| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light source positioning structure for realizing positioning accuracy of an LED and a light guiding plate, by butting the light guiding plate against a flexible substrate. <P>SOLUTION: This light source positioning structure of a keyboard unit for the back light includes the light guiding plate 4, a spotted light source (LED) 7 and the flexible substrate 5. The light guiding plate 4 includes a plurality of projections 10 and recessed parts on an end surface on the light incident surface side. The flexible substrate 5 includes a plurality of slits 15 arranged in response to the plurality of projections 10, the LED 7 arranged between the slits or in parallel to the slits 15, and an adhesive member formed in an overlapping part of the flexible substrate 5 and the light guiding plate 4. The respective projections 10 are inserted into the slits arranged on the flexible substrate 5. The light guiding plate 4 is fixed to the flexible substrate 5 so that a distance up to a light incident surface of the light guiding plate 4 from a light emitting surface of the spotted light source 7, becomes a proper distance regulated in a minimum tolerance range, in a position for butting a peripheral edge part of the slits 15 against a base end part outside surface of the projections 10. <P>COPYRIGHT: (C)2010,JPO&INPIT |
