NEC LT154 安装指南
Visual Systems
LT154/155/156 Installation Data
Desktop and Ceiling Mount
Rev. 1.8
Page 2
Projection Distance and Screen Size for Ceiling Mount
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.
installation.
Distances are in inches. For millimeters multiply by 25.4.
Ceiling Mount Installation
α
C
B
D
Lens Ctr
Screen Ctr
Throw Distance
Lens Offset from
Screen Top
4.2"
5.7"
Mounting Pipe
1.6"
Distance Chart
Note:
For screen sizes of 25 to 300 inches not indicated on the projection tables, use the formulas on page 1.
B
C
D
α
αα
α
Diagonal
Width
Height
wide - tele
wide - tele
40"
32"
24"
10"
62" - 72"
2"
8.8° - 7.7°
60"
48"
36"
14"
94" - 109"
4"
8.7° - 7.6°
67"
53.6"
40.2"
16"
106" - 122"
4"
8.6° - 7.6°
72"
57.6"
43.2"
17"
114" - 131"
4"
8.6° - 7.5°
84"
67.2"
50.4"
20"
133" - 153"
5"
8.6° - 7.5°
90"
72"
54"
22"
143" - 164"
5"
8.6° - 7.5°
100"
80"
60"
24"
159" - 183"
6"
8.6° - 7.5°
120"
96"
72"
29"
191" - 220"
7"
8.6° - 7.5°
150"
120"
90"
36"
239" - 275"
9"
8.6° - 7.5°
180"
144"
108"
43"
288" - 331"
11"
8.6° - 7.5°
210"
168"
126"
51"
336" - 386"
12"
8.6° - 7.5°
240"
192"
144"
58"
384" - 442"
14"
8.6° - 7.4°
270"
216"
162"
65"
432" - ----
16"
8.5° - ---
300"
240"
180"
72"
481" - ----
18"
8.5° - ---
Screen Size