Abstract: The present invention is concerned with a recording medium wherein, in a recording medium in which the information may be regenerated optically, a track is pre-recorded or pre-formatted by being deviated along the track width with a signal which the baseband signal of a read-only information signal freed of high-frequency components. The present invention is also concerned with a recording apparatus for forming a track of an optical recording medium from which an information can be reproduced optically, wherein the apparatus includes a deviating device for deviating a track-forming recording beam along the width of the track of the optical recording medium, a deviation control signal generating device for generating deviation control baseband signals for controlling the deviation device, and a low-pass filter for eliminating the high-frequency components of the deviation control baseband signals.

Abstract: An optical recording apparatus employing a method of halting a recording operation halfway a unitary frame of additional information and capable of realizing an exact operation in recording the additional information at the joint of preceding and present record portions. Out of the last unitary frame of the additional information in the preceding operation, the remaining information portion not included in the preceding record is generated, at the beginning of an additional recording mode, by an address information generator 4 from the content stored in an address information memory 6.

Abstract: An apparatus and method for reproducing pit information precisely from a magnetic optical disk without being adversely affected by heat accumulation. The signal reproducing apparatus reproduces signals using a neural network constituting a decoder that decodes pits on the disk. The signal reproducing method provides learning using a sigmoid function and carries out signal reproduction using a step function.

Abstract: Disclosed is an IC card comprising a plurality of semiconductor IC chips and a plurality of lead wires acting as the terminals for connectin,o the electrodes of the semiconductor IC chips to the outside. The semiconductor IC chips and the lead wires are integrally sealed in a plastic board. This construction provides a significantly thin IC card of high reliability at low cost.

Abstract: A laser light beam generating apparatus includes at least one light beam source, resonator and an optical system. The resonator generates a type II second harmonic laser light beam. The resonator has a first reflector, a second reflector, a laser medium provided between the first and second reflectors and irradiated a light beam emitted from the light beam source through the first reflector and a non-linear optical crystal element provided between the laser medium and the second reflector. The optical system radiates the type II second harmonic laser light beam emitted from a virtual luminance point of the resonator to a conjugate point. In this laser light beam generating apparatus, with an effective length of the resonator L, an effective distance Le from the resonator to the conjugate point is set to thatLe=(m+1/2)Lwhere m is an integer.

Abstract: An optical disc equipped with a hub having a centering hole into which a spindle shaft of a disc driving mechanism is inserted, wherein a centering hole portion of the hub is provided with a centering hole reinforcing means made of a material excellent in abrasion resistance and smoothness or a member having a central hole is formed of a resin excellent in abrasion resistance and smoothness.

Abstract: A magneto-optical pickup apparatus includes an objective lens for focusing a laser beam emitted from a laser device onto a magneto-optical recording medium, driving coils, on which the objective lens is mounted, for driving the objective lens in focusing and tracking directions, and a plate arranged at an end portion of the driving coils between the objective lens and the magneto-optical recording medium. The plate is formed with a coil pattern for generating a magnetic field to be applied to the magneto-optical recording medium, and can allow a laser beam transmitted through the objective lens to pass therethrough.

Abstract: A color video printing apparatus includes a first sensor detecting a recording medium and determining whether the recording medium is a thermalsensible one, and a second sensor detecting a color ink ribbon cartridge which accommodates a color ink ribbon therein. The apparatus also includes a system controller which controls driving operations of a thermal head and the color ink ribbon depending upon detection results obtained by the first and second sensors, so that a video image is printed on the recording medium in multicolor or monochromatic printing mode.

Abstract: A magneto-optical recording medium has a multi-layer magnetic film comprising at least a reproducing layer, a memory layer, and a recording layer which are successively deposited in magnetically coupled relationship to each other. Information is recorded on the magneto-optical recording medium selectively in a first state in which the reproducing layer and the memory layer are magnetized by copying a magnetized condition of the recording layer, with a intensity-modulated light beam of a low intensity applied to the magneto-optical recording medium, or a second state in which the reproducing layer, the memory layer, and the recording layer are magnetized by an external recording magnetic field, with a intensity-modulated light beam of a high intensity applied to the magneto-optical recording medium.

Abstract: A data storage disk drive includes an optical head positioned in spaced relationship to the data storage disk by a holder for an objective lens and a piezoelectric body and a resilient body which are mounted on a surface of the holder which faces the data storage disk. An AC power supply applies an AC voltage to the piezoelectric body to produce a flexural standing wave that keeps the resilient body in quasi contact with the data storage disk for making substantially constant a gap between the optical head and the data storage disk.

Abstract: Image signals of moving subjects which are imaged by a slit camera, and time information generated by a time information generator after it has been reset by a start trigger signal, are successively stored in and erased from a large-storage-capacity memory on a first-in, first-out basis. After elapse of a predetermined time period after a record trigger signal has been supplied from a record trigger generator, a storage time control circuit controls the memory to stop storing and erasing the image signals and the time information, and keeps the image signals and the time information stored which have been stored before the memory stops storing and erasing the image signals and the time information. The image information of the subjects and the time information associated with the image information can be stored in the memory within a storage time that depends on the storage capacity of the memory.

