Transfer Arm Temperature Control for Substrate Positioning Accuracy
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Solution Overview
Problem
The accuracy of substrate transfer in semiconductor and flat panel manufacturing is compromised due to temperature variations between the warm-up and cool-down states of the transfer arm, leading to deviations in the transfer position and non-uniform processing results.
Innovation Solution
A substrate transfer apparatus with a heating unit and temperature detection system that maintains the transfer arm at a preset temperature range before and during substrate transfer, ensuring consistent performance regardless of the arm's temperature state, and includes a thermostat to prevent overheating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the transfer arm is operated for a long period of time, then the temperature of the transfer arm increases (warm-up state), but the stop position of the transfer arm deviates from the cool-down state by a sub millimeter
Solution Approach 1:
The patent applies parameter changes by heating the arm portion to maintain it at a predetermined temperature, thereby changing the thermal state parameter from variable (cool-down/warm-up fluctuation) to controlled (stable predetermined temperature). This resolves the contradiction by ensuring that regardless of operation duration, the arm portion maintains consistent temperature and thus consistent stop position accuracy.
Solution Approach 2:
The patent implements preliminary action by heating the arm portion before substrate transfer operations begin. The temperature control unit heats the arm portion in advance to reach the predetermined temperature, ensuring that when transfer operations start, the arm portion is already in the optimal thermal state, preventing position deviation that would occur in cool-down state.
2Reliability
If a warm-up operation is performed by operating the transfer arm without processing the wafer, then the transfer arm reaches warm-up state, but the operation rate of the apparatus is greatly reduced
Solution Approach 1:
The patent performs preliminary heating of the arm portion independently of wafer processing operations. The temperature control unit heats the arm portion to predetermined temperature before any substrate transfer begins, so that when production starts, the arm is already in optimal condition. This eliminates the need for time-consuming warm-up operations during production cycles.
Solution Approach 2:
The patent replaces the conventional mechanical warm-up method (operating the transfer arm repeatedly without wafers) with a thermal field method (direct heating of the arm portion). Instead of using mechanical motion to generate heat through friction, the system directly applies thermal energy to the arm portion, achieving temperature stabilization without requiring extensive operational cycling.
3Loss of time
If the transfer arm is operated in cool-down state immediately after resumption, then the operation can resume quickly, but the stop position deviates from the warm-up state
Solution Approach 1:
The patent implements preliminary heating of the arm portion before allowing substrate transfer operations to resume. When the apparatus is restarted after maintenance or shutdown, the temperature control unit automatically heats the arm portion to the predetermined temperature before transfer operations begin, ensuring position accuracy without requiring extended operational warm-up.
Solution Approach 2:
The patent replaces the conventional approach of resuming operations immediately in cool-down state with direct thermal heating of the arm portion. This substitution allows the system to achieve optimal operational temperature quickly through direct heating rather than relying on prolonged mechanical operation to generate heat, thus maintaining precision while enabling rapid resumption.
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 solution allows for precise and uniform substrate transfer immediately after resumed operation, maintaining high accuracy and reducing processing non-uniformity by stabilizing the transfer arm's temperature within a set range.
Implementation Method 1
a heating unit for heating the arm portion; a temperature detection unit for detecting a temperature of the arm portion; and a control unit for heating the arm portion by the heating unit prior to a start of a transfer of the substrate
Data Source
AI summary
Disclosed is a substrate transfer apparatus including a transfer arm of a joint type having an arm portion rotatably connected with a holding portion for holding a substrate, the apparatus including: a heating unit for heating the arm portion; a temperature detection unit for detecting a temperature of the arm portion; and a control unit for heating the arm portion by the heating unit prior to a start of a transfer of the substrate, allowing the transfer of the substrate after a temperature detection value obtained by the temperature detection unit reaches a preset temperature range, and then controlling the heating unit so as to maintain the temperature detection value within the preset temperature range.