JP2012174597A - Connector for differential signal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small connector for a differential signal capable of reducing a skew of a differential signal pair.SOLUTION: A connector for a differential signal includes plural pairs of contacts 22 for signals; plural grounding contacts 23; and an insulative housing 24 holding the contacts for the signals and the grounding contacts. On a first connection side for connecting with a connection party, the grounding contacts are arranged on both sides of each pair of the contacts for the signals, so as to form a contact row at a constant pitch. Meanwhile, on a second connection side for connecting with a substrate, the plural grounding contacts are isolated from each other in a first row R1, and a pair of the contacts for the signals arranged on both sides of the grounding contacts on the first connection side are distributed in a second row R2 and a third row R3 positioned on both sides of the first row. Thereby, on the second connection side, a pair of the contacts for the signals are aligned in a zigzag manner.

Description

  The present invention relates to a connector (herein referred to as “differential signal connector”) used to connect a line for transmitting a differential signal pair.

  A differential transmission method is known in which a differential signal pair consisting of signals having opposite phases is transmitted to two signal lines forming a pair. Since the differential transmission system has a feature that the data transmission speed can be increased, it has recently been put into practical use in various fields.

  For example, when the differential transmission method is used for data transmission between the device and the liquid crystal display, the device and the liquid crystal display are provided with a display port connector designed according to the display port standard. As this display port standard, VESA Display Port standard 1.0 and its version 1.1a are known.

  This display port connector is a kind of connector for differential signals, and has a first connection side for connection to a connection partner and a second connection side for connection to a substrate of a device or a liquid crystal display. Yes. The first connection side configuration is strictly determined by the display port standard because of the relationship with the connection partner, but the second connection side configuration is relatively free. This type of differential signal connector is disclosed in Patent Document 1.

  FIG. 4 shows a contact assembly (hereinafter also referred to as “contact assembly”) included in a conventional connector for differential signals which is different from that disclosed in Patent Document 1 but has a similar form. The contact assembly 1 includes a plurality of pairs of signal contacts 2, a plurality of ground contacts 3, and an insulating housing 4 that holds the signal contacts 2 and the ground contacts 3. On the first connection side for connection to the connection partner, ground contacts 3 are arranged on both sides of each pair of signal contacts 2 to form a contact row with a constant pitch. Further, the signal contact 2 and the ground contact 3 are bent in a direction intersecting the contact row, and the signal contact 2 and the ground contact 3 are formed in two rows in a staggered manner on the second connection side for connecting to the substrate. It is an array.

  FIG. 5 shows a substrate 5 for mounting a differential signal connector including the contact assembly 1 of FIG. A plurality of through holes 6 are formed in the substrate. These through holes 6 are arranged in a zigzag pattern in two rows corresponding to the arrangement of the signal contacts 2 and the ground contacts 3 on the second connection side of the differential signal connector.

  When the differential signal connector 1 is mounted on the substrate 5, the signal contact 2 and the ground contact 3 are inserted into the through holes 6. Around the opening of the through hole 6, lands 7 each having a donut-like conductor pattern are formed. Then, the wiring pattern 8 is drawn in parallel along the substrate 5 only from the land 7 formed corresponding to the through hole 6 into which the signal contact 2 is inserted. Therefore, the signal contact 2 is connected to the wiring pattern 8 through the through hole 6 and the land 7.

JP 2008-41656 A

  In the differential signal connector described above, the arrangement of the signal contacts and the ground contacts in two rows in a staggered manner on the second connection side itself enables the miniaturization of the connector easily. However, when the size of the connector is actually reduced, there is the following problem due to the difference in the length of the differential signal contacts forming a pair.

  A plurality of pairs of signal contacts and a plurality of ground contacts can be manufactured together by punching one conductor plate and then bending it as shown in FIG. In order to facilitate the manufacturing process at that time, it was common knowledge of those skilled in the art that the contact tips are equally spaced and the number of contact folding times is two. However, in the state of the contact development view, there is a difference in the lengths of the differential signal contacts that form a pair in order to make the contact tip intervals equal. This difference in length causes a difference in propagation time (skew) in the differential signal pair in the differential signal connector.

  Further, due to the difference in length, the differential signal contacts forming a pair and the ground contacts on both sides of the second connection side, that is, on the substrate, are divided into two rows instead of the same row. May be placed. In this case, as can be seen from the fact that there are wiring patterns drawn out with different lengths from lands formed in different rows, there is a difference in the lengths of the paired wiring patterns connected to the paired signal contacts. Sometimes. The difference in the length of the pair of wiring patterns also causes a skew in the differential signal pair.

