Electric control circuitry for camera shutters

Claim 2

A photographic camera of the type having a battery actuated control circuit for controlling exposure and blocking release of a trailing member of a shutter for a time interval subsequent to the release of the leading member of the shutter wherein the blocking apparatus comprises: means for detecting incorrect movement of said leading and trailing members as an indication that the battery voltage is insufficient for blocking release of said trailing member. a first means responsive to said means for detecting for blocking operation of the camera when the movement of said leading and trailing members is incorrect; and a second means for restoring the normal operative condition of the camera with replacement of the defective battery.

Claim 3

A photographic camera as in claim 1, wherein the camera includes a mechanism for winding film and cocking said leading and trailing member and said first means blocks said winding and cocking mechanism when said means for detecting indicates the battery voltage is insufficient for retaining said trailing curtain, and said second means unblocks said winding and cocking mechanism with replacement of the defective battery.

Claim 4

A photographic camera as in claim 2, wherein said first means includes means for locking said winding and cocking mechanism; said second means includes means for unlocking said means for locking when said means for detecting indicates the battery voltage is sufficient for blocking the release of said trailing member; and further comprising: means for inhibiting said means for unlocking when said means for detecting indicates the battery has an insufficient voltage for blocking the release of said trailing member; and means for actuating the operation of said means for unlocking with replacement of the defective battery.

Claim 5

A photographic camera as defined in claim 3, wherein said mechanism for winding and cocking includes: a locking member for locking said winding and cocking mechanism subsequent to a winding and shutter cocking operation and further comprising; a first pin member rotatable with movement of said leading member and a second pin member rotatable with movement of said trailing member, the movement of said leading and trailing members is in response to shutter releasing operation; said means for detecting including a first operating lever mounted in a position within the path of rotary movement of said first pin member and rotatable together with said first pin member upon engagement therewith and a second operating lever mounted in a position within the path of rotary movement of said second pin member and rotatable together with said second pin member upon engagement therewith; said means for inhibiting includes means for blocking the operation of said second operating lever when said first and second pin members are rotated in association with the leading and trailing members, respectively, and said means for actuating includes a blocking member rotated by the rotary movement of said second operating lever, a third operating lever for rotating said blocking member with replacement of said battery, and a releasing member locked by said blocking member and unlocked by rotary movement of said blocking member whereby said means for unlocking is actuated by said releasing member.