Sanyo Electric Co., Ltd.

Chikashi Yoshinaga

Kenichi Takeuchi

Ryoichi Kawasaki

Noriyoshi Ooyama

Sadao Iizuka

Hideyuki Saikawa

Nobuyuki Nakasawa

Yasuhide Kogo

A mounting structure of an optical element, includes: an optical element; an elastic member usable when the optical element is mounted; and a holding unit configured to be mounted with the optical element and the elastic member, the elastic member configured to be pressed into the holding unit, the holding unit configured to be mounted with the optical element by use of the elastic member.

Elastic member, mounting structure of optical element, and pickup apparatus having the same

An optical pickup apparatus comprising: a photo detector configured to receive light reflected from a medium; a housing mounted with the photo detector; and a projecting portion projecting from the housing, the projecting portion including a displacement preventer configured to prevent displacement of the photo detector or an adhesive relative to the housing, the displacement preventer including a fixing portion formed to extend along a plurality of directions, the photo detector being provided on the housing by applying the adhesive to the displacement preventer.

Optical pickup apparatus

An optical pickup device having a lens through which light transmits, a holder to which the lens is mounted, a position adjusting member which is mounted on the holder, and a housing to which the holder is mounted has a structure to allow adjustment of a mounting position of a lens assembly formed by mounting the lens and the position adjusting member on the holder when the lens assembly is assembled in the housing. In this manner, the lens can be mounted to the housing with high precision.

Optical pickup device and manufacturing method thereof

An optical pickup apparatus comprises a photo detector that receives light reflected from a medium; and a housing that is mounted with the photo detector. The photo detector is fixed to the housing with the use of an adhesive to mount the photo detector on the housing. The housing is provided with a displacement preventer that prevents displacement of the photo detector or the adhesive relative to the housing. The displacement preventer has fixing portions that extend along a plurality of directions. The photo detector is mounted on the housing by applying the adhesive to the displacement preventer.

A fixture plate is fixed by a screw onto an optical housing of the optical head device at a portion corresponding to where a monitor signal path portion and an act signal path portion are arranged overlapping one another. The two signal path portions are portions of two types of signal paths discretely formed on a flexible wiring board. The fixture plate is composed of a conductive material. One of the monitor signal path portion and the act signal path portion is covered by the fixture plate and fixed by a screw onto the optical housing together with the fixture plate, while the other of the monitor signal path portion and the act signal path portion is hooked in place by a hook provided on the fixture plate. The fixture plate is interposed between the monitor signal path portion and the act signal path portion.

Wiring layout structure for optical head device

The height of a tracking coil in an objective lens driving device having a cover over a magnetic circuit is freed from limitations imposed by the cover, so that an effective length of the tracking coil can be ensured. Magnetsgenerating an effective flux and facing yokesfacing the magnets are provided such that effective edges of a focusing coiland a tracking coilare located in an air gap. A coveris provided over the top surface of the magnetsand the facing yokes. The coverhas a notch formed for exposing the tracking coilso as to avoid limiting the height of the tracking coil, thereby securing an appropriate effective length of the tracking coilwithin the effective flux.

Objective lens driving device with cover having an opening for exposing a tracking coil

A yoke constituting a magnetic actuator for driving an objective lens has a plurality of arms arranged in a plane intersecting the optical axis of the lens perpendicular thereto. An optical system including the objective lens is disposed at one side of the yoke and has the outer peripheral portion of the lens positioned partly in the space between adjacent two arms. The lateral width of the device is decreased by an amount corresponding to the lap of the lens over the yoke. A cover plate is secured to the upper surface of the magnetic actuator in intimate contact with the upper end faces of the yoke arms to give enhanced rigidity to the device.

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Ota, Japan

Chikashi Yoshinaga