Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means
Patent
1977-12-19
1980-04-08
Gellner, Michael L.
Radiant energy
Ionic separation or analysis
Static field-type ion path-bending selecting means
250231SE, 250239, 350276SL, G01D 534, G02B 2700, G03B 300, H01J 502
Patent
active
041969944
ABSTRACT:
A photo-electric pulse generating unit for monitoring the focus position of a camera objective lens driven in response to a range detection system and operative to generate pulses on rotation of a lens coupled encoder wheel having angularly spaced apertures movable in relation to a detector unit housing the photo-electric pulse generating unit. The unit mounts a pulse generating photo-transistor in alignment with a light source such that the photo-transistor is spaced behind an opaque wall opening to "tunnel" light from a light source upon passing through an aperture in the encoder wheel. Light diffusing surface irregularities are provided to prevent impingement of reflected or ambient light on the photo-transistor.
REFERENCES:
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patent: 3886534 (1975-05-01), Swiden et al.
patent: 3942112 (1976-03-01), Westbrook
patent: 4047106 (1977-09-01), Robinson
Leinert et al. Stray Light Suppression in Optical Space Experiments, Applied Optics Mar. 1974, pp. 556-564.
Halter, E. A. Photoemitter for Recording Information, IBM Tech. Disclosure Bulletin, Mar. 1967, pp. 1374-1375.
de Jesus Charles
Hudspeth William
Gellner Michael L.
Polaroid Corporation
Tarcza Thomas H.
Thornton David R.
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