Sanyo Electric Co., Ltd.

Noboru Onojima

Kenichi Imai

Toshio Enokido

Shingo Matsuzaki

Yasufumi Yamagishi

Akira Iijima

An objective-lens-driving apparatus comprising: a base opposed to a signal surface of an optical disc; an objective-lens holder including an objective lens, first and second focusing coils arranged across the objective lens in a tracking direction of the disc, first and second tracking coils arranged across the first-focusing coil in a tangential direction of the disc, and third and fourth tracking coils arranged across the second-focusing coil in the tangential direction, the objective-lens holder being supported on the base movably in a focusing direction of the disc and the tracking direction; and first to fourth magnets arranged on the base to be respectively opposed in the tangential direction to the first to fourth tracking coils, the first and second magnets each having two poles polarized in the tracking direction, magnetization widths of the two poles with respect to the first-focusing coil in the tracking direction being different from each other.

Objective lens driving apparatus

A pickup apparatus including: at least a coil constituting an actuator, a signal to be sent to the coil being obtained by calculation using an algorithm on the basis of at least one of a focus error signal and a tracking error signal.

Coil controlling for optical pick-up

An optical-member driving apparatus for laser radar, comprising: an optical-member integrated portion including an optical member and an optical-member mounted portion having the optical member mounted thereon; first erection members supporting the optical-member integrated portion; a relay portion to which the first erection members is connected; second erection members supporting the relay portion; and a fixed portion to which the second erection members are connected.

Optical member driving apparatus for laser radar

A lens holder is configured by coupling an upper piece and a lower piece. First bobbin portions around which respective tracking coils are wound are provided in one of the upper and lower pieces, and second bobbin portions around which respective focusing coils are wound are provided in the other one of the upper and lower pieces.

Objective-lens driving device utilizing tracking coils and focus coils arranged in series

An objective lens driving apparatus comprising: an actuator movable unit that is configured such that a driving coil is mounted on a lens holder with an objective lens, and is supported on an actuator frame displaceably and elastically; a magnetic circuit that includes a magnet fixed to the actuator frame to form an effective magnetic field for the driving coil; and a rolling canceling coil that is so mounted on the lens holder as to act on the effective magnetic field formed by the magnetic circuit so effectively that a driving force is generated in a tilt direction that cancels rolling generated when a drive signal is supplied to a tracking coil to drive the actuator movable unit in a tracking direction.

A laser radar driving apparatus applying a laser beam to a target object and detecting the laser beam reflected and returned from the target object to measure a distance to the target object, at least comprising: an optical member that the laser beam is applied to; a main body member that the optical member is mounted to; and a coil capable of manipulating the main body member, a drive assembly being configured with mounting the optical member and the coil to the main body member.

Laser radar driving apparatus

A pickup apparatus comprising a housing equipped with components for reading data on a medium, the housing being disposed with a bearing portion correspondingly to a shaft member supporting the housing movable, the bearing portion being disposed with a crack generation preventing portion that preventing the housing from becoming cracked when an impact is applied to the housing with the shaft member disposed in the bearing portion.

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Saitama, Japan

Noboru Onojima