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F70 Series
1.5 Hazard Distance for fully closed projection
system
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 1-3 two areas should be considered: the restricted enclosed
projection area (RA) and the observation area (TH).
RA
TH
sw
PD
HD
DIFFUSE
s
w
RZ
s
w
s
w
PR
HD
REFLECTION
RESTRICTED
AREA
R
E
S
T
R
IC
T
E
D
A
R
E
A
Image 1–3
RA
Restricted Access location (Enclosed projection area)
PR
Projector.
TH
Theater (observation area).
RZ
Restriction Zone
PD
Projection Distan
SW
Separation Width. Must be minimum 1 meter.
Restriction zone (RZ) based on the HD continued.
For this type of setup 3 different HD shall be considered:
•
HD as discussed in "High Brightness precautions: Hazard Distance (HD)", page 6 , relevant for intrabeam
exposure.
•
HDreflection : the distance that has to be kept restrictive related to the reflected light from the rear
projection screen.
•
HDdiffuse : the relevant distance to be considered while observing the defuse surface of the rear projection
screen.
As described in "High Brightness precautions: Hazard Distance (HD)", page 6 , 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 (HDreflection); also taking into account a 1 meter lateral separation.
The HDreflection distance equals 25% of the difference between the determined HD distance and the
projection distance to the rear 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 8 .
HDreflection = 25% (HD – PD)
Summary of Contents for F70 Series
Page 1: ...ENABLING BRIGHT OUTCOMES User Manual F70 Series...
Page 10: ...601 426 15 F70 Series 10...
Page 60: ...601 426 15 F70 Series 60 Lenses Handling and features...
Page 82: ...601 426 15 F70 Series 82 Getting started...
Page 88: ...601 426 15 F70 Series 88 Source menu...
Page 162: ...601 426 15 F70 Series 162 System settings menu...
Page 166: ...601 426 15 F70 Series 166 GUI Status menu...
Page 170: ...601 426 15 F70 Series 170 3D...
Page 171: ...171 601 426 15 F70 Series 13 1 Upgrade procedure 172 Upgrade projector firmware 13...
Page 182: ...601 426 15 F70 Series 182 Technical Specifications...
Page 191: ...191 601 426 15 F70 Series C 1 DMX chart Basic 192 C 2 DMX chart Extended 193 DMX Chart C...
Page 216: ...601 426 15 F70 Series 216 Index...
Page 217: ......