YSD_Users_E.pdf - 第246页
5-57 5 Creating the board data E, F: Search Area XY As a general guide, set this parameter to the mark diameter plus 3mm. F or example, when the mark diameter is 1 mm, set this parameter to “4mm” as sho wn below . If oth…
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Creating the board data
6.4 Vision parameters
Vision parameters
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A: Surface Type
This specifies the bright and dark relation between the mark surface and board (surrounding area). Refer to the table
below.
Shape Type
Board is brighter than mark.
Shape Type
Mark is brighter than Board.
Shape Type
Brightness comparison
Image
Board
Mark
Board
Mark
Surface Type settings
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B: Algorithm Type
There are 6 algorithm types selectable for mark recognition.
• Normal
In typical recognition, all types of marks should be set to “Normal”. Try setting to other parameters if the mark cannot
be recognized with the “Normal” setting.
• Special 1
Select this if the mark cannot be recognized by the “Normal” setting.
• Special 2
Select this if the mark which cannot be recognized by the “Normal” setting has a cutout area.
• PTRN Outline, PTRN GrayLev, PTRN Whole
Select these parameters when the Shape Type parameter is set to “Pattern”. For more details, refer to “5.6. Pattern
matching” in this chapter.
C: Mark Threshold
This is the threshold level for binary image used to recognize the mark. An optimum threshold level can be found in the
Mark Adjust mode explained later in this section.
D: Tolerance
This specifies a tolerance percentage for the mark size when the mark is recognized with the vision system. (Typically
this should be set to “30”.)
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E, F: Search Area XY
As a general guide, set this parameter to the mark diameter plus 3mm. For example, when the mark diameter is 1 mm, set
this parameter to “4mm” as shown below. If other marks (such as resist, silk print, other patterns) exist in this search area,
make the Search Area setting smaller.
1
4
Search Area
Mark
Board
Search Area
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TIP
The Search Area parameter is not displayed on the Vision tab screen when "Mark Type" of the Basic parameters is set
to "Badmark".
G to K: Light level
Lighting for recognizing a mark is divided into several zones. Light level in each zone is displayed here. Optimum light
levels can be found in the Mark Adjust mode explained later.
L, M: Cut Outer Noise, Cut Inner Noise
Values used to eliminate the areas that appear as a noise outside or inside the mark when the mark image is digitized.
Obtain the optimum values using the Mark Adjust mode that is explained in the next section, and enter the obtained
values.
N: Sequence
Set to "Normal" in most cases. If the recognition speed is important select "Quick", or if recognition accuracy is important
select "Fine".
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6.5 Mark Adjust mode
This operation checks whether the parameter settings are correct. For parameters which are unspecified, the
optimal values can be obtained by performing “VISION TEST” here. The following adjustment procedure is
explained for cases where “Mark Type” of the Basic parameters is set to “Fiducial”.
1
Select the mark data.
Open the mark information screen and line up the cursor with the mark data you want to check.
2
Press the [Mark Adj] button to enter the Mark Adjust mode.
The Mark Adjust window appears as shown below.
Mark Adjust window
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3
Set the board on the conveyor and clamp it.
n
NOTE
Before clamping the board on the conveyor, you must adjust each conveyor unit. For the conveyor unit adjustment,
see "3.3 Changing the conveyor unit setup" in Chapter 2.
4
Perform teaching for the mark.
1. Press the [Move Head] button to open the Move Head window.
2. Use the arrow buttons to position the moving camera above the mark so the mark is aligned with the
cross cursor on the vision monitor as shown in the table below.
3. Press the [Close] button to return to the Mark Adjust window.
Shape Type Teaching point Example
Circle, Square
Triangle, Sp. Shape
Corner
Center of mark
Corner of mark
Mark teaching positions
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