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US 4,395,658 AGranted
Proper light emission indicating device for computer flash device
AssigneeCanon Kabushiki Kaisha
InventorTadashi Okino
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Abstract
In the disclosed device, a sensor produces a corroborating signal when a computer flash unit emits a flash proper for an exposure. A timer energizes an indicator for a predetermined time in response to the corroborating signal. When the sensor produces a subsequent corroborating signal in response to another flash, while the indicator is energized, a reset device resets the timer. According to one embodiment of the invention, an overriding arrangement connected to the timer nullifies the operation of the timer a predetermined time after a flash emission.
Claims2
An indicating device for a computer flash unit comprising:
- sensing means for producing a confirmation signal when a flash causing a proper exposure has been emitted;
- indicating means for producing a signal;
- timing means for energizing the indicating means for a predetermined time interval in response to a confirmation signal;
- reset means for resetting the timing means when a confirmation signal occurs during energization of the indicating means by said timing means;
- and
- overriding means connected to said timing means to nullify the operation of the timing means when a predetermined time has elapsed after initiation of a flash.
3 more elements
Dependencies are inferred from the claim text.