The present invention relates to a connector.
Some receptacle connectors mounted on a mounting circuit board may include a plurality of pin groups each having a plurality of contact pins and a housing for holding those pin groups.
In such a connector, a first pin group and a second pin group are arranged so as to face each other with a predetermined spacing therebetween, for example, and when a plug connector has been connected to the receptacle connector, a circuit board of the plug connector is inserted between the first pin group and the second pin group (for example, U.S. Pat. No. 9,780,512 and Japanese Patent Application Laid-Open No. 2011-146210).
When the circuit board has been inserted, a part of each contact pin of the first pin group and a part of each contact pin of the second pin group come into contact with the circuit board and are thus deformed in the direction away from each other. In this state, the portion of the contact pin in contact with the inner wall face of the housing applies outward force to the wall of the housing.
In response, the wall of the housing is deflected and deformed so as to expand outward by the force received from the contact pins. In particular, when it is not possible to connect mutually facing walls to each other (for example, when it is required to form a space inside the housing to accommodate other components), the walls of the housing are easily deformed. When the walls of the housing are then deformed, the contact load of each contact pin against the circuit board is reduced, which may lead to inability of obtaining desired contact performance.
Accordingly, the present invention intends to provide a connector in which a housing is reinforced in order to suppress deformation of the housing and thus realize good contact performance of contact pins.
To achieve the object described above, a connector of the present invention employs the following solutions.
A connector according to the first aspect of the present invention configured to be mounted on an external circuit board and receive an external module board of an external module inserted along a first direction includes: when a direction orthogonal to the first direction is defined as a second direction, and a direction orthogonal to the first direction and the second direction is defined as a third direction, a plurality of contact pins configured to come into contact with the external module board; a housing holding the plurality of contact pins; and a reinforcing member attached to the housing, the housing includes a base part, an intermediate part, and a tip part from the external circuit board side along the first direction, the base part includes a bottom face facing the external circuit board, the tip part includes a slot opening into which the external module board is to be inserted, the intermediate part includes a smaller dimension in the second direction and/or a smaller dimension of the third direction than the base part and the tip part, and the reinforcing member is an annular plate having four sides surrounding the intermediate part.
According to the connector of the present aspect, the reinforcing member is attached, thereby the housing can be reinforced, and deformation of the housing can thus be suppressed. Accordingly, the contact pressure of the contact pins can be suitably maintained. Thus, good signal transmission characteristics can be realized up to a high-frequency range.
In the connector according to the second aspect of the present invention, dependent on first aspect, the tip part and the base part have substantially the same dimension in the second direction, and the intermediate part includes at least a smaller dimension in the second direction than the base part and the tip part.
According to the connector of the present aspect, the inner dimensions of the reinforcing member can be increased. This can improve the rigidity of the reinforcing member.
In the connector according to the third aspect of the present invention dependent on first aspect and the second aspect, the reinforcing member is configured such that at least one side of the four sides and the remaining sides are dividable from each other.
According to the connector of the present aspect, even with the constricted intermediate part, the reinforcing member can be attached to the intermediate part.
The connector according to the fourth aspect of the present invention dependent on any one of the first aspect to the third aspect, includes a second reinforcing member attached to the housing, and the second reinforcing member is an annular plate having four sides surrounding the intermediate part, and is overlapped on the reinforcing member and configured such that at least one side of the four sides and the remaining sides are dividable from each other.
According to the connector of the present aspect, the second reinforcing member is attached, thereby the housing can be further reinforced, and deformation of the housing can thus be further suppressed. Accordingly, good contact performance of contact pins can be realized.
In the connector according to the fifth aspect of the present invention dependent on fourth aspect, the reinforcing member is configured such that a divided piece that is one side of the four sides is dividable from remaining three sides, the second reinforcing member is configured such that a second divided piece that is one side of the four sides is dividable from remaining three sides, and the divided piece and the second divided piece are at positions facing each other when viewed in the first direction.
According to the connector of the present aspect, since it is avoided that two connection portions (connection portions between the divided piece and other portions) whose strength may be inferior to other portions are arranged only on one side of the intermediate part, the intermediate part can be uniformly reinforced over the entire circumference thereof.
In the connector according to the sixth aspect of the present invention dependent on fifth aspect or the second aspect, the housing is configured such that the base part and the tip part are dividable from each other.
According to the connector of the present aspect, even with the constricted intermediate part, the reinforcing member can be attached to the intermediate part.
