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. 14, 2000
Filed:
Jul. 28, 1999
Applicant:
Inventors:
Syuji Narimatsu, Nagano, JP;
Jeffrey A Gohman, Hillsboro, OR (US);
Assignees:
Nittoh Kogaku K.K., , JP;
In Focus Systems, Inc., Wilsonville, OR (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02C / ;
U.S. Cl.
CPC ...
359691 ;
Abstract
A projection zoom lens system of the present invention for projecting image onto a screen from a light modulator such as a DMD includes a first lens group having a negative refractive power and a second lens group having a positive refractive power arranged in this order from the screen side. An outer diameter LD of the last lens and a back focus at the wide-angle end Bfw of the projection zoom lens system satisfy the condition below.