Abstract: According to one embodiment, an equipment enclosure includes a plurality of equipment elements, each element having one or more heat generating sources. A heat exchanger is mounted towards the top of the equipment enclosure. The heat exchanger is thermally coupled to at least some of the heat generating sources. The enclosure includes an exhaust vent through which air heated by the heat exchanger may be evacuated, and an inlet vent through which air from outside the equipment enclosure may be drawn into the equipment enclosure to cool the heat exchanger by stack effect ventilation.

Abstract: A heat exchange structure includes elongated air ducts. Each air duct has a first opening and a second opening at two ends of the air duct to allow air to enter and exit the air duct, respectively. The heat exchange structure includes an exterior heat exchange surface and interior heat exchange surfaces, in which the exterior heat exchange surface is configured to receive thermal energy from heat generators that are mounted on the exterior heat exchange surface, and the exterior heat exchange surface dissipates a portion of the thermal energy received from the heat generators and transfers another portion of the thermal energy to the interior heat exchange surfaces. The interior heat exchange surfaces are in the elongated air ducts and configured to exchange thermal energy with air flowing in the air ducts, enhancing air flow in the air ducts by buoyancy of heated air.

Abstract: A cooking appliance for cooking a foodstuff over a period of time including a shell having a heating cavity and a heating element to heat the heating cavity. A container is removably positionable within the heating cavity and includes a food cavity for receiving the foodstuff. A temperature probe is removably insertable into the foodstuff and a controller is mounted to the shell. The controller controls operation of the cooking appliance in a probe mode wherein the temperature probe is inserted into the foodstuff and transmits foodstuff temperatures to the controller for controlling the heating of the foodstuff, a program mode wherein the controller actuates the heating element to heat the container at a temperature for a selected amount of time and subsequently at a lower temperature and a manual mode wherein the controller actuates the heating element to heat the container at a selected temperature.

Abstract: A solar inverter assembly has a first housing part, which is used as a heat sink, and a second housing part for holding electronic components of the solar inverter. The first housing part has a first air inlet opening, a first air outlet opening and a first air channel connecting the air inlet and air outlet openings. Air flows on the basis of natural convection through the first air channel. The second housing part has a second air inlet opening, a second air outlet opening, and a second air channel which connects the second air inlet opening to the second air outlet opening. Air flows on the basis of natural convection through the second air channel. At least one electronic component, which is insensitive to dust, of the solar converter, for example a transformer or an inductor, is mounted in the second housing part in direct thermal contact with the first housing part and within the second air channel.

Abstract: There is provided a digital broadcasting receiver apparatus in which a temperature in the area surrounding a removable HDD does not become a high temperature during an operation regardless of whether it is disposed horizontally or vertically. A component with a large heat generating quantity and a component with a small heat generating quantity are installed in respective spaces inside a case. An adapter of the removable HDD is mounted to dispose the removable HDD in a space in which a component with a small heat generating quantity is mounted, thereby preventing the temperature in the area surrounding the removable HDD from becoming a high temperature.

Abstract: A cable management rack is provided within which or upon which a heat-generating device is mountable, and which encompasses a vertical rectangular frame open in a front and a rear of the frame. The rack includes a first upright and a second upright attached to opposite respective lateral sides of a base and a top member, and respective side-facing panels. Each of the panels defines a plurality of vent holes arranged in an array and permit the rack to receive a sideways flow of cooling air into a first side of the rack through one of the vent hole arrays for cooling a heat-generating device mounted between the panels, and permit the rack to discharge a sideways flow of exhaust air through the other vent hole array. Each of the array of vent holes may manifest a honeycomb pattern of vent holes, and each of the vent holes may manifest an hexagonal shape.

Abstract: A circuit board (1) has a top face (2) for positioning an electronic component and a bottom face (4) used as a support on a heat-dissipating base. A plurality of heat transfer holes (12) provide heat transfer from the top face (2) to the bottom face (4). The heat transfer holes (12) are unevenly or non-uniformly distributed on the top face (2) in such a way that the top face (2) is provided with several free sectors (14) which are free of heat transfer holes (12) in order to connect the electronic component to the circuit board (1). The free sectors (14) are configured as columns or lines. A plurality of heat transfer holes (12) are placed at least along the long sides of the free sectors (14). The circuit board has a low thermal resistance between the electronic component and the heat-dissipating base.

