Rodent discriminator lens

Details Rodent discriminator lens Rodent discriminator lens

1995-08-15

1996-09-17

Willis, Davis L.

Radiant energy

Invisible radiant energy responsive electric signalling

Infrared responsive

250DIG1, 359742, G02B 308, G01J 508

Patent

active

055571069

ABSTRACT:
A lens segment used in passive infrared motion detectors is disclosed. A preferred embodiment has semi-circular rings separated by grooves. The semi-circular rings are offset about a separation axis passing through their centers or optical axes. The separation axis effectively divides the lens segment into two subsegments causing projection of two cross-sectional areas of coverage, one offset from the other. This increases the size of the projected cross-sectional area of coverage preventing a rodent near the lens from substantially filling the projected cross-sectional area of coverage, thus avoiding detection of the rodent.

REFERENCES:
patent: 4757204 (1988-07-01), Baldwin et al.
patent: 4912331 (1990-03-01), Owers
patent: 4994664 (1991-02-01), Veldkamp
patent: 5071207 (1991-12-01), Ceglio et al.
patent: 5442178 (1995-08-01), Baldwin

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