Mirror Positioning Assembly With Integrated Coarse-Fine Linear Drive
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Solution Overview
Problem
Conventional mirror position adjustment systems for space telescopes face challenges in achieving precise large displacement and fine movement adjustments with a simple structure and control, while also needing to withstand extreme temperature changes and vacuum conditions, and require a reduction in the number of components and weight.
Innovation Solution
A large displacement precision positioning adjustment apparatus with a simple structure and control, featuring linear driving parts that include a linear driver, a rotation driving part, and controllers to adjust the position of the mirror, utilizing non-contact and contact interactions to transmit rotational forces and adjust movement direction and speed, allowing for both large displacement and fine movement capabilities with a reduced component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional driver with separate fine movement part and large displacement movement part is used, then both fine positioning and large displacement capabilities are achieved, but the device complexity and number of components increase
Solution Approach 1:
The patent combines the fine movement function and large displacement function into a single integrated linear driver. The linear driver includes a motor, ball screw, and nut mechanism that work together to provide both coarse positioning (large displacement) and fine positioning (precise movement) capabilities without requiring separate driver units, thereby reducing overall system complexity while maintaining full positioning adaptability
Solution Approach 2:
The linear driver is designed as a multi-functional component that performs both large displacement movement and fine positioning adjustment. By incorporating a ball screw mechanism with a motor, the single driver unit can achieve both coarse positioning during deployment and precise positioning for mirror alignment, eliminating the need for specialized separate drivers for each function
2Measurement precision
If multiple separate components are used for fine movement and large displacement, then positioning precision is improved, but the weight of the apparatus increases
Solution Approach 1:
The patent merges multiple positioning functions into a single linear driver assembly, eliminating the weight of separate fine movement and large displacement drivers. The integrated design includes a motor, ball screw, and nut mechanism that collectively provide both coarse and fine positioning capabilities in one compact unit, significantly reducing the total weight compared to multiple separate components
3Length of moving object
If a tumbler coupling with backlash is used for large displacement movement, then the movement range is increased, but the control complexity increases when target point is exceeded
Solution Approach 1:
The patent replaces the tumbler coupling mechanism with a ball screw-driven linear driver system. The ball screw converts rotational motor motion directly into linear motion of the mirror support, providing large displacement capability without the backlash and control complexity issues of tumbler couplings. The motor can precisely control the linear driver's position in both directions without requiring mechanical reconfiguration
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 and precise adjustment of mirror positions with a lightweight and strong structure, simplifying control and reducing the number of components, while maintaining performance in extreme space environments.
Implementation Method 1
the linear driver includes a motor, a ball screw, and a nut
Implementation Method 2
the linear driver includes a motor, a ball screw, and a nut
Data Source
AI summary
Proposed is a large displacement precision positioning adjustment apparatus including a mirror at an upper end, a fixed plate at a lower portion, linear driving parts including a linear driver performing a large displacement fine operation and a movement supporting part including a guide guiding a movement direction and a fixing part fixing the driver. The linear driver includes a first rotation driving part performing a large displacement movement, a third rotation driving part, a second rotation driving part performing a fine movement, and a moving shaft. The linear driving part includes an upper end connection part connecting an upper end of the linear driving part to the mirror, and a lower end connection part connecting a lower end of the linear driving part and the fixed plate, a first controller controlling a position of the linear driving part, and a second controller controlling a position of the mirror.