Am gasit asta referitor la filtrele de protectie la adresa:
http://www.system-concepts.com/stds/hsebox4-2.html
Concluzia e:
"Filters are not required to protect users from radiation. Any filters sold with
this claim should be regarded with suspicion. "
Screen filters
Glare and reflections should be avoided at source by arranging the display
and the working environment appropriately. If
this cannot be done or is not effective, then the last resort is to consider
the use of additional filters or screens. There are
several different types and they all have some advantages and several
disadvantages (apart from cost).
Mesh filters
are cheap and effective but also distort the displayed image. They are
difficult to keep clean and may produce distracting
'moire' effects if close to the screen surface.
Neutral density filters
simply reduce the amount of light passing through - rather like sunglasses.
This reduces the reflections twice (in and out)
and the displayed image once. Thus they also enhance the contrast. The
problem is that they also have a reflective front
surface and this itself can be a source of reflections.
Polarised filters
are more effective, and expensive, and eliminate reflections from the CRT
surface. However, they also suffer from
external surface reflections.
Quarter wavelength interference filters
are effective against screen reflections and surface reflections but are
expensive and finger marks show up dramatically.
Most optical filters can be obtained in plastic or glass. In general,
plastic is cheaper and lighter (and therefore needs less
substantial mounting) but is prone to surface scratching.
Filters are not required to protect users from radiation. Any filters sold
with this claim should be regarded with suspicion.
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