Unlock instant, AI-driven research and patent intelligence for your innovation.

Optical disc device

A technology for equipment and optical discs, which can be applied to recording/reproducing by optical methods, instruments, systems characterized by carrier structures, etc., can solve the problems of lens error signal quality deterioration, C/N deterioration, etc. Effect

Inactive Publication Date: 2013-05-08
SONY CORP
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In other words, stray light with various angles and various optical path lengths is generated, which leads to further deterioration of C / N
[0013] For configurations that use the HOE for split light reception to generate the focus error signal and the lens error signal, it has been found that the quality degradation of the lens error signal is especially noticeable due to the influence of stray light in multilayer optical discs

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Optical disc device
  • Optical disc device
  • Optical disc device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] 3-3. Embodiment 2

[0072] 4. Modify

[0073] 1. The configuration used as the basis for the embodiment

[0074] 1-1. Optical system configuration

[0075] figure 1 is a diagram for describing the configuration of an optical disc device as a basis for the configuration of an embodiment of the optical disc device. Specifically, figure 1 The internal configuration of an optical pickup included in this optical disc device is mainly shown.

[0076] first, figure 1 An optical disc 100 is shown, which the optical disc device regards as a recording or playback target. Here, the optical disc 100 is referred to as an optical disc recording medium, for example, BD (Blu-ray Disc (registered trademark)), DVD (Digital Versatile Disc), CD (Compact Disc), or the like. Here, the optical disc recording medium refers to a disc-shaped optical recording medium, and the optical recording medium is a general term for recording media that perform signal playback by irradiation of li...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An optical disc device includes: a diffraction element receiving as input reflected light from an optical disc recording medium, including a first diffraction area formed in a position where light in the center portion of incident light flux is diffracted, a second diffraction area formed so as to be in contact with an outer edge of the first diffraction area, and a third diffraction area formed so as to be in contact with an outer edge of the second diffraction area; and a light receiving / signal generating unit which generates a focus error signal and a lens error signal based on light diffracted at the third diffraction area; with the light receiving / signal generating unit receiving light diffracted at the second diffraction area, and generating the focus error signal based on the received light signal thereof and a received light signal obtained by receiving light diffracted at the third diffraction area.

Description

technical field [0001] The present invention relates to an optical disc device that performs recording or playback to an optical disc recording medium. Background technique [0002] For example, as disclosed in Japanese Unexamined Patent Application Publication No. 2010-146607, there is a configuration in which detection of a focus error signal according to a spot size method and detection of a focus error signal according to a tracking servo are performed using a shared detector. The detection of signals (such as lens error signals, etc.). [0003] This configuration uses a HOE (Holographic Optical Element) configured to have a cylindrical lens effect, for example, for a focus position along its tangential direction (direction corresponding to the longitudinal direction of a track formed in an optical disc recording medium), to generate The light whose focus position is closer to the light-receiving surface (hereinafter, also referred to as near-side focus light) and the l...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): G11B7/1353G11B7/1356G11B7/1381
CPCG11B7/1378G11B7/0917G11B7/0901G11B7/1381G11B2007/0013G11B7/0912G11B2007/0006G11B7/1353
Inventor 根本和彦小川悠介石井保
Owner SONY CORP