Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Junya Aso

Shuichi Nagai

Masaru Shiraishi

Yutaka Murakami

Hiroshi Yamamoto

Takashi Haruguchi

Kenichi Nakano

Fuminobu Furukawa

Tadashi Maki

Toshihiro Koga

Takuma Katayama

Hideo Yamaguchi

An encoder includes: a rotating plate; an irradiator that irradiates the rotating plate with light; and a light receiver that receives the light which has been emitted from the irradiator and traveled via the rotating plate. The rotating plate includes at least one curved surface, and the irradiator simultaneously irradiates each of a plurality of surfaces including the curved surface with light.

Encoder

Provided is an encoder capable of achieving high position resolution without being finely divided, and capable of detecting a rotation angle or the like with high sensitivity. The encoder includes: rotary plate having a plurality of reflection structures repeatedly formed and code including light reflector; irradiator that irradiates the plurality of reflection structures with light; and light receiver that receives light reflected by the plurality of reflection structures. Each of the plurality of reflection structures has a surface in a convex shape, and each of the plurality of reflection structures has a width that is an integral multiple of a width of light reflector.

An advantage of the present invention is that it provides an optical pickup device including a first condensing member that condenses light from a first light source; a second condensing member that condenses light from a second light source; a holder that has the first and second condensing members attached thereto; a plurality of tracking coils that drive the holder in a tracking direction of an optical disk; and a plurality of focus coils that drive the holder in a focus direction of an optical disk. The plurality of focus coils are disposed in the holder such that virtual center axes for winding coil are set to be substantially perpendicular to the optical axes of the first and second condensing members, and are disposed in four direction such that the region in which the first and second condensing members are attached is surrounded in a rectangular shape. The tracking coils are disposed in the holder such that virtual center axes for winding coil are set to be substantially perpendicular to the optical axes of the first and second condensing members, and are disposed between the first and second condensing members in a tangential direction.

Optical pickup device and optical disk drive

The present invention provides an optical pickup device comprising a light condensing means for condensing light emergent from a light source to an optical disk, a light condensing holder on which the light condensing means is mounted, a suspension holder for elastically supporting the light condensing holder, a focus coil mounted on the light condensing holder, a tracking coil mounted on the light condensing holder, and a magnetic field impression means for impressing a magnetic field upon the focus coil and the tracking coil, wherein the tracking coil is composed of a first to a third tracking coil portion combined with each other.

Optical pickup device and optical disk device

An optical pickup apparatus suited for reducing the size and thickness and capable of performing a tilt control of an objective lens with ease, and an optical disk apparatus. The optical pickup apparatus comprises: an objective lens for focusing a beam emitted from a light source onto an optical disk; a lens holding cylinder for holding the objective lens; wires and elastic tilt members for elastically supporting the lens holding cylinder so that it can be moved; and a yoke base for fixedly supporting the wires and for fixedly supporting magnets, the magnets being adapted to movably drive the lens holding cylinder; wherein the lens holding cylinder has a circular space portion and an almost rectangular opening portion in which the magnets are inserted, the circular space portion being adapted to hold the objective lens and guide the beam emitted from the light source to the objective lens; wherein the wires have one end thereof secured to a suspension holder and the elastic tilt members have one end thereof secured to a nearly central part, with respect to a tangential direction, of the almost rectangular opening portion of the lens holding means; wherein the lens holding cylinder is supported so that it can be pivoted in the tangential direction about the elastic tilt member as a rotating center.

Growing community of inventors

Fukuoka, Japan

Junya Aso