Abstract: A propeller fan includes a rotary shaft portion that rotates around an axial center and a plurality of blades disposed around an outer circumferential portion of the rotary shaft portion. Each of the plurality of blades has at least one recessed portion that opens at a trailing edge of the blade. The at least one recessed portion has a first side that is close to an inner circumference of the blade. The first side stretches from the trailing edge toward a leading edge of the blade, and is bent toward an outer circumference of the blade.

Abstract: A propeller fan includes a shaft part and a blade. The blade includes a basal part connected to the shaft part, a first part positioned either at the basal part or closer to an outer circumference of the propeller fan than is the basal part and away from the rotation axis by a distance r1, a second part positioned away from the rotation axis by a distance r2 that is longer than r1, a third part positioned away from the rotation axis by a distance r3 that is longer than or equal to r2, and a tip part positioned at an outer circumferential end of the blade and away from the rotation axis by a distance rt that is longer than r3. A relationship expressed as (?2??1)/(r2?r1)>(?t??3)/(rt?r3)?0 is satisfied.

Abstract: A semiconductor device, includes: first semiconductor element including first and second electrodes; second semiconductor element including third and fourth electrodes; sealing resin covering the semiconductor elements; first, second, third, and fourth terminal portions respectively connected to the first, second, third, and fourth electrodes and exposed from the sealing resin; first island portion where the first semiconductor element is mounted; and second island portion where the second semiconductor element is mounted, wherein four quadrants divided by first imaginary line extending along second direction orthogonal to first direction and second imaginary line extending along third direction orthogonal to both the first and second directions are defined.

Abstract: A propeller fan includes a boss on a rotation axis, and a blade at an outer circumferential portion of the boss. The blade includes a leading edge and a trailing edge. The blade includes a first area, a first sub-area located inward of the first area, and a second sub-area located outward of the first area. The first area includes a notch formed in the trailing edge. Each of the first sub-area and the second sub-area include plural notches formed in the trailing edge. The notch in the first area is larger than each of the plural notches in each of the first sub-area and the second sub-area.

Abstract: An outdoor unit 1 of an air-conditioning apparatus includes a housing having a box shape and including air inlets formed on side surfaces and an air outlet formed on an upper surface, a fan provided to an upper side in the housing and configured to discharge, through the air outlet, outside air sucked through the air inlets, and a heat exchanger provided in the housing along each of the air inlets. The heat exchanger includes an upper heat exchanger disposed at an upper part of the housing and a lower heat exchanger disposed at a lower part of the housing. In plan view, the housing has different widths in short-side and long-side directions, and the width in the short-side direction at the upper part of the housing is longer than the width in the short-side direction at the lower part of the housing.

Abstract: A propeller fan includes a boss and a blade. The boss rotates about an axis. The blade is provided at an outer periphery of the boss. The blade has a first region in a radial direction. In the first region, a blade chord center line shifts downstream toward an outer peripheral side. In a cylindrical cross section about an axis, a cross-sectional shape of the blade at least in the first region is an airfoil shape. When a cross section taken along the blade chord center line and projected onto a plane including the axis is viewed, the blade chord center line is a curve having a convex on a downstream side in an entire region in the radial direction.

Abstract: Provided is an air-sending device in which, in blades, an upstream end of a blade outer periphery is more on an upstream side than an upstream end of a blade inner periphery as seen along a rotation axis, and a downstream end of a blade outer periphery is more on a downstream side than a downstream end of the blade inner periphery, and in which, in the blades, when an angle formed by a line segment, which connects a point internally dividing a line segment connecting the downstream end and the upstream end of an outer periphery of the blades along the rotation axis and a point internally dividing a line segment connecting the downstream end and the upstream end of an inner periphery of the blades along the rotation axis at the same ratio to each other, and a reference line is defined as ?, and a direction inclined toward the downstream side is defined as positive, the angle ? is changed from negative to positive at a duct portion.

Abstract: An LED drive circuit drives an LED module. The LED module has a light-emitting diode, and an identification unit having characteristic information relating to light-emitting characteristics of the light-emitting diode. The LED drive circuit includes a detection unit and a drive circuit. The detection unit is provided for detecting characteristic information, and generates a detection signal that corresponds to the characteristic information. The drive circuit generates drive current by a drive signal supplied according to the characteristic information based on the detection signal, and supplies the drive current to drive the light-emitting diode.

Abstract: A propeller fan includes a rotary shaft portion that rotates around an axial center and a plurality of blades disposed around an outer circumferential portion of the rotary shaft portion. Each of the plurality of blades has at least one recessed portion that opens at a trailing edge of the blade. The at least one recessed portion has a first side that is close to an inner circumference of the blade. The first side stretches from the trailing edge toward a leading edge of the blade, and is bent toward an outer circumference of the blade.

Abstract: A blower apparatus includes a propeller fan configured to rotate about a rotational axis, and a bell mouth annularly disposed to surround the propeller fan as seen in a direction of the rotational axis of the propeller fan. The bell mouth includes a flare portion located downstream of the propeller fan The flare portion has at least one first part and at least one second part. The first part has a first inner circumferential surface region. The second part as a second inner circumferential surface region. A first length of the first part inner circumferential surface region in the direction of the rotational axis is greater than a second length of the second part inner circumferential surface region in the direction of the rotational axis.