Abstract: A still picture filing apparatus comprising still picture preparation circuit for preparing a plurality of still pictures and adding identification data to each of such still pictures; still picture memory for storing the plural still pictures with the identification data added thereto respectively; still-picture transmission data preparation circuit for preparing still-picture transmission data indicative of a still picture transmission sequence in accordance with the identification data; transmission command signal generation circuit for generating a transmission command signal to instruct transmission of the still pictures; and a controller responsive to the transmission command signal outputted from the transmission command signal generation circuit and reading out the still pictures from the still picture memory in conformity to the transmission sequence indicated by the still-picture transmission data obtained from the still-picture transmission data preparation circuit.

Abstract: A track address pattern suitable for being applied to a magnetic disk apparatus which positions a head to a track with a desired address by a sector servo system, for example, wherein a gray code of a plurality of bits corresponding to a track address of the magnetic disk apparatus is divided per 2 bits thereof into groups, the respective groups of 2 bits are converted into codes of 3 bits (001), (010), (100) and (111) depending on the values thereof, respectively, whereby the converted codes are recorded on the magnetic disk as the track address pattern.

Abstract: A disc cartridge includes a cartridge main body which accommodates an optical recording medium, such as an optical disc or a magneto-optical disc, and which includes an aperture for exposing the optical recording medium at least partially to outside, a shutter for opening or closing the aperture, a shutter resetting spring for biasing the shutter towards a side closing the aperture and a shutter locking member for maintaining the shutter at a position closing the aperture. A shutter opening/closing member introducing groove having its open end on a side of the cartridge main body normal to the shutter sliding direction is formed along the front side of the cartridge main body parallel to the shutter sliding direction, and the free end of the shutter locking member is exposed partially to the groove to enable the disc cartridge to be loaded to a cartridge loading section of the recording/reproducing apparatus with the shutter sliding direction as the introducing or loading direction.

Abstract: A television conference system in which video and audio information generated in each hall are transmitted and reproduced in the other hall and further in which a plurality of personal terminals having at least a keyboard, or other information input device, and a monitor are provided in the first and second conference halls so that the attendees can transmit and receive personal electronic messages from one terminal to another in each hall.

Abstract: A disc memory apparatus allows its magnetic head to reach a target track in a short period of time, wherein address data is recorded on each two-track width corresponding to each of the even-numbered and the odd-numbered tracks; either of two kinds of burst signals is recorded on each one-track width corresponding to each of the even-numbered and the odd-numbered tracks; the address of the record track is detected, based on the result of a comparison of two kinds of burst signals and the first address data, or in addition to this, the detected address data is further offset by the second address data; since the lengths of the servo sector areas required to detect the address data are shortened, the address data of the magnetic head are detected to a higher accuracy using a smaller number of reference signals; and the magnetic head can be moved at a fast speed, thus in a short period of time, resulting in a short seek time.

Abstract: A magneto-optical positioning apparatus for synchronously positioning both a magnetic pickup device and an optical pickup device over the tracks of a disc and including an arm member, a magnetic head, a pair of parallel first support links, each of the first support links being integrally formed with and hinged at one end to the arm member and hinged at another end to the magnetic head, the first support links forming a first parallelogram linkage allowing the magnetic head to follow fluctuations of the disk in a plane perpendicular to a recording surface of the disc while maintaining the magnetic head parallel to the recording surface, a base support, and a pair of parallel second support links, each of the second support links being integrally formed with and hinged at one end to the arm member and hinged at another end to the base support to form a second parallelogram linkage for raising and lowering the arm member towards and away from the recording surface of the disk while maintaining the arm substanti

Abstract: The present invention is directed to apparatus. Upon actuation, a system controller controls a digital-to-analog converter to derive a pulse-shaped wave sweep signal. This sweep signal is supplied through an adder and a driver to a focusing actuator, and the focusing actuator drives an objective lens of an optical pickup in response to the sweep signal. According to the focusing servo apparatus of the invention, the focusing servo can be locked in smoothly.

Abstract: A video camera carrying case has an accessory accommodating portion with a reinforcing member detachably fastened to a video camera accommodating portion by a fastening member. The tightness with which the accessory accommodating portion is fastened to the video camera accommodating portion is changed by the fastening member, thereby improving the portability of the video camera carrying case.

Abstract: A data input apparatus comprising a pen for selectively indicating and inputting desired data; a display unit for displaying an image of the input data; a tablet for obtaining coordinate data by indicating with the pen the position corresponding to a predetermined portion of a pattern displayed on the display unit; means for detecting the coordinate data in response to a downward press of the pen to the tablet, and further detecting the coordinate data in response to an upward lift of the pen from the tablet; means for setting a first region of a predetermined area in the tablet, and also setting a second region which includes the first region and has an area greater than that of the first region; and deciding means for accepting the input data in response to a downward press of the pen to the first region and thereafter settling the input data in response to an upward lift of the pen from the second region.