CN118281649A - Electromagnetic shield cover and electromagnetic shield structure suitable for surface-mounted connector - Google Patents
Electromagnetic shield cover and electromagnetic shield structure suitable for surface-mounted connector Download PDFInfo
- Publication number
- CN118281649A CN118281649A CN202410711444.XA CN202410711444A CN118281649A CN 118281649 A CN118281649 A CN 118281649A CN 202410711444 A CN202410711444 A CN 202410711444A CN 118281649 A CN118281649 A CN 118281649A
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- electromagnetic shielding
- connector
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- top plate
- mounted connector
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- 230000005855 radiation Effects 0.000 claims abstract description 18
- 230000002093 peripheral effect Effects 0.000 claims abstract description 8
- 239000007769 metal material Substances 0.000 claims description 11
- 229910000906 Bronze Inorganic materials 0.000 claims description 10
- 239000010974 bronze Substances 0.000 claims description 10
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 claims description 10
- 229910000617 Mangalloy Inorganic materials 0.000 claims description 5
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 5
- 229910052790 beryllium Inorganic materials 0.000 claims description 5
- ATBAMAFKBVZNFJ-UHFFFAOYSA-N beryllium atom Chemical compound [Be] ATBAMAFKBVZNFJ-UHFFFAOYSA-N 0.000 claims description 5
- 230000000149 penetrating effect Effects 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 abstract description 4
- 229910052751 metal Inorganic materials 0.000 abstract description 4
- 230000000694 effects Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 3
- 235000017491 Bambusa tulda Nutrition 0.000 description 3
- 241001330002 Bambuseae Species 0.000 description 3
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 3
- 239000011425 bamboo Substances 0.000 description 3
- 238000002955 isolation Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Landscapes
- Details Of Connecting Devices For Male And Female Coupling (AREA)
- Shielding Devices Or Components To Electric Or Magnetic Fields (AREA)
Abstract
The invention discloses an electromagnetic shielding cover and an electromagnetic shielding structure suitable for a surface-mounted connector, which belong to the technical field of electromagnetic shielding, wherein when a cable connector is inserted with the surface-mounted connector, the electromagnetic shielding cover is arranged in a shell, the bottom end of a coaming is contacted with the surface of a circuit printed board, the surface-mounted connector passes through a circular opening, and the elastic characteristics of elastic metal are utilized to form tension so that arc-shaped latch teeth on the electromagnetic shielding cover are stretched to be tightly attached to the peripheral surface of the surface-mounted connector, so that the electromagnetic shielding cover is arranged on the outer side of the surface-mounted connector, and a radiation source at the joint of the surface-mounted connector and the circuit printed board is covered in a containing space by the electromagnetic shielding cover, so that electromagnetic signals at the radiation source are prevented from radiating outwards through a through hole of the shell.
Description
Technical Field
The invention belongs to the technical field of electromagnetic shielding, and particularly relates to an electromagnetic shielding cover and an electromagnetic shielding structure suitable for a surface-mounted connector.
Background
Many electronic devices exist that include a circuit printed board (such as a microstrip circuit printed board) and a housing for enclosing the circuit printed board inside. When the circuit printed board is connected with the electronic equipment outside the shell, the surface-mounted connector is welded on the circuit printed board (the discontinuity of the welded connection part of the surface-mounted connector and the circuit printed board can form a radiation source), and the shell corresponding to the surface-mounted connector is provided with a through hole, so that the surface-mounted connector inside the shell is connected with the cable connector outside after extending out of the through hole.
However, in order to facilitate the penetrating of the surface-mounted connector, the outer diameter of the surface-mounted connector is generally smaller than the aperture of the through hole on the housing, and a gap is formed between the surface-mounted connector and the through hole, so that the electromagnetic signal at the radiation source leaks from the gap.
Disclosure of Invention
In view of the above, the present invention provides an electromagnetic shielding cover and an electromagnetic shielding structure suitable for a surface mount connector, where the electromagnetic shielding cover can effectively prevent electromagnetic signals at a radiation source from leaking outwards through a through hole of a housing.
