Optical pickup for reading optical disk information provided wit

Details Optical pickup for reading optical disk information provided wit Optical pickup for reading optical disk information provided wit

1988-02-02

1989-09-19

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120, G04B 4500

Patent

active

048683779

ABSTRACT:
According to an optical system of an optical pickup of the present invention, beam is split into two portions by a light refracting member which is disposed between a condenser lens and a light receiving element, a portion of beam entering into the light refracting member is utilized for detecting tracking errors, and the remaining portion of beam which is not permitted to enter into the light refracting member is utilized for detecting focussing errors by a knife edge test. With the above-mentioned constitution of the optical system, a tracking error composition is prevented from interferring with the focussing error detection and, at the same time, both the tracking errors and focussing errors can be detected by one light receiving element. Thus, the number of component parts can be reduced and the optical system itself can be made compact.

REFERENCES:
patent: 4135207 (1979-01-01), Greve et al.
patent: 4143402 (1979-03-01), Bricot et al.
patent: 4345321 (1982-08-01), Arquie et al.
patent: 4485303 (1984-11-01), Suzuki

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