Abstract: An interposer includes a planar substrate and a pad array formed on a bottom side of the planar substrate to connect with a pin array within a CPU socket. A serial computer expansion bus connector is formed on the top side of the planar substrate and is electronically coupled to a portion of the pad array. The interposer further includes a perimeter structure adapted for securing to a CPU carrier. The interposer may be included in a kit with a heatsink securable to the CPU socket, wherein the heatsink includes a contact area for contacting the interposer and applying a load to the interposer. A printed circuit board assembly may include first and second CPU sockets that are connected by a CPU interconnect, where the interposer may be installed in the first CPU socket and a CPU may be installed in the second CPU socket.

Abstract: A semiconductor device comprises a power device, a sensor which measures a physical state of the power device to transmit a signal according to the physical state, and a main electrode terminal through which a main current of the power device flows. The semiconductor device further comprises a sensor signal terminal connected to the sensor for receiving a signal from the sensor, a driving terminal which receives driving power for driving the power device, and an open bottomed case which houses the power device, the sensor, the main electrode terminal, the sensor signal terminal and the driving terminal. The first and second terminals electrically conduct with each other to form a double structure. Also, the sensor signal terminal and the driving terminal each have a first terminal and a second terminal which are not embedded within the case.

Abstract: A pluggable module includes a pluggable body extending lengthwise between a mating end and a cable end. The pluggable body has a first end and an opposite second end with sides extending therebetween along a length of the pluggable body. The first end, second end and sides define a cavity. An internal circuit board is held in the cavity. The internal circuit board is provided at an end of a cable communicatively coupled to the internal circuit board. The pluggable body is configured to be plugged into a receptacle assembly such that the internal circuit board is communicatively coupled to a communication connector of the receptacle assembly. The pluggable body is defined by a first shell including the first end and the sides and may be formed by extrusion and may have increased thermal conductivity and a second shell including the second end.

Abstract: A desktop computing system having at least a central core surrounded by housing having a shape that defines a volume in which the central core resides is described. The housing includes a first opening and a second opening axially displaced from the first opening. The first opening having a size and shape in accordance with an amount of airflow used as a heat transfer medium for cooling internal components, the second opening defined by a lip that engages a portion of the airflow in such a way that at least some of the heat transferred to the air flow from the internal components is passed to the housing.

Abstract: A pluggable module housing assembly comprises a base at least partially surrounding a socket having an entrance sized and dimensioned to receive a pluggable module. At least one guide extends adjacent to the socket. A heat sink assembly includes a riding heat sink having a module-contacting surface facing the socket, and an actuating assembly coupled to the base and to the riding heat sink. The actuating assembly is configured to move the riding heat sink relative to the base between a deployed position a first distance from the at least one guide, and a stowed position a second distance from the at least one guide, the second distance being greater than the first distance.

Abstract: A power converter arrangement has two static switching element bridges that are alternatively operable and comprise static switching elements. The power converter arrangement has one housing that houses the two static switching element bridges; the housing has one cooling system for the static switching element bridges housed therein.

Abstract: A semiconductor control device is provided with: a plurality of semiconductor modules each having a cooling member and a semiconductor element; a circuit board mounted with a control element that controls the plurality of semiconductor modules; and a case in which the plurality of semiconductor modules and the circuit board are respectively mounted. The case is provided with a cylindrical sidewall that forms an internal space within the case, and on both ends of the sidewall, a first opening and a second opening are correspondingly formed to be opposite to each other. The plurality of semiconductor modules include a first semiconductor module mounted on the sidewall on a side of the first opening, and a second semiconductor module mounted on the sidewall on a side of the second opening. The circuit board is positioned between the first semiconductor module and the second semiconductor module, in the internal space.

Abstract: A semiconductor device includes an insulating substrate including a first surface and an opposing second surface, and a semiconductor chip. The semiconductor chip is mounted over the first surface, includes signal electrodes, power-supply electrodes and ground electrodes, which connect to pads on the first surface of the insulating substrate. Lands provided on the second surface of the insulating substrate include signal lands, power-supply lands and ground lands through vias penetrate from the first surface to the second surface of the insulating substrate, and include signal vias electrically connected the signal connection pads to the signal lands, power-supply vias electrically connected the power-supply connection pads to the power-supply lands and ground vias electrically connected the ground connection pads to the ground lands. At least one of the signal vias are closer to the connection pads than immediately adjacent one of the power-supply vias or the ground vias.

