Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1980-11-25
1983-05-24
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250216, G01D 534
Patent
active
043852343
ABSTRACT:
An optical system for an optical encoder of the type having an optical code disc with a plurality of code tracks, and a multichannel photodetector for receiving modulated light from the code tracks, the optical system comprising a light source for producing a line of light, an optional collimating lens for receiving divergent rays of light from said light source and for directing the light in generally parallel rays toward the code disc, an objective lens disposed between the collimating lens and the code disc for focussing the light in a sharp line on the code disc, a housing for supporting the collimating lens and having a seat for receiving the objective lens, an aperture plate having an aperture slit therein aligned with the objective lens, and means for holding the aperture plate on the housing with the objective lens retained between the seat and the plate. Flanges may be provided on the housing to retain the aperture plate, preferably in a flexed position in engagement with the objective lens, which may be cylindrical, semicylindrical, or in the form of a doublet or a triplet. A grating may be substituted for the plate and the objective lens. In an alternative construction, the aperture plate may be molded into a cylindrical objective lens.
REFERENCES:
patent: 4039826 (1977-08-01), Wingate
patent: 4047586 (1977-09-01), Dlugos
patent: 4221328 (1980-09-01), Kramer
BEI Electronics, Inc.
Nelms David C.
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