Actuator Assembly Bearing Arrangement Axis Constraint
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Solution Overview
Problem
Existing actuator assemblies for optical systems face challenges in preventing unwanted contact between parts due to unrestricted movement along certain axes, which can lead to mechanical interference and inefficiencies.
Innovation Solution
The actuator assembly incorporates a bearing arrangement that constrains movement along specific axes while allowing rotation about others, using SMA wires to provide rotational control and a biasing force to maintain parts in a desired position and orientation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the actuator assembly allows free movement along all axes, then the ease of operation is improved, but mechanical interference and reliability deteriorate due to unwanted contact between parts
Solution Approach 1:
The movement constraints are segmented by axis: the bearing arrangement selectively constrains movement along the third axis while allowing movement along the first and second axes. This segmentation enables independent control of movement freedom and mechanical interference prevention for each axis, resolving the contradiction between ease of operation and reliability.
2Adaptability or versatility
If the drive arrangement provides rotational control about multiple axes, then the adaptability is improved, but the device complexity increases due to additional constraint mechanisms
Solution Approach 1:
The bearing arrangement merges multiple functions into a single mechanism: it constrains movement along the third axis, prevents rotation about the third axis, and allows rotation about the first and second axes. This consolidation achieves comprehensive rotational control and constraint without requiring separate mechanisms for each function, thereby improving adaptability while limiting the increase in device complexity.
3Reliability
If the actuator assembly constrains movement along the third axis, then the reliability is improved by preventing unwanted contact, but the ease of operation deteriorates due to restricted movement
Solution Approach 1:
The constraint is applied locally only along the third axis where unwanted contact occurs, while movement along the first and second axes remains unrestricted. This localized constraint approach prevents unwanted contact and improves reliability without unnecessarily restricting movement in other directions, thereby maintaining ease of operation for legitimate movements.
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
This configuration reduces the risk of mechanical interference by constraining unwanted movement, allowing precise rotational control and maintaining parts in a stable configuration, enhancing the functionality and reliability of optical systems.
Implementation Method 1
drive arrangement which may include a plurality of shape memory alloy (SMA) wires
Data Source
AI summary
An actuator assembly (10) comprises: a first part (1), wherein a first (z) axis is defined with reference to the first part (1) and the extent of the actuator assembly (10) along the first (z) axis is less than the extent of the actuator assembly (10) along any axis perpendicular to the first (z) axis; a second part (2) which is movable relative to the first part (1); a drive arrangement (3) configured to rotate the second part (2) about the first (z) axis and to rotate the second part (2) about a second (x) axis perpendicular to the first (z) axis; and a bearing arrangement (4) configured to allow rotation of the second part (2) about the first (z) and second (x) axes, to constrain rotation of the second part (2) about a third (y) axis, and to constrain movement of the second part (2) along the third (y) axis, wherein the third (y) axis is perpendicular to the first (z) and second (x) axes.