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 5-15
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, h owever, 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
4
1
2
3
d
D
c
C
A
a
B
b
Image 5-16
Scheimpflug adjustments
4 Free nut
1, 2 and 3
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
R59770495 DP2K-23B 30/04/2010
53
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