Battery-operated security system sensors
First Claim
1. A security system sensor comprising:
- a lens lying in a forward plane for focusing received energy to a focal point rearward of the forward plane;
a sensing element having a forward surface located substantially at the focal point of the lens, the sensing element defining a rearward plane that is immediately rearward of the sensing element and parallel to the forward plane of the lens, the and the sensing element defining a funnel-shaped chamber that is substantially vacant and encompasses the volume between the lens and the forward surface;
a battery housing positioned such that a battery power source contained therein has the majority of its volume rearward of the funnel-shaped chamber and forward of the rearward plane; and
wherein the security system sensor has a volume of about 15 cubic inches or less.
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Accused Products
Abstract
A security system sensor has a lens lying in a forward plane that focuses received energy to a focal point that is internal to the sensor. A sensing element is located at or near the focal point of the lens. A funnel-shaped chamber between the lens and the focal point is substantially vacant so that received energy is received by the sensing element. A battery housing is positioned so that the physical volume of a battery power source contained therein is mainly rearward of the lens and the vacant funnel-shaped chamber, yet forward of a plane that is immediately rearward of the sensing element. Also, a dividing barrier, interposed between the chamber and the battery power source, extends to and seals with the sensing element and the lens, thereby providing a seal for the vacant, funnel-shaped chamber.
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Citations
19 Claims
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1. A security system sensor comprising:
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a lens lying in a forward plane for focusing received energy to a focal point rearward of the forward plane; a sensing element having a forward surface located substantially at the focal point of the lens, the sensing element defining a rearward plane that is immediately rearward of the sensing element and parallel to the forward plane of the lens, the and the sensing element defining a funnel-shaped chamber that is substantially vacant and encompasses the volume between the lens and the forward surface; a battery housing positioned such that a battery power source contained therein has the majority of its volume rearward of the funnel-shaped chamber and forward of the rearward plane; and wherein the security system sensor has a volume of about 15 cubic inches or less. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless PIR sensor comprising:
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a forwardly bowing Fresnel lens lying in a forward plane for focusing received PIR energy to a focal point rearward of the forward plane; a PIR sensing element having a forward surface located substantially at the focal point of the Fresnel lens, the PIR sensing element defining a rearward plane that is immediately rearward of the PIR sensing element and parallel to the forward plane of the Fresnel lens, the Fresnel lens and the PIR sensing element defining a funnel-shaped chamber that is substantially vacant and encompasses the volume between the Fresnel lens and the forward surface; and a battery housing positioned such that a user-replaceable battery power source contained in the battery housing has the majority of its volume rearward of the funnel-shaped chamber and forward of the rearward plane. - View Dependent Claims (12, 13)
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14. A wireless PIR sensor comprising:
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a housing comprising a front cover and a back mounting plate mateable with one another, the front cover having a bowed front surface with an opening over which a Fresnel lens is mounted, the Fresnel lens for focusing PIR energy toward a focal point internal to the housing; a PIR sensing element having a forward surface located substantially at the focal point of the Fresnel lens; and a sub-chassis contained within the housing, the sub-chassis having a funnel-like configuration with a front opening facing and corresponding in size to the Fresnel lens and a rear opening providing access and corresponding in size to the PIR sensing element, wherein the sub-chassis in combination with the Fresnel lens and the PIR sensing element forms a sealed chamber. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification