Abstract: An information recording apparatus for recording at least a video signal and a digital audio signal onto an optical record medium, is provided with: a pulse signal generation device for generating a pulse signal having a pulse width corresponding to the video signal and the digital audio signal to be recorded; a first pulse width adjustment device coupled to the pulse signal generation device, for decreasing the pulse width of the pulse signal by an amount proportional to the pulse width of the pulse signal to output a firstly adjusted signal having a firstly adjusted pulse width; a second pulse width adjustment device coupled to the first pulse width adjustment device, for increasing the firstly adjusted pulse width of the firstly adjusted signal by a predetermined amount to output a secondly adjusted signal having a secondly adjusted pulse width; and a light emission device for emitting a recording light corresponding to the secondly adjusted signal onto the optical record medium to form a record pit having

Abstract: An apparatus for recording information on a recordable optical disc by applying a light beam on the surface thereof, the disc includes a first recording area on which information is recorded and reproduced while the disc is rotated at a first linear velocity; and a second recording area on which information is recorded and reproduced while the disc is rotated at a second linear velocity. The first recording area includes a test recording area. The apparatus includes recording power determining unit for determining first optimum recording power for recording information on the first area by a test recording utilizing the test recording area, and for determining second optimum recording power for recording information on the second area by multiplying the first optimum recording power by a predetermined constant.

Abstract: A laser power calibration device installed in a recording device for recording information on an optical recording medium includes: laser unit for emitting and irradiating a laser beam on the optical recording medium to record FM video signal and EFM audio signal; unit for varying recording power of the laser beam and duty of recording signal for driving the laser unit independently of each other; unit for reading the FM video signal and EFM audio signal recorded on the optical recording medium; unit for detecting carrier level of the recorded FM video signal and error rate of recorded EFM audio signal; and unit for determining optimum recording power of the laser beam so that the carrier level is higher than a first predetermined value and the error rate is smaller than a second predetermined value.

Abstract: An optical transceiver unit capable of preventing any crosstalk from an optical transmitter to an optical receiver to thereby avert reduction of the reception sensitivity. The optical transceiver unit comprises a multilayer printed circuit board, a lower case for housing the multilayer printed circuit board therein, and an upper case so disposed as to cover the lower case for enclosing the multilayer printed circuit board in an assembly of the two cases. A light emitting element module and a light receiving element module are attached to one side wall of the lower case. The printed circuit board has a first region where a transmitting circuit is formed, and a second region where a receiving circuit is formed. The first and second regions are completely isolated electromagnetically from each other by a first shield plate fixed to the lower case and a second shield plate fixed to the upper case.

Abstract: A read-write head of a magneto-optical disc player has an optical head having an optical pickup, and a magnetic head having an electromagnet. The optical head and the magnetic head are each slidably held by guide members so as to be moved in a radial direction of an optical disc. A motor is mounted on each head for moving the head along the guide member. A relative position between both heads at a position where both heads oppose each other is detected, and both heads are moved along the guide members, maintaining the relative position.

Abstract: A read-write head of a magneto-optical disc player has an optical head having an optical pickup, and a magnetic head having an electromagnet. Each of the optical head and the magnetic head is slidably held by guide members so as to be moved in a radial direction of an optical disc. Permanent magnets are mounted on both heads for attracting each other head. Thus, when one of the head moves, the other follows.

Abstract: A position detector includes: light emitting component for irradiating the surface of an object to be measured; two light receiving components for receiving light reflected by the measured surface, a distance from one of the light receiving components to the measured surface as viewed in a direction substantially perpendicular to the surface being different from a distance from the other of the light receiving components to the surface; calculating circuit for calculating a correction quantity for correcting the distances between the light receiving components and the surface, with the correction quantity being calculated on the basis of a difference between the output signals of the light receiving components; and, moving component for correcting the distances between the measured surface and the light receiving components in accordance with the correction quantity. A first embodiment has two light receiving components each spaced at different distances from the surface.

Abstract: An optical magnetic recording system has a magnetic head for generating a magnetic field on a magneto-optical disk, and an optical head including a magnetic actuator is provided for irradiating a laser beam. A field cancellation magnet is attached to the back of the magnetic head for producing a magnetic force so as to cancel a leakage magnetic force of the magnetic actuator which affects recording of information. This positioning of the field cancellation magnet provides better compensation of the leakage field without affecting the modulating field of the magnetic head.

Abstract: A magneto-optical disk device for receiving a magneto-optical disk housed in a cassette and for driving the magneto-optical disk by a disk drive motor to read/write the disk is disclosed. The device includes a movable cassette carrier having a top plate for receiving the cassette therein, a read/write head located under the cassette carrier, a magnetic field coil slidably mounted on the top plate above the read/write head to move in a direction parallel to the movement of the read/write head, a pole extending substantially perpendicular from the read/write head at a position offset from the cassette carrier, and an arm having one end slidably mounted on the pole and other end fixedly connected to the magnetic field coil. The arm is mounted to slide along the pole to move the magnetic field coil along a direction substantially perpendicular to the disk.

Abstract: A linear motor is movably disposed in a disc unit internally provided with a cartidge holder for loading and ejecting a disc cartridge and is securely locked by a locking mechanism at the time of ejection of the cartridge. The locking mechanism comprises a first locking member extending downwards from the cartridge holder and a second locking member securely mounted on the linear motor. When the disc cartridge is ejected by the cartridge holder, the first locking member is brought into contact with the second locking member to move the linear motor toward a location at which the linear motor is securely locked.

Abstract: A given number of sheets are set to a supply section and, after being bundled, supplied from the supply section. The bundled portion of the bundled sheets is read out by a reading-out unit and a sorting card is prepared by a sorting card preparing unit on the basis of read-out data. The thus set sheets are taken out sheet by sheet by a take-out unit and sorted by an inspection unit and sorting unit into normal sheets, soiled sheets and reject sheets. The reject sheets are collected, together with the sorting card, at a reject sheet sorting/collecting unit.