Optical recording medium, optical recording medium producing apparatus and optical recording medium producing method

Abstract

On DVD-RW (1), groove tracks are meanderingly formed on a groove section on which recording information is recorded, and pit strings where a plurality of phase pits (PI, P1') meanderingly are arranged on the impossible area (UA) and the reproduction exclusive area (RA) which prevent illegal copying. On the respective areas, pit depths (groove depths), duty of the pit strings and wobbling amplitudes are set according to predetermined conditions so that the output levels of the wobble signals extracted based on the wobbling amplitudes can be maintained constant on the respective areas. As a result, synchronous control can be made accurately at the time of recording and reproduction on / from the DVD-RW (1). <IMAGE>

Description

[0001] This application is a divisional application of an invention patent application with an application date of July 25, 2001, an application number of 01123073.8, and an invention title of "optical recording medium, optical recording medium production equipment and production method". technical field [0002] BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an optical recording medium such as a DVD (Digital Video Disc), and more particularly, to an optical recording medium in which recording tracks are formed in a zigzag manner. Background technique [0003] In recent years, DVDs have been widely used as large-capacity optical information recording media. In addition to read-only DVDs (DVD-ROMs), standards are being developed for DVD-RWs (DVD-Recordables) capable of recording and reproducing recorded information. A groove as a recording track is formed in a predetermined pattern on an optical disc in accordance with the DVD-RW standard....

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Problems solved by technology

As a result, even if other reproduction control data are overwritten in this area, the reproduction signal of the overwriting data interferes with the reproduction signal of the embossed pit point string so that it cannot be read out, so basically it is impossible to overwrite other reproduction control data.

[0006] However, since the area where embossed pit point strings are embedded is equal to the area where tracks are intermittently formed, the output level of the wobble signal extracted from this area is lower than that of the wobble signal extracted from the area where continuous tracks of recording data are recorded. output level, so DVD-RW sync detection cannot be performed stably

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