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Optical pickup and optical disc apparatus

An optical pick-up device and optical disc technology, which is applied in the direction of beam guiding device, optical recording head, head configuration/installation, etc., can solve problems such as tracking error, and achieve the effect of simple structure and stable servo control

Inactive Publication Date: 2010-03-03
SONY CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] However, in the push-pull method using only one beam, sometimes an error occurs in tracking due to the influence of lens movement

Method used

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  • Optical pickup and optical disc apparatus
  • Optical pickup and optical disc apparatus
  • Optical pickup and optical disc apparatus

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Embodiment Construction

[0059] Embodiments of the present invention will be described below, and the correspondence between the constituent elements of the present invention and the embodiments described in the specification or drawings will be described below with examples. This description is for confirming that the embodiments supporting the present invention are described in the specification or drawings. Therefore, even if there is an embodiment described in the specification or drawings but not described here as an embodiment corresponding to the constituent requirements of the present invention, it does not mean that the embodiment does not correspond to the constituent requirements. Conversely, even if an embodiment is described here as a part corresponding to a constituent requirement, it does not mean that the embodiment does not correspond to a constituent requirement other than the constituent requirement.

[0060] The first side optical pickup device of the present invention is an optica...

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Abstract

Provided is an optical pickup and an optical disc apparatus. According to the embodiments of the present invention, stable servo control can be exerted with a simple configuration. A light receiving part of the optical detection portion becomes a structure of arranging two regions by dividing the spot (180) in the tangent direction of the disc, the spot (180) becomes a shape non-symmetrical relative to a line segment passing through the center of the spot (180) and being parallel to the radial direction, and a shape non-symmetrical relative to a line segment passing through the center of the spot (180) and being parallel to the tangent direction. The movement of the spot position of the light beam in the radial direction is represented as the shape variation of the spot formed in the lightreceiving portion, so that the lens moving signal can be detected by differential operation of the signals output from the regions (K and L) of the light receiving part.

Description

[0001] This application is a divisional application of an application with a filing date of March 5, 2007, an application number of 200710080028.0, and an invention title of "Optical Pickup Device and Optical Disk Device". technical field [0002] The present invention relates to an optical pickup device and an optical disc device, and particularly relates to an optical pickup device and an optical disc device capable of performing stable servo control with a simple structure. Background technique [0003] In recent years, high-density / large-capacity optical discs such as DVD (Digital Versatile Disc: Digital Versatile Disc) have been put into practical use as high-density / large-capacity storage media, and information media handling large amounts of information such as moving images are widely used. [0004] In the past, in an optical pickup in an optical disc device for recording information on or reading information from an optical disc, a light beam is irradiated onto the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/09G11B7/135G11B7/13G11B7/1353G11B7/1381
Inventor 小林高志濑尾胜弘冈本好喜加藤典之
Owner SONY CORP
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