Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Masanari Mohri

Tohru Nakamura

Eiji Ohno

Kazuhiro Hayashi

Hironori Tomita

Osamu Mizuno

Kanji Wakabayashi

Hiroshi Yamamoto

Hideki Aikoh

Takeo Santo

Teruyuki Takizawa

Osamu Kajino

Hitoshi Fujii

Noboru Kikuchi

Yoshiaki Komma

Shinichi Tanaka

Hiroyuki Yamaguchi

Seiji Nishino

Hidenori Wada

Akira Kurozuka

Keiichi Matsuzaki

Kenichi Kasazumi

Shinichi Kadowaki

Tetsuo Saimi

Joji Anzai

Shinichi Yamada

Hiroshi Obi

Masaya Kuwahara

Masuo Maruyama

Akihiro Sakaguchi

Yasuo Nishihara

Masayoshi Shioya

Kenichiro Urairi

Daisaburo Kubota

Atsushi Ishizuka

Takayuki Kojima

An image projection apparatus according to the present invention includes a light source for outputting laser light and a mirror section for reflecting and projecting the laser light having been output from the light source, and displays an image with at least a portion of the projected laser light. The image projection apparatus includes a detection section for detecting at least a portion of the laser light returning from a projection direction of the laser light, and a calculation section for determining an image displayable region based on the detected light. The mirror section reflects at least a portion of the laser light returning from the projection direction of the laser light so as to be led into the detection section.

Image projection device including determining displayable region

The present invention provides an optical information medium capable of suppressing the influence of reflection light from an unnecessary information recording face and effectively eliminating spherical aberration at the time of recording/reproducing information to/from a recording medium having a plurality of information recording faces. When reflectance of an information recording face is &#x3b1;h and transmittance between information recording faces is th, &#x3b1;h and th of the optical information medium are set so as to satisfy ((&#x3b1;(h&#x2212;1)&#xd7;&#x3b1;(h&#x2212;2))/(th&#xd7;&#x3b1;h))&#x3c;0.01.

Optical recording medium, method for recording/reproducing information to/from optical recording medium and apparatus for recording/reproducing information

A disc-shaped optical data recording medium has a signal recording layer for reading and/or writing data using light, and a 10 &#x3bc;m to 200 &#x3bc;m thick transparent protective layer disposed over the signal recording layer. The optical data recording medium includes a protrusion projecting from a surface of the transparent protective layer on a light-incidence surface side to which light is emitted to the signal recording layer. The protrusion is disposed in an area between a center hole and a clamping area where the optical data recording medium is held when reading and/or writing data in the signal recording layer.

Optical data recording disc with protrusion between clamping area and center hole

Optical data recording medium with protrusion bonded between center hole and clamping area

A light beam emitted from a light source is focused by an objective lens onto an information recording surface of an optical information recording medium. The objective lens has a substantially truncated-cone-shaped portion on its surface on the side of the optical information recording medium. This makes it possible to prevent interference with a DVD-RAM cartridge and ensure optical compatibility with a BD and a DVD.

Objective lens, optical head and optical information recording/reproducing apparatus

Optical data recording medium and manufacturing method for the same, and a method for clamping the optical data recording medium

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

In an objective lens driving device having a movable portion including an objective lens held by a lens holder, a damage prevention system for preventing the objective lens or a disk from being damaged when the objective lens or the lens holder collides with the disk is provided. The damage prevention system is constituted by inserting a protecting member formed of an elastic member in a fitting portion on an upper surface of the lens holder while being deformed. In this manner, it is possible to generate a sufficient holding power with respect to the protecting member without using glue or the like.

Objective lens driving device

An objective lens driving apparatus is improved in a tracking drive sensitivity, and is capable of suppressing the occurrence of a tilt when a moving member is driven for tracking and focusing motions. To achieve this, the objective lens driving apparatus comprises: a substantially rectangularly shaped focusing coil and a substantially rectangularly shaped tracking coil, both arranged in the same plane, and fixed to a lens holder to drive the lens holder on which an objective lens is held; and a magnet having mutually opposite magnetic poles arranged at positions opposite winding portions of the focusing coil which lie on two sides thereof extending perpendicularly to a focusing direction, and also having mutually opposite magnetic poles arranged at positions opposite winding portions of the tracking coil which lie on two sides thereof extending perpendicularly to a tracking direction.

Objective lens driving apparatus

An objective lens assembly includes: at least two groups of lenses having a common optical axis: and at least two lens holders for respectively holding the at least two groups of lenses, wherein each of the lens holders has an end face perpendicular to the optical axis, and the lens holders are positioned such that the end face of one of the lens holders faces the end face of the other lens holder, and a gap between these end faces is filled with an adhesive agent for adhering the lens holders to each other.

Assembled lens, optical head and optical recordable player with them

Optical disks compliant with different standards are recorded or reproduced by a single recording/reproducing apparatus by a first step of determining a substrate thickness of the disk based on a focusing error signal, when a focusing section for bringing the light beam into a focus on the disk is moved in such a way as to approach or withdraw from the recording surface of the disk; a second step of performing any one step of determining the number of recording surfaces of the disk when the focusing section is moved in such a way as to approach or withdraw from the recording surface of the disk, and determining whether or not the disk can be recorded and reproduced using a tracking error signal detected when the light beam crosses the track.

Disk type determination method

Growing community of inventors

Kobe, Japan

Masanari Mohri