Pyroelectric Sensor and Fresnel Lens Switching for Adjustable Detection Range
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Solution Overview
Problem
Sensing devices with fixed detection ranges due to varying light-condensing abilities of Fresnel lenses exhibit poor adaptability across multiple scenes.
Innovation Solution
A sensing device with a housing assembly, pyroelectric sensor, and a Fresnel lens featuring at least two Fresnel fringe areas with different light-condensing abilities, allowing relative movement between the pyroelectric sensor and Fresnel lens to adjust detection range through a moving assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a Fresnel lens with fixed light-condensing ability is used, then the structure is simple, but the detection range is fixed and adaptability across multiple scenes is poor
Solution Approach 1:
The Fresnel lens is divided into multiple Fresnel fringe areas with different light-condensing abilities, allowing selective use of different segments to achieve different detection ranges without requiring multiple separate lenses
Solution Approach 2:
The sensing device incorporates a moving assembly that enables dynamic switching between different Fresnel fringe areas, transforming the static lens into a dynamically adjustable optical system that can adapt to different detection range requirements
2Adaptability or versatility
If multiple pyroelectric sensors are used to achieve different detection ranges, then the detection range adaptability is improved, but the number of components and overall volume increase
Solution Approach 1:
A single pyroelectric sensor is designed to work with multiple Fresnel fringe areas, making the sensor universal and multi-functional. The same sensor can detect objects at different ranges by switching between different optical zones, eliminating the need for multiple specialized sensors
3Adaptability or versatility
If multiple Fresnel lenses with different light-condensing abilities are used, then the detection range is adjustable, but the number of components and production cost increase
Solution Approach 1:
Instead of manufacturing multiple separate Fresnel lenses, the invention segments a single Fresnel lens into multiple functional areas with different light-condensing properties. This segmentation approach reduces manufacturing complexity and cost while achieving the same effect as multiple lenses
Solution Approach 2:
Multiple Fresnel fringe areas with different light-condensing abilities are merged into a single lens structure, combining the functions of what would traditionally require multiple separate lenses into one integrated component, thereby reducing production cost and assembly complexity
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
Enables adjustable detection range, enhances multi-scene applicability, reduces component count and volume, lowers production and design costs, and simplifies structure while improving structural stability.
Implementation Method 1
the Fresnel lens includes at least two Fresnel fringe areas with different light-condensing abilities
Implementation Method 2
infrared rays or light can pass through one of the Fresnel fringe areas and reach the pyroelectric sensor
Implementation Method 3
a pyroelectric sensor provided or disposed on the housing assembly
Data Source
AI summary
Disclosed are a sensing device and an image capturing apparatus. The sensing device includes a housing assembly, a pyroelectric sensor disposed on the housing assembly, a Fresnel lens and a moving assembly. The Fresnel lens includes at least two Fresnel fringe areas with different light-condensing abilities; one of the pyroelectric sensor and the Fresnel lens is fixedly connected with the housing assembly, and another of the pyroelectric sensor and the Fresnel lens is movably coupled to the housing assembly through the moving assembly. The pyroelectric sensor and the Fresnel lens move relative to each other to switch between the Fresnel fringe area corresponding to the pyroelectric sensor. The disclosure can adjust the detection range and improve the multi-scene adaptability of the sensing device.