| 摘要 |
PURPOSE:To make a displaying part large, by interposing a small convex lens and a large convex lens between an illuminant and the collected flux end of a number of optical fibers having a display at the front end and increasing the number of optical fibers for receiving light. CONSTITUTION:A small convex lens 12 and a large convex lens 13 are arranged in front of an illuminant 6 such as LED at an interval (d). And a collected flux end 5b with a large diameter is arranged to face to the lens 13, in front of the lens 13 and the number of optical fibers is increased. Next, a display of larger letters and figures than conventional ones is set at the front end of the optical fibers 5 to make the signal lamp larger or make it more dense in order to easily look at it. Moreover, the interval (d) between the lens 12 and 13 is made to be the sum of respective focal lengths f1, f2. And the whole light collected by the lens 12 is diffused and transmitted to the lens 13 and the light of the illuminant 6 is received as parallel light on the collected flux end 5b having almost similar diameter to that of the lens 13. In this way, the display can be more easily watched without increase of electric power consumption and also the efficiency can be increased and a stable and sturdy structure can be obtained. |
