Optical head for a disc reader

Details Optical head for a disc reader Optical head for a disc reader

1984-03-12

1987-03-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

369 45, G01J 120

Patent

active

046509828

ABSTRACT:
In an optical head, laser beams are converged by an objective lens and projected on a light-receiving surface of an optical disk. The laser beam is reflected by the light-receiving surface, converged by the objective lens into parallel laser beams, and directed to a light shielding plate. Only the laser beam passing through the region spaced from the optical axis is allowed to pass by the light shielding plate, and part of this laser beam is converged by a convergent lens and projected on photo sensitive regions of the photo detecting unit. The objective lens has a convergent point and an inherent maximum defocusing allowance with reference to this convergent point. The photo sensitive regions have a total area larger than that of a circle having a radius Rd.

REFERENCES:
patent: 4503324 (1985-03-01), Yokota
patent: 4521680 (1985-06-01), Ando

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