JP2020144989A - Connector and cable with connector - Google Patents

Abstract

To provide a connector which attains reduction of transmission noise by reducing crosstalk, and a cable with connector.SOLUTION: The present invention relates to a connector 1 provided in an end of a cable 11 and comprising a paddle card substrate 2 which is inserted into a slot 101 of an apparatus 100 of a connection target to electrically connect the apparatus 100 and the cable 11. The paddle card substrate 2 includes: multiple pairs of apparatus-side electrodes 22 formed at an end on the side of insertion into the apparatus 100 while being separated so as to be disposed side by side in an insertion direction, and electrically connected to the apparatus 100; and a metallic protective electrode 25 which is provided between the paired apparatus-side electrodes 22, for protecting the paddle card substrate 2. The protective electrode 25 is bisected in the insertion direction, and lengths of two divided protective electrodes 25a and 25b which are divided protective electrodes 25, in the insertion direction are different from each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to a connector and a cable with a connector.

Conventionally, as a cable with a connector connected to a board (so-called motherboard) of a communication device or the like, a cable having a connector with a paddle card board built in is known at the end of a cable for differential signal transmission. A plurality of device-side electrodes that are electrically connected to a communication device board or the like are formed at one end of the paddle card board.

With the recent increase in communication speed, it is desired to expand the band that can be transmitted by a cable with a connector. Therefore, in order to increase the number of channels of the cable with a connector, the number of electrodes on the device side is increased in the paddle card substrate. For example, in Patent Document 1, the number of device-side electrodes is increased by providing a plurality of rows of device-side electrodes on the paddle card substrate.

When a plurality of rows of device-side electrodes are provided on the paddle card substrate as in Patent Document 1, a plurality of rows of contacts that come into contact with the device-side electrodes when the paddle card is inserted are provided in a communication device or the like. Therefore, when the paddle card is inserted, the contactor may slide on the base material between the electrodes on the device side adjacent to each other in the insertion direction of the paddle card board, and may damage or scrape the surface of the paddle card board. Occurs. Therefore, in order to protect the paddle card substrate from contacts, it is possible to form a metal protective electrode called a floating pad or pre-wipe pad between the electrodes on the device side adjacent to each other in the insertion direction of the paddle card substrate. It has been.

The protective electrode is electrically neutral (floating) and is formed between two device-side electrodes (adjacent in the insertion direction of the paddle card substrate) in the same row and separated from both device-side electrodes. Conventionally, one protective electrode is generally formed between the device side electrodes in the same row, but the protective electrode can be divided into two in the insertion direction of the paddle card substrate as an option of the standard. It is recognized, and a structure in which the protective electrode is divided into two at the center in the insertion direction of the paddle card substrate is also known.

Japanese Unexamined Patent Publication No. 10-335019

However, when one protective electrode is formed between the device side electrodes in the same row, between the differential signals that transmit the device side electrodes in the same row at a low frequency (15 G to 25 GHz) that affects even the transmission speed of 25 Gbaud. There is a problem that a large crosstalk occurs.

Further, even when the protective electrode is divided into two equal parts in the insertion direction of the paddle card substrate, a differential signal that transmits the same row of device side electrodes at a frequency (30 to 40 GHz) that affects the transmission speed of 50 Gbaud. There is a problem that a large crosstalk occurs between them.

As described above, in the conventional structure, there is a problem that a large crosstalk is generated between the differential signals transmitted through the device side electrodes in the same row, and the transmission noise is increased due to the deterioration of these crosstalks. ..

Therefore, an object of the present invention is to provide a connector and a cable with a connector in which crosstalk is reduced and transmission noise is reduced.

The present invention is a paddle card provided at the end of a cable for the purpose of solving the above problems, and is inserted into a slot of a device to be connected to electrically connect the device and the cable. A plurality of connectors including a board, wherein the paddle card board is formed at an end portion on an insertion side into the device at a distance so as to be arranged along the insertion direction, and is electrically connected to the device. It has a pair of device-side electrodes and a metal protective electrode for protecting the paddle card substrate provided between each pair of device-side electrodes, and the protective electrode is 2 in the insertion direction. Provided are a connector that is divided and the two divided protective electrodes, which are the divided protective electrodes, have different lengths along the insertion direction.

