NEC LT84/LT140 - Manual (Page 13)

E–13
B
D
E
C
A
α
D
H
V
Unit (inch)
A=C/cos
α
B=3.7H / 25.4
C(XGA:tele)=(2.41 x H)-2.0 or C(XGA:wide) x 1.2
C(XGA:wide)=(2.0 x H)-2.0
C(SVGA:tele)=(2.43 x H)-1.75 or C(SVGA:wide) x 1.2
C(SVGA:wide)=(2.0 x H)-1.9
D=E/2
E=H/4 x 3
a=H/4 x 5
Unit (mm), H= inch
A=C/cos
α
B=3.7H
C(XGA:tele)={(2.41 x H)-2.0} x 25.4 or C(XGA:wide) x 1.2
C(XGA:wide)={(2.0 x H)-2.0} x 25.4
C(SVGA:tele)={(2.43 x H)-1.75} x 25.4 or C(SVGA:wide) x 1.2
C(SVGA:wide)={(2.0 x H)-1.9} x 25.4
D=E/2
E=H/4 x 3
a=H/4 x 5
Screen (inch)
Screen bottom
Screen center
Projector base
Screen
A: Distance between lens center and screen center
B: Vertical distance between lens center and screen bottom
(screen top for ceiling mount)
C: Horizontal throw distance between screen surface and pro-
jector lens
D: Vertical distance between screen center and screen bottom
(screen top for ceiling mount)
E: Screen Height
LT84: 1.87”(47.6mm)
LT140: 1.98”(50.4mm)
Installation Angle
The installation angle for the projector
must not exceed +/-15˚.
Deviating from this angle could degrade
the performance of the projector and may
cause reliability problems.
Distance Chart
Screen Size (inch) Projection Distance V. Distance between Lens Center and Screen Bottom
a H E C(mm) C(inch) C(mm) C(inch) B(mm) B(inch) B(mm) B(inch)
Screen size (Diagonal) Screen Width Height of screen WIDE TELE WIDE TELE
25 20 15 – – 1190 46.9 – – 74 2.9
40 32 24 1600 63.0 1930 76.0 117 4.6 117 4.6
60 48 36 2420 95.3 2910 114.6 176 6.9 176 6.9
80 64 48 3240 127.6 3900 153.5 235 9.3 235 9.3
100 80 60 4060 159.8 4890 192.5 294 11.6 294 11.6
120 96 72 4880 192.1 5870 231.1 352 13.9 352 13.9
150 120 90 6110 240.6 7350 289.4 440 17.3 440 17.3
200 160 120 8170 321.7 9820 386.6 587 23.1 587 23.1
240 192 144 9820 386.6 11790 464.2 705 27.8 705 27.8
300 240 180 12280 483.5 – – 881 34.7 881 34.7
Screen Size (inch) Projection Distance V. Distance between Lens Center and Screen Bottom
a H E C(mm) C(inch) C(mm) C(inch) B(mm) B(inch) B(mm) B(inch)
Screen size (Diagonal) Screen Width Height of screen WIDE TELE WIDE TELE
25 20 15 – – 1170 46.1 – – 74 2.9
40 32 24 1580 62.2 1910 75.2 119 4.7 119 4.7
60 48 36 2400 94.5 2890 113.8 178 7.0 178 7.0
80 64 48 3220 126.8 3870 152.4 237 9.3 237 9.3
100 80 60 4030 158.7 4850 190.9 297 11.7 297 11.7
120 96 72 4850 190.9 5830 229.5 356 14.0 356 14.0
150 120 90 6080 239.4 7300 287.4 445 17.5 445 17.5
200 160 120 8120 319.7 9750 383.9 593 23.3 593 23.3
240 192 144 9750 383.9 11710 461.0 712 28.0 712 28.0
300 240 180 12200 480.3 – – 890 35.0 890 35.0
S-VGA (LT84)
XGA (LT140)
NOTE: Distances may vary +/–5%.