Optical reading apparatus with scanner light intensity control

Details Optical reading apparatus with scanner light intensity control Optical reading apparatus with scanner light intensity control

1980-08-25

1982-06-08

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369106, 369120, G11B 712

Patent

active

043343015

ABSTRACT:
An optical scanner A for a video recording disc B includes a photo detector 6 for sensing the light from a laser source 1 reflected back from the disc. The low frequency and d.c. components of the photo detector output are compared with a reference voltage to derive an error signal. The latter, after compensation, amplification, and limiting, is applied to a regulator 23 to control the laser source discharge current, and thereby its intensity.

REFERENCES:
patent: 2242638 (1941-05-01), Balsley
patent: 2274530 (1942-02-01), Collins
patent: 2360012 (1944-10-01), Reiskind
patent: 3882317 (1975-05-01), Camerik et al.
patent: 4051329 (1977-04-01), Blondet et al.

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