| 摘要 |
PROBLEM TO BE SOLVED: To solve the problems wherein a conventional structure of a push button switch for a vending machine adopting a plurality of light sources such as LED lamps, uses many light sources for illuminating a lens surface evenly to cause an increase in cost and power consumption, and is subject to a gap in a sealed portion to cause intrusion of rainwater and the like. SOLUTION: A push button switch 1 for a vending machine comprises an emission unit 5 having light sources 2 and a prism sheet 24 arranged in front of the light sources 2, in which the prism sheet comprises first prism lens lines of many substantially cylindrical polyhedral prism lens lines 3a, and many second similarly substantially cylindrical prism lens lines 4a, which are orthogonal to each other. A plurality of bright points are formed not only just over the LED light sources but also at peripheral prism lens intersections. COPYRIGHT: (C)2006,JPO&NCIPI
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