Macro-to-micro Two-stage Camera Lens Focusing Device
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Solution Overview
Problem
Existing camera lens focusing technologies face challenges in achieving large-scale, high-speed, high-precision, and high-stability focusing due to increased friction and wear from multi-head threads, leading to loosening or sticking issues, which hinder precise and efficient industrial measurement.
Innovation Solution
A macro-to-micro two-stage camera lens focusing device utilizing a direct-drive air floatation platform with aerostatic air flotation, linear motors, piezoceramic actuators, and flexure hinges, enabling rapid coarse focusing and precise micro-motion focusing, with the macro-motion system moving at 1 meter per second and micro-motion system achieving 20 nanometers precision.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-head threads are used for lens barrel linear motion, then focusing function is achieved, but friction force increases causing wear and tear, loosening or sticking
Solution Approach 1:
The patent replaces the traditional mechanical screw nut focusing mechanism with a direct-drive air floatation platform that uses aerostatic bearing technology. This substitution eliminates the multi-head threads that cause friction and wear, achieving smooth linear motion of the lens barrel without mechanical contact between moving parts.
Solution Approach 2:
The patent introduces an air floatation platform that utilizes pneumatic principles to create a frictionless environment. The aerostatic bearing generates an air film between the moving components, allowing the lens barrel to move linearly without mechanical contact, thereby eliminating friction force and wear and tear associated with traditional mechanical focusing mechanisms.
2Productivity
If traditional single-stage focusing is used, then device complexity is low, but focusing speed and precision cannot achieve high-speed high-precision requirements
Solution Approach 1:
The patent divides the focusing system into two independent stages: a coarse focusing stage using a air floatation platform with linear motors for rapid macro motion, and a fine focusing stage using piezoceramic actuators for high-precision micro motion. This segmentation allows each stage to optimize for its specific function, achieving overall high-speed high-precision focusing while maintaining manageable system complexity through modular design.
Solution Approach 2:
The patent implements a dynamic two-stage focusing system where the coarse focusing and fine focusing stages can operate independently or cooperatively. The system can switch between different focusing modes (macro-motion focusing and micro-motion focusing) based on operational requirements, providing flexible adaptation to different imaging scenarios while maintaining high performance.
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 enables large-scale, high-speed, high-precision, and high-stability focusing, significantly improving the precision and efficiency of industrial measurements by combining aerostatic air flotation, linear motors, and piezoceramic actuators with flexure hinges for both macro and micro-motion focusing.
Implementation Method 1
a macro-to-micro two-stage camera lens focusing device based on a direct-drive air floatation platform
Implementation Method 2
a z-direction piezoceramic actuator, fixedly disposed in the z-direction micro-motion flexure hinge; a top portion of the z-direction piezoceramic actuator being configured to push the z-direction micro-motion flexure hinge to perform nanoscale motion through a piezoelectric effect
Implementation Method 3
each of the z-direction micro-motion focusing system and the y-direction micro-motion focusing system adopting a structure combining rigid arms and flexible arms
Data Source
AI summary
A macro-to-micro two-stage camera lens focusing device based on a direct-drive air floatation platform includes: a two-stage motion device with macro-motion and micro-motion focusing systems. The focusing device includes: a z-direction macro-motion system, a z-direction micro-motion focusing system, and a y-direction micro-motion focusing system. The macro-motion system includes flat-plate linear motors, a tubular linear motor, a tubular elastic balancing device, and an aerostatic air flotation platform; and the micro-motion focusing system includes a micro-motion platform base, piezoceramic actuators, micro-motion flexure hinges, a micro-motion platform, and an industrial camera lens. The focusing device realizes macro-to-micro two-stage focusing, captures a target through rapid motion of the aerostatic air flotation platform and the linear motors to perform coarse focusing, completes the micro-motion focusing by the piezoceramic actuators and the flexure hinges, realizes large-scale, high-speed, high-acceleration, high-precision, and high-stability focusing of two-stage focusing technology, and improves precision and efficiency of industrial measurement.