Sheet Expansion Apparatus with Tension Feedback Control
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Solution Overview
Problem
Existing methods for expanding sheets to create gaps between device chips are inefficient as they require pre-determining expansion distances based on sheet type and properties, leading to tedious and time-consuming processes.
Innovation Solution
An expanding apparatus and method that uses gripping units and tension detecting mechanisms to control the expansion of sheets in multiple directions, allowing for proper expansion without pre-determined distances, using electric motors and tension detectors to adjust movement based on detected tension states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the sheet is expanded by fixed distances in all directions, then the expansion process is simple, but gaps between device chips are insufficient in some directions
Solution Approach 1:
The patent applies dynamic expansion by allowing different expansion distances in different directions based on the sheet's actual tension state and device chip arrangement, rather than using fixed uniform expansion. The expansion distances are adjusted dynamically to ensure sufficient gaps between device chips in all directions.
2Manufacturing precision
If the sheet is expanded sufficiently in one direction, then gaps are created between device chips, but gaps in perpendicular direction may be insufficient
Solution Approach 1:
The patent applies local quality by allowing different expansion distances in different directions (lengthwise vs. breadthwise) based on the specific arrangement and size of device chips in each direction. Each direction is expanded by an amount tailored to its local requirements, ensuring sufficient gaps everywhere.
3Reliability
If the workpiece is stuck to the sheet after slight expansion, then the sheet must be kept taut, but different sheet types require different expansion distances
Solution Approach 1:
The patent applies feedback by using tension detecting means to monitor the sheet's tension state during expansion and automatically adjust the expansion distances accordingly. This eliminates the need to pre-determine expansion distances for different sheet types, as the system self-regulates based on real-time tension feedback.
4Ease of manufacture
If fixed expansion distances are used for different sheet types, then the process is standardized, but it becomes tedious and time-consuming
Solution Approach 1:
The patent applies self-service by enabling the expansion apparatus to automatically determine and adjust expansion distances based on detected sheet properties and tension states, without requiring manual setup or pre-programming for different sheet types. The system serves itself by adapting to each sheet's characteristics in real-time.
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
Enables efficient and proper expansion of sheets without prior knowledge of sheet properties, ensuring adequate gaps between device chips, reducing handling damage and simplifying the process.
Implementation Method 1
detecting the state of the sheet that is under tension in the first directions and the state of the sheet that is under tension in the second directions
Implementation Method 2
the first moving mechanisms may include first electric motors and the second moving mechanisms may include second electric motors
Data Source
AI summary
A method of expanding a sheet includes the steps of gripping the sheet with a first gripping unit and a second griping unit and gripping the sheet with a third gripping unit and a fourth gripping unit, and expanding the sheet by moving the first gripping unit and the second griping unit away from each other in first directions relatively and moving the third gripping unit and the fourth gripping unit away from each other in second directions relatively. In the step of expanding the sheet, the states of the sheet that is under tension are detected, and movement of the first gripping unit, the second griping unit, the third gripping unit, and the fourth gripping unit is controlled based on the detected states of the sheet.