CN110459894A - A kind of contact and the connector using the contact - Google Patents
A kind of contact and the connector using the contact Download PDFInfo
- Publication number
- CN110459894A CN110459894A CN201811571626.2A CN201811571626A CN110459894A CN 110459894 A CN110459894 A CN 110459894A CN 201811571626 A CN201811571626 A CN 201811571626A CN 110459894 A CN110459894 A CN 110459894A
- Authority
- CN
- China
- Prior art keywords
- contact
- arm
- heel row
- contact arm
- mating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
- H01R13/02—Contact members
- H01R13/10—Sockets for co-operation with pins or blades
- H01R13/11—Resilient sockets
Landscapes
- Coupling Device And Connection With Printed Circuit (AREA)
Abstract
The present invention relates to a kind of contact and use the connector of the contact, contact includes the conductive fixed part with corresponding exit, front side will be defined as towards the side of mating contact, the front-seat contact arm and heel row contact arm for being arranged in described mating contact the same side are provided projectingly on conductive fixed part, two rows of contact arms vertically extend, the front side of front-seat contact arm has the first contact for contacting with the mating contact, the front side of heel row contact arm has the second contact for contacting with the mating contact, first contact and the second contact are staggeredly arranged.The contact site on same circuit can effectively be increased, when by its application on the connectors, the through-current capability of connector can be effectively improved under the premise of not increasing connector volume excessively, meeting temperature increase requirement.
Description
Technical field
The present invention relates to a kind of contact and use the connector of the contact.
Background technique
The structure of contact is as shown in Figure 1, be chip-type contact, including intermediate conductive fixed part in existing connector
100, conductive fixed part is plate-sheet-type structure, and the protrusion of conductive fixed part one end one is extended with multiple successively spaced apart connect
Contact arm 101, contact arm are slice structure, and the protrusion of the other end one of conductive fixed part is extended with multiple contact pins 103,
It can be used for being conductively connected with corresponding printed board, in use, chip-type contact is fixedly mounted in the connectors, relative spacing arrangement
Two-piece type contact constitute a contact pair, belong to any one contact in two contacts an of contact pair
The relative inner of contact arm has for the contact portion 102 with mating contact conductive contact, and relative inner herein refers to
Belong to the opposite sides of two contacts an of contact pair.Contact piece structure also is as shown in Fig. 2, i.e. application publication number is
Chip-type contact disclosed in the Chinese invention patent application of CN10714305A, including conductive fixed part, the conduction fixed part
For U-shaped frame 200, there are two the crossbeam extended parallel, two crossbeam time intervals arrangement, one end point of each crossbeam for the tool of U-shaped frame 200
One is not outstanding is extended with conductive sheet 202, and then one is outstanding respectively is extended with flake shape press mounting structure 201 for the other end, and two
The relative inner for the conductive sheet 202 that front and back is arranged on crossbeam is respectively provided with for the contact portion with mating contact conductive contact,
In fact, the contact portion on the conductive sheet that front and back is arranged herein forms socket, cooperate so that corresponding mating contact inserts.
With the development of communication field, the function and integrated level of communication apparatus are all continuously improved, and are connected to power supply
The requirement of device is also higher and higher, and to the through-current capacity in power connector unit area, higher requirements are also raised, and use is above-mentioned
Point is less, this just limits its through-current capability since it is contacted for the connector of two kinds of contacts.Existing product is not increasing excessively
Through-flow requirement has been unable to satisfy in the case where structure size.
Summary of the invention
The purpose of the present invention is to provide it is a kind of excessively increase corresponding connectors size in the case where effectively improve it is through-flow
The contact of ability；Meanwhile the present invention also provides a kind of connectors using above-mentioned contact.
To achieve the above object, the technical solution 1 of contact provided by the present invention is: a kind of contact, including has
The conductive fixed part of corresponding exit will be defined as front side, being provided projectingly on conductive fixed part towards the side of mating contact
There are the front-seat contact arm and heel row contact arm for being arranged in described mating contact the same side, two rows of contact arms are vertically square
To extension, the front side of front-seat contact arm has the first contact for contacting with the mating contact, before heel row contact arm
Side has the second contact for contacting with the mating contact, and the first contact and the second contact are staggeredly arranged.
