Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Syougo Horinouchi

Kouki Kojima

Hideaki Horio

Taiichi Mori

Shohei Inoue

Hiroshi Shibata

Akihiro Arai

Satoshi Kiyomatsu

Shouhei Inoue

The recording and reproducing apparatus has rotary drive unit (a motor) that rotationally drives a multilayer recordable recording medium; a reference-light-side recording and reproducing lensand a recording-light-side recording and reproducing lensthat are disposed oppositely to the recording mediumwhich is rotationally driven by the rotary drive unit, an address detection lensthat is disposed opposite the recording mediumand that is provided separately from the recording and reproducing lensesand; a light sourcefor recording and reproducing purpose that supplies recording reproduction light to the recording and reproducing lensesand; and the address light sourcethat supplies address light to the address detection lens. The apparatus is configured in such a way that light whose center axis portion is optically hollow is supplied from the reference-light-side recording and reproducing lensto the recording mediumduring reproducing operation.

Recording and reproducing apparatus

An optical pickup device includes a first laser element that emits first laser light, a second laser element that emits second laser light of which the wavelength is longer than that of the first laser light, an optical path composition element that composes the first laser light and the second laser light to one optical path, a wavelength selective element that acts on the composed first or second laser light; and an objective lens that condenses the first laser light and the second laser light on an optical disk. The magnitude of the power of the wavelength selective element as a lens with respect to the second laser light is larger than the magnitude of the power of the wavelength selective element as a lens with respect to the first laser light. Accordingly, it may be possible to reduce the optical pickup device and the optical disk apparatus in size.

Optical pickup device and optical disk apparatus

Then, in order to achieve the above-described object, in the optical disk of the present invention, while micro-hologram layersandmade of plural layers are provided in an inner portion of a plate bodyalong a thickness direction of the plate body, dimensions of micro-hologramsalong the thickness direction of the plate body, which configure the micro-hologram layerformed on the side of one surface of the plate bodywithin the micro-hologram layersandconstructed of the plural layers, are made smaller than dimensions of micro-hologramsalong the thickness direction of the plate body, which configure a micro-hologram layerformed on the side of an inner layer of the plate body

Optical disk, recording/reproducing method thereof, and optical disk apparatus with employment of optical disk

A recording apparatus includes a first light source irradiating first laser light, a second light source irradiating second laser light, an optical spatial modulating unit applying information to the first laser light, and an objective lens collecting the first laser light and the second laser light at different positions on the same optical axis. A hologram recording operation uses a first optical path and a second optical path. The information light is conducted to the objective lens along the first optical path. The reference light is conducted to the objective lens along the second optical path. At the same time, an address/servo control operation is carried out by employing a third optical path along which the second laser light is conducted to the objective lens. The DVD recording operation uses the second optical path. The CD recording operation uses the third optical path.

Recording apparatus and information processing apparatus equipped with the same

An optical pickup for use in optically recording or picking up information on and from a recording medium using a light-emitting device. The optical pickup comprises first and second light reflecting surfaces disposed in opposed relation to each other, the first reflecting surface reflects a light beam from the light-emitting device and the second reflecting surface reflects the light beam reflected from the first reflecting surface. Around the first reflecting surface there is provide a grating lens which condenses the light beam reflected from the second reflecting surface to be focused on the recording medium. The light beam from the recording medium is reflected by the second reflecting surface to be directed to the first reflecting surface. The first reflecting surface diffracts the reflected light beam from the second reflecting surface toward a light receiving device to read the information concurrently detecting focusing and tracking error signals. This arrangement can achieve the size-reduction of the optical pickup.

Optical pickup having a transparent lens member with two reflecting

Not more than one compound holographic optical element is provided on an optical path starting from a semiconductor laser chip and arriving at a photo detector via an optical disk. A hologram pattern of this compound holographic optical element is the superposition of a first hologram pattern, converging a laser beam emitted from the semiconductor laser chip onto the optical disk, and a second hologram pattern, diffracting the laser beam reflected at the optical disk toward the photo detector and changing it into a focusing beam. This single holographic optical element not only realizes the convergence of the laser beam onto the optical disk and/or the photo detector and the differentiation of going and returning optical paths but reduces the size and production cost of the optical pick-up apparatus.

Compound holographic optical element with two superposition hologram

Optical pickup for information recording/reproducing apparatus having

Optical pickup for information recording/reproducing apparatus

Optical pick-up apparatus

An optical pickup to be used in an optical disc apparatus for optically recording and reproducing information on and from an optical disc. The optical pickup is arranged such that a laser light from a semiconductor laser is reflected plural times within an optical system and then focused on the optical disc and the light from the optical disc is diffracted by a hologram and then received by a light-receiving device for reproducing the information recorded on the optical disc. This arrangement can achieve the size-reduction of the optical pickup concurrently with obtaining a necessary optical path length.

Growing community of inventors

Fukuoka, Japan

Syougo Horinouchi