In the connector according to the seventh aspect of the present invention dependent on any one of the first aspect to the sixth aspect, the plurality of contact pins have, from a tip to a base end, a contact part configured to come into contact with the external module board, a press-fit part configured to be press-fitted into the housing and a mount part configured to be mounted on the external circuit board, and include a signal pin for signal transmission and a ground pin for grounding, and in the ground pin, a portion that is closer to the mount part than the press-fit part is branched into two portions.
According to the connector of the present aspect, so-called double ground in which a pair of ground pins are arranged between a pair of signal pins (differential pair) and another differential pair is formed, and crosstalk between differential pairs is thus reduced.
In the connector according to the eighth aspect of the present invention dependent on any one of the first aspect to the seventh aspect, the external module is a module having a protection wall for protecting the external module board, the protection wall is provided substantially parallel to the external module board, and the tip part includes a recess adapted to a shape of the protection wall.
According to the connector of the present aspect, it is possible to prevent the connector from interfering with the protection wall when the external module has been inserted into the connector.
Connectors according to a first embodiment and a second embodiment of the present invention will be described below with reference to the drawings.
Note that an insertion-extraction direction Die, a depth direction Dd, a width direction Dw, and a height direction Dh used in the following description are intended to assist in understanding the description and based on
Further, when the direction in which an optical module is inserted/extracted is defined as the insertion-extraction direction Die (first direction), the depth direction Dd matches the insertion-extraction direction Die, the width direction Dw (second direction) is orthogonal to the depth direction Dd, and the height direction Dh (third direction) is orthogonal to the depth direction Dd and the width direction Dw.
The connector according to the first embodiment of the present invention will be described with reference to the drawings.
As illustrated in
The optical module 10 is compatible to a form factor such as QSFP-DD or OSFP-DD.
As illustrated in
As illustrated in
These parts are arranged in the order of the base part 111, the intermediate part 112, and the tip part 113 from a circuit board 20 side along the depth direction Dd and integrally molded.
As illustrated in
As illustrated in
As illustrated in
The dimension in the height direction Dh of the tip part 113 (hereafter, referred to as “height dimension”) may be less than the height dimension of the base part 111. However, the dimension in the width direction Dw of the tip part 113 (hereafter, referred to as “width dimension”) may be substantially the same as the width dimension of the base part 111.
The intermediate part 112 is a portion between the base part 111 and the tip part 113 in the depth direction Dd.
Herein, the height dimension and the width dimension of the intermediate part 112 are defined as (1) or (2) below.
Even in any case of (1) or (2) described above, the outer housing 110 has a constricted shape of the height dimension and/or the width dimension in the intermediate part 112.
The dimension in the depth direction Dd of the intermediate part 112 (hereafter, referred to as “depth dimension”) is not particularly limited but is sufficiently less than the depth dimension of the base part 111 and the depth dimension of the tip part 113 in the case of the present embodiment. However, the depth dimension is large enough to attach the frame 170 or the like described later thereto.
As illustrated in
As illustrated in
The second pin group 130 has a plurality of contact pins aligned in the width direction Dw. Signal pins 131 and ground pins 132 are included in the plurality of contact pins.
The first pin group 120 and the second pin group 130 are arranged facing each other with a predetermined spacing therebetween in the height direction Dh.
As illustrated in
The contact part 121a is a portion that comes into contact with an electrode of the module board 11, and the contact part 121a includes a top that is convex toward the center.
The press-fit part 121b is a portion press-fitted into the outer housing 110 and includes a plurality of protrusions projecting in the width direction Dw (see
The mount part 121c is a portion connected to an electrode of the circuit board 20.
The ground pin 122 also has a contact part 122a, a press-fit part 122b, and a mount part 122c in the same manner as the signal pin 121.
The signal pin 131 also has a contact part 131a, a press-fit part 131b, and a mount part 131c in the same manner as the signal pin 121.
The ground pin 132 also has a contact part 132a, a press-fit part 132b, and a mount part 132c in the same manner as the signal pin 121.
As illustrated in
The plurality of grooves 116 corresponding to each pin group extend in the depth direction Dd and are arranged at a predetermined pitch in the width direction Dw. Further, the plurality of grooves 116 corresponding to the first pin group 120 face the plurality of grooves 116 corresponding to the second pin group 130 in the height direction Dh while being shifted by half a pitch in the width direction Dw.
As illustrated in
As illustrated in
As illustrated in
The fourth pin group 160 has a plurality of contact pins aligned in the width direction Dw. Signal pins 161 and ground pins 162 are included in the plurality of contact pins. The plurality of contact pins are shorter than contact pins of the first pin group 120 and the second pin group 130.
