Abstract: A rotor includes a hub, rotary blades extending outwardly from the hub, and an annular wall surrounding the rotary blades. Each rotary blade includes a windward lateral surface and a leeward lateral surface at opposite sides thereof. The annular wall adjoins the outer ends of the rotary blades and is rotatable therewith. A perforation is defined in the annular wall between two neighboring rotary blades and adjacent to the leeward lateral surface of a leading rotary blade of the neighboring rotary blades.

Abstract: A fin assembly includes a plurality of fins interconnected together. Each of the fins includes a main body defining a plurality of openings and a plurality of locking units formed on the main body beside the plurality of openings, respectively. Each of the locking units includes an extension tab, a locking tab and a connecting tab. An engaging hole is defined in the extension tab. The locking tab forms an elastically deformable finger thereon. A locking tab of a fin is received in a corresponding opening of an adjacent fin. A free end of the locking tab of the fin resists on a connecting tab of the adjacent fin. A finger of the fin is engaged into an engaging hole of the adjacent fin.

Abstract: A heat dissipation device includes a heat sink, a cooling fan, an electric motor and a belt. The cooling fan includes a fan housing and an impeller. The impeller includes a hub, a plurality of fan blades and a shaft extending from the hub and having a distal end protruded out of the fan housing. A fan pulley is fixed to the distal end of the shaft. The electric motor includes a driving pulley. The belt has one end engaging with the driving pulley of the electric motor and an opposite end engaging with the fan pulley of the cooling fan. Rotation of the driving pulley of the electric motor is transferred to the fan pulley via the belt to cause the impeller to rotate.

Abstract: A centrifugal fan includes a housing and an impeller rotatably received in the housing. The housing defines an air inlet in a top plate thereof and an air outlet in a sidewall thereof. The air inlet is perpendicular to the air outlet. The impeller includes a hub and a plurality of blades extending outwardly from a sidewall of the hub. Each of the blades includes an inner blade section connected with the sidewall of the hub and an outer blade section extending outwardly from the inner blade section. An upper portion of the inner blade section is curved upwardly and forwardly from a curved lower portion of the inner blade section towards an adjacent front blade. The curved lower portion has a curvature smaller than that of the upper portion.

Abstract: A heat sink tester for pressing a heat sink against a simulation heat source includes a base, a pressing assembly and a supporting device. The base is for supporting the heat sink thereon. The pressing assembly presses the heat sink against the base along a first direction. The supporting device is for supporting the simulation heat source thereon. The supporting device pushes the simulation heat source through the base to engage against the heat sink along a second direction opposite to the first direction.

Abstract: A securing device includes a securing member defining a securing hole therein, and a fastener extending through the securing hole. The fastener includes a spring, and a bolt having a main portion, a bottom fixing portion, and a top head portion. The securing hole includes a large portion, a small portion, and a concave around the small portion. A diameter of the small portion is greater than the main portion and smaller than the fixing portion. A diameter of the large portion is greater than the fixing portion and smaller than the spring. The main portion extends through the small portion with the fixing portion tightly abutting the securing member. The spring is mounted around the main portion and received in the concave. The spring is compressed between the head portion and a step of the securing member in the concave.

Abstract: A heat dissipation device (100) includes a fin assembly (10) having a plurality of fins (12). Each fin includes a locking tab (126b) with a connecting end (1268), a free end (1269), a hole (1261) adjacent to the connecting end, a hook (1262) adjacent to the free end, and a tongue (1263) between the hole and the hook. A punched hole (127b) in each fin is adjacent to the locking tab, which extends through the punched hole of an adjacent fin. The hook of the locking tab engages the hole in the locking tab of the adjacent fin, locking them together.

Abstract: A heat dissipation device includes a heat sink and a cooling fan arranged thereon. The cooling fan includes a motor-stator and an impeller mounted around the motor-stator. The motor-stator is arranged on a middle of the heat sink. The heat sink includes a base and a plurality of fins extending upwardly from the base. The heat sink defines a plurality of notches incising the fins. The notches are angled towards the middle of the heat sink immediately under the motor-stator of the cooling fan.

Abstract: A heat dissipation device includes a centrifugal blower and fins. The centrifugal blower includes a housing defining a space therein, and an impeller rotatably disposed in the space of the housing. The housing includes a bottom plate, an opposite top plate defining an air inlet therein, and a sidewall disposed between the bottom plate and the top plate. The sidewall defines an air outlet therein. The top plate further defines an opening therein between the air inlet and the air outlet. The opening is spaced from the air inlet via a partition rib. The impeller is located corresponding to the air inlet of the top plate, for driving air to enter the housing via the air inlet and the opening and to leave the housing via the air outlet. The fins are disposed on the bottom plate and located at the air outlet of the centrifugal blower.

Abstract: A rotor includes a hub, rotary blades extending outwardly from the hub, and an annular wall surrounding the rotary blades. Each rotary blade includes a windward lateral surface and a leeward lateral surface at opposite sides thereof. The annular wall adjoins the outer ends of the rotary blades and is rotatable therewith. A perforation is defined in the annular wall between two neighboring rotary blades and adjacent to the leeward lateral surface of a leading rotary blade of the neighboring rotary blades.

