Patent ID: 6969142
Filing Date: 2005-11-29
Classification: B41J,Y10T

Abstract:
1. A method of detecting a fault condition in a micro-electromechanical device, the method comprising the steps of: applying at least one current pulse to an actuator of the device such that the actuator is cyclically displaced at least once; determining an extent of displacement of the actuator; calibrating the device by determining a relationship between an operational parameter and said displacement; and testing the device by applying said parameter to the device, such that an error is detectable where said relationship is not achieved; wherein the step of determining the extent of displacement of the actuator includes the step of generating an electrical signal when the actuator is displaced to said extent; and wherein the step of generating the electrical signal includes the step of establishing a switch that is operable upon displacement of the actuator to direct the current from the actuator to processing circuitry upon displacement of the actuator to said extent, such that a switch contact is positioned to correspond with said extent of displacement.