Multi-item selection keyboard unit
专利汇可以提供Multi-item selection keyboard unit专利检索，专利查询，专利分析的服务。并且PURPOSE: To obtain a keyboard unit which is easy to operate and can be miniaturized by providing an item sheet onto a kyboard panel to which the variation of static electricity is applied and by detecting a corresponding code from the surface of this sheet by a finger or special pen.
CONSTITUTION: On the surface of glass panel 3, transparent conduction film 4 is formed, which corresponds to depression keys, confronting to metal-film electrodes 1 and 2 obtained at fixed positions of its reverse surface by etching work. On its upper surface, time sheet 5 made of paper or film is placed and after its matrix is made to correspond to that of electrode 4, making a finger or tip 6 of a pen in contact with an indication item of sheet 5 changes electrostatic capacities between electrode 4 and electrodes 1 and 2. Those changes are converted into codes of digital signals after being amplified, and then sent to a controller. The keyboard operation board consists of the keyboard unit composed of control key part 7 and electrostatic-capacity change detection glass panel part A, and item-written sheet 5 is mounted on it and used.
COPYRIGHT: (C)1979,JPO&Japio，下面是Multi-item selection keyboard unit专利的具体信息内容。
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