Decoupled XY Micro-Positioning Stage With Flexible Hinges
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Solution Overview
Problem
Current Micro LED repair technologies face challenges in achieving precise and fast positioning due to the small size of Micro LED chips, leading to difficulties in accurate chip placement.
Innovation Solution
A decoupled XY parallel micro-positioning stage is designed, comprising a central moving platform, bridge-type micro-displacement amplification mechanisms, four-bar symmetrical flexible guide mechanisms, and a piezoelectric ceramic, which symmetrically arranges bridge-type micro-displacement amplification mechanisms with respect to the X and Y axes, utilizing flexible hinges for frictionless motion and amplifying micro-displacement for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a linear motor is used to drive a movable shaft for positioning, then the positioning speed can be improved, but the positioning precision deteriorates due to the large size of the movable shaft relative to the small Micro LED chips
Solution Approach 1:
The positioning system is divided into two independent stages: a coarse positioning stage that handles large movements and a fine positioning stage that handles micro-adjustments. This segmentation allows each stage to be optimized for its specific function, resolving the contradiction between speed and precision.
Solution Approach 2:
A decoupled XY parallel mechanism is introduced as an intermediary between the linear motor and the Micro LED chip. This mechanism amplifies the motor's movement while maintaining precision through its parallel structure and flexible guides, acting as a mediator that transforms large motor movements into precise chip positioning.
2Device complexity
If traditional positioning structures are used, then the device complexity is low, but the positioning precision deteriorates due to mechanical friction and coupling errors
Solution Approach 1:
Traditional mechanical friction-based connections are replaced with flexible guide mechanisms that use elastic deformation instead of friction. This substitution eliminates mechanical friction and coupling errors while maintaining structural simplicity through the use of flexible materials and geometric constraints.
Solution Approach 2:
The system changes the physical parameters of the guiding mechanism by using flexible materials with specific elastic properties. This allows the guides to deform elastically under load, providing frictionless guidance and eliminating the precision losses associated with traditional rigid mechanical contacts.
3Measurement precision
If bridge-type micro-displacement amplification mechanisms are symmetrically arranged, then the positioning precision is improved through decoupling, but the device complexity increases
Solution Approach 1:
While the overall arrangement is symmetrical for balance, the individual bridge-type mechanisms use asymmetric beam configurations optimized for their specific directional functions. This allows each mechanism to be tailored for maximum efficiency in its orientation while maintaining system-level symmetry for decoupling.
Solution Approach 2:
The bridge-type micro-displacement amplification mechanisms serve multiple functions simultaneously: they amplify displacement, provide mechanical guidance, enable decoupling of X and Y movements, and maintain system symmetry. This multi-functionality reduces the need for separate components, managing complexity while achieving precision.
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
The solution provides high-speed, high-precision, and stable micro-positioning capabilities, reducing mechanical friction and coupling errors, enabling accurate and efficient Micro LED chip repair by amplifying micro-displacement and maintaining system balance through a mirror-symmetrical structure.
Implementation Method 1
a piezoelectric ceramic; wherein the plurality of bridge-type micro-displacement amplification mechanisms are symmetrically arranged with respect to an X axis and a Y axis centered on the central moving platform... the piezoelectric ceramic is arranged between the two first longitudinal beams
Implementation Method 2
the plurality of crossbeams are respectively connected to the two first longitudinal beams and the two second longitudinal beams via a flexible hinge
Data Source
AI summary
A decoupled XY parallel micro-positioning stage, including a central moving platform, fixed mechanisms, bridge-type micro-displacement amplification mechanisms, a four-bar symmetrical flexible guide mechanism and a piezoelectric ceramic. Each fixed mechanism is arranged between adjacent amplification mechanisms and is symmetrical about X and Y axes centered on the moving platform. The amplification mechanism is symmetrically arranged with respect to the X and Y axes, and includes two first and second longitudinal beams and multiple crossbeams. The two first longitudinal beams are provided in parallel and spaced apart. The two second longitudinal beams are arranged spaced apart between the two first longitudinal beams, and are connected to the two first longitudinal beams via the crossbeams. The crossbeams are connected to the longitudinal beams via a flexible hinge. The piezoelectric ceramic is arranged between the two first longitudinal beams.