Wide angle lens

US4033675A · kind A · utility

Assignee

• Nippon Kogaku K.K.

Inventors

• Hidenori Terasawa · Kawasaki, JP
• Ikuo Mori · Kawasaki, JP

Key dates

• Filing date: Apr 23, 1976
• Grant date: Jul 5, 1977
• Expiry date: Apr 23, 1996

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B9/60
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

In a wide angle lens system, there are arranged, in succession from the object side toward the image side, a divergent first lens group having its surface of smaller curvature facing the object side, a divergent, meniscus, second lens group having its convex surface facing the object side, the first and second lens groups defining therebetween a divergent, meniscus-shaped air chamber having its convex surface facing the object side, a convergent, meniscus, third lens group consisting of a plurality of lenses, a convergent, meniscus, fourth lens group consisting of a plurality of lenses, and a divergent, meniscus, fifth lens group having its convex surface facing the image side.