Patent Publication Number: US-11032954-B2

Title: Shield can

Description:
RELATED APPLICATIONS 
     This application is a continuation of and claims priority under 35 U.S.C. § 120 to U.S. patent application Ser. No. 15/357,890, filed on Nov. 21, 2016, entitled “Shield Can”, which is a divisional of and claims priority under 35 U.S.C. § 120 to U.S. Patent application Ser. No. 14/033,320, filed on Sep. 20, 2013, entitled “Shield Can”, and U.S. Provisional Patent Application No. 61/759,962, filed Feb. 1, 2013, entitled “Battery Connections, Clip Shields, Housing and PCBs, and Shield Cans”, the disclosures of each of which are incorporated by reference in their entirety. 
    
    
     BACKGROUND 
     Designs for computing devices are ever changing. However, these designs are often limited by hardware components which enable device functionality. For example, hardware components affect certain aspects of a design, such as size, structure, and/or robustness. 
     In one example, a device may include one or more components that require electromagnetic shielding to prevent interference with other components of the device. As these devices become thinner, the internal components of the devices continue to require electromagnetic shielding. However, typical shielding solutions for electronic devices may limit the internal and/or external structure of the electronic devices because of current manufacturing techniques. 
     SUMMARY 
     A shield can is described. In one or more implementations, a shield can includes a frame configured to be installed on a printed circuit board (PCB). The shield can also includes a lid configured to be connected to the frame after installation of the frame to form the shield can over one or more components that are installed on the PCB. 
     In one or more implementations, a computing device includes one or more components configured to produce an electromagnetic field. The computing device also includes a shield can configured to provide an electromagnetic shield for the one or more components. The shield can includes a lid connected to a frame that is installed on a PCB. 
     In one or more implementations, a method includes connecting a frame to a PCB. In addition, one or more flexible printed circuits (FPCs) are installed on the PCB. Further, a lid is connected to the frame to form a shield can over the one or more FPCs. 
     This Summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This Summary is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       The detailed description is described with reference to the accompanying figures. In the figures, the left-most digit(s) of a reference number identifies the figure in which the reference number first appears. The use of the same reference numbers in different instances in the description and the figures may indicate similar or identical items. Entities represented in the figures may be indicative of one or more entities and thus reference may be made interchangeably to single or plural forms of the entities in the discussion. 
         FIG. 1  is an illustration of an environment in an example implementation that is operable to employ a device utilizing the shield can techniques described herein. 
         FIG. 2  depicts an isometric view of an example two-part shield can assembly. 
         FIG. 3  depicts a cross-sectional view of the frame showing a cross-bar shape. 
         FIG. 4  depicts an isometric view of an example frame of the shield can assembly in  FIG. 2  with a cross-bar and without the cross-bar. 
         FIG. 5  depicts an isometric view of a shield can as installed on a printed circuit board. 
         FIG. 6 a    depicts a cross-sectional view of a shield can assembly showing relative positions of a shielded component and the shield can assembly. 
         FIG. 6 b    depicts an illustration of an example connecting component of the lid from  FIG. 6 a    in greater detail. 
         FIG. 6 c    depicts an illustration of an example connecting component of the frame from  FIG. 6 a    in greater detail. 
         FIG. 7  depicts an example shield can assembly showing relative positions of a shielded component and the shield can assembly. 
         FIG. 8  depicts a cross-sectional view of the shield can assembly and shielded component. 
         FIG. 9  depicts an illustration of an isometric view of an example shield can assembly. 
         FIG. 10  depicts an illustration of an isometric view of an example shield can assembly. 
         FIG. 11  depicts a flow diagram of an example shield can assembly process. 
         FIG. 12  depicts an example system that includes an example computing device that may implement and/or include the various shield can assembly techniques. 
         FIG. 13  depicts an illustrations of an isometric view of an example shield clip. 
         FIG. 14  depicts an illustration of a side view of an example assembly of two clips installed onto a PCB with optional riser plates. 
