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:
Oct. 29, 1991
Filed:
Mar. 12, 1990
Nippon Seiko Kabushiki Kaisha, Tokyo, JP;
Abstract
An optically imaging method and an apparatus therefor are disclosed. The illuminating lens and first imaging lens of an optical lens system comprising the four lenses of first and second illuminating lenses and first and second imaging lenses sandwich a pattern source. Moving the second illuminating lens and first imaging lens in unit with a distance therebetween fixed can image a pattern image at a desired magnification at an image point of the second imaging lens falling within an allowable object space focal depth and produce an illuminant image of an illuminant falling within an allowable entrance pupil position range of a projection lens so that an opening ratio of the illuminant image falls within a predetermined range. An illuminant image of a high contrast and a good telecentricity is produced. In a magnification adjustment of the pattern image, a distance between the second imaging lens and projection lens need not be corrected but the second illuminating lens and first imaging lens may be simply moved in unit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile