Illumination Optics - Konica Minolta CR-400 Instruction Manual

Illumination Optics

Illumination Optics of the CR-400
The CR-400 is designed in diffusion illumination 0º viewing angle geometry (specular component
included). This illumination method illuminates the specimen from all directions using illuminants
with almost completely equal brightness, and receives the reflected light vertically from the specimen
surface. Normally, when looking at color in, say, a department store or an office, the multiple light
sources and the light reflected from the walls create diffused lighting conditions. Outside these condi-
tions are also diffused, in this case from the sky, so this method creates realistic lighting conditions.
This instrument is therefore very close to normal visual evaluation, and can be used with all types of
specimen.
Illumination Optics of the CR-410
The CR-410 can measure wide range with a diameter of 50mm. It can also take average measurements
of diffused reflected components with little regular reflection, such as cloth and carpets. It is useful
when taking average measurements of relatively wide measurement surfaces, such as fibers, rugs,
carpets, and blankets. As shown in the figure, the light from the pulse xenon lamp is diffused using a
diffusion plate, and the light with is diffused evenly after passing through the diffusion plate illumi-
nates the measurement surface with a large measurement diameter of 50mm. Of all the light which is
reflected from the specimen surface, only that which is reflected vertically from the specimen surface
is led through the specimen measurement fiber to the measuring head sensor, where it is calculated and
displayed in the LCD as the measurement value. Caution is required here as this structure receives a
lot of regular reflected components, so a lot light is received from specimens with flat surfaces, there-
fore greatly affecting the illuminant color.
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