| 摘要 |
PURPOSE:To enable all LED images to be focused clearly and with uniform density, by a method wherein an end face light-emitting type LED array is used, and a surface of a focusing system is fixed to a surface parallel with an adhesion surface of a LED array chip. CONSTITUTION:A height-adjusting plate 901 for a self-focusing lens array 401 is adjusted so that a light-emitting surface of each LED on a LED array chip 605n is located at the center of the pile of focusing rod lenses of the lens array 401. Then, a base 902, the lens array 401, the adjusting plate 901 and a LED array substrate 602 are fixed by adjusting the conjugate points. Accordingly, by using the end face light-emitting type LED array chip as a bright spot generator for forming an image and fixing a surface of the focusing system such as the selfoc lens array to a surface parallel with the adhesion surface of the LED array chip, the deviation of the light-emitting surface from the center of the pile of the focusing rod lenses of the lens array can be reduced over the entire part of a line. |
