18
Visor Guards
Visor guards are required to prevent the escape of scattered radiation.
Often the access guarding can be designed to perform this function
without the need of an extra guard.
WARNING: Visor guards have to be installed at a
minimum distance of four times the focus
distance to the laser beam.
Beam Stop Guard
A beam stop guard is required for applications where guarding material
is fitted within 100mm of the laser lens focal plane. The beam stop is to
prevent burn through of the guard should the laser be repeatedly
operated without the substrate in position. The beam stop must be
capable of absorbing the full output power of the laser for a period of
eight hours and be large enough to cover the complete laser marking
field area.
Substrate
Laser Beam Path
Access/Visor Guard
Laser Head
Lens
Scattered
Radiation
Scattered
Radiation
Substrate
Laser Beam Path
Access Guard
Laser Head
Lens
Beam Stop
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