         FIG. 15  depicts an illustration of a side view of an example shield clip with a representative shield can sidewall. 
         FIG. 16  depicts an illustration of a top view of an example shield clip. 
     
    
    
     DETAILED DESCRIPTION 
     Overview 
     Conventional techniques that were used to construct electromagnetic shielding of electronic components of computing devices may limit certain aspects of the computing devices, such as size and/or mechanical robustness, at least by affecting the computing device&#39;s internal and/or external structure. For example, previous typical solutions required an increase in height in order to avoid interference between the shielding can and the components to be shielded. 
     Accordingly, techniques are described herein in which a two-piece electromagnetic shielding can achieves a low height with respect to typical shielding solutions which are soldered to a PCB. A lowest-profile design may be used to minimize overall thickness of the computing device, such as a hand-held personal computing device or tablet. The shielding design may be Pick and Place compatible, as well as Surface Mount Technology (SMT) compatible. In addition, the shielding design may include a non-conductive inner surface to avoid electrically shorting shielded electronic components, and a removable lid in order to allow for rework and/or process/manufacturing troubleshooting. Further discussion of this and other examples may be found in the following section. 
     In the following discussion, an example environment is first described that may employ the techniques described herein. Following this, example device components are described which may be used to employ the techniques described herein. Example procedures are then described which may be performed in the example environment as well as other environments. Consequently, performance of the example procedures is not limited to the example environment and the example environment is not limited to performance of the example procedures. 
     Example Environment 
       FIG. 1  is an illustration of an environment  100  in an example implementation that is operable to employ techniques described herein. The illustrated environment  100  includes a computing device  102 . The computing device  102  may be configured in a variety of ways. For example, the computing device  102  may include a housing  104  that is configured for mobile use (e.g., handheld), such as in a slate configuration. Examples of slate configurations may be found in mobile phones, a tablet computer as illustrated, portable game devices, music players, and so on. The housing  104  may be formed in a variety of ways, such as through injection of a metal alloy such as a magnesium alloy. Thus, the computing device  102  may range from full resource devices with substantial memory and processor resources to a low-resource device with limited memory and/or processing resources. 
     In this example, the computing device  102  is illustrated as being grasped in the hands  106 ,  108  of a user. Thus, as illustrated, the thumbs of the user&#39;s hands  106 ,  108  are positioned to interact with a front surface of the input device and computing device  102  that includes one or more computing components  110  which may be configured to perform and/or assist in performance of one or more operations of the computing device  102 , e.g., in execution of instructions specified by software. Examples of computing components  110  include a processing system  112 , memory  114 , and shield can  116  with examples of software that include an operating system  118  and applications  120 . 
     The computing device  102  may be configured in a variety of ways. For example, a computing device may be configured as a computer that is capable of communicating over a network, such as a desktop computer, a mobile station, an entertainment appliance, a set-top box communicatively coupled to a display device, a wireless phone, a game console, educational interactive devices, point of sales devices, and so forth. Thus, the computing device  102  may range from full resource devices with substantial memory and processor resources (e.g., personal computers, game consoles) to a low-resource device with limited memory and/or processing resources (e.g., traditional set-top boxes, hand-held game consoles). Additionally, although a single computing device  102  is shown, the computing device  102  may be representative of a plurality of different devices, such as multiple servers utilized by a business to perform operations such as by a web service, a remote control and set-top box combination, an image capture device and a game console configured to capture gestures, and so on. In addition, it may apply to apparatuses including a plurality of display devices, e.g., a clam shell configuration. 
     The computing device  102  may support a variety of different interactions. For example, the computing device  102  may include one or more hardware devices that are configured to be manipulated by a user to interact with the device, such as a keyboard, cursor control device (e.g., mouse), and so on. The computing device  102  may also support gestures, which may be detected in a variety of ways. The computing device  102 , for instance, may support touch gestures that are detected using touchscreen functionality of the computing device  102 . 
