electrically
connected to the regenerative needle. The conductive support arm is formed of a conductive
material and forms an arm housing transmission line that surrounds the tsuko no arm. This
transmission line is terminated at the end of the arm opposite to the regenerative needle side
with a capacitive load due to a series connected capacitance including an air capacitor and a
voltage variable capacitor. The transmission line and the associated capacitance form a tuned
circuit having a resonant frequency that changes with the change in capacitance between the
playback needle and the record. This tuning circuit is preferably powered by a UHF oscillating
signal from a fixed frequency oscillator operating at a frequency (eg 915 MHz) in the band
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allocated for SM (industrial, scientific and medical). The operating frequency of this oscillator is
slightly offset from the range of variation with respect to the resonant frequency of the tuning
circuit. When the resonant frequency of the tuning circuit changes, the resulting amplitude
change of the UHF oscillation signal is detected, thereby reproducing the recorded information.
According to the above-mentioned U.S. Pat. No. 3,872,240, a good signal regeneration device is
provided, while on the dimensions and shape of the arm due to the electrical parameters imposed
on the regeneration needle support arm. Limits are imposed on it, which limits the mechanical
function of the arm. Furthermore, it has been found that it is difficult to make adjustments to
obtain the best performance in a repeatable manner suitable for mass production of
regenerators. According to the invention, the transmission line forming the resonant circuit with
the regeneration needle-to-record volume is formed independently of the regeneration needle
support arm using printed circuit technology which can be accurately controlled.
The electrodes of the regenerating needle are connected to a conductor formed by sterilizing the
shape and shape on a printed circuit board housed in the conductive arm housing and forming a
transmission line therewith. The transmission line is terminated by capacitive means coupled to
the end of the conductor opposite to the regenerative needle side. Such capacitive means include,
for example, a tuning control varactor diode of the type described in the aforementioned U.S. Pat.
No. 3,872,240. Except for the electrical function, the regenerating needle support arm has, for
example, an arrangement as described in Japanese Patent Application No. 5 / 108,708 (US
Patent Application No. 667.307). The connection between the regenerating needle electrode and
the printed circuit board is made by a conductive spring attached to the regenerating needle.
This connection can be made as described in the above-mentioned Japanese Patent Application
No. 51-108708. The effective length of the transmission line is determined by the combined
length of the conductive spring and the printed circuit board conductor. An input circuit
providing a UHF oscillating signal of a desired frequency (preferably in the ISM band) is
inductively coupled to the transmission line. The amplitude modulation detector is used to
control the size and shape and spacing on the same circuit board. The second conductor is
spaced relatively small from the transmission line conductor to provide a relatively tight coupling
between the output circuit and the transmission line. On the other hand, a relatively loose
coupling is provided between the input circuit and the transmission line by a third conductor
arranged relatively far from the transmission line conductor. The third conductor can be formed
on the circuit board with controlled dimensions and constant spacing (or control) using printed
circuit technology, or a loop of wire mounted on the circuit board The interval may be adjusted
(to control the amplitude of the oscillation signal). By using the above-described coupling
relationship, the shape of the resonance characteristic curve of the resonance circuit formed by
the transmission line and the capacity between the regenerative needle and the record, etc., the
length EndPage of the second conductor: 2 and the distance from the transmission line
conductor The desired shape can be obtained by appropriately selecting. The input circuit
derives its UHF oscillation signal, for example, by inductive coupling to a tank circuit of a UHF
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oscillator located in the arm housing. It is desirable that the coupling of the oscillator to the tank
circuit be loose so that only a small load is applied to the oscillator, so that it can be operated
with a large Q for the tank circuit, so that Spurious frequency modulation of the oscillator output
can be prevented.
