Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1995-02-13
1996-06-25
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
347235, 347 25, 25022711, G02B 600, B41J 2435
Patent
active
055302424
ABSTRACT:
A fiber optic system is used in a laser ROS scanning system to generate a start of scan signal. In one embodiment, a single optical fiber is positioned at the beginning of a scan line sweep. The fiber transmits a portion of a scan beam energy to a photodetector located on a main electronics system board. The photodiode generates an output signal which is sent as an input to a high speed comparator. A second input to the comparator is a second signal derived from said first signal but having a lower amplitude. The comparator compares two wave forms and generates a sharp electrical transition at the precise time the two wave forms cross which, in preferred embodiment, occurs when the first wave form amplitude level falls to about 1/2 of maximum. The comparator output is used to initiate the SOS signal of a laser diode ROS.
REFERENCES:
patent: 4071754 (1978-01-01), Roulund
patent: 4386272 (1983-05-01), Check, Jr. et al.
patent: 5257048 (1993-10-01), Genovese
patent: 5319393 (1994-06-01), Genovese
patent: 5428808 (1995-06-01), Sawase et al.
patent: 5438354 (1995-08-01), Genovese
Lee John R.
Westin Edward P.
Xerox Corporation
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