M20_Ope_E - 第92页

Chapter 2 Creating and Editing a Program 2-48  Programm ing Fiducial Process For a step to execute fiducial process, enter “Fiduc ial” to its Task field. Then follow one of the two programmings stated below: z Programm …

Chapter 2 Creating and Editing a Program

2-47

2-7-1-6 Fiducial Function

Menu: Program>Placement&Mark Data>Task>Fiducial

Program>Placement&Mark Data>Task>Fiducial

By using recognition results of the fiducials provided on a PCB, the fiducial function corrects the

PCB positioning error resulting from errors in machining the PCB contour and locate pin holes,

PCB claming mechanism fluctuations and local distortion or warps on the PCB.

There are one-point, two-point, or four-point fiducial functions. Two or four fiducials are used as a

set, but it is okay if each mark is different in shape.

Type Target correction Remark

One-point fiducial

X, Y

Two-point fiducial

X, Y, θ

When “Without stretch/shrink correction” is

selected

X, Y, θ, Stretch/shrink

correction

F group “0” only / All fiducial marks (select)

Four-point fiducial

X, Y, θ, Deform correction

Note: In the case of two-point fiducial, it is possible to select whether stretch/shrink correction is to be

performed.

To use stretch/shrink correction, it is necessary to select whether correction is to be performed for

the global fiducial (F group “0”) only or all the fiducial marks including local fiducial marks.

Menu: Program>Board Data

Note: Stretch/shrink correction will be performed when a shared fiducial mark(F Group No. 255) is

specified.

Note: In case of the 4-point fiducial, the four marks must be positioned so that they make a square shape.

The lines AB and CD (or BC and DA) need not be parallel to each other. Each internal angle must

be smaller than 180 degrees.

Chapter 2 Creating and Editing a Program

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 Programming Fiducial Process

For a step to execute fiducial process, enter “Fiducial” to its Task field. Then follow one of the two

programmings stated below:

z Programming 1

For a step to execute global fiducial process, enter “0” (default) to its F Group No. field. For a step

for local fiducial process, enter “1” (fixed). The placement step immediately after a local fiducial

step applies the result in the previous step. Other steps with default “Fiducial=0” apply the result

of the global fiducial process. When there are more than one local fiducial steps with “Fiducial=1”,

each of them represents different local fiducial mark.

z Programming 2

For a step to execute global fiducial process, enter “0” (default) to its F Group No. field. For a step

for local fiducial process, enter “1-249”. The variation “1-249” means that up to 249 fiducial

numbers are available for identifying each local fiducial step. The placement step immediately

after a local fiducial step applies the result in the previous step. Other steps with default “F Group

No.=0” apply the result of the global fiducial process.

Example5:

Local fiducial

Global fiducial

As shown in the upper figure, suppose to orientate three chips with global fiducial, two ICs with

local fiducial. In this example, for global fiducial, two fiducials are provided, and for local fiducial,

two fiducials for each IC. Programming in use of this example will be as follows:

z Example for Programming 1 (local fiducial number is limited to 0 and 1)

F Group No. Task Description

0 Fiducial Global fiducial process (coordinates assignment)

0 Multiple Pickup Place chip (1) with global fiducial compensation

0 End Multiple Pickup Place chip (2) with global fiducial compensation

1 Fiducial Local fiducial process (coordinates assignment) for IC (1)

1 Single Pickup Place IC (1) with local fiducial compensation

1 Fiducial Local fiducial process (coordinates assignment) for IC (2)

1 Single Pickup Place IC (2) with local fiducial compensation

0 Multiple Pickup Place chip (3) with global fiducial compensation

As shown in the above program, after local fiducial compensation is used for a step, global fiducial

compensation can take effect merely with “Fiducial=0” (default) setting for a later step.

Re-assignment of the global fiducial coordinates is unnecessary.

Chapter 2 Creating and Editing a Program

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z Example for Programming 2 (local fiducial number is selectable from 0-249)

F Group No. Task Description

0 Fiducial Global fiducial process (coordinates assignment)

0 Multiple Pickup Place chip (1) with global fiducial compensation

0 End Multiple Pickup Place chip (2) with global fiducial compensation

1 Fiducial Local fiducial process (coordinates assignment) for IC (1)

1 Single Pickup Place IC (1) with local fiducial compensation

3 Fiducial Local fiducial process (coordinates assignment) for IC (2)

3 Single Pickup Place IC (2) with local fiducial compensation

0 Multiple Pickup Place chip (3) with global fiducial compensation

Note: The programming 2 is recommended rather than the programming 1. Use the programming 1

when there are 250 or more local fiducials in a program.

Note: In producing multi-up panels, fiducial process is available for each board.

 Fiducial Correction

z Local Fiducial Correction

A result of global fiducial process can correct coordinates of local fiducial marks. To enable this

function, check the “Correct local fiducial marks” box.

Menu: Program>Board Data

z Fiducial Correction by entering XY Correction Coordinates in the Comment Column

Entering XY correction coordinates in the Comment in fiducial steps correct fiducial points.

Use this function when an out of search area error occurs.

Menu: Program>Placement & Mark Data

The characters code “;o=” (semicolon, small letter o, and equal) in the comment column becomes

the command of fiducial correction. After entering the command sign (;o=”), enter in order of an X

correction coordinate, comma (,), and a Y correction coordinate without spaces.

A comment can also be entered in the Comment column. Insert a space after a Y correction

coordinate and enter a comment.

To enable the correction of local fiducial marks

check the box.