Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1980-08-15
1982-06-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250557, 356401, G01N 2186
Patent
active
043373984
ABSTRACT:
In a light beam scanning type recording system in which a part of a read-out light beam scans a form slide and another part of the read-out light beam scans a linear encoder to generate photoelectric pulses, a data signal is read out by use of a video clock signal, and a recording light beam is modulated by a video signal obtained by combination of the data signal and the form signal, a device for correcting displacement of the form slide from a predetermined position with respect to the data information is provided. An optical mark is provided on the form slide in the marginal area thereof and a mark signal is generated when the read-out light beam passes through the optical mark. The number of clock pulses from a pulse generator is counted after the mark signal is generated and before the first photoelectric pulse is outputed to detect the amount of displacement of the form slide. Then, the video clock signal or the form signal is delayed according to the detected amount of displacement.
REFERENCES:
patent: 4167677 (1979-09-01), Suzki
Kimura Tsutomu
Ohnishi Masahiro
Fuji Photo Film Co. , Ltd.
Hostetter Darwin R.
Nelms David C.
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