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:
Jun. 30, 1987
Filed:
May. 29, 1986
Applicant:
Inventors:
Masao Kosugi, Yokohama, JP;
Ichiro Kano, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
355 55 ; 355 53 ;
Abstract
A device for adjusting projection magnification of a projection lens usable in a process of manufacture of semiconductor devices to project an image of a pattern of a reticle onto a semiconductor wafer. The device includes at least one plane glass plate to form a substantially closed space at the semiconductor wafer side of the projection lens system. Pressure in the space is controlled to control deformation of the glass plate to thereby adjust the projection magnification.