US Patent 7164540 Zoom lens system

Patent 7164540 was granted and assigned to Pentax on January, 2007 by the United States Patent and Trademark Office.

Overview Structured Data Issues Contributors Activity

Is a

Patent

Patent attributes

Current Assignee

Pentax

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

71645400

Patent Inventor Names

Takashi Enomoto0

Date of Patent

January 16, 2007

Patent Application Number

110814970

Date Filed

March 17, 2005

Patent Primary Examiner

Scott Walker

Patent abstract

A zoom lens system includes ‘n’ (n≧3) lens groups. A first lens group that is the most object-side lens group of said zoom lens system has a positive refractive power, and a final lens group that is the most image-side lens group of the zoom lens system has a negative refractive power. The distance from the most object-side surface of the positive first lens group to the most image-side surface of the negative final lens group becomes shortest at an intermediate focal length between the short focal length extremity and the long focal length extremity.