| 摘要 |
1,043,472. Photographic cameras. COMPUR-WERK G.m.b.H. March 23, 1965 [April 10 1964], No. 12135/65. Heading G2A. The exposure period of the shutter of a photographic camera is controlled electrically by a pulse generator feeding a number of series connected frequency dividers whose outputs can be selectively connected to an amplifier controlling a solenoid in the path of the shutter operating mechanism. The frequency dividers can be flip-flops or pre-magnetized ring cores. The shutter is set by turning the blade ring 50 against the spring 52. Upon release by the lever 9, the shutter blades 46 are stopped in the open position by the core 36a of solenoid 36 engaging projection 50c on the ring. The shutter is held open for the preselected exposure until a pulse from the appropriate frequency divider operates solenoid 36 to release the shutter. A cam 50d engages a switch member 54 at the start of the shutter run down to make the electrical circuit operative. In an embodiment a camera for taking series pictures has a pivoted shutter blade controlled by two solenoids, one operated by a regular pulse and the other by a pulse from a frequency divider associated with the selected exposure time. In a further embodiment the camera shutter is electrically controlled to provide either series pictures or single pictures. |