The technical solution 2 of contact: advanced optimizing on the basis of scheme 1, limits front and rear row contact arm quantity, institute
Stating front-seat contact arm, arranged for interval has at least two in left-right direction, the heel row contact arm in left-right direction arranged for interval have to
It is two few.
The technical solution 3 of contact: advanced optimizing on the basis of scheme 2, limits the first contact in above-below direction
It is upper to be staggeredly arranged with the second contact.
The technical solution 4 of contact: advanced optimizing on the basis of scheme 3, the first contact and the second contact it is upper
Lower position, the first contact of each front row contact arm are located at the top of the second contact of each heel row contact arm.
The technical solution 5 of contact: advanced optimizing on the basis of scheme 4, the first touching of all front row contact arms
Point is aligned or is staggeredly arranged in the longitudinal direction, and the second contact of all heel row contact arms is aligned or is staggered in the longitudinal direction cloth
It sets.
The technical solution 6 of contact: advanced optimizing on the basis of scheme 3, and the front row contact arm is in front and back
Heel row contact arm arrangement described in upward face.
The technical solution 7 of contact: advanced optimizing on the basis of scheme 2, the first touching of the front row contact arm
Second contact of point and heel row contact arm is staggeredly arranged in the lateral direction.
The technical solution 8 of contact: advanced optimizing on the basis of scheme 7, and each front row contact arm and each heel row connect
Contact arm is successively alternately arranged in left-right direction.
The technical solution 9 of contact: advanced optimizing on the basis of scheme 8, first contact and the second contact
It is aligned or is staggeredly arranged in the up-down direction.
The technical solution of connector provided by the present invention using above-mentioned contact is: a kind of connector, including shell,
At least one flow increasing contact pair is equipped in shell, the flow increasing contact is to the shape with two contacts that relative spacing is distributed
At two contacts for belonging to the same flow increasing contact pair cooperatively form the socket being inserted into for corresponding mating contact, belong to same
At least one contact in two contacts of one flow increasing contact pair is using any in above-mentioned contact technical solution 1 to 9
Contact in scheme.
The technical solution of connector provided by the present invention using above-mentioned contact is: a kind of connector, including shell,
At least one flow increasing contact is equipped in shell, in shell in the front side of the flow increasing contact there are in connector grafting for phase
The grafting space for answering mating contact to be inserted into, the flow increasing contact is using either a program in above-mentioned contact technical solution 1 to 9
In contact.
The beneficial effects of the present invention are: on contact provided by the present invention, it is front-seat by being arranged on conductive fixed part
Contact arm and heel row contact arm are arranged the first contact in the front side towards mating contact of front-seat contact arm, contact in heel row
The second contact is arranged in the rear side towards mating contact of arm, and the first contact and the second contact are staggeredly arranged, and can have in this way
Effect increases the contact site on same circuit, when applying on the connectors it, can not excessively increase connector volume, expire
The through-current capability of connector is effectively improved under the premise of sufficient temperature increase requirement.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of chip-type contact in the prior art；
Fig. 2 is the structural schematic diagram of another chip-type contact in the prior art；
Fig. 3 is the structural schematic diagram of the embodiment 1 of contact provided by the present invention；
Fig. 4 is the structural schematic diagram of the embodiment 2 of contact provided by the present invention；
Fig. 5 is the structural schematic diagram of the embodiment 1 of connector provided by the present invention；
Fig. 6 is the main view of connector shown in Fig. 5；
Fig. 7 is A-A cross-sectional view in Fig. 6；
Fig. 8 is the structural schematic diagram of the embodiment 2 of connector provided by the present invention；
Fig. 9 is the top view of connector shown in Fig. 8；
Figure 10 is B-B cross-sectional view in Fig. 9.
