Focusing method for optical media

Details Focusing method for optical media Focusing method for optical media

1997-05-23

1998-09-22

Le, Que

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

2502015, 369 4414, G01J 120

Patent

active

058117890

ABSTRACT:
A method for focusing the objective of an optical pick-up head on the desired information layer of an optical memory device. The focus error signal when the focus servo is in open loop mode is used to determine the location of the information layers (or layer) and to provide a mechanism for providing a signal which can be used to time/trigger the closing of the focus servo, thus providing focus on the desired layer. One example of an embodiment of the invention is an application to a dual layer optical disc.

REFERENCES:
patent: 4750163 (1988-06-01), Yamamiya et al.

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