ELECTROMAGNETIC RADIATION SHIELDING ON A PCI EXPRESS CARD
An example embodiment includes an electromagnetic radiation (EMR) shield. The EMR shield is configured to reduce EMR from escaping a host device. The EMR shield includes a structure, two or more module-grounding tabs, and multiple fingers. The structure is configured to substantially surround two or more adjacent transceiver modules positioned in an opening defined in a bezel. The two or more module-grounding tabs extend from the structure. Each of the module-grounding tabs is configured to contact one of the transceiver modules. The fingers extend from the structure and are configured to contact the bezel at multiple contact areas substantially surrounding the opening.
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This application claims priority to and the benefit of U.S. Provisional Patent Application Ser. No. 61/546,625, entitled “ELECTROMAGNETIC RADIATION SHIELDING AND MOUNTING FOR TRANSCEIVER MODULES ON A PCI EXPRESS CARD,” which was filed on Oct. 13, 2011, and which is incorporated herein by reference in its entirety.
BACKGROUND1. Field
Some embodiments described herein relate to electromagnetic radiation (EMR) shields for use in connection with optical transceiver modules.
2. Related Technology
Electronic modules, such as electronic or optoelectronic transceiver or transponder modules, are increasingly used in electronic and optoelectronic communication. Electronic modules typically communicate with a host device by transmitting electrical signals to the host device and receiving electrical signals from the host device. These electrical signals can then be transmitted by the electronic module outside the host device as optical and/or electrical signals.
One common difficulty associated with the operation of electronic modules is the generation of electromagnetic radiation (EMR). The generation of EMR during the operation of an electronic module is a matter of significant concern because such EMR can cause electromagnetic interference (EMI) with other systems and devices in the vicinity, which can seriously impair, if not prevent, the proper operation of those other systems and devices. Thus, the control of EMI effects is an important consideration in the design and use of electronic modules.
The subject matter claimed herein is not limited to embodiments that solve any disadvantages or that operate only in environments such as those described above. Rather, this background is only provided to illustrate one exemplary technology area where some embodiments described herein may be practiced.
SUMMARY OF SOME SAMPLE EMBODIMENTSThis 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 characteristics of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
An example embodiment includes an electromagnetic radiation (EMR) shield. The EMR shield is configured to reduce EMR escaping from a host device. The EMR shield includes a structure, two or more module-grounding tabs, and a plurality of fingers. The structure is configured to substantially surround two or more adjacent transceiver modules positioned in an opening defined in a bezel. The two or more module-grounding tabs extend from the structure. Each of the module-grounding tabs is configured to contact one of the transceiver modules. The fingers extend from the structure and are configured to contact the bezel at a plurality of contact areas substantially surrounding the opening.
Another example embodiment includes a peripheral component interconnect express (PCIe) card. The PCIe card includes a bezel, two or more adjacent transceiver modules, a printed circuit board (PCB), and an EMR shield. The bezel defines an opening. The two or more adjacent transceiver modules are positioned in the opening. The PCB is mechanically coupled to the bezel and to the transceiver modules. The EMR shield is configured to reduce EMR that escapes through the opening from a host device into which the PCIe card is received. The EMR shield includes a structure defining an enclosure configured to at least partially enclose the transceiver modules. The EMR shield further includes a plurality of fingers extending from the structure, which is configured to contact the bezel at a plurality of contact areas substantially surrounding the opening.
Another example embodiment includes a PCIe card. The PCIe card includes a bezel, two or more adjacent transceiver modules, a PCB, and an EMR shield. The bezel defines an opening. The two or more adjacent transceiver modules are positioned in the opening. The PCB is mechanically coupled to the bezel and to the transceiver module. The EMR shield is configured to reduce EMR that escapes through the opening from a host device into which the PCIe card is received. The EMR shield includes a structure that substantially surrounds the transceiver modules. The EMR shield further includes a plurality of ridges defined in the structure. The ridges are configured to contact the bezel at a plurality of contact areas substantially surrounding the opening.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The features and advantages of the invention may be realized and obtained by means of the instruments and combinations particularly pointed out in the appended claims. These and other features of the present invention will become more fully apparent from the following description and appended claims, or may be learned by the practice of the invention as set forth hereinafter.
