NEC VT491 - Manual
This installation guide covers NEC’s VT491/590/595 projectors, focusing on setup configurations–both ceiling-mounted and desktop–and critical technical considerations like projection geometry, lens specifications, and mounting dimensions. The document provides essential specs such as resolution, brightness, and throw ratios to ensure accurate image scaling, alongside visual aids for proper projector-screen alignment. It also includes detailed cabinet measurements for both the projector and optional ceiling mounts, helping users plan installations with precision. While it touches on PC control protocols (for advanced VT595 models), its primary emphasis remains on physical setup and optical calculations.
Table of Contents:
- Page 1 – Product Specifications and Projection Calculations
- Page 2 – Projector Positioning and Distance Chart
- Page 3 – Projector Cabinet Dimensions
- Page 4 – Installation Dimensional Drawings
- Page 5 – Ceiling Mount Dimensions
- Page 6 – Input Panel Layout and Control Protocol
NEC Display Solutions of America, Inc.
VT491/590/595 Installation Guide
Ceiling Mounted and Desktop
Rev 1.3
www.necdisplay.com
VT491/590/595
Page 1 of 6
Contents
Product Description, Lens Specs, Notes and Formulas
Pg 1
Diagrams
&
Distance
Charts
Pg 2
Cabinet
Dimensions
Pg 3-4
Ceiling
Mount
Dimensions Pg 5
Input
Panel
and
Control
Codes
Pg 6
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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About this manual
- Brand
- NEC
- Model
- VT491
- Document type
- Manual
- Category
- Projector
- Language(s)
- English
- Pages
- 6
- File size
- 520.5 KB
- Format
Summary
Table of contents, product specifications including resolution, brightness, dimensions, lens specifications, and formulas for calculating projection distances and screen sizes.
Diagrams and distance chart for positioning the projector relative to a screen, illustrating throw distance, lens offset, and recommended distances based on screen size.
Technical drawings showing the cabinet dimensions of the projector in inches, including side, top, and rear views with labeled measurements.
