NEC MultiSync LT140 Installation and user guide

Visual Systems Division

Technical Bulletin

MultiSyncLT140 Installation Data

Desktop and Ceiling Mount

Page1

Contents

Notes and Formulas Page 1

Projection Distances and Screen Sizes

Desktop Setup Page 2

Ceiling Mount Page 3

Cabinet Dimensions Page 4

Notes

§For Screen Sizes of 25 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.

§All dimensions are in inches. Multiply by 25.4 for millimeters.

§Distances may vary +/- 5%.

Formulas

Units: Inches

A= C / COS αH= Screen Diagonal (4:3) x 4 / 5

B= 3.7H / 25.4 H= Screen Width

C (WIDE) = (2.0099 x H) – 1.9927

C (TELE) = (2.4119 x H) – 2.0365

D= E/2

E = H / 4 x 3

αα= TAN -1 ((H x 0.375) + B) / C

A= Distance between lens center and screen center

B= Vertical distance between lens center and screen bottom (screen top for ceiling mount)

C= Horizontal throw distance between screen surface and projector lens

D = Vertical distance between screen center and screen bottom (screen top for ceiling mount)

E =Screen Height

αα= Offset Angle of image path center line with reference to desktop or ceiling

Visual Systems Division

Technical Bulletin

MultiSyncLT140 Installation Data

Desktop and Ceiling Mount

Page2

Projection Distance and Screen Size for Desktop

The following diagram shows the relationship between projector position and the screen.

Desktop

VIDEOPC CONTROL

L(MONO)R

AUDIORGB INPUTMOUSE OUT•¥ •¥ ACCESSUSB PC CARD

S-VIDEO•¥ 1.99"

Screen Center

Screen Bottom

Screen

αα

Distance Chart Screen Size A B C αα

Diagonal Width (H) Height (E) wide - tele wide - tele wide - tele

40" 32" 24" 64.4" - 77.0" 4.7" 62.2" - 75.2" 15.0° - 12.5°

60" 48" 36" 97.7" - 116.5" 7.0" 94.5" - 113.8" 14.8° - 12.4°

67" 53.6" 40.2" 109.3" - 130.2" 7.8" 105.7" - 127.2" 14.8° - 12.4°

72" 57.6" 43.2" 117.7" - 140.2" 8.4" 113.8" - 136.9" 14.8° - 12.4°

84" 67.2" 50.4" 137.6" - 163.7" 9.8" 133.1" - 160.0" 14.7° - 12.3°

90" 72" 54" 147.5" - 175.6" 10.5" 142.7" - 171.6" 14.7° - 12.3°

100" 80" 60" 164.1" - 195.4" 11.7" 158.7" - 190.9" 14.7° - 12.3°

120" 96" 72" 197.3" - 234.9" 14.0" 190.9" - 229.5" 14.7° - 12.3°

150" 120" 90" 247.4" - 294.1" 17.5" 239.4" - 287.4" 14.6° - 12.3°

180" 144" 108" 297.0" - 353.3" 21.0" 287.4" - 345.3" 14.6° - 12.2°

210" 168" 126" 346.9" - 412.5" 24.5" 335.7" - 403.2" 14.6° - 12.2°

240" 192" 144" 396.7" - 471.6" 28.0" 383.9" - 461.0" 14.6° - 12.2°

270" 216" 162" 446.5" - 530.9" 31.5" 432.1" - 518.9" 14.6° - 12.2°

300" 240" 180" 496.3" - No Tele 35.0" 480.3" - No Tele 14.6° - No Tele

Note:

For screen sizes of 25 to 300 inches not indicated on the projection tables, use the formulas on page 1.

Visual Systems Division

Technical Bulletin

MultiSyncLT140 Installation Data

Desktop and Ceiling Mount

Page3

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

Screen Center

Screen

1.99"

Projector Base

Screen Top