1. Technical Field
This invention relates generally to electronic equipment. More particularly, this invention relates to a protective case for electronic equipment such as planar tablet computing devices or smart phones. Specifically, this invention is directed to a protective case for electronic devices which includes a heat dissipating assembly for removing heat generated by the electronic device from the protective case.
2. Background Information
One of the problems experienced by users of personal tablet type computing devices is that these devices tend to generate a substantial amount of heat during operation. In order for the device to operate properly, it is necessary that heat generated by the device be able to escape therefrom in order to keep the operating temperature at a safe level. Many people using these devices have started to place them in cases to protect them from impacts. While these cases may protect the electronic devices from damage due to impact and may aid in preventing damage to the screens thereof, there is a problem in that the cases tend to capture heat generated by the device during operation. This is especially problematic in particular brands of tablet type computing devices. The heat build-up may, over time, ultimately cause d complete failure of the electronic device.
There is therefor a need in the art for an improved protective cover that reduces the possibility of heat build-up damage to electronic devices placed therein.
The device of the present invention is a protective case for an electronic device such as a tablet or smartphone. The case includes a back having an interior surface and an exterior surface; an opening defined in the exterior surface; and a pocket defined between the interior and exterior surfaces. The case further includes a heat dissipating assembly disposed adjacent the opening. This assembly draws heat from the electronic device and transmits that heat to the air surrounding the case. The case may also include a front which is connected to the back via a spine. The spine allows the front and back to be positioned one on top of the other. A flap may also cover the opening in the back and be movable between open and closed positions. Preferably, the heat dissipating assembly includes a copper sheet that is retained within a sleeve that is inserted into the pocket in the back.
The heat dissipation assembly preferably further includes a plurality of apertures defined within the sleeve that surrounds the copper sheet. Additionally, apertures may be defined in the back and these apertures preferably are aligned with the apertures in the sleeve.
In a second embodiment of the invention the heat dissipation assembly includes a band of heat conductive material which extends through an opening in the back and is disposed adjacent an exterior surface of the back. Preferably two bands of copper are positioned partially within the pocket of the case and partially adjacent the exterior surface of the back. Heat from the electronic device is transferred to those regions of the copper bands that lie within the pocket and the heat so transferred travels along the copper bands to the portions thereof that lie adjacent the exterior surface. The heat in the portions of the copper bands outside the case is transmitted to the surrounding air.
In a third embodiment of the invention the flap and back also include apertures which align with apertures in the sleeve. Heat generated by the electronic device is transferred through the air in the pocket to the heat dissipation member. The heat dissipation member then transmits the heat to the air in the aligned apertures in the sleeve, back and flap, and thereby to the air surrounding the case. Heat is transferred to the surrounding air by the heat dissipation member via conduction, radiation, and to a lesser extent by convection (through the air in the aligned apertures being heated and then transferring the heat to the surrounding air).
A preferred embodiment of the invention, illustrated of the best mode in which Applicant contemplates applying the principles, is set forth in the following description and is shown in the drawings and is particularly and distinctly pointed out and set forth in the appended claims.
Similar numbers refer to similar parts throughout the drawings.
Referring to
As indicated above, front 12 includes an interior layer 12a and exterior layer 12b. One or more additional layers of material, such as layers 12c (
Similarly, as indicated above, back 14 includes an interior layer 14a, an exterior layer 14b. Back 14 further includes one or more additional layers 14c. Layers 14c preferably include one layer of a rigid or stiff material and one or more layers of padding material. Exterior layer 14b and layers 14c preferably are secured together along their peripheral edges in a suitable manner, such as by stitching 14d (
In accordance with a specific feature of the present invention, interior layer 14a is spaced a distance away from exterior layer 14b and the one or more layers 14c. Thus, a gap 35 (
Spine 16 comprises at least one layer of material that has an interior surface 16a and an exterior surface 16b. Preferably, as shown in
Front 12 includes one or more layers of material that are connected to interior layer 12a along three edges and which form pockets 18 on interior layer 12a. Pockets 18 are suitable for retaining papers and the like for safekeeping.
