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r Nominal Ocular Hazard Distance (GB 7247.1 － 2012)
The distance from the projection lens surface at which the beam irradiance or radiant exposure reaches the
maximum permissible exposure (MPE) of cornea is known as nominal ocular hazard distance (NOHD). The area
where the beam irradiance or radiant exposure exceeds the cornea's maximum permissible exposure is known as
nominal ocular hazard area (NOHA). Do not look into or expose skin to the projected light from inside the nominal
ocular hazard area, which is within the nominal ocular hazard distance. Exposure to direct light from the projector
or diffused reflection may damage the eye or skin.
D1
D2
Projection lens
Model No.
ET-D3LEW10C
ET-D75LE10C
ET-D3LES20C
ET-D75LE20C
ET-D3LET30C
ET-D75LE30C
ET-D3LET40C
ET-D75LE40C
ET-D75LE8
*1 NOHD: Nominal Ocular Hazard Distance
*2 The values of D1 to D4 will change in accordance with the lens shift amount. Each value in the table is the maximum value.
Note
f The value in the table is based on GB 7247.1 － 2012.
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NOHD
NOHA
Except ET-D3LEU100C, ET-D3LEW200C, ET-D75LE95C
NOHD
*1
D1
*2
1.2
0.64
1.8
0.74
4.0
1.11
4.8
0.70
6.3
0.58
NOHD
D3
NOHA
D4
D2
*2
D3
*2
0.64
0.69
0.74
0.79
1.11
1.19
0.70
0.75
0.58
0.62
(Unit: m)
D4
*2
0.69
0.79
1.19
0.75
0.62
ENGLISH - 7
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