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Data entry keyboard device

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专利汇可以提供Data entry keyboard device专利检索,专利查询,专利分析的服务。并且PURPOSE: To prevent an unpermitted entry to a keyboard by bringing about a pseudo key operation by a continuous random pattern of binary signals in two forms and disabling an unqualified person from distinguishing pure key operations and pseudo key operations from each other by tapping connection.
CONSTITUTION: A 6-bit random pattern generator 30 in a control circuit 16 has six output lines 40, 42, 44, 46, 48, and 50 and generates a group of random binary bit patterns to output lines at a high speed of about 1000 patterns/sec. Pure key entries are effectively concealed in response to different random patterns generated by the random pattern generator 30 to protect pseudo key entries in a high level, and it is extremely difficult to confirm the pure key entries. Thus, an unpermitted person is prevented from finding the operation keys by tapping of row and column conductors of the keyboard.
COPYRIGHT: (C)1990,JPO,下面是Data entry keyboard device专利的具体信息内容。

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