Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1975-07-07
1976-11-23
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
250233, 250554, G01D 534
Patent
active
039939006
ABSTRACT:
A shutter, for an optical detector head having a sleeve containing a focusing lens adjacent a first sleeve open end for directing incident radiation onto a photocell positioned at the other sleeve end, and includes a rotatable spherical shutter member of an optically opaque material and having a diametric aperture normally axially aligned between the photocell and the lens. A mask member having a central aperture of lesser diameter than the diameter of the shutter member is transversely positioned across the sleeve bore adjacent the surface of the shutter member nearest the lens, whereby incident radiation will be focused by the lens to pass through the aligned mask and shutter apertures to the photocell when the shutter aperture axis is aligned to be along the focal line of the lens. Low-friction bearing means formed through a portion of the sleeve wall rotatably engage a cylindrical pin having a first end joined to the surface of the shutter member perpendicular to the shutter aperture axis to achieve uniform rotational mass distribution; another end of the pin projects beyond the exterior of the sleeve and includes vane means engaged by bias means for rotatably positioning the shutter aperture axis in the normally aligned condition. Electrically controllable means cooperates with the vane means for applying a torque to the shutter member whereby the aperture axis is rotated away from alignment along the lens focal line thereby blocking the mask aperture and preventing incident radiation from impinging on the photocell.
REFERENCES:
patent: 1929400 (1933-10-01), Schulte
patent: 2100934 (1937-11-01), Berges
patent: 3336482 (1967-08-01), Mierendorf et al.
patent: 3906222 (1975-09-01), Astier et al.
Nelms David C.
Societa Italiana Elettronica S.p.A.
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