The plan view of FIG. 1 shows a printed circuit board consisting of a flat substrate 13 of
dielectric material. The substrate 13 is provided with a conductive coating only on selected areas
15.192.23.7.3.14.43.47.49 and 53 of its-main surface. In one embodiment, the printed circuit
board is formed of a glass-filled Teflon (e.g. fluoroglass-Fluorglas E 600/1-07 sold by Atlantic
Laminates-At1 antic Lam nates-) and is constituted by a copper coated substrate 13 ing. Optical
techniques are then used to set the size, contour, position and spacing of the surface area of the
substrate on which the copper coating is to remain. The first conductor 15 is formed by a
conductive coating of the elongated surface area of the substrate 13. Between one end of the
conductor 15 and the conductive pad 19 is fitted a slot in the substrate 13 arranged between the
capacitor 17 (for example, one end of the conductor and the covered surface area constituting
the conductive pad 19) Are electrically coupled by a trapezoidal shape installed on the printed
circuit board. The conductive coatings on the peripheral surface area of the substrate 13 on
either side of the first conductor 15 form ground pads 23 and 45, respectively. A varactor diode
21 is connected between the connection pad 19 and the ground pad 23, while a resistor 25 is
connected between the connection pad 19 and the bias input pad 27. The bias input pad 27 is
formed by a surface area provided with a conductive coating adjacent to one end of the ground
pad 23. In a slot formed in substrate 13 between adjacent portions of pads 23 and 27, a
capacitor 29 (e.g., the same shape as capacitor 17) is disposed. As an example, the diode 21 and
the resistor 25 (shown schematically in FIG. 1) are mounted on the underside of the substrate 13
with the leads inserted into the positioning holes provided in the substrate 13. A second
conductor 41, spaced from and substantially parallel to the first conductor 15, is electrically
conductive on an elongated surface area relatively close to and substantially shorter than the
surface area covered by the conductor 15 It is formed of a coating. Another elongated area of the
substrate surface perpendicular to the conductor 41 'is coated to form conductors 43 and 47,
respectively. The conductor 43 connects one end of the second conductor 41 to the ground pad
45 and the other end of the M 41 to the connection pad 49.
A detection diode 51 is connected between the coated surface area forming the connection pad
49 and the output pad 53 formed of the conductive coating of the surface area close to one end
of the ground pad 45. In the slot formed in substrate 13 between the adjacent portions of pads
45 and 53, capacitor 55 (for example, as described for capacitor 17 isomorphic to capacitor 17
(9) and resistor 25), substrate 13 Mounted on the bottom of the A third conductor 36
substantially parallel to the first conductor 15 is disposed on the side of the conductor 15
opposite to the conductor 41 side. The distance between the conductors 36 and 15 is greater
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than the distance between the conductors 14 and 15. As shown in FIG. 1, this third conductor 36
is configured at the center of the loop 35 of conductive wire. The loop 350 legs perpendicular to
the conductor 36 are attached to the printed circuit board in such a manner as to support the
loop so that the spacing between the loop and the surface of the substrate 130 can be adjusted
to adjust the spacing between the conductors 36 and 15 ing. The end of one leg is connected to
the ground pad 23 and the end of the other leg is connected to a UHF input pad 37 formed of a
conductive coating on the peripheral area of the substrate 13. When the apparatus of FIG. 1 is
used in a pickup circuit of a disk record reproducing apparatus, the substrate 13 is mounted in a
housing formed of a conductive material. For example, this housing is comprised of an arm
housing of the general type described in the aforementioned U.S. Patent No. (lO) EndPage:
33.872,240. An arm housing of this type forms a support envelope for the pivoted pick-up arm
holding the playback needle, which envelope substantially corresponds to the record groove
portion in which the arm is being played back during the playback operation. In order to keep it
on a tangent, it is made to move in the radial direction of the record. However, in a pickup
apparatus adopting the principles of the present invention, the pivoted pickup arm is described
in the aforementioned U.S. Pat. No. 3,872,240 (and U.S. Pat. No. 3,872,265) Unlike the case of
being used in the pickup system, its electrical function (function of forming a transmission line) is
not required. Rather, the pick-up circuit is formed substantially independently of the pivoting
pick-up arm. (And, this pickup circuit is described, for example, in the description of the
conventional example in the aforementioned US Pat. No. 3,842,194, US Pat. No. 3.1372.265, US
Pat. No. 3,806,668). It also shows the features of the pickup system being used.
