Drive Element Joint Surface Inclination for Stress Dispersion
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Solution Overview
Problem
Existing drive elements that rotate a movable part for high-frequency and high-deflection-angle applications, such as in laser scanning devices, face stress issues that can lead to connection part breakage due to localized high stress.
Innovation Solution
A drive element design featuring a connection part with joint surfaces that are symmetrical and parallel to the rotation axis, dispersing stress over a larger area to alleviate high stress concentrations, thereby preventing connection part breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the movable part is driven at high frequency and high deflection angle, then the light scanning performance is improved, but the connection part may break due to high stress
Solution Approach 1:
The patent changes the geometric parameters of the joint surfaces by inclining them relative to the rotation axis. This parameter modification allows the connection part to withstand high-frequency and high-deflection-angle operation without breaking, resolving the contradiction between productivity and reliability.
2Device complexity
If the joint surface is perpendicular to the rotation axis, then the structure is simple, but high stress localizes on the joint surface causing connection part breakage
Solution Approach 1:
The patent modifies the orientation parameter of the joint surface by inclining it at a specific angle relative to the rotation axis. This simple parameter change redistributes stress across the joint surface, preventing localization and maintaining connection part strength without complicating the overall structure.
3Reliability
If the joint surface is inclined and symmetrical to the rotation axis, then stress is dispersed preventing breakage, but the manufacturing precision requirement increases
Solution Approach 1:
The patent employs symmetrical inclination of joint surfaces relative to the rotation axis. This symmetric design, while requiring precise manufacturing, provides balanced stress distribution that significantly improves connection part reliability during high-frequency operation.
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
Enables stable operation at high frequencies and deflection angles without connection part damage, ensuring reliable light deflection and scanning performance.
Implementation Method 1
piezoelectric drivers are respectively disposed on a pair of arm parts extending along a rotation axis. When AC voltages having phases different from each other by 180° (opposite phases) are applied to these piezoelectric drivers, respectively, the pair of arm parts expand and contract in directions opposite to each other.
Data Source
AI summary
A drive element includes: a movable part; a drive part configured to rotate the movable part about a rotation axis; and a connection part connecting the drive part to a fixing part. The movable part, the drive part, and the fixing part are aligned along the rotation axis. The connection part is connected to the fixing part via at least one pair of joint surfaces that are not orthogonal to the rotation axis and that are symmetrical with respect to the rotation axis.