Abstract: A device such as an integrated display device and projector apparatus using said display device for projecting an image on a screen comprises a number of light sources, waveguides, optical switches, micro-lenses and scanning mirrors. The display apparatus consists of said display device, a modulator circuit, an optical switch controller, a scanning mirror controller, a synchronizer and projection optics. This device enables the projector apparatus to be extremely small and to reduce its power consumption in comparison with conventional projectors.

Abstract: A device such as an integrated display device and projector apparatus using said display device for projecting an image on a screen comprises a number of light sources, waveguides, optical switches, micro-lenses and scanning mirrors. The display apparatus consists of said display device, a modulator circuit, an optical switch controller, a scanning mirror controller, a synchronizer and projection optics. This device enables the projector apparatus to be extremely small and to reduce its power consumption in comparison with conventional projectors.

Abstract: A symbol selector has: a storage unit which stores a symbol list including predetermined symbols arrayed; a manipulator unit for manipulating a pointing position of a virtual pointer which virtually moves over the symbol list stored in the storage unit; a sensor unit which detects acceleration per unit time which is applied to the manipulator unit; a motion direction determination unit which determines a motion direction of the virtual pointer, based on a detection result from the sensor unit; a motion unit which moves the virtual pointer in units of symbols in the motion direction determined by the motion direction determination unit; and a selection unit which selects a symbol currently pointed by the virtual pointer moved by the motion unit.

Abstract: A magnetic disk with an embossed pattern is provided. The disk comprises a magnetic film formed on a substrate provided with an erose embossed pattern on a surface along a circumferential direction, said embossed pattern having an upper surface, a lower surface, and a inclined portion or a vertical portion between the upper surface and the lower surface. In the disk, at least the magnetic film in the inclined portion or the vertical portion of the embossed pattern is magnetized, the direction of said magnetization in the magnetic film in the inclined portion or the vertical portion in cross section in the circumferential direction of the magnetic disk is substantially parallel with a film surface of the magnetic film, and said magnetic film in the inclined portion or the vertical portion has a magnetization reversal area.

Abstract: A magnetic disk with an embossed pattern is provided. The disk comprises a magnetic film formed on a substrate provided with an erose embossed pattern on a surface along a circumferential direction, said embossed pattern having an upper surface, a lower surface, and a inclined portion or a vertical portion between the upper surface and the lower surface. In the disk, at least the magnetic film in the inclined portion or the vertical portion of the embossed pattern is magnetized, the direction of said magnetization in the magnetic film in the inclined portion or the vertical portion in cross section in the circumferential direction of the magnetic disk is substantially parallel with a film surface of the magnetic film, and said magnetic film in the inclined portion or the vertical portion has a magnetization reversal area.

Abstract: In a cartridge type hard disk drive, a pair of yokes with magnets as a magnetic circuit for a voice coil motor are mounted in a cartridge holder separated from a disk cartridge. When the disk cartridge is inserted into the cartridge holder, a movable coil for the voice coil motor is placed in a magnetic field formed by the magnetic circuit in the cartridge holder. In this condition, a drive current is passed through the movable coil, thereby driving a head arm actuator. With this configuration, the disk cartridge in the cartridge type hard disk drive can be reduced in size and weight. In addition, a further cost reduction and resource saving can also be realized.

Abstract: The present invention introduces an information distribution method capable of making an information distribution business for reliably authenticating a recording medium and distributing information in a prepaid manner. For this end, ID information recorded in a read-only area is read out from a disc-shaped recording medium having a read-only area and a recording and/or reading area. Judgment (or decision) is made whether or not information distribution to the recording medium is permitted based on the read-out ID information. The signal information distributed as a result of the judgment is recorded in the recording and/or reading area of the recording medium. The recording and/or reading area of the recording medium is rewritable. In case of reading the ID information out of the read-only area of the recording medium, erasing of recorded information for the recording and/or reading area is performed at the recording position for the ID information before reading the ID information.

Abstract: A magnetic disk apparatus includes head bases placed one on another and supported for pivotal motion on a common pivot shaft, and sliders provided at free ends of the head bases and having magnetic heads mounted thereon with suspensions interposed therebetween, respectively. A coil for a voice coil motor serving as a first driving apparatus is provided on the opposite side to the sliders with respect to the pivot shaft. Second driving apparatus formed from piezoelectric elements and hinges are provided between the pivot shaft and the sliders. For faces of a plurality of magnetic disks, recording and/or reproduction operations can be performed simultaneously by integral tracking control of the sliders by the first driving apparatus and individual tracking control of the sliders by the second driving apparatus.

Abstract: In a head displacement measuring method, prior to actual data recording or data reproduction, either one of the recording head and the reproducing head is wobbled, and the test data is recorded in the disk-shaped recording medium by the recording head. Then, the test data is reproduced from the test data by the reproducing head, and displacement between the recording head and the reproducing head is detected on the basis of the reproduced test data. Thus, the displacement may be detected more easily with higher precision than with the conventional optical detecting method.

