Disk Chucking Device Using Segmented Holding Elements
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Solution Overview
Problem
Conventional disk chucking devices using C-shaped chucking rings and air chucking systems are complex, lead to non-uniform pressure on the disk, causing strain, deformation, and dust generation, which degrades the reliability of disk inspections and film properties.
Innovation Solution
A disk chucking device that sandwiches the disk from both sides using a guide shaft, a supporting member, a cylindrical holding member, and an elastic member, with balls and a locking mechanism to securely hold the disk without using C-shaped rings or air systems, allowing for reliable high-speed rotation and easy release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a C-shaped chucking ring is used to hold the disk by being fit into the central hole, then the disk can be held, but the structure becomes complex and causes non-uniform pressure on the disk
Solution Approach 1:
The chucking ring is divided into multiple independent chucking elements (first chucking element, second chucking element, etc.) that can move independently. Each element has its own chucking member and biasing mechanism, allowing uniform distribution of holding force across multiple contact points with the disk, thereby reducing structural complexity while maintaining reliable disk holding.
2Ease of operation
If a C-shaped chucking ring with spring is used to spread and close the ring, then the disk can be held and released, but the structure becomes complex and expensive
Solution Approach 1:
The single C-shaped chucking ring is segmented into multiple independent chucking elements, each with its own biasing mechanism. This segmentation allows each element to operate independently, simplifying the overall control mechanism and reducing the complexity of the spring system while maintaining ease of disk holding and releasing operations.
Solution Approach 2:
The complex integrated spring mechanism of the conventional C-shaped chucking ring is extracted and replaced with multiple independent biasing mechanisms for each chucking element. This extraction simplifies the overall structure by eliminating the need for a single complex spring system while maintaining the functionality of holding and releasing the disk.
3Reliability
If the C-shaped chucking ring presses against the central hole of the disk, then the disk can be held, but non-uniform pressure causes strain and deformation of the disk
Solution Approach 1:
The single contact point of the C-shaped chucking ring is segmented into multiple contact points through multiple independent chucking elements. Each element applies force at a different location around the disk perimeter, distributing the total holding force uniformly across multiple points. This uniform distribution prevents concentration of stress at a single point, thereby avoiding strain and deformation of the disk while maintaining adequate holding force.
4Reliability
If the C-shaped chucking ring is used, then the disk can be held, but dust is generated during operation which degrades inspection reliability
Solution Approach 1:
The segmented design with multiple independent chucking elements reduces the friction and wear between the chucking members and the disk surface compared to a single C-shaped ring. The distributed contact points reduce localized friction heat and material transfer, thereby minimizing dust generation while maintaining reliable disk holding capability.
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 device ensures reliable disk holding and rotation without damaging the central hole, reduces dust generation, and maintains inspection reliability by using an elastic force to adjust the holding force, enabling automatic holding and release for efficient disk transport.
Implementation Method 1
an elastic member which biases to separate the plunger and the holding member in the axial direction of the guide shaft, and biases to the holding member toward the vicinity of the central hole at the another surface of the disk
Data Source
AI summary
A disk chucking device includes a guide shaft for insertion into the central hole of a disk. A supporting member at the base side of the guide shaft supports a vicinity of the central hole at one surface of the disk. A cylindrical holding member approaches to or separates from the supporting member. A plunger moves along the holding member. A ball supporting member in the plunger stores a ball. An elastic member is locked by the plunger and the holding member, and biases to separate the plunger and the holding member in the axial direction of the guide shaft. A locking portion of the guide shaft prevents plunger movement in the axial direction of the guide shaft by making contact with the balls. An inside protrusion of the holding member supports the balls by surrounding together with the guide shaft when the balls are contacted with the locking portion.