Abstract: A heat-dissipating structure includes a support unit and a fan unit disposed in the receiving space. The support unit has a plane portion, a support portion extending downwards from a front side of the plane portion, and an opening passing through the plane portion. The plane portion has a board body, a concave space formed on the top surface of the plane portion, a non-skid pad detachably received in the concave space, a slender block body disposed on a base of the top surface of the board body, and a slender non-skid body disposed on a base of the bottom surface of the board body. The support portion has a support body, a receiving space formed in its inside, a plurality of slender openings formed on two opposite lateral sides of the support body, and a slender non-skid body disposed on a base of the support body.

Abstract: A heat exchange structure includes a plurality of elongated air ducts. The heat exchange structure has an exterior heat exchange surface and interior heat exchange surfaces, the interior surfaces being in the elongated air ducts. The heat exchange structure includes a plurality of heat generators that are distributed on the exterior heat exchange surface along an elongated direction of the air ducts, in which air flowing in the air duct is heated successively by heat from the heat generators, and air flow in the air duct is enhanced by buoyancy of heated air.

Abstract: An air backflow prevention member includes a frame assembly including a plurality of vanes and a plurality of stops. The plurality of vanes are rotatable between an open position, wherein the plurality of vanes are oriented oblique to a direction of airflow and in contact with the plurality of stops, and a closed position, wherein the plurality of vanes are oriented perpendicular to the direction of airflow.

Abstract: An outdoor apparatus that incorporates a heat sink and has a box-shaped casing, having a plurality of aligned ventilation holes formed on an upper plate and a lower plate so as to oppose the heat sink, and wherein inter-hole portions that are portions of the upper plate between adjacent ventilation holes are recessed downward with respect to other portions of the upper plate.

Abstract: A luminaire system having an elongated throughway utilizing a thermal chimney effect. The thermal chimney effect within the throughway circulates air to remove heat generated from the electrical components of the system. Dissipating heat into the throughway from the electrical components can increase the life expectancy of the lamp and the output of the lamp. The electrical components of the system being entirely sealed and isolated from the throughway results in a permanent air, dust, and water tight seal. The permanent seal can minimize damage to the electrical components of the system as well as prevent the build up of moisture and dust within these sealed components.

Abstract: An arrangement is disclosed for a motor controller, the arrangement including a number of power semiconductors and cooling elements, the cooling elements being connected to the power semiconductors for cooling them. The power semiconductors and the cooling elements are disposed around a center axis of the arrangement in such a manner that they demark a channel around the center axis from at least three sides, to which channel cooling surfaces of the cooling elements extend and in which the cooling medium is able to flow in the direction of the center axis, and the power semiconductors extend from the connections between the power semiconductors and the cooling elements substantially away from the center axis. The arrangement can further include at least one choke disposed in the channel demarked around the center axis.

Abstract: An electrical enclosure assembly comprises an enclosure having walls defining an interior space for housing electrical components and having a front flange surrounding a front opening. A cover is hingedly mounted to the enclosure for selectively closing the front opening. The cover comprises a front wall larger than the front opening and a rearwardly extending peripheral rim. Cooling structure is integrally formed on an interior surface of the cover proximate the peripheral rim. The cooling structure comprises a plurality of spaced apart cooling ribs each having a shoulder engaging the enclosure front flange when the cover is in a closed position to provide an air flow path between the interior space and outside of the enclosure through spaces between the cooling ribs.

Abstract: A housing, which may contain a hard disk drive, is configured to removably mount to a recessed surface of a console. The housing includes a lip and a biased latch arm so that the lip can be inserted into a corresponding feature in the recessed surface and the housing can be rotatably mounted to the recessed surface. The biased latch arm is retained by a latch arm retainer so that the housing is held in place. A cable connector extends from the bottom of the housing and is configured to connect to a receptor on the console when the housing is installed. When desired, a latch on the housing can be translated where the translation cause the biased latch arm to translate so as to clear the latch arm retainer. Thus the housing can be readily removed from the console. Preferably a portion of the housing extends beyond a wall of the recessed surface so that when installed, the housing alters the profile of the console.

