Optics: measuring and testing – By shade or color
Reexamination Certificate
2008-09-11
2011-11-22
Chowdhury, Tarifur (Department: 2886)
Optics: measuring and testing
By shade or color
Reexamination Certificate
active
08064057
ABSTRACT:
A method of color assessment of a sample (10) with respect to a reference illuminant, includes illuminating the sample (10) with a light source (12) that comprises a fluorescent lamp (18) and a plurality of light-emitting diodes (24). The spectrum of the LEDs (24) supplements the spectrum of the fluorescent lamp (18) to reduce deviations between the combined spectrum of the light source (12) and a target spectrum. The target spectrum may be that of the reference illuminant or it may be adjusted to make allowance for known properties of a color assessment cabinet (2) or an observing instrument (16). The LEDs (24) may be arranged so that their light passes through the bulb of the fluorescent lamp (18), which thereby acts as a diffuser. Alternatively, the LEDs (24) and the fluorescent lamp (18) may be located in a housing (31) from which their light can only reach the sample (10) after being mixed by reflection from multiple facets (34).
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Butterworth Michael
Dakin John
Styles Ian
Chernoff Vilhauer & McClung & Stenzel
Chowdhury Tarifur
Nur Abdullahi
Verivide Ltd
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