Invention Grant
- Patent Title: Pellicle inspection apparatus
- Patent Title (中): 防护薄膜检查装置
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Application No.: US14683560Application Date: 2015-04-10
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Publication No.: US09588421B2Publication Date: 2017-03-07
- Inventor: Kiwamu Takehisa , Atsushi Tajima , Haruhiko Kusunose
- Applicant: Lasertec Corporation
- Applicant Address: JP
- Assignee: Lasertec Corporation
- Current Assignee: Lasertec Corporation
- Current Assignee Address: JP
- Agency: Faegre Baker Daniels LLP
- Priority: JP2014-082284 20140411
- Main IPC: G03B27/52
- IPC: G03B27/52 ; G03F1/84 ; G03F1/62

Abstract:
Provided with a pellicle inspection apparatus that inspects a pellicle film of a mask provided with a pellicle and used in EUV lithography. The pellicle inspection apparatus includes: an illumination optical system that projects a converging illuminating beam toward the pellicle film;a light collection optical system including an object lens having an optical axis substantially orthogonal to the pellicle film and that collects scattering light outgoing from a foreign substance present on the pellicle film; and a detection system that detects the scattering light collected by the light collection optical system, wherein an incident angle θ2 of the illuminating beam with respect to the pellicle film satisfies Expression θ2−θ0>θ1+23°, where θ0 is a collecting angle (half angle) of the illuminating beam, and θ1 is a maximum light-receiving angle (half angle) of the object lens.
Public/Granted literature
- US20150293460A1 PELLICLE INSPECTION APPARATUS Public/Granted day:2015-10-15
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