| 摘要 |
<p>There is provided an infrared sensor module. The present invention includes an infrared sensor configured to sense an object by radiating infrared rays; a piezoelectric actuator formed using dome-shaped piezoelectric elements, configured such that the polarization direction thereof is oriented toward the center of curvature thereof, and configured to repeat expansion and contraction in the direction of a normal line with respect to a dome vertex according to the waveform of an applied signal; a vibration shaft formed in a bar shape such that the one side thereof is fastened to the dome vertex of the piezoelectric actuator; a movable element coupled to the vibration shaft so as to be moved in an axial direction; a shading plate fastened to the movable element, located in front of the infrared sensor, and configured to alternately pass and block incident infrared rays; an oscillation unit configured to output square waves and apply the output square waves to the piezoelectric actuator; and a control unit configured to operate the piezoelectric actuator by controlling the oscillation unit in response to a signal read from the infrared sensor. In accordance with the present invention, the infrared sensor module has advantages in that it is constructed in a simple structure using a dome-shaped piezoelectric actuator, has a relatively large generated force, and can operate at low voltage.</p> |
