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19
R5914653 /05
G62
1.4.3 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
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 1–4
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.
As described in
“High Brightness precautions: Hazard Distance”, page 17
, it is mandatory to create a
restricted zone within the beam areas closer than any HD. 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
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 projection
distance to the rear projection screen. To determine the HD distance for the used lens and projector model see
chapter
“General considerations”, page 16
.
HD
reflection
= 25% (HD – PD)
The light emitted from the screen within the observation shall never exceed the RG2 exposure limit,
determined at 10 cm. The HD
diffuse
can be neglected if the measured light at the screen surface is below 5000
cd/m² or 15000 LUX.
Summary of Contents for G62-W9
Page 1: ...ENABLING BRIGHT OUTCOMES User guide G62...
Page 2: ......
Page 4: ......
Page 8: ...R5914653 05 G62 8...
Page 21: ...21 R5914653 05 G62 2 1 Main unit 22 Product overview 2...
Page 23: ...23 R5914653 05 G62 Airflow Image 2 3 Product overview...
Page 24: ...R5914653 05 G62 24 Product overview...
Page 25: ...25 R5914653 05 G62 3 1 Input Output I O Panel 26 3 2 Control panel 26 Input Communication 3...
Page 28: ...R5914653 05 G62 28 Input Communication...
Page 33: ...33 R5914653 05 G62 30 20 30 20 Image 4 2 Remote Control Unit RCU...
Page 34: ...R5914653 05 G62 34 Remote Control Unit RCU...
Page 38: ...R5914653 05 G62 38 Powering On Off the projector...
Page 39: ...39 R5914653 05 G62 6 1 On Screen Display Menus 40 User controls 6...
Page 58: ...R5914653 05 G62 58 User control Image menu...
Page 73: ...73 R5914653 05 G62 11 1 Projector information and status 74 Information menu 11...
Page 102: ...R5914653 05 G62 102 Index...
Page 103: ......