Abstract: A light beam spot size measuring device comprises an optical magnifying system. The magnifying system receives an image of the recording light beam spot formed within an optical recording apparatus, and magnifies it. Then the converter receives the magnified image of the beam spot formed on the pickup surface thereof so as to produce an output signal representing the size of the beam spot. An attenuator device attenuates the intensity of the image of the laser beam spot during magnification. The image of the beam spot therefore can be currently measured on the basis of the output signal even with the high intensity of the recording light beam.

Abstract: An apparatus for drying optical disks heats a disk from the underside, and optionally blows clean air between the heater and the disk being dried in order to prevent contaminants from landing on the disk. Heat control is provided such that a surface temperature of the disk during drying is maintained uniform, preventing brittleness. The apparatus preheats the heater, placing the disk in a standby position during warm-up. The apparatus then moves the disk over the heater, and monitors the temperature of the disk, removing the disk back to the standby position when the disk reaches a predetermined temperature. In order to provide uniform heating, a radiant heat controlling plate having a suitably-shaped opening portion may be provided. Additionally, temperature distribution throughout the disk may be achieved as desired, in accordance with the heat control performed, and/or in accordance with the shape of the opening portion of the radiant heat controlling plate.

Abstract: A method and implementing apparatus for electroless plating an optical disk causes the disk to be positioned in a container with its main surface upturned and then rotated. As the disk rotates, liquid for treating or cleaning the disk is caused to fall on the upturned main surface from a position above the disk.

Abstract: A muting control circuit is provided in which muting is performed when any one of a plurality of unlock detection signals is detected, indicating circuits is unlocked or when a data error is detected in a demodulator. In this way, reading time can be shortened to the minimum time required for muting. In addition, when one unlock detection circuit is triggered due to a disorder in the input, the unlock detection signal is provided immediately, so that the muting control signal is supplied and muting can be performed even when there is a time delay before the unlock detection circuit detects an unlocked state.

Abstract: Herein disclosed is a device for accurately measuring an angular deviation of a flat plate such as a video disk and a digital audio disk. A light beam emitted from a light source is obliquely made incident on the flat plate. A light beam reflected by the flat plate is refracted by a convex lens and detected by a semiconductor position-sensitive detector. The convex lens and the position-sensitive detector are disposed in such a manner that the distance between a reflection point on the flat plate and the convex lens and the distance between the convex lens and the position-sensitive detector become two times the focal length and the focal length of the convex lens, respectively.

Abstract: A demodulation clock generator circuit employed in a modulation system such as a bi-phase mark system is improved by including a frequency detector to speed up the initial processing of a data signal to be demodulated. The frequency detector generates a frequency detection signal which corresponds to a signal from an oscillator and a signal from a synchronization signal portion of the signal to be demodulated. The frequency detector includes a memory portion clocked by the oscillator for storing the states of the signal to be demodulated and a signal generating portion for supplying the frequency detection signal when information stored in the memory portion is the same as a synchronizing portion of the signal to be demodulated and has a frequency of less than a predetermined value.

Abstract: A surface acoustic wave (SAW) device is mounteed in such a manner that its functional surface faces a base plate and a space is formed therebetween to avoid inferiority in device characteristics. Electrodes of the SAW device and bumps formed on electrodes at predetermined positions of the base plate are connected to each other by applying pressure and heat to secure electrical continuity. A peripheral surface of the SAW device is bonded to the base plate by an adhesive to seal the functional surface of the SAW device.

Abstract: An optical information recorder in which a focusing unit is coupled through a piezoelectric unit to a screw driven carriage. The screw is used for rough adjustment and the piezoelectric unit for fine adjustment.

Abstract: In an optical disk manufacturing method in which a first photo resist layer, an intermediate resin layer, and a second photo resist layer are formed on a substrate in the stated order, a resin solution which is unsoluble in organic solvent is applied to the first photo resist layer, heated, and hardened to form the intermediate resin layer. Thereby the use of a large, expensive device such as a vacuum deposition device or sputting device is eliminated.

Abstract: A signal processing circuit for a telephone set. This circuit includes signal sending means that sends to a transmission line a sound signal produced from a telephone transmitter, a first adding circuit that adds the signal from the transmission line to the sound signal from the transmitter, an inverting circuit that phase-inverts the output signal from the first adding circuit, an impedance element provided between the transmission line and the output of the inverting circuit, and a second adding circuit that adds the output sound signal from the transmitter to the output signal from the inverting means and supplies the resulting composite signal to a telephone receiver.

Abstract: A video disk recording method and the recorded disk in which a video signal is frequency-multiplexed with a digital data signal into respective frames which are asynchronous to each other. A time code is recorded in both types of frames. The time is incremented periodically but the period in one of the types of frames is occasionally varied to compensate for the asynchronism.

