Method and apparatus for detecting foreign material on a chuck
First Claim
1. An apparatus comprising:
- a chuck having a top surface and configured to clamp a substrate to said top surface, said chuck having one or more recessed regions in said top surface, said recessed regions configured to allow a cooling gas to contact a backside of said substrate;
a cooling gas inlet and a cooling gas outlet connected to said one or more recessed regions;
a first measurement device connected to said cooling gas inlet and configured to measure a first amount of cooling gas entering said cooling gas inlet;
a second measurement device connected to said cooling gas outlet and configured to measure a second amount of cooling gas exiting from said cooling gas outlet; and
a controller configured to determine a difference between said first amount of cooling gas and said second amount of cooling gas,wherein said cooling gas comprises helium, neon, argon, or nitrogen.
8 Assignments
0 Petitions
Accused Products
Abstract
An apparatus and method for leak detection of coolant gas from a chuck. The apparatus includes a chuck having a top surface and configured to clamp a substrate to the top surface, the chuck having one or more recessed regions in the top surface, the recessed regions configured to allow a cooling gas to contact a backside of the substrate; a cooling gas inlet and a cooling gas outlet connected to the one or more recessed regions; a first measurement device connected to the cooling gas inlet and configured to measure a first amount of cooling gas entering the cooling gas inlet and a second measurement device connected to the cooling gas outlet and configured to measure a second amount of cooling gas exiting from the cooling gas outlet; and a controller configured to determine a difference between the first amount of cooling gas and the second amount of cooling gas.
17 Citations
18 Claims
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1. An apparatus comprising:
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a chuck having a top surface and configured to clamp a substrate to said top surface, said chuck having one or more recessed regions in said top surface, said recessed regions configured to allow a cooling gas to contact a backside of said substrate; a cooling gas inlet and a cooling gas outlet connected to said one or more recessed regions; a first measurement device connected to said cooling gas inlet and configured to measure a first amount of cooling gas entering said cooling gas inlet; a second measurement device connected to said cooling gas outlet and configured to measure a second amount of cooling gas exiting from said cooling gas outlet; and a controller configured to determine a difference between said first amount of cooling gas and said second amount of cooling gas, wherein said cooling gas comprises helium, neon, argon, or nitrogen. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method comprising:
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providing a chuck having a top surface and configured to clamp a substrate to said top surface, said chuck having one or more recessed regions in said top surface, said recessed regions configured to allow a cooling gas to contact a backside of said substrate, said chuck including a cooling gas inlet and a cooling gas outlet connected to said one or more recessed regions; supplying cooling gas to said cooling gas inlet and exhausting said cooling gas from said cooling gas outlet; measuring a first amount of cooling gas entering said cooling gas inlet; measuring a second amount of cooling gas exiting from said cooling gas outlet; and determining a difference between said first amount of cooling gas and said second amount of cooling gas, wherein said cooling gas comprises helium, neon, argon, or nitrogen. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification