5. Lenses & lens holder
5.7 Scheimpflug adjustment
What has to be done ?
The lens holder has to be adjus ted so that the “sharp f ocus plane” of the projected image falls together with the plane o f the screen
(Fp1→Fp2). This is achieved by changing the distance between the DMD plane and the lens plane (Lp1→Lp2). The closer the lens
plane comes to the DMD plane the further the shar p focus plane will be. It can sometimes happen th at you won’t be able to get a
complete focused ima ge on the screen due to a tilt (or swing) of the lens plane with respect to the DM D plane. This is also known
as Sheimpflug’s law. To solve this the lens plane must be placed parallel with the DMD plane. T his can b e achieved by turning the
lens holder to rem ove the tilt (or swing) between lens plane and DM D plane (Lp3→Lp4).
SCREEN
DMD
Lp1
Lp2
Fp1
Fp2
SCREEN
DMD
Lp3
Lp4
Fp3
Fp4
(Scheimpf lug)
Image 5-16
Scheimpflug principle
Scheimpflug principle
The "plane of sharp focus" can be changed so that any plane can be brought into sharp focus. W hen the DM D plane
and lens plane are parallel, the plane of sharp focus will also be par allel to these two planes. If, however, the lens
plane is tilted with respect to the DMD plane, the plane of sharp focus will also be tilted according to geom etrical and
optical properties. T he DMD plane, the principal lens plane and the sharp focus plane will intersect in a line be low the
projector for downward lens tilt.
Scheimpflug adjustment points
1
2
3
4
a
A
d
D
B
b
C
c
Image 5-17
Scheimpflug adjustments
1 Free nut
2, 3 and 4
Scheimpflug adjustment nuts
A, B, C and D Set screws
a, b, c and d lock nuts
Necessary tools
• Allenkey3mm
• Nut driver 13 mm
• Nut driver 10 mm
R59770351 DP2K-20C 02/02/2010
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