Patent · US Expired

Wide angle photographic lens

US4099850A · kind A · utility

6Cited by
1References
6Claims
0Family size

Assignee

Inventor

Key dates

Filing dateFeb 4, 1977
Grant dateJul 11, 1978
Priority date—
Expiry dateFeb 4, 1997

Classification

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

Abstract

A wide angle photographic lens system comprises, in the order from the object side, a first lens component which is a positive lens having its more convex surface facing the object side, a second lens component which is a negative meniscus lens having its convex surface facing the object side, a third lens component which is a biconvex lens having its more convex surface facing the object side, a diaphragm, a fourth lens component which is a biconcave lens, a fifth lens component which is a positive meniscus lens having its convex surface facing the image side, and a sixth lens component which is a biconvex lens. Four distinctive optical conditions are characteristic of the lens system.

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