     The shield can  116  is representative of a shield can assembly that may be configured to provide electromagnetic shielding of electronic components, such as a flexible printed circuit (FPC). For instance, electronic components may emit an electromagnetic field, such as radio frequency (RF) electromagnetic radiation, radio waves, and/or electrostatic fields. These emissions can interfere with the performance of sensitive wireless receivers. The shield can  116  may be configured to reduce electromagnetic interference (EMI) caused by the electronic components by providing an enclosure made of conductive and/or magnetic materials. In this way, the shield can  116  may block the electromagnetic field produced by a particular electronic component from leaving the enclosure, and also block other electromagnetic fields from entering the enclosure. 
     A display device  122  integrated with the computing device  102  may include touchscreen functionality that is configured to detect proximity of an object (e.g., one or more fingers of the user&#39;s hands  106 ,  108 ) to interact with a user interface displayed by the display device  122 . Further discussion of functionality of the computing device may be found below in a corresponding section. 
     Example Device 
       FIG. 2  depicts an isometric view of an example two-part shield can assembly  200 . This shield can assembly  200  illustrates a lid  202  that is configured to connect to a frame  204  to provide an enclosure. The frame  204  may be formed from any of a variety of materials. For example, the frame  204  may be formed from sheet metal, or any other conductive and/or magnetic material. In addition, the frame  204  may be configured to be soldered to a PCB. In an embodiment, the frame  204  may include a cross-bar  206  that enables flatness tolerances of ±0.05 millimeters for the overall flatness of the frame  204  and also provides a means for a Pick and Place machine suction tip to pick the part for placement on the PCB. 
       FIG. 3  depicts a cross-sectional view, generally at  300 , of the frame showing the cross-bar shape. In an embodiment, the cross-bar  206  may be bent up to be raised above a flange of the frame  204  in order to avoid interference with the components  302  to be shielded. For example, if the component height were 1.2 mm and the frame height were 1.35 mm, with a thickness of the cross-bar  206  of 0.15 mm, then the lower surface of the cross-bar  206  (e.g., the side facing the PCB  304 ) would interfere with the component  302  and result in an unusable component  302  or frame  204 . 
     The frame  204  and components  302  may be soldered to the PCB  304 , such as via SMT solder reflow. The PCB  304  may be configured to mechanically support and electrically connect the electronic components using conductive tracks, pads, and other features etched from a conductive material, such as copper sheets, laminated onto a non-conductive substrate. In some embodiments, the PCB  304  may include one or more components embedded in the substrate, such as capacitors, resistors, and/or active devices. 
     Once the frame  204  is secured to the PCB  304 , the cross-bar  206  may be removed from the frame  204 . In at least some embodiments, the cross-bar  206  may be removed via twisting or snipping. For example,  FIG. 4  depicts an isometric view, generally at  400 , of an example frame of the shield can assembly with a cross-bar and without the cross-bar. In the upper drawing, the frame  204  is illustrated as having the cross-bar  206  attached. Once the cross-bar  206  is removed, the frame  204  becomes frame  402 , as illustrated in the lower drawing. 
     After the cross-bar is removed, other components may be inserted within the frame and installed on the PCB. For example, an FPC may be soldered onto the PCB. In some embodiments, the FPC may be installed prior to installation of the frame. Once all the desired components are installed within the frame  204  and the cross-bar  206  is removed, then the lid  202  from  FIG. 2  may be placed over top of the frame  402  to create the shield can assembly. 
       FIG. 5  depicts an isometric view, generally at  500 , of a shield can as installed on a PCB. The lid  202  may include holes to ensure that any burr left behind by the cross-bar does not prevent the lid from fully seating. In at least one embodiment, the lid  202  includes two holes, one for each connection point of the cross-bar  206  to the frame  204 . In an embodiment, the lid may include additional holes, such as the four holes illustrated in  FIG. 5 , for fabrication purposes. In order to adequately shield an electromagnetic field, the holes in the lid  202  may be smaller than the smallest amplitude or highest frequency wave that is being shielded. Additionally, with mobile computing device designs becoming ever thinner, the shield can assembly may have a low profile. For example, the shielding can assembly can have a total height between the range of approximately 0.8 mm to 1.5 mm, with shielded components that are less than 1.2 mm tall. 
