Stepped Oscillation Parts for Optical Reflecting Device
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Solution Overview
Problem
Conventional optical reflecting devices face challenges in maintaining mechanical strength at folded portions of oscillation parts, leading to potential cracking when increasing scanning speed and frequency, which affects the resolution and reliability of projected images.
Innovation Solution
The optical reflecting device incorporates a stepped structure in the folded portions of oscillation parts, enhancing mechanical strength and allowing for larger pivotal angles and higher frequencies without damaging the components, by using a thicker stepped structure that distributes stress and maintains structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the driving frequency is increased to improve scanning speed and resolution, then the scanning speed and resolution are improved, but stress is focused on the folded portions of oscillation parts causing cracks and reducing reliability
Solution Approach 1:
The patent applies local quality by providing a stepped structure specifically at the folded portions of the oscillation parts where stress concentration occurs. This localized structural modification reinforces the vulnerable areas without changing the entire oscillation part design, allowing high-frequency operation while preventing cracks at the critical folded sections.
2Productivity
If the driving frequency is increased to improve scanning speed, then the scanning speed is improved, but the mechanical strength of folded portions deteriorates leading to cracking
Solution Approach 1:
The stepped structure is provided locally at the folded portions to enhance mechanical strength precisely where stress concentration occurs during high-frequency operation. This localized reinforcement enables the oscillation part to withstand the increased stress from higher driving frequencies without cracking.
Solution Approach 2:
The stepped structure acts as a pre-designed stress distribution mechanism that prevents crack initiation and propagation at folded portions before they can fail under high-frequency driving conditions. This structural feature is built-in advance to cushion against the stress concentration that would otherwise occur during high-speed operation.
3Length of moving object
If the amount of displacement of oscillation parts is increased to improve scanning range, then the scanning range is improved, but stress on folded portions increases causing cracks
Solution Approach 1:
The stepped structure provides localized reinforcement at the folded portions, enabling larger displacements to be achieved without compromising the structural integrity. This allows the oscillation parts to undergo greater movement while the stepped sections prevent stress concentration that would lead to cracking.
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 configuration improves the mechanical strength of folded portions, enabling increased driving frequency and pivotal angles, thus enhancing the resolution and reliability of projected images while preventing damage from stress, resulting in improved productivity and yield.
Implementation Method 1
A driving element such as a piezoelectric body is formed in each of the plurality of straight portions 9a
Data Source
AI summary
An optical reflecting device includes a fixed frame, a pair of first oscillation parts, a movable frame, a pair of second oscillation parts, and a mirror part. One-side ends of the first oscillation parts are connected to the inside of the fixed frame. The movable frame is connected to and held by the other-side ends of the pair of first oscillation parts to be pivotable. One-side ends of the pair of second oscillation parts are connected to the inside of the movable frame and the pair of second oscillation parts are disposed to be substantially perpendicular to the pair of first oscillation parts. The mirror part is connected to and held by the other-side ends of the pair of second oscillation parts to be pivotable. The first oscillation parts have a meandering shape in which a plurality of straight portions and a plurality of folded portions are formed, and a stepped structure portion is provided in part of the folded portion.