Rotatable Adjustment Ring for PIR Sensor Mirror Focal Length
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Solution Overview
Problem
Adjusting the optical mirror in passive infrared (PIR) detectors used in security systems is difficult, time-consuming, and inefficient, affecting the detection of threats within secured areas.
Innovation Solution
A rotatable adjustment ring system that simultaneously adjusts the focal length of multiple mirrors in PIR detectors, allowing for quick and precise alignment with varying mounting heights, enabling effective detection of motion and intruders by accommodating different ceiling heights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual adjustment of optical mirrors is used in PIR detectors, then the focal length can be adjusted to accommodate different mounting heights, but the adjustment process becomes difficult, time-consuming, and frustrating
Solution Approach 1:
Multiple mirrors are merged into a single adjustment system where one adjustment mechanism controls the focal length of all mirrors simultaneously. This combines what would otherwise be separate adjustment operations into a unified process, resolving the contradiction by making the system adaptable to different mounting heights while simplifying the operation to a single adjustment action.
Solution Approach 2:
The adjustment mechanism is designed to perform multiple functions by simultaneously adjusting multiple mirrors to the same focal length setting. This universal adjustment capability allows a single mechanism to handle various mounting heights for multiple sensors, improving ease of operation while maintaining full adaptability.
2Manufacturing precision
If individual mirrors are adjusted separately to achieve proper focal length, then each mirror can be optimized for its specific position, but the overall adjustment process becomes complex and time-consuming
Solution Approach 1:
The patent merges multiple individual mirror adjustments into a single synchronized operation. By linking all mirrors to a common adjustment mechanism, the system achieves precise focal length alignment for all mirrors simultaneously, eliminating the time loss associated with sequential individual adjustments while maintaining the precision needed for proper optical alignment.
Solution Approach 2:
The adjustment mechanism is designed to pre-establish the correct focal length setting for all mirrors in a single operation. This preliminary simultaneous adjustment eliminates the need for repeated individual tweaks, reducing the time required while ensuring precise alignment is achieved from the start.
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 adjustment ring system simplifies the process of setting the focal length of PIR detectors, enhancing their ability to detect motion and intruders by ensuring strong signal reception and accurate threat detection within secured areas.
Implementation Method 1
A known PIR detector includes an optical mirror that can be focused
Data Source
AI summary
Systems and methods for adjusting a focal length of a mirror are provided. Some systems can include an adjustment device having an slot, a mirror that is rotatable about an axis, and a drive coupled to the mirror and configured to engage the slot, wherein movement of the adjustment device can cause the drive to move within the slot upwards or downwards in accordance with a slope of the slot, thereby rotating the mirror about the axis.