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7 Vision Systems SIPLACE 80S /F/G User’s Manual 7.6 Test Component Edition 07/97 f rom Software Version SR.010.xx 7 - 74 Line engine er – Dimensi ons of the component – Angle of rotation a nd – Meas urem ent qua lity f a…
SIPLACE 80S/F/G User’s Manual 7 Vision Systems
Edition 07/97 from Software Version SR.010.xx 7.6 Test Component
Line engineer 7 - 73
The IC head of the 80F machine picks up the BGAs or flip chips from the flatpack magazines. However the
evaluation procedures which have been used so far for conventional components are no longer adequate for
optical centering of BGAs and flip chips. For this reason new evaluation procedures and new lighting methods
at the IC sensor and/or FC sensor have been developed to make it possible to center optically this new gener-
ation of components. BGAs and flip chips which cannot be optically centered will be returned to the flatpack
magazine by the IC head for further analysis.
Fig. 7.6.10
Optical gauging of conventional components with lead connections in the 80S and 80F placement
machine
The crosshairs show the center of gravity of the component. The component outlines are emphasized by
color.
The measured values represent the geometric component parameters such as
–
Pin deviation
The value for the lead deviation is output if you have selected the "Lead-driven" measurement mode.
–
Spacing
The value is output if the "Corner-driven" measurement mode is active as the last measurement step.
–
Number of pins
–
x / y offset
–
Orthogonality
Measure component
GF No. = 5
X offset = ... Y offset = ...
Phi = ...
Orthogon = ...
No. of pins = ...
Quality fact. = ...
Length[mm] = ...
Width[mm] = ...
Spacing[mm] =
RET: Measure component
P.dev.[mm] =
7 Vision Systems SIPLACE 80S/F/G User’s Manual
7.6 Test Component Edition 07/97 from Software Version SR.010.xx
7 - 74 Line engineer
–
Dimensions of the component
–
Angle of rotation and
–
Measurement quality factor.
With “ESC” you may quit this option, the video image disappears. The menu “Test component” reappears on
the screen.
Color overlays of the individual measurement steps in cycle mode
1. Size-Driven Mode
See Section 7.6.5.2 from page 7 - 95 for a definition of the measuring methods.
This measurement mode can be recognized by rotating windows around the edges of the component
Procedure
I. Within the search window profiles are shown in x and y directions. By means of the gradients derived from
these and a geometric filter the approximate position of the component is determined.
II. Windows rotate around the edges of the component. For each window the profile and the gradients are
determined. The sum of the gradients is a measure of the agreement of the window angle with the position
of the component.
If the sum of the gradients reaches a maximum, the angular position of the component has been deter-
mined.
III. Under the angle determined in II the first step (I) is repeated. Now the position of the component can be
determined more exactly on the x and y axes.
Rectangles:
green: x and y location tolerances
orange: Component dimensions and tolerances sent from the station
blue: Search window for position recognition
Comments
1. The position in which the component was found must lie within the green rectangle or the compo-
nent is not mounted.
Applies to all measurement steps!
2. The component must be located inside the orange window or the measurement results should be
questioned.
3. The search windows should have the same alignment as the component and be larger than it.
Lines:
red: Component edges found
Comments:
The red lines are often covered by others and it may not be possible to recognize them.
SIPLACE 80S/F/G User’s Manual 7 Vision Systems
Edition 07/97 from Software Version SR.010.xx 7.6 Test Component
Line engineer 7 - 75
Overlay:
grey: Profile in the respective direction of integration
blue: Gradients from the above profiles
yellow: Result of the geometric filter
red: Interpolation limits for determining position
light blue: Result of interpolation -> position
Comments:
The interpolation result should be found around the maximum of the geometric filter.
Cross:
white: Result of position recognition -> x, y, angle
Diagram:
Result function of the angle search (rotating windows).
Comments:
The minimum (corresponds to the maximum of the sum of the gradients) gives the non-interpolated
relative position. The final result (through interpolation) is displayed by a light blue line. The accuracy
of the diagram is limited by the resolution of the monitor.
2. Row-Driven Mode
See Section 7.6.5.2 from page 7 - 95 for a definition of the measuring methods.
This measurement mode can be recognized by a number of windows around the middle pins of a row of pins.
Procedure:
I. Position recognition takes place via the formation of profile vertical to the direction of the pins. This is used
to determine the edges of the component.
II. With two additional windows the relative position of the component can be determined.
Rectangles:
green: x and y location tolerances
light blue: A. 2 to 4 search windows for position recognition. These are located around the middle
pins of each pin row.
B. 2 Additional search windows for angle measurement. Both windows lie in the same pin
row.
Star:
orange: Result of the first scan procedure
Comments:
The star indicates the position in the pin direction. Depending on the measurement algorithm used the
middle or the tip of the pin will be displayed.