| 摘要 |
<p>PURPOSE:To stabilize an indication color at the time of adding and mixing colors irrespective of a visible position by making a unit of a translucent film smaller with respect to a diffusion step of an inner lens. CONSTITUTION:In an additive and mixture type color changing lamp, width of a chromatic translucent film 9 is made smaller than a half of a pitch P of a diffusion step 8 constructed in an inner lens. When incident external light S is reflected by the diffusion step 8 of the inner lens 5 while a lamp is unlit, probability that the light transmits through the translucent film 9 which is located in a large amount on a ridge 11 of the diffusion step 8 increases so that distribution of luminous intensity during normal operation can be increased. In addition since external light S incident to the ridge 11 is emitted by this reflection, dummy lighting is prevented and distribution of luminous intensity with high center brightness can be obtained so that preferable visibility from an upper or a side section as an indication lamp can be obtained.</p> |