Further, for the purpose of solving the above problems, the present invention electrically connects the device and the cable by being provided at the end of the cable and inserted into a slot of the device to be connected. The paddle card board is provided with a connector including a paddle card board to be specifically connected to the device, and the paddle card board is formed at an end portion on the insertion side into the device so as to be aligned along the insertion direction. The protective electrode has a plurality of pairs of electrically connected device-side electrodes and a metal protective electrode for protecting the paddle card substrate provided between each pair of the device-side electrodes. However, there is provided a cable with a connector which is divided into two in the insertion direction and has different lengths of the divided protective electrodes along the insertion direction.

According to the present invention, it is possible to provide a connector and a cable with a connector in which crosstalk is reduced and transmission noise is reduced.

It is a schematic block diagram of the connector which concerns on one Embodiment of this invention, (a) is a plan view, (b) is an enlarged view of the main part of (a). It is sectional drawing explaining the insertion of a paddle card board into a device. (A) to (c) are plan views which show the paddle card substrate of the comparative example to be compared with this invention. It is a graph which shows the crosstalk characteristic of the Example and the comparative example by this invention.

[Embodiment]
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

(Overall configuration of cable with connector)
FIG. 1 is a schematic configuration diagram of a connector according to the present embodiment, (a) is a plan view, and (b) is an enlarged view of a main part of (a). As shown in FIGS. 1A and 1B, the cable 10 with a connector includes a cable 11 and a connector 1 according to the present embodiment provided at the end of the cable 11.

In the present embodiment, the cable 10 with a connector is configured to be capable of transmitting and receiving one channel, and a total of two cables 11 of a cable 11 for transmission and a cable 11 for reception are connected to the connector 1. ing. However, the number of cables 11 connected to the connector 1 is not limited to this, and for example, two channels can be transmitted and received using a total of four cables 11 of two for transmission and two for reception. It may be configured. Further, the cable 10 with a connector may only receive or transmit.

(Cable 11)
The cable 11 is a differential signal transmission cable having a pair of signal conductors 11a for transmitting a differential signal. The specific structure of the cable 11 is not particularly limited, but for example, an insulator made of foamed resin or the like is provided so as to collectively cover the pair of signal conductors 11a arranged in parallel, and the periphery of the insulator is provided. A structure in which a shield conductor is provided can be used.

(Connector 1)
The connector 1 has a paddle card board 2 and a case 3 for accommodating the paddle card board 2. In FIG. 1 (a), the case 3 is shown by a broken line, and in FIG. 1 (b), the case 3 is omitted.

The paddle card board 2 is provided at the end of the cable 11 and is inserted into the slot 101 of the device 100 to be connected to electrically connect the device 100 and the cable 11 (FIG. FIG. 2).

The paddle card substrate 2 is formed with a plurality of (four in this case) cable connection electrodes 21 in which the signal conductors 11a of the cable 11 are electrically connected by solder or the like. The cable connection electrode 21 is formed at an end portion (the right end portion in FIGS. 1A and 1B) opposite to the insertion side of the paddle card substrate 2 into the device 100.

Further, the paddle card substrate 2 is formed at the end portion on the insertion side into the device 100 (the left end portion in FIGS. 1A and 1B) so as to be lined up along the insertion direction. It has a plurality of pairs of device-side electrodes 22 that are electrically connected to 100. Here, two pairs (four) of device-side electrodes 22 corresponding to the two cables 11 are formed on the paddle card substrate 2. The device-side electrodes 22 forming the pair are formed so as to face each other in the insertion direction of the paddle card substrate 2. Hereinafter, the device-side electrode 22 arranged on the insertion side into the device 100 will be referred to as a first device-side electrode 22a, and the device-side electrode 22 arranged on the side opposite to the insertion side into the device 100 (cable 11 side) will be referred to. It is called the second device side electrode 22b. The first device side electrodes 22a of each pair are arranged apart from each other in a direction perpendicular to the insertion direction (hereinafter, referred to as a width direction). Similarly, the second device side electrodes 22a of each pair are arranged apart from each other in the width direction.

The cable connection electrode 21 and the device side electrode 22 corresponding to the cable connection electrode 21 are electrically connected to each other via a wiring pattern 23 formed on the surface or inner layer of the paddle card substrate 2 and a coupling capacitor 24. The coupling capacitor 24 serves as a filter that allows only high-frequency AC signals to pass through and blocks DC signals. The coupling capacitor 24 can be omitted.

