Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Panasonic Intellectual Property Management Co., Ltd.

Satoshi Obase

Tohru Nakamura

Hiroaki Suzuki

Hironori Tomita

Takuya Wada

Koichi Muramatsu

Toshiaki Takasu

A speaker unit incorporated in a housing of an earphone includes: a frame having a cylindrical shape; a diaphragm emitting sound; and a board to which a wiring line of a coil provided to the diaphragm is connected. The frame has a space inside, and the diaphragm and the board are placed inside the frame with the space interposed between the diaphragm and the board.

Speaker unit and earphone

In an optical pickup device, a supporting basethat has a main-shaft bearingwith two concentric round holes to pass a main shaftthrough is formed out of a synthetic resin. On the other hand, an optical base, which has a sub-shaft bearingto pass a sub-shaftthrough and which supports a light emitter, a beam splitter, a collimator lensand a photodetector, is formed by metal die casting process. And a pickup frameis formed by bonding the supporting baseand the optical basetogether with an adhesive.

Pickup frame and optical pickup device

A lens holder 2 holds an objective lens 1. Wires 5a.about.5d movably support the lens holder 2 relative to a stationary member 6 in a tracking direction and in a focus direction. The wires 5a.about.5d are integrally formed with the lens holder 2 and the stationary member 6 and one end and the other end of each of the wires are buried in the lens holder 2 and the stationary member 6. At a time of the integral molding, parts of the buried portions of the wires 5a.about.5d are exposed in notches 2a.about.2d and 6a.about.6d to be in contact with a mold for molding, thereby injection pressure of a molding material is received by the mold. This makes it possible to prevent deformation of the wires 5a.about.5d due to the injection pressure of the molding material, resulting in reducing inclination during actuation and degradation of frequency response characteristic.

Objective lens actuator and method for producing the same

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Osaka, Japan

Satoshi Obase