Invention Grant
- Patent Title: System and method for non-contact wafer chucking
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Application No.: US14571000Application Date: 2014-12-15
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Publication No.: US09653338B2Publication Date: 2017-05-16
- Inventor: Luping Huang
- Applicant: KLA-Tencor Corporation
- Applicant Address: US CA Milpitas
- Assignee: KLA-Tencor Corporation
- Current Assignee: KLA-Tencor Corporation
- Current Assignee Address: US CA Milpitas
- Agency: Sulter Swantz pc llo
- Main IPC: G01N21/00
- IPC: G01N21/00 ; H01L21/683 ; G01N21/95 ; H01L21/687 ; G01N21/84

Abstract:
A non-contact wafer chucking apparatus includes a wafer chuck and a gripper assembly coupled to a portion of the wafer chuck. The wafer chuck includes pressurized gas elements configured to generate pressurized gas regions across a surface of the wafer chuck suitable for elevating the wafer above the surface of the wafer chuck. The wafer chuck further includes vacuum elements configured to generate reduced pressure regions across the surface of the wafer chuck having a pressure lower than the pressurized gas regions. The reduced pressure regions are suitable for securing the wafer above the wafer chuck without contact to the wafer chuck. The chucking apparatus includes a rotational drive unit configured to selectively rotate the wafer chuck. The gripper elements are reversibly couplable to an edge portion of the wafer so as to secure the wafer such that the wafer and gripper assembly rotate synchronously with the wafer chuck.
Public/Granted literature
- US20150179495A1 System and Method for Non-Contact Wafer Chucking Public/Granted day:2015-06-25
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