Method for exposing optical master disk

Details Method for exposing optical master disk Method for exposing optical master disk

1996-06-13

1999-03-16

Vargot, Mathieu D.

Plastic and nonmetallic article shaping or treating: processes

Optical article shaping or treating

Light polarizing article or holographic article

264 137, 264400, 264482, B29D 1100, B29D 1700

Patent

active

058825541

ABSTRACT:
An apparatus for exposing an optical master disk includes an exposure section, an exposure control section, a guide groove exposure voltage supplier and a modulator. The exposure section is for exposing a guide groove and pre-pits by different laser beams, and the exposure control section is for controlling an exposure voltage of the laser beams in the exposure section and an exposure timing. The guide groove exposure voltage supplier is for supplying, in accordance with the pre-pit designation signal, to the exposure section a guide groove exposure voltage of a first power level when an inside or an outside guide groove adjacent to the pre-pits is exposed and a guide groove exposure voltage of a second power level when a guide groove not adjacent to the pre-pits is exposed. The modulator modulates a laser beam for exposing the guide groove in accordance with the guide groove exposure voltage. In this way, the groove shape of the guide groove adjacent to the pre-pits and that of the guide groove not adjacent to the pre-pits are made uniform.

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