In accordance with a specific feature of the present invention, interior layer 14a of back 14 defines an aperture 32 therein. Aperture 32 is generally rectangular in shape and spaced a distance from the peripheral edge of interior layer 14a. Thus, interior layer 14a effectively forms a frame 30 around aperture 32. Frame 30 bounds and defines aperture 32. The first edge of frame 30 is identified by the reference character 30a, the second edge by the reference character 30b, the third edge by the reference character 30c, and the fourth edge by the reference character 30d. A single strip 31d is provided along fourth edge 30d of frame 30. Strip 31d is fixedly secured by stitching to interior layer 14a and an interior portion of this strip (i.e., the opposite surface to the one visible in
Aperture 32 defined by frame member 30 is configured to be sufficiently large enough so that substantially the entire screen 34a of electronic device 34 is able to be seen therethrough as is shown in
A closure member 39 is provided to secure front 12 and back 14 together when the interior layers 12a, 14a thereof are disposed adjacent each other. Closure member 39 comprises a strap that is fixedly secured at one end to exterior surface 14b of back 14; and mating snap-connectors 39a (on the strap) and 39b (on exterior surface 12b of front 12). When case 10 is moved to a closed position and the snap-connectors 39a, 39b are engaged, closure member 39 ensures that front 12 and back 14 are not able to move away from each other until the user is ready to operate electronic device. In this way, front 12 is kept in a position where it covers and therefore protects screen 34a. Additionally, electronic device 34 is prevented from accidentally sliding out of pocket 33.
In accordance with yet another feature of case 10, an opening 20 is defined in back 14. Opening 20 extends through exterior layer 14b and layers 14c and is therefore configured to be in fluid communication with pocket 33. Opening may be of any desired shape and size, such as the generally square shape shown in
In accordance with a specific feature of the present invention, protective case 10 further includes a heat dissipation assembly 52 (
Heat dissipation assembly 52 comprises a sleeve 40 and a heat dissipation member 44 that is retained within sleeve 40. Sleeve 40 include a first layer 41 and a second layer 43 that are secured together so as to form a pocket (not shown) into which heat dissipation member 44 is received. Sleeve 40 preferably is fabricated from a mesh type of material. One of the layers 43 includes a region 43a that extends outwardly beyond a side edge of layer 41. This region 43a is sized to be received along spine 16 when heat dissipation assembly 52 is inserted into pocket 33 of case 10. Region 43a may be fixedly secured to interior surface 16a of spine 16 or may be temporarily secured thereto by hook and loop fasteners, for example. Preferably, a surface of region 43a that is disposed away from interior surface 16a is also provided with a hook and loop fastener that is matingly engageable with the hook and loop fastener on strip 31d.
In accordance with a specific feature of the present invention, each layer 41, 43 of sleeve 40 defines one or more apertures therein which extend between an interior surface and an exterior surface of the respective layer 41, 43. Preferably, each layer 41, 43 defines a plurality apertures 42 therein. Still further, each aperture 42 in layer 41 preferably is aligned with an aperture 42 in layer 43. The aligned pairs of apertures 42 provide a plurality of through holes in sleeve 40. Apertures 42 are defined at intervals in layers 41, 43, preferably in a geometric pattern such as the rows and columns illustrated in
Heat dissipation member 44 preferably comprises a planar sheet of a heat conductive material that is suitable for conducting heat that is generated by electronic device 34 away therefrom. Suitable materials that may be used for this purpose include a wide array of metallic substances. Most particularly, such substances preferably are highly heat conductive. One particularly suitable material for this purpose is a planar copper sheet. It will be understood that the heat dissipation member 44 may be made from materials other than metal and may instead be comprised of materials which are actively cooled by internal mechanisms, either physical or chemical in nature, and thereby are able to draw away heat generated by electronic device 34.
During fabrication of heat dissipation assembly, the sheet of copper is inserted into the pocket of the sleeve 40 and access to that pocket is then closed so that the copper sheet 44 cannot slide out of the same. When heat dissipation assembly is inserted into pocket 33 of case 10, apertures 42 in layer 41 of sleeve 40 are in fluid communication with pocket 33 and will therefore be disposed adjacent rear surface 34b of electronic device 34. Apertures 42 in layer 43 of sleeve 40 will be in fluid communication with opening 20. The heat dissipation member 44 is thus positioned between the apertures 42 in layer 41 and the apertures 42 in layer 43. The fabric of sleeve 40 (i.e., from which layers 41 and 43 are fabricated) provides an insulating layer between rear surface 34b of electronic device 34 and copper sheet 44. Otherwise, heat transferred from electronic device 34 would simply flow into copper sheet 44 and then be transmitted to all regions of rear surface 34b of electronic device 34 instead of being removed therefrom. The heat from electronic device 34 will instead heat up the air in apertures 42 adjacent rear surface 34b; that heat will heat up copper sheet 44 which in turn will heat up air in apertures 42 adjacent opening 20. Thus heat from electronic device 34 will be transmitted to the outside air through opening. Since copper is a far superior transmitter of heat than is air, the heat will be more rapidly dissipated from electronic device than would be the case if the copper sheet 44 was not provided.
