Abstract: A wavelength conversion module includes a driving element, a wavelength conversion wheel, and at least one flow guide. The wavelength conversion wheel includes a rotary disc and at least one wavelength conversion layer. The driving element is connected to the rotary disc to drive the wavelength conversion wheel to rotate along an axis of the driving element as a central axis. The flow guide is disposed beside the wavelength conversion wheel at intervals along the axis, and at least one airflow channel is formed between the flow guide and the wavelength conversion wheel. The flow guide and the driving element are disposed at intervals, and the flow guide does not contact the rotary disc and the driving element. An orthographic projection of the flow guide on the rotary disc overlaps the wavelength conversion layer. When the wavelength conversion wheel rotates, the wavelength conversion wheel and the flow guide move relatively.

Abstract: A fan structure including a center portion, multiple fan blades, and a fixing ring is provided. The center portion includes a bottom surface and a center shaft. The center shaft is perpendicular to the bottom surface, and the direction in which the center shaft extends is an axial direction. The fan blades are mutually separated and connected to the bottom surface of the center portion and are disposed around the axial direction. Each of the fan blades has a height which is parallel to the axial direction. The fixing ring simultaneously contacts the side of the fan blades which is away from the center shaft. Along the axial direction, with the bottom surface of the center portion as a reference surface, the fixing ring is disposed at a range of 40% to 80% of the height of each of the fan blades.

Abstract: A wavelength conversion element, including a turntable, is provided. The turntable is configured to rotate along a central axis. The turntable has a first surface and a plurality of first turbulence portions and a plurality of second turbulence portions located on the first surface, wherein the first turbulence portions and the second turbulence portions are arranged by surrounding the central axis, a shape of each of the first turbulence portions is different from a shape of each of the second turbulence portions, and at least one of the second turbulence portions is arranged between two adjacent first turbulence portions of the first turbulence portions. A projector, including the wavelength conversion element, is further provided. The wavelength conversion element and the projector effectively improve the heat dissipation effect.

Abstract: A fan structure including a center portion, multiple fan blades, and a fixing ring is provided. The center portion includes a bottom surface and a center shaft. The center shaft is perpendicular to the bottom surface, and the direction in which the center shaft extends is an axial direction. The fan blades are mutually separated and connected to the bottom surface of the center portion and are disposed around the axial direction. Each of the fan blades has a height which is parallel to the axial direction. The fixing ring simultaneously contacts the side of the fan blades which is away from the center shaft. Along the axial direction, with the bottom surface of the center portion as a reference surface, the fixing ring is disposed at a range of 40% to 80% of the height of each of the fan blades.

Abstract: A wavelength conversion module includes a driving element, a wavelength conversion wheel, and at least one flow guide. The wavelength conversion wheel includes a rotary disc and at least one wavelength conversion layer. The driving element is connected to the rotary disc to drive the wavelength conversion wheel to rotate along an axis of the driving element as a central axis. The flow guide is disposed beside the wavelength conversion wheel at intervals along the axis, and at least one airflow channel is formed between the flow guide and the wavelength conversion wheel. The flow guide and the driving element are disposed at intervals, and the flow guide does not contact the rotary disc and the driving element. An orthographic projection of the flow guide on the rotary disc overlaps the wavelength conversion layer. When the wavelength conversion wheel rotates, the wavelength conversion wheel and the flow guide move relatively.

Abstract: A wavelength conversion element, including a turntable, is provided. The turntable is configured to rotate along a central axis. The turntable has a first surface and a plurality of first turbulence portions and a plurality of second turbulence portions located on the first surface, wherein the first turbulence portions and the second turbulence portions are arranged by surrounding the central axis, a shape of each of the first turbulence portions is different from a shape of each of the second turbulence portions, and at least one of the second turbulence portions is arranged between two adjacent first turbulence portions of the first turbulence portions. A projector, including the wavelength conversion element, is further provided. The wavelength conversion element and the projector effectively improve the heat dissipation effect.

