Optical scanner

Details Optical scanner Optical scanner

1976-11-15

1978-04-11

Griffin, Robert L.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358200, 358206, 358285, 350311, H04N 314

Patent

active

040841880

ABSTRACT:
An optical scanner is disclosed for scanning a three-dimensional object or a two-dimensional document located in a space which is open and exposed to ambient light. Light from a laser is directed through a beam splitter and a deflector to the object or document, from which it is reflected back through the deflector, and from the beam splitter through a narrow-band optical interference filter to a photodetector. The laser light is modulated at a carrier frequency rate, and the electrical signal from the photodetector is demodulated to produce a video signal free of disturbances due to ambient light.

REFERENCES:
patent: 3802775 (1974-04-01), Hughes
patent: 3802775 (1974-04-01), Hughes
patent: 3953667 (1976-04-01), Layton
patent: 3984629 (1976-10-01), Gorog
patent: 3984629 (1976-10-01), Gorog

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