NEC NP905 User Manual 2
NEC Display Solutions of America, Inc.
NP905 Installation Guide
Ceiling Mounted and Desktop Rev 1.1
Contents
Product Description, Lens Specs, Notes and Formulas Pg 1
Diagrams & Distance Charts
Cabinet Dimensions
Cabinet Dimensions cont
Ceiling Mount Dimensions and Input Panel
Control Codes
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))
Pg 2
Pg 3
Pg 4
Pg 5
Pg 6
www.necdisplay.com NP905 Page 1 of 6
inch
d
inch
NEC Display Solutions of America, Inc.
NP905 Installation Guide
Ceiling Mounted and Desktop Rev 1.1
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
Lens Ctr
Screen Ctr
Screen Top
D
B
Desktop
Screen Ctr
Lens Ctr
B
D
Screen Bottom
Distance Chart for popular 4:3 screens
For screen sizes not indicated on the projection
Note:
tables, use the formulas on page 1.
www.necdisplay.com NP905 Page 2 of 6
Screen Size (4:3)
Diagonal Width(W) Height (H)
inches inches inches inches
30 24 18 6 34 - 41 10.2 - 8.5
60 48 36 12 69 - 83 10.1 - 8.4
67 53.6 40.2 14 78 - 93 10.1 - 8.4
72 57.6 43.2 15 83 - 101 10.0 - 8.4
84 67.2 50.4 17 98 - 118 10.0 - 8.4
90 72 54 19 105 - 126 10.0 - 8.4
100 80 60 21 117 - 140 10.0 - 8.4
120 96 72 25 140 - 169 10.0 - 8.3
150 120 90 31 176 - 211 10.0 - 8.3
180 144 108 37 211 - 254 10.0 - 8.3
210 168 126 43 247 - 297 10.0 - 8.3
240 192 144 50 282 - 339 9.9 - 8.3
270 216 162 56 318 - 382 9.9 - 8.3
300 240 180 62 353 - 425 9.9 - 8.3
B
C
Throw Distance
C
Throw Distance
C
w ide - tele
5.63"
6.01"
Lens Offset From
Mount Pipe
3.74
2.85"
D
es
es
-3
-6
-6
-7
-8
-8
-9
-11
-14
-17
-20
-23
-25
-28
α
w ide - tele
egrees
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