Pivoting Lookdown Door for PIR Intrusion Detectors
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Solution Overview
Problem
Existing security systems, particularly intrusion detectors, are difficult to set up and use, especially when multiple sensors and varying security levels are involved, necessitating a simpler method for enabling and disabling the lookdown function without requiring tool-based disassembly and reassembly.
Innovation Solution
A PIR detector system with a pivoting lookdown door that can be easily moved between enabled and disabled positions using a single finger, without affecting the detection of radiant energy from the main area, and a design that minimizes parts for easy assembly and operation, allowing the lookdown function to be toggled without tools.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a mask or cover is used to selectively enable and disable the lookdown zone, then the lookdown function can be controlled, but the device complexity increases and tool-based assembly/disassembly is required
Solution Approach 1:
The lookdown door is extracted as a separate, removable component that can be independently manipulated. It is taken out from the main housing structure, allowing users to remove or install it without disassembling the entire detector unit, thus reducing assembly complexity while maintaining functional control.
Solution Approach 2:
The detector is segmented into functional modules: the main housing containing detection elements, and the separate lookdown door assembly. This segmentation allows the lookdown function to be controlled independently without affecting other detection zones, while simplifying overall device assembly and maintenance.
2Reliability
If multiple sensors and different levels of security are implemented, then comprehensive threat detection is achieved, but the system becomes difficult to set up and use
Solution Approach 1:
The lookdown door incorporates visual indicators and intuitive positioning features that guide users during installation and operation. The door's design includes alignment marks and snap-fit mechanisms that enable users to correctly install the component without technical expertise, reducing setup complexity while maintaining reliable lookdown zone activation.
3Ease of manufacture
If the lookdown door design includes visual indicators and alignment features, then ease of installation is improved, but the manufacturing complexity increases
Solution Approach 1:
Visual indicators on the lookdown door utilize color-coded markings or contrast-colored alignment features that are molded directly into the plastic components during manufacturing. These visual cues are integrated into the door's structure rather than added as separate elements, maintaining manufacturing efficiency while providing clear installation guidance.
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
Facilitates easy setup and operation of security systems by enabling and disabling the lookdown function without tools, reducing complexity and time, while maintaining effective detection of intruders and environmental threats, and offering a cost advantage with fewer parts and simplified assembly.
Implementation Method 1
a pivoting lookdown door for a passive infrared (PIR) detector... the pyroelectric element being tilted downwards to receive and detect... energy from an area extending outwards and directly in front of the PIR detector and a relatively small portion of energy from a floor area directly below the PIR detector
Implementation Method 2
a pyroelectric element mounted to a front surface of the base plate... the pyroelectric element being tilted downwards to receive and detect... energy
Implementation Method 3
a Fresnel lens mounted in front of the pyroelectric element that transmits the predominant portion of energy from the area directly in front of the PIR detector onto the pyroelectric element
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
A system including a security system that protects a secure geographic area and a passive infrared (PIR) detector of the security system that detects intruders within the secured area, a pyroelectric element carried by the PIR detector, the pyroelectric element being tilted downwards towards a floor within the secured area to receive and detect a predominant portion of energy from an area extending outwards PIR detector and directly in front of the PIR detector and a relatively small portion of energy from a floor area directly below the PIR detector and a pivoting door having a first and second positions mounted below and directly adjacent the pyroelectric element, the door pivoting upwards to a first position where the relatively small portion of energy is blocked and pivoting downwards where the relatively small amount of energy is transmitted onto the pyroelectric element.