Keyboard encorder
专利汇可以提供Keyboard encorder专利检索，专利查询，专利分析的服务。并且PURPOSE: To enhance the operation assuredness and the operation tolerance (prevention of chattering) at the slow keying time by applying the low-cost key input unit using the analog output type Hall IC or the like.
CONSTITUTION: Matrix circuit 1 is formed by row lines X
0 WX
3 plus column lines Y
0 WY
3 , and 16 units of key input units K
00 WK
33 are connected at the intersections between these rows and columns. And these input units consist of the contractless switches using analog output type Hall IC 50. Unit K is generally consists of magnet 52 adhered to key 51, Hall device 53 opposing to magnet 52, differential amplifier 54 to amplify the output of device 53, output transistor 55 connected in the open emitter form, and others. When key 51 is at the prescrived position shown in the figures, the magnetic field of magnet 52 is applied in the direction of arrow (a) to device 53. And the effective magnetic field becomes zero at a certain position as key 51 is pressed. With further press of key 51, the magnetic field of megnet 52 affects in the direction of arrow (b) and becomes maximum with the key pressed down to the lower limit position.
COPYRIGHT: (C)1980,JPO&Japio，下面是Keyboard encorder专利的具体信息内容。
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