Passive infrared sensor and obstacle detection system used in the same
First Claim
1. A passive infrared sensor where an infrared sensing element and an optical system that sets a detection area of the infrared sensing element are covered with a cover, the passive infrared sensor comprising:
- at least one light emitting element operable to emit infrared light from an inside of the cover to an outside of the cover through the optical system;
at least one reflective region disposed outside of the cover, the reflective region reflecting at least some of the infrared light emitted from the light emitting element; and
at least one light receiving element operable to receive the infrared light reflected by the reflective region, transmitted through the optical system and reaching the inside of the cover,wherein the reflective region is part of an undersurface of a projecting portion disposed outside of the cover.
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Accused Products
Abstract
According to one embodiment of a passive infrared sensor, a passive infrared sensor 1 where an infrared sensing element 5 and an optical system 4 that sets a detection area A1 of the infrared sensing element 5 are covered with a cover 2. The passive infrared sensor 1 includes: a light emitting element 6 that emits infrared light from the inside of the cover 2 to the outside through the optical system 4; a reflective region 2b that is disposed outside the cover 2 and reflects at least some of the infrared light emitted from the light emitting element 6; and a light receiving element 7 that receives the infrared light reflected by the reflective region 2b, transmitted through the optical system 4 and reaching the inside of the cover 2.
32 Citations
18 Claims
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1. A passive infrared sensor where an infrared sensing element and an optical system that sets a detection area of the infrared sensing element are covered with a cover, the passive infrared sensor comprising:
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at least one light emitting element operable to emit infrared light from an inside of the cover to an outside of the cover through the optical system; at least one reflective region disposed outside of the cover, the reflective region reflecting at least some of the infrared light emitted from the light emitting element; and at least one light receiving element operable to receive the infrared light reflected by the reflective region, transmitted through the optical system and reaching the inside of the cover, wherein the reflective region is part of an undersurface of a projecting portion disposed outside of the cover. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A passive infrared sensor where an infrared sensing element and an optical system that sets a detection area of the infrared sensing element are covered with a cover, the passive infrared sensor comprising:
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at least one light emitting element operable to emit infrared light from an inside of the cover to an outside of the cover through the optical system; at least one reflective region disposed outside of the cover, the reflective region reflecting at least some of the infrared light emitted from the light emitting element; and at least one light receiving element operable to receive the infrared light reflected by the reflective region, transmitted through the optical system and reaching the inside of the cover, wherein the reflective region is formed by a reflective member being disposed on the undersurface of the projecting portion disposed outside of the cover. - View Dependent Claims (13, 14, 15, 16)
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17. An obstacle detection system used in a passive infrared sensor where an infrared sensing element and an optical system that sets a detection area of the infrared sensing element are covered with a cover, the obstacle detection system comprising:
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at least one light emitting element operable to emit infrared light from an inside of the cover to an outside of the cover through the optical system; at least one reflective member disposed outside of the cover, the reflective member reflecting at least some of the infrared light emitted from the light emitting element; and at least one light receiving element operable to receive the infrared light reflected by the reflective member, transmitted through the optical system and reaching the inside of the cover, wherein the light emitting element and the light receiving element are disposed so that the direction in which the infrared light is emitted by the light emitting element and the direction in which the infrared light is received by the light receiving element both face diagonally upward, and the reflective member is disposed on an extension line of the direction in which the infrared light is emitted by the light emitting element and the direction in which the infrared light is received by the light receiving element. - View Dependent Claims (18)
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Specification