Head Positioning Assembly Segregating Actuation Frequencies
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing head positioning systems for communication with media face challenges in precise and cost-effective positioning, particularly in isolating high-frequency vibrations and requiring separate actuators or motors for coarse and fine adjustments.
Innovation Solution
A head positioning assembly comprising a first and second carriage assembly, flexible members, and an actuator, where the flexible members segregate actuation frequencies between the assemblies, allowing independent movement and reducing the need for separate actuators or motors by utilizing bearing and flexure-based adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate actuators or motors are used for coarse and fine adjustments, then positioning precision is improved, but device complexity increases
Solution Approach 1:
The positioning system is segmented into two carriage assemblies: a first carriage assembly for coarse positioning and a second carriage assembly for fine positioning. Each carriage assembly can be independently actuated, allowing separate control of coarse and fine adjustments without requiring separate actuators for each function, thus reducing overall device complexity while maintaining positioning precision.
Solution Approach 2:
The flexible members serve multiple functions: they couple the carriage assemblies mechanically while also providing vibration isolation and frequency segregation. This multi-functionality reduces the need for additional separate actuators or motors, addressing the complexity issue while maintaining the precision benefits of multi-stage positioning.
2Measurement precision
If high frequency actuation is provided, then fine adjustment capability is improved, but vibration and resonance increase
Solution Approach 1:
Flexible members act as intermediaries between the actuator and the carriage assemblies. These flexible members isolate high-frequency vibrations and prevent them from propagating to the first carriage assembly, while still allowing the second carriage assembly to respond to high-frequency actuation for fine adjustments. This mediator approach reduces harmful vibrations while preserving fine adjustment capability.
Solution Approach 2:
The use of flexible members (flexures) provides vibration isolation and frequency segregation. The flexibility of these members allows them to decouple high-frequency actuation effects from the coarser first carriage assembly while transmitting the necessary motion to the second carriage assembly for fine positioning, thereby reducing resonance and vibration.
3Stability of the object's composition
If rigid coupling is used between carriage assemblies, then structural stability is improved, but vibration isolation deteriorates
Solution Approach 1:
Flexible members are used to couple the first and second carriage assemblies. These flexible members provide sufficient structural stability to maintain the mechanical connection while simultaneously isolating high-frequency vibrations and providing frequency segregation. This allows the system to maintain stability without suffering from poor vibration isolation.
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 precise and cost-effective positioning with reduced complexity, improved reliability, and simultaneous coarse and fine adjustments, while minimizing out-of-plane resonances and rotational movements.
Implementation Method 1
The first flexible member inhibits movement of the first carriage assembly from high frequency actuation provided by the actuator
Implementation Method 2
The first and second flexible members are spaced apart from each other and extend from first carriage assembly to the second carriage assembly. The first and second flexible members permit the second carriage assembly to move independent of the first carriage assembly.
Data Source
AI summary
A head positioning assembly having a first carriage assembly, a second carriage assembly, and an actuator. The second carriage assembly has a head and is coupled to the first carriage assembly by a first flexible member. The first and second carriage assemblies may be actuated to position the head when sufficient force is provided by the actuator.