SVD 800 HD
4.3.3 Desktop rear projection
For rear projection we recommend installing the projector with the axis of the green lens orthogonal to the screen plane; pay attention that the green lens be centered with respect to the screen (see: par. 4.6, Projector Centering page 23).
SCREEN
SCREEN CENTRE | 14° |
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C
Fig. 44
-If the measurement of the screen diagonal is not in the table, C can be determined (in cm) as follows.
-Measure the screen diagonal and take the nearest value from the table.
-Calculate the ratio between value C and screen width in the table.
-Multiply the result by the actual screen width.
Example: Suppose we have a 105” screen diagonal. 100” is the nearest value in the table.
The A/Width ratio is equal to 299/203.2=1.471 A105” screen diagonal is 213.3 wide
So, the value of A is: 1.471x213.3=313.7 cm.
Note: For 16/9 screen formats, measure the width and refer to the nearest width value in the table.
4.3.4 Ceiling front projection
By using Fresnel lenses for rear projection, it is mandatory to install the projector orthogonal to the centre of the screen to achieve maximum brightness and a better per- formance.
The distance between projector and screen is given in the following table.
TABLE 2: DESKTOP REAR PROJECTION
C = Distance between the front panel and the screen.
SCREEN SIZE |
| C | |
USEFUL AREA 4/3 |
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Diagonal | Width | Height |
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(Inches) | (cm.) | (cm.) | (cm.) |
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60” | 121.9 | 91.4 | 188 |
80” | 162.5 | 121.9 | 243 |
90” | 182.9 | 137.2 | 271 |
100” | 203.2 | 152.4 | 299 |
120” | 243.8 | 182.9 | 355 |
150” | 304.8 | 228.6 | 439 |
180” | 365.7 | 274.3 | 522 |
200” | 406.4 | 304.8 | 578 |
250” | 508.0 | 381.0 | 718 |
300” | 609.6 | 457.2 | 857 |
Use the ceiling assembly kit (given with the projector) to install the projector on the ceiling and proceed as follows:
To attach the projector to a solid concrete block ceiling or brick ceiling drill 12mm dia. holes 65mm deep. Attach on the ceiling the big bracket included in the package using the four concrete anchors provided together with screws and washers, USING the outer holes on the bracket, and tighten to 25 Nm maximum torque.
WARNING:
The installer must verify that the wall can support four times the full load (mounting bracket, hardware and electronics), the minimum thickness of the wall support has to be 10 cm.
For concrete blocks and brick walls, do not drill mounting holes into mortar joints, the distance between anchor and free edge of the support wall has to be more than 18 cm.
The bracket must be fixed very carefully.
440 | 93 | 180 |
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WALL |
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| 115 |
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550 |
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| 266 | Fig. 45 |
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| 18 |
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