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:
May. 11, 2010
Filed:
Nov. 07, 2008
Applicant:
Takashi Tanaka, Saitama, JP;
Inventor:
Takashi Tanaka, Saitama, JP;
Assignee:
Fujinon Corporation, Saitama-Shi, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 15/14 (2006.01);
U.S. Cl.
CPC ...
Abstract
A fourth lens group of a four-lens group zoom lens includes, in order from an object side, a single positive lens having aspheric surfaces on both sides, and a cemented lens formed of a negative lens and a positive meniscus lens having a convex surface directed to the object side. The object-side surface of the positive single lens is convex and has a stronger refractive power. The cemented lens has a negative refractive power as a whole. The following conditional expressions are satisfied:0.044<0.15()/2<1.53where Da denotes a gap between the single positive lens and the cemented lens,