NEC LT85 Installation Guide
Visual Systems Division
Technical Bulletin
Technical Bulletin
LT85 Throw Distance Data
Desktop and Ceiling Mount
Rev. 1.6
Page 1
Contents
Product Description, Lens Specs, Notes & Formulas
Page 1
Projection Distances and Screen Sizes
Desktop Setup
Page 2
Ceiling Mount Installation
Page 3
Cabinet Dimensions
Top, Front and Right Side
Page 4
Bottom, Back and Left Side
Page 5
Timing Chart
Page 6
PC Control Codes
Page 7
Product Description
Type:
Single chip DLP
projector
Dimensions: 9.4”(W) x 2.1”(H) x 7.7”(D)
(not incl. Protrusions)
Native Resolution:
800 x 600
Weight:
3.3 lbs
Brightness:
800 ANSI Lumens
Lens Specifications
Manual Focus (No Zoom)
F3.0
f = 20.3mm
Screen Sizes:
36" - 200" diagonal
Throw Ratio:
1.64 - 1.69:1 (dependent on screen size and focus setting)
Offset Angle:
17.0
°
– 17.2
°
Notes
§ For Screen Sizes of 36 to 200 inches not indicated on the projection tables, use the formulas below.
§ If the figures on the tables do not match the figures in the 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
§ If the figures on the tables do not match the figures in the 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.
•
All calculations are based on screen with. (regardless of 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)
D = Screen Diagonal (4:3)
H = D x 0.8
H = Screen Width (4:3)
V = D x 0.6
V = Screen Height (4:3)
B = 0.5222H
B = Vertical distance between lens center and screen center
C = 1.696H – 0.1344
C = Throw distance
D = 0.1472H
D = Vertical distance between lens center and top of screen (bottom of screen for
desktop application)
α
= tan
-1
(B / C)
α
= Throw angle