Infrared Motion Sensor Arc-Shaped Adjustment Mechanism
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Solution Overview
Problem
Existing infrared motion sensors face challenges in setting a detection range that is simple, effective, and reproducible, often being limited by mechanical complexity, imprecision, and reliance on unreliable electronic signals or laborious shading elements.
Innovation Solution
The detection range is adjusted by moving the sensor unit along a predetermined arc-shaped path within the sensor housing, utilizing a pin-like actuating element and a carrier unit with a shielding section, allowing for precise and reproducible setting of maximum and minimum detection distances without relying on electronic sensitivity or pivoting the entire housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the sensor housing is rotated or pivoted to direct the lens unit to the desired target area, then the detection range can be limited, but the structural complexity and mechanical complexity increase
Solution Approach 1:
The device is divided into a stationary sensor housing and a movable sensor unit. The sensor unit can be independently adjusted along a guide path, separating the adjustment function from the entire housing structure. This segmentation allows detection range limitation without requiring the complex mechanical system of rotating or pivoting the whole housing.
2Area of stationary object
If detachable plastic plates are used to shade the lens surface, then the effective detection area can be delimited, but the procedure becomes laborious and impractical for non-technical users
Solution Approach 1:
The manual attachment of opaque plastic plates is replaced by a mechanical adjustment system. The sensor unit moves along a predetermined guide path within the housing, and its position is mechanically linked to the shading effect through the housing structure itself. This substitution transforms a laborious manual process into a simple positional adjustment that is easier to operate and more reproducible.
3Reliability
If electronic adjustment based on sensor signal strength is used, then the detection range can be modified, but the adjustment becomes difficult to reproduce accurately due to signal variability
Solution Approach 1:
Electronic adjustment based on variable sensor signals is replaced by a mechanical positioning system. The sensor unit's physical position along a guide path directly determines the detection range, creating a mechanical relationship between position and function. This mechanical substitution provides reproducible adjustment because the physical position can be precisely set and maintained, independent of signal strength variations caused by different detection objects.
4Measurement precision
If the sensor unit position is changed along a predetermined arc-shaped path, then the detection range can be precisely adjusted, but the device complexity increases
Solution Approach 1:
A guide path structure acts as an intermediary between the simple linear movement of the sensor unit and the complex arc-shaped trajectory required for precise detection range adjustment. The guide path is a stationary structural element that converts straightforward linear displacement into the desired arc-shaped motion, achieving precise adjustment without requiring complex active control mechanisms.
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
This approach enables flexible and accurate adjustment of the detection area, covering a wide range without the need for complex mechanical adjustments or unreliable electronic settings, making the system easy to use and adaptable to various environments.
Implementation Method 1
Infrared movement sensor... movements of people occurring in the detection area of the motion sensor can trigger light activation
Implementation Method 2
shading elements in the form of detachably attachable (and impermeable to infrared radiation) plastic plates
Data Source
Figure 1~4
Figure 5~8
Figure 9~11
AI summary
The sensor has a sensor unit for outputting electronic motion capturing signals and optically combined with a lens unit (12) in an infrared sensitive manner, where the unit is housed in a sensor housing (10). A manually operated adjusting knob (22) is used for changing and/or adjusting a collection region of a maximum and/or minimum effective collection distance of the sensor. The knob causes a predetermined translocation of the sensor unit at the housing along a predetermined curved adjusting path.