Optics: measuring and testing – By shade or color – Tristimulus examination
Patent
1994-02-22
1994-12-13
Evans, F. L.
Optics: measuring and testing
By shade or color
Tristimulus examination
356406, 356419, G01J 351
Patent
active
053733649
ABSTRACT:
To enable top illumination densitometers to be used for measuring light reflections on colored control fields of so-called printing control strips, it is necessary to center the measuring openings of such instruments accurately on the control field so as to focus properly. For this purpose, there is provided a hand-held instrument which comprises an instrument housing and a measuring head in the housing, the measuring head having an outer wall, defining a measuring aperture facing the measuring plane and containing a source of measuring light and a measuring light receiver arranged to receive light from the source through light guiding channels. The light guiding channels include a tubular light guiding channel portion extending perpendicularly to the measuring plane along the outer wall from the measuring aperture up the measuring head, and the tubular light guiding channel portion having a uniform cross section along the entire height of the measuring head, the cross section not exceeding that of a control field to be measured.
REFERENCES:
patent: 3995958 (1976-12-01), Pfahl et al.
patent: 4003660 (1977-01-01), Christie, Jr. et al.
patent: 4264210 (1981-04-01), Mitsuhashi
patent: 5141323 (1992-08-01), Kipphan et al.
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