The electromagnetic shielding cover suitable for the surface-mounted connector adopts the following specific technical scheme:
an electromagnetic shielding cover suitable for a surface-mounted connector is made of elastic metal materials and comprises a top plate, a coaming and a plurality of arc-shaped clamping teeth;
the top plate is provided with a circular opening for penetrating the surface mount connector;
The coaming is of a cylindrical structure with two open ends; the top end of the coaming is fixedly and hermetically connected to the edge of the bottom surface of the top plate, and a containing space is formed between the top plate and the coaming; the bottom end of the coaming is used for contacting with the surface of the circuit printed board, and the radiation source at the joint of the surface-mounted connector and the circuit printed board is covered in the accommodating space;
The plurality of arc-shaped latches are arranged along the circumferential edge of the circular opening, and extend towards the direction away from the top surface of the top plate; a gap is arranged between two adjacent arc-shaped latches along the circumferential direction of the circular opening; the inner surface of the arc-shaped latch of the circumference of the circular opening is used for being attached to the outer circumferential surface of the surface-mounted connector.
Further, the top plate, the coaming and the plurality of arc-shaped latches are of an integrated structure.
Still further, the coaming and the arcuate latch are both welded to the top plate.
Further, the top plate is a circular plate, a rectangular plate or a polygonal plate;
The elastic metal material is beryllium bronze, phosphor bronze or manganese steel.
Still further, the circular opening has an inner diameter of 4mm to 7mm;
the width of the gap is 0.1mm-0.3mm;
the height of the arc-shaped latch is 1mm-3mm;
the number of the arc-shaped latches circumferentially arranged on each circular opening is 6-20.
The beneficial effects are that:
1. the electromagnetic shielding cover is made of elastic metal material and comprises a top plate, a coaming and a plurality of arc-shaped latches; the top plate is provided with a circular opening for penetrating the surface mount connector; the coaming is a cylindrical structure with two open ends; the top end of the coaming is fixedly connected to the edge of the bottom surface of the top plate, and a containing space is formed between the top plate and the coaming; the bottom end of the coaming is used for contacting with the surface of the circuit printed board, and the radiation source at the joint of the surface-mounted connector and the circuit printed board is covered in the accommodating space; the plurality of arc-shaped latches are arranged along the circumferential edge of the circular opening, and extend towards the direction away from the top surface of the top plate; a gap is arranged between two adjacent arc-shaped latches along the circumferential direction of the circular opening; the inner surfaces of the plurality of arc-shaped latches are used for being attached to the outer peripheral surface of the surface-mount connector.
Thus, when the cable connector is inserted with the surface-mounted connector, the electromagnetic shielding cover is arranged in the space covered by the shell, the bottom end of the coaming is contacted with the surface of the circuit printed board, the surface-mounted connector passes through the circular opening, the elastic characteristics of elastic metal are utilized to form tension so that the arc-shaped clamping teeth are spread and tightly attached to the outer peripheral surface of the surface-mounted connector, the electromagnetic shielding cover is arranged on the outer side of the surface-mounted connector, the radiation source at the joint of the surface-mounted connector and the circuit printed board is covered in the accommodating space by the electromagnetic shielding cover, and electromagnetic signals at the radiation source are prevented from radiating outwards through the through hole of the shell.
2. The top plate, the coaming and the plurality of arc-shaped latches of the electromagnetic shielding cover can be of an integrated structure, and can be formed by one-step stamping of the elastic metal plate, so that the preparation process is simple and quick, the electromagnetic shielding cover has the characteristics of easy and quick preparation, and the electromagnetic shielding cover can be quickly installed in electronic equipment.
3. Because the roof can be circular plate, rectangular plate, or polygon board, correspondingly, when the roof is circular plate, rectangular plate, polygon board respectively, the bounding wall corresponds for cylinder, rectangle section of thick bamboo, polygon section of thick bamboo for this electromagnetic shield cover can be according to the shape selection suitable electromagnetic shield cover of table subsides connector, has the nimble characteristics of use.
