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

Optical read device, information processing device and information reproduction method

An information processing device and optical reading technology, applied in optical recording/reproduction/erasing methods, optical recording/reproduction, information storage, etc., can solve the problem of eliminating common mode components, signal imbalance, and difficult to obtain Issues such as address information to achieve the effect of eliminating common mode components

Inactive Publication Date: 2005-03-09
SONY GRP CORP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, when the light spot is at a position moving from the center of the dichotomous detector to either side, for example, when the light spot S is located toward area B (such as Figure 12A shown) or to area A (such as Figure 12C shown) skewed position, the common-mode component cannot be satisfactorily canceled
[0011] If a positional deviation of the spot on the dichotomous detector occurs due to movement in the objective, e.g. deflection, the signals of the various light quantities become unbalanced, thus preventing satisfactory removal of the RF component from these signals
The unfortunate result is that it is difficult to obtain the recorded address information, or the structure of the detection circuit is complicated

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 read device, information processing device and information reproduction method
  • Optical read device, information processing device and information reproduction method
  • Optical read device, information processing device and information reproduction method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] The present invention relates to an optical reading unit that irradiates light on an optical recording medium, an information processing device using the optical recording medium (for example, a recording / reproducing device), and an information reproducing method. The present invention assumes detection of light returned from an optical recording medium to obtain a push-pull signal, and the present invention is preferably applicable to, for example, an optical recording medium having address information recorded as wobble information, and reproducing said address information contained in a push-pull signal .

[0028] figure 1 The basic structure of the present invention is shown, which illustrates a typical structure of an optical disk recording / reproducing apparatus.

[0029] Various types of information including user data are recorded on the optical recording medium 2 used in the information processing apparatus 1, and such information is read out by irradiation wi...

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

The invention discloses an optical reading unit in which ligh irradiates on an optical recording medium, an information processing device using the optical recording medium (e.g. a recording / reproducing device), and an information reproducing method. The optical reading unit ensures that address information recorded as guide groove wobbles on an optical recording medium is easily played back. A light-receiving device (20) for detecting returning light from the optical recording medium has detection areas (21A to D) delimited by a plurality of split lines (22), (23), and (24). The position of one of the split lines functioning as a detection reference line is changed according to the position of a returning light spot S on a light-receiving surface (21) of the light-receiving device (20) and push-pull signals (PP1 to 3) are acquired by calculating the difference between signals received on two detection areas delimited by the split line to eliminate common-mode components.

Description

technical field [0001] The present invention relates to a method for satisfactorily canceling a common mode component when generating a push-pull signal in an apparatus using an optical recording medium, and by using a light splitter having a light receiving surface divided by a plurality of split lines (split lines) A technique in which the receiving device selects a division line based on the position of the light spot on the light receiving surface to detect the address information contained in the push-pull signal, thereby overcoming the problems that exist when using the push-pull method (that is, when returning to the center of the light spot The problem of DC offset that occurs when the center of the light-splitting receiver does not coincide). Background technique [0002] Recording / reproducing apparatuses using optical recording media such as compact discs (CDs) and digital versatile discs (DVDs) are widely known. Information writable optical discs such as CD-R / RW,...

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
Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/005G11B7/09G11B7/13G11B7/133
CPCG11B7/0053G11B7/133G11B7/0903G11B7/094G11B7/005G11B7/09
Inventor 饭村绅一郎
Owner SONY GRP CORP