| 摘要 |
PURPOSE:To reduce the thickness of this whole device by providing a small diameter primary light source body consisting of a cold cathode tube exactly or almost the same in its comparative tube diameter as the dimension of the depth of a secondary surface light source body. CONSTITUTION:The device is provided with one or plural laminated layers of thin planar secondary surface light source body 9 made of a transparent resin, and this small diameter primary light source body 15 consisting of this cold cathode tube exactly or almost the same in its comparative diameter as the dimension of the depth of the secondary surface light source body 9. Therefore, such a thin surface light source device can be obtained that the thickness is largely reduced as a whole in comparison with, e.g., one using a fluorescent tube. Moreover, since this reduction in thickness is based on the dimension of the depth of the secondary surface light source body and the small diameter primary light source body consisting of the cold cathode tube exactly or almost the same in its comparative tube diameter as the former dimension, each kind of this surface light sources, e.g., between about 2 cm to several mm can be obtained according to the reduction in the thickness of the secondary surface light source. |