4. Because the electromagnetic shielding cover is made of beryllium bronze, phosphor bronze or manganese steel material, the beryllium bronze, phosphor bronze or manganese steel material has high elasticity, so that the electromagnetic shielding cover can be elastically deformed and always has the tendency of restoring deformation under the action of elasticity, the arc-shaped latch can be guaranteed to be tightly attached to the outer surface of the surface-mounted connector, and the electromagnetic shielding effect is further improved.
5. Two electromagnetic shielding covers are arranged, one electromagnetic shielding cover is coaxially sleeved on the outer side of the other electromagnetic shielding cover, the bottom ends of coamings of the two electromagnetic shielding covers are contacted with the surface of a circuit printed board, the inner surfaces of arc-shaped clamping teeth of the two electromagnetic shielding covers are attached to the outer peripheral surface of a surface-mounted connector, and a radiation source at the joint of the surface-mounted connector and the circuit printed board is covered in a containing space of the electromagnetic shielding cover on the inner side; the gaps on the two electromagnetic shielding covers are distributed in a staggered way.
Thus, the electromagnetic signal leaked from the gap can be reduced, and the electromagnetic shielding effect is further improved.
Drawings
Fig. 1 is a schematic view showing a state of the electromagnetic shield of the present invention after being mounted to an electronic device;
FIG. 2 is a cross-sectional view of the assembled structure of FIG. 1;
FIG. 3 is a top view of the assembled structure of FIG. 1;
fig. 4 is a schematic perspective view of an electromagnetic shielding case according to the present invention;
fig. 5 is a schematic perspective view of another electromagnetic shielding cover provided by the invention;
Fig. 6 is a schematic perspective view of another electromagnetic shielding cover provided by the invention;
Fig. 7 is a schematic perspective view of another electromagnetic shielding cover provided by the invention;
FIG. 8 is a graph of isolation test results without the electromagnetic shield provided by the present invention;
FIG. 9 is a graph of isolation test results using the electromagnetic shield provided by the present invention;
The cable connector comprises a 1-cable connector, a 2-connecting part, a 3-shell, a 4-electromagnetic shielding cover, a 5-surface-mount connector, a 6-circuit printed board, 7-arc-shaped latches, 8-round through holes, 9-top plates, 10-coamings and 11-gaps.
Detailed Description
The invention will now be described in detail by way of example with reference to the accompanying drawings.
Embodiment one:
The embodiment of the invention provides an electromagnetic shielding cover 4 suitable for a surface-mounted connector 5.
As shown in the structures of fig. 1, 2 and 3, the cable connector 1 of the electronic device is located outside the housing 3, a circuit printed board 6 is disposed inside the housing 3, a surface mount connector 5 is welded on the circuit printed board 6 (discontinuity at the connection position of the surface mount connector 5 and the circuit printed board 6 forms a radiation source), the housing 3 is provided with a circular through hole 8 opposite to the surface mount connector 5, the surface mount connector 5 is inserted into the cable connector 1 after passing through the circular through hole 8 (when the surface mount connector 5 is inserted into the cable connector 1, the surface mount connector 5 corresponds to a socket, the cable connector 1 corresponds to a plug, and the cable connector 1 is inserted into the surface mount connector 5, and the part of the cable connector 1, which is inserted into the surface mount connector 5, is the connecting part 2). The electromagnetic shield 4 according to the present embodiment can be attached to the inside of the space covered by the housing 3 of the electronic device.
