Intruder perceiving apparatus by means of infrared detection
First Claim
1. An infrared detecting apparatus for perceiving an intruder into a predetermined region on the ground or on a floor by detecting infrared rays radiated from said intruder, said apparatus comprising:
- a lens assembly provided higher than a predetermined height above said ground or floor and said predetermined region, said lens assembly having a plurality of differently angled non-overlapping visual fields directed to said predetermined region, said visual fields distributed so that an intruder having a stature taller than said predetermined height simultaneously crosses more than one of said visual fields of said lens assembly at a time and an intruder of a stature less than said predetermined height only crosses one of said visual fields at a time;
a single infrared radiation detecting element for converting infrared rays converted by said lens assembly to an electric signal; and
an amplifier means for amplifying said electric signal;
whereby an output of said amplifier is a continuous electric signal if said intruder is of a stature greater than said predetermined height and pulse electric signal if said intruder is of a stature less than said predetermined height.
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Accused Products
Abstract
An apparatus for perceiving an intruder by means of detecting infrared rays radiated from the intruder through a plurality of detectable infrared flux enveloping spaces spanned supposedly between the infrared receiving portion of the apparatus and a plurality of sub-domains supposed on the ground, the detectable infrared flux enveloping spaces being arranged densely so that at least two of them may always be crossed by an intruder, and such a dense arrangement of the detectable infrared flux enveloping spaces being effected with a multi-lens system molded in one body so as to have on its surface a plurality of infrared converging lenses having their respective principal axes differently directed providing the detectable infrared flux enveloping spaces.
34 Citations
6 Claims
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1. An infrared detecting apparatus for perceiving an intruder into a predetermined region on the ground or on a floor by detecting infrared rays radiated from said intruder, said apparatus comprising:
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a lens assembly provided higher than a predetermined height above said ground or floor and said predetermined region, said lens assembly having a plurality of differently angled non-overlapping visual fields directed to said predetermined region, said visual fields distributed so that an intruder having a stature taller than said predetermined height simultaneously crosses more than one of said visual fields of said lens assembly at a time and an intruder of a stature less than said predetermined height only crosses one of said visual fields at a time; a single infrared radiation detecting element for converting infrared rays converted by said lens assembly to an electric signal; and an amplifier means for amplifying said electric signal; whereby an output of said amplifier is a continuous electric signal if said intruder is of a stature greater than said predetermined height and pulse electric signal if said intruder is of a stature less than said predetermined height. - View Dependent Claims (2, 3, 4, 5, 6)
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Specification