Description of the Related Art

[0001] Thermal management within portable electronic devices frequently consists of two steps: first, drawing the heat away from a heat producing component most frequently using a heat transfer fluid; and second, expelling the warm fluid from the portable electronic device without adversely affecting the operation of one or more internal or external components. Heat can be withdrawn from the heat producing devices either by direct convection to a cool fluid or by conduction to a thermal member such as a heat pipe or heat exchanger and thence to the cool fluid. The warm fluid exiting the heat producing device or heat exchanger must be expelled or rejected from the portable electronic device without adversely affecting the operation of other components or the functionality of the electronic device itself.

BRIEF DESCRIPTION OF THE DRAWINGS

[0002] Advantages of one or more disclosed embodiments may become apparent upon reading the following detailed description and upon reference to the drawings in which:

[0003] Fig. 1A is a perspective view depicting an illustrative flow diversion system, according to one or more embodiments described herein;

[0004] Fig 1 B is a detail view depicting an illustrative flow diversion catch, according to one or more embodiments described herein;

[0005] Fig. 2A is a partial sectional view depicting an illustrative flow diversion system, according to one or more embodiments described herein;

[0006] Fig. 2B is a partial sectional view depicting the illustrative flow diversion system depicted in Fig. 2A, according to one or more embodiments described herein; [0007] Fig. 2C is a partial sectional view depicting the illustrative flow diversion system depicted in Fig. 2A, according to one or more embodiments described herein;

[0008] Fig. 2D is a partial sectional view depicting the illustrative flow diversion system depicted in Fig. 2A, according to one or more embodiments described herein; and

[0009] Fig. 3 is a flow diagram depicting an illustrative flow diversion method, according to one or more embodiments described herein.

DETAILED DESCRIPTION

[0010] Heat is generated by heat producing electronic devices, such as central processing units ("CPUs") and graphical processing units ("GPUs") used in most portable electronic devices such as slate computers, laptop computers, netbooks, handheld gaming devices, and handheld cellular devices. The heat generated by such devices must be removed or otherwise dissipated to minimize the performance impact to the portable electronic device. Given the ever decreasing size of portable electronic device housings, heat removal becomes a significant undertaking. Heat is often removed from the portable electronic device by introducing a cool fluid such as air into the housing. Within the housing, the coo! fluid is heated by passage through or around heat producing devices and heat exchange devices, heating the fluid, and providing a warm fluid. Evacuating this warm fluid from the housing becomes problematic since passage of the warm fluid across components or devices disposed within the housing can adversely affect the performance or life of the component or device. Various flow diversion apparatuses and methods can be used to minimize the adverse effects of the warm fluid on components or devices disposed within the housing.

[0011] A flow diversion apparatus is provided. The apparatus can include a vent configured to permit the flow of a fluid therethrough. The apparatus can also include an electronic device capable of a range of motion across at least a portion of the vent disposed proximate at ieast a portion of the vent. The apparatus can further include a shutter disposed proximate at least a portion of the vent opposite the electronic device. The shutter can be capable of a range of motion across at Ieast a portion of the vent in conjunction with the electronic device. The shutter can prevent at least a portion of the fluid flowing through the vent from impinging upon the electronic device.

[0012] A flow diversion method is also provided. The method can include flowing a fluid through Ieast a portion of a vent having an electronic device disposed proximate thereto. The electronic device can be displaceable through a range of motion. The method can further include diverting at Ieast a portion of the fluid flow using a shutter disposable through the range of motion proximate the vent and opposite the electronic device. The shutter can prevent at Ieast a portion of the fluid flowing through the vent from impinging upon the electronic device.

[0013] A flow diversion system is also provided. The system can include a housing having a semicircular vent having a cross-sectional area adapted to permit the flow of a fluid therethrough. The system can further include an electronic device disposed proximate the vent, the electronic device hingedly connected to the housing; the hinge and the vent sharing a common central axis. The electronic device can be capable of a range of motion about the common central axis, across at least a portion of the vent. The system can also include a shutter that prevents at Ieast a portion of the fluid flowing through the vent from impinging upon the electronic device. The shutter can be capable of a range of motion about the common central axis having a semicircular section disposed proximate the vent, opposite the electronic device. The shutter can obstruct at Ieast a portion of the vent, thereby apportioning the vent into a closed cross-sectional area ("CSA") portion and an open CSA portion that is not reduced through the full range of motion of the shutter.

[0014] For clarity and ease of description, Figs. 1A and 1 B will be discussed in detail as a group. Fig. 1A is a perspective view depicting an illustrative flow diversion system 100, according to one or more embodiments. Fig 1 B is a detail view depicting an illustrative flow diversion catch 180, according to one or more embodiments. The system 100 can include a vent 110 disposed on an enclosure 180, an electronic device 120 disposed proximate the vent 1 10, and a shutter 130 opposite at least a portion of the electronic device 120 disposed proximate the vent 1 10 opposite at least a portion of the electronic device 120.

