Knife edge method for use in detecting a focussing error in an o

Details Knife edge method for use in detecting a focussing error in an o Knife edge method for use in detecting a focussing error in an o

1994-11-15

1996-10-22

Ben, Loha

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369120, 369 13, G11B 700

Patent

active

055684629

ABSTRACT:
The inventive knife edge method for use in an optical pick-up system capable of detecting a focussing error is comprised of a light source, an optical detector, a knife edge, an objective lens and a differential amplifier. The system is different from the optical pickup system utilizing a conventional knife edge method in that a beam splitter is absent in the inventive system. By eliminating the loss factor stemming from the presence of a beam splitter from the system, it is possible to increase the optical efficiency of the light beam.

REFERENCES:
patent: 4873678 (1989-10-01), Nakamura et al.
patent: 5231621 (1993-07-01), Matsui et al.
patent: 5317557 (1994-05-01), Goto
patent: 5357499 (1994-10-01), Nomoto
patent: 5383173 (1995-01-01), Kim et al.

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