Abstract: A heat exchanger includes a distributor; a plurality of heat-transfer tubes; and a refrigerant inflow pipe. The plurality of heat-transfer tubes connected to the distributor stick out into an internal space of the distributor such that when the plurality of heat-transfer tubes and a part defined as the internal space are projected on a plane perpendicular to an axial direction of the distributor, the plurality of heat-transfer tubes occupies one-half or greater of the part defined as the internal space. The distributor includes an orifice plate and dividing the internal space. The orifice plate is located above the lowest one of the plurality of heat-transfer tubes in the internal space. The orifice plate has an orifice through which the upper and lower spaces communicate with each other.

Abstract: [Purpose] To provide a surface illumination fixture using a point light source having strong directivity. [Constitution] In the surface illumination fixture 3 including a surface illumination light-source device 6 converting light from a plurality of point light sources 36 having strong directivity into surface illumination and an illumination fixture main body 41, the surface illumination light-source device 6 includes a casing 30 having a flat plate part 35 being used to attach the surface illumination light-source device to the illumination fixture main body, lateral plate parts standing from the flat plate part, and an opening on a surface opposite to the flat plate part, and includes a light-guide reflection plate covering the opening. The flat plate part 35, the lateral plate parts 32 and 33, and the light-guide reflection plate 40 are formed by members having a high light reflectance and a low light transmittance.

Abstract: To provide a planar light source device that can provide large-area, uniform, and high-quality planar illumination light. A planar light source device includes a main body case 4 that surrounds the periphery of a gap between a pair of optical reflection plates disposed to face each other with side plates, and a plurality of point light sources 2 arranged at predetermined intervals on at least one side plate of the main body case. The planar light source device allows light from the point light sources 2 to be transmitted through at least one of the pair of optical reflection plates 5 and emitted to the outside.

Abstract: To provide a planar light source device that can provide large-area, uniform, and high-quality planar illumination light. A planar light source device includes a main body case 4 that surrounds the periphery of a gap between a pair of optical reflection plates disposed to face each other with side plates, and a plurality of point light sources 2 arranged at predetermined intervals on at least one side plate of the main body case. The planar light source device allows light from the point light sources 2 to be transmitted through at least one of the pair of optical reflection plates 5 and emitted to the outside.

Abstract: [Purpose] To provide a surface illumination fixture using a point light source having strong directivity. [Constitution] In the surface illumination fixture 3 including a surface illumination light-source device 6 converting light from a plurality of point light sources 36 having strong directivity into surface illumination and an illumination fixture main body 41, the surface illumination light-source device 6 includes a casing 30 having a flat plate part 35 being used to attach the surface illumination light-source device to the illumination fixture main body, lateral plate parts standing from the flat plate part, and an opening on a surface opposite to the flat plate part, and includes a light-guide reflection plate covering the opening. The flat plate part 35, the lateral plate parts 32 and 33, and the light-guide reflection plate 40 are formed by members having a high light reflectance and a low light transmittance.