This invention relates to electrical connectors, and particularly to high-speed electrical connectors for attachment to printed circuit boards.
Electrical conductors carrying high-frequency signals and currents are subject to interference and cross-talk when placed in close proximity to other conductors carrying high-frequency signals and currents. The interference and cross-talk can result in degradation of the signal and errors in signal reception. Coaxial and shielded cables are available to carry signals from a transmission point to a reception point, and reduce the likelihood that the signal carried in one shielded or coaxial cable will interfere with the signal carried by another shielded or coaxial cable in close proximity. However, at points of connection, the conductor shielding is often lost. The loss of shielding allows interference and crosstalk between signals near the points of connection. The use of individual shielded wires and cables is not desirable at points of connection due to the need for making a large number of connections in a very small space. In these circumstances, two-part high-speed backplane electrical connectors containing multiple shielded conductive paths are used. For example, specification IEC 1076-4-101 from the International Electrotechnical Commission sets out parameters for 2 mm, two-part connectors for use with printed circuit boards.
As users modify and upgrade systems to achieve improved performance, problems continue to arise. In particular, with many high-frequency systems, even a small unshielded portion of an electrical conductor causes a discontinuity in the impedance of the conductor, and allows performance damaging interference and cross-talk to occur. A connector system that provides improved shielding and impedance control is desirable.
One aspect of the invention described herein provides a connector system. In one embodiment according to the invention, the connector system includes a circuit board having a plurality of holes extending from a first side of the circuit board to a second side of the circuit board. A first connector body having a front wall is positioned on the first side of the circuit board, and the front wall has a plurality of signal pin openings extending therethrough, the signal pin openings aligned with the circuit board holes. A second connector body having a front wall is positioned on a second side of the circuit board, and the front wall has a plurality of signal pin openings extending therethrough, the signal pin openings aligned with the circuit board holes. A plurality of signal pins extend through the signal pin openings of the first and second connector bodies and through the circuit board holes. At least one of the plurality of circuit board holes has a diameter larger than a diameter of the signal pin extending therethrough, such that walls of the at least one circuit board hole are spaced apart from the signal pin extending therethrough.
In another embodiment according to the invention, the connector system includes a circuit board having a plurality of holes extending therethrough, the holes having electrically conductive walls. A connector body is attached to the circuit board and has a plurality of signal pin openings and a plurality of shield blade openings, the signal pin openings aligned with the circuit board holes. A plurality of signal pins are retained in the plurality of signal pin openings of the connector body and extend through the circuit board holes. A plurality of shield blades are retained in the plurality of shield blade openings of the connector body. Each of the plurality of shield blades has at a first end thereof a generally right angle shielding portion disposed adjacent a corresponding one of the plurality of signal pins. The circuit board holes are dimensioned such that the electrically conductive walls are spaced apart from the signal pins extending therethrough.
Another aspect of the invention described herein provides a method of mounting a connector system to a circuit board. In one embodiment according to the invention, the method includes forming a plurality of holes extending from a first side of the circuit board to a second side of the circuit board. A first connector body is attached to the first side of the circuit board, the first connector body having a plurality of signal pin openings aligned with the circuit board holes. A second connector body is attached to the second side of the circuit board opposite the first connector body, the second connector body having a plurality of signal pin openings aligned with the circuit board. Signal pins are passed through the aligned circuit board holes and signal pin openings of the first and second header bodies, wherein the circuit board holes are sized such that walls of the circuit board holes are spaced apart from the signal pins.
In the following detailed description of the preferred embodiments, reference is made to the accompanying drawings, which form a part hereof, and in which is shown by way of illustration specific embodiments in which the invention may be practiced. It is to be understood that other embodiments may be utilized and structural or logical changes may be made without departing from the scope of the present invention. The following detailed description, therefore, is not to be taken in a limiting sense, and the scope of the present invention is defined by the appended claims.
Each header connector 100a, 100b includes a connector body 102 configured to receive a plurality of signal pins 104 and a plurality of shield blades 106 therein. The connector bodies 102 may also be configured to receive optional ground pins 108. The signal pins 104 are straight pins, and are retained within connector body 102 by press-fit. In one embodiment, at least two or more of the shield blades 106 are formed from a continuous strip of material. In one embodiment, except for their length, the ground pins 108 are substantially identical to the signal pins 104. In another embodiment, the ground pins 108 are configured to be retained by press-fit in the printed circuit board 30.
