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:
Nov. 04, 2008
Filed:
Jul. 21, 2006
Yuko Kobayashi, Hachioji, JP;
Yuko Kobayashi, Hachioji, JP;
Olympus Imaging Corp., Tokyo, JP;
Abstract
The invention is concerned with a small-format yet high-performance zoom optical system with a fewer lenses count, and an electronic system that incorporates it. The zoom optical system comprises, in order from its object side, a first lens unit Gof negative refracting power, a second lens unit Gof positive refracting power and a third lens unit Gof negative refracting power, in which zooming is implemented by movement of at least the second lens unit Gand the third lens unit Gthereby varying a space between adjacent lens units. The negative first lens unit Gis composed of one negative lens, the positive second lens unit Gis composed of one positive lens, and the negative third lens unit Gis composed of one negative lens. The negative lens in the third lens unit Gis in a negative meniscus shape with a concave surface on its image plane side.