(11) When mounting the substrate 13 in the housing, connect the ground pads 23 and 45 to the
conductive surface of the housing (for example, solder to the adjacent housing wall surface)
while outputting from the conductive surface of the housing And means for securely separating
the input pads (e.g., by providing an opening in the area of the housing wall adjacent to these
pads). The electrical connection between the capacitor 17 of the conductor 15 and the opposite
end of the conductor 15 and the electrode of the regenerating needle (for example of the type
described in the aforementioned U.S. Pat. No. 3,842.degree. 194) To be done. The conductor 15
and the effective extension provided by the regenerative needle lead 33 form a transmission line
with the conductive envelope. This transmission line is (a) at one end by a series connection of 6
with the capacitance exhibited by the capacitor 17 and the varactor diode 21 mounted in the
slot, ω) at the other end, the geometrical change of the record groove bottom under the
regenerating needle Is terminated by the capacitive load due to the variable regenerating needleto-record volume (12) that appears between the regenerating needle electrode and the record
conductive coating as it passes. (The varying playback needle-to-record volume is as described in
the aforementioned U.S. Pat. No. 3,872,265, the conductive arm housing's lower surface closely
covering the record and the conductive coating of the record Appear in series with the relatively
large capacity that appears between The tuning circuit formed by the transmission line and the
terminating load capacitance has a resonant frequency that varies over a range of frequencies in
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response to the change in capacitance between the needle and the record. By changing the
reverse bias voltage applied across the varactor diode 21, fine tuning of the tuning range settings
described above can be performed. Rather, bias input pad 27 is connected by bias input lead 31
to a suitable variable bias source. This variable bias source is described, for example, in U.S. Pat.
It is desirable to configure an auto-tuning circuit of the type described in g40 so that the setting
of the tuning range is automatically adjusted to ensure proper signal regeneration. The pickup
operation of the device shown in Fig. 1 will be described. (13) UHF HF Rikalead 39HF HF Baka
Pad 3 UHF preferably having a frequency within the 18 M band (e.g., 915 MHz for use in the
U.S., as described in U.S. Pat. No. 3,872,240). Connect to the source of the oscillating signal to
energize loop 35.
The UHF oscillating signal is provided to the tuning circuit by inductive coupling between
conductors 36 and 15. The center of the tuning range (e.g., 910 MHz) is slightly offset from the
frequency of the UHF "oscillating signal source. Therefore, the frequency of the UHF oscillation
signal source will be located on the slope (for example, the upper slope) of the resonance
characteristic curve, and in accordance with the change in capacity between the regeneration
needle and the record, this slope is effectively It will move up and down along. The conductor 41
is inductively coupled relatively tightly to the transmission line conductor 15 so that it is
energized with a UHF oscillating signal that varies in amplitude according to the position on the
slope of the UHF oscillating signal source frequency. That is, when the capacity between the
reproduction needle and the record changes, the resonance frequency of the tuning circuit
approaches the frequency of the oscillation signal source (14) EndPage: 4 thereby, the response
characteristic to the oscillation signal of the tuning circuit becomes In other words, the amplitude
of the oscillating signal coupled to conductor 41 changes. The envelope of the amplitudemodulated UHF oscillation signal supplied to the conductor 41 is detected by the detection diode
51 connected to the conductor 41 through the connection pad 49 and the conductor 47 and the
capacitor 55 acting as a detector filter capacitor. This detector is fed by an output 57 connected
to the output pad 53 to the input of processing circuitry suitable for processing the recorded
information. See, for example, US Pat. No. 3,969,756 for an example of the coded form of the
recorded information and an overview of its processing circuitry. FIG. 2 shows another
embodiment of the invention, which is a modification of the device of FIG. This figure is a
perspective view of a printed circuit board structure mounted in a chamber in a conductive
housing where the wall has been partially removed. The printed circuit board of FIG. 2 is a flat
substrate 13 'of dielectric material in which a conductive coating is provided only on specific
portions (15, 23, 36', 37.41.43.45) of the main surface. It consists of The substrate 13 'is made
of, for example, the same type of material as described for the substrate 13 of FIG. 1 (15), but its
shape is different from the rectangle of the substrate 13 of FIG. A protruding portion is provided.
