Sensor for detecting beam position and start of scan position

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

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358481, H01J 314

Patent

active

053571061

ABSTRACT:
A sensor for a raster scanner is disclosed which utilizes two elements to detect the position of a scanning light beam relative to a reference level and also detect the start of the scan position. The two elements are placed adjacent to each other in such a manner that on a reference axis, the width of both elements are equal. Each element will have a varying distance between its edges scanned by a spot and such distance on one element will be different than the corresponding distance in the direction of scan on the other element except at the reference axis. Depending on the distances traveled by the light beam on each of the elements, the position of the light beam relative to the reference axis will be detected. The two edges of each element that are adjacent to each other, separating the two elements, must be parallel to each other and orthogonal to the scan direction to also use the crossing of the edges by a light beam as a start of scan detector.

REFERENCES:
patent: 3649840 (1972-03-01), Thorn et al.
patent: 4675517 (1987-06-01), Shiomi
patent: 4950888 (1990-08-01), Hamada
patent: 5081544 (1992-01-01), Kikuchi et al.

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