34results about How to "Reduce heat accumulation" patented technology

An LED light source unit having excellent heat dissipation properties, preventing damage on an LED, illuminating brightly, and having a long service life. The LED light source unit has a printed circuit board, one or more light emitting diodes mounted on the printed circuit board, and an adhesive tape for fixing the printed circuit board to the surface of a heat dissipation member. The LED light source unit is characterized in that the heat conductivity of the tape is 1 to 4 W / mK, and the withstand voltage between a rear surface conductor circuit and a metal casing is 1.0 kV or higher.

The invention discloses the roller surface high-frequency impulse laser induced directional discharging hair device, comprising impulsing power source, high frequency pulse laser generator, discharged electrode and control device. The device comprises the following characteristics: the bipolar of impulsing power source connected with roller and discharged electrode, the discharged electrode placed on the laser focal point of laser generator, the control device controlling the impulsing power source and high frequency pulse laser generator. The device has good directionality, high working frequency, big power, and good hair controllability and homogeneity.

The invention relates to an exposure method of an exposure machine. The exposure machine is provided with an exposure platform for bearing an object to be processed and a manuscript. The exposure method of the exposure machine comprises the following steps of: arranging at least one light source group for generating an exposure light source illuminating toward the exposure platform above the exposure platform; and enabling the exposure light source to reach a preset area of the exposure platform according to a preset path displacement mode of the light source group so as to expose and displaythe object to be processed on the exposure platform. In tThe invention, can greatly reduce the bulb number is greatly reduced, relatively reduce the size of the whole exposure machine is reduced relatively, decrease the equipment cost is decreased and lessen the occurrence frequency of the heat-collecting phenomenon of the exposure machine is reduced. Particularly, the light source group only needs an area illuminated by the exposure light source through the exposure platform so as to save unnecessary processing cost.

The invention relates to a heat dissipation module of a circuit board. The heat dissipation module comprises a main circuit board, a first heat dissipation base, a heat-conducting fin and a pneumatic pump, wherein the first heat dissipation base is arranged at the upper side of the main circuit board and is provided with an air inlet, an air vent and an air runner communicated with the air inlet and the air vent. In addition, the heat-conducting fin is clamped between the main circuit board and the first heat dissipation base; the pneumatic pump is connected to the air inlet; heat accumulated in the main circuit board is conducted to the first heat dissipation base by virtue of the heat-conducting fin; airflow generated by the pneumatic pump flows through the air runner so as to take away the heat accumulated in the first heat dissipation base, so that a heat source generated by the main circuit board can be effectively reduced.

The invention provides an IGBT parallel static current sharing circuit which has advantages of static current sharing, accurate and reliable current sharing adjustment, stable switching frequency, long service life, and high suitability for power electronic equipment which requires IGBT parallel connection and is on for a long time period. The IGBT parallel static current sharing circuit comprises a global control circuit, at least two parallel IGBTs, and local feedback control circuits which are arranged in one-to-one correspondence with the IGBTs. The emitter electrode of each IGBT is connected with the input end of a corresponding local feedback control circuit, and the gate electrode is connected with the output end of the corresponding local feedback control circuit. The local feedback control circuits are connected with the global control circuit. The local feedback control circuits are used for adjusting the amplitude of a driving signal transmitted to the corresponding IGBT according to the acquired feedback signals and a reference signal that is transmitted by a global driving time delay control module. The global control circuit is used for computing the reference signal of the local feedback control circuit according to each IGBT current.

The invention provides a quantum dot light-emitting diode, comprising a cathode and an anode oppositely arranged, a quantum dot light-emitting layer arranged between the cathode and the anode, and a quantum dot light-emitting layer arranged between the cathode and the quantum dot light-emitting layer A laminate, the laminate includes a first metal oxide nanoparticle layer and a mixed material layer disposed on the surface of the first metal oxide nanoparticle layer away from the quantum dot light-emitting layer, and the material of the first mixed layer Comprising first metal oxide nanoparticles and second metal oxides dispersed in the gaps of the first metal oxide nanoparticles, the first metal oxide nanoparticles in the first metal oxide nanoparticle layer are electronic transport material; and in the mixed material layer, along the direction from the quantum dot light-emitting layer to the cathode, the content of the second metal oxide gradually increases.

A high-efficiency scanning method for discontinuous filling laser additive manufacturing. Firstly, the scanning single-layer information of the part along the Z direction is obtained through data processing software, and the single-layer data is divided into contour data and filling data. The filling data and contour data are both It is the generated scanning path data; in the scanning of each single layer, continuous contour scanning is performed according to the obtained contour data; when the filling data is scanned, the laser power and spot are adjusted in real time by using the control program, so that the laser beam is The penetration depth of the production material is increased enough to penetrate the thickness of multiple layers, and only one filling scan and the contour scan of the corresponding number of layers are performed in multiple layers; after the filling data scanning is completed, the laser power is restored to the initial state through the control program , repeating until the part is finished, the present invention can greatly improve the molding efficiency of the manufacturing process under the premise of taking into account both the molding accuracy and the molding quality.

The invention discloses a novel energy-saving lamp. The novel energy-saving lam comprises a lamp holder, a ballast cover, a lamp filament, a tube, an energy-saving electronic rectifier and a tube connected thermal protection shield, wherein the lamp filament is installed in the tube; rare earth powder is sprayed on the inner wall of the tube; the energy-saving electronic rectifier is installed in the ballast cover; the tube connected thermal protection shield is arranged at the combing part of the tube and the ballast cover; a screw connecting column and a lamp wick wire jacket base are arranged on the upper end surface of the tube connected thermal protection shield; a cavity is arranged at the lower end of the tube connected thermal protection shield; a positioning base and a control system are arranged in the cavity; a radiator is arranged in the tube connected thermal protection shield; heat emission holes are formed in the tube connected thermal protection shield; and the radiator is connected with the control system. The novel energy-saving lamp has the advantages that the tube connected thermal protection shield is arranged at the combining part of the tube and the ballast cover and adopts a rotatable structure, and a self-locking buckle is arranged on the inner wall of the tube connected thermal protection shield, so that the novel energy-saving lamp can not only emit heat inside the tube and reduce accumulated heat heating inside the energy-saving lamp, but also effectively prevent mosquitoes and dust from entering the lamp and increase the service life of the tube.