Patent ID: 9732933
Date: 2017-08-15
CPC Classifications: F21V,G02B

Claim:
1. An illumination device comprising: a light source unit; and an optical member having a plate-like shape and disposed in front of the light source unit, wherein the optical member comprises a first refractive prism having a function of refracting light, and a reflective prism disposed on an outer side of the first refractive prism and having a function of reflecting light, wherein an optical axis of the light source unit is configured to pass through a region in which the first refractive prism is disposed, wherein the first refractive prism is configured to cause an incident light to travel to a side opposite to the optical axis, wherein the reflective prism is configured to cause an incident light to travel to the optical axis side, wherein the first refractive prism and the reflective prism are provided linearly along a first direction on a first surface of the optical member, wherein the optical member further comprises a linear prism along a second direction orthogonal to the first direction on a second surface of the optical member, and wherein the linear prism is configured to be asymmetric with respect to the optical axis.