As shown in the structure of fig. 1 to 7, in the present embodiment, the electromagnetic shield 4 is made of an elastic metal material; the electromagnetic shielding cover 4 comprises a top plate 9, a coaming 10 and a plurality of arc-shaped clamping teeth 7; the top plate 9 is provided with a circular opening for penetrating the surface mount connector 5, and the circular opening can be arranged at the center of the top plate 9 or eccentrically; the coaming 10 is of a cylindrical structure with two open ends, so that the cross section of the coaming 10 is the same as the shape and the size of the top plate 9; the top end of the coaming 10 is fixedly and hermetically connected with the edge of the bottom surface of the top plate 9, and a containing space is formed between the top plate 9 and the coaming 10; the bottom end of the coaming 10 is used for contacting with the surface of the circuit printed board 6, and the radiation source formed at the joint of the surface-mounted connector 5 and the circuit printed board 6 is covered in the accommodating space; a plurality of arc-shaped latches 7 are arranged along the circumferential edge of the circular opening, and the arc-shaped latches 7 extend in a direction away from the top surface of the top plate 9; a gap 11 is arranged between two adjacent arc-shaped latches 7 along the circumferential direction of the circular opening; the inner surface of the arc-shaped latch 7 in the circumferential direction of the circular opening is used for being attached to the outer circumferential surface of the surface-mounted connector 5.
It should be noted that since "elastic metal material" is not a strict term of art, it is generally used to describe a class of metal materials having good elastic properties. Such materials are capable of deforming when subjected to an external force and, when the external force is removed, they return to their original shape and size, i.e. exhibit good elasticity. Therefore, the elastic metal material in the present embodiment refers to a metal material having the following properties: can deform when being acted by external force, and has the tendency of returning to the original shape and size after the external force is removed.
Specifically, in this embodiment, the electromagnetic shielding cover 4 may be made of an elastic metal material with high elasticity, such as beryllium bronze, phosphor bronze, or manganese steel, so that the electromagnetic shielding cover 4 may be elastically deformed and always has a tendency of recovering deformation under the action of elasticity, so that the arc latch 7 is always tightly attached to the outer surface of the surface mount connector 5, and the electromagnetic shielding effect is improved.
Specifically, in the present embodiment, the arcuate latch teeth 7 of the circumferential edge of each circular opening 8 are uniformly distributed; the top plate 9, the coaming 10 and the plurality of arc-shaped latches 7 can be of an integrated structure, or the top plate 9, the coaming 10 and the plurality of arc-shaped latches 7 can also be of a split structure, and the coaming 10 and the arc-shaped latches 7 are welded and connected to the top plate 9. In this embodiment, the top plate 9, the coaming 10 and the plurality of arc-shaped latches 7 of the electromagnetic shielding case 4 are made into an integrated structure, and the electromagnetic shielding case 4 is made by one-step stamping and forming of an elastic metal plate, so that the preparation process is simple and quick, the electromagnetic shielding case 4 has the characteristics of easy and quick preparation, and the electromagnetic shielding case 4 can be quickly installed in an electronic device.
More specifically, the top plate 9 may be a circular plate, a rectangular plate, or a polygonal plate; because roof 9 can be circular plate, rectangular plate, or polygon board, correspondingly, when roof 9 is circular plate, rectangular plate, polygon board respectively, bounding wall 10 corresponds to be cylinder, rectangular cylinder, polygon section of thick bamboo, can select suitable electromagnetic shield 4 according to the shape of table subsides connector 5, has the nimble characteristics of use. As shown in the structure of fig. 4, the top plate 9 is a rectangular plate, and the coaming 10 is a rectangular cylinder structure matched with the rectangular top plate 9 in shape; as shown in the structures of fig. 5 and 7, the top plate 9 is a hexagonal plate, and the coaming 10 is a hexagonal cylinder structure matched with the hexagonal top plate 9 in shape; as shown in the structure of fig. 6, the top plate 9 is a regular octagonal plate, and the coaming 10 is a regular octagonal cylinder structure matched with the regular octagonal top plate 9 in shape; fig. 4-6 are only examples of parts, and other shapes of the top plate 9 and the coaming 10 are possible.
