Infrared Motion Sensor Detection Range Adjustment via Spindle Mechanism
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Solution Overview
Problem
Existing infrared motion sensors face challenges in setting a precise and manageable detection range, with complex structures, limited adjustment ranges, and laborious handling of shading elements, making it difficult to achieve optimal detection area coverage and avoid false activations.
Innovation Solution
A linearly adjustable shading element, connected to a manually operable spindle or spindle nut, allows for precise metering of the detection range by converting rotational movements into linear adjustments, enabling easy expansion or limitation of the detection area without relying on electronic sensitivity settings or pivoting the entire sensor housing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a sensor housing is designed to be rotated or pivoted to direct the lens unit to the desired target area, then the detection area can be directed appropriately, but the structure becomes structurally and mechanically complex
Solution Approach 1:
The invention divides the sensor housing into a stationary main housing and a separate, adjustable detection head containing the lens unit and sensor. This segmentation allows the detection head to be independently positioned and oriented without requiring the entire housing to be movable, thereby achieving adaptability while maintaining structural simplicity of the main housing.
Solution Approach 2:
Instead of rotating or pivoting the sensor housing in horizontal or vertical planes, the invention introduces a new dimensional approach by allowing the detection head to be adjusted along the optical axis (depth dimension) and laterally, enabling precise targeting through linear displacement rather than rotational movement.
2Adaptability or versatility
If shading elements are arranged in a pivotable manner on the outside of a housing to limit the lens surface, then the detection area can be adjusted, but the procedure becomes laborious and not very practical to use
Solution Approach 1:
The invention merges the shading element adjustment mechanism with the lens unit positioning system. The same adjustable structure that positions the lens unit also provides the shading effect, eliminating the need for separate pivotable shading elements and simplifying the adjustment procedure to a single integrated operation.
Solution Approach 2:
The detection head's adjustable structure serves dual functions: it positions the lens unit and simultaneously creates the necessary shading effect by its very configuration. This self-service approach eliminates the need for additional dedicated shading mechanisms, making the adjustment process more practical and user-friendly.
3Extent of automation
If electronic adjustment based on signal strength is used to set the detection range, then electronic control is achieved, but the signals are constant over larger distance ranges making simple electronic adjustment difficult
Solution Approach 1:
The invention replaces complex electronic adjustment mechanisms with a simple mechanical adjustment system for the detection head. This mechanical positioning approach provides direct, intuitive control over detection range through physical displacement, avoiding the complexity of electronic signal evaluation while maintaining precision through straightforward geometric relationships.
4Device complexity
If a single sensor unit is used in an infrared motion sensor, then the structure is simple, but the detection range is limited
Solution Approach 1:
The invention extends the detection range beyond what a single sensor unit can provide by introducing spatial dimensionality through an adjustable detection head that can be positioned at multiple locations and orientations. This allows coverage of larger areas by strategically positioning multiple detection heads rather than using a single complex sensor array.
Solution Approach 2:
The invention makes the detection head dynamically adjustable in position and orientation, allowing a single sensor unit to effectively cover multiple detection zones by repositioning the detection head to different locations and angles, thereby achieving extended detection range without increasing sensor 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
This solution provides a simple, accurate, and intuitive method to set the detection range, allowing for effective coverage of large areas like 360° without the need for laborious screen attachments or unreliable electronic signal evaluations, and protects the adjustment mechanism from environmental influences.
Implementation Method 1
Infrared motion sensor with a sensor unit (7) and an adjusting device (11) for changing and/or setting a detection range of the sensor unit (7)
Data Source
Figure 1
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AI summary
The sensor (1) has sensor units (7) working together with a stationary lens unit and outputting an electronic movement detection signal. A detection range changing and/or adjusting unit comprises a manually operated adjusting device (11) for adjusting a cover (9) relative to the sensor units, where the adjusting device is accommodated in a sensor housing (4). The adjusting device includes a threaded element (12) designed as a spindle or spindle nut and causes position change of the cover along a linear movement path, where the cover or the threaded element is designed as a plastic element.