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:
May. 20, 1997
Filed:
Nov. 15, 1994
Hironori Shibata, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A zoom lens system comprising, in order from the object side, a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, a third lens unit having a negative refractive power, a stop, a fourth lens unit having a positive refractive power and a fifth lens unit having a positive refractive power; and configured to be zoomed from a wide position to a tele position thereof by moving the second lens unit and the third lens unit so as to widen an airspace reserved therebetween, and moving the third lens unit and the fourth lens unit so as to narrow an airspace reserved therebetween with the first lens unit kept stationary. This zoom lens system has a field angle of 75.degree. at the wide position, a vari-focal ratio as high as 8, a compact size and high imaging performance.