Patent ID: 9438591
Filing Date: 2016-09-06
CPC Classification: G06F,G06K,H04L

Claim Text:
1. A biometric authentication device comprising: a function device which executes a predetermined function; a biometric information acquisition device which acquires biometric information of a user; a distance measurement device which measures a distance to the user to output a measured value of the distance; a storage device which stores data representing biometric information of a registrant; a processor configured to: wherein the determination result allowing or not allowing the use of the predetermined function allows the use of the predetermined function when a trajectory of the temporal change of the measured value of the distance after the user has been authenticated reaches within an activation range without the trajectory deviating from a predetermined tolerable range, and wherein the predetermined tolerable range shifts to become closer to the activation range in response to an elapsed time from a time when the user has been authenticated.