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

CD equipment

A kind of technology of equipment and optical disk, which is applied in the direction of optical recording head, optical recording carrier, light beam guiding device, etc., and can solve the problem of long starting time and so on

Inactive Publication Date: 2005-05-25
PANASONIC CORP
View PDF1 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, such a conventional device has an undesirably long start-up time

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
  • CD equipment
  • CD equipment
  • CD equipment

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0037] figure 1 is a block diagram of an optical disc apparatus 100 for reproducing / recording data from / to a recordable optical disc according to Example 1 of the present invention.

[0038] see figure 1 , the optical disc device 100 includes an optical head 11 . This optical head 11 comprises a semiconductor laser light source 10, is used for illuminating an optical disk 12 with a light beam 19; A coupling lens 15, is used for collimating the light output from the semiconductor laser light source 10; A converging lens 16; An actuator 17; 4 equally split photodetectors 14 and a polarizing beam splitter 18 .

[0039] The light beam output from the semiconductor laser light source 10 is collimated by the coupling lens 15 . Then, the collimated beam passes through a polarizing beam splitter 18 and is converged by a converging lens 16 which is moved in a focusing direction and a tracking direction by an actuator 17 . Thus, the light beam 19 forms a beam spot on the disc 12 .

...

example 2

[0076] Example 2 of the present invention will be described with reference to FIGS. 5 to 8B.

[0077] FIG. 5 is a block diagram showing an optical disc apparatus 200 according to Example 2 of the present invention. Focus control and tracking control are basically the same as those described in Example 1, so no further description will be given.

[0078] Image 6 The relationship among address segment arrangement, tracking error signal TE, address segment RF signal and address polarity determination signal is shown.

[0079]Referring to FIG. 5, the focus error signal FE and the tracking error signal TE are input to a control state determination circuit 900 for determining the current state of focus control and tracking control.

[0080] The control state determination circuit 900 detects an out-of-focus state when it determines that the focus error signal FE is equal to or greater than a predetermined value. Also, the control state determination circuit 900 detects an unstab...

example 3

[0120] The following will refer to Figure 9 with 10 Example 3 of the present invention is described.

[0121] Focus control and tracking control are basically the same as described in Example 1, and no longer Figure 9 Components having the same reference numerals as above are described.

[0122] Using the tracking error signal TE, the maximum value measurement circuit 901, the minimum value measurement circuit 903, the average value measurement circuit 902 and the amplitude absolute value conversion circuit 904 generate the address segment detection signal which is basically the same as that described in the above-mentioned example 2, so it will not be performed any further. describe.

[0123] Such as Figure 9 As shown, the focus error signal FE and the tracking error signal TE are input to a control state determination circuit 900 for determining the current state of focus control and tracking control.

[0124] The output of the address segment detection circuit 906 i...

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 disk device comprising a light amount detecting section for irradiating an information carrier with a light beam so as to detect information recorded in a data segment of the information carrier; an address segment detecting section for A signal for detecting that the light beam is on the address segment; a pulse counter section for counting the number of signals output from the address segment detection section within a predetermined time period; a radial position estimation section for counting the number of signals output from the address segment detection section according to the pulse The output of the counter part estimates a radial position of the light beam with respect to the information carrier; and a clock setting part is used for actuating the radial position estimation part and according to the radial position by the radial position when the address information cannot be reproduced. The radial position of the beam estimated by the position estimating section sets a reproduction clock.

Description

[0001] This application is a divisional application of the Chinese patent application with the application number 99122184.2 and the title "Optical Disk Device" filed on November 1, 1999. technical field [0002] The invention relates to an optical disc device for optically reproducing / recording a signal from / to an information carrier using light beams from a light source, such as a semiconductor laser. More specifically, the present invention relates to an optical disc apparatus for reproducing / recording a signal from / to a recordable disc having address segments wobbled with respect to a track. Background technique [0003] Information carriers (optical discs) such as CD-AUDIO, CD-ROM, DVD-VIDEO and DVD-ROM contain information recorded thereon as several concave / convex pits arranged along a single spiral track, wherein the single spiral The tracks run helically from the inner periphery to the outer periphery of the disk. [0004] In order to correctly reproduce a signal on...

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): G11B7/135G11B7/005G11B7/007G11B7/09
CPCG11B7/005G11B7/00718G11B7/00745G11B7/0901G11B7/004G11B7/007
Inventor 紫原哲也渡边克也木村直浩高桥秀実
Owner PANASONIC CORP
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com