2. Safety Information
Restriction Zone (RZ) based on the HD
The projector is also suitable for rear projection applications; projecting a beam onto a defuse co ated projection screen. As displayed
in image 2-3 two areas should be considered: the restricted enclosed projection area ( RA) and the observation area ( TH).
RA TH
sw
PD
HDDIFFUSE
sw
RZ
sw
sw
PR
HD
REFLECTION
RESTRICTED
AREA
RESTRICTED
AREA
Image 2-3
RA Restricted Access location (enclosed projection area).
PR Projector.
TH Theater (observation area).
RZ Restriction Zone.
PD Projection Distance.
SW Separation W idth. Must be minimum 1 m eter.
For this type of setup 3 different HD shall be considered:
• HD as discussed in "High Br ightness precautions: Hazard D istance (HD)", page 11, relevant for intrabeam exposure.
•HD
reflection
: the distance t hat has to be kept restrictive related to the reflected light from the rear projection screen.
•HD
diffuse
: the relevant distance to be considered while observing the diffuse surface of the rear projection screen.
As des cribed in "High Brightness precautions: Hazard Distance (HD)", page 11, it is mandatory to crea te a restricted zone within
the beam areas closer than any HD. In the enclosed pro
jection area the com bination of two restricted zones are relevant: The
restricted zone of the projected beam toward the screen; taking into account 1 meter Separation Width (SW ) from the beam onward.
Combined with the restricted zone related to the rear reflection from the s creen (HD
reflection
); also taking into account a 1 meter lateral
separation.
The HD
reflection
distance equals 25% of the difference between the determined HD distance and the p rojection distance to the rear
projection screen. To determine the HD distance for the used lens and projector model see graph s in chapter "HD in fun ction of
modifying optics", page 14.
HD
reflection
= 25% (HD – PD)
The lig ht emitted from the s creen within the observation shall never exceed the RG 2 exposure limit, determ ined at 10 cm. The
HD
diffuse
can b e neglected if the m easur ed light at the screen surface is below 5000 c d/m² or 15000 LUX .
R5906787 THOR 26/01/2018 13
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