Patent
1980-11-03
1983-10-11
Brown, Thomas W.
179 81C, H04M 1100
Patent
active
044094370
ABSTRACT:
A power saving type indicator apparatus for a telephone line. Existence of one of input signals on a telephone line is indicated by actuating an indicator and existence of the other is indicated by deactuating the indicator so that the consumption of electric power in indicating the presence and absence of the input signals is reduced substantially. Furthermore, in connection with another indicator apparatus which indicates the presence of the other input signal by actuating the indicator, indication of signals is so controlled as not to indicate the same signal by actuating two indicators at the same time. Thereby, a further saving of electric power in indicating such signals will be attained. By saving the electric power consumed in signal indication in this manner, a substantial extention of useful life of such a communications system is attained.
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Brown Thomas W.
Canon Kabushiki Kaisha
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