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. 22, 1977
Filed:
Jan. 12, 1976
Masaki Matsubara, Hachiouji, JA;
Olympus Optical Co., Ltd., Tokyo, JA;
Abstract
An enlarging lens system comprising a front lens group which comprises a first, second, third and fourth lens components and a rear lens group which comprises a fifth, sixth and seventh lens components in which the first and second lens components are positive meniscus lenses, the third lens component is a positive meniscus lens consisting of a single lens or cemented doublet lens, the fourth lens component is a negative meniscus lens consisting of a single lens or cemented doublet lens, the fifth lens component is a negative meniscus lens consisting of a single lens or cemented doublet lens, and the sixth and seventh lens components are positive meniscus lenses, said enlarging lens system satisfying the following conditions. ##EQU1## Said enlarging lens system has the aperture ratio of F/3.5 and field angle of 50.degree. and is arranged so that at image of good quality can be obtained over the whole field.