Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1994-03-25
1996-05-07
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
2502081, 358475, 358482, G01J 132
Patent
active
055148646
ABSTRACT:
An apparatus for photo-electric automatic feedback compensation control is used with a charged coupled device (CCD) scanner to efficiently bring the CCD scanner into optimal operating range by controlling the output intensity of a light source based upon output readings from the CCD. A voltage controlled power supply drives a light source to emit light through an optical system to irradiate a CCD scanner. The voltage induced in the CCD scanner is output and manipulated to produce a digital control signal. When the photo-electric conversion rate of the CCD is too high, the light emitting intensity of the light source is reduced based upon the output of the CCD. When the photo-electric conversion rate of the CCD is too low, the output intensity of the light source is increased based upon the output signal of the CCD scanner. Thus, the signal-to-noise (S/N) ratio can be increased without necessity of manual adjustment, and the different problems generated by differences in apparatus characteristics or different environments and timing can be easily overcome.
REFERENCES:
patent: 4677287 (1987-06-01), Ejima
patent: 4728803 (1988-03-01), Catchpole et al.
patent: 4917031 (1990-04-01), Itoh
patent: 5406070 (1995-04-01), Edgar et al.
Chang Shih-Chung
Mu-Tung Wun
Steady Jacqueline M.
Umax Data System Inc.
Westin Edward P.
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