M3plus_OperationManual_e - 第130页

3 - 65 3 Creating the PCB data 5. Creating the mark information E: Search Area X As a general guide, set this parameter to the mark diameter plus 3mm. For example, when the mark diameter is 1mm, set this parameter to &qu…

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Creating the PCB data

5. Creating the mark information

5.4 Vision parameters

Vision parameters

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A: Surface Type

This specifies the bright and dark relation between the mark surface and PCB (surrounding area).

Select "NonReflect" when the mark is darker than the surrounding area, and select "Reflect" when

the mark is brighter than the surrounding area, as shown below.

NonReflect

PCB is brighter than mark.

Reflect

Mark is brighter than PCB.

Setting

Brightness comparison

Image

PCB

Mark

PCB

Mark

Surface Type settings

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B: Algorithm Type

There are 5 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 "3.1 Pattern matching" in chapter 4.

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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Creating the PCB data

5. Creating the mark information

E: Search Area X

As a general guide, set this parameter to the mark diameter plus 3mm. For example, when the mark

diameter is 1mm, 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.

Reference

The Search Area parameter is not displayed on the Vision tab screen when "Mark Type" of the Basic parameters

is set to "Badmark".

Search Area

Mark

PCB

Search Area

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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

These parameters are used to cut the noise that usually appears within or outside the mark image

when the mark is recognized as a binary image. Optimum noise cut levels can be found with the

Mark Adjust mode explained in the next section.

N: Sequence

Set to "Normal" in most cases. If the recognition speed is important select "Quick", or if recogni-

tion accuracy is important select "Fine".

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Creating the PCB data

5. Creating the mark information

5.5 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".

Select the mark data.

Open the mark information screen and line up the cursor with the mark data you

want to check.

Press the [Adjust] button to enter the Mark Adjust mode.

The Mark Adjust screen appears as shown below.

Step 4 Step 5

Mark Adjust screen

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Set the PCB on the conveyor and clamp it.

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 [OK] button to return to the Mark Adjust screen.

Shape Type Teaching point Example

Circle, Square

Triangle, Sp. Shape

Corner

TopEdge

CirEdge

Center of mark

Corner of mark

Center of a square

edge line

Center of a round edge

: Cross cursor at center of screen

Mark teaching positions

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