Abstract: A fan module and an electronic device are provided. The fan module includes a hub and a plurality of blades. The blades are mounted around the hub, and each of the blades has a first end that is connected to a periphery of the hub and a second end that is relatively away from the hub. A first axial direction distance in the axial direction is provided between a first point of the first end that is relatively away from the top surface and the top surface. A second axial direction distance in the axial direction is provided between a second point of the first end that is near the top surface and the top surface. A ratio of the second axial direction distance to the first axial direction distance is 0.4 to 0.5.

Abstract: The disclosure provides a fan module and an electronic device. The fan module includes a hub and a plurality of blades. The blades are mounted around the hub, and each of the blades has a first end is connected to a periphery of the hub and a second end that is relatively away from the hub. A first axial direction distance in the axial direction is provided between a first point of the first end that is relative away from the top surface and the top surface. A second axial direction distance in the axial direction is provided between a second point of the first end that is near the top surface and the top surface. A ratio of the second axial direction distance to the first axial direction distance is 0.4 to 0.5.

Abstract: A flight device including a device main body and a plurality of lift force providing modules is provided. The lift force providing modules are connected to the device main body. Each of the lift force providing modules includes two propellers, and each of the propellers rotates to lift the device main body. Two propellers of each of the lift force providing modules may rotate around the same rotation axis. The flight device has an enhanced lift force and good efficiency in lifting, and the flight device has a reduced device volume and improved flight reliability.

Abstract: An unmanned aerial vehicle includes a body, a plurality of cantilevers and a plurality of driving components. Each cantilever has a first end and a second end. Each first end is opposite to the corresponding second end. The first ends are connected to the body. The driving components are respectively connected to the second ends of the cantilevers. Each driving component includes a motor and a plurality of paddles. The motor has a shaft. The propeller is connected to the shaft and includes a balance disc and a plurality of paddles. The balance disc is connected to the motor. The paddles are connected to the balance disc. The balance disc has a plurality of counterweight holes. The counterweight holes are used to be disposed with the at least one counterweight block. A propeller is also provided.

Abstract: An aerial vehicle and a propeller thereof are provided. The propeller includes a hub and at least one blade. The hub is rotatable about a shaft, and the blade is mounted to the hub. The blade extends from the hub to a tip along a first direction and has a leading edge and a tailing edge opposite to the leading edge. The blade has a section along a second direction in an arbitrary position along the first direction. The second direction is perpendicular to the first direction. A section of the blade in a first position along the first direction has a first peak value of chord length, and a section of the blade in a second position along the first direction has a second peak value of chord length. The second position is between the first position and the tip.

Abstract: An axial flow fan is provided. The axial flow fan includes an impeller and a fan frame. The impeller has a maximum outer diameter. The fan frame includes a first body and a second body. The first body includes a plurality of connecting elements and a base. The connecting elements are connected to the base. The second body is a hollow body, and used for disposing around the impeller. The second body includes a flow passage having a minimum inner diameter. The minimum inner diameter of the flow passage is not larger than the maximum outer diameter of the impeller. Therefore, the size of the second body does not restrict the maximum outer diameter of the impeller, and the shape of the impeller and the shape of the fan frame can be designed flexibly according to the practical demand.

Abstract: A cooling system for a hand-held electronic device includes a casing including a compartment, at least one air inlet in communication with the compartment, and at least one air outlet in communication with the compartment. A wind driving assembly is mounted in the compartment and includes a frame, a package, and a thermally conductive cover. The thermally conductive cover engages with the frame and the package. An impeller is rotatably arranged in the frame having an outlet hole adjacent to the at least one air outlet. The package receives at least one electronic element that generates heat during operation. The thermally conductive cover includes an inlet hole in communication with an interior of the frame. An air channel is formed between the thermally conductive cover and an interior wall face of the casing. The at least one air inlet intercommunicates with the inlet hole via the air channel.

