operation-cp45.pdf - 第67页
Basic Configuration and Name of Each Part 2-15 2.9.1. Fiducial inspection 2.9.1.1. T ypes of fiducial mark Figur e 2-10. T ypes of Fiducial Mark Repeatability: ± 5 ㎛ Resolution: 43 ㎛ /pixel ± 5% Image processing sp…
Samsung Component Placer CP-45F(V)/FS Operations Manual
2-14
2.8. Detection of Improper Component Pickups
A vacuum sensor that can detect improper adsorption of components due to fluctuations
in the vacuum pressure during adsorption is provided. A default vacuum pressure values
during adsorption is set for each nozzle, and it also can be set as desired for each nozzle
for safe adsorption.
In the vision recognition mode, vacuum sensor will only detect improper adsorption of
components.
2.9. PCB Coordinate Correction Function (Fiducial Mark Recognition)
This function is to correct the placement position by comparing the position of the
fiducial mark that has already been inputted with the read-in position of the fiducial mark
indicated on PCB by using a move camera.
There are two methods of correction: one is a global correction, the other is a local
correction.
Global correction
Each point is corrected based on one or two points in a PCB. In the case of an array
PCB, correction can be made for each arrayed PCB.
Local correction
Fiducial correction is made for each important point (QFP, etc.) in a PCB.
Corrections can be selectively made on the components requires the corrections.
The correction of fiducial mark recognition coordinate is possible only if a mark that
can serve as a reference on the PCB exists.
Performing a local correction of each component after a global correction of each
PCB allows high-precision placement of the component by ensuring more reliable
correction of the component position.
Fiducial mark recognition is rather limited for our CP-45FV model. please contact
our Business Department or C/S Center.
Memo
Basic Configuration and Name of Each Part
2-15
2.9.1. Fiducial inspection
2.9.1.1. Types of fiducial mark
Figure 2-10. Types of Fiducial Mark
Repeatability: ± 5㎛
Resolution: 43 ㎛/pixel ± 5%
Image processing speed: 100 msec (ø 2mm circle )
2.9.1.2. Size and allowable tolerance of fiducial mark
The outer size of each fiducial mark is 0.5 mm - 5.0 mm, and the allowable tolerance
should be within 10%.
2.9.1.3. Clearance area
Each fiducial mark should have a square clearance area, around which there is no other
marks such as a conductor patterns, remaining leads, markings, etc. The square clearance
area should secure at least 0.5mm from the outer edge of the circumference of the mark.
In other words, there should be no mark within 0.5mm from the boundary of the fiducial
mark.
2.9.1.4. Basic materials and surface treatment of marks
All recognition marks should be coated with non-surface-treated copper clad or one of the
following materials.
Transparent non-oxidizing coating.
Nickel coating
Tin coating
Samsung Component Placer CP-45F(V)/FS Operations Manual
2-16
Lead plating
Gold plating
Hot-wing repeller solder coating
Flux coating
The surface of a fiducial mark should appear in complete contrast to printed circuit part
so that it is clearly distinguishable from the circuits that are already printed. It should
always be clean without dirt or contamination.
2.9.1.5. Evenness of fiducial marks
The surface of a fiducial mark should be even and smooth. Unevenness of the surface
should be within 0.02mm, and a material covering the surface of a fiducial mark should
also be even and smooth (That is, the protruding portion from the fiducial mark surface
should be within 0.02mm.).
2.9.1.6. Bad-Marks
If you don't want a component to be placed on a PCB, indicate the bad-mark on the PCB
(The position of bad-mark should be consistent).
It should appear in complete contrast to the background color of PCB, and have a
diameter of more than 2.5mm.
In the production program, a shading(dark or light) indication with respect to the
background color of PCB may be designated arbitrarily as a bad-mark.
Warning
Pressing the Start switch without checking the presence
of worker nearby could cause injury.
Be sure to check if there is any worker near the machine
before pressing the Start switch.
Memo