Abstract: A portable electronic device includes a screen module, a main body module and an input/output module. The screen module is pivotally connected with the body module. The input/output module is electrically connected with the main body module. An actuating element is disposed at a bottom of the screen module. When the screen module is opened respectively to the body module to be opened, the actuating element is driven to swing to push a front end of the input/output module to be lifted to drive the input/output module to be out of a state that the keyboard abuts against the main body module. Therefore, the portable electronic device is easy to be operated. Moreover, the heat dissipation is improved to keep the internal temperature low and reduce energy consumption.

Abstract: A system and method are disclosed for enclosing electronic equipment in a noiseproofed and ventilated enclosure. This includes supplying air to an enclosure and removing air from the enclosure through acoustic chambers attached to the enclosure. The acoustic chambers can be constructed of materials or be treated with materials that have noise-absorbing or noise-abating properties. In addition, the acoustic chamber for exhausting air from the enclosure can contain baffles that help to prevent noise that has entered the acoustic chamber from leaving the chamber. And, the system and method can use a cable egress port that allows cables and wiring to pass through the egress port while blocking the transmission of noise through the egress port.

Abstract: An electronic circuit contains a circuit board with conducting tracks to which one or more electronic components with conducting contacts are positioned overlying portions of the conducting tracks and each such electronic component is held in place by a clamp that covers and is contact with the top surface of the electronic components so as to hold their conducting contacts in electrical contact with the conducting tracks of the circuit board. The clamp can include a resilient layer held between the top surface of electronic components and a rigid clamping sheet.

Abstract: A cooling device for use in an electronic apparatus is capable of achieving a sufficient cooling capability with an effective replacement method in a narrow flow path. The cooling device for the electronic apparatus, which includes a plurality of members juxtaposed such that surfaces thereof confront each other, at least one of the members including a heat radiating surface, includes a first air-cooling member which includes a first outlet port that creates a first air stream, and a second air-cooling member which includes a second outlet port that creates a second air stream to flow in a direction different from the first air stream. The first and second outlet ports have different opening widths, respectively.

Abstract: An electronic built-in system for installation in a support structure mounted in a passenger compartment of a vehicle. The system includes at least one electronic module and a housing for receiving the electronic modules. The housing is mounted to the support structure of the vehicle and includes a front control panel with operating elements for operating the electronic system. The front control panel faces the passenger compartment. A cooling unit is provided in the housing for guiding cooling air through the housing for cooling the electronic modules. At least one first opening in an outer wall portion of the housing supplies cooling air to the housing. At least one second opening in an outer wall portion of the housing removes the cooling air from the housing. The first and second openings are arranged at different wall portions of the housing, which are separated from the passenger compartment by the support structure when the built in system is installed in the support structure.

Abstract: A robot control device that controls operation of a robot having an actuator includes a casing, an actuator driver, a drive-control board, a main control board, a main power supply board, a vent passage, a cooling fan, and a holding member. The actuator driver is accommodated in the casing and drives the actuator. The drive-control board is accommodated in the casing and controls operation of the actuator driver. The main control board is accommodated in the casing and controls operation of the drive-control board. The main power supply board is accommodated in the casing and supplies a power to the drive-control board and the main control board. The vent passage is defined by at least the drive-control board, the main control board, and the main power supply board and has an end open to the exterior of the casing. The cooling fan is arranged at an end of the vent passage and causes the air to flow through the vent passage. The holding member is provided in the vent passage and holds the actuator driver.

Abstract: In a heat radiation mechanism of an electronic apparatus, an opening allowing flow of air between a first duct side and a second duct side is formed on a portion mounted with a heating device of a circuit board in an air flow route constituted by a first duct and a second duct, and heat generated from the heating device is radiated from a first vent hole or a second vent hole through the air flow route.

Abstract: A telecommunications cabinet in which active equipment can be mounted. The cabinet including an airflow ducting arrangement located in the interior region of the cabinet. The airflow ducting arrangement accommodating thermal cooling of active equipment having internal side-to-side air cooling arrangements.

Abstract: An electronic device including a base and a pluggable unit is provided. The base includes a first heat sink having a first heat-transfer contacting surface. The pluggable unit includes a second heat sink and a heat source. The second heat sink has a second heat-transfer contacting surface. When the pluggable unit is plugged in the base, the first heat-transfer contacting surface gets in contact with the second heat-transfer contacting surface.

