Optical information processing unit

Details Optical information processing unit Optical information processing unit

1996-02-13

1999-08-31

Nguyen, Thong

Optical: systems and elements

Diffraction

From grating

359566, 359 19, 369103, 369109, 369 4414, 369 4411, G02B 518, G02B 532, G11B 700

Patent

active

059461373

ABSTRACT:
In the system of an optical head which conducts recording, reproducing and erasing, etc. on an optical disk by an optical means, the light from an optical disk is guided to photosensors through a diffraction element comprising of two kinds of diffraction gratings, viz. a first and a second diffraction gratings, each made of a partial area of respective zone plates, disposed approximately rectangular to each other; and then, the SSD method focusing error signal is provided from a diffracted light comming from one of the diffraction gratings, while the Far-Field method tracking error signal from the other diffracted light comming from the remaining diffraction grating; thereby a compact high-performance optical head is implemented at low cost.

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patent: 5113386 (1992-05-01), Whitehead et al.
patent: 5442480 (1995-08-01), Swanson et al.
patent: 5502707 (1996-03-01), Komma et al.

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