Nec LT85 installation guide
Visual Systems Division
Technical Bulletin
LT85 Throw Distance Data
Desktop and Ceiling Mount Rev. 1.6
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
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
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)
-1
α = tan
(B / C) α = Throw angle
Page 1
projector Dimensions: 9.4”(W) x 2.1”(H) x 7.7”(D) (not incl. Protrusions)
Visual Systems Division
Technical Bulletin
LT85 Throw Distance Data
Desktop and Ceiling Mount Rev. 1.6
Projection Distance and Screen Size for Desktop
The following shows the proper relative positions of the projector and screen. Refer to the table to determine the position of
installation.
Distances are in inches. For millimeters multiply by 25.4.
Desktop Setup
C
Throw Distance
Screen Ctr
B
Lens Ctr
Distance Chart
Diagonal Width (H) Height (E)
40" 32" 24" 16.7" 54.7" 4.7" 17.0°
60" 48" 36" 25.1" 81.9" 7.1" 17.0°
67" 53.6" 40.2" 28.0" 90.8" 7.9" 17.1°
72" 57.6" 43.2" 30.1" 97.6" 8.5" 17.1°
84" 67.2" 50.4" 35.1" 113.8" 9.9" 17.1°
90" 72" 54" 37.6" 122.0" 10.6" 17.1°
100" 80" 60" 41.8" 135.8" 11.8" 17.1°
120" 96" 72" 50.2" 162.6" 14.2" 17.1°
150" 120" 90" 62.8" 203.5" 17.8" 17.1°
Screen Bottom
D
1.5"
Screen Size B C D
α
α
180" 144" 108" 75.3" 244.1" 21.3" 17.1°
Note:
For screen sizes of 36 to 200 inches not indicated on the projection tables, use the formulas on page 1.
Page 2
Visual Systems Division
Technical Bulletin
LT85 Throw Distance Data
Desktop and Ceiling Mount Rev. 1.6
Projection Distance and Screen Size for Ceiling Mount Installation
The following diagram shows the relationship between projector position and the screen.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling Mount Installation
Lens Ctr
Screen Ctr
Distance Chart
Diagonal Width (H) Height (E)
40" 32" 24" 16.7" 54.7" 4.7" 17.0°
60" 48" 36" 25.1" 81.9" 7.1" 17.0°
C
Throw Distance
D
Screen Top
B
Screen Size B C D
α
Lens Offset from
Ctr of Projector
2.96
LT
150
α
67" 53.6" 40.2" 28.0" 90.8" 7.9" 17.1°
72" 57.6" 43.2" 30.1" 97.6" 8.5" 17.1°
84" 67.2" 50.4" 35.1" 113.8" 9.9" 17.1°
90" 72" 54" 37.6" 122.0" 10.6" 17.1°
100" 80" 60" 41.8" 135.8" 11.8" 17.1°
120" 96" 72" 50.2" 162.6" 14.2" 17.1°
150" 120" 90" 62.8" 203.5" 17.8" 17.1°
180" 144" 108" 75.3" 244.1" 21.3" 17.1°
Note:
For screen sizes of 36 to 200 inches not indicated on the projection tables, use the formulas on page 1.
Page 3
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