NEC VT491 User Manual

NEC Display Solutions of America, Inc.
VT491/590/595 Installation Guide
Ceiling Mounted and Desktop Rev 1.3

Contents

Product Description
Type: 3 panel LCD projector, Brightness: VT491: 2000 ANSI Lumens
0.6” p-Si TFT w/MLA VT590/VT595: 2000 ANSI Lumens Resolution: VT491: 800 x 600 VT590/VT595: 1024x768 Fan Noise: 34 dB / 29dB @ 1 meter
Dimensions: 12.1” (W) x 4.4” (H) x 10.2” (D) Weight: 6.17 lbs Power Consumption: 255W (max) BTU’s: 870 BTU/hour
Lens Specifications
Throw Ratio: 1.5 – 1.8:1 (for 100” diagonal) Focal Length: 18.9mm 22.7mm Offset Angle: 8.3° - 10.0° (for 100” diagonal) F/#: 1.7 - 2.07 Screen Sizes: 25” - 300” diagonal (4:3) Manual Focus/Manual Zoom
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.
All calculations are based on 4:3 aspect ratio.
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 projection placement, determine the image width for the desired screen size. Use the Screen Formulas below to calculate all screen dimensions. Plug in the width for “W” in the Projection Formulas. Refer to the diagrams and charts for popular screen sizes on page 2:
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 D = Vertical distance between lens center and screen top (screen bottom for desktop application)
Projection Formulas: B = 0.266W C (wide) = 1.525W – 1.176 C (tele) = 1.828W – 1.173 D = 0.108W
α (wide) = tan¯¹ (B/C(wide)) α (tele) = tan¯¹ (B/C(tele))
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NEC Display Solutions of America, Inc.
VT491/590/595 Installation Guide
Ceiling Mounted and Desktop Rev 1.3

Diagrams and Distance Charts

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.
Ceiling Mounted
Screen Ctr
D
Lens Ctr
B
Desktop
Screen Ctr
Lens Ctr
B
D
Distance Chart for popular 4:3 screens
Note: For screen sizes not indicated on the projection
tables, use the formulas on page 1.
Screen Top
Screen Bottom
Screen Size (4:3)
Diag W H
inches inches inches inches inches
30 24 18 6 -3 60 48 36 13 -5 72 57.6 43.2 15 -6 84 67.2 50.4 18 -7
90 72 54 19 -8 100 80 60 21 -9 120 96 72 26 -10 150 120 90 32 -13 180 144 108 38 -16 200 160 120 43 -17 250 200 150 53 -22 300 240 180 64 -26
C
Throw Distance
C
Throw Distance
B
5.26"
5.68"
Lens Offset From Mount Pipe
3.27"
2.57"
C
wide - tele
D
α
wide - tele
inches degrees 35 - 43 10.2 - 8.5 72 - 87 10.1 - 8.4
87 - 104 10.0 - 8.4 101 - 122 10.0 - 8.4 109 - 130 10.0 - 8.4 121 - 145 10.0 - 8.3 145 - 174 10.0 - 8.3 182 - 218 10.0 - 8.3 218 - 262 10.0 - 8.3 243 - 291 10.0 - 8.3 304 - 364 9.9 - 8.3 365 - 438 9.9 - 8.3
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