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:
Jan. 28, 2003
Filed:
Aug. 30, 2001
Norio Sato, Tokyo, JP;
Shinichiro Ishii, Saitama, JP;
Pentax Corporation, Tokyo, JP;
Abstract
A step zoom lens camera having a zoom lens and a cam ring provided with a cam groove having step portions. The zoom lens camera includes a focusing lens group which serves also as a variable power lens group of the zoom lens; and an adjusting lens group, serving also as another variable power lens group of the zoom lens, which is guided by the cam groove and is moved in the optical axis direction in a non-linear relationship with respect to the rotation angle of the cam ring in each focal length step. The step portions of the cam groove are each provided with a path which enables the adjusting lens group to move so as to provide a linear relationship between the rotation angle of the cam ring and amount of movement of the focal position of an infinite distance object.