Hitachi Media Electronics Co., Ltd.

Ryuichiro Mizuno

Katsuhiko Kimura

Hidenao Saito

Jun Hato

Yoshihiro Sato

Seiichi Kato

Hiroaki Furuichi

Seiichi Katou

Manabu Ochi

Kazuhiko Ito

Akiko Mizushima

Yoshihiro Satou

Tamotsu Nishida

In an optical pickup equipped with a semiconductor laser, electro-optical components such as a lens, and an objective lens drive device, the objective lens drive device includes objective lenses, a holder holding the objective lenses, a focusing coil, and tracking coils. The focusing coil is wound in parallel to the optical surface of the objective lens, and formed in a parallelogram shape having inclined portions provided near the tracking coils. The two tracking coils are placed on diagonal portions of the lens holder.

Objective lens drive device and optical pickup

In an optical pickup device for use in recording and reproducing on an optical recording medium, such as a CD or DVD, banks are formed on both sides of an adhesive agent application position for adhering an optical device, such as a photodetector or a laser diode, in an optical pickup case. At this time, a bank on the side of an optical path is formed higher than a height of an outer bank, and an adhesive agent is poured between the banks, to adhere the optical pickup case and the optical device.

Adhesive structure of optical device, adhesion method, and optical pickup device

An objective lens actuator, for driving an objective lensfor focusing lights upon a recoding surface of an optical disc, comprises a moving part, which comprises the objective lensand a coil; a magnet, which is fixed on a yoke and drives the moving part; a plural number of elastic support parts, each of which supports the moving partat an end thereof; a first fixing portionand a second fixing portion, which fix other ends of the plural number of elastic support partsand are disposed opposite to each other in a focus direction; and a moving mechanism, which is provided on the first and second fixing portionand, so that the first and second fixing portionsandcan move in the focus direction, relatively, and thereby providing the objective lens actuatorenabling to reduce the dynamic relative tilt between the optical disc and the objective lens(i.e., reducing the tilt of the objective lensin the tangential direction when operating), as well as, an optical pickup and an optical disc drive.

Objective lens actuator for enabling to reduce the dynamic tilt between optical disc and objective lens

The present invention provides an object lens actuator, an optical pickup, and an optical disk drive, which can increase the size of the object lens actuator driving a lens holder in the tangential tilt direction, and drive and control the lens holder with a small amount of drive current. An object lens actuator comprising a lens holder having an object lens and a first coil; a first magnet fixed to a yoke; plural elastic support parts for supporting said lens holder with a first fulcrum; a moving part for supporting said elastic support parts with a second fulcrum different from said first fulcrum, and a fixed part having a moving mechanism for moving said moving part, wherein said first coil and said first magnet constitute a first magnetic circuit, said first magnetic circuit makes said lens holder movable in a focusing direction, a tracking direction and a radial tilt direction of an optical disk for read/write, and said moving mechanism makes said moving part movable.

Object lens actuator, optical pickup and optical disk drive

The present invention has an object to provide an object lens actuator that reduces the amplitude of vibration of an object lens related to a torsional vibration of a lens holder and to enable a disc drive using the same to record information on a disc at high speeds. The above object has been achieved by placing the thickest one of the four walls, which are in an envelope of two opening portions provided in the lens holder and which are perpendicular to a flat plate between the two opening portions, in a position which is opposite to the object lens with respect to the center line between a first support member and a second support member which resiliently support the lens holder therebetween and which is opposite to the object lens with respect to the flat plate.

Object lens actuator and disc drive using the same

An object lens drive unit in which an undesired displacement or inclination of an object lens with respect to an optical disc is reduced. The position at which a lens holder for the object lens is supported by a pair of rod-shaped elastic support members in the focusing direction substantially coincides with the center of the tracking coil in the focusing direction.

Growing community of inventors

Fujisawa, Japan

Ryuichiro Mizuno