Optical system for intruder detecting device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Apr 30, 1985
Grant Date -
N/A
app pub date -
Sep 14, 1982
filing date -
Jan 19, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical system for an intruder detector which employs an infrared ray detecting element and a parabolic mirror above the infrared detecting element for collecting infrared rays from a detection region and directing them onto the infrared ray detecting element, and which has a detecting range through a wide visual field of 360.degree.. Reflecting mirrors 3 having the visual field of 360.degree. are disposed around the outside of a parabolic mirror and confront the parabolic mirror 1 around the outer periphery of the infrared ray detecting element 2. A window 5 which transmits infrared rays and does not shield the visual field of the mirror 3 mounts the parabolic mirror 1 at a prescribed position with respect to a base 6. A convex lens 15 located at the conical axis of the parabolic mirror 1 forms another detection region directly under the intruder detecting device. The intruder detector using this optical system is mainly for mounting on the ceiling of a house.
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