R5905753 /17 DPxK-19B/23B/P70
6. Zoom the lens for minimum image on the screen (TELE) and focus the center of the projected image using
the motorized focus control (Local Keypad).
Image 5–20
7. Is it possible to focus the center of the projected image using the motorized focus control (Local Keypad) ?
Ensure that the lens is zoomed for minimum image on the screen (TELE).
► If yes, no further adjustment actions required. Proceed with step 8.
► If no, obtain the best possible focus in the center of the projected image using the motorized focus
control and then turn the three Scheimpflug adjustment nuts, reference 1, 2 and 3 Image 5–21, equally in
or out until the center of the projected image is sharp. Note: the same turning direction as in step 5 is
applicable.
Image 5–21
8. Check if it is possible to focus the center of the projected image using the motorized focus control (Local
Keypad) for WIDE and for TELE.
► If yes, the Back Focal Length is correctly adjusted.
► If no, repeat with step 4.
9. Is the projected image in the corners as sharp as in the middle?
► If yes, proceed with the procedure “Fixation of the Lens Holder front plate”, page 74.
► If no, Scheimpflug adjustment is required. See procedure “Scheimpflug adjustment”, page 70, prior to
fixate the Lens Holder front plate. CAUTION: Skip the action, in the Scheimpflug adjustment procedure, to
turn the three Scheimpflug adjustment nuts until the front of the nut is equally aligned with the front of the
threaded rod!
5.7 Scheimpflug 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 sometimes 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 known as Sheimpflug'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).
Lenses & lens holder
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