Fluid handling – Systems – Programmer or timer
Patent
1996-11-12
1998-06-02
Lee, Kevin
Fluid handling
Systems
Programmer or timer
25112904, 4623, F16K 3102
Patent
active
057586888
ABSTRACT:
In an automatic faucet having a hand sensor S to start and stop discharging water automatically, only hands can be detected accurately without detecting a washbowl (chinaware) and water stream erroneously. The sensor S comprises a light emitter and a light receiver. The directional axis d of a detection region (in which the light emitting region of the light emitter and the light receiving region of the light receiver are overlapped with each other) intersects the discharged water stream, and further the intersection angle between both is adjusted less than 70 degrees, irrespective of the flow rate of the discharged water. The reflected light levels detected by the light receiver are sampled periodically to calculate an average value and a variance value on the basis of at least eight most updated sampled data. Water discharge is started and stopped on the basis of the calculated average value and the variance value.
REFERENCES:
patent: 3662406 (1972-05-01), Giglio
patent: 4119276 (1978-10-01), Nelson
patent: 4767922 (1988-08-01), Stauffer
patent: 4894874 (1990-01-01), Wilson
patent: 4921211 (1990-05-01), Novak et al.
patent: 5033508 (1991-07-01), Laverty, Jr.
patent: 5566702 (1996-10-01), Philipp
Hamanaka Tatsumi
Honda Tadahiro
Iwashita Hiroyuki
Kaneko Yoshiyuki
Kawabata Takatoshi
Lee Kevin
Toto Ltd.
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