Optical recording medium and master disc for manufacturing...

Details Optical recording medium and master disc for manufacturing... Optical recording medium and master disc for manufacturing...

2005-09-06

2008-10-21

Gupta, Yogendra (Department: 1791)

Plastic article or earthenware shaping or treating: apparatus

Means applying electrical or wave energy directly to work

Radiated energy

C264S001360, C369S044130, C369S044370, C369S100000

Reexamination Certificate

active

07438547

ABSTRACT:
An optical recording medium allowing high-density recording, where a groove having a shallow U-shaped cross section wider than certain width, a master for manufacturing optical recording medium, a manufacturing apparatus thereof, and a manufacturing method thereof are provided. A exposure beam (61) and a exposure beam (62) are recombined together with a first exposure beam (60) in a second PBS (47) so that traveling directions thereof may be the same direction. At this time, the exposure beam (61) and the exposure beam (62) are arranged so that both optical axes may be aligned at certain distance. Thereby, a width of a spot formed by combining these beams can be extended, and light exposure of the spot can be proper to form a shallow groove, as typically showed in FIG.3.

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U.S. Appl. No. 11/218,482, filed Sep. 6, 2005, Endoh et al.
U.S. Appl. No. 11/218,481, filed Sep. 6, 2005, Endoh et al.

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