Nec MT820, MT1020 Installation Data

Visual Systems Division Technical Bulletin

MultiSync MT820/MT1020 Installation Data

Desk Top and Ceiling Mount

Contents

Notes and Formulas Page 1 Projection Distances and Screen Sizes

Ceiling Mount (Lens Wide) Page 2 Ceiling Mount (Lens Telephoto) Page 3 Desktop Setup (Lens Wide) Page 4

Desktop Setup (Lens Telephoto) Page 5 Cabinet Dimensions Page 6 Ceiling Mount Dimensions Page 7

Notes `

§ For Screen Sizes of 60 to 300 inches not indicated on the projection tables, use the formulas below.

§ Set the projection distance based on the width of the screen.

§ If the figures on the tables do not match the figures in the formulas, use the figures in the table.

Formulas

Units: Inches Units: Millimeters

M = 1.25 x W / 33.02 M = 1.25 x W / 1.3 A = C / COSINE α A = C / COSINE α B = (8 x M) + 5.598 B = (8 x M) + 142.2 C (Zoom Wide) = (53.2 x M) - 3.37 C (Zoom Wide) = (53.2 x M) - 85.609 C (Zoom Telephoto) = C (Zoom Wide) x 1.3055 C (Zoom Telephoto) = C (Zoom Wide) x 1.3055 D = (3 x W / 8) - E D = 25.4 x (3 x W / 8) - E E = (8 x M) + 3.433 E = (8 x M) + 87.2

αα = TAN -1 ((E - 3.433) / C) αα = TAN -1 ((E - 87.2) / C)

W = Width of Screen

A = Distance between lens center and screen center B = Vertical distance between top of NEC ceiling mount and screen center C = Horizontal throw distance between screen surface and projector lens D = Vertical distance between projector base and screen bottom E = Vertical distance between desk top level and screen center

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Visual Systems Division

MultiSync MT

Technical Bulletin

MultiSync MT820/MT1020 Installation Data

Desk Top and Ceiling Mount

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.

Ceiling Mount System

6.93"C

Horizontal

Lens

Offset

4.38"

1020

Screen Center

Zoom Lens (Wide)

α degree 8.86 8.81 8.77 8.75 8.73 8.70 8.67 8.65 8.64 8.63 8.62 8.61

α) 0.1539 0.1531 0.1525 0.1521 0.1518 0.1513 0.1508 0.1504 0.1503 0.1500 0.1499 0.1497

(=sin

(=cosα)

Screen Width inch 48 56 64 72 80 96 120 144 160 192 216 240

Diagonal (4:3) inch 60 70 80 90 100 120 150 180 200 240 270 300

A inch 94.4 110.8 127.1 143.4 159.6 192.1 241.1 289.9 322.5 387.7 436.5 485.4

0.9881 0.9882 0.9883 0.9884 0.9884 0.9885 0.9886 0.9886 0.9886 0.9887 0.9887 0.9887

mm 2398.6 2813.2 3227.8 3642.4 4053.0 4880.2 6123.0 7362.8 8191.0 9846.4 11086.2 12329.0

B inch 20.1 22.6 25.0 27.4 29.8 34.7 41.9 49.2 54.1 63.7 71.0 78.3

mm 511.4 573.0 634.5 696.0 757.6 880.7 1065.3 1249.9 1373.0 1619.1 1803.7 1988.4

C inch 93.3 109.4 125.6 141.7 157.7 189.9 238.3 286.6 318.8 383.3 431.5 479.9

mm 2370 2780 3190 3600 4006 4824 6053 7279 8098 9735 10961 12190

D inch 0.0 0.6 1.2 1.7 2.3 3.5 5.2 6.9 8.1 10.4 12.1 13.8

mm 0.5 15.1 29.7 44.3 59.0 88.2 132.0 175.9 205.1 263.6 307.4 351.3

Note:

For screen sizes of 60 to 300 inches not indicated on the projection tables, use the formulas on page 1. All calculations are with the lens (Wide setting).

Page2

Visual Systems Division

MultiSync MT

Technical Bulletin

MultiSync MT820/MT1020 Installation Data

Desk Top and Ceiling Mount

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.

Ceiling Mount System

6.93"C

Horizontal

Lens

Offset

4.38"

1020

Screen Center

Zoom Lens (Telephoto)

α degree 6.78 6.75 6.73 6.72 6.71 6.69 6.67 6.66 6.65 6.64 6.64 6.63

α) 0.1181 0.1176 0.1172 0.1170 0.1168 0.1165 0.1162 0.1160 0.1159 0.1157 0.1156 0.1155

(=sin

(=cosα)

Screen Width inch 48 56 64 72 80 96 120 144 160 192 216 240

Diagonal (4:3) inch 60 70 80 90 100 120 150 180 200 240 270 300

A inch 123.1 144.2 165.3 186.3 207.4 249.6 312.8 376.1 418.2 502.5 565.8 629.1

0.9930 0.9931 0.9931 0.9931 0.9932 0.9932 0.9932 0.9933 0.9933 0.9933 0.9933 0.9933

mm 3126.9 3663.4 4199.0 4732.5 5269.1 6339.2 7945.8 9552.4 10622.5 12764.7 14371.4 15979.0

B inch 20.1 22.6 25.0 27.4 29.8 34.7 41.9 49.2 54.1 63.7 71.0 78.3

mm 511.4 573.0 634.5 696.0 757.6 880.7 1065.3 1249.9 1373.0 1619.1 1803.7 1988.4

C inch 122.2 143.2 164.2 185.0 206.0 247.9 310.7 373.5 415.4 499.2 562.0 624.9

mm 3105 3638 4170 4700 5233 6296 7892 9488 10551 12679 14275 15872

D inch 0.0 0.6 1.2 1.7 2.3 3.5 5.2 6.9 8.1 10.4 12.1 13.8

mm 0.5 15.1 29.7 44.3 59.0 88.2 132.0 175.9 205.1 263.6 307.4 351.3

Note:

For screen sizes of 60 to 300 inches not indicated on the projection tables, use the formulas on page 1. All calculations are with the lens (Telephoto setting)

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