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. 18, 2014
Filed:
May. 25, 2012
Applicant:
Tsan-haw Lee, Taichung, TW;
Inventor:
Tsan-Haw Lee, Taichung, TW;
Assignee:
Asia Optical Co., Inc., Taichung, TW;
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 13/04 (2006.01); G02B 13/20 (2006.01); H04N 5/225 (2006.01);
U.S. Cl.
CPC ...
G02B 13/20 (2013.01); H04N 5/2254 (2013.01); G02B 13/04 (2013.01);
Abstract
A fixed-focus projection lens has a first lens group and a second lens group in sequence along an optical axis from a screen side to a light modulator side. The first lens group has a positive refractive power, and the second lens group has a positive refractive power. The first lens group has two lenses, and the refractive powers of the lenses are negative and positive. The second lens group has five lenses, and the refractive powers of the lenses respectively are negative, negative, positive, positive, and positive. The fixed-focus projection lens has the features of small size and high optical performance.