Microphone Seal and PIR Sensor Layout for Compact Security A/V Units
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Solution Overview
Problem
Conventional audio/video devices for home or business security are aesthetically unappealing, have large form factors, and suboptimal audio and/or video characteristics.
Innovation Solution
A device with a housing, front and rear covers, incorporating a camera for imaging, passive infrared (PIR) sensors for motion detection, and a microphone assembly with acoustic isolation, designed to enhance motion sensing and audio capturing capabilities, featuring a microphone seal and vertically stacked PIR sensors with a Fresnel lens for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional devices are used for security monitoring, then basic video and audio communication functions are provided, but the devices have large form factors and suboptimal audio/video characteristics
Solution Approach 1:
The patent combines multiple security monitoring functions (video capture, audio capture, motion detection, and communication) into a single integrated device. The camera assembly and microphone assembly are merged within one housing structure, allowing the device to provide comprehensive security monitoring while maintaining a compact form factor that is aesthetically pleasing for wall mounting.
Solution Approach 2:
The patent employs nested structures where the camera assembly and microphone assembly are positioned within the housing in a nested arrangement. The lens assembly and microphone elements are contained within dedicated assemblies that fit within the overall device housing, enabling compact integration of multiple components without increasing the external form factor.
2Shape
If conventional devices are used for security monitoring, then basic functions are provided, but the devices are aesthetically unappealing
Solution Approach 1:
The patent segments the device into distinct functional modules (camera assembly, microphone assembly, housing) that can be independently optimized. The front cover and housing are designed with clean, modern lines and minimal protrusions, while the internal assemblies maintain their functional complexity. This segmentation allows aesthetic optimization of the external appearance while preserving detection accuracy through specialized internal components.
3Measurement precision
If multiple sensors are added to improve motion detection, then detection accuracy is enhanced, but device complexity increases
Solution Approach 1:
The lens assembly serves multiple functions: it focuses light for the camera, directs infrared radiation to the PIR sensors, and provides structural support for the sensor array. The housing structure simultaneously provides mechanical protection, acoustic isolation for the microphone, and mounting surfaces for all sensors. This multi-functionality reduces the need for separate dedicated components for each sensor type, thereby managing complexity while enhancing detection accuracy.
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 device provides enhanced motion and audio capturing abilities with improved aesthetics and reduced form factor, allowing for more accurate detection and recording of motion and audio.
Implementation Method 1
passive infrared (PIR) sensors for motion detection
Implementation Method 2
vertically stacked PIR sensors with a Fresnel lens for improved performance
Implementation Method 3
microphone assembly with acoustic isolation, designed to enhance motion sensing and audio capturing capabilities
Data Source
AI summary
A device includes a housing, a first cover coupled to the housing, a second cover coupled to the housing, and a microphone assembly. The first cover includes a first channel. The microphone assembly includes a printed circuit board (PCB) having a microphone and a second channel, and a seal. The seal has a third channel configured to align with the first channel and the second channel, and a cavity. The seal is configured to transition between an unfolded state in which the PCB is insertable into the cavity, and a folded state in which the PCB is at least partially enclosed within the cavity and the microphone is enclosed within the cavity.