Timing device capable of synchronizing initiation time
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United States of America Patent
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Oct 20, 1998
Grant Date -
N/A
app pub date -
Oct 10, 1996
filing date -
Mar 31, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A timing device which is associated with a light level sensor and which is arranged to provide a time-out signal to a relay after a predetermined time has elapsed following detection of a low light condition and initial energization of the relay. The device provides for synchronization of an initiation time T.sub.1 and, hence, a time-out signal generating time T.sub.2 with respect to a periodically occurring event time T.sub.3 (for example, sunset time) in order that the desired time of generating the time-out signal might be re-established following interruption of power to the device. Should loss of power occur, the last entered event time T.sub.3 is employed to synchronize the initiation time T.sub.1 and, hence, the signal generating time T.sub.2, when detection of a predetermined light level next occurs following re-establishment of power to the device.
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