Optical head apparatus having means to eliminate noise caused by

Details Optical head apparatus having means to eliminate noise caused by Optical head apparatus having means to eliminate noise caused by

1995-11-08

1997-02-04

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369116, 369118, G11B 7135

Patent

active

056006209

ABSTRACT:
An optical head apparatus includes a light source, an optical modulation unit, an objective lens, a reflected beam condensing unit, and a photodetection unit. The light source emits a light beam. The optical modulation unit modulates one of a light intensity and a phase in a section of the light beam from the light source and adjusts a generation position of a side lobe light beam of the light beam. The optical modulation unit has at least a first strip-like light-shielding area inclined by a first predetermined angle with respect to a vertical axis in the section of the light beam. The objective lens focuses the light beam from the optical modulation unit to form a small spot on a recording medium. The reflected beam condensing unit condenses a reflected beam from the small spot on the recording medium. The photodetection unit detects the reflected beam from the reflected beam condensing unit to reproduce information.

REFERENCES:
patent: 5121378 (1992-06-01), Hirose et al.
patent: 5172366 (1992-12-01), Chikuma
patent: 5434840 (1995-07-01), Ezuka et al.
patent: 5450376 (1995-09-01), Matsumura et al.
patent: 5496995 (1996-03-01), Kato et al.
H. Osterberg et al., "The Resolving Power of a Coated Objective", Journal of the Optical Society of America, vol. 39, No. 7, Jul., 1949, pp. 553-557 .

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