Abstract: Provided is a reflector oscillating apparatus in which the positions of a reflector and a compensating plate are detected so as to perform positioning with a high degree of positional accuracy (closed-loop control). Further, since the reflector and the compensating plate are driven by a couple of forces, no reaction forces by drive forces are applied to a rotary shaft and a support section, and accordingly, it is possible to enhance the positioning accuracy and to realize a short transient time and a large amplitude. Further, the magnetic circuit is commonly used so that the dimensions of a motor, that is, the height thereof in particular, can be reduced, irrespective of a large drive force. Accordingly, the reflector oscillating apparatus can be greatly miniaturized. Further, by commonly using the magnetic circuit, the impedance of the coil can be reduced, thereby it is possible to drive the apparatus at a high speed with a low drive voltage.

Abstract: An in-line type magnetic head supporting apparatus of the present invention including a first fixed part secured to a magnetic head slider mounted with a magnetic head in a floatable manner, a second fixed part secured to a load beam which presses the magnetic head slider toward the magnetic disc, and a gimbal mechanism comprising a spring part connecting the first and second fixed parts and enabling the pitching and rolling movements of the magnetic head slider in the radial direction of the magnetic disc, and further includes a restricting mechanism for preventing the sideslip of a pivot formed on the first fixed part as a fulcrum for pitching and rolling movements. Furthermore, in order to increase the flexural rigidity of the spring part of the gimbal mechanism in the radial direction, its lateral length is enlarged and slits are formed in the spring part to reduce the torsional rigidity thereby to prevent the inteference of the pitching and rolling movements.

Abstract: An object lens head assembly for use with an optical recording disc comprises an information conversion apparatus for receiving an electrical signal bearing information to be written to the disc and outputting beams of light bearing the information to be written to the disc, and for receiving a beam of light bearing information read from the disc and outputting an electrical signal bearing the information read from the disc; a plurality of object lenses disposed along a diametrical direction of the disc for directing light onto a plurality of portions of the disc, respectively; a plurality of reflective mirrors for reflecting the light beam output from the information conversion apparatus toward a selected one of the object lenses; a linear motor for moving the object lenses along the diametrical direction of the disc; and a light beam shifting mechanism for shifting the light beam so that the light beam impinges upon a selected one of the reflective mirrors.

Abstract: A two-dimensional image pick-up device using a one-dimensional image pick-up element which is useful as an image reader. Drive coil type linear motors for driving an element moving carriage in the subscanning direction of the one-dimensional image pick-up element are disposed on both sides of the element moving carriage, enabling the deivce to be economically small-sized as a whole.

Abstract: A chopping secondary mirror system is provided, in which magnetic circuits of a driving motor for causing a secondary mirror to chop about its rotation axis are mounted to the secondary mirror via a driving motor mounting so that the magnetic circuits function as a balancing mass to position the center of gravity of a whole chopping section on said rotation axis. The driving motor mounting is secured to the secondary mirror at the center of the secondary mirror. Leaf springs are used as vibration damping springs of a reaction force compensator.

Abstract: The positioning control apparatus includes a feedback compensatory compensatory system for performing high-accurate positioning and a feedforward compensatory system for carrying out high-speed output response. The feedforward compensatory system is provided with a dynamic characteristic of an object to be controlled and a dynamic characteristic reverse to that of a control system by a feedback compensation. Transfer characteristic from a position command to an output of the object is assumed to be 1. As a result, there can be easily obtained a desired output response as well as a desired control input.

Abstract: An electromagnetic drive actuator including a magnetic circuit comprising at least one yoke having plate-shaped, L-shaped, E-shaped cross section or the like, at least one magnet mounted on the yoke and a magnetic flux extending from the magnet to the yoke, at least one coil arranged so as to cross the magnetic flux and produce a drive force in a direction crossing a plane including the magnetic path of the magnetic circuit when current is applied to the coil, and at least one magnetic shield member provided at the side portion of the coil to thereby prevent a counter drive force from being produced in a direction opposite to a desired direction of a drive force produced by the coil.

Abstract: A carriage assembly for use with an optical recording disc for optical recording and reproduction relative to the disc comprises a frame, an optical lens for projecting and receiving a light beam for the optical recording and reproduction, a carriage movably supported in the frame for supporting the optical lens relative to the disc, a vertical guide arrangement for permitting a movement of the optical lens relative to the carriage in a vertical direction relative the disc surface, a vertical drive arrangement for driving the optical lens in the vertical direction relative to the carriage, a radial guide arrangement for permitting said carriage to move in a radial direction of said optical disc, and a radial drive arrangement for driving the carriage in the radial direction of the disc.

Abstract: A carriage assembly for a disc operating apparatus comprising a frame, a carriage movably supported in the frame relative to the disc, an optical lens or magnetic head mounted on the carriage for recording and reproducing information on the disc, and a radial guide arrangement permitting movement of the carriage in a radial direction relative to the disc. The assembly also comprises a radial drive arrangement including an electromagnetic coil mounted to the carriage and a permanent magnet mounted to the frame. The permanent magnet is electromagnetically coupled with the electromagnetic coil for driving the carriage in the radial direction of the disc. The electromagnetic coil includes two sections which sandwich the carriage and are shaped to come into contact with each other at both sides thereof, whereby the cross section of the electromagnetic coil is hexagonal in a plane parallel to a surface of the disc. As a result, the dimensions in the radial direction of the carriage assembly are decreased.

Abstract: A head actuator for a disk drive is provided with a structural body integrally formed by a housing portion for rotatably supporting a moving part formed by a head for writing/reading data in/from a disk and a coil fixed therewith and a yoke portion for interlinking magnetic flux with the coil, which structural body is fixed to a base portion. By virtue of such structure, the resonance point of a vibration system of the head actuator can be increased in frequency thereby to stably and correctly locate the head on the disk. The structural body and base portion mount to each other on the surfaces which are substantially coplanar with the center of gravity and head arm direction of movement.

Abstract: A transducer carriage 1 is slidably mounted on and between parallel guide rails 2a, 2b by two spaced pairs of inclined bearing rollers 3a, 4a, 3b, 4b, on one side and a single intermediate pair of such rollers 3c, 4c on the other side. The lower intermediate roller 4c is elastically mounted to the carriage by a rubber shaft ring 9 and exerts a biasing force on its guide rail, to thereby maintain the remaining fixedly mounted rollers in stable contact with their associated rails.

Abstract: A carriage of a head positioning assembly is disposed along an edge of a magnetic disc so as not to come in contact with the magnetic disc, whereby the length of the winding bobbin of the voice coil can be elongated, so that a driving force generated in the elongated winding bobbin causes a magnetic read and write head to rapidly move to a position over an objective track on the magnetic disc.

Abstract: An improved carriage assembly for linearly reciprocating a data converter pickup or the like. Magnetic circuits are provided on each side of a carriage, and a driving coil wound on a transversely solid type coil bobbin which surrounds the carriage, is magnetically linked with the two magnetic circuits. Guide rails are provided between the carriage and the two magnetic circuits. The moving elements including the carriage, the driving coil, and the bobbin are supported on the guide rails for linear movement therealong by rollers.