In this embodiment, the inner diameter of the circular opening may be 4mm-7mm, such as: 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 6mm, 6.5mm, 7mm; the width of the slit 11 may be 0.1mm to 0.3mm, such as: 0.1mm, 0.15mm, 0.2mm, 0.25mm, 0.3mm; the height of the arc-shaped latch 7 may be 1mm-3mm, such as: 1mm, 1.2mm, 1.5mm, 1.8mm, 2mm, 2.5mm, 3mm; the quantity of the arc-shaped clamping teeth 7 evenly distributed in the circumferential direction of each circular opening 8 can be flexibly set, for example, the quantity of the arc-shaped clamping teeth 7 can be 6-20, for example: 6, 8, 9, 10, 12, 15, 16, 18, 20.
Embodiment two:
on the basis of the first embodiment, the present embodiment provides a shielding structure suitable for a surface mount connector.
Referring to fig. 1, 2 and 3, an electromagnetic shield 4 is disposed inside a housing 3 of an electronic device, a bottom end of a surrounding board 10 of the electromagnetic shield 4 contacts a surface of a circuit printed board 6, a radiation source at a connection part of a surface mount connector 5 and the circuit printed board 6 is covered in a containing space, and an inner surface of an arc latch 7 is attached to an outer peripheral surface of the surface mount connector 5.
When the electromagnetic shielding cover 4 is not arranged in the prior art, the specific leakage test result is shown in fig. 8, the leakage test result when one electromagnetic shielding cover 4 is arranged in the invention is shown in fig. 9, the actual test result is shown in fig. 9, and the comparison is carried out according to fig. 8 and 9, and by additionally arranging the electromagnetic shielding cover 4, the leakage between the two adjacent channels is improved by about 15dB, so that the problem of channel isolation in circuit design is effectively solved, the leakage of electromagnetic signals at the radiation source formed at the joint of the surface-mounted connector 5 and the circuit printed board 6 is effectively prevented, the mutual crosstalk of signals between the multi-channel circuits is avoided, and the problem of electromagnetic compatibility of the module is also effectively solved.
In addition, it should be noted that, because the electromagnetic shielding cover 4 in the present invention is provided with the slit 11, a small amount of electromagnetic signals leaks from the slit 11, but in general, the leakage amount is negligible, if the shielding effect is to be further improved, two electromagnetic shielding covers 4 with the same structure may be provided, one electromagnetic shielding cover 4 is coaxially sleeved on the outer side of the other electromagnetic shielding cover 4, the bottom ends of the coamings 10 of the two electromagnetic shielding covers 4 are both in contact with the surface of the circuit printed board 6, the inner surfaces of the arc-shaped latches 7 of the two electromagnetic shielding covers 4 are both attached to the outer peripheral surface of the surface-mounted connector 5, and the radiation source at the junction of the surface-mounted connector 5 and the circuit printed board 6 is covered in the accommodating space of the inner electromagnetic shielding cover 4, in particular, the slits 11 on the two electromagnetic shielding covers are staggered (i.e. the angles of the circumferential distribution of the slits 11 on the two electromagnetic shielding covers 4 are different). Thus, the amount of leakage of electromagnetic signals from the slit 11 can be reduced, and the effect of further improving electromagnetic shielding can be achieved.
In summary, the above embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. An electromagnetic shielding cover suitable for a surface-mounted connector is characterized in that the electromagnetic shielding cover is made of elastic metal materials and comprises a top plate, a coaming and a plurality of arc-shaped latches;
the top plate is provided with a circular opening for penetrating the surface mount connector;
The coaming is of a cylindrical structure with two open ends; the top end of the coaming is fixedly and hermetically connected to the edge of the bottom surface of the top plate, and a containing space is formed between the top plate and the coaming; the bottom end of the coaming is used for contacting with the surface of the circuit printed board, and a radiation source formed at the joint of the surface-mounted connector and the circuit printed board is covered in the accommodating space;
The plurality of arc-shaped latches are arranged along the circumferential edge of the circular opening, and extend towards the direction away from the top surface of the top plate; a gap is arranged between two adjacent arc-shaped latches along the circumferential direction of the circular opening; the inner surface of the arc-shaped latch of the circumference of the circular opening is used for being attached to the outer circumferential surface of the surface-mounted connector.