Further, the paddle card substrate 2 has a metal protective electrode 25 provided between the pair of device side electrodes 22 (between the first device side electrode 22a and the second device side electrode 22b). .. The protective electrode 25 is also called a floating pad or a pre-wipe pad, and serves to protect the surface of the paddle card substrate 2 from being scratched. Each protective electrode 25 is electrically floated without being electrically connected to the other electrodes.

FIG. 2 is a cross-sectional view illustrating insertion of the paddle card substrate 2 into the device 100. As shown in FIG. 2, a first contact 102a and a second contact 102b are provided in the slot 101 of the device 100 so as to be arranged along the insertion direction of the paddle card substrate 2. Both contacts 102a and 102b are configured to be elastically deformable like a spring by, for example, bending a metal strip, and are provided so as to project downward from the upper part of the slot 101. Although not shown in FIG. 2, two first contacts 102a and two second contacts 102b are provided side by side in the width direction of the paddle card substrate 2 so as to correspond to the two pairs of device side electrodes 22. ing.

When the paddle card board 2 is inserted into the slot 101 of the device 100, both contacts 102a and 102b slide on the surface of the paddle card board 2 while being elastically deformed, and the first contact 102a is attached to the first device side electrode 22a. The second contact 102b comes into contact with the second device side electrode 22b and is electrically connected to each other. At this time, the second contact 102b slides on the surface of the paddle card substrate 2 between the first device side electrode 22a and the second device side electrode 22a, but in the present embodiment, the first device side. Since the protective electrode 25 is provided between the electrode 22a and the electrode 22b on the second device side, the second contact 102b slides on the protective electrode 25, and the surface of the paddle card substrate 2 is damaged. Etc. are suppressed. Details of the protective electrode 25 will be described later.

Returning to FIG. 1, the paddle card substrate 2 has a pair of ground electrodes 26 formed so as to collectively sandwich the device side electrode 22 and the protective electrode 25 in the width direction. The card edge connector 28 is formed by the pair of ground electrodes 26 and the pair of device side electrodes 22. Further, the paddle card board 2 is a region other than the region serving as the card edge connector 28 of the paddle card substrate 2, and is around the region where the cable connection electrode 21, the wiring pattern 23, and the coupling capacitor 24 are formed. It has a ground pattern 27 formed to cover the surface of the region. The end portion of the ground electrode 26 (the end portion opposite to the insertion side of the paddle card substrate 2) is electrically connected to the ground pattern 27. The ground electrode 26 and the ground pattern 27 have a ground potential (so-called signal ground).

(Protective electrode 25)
In the connector 1 according to the present embodiment, the protection electrode 25 is divided into two in the insertion direction of the paddle card substrate 2, and the two divided protection electrodes 25a and 25b, which are the divided protection electrodes 25, are inserted. The lengths L3 and L4 along the direction are different from each other. Hereinafter, the length along the insertion direction of the paddle card substrate 2 is simply referred to as a length. Further, the split protection electrode arranged on the insertion side into the device 100 (the electrode 22a side on the first device side) is called the first split protection electrode 25a, and is on the opposite side to the insertion side into the device 100 (second device). The split protection electrode arranged on the side electrode 22b side) is referred to as a second split protection electrode 25b.

When the protective electrode 25 is provided, the crosstalk between the differential signals transmitting the paired device-side electrodes 22a and 22b causes resonance between the device-side electrodes 22a and 22b via the protective electrode 25. to cause. By dividing the protective electrode 25 as in the present embodiment, the resonance frequency is increased by the division. Further, as in the present embodiment, by making the lengths L3 and L4 of the two split protection electrodes 25a and 25b different, the resonance frequency changes between the two split protection electrodes 25a and 25b, and the cross caused by resonance changes. It becomes possible to suppress the deterioration of talk. That is, by unequally dividing the protective electrode 25 as in the present embodiment, differential crosstalk due to resonance coupling with the protective electrode 25 arranged between the device side electrodes 22a and 22b is reduced. Becomes possible.

In order to suppress resonance between the device side electrodes 22a and 22b and the split protection electrodes 25a and 25b, the lengths of the split protection electrodes 25a and 25b L3. It is more desirable that L4 is different from the lengths L1 and L2 of the device side electrodes 22a and 22b adjacent to the split protection electrodes 25a and 25b in the insertion direction. In the present embodiment, the length L1 of the first device side electrode 22a is 1.7 mm, and the length L2 of the second device side electrode 22b is 1.65 mm. Further, in the present embodiment, the length L3 of the first division protection electrode 25a is set to 2.30 mm, and the length L4 of the second division protection electrode 25b is set to 2.16 mm.

