Security Sensor Device Switching Between Low and High Place Mounting
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Solution Overview
Problem
Conventional passive type infrared human body detection devices face limitations in high-place mounting detection reliability and accuracy, particularly in excluding false detections due to temperature sources and small animals, and struggle to switch between low-place and high-place mounting modes effectively.
Innovation Solution
A security sensor device with multiple sensor units and optical systems, including a switching unit that adjusts the configuration between sensor units and optical systems to perform both low-place and high-place mounting detections, utilizing a visual field restriction member and secondary mirror to change detection areas and exclude false positives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a passive type infrared human body detection device is mounted at a high place to perform high-place mounting detection, then the detection area can be expanded to detect both distant and close targets, but the reliability of detection decreases due to false detections from temperature sources and small animals
Solution Approach 1:
The detection device is divided into multiple sensor units (first sensor unit and second sensor unit) with different detection characteristics. The first sensor unit is optimized for distant target detection while the second sensor unit is optimized for close target detection, allowing the system to segment the detection task and reduce false detections by using appropriate sensors for appropriate zones.
Solution Approach 2:
Different sensor units are assigned different detection characteristics tailored to their specific detection areas. The first sensor unit has characteristics suitable for distant detection (lower place mounting characteristics) while the second sensor unit has characteristics suitable for close detection (higher place mounting characteristics), creating local optimization throughout the detection area.
2Reliability
If a passive type infrared human body detection device is designed for low-place mounting detection, then false detection can be excluded by using AND circuit logic, but the device cannot perform high-place mounting detection effectively
Solution Approach 1:
The detection device is designed with multi-functionality to perform both low-place mounting detection and high-place mounting detection using the same hardware configuration. The device universally handles different mounting scenarios by switching between sensor units, eliminating the need for separate devices for different mounting modes.
Solution Approach 2:
The device dynamically switches between different sensor units based on the mounting mode. A switching unit selects between the first sensor unit (for low-place mounting) and the second sensor unit (for high-place mounting), allowing the system to adapt its detection characteristics dynamically to the installation environment.
3Area of stationary object
If multiple sensor units with different detection characteristics are used to expand detection area, then the device complexity increases, but the detection coverage and reliability improve
Solution Approach 1:
Multiple sensor units with different detection characteristics are merged into a single integrated device. The first sensor unit and second sensor unit are combined with a switching unit that manages their operation, creating a unified system that achieves expanded detection coverage without requiring separate devices for each sensor unit.
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 accurate human body detection across a wider range while minimizing false alarms, allowing for reliable high-place and low-place mounting operations with a single device by adjusting detection areas and angles.
Implementation Method 1
an infrared ray detection element (232A, 232B, 242A, 242B) having a visual field in a predetermined target direction
Implementation Method 2
a plurality of optical systems (120A1 to 120A3, 120B1 to 120B3) through which detection rays transmit from a corresponding detection area to each infrared ray detection element
Implementation Method 3
a secondary mirror (226A, 226B) for reflecting the detection rays
Implementation Method 4
a visual field restriction member (220) that blocks a part of a visual field of the predetermined infrared ray detection element
Data Source
AI summary
A security sensor device includes: a plurality of sensor units each of which includes an infrared ray detection element having a visual field in a predetermined target direction, the plurality of sensor units aligned in a predetermined arrangement direction; a plurality of optical systems through which detection rays transmit from a corresponding detection area to each infrared ray detection element, the plurality of optical systems aligned in the predetermined arrangement direction; a target object detection circuit into which an output signal is input from each infrared ray detection element; and a switching unit which is configured to change a configuration between each of the plurality of sensor units and the plurality of optical systems according to a user operation, so that two detections of low-place mounting detection and high-place mounting detection are respectively performed.