| 摘要 |
A portable data terminal includes a display unit 5, a key-input section 1, a key-analysis section 2 and a control unit 3. The key-input section includes a plurality of multi-contact key switches. Each of the plurality of multi-contact key switches has a plurality of contacts allocated to a plurality of switch states, and includes an elastic pillar portion, a conductor and the concentric-circular contacts on a substrate. The key-analysis section detects an operated one of the plurality of multi-contact key switches and detects the plurality of switch states of the operated key switch. The control unit controls a display on the display unit based on the detecting results analysed by the key-analysis section. |
