US 2003/0072002 A1 · Densitometry device

Abstract

The present invention relates to a densitometry device that can perform suitable densitometry with minimum required light amounts and can achieve space savings. An angle θ between a reference optical axis of a light source, which is an LED chip, and an optical axis, according to a photoelectric conversion element, of a density measurement optical system is set to, for example, 52°. Light-emitting chips, which emit each of red, green and blue light, are provided inside a cannon shell-shaped light-emitting portion. These light-emitting chips are arranged in a straight line along a direction of conveyance of a color patch chart. Consequently, inclination angles of the light-emitting chips with respect to a measurement axis of the density measurement optical system will always change consistently with each other, and no difference between the inclination angles of the different colors will occur.

Claims10

Dependent claims

A densitometry device for measuring densities of an object of measurement on which a color image is formed that includes a pattern of different densities for each of colors, the device comprising:

an LED light source that includes an individual package and a plurality of light-emitting chips enclosed in the package for illuminating light of at least two colors onto the object of measurement;
and
a density measurement optical system that photoelectrically converts light that has been at least one of reflected from and transmitted through the object of measurement for obtaining electric signals, such that densities of each of the density patterns can be obtained from the electric signals.

Dependencies are inferred from the claim text.

Densitometry device

Life of this patent

Densitometry device

Life of this patent

Abstract

Claims10