     Consider now  FIG. 6 a   , which depicts a cross-sectional view of an example system  600  that includes a shield can assembly showing relative positions of a shielded component and the shield can assembly. For example, at the base of the assembly is the PCB  304 . In some embodiments, an adhesive  602 , such as solder paste, is attached to a surface of the PCB  304 . Using the adhesive  602 , a component  302  and the frame  204  are installed onto the PCB  304 . As previously described, the component  302  may be placed first onto the PCB  304  followed by installation of the frame  402 , or the frame  402  may be placed first onto the PCB  304  followed by installation of the component  302 . In addition, an adhesive  604 , such as pressure sensitive adhesive (PSA), can be adhered to the upper surface of the component (e.g., away from the PCB  304 ) and adhered to the bottom surface of the lid  202  when the lid  202  is installed. 
     In one or more embodiments, the lid  202  may be adhered to the frame  204  using a PSA. Alternatively or in addition, the lid  202  may latch to the frame  204  using a mechanical latch, such as a “bump and lip” configuration. For example, consider  FIGS. 6 b  and 6 c   .  FIG. 6 b    depicts an illustration of an example connecting component of the lid from  FIG. 6 a    in greater detail. In an embodiment, the connecting component of the lid  202  may include a lip  606  and an indentation or hole  608  that is configured to receive a bump or protrusion disposed on a connecting component of the frame  204 . An example connecting component of the frame  204  is illustrated in  FIG. 6 c   . In at least one embodiment, the frame  204  may include a protrusion  610  or “bump” disposed on an edge of the frame  204  such that the protrusion  610  is configured to extend outward from the edge of the frame  204  on a side of the frame  204 , or on top of the frame  204 , or both. 
     When the lid  202  is placed onto the frame  204 , the lip  606  engages the protrusion  610 . With sufficient force, the lip  606  of the lid  202  can be pushed passed the protrusion  610  on the frame until the protrusion  610  engages the indentation or hole  608 . It should be readily apparent to a person of ordinary skill in the art that this design may be reversed (e.g., the indentation or hold may be arranged on the frame and the protrusion may be arranged on the lid), combined, and so on. 
     Consider now  FIG. 7 , which depicts an example shield can assembly, generally at  700 , showing relative positions of a shielded component and the shield can assembly. A variety of configurations of positions of the various components can be used to construct the shield can. The examples described herein are not exhaustive and the configurations of relative positioning of the components is not limited to the description herein. Any combination of the different layers described in  FIG. 7  can be used. 
     In the example shown in  FIG. 7 , a PCB  702  may include solder pads upon which solder paste  704  may be applied. One or more components  706  may be placed onto the solder paste  704 , such as by a Pick and Place machine or other SMT technology. Then, conductive PSA or conductive foam  708  is adhered to the top surface of the components  706  and the bottom surface of the FPC  710 . Alternatively, the FPC  710  may be placed directly onto the solder paste  704  without the component  706  being installed. Once the FPC  710  is placed onto the PSA or foam  708 , additional conductive PSA or conductive foam  712  may be adhered to the top surface of the FPC  710 . At least a portion of the lid  714 , such as a flange of the lid  714 , may be placed onto the additional conductive PSA or conductive foam  712 . In some embodiments, further additional conductive foam  716  may be placed on the top surface of the lid  714 . It should be readily apparent that various combinations of the above-described layers are contemplated. 