  Therefore, an object of the present invention is to provide a differential signal connector that is small in size and can reduce the skew of a differential signal pair.

  According to one aspect of the present invention, there is provided a differential signal connector including a plurality of pairs of signal contacts, a plurality of ground contacts, and an insulating housing that holds the signal contacts and the ground contacts. A first connection side for connection to the connection partner and a second connection side for connection to the substrate, and on the first connection side, on both sides of each pair of the signal contacts The ground contacts are arranged to form contact rows with a constant pitch, and on the second connection side, the plurality of ground contacts are arranged apart from each other in the first row, and the first connection The signal contact pairs arranged on both sides of the ground contact on the side are distributed and arranged in the second and third rows located on both sides of the first row, thereby Serial in the second connecting side connector for differential signals, characterized in that the pair of contacts for the signal and staggered sequence is obtained.

  The connector according to one embodiment of the present invention can be easily downsized and the skew of the differential signal pair can be reduced.

The state mounted in the board | substrate of the connector for differential signals which concerns on one Embodiment of this invention is shown, (a) is a front view, (b) is a right view, (c) is a bottom view, (d) is ( Sectional drawing obtained along the Id-Id line of a). The lower side contact assembly contained in the connector for differential signals of FIG. 1 is shown, (a) is a perspective view, (b) is a right view, (c) is a rear view, (d) is a bottom view. FIG. 3 is a contact development view in a manufacturing process of a signal contact and a ground contact included in the lower contact assembly of FIG. 2. The contact assembly contained in the conventional connector for differential signals is shown, (a) is a perspective view, (b) is a bottom view. The bottom view of the board | substrate which mounts the connector for conventional differential signals. FIG. 5 is a contact development view in a manufacturing process of a signal contact and a ground contact included in the contact assembly of FIG. 4.

  A differential signal connector according to an embodiment of the present invention will be described with reference to FIG.

  The differential signal connector 10 in FIG. 1 is a 20-core printed circuit board mounting type connector having two upper and lower rows of contacts, and is mounted on the printed circuit board 11 in use. The front side to which a mating connector (not shown) to which the differential signal connector 10 is connected is connected is called a first connection side, and the bottom side connected to the printed circuit board 11 is called a second connection side. . On the first connection side, a fitting protrusion 12 for fitting the mating connector is provided with a shape extending in the left and right directions parallel to the fitting surface. The second connection side will be described in detail later.

  The printed board 11 used here is a multilayer board. As can be seen from FIG. 1 (c) showing the lower surface 11 a, a number of through holes 13 are formed in the printed board 11. Around the opening of the through hole 13, lands 14 each having a donut-like conductor pattern are formed. In addition, wiring patterns 15 are drawn in parallel along the substrate 11 from some of the lands 14. The position and role of the through hole 13 will be clarified later.

  The differential signal connector 10 includes an upper contact assembly (hereinafter also referred to as “upper contact assembly”) 16, a lower contact assembly (hereinafter also referred to as “lower contact assembly”) 17, And a conductive connector shell 18 collectively enclosing the upper and lower contact assemblies 16, 17. The upper contact assembly 16 includes a number of conductive upper contacts 19, referred to herein as additional contacts, and an insulating upper housing 21 that holds these upper contacts 19. The upper contact 19 has a front end arranged on the upper portion of the fitting protrusion 12, further rearwardly bent at a right angle downward, and a lower end soldered to a wiring pattern on the upper surface (not shown) of the printed circuit board 11 by an SMT structure. Is done. The connector shell 18 has a plurality of fixing legs 18 a and 18 b that are fixed to the printed circuit board 11. The differential signal connector 10 is firmly fixed to the printed circuit board 11 by engaging the fixing legs 18 a and 18 b with the printed circuit board 11. The lower contact assembly 17 will be described in detail later.

  Next, the lower contact assembly 17 will be described in detail with reference to FIG.

  The lower contact assembly 17 includes three pairs of conductive signal contacts 22, four conductive ground contacts 23, and an insulating lower housing holding the signal contacts 22 and the ground contacts 23. 24. On the first connection side of the lower housing 24, a contact line having a constant pitch (preferably 0.7 mm or less) extending in the first direction A1 with the ground contacts 23 disposed on both sides of each pair of signal contacts 22 Is forming.

