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(2) Considerations for projector installation
1) Positional relationship between projectors and screen
Install in parallel
Fig.2 (Plan view)
Projector can be
moved within the
range of the lens shift*
Fig.3 (Side view)
* The amount of lens shift varies by projector
model and the actual lens used. The specific
value should be checked with the specification.
For example, use of the full up-down shift
disables the left-right shift.
As shown in the plan view in Fig.2,
projectors need to be installed in
parallel with the screen surface.
When the installation is not in parallel,
the projected image causes trapezoid
distortion in the horizontal and vertical
directions, and the edge part of the
blended images generates a
white-out or dark shade. The linearity
of the entire image is also
deteriorated.
The blending width may be
determined freely but a wide band is
recommended for a smooth joint.
10% of the image width is
recommended. After determining the
blending width, each projector is
installed with its lens center aligned
with the screen center.
The lens always causes distortion.
The distortion is less near the center
of each lens. Distortion of a zoom
lens varies between the telescope
end and wide-angle end. Please
check with the sales personnel for
more details.
Fig.3 shows a conceptual installation
viewed from the side.
The projector should be installed with
the lens center aligned with the
center line of the screen.
In the case of front projection, the
projector is either placed on a table or
suspended from the ceiling
depending on the installation
environment. In either case,
installation is possible within the
range of the lens shift.
A slant installation that leads to the
range of lens shift being exceeded
requires trapezoidal correction. As
edge blending does not respond to
trapezoidal correction, a slant
installation is not acceptable.
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