19R5905752 /16 DP2K C
PR
RZ
RESTRICTED
AREA
RESTRICTED
AREA
Image 1–3
1.5 HD for fully enclosed projection systems
HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the
energy per surface unit becomes lower than the applicable exposure limit on the cornea or on the
skin. The light beam is considered (to be) unsafe for exposure if the distance from a person to the
light source is less than the HD.
Restriction Zone (RZ) based on the HD
The projector is also suitable for rear projection applications; projecting a beam onto a defuse coated
projection screen. As displayed in Image 1– 4 two areas should be considered: the restricted enclosed
projection area (RA) and the observation area (TH).
RA TH
sw
PD
HD
DIFFUSE
sw
RZ
sw
sw
PR
HD
REFLECTION
RESTRICTED
AREA
RESTRICTED
AREA
Image 1–4
RA Restricted Access location (enclosed projection area).
PR Projector.
TH Theater (observation area).
RZ Restriction Zone.
PD Projection Distance.
SW Separation Width. Must be minimum 1 meter.
For this type of setup 3 different HD shall be considered:
• HD as discussed in “High Brightness precautions: Hazard Distance”, page 17, relevant for intrabeam
exposure.
• HD
reflection
: the distance that 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.
Safety
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