Moving object detector and moving object detecting system
First Claim
1. A moving object detector, comprising:
- a) a plurality of detecting means for detecting infrared rays radiated by a moving object for producing a plurality of element signals;
b) an optical system for receiving infrared rays and for converging the infrared rays onto said plurality of detecting means;
c) producing means responsive to the plurality of element signals for producing a detecting signal when there is a predetermined time difference between the plurality of element signals; and
,d) said optical system comprises a hemispherical hood having a lens unit, a base connected to said hood and being loaded with said plurality of detecting means, a case holding said hood and said base to a bearing member and for permitting rotation of said hood and said base relative to said case.
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Abstract
Infrared rays radiated from a moving object is converged into a plurality of infrared ray detectors by optical system. Detecting area is instituted by the optical system so as to put the infrared rays into a plurality of the infrared ray detectors with time difference therebetween. Signal processing unit produces a detecting signal when there is a predetermined time difference between signals produced by a plurality of the infrared ray detectors. It is possible to avoid wrong operation which is caused by popcorn noise and a differential noise having a bit of time difference caused by temperature gradient in space. Forming a curved imaginary boundary line, a plurality of detecting zones are disposed at out side and inside of the curved imaginary boundary line to detect the object invading from any direction.
34 Citations
19 Claims
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1. A moving object detector, comprising:
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a) a plurality of detecting means for detecting infrared rays radiated by a moving object for producing a plurality of element signals; b) an optical system for receiving infrared rays and for converging the infrared rays onto said plurality of detecting means; c) producing means responsive to the plurality of element signals for producing a detecting signal when there is a predetermined time difference between the plurality of element signals; and
,d) said optical system comprises a hemispherical hood having a lens unit, a base connected to said hood and being loaded with said plurality of detecting means, a case holding said hood and said base to a bearing member and for permitting rotation of said hood and said base relative to said case. - View Dependent Claims (2, 3)
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4. A moving object detector system, comprising:
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a) a cylindrical support having an open end; b) a base member positioned within said support and being movable relative thereto; c) a hemispheric hood closing said open end and being movable relative to said base member, at least a portion of said hood is comprised of a material permitting infrared radiation transmission therethrough and providing a lens; e) at least first and second detector means secured to said base member and cooperating with said hood portion for receiving infrared radiation and generating an element signal in response thereto; and e) processing means operably associated with each of said detector means for generating a detection signal upon receipt of an element signal from each of said detector means within a predetermined period. - View Dependent Claims (5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification