Nec VT650 Installation Data
Visual Systems
VT650 Installation Data
Desktop and Ceiling Mount
Contents
Product Description, Lens Specs, Notes and Formulas Page 1
Projection Distances and Screen Sizes
Ceiling Mount Installation
Desktop Setup
Cabinet Dimensions
Top, Front and Right Side
Bottom, Back and Left Side
Ceiling Mount Dimensions
Control Codes
Product Description
Type: 3 panel, 0.9” p-Si TFT w/MLA LCD projector Dimensions: 9.57”(W) x 4.0”(H) x 11.2”(D)
Native Resolution: 1024 x 768 Weight: 8.8 lbs
Brightness: 1500 ANSI Lumens Manual Zoom/Manual Focus
Lens Specifications
Throw Ratio: 1.8 - 2.2:1(approx.) Focal Length: 33.5mm – 40.2mm
Offset Angle: 9.3 °-9.7 °(wide)/7.8 °-8.1 °(tele) F/#: 1.7 – 2.0
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.
• 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:
B = 0.3007H H = Screen Diagonal x 4/5
C (wide) = 1.8381H – 1.724 V = Screen Diagonal x 3/5
C (tele) = 2.2057H – 1.724 Screen Diagonal = H x 5/4
D = 0.0743H
α (wide) = tan
α (tele) = tan
-1
-1
Screen Formulas (4:3):
(B/C(wide))
(B/C(tele))
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ver 1.5
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Visual Systems
VT650 Installation Data
Desktop and Ceiling Mount ver 1.5
Projection Distance and Screen Size for Ceiling Mount
The following shows the proper relative position of the projector and screen. Refer to the table for installation data.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling Mount Installation
5.9"
Lens Offset from
Mount Pipe
Screen Top
Lens Ctr
Screen Ctr
C
Throw Distance
D
α
B
5.5"
1.4"
Distance Chart
Screen Size (4:3)
BD
Diagonal Width(H) Height (V)
inches inches inches inches inches
C
wide - tele
inches
α
wide - tele
degrees
25 20 15 6.0 NA - 42.4 1.5 NA - 8.1
40 32 24 9.6 57.1 - 68.9 2.4 9.6 - 8.0
60 48 36 14.4 86.5 - 104.1 3.6 9.5 - 7.9
67 53.6 40.2 16.1 96.8 - 116.5 4.0 9.5 - 7.9
72 57.6 43.2 17.3 104.2 - 125.3 4.3 9.4 - 7.9
84 67.2 50.4 20.2 121.8 - 146.5 5.0 9.4 - 7.9
90 72 54 21.7 130.6 - 157.1 5.3 9.4 - 7.8
100 80 60 24.1 145.3 - 174.7 5.9 9.4 - 7.8
120 96 72 28.9 174.7 - 210.0 7.1 9.4 - 7.8
150 120 90 36.1 218.8 - 263.0 8.9 9.4 - 7.8
180 144 108 43.3 263.0 - 315.9 10.7 9.4 - 7.8
210 168 126 50.5 307.1 - 368.8 12.5 9.3 - 7.8
240 192 144 57.7 351.2 - 421.8 14.3 9.3 - 7.8
270 216 162 65.0 395.3 - NA 16.0 9.3 - NA
300 240 180 72.2 439.4 - NA 17.8 9.3 - NA
Note: For screen sizes not indicated on the projection tables, use the formulas on page 1.
Page 2
Visual Systems
VT650 Installation Data
Desktop and Ceiling Mount ver 1.5
Projection Distance and Screen Size for Desktop
The following diagram shows the relationship between projector position and the screen.
Distances are in inches. For millimeters multiply by 25.4.
Desktop Setup
C
Screen Ctr
B
Throw Distance
α
Projector Feet
Lens Ctr
Scrn Bottom
D
2.3"
Distance Chart
Screen Size (4:3)
BD
Diagonal Width(H) Height (V)
inches inches inches inches inches
C
wide - tele
inches
α
wide - tele
degrees
25 20 15 6.0 NA - 42.4 1.5 NA - 8.1
40 32 24 9.6 57.1 - 68.9 2.4 9.6 - 8.0
60 48 36 14.4 86.5 - 104.1 3.6 9.5 - 7.9
67 53.6 40.2 16.1 96.8 - 116.5 4.0 9.5 - 7.9
72 57.6 43.2 17.3 104.2 - 125.3 4.3 9.4 - 7.9
84 67.2 50.4 20.2 121.8 - 146.5 5.0 9.4 - 7.9
90 72 54 21.7 130.6 - 157.1 5.3 9.4 - 7.8
100 80 60 24.1 145.3 - 174.7 5.9 9.4 - 7.8
120 96 72 28.9 174.7 - 210.0 7.1 9.4 - 7.8
150 120 90 36.1 218.8 - 263.0 8.9 9.4 - 7.8
180 144 108 43.3 263.0 - 315.9 10.7 9.4 - 7.8
210 168 126 50.5 307.1 - 368.8 12.5 9.3 - 7.8
240 192 144 57.7 351.2 - 421.8 14.3 9.3 - 7.8
270 216 162 65.0 395.3 - NA 16.0 9.3 - NA
300 240 180 72.2 439.4 - NA 17.8 9.3 - NA
Note: For screen sizes not indicated on the projection tables, use the formulas on page 1.
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