As in the case of FIG. 1, the pattern of the conductive coating left on the substrate 13 'is
substantially parallel to the elongated first conductor 15 and the conductor 15 of this case, but it
is not so small. And two conductors 41 are defined. One end of the conductor 15 terminates in a
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slot in the substrate 13 'in which a capacitor 17' (shown as a disc in this figure) is
accommodated.
The other end of the conductor 15 terminates on the central projection of the aforementioned
substrate 13 'and is provided with a terminal 16 (illustrated as a rivet embedded in the substrate
13'). As in the case of FIG. 1, one end of the second conductor 41 is connected to the peripheral
ground pad 45 by a conductor 43 disposed at a right angle to it. Also, as in the apparatus of FIG.
1, the conductive coating on the peripheral area of the substrate surface opposite to the
peripheral area side forming the ground pad 45 of the conductor 15 forms a second ground pad
23 doing. (16) As in the case of FIG. 1, the varactor diode 21 is connected in series with the
capacitor (17 ') between one end of the conductor 15 and the ground pad, but in this
embodiment, the diode 21 is mounted over the conductive coating of the substrate 13 'by
soldering one lead directly to the plate opposite the conductor 15 of the capacitor 17' and the
other lead to the ground pad 23 Be The biasing of the diode 21 is performed through an element
mounted above the substrate, illustrated as a choke coil 24. One end of the choke coil 24 is
directly soldered to the same electrode plate of the capacitor 17 'as described above, and the
other coil lead is a hole provided in the chamber wall 6o of the conductive arm housing 1
housing the printed circuit board. Are connected to a variable bias source (not shown). By way of
example, the leads of the coil 24 are attached to the holes of the wall 60 (and pass through
through capacitors (not shown) with a bias voltage offshore function similar to that of the
sapphire 29 of FIG. 1) Through this hole. Also on the coated surface of the substrate 13 /, one IJ(17) is soldered to the end of the conductor 41 opposite the conductor 43 and the other lead is a
hole in the housing chamber wall 61. Through the input of the signal processing circuit (not
shown)! , And a detection diode 51 extending at. The lead of this diode passes through the hole,
for example, through a feedthrough capacitor (not shown) attached to the wall 61 (and
performing the detector filter capacitor function of the capacitor 55 in FIG. 1). A UHF input lead
39 passing through another opening in the housing chamber wall is formed of a conductive
coating on the substrate surface area on the same side of the conductor 15 as the UHF oscillating
signal source (not shown) with respect to the conductor 15 Connection pad 37 is connected. The
elongated surface area extending between the pads 23 and 37 is provided with a conductive
coating forming a third conductor 36 '.
