Mitsumi Electric Company Ltd.

Other

Ken'ichi Hori

Ken'ichi Furukawa

Satoru Manabe

Kouji Teranishi

Atsushi Kirii

Kazutomo Imi

Tsukasa Yamada

Hisamichi Sekine

Kazuya Okano

In order to fix a laser diode to an optical base , a plurality of threaded pins are at first fixed to the optical base by the use of, for example, an anaerobic adhesive. Then, the laser diode is faced to the optical base in an area between the threaded pins. The laser diode is adjusted in position and angle with respect to the optical base by, for example, 5 axes 3D adjustment. Thereafter, the laser diode is fixed to the threaded pins by the use of solder pieces

Method of fixing a laser diode to an optical base and optical pickup using the optical base

Disposed in a corner portion formed by a base plate ( ) and a vertical wall ( ) with being always pressed against the corner portion by a presser bar spring ( ), a lens holder ( A) has an adjustment groove ( Aa) extending in a direction perpendicular to the vertical wall. The adjustment groove ( Aa) has a taper shape where a width thereof becomes narrower in proportion to near to the vertical wall and the width thereof becomes wider in proportion to apart from the vertical wall. By moving an adjustment pin ( ) with the adjustment pin inserted in the adjustment groove ( Aa) through a hole ( ) formed in the base plate, the lens holder is moved along an optical axis (OA) of a laser beam, thereby adjusting a position of a beam spread lens (BSL) without a center axis (CA) thereof out of the optical axis.

Lens holder having an adjustment groove of a taper shape

In an optical pickup ( ) in which an objective lens ( ) is moved in a focusing direction by the use of a focusing coil ( ) and first and second magnetic circuits ( ) coupled to the focusing coil, the first and the second magnetic circuits have a first and a second magnetic flux density, respectively. The objective lens is held by a lens holder ( ) which is elastically coupled to a damper base ( ) through a suspension member ( ) to be movable in the focusing direction. The lens holder has a first part and a second part which are spaced from each other. In cooperation with the focusing coil, the first and the second magnetic circuit generate first and second force urging a first and a second part of the lens holder in the focusing direction, respectively.

Optical pickup capable of preventing tilting variation of an optical axis of an objective lens during movement thereof

A disk device for reproducing information and/or for recording information having a casing in which all parts of the disk device are included. The casing includes a number of first bosses and a recording/reproducing unit. The recording/reproducing unit includes at least a disk motor and an optical head. The optical head accesses the disk to reproduce information from the disk and/or record information in the disk. The recording/reproducing unit is arranged to have corners at positions corresponding to the first bosses of the casing. A plurality of vibration absorbing parts are provided and arranged at corners of the recording/reproducing unit. The vibration absorbing parts are also fixed to the first bosses to absorb vibrations of the recording/reproducing unit. The recording/reproducing unit further includes a chassis having mounting holes at the corners thereof. Each vibration absorbing part is respectively fitted to a periphery of one of such mounting holes.

Disk device having vibration absorbers for providing a small-height structure

A hole portion of a supporting frame is formed so as to permit a positional deviation of a suspension wire deviated from a normal position in at least one of tracking and focusing directions.

Object lens supporting unit capable of offsetting positional deviation of the lens caused by warp of suspension wire and method of assembling the unit

In an optical pickup (,) in which an objective lens (,) is held by a lens holder (,) elastically suspended by a damper base (,) through a conductive wire (,), the damper base has a base body (,) and is provided with a first and a second conductive land (,) attached directly to a principal insulation surface of the base body. The first conductive land is electrically connected to the conductive wire. The second conductive land is electrically connected to the first conductive land and is for being electrically connected with a flexible circuit member such as an FPC (,).

Optical pickup for enabling accurate measurement of various characteristics thereof without increasing the number or parts

A disk device includes a drive mechanism having at least a disk motor and an optical head, the disk motor rotating a recording disk, and the optical head accessing the disk to reproduce information from the disk and/or record information in the disk. A first printed circuit board controls the disk motor and the optical head of the drive mechanism, the first printed circuit board receiving signals from the optical head and/or sending signals to the optical head to perform the reproducing of information and/or the recording of information. The disk device further comprises a second printed circuit board electrically coupling the drive mechanism to the first printed circuit board, the second printed circuit board including a connector coupled to wire patterns of the signals received and/or sent by the first printed circuit board, and the connector being coupled to the first printed circuit board.

Disk device having a drive unit for providing a small-height structure

In an optical lens, a projection is formed on a peripheral surface of a lens body and protrudes to a radial direction of the lens body. The lens body has an outside diameter smaller than a predetermined inside diameter of a cavity of a lens holder. The projection interferes with a fitting of the lens body in the cavity without resistance. When the lens body is pressed in the cavity, the projection is deformed by the lens holder and follow the lens body fitting in the cavity.

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Kawasaki, Japan

Ken'ichi Hori