Patent · US Expired

Determination of extreme density values of photographic originals

US4082465A · kind A · utility

6Cited by

4References

7Claims

0Family size

Assignee

AGFA-Gervaert AG · DE

Inventors

Horst Bickl · Pullach, DE
Helmut Treiber · Munich, DE
Gunter Findeis · Sauerlach, DE
Bernhard Knor · Munich, DE
Bernd Payrhammer · Munich, DE
Berthold Fergg

Key dates

Filing date	Apr 22, 1977
Grant date	Apr 4, 1978
Priority date	—
Expiry date	Apr 22, 1997

Classification

Technology area (CPC G)Physics
CPC primaryG01N21/5911
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

Each original in a strip of such originals is scanned during longitudinal travel of the strip using a scanning spot which repeatedly traverses a stationary scan line extending transverse to the direction of strip travel. The scanning spot has a scanning speed such that the scanning spot travels from one to the other end of the stationary scan line in a time less than the time in which the strip travels a distance equal to the breadth of the scan line. The scanning spot which repeatedly traverses the scan line is generated using a light shield having a slit which delimits the scan line and a rotating disk having equiangularly spaced apertures which move through a stationary light beam passing through the moving strip of originals.

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