ELECTROMAGNETICALLY REGULATED EXPOSURE CONTROL SYSTEM

摘要

An exposure control system characterized in the use of a solenoid which is energized to drive exposure mechanism blades into an aperture blocking position. An interval of exposure is defined by de-energizing the solenoid to permit the mechanism to define varying aperture values under a spring drive. The invention provides control over the rate of this aperture determining spring biased movement through the insertion of a select current level energization to the solenoid during the noted opening movement. Broader design latitudes for improved exposure programs are available with the arrangement.