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

1976-11-18

1978-06-06

Cardillo, Jr., Raymond F.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

1791003F, 1791003GN, 1791003N, 1791003V, 358130, H04N 584, G11B 712

Patent

active

040939618

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: 2274530 (1942-02-01), Collins
patent: 4051329 (1977-09-01), Blondet et al.

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