Focus optical system and optical disc master exposure apparatus

Details Focus optical system and optical disc master exposure apparatus Focus optical system and optical disc master exposure apparatus

2011-04-26

2011-04-26

Giesy, Adam R (Department: 2627)

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

C369S112240, C369S094000

Reexamination Certificate

active

07933189

ABSTRACT:
In a focus optical system for optical discs or optical disc master exposure apparatuses, a relative positional relation between a cylindrical lens and a 4-division detector in an astigmatic optical system is adjust so that an interference fringe appearing in reflected light derived from an optical disc master is made to be incident on a dead zone of the 4-division detector. Thus, an astigmatic focus servo free from effects of variations in a focus error signal due to the interference fringe is realized. As a result of this, effects of the interference fringe appearing in the reflected light derived from an optical disc or optical disc master can be suppressed.

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