Elo TouchSystems E221 Manual descarregar pdf (Página 95)

2-18 Elo Entuitive Touchmonitor

The AccuTouch Touchscreen

The AccuTouch resistive touchscreen consists of a glass panel molded to the

precise shape of a display's face. A scratch-resistant, hard-coated plastic cover

sheet is suspended over the surface of the glass by less than one-thousandth of

an inch with tiny separator dots. The cover sheet may be clear for best image

clarity or have an antiglare finish. For optimum optical performance, the

touchscreen may be optically bonded to the cathode ray tube (CRT) face. See

figure 2-1 for details on the construction of an AccuTouch touchscreen.

The glass is coated with a transparent uniform resistive coating, and the cover

sheet has a conductive coating. With a light touch on the cover sheet, the

conductive inner surface of the plastic makes contact with the resistive coating

on the glass. There is an electrical drive connection to each of the four corners

of the resistive coating, and a pickup connection to the coating on the cover

sheet. When the proper DC voltages are applied to the drive connections, the

voltage at the pickup connection is proportional to the position of the touch.

Refer to the Elo web site, www.elotouch.com, for more information on how the

AccuTouch resistive touchscreen operates.

Figure 2.1

AccuTouch Touchscreen

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Elo TouchSystems E221 Manual Página 95