PNEUMATICALLY REACTIVE PHOTOGRAPHIC EXPOSURE CONTROL SYSTEM

摘要

An exposure control system and mechanism characterized in the use of a solenoid which is energized to retract a plunger within an excitation winding thereof to cause movement of exposure mechanism blades into an aperture blocking position. An interval of exposure is defined by de-energizing the excitation winding of the solenoid to permit the plunger thereof to be withdrawn under a spring drive which simultaneously moves the exposure mechanism to define varying aperture values. The invention provides control over the rate of both closing interval and aperture determining spring biased movement of the exposure mechanism. This control is provided by pneumatically regulating the movement of the plunger within the excitation winding.