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:
Nov. 11, 2014
Filed:
Aug. 06, 2013
Hirotoshi Nakayama, Isehara, JP;
Masahiro Itoh, Sagamihara, JP;
Hirotoshi Nakayama, Isehara, JP;
Masahiro Itoh, Sagamihara, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A scanner lens includes a first lens group with a positive refractive power, having a first positive lens and a second negative lens which are cemented, second to fifth lens groups having a third negative lens, a fourth positive lens, a fifth negative lens, and a sixth negative lens, respectively, arranged in order from an object side to an image side, and an aperture stop disposed between the first and second lens groups. The scanner lens satisfies the following three conditions:0.01<BF/<0.100.50<1/<9.50.20<10/<0.90where BF is a back focus of the scanner lens, L is a total lens length, f1 is a focal length of e-line of the first lens group, f is a focal length of e-line of the entire lens system and d10 is an air space between the fifth and six lenses.