Decorative Lighting Fixture With Hidden PIR Motion Detector
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Solution Overview
Problem
Existing decorative lighting fixtures with passive infra-red (PIR) motion detectors often have obtrusive designs or are costly to integrate into certain styles, making it difficult to conceal the motion detector while maintaining a decorative appearance.
Innovation Solution
A motion-activated decorative lighting fixture with a PIR motion detector hidden behind a decorative slotted wall, utilizing a segmented Fresnel lens array and cylindrical housing that forms an integral part of the fixture, allowing for cost-effective manufacture and concealment of the motion detector within the fixture's design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the motion detector is integrated into the decorative body of the fixture, then the motion detector becomes less obtrusive and more concealed, but it becomes difficult to conceal the motion detector while maintaining a decorative appearance in certain fixture styles
Solution Approach 1:
The motion detector housing is segmented into multiple functional zones: a decorative exterior wall with slots for aesthetic purposes, an intermediate section with Fresnel lens array for optical functionality, and an interior chamber housing the PIR sensor. This segmentation allows each component to fulfill its specific role while collectively achieving both concealment and adaptability to decorative styles.
Solution Approach 2:
The housing structure serves multiple functions simultaneously: it provides mechanical protection for the sensor, acts as a decorative element matching various fixture styles through its slotted wall design, functions as an optical system with Fresnel lens array for wide-field detection, and integrates mounting features for installation. This multi-functionality resolves the contradiction by making the motion detector adaptable to different decorative styles while maintaining effective concealment.
2Ease of manufacture
If the motion detector is concealed within the fixture body, then the decorative appearance is preserved, but the field of view and detection sensitivity may be limited
Solution Approach 1:
The Fresnel lens array introduces an optical dimension to the concealed motion detector system. By using lenslets arranged in columns that refract and focus infrared energy from multiple angles onto the PIR sensor, the system achieves a wide field of view despite being hidden within the fixture body. This optical dimensionality change allows the concealed detector to maintain high detection sensitivity and broad monitoring coverage.
Solution Approach 2:
The Fresnel lens array acts as an intermediary between the external environment and the concealed PIR sensor. The lens array captures infrared energy from a wide field of view and redirects it to the sensor, enabling the hidden motion detector to achieve detection sensitivity and field of view comparable to exposed detectors while preserving the decorative appearance of the fixture.
3Ease of operation
If a traditional motion detector housing is used, then the components are easy to install, but the motion detector is obtrusive and detracts from the ornamental style
Solution Approach 1:
The motion detector housing merges the traditionally separate components (detector unit, lens assembly, mounting bracket, and decorative element) into a single integrated structure. The housing itself is designed with decorative slotted walls that match various fixture styles, eliminating the need for separate mounting brackets or外露 detector housings. This merging maintains installation simplicity while completely resolving the obtrusiveness issue and preserving ornamental style.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively hides the motion detector while preserving the decorative appearance and enabling a wide field of view, achieving a harmonious integration with the lighting fixture's design without increasing costs, allowing for flexible field of view adjustments and enhanced sensitivity.
Implementation Method 1
a segmented Fresnel lens array is disposed within the housing behind the slots to direct infra-red energy from a monitored field of view to a sensor
Implementation Method 2
One or more PIR sensors are disposed within the housing... to detect infra-red energy from a monitored zone
Data Source
AI summary
A motion-activated decorative lighting fixture with a PIR motion detector hidden behind a decorative slotted wall of the fixture body. The motion-activated decorative lighting fixture includes a motion detector housing that forms an integral part of the lighting fixture body. The housing includes a slotted vertically extending exterior wall around the housing with an array of elongate vertically extending slots horizontally spaced apart from one another and extending along at least a portion of the wall. One or more PIR sensors are disposed within the housing, and a segmented Fresnel lens array is disposed within the housing behind the slots to direct infra-red energy from a monitored field of view to a sensor. The lens array includes a plurality of columns of lenslets, at least a portion of which have at least two lenslets disposed one above the other. Each column is aligned with a corresponding slot so as to direct infra-red energy from a monitored zone passing through the corresponding slot to a sensor. The configuration defines an optical path for infra-red energy emanating from a detection zone in the field of view, the optical path passing through a given slot and a lenslet aligned with the slot and on to a PIR sensor.