  All of the signal contact 22 and the ground contact 23 extend rearward in the second direction A2 orthogonal to the first direction A1 and pass through the lower housing 24, and then bend at a right angle on the opposite side of the lower housing 24. And extends downward in a third direction A3 orthogonal to the first direction A1 and the second direction A2. In the following description, the signal contact 22 and the ground contact 23 may be collectively referred to as a lower contact 25.

  As can be seen from FIG. 1, on the first connection side of the differential signal connector 10, the lower contact 25 is arranged so as to face the lower portion of the fitting protrusion 12 and to be opposed to the upper contact 19. Therefore, the mating connector contacts the upper contact 19 and the lower contact 25 when fitted to the fitting protrusion 12, and as a result, is electrically connected to the differential signal connector 10. Here, a portion of the lower contact 25 that contacts the mating connector is referred to as a connector contact portion.

  On the other hand, on the second connection side of the differential signal connector 10, the lower contact 25 is inserted into the through hole 13 of the printed circuit board 11 and connected to the land 14 on the lower surface 11 a of the printed circuit board 11 by soldering. Since soldering is performed on the lower surface 11a of the printed circuit board 11, it is possible to easily determine whether soldering is good or not by visual observation when the connector is mounted. Here, a portion of the lower contact 25 that is inserted into the through hole 13 is referred to as a substrate connection portion.

  The diameter of the through hole 13 of the printed circuit board 11 is designed to be at least slightly larger than the diagonal length of the contact when the contact has a square cross section. Further, a land 14 is formed around the through hole 13 and it is necessary to insulate the adjacent through hole 13. Considering these, it is preferable to set an interval of about 0.8 mm in the through hole 13.

  In FIG. 2, the substrate connecting portions of the lower contact 25 are arranged in three parallel rows that are separated from each other in the second direction A2 and extend in the first direction A1. More specifically, the substrate connection portions of the plurality of ground contacts 23 are arranged apart from each other in the first row R1, and the connector contact portions 22 are arranged on both sides of the ground contact 23. Are distributed and arranged in the second row R2 and the third row R3 located on both sides of the first row R1. As a result, the pair of substrate connection portions of the signal contacts 22 are arranged in a staggered pattern on both sides of the first row R1, as can be seen from FIG.

  Here, among the plurality of signal contacts 22, those arranged in the second row R <b> 2 are designed to have substantially the same length, and those arranged in the third row R <b> 3 are substantially the same. Designed to length. That is, the lengths of the pairs of signal contacts 22 arranged in the same row are made equal. Then, the signal contact 22 pair is connected to the second contact portion 22 by the difference in bending between the first connection portion side and the second connection portion side, specifically, the difference in bending position. This is distributed to the row and the third row R3. The ground contact 23 is arranged in the first row R1 due to the difference in the bending position of the signal contact 22 between the first connection portion side and the second connection portion side. Instead of making a difference in the bending position, the signal contact 22 and the ground contact 23 can be arranged in three rows on the second connecting portion side according to the difference in the number of times of bending. May be.

  Further, on the second connection side, each pair of signal contacts 22 is arranged in correspondence between adjacent ones of the ground contacts 23, and the pitch in each pair of signal contacts 22 is greater than the pitch of the contact row. Also designed a little bigger.

  In addition, the ground contact 23 is disposed between the pair of signal contacts 22 so as to correspond to each other, and on the first connection side, the ground contact 23 and two signals disposed adjacent to both sides thereof are disposed. The contacts 22 are arranged in a direction that obliquely intersects the first, second, and third rows R1, R2, and R3 on the second connection side.

  The three pairs of conductive signal contacts 22 and the four conductive ground contacts 23 described above can be easily formed from one conductor plate 26 by pressing as shown in the development view of FIG. Is possible. In the conductor plate 26, reference numerals 22 ′ and 23 ′ are respectively attached to portions that become the signal contact 22 and the ground contact 23, and reference numerals 27 and 28 are respectively attached to the bent portions.

  Needless to say, the numerous through holes 13 of the printed circuit board 11 are formed at positions corresponding to the above-described arrangement of the signal contact 22 and the ground contact 23 on the second connection side.

  More specific description will be given below.

