Patent ID: 8827491
Filing Date: 2014-09-09
Classification: F21S,F21V,F21Y,G02B

Abstract:
1. A lighting device comprising: a plurality of light emitting units that each include a light emitting element and a light flux controlling member that controls a traveling direction of light emitted from the light emitting element, and that are arranged at predetermined intervals; an illuminated surface part that is illuminated by light emitted from the light flux controlling member; and an opposing illuminated surface part that is disposed to oppose the illuminated surface part, wherein: each of the plurality of light emitting units has the light flux controlling member and the light emitting element arranged so that a central axis of the light flux controlling member matches the optical axis of the light emitting element; the illuminated surface part is disposed so that an incident angle of light, which is emitted with a larger angle about the optical axis out of light emitted from the light flux controlling member, on the illuminated surface part becomes smaller; the light flux controlling member includes the incidence part includes a first incidence surface part that is formed on an inner top surface of a concave part formed by making a bottom surface of the light flux controlling member opposing the light emitting element concave inward and a second incidence surface part that is located between an outer rim of the first incidence surface part and an opening edge of the concave part; the total reflection surface part is formed between the bottom surface and the emission surface part so as to surround the optical axis and totally reflects light mainly incident from the second incidence surface part of the incidence part toward the emission surface part; and the emission surface part includes