DEK高级培训资料 - 第124页
Screen Image Screen Image Xr Xr Y Y Alignment theory Issue 2: July 2007 Screen Image Board Board Screen Image Xf Xf Limits of travel: Xf,Xr = +/- 9 app rox., Y = +/- 9mm approx. Of fset s: Y = +/- 1mm, X = +/- 1mm, theta…
STENCIL
Alignment theory
Issue 2: July 2007
BOARD
STENCIL
STENCIL
BOARD
BOARD
Screen Image
Screen Image
Xr
Xr
Y
Y
Alignment theory
Issue 2: July 2007
Screen Image
Board
Board
Screen Image
Xf
Xf
Limits of travel: Xf,Xr = +/- 9 approx., Y = +/- 9mm approx.
Offsets: Y = +/- 1mm, X = +/- 1mm, theta +/- 1000aSec
Alignment theory
•
The actual distance moved by the actuators
will be determined by:
– Distance between board and stencil
– Camera scale and offset calibration factors
Issue 2: July 2007
– Camera scale and offset calibration factors
– Applied offsets
– Alignment weighting
– Pitch of actuator lead screw
– Step configuration of drive card
– Smallest moveable distance
• 3.41 microns currently
• 0.4 microns with micro-step introduction