Abstract: A centrifugal fan includes a fan frame, a stator assembly and an impeller. The fan frame has a base plate portion, a cover plate portion and a lateral wall portion. The cover plate portion includes first and second faces. The cover plate portion includes an air inlet, and the lateral wall portion includes an air outlet. The impeller has a radial rotational range. The cover plate portion includes an air-guiding section and an enlarged guiding section. The air-guiding section is aligned with the radial rotational range, and the enlarged guiding section is aligned with an area outside the radial rotational range. A part of the second face is spaced from a bottom of the base plate portion by a first minimal axial distance, and another part of the second face is spaced from the bottom by a second minimal axial distance smaller than the first minimal axial distance.

Abstract: A jacket for a handheld electronic device includes: a housing adapted to couple with a handheld electronic device; a fan mounted in the housing; and a control unit electrically connecting with the fan and adapted to electrically connect with the handheld electronic device, with the control unit capable of controlling the fan according to a control command outputted by the handheld electronic device.

Abstract: A protective cover for a hand-held electronic device includes a base having an inner face and an outer face opposite to the inner face. The base further includes at least one air guiding hole extending from the inner face through the outer face. A positioning member is provided along a periphery of the base. The positioning member and the base together define a receiving space. A cooling module is mounted in the receiving space. The cooling module includes a cooling fan and a flow guiding portion. The cooling fan and the flow guiding portion are fixed to the inner face of the base. The cooling fan includes an air outlet adjoining the flow guiding portion. The flow guiding portion includes a flow guiding face having at least one non-parallel face at a non-parallel angle to the inner face.

Abstract: An axial flow fan is provided. The axial flow fan includes an impeller and a fan frame. The impeller has a maximum outer diameter. The fan frame includes a first body and a second body. The first body includes a plurality of connecting elements and a base. The connecting elements are connected to the base. The second body is a hollow body, and used for disposing around the impeller. The second body includes a flow passage having a minimum inner diameter. The minimum inner diameter of the flow passage is not larger than the maximum outer diameter of the impeller. Therefore, the size of the second body does not restrict the maximum outer diameter of the impeller, and the shape of the impeller and the shape of the fan frame can be designed flexibly according to the practical demand.

Abstract: A cooling fan having a radial-air-gap motor is disclosed. The cooling fan includes a fan frame, an impeller and a stator assembly. The fan frame has a shaft-coupling portion. The impeller has a hub, a shaft and a plurality of blades. The blades are arranged on an outer periphery of the hub. At least one magnetic element is arranged on an inner periphery of the hub. There is a height between a bottom face of the shaft-coupling portion and a top face of the hub. There is a maximum thickness between the bottommost and uppermost faces of the magnetic plate unit. A ratio of the maximum thickness to the height is between 0.1 and 0.6. A method for determining the dimensional proportion of the motor is also disclosed. The method selects a ratio of a maximum thickness to a height as 0.1 to 0.6.

Abstract: A cooling system for a hand-held electronic device includes a casing including a compartment, at least one air inlet in communication with the compartment, and at least one air outlet in communication with the compartment. A wind driving assembly is mounted in the compartment and includes a frame, a package, and a thermally conductive cover. The thermally conductive cover engages with the frame and the package. An impeller is rotatably arranged in the frame having an outlet hole adjacent to the at least one air outlet. The package receives at least one electronic element that generates heat during operation. The thermally conductive cover includes an inlet hole in communication with an interior of the frame. An air channel is formed between the thermally conductive cover and an interior wall face of the casing. The at least one air inlet intercommunicates with the inlet hole via the air channel.

Abstract: A centrifugal fan includes a fan frame, a stator assembly and an impeller. The fan frame has a base plate portion, a cover plate portion and a lateral wall portion. The cover plate portion includes first and second faces. The cover plate portion includes an air inlet, and the lateral wall portion includes an air outlet. The impeller has a radial rotational range. The cover plate portion includes an air-guiding section and an enlarged guiding section. The air-guiding section is aligned with the radial rotational range, and the enlarged guiding section is aligned with an area outside the radial rotational range. A part of the second face is spaced from a bottom of the base plate portion by a first minimal axial distance, and another part of the second face is spaced from the bottom by a second minimal axial distance smaller than the first minimal axial distance.