Abstract: The present invention provides a display apparatus that can achieve high durability by making the most of the function of the exhaust fans to effectively suppress the rise of the temperature. The display apparatus comprises a display panel for displaying images, a rear case covering a rear side of the display panel, and an exhaust fan disposed within the rear case, wherein the rear case includes a first air-hole area and a second air-hole area each provided with a plurality of air holes, the first air-hole area is located at a higher level than the second air-hole area with respect to a vertical direction with a spacing therebetween, and at least partially faces the exhaust fan, and an area surrounded by the first air-hole area, the second air-hole area and external common tangents thereof is a shielded area in which no air hole is provided.

Abstract: A central air manifold for an electronic module enclosure includes a front section and a rear section. The front section includes openings adapted to communicate with electronic modules and the rear section includes openings adapted to communicate with fans. The openings of the front section can be open when electronic modules are installed in the front section and the openings in the rear section can be open when operating fans are installed in the rear section.

Abstract: An electronic equipment enclosure system with a side-to-side airflow control system includes an enclosure, having a front, a rear, a top, a bottom and two sides, and a side-to-side airflow control system. The airflow control system includes a side wall disposed adjacent one side of the enclosure, and a manifold disposed adjacent the other side of the enclosure. Electronic equipment having a front, a rear, a top, a bottom and two sides is disposed between the side wall and the manifold. Cooling air is routed into a first of the two sides of the electronic equipment, and heated exhaust air is routed out of a second side of the two sides of the electronic equipment and into the manifold. The side wall prevents the heated exhaust air from mixing with the cooling air at the first side of the electronic equipment.

Abstract: Provided is a circuit device capable of increasing the packaging density and also suppressing the thermal interference between incorporated circuit elements. In a hybrid integrated circuit device, a first circuit board and a second circuit board are incorporated into a case member being arranged in a way that the first circuit board is overlaid with the second circuit board. A first circuit element is arranged on the upper face of the first circuit board and a second circuit element is arranged on the upper face of the second circuit board. In addition, inside the case member, a hollow portion (internal space) which is not filled with a sealing resin is provided, and this hollow portion communicates with the outside through a communicating opening, which is provided by partially opening the case member.

Abstract: A heat spreader and method for thermal management of a computer memory module by promoting natural convection cooling of the memory module. The heat spreader includes a frame surrounding a planar body adapted to be mounted to a memory module of a computer, and a grid defined in the planar body by a plurality of uniformly distributed perforations. The perforations extend through the planar body to allow natural convention between an interior space beneath the planar body and an exterior space above the planar body.

Abstract: In a disk array apparatus, by taking note of a first sound of a specific frequency which is a noise element of original sounds generated from a fan, a second sound whose phase is inverted to that of the first sound is generated by a structure of a cooling air flow path passing through the fan, and the second sound is synthesized with the first sound on the cooling air flow path, thereby reducing the noise. For example, an exhaust duct is located on a fan unit in an upper part of the apparatus, two flow paths extending to an exhaust port are formed in an internal structure of the exhaust duct, and the two flow paths are designed so that the difference in the flow path length therebetween becomes equivalent to half wavelength of the specific frequency.

Abstract: A vented cover includes a pair of cross-flow ventilation ducts each including an acoustic noise reduction lining. The ducts are “cross-flow” in that they cross and bypass one another. The cover is affixed to an enclosure containing components of a computer system and abuts against a panel of the enclosure having an airflow aperture. An air moving device (AMD) passes air through the enclosure from the ducts if the cover is an intake cover, and/or into the ducts if the cover is an exhaust cover. The ducts increase the air path length, and the acoustic absorbing surface, thereby increasing acoustic attenuation. Airflow resistance is reduced by reducing surfaces perpendicular and close to the area where air enters and by reducing sharp turns in the ducts. The cover has a relatively thin depth because the ducts cross and bypass each other in a very space efficient manner.

Abstract: An electronic device having an exhaust opening configured to exhaust air outside, the electronic device includes a door part configured to close the exhaust opening when the electronic device has a predetermined temperature, wherein the door part is rotated based on the own weight of the door part and a wind pressure of the air taken in the electronic device and exhausted outside the electronic device, so that the exhaust opening is closed.

Abstract: A fan [36] and storage device [37] mounting assembly [1] for an electronic device comprises a base [2] having opposing front [4] and rear [5] walls. The rear wall [5] has a plurality of ventilation openings [11] provided therein. A support [16] has a fan [36] mount [32] arranged adjacent to the front wall [4] and substantially perpendicular thereto and a storage device [37] receiving opening [20] arranged between the fan mount [32] and the ventilation openings [11].

