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:
Mar. 07, 2000
Filed:
Feb. 17, 1998
Applicant:
Inventor:
Hee Jong Moon, Seoul, KR;
Assignee:
LG Electronics, Inc., Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ;
U.S. Cl.
CPC ...
359651 ; 359716 ;
Abstract
A projection lens for projecting, on a projection screen, an enlargement of an image appearing on a cathode ray tube (CRT) corrects for optical aberrations by minimizing the number of lens elements, and can be manufactured at low cost. The projection lens includes, successively from an image side to an object side, a first lens group comprising a single lens element of generally positive meniscus shape, a second lens group comprising a single positive lens element, a field stop, and a third lens group having a concave surface facing the image side.