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:
Oct. 29, 2007
Filed:
Feb. 12, 2004
Yuji Miyauchi, Hachioji, JP;
Yuji Miyauchi, Hachioji, JP;
Olympus Corporation, Tokyo, JP;
Abstract
The invention provides a zoom lens system much more reduced in size and cost than ever before and best-suited for use on portable information terminals of small size. The zoom lens system comprises, in order from an object side thereof, a first lens group Ghaving positive refracting power and designed to be fixed during zooming, a second lens group Ghaving negative refracting power and designed to move from the object side to an image plane side of the system for zooming from a wide-angle end to a telephoto end of the system, a third lens group having refracting power and designed to move from the image plane side to the object side for zooming from the wide-angle end to the telephoto end, and a fourth lens group Ghaving positive refracting power and designed to be movable during zooming. Condition (1) with respect to the power of the third lens group Gcondition (2) with respect to the amount of zooming movement of the third lens group Gor condition (3) with respect to the composite power of the third and fourth lens groups Gand Gand condition (10) with respect to the actual value of the back focus are satisfied.