Optical head using a reflection grating

Details Optical head using a reflection grating Optical head using a reflection grating

1988-11-30

1991-07-30

McElheny, Jr., Donald

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With servo positioning of transducer assembly over track...

Optical servo system

G11B 700

Patent

active

050365045

ABSTRACT:
An optical head includes a reflection type grating lens for dividing specified polarized lights into a reflected light and a diffracted light, a device for detecting a RF signal from the reflected light of the grating lens, and a device for detecting focusing and tracking error signals from the diffracted light of the grating lens. The grating lens consists of a plurality of domains having different optical properties respectively, so that the reflected and diffracted lights are obtained. The optical head further includes a total reflection prism to compensate a phase difference between polarized lights orthogonal to a grating groove of the grating lens and parallel thereto, and a polarizing prism for dividing the reflected light into two polarized lights orthogonal to each other in polarization thereof. Thus, a simple, miniaturized, and inexpensive optical head is obtained.

REFERENCES:
patent: 4665310 (1987-05-01), Heemskerk
patent: 4731772 (1988-03-01), Lee
patent: 4733065 (1988-03-01), Hoshi et al.
patent: 4753513 (1988-06-01), Shikama
patent: 4768183 (1988-08-01), Ohnishi et al.
patent: 4885734 (1989-12-01), Yuzo
patent: 4945529 (1990-07-01), Ono et al.

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