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:
Apr. 27, 2004
Filed:
Jan. 10, 2003
PENTAX Corporation, Tokyo, JP;
Abstract
The projection aligner transfers the image of the pattern formed on the mask to the object by scanning a light beam across the mask and the object. The projection aligner includes a driving mechanism for synchronously moving the mask and the object and thereby scanning the light beam across the mask and the object in a predetermined beam scanning direction. The light beam scanning the mask passes through the mask and is projected onto the object by a projection optical system of which magnification is adjusted by a magnification adjusting mechanism. The magnification adjusting mechanism and the driving mechanism are controlled by a controller such that the difference between the magnification of said projection optical system and a velocity ratio of the mask and the object moved by the driving mechanism becomes below a predetermined maximum value which is determined based on a line width of the pattern formed on the mask.