Optical device

Details Optical device Optical device

1997-08-13

1998-12-01

Swann, Tod R.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4414, 369 4432, G11B 700, H01L 3100

Patent

active

058448772

ABSTRACT:
There is provided an optical device which comprises a light-emitting portion for emitting a laser light, a light-receiving portion for receiving the light emitted from the light-emitting portion, and a converging portion for converging the light emitted from the light-emitting portion to thereby irradiate a portion to be irradiated and for converging a light reflected on and returned from the irradiated portion, wherein the light-receiving portion is located in the vicinity of a confocal point of the converging portion with respect to the light returned from the irradiated portion, the light emitted from the light-emitting portion is received by the light-receiving portion along a path which is coaxial before and after being reflected by the irradiated portion, a push-pull signal is detected by the light-receiving portion, and the push-pull signal is subjected to partial differentiation with the amount of defocus to obtain a coefficient which is used to detect a tracking error signal.

REFERENCES:
patent: 5703863 (1997-12-01), Doi

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