Abstract: Electronic devices having a multi-layer structure that provides enhanced conductivity (thermal and/or electrical conductivity) are disclosed. The multi-layer structure can have a plurality of adjacent layers. At least one layer can primarily provide structural rigidity, and at least another layer can primarily provide enhanced conductivity. The layer of high conductivity can serve to provide the electronic device with greater ability to disperse generated heat and/or to provide an accessible voltage potential (e.g., ground plane). Advantageously, the multi-layer structure can provide enhanced conductivity using an otherwise required structural component and without necessitating an increase in thickness.

Abstract: A DC-DC converter is provided with a transformer provided with a primary coil and a secondary coil; switching elements connected to the primary coil for switching the flow of electrical current to the primary coil; rectifying elements connected to the secondary coil; a case having a first accommodating portion in which the transformer is accommodated and a second accommodating portion in which the switching elements and the rectifying elements are accommodated; and a metal heat sink mounted on the case, the metal heat sink being thermally connected to the switching elements and the rectifying elements and having a radiator portion exposed on the outer surface of the case.

Abstract: An electronic control unit is configured in such a way that the groove-shaped concave portion of the second case member includes a first concave portion, in which a groove width at a bottom surface side is narrow, and a second concave portion, in which a groove width at an aperture surface side is wide, and the first concave portion and the second concave portion are linked by an inclined step portion in such a way that a groove width at the step portion is increased in a direction from the bottom surface side to the aperture surface side, and moreover, a tip of the rail-shaped convex portion of the first case member is fitted into the first concave portion at the bottom surface side of the second case member.

Abstract: A heat dissipation structure includes a ceramic substrate having an insulation quality, a metal member containing a metal or an alloy and joined to a surface of the ceramic substrate by a brazing material, a metal film layer formed by accelerating a powder containing a metal or an alloy with a gas and by spraying and depositing the powder in a solid phase state on a surface of the metal member, and a heat pipe that is in a rod shape and capable of controlling a temperature and comprises a heat absorbing unit configured to absorb heat from outside at one end of the heat pipe and a heat dissipating unit configured to dissipate heat to the outside at another end of the heat pipe, wherein the heat absorbing unit is embedded inside the metal film layer.

Abstract: An integrated appliance is disclosed in the present disclosure. The integrated appliance comprises a backplate and a circuit board. The circuit board comprises a baseplate and an electronic component disposed on the baseplate. The baseplate is fixed to an inner wall of the backplate, and the electronic component is located between the baseplate and the backplate. With the aforesaid arrangement, an uneven surface structure of the backplate itself is utilized in the integrated appliance of the present disclosure to dispose the circuit board on the inner wall of the backplate in such a way that the electronic component on the circuit board is disposed facing towards an inner wall surface of the backplate. As this eliminates the use of the back cover, the structure is simplified and both the mold cost and the material cost associated with the back cover are saved, thus resulting in a reduced manufacturing cost.

Abstract: An illumination device including a light emitting element and a lighting control circuit on a metal base flexible printed circuit board (FPC) that is formed by integrating a flexible metal base with a flexible printed circuit board which is formed by integrating a copper foil pattern (conductive body) with films, wherein end portions of the metal base FPC are formed as thick terminal portions so that the end portions are thicker than the metal base FPC.

Abstract: A display device having a thinner shape and a uniform luminance includes a display panel that displays images. The display device has upper and lower peripheral regions. A printed circuit board (PCB) is positioned at the back of the display panel to control and drive the display panel and to provide power to the display panel. A thermal conductive sheet is attached to the back of the display panel. In the display device, the thermal conductive sheet includes a base film that is attached to the back of the display panel and is formed of an electrical insulating material. A power supply pattern is formed on the base film to provide power to the display panel. A ground pattern is formed to be spaced apart and electrically insulated from the power supply pattern.

Abstract: In a display apparatus, a display panel displays an image, and a driver is electrically connected to the display panel and applies a control signal to the display panel to control an operation of the display panel. A first cover member includes a nonmetal material and covers the display panel. An opening is defined in the first cover member and exposes a display area of the display panel. A heat discharge member is coupled to the first cover member and contacts the driver to discharge a heat generated by the driver.

