| 摘要 |
A novel identification device permits its holder to prove his authority as holder thereof so as to largely prevent its abusive use. The said identification device consists of a handy small housing (1) comprising permanent storage means (10) with an alphanumerical character string forming a code stored therein, further input means, a word register (9) for entering an alphanumerical character string by means of the input means, a comparator (11) having connected to its inputs the permanent storage means (10) and the word register (9), and display means connected to the comparator (11) for indicating the existing or missing conformity of the two character strings as determined by the comparator. A first time function element equipped with interlocking means which at the end of a predetermined first period of time supplies an interlocking signal preventing the conformity, if existing, to be displayed, may serve to limit a period of validity of the identification device. The word register (9) may be coupled also to a certain time function element which serves to erase the content of the word register at the end of a second predetermined, relatively short period of time so as to prevent any abuse which may otherwise result from the fact that the display of an existing conformity is retained for an unlimited period of time.
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