Specific embodiment
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing, but is not limited thereto.
The embodiment 1 of contact provided by the present invention:
Contact piece structure in the embodiment is as shown in figure 3, the contact is used to form increasing with another contact when in use
Contact pair is flowed, the two contact relative spacings distribution of the same flow increasing contact pair is belonged to, cooperation is constituted for corresponding adaptation
The socket of contact insertion.
For convenience of description, the side of contact towards corresponding mating contact is defined as front side, connecing in the present embodiment
Contact element includes conductive fixed part 10, and conductive fixed part 10 is used to be fixedly mounted on contact is corresponding in the shell of connector,
Conductive fixed part herein is specially U-shaped structure comprising is spaced apart and extends parallel along the longitudinal direction in left-right direction
Two crossbeams, two crossbeams are the front beam positioned at front side and the rear cross beam positioned at rear side, and one end of two crossbeams is connected by intermediate vertical plate
It connects, two crossbeams herein are sheet structure, cooperate intermediate vertical plate, to form U-shaped structure.
In fact, the structure of above-mentioned conduction fixed part 10 can refer to the Chinese invention that application publication number is CN10714305A
It is in the crossbeam of frame-type structure on chip-type contact disclosed in patent application.
Corresponding exit 17 is equipped on conductive fixed part 10, exit is specially to be integrally disposed upon conductive fixed part upper end
Contact pin, can be used for being correspondingly connected with corresponding printed board.Certainly, in other embodiments, on conductive fixed part
Corresponding flake shape press mounting structure can also be used in exit, or other leading-out terminal structures that conductive extraction can be achieved.It leads
Exit on electric fixed part is multiple along being disposed with for two girder spaces.
The difference of contact provided by the present embodiment and existing contact essentially consists in: being arranged in the prominent part of on conductive fixed part
For being arranged in the front-seat contact arm 11 and heel row contact arm 16 of corresponding mating contact the same side, two rows of contact arms are vertically
Direction extends, in fact, the lower end that conductive fixed part 10 is set of two rows of contact arm one, specifically, front-seat contact arm
11 are integrally attached on front beam, and heel row contact arm 16 is then integrally attached on rear cross beam, and front-seat contact arm 11 is used for court
There is the first contact 12 for contacting with mating contact to the front side of mating contact, correspondingly, heel row contact arm 16
For then to there is the second contact 13 for contacting with mating contact towards the front side of the same mating contact, herein
One contact 12 and the second contact 13 are staggeredly arranged in the up-down direction, can effectively increase the contact portion with mating contact in this way
Position, and then improve the through-current capability of single contact.Compared with contact shown in FIG. 1, one times of contact is actually increased
Quantity reduces contact resistance, effectively increases through-current capability.
In fact, front-seat contact arm 11 is intervally distributed with 5 in left-right direction, and heel row contact arm 16 is then in left-right direction
Also arranged for interval has 5, and 5 front-seat contact arms 11 in the longitudinal direction arrange by 5 heel row contact arms 16 of face, moreover, no matter
It is front-seat contact arm or heel row contact arm, in the lateral direction, all there are the gaps of setting for two contact arm of arbitrary neighborhood, herein
Front-seat contact arm and heel row contact arm be en plaque structure.
In addition, the first contact 12 alignment in the longitudinal direction of all front row contact arms 11, all heel row contact arms
16 the second contact 13 also alignment in the longitudinal direction.Also, in the present embodiment, the first contact of each front row contact arm 11
12 be located at each heel row contact arm 16 the second contact 13 top so that the first contact 23 in the up-down direction with the second contact
13 are staggeredly arranged.
In fact, due to front-seat 11 face heel row contact arm 16 of contact arm, for convenience of heel row contact arm the second contact with
Corresponding mating contact contact, the length of front-seat contact arm 11 is less than the length of heel row contact arm 16, but also the first contact
12 are usually located at the top of the second contact 13.Certainly, if front-seat contact arm and heel row contact arm not face, can also make first
Contact is located at below the second contact, as long as front-seat contact arm dislocation is made to get out of the way corresponding second contact.
