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1.3. WARNING AND INFORMATION SYMBOLS
This chapter includes all symbols used in this Instruction Manual or on the Laser Marker to alert both
operating and service personnel to the precautions concerning the care, use, and handling of Laser
Marker.
1.3.1. POSSIBLE PERSONAL INJURY WARNING
This product emits infrared radiation at a wavelength of 10.6 µm. Direct or indirect exposure to laser
radiation may cause serious damage to the cornea, therefore it is mandatory to wear protective viewing
goggles in areas exposed to the laser beam. Goggles protect against scattered radiation or reflections
from metal surfaces. Protective goggles that block 10.6µm CO2 laser radiation are available from
HITACHI.
RADIATION VIEWING CONDITIONS
The laser exiting the resonator is considered an intense monochromatic light source. Due to these
features it can be seen as a source of high luminosity.
This means that its image is focused on the retina at a point of high-density power. If the beam diverges
and is dispersed on a non-reflective screen, then there would be an "extended view" of the image, with a
decisively less dangerous power density. So there are different types of radiation views based on the
access to the radiation and consequently different degrees of danger.
Direct view of the Laser beam:
This type of view is the most dangerous and can occur at the exit of the laser aperture after having
removed the lens. It must be avoided! Use of protective goggles is not sufficient to protect against
direct view of the beam.
Direct view of the beam after mirror reflection:
This may occur by directing the beam towards a reflective surface.
Viewing a beam reflected off a flat surface is very dangerous and the same as direct viewing.
Direct view of the beam after focusing:
This occurs if the laser beam is not extinguished with an appropriate absorbent at the end of its useful
path. Viewing the beam is dangerous up to a considerable distance.
Dispersive viewing of the beam after focusing:
This is the most frequent viewing condition during Laser Marker operation. Viewing the beam up close
is dangerous, but appropriate filters and goggles can ensure safety, even during prolonged exposure.
The Optical Risk Nominal Distance (O.R.N.D.) for Laser Markers of HITACHI can be over 20m for
direct or reflected radiation, and over 1m for Dispersive radiation.
Only goggles with an Optical Density (O.D.) over 4 can momentarily protect the eyes against
accidental viewing of damaging laser radiation.
Always uses goggles with a conformity certificate. Remember that no goggles can
provide prolonged protection from direct radiation.
Содержание LM-C300 Series
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