Patent ID: 9733550
Date: 2017-08-15
CPC Classifications: F21V,F21W,G02B,G02F,G03B

Claim:
1. A lighting apparatus comprising: a light source which emits light with a predetermined light distribution in a fixed direction; and an optical element which is arranged in such a manner that at least part of the light emitted from the light source is input to the optical element, and can perform switching to a transmission state in which the light is transmitted, a first reflection state in which the light is reflected in a first direction, and a second reflection state in which the light is reflected in a second direction different from the first direction, wherein the optical element includes: first and second transparent substrates which are arranged so as to face each other, a first prism layer which is provided on a surface, on a near side to the second transparent substrate, of the first transparent substrate, a first transparent electrode film which is provided on a surface of the prism layer, a second transparent electrode film which is provided on a surface, on a near side to the first transparent substrate, of the second transparent substrate, and an electrolyte layer which is arranged between the first and second transparent electrode films, and includes an electro-deposition material containing silver, and wherein the optical element is arranged in such a manner that the light emitted from the light source is input to and inclines to the first or second transparent substrate.