Abstract: An input pen assembly is provided which selectively cooperates with the screen of a cathode ray tube of a CRT display and the tablet of a tablet input device. The assembly automatically activates either one of the CRT display and the tablet input device in response to a change in the magnitude of a pressure applied by the pen against the screen of the CRT or the tablet. The input pen assembly includes an electrode which has its one end projecting forwardly of the front end of a casing and which is used for detecting a signal from the tablet. The electrode is formed with a through-opening which defines a light transmission path for a signal from the CRT display. Additionally the input pen assembly includes a spring which resiliently biases the electrode so that its front end projects forwardly of the front end of the casing, and a movable member which is disposed for movement with the electrode when the latter is retracted against the resilience of the spring.

Abstract: A capacitively coupled tablet for use with an electrically conductive pen comprises segments each including at least one lattice point of a matrix which comprises groups of spaced conductors which are disposed along coordinate axes. The segments are mutually electrically isolated by an electrically conductive shield layer having apertures which correspond to the surface area of the respective segments, and are marked with corresponding characters to serve as keys. An electrically insulating layer is disposed between the shield layer and the groups of conductors, and a similar surface layer is disposed on the shield layer.