Patent · US Expired

Device for measuring ink density on printed surfaces

US4690564A · kind A · utility

10Cited by

5References

3Claims

0Family size

Assignee

VEB Kombinat Polygraph Werner Lamberz Leipzig · DE

Inventors

Bernd Morgenstern · Schkeuditz, DE
Helmut Weigend · Leipzig, DE
Peter Reinhardt · San Francisco, US

Key dates

Filing date	Nov 5, 1984
Grant date	Sep 1, 1987
Priority date	—
Expiry date	Nov 5, 2004

Classification

Technology area (CPC G)Physics
CPC primaryG01B11/0616
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A densitometric head for measuring ink density of prints in a running printing machine includes a light source for transmitting light on the measured surfaces and sensors for receiving the remitted light. To simplify the construction and eliminate heat effects of the light source, the latter is arranged in one focal point of an elliptic reflector whereas the measured surfaces are situated in or close to the other focal point where an image light source is formed from the light reflected in the reflector. A heat protective filter is arranged between the two focal points to eliminate heat effects on the sensor.

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