     For instance, in one embodiment, conductive foam can be adhered to both the top and bottom surfaces of a flange of the lid  714 , with conductive PSA adhering the FPC  710  to a shield fence flange, such as a flange of the frame. In an alternative embodiment, conductive PSA may adhere the flange of the lid  714  to the FPC, and conductive foam may be adhered to the bottom surface of the FPC  710  and to the solder paste  704 . In another embodiment, conductive PSA may adhere the flange of the lid  714  to the FPC, and additional PSA may adhere the FPC to the shield fence flange. A shield can may also be configured to permit an FPC  710  to exit the shield can through a gap in the shield can frame. The portion of FPC  710  that is outside of the shield can frame may also be enclosed by conductive foam or other conductive material to maintain RF shielding in a very narrow space. In this manner, an FPC may be entirely enclosed by a conductive material such that signals carried on the FPC may not cause electromagnetic interference (EMI) to interfere with other signals or circuits. The conductive material surrounding the FPC may also prevent EMI generated by other signals or circuits from interfering with the signals carried by the FPC. 
       FIG. 8  depicts a cross-sectional view, generally at  800 , of the shield can assembly and shielded component. In this example, the lid  202  is disposed over the component  302  to be shielded. In addition, the lid  202  is secured to the frame  204 . Thus, the lid  202  provides an enclosure configured to block electromagnetic fields, such as RF fields, from entering or leaving the enclosure. 
       FIG. 9  depicts an illustration of an isometric view of an example shield can assembly  900 . In this example, the shield can assembly  900  includes an adhesive  902 , an insulator  904 , conductive foam  906 ,  908  and a lid  202 . The lid may include multiple dimples disposed along a perimeter of the lid to create an EMI shield. The adhesive  902  is configured to adhere the lid  202  to the frame. As illustrated in  FIG. 9 , the adhesive  902  may be formed to adhere to the bottom surface of the lid  202  along one or more edges of the lid  202 . Although a rectangular shape is illustrated for the lid  202 , any suitable shape may be used. In addition, the lid  202  may include one or more flanges  910  that are configured to interface with the conductive foam  906 ,  908 . The flanges  910  may also be usable in removing the lid  202  after installation to allow for rework and/or process/manufacturing troubleshooting. 
       FIG. 10  depicts an illustration of an isometric view of an additional example shield can assembly  1000 . In this example, the shield can assembly  1000  includes an insulator  904 , conductive foam  906 ,  908 , and a lid  202 . The lid  202  may include one or more lips  912  with holes that are configured to engage protrusions disposed on the frame, to create a mechanical latch to secure the lid  202  to the frame. The lips  912  may include flanges bent downward to interface with one or more edges of the frame. Alternatively, the lips  912  may each include a protrusion configured to engage an indentation or hole disposed on the frame to create a mechanical latch to secure the lid  202  to the frame. Further still, a combination of the protrusions and holes may be included on the lid  202  and frame. 
     Example Procedures 
     The following discussion describes shield can techniques that may be implemented utilizing the previously described systems and devices. Aspects of each of the procedures may be implemented in hardware, firmware, or software, or a combination thereof. The procedures are shown as a set of blocks that specify operations performed by one or more devices and are not necessarily limited to the orders shown for performing the operations by the respective blocks. In portions of the following discussion, reference will be made to the environment  100  of  FIG. 1 , and various elements of  FIGS. 2-10 . 
       FIG. 11  depicts a flow diagram of an example assembly of a shield can. A cross-bar connected to a frame is used to place the frame onto a PCB (block  1102 ). For example, the cross-bar may be used by a Pick and Place machine suction tip to pick the part (e.g., frame) for placement on the PCB. The frame is connected to the PCB (block  1104 ). This step can be performed in any suitable way. For example, the frame may be soldered to the PCB, such via an SMT process. 
     Once the frame is connected to the PCB, the cross-bar is removed from the frame (block  1106 ). For example, the cross-bar may be removed by twisting or snipping. Other techniques to remove the cross-bar from the frame are also contemplated. Once the cross-bar is removed, one or more flexible printed circuits (FPCs) may be installed on the PCB (block  1108 ). 