Referring to
The device of the present invention is used in the following manner. The user disengages closure member 39 and rotates front 12 away from back 14 so that case 10 is in the open position shown in
The user is then able to use electronic device 34 and as they do so, heat generated by device 34 is transferred by radiation and conduction to heat dissipation member 44. The heat drawn away from electronic device 34 by heat dissipation member 44 then exits case 10 through apertures 42 and opening 20 and moves into the surrounding air. When the user is finished with electronic device 34, it is switched off. Front 12 and back 14 are rotated about spine 16 back into abutting contact with each other. Flap 24 is moved to a closed position by rotating it about hinge 26 back into contact with exterior layer 14b and so that it covers opening 20. Securement members 48a, 48b are engaged to lock flap 24 in this closed position. Closure member 39 is then utilized to lock front 12 and back 14 together in the closed position. It will be understood that opening 20 preferably is of a sufficient size that is large enough to dissipate sufficient heat away from the electronic device 34 retained within case 10 to enable it to operate safely.
In accordance with a specific feature of the invention, case 110 defines two pairs of apertures 160 that extend through exterior layer 114b. A band 162 of heat conductive material extends through each pair of apertures 160 and into the interior of back 114. Preferably the band of heat conductive material is a metal band, most particularly a copper band. Although not illustrated herein it will be understood that a portion of each band 162 will be disposed adjacent the rear surface (equivalent of rear surface 34a) of electronic device 134. Heat generated by electronic device 134 will be transferred to that portion of the band 162 adjacent the electronic device and then through the band 162 to the region that is disposed outside of exterior layer 114b. The heat within the region of band 162 outside of exterior layer 114b will then dissipate into the air surrounding case.
The bands 162 may be provided instead of or in addition to heat dissipation assembly 52. If heat dissipation assembly 52 is not provided in case 114 and only bands 162 are present, cover 124 may still be moved into the open position as previously described and then air will flow through the opening (not numbered) and directly contact the rear surface of electronic device 134, This too will cause heat to be drawn away from electronic device 134. The inclusion of bands 162 is advantageous because the user can operate the electronic device on a flat surface with the flap 124 in a closed position but still have an effective means of removing heat generated by electronic device 134.
It will be understood that alternatively, the heat dissipation member 252 may be omitted from the case. In that instance heat from electronic device 234 will exit case 210 through apertures 270. To further enhance the loss of heat from case 210, flap 224 may be propped into an open position as described previously with respect to flap 24.
Although not illustrated herein, it will be understood that case may alternatively be free of front 12 and comprise only the back 14 having an opening 20 defined therein and a pocket 33 for receiving the electronic device, where the pocket retains a includes heat dissipation member 52 therein. The back 14 would protect the back and sides of the electronic device 34 but would leave screen 34a exposed. In this instance some type of retaining member would be needed to secure electronic device 34 within pocket 33 along fourth edge 30d. In this embodiment of the case, the heat dissipation member 44 retained within the back 14 would more efficiently remove heat from electronic device 34 than if the electronic device were not retained within the case. The reason for this is that metal conducts heat from one location to another far more efficiently than does air. Not only would this version of the case assist in heat reduction but the case would provide protection to the back and sides of the electronic article and thereby reduce the possibility that the device would be damaged by impact.
In the foregoing description, certain terms have been used for brevity, clearness, and understanding. No unnecessary limitations are to be implied therefrom beyond the requirement of the prior art because such terms are used for descriptive purposes and are intended to be broadly construed.
Moreover, the description and illustration of the invention are an example and the invention is not limited to the exact details shown or described.
This application claims priority from U.S. Provisional Application Ser. No. 61/666,285, filed Jun. 29, 2012, the disclosure of which is incorporated herein by reference.
Number | Date | Country | |
---|---|---|---|
61666285 | Jun 2012 | US |