Trapezoidal Pir Sensor Lens With Fresnel Sections
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Solution Overview
Problem
Conventional sensor modules for lighting fixtures are bulky and aesthetically unappealing due to large sensor covers that limit the detection area and require separate installation, often providing only limited information about the surrounding environment.
Innovation Solution
A compact sensor module with a housing and a sensor cover featuring a combination of parallel and angled surfaces with Fresnel lens sections, allowing for a larger and more uniform field of view, enabling comprehensive environmental sensing without the need for separate installation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional dome shaped sensor covers are used to provide line-of-sight to the surrounding environment, then the sensor can detect light from the surrounding area, but the sensor module becomes bulky and aesthetically unappealing, requiring separate installation
Solution Approach 1:
The sensor cover is divided into multiple lens sections (first number of lens sections on the parallel surface, second number of lens sections on the angled surface) that collectively provide wide detection coverage. Each lens section focuses light from a different portion of the task surface to the light sensor, achieving comprehensive detection without requiring a large single dome structure
Solution Approach 2:
The sensor cover transitions from a conventional three-dimensional dome shape to a substantially two-dimensional planar structure with parallel and angled surfaces. This dimensional reduction allows the sensor module to be compact and aesthetically pleasing while maintaining detection capability through the distributed lens sections that capture light from various directions
2Loss of information
If large sensor covers are used to capture light from a large surrounding area, then more comprehensive environmental information is provided, but the sensor module becomes bulky and requires separate installation
Solution Approach 1:
The sensor module is merged with the lighting fixture as an integrated unit, eliminating the need for separate installation. The compact sensor cover with its planar design and distributed lens sections achieves comprehensive environmental detection while being small enough to be seamlessly integrated into the lighting fixture housing
Solution Approach 2:
The detection area is segmented into multiple zones covered by different lens sections (first subset and second subset of task surface), allowing comprehensive environmental information to be captured through a compact structure that can be easily installed as part of the lighting fixture
3Reliability
If conventional sensor covers are used, then the sensor is protected, but the detection area is limited and the module is bulky
Solution Approach 1:
The sensor cover employs multiple lens sections distributed across parallel and angled surfaces, where each lens section focuses light from a different portion of the task surface to the light sensor. This segmentation enables a compact protected structure to achieve a larger effective detection area than a single large cover would provide
Solution Approach 2:
The sensor cover uses a substantially two-dimensional planar structure with parallel and angled surfaces instead of a three-dimensional dome, allowing the detection area to be expanded through the angular arrangement of lens sections while maintaining a compact protected form factor
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 provides a larger and more uniform field of view, enhancing the detection area and aesthetic appeal of lighting fixtures by integrating the sensor module directly into the fixture, while maintaining a compact design.
Implementation Method 1
The first number of lens sections and the second number of lens sections each comprises a Fresnel lens
Implementation Method 2
each of which are configured to focus light from a different portion of a first subset of the task surface to the light sensor
Data Source
AI summary
A sensor module for a lighting fixture includes a housing configured to be mounted to a lighting fixture, a light sensor mounted in the housing, and a sensor cover over the light sensor. The sensor cover includes a parallel surface and an angled surface. The parallel surface is parallel to a task surface within an area of interest, and includes a first number of lens sections, each of which are configured to focus light from a different portion of a first subset of the task surface to the light sensor. The angled surface includes a second number of lens sections, each of which extend from an edge of the parallel surface to form a facet of the angled surface and are configured to focus light from a different portion of a second subset of the task surface to the light sensor.