Mirror Module Stray Light Reduction via Internal Display Nesting
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Solution Overview
Problem
Existing ranging apparatuses face issues with stray light production due to the placement of information display units on the outer surface of mirror modules, which can reflect laser light and increase the module's size, necessitating a solution to prevent stray light while allowing for visible information display without enlarging the module.
Innovation Solution
A mirror module configuration with deflection mirrors that transmit visible light and reflect non-visible laser light, featuring an information display unit positioned between the deflection mirrors and the mirror mounting surfaces, and an antireflection layer on the mirror support to minimize stray light reflection without compromising mounting accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If the information display unit is disposed on the outer surface of the mirror module, then the information is visible, but stray light is generated and the module size increases
Solution Approach 1:
The information display unit is nested inside the mirror module, specifically disposed between the deflection mirror and the mirror mounting surface. This internal placement allows the information to remain visible through the transparent deflection mirror while preventing stray light generation that would occur with external surface mounting.
Solution Approach 2:
The information display unit is positioned in the optical path dimension between the deflection mirror and mounting surface, utilizing the space along the light path rather than on the external surface. This dimensional repositioning enables visibility through the mirror while avoiding stray light issues.
2Loss of information
If the information display unit is disposed on the outer surface of the mirror module, then the information is visible, but the module size increases
Solution Approach 1:
The information display unit is nested within the existing internal space of the mirror module, between the deflection mirror and mounting surface. This eliminates the need for additional external space that would be required if the display unit were mounted on the outer surface.
Solution Approach 2:
The deflection mirror serves dual functions: it deflects the laser light for scanning and simultaneously acts as a transparent window through which the information display unit can be viewed. This multi-functionality eliminates the need for separate external display housing.
3Object-generated harmful factors
If an antireflection layer is added to the mirror support, then stray light is reduced, but mounting accuracy may be compromised
Solution Approach 1:
The antireflection layer is applied selectively to specific regions of the mirror support where stray light reflection occurs, while leaving the mirror mounting surface regions without the coating to maintain mounting accuracy. This localized application resolves the contradiction between reducing stray light and preserving precision.
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 solution effectively prevents stray light occurrence while allowing for visible information display within the module, maintaining accurate mounting and improving ranging accuracy by integrating the information display unit without increasing the module's size.
Implementation Method 1
The deflection mirror has a reflective surface that allows visible light to be transmitted therethrough and reflects the non-visible laser light
Implementation Method 2
an antireflection layer on the mirror support to minimize stray light reflection
Data Source
AI summary
A mirror module that deflects a non-visible laser light for scanning the non-visible laser light is provided with a deflection mirror; a mirror support; and an information display unit. The deflection mirror has a reflective surface that allows a visible light to be transmitted therethrough and reflects the non-visible laser light. The mirror support has a mirror mounting surface of which the shape corresponds to a shape of the reflective surface. The information display unit displays information related to the mirror module in a visible manner. The information display unit is disposed between the deflection mirror and the mirror mounting surface.