Patent · US Expired

Retrofocus type super wide angle lens system

US4436382A · kind A · utility

0Cited by

3References

7Claims

0Family size

Assignee

Olympus Optical Co., Ltd. · JP

Inventors

Kazuo Ikari · Tokyo, JP
Toru Fujii · Chiba, JP

Key dates

Filing date	Oct 30, 1981
Grant date	Mar 13, 1984
Priority date	—
Expiry date	Oct 30, 2001

Classification

Technology area (CPC G)Physics
CPC primaryG02B13/04
WIPO fieldOptics
WIPO sectorInstruments

Abstract

Retro-focus type super wide angle lens system comprising a first positive meniscus lens component having the convex surface on the object side, a second negative meniscus lens component having the convex surface on the object side, a third negative meniscus lens component having the convex surface on the object side, a fourth positive lens component, a fifth negative meniscus lens component, a sixth positive cemented lens component, a seventh negative cemented lens component, an eighth positive meniscus lens component having the convex surface on the object side, a ninth positive lens component, and a filter disposed between the fifth and sixth lens components. In this lens system, aberrations are well corrected.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.