| 摘要 |
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.
|
