Communications: electrical – Condition responsive indicating system – Specific condition
Patent
1994-06-28
1995-10-03
Swann, Glen
Communications: electrical
Condition responsive indicating system
Specific condition
340522, 340541, 340600, G08B 1319
Patent
active
054555647
ABSTRACT:
A light device which includes a fluorescent lamp may be manually turned on by a switch or may be automatically turned on when a human body is approaching within a predetermined distance and environmental lightness is below a predetermined level. The light device includes a DC/AC converter which when triggered by an auxiliary DC voltage can output a high frequency AC voltage to turn on the fluorescent lamp. A relay which is normally open is connected between the auxiliary DC voltage and the DC/AC converter. A battery charging device includes a rechargable battery which is charged when the switch is turned on and provides the auxiliary voltage when the switch is turned off. A human body detecting device generates a human approaching indicative signal in response to a human body approaching in a predetermined distance. A light illumination detecting device detects environmental lightness and outputs a lightness insufficiency indicative signal when the environmental lightness is less than a predetermined level. A timer/driving device energizes the relay in response to the presence of the human approaching indicative signal and the lightness insufficiency indicative signal, thus triggering the DC/AC converter to output the high frequency AC voltage to turn on the fluorescent lamp.
REFERENCES:
patent: 4663521 (1987-05-01), Maile
patent: 5015994 (1991-05-01), Hoberman et al.
patent: 5077549 (1991-12-01), Hershkovitz et al.
patent: 5128654 (1992-07-01), Griffin et al.
patent: 5309145 (1994-05-01), Branch et al.
patent: 5349330 (1994-09-01), Diong et al.
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