CN115241687A - Flexible circuit board and electronic equipment - Google Patents
Flexible circuit board and electronic equipment Download PDFInfo
- Publication number
- CN115241687A CN115241687A CN202210909767.0A CN202210909767A CN115241687A CN 115241687 A CN115241687 A CN 115241687A CN 202210909767 A CN202210909767 A CN 202210909767A CN 115241687 A CN115241687 A CN 115241687A
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- China
- Prior art keywords
- flexible circuit
- circuit board
- electrodes
- magnetic conductive
- magnetic
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- 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.)
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- 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
- H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
- H01R13/6205—Two-part coupling devices held in engagement by a magnet
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
- H01R12/70—Coupling devices
- H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
- H01R12/771—Details
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R12/00—Structural associations of a plurality of mutually-insulated electrical connecting elements, specially adapted for printed circuits, e.g. printed circuit boards [PCB], flat or ribbon cables, or like generally planar structures, e.g. terminal strips, terminal blocks; Coupling devices specially adapted for printed circuits, flat or ribbon cables, or like generally planar structures; Terminals specially adapted for contact with, or insertion into, printed circuits, flat or ribbon cables, or like generally planar structures
- H01R12/70—Coupling devices
- H01R12/77—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures
- H01R12/78—Coupling devices for flexible printed circuits, flat or ribbon cables or like structures connecting to other flexible printed circuits, flat or ribbon cables or like structures
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- 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
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/111—Pads for surface mounting, e.g. lay-out
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/11—Printed elements for providing electric connections to or between printed circuits
- H05K1/118—Printed elements for providing electric connections to or between printed circuits specially for flexible printed circuits, e.g. using folded portions
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- Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Combinations Of Printed Boards (AREA)
Abstract
The invention discloses a flexible circuit board and electronic equipment, the flexible circuit board includes: the flexible substrate is a substrate on which electrodes can be formed on a surface, the surface of the flexible substrate is provided with a plurality of electrodes, and the surfaces of the plurality of electrodes are provided with magnetic conductive thin films. The flexible circuit board is provided with the magnetic conductive film on the surface of the electrode, so that the electrode has magnetism, the magnetic conductive films on the two flexible circuit boards can be in adsorption contact, and the electrodes of the two flexible circuit boards are conducted through the magnetic conductive film due to the fact that the magnetic conductive film is made of a conductive material, and the electrical connection of the flexible circuit boards is achieved.
Description
Technical Field
The invention relates to the technical field of display. And more particularly, to a flexible circuit board and an electronic device.
Background
With the development of electronic technology, more and more wearable devices are used, and in order to reduce the size of the frame, the panels of most of the wearable smart devices (such as a smart watch and a bracelet) often adopt PIN designs (that is, TFPC bonding and COF bonding positions belong to the upper and lower sides of the panel), for example, MFPC and TFPC of a display module respectively extend from the edges of the upper and lower sides of the display module. The design can remove the conventional TFOF bonding process, and the MFPC and the TFPC are connected by changing the mode of connecting the connectors, for example, the MFPC and the TFPC are reversely folded to the back surface of the panel and then connected together through a ZIF connector, and then connected with the mainboard through the connector on the MFPC, so that the connection between the panel and an external circuit is realized.
However, since the plugging surface of the ZIF is small, the requirement on the position precision is high, and the TFPC and the MFPC need to be plugged after being bent, at present, no automation equipment is available for correspondence, and plugging can only be completed manually, but manual plugging is prone to cause the situation that a ZIF golden finger cannot be normally plugged into a connector due to low degree of freedom of a connection part between alignment deviation and the ZIF, and further the situation that the ZIF golden finger is broken after being plugged and unplugged for many times is caused, and material loss is caused.
Disclosure of Invention
The invention aims to provide a flexible circuit board and electronic equipment which have low requirements on position accuracy and are easy to connect.
According to an aspect of the present invention, there is provided a flexible circuit board including: the flexible substrate is a substrate on which electrodes can be formed on a surface, the surface of the flexible substrate is provided with a plurality of electrodes, and the surfaces of the plurality of electrodes are provided with magnetic conductive thin films.