Abstract: Device with integrated electronic components, that comprises a board forming a support for the said components, a cover mounted on the said board to cover the said components, and a separating partition which extends from the cover to the board substantially perpendicularly to the latter, the said partition separating two distinct zones of the board, wherein it comprises an overcover covering the cover and defining an internal space between the cover and the overcover in which are provided cooling gas division means delimiting two distinct secondary spaces in the internal space, an upstream secondary space into which cooling gas is able to be injected and a downstream secondary space into which cooling gas is able to be discharged so that cooling gas injected into the upstream zone of the board is directed toward the downstream secondary space of the internal space and that cooling gas injected into the upstream secondary space of the internal space is directed toward the downstream zone of the board.

Abstract: An electronic equipment enclosure includes a frame structure, one or more enclosure panels mounted on the frame structure, an exhaust duct, and at least one adjustable filler panel assembly. The frame structure and the one or more enclosure panels together define an enclosure. The exhaust duct is substantially the same height as the enclosure and has an air inlet opening formed therein for receipt of exhaust air from equipment mounted in the enclosure. Each adjustable filler panel assembly selectively blocks a portion of the air inlet opening in order to prohibit air exhausted into the duct from flowing back into the enclosure.

Abstract: A fan holder for mounting a fan, includes two opposite sidewalls defining a receiving area therebetween, each of the sidewalls defining a through hole therein; two or more polygonal auxiliary members arranged in the through hole of each of the sidewalls and located about an axis; and wherein the polygonal auxiliary members are rotationally offset from each other.

Abstract: In a portable electronic apparatus, a second keyboard to be manipulated with a right hand is joined to a first keyboard unit including a first keyboard to be manipulated with a left hand so that the second keyboard can be turned down. A display unit having a built-in liquid crystal display is joined to the first keyboard unit so that the display unit can be tuned down. When the display unit is turned down, the display unit engages with the second keyboard unit that is turned down. When all the parts of the electronic apparatus are closed, the electronic apparatus serves as a CD player of a CD jacket size. When the display unit is opened, the electronic apparatus has not only the capability of a DVD player but also the capability of a simple personal computer. When all the parts are left open, the electronic apparatus serves as a personal computer having a full keyboard.

Abstract: A synthetic jet includes an inner wall configured to surround a heat-generating component, a plurality of walls coupled to the inner wall, the inner wall and the plurality of walls configured to enclose a volume surrounding the inner wall, an actuator coupled to one of the plurality of walls and the inner wall. The inner wall has a plurality of orifices formed therein configured to direct a fluid toward the heat-generating component upon activation of the actuator.

Abstract: An optical disc drive may include a tray movable for the sake of mounting and dismounting a disc, a disc rotation mechanism arranged at the center to rotate the disc, and a pickup arranged on a backside of the center to write and read the disc within a housing. The optical disc drive may be arranged with a first opening for inhaling outside air in a height range between the bottom surface of the tray and the proximity to the bottom end of the pickup on a back surface or a side surface around a corner on a right side viewed from the backside of the housing, and a second opening for exhausting internal air, arranged higher than a top surface of the tray on the back surface or a side surface around a corner on a left side viewed from the backside.

Abstract: A synthetic jet includes an inner wall configured to surround a heat-generating component, a plurality of walls coupled to the inner wall, the inner wall and the plurality of walls configured to enclose a volume surrounding the inner wall, an actuator coupled to one of the plurality of walls and the inner wall. The inner wall has a plurality of orifices formed therein configured to direct a fluid toward the heat-generating component upon activation of the actuator.

Abstract: An electronic apparatus includes a housing including an outlet formed in a first surface thereof and a filter storage opening formed in a second surface thereof; a heat radiating member disposed closer to the outlet than the filter storage opening in the housing and to radiate heat received from a heating electronic component to the air flowing through an inlet thereof; a filter member inserted into the housing through the filter storage opening and disposed on the front surface of the inlet; a filter receiving portion; and a fan disposed at a side the filter member across from the heat radiating member and feeding air into the inlet. The filter receiving portion receives a tip supporting portion of the filter member at a position away from the inlet. The lid portion has such a dimension that the filter storage opening is closed.

