Kabushiki Kaisha Sankyo Seiki Seisakusho

Sankyo Seiki Mfg. Co., Ltd

K.k. Sankyo Seiki Seisakusho

Akira Miyamae

Ikuo Kasuga

Fumio Kobayashi

Hisao Isobe

Hajime Kinoshita

Tatuki Wade

An objective lens actuator including an objective lens holding body for holding an objective lens, and a sheetlike drive coil arranged on an outer circumferential surface of the objective lens holding body. The objective lens holding body is rotatable about a shaft and slidable along the shaft, and a vibration absorbing member is interposed between a portion of the objective lens holding body and the sheetlike drive coil, the portion being opposite to the objective lens with the shaft interposed therebetween.

Objective lens actuator

An objective lens drive device includes an objective lens holder, a fixing member, drive coils mounted on one of the objective lens holder and the fixing member; magnets mounted on the other, the magnets positioned in a face-to-face relationship with the drive coils and supplied with an electric current so as to drive the lens holder in both a focusing and a tracking direction, the magnets are magnetized with polarization at least in the focusing direction; and magnetic pieces placed in the magnetic circuits of the magnets relating to a focusing direction, wherein a two-dimensional restoring force is generated in the focusing and tracking directions by the magnetic attraction acting on the magnetic pieces so that the objective lens is held at the neutral point, at least one end portion of the magnetic pieces in the polarizing direction is wider than the middle portion.

Objective lens drive unit having shaped magnetic pieces for providing a

An optical pickup device operates to irradiate a disk with an optical beam from a light source by an objective lens and to detect the beam reflected from the disk by a light receiving element. A frame is provided for said device having an optical element fixed therein. The frame is formed with a press-fit hole into which the light source is press-fit and fixed so as to adjust the press-fit depth, thereby adjusting alignment between the optical pickup device and the disk.

Optical pickup device

Disclosed is an objective actuator comprising an object lens holder for holding an object lens, the object lens holder being mounted on a support shaft in a manner that the object lens holder is slidable along and rotatable about the support shaft; a drive coil mounted on the object lens holder; first yoke provided with drive magnets, the first yoke being mounted in such manner that the drive magnets confront with the drive coil, the first yoke having a center hole which is larger in diameter than the support shaft, the first yoke and the support shaft are integrally connected by molding; and shaft holding member defined by filling a resin at the center hole of the first yoke, the shaft holding member including a base portion.

Growing community of inventors

Nagano, Japan

Akira Miyamae