Wide-angle lens

Details Wide-angle lens Wide-angle lens

1984-04-05

1986-01-28

Corbin, John K.

G02B 964

Patent

active

045667640

ABSTRACT:
A retro-focus type wide-angle lens having an aperture ratio of 1:2, an angle of view of about .+-.42.degree., and a back focus about 1.5 times the focal length comprises only nine component lenses. The first lens disposed nearest to the object side is a positive meniscus. The second and third lenses are each a negative meniscus. The fourth lens is a positive lens. One of the fifth and sixth lens is a double-convex lens, the other being a positive meniscus. The seventh, eighth, and ninth lenses are a double-concave lens, a positive meniscus, and a double-convex lens, respectively. The sixth and seventh lenses are cemented together. The wide-angle lens satisfies the following conditions:

REFERENCES:
patent: 3832037 (1974-08-01), Nakagawa
patent: 3870400 (1975-03-01), Yamashita et al.
patent: 4145116 (1979-03-01), Ikeda
patent: 4188092 (1980-02-01), Momiyama

Affiliated with

Also associated with

Rating

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.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1303519