  A large number of lower contacts 25 are arranged from the upper side of FIG. 3 from the ground contact 23 ', signal contact 22', signal contact 22 ', ground contact 23', signal contact 22 ', signal contact 22', ground. The contacts 23 ', the signal contacts 22', the signal contacts 22 ', and the ground contacts 23' are arranged in this order.

  Here, the pair of signal contacts 22 adjacent to each other connects lines for transmitting a differential signal pair composed of signals having opposite phases, and will be referred to as a + Sig contact and a −Sig contact, respectively, in the following description. Of the through holes 13, those in which + Sig contacts are inserted are referred to as + Sig through holes, those in which −Sig contacts are inserted are referred to as −Sig through holes, and those in which the ground contact 23 is inserted are GND through. Call it a hall. Of the wiring patterns 15, one connected to the + Sig through hole is called a + Sig wiring pattern, and one connected to the −Sig through hole is called a −Sig wiring pattern.

  According to the differential signal connector described above, since the + Sig through hole and the −Sig through hole are arranged in parallel with the connector fitting surface, the + Sig wiring pattern and the −Sig wiring pattern on the lower surface 11a of the printed board 11 which is a multilayer board. It is possible to form a wiring pattern that is parallel to the rear of the connector and is the same length. Therefore, the skew in the differential signal is small, and in the above description, the case of connecting a line for transmitting a pair of differential signals has been described, but the same applies to the case of transmitting a plurality of pairs of differential signals. The effect of can be obtained.

  In addition, this invention is not limited to the said embodiment, The one part or all part can also be described like the following additional remarks, but it is not restricted to them.

(Appendix 1)
A differential signal connector including a plurality of pairs of signal contacts, a plurality of ground contacts, and an insulating housing holding the signal contacts and the ground contacts,
Having a first connection side for connecting to the connection partner and a second connection side for connecting to the substrate;
On the first connection side, the ground contacts are arranged on both sides of each pair of the signal contacts to form a contact row having a constant pitch,
On the second connection side, the plurality of ground contacts are arranged apart from each other in a first row, and the signal contacts arranged on both sides of the ground contact on the first connection side are arranged. The pairs are distributed and arranged in the second and third rows located on both sides of the first row, whereby the signal contact pairs are arranged in a staggered arrangement on the second connection side. A connector for differential signals.

(Appendix 2)
Among the plurality of signal contacts, those arranged in the second row are designed to have substantially the same length, and those arranged in the third row have substantially the same length. The differential signal connector according to Supplementary Note 1, which is designed.

(Appendix 3)
The signal contact is bent in a direction intersecting the contact row between the first connection portion side and the second connection portion side, and the pair of signal contacts is changed to the second connection portion by the difference in bending. The differential signal connector according to appendix 1 or 2, which is distributed to the third row and the third row.

(Appendix 4)
Appendix 3 wherein the ground contact is bent in a direction intersecting the contact row between the first connection portion side and the second connection portion side, and the ground contact is disposed in the first row. The connector for differential signals as described.

(Appendix 5)
5. The differential signal connector according to claim 1, wherein, on the second connection side, each pair of the signal contacts is disposed so as to correspond between adjacent ones of the ground contacts.

(Appendix 6)
The differential signal connector according to any one of appendices 1-5, wherein, on the second connection side, a pitch in the pair of signal contacts is designed to be larger than a pitch of the contact row.

(Appendix 7)
The differential signal connector according to any one of appendices 1-6, wherein, on the second connection side, the ground contact is disposed so as to correspond to the pair of signal contacts.

(Appendix 8)
In the second connection side, in the first connection side, the ground contact and two signal contacts arranged adjacent to both sides thereof are obliquely intersected with the first row. The connector for differential signals according to any one of appendices 1-7, arranged in an array.

(Appendix 9)
The differential signal connector according to any one of appendices 1-8, wherein the first row, the second row, and the third row are parallel to each other.

(Appendix 10)
The difference according to any one of appendices 1-9, further including a plurality of additional contacts, wherein, on the first connection side, the additional contacts are arranged to be opposed to the contact row with a space therebetween. Motion signal connector.

