Patent Number: 6,166,861

Title: Wide-angle eyepiece lens

Abstract: A wide-angle eyepiece lens having an angle of view greater than 60.degree. comprises, in order from the object end, a first lens group including a positive power meniscus lens element with a concave object side surface, an overall negative power second lens group including a doublet comprising, in order from the object side, a negative power lens element and a positive power lens element, and an overall positive power third lens group, and satisfies the following conditions: where f is the overall focal length of the eyepiece lens; f1 is the overall focal length of the first lens group; f2 is the overall focal length of the second lens group; .upsilon.2N is the Abbe number of the negative power lens element of the second lens group; .upsilon.2P is the Abbe number of the positive lens element of the second lens group; R3 is the curvature of radius of the foremost object side surface of the second lens group.

Inventors: Koizumi; Noboru (Saitama, JP)

Assignee: Fuji Photo Optical Co., Ltd.

International Classification: G02B 13/18 (20060101); G02B 25/00 (20060101); G02B 9/12 (20060101); G02B 025/00 (); G02B 013/18 (); G02B 009/34 ()

Expiration Date: 12/26/2017