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How to adjust the lens (continued)
Lens adjustment to compensate for uneven screen focus
About the focus balance
Relationship between lens orientation and screen focus
z
If the projection lens is tilted with respect to the plane of the screen, uneven focus will result.
Figure 1: Illustration of influence of lens orientation
Projection lens
Image formation surface (DMD image plane)
Screen surface versus focal point
Procedure for adjusting the focus balance (tilt compensation in the lens
mount)
Three focus adjustment screws on the lens mount may be used to compensate for uneven screen focus.
Structure of lens mount (Figure 2, Figure 3)
z
The three adjustment screws allow the lens to be tilted up and down, and three more screws lock down the
adjustment.
Figure 2 : Front view of lens mount (when viewed from screen side)
a
cb
Locking screwLens bracket
(Adjust the focus adjustment screws a, b and c after installing the lens.)
Figure 3 : Cross section view of the lens mount
Lens tilt direction
(when adjustment screws
turned counterclockwise)
Lens bracket Adjustment
screw
Hole for Allen hex socket driver Spring
Lens flangeLocking screw
Screen direction