| 摘要 |
This invention has an object to provide an illumination device capable of selecting freely the contour of the light emitting portions and the light distribution feature according to the shape of the institution installed with this device and to user's desires, suppressing light brightness differences as well as light intensity profile differences due to viewing angle upon improving the light outputting efficiency, and being manufactured with lower costs. The invented illumination device includes plural light guide plates formed with reflection dots reflecting a shape of processing dots by pressing the matrix shaped processing dots provided at an ultrasound processing horn, an LED light source for rendering LED light enter into the light guide plates, and a holding member for holding the LED light source, wherein the plural light guide plates are arranged to have a major surface having the reflection dots to be angled differently. |