If the length L3 of the first division protection electrode 25a and the length L4 of the second division protection electrode 25b are very close to each other, crosstalk cannot be sufficiently suppressed, so that the protection electrode 25 It is desirable that the difference in length (| L3-L4 |) between the two split protection electrodes 25a and 25b constituting the above is 0.1 mm or more. In the present embodiment, the difference in length (| L3-L4 |) is 0.14 mm. Further, for the same reason, of the two split protection electrodes 25a and 25b constituting the protection electrode 25, the length L3 of the longer split protection electrode 25a is the length of the shorter split protection electrode 25b. The ratio (L3 / L4) divided by L4 is preferably 1.045 or more.

Further, in the present embodiment, only the differential signal of two channels is transmitted, but if the number of channels to be transmitted is increased, the distance between the electrodes becomes narrow and crosstalk between pairs becomes a problem. .. In such a case, in order to suppress crosstalk between pairs, the lengths of all the split protection electrodes 25a and 25b formed on the same surface of the paddle card substrate 2 may be different from each other. desirable. The distance between one split protection electrode 25a and one split protection electrode 25b is the same as the distance between the other split protection electrode 25a and the other split protection electrode 25b. This is because if these distances are not the same, the impedance balance between the differential wirings connected to the first device side electrode 22a or the second device side electrode 22b will be lost.

(Crosstalk characteristics)
Next, the crosstalk characteristics of the connector 1 were examined. The connectors 1 shown in FIGS. 1A and 1B were prototyped, and SDD41, which is an S parameter indicating crosstalk, was obtained by simulation. Here, when a differential signal is input to the first device side electrode 22a, the amount of passage (cross) in the differential mode in the wiring of the inner layer connected to the second device side electrode 22b at the position shown by the broken line A in FIG. Talk) was set to SDD41. Further, for comparison, Comparative Example 1 in which the protective electrode 25 is omitted as shown in FIG. 3A and the protective electrode 25 are undivided (length 4.) as shown in FIG. 3B. The same measurement was performed for Comparative Example 2 (60 mm) and Comparative Example 3 in which the protective electrode 25 was equally divided (D3 = D4 = 2.23 mm) as shown in FIG. 3 (c). .. In Examples and Comparative Examples 1 to 3, the width of the device side electrode 22 and the protective electrode 25 was set to 0.54 mm. The results are summarized in FIG.

As shown in FIG. 4, in Comparative Example 1 in which the protective electrode 25 is omitted, good crosstalk characteristics are obtained. However, in Comparative Example 1, since the protective electrode 25 is not provided, the surface of the paddle card substrate 2 may be damaged if the connector 1 is repeatedly inserted and removed. In addition, damage such as plating peeling on the surface of the second contact 102b of the device 100 may occur.

In Comparative Example 2 in which the protective electrode 25 is undivided, the SDD 41 is high in the frequency band of 15 GHz to 25 GHz, and the crosstalk characteristics are deteriorated. This frequency band of 15 GHz to 25 GHz is a band that is affected by the transmission speed of 25 Gbaud.

In Comparative Example 3 in which the protective electrode 25 is equally divided, the SDD 41 is high in the frequency band of 30 GHz to 40 GHz, and the crosstalk characteristics are deteriorated. This frequency band of 30 GHz to 40 GHz is a band that is affected by the transmission speed of 50 Gbaud.

On the other hand, in the examples of the present invention, although the SDD41 is slightly higher in the frequency band of 30 GHz to 40 GHz, the SDD 41 is significantly improved as compared with Comparative Examples 2 and 3. As described above, according to the present embodiment, the SDD 41 can be reduced in a wide frequency band, and the crosstalk characteristics can be improved. Furthermore, according to the present embodiment, good crosstalk characteristics can be obtained even in the frequency band up to 42 GHz required for the next-generation 56 Gbaud.

(Actions and effects of embodiments)
As described above, in the connector 1 according to the present embodiment, the protective electrode 25 is divided into two in the insertion direction, and the lengths D3 and D4 of the two divided protective electrodes 25a and 25b are divided into two. They are different from each other. This makes it possible to change the resonance frequency between the two split protection electrodes 25a and 25b and suppress the deterioration of crosstalk caused by resonance. Therefore, according to the present embodiment, it is possible to realize the connector 1 and the cable with a connector 10 in which crosstalk is reduced and transmission noise is reduced.

