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:
Apr. 26, 2005
Filed:
Feb. 04, 2004
Applicant:
Shuji Yoneyama, Saitama, JP;
Inventor:
Shuji Yoneyama, Saitama, JP;
Assignee:
PENTAX Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B015/14 ;
U.S. Cl.
CPC ...
Abstract
A wide-angle zoom lens system includes a negative first lens group, a positive second lens group, a positive third lens group, a negative fourth lens group, and a positive fifth lens group. Upon zooming from the short to the long focal length extremities, the first lens group moves toward the image and thereafter moves toward the object, the distance between the first and second lens group decreases, the distance between the second and third lens groups decreases, the distance between the third and fourth lens groups increases, and the distance between the fourth and fifth lens groups decreases.