Barco UDX 4K22, Руководство по установке

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R5906113 UDX 07/07/2017 45
4. Lenses & Lens selection
Lp1
Lp2
4.5 Scheimpflug adjustment
What is Scheimpflug?
The lens holder has to be adjusted so that the “sharp focus plane” of the projected image falls together with the plane of the screen
(Fp1→Fp2). This is achieved by changing the distance between the DMD plane and the lens plane (Lp1→Lp2). The closer the le
ns
plane comes to the DMD plane the further the sharp focus plane will be. It can occur that you won’t be able to get a complete focused
image on the screen due to a tilt (or swing) of the lens plane with respect to the DMD plane. This is also known as Scheimpflug’s
law. To solve this the lens plane must be placed parallel with the DMD plane. This can be achieved by turning the lens holder to
remove the tilt (or swing) between lens plane and DMD plane
(Lp3→Lp4).
Fp1
Fp2
DMD
Image 4-17
Scheimpflug principle
Scheimpflug principle
The "plane of sharp focus" can be changed so that any plane can be brought into sharp focus. When the DMD plane
and lens plane are parallel, the plane of sharp focus will also be parallel 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 geometrical and
optical properties. The DMD plane, the principal lens plane and the sharp focus plane will intersect in a line below the
projector for downward lens tilt.
Scheimpflug adjustment points
Image 4-18
Scheimpflug adjustments
Indication on drawing Function
1, 2 and 3 Scheimpflug adjustment screws
A, B and C Lock screws
1, 2 and 3 are adjustment points.
Necessary tools
• Allen wrench 5 mm
• Allen wrench 8 mm
Preparation steps:
1. Project a green focus test pattern in 4k.
A B
1 2
3 C
Fp4
DMD
Lp3
Lp4 Fp3
(Scheimpflug)
S
C
R
E
EN
S
C
R
E
EN