Abstract: A LED module with separate heat-dissipation and electrical conduction paths is disclosed, having a metal substrate; a plastic layer, comprising one or more hollow regions, and attached to the metal substrate; one or more conducting elements attached to the plastic layer; one or more LED chips positioned in the one or more hollow regions of the plastic layer and directly attached to the metal substrate; and a plurality of conducting wires for electrically connecting the one or more conducting elements and the one or more LED chips; wherein inner sides of the one or more hollow regions comprise one or more inclined surfaces each having an included angle with an upper surface of the metal substrate, and the included angle is between 90-180 degrees.

Abstract: The present invention provides an electric circuit device in which it is possible to achieve simultaneously the improvement of cooling performance and reduction in operating loss due to line inductance. The above object can be attained by constructing multiple plate-like conductors so that each of these conductors electrically connected to multiple semiconductor chips is also thermally connected to both chip surfaces of each such semiconductor chip to release heat from the chip surfaces of each semiconductor chip, and so that among the above conductors, a DC positive-polarity plate-like conductor and a DC negative-polarity plate-like conductor are opposed to each other at the respective conductor surfaces.

Abstract: In two systems of three-phase alternating-current inverter devices that drive a motor, power elements on power supply sides of bridge circuits are mounted on unit bases to constitute upper arm units. Power elements on ground sides of the bridge circuits are mounted on unit bases to constitute lower arm units. The upper arm units and the lower arm units are arranged separately on upper surfaces and outside surfaces of heat dissipation blocks of a heat sink. Heats generated by the power elements do not interfere with each other and are emitted to the heat sink, whereby heat dissipation performance of the power elements constituting the bridge circuits is improved.

Abstract: An electronic device includes a substrate (101), a conductor plane (104) which is provided on an inner layer of the substrate (101), an electronic circuit (102) which is mounted on the substrate (101), a heat sink (103) which is mounted on an upper surface of the electronic circuit (102), includes a portion which does not overlap with the electronic circuit (102) when seen in a plan view, faces the conductor plane (104), and is configured of a conductive material, a conductor via (105) which is connected to the heat sink (103) on a surface of the heat sink (103) contacting the electronic circuit (102), and extends toward the conductor plane (104), and a stub (106) which is connected to the conductor via (105) and extends to face the conductor plane (104).

Abstract: Disclosed herein is a heat radiating substrate including: a heat radiating plate including a plurality of holes having a predetermined depth and formed in a lower portion of one side thereof; a conductor pattern layer formed on the heat radiating plate and including a mounting pad on which a control device and a power device are mounted and a circuit pattern; and an insulating layer formed between the heat radiating plate and the conductor pattern layer.

Abstract: An electronic device includes a metallic body, a circuit substrate having electronic components and wiring conductors, a heat conduction member that absorbs a heat generated by the electronic components, and a heat radiation member provided between the metallic body and the heat conduction member. The heat radiation member includes a heat introduction portion surface-contacted with the heat conduction member, a heat discharge portion surface-contacted with the metallic body, and a heat conduction portion that conducts the heat from the heat introduction portion to the heat discharge portion. The heat conduction portion is provided to be separated from the wiring conductors so as not to electromagnetically couple to the wiring conductors.

Abstract: A cooling apparatus for a power electronics system includes a jet plate, a target plate, a plurality of fluid collection passageways, and a fluid outlet. The jet plate includes an array of impingement jets having a jet body and an impingement jet channel. The target plate includes an array of microchannel cells having a plurality of radially-extending wavy-fin microchannels. The coolant fluid is directed toward an impingement location through the array of impingement jets and travels through the wavy-fin microchannels. The plurality of fluid collection passageways are arranged in a grid pattern such that the coolant fluid exits the wavy-fin microchannels and flows into the plurality of fluid passageways. The coolant fluid exits the cooling apparatus through the fluid outlet. The cooling apparatus may be incorporated into a power electronics module having a power electronics device to cool the power electronics device.

Abstract: A thermally enhanced electronic package comprises a driver chip, an insulator, a flexible carrier, and carbon nanocapsules. The flexible carrier includes a flexible substrate, a wiring layer formed on the substrate, and a resistant overlaying the wiring layer. The driver chip is connected to the wiring layer. The insulator is filled in the gap between the driver chip and the flexible carrier. The carbon nanocapsules are disposed on the driver chip, on the resistant, on the flexible carrier, or in the insulator to enhance heat dissipation of electronic packages.

