Optical Scanning Assembly With Adjustable Substrate Inclination
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Solution Overview
Problem
Existing optical scanning devices face challenges in accurately adjusting the inclination angle of optical elements when the light source and MEMS optical deflector are mounted on the same substrate, leading to deviations in light beam emission direction that cannot be adequately compensated by traditional adjustment methods.
Innovation Solution
The optical scanning device incorporates a substrate with through hole portions and columnar protruding portions that are plastically deformed to fit together, defining a relative inclination angle between the substrate and bottom plate through a fitting angle, allowing for compensation of deviations in light beam emission direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light source and MEMS optical deflector are mounted on the same substrate, then the device size is reduced, but the light beam emission direction deviates and cannot be adequately compensated
Solution Approach 1:
The invention divides the mounting structure into two separate components: a substrate for mounting the light source and a bottom plate for mounting the MEMS optical deflector. These are connected through columnar protruding portions that can be plastically deformed to adjust the relative inclination angle, thereby compensating for emission direction deviations while maintaining compact integration.
Solution Approach 2:
The invention introduces adjustable inclination angles through plastic deformation of columnar protruding portions, transforming the rigid fixed mounting into a dynamically adjustable structure. This allows the relative inclination angle between the substrate and bottom plate to be modified to compensate for light beam emission direction deviations.
2Manufacturing precision
If the inclination angle of optical elements is adjusted to compensate for emission direction deviation, then the alignment accuracy is improved, but the adjustment range is limited
Solution Approach 1:
The invention adds a new degree of freedom by introducing plastic deformation of columnar protruding portions, which enables adjustment of the relative inclination angle between the substrate and bottom plate. This provides an additional dimensional parameter for compensation beyond the traditional inclination angle adjustment of optical elements alone.
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
This method effectively adjusts and compensates for deviations in light beam emission direction, ensuring accurate alignment of optical elements and enhancing the device's performance by maintaining a predetermined optical path.
Implementation Method 1
at least one of the upper portion of the columnar protruding portion and the through hole portion is plastically deformed so that the two are fitted to each other
Data Source
AI summary
An optical scanning device includes a VCSEL and an emission unit mounted on the same substrate, and a bottom plate portion arranged on the lower side of the substrate. A columnar protruding portion has a tapered shape and is plastically deformable, and is fixed to the bottom plate portion. The columnar protruding portion has a distal end side inserted into a through hole portion of the substrate. At least one of an upper portion of the columnar protruding portion and the through hole portion is plastically deformed so that they are fitted to each other. A relative inclination angle between the substrate and the bottom plate portion is defined by a fitting angle between the through hole portion and the columnar protruding portion.