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

Optical-disc drive apparatus and method of deciding optimum recording powers of laser beam

A recording power, optical disc device technology, applied in optical recording/reproducing/erasing methods, recording of information on magnetic discs, optical recording systems, etc., can solve problems such as the influence of recording power, and achieve the effect of shortening the required time

Active Publication Date: 2008-04-02
RAKUTEN GRP INC
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, an optical disc with a multilayer structure has different characteristics before information recording compared to an optical disc with a single layer structure, and the recording state of each layer affects the recording power of other layers. For the method of optimum recording power, it is necessary to use a method different from the method for obtaining the optimum recording power value for conventional single-layer 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 drive apparatus and method of deciding optimum recording powers of laser beam
  • Optical-disc drive apparatus and method of deciding optimum recording powers of laser beam
  • Optical-disc drive apparatus and method of deciding optimum recording powers of laser beam

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0038] FIG. 1 shows a block diagram of an embodiment of an optical disc device according to the present invention. This optical disc device has an optical head 2, a laser drive circuit 3, a servo circuit 4, an OPC recording processing section 5, an encoding circuit 6, a playback signal processing section 7, an OPC playback processing section 8, and a system control circuit 9 for performing the following processing : According to the control of each block involved in the system control circuit 9 realized by a microcomputer, record information with an optimum recording power value to, for example, a write-once or rewritable optical disc 1 with a single-sided 2-layer structure, and reproduce it on the optical disc 1 on the information recorded.

[0039] That is, the optical disk device shown in FIG. 1 irradiates a laser beam from the optical head 2 to the optical disk 1, and the reflected light reflected from the optical disk 1 is received by the optical head 2, and a signal is o...

no. 2 Embodiment approach

[0066] In the above-mentioned first embodiment, as shown in FIG. 3 and FIG. 4 , the OPC of the optical disc 1 provided with the BCA area 12c for CPRM support has been described. However, in the second embodiment, an optical disc not compatible with CPRM is used. Therefore, there is no need to set the BCA area 12c. The second embodiment uses the area used as the BCA area 12c as the OPC area of ​​the second layer and later, thereby further increasing the number of OPCs. In addition, the configuration of the optical disc device and the procedure of the recording process are the same as those of the first embodiment shown in FIGS.

[0067] 8( a ) and ( b ) are explanatory diagrams showing an example of the arrangement of the OPC area of ​​the optical disc 1 in which the recording layer has a single-sided two-layer structure in this embodiment. As shown in FIGS. 8( a ) and ( b ), the optical disc 1 of the second embodiment is not compatible with CPRM, and there is no need to provid...

no. 3 Embodiment approach

[0084]In the second embodiment described above, in the CPRM non-compatible optical disc 1, the outer peripheral side of the RMA area not used as the BCA area is used as the OPC area T2 of the second layer 21, and the second layer 21 is not used as the OPC area T2. In the case where the inner peripheral side of the RMA area is used as the OPC area, in the third embodiment, the inner peripheral side and the outer peripheral side of the RMA area of ​​the first layer 20 are used as the OPC area T1 of the first layer 21, The inner peripheral side and the outer peripheral side of the RMA area of ​​the second layer 21 are used as the OPC area T2 of the second layer 21 . In addition, the configuration of the optical disc device of the third embodiment and the procedure of recording processing thereof are the same as those of the first and second embodiments shown in FIGS. 1 and 5 . execution is explained.

[0085] 10( a ) and ( b ) are explanatory views showing an example of the arra...

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

In cases where forthcoming recording of information on a multi-layer optical disc is first time one, test signals are recorded on trial write areas in first and second recording layers before being reproduced. First-time optimum recording powers of the laser beam for the respective first and second recording layers are decided in response to the reproduced test signals. In cases where forthcoming recording is not first time one, the test signals are recorded on only the trial write area in the first recording layer before being reproduced. A new optimum recording power for the first recording layer is decided in response to the reproduced test signals. Thereafter, a new optimum recording power for the second recording layer is calculated from the new optimum recording power for the first recording layer and the ratio between the first-time optimum recording powers for the first and second recording layers.

Description

technical field [0001] The present invention relates to an optical disc device and a method for determining the optimum recording power value of an optical disc, and particularly relates to obtaining the optimum recording power value for the data areas of each layer when recording information on an optical disc with a multi-layer structure by a laser, so as to An optical disc apparatus for recording information at the optimum recording power value, and an optical disc optimum recording power value determination method for obtaining the optimum recording laser power when recording information on the above-mentioned optical disc having a multilayer structure. technical background [0002] Now, in the field of optical discs, various optical discs that can record information are increasing, and various digital versatile discs (DVD: Digital Versatile Disk) are being sold (for example, post-write optical discs such as DVD-R and DVD-RW, DVD- rewritable discs such as RAM, etc.). Th...

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): G11B7/0045G11B19/12
Inventor 江口秀治寺西康彦
Owner RAKUTEN GRP INC
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