NEC VT490, User Manual

Page: 98 / 268

11
2. Installation and Connections
Screen bottom
Projector bottom
C
α
B
D
Lens center
Screen center
Throw Distance and Screen Size
The following shows the proper relative positions of the projector and screen. Refer to the table to determine the
position of installation.
Distance Chart
B = Vertical distance between lens center and
screen center
C = Throw distance
D = Vertical distance between lens center and
screen bottom (top of screen for ceiling
application)
α
= Throw angle
NOTE: Distances may vary +/-5%.
VT595/VT590/VT491/VT59
Screen Size C
α
B
Diagonal
inch
21
25
30
40
60
72
80
84
90
100
120
150
180
200
210
240
270
300
mm
533
635
762
1016
1524
1829
2032
2134
2286
2540
3048
3810
4572
5080
5334
6096
6858
7620
inch
17
20
24
32
48
58
64
67
72
80
96
120
144
160
168
192
216
240
mm
427
508
610
813
1219
1463
1626
1707
1829
2032
2438
3048
3658
4064
4267
4877
5486
6096
inch
13
15
18
24
36
43
48
50
54
60
72
90
108
120
126
144
162
180
mm
320
381
457
610
914
1097
1219
1280
1372
1524
1829
2286
2743
3048
3200
3658
4115
4572
inch
4
5
6
9
13
15
17
18
19
21
26
32
38
43
45
51
57
64
mm
110
140
160
220
320
390
430
450
490
540
650
810
970
1080
1140
1300
1460
1620
D
inch
-2
-2
-3
-3
-5
-6
-7
-7
-8
-9
-10
-13
-16
-17
-18
-21
-24
-26
mm
-50
-60
-70
-90
-130
-160
-180
-190
-200
-220
-270
-330
-400
-440
-460
-530
-600
-660
inch
-
29
35
48
72
87
96
101
109
121
145
182
218
243
255
291
328
365
mm
-
740
900
1210
1830
2200
2450
2570
2760
3070
3690
4620
5540
6160
6470
7400
8330
9260
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- -
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- inch
30
35
43
57
87
104
116
122
131
145
174
218
262
291
306
350
394
438
degree
-
10.3
10.2
10.1
10.1
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.0
9.9
9.9
9.9
degree
8.6
8.5
8.5
8.4
8.4
8.4
8.4
8.4
8.4
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
mm
750
900
1090
1460
2200
2650
2940
3090
3310
3690
4430
5540
6660
7400
7770
8890
10000
11120
Width Height wide tele wide tele
Screen Size C
α
B
Diagonal
inch
21
25
30
40
60
72
80
84
90
100
120
150
180
200
210
240
270
300
mm
533
635
762
1016
1524
1829
2032
2134
2286
2540
3048
3810
4572
5080
5334
6096
6858
7620
inch
17
20
24
32
48
58
64
67
72
80
96
120
144
160
168
192
216
240
mm
427
508
610
813
1219
1463
1626
1707
1829
2032
2438
3048
3658
4064
4267
4877
5486
6096
inch
13
15
18
24
36
43
48
50
54
60
72
90
108
120
126
144
162
180
mm
320
381
457
610
914
1097
1219
1280
1372
1524
1829
2286
2743
3048
3200
3658
4115
4572
inch
4
5
6
8
12
15
17
17
19
21
25
31
37
41
43
50
56
62
mm
110
130
160
210
310
380
420
440
470
520
630
790
940
1050
1100
1260
1410
1570
D
inch
-2
-2
-3
-4
-6
-7
-8
-8
-8
-9
-11
-14
-17
-19
-20
-23
-25
-28
mm
-50
-60
-70
-100
-140
-170
-190
-200
-210
-240
-290
-360
-430
-480
-500
-570
-640
-710
inch
-
28
34
46
70
84
93
98
105
117
141
176
211
235
247
282
318
353
mm
-
720
870
1170
1770
2130
2370
2490
2670
2970
3570
4470
5370
5970
6270
7170
8070
8970
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- -
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
- inch
29
34
41
56
84
101
112
118
126
141
169
211
254
282
296
339
381
424
degree
-
10.3
10.2
10.1
10.1
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.0
10.0
9.9
9.9
9.9
degree
8.6
8.6
8.5
8.4
8.4
8.4
8.4
8.4
8.4
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
8.3
mm
730
870
1050
1410
2130
2560
2850
2990
3210
3570
4290
5370
6450
7170
7530
8610
9690
10770
Width Height wide tele wide tele
VT695