In addition, in the present embodiment, the first contact 12 of front-seat contact arm 11 successively alignment in the longitudinal direction, heel row
Second contact 13 of contact arm 16 also alignment in the longitudinal direction.In fact, in other embodiments, either front row connects
First contact 12 of contact arm 11 or the second contact 13 of heel row contact arm 16 can be staggeredly arranged in the longitudinal direction, such as
Inclination dislocation arrangement.
Moreover, at the first contact 12 of the front-seat contact arm 11 in the present embodiment and the second contact 13 of heel row contact arm 16
In in the same vertical plane vertically extended, so, heel row contact arm 16 has the preceding bending part 15 of forward fold,
So that the second contact can biased forwards to be in the same vertical plane with the first contact.
The contact as provided by the present embodiment cooperatively forms socket for contact corresponding with another, herein
Up and down direction be for corresponding mating contact insertion plugging direction, for convenience of mating contact insertion, either before
Contact arm or heel row contact arm are arranged, the rear bending part 14 bent backwards is all set in the lower end of contact arm, and the first contact is located at
The upper end of the rear bending part of front-seat contact arm, the second contact are then located at the preceding bending part of heel row contact arm and the transition of rear bending part
Junction.Certainly, this rear bending part is mainly used for that corresponding mating contact is guided to assemble, in other embodiments, can also
To save the structure of rear bending part, corresponding chamfering or rounded structure can be designed to guide inserting.
It should be strongly noted that the conductive fixed part of contact is U-shaped structure, in other embodiments in the present embodiment
In, conductive fixed part may be block structure or rectangular frame structure, as long as being equipped with corresponding exit, and settable
Front-seat contact arm and heel row contact arm.Moreover, corresponding exit, front and rear row contact arm can integrally be rushed with conductive fixed part
Bending forming again is pressed, also or is assembled by the way of seperated weld connection using other integrated molding modes,
As long as guaranteeing corresponding electric conductivity.
The embodiment 2 of contact provided by the present invention:
As shown in figure 4, the contact that embodiment 2 provides, compared with the contact in embodiment 1, difference essentially consists in: front-seat
First contact 24 of contact arm 22 and the second contact 23 of heel row contact arm 21 are staggeredly arranged in the lateral direction.In fact, by
It is staggeredly arranged in the longitudinal direction in front-seat contact arm 22 and heel row contact arm 21, also, the first contact 24 and the second contact 23
It is in staggered distribution in the lateral direction, this connects entire contact without the concern for two adjacent front-seat contact arms or two adjacent heel row
Processing gap between contact arm can arrange contact arm as much as possible in the lateral direction, and then increase contact, increase through-flow
Ability.
And in the chip-type contact as disclosed in the Chinese invention patent application that application publication number is CN10714305A, piece
The front and rear row conductive sheet that formula contact has itself cooperatively forms socket, the either front-seat conduction being sequentially arranged in left-right direction
The conductive sheet that piece or heel row are sequentially arranged in left-right direction requires to reserve a processing between the conductive sheet of arbitrary neighborhood
Gap, the gap width is different and different according to material, generally a wall thickness of conductive sheet, sets for having on left and right directions
For the contact of measured length, the presence for processing gap actually occupies space in the lateral direction, inevitably subtracts
The quantity for the conductive sheet that can be arranged is lacked.This is also that front and rear row contact arm is arranged on contact provided by the present embodiment and makes
Obtain the meaning that the first contact and the second contact are staggeredly arranged in the lateral direction.
