CPC G02F 1/133526 (2013.01) [G02F 1/0316 (2013.01); G02F 1/137 (2013.01)] | 9 Claims |
1. A lighting device comprising:
a light guide plate including a main surface and a rear surface,
a reflection sheet disposed at a rear surface side of the light guide, and
a prism sheet opposed to the main surface of the light guide plate,
wherein
the light guide plate is disk shaped, and includes a first hole at a center,
the reflection sheet is disk shaped, and includes a second hole at a center,
the prism sheet is disk shaped, and the prism sheet includes a first prism array opposing to the light guide,
further comprising a reflection mirror set in the first hole of the light guide, and
a light source set in the second hole of the reflection sheet and facing the reflection mirror,
wherein
the light guide plate includes a second prism array on the main surface, and a third prism array on the rear surface,
the first prism array is formed concentrically,
the second prism array is formed radially,
the third prism array is formed concentrically, and
a pitch of the first prism array is larger than a pitch of the third prism array.
|