NEC LT157 Installation Instruction
Visual Systems
LT157/158 Installation Data
Desktop and Ceiling Mount
C
(tele)
=
2.4253H
–
2.576
Screen Diagonal = H x 5/4
ver 1.5
Page
1
Contents
Product Description, Lens Specs, Notes and Formulas
Page 1
Projection Distances and Screen Sizes
Ceiling
Ceiling
Mount
Installation
Page 2
Desktop Setup
Page 3
Cabinet Dimensions
Top,
Top,
Front
and
Right
Side Page 4
Bottom,
Back
and
Left
Side
Page 5
Ceiling
Mount
Dimensions Page 6
Control Codes
Page 7
Product
Description
Type:
3 panel, 0.9” p-Si TFT w/MLA LCD projector
Dimensions: 8.2”(W) x 11.1”(H) x 2.8”(D)
Native Resolution:
1024 x 768 (LT158 DVI Model)
Weight:
4.9 lbs
Brightness: 1500
ANSI
Lumens
Manual
Zoom/Manual
Focus
Lens
Specifications
Throw Ratio:
2.0 - 2.4:1(approx.)
Focal
Length:
36.5mm
–
43.7mm
Offset Angle:
8.4
°
-8.9
(wide)/7.1
°
-7.4
°
(tele) F/#: 1.7
–
2.1
Screen Sizes:
25”-300”
Notes
For screen sizes not indicated on the projection tables, use the formulas below.
If the figures on the tables do not match the results of formulas, use the figures in the table.
The ceiling must be strong enough to support the LCD projector and the installation must be in accordance with any local
building codes.
building codes.
•
All calculations are based on 4:3 aspect ratio.
•
Distances are in inches, for millimeters multiply by 25.4.
•
Distances may vary
±5%.
Formulas
Units: Inches (for millimeters multiply final number by 25.4)
Definitions:
H = Horizontal Screen Width (4:3)
V = Vertical Screen Height (4:3)
B = Vertical distance between lens center and screen center
C = Throw distance
D = Vertical distance between lens center and screen top (screen bottom for desktop application)
α = Throw Angle
Projection Formulas:
Screen Formulas (4:3):
B
=
0.2984H
H = Screen Diagonal x 4/5
C
(wide)
=
2.0215H
–
2.630
V = Screen Diagonal x 3/5
D
=
0.0766H
α (wide) = tan
-1
(B/C(wide))
α (tele) = tan
-1
(B/C(tele))