Patent Number:
6,295,166
Title:
Projection lens for projection type of television system
Abstract:
A projection lens for a projection type of television system which comprises a positive power first lens having a convex surface on the image side, a positive power second lens having a convex surface on the image side, third biconcave lens, a positive power fourth meniscus lens having a convex surface on the object side and a positive power fifth lens having a convex surface on the image side arranged in order from the image side to the object side satisfies the following conditions: where F.sub.12 is the composite focal length of the first and second lens elements, F.sub.3 is the focal length of the third lens element, F.sub.5 is the focal length of the fifth lens element, F is the focal length of the projection lens, and BF is the back focal distance of the projection lens.
Inventors:
Yamamoto; Chikara (Saitama, JP)
Assignee:
Fuji Photo Optical Co., Ltd.
International Classification:
G02B 13/16 (20060101); H04N 5/74 (20060101); G02B 003/00 (); G02B 009/00 ()
Expiration Date:
09/25/2018