YV180X_Ope_E.pdf - 第293页
6 -58 EPD8013110 Operation Chapter 6 6 Using various functions 6 9.1 Pattern registration T o utilize pattern matching, you must register the reference pattern in the template. 1 Decide on the pattern. Decide which patte…
6
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EPD8013110
Operation
Chapter 6
6
Using various functions
9. Pattern matching
Pattern matching is a function for correcting PCB dimensional or reference
hole errors, positioning errors occurring from the PCB clamping mecha-
nism, or local distortion of the PCB. To use this function, the image of a
particular PCB pattern must be registered as the template. Errors or
distortion are corrected by comparing the template you registered with an
actual pattern being recognized. Pattern matching is useful when the
fiducial function cannot be used, for example, if the PCB has no fiducial
marks or the mark does not match any mark recommended by YAMAHA.
Any shape of pattern can be used, but the pattern image should be smaller
than about 1/4th of the monitor. Pattern matching accuracy may drops
slightly compared to cases in which round or square marks are used.
Pattern matching
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Open Mark Info.
Excute Adjust
Assistant
Save data
Secure the PCB
in place
Save Pattern
Check Pattern
display
Execute
VISION TEST
Set Algorithm
Type to “Pattern”
Register
Pattern Data
c
CAUTION
Pattern matching requires a longer recognition time than normal mark recognition. It is
not necessary to use pattern matching for marks which can be correctly recognized with
the Algorithm Type parameter in the Vision Info. sub-window set to “Normal”.
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EPD8013110
Operation
Chapter 6
6
Using various functions
6
9.1 Pattern registration
To utilize pattern matching, you must register the reference pattern in the
template.
1 Decide on the pattern.
Decide which pattern you want to use for pattern matching. Select a pair
of patterns that meet the following conditions.
• Each pattern clearly contrasts with the PCB. (It is okay if the outline of
each pattern is definite.)
• A pair of patterns are diagonally opposing on the PCB. (The same point
cannot be used.)
• Each pattern should have the same shape and face the same direction.
Pattern conditions
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Pattern
NG OK
2 Register the pattern data in the mark information.
1. In the <2/1/EDIT_DATA> mode, select “Mark Info.” from the edit object
list and press the [ENTER] key.
(When you are editing other information, pressing the [F3] key displays
the edit item list.)
2. Move the cursor to the No. for registering the data and enter a name in
the “MARK NAME” column to allow identification of this pattern.
Mark Info. screen
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PCB :
No.
1
2
3
MARK NAME COMMENT
Mark Type Info.
Edit Term :
OBJ :Mark Info.
<<<APPLICATION>>>
<<MODE>>1/EDIT_DATA
2/DATA/M
Mark Type
Database Number
Enter the mark name to be recognized as a pattern.
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EPD8013110
Operation
Chapter 6
6
Using various functions
3 Set the parameters in the sub-window.
Press the [TAB] key to move the cursor to the sub-window (right window)
and set the following parameters. The display of sub-window can be
switched by pressing the [F4] key.
1. Open the Mark Type Info. sub-window and set the “Mark Type”
parameter to “Fiducial”.
2. Open the Vision Info. sub-window and set the “Algorithm Type”
parameter to “PTRN Outline” or “PTRN GrayLev”.
PTRN Outline : In most cases, select this parameter for pattern
matching. When the outline is definite, the
pattern can be recognized even if uneven
brightness portions are present inside the
pattern.
PTRN GrayLev : Selecting this parameter is more effective in
recognizing a pattern whose brightness is
uniform inside the pattern. This parameter
setting requires a longer time to recognize a
pattern than in the “PTRN Outline” setting and
also the data size will be larger.
Vision Info. sub-window
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PATRN Outline
PCB:
Vision Info.
Edit Term
Algorithm Type
OBJ : Mark Info.
MARK NAMENo.
1
2
3
COMMENT
:
:
<<<APPLICATION>>> 2/DATA/M
<<MODE>> 1/EDIT_DATA
Set this parameter to "PTRN Outline" or "PTRN GreyLev".
Pattern recognition types
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PTRN Outline
(Uneven bri
g
tness)
PTRN Graylev
(Uniform bri
g
htness
)
Reference
The “Algorithm Type” parameter does not appear in the Vision Info. sub-window if the
“Mark Type” parameter in the Mark Type Info. sub-window has not been set to “Fidu-
cial”.