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:
Feb. 06, 2007
Filed:
Jun. 29, 2005
Applicants:
Eijiroh Tada, Saitama, JP;
Takayuki Ito, Saitama, JP;
Inventors:
Eijiroh Tada, Saitama, JP;
Takayuki Ito, Saitama, JP;
Assignee:
PENTAX Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B 9/00 (2006.01); G03B 9/62 (2006.01); G03B 13/06 (2006.01); G03B 9/12 (2006.01);
U.S. Cl.
CPC ...
Abstract
A fisheye lens system with a half angle-of-view of 90° includes a negative front lens group, a diaphragm, and a positive rear lens group. The negative front lens group includes at least three negative meniscus lens elements each of which has the convex surface facing toward the object; and the three negative meniscus lens elements satisfy the following conditions:0.2<SF  (1)0.8<  (2)0.8<  (3)