Abstract: Electronic assemblies and methods of fabricating electronic assemblies are provided herein. The electronic assembly includes a heat sink, a metal layer, and an electrical insulator layer. The metal layer defines at least a portion of an electrical circuit. The electrical insulator layer is disposed between the heat sink and the metal layer and is directly bonded to the heat sink.

Abstract: A circuit board unit of an ECU has an upper surface on which semiconductor elements are installed, a lower surface that is on the opposite side of the circuit board unit from the upper surface, and a cutout portion that is formed below the upper surface. A power module includes a conductive protruding piece and an electrically insulating main portion that holds the protruding piece. The conductive protruding piece is inserted in the cutout portion to support the circuit board unit, and is electrically connected to the semiconductor elements.

Abstract: Provided is a small and low-cost resin-sealed electronic control device including a first electronic board and a second electronic board respectively bonded onto an upper surface and a lower surface of a support plate, each of the first electronic board and the second electronic board having an increased mounting area on which circuit components are mounted. A first electronic board (30A) and a second electronic board (40A) respectively bonded onto an upper surface and a lower surface of a support plate (20A) include outer circuit components (31, 41) and inner circuit components (33, 43) respectively mounted on outer surfaces and inner surfaces thereof. The inner circuit components (33, 43) are fitted into a window hole portion (21) of the support plate (20A) and are sealed with a filler (25).

Abstract: A heat sink assembly comprises a plurality of components and a plurality of mounting tabs. A component attachment surface of each mounting tab is attached to a component and heat sink attachment surfaces of the plurality of mounting tabs are at least substantially coplanar. A heat sink element is attached to at least some of the plurality of mounting tabs at the heat sink attachment surface thereof. A method of assembling a heat sink assembly comprises attaching a plurality of mounting tabs to at least one substantially planar assembly surface of an assembly fixture. Each mounting tab is attached to a heat-generating component to form a mechanical and thermal coupling therebetween. The assembly fixture is removed from the plurality of mounting tabs, and a heat sink element is attached to mounting tabs of the plurality.

Abstract: An electronic device may be provided with a display cover layer mounted to the device using an adhesive bond with a display. The display may be a flexible display. The flexible display may include Organic Light Emitting Diode display technology. The display may be mounted to a rigid support structure. The rigid support structure may be mounted to a device housing member. Mounting the display cover layer to the display may eliminate the need to mount the display cover layer to the device housing and may allow active display pixels to be visible under the display cover layer closer to the device housing than in conventional devices. Providing the electronic device with active display pixels closer to the device housing may reduce the need for an inactive border around the display and may improve the aesthetic appeal of the electronic device.

Abstract: A mechanical arrangement for use in implementing a galvanically-isolated, low-profile micro-inverter primarily, though not exclusively, intended for use with solar panels. The micro-inverter contains a circuitry assembly having a planar transformer formed of two abutting E-shaped core halves, and a chopper device assembly with all chopper devices mounted to a common thermally-conductive plate. To provide passive cooling, heat conduction paths are established, via separate compressive thermally-conductive pads, from a top surface of a top core half of the transformer and from a bottom surface of the conductive plate to large-area portions of opposing internal surfaces of top and base portions, respectively, of an enclosure.

Abstract: A tamper respondent module includes a basecard adapted to be inserted into a slot in a rack enclosure comprising at least one guide edge, at least one electrical coupler, a surface and at least one electronic component that contains information in an electronic format. In one example, an outer cover is coupled to the basecard and includes at least five sides. The outer cover is arranged in a covering relationship over the at least one electronic component. In another example, an anti-tamper apparatus is disposed between the outer cover and the surface. In another example, an anti-tamper circuit is electrically coupled to the at least one electronic component. In another example, a thermal frame is thermally coupled to the at least one electronic component.

Abstract: A power converter arrangement has two static switching element bridges that are alternatively operable and comprise static switching elements. The power converter arrangement has one housing that houses the two static switching element bridges; the housing has one cooling system for the static switching element bridges housed therein.

