| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an lighting system configured so that an entire optical window is displayed only in one color corresponding to the liquid column and air part when observed from the facing position of a liquid level meter body, in the lighting system of a transmitted light liquid level meter for irradiating an illuminating light for transmission illumination to the body of the double color liquid level by which the liquid level is determined by displaying the liquid column and air part with different colors. <P>SOLUTION: Color filters for illuminating display with double color lights are disposed at the position where among the illumination light from a light source, lights passing a first and second light paths transmit through only the corresponding one filter part and pass through with a space from the boundary between the filters, wherein the first light path which transmits through the liquid column reaching the view position facing the liquid level and the second light path which transmits through the air part reaching the view position facing the liquid level do not overlap in the horizontal direction. <P>COPYRIGHT: (C)2009,JPO&INPIT |