Preferably, the polarities of the magnetic conductive films on adjacent electrodes are opposite.
Preferably, the magnetic conductive film comprises a conductive adhesive layer and a magnetic metal layer which are arranged in a stacked manner.
Preferably, the magnetic conductive film further comprises a metal layer located between the conductive adhesive layer and the magnetic metal layer, and the metal layer is made of weak magnetic or nonmagnetic metal material.
Preferably, the magnetic metal layer is made of iron, nickel or cobalt, and alloys or composite materials thereof, and the diamagnetic metal layer is made of copper or copper alloy materials.
Preferably, the area of the magnetic conductive film is smaller than the area of the electrode.
According to another aspect of the present invention, an electronic device is provided, which includes the flexible circuit board, where the flexible circuit board includes at least a first flexible circuit board and a second flexible circuit board, the first flexible circuit board is used to connect a touch driving chip in the electronic device, the second flexible circuit board is used to connect a display driving chip in the electronic device, the first flexible circuit board is provided with an extending end, the electrode is arranged at the extending end, and the first flexible circuit board and the second flexible circuit board are electrically connected through mutual adsorption contact of the electrodes.
Preferably, an edge along the protruding end is coated with an insulating glue to bond the first flexible circuit board to the second flexible circuit board.
Preferably, the surface of the protruding end is covered with an insulating sticker so that the first flexible circuit board is adhered to the second flexible circuit board.
Preferably, the extending end and the second flexible circuit board are respectively provided with an identification line for alignment.
The invention has the following beneficial effects:
the flexible circuit board is provided with the magnetic conductive film on the surface of the electrode, so that the electrode has magnetism, the magnetic conductive films on the two flexible circuit boards can be in adsorption contact, and the electrodes of the two flexible circuit boards are conducted through the magnetic conductive film due to the fact that the magnetic conductive film is made of a conductive material, and the electrical connection of the flexible circuit boards is achieved.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
Fig. 1 shows a schematic structural diagram of a flexible circuit board of the present invention.
Fig. 2 shows a cross-sectional view of the electrodes and magnetic conductive film of the flexible circuit board of the present invention.
Fig. 3 shows a cross-sectional view of the electronic device of the invention.
Fig. 4 is a partial structural schematic diagram of the first flexible circuit board and the second flexible circuit board according to the present invention.
Detailed Description
In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.
In wearable smart electronic devices, flexible circuit boards are generally used to implement the design of the electronic devices. The electronic equipment comprises a flexible circuit board (TFPC) communicated with a touch chip and a flexible circuit board (MFPC) communicated with a display driving chip.
In the current wearable intelligent electronic device, in order TO reduce the size of the device and save the internal space, the connection mode of the board TO the board (botob) is adjusted TO be a ZIF plug-in mode, that is, the connection between the TFPC and the MFPC adopts the ZIF plug-in mode.
Namely, one side of the TFPC is provided with an extending end, the MFPC is provided with a ZIF connector, and the tail end of the extending end is connected with the ZIF connector arranged on the MFPC to realize the electrical connection of the two flexible circuit boards.
It can be understood that the ZIF has a small plugging surface and high requirement on alignment precision, and the ZIF is not corresponding to the ZIF by automation equipment at present and can only be plugged manually. When manual grafting, because the alignment degree of difficulty is high, need carry out many times and try, and then lead to many times to insert and pull out the back, the ZIF golden finger is broken and is damaged, causes the material loss. In order to improve the alignment precision, the manufacturing tolerance of the size of the golden finger of the FPC can be improved, and the problem that the connector cannot be inserted due to the fact that the golden finger is too large in manufacturing size is avoided.