     Subsequent to the installation of the frame and the components, a lid may be connected to the frame to form an enclosure over the components (block  1110 ). For example, the lid may be configured to block electromagnetic fields generated by the component or by another nearby component, such that the lid blocks electromagnetic fields from entering and/or leaving the enclosure. As described above, the lid may be connected and secured to the frame via adhesive, such as conductive PSA, and/or via a mechanical latch, such as with a “bump and lip” configuration. 
     Example Device 
       FIG. 12  illustrates an example system generally at  1200  that includes an example computing device  1202  that is representative of one or more computing systems and/or devices that may implement the various techniques described herein. The computing device  1202  may be, for example, be configured to assume a hand held configuration through use of a housing formed and size to be grasped and carried by one or more hands of a user, illustrated examples of which include a mobile phone, mobile game and media device, and tablet computer although other examples are also contemplated. 
     The example computing device  1202  as illustrated includes a processing system  1204 , one or more computer-readable media  1206  (e.g., non-transitory forms of media that do not include signals per se), and one or more I/O interface  1208  that are communicatively coupled, one to another. Although not shown, the computing device  1202  may further include a system bus or other data and command transfer system that couples the various components, one to another. A system bus can include any one or combination of different bus structures, such as a memory bus or memory controller, a peripheral bus, a universal serial bus, and/or a processor or local bus that utilizes any of a variety of bus architectures. A variety of other examples are also contemplated, such as control and data lines. 
     The processing system  1204  is representative of functionality to perform one or more operations using hardware. Accordingly, the processing system  1204  is illustrated as including hardware element  1210  that may be configured as processors, functional blocks, and so forth. This may include implementation in hardware as an application specific integrated circuit or other logic device formed using one or more semiconductors. The hardware elements  1210  are not limited by the materials from which they are formed or the processing mechanisms employed therein. For example, processors may be comprised of semiconductor(s) and/or transistors (e.g., electronic integrated circuits (ICs)). In such a context, processor-executable instructions may be electronically-executable instructions. 
     The computer-readable storage media  1206  is illustrated as including memory/storage  1212 . The memory/storage  1212  represents memory/storage capacity associated with one or more computer-readable media. The memory/storage component  1212  may include volatile media (such as random access memory (RAM)) and/or nonvolatile media (such as read only memory (ROM), Flash memory, optical disks, magnetic disks, and so forth). The memory/storage component  1212  may include fixed media (e.g., RAM, ROM, a fixed hard drive, and so on) as well as removable media (e.g., Flash memory, a removable hard drive, an optical disc, and so forth). The computer-readable media  1206  may be configured in a variety of other ways as further described below. 
     Input/output interface(s)  1208  are representative of functionality to allow a user to enter commands and information to computing device  1202 , and also allow information to be presented to the user and/or other components or devices using various input/output devices. Examples of input devices include a keyboard, a cursor control device (e.g., a mouse), a microphone, a scanner, touch functionality (e.g., capacitive or other sensors that are configured to detect physical touch), a camera (e.g., which may employ visible or non-visible wavelengths such as infrared frequencies to recognize movement as gestures that do not involve touch), and so forth. Examples of output devices include a display device (e.g., a monitor or projector), speakers, a printer, a network card, tactile-response device, and so forth. Thus, the computing device  1202  may be configured in a variety of ways to support user interaction. 
     The computing device  1202  is further illustrated as being communicatively and physically coupled to an input device  1214  that is physically and communicatively removable from the computing device  1202 . In this way, a variety of different input devices may be coupled to the computing device  1202  having a wide variety of configurations to support a wide variety of functionality. In this example, the input device  1214  includes one or more keys  1216 , which may be configured as pressure sensitive keys, mechanically switched keys, and so forth. 
