Lighting device

Abstract

To provide a luminaire in which loss of light quantity radiated from a plurality of light emitting elements is small, and in which a color mixing property is high.SOLUTION: A luminaire A1 includes a plurality of light emitting elements 202, a long columnar light guide member 22, and a diffusion member 23. The plurality of light emitting elements 202 radiate light of one color out of a plurality of colors. The light guide member 22 guides the light radiated from the plurality of light emitting elements 202 inside. The diffusion member 23 diffuses the light guided by the light guide member 22. The light guide member 22 has an incident surface 221 and an emission surface 222 as opposing end surfaces in the longer direction of the light guide member 22. To the incident surface 221, the light radiated from the plurality of light emitting elements 202 comes in. From the emission surface 222, the light which has entered from the incident surface 221 and is guided inside emits. The longer direction is along an optical direction D1 of the plurality of light emitting elements 202.SELECTED DRAWING: Figure 2

Claims

[Claim 1] A plurality of light-emitting elements, each emitting light of a different color from each other, A long, columnar light guide member that guides the light emitted from the plurality of light-emitting elements inside, The system comprises a diffusion member that diffuses the light guided by the light guide member, The light guide member has, as opposing end faces in the longitudinal direction of the light guide member, an incident surface into which the light emitted from the plurality of light-emitting elements is incident, and an exit surface into which the light incident from the incident surface and guided inside the member is emitted. The longitudinal direction is along the optical axis direction of the plurality of light-emitting elements, Lighting device. [Claim 2] The light guide member has a portion in which both the shape of the cross-section perpendicular to the longitudinal direction and the area of ​​the cross-section are constant in the longitudinal direction. The lighting device according to claim 1. [Claim 3] The light guide member has a cross-sectional shape and area that are both constant in the longitudinal direction, perpendicular to the longitudinal direction. The lighting device according to claim 2. [Claim 4] The light guide member has a first portion in which both the shape of the cross-section and the area of ​​the cross-section are constant in the longitudinal direction, and a second portion in which at least one of the shape of the cross-section and the area of ​​the cross-section differs from that of the first portion. The lighting device according to claim 2. [Claim 5] The light guide member causes at least a portion of the light incident from the incident surface to be totally reflected by the side surface of the light guide member along the longitudinal direction. A lighting device according to any one of claims 1 to 4. [Claim 6] The shape of the light guide member is cylindrical. A lighting device according to any one of claims 1 to 4. [Claim 7] The shape of the light guide member is a rectangular prism. A lighting device according to any one of claims 1 to 4. [Claim 8] The light guide member is The incident surface has a recess, The recess is provided so as to cover the plurality of light-emitting elements. A lighting device according to any one of claims 1 to 4. [Claim 9] The system further comprises a light-gathering unit that collects the light diffused by the aforementioned diffusion member, The light-gathering portion is provided at a position facing the emission surface, with the diffusion member in between. A lighting device according to any one of claims 1 to 4. [Claim 10] A plurality of light-emitting elements, each emitting light of a different color from each other, A long cylindrical body having an inner surface that reflects the light emitted from the plurality of light-emitting elements, The system comprises a diffusing member that diffuses the light that has traveled through the cylindrical body, The aforementioned cylindrical body is The cylindrical body further comprises a pair of opposing openings in the longitudinal direction, one of which is an inlet opening into which the light emitted from the plurality of light-emitting elements enters, and the other of which is an outlet opening into which the light that entered from the inlet opening and traveled through the cylindrical body exits. The longitudinal direction is along the optical axis direction of the light-emitting element, The cylindrical body has a portion in which both the shape of the cross-section perpendicular to the longitudinal direction and the area of ​​the cross-section are constant in the longitudinal direction. Lighting device. [Claim 11] The cylindrical body has a cross-sectional shape and a cross-sectional area that are both constant in the longitudinal direction. The lighting device according to claim 10. [Claim 12] The cylindrical body comprises a first portion in which both the shape of the cross-section and the area of ​​the cross-section are constant in the longitudinal direction, and a second portion in which at least one of the shape of the cross-section and the area of ​​the cross-section differs from that of the first portion. The lighting device according to claim 10. [Claim 13] The cylindrical body causes at least a portion of the light incident from the incident opening to be totally reflected on the inner surface, A lighting device according to any one of claims 10 to 12. [Claim 14] The shape of the inner surface of the cylindrical body is circular when viewed from the longitudinal direction. A lighting device according to any one of claims 10 to 12. [Claim 15] The shape of the inner surface of the cylindrical body is polygonal when viewed from the longitudinal direction. A lighting device according to any one of claims 10 to 12. [Claim 16] The cylindrical body is provided such that the entrance opening covers the plurality of light-emitting elements. A lighting device according to any one of claims 10 to 12. [Claim 17] Further comprising a light-gathering unit that gathers the light diffused by the diffusing member, The light-gathering portion is provided at a position opposite the emission opening, with the diffusion member in between. A lighting device according to any one of claims 10 to 12.

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