In view of the above problems, the present invention provides a flexible circuit board, as shown in fig. 1, which includes a flexible substrate 1, the flexible substrate 1 being a substrate on the surface of which electrodes can be formed, specifically, the flexible substrate 1 is made of mylar or polyimide material, and a circuit is formed in the flexible circuit board by bonding a copper foil, which forms a conductive layer, to an insulating layer in the flexible circuit board by using an adhesive. The end of the flexible substrate 1 is provided as an electrode portion in which a plurality of electrodes 2 are provided, and the electrodes 2 are formed of copper foil. The surface of each electrode 2 is provided with a magnetic conductive film 3, and the magnetic conductive film 3 needs to be magnetized before being attached to the electrode 2, so that a magnetic pole is formed on the surface of the magnetic conductive film 3.
It should be noted that, when the electrode 2 of the flexible circuit board is attached to the electrode 2 of another flexible circuit board, the polarities of the surfaces of the magnetic conductive films 3 on the surfaces of the two flexible circuit board electrodes 2 are opposite, so that the electrodes 2 on the two flexible circuit boards can attract each other, and the two flexible circuit boards can be attached and contacted, thereby achieving electrical connection.
The flexible circuit board is characterized in that the magnetic conductive films 3 are arranged on the surfaces of the electrodes 2, so that the electrodes 2 have magnetism, the magnetic conductive films 3 on the two flexible circuit boards can be in adsorption contact, and the magnetic conductive films 3 are made of conductive materials, so that the electrodes 2 of the two flexible circuit boards are conducted through the magnetic conductive films 3, and the flexible circuit boards are electrically connected.
Because the electrodes 2 of the flexible circuit boards are connected through magnetic force adsorption, the requirement on position precision can be lowered, and when the flexible circuit boards are connected manually, the electrodes 2 of the two flexible circuit boards are close to each other to realize adsorption connection. Moreover, as each electrode 2 is provided with the magnetic conductive film 3, each electrode 2 can be ensured to be mutually attached to the corresponding electrode, so that the reliable connection between the two flexible circuit boards is ensured.
In this embodiment, the polarities of the surfaces of the magnetic conductive films 3 on the adjacent electrodes 2 are opposite, for example, the polarities of the surfaces of the magnetic conductive films 3 on the adjacent electrodes 2 are staggered in a manner of N-S-N-S8230 \8230;, 8230. It can be understood that the polarity of the magnetic conductive film of the other flexible circuit board connected with the flexible circuit board is set in a mode of S-N-S-N \8230, so that the magnetic conductive film 3 on each electrode 2 can be oppositely attracted with the magnetic conductive film on the corresponding electrode and mutually repulsed with the adjacent electrode, namely, the corresponding electrodes are mutually attracted and the adjacent electrodes are mutually repulsed, thereby ensuring that the electrodes of the two flexible circuit boards can be accurately connected and avoiding the problem of connection dislocation.
As shown in fig. 2, the magnetic conductive film 3 of the present embodiment includes a conductive adhesive layer 31 and a magnetic metal layer 32, which are stacked, that is, the magnetic metal layer 32 is adhered to the surface of the electrode 2 through the conductive adhesive layer 31. The magnetic metal layer 32 is made of hard magnetic material in metal ferromagnetism, such as iron, nickel or cobalt, and alloys or composite materials thereof. The magnetic metal layer 32 is conductive and is a hard magnetic material, i.e., the magnetic field does not disappear after magnetization. The conductive adhesive layer 31 is an adhesive layer, has conductivity, and is used for being attached to the surface of the electrode 2.
Further, the magnetic conductive film 3 further includes a metal layer 33, and the metal layer 33 is located between the conductive adhesive layer 31 and the magnetic metal layer 32, that is, the magnetic conductive film 3 includes the conductive adhesive layer 31, the metal layer 33 and the magnetic metal layer 32 which are stacked. The metal layer 33 is made of a weakly magnetic or nonmagnetic metal material having a good electrical conductivity, such as aluminum, copper, and alloys thereof. The metal layer 33 can improve the conductivity of the magnetic conductive film 3, and avoid the problem of increased contact resistance after the magnetic conductive film 3 is adhered to the surface of the electrode 2.
