The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 2019
Filed:
Dec. 13, 2016
Canon Kabushiki Kaisha, Tokyo, JP;
Ryo Takai, Utsunomiya, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
The present invention provides an exposure apparatus exposing a substrate through a projection optical system, the apparatus comprising a stage configured to hold the substrate, a detection unit configured to emit detection light in a first direction and detect a position of the stage, a blowing unit configured to blow out a gas, and a guide unit including a first portion and a second portion, wherein the first portion is configured to guide the gas to a first space between the projection optical system and the substrate, such that a gas flow along the substrate is formed in the first space, and wherein the second portion is configured to guide the gas to a second space where the detection light passes through, such that a gas flow in a second direction is formed in the second space.