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:
Jul. 16, 1996
Filed:
Jan. 24, 1995
Shin-ichi Ito, Yokohama, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
An exposure mask according to the invention comprises a light-transmissive substrate, and mask patterns formed on the light-transmissive substrate, and including transparent phase shift patterns and translucent phase shift patterns, each of the translucent phase shift patterns having a phase difference of at least 180.degree. for exposure light corresponding to an optical path difference between a transparent portion of the light-transmissive substrate and a transparent portion of the transparent phase shift pattern, the transparent phase shift patterns and translucent phase shift patterns overlapping with each other, wherein the mask patterns include pattern groups each having a first region consisting of an exposed portion of the light-transmissive substrate, a second region adjacent to the first region, in which only a corresponding one of the translucent phase shift patterns exists, a third region adjacent to the second region, in which a corresponding one of the transparent phase shift patterns is laminated on the corresponding translucent phase shift pattern, and a fourth region adjacent to the third region, in which only the corresponding transparent phase shift pattern exists.