Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1991-12-24
1992-12-22
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250237G, G01D 534
Patent
active
051736020
ABSTRACT:
The present invention consists of a photocell array to determine the cross-scan position of a laser beam. The array consists of multiple rows of elongated photocells oriented perpendicular to the main scan direction of the laser beam with each row of photocells representing one bit of data. Furthermore, each row consists of alternating types of photocells, one type representing a logic 1 and the other type representing a logic 0. As the laser beam crosses this array, it energizes certain photocells on each row such that its output is a binary number that identifies the position at which the laser beam crosses the array. To improve the accuracy of the binary output, the pitch between the photocells of each row should not be reduced to less than 1/4 of the width of the laser beam. If greater accuracy is needed, the photocells should be offset while keeping the pitch between the photocells constant at a pitch not less than 1/4 of the width of the laser beam.
REFERENCES:
patent: 4602436 (1986-07-01), Ernst
patent: 4857721 (1989-08-01), Dunavan et al.
patent: 4945231 (1991-07-01), Ohya et al.
patent: 4956553 (1990-09-01), Matsui
patent: 5091643 (1992-02-01), Okutani et al.
Le Que T.
Nelms David C.
Rad Fariba
Xerox Corporation
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