Abstract: An external AC power adapter. The adapter includes a housing which, in one embodiment, defines an air inlet compartment, an air outlet compartment and a partially sealed electronics compartment containing electrical components for converting an AC input to a DC output. A blower generates an airflow within the electronics compartment for cooling the electrical components in the electronics compartment. Barriers are located in the air inlet compartment and the air outlet compartment to prevent liquid from entering the electronics compartment.

Abstract: A cooling distribution configuration is provided for chassis-mounted electronics boards. In one embodiment, the chassis comprises a housing and at least one electronics board. The electronics board may comprise a communication board having a plurality of ports. Cooling air spaces are defined above and below the board, permitting cooling air to be drawn over both sides of the board. Notches extend inwardly from an edge of the board, the notches serving as air flow paths between the cooling air spaces and serving to distribute cooling air flowing into the housing from one or more intakes to the cooling air spaces.

Abstract: A data storage library includes a drive enclosure bay which can be adapted to work with multiple air-flow configuration requirements. This is accomplished by creating air-flow ports in the top and bottom of the drive enclosure bay, by forming drive tray slots and printed circuit board ports in associated drive trays, by creating frame ports and PCB notches in associated interface cards, and replacing traditional connectors with slimmer but longer connectors that provide additional standoff and improved air-flow.

Abstract: An electronic device includes a casing, a thermal generating element, and a heat sink. The thermal generating element is disposed within the casing and operates to produce thermal energy. The heat sink includes a thermal transfer plate and a plurality of movable thermal transfer members. The thermal transfer plate contacts the thermal generating element and includes a plurality of recesses. Each of the movable thermal transfer members has a weight end and a free end. The weight end is accommodated in the recess. The thermal energy produced by the thermal generating element is conducted to the movable thermal transfer members via the thermal transfer plate. When the casing is tilted by a certain angle, the movable thermal transfer member swings relative to the thermal transfer plate, such that the free end thereof points to a direction opposite to that of an acceleration of gravity under a normal state.

Abstract: A micro-electromechanical (MEM) synthetic jet actuator includes a semiconductor substrate having a cavity extending therethrough, such that a first opening is formed in a first surface of the semiconductor substrate and such that a second opening is formed in a second surface of the semiconductor substrate. A first flexible membrane is formed on at least a portion of the front surface of the semiconductor substrate and extends over the first opening. The first flexible membrane also includes an orifice formed therein aligned with the first opening. The MEM synthetic jet actuator also includes a second flexible membrane that is formed on at least a portion of the second surface of the semiconductor substrate and that extends over the second opening, and a pair of actuator elements coupled to the flexible membranes and aligned with the cavity to selectively cause displacement of the first and second flexible membranes.

Abstract: A panel type display device for minimizing temperature increase in the interior of a case and a display panel. The display device includes a case, a display panel mounted in an interior of the case, at least one circuit board for controlling the display panel, a first cooling fluid path for cooling the display panel, and a second cooling fluid path for cooling the circuit board. In the display device, the first and second cooling fluid paths are separated from each other.

Abstract: An enclosure for electrical system includes a side plate and an adjusting piece movably attached to the side plate. The side plate includes a heat dissipating part in which a plurality of heat dissipating holes is defined. The adjusting piece is movable with respect to the heat dissipating part for covering portions of at least some of the heat dissipating holes. The enclosure provides a function of adjusting of heat dissipation and noise suppression of an electrical system.

Abstract: An airflow direction controlling apparatus includes a frame arranged near an outlet of a fan, at least one blade pivotably mounted to the frame and driven by a motor, at least two thermal sensors for detecting temperatures of at least two electronic components in a computer, and a control module electronically connected to the at least two sensors and the motor. The control module receives the detected temperatures from the sensors, determines if an electronic component is in danger of overheating, and controls the motor to rotate the at least one blade to a desired position where airflow of the fan blows toward the electronic component in danger of overheating, to quickly dissipate the heat generated by the electronic component.

Abstract: An anti-turbulent casing includes a plate and an airflow guiding element. The plate has a first surface and a second surface opposite to the first surface. The first surface faces outward, and the second surface faces an interior of an electronic device. In addition, the plate has an opening passing through the first surface and the second surface. The airflow guiding element is disposed on the plate and has a curved surface and two sidewall surfaces connected between the curved surface and the second surface, and the curved surface protrudes out of the second surface and extends on top of the opening. The airflow guiding element makes the cooling airflow in a state of laminar.