Abstract: A temperature control unit for an electronic component and a handler apparatus, which are excellent in responsibility during cooling and heating, is obtained. The temperature control unit for an electronic component includes a cooling cycle device having a refrigerant passage circulating through a compressor, a condenser, an expander, and an evaporator; a thermally conductive block having an outer surface capable of coming in contact with the electronic component that is an object to be temperature-controlled, where an inner surface corresponding to the outer surface is placed opposite to the outer surface so as to be brought in contact with or apart from the evaporator; at least one first heater for heating the thermally conductive block; and a compressed air feeding circuit for feeding compressed air between facing surfaces of the evaporator and the thermally conductive block to part them.

Abstract: An electronic circuit device includes a bus bar, a base component and an electronic component. The bus bar has an external connector terminal capable of receiving electric power from an external power source. The base component has a metallic heat radiation portion and is disposed to oppose the bus bar. The electronic component is held between the bus bar and heat the radiation portion of the base component. The bus bar further includes fixing terminals extending toward the base component. The fixing terminals are fixed to the base component to constitute fixing portions. The fixing portions are configured to have elasticity and exert a restoring force such that a distance between the bus bar and the base component reduces. The electronic component is in pressure contact with the bus bar and the base component by the restoration force of the elasticity of the fixing portions.

Abstract: Disclosed is a heat dissipating circuit board, which includes a metal core including an insulating layer formed on the surface thereof, a circuit layer formed on the insulating layer and including a seed layer and a first circuit pattern, and a heat dissipating frame layer bonded onto the circuit layer using solder and having a second circuit pattern, and in which the heat dissipating frame layer is bonded onto the circuit layer not by a plating process but by using solder, thus reducing the cost and time of the plating process and relieving stress applied to the heat dissipating circuit board due to the plating process. A method of manufacturing the heat dissipating circuit board is also provided.

Abstract: Disclosed is a thermally conductive, electrically insulating composite film, including interface layers disposed on the top and bottom surface of a metal substrate, and an insulation layer. Because the film has thermal conductivity and electric insulation properties, it can be disposed between the chips of a stack chip package structure, thereby dissipating the heat in horizontal and vertical directions simultaneously.

Abstract: The present invention relates to a device adapted in order to decrease stress on connection points between a heat generating source and a substrate. The device 13 comprises a larger heat-dissipating part 7, and at least one smaller heat-dissipating part 6. The larger part 7 is arranged with at least one cavity 8 for housing the at least one smaller part 6. The at least one smaller part 6 is adapted to be attached to at least one heat-generating source 2, and at the same time more mobile in the cavity 8 and/or less affected by changes in temperature than the larger part.

Abstract: An electronic module is employed with at least one interiorly positioned fastener that at least partially secures a central region of the electronic module to an object to prevent bowing or warping. The module contains a base, at least two peripheral fasteners at opposed ends of the module, and the at least one interiorly positioned fastener, wherein the base is capable of accepting electronic components and further includes at least one layer, and wherein the at least one interiorly positioned fastener is interposed between the at least two peripheral fasteners.

Abstract: A double-sided printed circuit board may include: electrical conductor tracks fitted thereon and serving for electrically connecting components mounted on the printed circuit board, which has at least one conductor track fuse in the form of a conductor track with a fusible link part, wherein, upon the occurrence of an abnormal operating state, in particular an electrical short circuit, the electric circuit is interrupted by melting and evaporation of the fusible link part and plasma arises upon the evaporation of the fusible link part, wherein the fusible link part lies on the other side of the printed circuit board with respect to the supply line.

Abstract: A heat sink assembly comprises a plurality of components and a plurality of mounting tabs. A component attachment surface of each mounting tab is attached to a component and heat sink attachment surfaces of the plurality of mounting tabs are at least substantially coplanar. A heat sink element is attached to at least some of the plurality of mounting tabs at the heat sink attachment surface thereof. A method of assembling a heat sink assembly comprises attaching a plurality of mounting tabs to at least one substantially planar assembly surface of an assembly fixture. Each mounting tab is attached to a heat-generating component to form a mechanical and thermal coupling therebetween. The assembly fixture is removed from the plurality of mounting tabs, and a heat sink element is attached to mounting tabs of the plurality.

Abstract: In a circuit board disposed in parallel to a fixing plane, a guard spacer (abutting member) is disposed on a multi-layer printed circuit board on the side of the fixing plane to suppress deformation of the multi-layer printed circuit board to prevent short circuit if an impact is applied to the circuit board. The guard spacer may be a dummy electronic component or a plate member. An image display using the circuit board is also disclosed.