     The input device  1214  is further illustrated as include one or more modules  1218  that may be configured to support a variety of functionality. The one or more modules  1218 , for instance, may be configured to process analog and/or digital signals received from the keys  1216  to determine whether a keystroke was intended, determine whether an input is indicative of resting pressure, support authentication of the input device  1214  for operation with the computing device  1202 , and so on. 
     Various techniques may be described herein in the general context of software, hardware elements, or program modules. Generally, such modules include routines, programs, objects, elements, components, data structures, and so forth that perform particular tasks or implement particular abstract data types. The terms “module,” “functionality,” and “component” as used herein generally represent software, firmware, hardware, or a combination thereof. The features of the techniques described herein are platform-independent, meaning that the techniques may be implemented on a variety of commercial computing platforms having a variety of processors. 
     An implementation of the described modules and techniques may be stored on or transmitted across some form of computer-readable media. The computer-readable media may include a variety of media that may be accessed by the computing device  1202 . By way of example, and not limitation, computer-readable media may include “computer-readable storage media” and “computer-readable signal media.” 
     “Computer-readable storage media” may refer to media and/or devices that enable persistent and/or non-transitory storage of information in contrast to mere signal transmission, carrier waves, or signals per se. Thus, computer-readable storage media refers to non-signal bearing media. The computer-readable storage media includes hardware such as volatile and non-volatile, removable and non-removable media and/or storage devices implemented in a method or technology suitable for storage of information such as computer readable instructions, data structures, program modules, logic elements/circuits, or other data. Examples of computer-readable storage media may include, but are not limited to, RAM, ROM, EEPROM, flash memory or other memory technology, CD-ROM, digital versatile disks (DVD) or other optical storage, hard disks, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or other storage device, tangible media, or article of manufacture suitable to store the desired information and which may be accessed by a computer. 
     “Computer-readable signal media” may refer to a signal-bearing medium that is configured to transmit instructions to the hardware of the computing device  1202 , such as via a network. Signal media typically may embody computer readable instructions, data structures, program modules, or other data in a modulated data signal, such as carrier waves, data signals, or other transport mechanism. Signal media also include any information delivery media. The term “modulated data signal” means a signal that has one or more of its characteristics set or changed in such a manner as to encode information in the signal. By way of example, and not limitation, communication media include wired media such as a wired network or direct-wired connection, and wireless media such as acoustic, RF, infrared, and other wireless media. 
     As previously described, hardware elements  1210  and computer-readable media  1206  are representative of modules, programmable device logic and/or fixed device logic implemented in a hardware form that may be employed in some embodiments to implement at least some aspects of the techniques described herein, such as to perform one or more instructions. Hardware may include components of an integrated circuit or on-chip system, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), a complex programmable logic device (CPLD), and other implementations in silicon or other hardware. In this context, hardware may operate as a processing device that performs program tasks defined by instructions and/or logic embodied by the hardware as well as a hardware utilized to store instructions for execution, e.g., the computer-readable storage media described previously. 
     Combinations of the foregoing may also be employed to implement various techniques described herein. Accordingly, software, hardware, or executable modules may be implemented as one or more instructions and/or logic embodied on some form of computer-readable storage media and/or by one or more hardware elements  1210 . The computing device  1202  may be configured to implement particular instructions and/or functions corresponding to the software and/or hardware modules. Accordingly, implementation of a module that is executable by the computing device  1202  as software may be achieved at least partially in hardware, e.g., through use of computer-readable storage media and/or hardware elements  1210  of the processing system  1204 . The instructions and/or functions may be executable/operable by one or more articles of manufacture (for example, one or more computing devices  1202  and/or processing systems  1204 ) to implement techniques, modules, and examples described herein. 
     Clip Shield 
     In order to electromagnetically shield certain large areas of a PCB using conventional sheet-metal shielding, the shield cans are limited to a certain size in order to allow for standard high-production PCB assembly (SMT process). This is due to the lack of flatness inherent in PCBs over areas generally larger than 50 by 50 mm Above this area [and aspect ratio], the flatness is such that the height of the solder paste may be less than the flatness of the PCB, resulting in segment(s) of the shielding can that would not be electrically connected to the PCB. 
