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Verfügbare Sprachen
=,
VL-C780S/H/X
VL-C7400E
VL-C690S/H/x
VL-C6400E
Figure 6-2 (g). Fluorescence Detection Area
2. White balance control section
White balance correction is controlled by means of the preset potential given from the outside. Each preset
value of R-Y and B-Y is given as follows:
PRESET
B-Y
R-Y¥
H
High colour temperature
pin(17)
pin (13)
M
Reference colour temperature
pin(18)
= pin (12).
L
Low colour temperature
pin(19)
pin {11)
As shown in Fig. 6-2 (h), the internal preset reference values are set by dividing the portion between M and
H into seven in the inside.
.
There are eight sets of internal preset values corresponding to the internal preset reference values. The
white balance control voltage becomes the integral of the time division signal of the internal preset values.
For example, when the white balance control voltage is between H4 dand H5, PRS is selected and the white
balance control voltage becomes the integral of the time division signal of the values h and | of PRS.
When the white balance is kept at a certain colour temperature, a set of internal preset values (Fig. 6-2 (h))
is selected and the duty is set so that the optimum white balance contro! voltage is provided to make the
colour difference average get nearest to the white level.
.
if the colour temperature changes, the duty also changes to perform white balance correction.
However,
the range of colour temperature change is limited according to which white balance correction can be
performed by the duty change within a set of internal preset values. Therefore, when. the colour
temperature changes greatly, value h or | is constantly outputted without being. able to. perform white
balance correction. Shifting to the next internal preset value is performed by comparing the white balance
voltage with the internal preset reference value.
The shifting is made only when the colour average
exceeds the start setting value.
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