System and method of astigmatism correction in an optical head a

Details System and method of astigmatism correction in an optical head a System and method of astigmatism correction in an optical head a

1986-11-24

1988-12-06

McElheny, Jr., Donald

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369122, G11B 7125

Patent

active

047899786

ABSTRACT:
An optical head apparatus comprises a laser light source device emitting linearly polarized light, a converging lens for converging the light pencil emitted from the laser light source onto information recording tracks on a recording medium, and an optical system including a beam splitter for separating the light pencil reflected from the recording medium from the light pencil emitted from the laser light source. The converging lens is one formed by molding. The rotary position of the converging lens about the optical axis of the converging lens is so adjusted that the astigmatism of the optical system from the laser light source to the recording medium is minimum.

REFERENCES:
patent: 4585296 (1986-04-01), Minoura et al.
patent: 4592627 (1986-06-01), Smid
patent: 4612437 (1986-09-01), Ohsato
patent: 4645311 (1987-02-01), Rothe
patent: 4678288 (1987-07-01), Lonsdale et al.
Tatsuno, K. and Arimoto, A., Applied Optics, vol. 20, No. 20/15 Oct. 1981.
SPIE International Symposium on Optical and Optoelectronic Applied Sciences, Jun. 1986, paper.
Harada, Journal of the Television Engineers of Japan, 38:807-814 (1984) "Present Status of Plastic Lens".

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