Matsushita Electric Industrial Co., Ltd.

Kenichiro Urairi

Yoshiaki Komma

Sadao Mizuno

Hideki Hayashi

Noboru Ito

Hiroshi Yamamoto

Kanji Wakabayashi

Masanari Mohri

Takao Hayashi

Hitoshi Fujii

Kazuhiko Fujikawa

Daisaburo Kubota

Yasumasa Shibata

Takayuki Kojima

An apparatus for driving an objective lens of the present invention includes: a base which is moved along an optical disk; an objective lens disposed so as to be opposed to the optical disk and having an optical axis in a vertical direction with respect to the optical disk, for optically recording information onto the optical disk or optically reproducing information from the optical disk; a holder portion for holding the objective lens; a plurality of elastic arms extending between the base and the holder portion in a tangent direction of the optical disk, for supporting the holder portion movably with respect to the base; and a driving portion for generating an electromagnetic force for moving the holder portion with respect to the base, wherein the elastic arms are disposed away from each other in a vertical direction, the base includes each movable portion for supporting one end of each of the elastic arms, and each of the movable portions is supported at each position in a vertical direction outside of one end of each of the elastic arms, so as to be elastically pivotable around each axis in a radius direction of the optical disk.

Apparatus for driving an objective lens utilizing flexible arms and pivotability mechanisms

An optical head apparatus which records or reproduces signals stably on optical disks having different thicknesses. A correction hologram element or a correction filter is provided between a light source and a 2-focus lens in order to decrease optical intensity at a portion distant from the optical axis or to change the optical path length. The light which passes the correction hologram element or a correction filter is converged by the 2-focus lens as a micro-spot on an optical disk. The 2-focus lens comprises a hologram lens which diffracts a part of the light beam and an object lens.

Correction element of lower light intensity around an optical axis of an

An optical head for reproducing data from first and second optical disks which are different from each other in at least one of a base material thickness and an available wavelength, includes: a first light source for emitting a first light beam, the first light beam being used for reproducing data from the first optical disk: an optical system designed to converge the first light beam onto the first optical disk in accordance with a base material thickness and an available wavelength of the first optical disk: and a second light source for emitting a second light beam, the second light beam being used for reproducing data from the second optical disk, wherein an optical path length between the second light source and the optical system is different from an optical path length between the first light source and the optical system, and wherein the optical system converges the second light beam onto the second optical disk.

Optical head for reproducing data from first and second optical disks

Correction elements to lower light intensity around an optical axis of

Optical head and optical data recording and reproducing apparatus having

In an objective holder actuator assembly comprising an objective, an objective holder, a bearing, a focusing control coil, a tracking control coil and a balancer, an acrylate resin member is disposed between an objective holder and focusing and tracking control coils and the objective holder is made of ceramic material to reduce the resonance peak values of the movable segment of the objective actuator at high-order resonance frequencies and increase the high-order resonance frequencies.

Objective actuator

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Yawata, Japan

Kenichiro Urairi