Patent ID: 8727580

Claim:
An illuminating device comprising: a light source that includes a plurality of light emitting devices and a phosphor; and a lens sheet that stays on an optical axis of the light source, the lens sheet having a plurality of prisms that is symmetrically arranged with respect to the optical axis of the light source, wherein the plurality of prisms is configured at least on a surface of the lens sheet in which to face the light source, a plurality of light scattering elements is configured at least on a surface of the lens sheet in which not to face the light source, the lens sheet comprises a first lens group arranged next to the optical axis of the light source, and a second lens group arranged so as to surround the first lens group, each of the first and second lens groups including prisms of the plurality of prisms, the first lens group includes a plurality of refraction prisms, the refraction prisms being configured to have a region in which each output angle thereof continuously increases with distance from the optical axis of the light source, and the second lens group includes a plurality of reflection prisms, the reflection prisms being configured to have a region in which each output angle thereof randomly changed regardless of the distance from the optical axis of the light source.