Kabushiki Kaisha Sankyo Seiki Seisakusho

Nidec Sankyo Corporation

Toru Kamada

Ikuo Kasuga

Fumio Kobayashi

Masayuki Ishikawa

Takeshi Ozawa

Akihiko Okumura

A gear mechanism may include a first gear, a second gear which is coaxially disposed with the first gear and is provided with a recessed part on an end face of a first gear side, and a torque limiter provided between the first gear and the second gear. The torque limiter includes inner teeth provided on a ring-shaped inner peripheral face of the recessed part, and a torque limiter member provided with an engaging claw capable of engaging with the inner teeth and integrally rotating with the first gear in the recessed part. The second gear is an inclined teeth gear whose teeth bottoms are inclined with respect to an axial line direction and teeth bottoms of the inner teeth are extended in parallel with the axial line direction. The gear mechanism may be utilized in a drawer drive device in a refrigerator which includes a motor, a rack linearly moved by the motor for moving a drawer in the refrigerator, an output gear engaged with the rack, and a rotation transmission mechanism for transmitting rotation of the motor to the output gear. The rotation transmission mechanism includes the gear mechanism and a worm gear.

Gear mechanism and drawer drive device in refrigerator

An optical pick-up device includes a driven portion including an optical system having an objective lens, driving member including a focus coil for driving the driven portion in a direction of an optical axis, a tracking coil for driving in a direction orthogonal to the optical axis and a magnet, wherein the tracking coil is provided on a point symmetrically with respect to a central shaft and the magnet is provided in such a position that a magnetic flux is linked to one of two coil sides for generating driving force in a tracking direction.

Optical pick up device

A magnetic piece,is provided in the almost central portion of a magnet,in a tracking direction. Therefore, the magnetic piece,is attracted to the almost central portion of the magnet,by the magnetic attraction of the magnet,and is held therein. In addition, when a lens holder,is set in a neutral position in a focusing direction, the magnetic pieces,are provided in the vicinity of both edge portions in the focusing direction of the magnet,, respectively. Consequently, the lens holder,is held in the balance position of the magnetic attractions for both magnetic pieces

Optical pickup device

An objective lens driving device includes drive coils mounted on one of a lens holder bearing an objective lens and a stationary member; magnets mounted on the other in such a manner that said drive coils are confronted with the magnets, and the lens holder is moved in a focusing direction and a tracking direction by application of current to the drive coils; and magnetic pieces arranged in magnetic circuits including the magnets, so that magnetic attraction forces acting on the magnetic pieces produce restoring forces two-dimensionally in the focusing direction and in the tracking direction to hold the objective lens at a neutral point. The magnetic pieces are so arranged that, at the neutral point, the drive coils are confronted straightly with the magnets.

Objective lens driving device capable of holding an objective lens at a

An objective lens driving device is disclosed, in which the objective lens is moved in the direction of the optical axis thereof by a thrusting force generated between a magnet for focusing and a driving coil for focusing to effect focusing and it is moved in the direction perpendicular to that of the optical axis thereof by another thrusting force generated between a magnet for tracking and a driving coil for tracking to effect tracking.

Growing community of inventors

Nagano, Japan

Toru Kamada