Optical disc apparatus

Details Optical disc apparatus Optical disc apparatus

2005-11-15

2005-11-15

Hindi, Nabil (Department: 2655)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S053370

Reexamination Certificate

active

06965549

ABSTRACT:
In an optical disc apparatus1, when a supply of operation power to the main unit is started, an objective lens4ais moved to a focusing position (a position where the focus is placed on a reflective recording layer of an optical disc10) which is determined in the design level. If the quantity of reflected light at this time is equal to or larger than a threshold SH, it is judged that the optical disc10is set in the main unit. Therefore, a time period required for detecting whether the optical disc10is set in the main unit or not can be shortened.

REFERENCES:
patent: 5115419 (1992-05-01), Akiyama et al.
patent: 5473589 (1995-12-01), Horie
patent: 5587982 (1996-12-01), Choi
patent: 4-93917 (1992-08-01), None
patent: 8-14929 (1996-02-01), None
patent: 2000-195066 (2000-07-01), None

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