The third conductor 36 'is substantially parallel to the first conductor 15, but the spacing is made
much larger than the spacing between the second conductor 41 and the opposite side of the
conductor 15. Figure 3 is a side view of a portion of a video disc player that is suitable for
playback of video disc records of the type described in US Patent 3,842,194 18) In order to show
the positional relationship during the regenerating operation of the printed circuit board shown
and the pickup circuit element related thereto, a part is shown removed. In the illustrated
reproducing apparatus, the turn tape / l / '71 is rotatably attached to the motor mounting plate
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73. A record 70 of the type described in the aforementioned U.S. Patent is mounted on a
turntable 71 and rotates with the turntable 71 during playback operations. The conductive arm
housing 80 is mounted for translational movement over the rotating record 70 during playback
operation. By opening the hinged cover 81, the interior of the housing 80 can be operated. The
housing 806 contains a chamber for removably receiving the pickup cartridge 90 therein. For
example, the pickup cartridge 90 is illustrated as a type described in Japanese Patent Application
No. 51-111685 (US Patent Application No. 667.420). Pick-up cartridge 90 comprises an
elongated body of non-conductive material having a narrow front with a pair of parallel side
walls 101 and (19) 103. An elastic coupling member 93 fixed to one end of the pickup arm 95 is
attached to a mounting plate 91 suspended and supported in the rear of the cartridge body. A
reproduction needle holder 97 attached to the other end of the pickup arm 95 holds nine
reproduction needles. The regenerator 99 is of the type described in the aforementioned U.S. Pat.
No. 3,842,194 and comprises a support body made of an insulating material and an electrode of
conductive material supported thereby. With regard to the means for suspending the mounting
plate 91 within the cartridge 90, and also the device provided in the housing which is preferably
used with the cartridge 90 to provide the illustrated position to the mounting plate 91, the
coupling member 93 and the pickup arm 95. For the details (not shown), refer to the abovementioned Japanese Patent Application No. 51-111685. When the pick-up arm 95 is in the
position shown, the arm projects through the aligned openings in the cartridge 9 o and the
housing 8 o so that the tip of the regeneration meter 99 is in the groove of the record 70 (20 ) Is
placed.
In FIG. 3, a portion of the side wall 82 of the housing and the side wall 101 of the front of the
cartridge is formed of a flat surface conductive material and the adjacent portions of the
regenerator 99, the regenerating needle holder 97 and the holder 97 of the arm 95. In order to
show the side of the arched leaf spring 34, it is removed. The spring 34 is connected at one end
to the regeneration needle 99 so as to make an electrical connection between the spring 34 and
the regeneration needle electrode. The other end of the spring 34 is mounted on a flat provided
on the pole 106. The pole 106 is frictionally coupled to a socket in a shelf 105 provided at the
front of the cartridge body. The flat therefore projects slightly from the socket. This spring
attachment, which facilitates centering of the arm in the cartridge and fine adjustment of the
tracking pressure of the playback needle, is the subject matter of Japanese Patent Application No.
51-112384 (US Patent Application No. 667.396). . After adjusting the position of the pole during
assembly of the cartridge and performing the adjustment, it is desirable to adhesively fix the pole
in the proper position. The end central protrusion (see FIG. 2) of the substrate 13 ′ is supported
on the upper surface of the block 110 (21) attachment made of non-conductive material. When
the cartridge 90 is in the operative position in the housing 80, the central projection of the
substrate 13 'is accommodated in the recess between the front side walls 101, 103 of the
cartridge and the conductor 15 (the thickness has been exaggerated The mounting block 110 is
arranged in a position such that the terminal 16 provided at the end of the illustration) coincides
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with the end of the spring 34 attached to the pole. Furthermore, for example, as shown in the
above-mentioned Japanese Patent Application No. 51-111685, when the cover 81 of the housing
is closed, a spring (not shown) attached thereto cooperates with the cartridge main body 90, and
the cartridge 9o Lower the front of the to ensure electrical contact between the spring 34 and
the terminal 16. As the geometrical change representing the signal formed at the bottom of the
groove of the record 70 passes under the regenerator 99, a change occurs in the volume
between the regenerating needle electrode and the conductive coating on the record 7o. Due to
the relatively large volume between the conductive coating of the record and the bottom of the
overlying housing 8o, the variable regenerating needle-to-record volume, which is low impedance
return 22 to the housing 80, is serially connected The spring 34 and the printed circuit
conductor 15 form a load on one end of the transmission line formed with the housing 8 o. The
other end of the transmission line is loaded by a series connection of a capacitor 17 ′ and a
varactor diode 21.