The connector body 102 of each header connector 100a, 100b includes a front wall 110 and laterally-extending side walls 112, 114 projecting perpendicularly therefrom. The front wall 110 includes a plurality of signal-pin-receiving openings 116, a plurality of shield-blade-receiving openings 118, and a plurality of ground-pin-receiving openings 120, all of which extend between an internal surface 122 and an external surface 124 of front wall 110. In one embodiment, the plurality of shield-blade-receiving openings 118 are formed to have a generally right angle cross-section, matching the cross-section of the shield blades 106. In one embodiment, the openings 116, 118, 120 include chamfered entrances at one or both of internal surface 122 and external surface 124 to assist in the insertion of pins 104, 108 and shield blades 106. The openings 116, 118, 120 are sized to receive signal pins 104, shield blades 106, and ground pins 108 in either a press-fit or slip-fit manner, as required by the particular application. In some embodiments, pins 104, 108 are retained by press-fit in one header connector 100a, and retained by slip-fit in the other header connector 100b.
When header connectors 100a, 100b are mounted on opposite sides 32, 34 of printed circuit board 30, each signal-pin-receiving opening 116 is aligned with a corresponding signal pin hole 36 extending through printed circuit board 30. As described in greater detail below, a portion or all of signal pin holes 36 have a diameter larger than the diameter of an associated signal pin 104 extending through the hole. In one embodiment, each signal-pin-receiving opening 116 of header connectors 100a, 100b is coaxially aligned with a corresponding signal pin hole 36. The signal pins 104 are configured for insertion into corresponding signal-pin-receiving openings 116 in the header connectors 100a, 100b, and have a length sufficient to allow pins 104 to extend continuously through first header connector 100a, signal pin hole 36 in printed circuit board 30, and second header connector 100b to form an array of signal pins 104 on both sides of printed circuit board 30. Each signal pin 104 thus includes a first end 152 extending above the front wall 110 of the first header connector 100a, and a second end 154 extending above the front wall 110 of the second header connector 100b. In one embodiment, the array of signal pins 104 is configured for reception in an array of pin-insertion windows 230 in mating socket connector 200 (
The plurality of shield blades 106 are formed to include a generally right angle shielding portion 128 configured to be inserted into the plurality of generally right angle shield-blade-receiving openings 118. The generally right angle shielding portion 128 of each of the plurality of shield blades 106 includes substantially perpendicular first leg portion 130 and second leg portion 132. Each shield blade 106 includes a first end 162 and a second end 164. In one embodiment, when shield blades 106 are inserted into connector body 102, the first end 162 of shield blade 106 extends to the plane of internal surface 122 of the front wall 110 of the header connectors 100a, 10b, adjacent to a signal pin 104, such that first end 162 is substantially coplanar with internal surface 122. In another embodiment, when shield blades 106 are inserted into connector body 102, the first end 162 of shield blade 106 extends above the plane of internal surface 122 of the front wall 110 of the header connectors 100a, 100b for connection to a shielded socket connector, as illustrated by dashed lines 107 in
Each strip of shield blades 106 includes at least one shield tail 148 configured for insertion into a corresponding ground hole 38 in the printed circuit board 30. When the signal pins 104 and shield blades 106 are inserted into the front wall 110 of the connector body 102, the shield tails 148 extend outwardly from the external surface 124 of the front wall 110. The shield tails 148 of headers 100a, 100b can be either press fitted into ground holes 38 in the printed circuit board 30 or soldered thereto. Alternatively, the shield tails 148 could be surface mounted to the printed circuit board 30. In one embodiment, shield tails 148 of shield blades 106 are electrically connected to a ground plane 40 within printed circuit board 30. In one embodiment shield blades 106 are commonly grounded. In another embodiment, shield blades 106 are not commonly grounded. In one embodiment, at least one signal pin 104 is electrically connected with ground plane 40 and commonly grounded with at least one shield blade 106 via the ground plane 40.
