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:
Mar. 29, 1994
Filed:
Jun. 19, 1992
Applicant:
Inventors:
Assignee:
Kabushiki Kaisha Topcon, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B29D / ;
U.S. Cl.
CPC ...
156 64 ; 29407 ; 29464 ; 29469 ; 264-14 ; 264-17 ; 264 401 ; 359819 ; 359900 ;
Abstract
A method of producing a high-precision lens system, such as a stepper lens, involves the following steps: (a) attaching a metal frame to the radial periphery of each of a plurality of lens elements at a prescribed distance from the optical axis of the element; (b) positioning the periphery of each metal frame at a prescribed radial distance from a reference axis to align the optical axis of each lens element along the reference axis; and (c) securing the individual lens sections together. Adjustment of the eccentricity of the individual lenses is accomplished by measuring the displacement of the lens-frame periphery from the reference axis.