As shown in fig. 1, the area of the magnetic conductive film 3 is smaller than the area of the electrode 2, that is, after the magnetic conductive film 3 is adhered to the surface of the electrode 2, the magnetic conductive film 3 is located inside the edge of the electrode 2, so that the edge of the magnetic conductive film 3 does not exceed the edge of the electrode 2. The structure can prevent the edge of the magnetic conductive film 3 from exceeding the edge of the electrode 2 and contacting the magnetic conductive film 3 on the adjacent electrode 2, thereby avoiding the short circuit problem between the adjacent electrodes 2 during traveling.
Specifically, the width of the electrode 2 is 0.5mm, the height thereof is 2mm, the distance therebetween is 0.5mm, the width of the magnetic conductive film 3 is 0.4mm, and the height thereof is 1.9mm, so as to ensure that the edges of the two sides of the magnetic conductive film 3 are located at the inner side of the electrode 2 after the magnetic conductive film 3 is attached to the central position of the electrode 2.
The embodiment of the present application further provides an electronic device, as shown in fig. 3, the electronic device of this embodiment is an intelligent watch, and includes the above-mentioned flexible circuit board, and this flexible circuit board includes first flexible circuit board 10 and second flexible circuit board 20, and first flexible circuit board 10 is used for connecting the touch driving chip of display panel in the electronic device, and second flexible circuit board 20 is used for connecting display driving chip in the display panel, first flexible circuit board 10 is provided with and stretches out end 11, and electrode 2 sets up in stretching out end 11, also is provided with electrode 2 of the same structure on second flexible circuit board 20, because electrode 2 surface all is provided with magnetism conducting film 3, therefore first flexible circuit board 10 and second flexible circuit board 20 realize electric connection through the mutual adsorption contact of electrode 2.
The first flexible circuit board 10 and the second flexible circuit board 20 are in mutual adsorption contact through the magnetic conductive film 3 on the electrode 2, so that the first flexible circuit board 10 and the second flexible circuit board 20 are electrically connected, and connection in a connector mode is avoided. Because no connector is used for connection, the external dimensions of the electrodes 2 on the first flexible circuit board 10 and the second flexible circuit board 20 may be as large as possible, and are not limited by the dimensions of the connector, as long as the flexible circuit board has enough space to meet the arrangement requirements of the electrodes 2. The larger size of the electrode 2 is convenient for an operator to adsorb and connect the flexible circuit board, and is also convenient for attaching the magnetic conductive film on the surface of the electrode 2.
As shown in fig. 4, the protruding end 11 of the first flexible circuit board 10 is provided with a plurality of electrodes 2, the surface of each electrode 2 is attached with a magnetic conductive film 3, the polarities of the surfaces of the magnetic conductive films 3 on the adjacent electrodes 2 of the first flexible circuit board 10 are opposite, for example, the polarities of the surfaces of the magnetic conductive films 3 on the adjacent electrodes 2 of the first flexible circuit board 10 are in a staggered arrangement in a manner of N-S-82308230, 8230, and in a staggered arrangement in a manner of S-N-82308230on the magnetic conductive films 3 of the second flexible circuit board 20, so that the magnetic conductive films 3 on the first flexible circuit board 10 can be oppositely attracted to the magnetic conductive films 3 on the corresponding electrodes 22 of the second flexible circuit board 20 and mutually repelled to the adjacent electrodes, i.e., the corresponding electrodes are mutually attracted and mutually repelled to the adjacent electrodes, thereby ensuring that the electrodes of the two flexible circuit boards can be accurately connected and avoiding the problem of connection.
As shown in fig. 3, in the present embodiment, an insulating glue 30 is applied to an edge of the protruding end 11 of the first flexible circuit board 10, so that the protruding end 11 of the first flexible circuit board 10 is bonded to the second flexible circuit board 20, and the connection reliability is further improved. It can be understood that the insulating glue 30 will penetrate into the gap between the protruding end 11 and the second flexible circuit board 20, but as long as the surface of the magnetic conductive film 3 is not completely covered, the electrodes 2 can be conducted, and therefore the glue overflow amount of the insulating glue needs to be controlled.
