Isolatable Viewport Shutter for Coating Chamber Measurement
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Solution Overview
Problem
Conventional coating processes face issues with viewport buildup, leading to unreliable measurements and requiring shutdown for servicing, which disrupts the process and affects temperature measurements in controlled atmosphere processes like sputtering.
Innovation Solution
A shutter apparatus with a viewport and a second chamber positioned between the viewport and the process chamber, allowing selective isolation and pressure maintenance, enabling line-of-sight measurements without breaching the chamber seal, and facilitating viewport servicing without shutting down the process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the viewport is left exposed to the process chamber, then line of sight measurements can be made continuously, but coating material builds up on the viewport making measurements unreliable
Solution Approach 1:
The system is divided into two separate chambers: the process chamber where coating occurs and the measurement chamber where the viewport is located. A transfer mechanism connects them, allowing the viewport to be selectively exposed to either the process environment or the measurement environment, thus preventing coating buildup while enabling continuous measurements
Solution Approach 2:
A transfer mechanism acts as an intermediary between the process chamber and measurement chamber. This intermediary component controls the exposure of the viewport to coating material by transferring it between chambers, preventing direct contact between the viewport and coating material while maintaining measurement capability
2Ease of repair
If the process chamber is shut down to service the viewport, then the viewport can be cleaned or replaced, but production downtime increases
Solution Approach 1:
By separating the viewport into its own measurement chamber, the system allows independent servicing of the viewport without affecting the process chamber. The viewport can be cleaned, replaced, or maintained in the measurement chamber while the process chamber continues operating, eliminating production downtime
Solution Approach 2:
The transfer mechanism serves as an intermediary that enables the viewport to be moved to the measurement chamber for servicing. This allows maintenance activities to be performed on the viewport without requiring shutdown of the process chamber, maintaining productivity while facilitating easy repair
3Object-affected harmful factors
If a shutter is used to protect the viewport, then coating buildup is reduced, but the chamber seal must be breached to operate the shutter
Solution Approach 1:
The system divides the viewport protection function from the chamber seal by creating separate process and measurement chambers. The viewport resides in the measurement chamber and is protected from coating material through the transfer mechanism, eliminating the need for shutters that would breach the chamber seal
Solution Approach 2:
The transfer mechanism acts as an intermediary that protects the viewport from coating material without requiring shutters within the process chamber. By transferring the viewport between chambers, the system prevents coating buildup while maintaining seal integrity in the process chamber
Data Source
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AI summary
An apparatus, a method of servicing, and a method of measuring a process parameter for a coating process having an isolatable viewport (402) are disclosed. The apparatus includes a viewport (402), a device (404) positioned for selectively isolating the viewport (402) from a process chamber (406), and a second chamber (408) positioned between the viewport (402) and the device (404). The device (404) includes a first position to selectively isolate the viewport (402) from a process chamber (406) and to selectively maintain a predetermined process pressure in the process chamber (406), the device (404) includes a second position to selectively permit line of sight measurement of the process chamber (406) from the viewport (402), and the second chamber (408) maintains the predetermined process pressure in the process chamber (406) when the device (404) is in the second position.