NEC Display Solutions of America, Inc.
NP905 Installation Guide
Ceiling Mounted and Desktop
Rev 1.1
www.necdisplay.com
NP905
Page 1 of 6
Contents
Product Description, Lens Specs, Notes and Formulas
Pg 1
Diagrams
&
Distance
Charts
Pg 2
Cabinet Dimensions
Pg 3
Cabinet Dimensions cont
Pg 4
Ceiling Mount Dimensions and Input Panel
Pg 5
Control Codes
Pg 6
Product
Description
Type:
3
panel
LCD
projector, Brightness: 2000
ANSI
Lumens
0.63” p-Si TFT w/MLA
Dimensions:
12.2”(W) x 4.9”(H) x 11.4”(D)
Resolution:
1024 x 768
Weight:
8.16 lbs
Fan
Noise:
35
dB
/
29dB
@
1
meter
BTU’s:
1055
BTU/hour
Power Consumption: 310W (max)
Lens
Specifications
Throw Ratio:
1.5 – 1.8:1 (for 100” diagonal) Focal
Length:
18.89mm
–
22.67mm
Offset Angle:
8.4° - 10.0° (for 100” diagonal)
F/#: 1.70
-
2.07
Screen
Sizes:
21”
-
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
=
0.258W
C
(wide) = 1.4805W – 1.823
C
(tele) = 1.7765W – 1.820
D
= 0.118W
α
(wide) = tan¯¹ (B/C(wide))
α
(tele) = tan¯¹ (B/C(tele))
