Abstract: First light is incident on a diffuser, and scattered light emerges from the diffuser. The diffuser includes one light incident surface on which the first light is incident in a first direction and a first light transmitting surface. The light incident surface is formed on an end surface of the diffuser. First transmitted light emerges from the first light transmitting surface. Second transmitted light emerges from second light transmitting surface that is a surface other than the first light transmitting surface of the diffuser. Intensity of the first transmitted light increases as a direction in which the first transmitted light emerges approaches the first direction. Correlated color temperature of the first light is lower than correlated color temperature of the first transmitted light and higher than correlated color temperature of the second transmitted light.

Abstract: An air conditioner includes a housing including an illumination opening at a position viewable by a user; a blower provided in an airflow path connecting an inlet and outlet; a light emitter provided in the housing viewable through the illumination opening and including a light incident portion to receive light emitted from a first light source and a first light emission portion to emit first light generated from the light and including light simulating natural light; and at least one light extractor emitting second light that is part of the light received by the light emitter that reaches an edge portion of the light emitter without being emitted as the first light or second light received from the first light source or a second light source different from the first light source without intervention of the light emitter. The at least one light extractor is provided in the airflow path.

Abstract: First light (L1) is incident on a diffuser (10), and scattered light emerges from the diffuser (10). The diffuser (10) includes one light incident surface (10a) on which the first light (L1) is incident in a first direction and a first light transmitting surface (10b). The light incident surface (10a) is formed on an end surface of the diffuser (10). First transmitted light (L21) emerges from the first light transmitting surface (10b). Second transmitted light (L22) emerges from second light transmitting surface (10c) that is a surface other than the first light transmitting surface (10b) of the diffuser (10). Intensity of the first transmitted light (L21) increases as a direction in which the first transmitted light (L21) emerges approaches the first direction. Correlated color temperature of the first light (L1) is lower than correlated color temperature of the first transmitted light (L21) and higher than correlated color temperature of the second transmitted light (L22).

Abstract: An illumination device includes a frame forming part that is provided at at least one position on an end part of a light-emitting panel having a light emission surface or in a vicinity of the light-emitting panel and includes a bright part region and a dark part region, a light source that emits light to be incident upon the frame forming part, and a light amount regulation part that makes intensity of light heading for a space facing the light emission surface from the dark part region weaker than intensity of light heading for the space from the bright part region in the light entering the frame forming part from the light source, or makes the intensity of the light from the bright part region stronger than the intensity of the light from the dark part region in the light entering the frame forming part from the light source.

Abstract: A diffuser generates scattered light and satisfies MFP=1/(?×A2×Qs×N)=?Zd, 0.4???5 where N denotes a number of nanoparticles included in a unit volume of a light guiding and diffusing portion, A denotes an average particle radius of the nanoparticles, Qs denotes a scattering efficiency determined by a combination of the nanoparticles and a medium of the light guiding and diffusing portion, MFP denotes a mean free path for light of a design wavelength set in a range of 450 nm to 650 nm, Zd denotes a length of the light guiding and diffusing portion in a light guiding direction of incident light, and a denotes a coefficient.

Abstract: An air conditioner includes a housing including an illumination opening at a position viewable by a user; a blower provided in an airflow path connecting an inlet and outlet; a light emitter provided in the housing viewable through the illumination opening and including a light incident portion to receive light emitted from a first light source and a first light emission portion to emit first light generated from the light and including light simulating natural light; and at least one light extractor emitting second light that is part of the light received by the light emitter that reaches an edge portion of the light emitter without being emitted as the first light or second light received from the first light source or a second light source different from the first light source without intervention of the light emitter. The at least one light extractor is provided in the airflow path.

Abstract: An illumination device that simulates the sky, includes a light source that emits first light; a light-emitting part that allows the first light to enter, guides the entered first light by means of total reflection while scattering the first light, and emits the scattered light from a light emission surface; a back surface reflective part that is provided to face a back surface as a surface of the light-emitting part on a side opposite to the light emission surface and reflects light emitted from the back surface of the light-emitting part; a frame that includes a part situated at least in front of the light emission surface of the light-emitting part; and an optical member that is provided between the light emission surface of the light-emitting part and the part of the frame and reflects a part of the light emitted from the light emission surface of the light-emitting part.

Abstract: An air conditioner includes a housing including an illumination opening at a position viewable by a user; a blower provided in an airflow path connecting an inlet and outlet; a light emitter provided in the housing viewable through the illumination opening and including a light incident portion to receive light emitted from a first light source and a first light emission portion to emit first light generated from the light and including light simulating natural light; and at least one light extractor emitting second light that is part of the light received by the light emitter that reaches an edge portion of the light emitter without being emitted as the first light or second light received from the first light source or a second light source different from the first light source without intervention of the light emitter. The at least one light extractor is provided in the airflow path.

