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Optical head and information recording/reproducing apparatus

A technology of optical head and recording medium, which is applied in the direction of recording/reproducing by optical method, optical recording head, beam guiding device, etc., which can solve the problems of difficult to obtain signals, output signals buried in noise, etc.

Inactive Publication Date: 2007-01-31
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] Therefore, during focusing / tracking, it is difficult to obtain signals from different areas or crossing areas, so there is a problem that the output signal may be buried in noise

Method used

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  • Optical head and information recording/reproducing apparatus
  • Optical head and information recording/reproducing apparatus
  • Optical head and information recording/reproducing apparatus

Examples

Experimental program
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Embodiment Construction

[0023] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. A digital camera device having a large-capacity hard disk is taken as an example of the embodiment.

[0024] figure 1 An example of an information recording / reproducing device (optical disc device) according to an embodiment of the present invention is shown.

[0025] exist figure 1 The optical disc device 1 shown in includes an optical pickup (optical head unit) 11, which can record information in an unillustrated recording layer (organic thin film, metal thin film or phase change film) of a recording medium (optical disc) D. recording, reading information from the recording layer, or erasing information recorded in the recording layer. In addition to the optical head unit 11, the optical disc device 1 has an unshown optical head moving mechanism that moves the optical head unit 11 along the recording surface of the optical disc D and an optical disc m...

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Abstract

By using one embodiment of an invention, a diffraction pattern of a diffraction element or hologram polarization element (24) to guide a reflected laser beam divided into a predetermined number is suitably combined as one body in a photodetector (26), and an optical head unit (11) is easily designed to obtain a focus error signal, a track error signal, a correction track error signal (in a system with a lens shift), and a reproducing signal (RF) from a laser beam reflected on an optical disc. Therefore, when reproducing information from a recording medium of optional standard, it is possible to provide an optical head unit and optical disc apparatus which provides a stable reproducing signal regardless of the standards of recording media.

Description

technical field [0001] The present invention relates to an optical disc device which records information in an optical disc (optical information recording medium) or reproduces information from the optical disc, and an optical head unit incorporated in the optical disc device. Background technique [0002] A long time has passed since the commercialization of optical discs capable of recording or reproducing information in a non-contact manner using laser beams and optical disc devices (optical disc drives) capable of recording or reproducing information in or from optical discs (recording media). Optical discs called CDs and DVDs with several recording densities have become widely available. [0003] Recently, an ultra high density optical disc (high density digital versatile disc, hereinafter referred to as HD DVD) that records information using a laser beam having a blue or blue-violet wavelength to increase recording density has been put into practical use. [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/135G11B7/13G02B5/32
CPCG11B7/094G11B7/0901G11B7/131G11B2007/0006G11B7/1353G11B7/09G11B7/133
Inventor 岩田胜雄永田一博
Owner KK TOSHIBA