     By using discreet clips, which are directly soldered to the PCB via standard high-production pick and place machine and SMT process, and by pressing a single large shielding can into said clips, a continuous electrical connection can be achieved around the perimeter of the area intended to be shielded. Furthermore, when using a larger shielding can, the number of clips involved in creating an electrically continuous perimeter scales with the length of the perimeter and the force required to press the shielding can into the clips [and thus attach the can to the PCB] also becomes large. 
       FIG. 13  depicts an illustration of an isometric view  1300  of an example shield clip. The shield clip  1302  includes a solder side that can be soldered to directly to the PCB or to an optional riser plate. Additionally, the shield clip  1302  can include one or more domes, which are discussed in further detail below. The shield clip  1302  also includes a Pick and Place pick point to enable a pick and place machine to grasp the shield clip  1302 . 
       FIG. 14  depicts an illustration of a side view of an example shield clip assembly  1400 . The shield clip assembly  1400  includes two clips  1402  installed onto a PCB  1404  with an optional riser piece  1406 . This view shows a maximum recommended gap between electrical contact points of 2.5 mm in order to effectively shield electromagnetic waves with an amplitude of 2.5 mm or greater.  FIG. 14  includes various dimensions that may be used for each component of the assembly. However, the dimensions shown are merely examples and the shield clip assembly is not limited to the example dimensions shown. 
     The clip design reduces this force in order to avoid damaging the can  1408  during installation. Additionally, the clip  1402  can be manufactured with a riser piece  1406  attached to the solder side of the clip which acts to raise the clip  1402  off of the PCB  1404  surface in the event that this is desirable, such as in the case where under fill glue/epoxy will be used in the vicinity of the shield can perimeter, and a traditional surface-mount clip would have its base covered with the flow of glue/epoxy such that the shielding can  1408  would not be able to fully seat into the clip  1402 , leading to possible interferences with other internal Device components. 
       FIG. 15  depicts a side view of an example shield clip with a representative shield can sidewall, showing how the interference and frictional attachment can be achieved when manually joining the shield can to the clip (and to the PCB). The dimensions shown in  FIG. 15  are negotiable depending on the specific design requirements. 
     The clip design enables a reduction in shield can  1408  insertion force. An embodiment of the design protects the function of the clip  1402  against underfill glue/epoxy that is commonly used to hold down larger PCB components, such as the CPU or PCH. 
     The low-insertion force clip differs from a traditional clip in two ways: a raised dome protrudes out from the clip surface to change the friction contact from a line to a point; and the locations of the domes on the clip  1402  are such that the effective gap between domes when placed on the PCB is 2.5 mm or less. This may be used to reduce emissions from such components as a CPU or PCH processor chip, where shielding for Wifi or telecommunications. An optional riser plate can be laser welded to the clip  1402  to protect against contamination from epoxy or glue dispensed onto the PCB as part of the manufacturing process. 
     The clip may be made using a sheet metal forming processes. The metal has a solderable plating and an area large enough for suction placement which allows it to be placed on the PCB using a pick and place machine and it is compatible with the industry standard SMT process. The optional riser plate is also a plated [or otherwise solderable] metal which is laser welded [or otherwise affixed] to the clip. 
       FIG. 16  depicts an illustration of a top view  1600  of an example shield clip, along with various example dimensions. The shield clip includes a pick up area for a Pick and Place machine. The shield clip may be configured for a Pick and Place machine having a 1 mm diameter nozzle. Any of a variety of sizes for the pick up area may be utilized. 
     Conclusion 
     Although the invention has been described in language specific to structural features and/or methodological acts, it is to be understood that the invention defined in the appended claims is not necessarily limited to the specific features or acts described. Rather, the specific features and acts are disclosed as example forms of implementing the claimed invention.