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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 5-13
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.
R59770091 DP-1500 06/01/2009
41
Summary of Contents for DP-1500
Page 1: ...DP 1500 Installation manual R59770091 06 06 01 2009 ...
Page 14: ...1 Operating conditions 10 R59770091 DP 1500 06 01 2009 ...
Page 32: ...3 Mechanical set up of the DP 1500 28 R59770091 DP 1500 06 01 2009 ...
Page 48: ...5 Lenses lens holder 44 R59770091 DP 1500 06 01 2009 ...
Page 66: ...6 Lamp lamp house 62 R59770091 DP 1500 06 01 2009 ...
Page 84: ...9 Starting up 80 R59770091 DP 1500 06 01 2009 ...
Page 92: ...10 Projector registration Image 10 9 Add new owner 88 R59770091 DP 1500 06 01 2009 ...
Page 126: ...12 Servicing 122 R59770091 DP 1500 06 01 2009 ...
Page 142: ...13 Removal and installation of projector covers 138 R59770091 DP 1500 06 01 2009 ...
Page 143: ...A Specifications A SPECIFICATIONS R59770091 DP 1500 06 01 2009 139 ...
Page 144: ...A Specifications 140 R59770091 DP 1500 06 01 2009 ...
Page 146: ...A Specifications 142 R59770091 DP 1500 06 01 2009 ...
Page 154: ...C Pin configurations 150 R59770091 DP 1500 06 01 2009 ...
Page 155: ...D Order info D ORDER INFO R59770091 DP 1500 06 01 2009 151 ...
Page 156: ...D Order info 152 R59770091 DP 1500 06 01 2009 ...
Page 158: ...D Order info 154 R59770091 DP 1500 06 01 2009 ...