(Summary of embodiments)
Next, the technical idea grasped from the above-described embodiment will be described with reference to the reference numerals and the like in the embodiment. However, the respective symbols and the like in the following description are not limited to the members and the like in which the components in the claims are specifically shown in the embodiment.

[1] The device (100) and the cable (11) are electrically connected by being provided at the end of the cable (11) and inserted into the slot (101) of the device (100) to be connected. A connector (1) provided with a paddle card board (2) to be connected so that the paddle card board (2) is aligned with the end on the insertion side into the device (100) along the insertion direction. The paddle card substrate (2) provided between a plurality of pairs of device side electrodes (22) formed apart from each other and electrically connected to the device (100) and the device side electrodes (22) of each pair. ), The protective electrode (25) is divided into two in the insertion direction, and the divided protective electrode (25) is used. A connector (1) in which two split protection electrodes (25a, 25b) have different lengths along the insertion direction.

[2] The device-side electrode (22) having a length along the insertion direction of the split protection electrode (25a, 25b) adjacent to the split protection electrode (25a, 25b) in the insertion direction. The connector (1) according to [1], which has a different length along the insertion direction.

[3] The lengths of all the split protection electrodes (25a, 25b) formed on the same surface of the paddle card substrate (2) along the insertion direction are different from each other, [1] or [ 2] The connector (1).

[4] The difference in length of the two divided protection electrodes (25a, 25b) constituting the protection electrode (25) along the insertion direction is 0.1 mm or more, [1] to [1] to [ 3] The connector (1) according to any one of the items.

[5] The cable (11) and the cable (11) and the cable (100) are provided by being inserted into the slot (101) of the device (100) to be connected. A connector (1) provided with a paddle card board (2) for electrically connecting to 11) is provided, and the paddle card board (2) is attached to an end portion on the insertion side into the device (100). Provided between a plurality of pairs of device-side electrodes (22) formed so as to line up along the insertion direction and electrically connected to the device (100), and each pair of device-side electrodes (22). It has a protective metal protective electrode (25) for protecting the paddle card substrate (2), and the protective electrode (25) is divided into two in the insertion direction. A cable with a connector (10) in which two split protective electrodes (25a, 25b), which are the protective electrodes (25), have different lengths along the insertion direction.

Although the embodiments of the present invention have been described above, the embodiments described above do not limit the invention according to the claims. It should also be noted that not all combinations of features described in the embodiments are essential to the means for solving the problems of the invention.

In addition, the present invention can be appropriately modified and implemented without departing from the spirit of the present invention.

1 ... Connector 2 ... Paddle card substrate 22 ... Device side electrode 25 ... Protective electrode 25a ... First split protection electrode (split protection electrode)
25b ... Second split protection electrode (split protection electrode)
10 ... Cable with connector 11 ... Cable 100 ... Equipment 101 ... Slot

Claims (5)

A connector provided at the end of a cable and provided with a paddle card board that electrically connects the device and the cable by being inserted into a slot of the device to be connected.
The paddle card board is
A plurality of pairs of device-side electrodes formed at the end on the insertion side to the device so as to be aligned along the insertion direction and electrically connected to the device.
Each pair has a metal protective electrode for protecting the paddle card substrate provided between the device side electrodes.
The protective electrode is divided into two in the insertion direction, and the lengths of the two divided protective electrodes, which are the divided protective electrodes, along the insertion direction are different from each other.
connector. The length of the split protection electrode along the insertion direction is different from the length of the device side electrode adjacent to the split protection electrode in the insertion direction along the insertion direction.
The connector according to claim 1. The lengths of all the split protection electrodes formed on the same surface of the paddle card substrate along the insertion direction are different from each other.
The connector according to claim 1 or 2. The difference in length of the two divided protective electrodes constituting the protective electrode along the insertion direction is 0.1 mm or more.
The connector according to any one of claims 1 to 3. With the cable
A connector provided at the end of the cable and provided with a paddle card board for electrically connecting the device and the cable by being inserted into a slot of the device to be connected is provided.
The paddle card board is
A plurality of pairs of device-side electrodes formed at the end on the insertion side to the device so as to be aligned along the insertion direction and electrically connected to the device.
Each pair has a metal protective electrode for protecting the paddle card substrate provided between the device side electrodes.
The protective electrode is divided into two in the insertion direction, and the lengths of the divided protective electrodes along the insertion direction are different.
Cable with connector.

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