Patent · US Expired

Device for exposure metering

US5907727A · kind A · utility

0Cited by

4References

22Claims

0Family size

Assignee

Leica Camera AG · DE

Inventors

Walter Bletz · Solms, DE
Robert Denk · Grafing, DE
Gerhard Kranz · Wetzlar, DE
Rolf Magel · Reiskirchen, DE

Key dates

Filing date	Aug 20, 1997
Grant date	May 25, 1999
Priority date	—
Expiry date	Aug 20, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG03B7/09971
WIPO fieldOptics
WIPO sectorInstruments

Abstract

A device for exposure metering in photographic cameras including a reflector located in the imaging beam path. The surface of the reflector is provided with a reflecting structure whose size corresponds at least approximately to that of the image recording format. At least one photoelectric receiver records the light intensity of a portion of the image reflected from the reflecting structure. The reflector is pivotally mounted in the camera housing such that during exposure metering the reflector surface is in the vicinity of the film plane of the camera. A limited portion of the reflector is transparent and a photoelectric receiver is set into the backside of the reflector behind the transparent portion.

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