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| NEC Display Solutions of America, Inc. | |||
| VT491/590/595 Installation Guide |
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| Ceiling Mounted and Desktop |
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| Rev 1.3 | ||||||
| Contents |
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| Product Description, Lens Specs, Notes and Formulas | Pg 1 |
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| Diagrams & Distance Charts |
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| Pg 2 |
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| Cabinet Dimensions |
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| Pg |
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| Ceiling Mount Dimensions |
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| Pg 5 |
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| Input Panel and Control Codes |
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| Pg 6 |
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| Product Description |
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| Type: |
| 3 panel LCD projector, | Brightness: | VT491: | 2000 ANSI Lumens |
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| 0.6” |
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| VT590/VT595: | 2000 ANSI Lumens | ||||
| Resolution: |
| VT491: | 800 x 600 |
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| 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 |
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| Power Consumption: 255W (max) |
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| BTU’s: | 870 BTU/hour |
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| Lens Specifications |
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| Throw Ratio: | 1.5 – 1.8:1 (for 100” diagonal) | Focal Length: | 18.9mm – 22.7mm |
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| Offset Angle: | 8.3° - 10.0° (for 100” diagonal) | F/#: | 1.7 - 2.07 |
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| Screen Sizes: | 25” - 300” diagonal (4:3) |
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| Manual Focus/Manual Zoom |
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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 |
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D = Vertical distance between lens center and screen top |
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(screen bottom for desktop application) |
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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))
www.necdisplay.com | VT491/590/595 | Page 1 of 6 |