Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1992-05-13
1993-08-10
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
250214B, 358237, G01J 4014
Patent
active
052351734
ABSTRACT:
A method of positioning a light beam on a picture surface relative to a light sensor located on the picture surface includes the step of completely illuminating the sensor with the light beam while the sensor is exposed to ambient light and recording a first output signal. A second output signal is recorded when the sensor is exposed to only ambient light. The first and second output signals are provided to an evaluation circuit to calculate a positioning signal having a value equal to a selected percentage of the difference between the first and second output signals. The light beam is positioned relative to the sensor to expose the sensor to a percentage of the light beam which is equal to the selected percentage of the difference between the first and second signals
REFERENCES:
patent: 4085425 (1978-04-01), Hemill
patent: 4593308 (1986-06-01), Kemplin
patent: 4629877 (1986-11-01), Sato et al.
patent: 4851689 (1989-07-01), Hasegawa
Patent Abstracts of Japan 62-104295 May 14, 1987.
Patent Abstracts of Japan 62-334551.
Chauvin Jacques
Gleim Gunter
Deutsche Thomson-Brandt GmbH
Laks Joseph J.
Nelms David C.
Shami K.
Sragow Daniel E.
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