Program-controlled shutter

Details Program-controlled shutter Program-controlled shutter

1975-10-14

1977-10-11

Adams, Russell E.

354 23D, 354 31, 354 49, 354 59, 354 60A, G03B 714

Patent

active

040539075

ABSTRACT:
In exposure means comprising, in combination, two shutter blades which also function as the aperture setting blades, a step-motor for displacing the shutter blades stepwise in response to the driving pulse or pulses, and a driving circuit for the step-motor. Slits are cut through the shutter blades so that the relative displacement between the shutter blades may be optically detected in order to control the stepwise rotation of the step-motor, thereby displacing the shutter blades to define the main aperture stepwise; and when the light from a subject reaches a predetermined level, detecting means causes the step-motor to reverse its rotation, thereby closing the shutter blades. The program-controlled shutter in accordance with the present invention is very simple in construction and is free from any erratic operations.

REFERENCES:
patent: 3900855 (1975-08-01), Stempeck
patent: 3945025 (1976-03-01), Stempeck

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