| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve a problem that when light from an LED element is reflected by a reflecting member with a cross-section of conic section and made incident into an incident end face of a light guide plate, it is sometimes concentrated in the vicinity of the incident end face of the light guide plate, and as a result, a great heat is generated in the vicinity of the incident end face. <P>SOLUTION: An LED element 1 is held by a mounting board 11a, a sidewall 11b, and a transparent medium 11c between the mounting board 11a and the sidewall 11b. The sidewall 11b works as a reflecting member and is formed by different elliptical cross-section shapes EA, EB, EC. First focal points F1A, F1B, F1C of the different elliptical cross-section shapes EA, EB, EC are located in an identical position and the LED element 1 is arranged in this position. The second focal points F2A, F2B, F2C of the elliptical cross-section shapes EA, EB, EC are located in different positions in the light guide plate 2. Light from the LED element 1 is reflected by the elliptical cross-section shapes EA, EB, EC of the sidewall 11b and passes through the different focal points F2A, F2B, F2C of the light guide plate 2. <P>COPYRIGHT: (C)2012,JPO&INPIT |
