Device for measuring ink density on printed surfaces

Details Device for measuring ink density on printed surfaces Device for measuring ink density on printed surfaces

1984-11-05

1987-09-01

Rosenberger, R. A.

Optics: measuring and testing

Of light reflection

356429, 362347, B41F 3300, G01N 2147

Patent

active

046905642

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.

REFERENCES:
patent: 3191026 (1965-06-01), Perret
patent: 4003660 (1977-01-01), Christie et al.
patent: 4252443 (1981-02-01), Lucas et al.
patent: 4422100 (1983-12-01), DuVall et al.
patent: 4456948 (1984-06-01), Brun

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