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, 2011
Filed:
Oct. 12, 2007
Stephanie Bloch, Rush, NY (US);
Stephanie Bloch, Rush, NY (US);
Quality Vision International, Inc., Rochester, NY (US);
Abstract
This high performance front objective lens system intended primarily for use with a video inspection apparatus has a first lens set in the form of a doublet, with a second lens set intermediate the first lens set and the imaging plane. The second lens set includes a doublet and an adjacent lens. The overall system has an effective focal length of 50 mm, a front focal length of 38.75 mm, and a numerical aperture greater than 0.2. Further, the material of the doublets is chosen to have a small, gradual transition in index between the elements of the lens and the cement, minimizing back reflections and thereby eliminating the need for index matching coatings on the cemented surfaces of the doublets. Finally, the imaging plane of the system matches that of standard ring lights used with video inspection apparatus.