Pressure transducing platen for use in a signature identification or verification system

摘要: A pressure transducing apparatus which is responsive to the exerted by an individual when he signs his signature for generating A.C. electrical signal representative of characteristic variations in produced use a identification or verification system. The platen includes writing surface means positioned receiving individual's and has attached thereto rod member having upper non-magnetic portion rigidly bottom said lower magnetic moves along vertical axis response on surface. Three coils, each central hole therein, are so that resides within at least coils movement therein. second middle coil driven oscillator first third connected opposition other such changes position openings three will result differential signature.