Abstract: A tilt servo system for performing a servo control in order to compensate an aberration caused by a tilt of an optical disc, having: a pickup for radiating a laser beam onto each track of the optical disc, the pickup having a laser light source for emitting the laser beam, an objective lens for converging the emitted laser beam on the optical disc, and a liquid crystal panel positioned on an optical axis of the emitted laser beam in order to compensate the aberration; a tilt sensor for detecting the tilt of the optical disc, and for outputting a detection signal corresponding to the tilt of the optical disc; a storage device for storing the detection signal corresponding to the tilt of an (N-.alpha.).sup.th track of the optical disc outputted from the tilt sensor; a controller for controlling the liquid crystal panel on the basis of the detection signal corresponding to the tilt of the (N-.alpha.).sup.th track of the optical disc stored in the storage device when the pickup radiates the laser beam onto an N.

Abstract: An optical pickup apparatus in which a difference between a crosstalk amount to a desired track to be read on an optical disc by a signal recorded on a track locating on an inner circumference of the desired track and a crosstalk amount to a desired track by the signal recorded on the track locating on an outer circumference of the desired track is generated as a tilt error signal value indicative of the occurrence of an aberration, and the aberration is optically corrected on the basis of the tilt error signal value. Thus, the crosstalk can be sufficiently reduced even for the optical disc with a high recording density.

Abstract: An optical recording medium discriminating apparatus discriminates at least two types of optical recording media having pits of different depths carrying recorded information. A light beam of a predetermined wavelength is caused to be incident to an optical recording medium, the amount of returning light therefrom is detected, and a read signal according to the detected amount of returning light is produced. The amounts of light in two areas, line-symmetrical to each other in the tangential direction of a track consisting of a sequence of pits, are detected from the amount of returning light, and a push-pull signal corresponding to a difference between the amounts of light in the two areas is produced. A phase difference between the read signal and the push-pull signal is detected, to discriminate the type of the optical recording medium is discriminated.

Abstract: A three-dimensional coordinates input apparatus in which a hand detecting plate and finger detecting portions are set into contactless states for the hand and fingers and the hand detecting plate and finger detecting portions are moved or rotated in accordance with the motions of the hand and fingers, thereby obtaining graphic data. When an object of three-dimensional computer graphics is grasped by the hand of the graphics based on the three-dimensional coordinates data, the finger detecting portions are depressed to the fingers in the real space, thereby giving a tactile sensation to the fingers. Further, the motion of the hand is detected by an infrared sensor.

Abstract: Disclosed is a digital signal processor for processing input digital signals, comprising an address generation unit for generating an address of an addressing mode which is used for processing the input digital signals; a setting unit for setting an initial value necessary for generating the address in advance in the address generation unit; and an instruction designating unit for designating only execution and stop of address generation to the address generation unit, wherein the address generation unit in which is set the initial value is so constructed as to perform execution and stop of address generation only by designation of the execution and stop outputted from the instruction designating means.

Abstract: An optical pickup has a suspension base, a holder suspended from the suspension base by wires in a form of a cantilever, an optical system provided in the holder and having a mirror and an objective mounted in a body, and a flexible wiring plate connected between the holder and the suspension base. Effective length of the flexible wiring plate for focusing is approximately equal to suspension effective length of the wire. The flexible wiring plate comprises a pair of horizontal planes perpendicular to focusing direction and a vertical plane perpendicular to tracking direction provided between the horizontal planes.

Abstract: An optical pickup has a suspension base, a holder suspended from the suspension base by wires in a form of a cantilever. The optical pickup is slidably mounted on a guide shaft. The guide shaft is pivoted so that an optical axis of an optical system becomes perpendicular to an optical disk. The holder is provided to be tilted in a radial plane with respect to the optical disk when the holder is moved for focusing the optical system.

Abstract: An optical disc reading apparatus having a reduced overall height and simplified structure. The disc drive motor is mounted with its output shaft extending downward. A turntable is fixed to the output shaft below the body of the motor. A disc carriage is mounted so as to be movable only in a horizontal direction towards and away from the turntable, and a clamper clamps the disc once it has been conveyed by the disc carriage to the playing position on the turntable. A pickup is mounted below the turntable on the side of a loaded disc opposite both the motor and turntable. At least the objective lens of the optical pickup is lowered away from the turntable when the disc is being loaded to allow free movement of the disc toward the turntable.

Abstract: A pickup unit for use in an optical information record/reproduce system comprising a plurality of optical elements including a light-emitting device and an objective lens by which the light issuing from the light-emitting device is focused as a beam spot on the recording surface of a recording medium, a retaining mechanism that holds the plurality of optical elements and which is movable in a direction parallel to the recording surface, and a tilt servo mechanism for causing the optical axis of the beam spot to intersect the recording surface at right angles. The tilt servo mechanism includes a sensor for detecting the angle of inclination of the optical axis in relation to the recording surface. The sensor has a sensor stay as an integral part thereof. The sensor stay is provided as an integral part of the retaining mechanism and is movable with respect to the recording surface.

Abstract: A new optical parts driving mechanism in an optical information reader is provided. In general, the reader reads information contained in an information recording medium such as a disc having a driving mechanism axially extending in the center thereof. The optical parts driving mechanism has a lens holder adapted to travel parallel to the disc and carrying an objective at a portion substantially closest to said disc driving mechanism. Said driving mechanism further has focus direction drive and track direction drive. The track direction drive is mounted to said lens holder on an opposite side thereof with respect to said disc driving mechanism.

Abstract: An optical data reading device wherein an optical pick-up head (10), which reads the light reflected from a disk data recording carrier (1) by detecting a light flux (8) onto a data track of the disk, is movable radially of the disk along a carrier (15) that is tiltable about an axis (18). The spacing between the optical pick-up head and the disk may then be kept almost constant by tilting the mounting plate and optical pick-up head in response to an output signal of a detector which detects warp of the disk.