MEASURING INSTRUMENT WITH WATER LEVEL, A DESIGN PATTERN, A PROJECTION LIGHT, A TFT SENSOR, A CPU, A PROJECTION LIGHT DRIVING SECTION, A SENSOR CONTROL UNIT, A SENSOR OUTPUT SECTION, A CLICK SWITCH AND A DISPLAY FOR HORIZONTAL ANGLE WITH TFT SENSOR

摘要

PURPOSE: A horizontal angle measuring apparatus by using a TFT sensor is provided to generate distortion of a design pattern by coupling the TFT sensor to a projection light, a design pattern, and a water level. CONSTITUTION: A horizontal angle measuring apparatus includes a water level, a design pattern, a projection light, a TFT sensor, a CPU, a projection light driving section(21), a sensor control unit(22), a sensor output section(23), a click switch(24) and a display(25). The water level is made from transparent glass or a plastic material. A predetermined portion of the water level making contact with a water surface is formed as a polygonal column shape. The CPU controls the projection light driving section(21) and the sensor control unit(22).