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:
Jul. 20, 2010
Filed:
Jun. 25, 2008
Noriyuki Iyama, Hachioji, JP;
Noriyuki Iyama, Hachioji, JP;
Olympus Imaging Corp., Tokyo, JP;
Abstract
An imaging optical system includes in order from an object side thereof: a front lens unit having a negative refracting power, an aperture stop, and a rear lens unit having a positive refracting power. The front lens unit includes in order from the object side, a first lens having a negative refracting power. The rear lens unit includes in order from the object side, a second lens which is a positive lens, a third lens which is a negative lens, and a fourth lens which is a positive lens. The imaging optical system satisfies conditional expressions (1) and (2): 1.6<|f|/F<5 . . . (1); 1.2<f/F<5 . . . (2); where Fdenotes a focal length of the overall imaging optical system, fdenotes a focal length of the front lens unit, and fdenotes a focal length of the rear lens unit.