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:
Aug. 16, 2016
Filed:
May. 12, 2015
Tokyo Electron Limited, Tokyo, JP;
Shin Hirotsu, Miyagi, JP;
Yoshiki Igarashi, Miyagi, JP;
Tomonori Miwa, Miyagi, JP;
Hiroshi Okada, Miyagi, JP;
TOKYO ELECTRON LIMITED, Tokyo, JP;
Abstract
Disclosed is an etching method for etching an etching target layer. The etching method includes: a first step of depositing a plasma reaction product on a mask layer made of an organic film formed on the etching target layer; and after the first step, a second step of etching the etching target layer. The mask layer includes a coarse region in which a plurality of openings are formed, and a dense region surrounding the coarse region. The mask layer exists more densely in the dense region than in the coarse region. The coarse region includes a first region and a second region positioned close to the dense region compared to the first region. In the second step of the etching method, a width of the openings in the first region becomes narrower than a width of the openings in the second region.