The signal pick-up operation is similar to that described for the device of FIG. The change in
capacitance between the regeneration needle and the record causes a change in the tuning
frequency of the resonant circuit formed by the transmission line and its end load capacitance.
The UHF oscillating signal applied to conductor 36 'via input lead 39 is coupled to the tuning
circuit via an inductive coupling between conductors 36' and 15. The center of the tuning change
range is set to a frequency slightly deviated from the frequency of the UHF oscillation signal
source, for example, by changing the bias supplied to the varactor diode 21. As a result, the
oscillation signal source frequency can be positioned on the slope of the resonance characteristic
curve of the tuning circuit, and, in practice, it can be raised and lowered with the change of the
capacity between the regeneration needle and the record (23 )Become. Conductor 41 relatively
inductively coupled to transmission line conductor 15 is energized by the UHF oscillation signal
having an amplitude that varies greatly according to the position on the slope of the UHF
oscillation signal frequency, and the amplitude of the UHF oscillation signal. The modulation is
detected by the detection diode 51, and the recorded signal information is reproduced. Use
printed circuit technology to form the conductors of the transmission line as a conductive coating
with precisely controlled dimensions on a dielectric substrate and appropriately standardize the
mounting of this substrate in the conductive housing In this way, it is possible to make a
transmission line with very desirable characteristics for the purpose of the pickup circuit
according to the invention. The desirable characteristics include (1) compactness in size and
shape, and (2) large change characteristic impedance as compared with a transmission line using
air as a dielectric, and hence, small change in capacity between the regeneration needle and the
record. In addition, the function to generate large resonance frequency change is enhanced, and
(3) the form is such that mass production of one having the same characteristic is possible
regardless of the skill of the assembling worker. (24) Furthermore, there are cases where it is
desirable for the user of the reproduction apparatus to easily replace the cartridge with a
reproduction needle without removing the wiring installation, but the transmission line
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conductor should be in the form of a printed circuit. By that, it gets easier more easily. In such
use, it is a particularly effective combination to use the printed circuit board structure with a
spring-shaped regenerative needle lead as shown in FIG. By properly controlling the dimensions
of the conductive ribbon for the spring 34 and the dimensions of the cartridge body and other
elements associated therewith, it has repeatable characteristics that are substantially free of leadinduced variation problems. A transmission line structure is obtained.
By arranging each conductor (15.36.41i in FIG. 1 15.36 ′, 41 in FIG. 2) as shown, and by
arranging the structural arrangement of the elements on the circuit board as shown in FIG. The
shape of the resonant characteristic curve of the tuning circuit formed by the transmission line is
mainly controlled by the relative dimensions and orientation of the relatively tightly coupled
conductors 15 and 41 and the spacing between them. In order to use printed circuit (25)
technology to obtain such dimensions, orientations and spacings, these parameters can be
precisely controlled, whereby the desired form is achieved, even in the case of mass production.
