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Development of a Bionic Bistable Compliant Mechanism for the LDI Machine
Ruizhou Wang1,2, Junhong Li1, Hua Wang3
1State Key Laboratory of Precision Electronic Manufacturing Technology and Equipment, Guangdong University of Technology, Guangzhou 510006, China.
Micromachines
|June 26, 2026
Summary
This study introduces a bionic bistable compliant mechanism (BBCM) for laser direct imaging (LDI) machines. The BBCM reduces energy consumption during fast focusing while maintaining visual measurement accuracy.
Area of Science:
- Mechanical Engineering
- Robotics
- Biomimetics
Background:
- Rigid mechanisms (RMs) are standard in laser direct imaging (LDI) machines' vision-based measurement (VBM) systems.
- Constant-stiffness compliant mechanisms (CMs) enhance RMs but suffer from high energy use and poor adaptability in fast focusing.
Purpose of the Study:
- To propose a novel bionic bistable compliant mechanism (BBCM) inspired by biological structures to overcome the limitations of constant-stiffness CMs in LDI machines.
- To analyze the dynamic stiffness and bistable characteristics of the BBCM for energy-efficient focusing.
Main Methods:
- Developed a bionic bistable compliant mechanism (BBCM) mimicking ligament and tendon structures.
- Established a numerical model to analyze the variable-stiffness and bistable properties.
- Conducted prototype tests to validate performance under camera-loaded flying-shot conditions.
Main Results:
- The BBCM demonstrated a bistable response and dynamic feasibility.
- Achieved a 12.37% reduction in electrical and 9.74% in mechanical energy consumption compared to constant-stiffness CMs.
- Maintained comparable visual measurement performance in target recognition tasks.
Conclusions:
- The bionic bistable compliant mechanism (BBCM) offers a viable mechanism-level solution for energy-efficient dual-position focusing in LDI machines.
- The BBCM's dynamic stiffness characteristics enable reduced energy consumption during rapid focusing while ensuring stability.
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