| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique that can accurately position a luminous flux control member against a light-emitting element mounted on a board and hardly generating erroneous assembling between the luminous flux control member and the board. <P>SOLUTION: When an amount of an axis gap (λ) between the center axis of the luminous flux control member 2 and an optical axis of the light-emitting element becomes (ε<λ≤δ) when dropping the luminous flux control member 2 on the board 3, an inclined surface part 8b of a first leg 8 slidably comes in contact with an open edge 11a of a positioning hole 11 of the board 3, and slidably drops with its own weight until a second leg 10 is seated on a fixed surface 13 of the board 3. When the second leg 10 is seated on the fixed surface 13, the amount of the axis gap (λ) between the center axis of the luminous flux control member 2 and the optical axis of the light-emitting element becomes (λ=ε). Thus, the luminous flux control member 2 can be assembled without generating assembling errors on the board 3 where the light-emitting element 4 is mounted, and the center axis of the luminous flux control member 2 and the optical axis of the light-emitting element can be aligned within a desired accuracy (a range of 0 to ε). <P>COPYRIGHT: (C)2013,JPO&INPIT |
