YSD_Users_E.pdf - 第156页

4-28 4 Making the dispensing stable 4 Set the par ameters For the setting of each nozzle, see “ n Nozzle settings” in “3.1 Using the dispense correction function” in this chapter . Parameter setting Example for T ype 1 1…

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Making the dispensing stable
3.1.7 Setting the calculation type
The dispensed area tends to get smaller when the liquid level in the syringe drops. Setting the calculation type
allows correcting to a more accurate dispensing area. There are two calculation types for making corrections:
proportion type and constant type. Make a graph by measuring the area of each dispensing amount with a
syringe having the liquid level from 10 to 50% and determine the calculation type. This section describes the
procedure for setting the calculation type using a Type 111 nozzle as an example.
1
Set up the head unit.
Prepare a target nozzle and syringe having a 10 to 50% liquid level and attach them to the head. If a
syringe is already attached in the previous section, then expel some liquid from the syringe until the
liquid level becomes 10 to 50%.
n
NOTE
The difference is easier to see when the liquid amount is small, making it easier to set the calculation type.
2
Bleed the nozzle air.
When setting the temperature, bleed the air after waiting until the target temperature is reached. For
the instructions on how to bleed the nozzle air, see “3.6 Bleeding the nozzle air” in Chapter 2.
3
Start the adjustment utility.
1. Press the [Utilities] button.
2. Select “Operator” and press the [OK] button.
3. Press the [Dispense Correction] button.
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Making the dispensing stable
4
Set the parameters
For the setting of each nozzle, see “
n
Nozzle settings” in “3.1 Using the dispense correction function” in
this chapter.
Parameter setting
Example for Type 111 nozzle
Dispensing location
[Auto Input Timer] button
[Execute] button
Type
Head
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n
Example of settings for Type 111 nozzle
Parameter Setting Description
Head Head 1 Select the head to use for dispensing.
Type Type 11 Select the correction number to make settings.
Num. 5 Set the number of measurement points. (5 or more)
Pre. Disp. Num. 5 Set the number of predispensing points. (3 or more)
Mark No. 11 Set the mark No. used for recognition.
Speed 100 Set the speed to “100”.
Use Section 10 Set the number of sections to be corrected. (10 is recommended)
Height Cor. Not used If a non-contact nozzle is used, set this item to “Use”.
Dispensing location Dot station Set the dispensing location.
5
Start measurements.
1. Set the air pressure equal to the pressure for new syringes, and press the [Execute] button. The paper
feed dialog box appears. Check that no dots remain and press the [OK] button.
2. On the [Monitor]-[Vision] screen, check the recognition results and press the [Yes] button while
making a note of the measurement data.
3. Repeat measurements while increasing the timer until the area of the dispensed dots reaches the
maximum area that will be obtained with a new syringe.
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6
Make a graph of the measurement results.
1. Make a graph of the areas measured with a new syringe full of liquid (100%) and a used syringe (50%).
2. Make a graph using the proportion type and constant type values that were obtained from the
following calculation formulas.
• Proportion type
Dispensed area of proportion type correction = 0.1 / 0.3 × Dispensed area obtained when the
remaining amount is 100%
• Constant type
Dispensed area of constant type correction = Dispensed area obtained when the remaining amount
is 100% + (0.1 - 0.3)
The value 0.3 is the dispensed area obtained when the remaining amount is 100% and the dispensing
liquid amount is 20.
The value 0.1 is the dispensed area obtained when the remaining amount is 50% and the dispensing
liquid amount is 20.
For details on the proportion type and constant type, see the descriptions in “
n
Proportion type” and
“
n
Constant type”.
3. Draw the lines by plotting the dispensed areas obtained with proportion type and constant type
corrections applied when the remaining amount is 50% and the dispensing liquid amount is 20. In the
case of this graph, the difference of the constant type is smaller, so use the constant type.
0
0.1
0.2
0.3
0.4
0.5
0.6
0 20 40 60 80
100
Measurement result graph
Example
Dispensing liquid amount [msec]
Dispensed area [mm2]
Difference of constant type
Difference of proportion type
Remaining amount 100%
Remaining amount 50%
Constant type correction
Proportion type correction
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n
NOTE
If it is difficult to select the calculation type within the dispensing liquid amount range specified by dispense correction,
then use the calculation type that shows a smaller difference in the area at the maximum dispensing liquid amount.