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2-19
Use two layers of the double-sided adhesive tape to achieve a total thickness
of 1/16-inch (2 mm). While specific touchscreen and CRT combinations may
allow the use of thinner materials, 1/16-inch (2 mm) is generally necessary to
allow for variations in ROC between the two glass surfaces. Review the fit
between the touchscreen and the CRT before applying the tape. If one pair of
opposite edges has a closer fit than the other, put the adhesive tape on the
edges of the touchscreen with the better fit. See Figure 2.4 on page 19 for
typical placement. You want the sealing tape on the rear of the touchscreen
so it can’t be seen in the viewable area once reassembled. If there is a good fit
on all four edges, you may want to use double-sided adhesive tape on all four
edges. When doing this, move the adhesive tape in slightly on one pair of
edges and add foam sealing tape outside these two edges. The thicker foam
tape will keep the adhesive tape away from the CRT until you are ready to
adhere the touchscreen to the display.
Figure 2.4
Proper placement of adhesive tape to the touchscreen.
In general, the adhesive tape should be set back slightly from the edge of the
active area of the touchscreen. The adhesive tape should be attached to the
glass. When the display is reassembled, the mounting tape should not be
visible. Do not remove the liner from the exposed side of the adhesive tape
yet.
Cut and place the foam sealing tape on the back of the touchscreen to form a
dust seal as shown in Figure on page 31. This seal is particularly important
because the CRT is a good electrostatic precipitator and will attract dust. The
adhesive tape and foam sealing tape should form a complete seal around the
touchscreen. Do not leave any gaps. The sealing tape should not be visible
when the display is reassembled.
Practice aligning the touchscreen on the CRT without removing the adhesive
tape liner. The installation can tolerate some horizontal and vertical shift.
However, rotational skew between the touchscreen and display axes cannot
be easily compensated for in the video alignment, and will also interfere with
proper mounting of the tube in the bezel.