Hand-held keyboard and display for dialogue with programmable machine

摘要

The keyboard terminal has a flat case (1) with a dialogue screen (12) at the top and a set of key contacts (32). The case has the key contacts fixed to the bottom. The edge of the case is formed to allow a flat key panel (22) to be slid in place from the end of the case opposite the display panel. The edges of the case are flexible so they clamp the key panel in place.The key panel is made of two parts with a base and a top sheet. The top sheet is marked with characters or symbols appropriate to the user or the application. The underside of the key panel carries conductors that make contact with the connectors in the base of the case when the key is pressed.