Laser Safety Standards - Hitachi LM-C300 Series User Manual

1.2. LASER SAFETY STANDARDS

The Laser Marker is fitted with basic safety features at the point there might be risk of laser emission if
the allowed AEL limit is exceeded.
The Laser Marker is equipped with a protective housing which, except for the laser aperture, prevents
human access to laser emission exceeding Class I.
Laser marking system protection covers can only be removed by using tools.
Class IIIB and IV lasers (except for those of Class IIIB which do not exceed five times the Class II AEL
limit at a wavelength of 400nm to 700nm) will emit an audible or visual warning when the power source
is activated.
The beam emitted by any Class IM, IIM, IIIR, IIIB and IV laser product should end its effective path in a
diffused reflection material with suitable reflectivity and thermal properties, or an absorbent material.
Whenever possible, the laser beam open patch must be located either above or below eye level.
The final path of the laser beam should end at some diffused reflectivity element.
Mirrors, lenses and beam splitters should be tightly mounted and subject to controlled movements during
laser emission to prevent accidental spectral reflection of the emission coming from Class IIIB or IV laser
product.
There are risk control procedures for each class of laser:
• Classes IM, II, IIM, and IIIR.
They only require precautions to prevent direct, continuous view of the beam. Momentary exposure
due to accidental viewing is not considered dangerous.
• Class IIIB.
These are considered hazardous when the naked eye is exposed to the direct beam or spectral
reflection. In order to prevent these situations, the following precautions must be taken:
(1) The beam must be used in a controlled area.
(2) The beam must end its useful path at a diffused material with a suitable colour and
reflectivity that allows the beam to be positioned while minimizing the risk of reflection.
In the absence of the conditions specified in point 2, eye protection must be worn.
(3)
Any part of the laser protective housing which, when removed or
replaced to be repaired, would imply exposure to excessive emission,
requires the use of tools. This prevents exposure to excessive laser
emission in relation to the assigned AEL limit.
The safety interlock is designed to prevent the removal of the panel
until the accessible emission values are lower than the AEL of the
assigned class.
NOTE
NOTE
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