G - Physics – 01 – J
Patent
G - Physics
01
J
340/155, 95/77
G01J 1/04 (2006.01) F23M 11/04 (2006.01)
Patent
CA 1038472
SHUTTER FOR OPTICAL DETECTION ABSTRACT OF THE DISCLOSURE 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 another sleeve end, 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 dia- meter 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.
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