In some embodiments, the surface of the protruding end 11 is covered with an insulating sticker, by which the protruding end 11 is adhered to the surface of the second flexible circuit board 20, thereby improving the connection reliability of the electrode 2.
Further, in the embodiment of the present application, in order to improve the terminal alignment precision of the electrode 2 of the end of stretching out 11 and second flexible circuit board 20, so that assemble the in-process in the manual work, realize first flexible circuit board 10 and second flexible circuit board 20 intercommunication in-process, stretch out end 11 and second flexible circuit board 20 once counterpoint, can set up the sign line that can mutually support in the corresponding position of stretching out end 11 and second flexible circuit board 20 respectively, utilize the sign line of the two to carry out preliminary counterpoint, so that electrode 2 on first flexible circuit board 10 and the second flexible circuit board 20 is close to and adsorbs the contact each other, production line production efficiency is promoted.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly and encompass, for example, both fixed and removable coupling as well as integral coupling; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It should also be noted that, in the description of the present invention, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising one of 8230; \8230;" 8230; "does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
It should be understood that the above-described embodiments of the present invention are examples for clearly illustrating the invention, and are not to be construed as limiting the embodiments of the present invention, and it will be obvious to those skilled in the art that various changes and modifications can be made on the basis of the above description, and it is not intended to exhaust all embodiments, and obvious changes and modifications can be made on the basis of the technical solutions of the present invention.
Claims (10)
1. The flexible circuit board is characterized by comprising a flexible substrate, wherein the flexible substrate is used as a substrate on the surface of which electrodes can be formed, the surface of the flexible substrate is provided with a plurality of electrodes, and the surfaces of the electrodes are provided with magnetic conductive thin films.
2. The flexible circuit board of claim 1, wherein the magnetic conductive films on adjacent electrodes are of opposite polarity.
3. The flexible circuit board of claim 1, wherein the magnetic conductive film comprises a conductive adhesive layer and a magnetic metal layer stacked together.
4. The flexible circuit board of claim 3, wherein the magnetic conductive film further comprises a metal layer between the conductive adhesive layer and the magnetic metal layer, the metal layer being made of a weakly magnetic or non-magnetic metal material.
5. The flexible circuit board of claim 4, wherein the magnetic metal layer is made of iron, nickel or cobalt, and alloys or composite materials thereof, and the diamagnetic metal layer is made of copper or copper alloy material.
6. The flexible circuit board of claim 1, wherein the area of the magnetic conductive film is smaller than the area of the electrode.
7. An electronic device, comprising the flexible circuit board according to any one of claims 1 to 6, wherein the flexible circuit board at least comprises a first flexible circuit board and a second flexible circuit board, the first flexible circuit board is used for connecting a touch driving chip in the electronic device, the second flexible circuit board is used for connecting a display driving chip in the electronic device, the first flexible circuit board is provided with an extending end, the electrode is arranged at the extending end, and the first flexible circuit board and the second flexible circuit board are electrically connected through mutual adsorption contact of the electrodes.
8. The electronic device of claim 7, wherein an edge along the protruding end is coated with an insulating glue to bond the first flexible circuit board to the second flexible circuit board.
9. The electronic device of claim 7, wherein the protruding end surface is covered with an insulating sticker to bond the first flexible circuit board to the second flexible circuit board.
10. The electronic device of claim 7, wherein the protruding end and the second flexible circuit board are respectively provided with an identification line for alignment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210909767.0A CN115241687A (en) | 2022-07-29 | 2022-07-29 | Flexible circuit board and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210909767.0A CN115241687A (en) | 2022-07-29 | 2022-07-29 | Flexible circuit board and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115241687A true CN115241687A (en) | 2022-10-25 |
Family
ID=83676882
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210909767.0A Pending CN115241687A (en) | 2022-07-29 | 2022-07-29 | Flexible circuit board and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115241687A (en) |
-
2022
- 2022-07-29 CN CN202210909767.0A patent/CN115241687A/en active Pending
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