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Optical disc and its information recording method and apparatus

a technology of information recording and optical disc, applied in the field of optical disc and its information recording method and apparatus, can solve the problems of physical restriction of user data in parts, deformation of preformat information, and lowering detection level, and achieve good high-density recording

Inactive Publication Date: 2008-06-19
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0015](A) Therefore, in embodiments of the present invention, an optical disc and its information recording method and apparatus are provided which are capable of performing good high-density recording without causing the problems described above.
[0016](B) Furthermore, an object in the embodiments of this invention is to provide an optical disc and its information recording method and apparatus capable of maintaining stable detection of preformat information.

Problems solved by technology

In other words, when the method in which the prepits are recorded is adopted, recording of the user data is physically restricted in parts where the prepits are formed.
In such a case, if the position of the preformat information and the recording start position of the user data exit in the same area, such problems occur as that the preformat information is deformed and a detection level is lowered.

Method used

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  • Optical disc and its information recording method and apparatus
  • Optical disc and its information recording method and apparatus
  • Optical disc and its information recording method and apparatus

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Embodiment Construction

[0044]Embodiments of this invention will hereinafter be described with reference to the drawings.

[0045]Before explaining specific examples of the present invention, prerequisite techniques will first be described. In FIG. 1, an optical disc 1 usually has a spirally formed recording track 2. The recording track 2 is divided into Physical segments 3 having a predetermined length, and an address is assigned to each Physical segment 3. This address is written as preformat data into each Physical segment 3.

[0046]In an optical disc adopting a CLV method in which record circuit density is constant, all the Physical segments have the same length. If the length of the Physical segments is too long, time to find address information by random access increases, and therefore, the length is selected so that the number of Physical segments 3 will be ten to several tens in one round.

[0047]In a preformat method, a prepit is formed at the front of the Physical segment 3. However, portions for the pr...

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Abstract

Recording timing of a Data segment is set so as to avoid locating a wobble modulated portion as preformat information which indicates information on Physical segments of a recording type optical disc, and a recording start head position of the Data segment to be recorded in a track, in the same area of the track.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a divisional of co-pending U.S. application Ser. No. 10 / 795,396, filed Mar. 9, 2004, and for which priority is claimed under 35 U.S.C. §121. This application is based upon and claims the benefit of priority under 35 U.S.C. § 119 from the prior Japanese Patent Applications No. 2003-070620, filed Mar. 14, 2003; and No. 2004-028216, filed Feb. 4, 2004, the entire contents of all applications are incorporated herein by reference in their entireties.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to an optical disc and its information recording method and apparatus.[0004]2. Description of the Related Art[0005]In a recording type optical disc, preformat information is recorded in advance on the optical disc. When an information recording apparatus for optical discs records data on the optical disc, it detects the preformat information, refers to this detected information, and decides a ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G11B7/24G11B7/0045G11B7/007G11B7/24082G11B20/10G11B20/12G11B20/14G11B27/19G11B27/24
CPCG11B7/00718G11B2220/2537G11B7/24082G11B20/1217G11B20/1403G11B27/19G11B27/24G11B2020/1222G11B2020/1229G11B2020/1231G11B2020/1232G11B2020/1239G11B2020/1265G11B2020/1277G11B2020/1287G11B2220/216G11B2220/218G11B7/0079G11B7/007
Inventor MARUYAMA, SUMITAKANODA, CHOSAKU
Owner KK TOSHIBA
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