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LT180 Page
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NEC
Solutions
(America),
Inc.
Visual Systems Division
LT180 Installation Guide
Floor and Ceiling Configuration
v1.0
Contents
Product Description, Lens Specs, Screen/Aspect Ratio,
Notes and Formulas
Pg 1
Diagrams & Distance Charts; Ceiling Mounted
Pg 2
Floor
Pg 3
Cabinet
Dimensions;
Top,
Front
and
Right
Pg 4
Bottom,
Back
and
Left Pg 5
Ceiling
Mount
Dimensions Pg 6
Input
Panel
and
Control
Codes
Pg 7
Product Description
Type:
1
chip
DMD
TM
projector
Color
Wheel:
4
Segments
(2x)
Resolution: 1024
x
768 Dimensions:
7.37”(W)
x
5.24”(H)
x
13.60”(D)
Brightness:
2000 ANSI Lumens
Weight:
6.4 lbs
Contrast Ratio:
1000:1
Lens Specifications
Throw Ratio:
1.37 - 1.63:1 (for 100” Diag)
Manual
Focus/Manual
Zoom
Offset Angle:
10.5
°
- 12.4
°
(for 100” Diag)
Focal Length: 19.7mm – 23.0mm l
Screen
Sizes:
30”-200”
diagonal
(4:3)
F/#: 2.0
–
2.48
Notes
•
For screen sizes not indicated in the projection charts, use the formulas below.
•
The ceiling must be strong enough to support the projector and the installation must be in accordance with any local
building codes.
•
Distances are in inches, for millimeters multiply by 25.4.
•
Distances may vary
±
5%.
Formulas
The Projection Formulas use the image width for calculation. For proper projector placement, determine the image width for a
desired screen size. Use the Screen Formulas below to calculate all screen dimensions. Plug in the image width for “W” in the
Projection Formulas.
Refer to the diagrams and charts for popular screen sizes on page 2 & 3.
Definitions:
4:3 Screen Formulas:
W
=
Image
Width
W
= H x 4/3
H
=
Image
Height
(Size)
H
= W x 3/4
B
= Vertical distance between lens center and screen center
Screen Diagonal
= W x 5/4
C
= Throw distance
Projection Formulas:
B
=
0.2980W
C
(wide)
=
1.3908W
–
1.967
C
(tele)
=
1.6511W
–
1.945
α
(
wide) = tan
-1
(B/C(wide))
α
(tele) = tan
-1
(B/C(tele))
