NEC MultiSync LT81 User Manual page 18

Desk top
Ceiling mount
INSTALLATION
Screen
C
Screen center
A
Screen bottom
Projector feet
C
Projector feet
A
Screen top
Screen center
Unit (inch)
H (inch) = Width of screen
A = C / cos
B = 3.7H / 25.4
C (WIDE) = (2.026 H) – 2.437
C (TELE) = C (WIDE) 1.3
D = E / 2
E = H / 4 3
E
Unit (mm)
H (inch) = Width of screen
D
A = C / cos
B = 3.7H
C (WIDE) ={(2.026 H) – 2.437}
B
C (TELE) = C (WIDE) 1.3
D = E / 2
E = H / 4 3
LT100 : 3.8" (97mm)
LT81 : 3.4" (85.6mm)
LT100 : 3.8" (97mm)
LT81 : 3.4" (85.6mm)
B
A : Distance between lens center and
screen center
B : Vertical distance between lens center
D
and screen bottom (screen top for ceil-
ing mount)
E C : Horizontal throw distance between
screen surface and projector lens
D : Vertical distance between screen
center and screen bottom (screen top
for ceiling mount)
E : Screen Height
33
25.4
34