G - Physics – 03 – B
Patent
G - Physics
03
B
95/45, 95/55
G03B 7/22 (2006.01) G03B 9/08 (2006.01) G03B 9/34 (2006.01) G03B 17/42 (2006.01) G03B 17/55 (2006.01)
Patent
CA 1112927
ABSTRACT OF THE DISCLOSURE In an aerial reconnaissance photographic camera, the exposure aperture 15c of a revolvable focal plane shutter blind is varied by varying the relative positions of an outer part 15a and an inner part 15b of the blind. Two helical driving gears 22 and 23, of opposite hand to each other and fixed on a common shaft 24, respectively drive helical gears 19 and 21 (also of opposite hand to each other) the gear 19 driving outer blind part 15a through one pulley and belt system, the gear 21 driving inner blind part 15b through another pulley and belt system. Axial displacement of shaft 24 produces relative rotation between gears 19 and 21 and hence variation of aperture 15c. The shaft 24 is rotated (by co-axial shaft 11) at a speed directly proportional to aircraft speed and inversely proportional to aircraft height, with the result that the frequency of the exposures is variable, and the shaft 24 is displaced axially according to its speed (to compensate for the speed of the shutter by varying the aperture) and according to the light conditions.
324718
Aeronautical & General Instruments Limited
Marks & Clerk
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