To further clarify certain aspects of the present invention, a more particular description of the invention will be rendered by reference to example embodiments thereof which are disclosed in the appended drawings. It is appreciated that these drawings depict only example embodiments of the invention and are therefore not to be considered limiting of its scope. Aspects of the invention will be described and explained with additional specificity and detail through the use of the accompanying drawings in which:
Example embodiments of the invention relate to electromagnetic radiation (EMR) shields for use in connection with optical transceiver modules, such as those employed in a peripheral component interconnect express (PCIe) card. The EMR shields disclosed herein effectively maintain EMR emitted from a host device at acceptable levels to avoid electromagnetic interference (EMI) in surrounding devices.
Reference will now be made to the drawings to describe various aspects of example embodiments of the invention. It is to be understood that the drawings are diagrammatic and schematic representations of such example embodiments, and are not limiting of the present invention, nor are they necessarily drawn to scale.
Reference is first made to
The PCIe card 100 may be used in transmitting and receiving optical signals in connection with a host device (not shown) into which the PCIe card 100 is received. The PCIe card 100 includes one or more optoelectronic transceiver modules (modules) 104. The PCIe card 100 includes four modules 104; however, this is not meant to be limiting. In some embodiments, the PCIe card 100 may include three or fewer modules 104 or five or more modules 104.
The modules 104 may be mechanically coupled to a printed circuit board (PCB) 106 included in the PCIe card 100. With specific reference to
As best illustrated in
Referring back to all of
Each of the modules 104 may be configured for optical signal transmission and reception at a variety of per-second data rates including, but not limited to, 1 gigabit (G), 2 G, 2.5 G, 4 G, 8 G, 10 G, 10.7 G, or higher. The modules 104 may also be configured for optical signal transmission and reception at one or more wavelengths including, but not limited to, 850 nanometers (nm), 1310 nm, 1470 nm, 1490 nm, 1510 nm, 1530 nm, 1550 nm, 1570 nm, 1590 nm, or 1610 nm. Further, the modules 104 may be configured to support various transmission standards including, but not limited to, Optical Fast Ethernet, Optical G Ethernet, 10 G Ethernet, 40 G Ethernet, 100 G Ethernet, 1x, 2x, 4x, 8x, 10x, and 16x Fibre Channel, SONET OC-3, OC-12, OC-48, OC-192, OC-768, 10 Gigabit Fibre Channel, 10 G Ethernet, 100 BASE-T, and PON. Further, the modules 104 can be configured to operate properly with a case temperature range of −40° C. to 85° C. In addition, in some embodiments, the modules 104 may have a form factor that is substantially compliant with any of a variety of public standards such as the SFP+MSA, the SFF MSA, the SFP MSA, the CFP MSA, or the CXP MSA, or any proprietary standard. However, the modules 104 are not necessarily compliant with a standard and may be customized for a particular application. Each of the modules 104 depicted in
The modules 104 may include a top surface 122 (
The bezel 102 may also be mechanically coupled to the PCB 106. With specific reference to
The opening 110 (best illustrated in
To reduce the EMR escaping from the host device through the opening 110, the PCIe card 100 may include an EMR shield 200 (
Specifically, with combined reference to
As used herein with reference to the structure 202 and other structures described elsewhere herein, the term “surrounds” refers to a relationship between the modules 104 and the upper wall 218, the lower wall 222, and the two side walls 220A/220B. That is, the upper wall 218, the lower wall 222, and the two side walls 220A/220B create a band that borders and/or otherwise contacts the modules 104 along the top surface 122, the bottom surface 128, and the two side surfaces 124 without bordering or otherwise contacting the front of the modules 104 or a rear surface 126 of the modules 104. In contrast, as used herein with reference to the structure 202 and other structures described elsewhere herein, the term “enclosed” refers to a relationship between the enclosure 216 and the modules 104. That is, the enclosure 216 borders and/or otherwise contacts the modules 104 on the top surface 122, the bottom surface 128, the rear surface 126, and the two side surfaces 124.
The structure 202 may be generally constructed from an upper piece 204 and a lower piece 206. In
With combined reference to
Referring back to
The structure 202 also includes an outer edge 208. The outer edge may include an edge of the structure 202 opposite the rear wall 224. The outer edge 208 may be defined along the upper wall 218, the lower wall 222, and the two side walls 220A/220B. In the depicted embodiment, along the side walls 220A/220B, the outer edge 208 is defined along the upper piece 204 (i.e., the upper portions of the side walls 228A/228B), and the outer edge 208 may not be defined along the lower piece 206 (i.e., the lower portions of the side walls 226A/226B). Fingers 210 may extend from the outer edge 208. The fingers 210 may be configured to contact a bezel around an opening. For example, with combined reference to FIGS. 1C and 2A-2C, the fingers 210 may be configured to contact the bezel 102 around the opening 110. The fingers 210 that extend from the upper piece 204, that is, along a portion of the outer edge 208 defined along the upper wall 218 and the two side walls 220A/220B, may be curved. The fingers 210 that extend from the lower piece 206, that is, along a portion of the outer edge 208 defined along the lower wall 222, may additionally be curved.