Specifically, in the present embodiment, front-seat contact arm 22 is in left-right direction successively there are two arranged for interval, and heel row
Contact arm 21 is then in left-right direction successively there are three arranged for interval, after the spacing of adjacent two front-seat contact arms can accommodate one
Arrange contact arm, and the spacing of adjacent two heel row contact arm can accommodate a front-seat contact arm, each front row contact arm and it is each after
Row's contact arm is successively alternately arranged in left-right direction, also, is also equipped between adjacent front-seat contact arm and heel row contact arm
Gap, the gap are for convenience to be alternately arranged front and rear row contact arm.In fact, in the lateral direction, front-seat contact arm and
Gap between heel row contact arm can be small as far as possible, or and zero, i.e., front-seat contact arm and heel row contact arm are in left and right
Direction successively contacts, in this way can reduction space waste as much as possible, arrangement contact arm as much as possible, and then as more as possible
Increase number of contacts, improve through-current capability.
Also, the alignment in the up-down direction of the first contact 24 and the second contact 23 herein, this allows for adjacent
The gap minimum of front-seat contact arm and heel row contact arm in the lateral direction is only zero.In other embodiments, the first contact
It can also be in staggered distribution in the up-down direction with the second contact.
It should be strongly noted that in the present embodiment, the first contact 24 and the second contact 23 also be located at it is same vertically
It, in other embodiments, can also be according to actual needs so that it is convenient to which mating contact is inserted into the vertical plane that direction extends
It is not at the first contact and the second contact in the same vertical plane vertically extended, for example, multiple can be made
Vertical plane locating for vertical plane locating for one contact and multiple second contacts is arranged in parallel, but is spaced cloth in the longitudinal direction
It sets, at this point, the spacing setting between adjacent front-seat contact arm and heel row contact arm can be in negative value, negative value herein is referred to
First contact and the second contact are staggered in the lateral direction, but there is the overlapping of part, i.e., front-seat contact arm and heel row contact
Another situation of arm interlaced arrangement.
Certainly, in the present embodiment, for heel row contact arm, since it is desired that being in the second contact with the first contact
In the same vertical plane, setting is also required on heel row contact arm 21 makes the upper bending part 25 of the second contact biased forwards.Equally
, for convenience of mating contact insertion, also it is respectively set in the lower end of front-seat contact arm and heel row contact arm corresponding curved backward
The lower bending part of folding.
Another contact that usually requires to arrange in pairs or groups when specifically used of contact provided in above-mentioned two embodiment is matched
Close to form the socket for corresponding mating contact grafting, certainly, can also be arranged in the unilateral side of mating contact and with
Corresponding mating contact contact.
The embodiment 1 of connector provided by the present invention:
The structure of connector in the embodiment is as shown in Fig. 5, Fig. 6 and Fig. 7 comprising shell 100 is connect equipped with flow increasing in shell
Contact element is to 200, which is cooperatively formed to 200 by two contacts of relative spacing distribution, in fact, belonging to same
Flow increasing contact cooperatively forms the socket 300 for the insertion of corresponding mating contact to 200 two contacts, and contact herein is adopted
With contact piece structure in above-mentioned contact embodiment 1 as shown in Figure 3.
Certainly, in other embodiments, it is real that contact as shown in Figure 4 can also be used in the contact of flow increasing contact centering
Apply the contact piece structure in example 2.
In the present embodiment, two contacts of flow increasing contact pair are all made of contact piece structure as shown in Figure 3, in other realities
It applies in example, one of contact in two contacts of flow increasing contact pair can also only be made to connect using as shown in Figure 3 or Figure 4
Contact element structure.
The embodiment 2 of connector provided by the present invention:
The structure of connector in the embodiment is as shown in Fig. 8, Fig. 9 and Figure 10 comprising shell 100 is equipped with flow increasing in shell
Contact 200, the flow increasing contact 200 is using the contact piece structure in contact embodiment 1 as shown in Figure 3, in the housing,
In the front side of flow increasing contact, there are the grafting spaces 300 being inserted into connector grafting for corresponding mating contact.This implementation
In example, flow increasing contact is one-side contact cooperation with corresponding mating contact.