1 Contact assembly (contact assembly)
DESCRIPTION OF SYMBOLS 2 Signal contact 3 Ground contact 4 Housing 5 Board | substrate 6 Through hole 7 Land 8 Wiring pattern 10 Differential signal connector 11 Printed circuit board 11a (printed circuit board) Lower surface 12 Fitting protrusion 13 Through hole 14 Land 15 Wiring pattern 16 Upper contact Assembly (upper contact assembly)
17 Lower contact assembly (lower contact assembly)
18 Connector shells 18a, 18b Fixing legs 19 Upper contact 21 Upper housing 22 Signal contact 22 'Part of conductor plate serving as signal contact 23 Ground contact 23' Part of conductor plate serving as ground contact 24 Lower housing (Housing as claimed)
25 Lower contact 26 Conductor plate 27, 28 Part to be bent R1 1st row R2 2nd row R3 3rd row

According to one aspect of the present invention, there is provided a differential signal connector including a plurality of pairs of signal contacts, a plurality of ground contacts, and an insulating housing that holds the signal contacts and the ground contacts. A first connection side for connection to the connection partner and a second connection side for connection to the substrate, and on the first connection side, on both sides of each pair of the signal contacts The ground contacts are arranged to form contact rows with a constant pitch, and on the second connection side, the plurality of ground contacts are arranged apart from each other in the first row, and the first connection two pairs of the signal contacts disposed adjacent to opposite sides of the ground contact on the side, by distributing the second row and the third row positioned on either side of the first row are arranged, In said second connection side differential signal connector, characterized in that a plurality pairs of contacts for the signals and with staggered obtained by Les.
According to another aspect of the present invention, there is provided a connector including a plurality of contacts and an insulative housing that holds the contacts, the first connection side for connecting to a connection partner, and the connection to the substrate. A plurality of first contacts spaced from each other in a central first row on the second connection side, and both sides of the first row. And divided into a plurality of second contacts arranged as a plurality of pairs divided into a second row and a third row located on the second connection side, and on the second connection side, the plurality of pairs of the second contacts are Those arranged in the second row and those arranged in the third row are arranged so as to be alternately opposed to the adjacent intervals of the first contact, whereby the second connection side The second links on either side of the first row. A plurality of pairs of tacts are arranged in a staggered arrangement, and on the first connection side, the first contacts are arranged in a line at intervals, and a plurality of pairs of the second contacts are adjacent to the first contacts. Thus, a connector is obtained in which the first contacts and the second contacts form one contact row on the first connection side.

Claims (10)

A differential signal connector including a plurality of pairs of signal contacts, a plurality of ground contacts, and an insulating housing holding the signal contacts and the ground contacts,
Having a first connection side for connecting to the connection partner and a second connection side for connecting to the substrate;
On the first connection side, the ground contacts are arranged on both sides of each pair of the signal contacts to form a contact row having a constant pitch,
On the second connection side, the plurality of ground contacts are arranged apart from each other in a first row, and the signal contacts arranged on both sides of the ground contact on the first connection side are arranged. The pairs are distributed and arranged in the second and third rows located on both sides of the first row, whereby the signal contact pairs are arranged in a staggered arrangement on the second connection side. A connector for differential signals.   Among the plurality of signal contacts, those arranged in the second row are designed to have substantially the same length, and those arranged in the third row have substantially the same length. The differential signal connector according to claim 1, which is designed.   The signal contact is bent in a direction intersecting the contact row between the first connection portion side and the second connection portion side, and the pair of signal contacts is changed to the second connection portion by the difference in bending. The differential signal connector according to claim 1, wherein the differential signal connector is assigned to the first row and the third row.   The ground contact is bent in a direction intersecting the contact row between the first connection portion side and the second connection portion side, and the ground contact is disposed in the first row. The connector for differential signals as described in 1.   5. The differential signal connector according to claim 1, wherein, on the second connection side, each pair of the signal contacts is disposed so as to correspond between adjacent ones of the ground contacts. 6. .   6. The differential signal connector according to claim 1, wherein a pitch in the pair of signal contacts is designed to be larger than a pitch of the contact row on the second connection side.   The differential signal connector according to any one of claims 1 to 6, wherein, on the second connection side, the ground contact is disposed so as to correspond to the pair of the signal contacts.   In the second connection side, in the first connection side, the ground contact and two signal contacts arranged adjacent to both sides thereof are obliquely intersected with the first row. The connector for differential signals as described in any one of Claims 1-7 arranged in order.   The differential signal connector according to claim 1, wherein the first row, the second row, and the third row are parallel to each other.   10. The device according to claim 1, further comprising a plurality of additional contacts, wherein the additional contacts are arranged on the first connection side so as to face the contact row with a space therebetween. Differential signal connector.

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