Abstract: A magnetic disk drive device that includes a disk-shaped medium with a magnetic film formed on a surface for recording or reproducing information, and a magnetic head for recording on and reproducing information from the disk-shaped medium. The disk-shaped medium has a data recording region and a control signal recording region. The data recording region is impressed to have convex recording regions for recording data and concave guard bands for separating adjacent recording regions. The control signal recording region has impressed concavities and convexities representing tracking marks (for effecting tracking control of the magnetic head), track number indicating marks and track numbers (for identifying the tracks), and clock marks dividing one circumference into equal intervals along a path of angular movement of the magnetic head.

Abstract: A disc substrate molding metal mold apparatus adapted for molding synthetic resin material to carry out molding of disc substrate of an information signal recording medium. This metal mold apparatus is adapted so that smoothing layers of metal are integrally formed on the molding plane surface sides of a first metal mold serving as the fixed side and a second metal mold serving as the movable side which are butted to each other to constitute a molding portion for molding disc substrate, and uneven patterns corresponding to information signals, etc. formed at the disc substrate are directly formed at the metallic layers, thus to carry out molding of disc substrate in which the surface is flattened with high accuracy, and uneven patterns of the metal mold side are transferred without allowing local undulations and/or projections occurring on the disc surface to take place.

Abstract: A magnetic disk drive device that includes a disk-shaped medium with a magnetic film formed on a surface for recording or reproducing information, and a magnetic head for recording on and reproducing information from the disk-shaped medium. The disk-shaped medium has a data recording region and a control signal recording region. The data recording region is impressed to have convex recording regions for recording data and concave guard bands for separating adjacent recording regions. The control signal recording region has impressed concavities and convexities representing tracking marks (for effecting tracking control of the magnetic head), track number indicating marks and track numbers (for identifying the tracks), and clock marks dividing one circumference into equal intervals along a path of angular movement of the magnetic head.

Abstract: In a head displacement measuring method, prior to actual data recording or data reproduction, either one of the recording head and the reproducing head is wobbled, and the test data is recorded in the disk-shaped recording medium by the recording head. Then, the test data is reproduced from the test data by the reproducing head, and displacement between the recording head and the reproducing head is detected on the basis of the reproduced test data. Thus, the displacement may be detected more easily with higher precision than with the conventional optical detecting method.

Abstract: A step h is provided between a recording region 2 including servo patterns Ps1, Ps2 and the recording track pattern Pw and a non-recording region 3 except the servo patterns Ps1, Ps2 and the recording track pattern Pw. A relation between a servo pattern width Ts and a track pitch Tp is set to be Tp(n-0.1).ltoreq.Ts.ltoreq.Tp(n+1), while a relation between a magnetic readout width Wr of the magnetic head and the track pitch Tp is set to be 0.9 Tp.ltoreq.Wr.ltoreq.1.1 Tp. A dead zone in a tracking error signal indicating a position of a magnetic head is to be eliminated, thus rendering it possible to position the magnetic head accurately and speedily.

Abstract: A recording and reproducing device having electro-conductive layers corresponding to track patterns arranged on a recording medium. A slider member of a head is provided with at least a pair of electrodes for use in detecting an electrostatic capacitance. Tracking of the head is controlled by the electrodes.

Abstract: A disc-like recording medium is disclosed in which pre-formatted data such as clock information, servo information or read-only information are formed in advance, and in which the pre-formatted data are formed along locus of rotation of a rotating head actuator for reading information therein. In this recording medium, a radial array of base points such as clock marks and servo marks is formed along the locus of rotation of a recording/reproducing head of the rotating head actuator, the rotating head actuator being provided with the recording/reproducing head via a gimbal spring on the distal end of an arm thereof with a supporting shaft as the center of rotation.

Abstract: A data pattern generator generates pattern data corresponding to a pre-formatted data pattern and supplies the pattern data to a disc-like recording medium producing apparatus for forming the pre-formatted data pattern, such as clock information, servo information and read-out information in a disc-like recording medium. The data pattern generator includes a first memory unit for storing therein as a data array at least part of a data pattern formed on a disc-like recording medium, and a second memory unit for storing therein an order for outputting the data array or a coordinate for outputting the data array. The data array is re-arrayed in accordance with an angle of rotation of the disc-like recording medium and then is output.

Abstract: Described herein is a rotational bearing system incorporating a ball bearing to support a shaft or housing in freely rotatable state through rolling contact with the ball bearing, the rotational bearing system comprising: vibratory elements adapted to excite in resonant vibration a fixed shaft or a fixed housing in rolling contact with the ball bearings thereby to lower the frictional resistance of the ball bearing.

Abstract: A rotational bearing system incorporates a ball bearing to support a freely rotatable shaft or housing through rolling contact with the ball bearing, the rotational bearing system comprises: vibratory elements adapted to excite in resonant vibration a fixed shaft or a fixed housing in rolling contact with the ball bearings to lower the frictional resistance of the ball bearing.

Abstract: A combinatorial weighing apparatus has a plurality of pool hoppers associated with automatic weighing units, respectively, for weighing batches of articles which have been supplied from a supply unit into the pool hoppers. After the batches of articles have weight, which is close to preset weights, the batches of articles are fed into weighing hoppers. Weight values obtained by the weighing hoppers are computed in various combinations by a computer to find the combination of weights which is equal or closest to a preset weight.