Optical: systems and elements – Lens – Reverse telephoto
Patent
1996-05-23
1997-10-21
Epps, Georgia Y.
Optical: systems and elements
Lens
Reverse telephoto
359715, 359661, 359781, G02B 1304, G02B 302, G02B 2102, G02B 934
Patent
active
056802595
ABSTRACT:
A wide angle lens is constituted by four sheets of concave, concave, convex, and convex lenses successively arranged from the object side so as to satisfy predetermined conditional expressions concerning focal lengths, whereby various kinds of aberration are favorably corrected and, while the cost required for molding each lens is minimized, a higher brightness can be obtained as compared with the conventional wide angle lens. From the object side, first, second, third, and fourth lenses (L.sub.1 to L.sub.4) are successively disposed. Each of the first lens (L.sub.1) and second lens (L.sub.2) is made of a negative meniscus lens whose concave surface with a stronger curvature is directed toward the imaging surface (1), while each of the third lens (L.sub.3) and the fourth lens (L.sub.4) is made of a biconvex lens whose surface with a stronger curvature is directed toward the imaging surface (1), such that f.sub.2 /f.sub.1 is 0.888 thereby satisfying a conditional expression of 0.8<f.sub.2 /f.sub.1 <1.2 and that f4/f3 is 1.103 thereby satisfying a conditional expression of 0.8<f.sub.4 /f.sub.3 <1.2.
REFERENCES:
patent: 2824495 (1958-02-01), Klemt
patent: 3230826 (1966-01-01), Bednarz
patent: 3331652 (1967-07-01), Shelley
patent: 3497291 (1970-02-01), Woltche
patent: 3512874 (1970-05-01), Woltche
patent: 3524697 (1970-08-01), Isshiki et al.
patent: 3549241 (1970-12-01), Mori
patent: 3567310 (1971-03-01), Bertele
patent: 3601473 (1971-08-01), Mandler et al.
patent: 3734600 (1973-05-01), Shimizu
patent: 3799655 (1974-03-01), Laikin
patent: 3874770 (1975-04-01), Shimizu
patent: 4412726 (1983-11-01), Horimoto
patent: 4487485 (1984-12-01), Hisada
patent: 5477389 (1995-12-01), Ito et al.
Epps Georgia Y.
Fuji Photo Optical Co., Ltd.
Lester Evelyn A.
Snider Ronald R.
LandOfFree
Wide angle lens does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wide angle lens, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wide angle lens will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1011488