The number of shield tails 148 may be the same as the number of shield blades 106, or may be different than the number of shield blades 106. In one embodiment, each strip of shield blades 106 has a plurality of shield tails 148, with one shield tail 148 for every two shield blades 106, wherein the shield tails 148 are staggered and aligned with alternate shield blades 106 along the strip of shield blades 106. In other embodiments, other ratios of shield tails 148 to shield blades 106 may be provided, with the shield tails 148 either uniformly or non-uniformly spaced along the length of the strip of shield blades 106. Embodiments having staggered shield tails 148 on shield blades 106 are particularly useful in back-to-back mounting of header connectors 100a, 100b on printed circuit board 30, as the staggered shield tails 148 permit back-to-back mounting of header connectors 100a, 100b without interference between shield tails 148 of the opposing header connectors 100a, 100b (
As best seen in
In one embodiment illustrated in
In one embodiment illustrated in
In one embodiment, two adjacent signal pin holes 36 are merged, such that an elongated oval shaped signal pin hole 36′ is formed (
In one embodiment, a plurality of ground pins 108 are configured for insertion into the plurality of ground-pin-receiving openings 120 in the front wall 110 of the header connector 100. The plurality of ground pins 108 are configured to engage contact arms 296 of corresponding grounding structures of socket connectors 200a, 200b when the socket connectors 200a, 200b are inserted into the header connector 100 as shown in
Socket connectors 200a, 200b may be any of a variety of connector types, such as connectors configured for connection to a printed circuit board (socket connector 200b) or a cable connector (socket connector 200a). In one embodiment according to the invention, socket connectors 200a, 200b are hard metric connectors according to industry standard IEC 61076-4-101. In another embodiment, socket connectors 200a, 200b are a hard metric connector according to the CompactPCI® or FutureBus® industry standards. In each embodiment, socket connectors 200a, 200b includes a plurality of signal contacts 210 for making electrical contact with the array of signal pins 104 of the header connectors 100a, 100b, and at least one shielding element 212 associated with the plurality of signal contacts 210. In one embodiment, the at least one shielding element 212 of the socket connectors 200a, 200b comprises a plurality of strip line shielding elements associated with the plurality of signal contacts 210. When configured to mate with a printed circuit board, socket connector 200b may be provided with signal tails 206 and shield tails 276 that can be either press fitted into holes in a printed circuit board or soldered thereto. In another embodiment, pin tails 206 and shield tails 276 are surface mounted to a printed circuit board.
In addition to the improved electrical performance provided by controlling the impedance of the signal path as it passes through the printed circuit board 30, the connection system 20 described herein provides other advantages, particularly in assembly of the header connectors 100a, 100b and attachment to the printed circuit board 30. In one embodiment, shield blades 106 are first inserted into connector bodies 102 of header connectors 100a, 100b, and the first and second header connectors 100a, 100b sans pins 104, 108 are aligned with and secured to printed circuit board 30 via shield tails 148. Openings 116, 120 in connector bodies 102 are then used as insertion guides and straighteners for pins 104, 108, thereby reducing the probability of stubbing or otherwise damaging pins 104, 108 during assembly.
In another embodiment, shield blades 106 are inserted into connector bodies 102 of first and second header connectors 100a, 100b. Pins 104, 108 are inserted only into the connector body 102 of first header connector 100a prior to attachment to printed circuit board 30, where they are retained by press fit. The pins 104, 108 and shield tails 148 extending from the first header connector 100a are inserted into their corresponding openings 36, 38 in printed circuit board 30, and first header connector 100a is secured to first side 32 of printed circuit board 30 via shield tails 148. Second header connector 100b is then installed over pins 104, 108 on the opposing side 34 of printed circuit board 30. Finally, second header connector 100b is secured to printed circuit board 30 via shield tails 148.
In another embodiment, shield blades 106 are inserted into connector bodies 102 of first and second header connectors 100a, 100b. Pins 104, 108 are also inserted into connector body 102 of first header connector 100a prior to attachment to printed circuit board 30, where they are retained by press fit. Second header connector 100b (with shield blades 106) is attached to second side 34 of the printed circuit board 30. The pins 104, 108 and shield tails 148 extending from first header connector 100a are then inserted into their corresponding openings 36, 38 from the first side 32 of printed circuit board 30, and guided through the corresponding openings 116, 120 in second header connector 100b. First header connector 100a is then secured to first side 32 of printed circuit board 30 via shield tails 148.
In each embodiment, chamfered entrances for openings 116, 118, 120 may be provided at one or both of internal surface 122 and external surface 124 of front wall 110 to assist in the insertion of pins 104, 108, and shield blades 106. Chamfered entrances for openings 116, 120 at external surface 124 are particularly useful for capturing pins 104, 108 as they come through circuit board 30.
All plastic parts of header connectors 100a, 100b and socket connectors 200a, 200b are molded from suitable thermoplastic material, such as liquid crystal polymer (“LCP”), having the desired mechanical and electrical properties for the intended application. The conductive metallic parts are made from, for example, plated copper alloy material, although other suitable materials will be recognized by those skilled in the art. The connector materials, geometry and dimensions are all designed to maintain a specified impedance throughout the part.
Although specific embodiments have been illustrated and described herein for purposes of description of the preferred embodiment, it will be appreciated by those of ordinary skill in the art that a wide variety of alternate and/or equivalent implementations calculated to achieve the same purposes may be substituted for the specific embodiments shown and described without departing from the scope of the present invention. Those with skill in the mechanical, electromechanical, and electrical arts will readily appreciate that the present invention may be implemented in a very wide variety of embodiments. This application is intended to cover any adaptations or variations of the preferred embodiments discussed herein. Therefore, it is manifestly intended that this invention be limited only by the claims and the equivalents thereof.
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