Claims (10)
1. a kind of contact, including the conductive fixed part with corresponding exit, it is characterised in that: will be towards mating contact
Side is defined as front side, and the front-seat contact for being arranged in described mating contact the same side is provided projectingly on conductive fixed part
Arm and heel row contact arm, two rows of contact arms vertically extend, and the front side of front-seat contact arm has for being adapted to described
First contact of contact contact, the front side of heel row contact arm have the second contact for contacting with the mating contact,
First contact and the second contact are staggeredly arranged.
2. contact according to claim 1, it is characterised in that: arranged for interval has the front row contact arm in left-right direction
At least two, arranged for interval has at least two to the heel row contact arm in left-right direction.
3. contact according to claim 2, it is characterised in that: first contact in the up-down direction with the second contact
It is staggeredly arranged.
4. contact according to claim 3, it is characterised in that: the first contact of each front row contact arm is located at each heel row and connects
The top of second contact of contact arm.
5. contact according to claim 4, it is characterised in that: the first contact of all front row contact arms is in front-rear direction
Upper alignment is staggeredly arranged, and the second contact of all heel row contact arms is aligned or is staggeredly arranged in the longitudinal direction.
6. contact according to claim 3, it is characterised in that: the front row contact arm is in the longitudinal direction described in face
Heel row contact arm arrangement.
7. contact according to claim 2, it is characterised in that: the first contact of the front row contact arm and heel row contact
Second contact of arm is staggeredly arranged in the lateral direction.
8. contact according to claim 7, it is characterised in that: each front row contact arm and each heel row contact arm are along right and left
To being successively alternately arranged.
9. a kind of connector, including shell, it is characterised in that: be equipped at least one flow increasing contact pair in shell, which connects
Contact element cooperatively forms two contacts being distributed by relative spacing, belongs to the two contacts cooperation shape of the same flow increasing contact pair
At the socket for the insertion of corresponding mating contact, belong to the contact of at least one of two contacts of the same flow increasing contact pair
Part uses contact described in any item of the claim 1 to 8.
10. a kind of connector, including shell, it is characterised in that: at least one flow increasing contact is equipped in shell, in this in shell
There are in connector grafting, for the grafting space of corresponding mating contact insertion, the flow increasing is contacted for the front side of flow increasing contact
Part uses contact described in any item of the claim 1 to 8.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810703379 | 2018-06-30 | ||
| CN2018107033790 | 2018-06-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110459894A true CN110459894A (en) | 2019-11-15 |
| CN110459894B CN110459894B (en) | 2020-12-04 |
Family
ID=68471635
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811571626.2A Active CN110459894B (en) | 2018-06-30 | 2018-12-21 | Contact and connector using same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110459894B (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4734041A (en) * | 1987-06-22 | 1988-03-29 | Control Data Corporation | Electrical power connector |
| JPH08236187A (en) * | 1995-02-28 | 1996-09-13 | Nec Corp | Contact structure and connector for electric connection |
| US20010039154A1 (en) * | 1998-08-20 | 2001-11-08 | Pierini John M. | Electrical connectors |
| CN101237089A (en) * | 2007-02-02 | 2008-08-06 | 伊那卡股份公司 | Female electrical terminal |
| CN206789746U (en) * | 2017-05-06 | 2017-12-22 | 立讯精密工业股份有限公司 | Power supply terminal |
-
2018
- 2018-12-21 CN CN201811571626.2A patent/CN110459894B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4734041A (en) * | 1987-06-22 | 1988-03-29 | Control Data Corporation | Electrical power connector |
| JPH08236187A (en) * | 1995-02-28 | 1996-09-13 | Nec Corp | Contact structure and connector for electric connection |
| US20010039154A1 (en) * | 1998-08-20 | 2001-11-08 | Pierini John M. | Electrical connectors |
| CN101237089A (en) * | 2007-02-02 | 2008-08-06 | 伊那卡股份公司 | Female electrical terminal |
| CN206789746U (en) * | 2017-05-06 | 2017-12-22 | 立讯精密工业股份有限公司 | Power supply terminal |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110459894B (en) | 2020-12-04 |
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