Abstract: Disclosed is a heat dissipating circuit board, which includes a metal core including an insulating layer formed on the surface thereof, a circuit layer formed on the insulating layer and including a seed layer and a first circuit pattern, and a heat dissipating frame layer bonded onto the circuit layer using solder and having a second circuit pattern, and in which the heat dissipating frame layer is bonded onto the circuit layer not by a plating process but by using solder, thus reducing the cost and time of the plating process and relieving stress applied to the heat dissipating circuit board due to the plating process. A method of manufacturing the heat dissipating circuit board is also provided.

Abstract: The present invention relates to a wiring member including: a copper foil layer having a smooth surface with a surface roughness Rz of 2 ?m or less; a noise suppressing layer containing a metallic material or a conductive ceramic and having a thickness of 5 to 200 nm; and an insulating resin layer provided between the smooth surface of the copper foil layer and the noise suppressing layer, and also relates to a printed wiring board equipped with the wiring member.

Abstract: A mechanical arrangement for use in implementing a galvanically-isolated, low-profile micro-inverter primarily, though not exclusively, intended for use with solar panels. The micro-inverter contains a circuitry assembly having a planar transformer formed of two abutting E-shaped core halves, and a chopper device assembly with all chopper devices mounted to a common thermally-conductive plate. To provide passive cooling, heat conduction paths are established, via separate compressive thermally-conductive pads, from a top surface of a top core half of the transformer and from a bottom surface of the conductive plate to large-area portions of opposing internal surfaces of top and base portions, respectively, of an enclosure.

Abstract: A heat dissipating device is used in an electronic apparatus. The electronic apparatus includes a standby unit and a power supply. The heat dissipating device includes a delay unit connected to the standby unit, a switch connected to the delay unit and the power supply, and a heat sink connected to the switch. The delay unit turns on the switch when the electronic apparatus operates in a working mode, and the delay unit turns off the switch after a predetermined delay time when the electronic apparatus enters a standby mode.

Abstract: A semiconductor structure for dissipating heat away from a resistor having neighboring devices and interconnects. The semiconductor structure includes a semiconductor substrate, a resistor disposed above the semiconductor substrate, and a thermal protection structure disposed above the resistor. The thermal protection structure has a plurality of heat dissipating elements, the heat dissipating elements having one end disposed in thermal conductive contact with the thermal protection structure and the other end in thermal conductive contact with the semiconductor substrate. The thermal protection structure receives the heat generated from the resistor and the heat dissipating elements dissipates the heat to the semiconductor substrate.

Abstract: An electronic assembly includes a heat source having a maximum operating temperature, a heat dissipating device, a thermal interface material sandwiched between the heat source and the heat dissipating device. The thermal interface material includes a base and a plurality of first thermally conductive particles dispersed in the base. The first thermally conductive particles have a size monotonically changing from a first size less than 100 nanometers and a first melting temperature below the maximum operating temperature, to a second size larger than 100 nanometers and a second melting temperature above the maximum operating temperature when the heat source operates at a temperature above the first melting temperature and at or below the maximum operating temperature.

Abstract: A heat sink 109 is configured by a plate component having a combined structure composed of a recess and a projection formed thereon, wherein the recess is formed by allowing a part of the plate component to be set back from the surface level of the residual region, and the projection is formed on one surface of the plate component with the progress of formation of the recess, so as to be built up above the level of the residual region of the one surface.

Abstract: A power supply provides a low touch-temperature surface by utilizing a plurality of spaced apart pegs which extend from a surface of a case away from heat generating components enclosed within the case. The top and side surfaces of the pegs and the surface of the case not occupied by the pegs are entirely directly exposed to ambient air. The tops of the pegs provide a touch surface having a temperature which is cooler than that at the base of the pegs. The pegs are preferably arranged to minimize heat transfer between adjacent pegs.

Abstract: An inverter device has a control unit, a power unit, and a capacitor unit. The power unit has six semiconductor devices. Each semiconductor device has a semiconductor module and a pair of heat sinks disposed in both sides of the semiconductor module. The heat sinks are arranged in a ventilation path of cooling air. An, accommodation chamber of a control unit 1b communicates with the ventilation path of the cooling air.