YSP_Users_E.pdf - 第194页
6-10 6 Other functions 2.1 Pattern registration T o 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. S…
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Other functions
2. Pattern matching
Pattern matching is a function for correcting board and mask dimensional errors and positioning errors
occurring from the board clamping mechanism. To use this function, the image of a particular pattern on
the board or mask must be registered as the template. Errors or distortion are corrected by comparing the
registered template with an actual pattern being recognized. Pattern matching is useful when the fiducial
function cannot be used, for example, when there are no fiducial marks on the board or mask, or the mark
does not match any mark recommended by YAMAHA.
Any shape of pattern can be used as a pattern, but the pattern image size should be smaller than about
1/4th of the vision monitor and must meet the following conditions.
• Each pattern clearly contrasts with the board or mask frame. (Patterns with a definite outline can be used if the contrast
is low.)
• A pair of patterns are diagonally opposing on the board or mask frame. (The same point cannot be used.)
No good
OKOK
OK OK
Pattern conditions
Pattern
Pattern
Board or mask
Board or mask
Low contrast
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CAUTION
Pattern matching requires a longer recognition time than normal mark recognition and its accuracy may drop slightly
compared to cases using circular and square marks. It is not necessary to use pattern matching for marks that can be
correctly recognized with "Algorithm Type" set to "Normal".
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Other functions
2.1 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
conditions explained previously.
2
Open the Mark screen and enter the pattern name.
In the Mark Name column, enter the name that you can easily identify as a pattern.
Entering the pattern name
Enter the pattern name.
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Set "Mark Type" on the [Basic] tab.
Set "Mark Type" to "Board Fiducial" when creating pattern data on a board, or set to "Mask Fiducial"
when creating pattern data on a mask.
"Mark Type" setting
Set "Mark Type".
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Other functions
4
Set "Algorithm Type" on the [Vision] tab.
Set "Algorithm Type" 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 the "PTRN Outline" setting and also data size will also be larger.
PTRN Whole : This parameter is effective when you want to acquire a pattern including its details.
Since the entire pattern is recognized at a lower compression ratio, this parameter
setting requires a longer recognition time than in the "PTRN GrayLev" setting and also
the data size will be even larger.
"Algorithm Type" setting
Set to "PTRN Outline" or "PTRN GrayLev" or "PTRN Whole".
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Pattern recognition types
PTRN outline PTRN Graylev
(Uneven brigtness) (Uniform brighness)
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Press the [Adjust] button to open the Mark Adjust screen.
Mark Adjust screen
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