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

Optical disc recording apparatus and method for determining optimum write power thereof

An optical disc recording and optical disc technology, applied in the direction of optical recording head, light beam source, etc., can solve the problems of complicated OPC process and not suitable for optical discs, and achieve the effect of reducing the influence of uneven writing sensitivity and reducing the fluctuation of writing sensitivity Influence, effect to prevent decrease of accuracy

Inactive Publication Date: 2010-09-08
SONY CORP
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of these methods is that the process of OPC as a whole tends to be complicated by repeating a series of operations including characteristic measurement and writing
Another problem is that the method of including previous writing in an area where trial writing is performed as preprocessing is not suitable for non-rewritable optical discs such as CD-R (CD-Recordable)

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 recording apparatus and method for determining optimum write power thereof
  • Optical disc recording apparatus and method for determining optimum write power thereof
  • Optical disc recording apparatus and method for determining optimum write power thereof

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0108] FIG. 3 is a block diagram showing the configuration of an optical disc recording apparatus according to an embodiment of the present invention. In the drawings, reference numeral 1 is an optical disk. The spindle motor 2 rotates the optical disc 1 . The optical pickup 3 includes, for example, an optical element portion such as a semiconductor laser, a drive circuit for driving the semiconductor laser, a lens, an actuator, and the like. The slide motor 4 moves the optical pickup 3 tangentially to the optical disc 1 . The reproduction unit 7 reproduces the data, position information and synchronization timing recorded on the optical disc 1 from the signal obtained by the optical pickup 3 . Servo section 5 controls spindle motor 2 , slide motor 4 , and actuators of optical pickup 3 in accordance with information on various errors monitored by optical pickup 3 , synchronization timing obtained from reproduction section 7 , and the like. In a desired state, the servo sect...

no. 2 example

[0151] As mentioned earlier, there are various write sensitivity fluctuation factors. When some factors related to periodic fluctuations, such as the relative inclination of the light spot, the misalignment with the recording track (hereinafter, such misalignment is called off-track), and the focus misalignment (hereinafter, such misalignment is called off-track) When such a partial factor of focal length) is reduced, the accuracy in OPC can be improved. Error information of these factors can be obtained from the servo section 5 .

[0152] FIG. 8 is a flow chart showing the procedure of a method for determining an optimum write power using information on write sensitivity fluctuations obtained from the servo section 5 according to a second embodiment of the present invention.

[0153] (Step S1201 ) The control section 10 measures write sensitivity fluctuations including factors such as tilt, off-track, and defocus by obtaining error information of each factor from the servo s...

no. 3 example

[0156] In the process of manufacturing the optical disc 1, it is generally known that fluctuations in write sensitivity are caused by fluctuations in the characteristics of the recording film of the optical disc 1, and the characteristics of the reflective film or the cover film. Generally, in a recordable optical disc 1, for the purpose of indicating a physical position (hereinafter, such a position is referred to as an address), the groove structure is subjected to wobble modulation, or pits are provided. These processes are performed to embed address information into the optical disc 1, and a method in which information on the write sensitivity fluctuation period of the optical disc 1 is embedded into these pits, for example here, is also advantageous.

[0157] FIG. 9 is a flow chart showing the process of the method for determining the optimal write power according to the third embodiment of the present invention. This method uses information embedded in the optical disc 1...

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

A method for determining optimum write power for an optical disc in an optical disc recording apparatus includes, test writing the optical disc as a recording medium at a first position where a write sensitivity is higher than an average write sensitivity of the optical disc and at a second position where the write sensitivity is lower than the average write sensitivity by the same amount of difference as the difference between the write sensitivity at the first position and the average write sensitivity, using the same write power to the both of the first position and the second position, and obtaining an optimum write power for the optical disc from an average of a write characteristics of the test written positions.

Description

technical field [0001] The present invention relates to an optical disc recording apparatus that performs writing on an optical disc by using laser light. More particularly, the present invention relates to an optical disc recording apparatus in which optimum writing power is set for performing writing on an optical disc, and a method for determining the optimum writing power in the optical disc recording apparatus. Background technique [0002] In the method of determining and controlling the optimal writing power in optical disc recording (hereinafter, the optimal writing power is abbreviated as Po, and the optimal power control is abbreviated as OPC), usually Po is calculated by arithmetically processing the writing characteristics, Such as the fluctuation of the reflection coefficient when writing, the asymmetry after writing, the amplitude, the depth of modulation, and by testing several points selected near the writing power suitable for obtaining Po (hereinafter, abbr...

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 Patents(China)
IPC IPC(8): G11B7/125
Inventor 児玉英隆
Owner SONY 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