Autofocusing control system

Details Autofocusing control system Autofocusing control system

1985-08-16

1988-02-16

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

354406, 369106, 369 45, G11B 709

Patent

active

047257210

ABSTRACT:
An autofocusing control system makes a position of focusing spot follow for itself a displacement of an information medium. In the autofocusing control system, a single mode semiconductor laser is excited in a multi oscillation mode by returning part of a reflected light beam from the information medium, and a focusing lens having chromatic aberration is used which focuses a laser beam from the semiconductor laser onto a different position along the optical axis of the lens in association with a different laser wavelength.

REFERENCES:
patent: 4243848 (1981-01-01), Utsumi
patent: 4365323 (1982-12-01), Heemskerk et al.
patent: 4368526 (1983-01-01), Harigae et al.
patent: 4450547 (1984-05-01), Nakamura et al.
patent: 4532619 (1985-07-01), Sugiyama et al.
patent: 4600831 (1986-07-01), Hutley

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