Telephonic communications – Telephone line or system combined with diverse electrical...
Patent
1989-08-11
1991-03-26
Ng, Jin F.
Telephonic communications
Telephone line or system combined with diverse electrical...
379102, 379100, H04M 1100
Patent
active
050035789
ABSTRACT:
A power saving device for a cable-information receiving/transmitting apparatus, for example, a facsimile machine or a computer. The device allows no AC power to be supplied to the apparatus during the stand-by time thereof. When ring signals arrives, or when the user picks up the handpiece of a telephone set attached to the apparatus, the Ac power supply is started. When the reception or transmission of information is over, the Ac supply is cut off after a predetermined time, thus allowing the after-reception work or after-transmission work to be finished. This device mainly comprises a relay (1) [or a SCR (1a)], a transistor (T), an optical coupler (3) [preferably consisting of a LED (31) and a CdS photoresistor (32)], and a tapping/rectifying circuit (2). It can totally eliminate the undeserved waste due to the consumption during the stand-by time.
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patent: 4647721 (1987-03-01), Busam et al.
patent: 4656318 (1987-04-01), Noyes
patent: 4700380 (1987-10-01), Ahuja
patent: 4701946 (1987-10-01), Oliva et al.
patent: 4907249 (1990-03-01), Nebel
Ng Jin F.
Woo Stella L.
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