Intervals timer for cameras

摘要

An interval timer periodically provides a release signal output to a camera for controlling photographic operation by carrying out one exposure cycle and a successive automatic film winding operation. The interval timer provides circuitry for setting the interval between the occurrence of the successive release signals and includes first and second terminals adapted to be connected with the camera, the release signal being transmitted to the camera through the first terminal. Circuitry within the interval timer is responsive to a first reply signal transmitted from the camera at the second terminal for examining the time of the arrival of the first reply signal at the second termial to determine whether or not the time falls into a predetermined condition for controlling the operation of the interval timer circuitry for periodically producing the release signal.