Patent · US Active

Wide-angle photographic objective

US12181644B2 · kind B2 · utility

0Cited by

2References

28Claims

0Family size

Assignee

Leica Camera AG · DE

Inventors

Stefan Roth · Västerås, SE
Kathrin Keller · Waldgirmes, DE

Key dates

Filing date	Dec 17, 2019
Grant date	Dec 31, 2024
Priority date	—
Expiry date	May 3, 2042

Classification

Technology area (CPC G)Physics
CPC primaryG02B9/60
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A wide-angle objective in accordance with the invention comprises, in an order from an object-side end to an image-side end, a front group of total positive refractive power having at least four lenses; a middle group of total positive refractive power having at least three lenses; and a rear group of total positive refractive power having at least three lenses, wherein the quotient of the focal length of the front group and the total focal length of the objective amounts to between 2.28 and 2.79, the quotient of the focal length of the middle group and the total focal length of the objective amounts to between 3.02 and 3.69, and the quotient of the focal length of the rear group and the total focal length of the objective amounts to between 3.50 and 4.29.

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