Abstract: The present invention is characterized by comprising: a test mirror that can be tilted along the X, Y, and Z axes; a first lens through which incident light and reflected light are transmitted; a second lens disposed along the reflected light; a first sensor that detects the movement of the test mirror; a first light source disposed perpendicular to the reflected light; a first beam splitter that forms the incident light and transmits the reflected light; a second beam splitter that reflects a part of the reflected light that has been transmitted through the first beam splitter and makes same incident on the second lens; a second sensor that receives the reflected light from the second beam splitter and detects tilt angles of the test mirror; a second light source that emits light toward the reference point; and a third sensor that detects a movement of the test mirror.

Abstract: A switched-mode power supply including a primary rectifying circuit connected to an AC power supply, a transformer connected to the primary rectifying circuit, a secondary rectifying circuit connected to the secondary side of the transformer, a voltage fluctuation detector for sensing fluctuation in the output voltage, a signal generator for generating switching signals in response to the fluctuation detector, a switching tansistor for shunting the transformer to ground in response to the switching signals, a protective circuit responsive to the output voltage for stopping any abnormal operation of the switching signal generator, and an auxiliary power circuit for supplying power to the switching signal generator and to the protective circuit.