Segmented Piezoelectric Drive Beam for Optical Scanning Stress Relief
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Solution Overview
Problem
Conventional optical scanning devices face challenges in alleviating stress on piezoelectric bodies used to drive the drive beam, which can lead to surface fractures and reduced performance.
Innovation Solution
The optical scanning device incorporates a drive beam with a piezoelectric portion partitioned by grooves, where the piezoelectric bodies are reduced in length as they approach the fixed and drive ends, alleviating stress and preventing surface fractures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the piezoelectric portion is made as a single continuous structure, then it can provide uniform driving force, but stress concentrates and causes surface fractures
Solution Approach 1:
The piezoelectric portion is divided into multiple piezoelectric bodies through grooves, transforming a continuous structure into segmented units. This segmentation distributes the stress across multiple smaller elements, preventing stress concentration that would cause surface fractures in a continuous structure.
Solution Approach 2:
The piezoelectric bodies are designed with varying lengths along the drive beam, creating local quality differences. The length of each piezoelectric body corresponds to the stress distribution pattern, with shorter bodies in high-stress regions and longer bodies in low-stress regions, optimizing both strength and reliability.
2Ease of manufacture
If the piezoelectric bodies are made with uniform length, then manufacturing is simplified, but stress distribution is uneven causing performance degradation
Solution Approach 1:
The piezoelectric bodies have non-uniform lengths that match the local stress requirements at different positions along the drive beam. This local quality variation ensures that each piezoelectric body is optimally sized for its specific location, improving operational reliability while maintaining acceptable manufacturing complexity through standardized groove formation processes.
3Device complexity
If the piezoelectric portion is not partitioned, then the structure is simpler, but stress alleviation is insufficient leading to reduced durability
Solution Approach 1:
The piezoelectric portion is partitioned into multiple piezoelectric bodies using grooves, which prevents stress concentration and surface fractures. This segmentation significantly improves durability by distributing mechanical stress across multiple smaller elements, even though it increases structural complexity.
Solution Approach 2:
The grooves are formed in advance during the manufacturing process to create the segmented piezoelectric bodies. This preliminary action of partitioning the piezoelectric portion before operation ensures stress alleviation from the outset, extending the operational life and durability of the drive beam.
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 design effectively reduces stress on piezoelectric bodies, enhancing the durability and performance of the drive beam by partitioning the piezoelectric portion into shorter segments, thereby preventing surface fractures and improving operational reliability.
Implementation Method 1
The piezoelectric portion is partitioned by grooves to include a plurality of piezoelectric bodies... The piezoelectric bodies are disposed to be reduced in length in the second direction as the piezoelectric bodies approach the fixed end, and the piezoelectric bodies are disposed to be reduced in length in the second direction as the piezoelectric bodies approach the drive end
Data Source
AI summary
An optical scanning device includes a mirror and a drive beam. The drive beam includes a piezoelectric portion. The piezoelectric portion is partitioned by a plurality of first grooves into a plurality of piezoelectric bodies. The piezoelectric bodies are reduced in length in an X-axis direction as the piezoelectric bodies approach one end side connected to an anchor. The piezoelectric bodies are reduced in length in the X-axis direction as the piezoelectric bodies approach the other end side connected to a link beam.