Characteristic curves can always be obtained. In order to obtain a substantially symmetrical form
of the resonance characteristic curve. However, an asymmetric curve may be desirable in order
to obtain the best compromise between sensitivity of the pickup device and the aperture
response. In general, when the slope of the characteristic curve in which the frequency of the
UHF oscillation signal source is located becomes steep, the sensitivity increases, and when it
becomes loose, the aperture response characteristic becomes good. By appropriately increasing
the length of the conductor 41 with respect to the conductor 15 and / or reducing the distance
between these openings, the slope of the slope on the high frequency side of the resonance
characteristic curve is made smaller on the low frequency side. Can be increased. (26) EndPage: 7
according to the parameters when satisfactory operation can be performed with a transmission
line of 200 Ω characteristic impedance, an oscillation signal source of 915 MHz, and a tuning
range center frequency of 910 MHz. The resonance characteristic curve was obtained in a
slightly asymmetrical form with steeper slopes on the high frequency side. Using the illustrated
configuration to provide a relatively loose coupling between the transmission line and the UHF
input coupling means (spacing adjustable conductor 36 in FIG. 1; conductor 361 in FIG. 2 having
a fixed spacing), The shape of the characteristic curve is not significantly influenced by the
variation of the load on the coupling means or the adjustment of the spacing of the coupling
means (in the case of FIG. 1). The UHF input coupling circuit is also preferably coupled gently to
the tank circuit (not shown) of the oscillating signal source, which avoids a large load on the tank
circuit and a high Q for the tank circuit. While being able to maintain, the effect that the
oscillating signal source frequency is stabilized in connection with it is acquired. When it is
desired to adjust the amplitude of the oscillation signal when the fixed interval input coupling
means shown in FIG. 2 is used, the coupling interval of the oscillation signal source to the tank
circuit may be changed.
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(27) In the embodiment shown in FIGS. 1 and 2, the one detection diode 51 is mounted away
from the conductor 15. In this way it is possible to prevent the unpredictable fluctuations of the
spurious resonances that can not be neglected between the transmission line and the lead of the
diode. To prevent spurious resonances and their unpredictable fluctuations, slot mounting
without leads uses type capacitors and not only the location of the printed conductor, but also
the slot and lead mounting for its associated circuit elements are holes The precise control of the
position makes it possible to reproduce a short lead or easily. By using printed circuit technology
which makes it possible to obtain lead arrangements, this can be done more effectively.
4. Brief Description of the Drawings FIG. 1 is a plan view showing a printed circuit board and
associated circuit elements of a pickup circuit configuration embodying the present invention,
and FIG. 2 is a diagram showing another embodiment of the present invention 2.) A perspective
view showing a variant of the device of FIG. 1, and FIG. 3 is a side view of a portion of a video
disc player incorporating the device of FIG. 2 in accordance with the principles of the invention
of. 99 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · Dielectric substrate, 15: first conductor 41: second conductor 36. 36 ′ third conductor
16.33. 34: reproduction needle electrode as first conductor , 17.17 '... capacitive means, 37, 39 ...
means for connecting the oscillation signal source to the second conductor, 51 ... amplitude
modulation detection means. Patent Applicant: RSC Corporation Attorney Shimizu, et al. 2
persons r2Q) EndPage: 85 List of Appendices (1) Specification 1 (2) Drawing 1 (3) Power of
Attorney and its translation 11 (4) Priority Certificate of Right and its translation 1 each (5)
Application 1 copy (6) Application examination request 1 ((? 1) Letters of Appeal 6 1st, other 3
'co-morners and agents (1) Inventor's address East Windsor Hemlock Ikoa, New Jersey, USA 10)
Edgage Eiko Deden Ringer (2) Agent's Address Kobe City 7-chome, Kuoi-dong District 4
Procedure correction (Spontaneous) 1977 2J-121 Patent Secretary General Katayama Ishibedon
2, title of the invention 2, title of the invention disc record playback device 3, person with
correction case Related patent applicants address New York State 10020 New York Rockefeller
Plaza 3 ° Name (757) Earl Seaney Corporation 4, agent EndPage: 10 Warning: Page
Discontinuity 5, object of correction
Disc record playback device
The column of the detailed description of the invention of the specification. 6, correction
contents (1) Correct "diode 25" in page 10, line 1 of the specification as "diode 51". (2) Correct
by line in the same book @ page 25, line 1 by the way of the arrangement of F line . (3)
Correct the Aperture response characteristics on page 26, line 9 of the same document as
Aperture response characteristics representing the effective range of the frequency response
characteristics of the resonant circuit . (4) Become good on page 26, line 14. I get better,
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that is, the effective range of the frequency response characteristic of the resonant circuit is
expanded. And correct. EndPage or more: 11
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