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5. Lenses & lens holder
5.7
Scheimp
fl
ug adjustment
What has to be done ?
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 lens
plane comes to the DMD plane the further the sharp focus plane will be. It can happen 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 know as Sheimp
fl
ug’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).
SC
R
E
EN
DMD
Lp1
Lp2
Fp1
Fp2
SC
R
E
EN
DMD
Lp3
Lp4
Fp3
Fp4
(Scheimpflug)
Image 5-16
The lens holder has three adjustment mechanisms. The
fi
rst mechanism allows to shift the lens back and forward, the second
mechanism allows to tilt the lens and the third mechanism allows to swing the lens. Note that all three adjustment mechanisms
stand in relation with each other. So, a change to one of them will also effect the adjustment result of the two others. Therefore,
all three adjustment points have to be alternately and repeatedly adjusted until the projected image is completely focused on the
screen.
Scheimp
fl
ug 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.
Necessary tools
•
3 mm Allen wrench.
•
5,5 mm nut driver or
fl
at screw driver.
•
White paper sheet.
How to set up the projector for lens holder adjustment?
1. Place the projector upon a stable pedestal in its
fi
nal location.
2. Remove the front cover, side cover and top cover of the projector.
3. Switch on the projector and project the internal green focus pattern.
4. Focus the projected image as sharp as possible upon the screen.
How to adjust the lens holder?
1. Loosen (not remove) the following lock screws of the lens holder adjustment mechanism using a 3 mm Allen wrench:
a) The three screws of the lens holder front plate. Note that the three retaining springs of the lens holder plate are not strong
enough to keep some heavy lenses into position while adjusting the lens holder. If this is the case you have to fasten these
screws immediately after adjusting the focus shift plate.
b) The two screws of the lens holder tilt mechanism.
c) The two screws of the lens holder swing mechanism.
R59770242 DP-1200 06/01/2009
53
Summary of Contents for DP-1200
Page 1: ...DP 1200 Installation manual R59770242 02 06 01 2009 ...
Page 12: ...1 Safety 8 R59770242 DP 1200 06 01 2009 ...
Page 20: ...2 General 16 R59770242 DP 1200 06 01 2009 ...
Page 29: ...3 Physical Installation 1 2 3 5 4 7 6 Image 3 11 R59770242 DP 1200 06 01 2009 25 ...
Page 60: ...5 Lenses lens holder 56 R59770242 DP 1200 06 01 2009 ...
Page 78: ...8 Starting up 74 R59770242 DP 1200 06 01 2009 ...
Page 86: ...9 Projector registration Image 9 9 Add new owner 82 R59770242 DP 1200 06 01 2009 ...
Page 104: ...10 Removal and installation of projector covers 100 R59770242 DP 1200 06 01 2009 ...
Page 128: ...A Specifications 124 R59770242 DP 1200 06 01 2009 ...
Page 129: ...B Order Info B ORDER INFO Overview Spare part order info R59770242 DP 1200 06 01 2009 125 ...