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. 12, 1993
Filed:
Feb. 09, 1993
Applicant:
Inventors:
Hung-Te Lee, Taipei, TW;
Yi-Yen Laio, Hsinchu, TW;
Assignee:
Industrial Technology Research Institute, Chutung, TW;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359689 ; 359748 ;
Abstract
A zoom lens system is arranged in three lens groups, in the order from object side to image plane side, that the first lens group has negative refractive power, the second lens group has positive refractive power, and the third lens group has negative refractive power. During zooming operation from wide angle position to telephoto position, the three lens groups vary the separations therebetween and together move toward the object side of the lens system. The first lens group of the lens system is composed of a negative lens element and a positive lens element.