| 摘要 |
A data entry system includes a keyboard which includes a panel of chemically toughened, laminated glass. The upper surface of the panel has a plurality of key areas respectively representative of different keys, and a plurality of LEDs are respectively positioned opposite the key areas adjacent the lower surface of the panel. Each LED has a photodiode associated therewith, each photodiode being arranged to receive infra-red light emitted by the associated LED, transmitted through the glass panel and reflected back from an operator's finger placed on the respective key area to operate that key. Output signals are produced in response to infra-red light reflected back to the photodiodes, and, in response to these signals, a microprocessor produces an output indicative of an operated key. The data entry system is suitable for use in a through-the-wall automated teller machine.
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