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As described in "High Brightness precautions: Hazard Distance (HD)", page 8 , it is mandatory to create a restricted zone within
the beam areas closer than any NOHD. In the enclosed projection area the combination 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 screen (HD
separation.
The HD
distance equals 25% of the difference between the determined HD distance and the projection distance to the rear
reflection
projection screen. To determine the HD distance for the used lens and projector model see graphs in chapter "HD in function of the
lens Throw Ratio (TR)", page 11.
HD
= 25% (HD – PD)
reflection
The light emitted from the screen within the observation shall never exceed the RG2 exposure limit, determined at 10 cm. The
HD
can be neglected if the measured light at the screen surface is below 5000 cd/m² or 15000 LUX.
diffuse
1.4.4
HD in function of the lens Throw Ratio (TR)
TR (Throw Ratio)
The ratio of the distance to the screen (throw) to the screen width.
HD versus Throw Ratio
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0.4
0.8
1.2
Image 1-4
Graph shows Hazard Distance in meters versus Throw ratio of the lens
R5906852 F80 SERIES 21/09/2017
F80-Q7, F80-4K7
1.6
2.0
2.3
2.7
3.1
3.5
F80-Ultra, F80-Q9, F80-4K9
3.9
4.3
4.7
5.1
5.5
5.9
6.3
Throw Ra o
); also taking into account a 1 meter lateral
reflection
6.7
7.1
7.5
7.9
8.3
8.7
1. Safety
9.1
9.5
9.9
11
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