Method of detecting a synchronizing light beam

Details Method of detecting a synchronizing light beam Method of detecting a synchronizing light beam

1977-04-27

1978-10-17

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358208, 358293, 358265, 358130, H04N 584, H04N 506, H04N 508, H04N 574

Patent

active

041212517

ABSTRACT:
In a light beam scanning system for recording or displaying information by use of a scanning light beam modulated by a video signal, a synchronizing signal is obtained by detecting the scanning light beam while the light beam scans lines. The scanning light beam is detected at a predetermined position optically separated from the lines. The light beam focused on a recording material or a cathode ray tube diverges after it passes through the plane of focus. A photodetector for receiving the light beam to obtain a synchronizing signal is located where the diameter of the cross section of the light beam is larger than that of the light beam focused on the recording material or the cathode ray tube. The large diameter is obtained where the light beam diverges or is focused again by use of a focusing lens which is located at a longer distance from the photodetector than from the recording material or the cathode ray tube.

REFERENCES:
patent: 3574469 (1971-04-01), Emerson
patent: 3848087 (1974-11-01), Carrell
patent: 4024341 (1977-05-01), Takahashi
patent: 4028732 (1977-06-01), Salter et al.

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