Satellite Optical Adjustment Flexure With Cam-Driven Focus Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing optical telescopes face challenges in achieving high resolution while being cost-effective and resistant to thermal and environmental shifts, with lead screw driven mechanisms consuming significant space and bar linkage systems being costly to manufacture.
Innovation Solution
An optical adjustment device featuring a monolithic adjustment flexure with cam followers and a drive cam, integrated with a drive shaft and electrically controllable lock, allowing precise focus adjustment and environmental compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a lead screw driven mechanism is used for optical adjustment, then high mechanical advantage and modularity are achieved, but system weight and space consumption increase significantly
Solution Approach 1:
The patent replaces the traditional lead screw mechanical system with a cam-follower mechanism. The cam profile is designed to provide the necessary mechanical advantage for focus adjustment while maintaining a compact form factor. The follower rides on the cam surface, converting rotational cam motion into linear displacement of the focus mirror with high mechanical efficiency and reduced mass compared to lead screw assemblies.
Solution Approach 2:
The invention transitions from the linear threading geometry of a lead screw to the rotational surface geometry of a cam. By designing the cam profile in two dimensions (radial and tangential directions), the system achieves the same functional outcome with significantly reduced space requirements and weight, as the cam can be a thin-walled structure rather than a bulky threaded assembly.
2Ease of operation
If a lead screw driven mechanism is used for optical adjustment, then high mechanical advantage is achieved, but device complexity and space requirements increase
Solution Approach 1:
The patent combines multiple functions into the single cam component: the cam profile simultaneously provides mechanical advantage, defines the range of motion, controls the adjustment speed profile, and ensures precise positioning. This consolidation eliminates the need for separate lead screw, nut, and mounting structure components, thereby reducing overall device complexity while maintaining operational effectiveness.
3Measurement precision
If a bar linkage system with multiple flexures is used for optical adjustment, then focus adjustment capability is achieved, but manufacturing cost increases due to high number of parts requiring precise alignment
Solution Approach 1:
The invention segments the adjustment mechanism into only two critical components: the cam and the follower. This minimal segmentation maintains the necessary degrees of freedom for focus adjustment while eliminating the need for multiple flexures and linkages. The reduced part count directly lowers manufacturing cost and simplifies assembly, as fewer parts require precision alignment and shimming during manufacturing.
4Ease of manufacture
If no optical adjustment device is used, then manufacturing cost is reduced, but optical resolution deteriorates due to focus shift from thermal extremes
Solution Approach 1:
The patent employs a cam profile specifically designed to compensate for thermal expansion and contraction effects. As temperature varies, the cam-follower mechanism automatically adjusts the focus mirror position along the optical axis, maintaining optimal focus despite thermal extremes. This passive compensation through geometric design achieves high optical resolution without requiring active sensors or complex control systems, keeping manufacturing costs low.
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 a lightweight, cost-effective, and efficient mechanism for maintaining optimal focus despite environmental factors, using 3D printing and electrical discharge machining for precise manufacturing.
Implementation Method 1
The adjustment flexure may be moveable between an unflexed neutral position and a flexed first position, and between the unflexed neutral position and a flexed second position
Implementation Method 2
A drive cam may be carried by the rotatable drive shaft. A first cam follower may be operatively coupled between the drive cam and the adjustment flexure to selectively move the adjustment flexure
Data Source
AI summary
A satellite may include an optical component, and an optical adjustment device coupled to the optical component. The optical adjustment device may include a base, and an adjustment flexure carried by the base. The adjustment flexure may be moveable between an unflexed neutral position and a flexed first position, and between the unflexed neutral position and a flexed second position. The optical adjustment device may further include a rotatable drive shaft carried by the base, a drive cam carried by the rotatable drive shaft, a first cam follower and a second cam follower. The cam may cause the first and second cam followers to selectively move the adjustment flexure between the unflexed neutral position and the flexed first flexed position or the second flexed position.