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Optical disk and optical disk apparatus

A technology for optical discs and equipment, which is applied to optical record carriers, optical recording/reproducing, head configuration/installation, etc., and can solve problems such as lack of instructions

Inactive Publication Date: 2005-03-09
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

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Method used

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  • Optical disk and optical disk apparatus
  • Optical disk and optical disk apparatus
  • Optical disk and optical disk apparatus

Examples

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Embodiment Construction

[0027] Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 shows a cross-section of an optical disc 11 using a pre-formatting system which will be described in detail in this embodiment. An information recording layer 13 comprising, for example, a phase change recording film is formed on the substrate 12 formed of polycarbonate.

[0028] Note that when the optical disc 11 is a reproduction-only optical disc, the information recording layer 13 is formed of a metal reflective film instead of a phase-change recording film.

[0029] Next, a light-transmitting layer (coating layer) 14 having a thickness t is formed on the information recording layer 13 . The coating 14 is a sheet of thickness t formed of, for example, plastic material. The sheet is adhered to the information recording layer 13 formed on the base sheet 12 by an adhesive or an ultraviolet curable resin.

[0030] FIG. 2 shows a form of ...

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Abstract

An optical disk in which tracks in which a header region at which positional information showing a recorded position is recorded and a user region at which user information is recorded are alternately arranged, and in which the user region is made to wobble in a direction perpendicular to the arranging direction are formed, and in which a first region in which at least one of a phase, a frequency, and an amplitude of a wobble is different from the other portions is formed at a portion a given length before the header region in playback order within the user region.

Description

technical field [0001] The present invention relates to an optical disc on which information can be written, and in particular to such an optical disc in which a pre-pit header containing positional information is pre-recorded on the track in which the information is recorded at the predetermined location. [0002] Furthermore, the present invention relates to an optical disc device that reads and plays back recorded information from the above-mentioned optical disc, and particularly relates to an optical disc device that reproduces positional information by estimating the position where a pre-pit header appears. Background technique [0003] As is well known, in recent years, optical discs such as DVD-R (Digital Versatile Disc Recordable) have been widely used as mass storage media that can write information at high density. [0004] In an optical disc, information recording tracks are formed in a spiral or concentric shape around the circumference of the disc. In additio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G11B7/005G11B7/007G11B7/09G11B7/24082
CPCG11B7/00745G11B7/24082
Inventor 渡部一雄黑田和人长井裕士
Owner KK TOSHIBA
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