Patent · US Active

Diaphragm value recognition

US8269882B2 · kind B2 · utility

0Cited by

7References

8Claims

0Family size

Assignee

Leica Camera AG · DE

Inventors

Gerhard Kranz · Wetzlar, DE
Oliver Zielberg · Wetzlar, DE
Ulrich Lies · Wetzlar, DE
Robert Denk · Grafing, DE

Key dates

Filing date	Sep 11, 2007
Grant date	Sep 18, 2012
Priority date	—
Expiry date	Oct 6, 2029

Classification

Technology area (CPC H)Electricity
CPC primaryH04N23/75
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

A method for determining the current camera aperture (working aperture) of lenses on digital cameras having a viewfinder eyepiece and internal exposure measurement through the lens is wherein a further external exposure measurement is carried out past the lens and the value of the working aperture is determined from a reference table stored in the digital camera from the difference ΔBV between the two measured exposure values BV(int) and BV(ext). A digital camera suitable for carrying out the method wherein outside the region covered by the lens tube, the housing of the digital camera has an additional window for a further exposure meter with an upstream optics that is directed onto the subject and serves to restrict the shooting angle, and includes a memory for a reference table for determining the aperture value.

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