Abstract: A biometric information authentication device includes a control unit to, during biometric authentication by comparing biometric information of a user read by a biometric information sensor to preliminarily registered biometric information of a registered person, issue a notification to encourage the user to register different biometric information when a predetermined condition for determining that a biometric authentication after a current biometric authentication is highly likely to fail is met.

Abstract: A biometric information authenticating device includes a biometric information sensor to detect contact of an operating finger with a reading surface and to read biometric information of the operating finger, an illumination unit including at least one light source, and a control unit to indicate completion of reading of the biometric information by an illumination pattern including a combination of turning on and off of the at least one light source.

Abstract: There is provided a slider displacement direction conversion mechanism in an electrostatic actuator which can convert the displacement direction of a slider in the perpendicular direction to a substrate surface, the mechanism comprises a slider which is displaced under the force from the electrostatic actuator generating the electrostatic force parallel to the substrate surface, and a plurality of elastic beams fixed to a substrate which supports the slider, the elastic beams are entirely or locally provided with displaceable members supporting the slider, and the displaceable member is easily displaced in the direction different from the displacement direction when the slider is subjected to the force in the displacement direction.

Abstract: There is provided a slider displacement direction conversion mechanism in an electrostatic actuator which can convert the displacement direction of a slider in the perpendicular direction to a substrate surface, the mechanism comprises a slider which is displaced under the force from the electrostatic actuator generating the electrostatic force parallel to the substrate surface, and a plurality of elastic beams fixed to a substrate which supports the slider, the elastic beams are entirely or locally provided with displaceable members supporting the slider, and the displaceable member is easily displaced in the direction different from the displacement direction when the slider is subjected to the force in the displacement direction.