Instruction Manual

Component Description 3-7
3.8.6 Laser Fan Width Control System
Laser Fan Width Control provides closed-loop control of the conformal coating process, automatically
compensating for variables within the process environment that can affect fluid fan width. Fan width
programming, accomplished through the ECXP software, can be retrofitted to existing Century Series
Dispensing Systems equipped with the SC-105 and SC-205 Film Coater Modules.
When a fan-width instruction is executed, the tool tip moves over a special cup equipped with a laser
sensor. The laser sensor measures the fan width while the coating fluid is dispensed into the cup. The
fluid pressure controls the fan width; the higher the pressure the greater the fan width. If the measured fan
width is greater than the set tolerance, the fluid pressure is decreased. If the measured fan width is less
than the set tolerance, the fluid pressure is increased.
" NOTE The fan width is measured in air, so the actual width of the coating fluid dispensed on a
production substrate will be wider. For manufacturers requiring statistical quality control
(SQC) of production parameters, the ECXP database utility automatically records process
variables, including fan width adjustment for post-process analysis. For more
information, see 6.13 Production Statistics.
Amplifier
Pressure Controller Laser Sensor
Figure 3-3 Laser Fan Width Control System
WARNING! Looking directly at the laser beam may result in serious eye injury. Refer to
Section 2 - Safety for important safety information regarding Class II laser
safety precautions.