In this and other embodiments, the fingers 210 may be substantially evenly spaced along the outer edge 208 and thus substantially evenly spaced around an opening contacted by the fingers 210. However, this is not meant to be limiting. In alternative embodiments, the fingers 210 may be unevenly spaced along the outer edge 208 and thus unevenly spaced around an opening contacted by the fingers 210.
Referring back to
Additionally,
As depicted in
Additionally, as depicted in
The EMR shield 500 may include a structure 502. The structure 502 refers to the portion of the second EMR shield 500 which is configured to substantially surround and/or at least partially enclose modules, such as the modules 104 of
The structure 502 may constitute an upper piece 526 and a lower piece 528. The upper piece 526 is substantially similar to and may correspond to the upper piece 204 of the structure 202 of
In
With combined reference to FIGS. 1C and 5A-5C, in these and other embodiments, the upper piece 526 may include connectors 522 used to secure the upper piece 526 to the PCB 106. The connectors 522 included on the upper piece 526 may extend from the rear wall 524 to be received in one or more of the pin openings 116 defined in the PCB 106. The connectors 522 may be soldered or otherwise secured to the PCB 106 to mechanically and/or electrically couple the upper piece 526 to the PCB 106.
Referring back to
A second type of module-grounding tab 518B may extend from the lower wall 508. Note only one of the second type of module-grounding tabs 518B is labeled in
The structure 502 also includes an outer edge 516 opposite the rear wall 524. The outer edge 516 is defined along the upper wall 504, the lower wall 508, and the two side walls 506A/506B. In the depicted embodiment, along the side walls 506A/506B, the outer edge 516 is defined along the upper piece 526 (i.e., the upper portions of the side walls 530A/530B) and not defined along the lower piece 528 (i.e., the lower portions of the side walls 532A/532B). Fingers 510 may extend from the outer edge 516. The fingers 510 may be configured to contact a bezel around an opening. For example, with combined reference to FIGS. 1C and 5A-5C, the fingers 510 may be configured to contact the bezel 102 around the opening 110. The fingers 510 that extend from the upper piece 526, that is, along a portion of the outer edge 516 defined along the upper wall 504 and the two side walls 506A/506B may be curved. However, each of the finger 510 that extends from a portion of the outer edge 516 defined along the lower wall 508 may be substantially straight. The fingers 510 may be substantially evenly spaced along the outer edge 516 and thus substantially evenly spaced around the opening.
Additionally,
In the sectional view, the different shapes of the fingers 510 are clearly visible. The fingers 510 that extend from the upper wall 504 are curved, which may produce a first contact area 602 where the fingers 510 that are curved contact the bezel 102. Additionally, the fingers 510 that extend from the lower wall 508, which are substantially straight, may produce a second contact area 610. The fingers 510 that are substantially straight may allow the bezel 102 to be positioned closer to the PCB 106, for instance.
With combined reference to
Referring back to
The structure 702 may also include module-grounding tabs 710. The module-grounding tabs 710 may extend from the upper wall 706. The module-grounding tabs 710 may contact a top surface of a module. For example, with combined reference to
The present invention may be embodied in other specific forms. The described embodiments are to be considered in all respects only as illustrative and not restrictive. The scope of the invention is, therefore, indicated by the appended claims rather than by the foregoing description. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims
1. An electromagnetic radiation (EMR) shield configured to reduce EMR from escaping a host device, the EMR shield comprising:
- a structure configured to substantially surround two or more adjacent transceiver modules positioned in an opening defined in a bezel;
- two or more module-grounding tabs extending from the structure and each configured to contact one of the transceiver modules; and
- a plurality of fingers extending from the structure and configured to contact the bezel at a plurality of contact areas substantially surrounding the opening.
2. The EMR shield of claim 1, wherein the structure comprises an upper wall configured to be positioned parallel to a top surface of the transceiver modules, a lower wall configured to be positioned parallel to a bottom surface of the transceiver modules, and two side walls configured to be positioned parallel to side surfaces of the transceiver modules.
