Movable Mirror Sound Reflector for Blind Spot Detection
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Solution Overview
Problem
Existing blind spot monitoring systems for vehicles face accuracy issues due to interference from reflections at guardrails and limitations in detecting road users without active turn signals, particularly when using radar sensors.
Innovation Solution
An apparatus with a movable mirror assembly and a microphone assembly that uses sound reflections to detect road users in the blind spot, combining sound emissions with other sensor data to improve accuracy, and featuring a foldable mirror design and MEMS microphones for directional sound detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Difficulty of detecting and measuring
If radar sensors are used to capture road users in the blind spot, then detection capability is improved, but measurement precision deteriorates due to reflections at guardrails
Solution Approach 1:
The patent introduces a movable mirror element as an intermediary between the sound source (road user) and the microphone assembly. This mirror reflects sound emissions toward the microphone, enabling indirect detection that avoids direct line-of-sight interference from guardrails and other reflective surfaces. The mirror acts as a mediator that redirects acoustic energy to the sensor without being affected by the same reflection issues that plague radar sensors.
2Ease of manufacture
If a stationary mirror surface is used, then ease of manufacture is improved, but adaptability deteriorates due to inability to adjust detection angles
Solution Approach 1:
The patent transforms the static mirror surface into a dynamic system by introducing a movable mirror element that can be actuated to different positions and orientations. This allows the mirror to dynamically adjust its reflection angle based on the detected sound direction, enabling the system to adapt to different detection scenarios while maintaining the simplicity of a basic mirror structure. The movability is controlled based on sound direction determination to optimize detection coverage.
3Measurement precision
If multiple separate sensors are used to improve detection accuracy, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple detection functions into a single integrated apparatus. The movable mirror element serves dual purposes: it maintains the rearview mirror function for driver visibility while simultaneously acting as a sound reflector for blind spot detection. The microphone assembly integrates sound direction determination with the mirror structure, eliminating the need for separate radar sensors and reducing overall system complexity while maintaining 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
Enhances the accuracy of detecting road users in the blind spot by utilizing sound reflections and foldable mirror technology, providing a continuous mirror surface and efficient sound detection, thereby improving the driver's awareness of potential collisions during lane changes.
Implementation Method 1
The movable mirror element is in the form of a sound reflector... the mirror element of the apparatus is used to deflect or reflect sound in the desired manner to the microphone assembly
Implementation Method 2
The microphone assembly is designed to determine the sound direction... sound emissions emitted by or originating from other road users in the blind spot are therefore detected and captured
Data Source
AI summary
An apparatus for monitoring the blind spot of a motor vehicle has a mirror assembly with at least one mirror element that can be moved using an actuator, and a microphone assembly. The microphone assembly is designed to determine the sound direction, and the movable mirror element is in the form of a sound reflector.