Abstract: An LED lamp (100) includes a plurality of LED modules (20) and a thermal module (30). Each of the LED modules has a plurality of LEDs (220). The thermal module is secured to a side of the LED modules. The thermal module includes a plurality of fins (320). The fins are stacked with one above another with a gap defined between two adjacent fins. Each of the fins defines two opening (325). The openings of the fins coincide with each other from top to bottom so as to form two channels (328). The channels are used for air to flow therein to exchange heat with the fins.

Abstract: A centrifugal fan includes a housing including an air collecting portion, a first frame and a second frame. The air collecting portion has an air outlet defined in one end thereof. The first and second frames are located at two opposite sides of an opposite end of the air collecting portion. The first and second frames each define a receiving space therein for rotatably receiving an impeller. The first and second frames each further define a vent hole therein. The receiving spaces of the first and second frames communicate with the inner space of the air collecting portion via the vent holes thereof. Airflow generated by the two impellers travels to the inner space of the air collecting portion through the vent holes of the first and second frames, and exits the centrifugal fan through the air outlet of the air collecting portion.

Abstract: A clip includes a main body, a pair of locking members integrally formed at opposite ends of the main body, and a securing member secured onto one of the locking members. The one locking member includes an upper portion, a lower portion wider than the upper portion, and a step between the upper and lower portions. The securing member includes a handling portion and an engaging portion extending downwardly from the handling portion. A pair of flanges are formed on the engaging portion facing the main body and abutting the step. A clearance is defined between the flanges and the engaging portion receiving the upper portion. One of the engaging portion and the one locking member forms an engaging hole, and the other one forms a hook engaging into the engaging hole.

Abstract: An electronic apparatus includes a PCB with a heat generating electronic component disposed thereon, a heat sink, and a mounting device for mounting the heat sink onto the heat generating electronic component. The mounting device includes a mounting frame and a wire clip. The mounting frame surrounds the heat sink, and includes two first mounting arms and two second mounting arms disposed above the first mounting arms. The first mounting arms abut on the PCB. A pair of engaging wings are formed on the second mounting arms. The wire clip includes a pivot axle pivotably attached to the mounting frame and two resilient arms at opposite sides of the mounting frame. The resilient arms abut against the heat sink and engage with the engaging wings, thereby exerting a resilient force on the heat sink toward the heat generating electronic component.

Abstract: A thermal module includes a substrate and a heat pipe integrally embedded in the substrate by insert molding technique. An end of the heat pipe protrudes laterally out of the substrate. The heat pipe includes a tube, a wick structure attached to an inner surface of the tube and a working fluid filled in the tube. A method for manufacturing the thermal module includes following steps: providing a tube with a wick structure attached to an inner surface thereof, an end of the tube being open; placing the tube into a mold; injecting a molten metal into the mold to form a substrate with the tube being integrally embedded in the substrate and the open end of the tube protruding laterally out of the substrate; filling a working fluid into the tube via the open end; sealing the open end of the tube.

Abstract: A heat sink tester for pressing a heat sink against a simulation heat source includes a base, a pressing assembly and a supporting device. The base is for supporting the heat sink thereon. The pressing assembly presses the heat sink against the base along a first direction. The supporting device is for supporting the simulation heat source thereon. The supporting device pushes the simulation heat source through the base to engage against the heat sink along a second direction opposite to the first direction.

Abstract: An injection mold has a plurality of cavities and a runner system for injecting material into the cavities. The runner system includes a main-runner and a sub-runner. The sub-runner interconnects the main-runner and the cavities. The sub-runner includes a first runner and a pair of second runners. The first runner connects the main-runner, and the second runners respectively connects ends of the first runner. A buffer rejoin is formed around a joint of the first runner and each second runner for mixing material when the material flows from the first runner into the second runners to make the material have a symmetric speed distribution in the second runners.

Abstract: A light emitting diode (LED) lamp includes a lampshade, a light guide pole and a plurality of LEDs. The light guide pole is of light permeable material and received in the lampshade. A plurality of irregular elements is formed on an outer surface of the light guide pole. A distribution density of the irregular elements decreases gradually from two ends of the light guide pole towards a middle of the light guide pole. The LEDs are mounted at the two ends of the light guide pole. Light emitted by the light emitting diodes falls incident into the light guide pole and exits the light guide pole from the outer surface thereof.

Abstract: A light emitting diode (10) includes an LED chip (14) and an encapsulant (16) enclosing the LED chip. The LED chip has a light emitting surface (141), and the encapsulant has a light output surface (161) over the light emitting surface. The light output surface defines a plurality of annular, concentric grooves (163). Each groove is cooperatively enclosed by a first groove wall (165) and a second groove wall (166). The first groove wall is a portion of a circumferential side surface of a cone, and a conical tip of the cone is located on the light emitting surface of the LED chip.

Abstract: A reading lamp (100) includes a lamp holder (20), a lampshade (40), a bracket (30) connecting the lamp holder with the lampshade, and a white light illuminator (50) received in the lampshade. The white light illuminator includes a light mixer (52), and at least a group of solid-state, light emitting elements (544) arranged to at least one side of the light mixer. The at least a group of solid-state, light emitting elements includes three kinds of solid-state, light emitting elements which respectively emit red, green and blue lights. The light mixer reflects, refracts and mixes the red, green and blue lights to obtain white light which directly radiates and spreads from a light emitting surface (521) of the light mixer.