Abstract: A system for recording by frequency-division and time multiplex a television signal divided into frames and a digital data signal divided into blocks. The time durations of the blocks and frames are not evenly divisible but times, for instance seconds, which approximately are different fixed multiples of the number of counted frames and blocks, are recorded together with the counted frames and blocks. The frame time is incremented after a fixed number of frames is counted. The block time is incremented in the block following the incrementing of the frame time.

Abstract: In order to reduce a crosstalk component contained in a playback video signal reproduced from a recording medium such as a video disc, method and system for recording a video information comprises a step for recording a video signal in a manner that an absolute value of a difference between a cumulative value of the phase of a recording RF signal of each horizontal scanning period of a first section of recording tracks and a second cumulative value of the phase of the recording RF signal of each horizontal scanning period of a second section of said recording tracks adjacent to said section of recording tracks is controlled to a value (2m+1).pi. (m being a positive integer including 0).

Abstract: An optical information-carrying disc player for reading information recorded on an optical information-carrying disc by means of a pick-up device placed in the proximity of the information-carrying disc which is rotated about the central axis thereof by a disc support means such as turn-table, which features cross-talk eliminating means connected to at least either one of the disc support means and pick-up device, for adjusting the angular position of the pick-up device with respect to the recording surface of the information-carrying disc, thereby to eliminate or suppress the cross-talk.

Abstract: In a video and/or audio disc information recording and reproducing apparatus including a coarse tracking control means, to coarsely vary the positions of the turntable and the pickup means relative to each other in a radial direction of the disc on the turntable, is driven to move in a direction and over a distance to lessen the difference between the address picked up and the address to be searched and at a speed varying with the absolute value of the difference between such addresses and decreasing at a deceleration rate which increases as absolute value decreases within a predetermined range. The apparatus includes a fine tracking control means to minutely vary the relative positions of the turntable and the pickup means. The fine tracking control is made operative when the absolute value is reduced to the lower limit of the above mentioned predetermined range and the coarse tracking control means is made inoperative.

Abstract: A time base control unit in an apparatus for reproducing recorded information from a disc is provided, which comprises information reproduction processing means for reading and processing the recorded information, disc rotating means, tracking servo means for jumping an information read-spot, sync separating means for separating a sync signal from the information signal read, reference signal generating means, means for detecting a relation between the sync and reference signals and for outputting a phase difference signal, and time base servo means for compensating the time base fluctuation of the reproduction information signal in response to the phase difference signal. The reference signal generating means serves to coincide the phases of the sync signal and the reference signal before and after the jumping operation in order to permit the time base servo control such as spindle servo or tangential servo to be locked-in immediately after the jumping operation of the read-spot.

Abstract: A picture information processing system comprising an input for generating a play control signal in accordance with external operations (2, 3); memory for storing picture information and for producing a picture information signal (5, 9, 10); display for displaying a picture on a screen in accordance with the picture information (5, 8, 1); detector for producing a detection signal when the picture information signal has an instantaneous magnitude equal to a predetermined value (5, 11, 12); and a controller for performing a predetermined result operation, such as modification of the reproduced picture, reproduction of a score on the screen, and production of a sound, in accordance with the play control signal and the detection signal (5, 6); thereby to perform an advanced and complicated operation without increasing the steps of the program governing the system.

Abstract: A synchronizing signal separator network for use in an information reproducing system including a time-axis error signal generator, comprising a non-linear impedance circuit to non-linearly modify the amplitude of a supplied composite video signal for suppressing the video signal component of the composite video signal, a differentiating circuit to differentiate the output signal from the non-linear impedance circuit and a slicing circuit to slice off those portions of the output signal from the differentiating circuit which are higher in magnitude than a predetermined level, the output signal from the slicing circuit being used to produce a signal to be compared with a predetermined reference time-axis error signal signal in the time-axis error signal generator.

Abstract: The output of a phase comparator in the PLL of the data reproduction unit is filtered to remove low frequency components which may be due to record eccentricity. The filtered output is then rectified and integrated, with the level of the integrated signal determining whether the PLL should be operated in a broad or narrow band state.

Abstract: An optical data recording disc has a protrusion forming layer which is formed on a gas generating metal layer, and the gas generating metal layer, in turn, is formed on an optically polished disc. An optical beam is modulated by data and impinges on the gas generating metal layer, which locally evaporates the metal layer to form a gas. The gas expands and produces protrusions in the protrusion forming layer, and these protrusions are representative of the data. Accordingly, because the protrusions are formed essentially simultaneously with the recording operation, it is possible to reproduce the data being recorded immediately after the data is recorded so that failures in a recording device or in the optical data recording disc can be detected immediately.