2. The electromagnetic shield for a surface mount connector as set forth in claim 1, wherein said top plate, said shroud and said arcuate latch are of unitary construction.
3. The electromagnetic shield for a surface mount connector as set forth in claim 1, wherein said shroud and said arcuate latch are both welded to said top plate.
4. The electromagnetic shield for a surface mount connector as set forth in claim 1, wherein the top plate is a circular plate, a rectangular plate, or a polygonal plate.
5. The electromagnetic shield for a surface mount connector as set forth in claim 1, wherein the metallic material is beryllium bronze, phosphor bronze, or manganese steel.
6. The electromagnetic shield for a surface mount connector as set forth in any one of claims 1-5, wherein the circular opening has an inner diameter of 4mm to 7mm;
the width of the gap is 0.1mm-0.3mm;
the height of the arc-shaped latch is 1mm-3mm;
the number of the arc-shaped latches circumferentially arranged on each circular opening is 6-20.
7. A shielding structure suitable for a surface mount connector, using the electromagnetic shield cover suitable for a surface mount connector according to any one of claims 1 to 6, characterized in that:
the electromagnetic shielding cover is arranged on the inner side of the shell of the electronic equipment;
the bottom end of the coaming is contacted with the surface of the circuit printed board, and the radiation source at the joint of the surface-mounted connector and the circuit printed board is covered in the accommodating space;
the inner surface of the arc latch is attached to the outer peripheral surface of the surface-mount connector.
8. A shielding structure for a surface mount connector as set forth in claim 7, wherein:
The electromagnetic shielding covers suitable for the surface-mounted connector are arranged, the number of the electromagnetic shielding covers is two, one electromagnetic shielding cover is coaxially sleeved on the outer side of the other electromagnetic shielding cover, the bottom ends of coamings of the two electromagnetic shielding covers are contacted with the surface of a circuit printed board, the inner surfaces of arc-shaped clamping teeth of the two electromagnetic shielding covers are attached to the outer peripheral surface of the surface-mounted connector, and a radiation source cover at the joint of the surface-mounted connector and the circuit printed board is arranged in a containing space of the electromagnetic shielding cover on the inner side;
the gaps on the two electromagnetic shielding covers are distributed in a staggered way.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410711444.XA CN118281649A (en) | 2024-06-04 | 2024-06-04 | Electromagnetic shield cover and electromagnetic shield structure suitable for surface-mounted connector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410711444.XA CN118281649A (en) | 2024-06-04 | 2024-06-04 | Electromagnetic shield cover and electromagnetic shield structure suitable for surface-mounted connector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118281649A true CN118281649A (en) | 2024-07-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202410711444.XA Pending CN118281649A (en) | 2024-06-04 | 2024-06-04 | Electromagnetic shield cover and electromagnetic shield structure suitable for surface-mounted connector |
Country Status (1)
| Country | Link |
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| CN (1) | CN118281649A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128882A (en) * | 2016-06-30 | 2016-11-16 | 平高集团有限公司 | Chopper and fingertip assembly, fingertip, contact finger piece |
| CN107565246A (en) * | 2016-07-01 | 2018-01-09 | 星电株式会社 | Connector modules and the onboard camera using the connector modules |
| CN212935027U (en) * | 2020-03-30 | 2021-04-09 | 上海莫仕连接器有限公司 | Electric connecting device and connector thereof |
-
2024
- 2024-06-04 CN CN202410711444.XA patent/CN118281649A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106128882A (en) * | 2016-06-30 | 2016-11-16 | 平高集团有限公司 | Chopper and fingertip assembly, fingertip, contact finger piece |
| CN107565246A (en) * | 2016-07-01 | 2018-01-09 | 星电株式会社 | Connector modules and the onboard camera using the connector modules |
| CN212935027U (en) * | 2020-03-30 | 2021-04-09 | 上海莫仕连接器有限公司 | Electric connecting device and connector thereof |
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