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9
3M Multimedia Projector MP8020
1996
Projector to Viewing Screen Alignment
The size of the projection screen and the distance of the projector to the screen are important considerations for
determining the best placement of the projector. After the best projector to screen distance has been
determined, the position of the projection screen in relation to the center of the projection lens must be
considered.
90°
Figure 3-14. Top View
b
a
a = Distance to viewing screen
b = Center of lens to bottom of
projected image
90°
Figure 3-15. Side View
Measured from the center of the projection lens (Figure 3-14), the projected image should be split equally left
to right. For best results, rotate the projector until the image on the projection screen is perpendicular (90°)
from the lens.
Measured from the center of the projection lens, the top to bottom projected image (Figure 3-15) is projected
with most of the image above the center of the lens and a small amount below the center of the lens. The
position of the projected image to the center of the lens is an important consideration for the vertical placement
of the projection screen.
Use the table below to calculate the approximate distance (refer to “b” in Figure 3-15) from the center of the
lens to the bottom of the projected image. Both normal and ceiling mount applications are affected by this
distance.
a
b
Screen
Minimum Maximum
b
102 cm (40 in.) 137 cm (53 in.) 223 cm (87 in.) 8 cm (3 in.)
152 cm (59 in.) 209 cm (82 in.) 340 cm (133 in.) 13.2 cm (5 in.)
203 cm (79 in.) 282 cm (110 in.) 455 cm (177 in.) 17.5 cm (7 in.)
254 cm (99 in.) 353 cm (138 in.) 569 cm (222 in.) 22.1 cm (8.6 in.)
305 cm (119 in.) 427 cm (167 in.) 685 cm (267 in.) 26.4 cm (10 in.)
381 cm (149 in.) 533 cm (208 in.) 858 cm (335 in.) 33 cm (13 in.)
508 cm (198 in.) 714 cm 278 in.) 1149 cm (448 in.) 43 cm (17 in.)
11


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