Abstract: A boss fitted to a rotation shaft of a motor is placed on a bearing surface. An airflow producing unit includes blades protruding from the boss in a radial direction of the shaft and rotating with the boss. The boss includes a first end surface to contact the bearing surface when fitted to the shaft with a first end of the boss in a thickness direction facing the bearing surface, and a second end surface to contact the bearing surface when fitted to the shaft with a second end of the boss in the thickness direction facing the bearing surface. A degree of symmetry defined by A/B falls within a range of 1.0 to 1.3, where A is a height of the airflow producing unit from the first end surface, B is a height of the airflow producing unit from the second end surface, and A B.

Abstract: A semiconductor device, includes: first semiconductor element including first and second electrodes; second semiconductor element including third and fourth electrodes; sealing resin covering the semiconductor elements; first, second, third, and fourth terminal portions respectively connected to the first, second, third, and fourth electrodes and exposed from the sealing resin; first island portion where the first semiconductor element is mounted; and second island portion where the second semiconductor element is mounted, wherein four quadrants divided by first imaginary line extending along second direction orthogonal to first direction and second imaginary line extending along third direction orthogonal to both the first and second directions are defined.

Abstract: A bellmouth of a heat source unit includes: a straight tubular portion having a cylindrical shape; an air inlet portion which is radially expanded toward the upstream side, wherein, the air inlet portion has at least one angle-reduced portion that satisfies ?0>?i>0, where, an angle formed by a line L1 and a line L2 is taken as ?0, and an angle formed by a straight line L3 and the line L2 is taken as ?i, the line L1 is a line passing through a portion of an outer peripheral end portion of the air inlet portion, the line L2 is a line passing through a connecting portion between the air inlet portion and the straight tubular portion, and the straight line L3 is a line connecting an intersection P of the line L1 and the line L2 and a portion of the outer peripheral end portion of the air inlet portion.

Abstract: Provided is a propeller fan including a boss, and a blade fixed at an outer peripheral surface of the boss, wherein the blade has a second protrusion that protrudes toward a positive pressure surface side, at a trailing edge with respect to a rotation direction, the second protrusion is provided in a range on a radially outer side of a center of a radial distance from an inner peripheral end to an outer peripheral end of the blade, and has a protrusion tip end with a maximum protrusion height, a first base at a starting part of protrusion on a radially inner side of the protrusion tip end, and a second base at a starting part of protrusion on a radially outer side of the protrusion tip end, and the protrusion tip end is positioned nearer to the second base than to the first base in the radial direction.

Abstract: A propeller fan includes a shaft part and a blade. The blade includes a basal part connected to the shaft part, a first part positioned either at the basal part or closer to an outer circumference of the propeller fan than is the basal part and away from the rotation axis by a distance r1, a second part positioned away from the rotation axis by a distance r2 that is longer than r1, a third part positioned away from the rotation axis by a distance r3 that is longer than or equal to r2, and a tip part positioned at an outer circumferential end of the blade and away from the rotation axis by a distance rt that is longer than r3. A relationship expressed as (?2??1)/(r2 ?r1)>(?t??3)/(rt?r3)?0 is satisfied.

Abstract: An LED drive circuit drives an LED module. The LED module has a light-emitting diode, and an identification unit having characteristic information relating to light-emitting characteristics of the light-emitting diode. The LED drive circuit includes a detection unit and a drive circuit. The detection unit is provided for detecting characteristic information, and generates a detection signal that corresponds to the characteristic information. The drive circuit generates drive current by a drive signal supplied according to the characteristic information based on the detection signal, and supplies the drive current to drive the light-emitting diode.

Abstract: A propeller fan includes a boss on a rotation axis, and a blade at an outer circumferential portion of the boss. The blade includes a leading edge and a trailing edge. The blade includes a first area, a second area inward of the first area, and third areas outward of the second area. The third areas are located inward and outward of the first area, with the first area interposed between the third areas. The first area, the second area and the third areas each include at least one notch in the trailing edge. The notches satisfy the relationship “P1>P2>P3”, where P1 is the width of the notch in the first area, P2 is the width of the notch in the second area, and P3 is the width of the notch in each of the third areas.

Abstract: A casing has a wall portion surrounding an impeller, as seen in an axial direction of a rotating shaft. The wall portion of the casing has a portion, and a portion located further away from a center of rotation of the rotating shaft than the portion, as seen in the axial direction. A curved portion has a curved surface portion located on a line connecting the center of rotation and the portion, and a curved surface portion located on a line connecting the center of rotation and the portion, as seen in the axial direction. A radius of curvature of the curved surface portion is greater than a radius of curvature of the curved surface portion.

Abstract: An axial flow fan according to the present invention includes a plurality of blades, each of the blades including: a leading edge formed in front in a direction of rotation of the axial flow fan; an inner circumferential edge formed at an inner circumference of the blades; and an outer circumferential edge formed at an outer circumference of the blades, the outer circumferential edge configured to be at downstream of a fluid, forced to move by the axial flow fan, than the inner circumferential edge, the blade being reflexed toward upstream of the fluid at a portion adjacent to the outer circumferential edge, and having a local angle-decrease section having a blade inlet angle ? at the leading edge decreasing from neighborhood, the local angle-decrease section being formed at a side of the leading edge and being located closer to the outer circumferential edge than to the inner circumferential edge.

Abstract: A propeller fan includes a boss on a rotation axis, and a blade at an outer circumferential portion of the boss. The blade includes a leading edge and a trailing edge. The blade includes a first area, a first sub-area located inward of the first area, and a second sub-area located outward of the first area. The first area includes a notch formed in the trailing edge. Each of the first sub-area and the second sub-area include plural notches formed in the trailing edge. The notch in the first area is larger than each of the plural notches in each of the first sub-area and the second sub-area.