| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an illumination system which effectively improves the visibility of an operating part of a device during working in a dark place, has a simple structure, is preferable from the viewpoint of production cost and does not cause problems for surroundings. SOLUTION: A display part consisting of a fluorescent material is formed as the surface or on the surface of the operating part of the device. The display part is irradiated with light from a short wavelength LED to display by fluorescent light.</p> |
