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Optical pickup unit and information recording apparatus using the same

A technology of information recording and optical pickup, which is applied in the direction of optical recording head, optical recording carrier, optical recording/reproduction, etc. It can solve the problems of recording layer deviation and achieve the effect of stable reproduction

Inactive Publication Date: 2008-07-16
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in the case of recording information on a multilayer information recording medium having an OTP structure, the technique of Japanese Laid-Open Patent Application No. 2004-164720 has a problem of causing deviation in one of the recording layers of the recording medium

Method used

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  • Optical pickup unit and information recording apparatus using the same
  • Optical pickup unit and information recording apparatus using the same
  • Optical pickup unit and information recording apparatus using the same

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0040] Embodiments of the present invention will now be described with reference to the drawings.

[0041] In the following, for simplicity of description, a dual-layer disc having two recording surfaces is taken as an example of a multi-layer information recording medium. However, the present invention is not limited to dual-layer discs. Also, in the drawings, the same elements as those described above are denoted by the same reference numerals, and descriptions thereof are omitted.

[0042] 7A and 7B are diagrams each showing the arrangement of the main beam 1 and the sub-beams 2a and 2b focused on the recording surface of the multilayer information recording medium (dual layer disc) according to the first embodiment of the present invention. picture. FIG. 7A shows a state in which each of light beams 1, 2a, and 2b is focused on the recording surface (L0 layer, FIG. 5) on the objective lens side. In FIG. 7A, information is recorded on the recording surface in a direction ...

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Abstract

An optical pickup unit for recording information on and / or reproducing information from a multilayer information recording medium including multiple recording surfaces in each of which a guide groove on which the information is to be recorded is spirally formed is disclosed. The optical pickup unit includes a light source, a diffraction element configured to split the light beam emitted from the light source into a main light beam and first and second sub light beams, an objective lens for focusing the main and sub light beams onto a recording surface of the multilayer information recording medium, and multiple light receiving elements each divided into light receiving parts so as to receive the main and sub light beams reflected from the recording surface. The focused first and second sub light beams are disposed at respective positions at least 3 / 2 tracks away from the focused main light beam on the recording surface.

Description

technical field [0001] The present invention generally relates to an optical pickup unit and an information recording device, and more particularly to an optical pickup unit that performs recording to a multilayer information recording medium by using a differential push-pull method and an information recording device using the same. Information is recorded on and reproduced from the surface, and the differential push-pull method is used to detect and control the position of the emitted light beam. Background technique [0002] In an information recording apparatus, a main beam is emitted from a light source onto a recording surface of an information recording medium having a guide groove (information track) on which information is recorded to record information on the information recording medium, or according to the Light reflected from the recording surface reproduces information from the information recording medium. The information recording apparatus includes an optic...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G11B7/095G11B7/24G11B7/135G11B7/09
Inventor 小形哲也见上竜雄
Owner RICOH KK