| 摘要 |
PURPOSE:To reduce power consumption and to make maintenance easy by disposing optical fibers opposing to the transparent dots forming display numerals provided to an opaque board and providing optical switches on the way of optical fibers and a light source and a reflecting body at the other end of said fibers. CONSTITUTION:An opaque front board 1 of a display device TD is formed by dot groups A, B and a dot group C expressing M (meter) and optical fibers 3-1- 3-n are provided opposing to these transparent dots 2, and optical switches 8-1-8-n which are controlled selectively by a controlling circuit 9 are disposed on the way of the optical fibers and a light source 5 and a reflecting body 6 are provided to the other end side of said fibers. The optical switches 8-1-8-n are controlled selectively by a measuring signal from a water gauge or tidal gauge 10 and the water or tidal level is displayed as e.g. 07M (as shown by black dots). Consequently said device reduces its power consumption as compared to lamps arranged like dots and simplifies its maintenance becuase only one light source is used. |
