Optical information recording medium and its manufacturing method

Abstract

The technical subject of the present invention is to provide an optical information recording medium and method for producing the same with excellent recording / reproduction characteristics and tracking characteristics, and signal pits in the groove. In addition, the present invention provides a substrate pressing mold and the production method to produce the said optical information recording medium. In the optical information recording medium of the present invention, since signal pits are allocated on the groove with flat bottom surface, the height difference between the position of the interface between the groove portion of the recording layer containing organic pigment and the reflective layer, and the position at the interface between the recording layer and the reflective layer in the signal pits portion of the groove, is larger compared to that of the optical information recording medium having wide width portion and narrow width portion in the groove. The information of the signal pits in the groove can be recorded with high degree of modulation and low wobble.

Description

technical field [0001] The present invention relates to an optical information recording medium and a manufacturing method thereof, as well as a stamper for manufacturing a substrate of an optical information recording medium and a manufacturing method thereof; in particular, it relates to the use of prefabricated information pits (prepits and prepits) for manufacturers and countermeasures for copyright protection. An optical information recording medium in which media information such as information is recorded in an optical track (group, group) and its manufacturing method, and a stamper for manufacturing a substrate and its manufacturing method. Background technique [0002] In recent years, DVD (Digital Versatile Disc) having a recording capacity several times larger than that of CD (Compact Disk) has been widely used as a recording medium for information such as images and audio. Moreover, for DVD, there are DVD-R digital high-definition video recordings (supplementary ...

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Problems solved by technology

[0010] However, in the above-mentioned optical information recording medium, although there are actually some differences in the height position of the interface between the recording layer and the reflective layer in the wide portion of the track and the narrow portion of the track, it is not possible to obtain sufficient space for reproducing information. The laser optical path difference required by the signal modulation degree

A sufficient optical path difference cannot be obtained even with various changes in the size ratio of the wide portion to the narrow portion of the track, the viscosity of the recording layer material, and the substrate rotation driving conditions.

Moreover, in the case of an optical information recording medium using the wide and narrow portions of the track to record information such as medium information, it is difficult to narrow the track information pit (トラツクピツチ, track pit). It is disadvantageous to increase the recording capacity of the optical information recording medium by narrowing the track information pit

[0011] In JP-A-8-129780 and JP-A-2002-237093, it is disclosed that the film thickness of the recording layer (dye layer) formed on the substrate is different by utilizing the depth of information pits and tracks formed on the surface of the substrate. Optical information recording media, but none of the literature talks about optical information recording media with inner track information pits

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