Abstract: The diffusive body lets first light enter and emits scattered light, wherein a scattering layer and a transmission layer, the diffusive body has a light incidence surface that lets the first light enter and a main surface where a first light emission surface emitting the scattered light is formed, the light incidence surface is formed at an end face forming a first end part of the main surface, the diffusive body functions as a light guide path that makes the entered first light move to and fro between the scattering layer and the transmission layer, the scattering layer includes an optical medium on a nanometer order and generates the scattered light by having the first light scattered by the optical medium on the nanometer order, and a correlated color temperature of the scattered light is higher than the correlated color temperature of the first light.

Abstract: A lighting device includes a first light source to emit first light; a diffuser to receive the first light and emits first scattered light; and a frame to support the first light source and the diffuser. The diffuser includes nanoparticles, and guides the received first light, scatters it with the nanoparticles, and emits it as the first scattered light. The diffuser includes an incident surface to receive the first light, a first surface on which an emission surface to emit the first scattered light is formed, and a second surface opposite the first surface. The incident surface is at a first edge portion of the diffuser, the frame is opened to expose at least a portion of a region on the first surface of the diffuser in which the emission surface is formed and a region on the second surface corresponding thereto.

Abstract: An illumination device that simulates the sky, includes a light source that emits first light; a light-emitting part that allows the first light to enter, guides the entered first light by means of total reflection while scattering the first light, and emits the scattered light from a light emission surface; a back surface reflective part that is provided to face a back surface as a surface of the light-emitting part on a side opposite to the light emission surface and reflects light emitted from the back surface of the light-emitting part; a frame that includes a part situated at least in front of the light emission surface of the light-emitting part; and an optical member that is provided between the light emission surface of the light-emitting part and the part of the frame and reflects a part of the light emitted from the light emission surface of the light-emitting part.

Abstract: A diffuser generates scattered light and satisfies MFP=1/(?×A2×Qs×N)=?Zd, 0.4???5 where N denotes a number of nanoparticles included in a unit volume of a light guiding and diffusing portion, A denotes an average particle radius of the nanoparticles, Qs denotes a scattering efficiency determined by a combination of the nanoparticles and a medium of the light guiding and diffusing portion, MFP denotes a mean free path for light of a design wavelength set in a range of 450 nm to 650 nm, Zd denotes a length of the light guiding and diffusing portion in a light guiding direction of incident light, and a denotes a coefficient.

Abstract: An illumination device includes a frame forming part that is provided at at least one position on an end part of a light-emitting panel having a light emission surface or in a vicinity of the light-emitting panel and includes a bright part region and a dark part region, a light source that emits light to be incident upon the frame forming part, and a light amount regulation part that makes intensity of light heading for a space facing the light emission surface from the dark part region weaker than intensity of light heading for the space from the bright part region in the light entering the frame forming part from the light source, or makes the intensity of the light from the bright part region stronger than the intensity of the light from the dark part region in the light entering the frame forming part from the light source.

Abstract: A lighting device includes a first light source to emit first light; a diffuser to receive the first light and emits first scattered light; and a frame to support the first light source and the diffuser. The the diffuser includes nanoparticles, and guides the received first light, scatters it with the nanoparticles, and emits it as the first scattered light. The diffuser includes an incident surface to receive the first light, a first surface on which an emission surface to emit the first scattered light is formed, and a second surface opposite the first surface. The incident surface is at a first edge portion of the diffuser, the frame is opened to expose at least a portion of a region on the first surface of the diffuser in which the emission surface is formed and a region on the second surface corresponding thereto.

Abstract: The diffusive body lets first light enter and emits scattered light, wherein a scattering layer and a transmission layer, the diffusive body has a light incidence surface that lets the first light enter and a main surface where a first light emission surface emitting the scattered light is formed, the light incidence surface is formed at an end face forming a first end part of the main surface, the diffusive body functions as a light guide path that makes the entered first light move to and fro between the scattering layer and the transmission layer, the scattering layer includes an optical medium on a nanometer order and generates the scattered light by having the first light scattered by the optical medium on the nanometer order, and a correlated color temperature of the scattered light is higher than the correlated color temperature of the first light.

Abstract: A lighting unit includes a first light source to emit first light; and a diffusive body including a first incidence surface that allows the first light to enter, a diffusive part that includes nanoparticles, guides the entered first light and makes the first light be scattered by the nanoparticles into first scattered light, and an emission surface that emits the first scattered light, wherein the first incidence surface is formed on a first edge part of the diffusive body, the first scattered light is emitted from a first region of the emission surface, and a correlated color temperature of the first scattered light is higher than a correlated color temperature of the first light.