[0015] The vent 110 can have a cross sectional area 1 15 configured to permit the passage or flow of a fluid therethrough. The shutter 130 can be disposed proximate the vent 1 10, apportioning the vent into a closed cross-sectional area portion ("closed CSA") 140 and an open cross-sectional area portion ("open CSA") 150.

[0016] The electronic device 120 and the shutter 130 can be jointly or individually rotatable about an axis. In some embodiments, the electronic device 120 and the shutter 130 can be disposed such that they rotate about a common central axis 170. A tension member 190 can be used to bias the shutter 130 to a predetermined position. A catch 180 can be used to operably connect or mechanically link the electronic device 120 with the shutter 130.

[0017] An "operable connection", or a connection by which entities are "operably connected", is one in which the entities are connected in a manner whereby the one entity is in some way connected to a second entity. An operable connection can be directly between the first and the second entities, for example through the use of threaded fasteners, nails, chemical adhesives, weldment, or the like. A direct connection between the first and the second entities can be non-detachable, for example through the use of chemical adhesives or weldment, or detachable, for example through the use of removable fasteners such as threaded fasteners or cam-lock connectors. An operable connection can be indirectly between the first and the second entities via one or more intermediate entities, for example a piston can be operatively connected to a crankshaft via a connecting rod, an intermediate entity. [0018J One or more heat producing devices, for example one or more battery or line powered computing devices, can be at least partially disposed within the enclosure 180. During operation, the heat generated by the device can accumulate within the enclosure unless provisions are made to evacuate the heat from the enclosure. Such provisions often include the disposal of a vent 1 10 on the enclosure 180 to permit heat to escape. The vent 1 10 can be any shape, size, geometry or configuration adapted to permit the flow of a fluid, for example a thermal or heat transfer fluid, therethrough. Such fluids can include, without limitation, any gas, liquid, or multiphase fluid adapted to transport or convey at least a portion of the heat from the enclosure 180 to the surrounding environment. Air is an example of a gas, while a non-electrically conductive liquid is an example of a liquid.

[0019] As depicted in Fig. 1A, the electronic device 120 and the housing 180 can be operably connected by one or more hinges disposed along an axis of rotation ("axis"). Referring again to Fig. 1A, where the electronic device 120 and the housing 180 are connected using one or more hinges, at least a portion of the vent 1 10 can be disposed proximate the hinge. In some embodiments, the vent 1 10 can include a plurality of parallel slots coaxially aligned with the axis of rotation of the electronic device 120.

[0020] Warm fluid conveying the heat from the enclosure 180 can flow through at least a portion of the vent 1 10. In the absence of the shutter 130, at least a portion of the warm fluid escaping through the vent 1 10 would impact or impinge upon the electronic device 120. Under certain conditions, the flow of warm fluid across, around, or about the electronic device 120 may adversely affect or impact the operation of the electronic device 120. For example, where the enclosure 180 houses a portable computing device and the electronic device 120 is a liquid crystal display ("LCD") communicatively coupled to the portable computing device, the flow of warm fluid across the LCD can affect the color accuracy or color reproducibility of the LCD. The electronic device 120 can include any electrical device that could similarly suffer a performance degradation or failure due, at least in part, the heating attributable to the flow of warm fluid from the enclosure 180 via the vent 110.

[0021] At least a portion of the flow of warm fluid through the vent 110 can be diverted, interrupted, or otherwise redirected by the shutter 130. The shutter 130 can be a single or multi-piece member disposed proximate at least a portion of the vent 1 10. Since the electronic device 120 can be rotated or otherwise displaced about the axis of rotation of the hinge, at least a portion of the shutter 130 can be similarly rotatable or displaceable about a common axis of rotation ("common axis") 170. The operable connection between the electronic device 120 and the shutter 130 can be mechanical or electromechanical. In some embodiments a rotating catch 160 disposed along the common axis 170 as depicted in Fig. 1 B can be used to displace the shutter 130 in conjunction with the electronic device 120.

[0022] In some embodiments, the electronic device 120 and the shutter 130 can be operably connected such that a displacement of the electronic device 120 can result in a proportionate displacement of the shutter 130. For example a rotation of the electronic device 120 through an arc of a° can result in a comparable rotation of the shutter 130 through an arc of α ^ϋ , both arcs measured about the common axis 170. By operably connecting the electronic device 120 and the shutter 130, warm fluid exiting the enclosure 180 via the vent 1 10 and impacting or otherwise flowing around, across, or about the electronic device 120 can be reduced. By reducing the quantity of warm fluid flowing around, across, or about the electronic device 120, the temperature rise experienced by the electronic device 120 attributable to the flow of the warm fluid can be reduced.

