Focus detecting apparatus utilizing reflecting surface having va

Details Focus detecting apparatus utilizing reflecting surface having va Focus detecting apparatus utilizing reflecting surface having va

1988-04-15

1989-08-29

Richardson, Robert L.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

250201, G11B 700

Patent

active

048624420

ABSTRACT:
A light beam emitted from a source is focused on an object. The beam reflected by the object passes through an optical member and is detected by a photodetector. The optical member has a reflecting surface the reflectivity of which varies continuously with respect to the angle of incidence.

REFERENCES:
patent: 4363961 (1982-12-01), Okada et al.
patent: 4636627 (1987-01-01), Matsumura

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