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Light detection device and light pick-up device

A light detection device and a technology of light detectors, which are applied to beam guiding devices, optical recording heads, recording/reproducing with optical methods, etc., can solve problems such as signal processing influence, signal deviation, and jitter deterioration, etc., and achieve lightening recording /replays the effect of the action's effect

Inactive Publication Date: 2008-07-23
SANYO ELECTRIC CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, there may be an influence on signal processing based on reflected light of 0-order light from the information surface L0 (for example, deterioration of jitter), and an influence on tracking control (for example, when using the differential push-pull method for tracking control time, the signal deviation based on the reflected light of ±1 order light)

Method used

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  • Light detection device and light pick-up device
  • Light detection device and light pick-up device
  • Light detection device and light pick-up device

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Embodiment Construction

[0030] At least the following will become clear from the description of this specification and the accompanying drawings.

[0031] ===Configuration Example of Optical Pickup Device===

[0032] refer to figure 2 The configuration of the optical pickup device 1 to which the photodetection device 2 according to the present invention is applied will be described. figure 2 It is a functional block diagram showing an example of the overall configuration of the optical pickup device 1 to which the photodetection device 2 according to the present invention is applied. and, figure 2 The optical pickup device 1 shown is a general optical pickup device to which the photodetection device 2 according to the present invention is applied, and is not limited to the optical pickup device 1 having this configuration. As long as it is an optical pickup device that focuses using a differential astigmatism method, the photodetection device 2 according to the present invention can of course b...

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Abstract

Disclosed is a light detecting device, in zero time light, positive high-order diffraction light with one or more times and negative high-order diffraction light with one or more time, a differential astigmatic method is used to focus the zero time light on one certain message panel of multiple disk medium, the invention is provided with a first light detecting machine, a second light machine and a third light machine, wherein light receiving areas of the second and the third light detecting machines are provided with other time light receiving area, and prohibited areas of light receiving are arranged on a portion of the other light receiving areas of the second and the third detecting machines.

Description

technical field [0001] The present invention relates to a photodetection device and an optical pick-up device. Background technique [0002] Currently, CDs (Compact Discs), DVDs (Digital Versatile Discs: Digital Video Discs), and the like are widely used as optical disc media for recording / reproducing information. The recording / reproduction of information on the optical disc medium requires that the focal point of the laser beam condensed by the objective lens be accurately focused on the information plane of the relevant optical disc medium. Therefore, on the information surface of the optical disc medium, the focus control for correcting the error when the focus of the laser light is out of focus is performed, and the error for correcting the error when the light spot focused on the information surface deviates from the predetermined track center is performed. track control. [0003] Also, focus control using, for example, a differential astigmatism method is known. In ...

Claims

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Application Information

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IPC IPC(8): G11B7/13G11B7/12G11B7/135
Inventor 新藤博之
Owner SANYO ELECTRIC CO LTD