[0023] As the shutter 130 is displaced across the vent 1 10, the shutter 130 will obstruct a portion of the vent 110, thereby preventing the flow of fluid therethrough. The shutter 130 can thereby apportion the vent into the closed CSA portion 140 and the open CSA portion 150. In some embodiments, the sum of the closed CSA portion 140 and the open CSA portion 150 can provide the total CSA 1 15 of the vent 1 10. In some embodiments, the CSA 1 15 can be apportioned into a closed CSA portion 140 having a fixed area and an open CSA portion 150 having a fixed area; thus, the open CSA portion 150 is not reduced throughout the full range of motion of the electronic device 120 and the shutter 130. By not reducing the open CSA portion 150, an exit path for the warm fluid flowing from the enclosure 180 exists at all times, regardless of the position of the electronic device 120 and shutter 130, thereby providing relatively consistent cooling of the heat producing electronic device disposed within the enclosure 180.

[0024] A tension member 190 can be used to bias the shutter 130 to a predetermined position. Biasing the shutter 130 to a predetermined position can afford a failsafe operation should the operable connection between the electronic device 120 and the shutter 130 be lost or otherwise fail. In some embodiments, the tension member 190 can position the shutter 130 in a default position diverting the warm fluid flowing from the vent 1 10 from impacting the electronic device 120 when the device is disposed in a "typical" or "common" operating position. For example if the electronic device contains an LCD display, the default position for the shutter 130 can be at an angle of about 40° to about 60°, the "typical" viewing angle of an LCD display.

[0025] For clarity and ease of description, Figs. 2A, 2B, 2C. and 2D will be discussed in detail as a group. Fig. 2A is a partial sectional view depicting an illustrative flow diversion system 200, according to one or more embodiments. Fig. 2B is a partial sectional view depicting the illustrative flow diversion system 200 depicted in Fig. 2A, according to one or more embodiments. Fig. 2C is a partial sectional view depicting the illustrative flow diversion system 200 depicted in Fig. 2A, according to one or more embodiments. Fig. 2D is a partial sectional view depicting the illustrative flow diversion system 200 depicted in Fig. 2A, according to one or more embodiments.

[0028] The flow diversion system 200 can include a computing device 210 disposed at least partially within the enclosure 180. The enclosure 180 can be communicatively coupled and operably connected to the electronic device 120 via one or more hinges. The electronic device 120 can be rotatably displaceable through an arc 220 about a common axis 170. The computing device 210 can include at least one heat producing device and can include at least one fluid mover configured to draw a fluid across the at least one heat producing device to provide a warm fluid 230. The warm fluid 230 can exit the enclosure 180 via the open CSA portion 150 of the vent 1 10 disposed proximate the hinge, thereby providing at least one exhaust 240.

[0027] As discussed in detail above with regards to Figs. 1A-1 B, the shutter 130 can apportion the vent 1 10 into a closed CSA portion 140 and an open CSA portion 150. Referring to Figs. 2A-2D, as the electronic device 120 is rotated about the common axis 170, the shutter 130 can rotate in conjunction with the electronic device, causing at least a portion of the exhaust 240 to flow in a direction that minimizes the impingement of the exhaust 240 on the electronic device 120.

[0828J Fig. 3 is a flow diagram depicting an illustrative flow diversion method 300, according to one or more embodiments. The flow diversion method 300 can include flowing 310 a fluid 230 through at least a portion of a vent 110, for example through an open CSA portion 150 of the vent 1 10. An electronic device 120, for example a display device, can be displaceable through a range of motion, for example an arc 220, and can be disposed proximate the vent 1 10.

[0029] The method can also include diverting 320 at least a portion of the fluid 230 using a shutter 130 to provide an exhaust 240. The shutter 130 can be operably connected to the electronic device 120 in such a manner that any displacement of the electronic device 120 causes a similar displacement of the shutter 130. Thus, regardless of the position of the electronic device 120 and shutter 130, the exhaust 240 can be diverted such that at least a portion of the exhaust does not impinge upon the electronic device 120.

[0030] Certain embodiments and features have been described using a set of numerical upper limits and a set of numerical lower limits. It should be appreciated that ranges from any lower limit to any upper limit are contemplated unless otherwise indicated. Certain lower limits, upper limits and ranges appear in one or more claims below. All numerical values are "about" or "approximately" the indicated value, and take into account experimental error and variations that would be expected by a person having ordinary skill in the art.

[0031 ] While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.