US 4,061,428 AGranted

Scanning color densitometer

AssigneeKonishiroku Photo Industry Co., Ltd.

InventorsTadashi Amano, Masaji Nakamura

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Abstract

This invention relates to a scanning densitometer for obtaining information on the areal distribution of optical density of photographic image by scanning the entire area of an image, comprising plural input optical fiber bundles of which faces are arranged across the image and of which light-emitting faces are arranged on a circle with a predetermined interval. Plural output optical fiber bundles have light-receiving faces arranged so as to respectively face the light-emitting faces and which output faces are arranged so as to respectively face plural photoelectric converting elements. A rotary disc between the light-emitting faces and light-receiving faces is provided with blue, green and red filters arranged on the circle, whereby information of the distribution of photographic density over the entire image area being obtained by measuring the light which passes through said filters of said rotary disc.

Claims8

Dependent claims

A scanning color densitometer for measuring the areal distribution of the photographic densities of blue-light component, green-light component and red-light component separately by optically scanning substantially the entire area of an image, comprising

plural light-conducting members having incident faces arranged across the image being moved and having light-emitting faces arranged on a first circle,
a rotary disc positioned so as to face said light-emitting faces and having at least three windows formed therein on a second circle, said second circle being coaxial to and having substantially the same diameter as that of said first circle,
plural blue, green and red filters mounted in said at least three windows, respectively,
photoelectric converters disposed in optical paths defined by said filters and said light-emitting faces so as to receive the light through said filters from said light-emitting faces,
a first detecting means for detecting the rotational position of said rotary disc and emitting a signal when said filters of a particular color become located in front of said light-emitting faces, and
a second detecting means for detecting the rotational position of said rotary disc and releasing a command for the density measurement when any of said filters of any color become located in front of said light-emitting faces.

3 more elements

Dependencies are inferred from the claim text.