The third pin group 150 and the fourth pin group 160 are arranged facing each other with a predetermined spacing therebetween in the height direction Dh.
As illustrated in
The contact part 151a is a portion that comes into contact with an electrode of the module board 11, and the contact part 151a includes a top that is convex towards the center.
The press-fit part 151b is a portion press-fitted into the inner housing 140 and includes a plurality of protrusions projecting in the width direction Dw (see
The mount part 151c is a portion connected to an electrode of the circuit board 20.
The ground pin 152 also has a contact part 152a, a press-fit part 152b, and a mount part 152c in the same manner as the signal pin 151.
The signal pin 161 also has a contact part 161a, a press-fit part 161b, and a mount part 161c in the same manner as the signal pin 151.
The ground pin 162 also has a contact part 162a, a press-fit part 162b, and a mount part 162c in the same manner as the signal pin 151.
As illustrated in
The plurality of grooves 146 corresponding to each pin group extend in the depth direction Dd and are arranged at a predetermined pitch in the width direction Dw. Further, the plurality of grooves 146 corresponding to the third pin group 150 face the plurality of grooves 146 corresponding to the fourth pin group 160 in the height direction Dh while being shifted by half a pitch in the width direction Dw.
As illustrated in
In this state, the contact part 121a and the contact part 131a facing each other and the contact part 122a and the contact part 132a facing each other are at positions that are closer to the slot opening 113a in the depth direction Dd than the contact part 151a and the contact part 161a facing each other and the contact part 152a and the contact part 162a facing each other. Further, the mount part 121c, the mount part 122c, the mount part 131c, and the mount part 132c are at the same position in the depth direction Dd as the mount part 151c, the mount part 152c, the mount part 161c, and the mount part 162c.
As illustrated in
The frame 170 is an annular plate that surrounds the intermediate part 112 of the outer housing 110 and is in contact with the entire circumference of the intermediate part 112. In the case of the present embodiment, since the external shape of a cross-section of the intermediate part 112 (a cross-section in a face orthogonal to the depth direction Dd) is rectangular, the frame 170 is an annular plate having four sides.
The frame 170 preferably has higher rigidity than the outer housing 110 and is made of a metal, for example.
As illustrated in
The main body 171 is a portion forming three sides of the four sides and has a substantially U-shape. On the other hand, the divided piece 172 is a portion forming the remaining one side.
The frame 170 is formed in an annular shape having four sides by two ends of the divided piece 172 being connected to two ends of the main body 171. Example of methods for connecting the divided pieces 172 to the main body 171 may be fitting, press-fitting, crimping, or the like.
As illustrated in
That is, the second frame 180 is an annular plate having a second main body 181 and a second divided piece 182.
The frame 170 configured as described above is attached to the intermediate part 112 of the outer housing 110 as follows.
First, as illustrated in
Next, as illustrated in
Next, as illustrated in
Next, as illustrated in
In this state, the dimensions of the frame 170 in the height direction Dh and the width direction Dw are approximately the same as the dimensions of the stepped face 111b of the base part 111 in the height direction Dh and the width direction Dw.
The same applies to the dimensions of the second frame 180.
The connector 100 configured as described above achieves the following advantageous effects.
As illustrated in
Accordingly, as illustrated in
Further, because of the constricted intermediate part 112 to which the frame 170 and the second frame 180 are attached, the inner dimensions of the frame 170 and the second frame 180 can be increased. This can improve the rigidity (section modulus) of the frame 170 and the second frame 180.
Note that the rigidity may be improved by increase of the outer dimensions of the frame 170 and the second frame 180, but in such a case, the connector 100 becomes larger. Further, when the dimension of each part of the connector 100 is determined by standards, it is not possible to increase the outer dimensions of the frame 170 and the second frame 180 in some cases in the first place.
Further, even with the constricted intermediate part 112 of the outer housing 110 in which the base part 111, the intermediate part 112, and the tip part 113 are integrated, since the frame 170 is configured to be dividable, the frame 170 can be attached to the intermediate part 112 by taking a step of inserting the main body 171 onto the intermediate part 112 and then connecting the divided piece 172 to the main body 171.
The same applies to the second frame 180.
Herein, the second frame 180 is not an essential component, and the connector 100 may have only the frame 170 attached as a reinforcing member.
Further, other frames (third frame, fourth frame . . . ) having the same configuration as the frame 170 and the second frame 180 may be attached to the connector 100.
