Correcting for comatic aberration in an optical head of an optic

Details Correcting for comatic aberration in an optical head of an optic Correcting for comatic aberration in an optical head of an optic

1987-03-24

1989-02-21

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, 369 46, 369105, 369112, 250201, G11B 700

Patent

active

048072125

ABSTRACT:
The present invention relates to an optical head of an optical disk apparatus and a method of making the same, and more particularly, to an optical head which projects a light spot onto a track recess, receives the reflected light of the light spot by at least two photoelectric converters and focuses the light spot based on a differential output from the photoelectric converters. The optical head can accurately focus the light spot even if the reflected light beams that are nonuniform in intensity due to the influence of the comatic aberration of a lens composing the optical head are projected on to the photoelectric converters. This is because the influence of the comatic aberration of the lens is corrected for by marking the direction of central parallel ones of S-like interference fringes on the lens and optically forming a predetermined angle between the marked direction and the direction of the track recess.

REFERENCES:
patent: 4725721 (1988-02-01), Nakamura et al.

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