3. The EMR shield of claim 2, wherein the structure further comprises a rear wall configured to be positioned parallel to a rear surface of the transceiver module.
4. The EMR shield of claim 3, wherein the structure comprises an outer edge opposite the rear wall and defined along the upper wall, the lower wall, and the two side walls, and the fingers extend from the outer edge.
5. The EMR shield of claim 4, wherein each finger that extends from a portion of the outer edge defined along the upper wall and the two side walls is curved.
6. The EMR shield of claim 5, wherein each finger that extends from a portion of the outer edge defined along the lower wall is substantially straight.
7. The EMR shield of claim 6, wherein the rear wall comprises one or more connectors configured to be coupled to a printed circuit board (PCB) and the lower wall comprises one or more connectors configured to be coupled to the PCB.
8. The EMR shield of claim 1, wherein the structure comprises a first portion configured to be positioned inside the opening and a second portion configured to be positioned outside the opening, the first portion and the second portion being connected by the fingers, each finger configured to contact an edge of the opening.
9. The EMR shield of claim 1, wherein the structure further comprises one or more vertical slats each configured to be positioned between adjacent transceiver modules of the transceiver modules.
10. A peripheral component interconnect express (PCIe) card comprising the EMR shield of claim 1.
11. A peripheral component interconnect express (PCIe) card comprising:
- a bezel defining an opening;
- two or more adjacent transceiver modules positioned in the opening;
- a printed circuit board (PCB) mechanically coupled to the bezel and to the transceiver modules; and
- an electromagnetic radiation (EMR) shield configured to reduce EMR that escapes through the opening from a host device into which the PCIe card is received, the EMR shield including a structure defining an enclosure configured to at least partially enclose the transceiver modules, the EMR shield further including a plurality of fingers extending from the structure and configured to contact the bezel at a plurality of contact areas substantially surrounding the opening.
12. The PCIe card of claim 11, wherein:
- the structure comprises an upper piece configured to at least partially enclose a top surface of the transceiver modules, a rear surface of the transceiver modules, and two side surfaces of the transceiver modules;
- the upper piece includes an outer edge; and
- each of the fingers that extends from the outer edge of the upper piece is curved.
13. The PCIe card of claim 12, wherein the upper piece comprises one or more upper piece connectors configured to be coupled to the PCB.
14. The PCIe card of claim 12, wherein:
- the structure comprises a lower piece positioned between the transceiver modules and the PCB;
- the lower piece including an outer edge;
- each of the fingers that extends from the outer edge of the lower piece is substantially straight.
15. The PCIe card of claim 12, wherein:
- the structure comprises a lower piece positioned between the transceiver modules and the PCB;
- the lower piece including an outer edge;
- each of the fingers that extends from the outer edge of the lower piece is curved.
16. The PCIe card of claim 11, wherein the plurality of fingers is substantially evenly spaced around the opening.
17. The PCIe card of claim 11, wherein the structure substantially surrounds the transceiver modules.
18. A peripheral component interconnect express (PCIe) card comprising:
- a bezel defining an opening;
- two or more adjacent transceiver modules positioned in the opening;
- a printed circuit board (PCB) mechanically coupled to the bezel and to the transceiver module; and
- an electromagnetic radiation (EMR) shield configured to reduce EMR that escapes through the opening from a host device into which the PCIe card is received, the EMR shield including a structure substantially surrounding the transceiver modules, the EMR shield further including a plurality of ridges defined in the structure, the plurality of ridges configured to contact the bezel at a plurality of contact areas substantially surrounding the opening.
19. The PCIe card of claim 18, wherein:
- the structure comprises a front wall defining two or more module openings in each of which one of the transceiver modules is positioned, an upper wall, a lower wall, and two side walls;
- the upper wall, the lower wall, and the two side walls are substantially perpendicular to the front wall;
- each of the upper wall, the lower wall, and the two side walls includes two or more of the ridges; and
- each ridge includes a raised portion configured to contact an edge of the opening.
20. The PCI card of claim 18, wherein the ridges are substantially evenly spaced around the opening.
Type: Application
Filed: Oct 12, 2012
Publication Date: Apr 18, 2013
Applicant: FINISAR CORPORATION (Sunnyvale, CA)
Inventor: FINISAR CORPORATION (Sunnyvale, CA)
Application Number: 13/651,245
International Classification: H05K 9/00 (20060101); H05K 5/02 (20060101);