Fiber Positioning Unit Segmentation for Telescope Assembly
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Solution Overview
Problem
Existing Fiber Positioning Units (FPUs) for telescopes face challenges such as reduced system performance due to optical fiber bending, complexity in high-density FPU assembly, and compromised telescope performance due to irreversible assembly processes.
Innovation Solution
The FPU is designed as two separate parts, allowing for independent mounting on the focal plate and maintaining the optical fiber straight, enabling the use of larger motors and reducing the complexity of assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If FPU are designed as single part with integrated motors, then assembly is simplified, but manufacturing precision and reliability are compromised due to irreversible assembly process
Solution Approach 1:
The FPU is divided into separate components: the positioner unit and the motor unit are manufactured independently before final assembly. This segmentation allows each component to be manufactured and tested separately with high precision, then assembled together, avoiding the irreversible assembly process of integrated designs.
Solution Approach 2:
The positioner unit is pre-assembled and pre-tested for positioning performance before final mounting to the focal plate. This preliminary action ensures that positioning precision is verified independently, and only after confirmation does the final irreversible assembly occur, thereby maintaining manufacturing precision.
2Quantity of substance
If FPU diameter is minimized to increase density, then FPU density increases, but system performance is reduced due to motor size constraints
Solution Approach 1:
By separating the motor unit from the positioner unit, the design allows the motor to be positioned at the periphery rather than requiring it to fit within the FPU diameter. This enables use of larger, more powerful motors while maintaining high FPU density on the focal plate.
Solution Approach 2:
The motor is repositioned from a central/inset configuration to a peripheral configuration, utilizing the radial dimension of the FPU structure. This dimensional reorganization allows larger motors to be accommodated without increasing the FPU footprint, thus maintaining high density while improving system performance.
3Device complexity
If optical fiber is bent to pass beside motor, then compact design is achieved, but optical performance is reduced
Solution Approach 1:
The separation of the motor unit from the positioner unit creates distinct pathways for the optical fiber. The fiber can run through dedicated channels in the positioner unit without needing to bend around the motor, maintaining it straight and preserving optical performance while achieving compact design.
4Stability of the object's composition
If rotatable shaft is located in focal plate, then mechanical connection is achieved, but focal plate rigidity is reduced
Solution Approach 1:
The rotatable shaft is relocated from the focal plate to the positioner unit, separating the mechanical connection function from the focal plate structure. This allows the focal plate to maintain its rigidity while the positioner unit provides the necessary mechanical connections through its own integrated shaft and bearing system.
Data Source
AI summary
Fiber positioning unit of SCARA type comprising an alpha (1,2,3) and a beta mechanism (4,5); the alpha mechanism successively comprising a motor (1), a driving shaft (2) and a rotatable shaft (3), the rotation of the rotatable shaft (3) being carried out by the alpha motor (1) via the driving shaft (2); the beta mechanism comprising a motor (4) and a fiber holding element (5) that may be rotated by the beta motor (4); both mechanisms being mechanically connected in a way to allow a rotation of the beta mechanism (4,5) by the rotatable shaft (3); the alpha mechanism (1,2,3) being furthermore adapted to be partially located within a focal plate (6), characterized by the fact that the alpha motor (1) is adapted to be located on one side of the focal plate (6) while the rotatable shaft (3) and the beta mechanism (4,5) are adapted to be located on the other side of the focal plate (6).