Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1989-05-09
1991-02-19
Westin, Edward P.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250561, 356387, G01B 1102
Patent
active
049946773
ABSTRACT:
A method of positioning an object relative to a plane, and apparatus therefor. According to the method, the plane is swept by the axis of a light-beam between a source assembly and a detection assembly, and the object is translated approximately perpendicularly to the plane, the detection assembly emitting a signal representative of the light received and therefore, the position of the object relative to the plane. The signal emitted by the detection assembly is measured as a function of time, the translation of the object being halted when the signal has a particular form. The particular form of the signal corresponds to the position of the object in which the shoulder masks a predetermined fixed part of the light-beam during part of its sweep. The apparatus comprises the source assembly for producing the light-beam, a deflecting member for angularly deflecting the light-beam, a first optical system for causing the deflected light-beam to sweep a plane parallel to the light-beam, the detection assembly, a second optical system for focusing the deflected light-beam onto the detection assembly. An electronic processor processes the signal emitted by the detection assembly as a function of time. The deflecting member is placed at the focus of the first optical system and the detection assembly is placed at the focus of the second optical system.
REFERENCES:
patent: 4007992 (1977-02-01), Petrohilos et al.
patent: 4332475 (1982-06-01), Demarest
patent: 4492473 (1985-01-01), Richter et al.
Photonetics S.A.
Westin Edward P.
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