Low-cost PIR scanning mechanism

Details Low-cost PIR scanning mechanism Low-cost PIR scanning mechanism

2011-01-25

2011-01-25

Porta, David P (Department: 2884)

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

Reexamination Certificate

active

07875853

ABSTRACT:
A passive infrared sensor (PIR) for detecting infrared radiation which includes a lens positioned in a sensor housing, and a pyroelectric element electrically connected to a circuit board within a filter housing positioned in the sensor housing. A microprocessor is electrically connected to a main circuit board and controls a liquid crystal display (LCD) attached to the sensor housing. The lens overlaps the LCD. The LCD has LCD regions corresponding to lens regions of the lens. Using the microprocessor, the LCD regions selectively prevent radiation energy from passing to the pyroelectric element, and the LCD regions selectively allow radiation energy to pass to the pyroelectric element. A signaling device communicates an alarm signal indicating when radiation energy within a specified wavelength band reaches the pyroelectric element.

REFERENCES:
patent: 5774261 (1998-06-01), Omori et al.
patent: 6239437 (2001-05-01), Barone
patent: 6881957 (2005-04-01), Dougherty et al.
patent: 7005990 (2006-02-01), Rocci
patent: 7145455 (2006-12-01), Eskildsen et al.
patent: 2006/0038680 (2006-02-01), Eskildsen et al.

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