The second divided piece 182 is preferably arranged at a position (side) facing the divided piece 172 when viewed in the depth direction Dd. In the case of
With such arrangement, the divided piece 172 and the second main body 181 overlap each other, the second divided piece 182 and the main body 171 overlap each other, and the divided piece 172 and the second divided piece 182 do not overlap each other.
Accordingly, since a connection portion between the main body 171 and the divided piece 172 whose strength may be inferior to other portions and a connection portion between the second main body 181 and the second divided piece 182 whose strength may be inferior to other portions are arranged alternately (that is, it is avoided that two connection portions are arranged only on one side of the intermediate part 112), the intermediate part 112 can be uniformly reinforced over the entire circumference thereof.
As illustrated in
Because the ground pin is branched in such a way, the first branch part 122x and the second branch part 122y and also the first branch part 132x and the second branch part 132y can be regarded as a single ground pin, and this is equivalent to that the contact pins in the region closer to the base ends than the press-fit part 121b and press-fit part 131b are arranged as with G-G-S-S-G-G-S-S-G-G- . . . -S-S-G-G.
Herein, “G” represents the ground pin, and “S” represents the signal pin.
Accordingly, the first pin group 120 and the second pin group 130 form so-called double ground, in which a pair of ground pins are arranged between a pair of signal pins (differential pair) and another differential pair, and crosstalk between differential pairs is thus reduced.
Further, as illustrated in
Note that only a pair of the first pin group 120 and the second pin group 130 may be double ground as described above, only a pair of the third pin group 150 and the fourth pin group 160 may be double ground as described above, or all the pin groups of the first pin group 120 to the fourth pin group 160 may be double ground as described above.
As illustrated in
The protection wall 12 is a plate-like portion for protecting the underside of the module board 11 and is provided substantially parallel to the module board 11.
As illustrated in
The recess 113b is a portion recessed (a portion whose thickness is reduced) so as to prevent the connector 100 from interfering with the protection wall 12 when the optical module 10 has been inserted into the connector 100. Therefore, the shape of the recess 113b is adapted to the shape of the protection wall 12.
A connector according to the second embodiment of the present invention will be described with reference to the drawings.
Note that the present embodiment differs from the first embodiment in the form of the outer housing and the frame and is the same in other respects. Thus, the outer housing and the frame will be mainly described here.
As illustrated in
Herein, the intermediate part 112 may be integrally molded on the top of the base part 111 or may be integrally molded on the bottom of the tip part 113. Further, a part of the intermediate part 112 may be integrally molded on the top of the base part 111 and the remaining portion of the intermediate part 112 may be integrally molded on the bottom of the tip part 113.
A frame 190 is an annular plate having four sides in the same manner as the frame 170 or the like.
However, the frame 190 is not configured to be dividable, and the four sides thereof are integrated.
The frame 190 configured as described above is attached to the outer housing 110′ as follows.
First, the frame 190 is arranged between the base part 111 and the tip part 113 separated from each other.
Next, the tip part 113 is attached to the base part 111. In this state, the intermediate part 112 is fitted inside the frame 190. Accordingly, the frame 190 is attached to the intermediate part 112 in a form of being overlapped on the stepped face 111b of the base part 111.
The connector 100 configured as described above achieves the following advantageous effects.
The frame 190 is attached to the intermediate part 112 of the outer housing 110′, thereby the outer housing 110′ is reinforced, and deformation of the outer housing 110′ is thus suppressed. Further, since the deformation of the outer housing 110′ is suppressed, the contact pressure of the contact pins against the electrode of the module board 11 can be suitably maintained. Thus, good signal transmission characteristics can be realized up to a high-frequency range.
Further, because of the constricted intermediate part 112 to which the frame 190 is attached, the inner dimensions of the frame 170 and the second frame 180 can be increased.
This can improve the rigidity (section modulus) of the frame 190.
Note that the rigidity may be improved by increase of the outer dimensions of the frame 190, but in such a case, the connector 100 becomes larger. Further, when the dimension of each part of the connector 100 is determined by standards, it is not possible to increase the outer dimensions of the frame 190 in the first place.
Further, even with the constricted intermediate part 112, since the outer housing 110′ is configured such that the base part 111 and tip part 113 are dividable from each other, the frame 190 can be attached to the intermediate part 112 by arranging the frame 190 between the separated base part 111 and tip part 113 in advance and taking a step of fitting the intermediate part 112 inside the frame 190 when attaching the tip part 113 to the base part 111.