Abstract: A coil assembly includes a coil arranged around a vertical axis, and a supporting member for carrying the coil. The supporting member is formed with a through hole corresponding to the vertical axis. The coil includes a plurality of coil elements which are connected in parallel.

Abstract: A magnetic head is provided with a substrate and a magnetic field generating coil formed on the substrate. The substrate has a principal surface facing a storage disk and divided into an inner area and an outer area surrounding the inner region. The magnetic head also includes a dielectric layer enclosing the coil and facing the storage disk. The dielectric layer is formed in the inner area of the principal surface of the substrate but not in the outer area. As tilting, the storage disk comes into contact with the dielectric layer, thereby being prevented from bumping into the outer area of the principal surface of the substrate.

Abstract: An optical head has objective lenses that converge a light beam, a light-emitting surface that faces an optical recording medium with an air layer therebetween and from which the light beam converged by the objective lenses exits towards the optical recording medium, and a light reflection preventing film that is provided at the light-emitting surface. A recess is formed in the light-emitting surface, and the light reflection preventing film is provided inside the recess.

Abstract: A magnetic head includes a coil for generating a magnetic field, and an electroconductive film superposed over the coil in the axial direction of the coil. The film is formed with a hole in the center. The electroconductive film is composed of a non-magnetic substance, and a first slit is formed in the electroconductive film extending from the hole to the outer peripheral edge of the electroconductive film. A second slit surrounds the inner peripheral edge of the electroconductive film. A continuity component is formed to electrically connect the inner peripheral edge of the electroconductive film to a radially outer region of the electroconductive film.

Abstract: A coil assembly includes a coil arranged around a vertical axis, and a supporting member for carrying the coil. The supporting member is formed with a through hole corresponding to the vertical axis. The coil includes a plurality of coil elements which are connected in parallel.

Abstract: A magnetic head includes a dielectric member, a coil and a heat conductor. The dielectric member has an obverse surface held in facing relation to a data storage disk. The coil generates a required magnetic field. The coil is provided in the dielectric member or in the obverse surface of the dielectric member. The heat conductor absorbs heat generated by the coil. The heat conductor has a heat conductivity which is higher than that of the dielectric member. The heat conductor has a surface which is at least partially irregular.

Abstract: An optical disk apparatus includes a light source, an objective lens, a slider to hold the lens, a suspension to support the slider, a mirror located below the slider, and a seek mechanism to move the mirror and the slider in the tracking direction of an optical disk to be used. The mirror upwardly reflects light traveling in a predetermined horizontal direction, thereby causing the reflected light to enter the objective lens arranged above the mirror. The mirror is rotatable about a prescribed axis for causing the reflected light to shift in the above-mentioned horizontal direction.

Abstract: An information reproducing head which uses a magnetic-substance chip having mono-magnetic domain structure as an information reproducing device so that information, which has been recorded on an information recording medium with a high density, can be copied in an enlarged manner and reproduced with high precision.

Abstract: An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium based on a reflected light beam from the optical recording medium. The apparatus includes a light splitting part having a plurality of light splitting stages which split the reflected light beam from the optical recording medium into a plurality of light beams, and a photodetector unit including a plurality of photodetectors which receive the plurality of light beams from the light splitting part. The photodetector unit includes a plurality of photodetectors which receive light beams used to detect a focal error, at least one photodetector which receives a light beam used to detect a tracking error, and a plurality of photodetectors which receive light beams used to detect magneto-optic information recorded on the optical recording medium.

Abstract: An optical disk apparatus includes a light source, an objective lens, a slider to hold the lens, a suspension to support the slider, a mirror located below the slider, and a seek mechanism to move the mirror and the slider in the tracking direction of an optical disk to be used. The mirror upwardly reflects light traveling in a predetermined horizontal direction, thereby causing the reflected light to enter the objective lens arranged above the mirror. The mirror is rotatable about a prescribed axis for causing the reflected light to shift in the above-mentioned horizontal direction.

Abstract: An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium based on a reflected light beam from the optical recording medium. The apparatus includes a light splitting part having a plurality of light splitting stages which split the reflected light beam from the optical recording medium into a plurality of light beams, and a photodetector unit including a plurality of photodetectors which receive the plurality of light beams from the light splitting part. The photodetector unit includes a plurality of photodetectors which receive light beams used to detect a focal error, at least one photodetector which receives a light beam used to detect a tracking error, and a plurality of photodetectors which receive light beams used to detect magneto-optic information recorded on the optical recording medium.

Abstract: An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium based on a reflected light beam from the optical recording medium. The apparatus includes a light splitting part having a plurality of light splitting stages which split the reflected light beam from the optical recording medium into a plurality of light beams, and a photodetector unit including a plurality of photodetectors which receive the plurality of light beams from the light splitting part. The photodetector unit includes a plurality of photodetectors which receive light beams used to detect a focal error, at least one photodetector which receives a light beam used to detect a tracking error, and a plurality of photodetectors which receive light beams used to detect magneto-optic information recorded on the optical recording medium.

Abstract: An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium and detects a focal error based on a reflected light beam from the optical recording medium. The apparatus includes a composite prism which deflects a part of the reflected light beam to at least two positions excluding a central part of the reflected light beam, and a photodetector device having a plurality of photodetectors which respectively detect the deflected parts of the reflected light beam and output detection outputs. The focal error is detected based on the detection outputs of the photodetector device.

Abstract: An optical information recording/reproducing apparatus records information on and/or reproduces information from an optical recording medium and detects a focal error based on a reflected light beam from the optical recording medium. The apparatus includes a composite prism which deflects a part of the reflected light beam to at least two positions excluding a central part of the reflected light beam, and a photodetector device having a plurality of photodetectors which respectively detect the deflected parts of the reflected light beam and output detection outputs. The focal error is detected based on the detection outputs of the photodetector device.

Abstract: An optical head unit includes a motor having a stator and a rotor which is mounted rotatably on the stator, at least the rotor having a generally disk-shaped (i.e., circular or polygonal) configuration, and an optical system mounted on a common, main surface of the rotor. The optical system includes a light emitting part for emitting a light beam, a focus actuator, an objective lens provided on the focus actuator, and a light beam receiving part. The light beam emitted from the light emitting part is output via the objective lens, and light received via the objective lens is received by the light receiving part.