CN105101700B - Mobile terminal and flexible circuit board - Google Patents
Mobile terminal and flexible circuit board Download PDFInfo
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- CN105101700B CN105101700B CN201510323231.0A CN201510323231A CN105101700B CN 105101700 B CN105101700 B CN 105101700B CN 201510323231 A CN201510323231 A CN 201510323231A CN 105101700 B CN105101700 B CN 105101700B
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Abstract
The invention discloses a mobile terminal and a flexible circuit board, wherein the mobile terminal comprises a metal dustproof net, an integrated circuit and the flexible circuit board, wherein the flexible circuit board comprises a substrate, a wiring area and at least one electromagnetic interference shielding layer, the electromagnetic interference shielding layer covers the wiring area, a conductive layer is arranged in the electromagnetic interference shielding layer, the wiring area is a certain reserved width away from the edge of the substrate to form a reserved part on the substrate, a plurality of exposed conductive points electrically connected with the conductive layer in the electromagnetic interference shielding layer are formed on the reserved part, and the exposed conductive points are positioned between the wiring area and the metal dustproof net to prevent static electricity on the metal dustproof net from jumping to the wiring area. Through the mode, the flexible printed circuit board can quickly release static electricity, avoids accumulation of the static electricity in a wiring area of the flexible printed circuit board, and reduces the fault risk of the flexible printed circuit board.
Description
Technical Field
The invention relates to the technical field of electronic products, in particular to a mobile terminal and a flexible circuit board for the mobile terminal.
Background
Mobile terminals (e.g., mobile phones) are all required to meet a related test of electrostatic discharge (ESD) immunity when they are shipped, and most of the mobile terminals are provided with metal dust screens, and the dust screens are close to a flexible circuit board inside the mobile terminal, which may result in that the mobile terminal cannot meet the related test of ESD immunity. Because static electricity is easy to jump and strike the wiring area of the flexible circuit board through the metal dustproof net, the circuit in the area is broken down, and the flexible circuit board is in failure; in addition, the Ground (GND) line on the flexible circuit board of the mobile terminal is narrow, which is likely to cause static electricity accumulation, thus further increasing the possibility of the line breakdown in the routing area.
Disclosure of Invention
The invention mainly solves the technical problem of providing the mobile terminal and the flexible circuit board for the mobile terminal, which can quickly release static electricity, avoid the accumulation of the static electricity in the wiring area of the flexible circuit board and reduce the fault risk of the flexible circuit board.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a mobile terminal including:
a metal dust screen for preventing dust from entering the interior of the mobile terminal;
an integrated circuit disposed inside the mobile terminal to enable the mobile terminal to implement various functions;
the flexible circuit board sets up inside the mobile terminal, just the flexible circuit board set up at the metal dust screen with between the integrated circuit and with integrated circuit electric connection, wherein, the flexible circuit board includes:
a substrate;
the wiring area is arranged on the substrate;
at least one electromagnetic interference shielding layer covering the wiring area, wherein a conductive layer is arranged in the electromagnetic interference shielding layer;
the wiring area is away from the edge of the substrate by a certain reserved width to form a reserved part on the substrate, a plurality of exposed conductive points electrically connected with the conductive layer in the electromagnetic interference shielding layer are formed on the reserved part, and the exposed conductive points are located between the wiring area and the metal dustproof net to prevent static electricity on the metal dustproof net from jumping to the wiring area.
The upper surface and the lower surface of the substrate are provided with the wiring areas, and the flexible circuit board comprises two electromagnetic interference shielding layers which respectively cover the wiring areas on the upper surface and the lower surface of the substrate.
Wherein the reserved width is set to at least 1 mm.
Wherein the EMI shielding layer further comprises:
a carrier film;
an insulating layer disposed on the carrier film, and the conductive layer disposed on the insulating layer;
and the protective film covers the conductive layer.
Wherein the conductive layer comprises:
a metal alloy layer disposed on the insulating layer;
and the conductive adhesive layer is arranged on the metal alloy layer.
The metal alloy layer is made of copper-silver alloy, and the exposed conductive points are made of copper.
The mobile terminal is a portable mobile terminal.
The metal dust screen is a dust screen of a receiver of the mobile terminal.
The integrated circuit is used for a touch screen of the mobile terminal.
In order to solve the technical problem, the invention adopts another technical scheme that: there is provided a flexible circuit board for a mobile terminal, including:
a substrate;
the wiring area is arranged on the substrate;
at least one electromagnetic interference shielding layer covering the wiring area, wherein a conductive layer is arranged in the electromagnetic interference shielding layer;
the wiring area is away from the edge of the substrate by a certain reserved width to form a reserved part on the substrate, and a plurality of exposed conductive points electrically connected with the conductive layer in the electromagnetic interference shielding layer are formed on the reserved part to prevent static from jumping into the wiring area.
The invention has the beneficial effects that: different from the prior art, the invention sets the wiring area of the flexible circuit board of the mobile terminal to be a certain reserved width away from the edge of the substrate to form a reserved part on the substrate, forms a plurality of exposed conductive points which are electrically connected with the conductive layer in the electromagnetic interference shielding layer covering the wiring area on the reserved part, and locates the exposed conductive points between the wiring area and the metal dust screen, so that when static electricity on the metal dust screen jumps to the flexible circuit board, the static electricity can be absorbed by the conductive points on the reserved part and conducted to the conductive layer in the electromagnetic interference shielding layer, because the electromagnetic interference shielding layer covers the wiring area and has a relatively large area, the whole conductive layer is equivalent to a ground wire, a large static electricity release path is formed, the static electricity is led out in advance and quickly, and the circuit of the wiring area is prevented from being broken down, the flexible circuit board fault risk is reduced, and the ESD performance of the mobile terminal is improved.
Drawings
FIG. 1 is a schematic diagram of a mobile terminal according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of another embodiment of a mobile terminal according to the present invention;
FIG. 3 is a schematic structural diagram of an embodiment of an EMI shielding layer according to the present invention;
FIG. 4 is a schematic diagram of a flexible circuit board for a mobile terminal according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another embodiment of a flexible circuit board for a mobile terminal according to the present invention.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and embodiments.
Referring to fig. 1 and 2, an embodiment of the present invention provides a mobile terminal, including a metal dust screen 10, an integrated circuit 11, and a flexible circuit board 12, wherein the metal dust screen 10 is used to prevent dust from entering the interior of the mobile terminal, the integrated circuit 11 is disposed inside the mobile terminal so that the mobile terminal can implement various functions, the flexible circuit board 12 is disposed inside the mobile terminal, the flexible circuit board 12 is disposed between the metal dust screen 10 and the integrated circuit 11 and electrically connected to the integrated circuit 11, and the integrated circuit 11 controls the mobile terminal to implement various functions through the flexible circuit board 12, wherein the flexible circuit board 12 includes a substrate 121, a routing area 122 and at least one electromagnetic interference shielding layer 123, the routing area 122 is disposed on the substrate 121, the flexible circuit board 12 is electrically connected to the integrated circuit 11 through the routing area 122, and the at least one electromagnetic interference shielding layer 123 covers the routing area 122, the electromagnetic interference shielding layer 123 is used to prevent electromagnetic waves from interfering with signal propagation to the trace area 122, wherein, as shown in fig. 3, the conductive layer 23 is disposed in the electromagnetic interference shielding layer 123.
The metal dust screen 10 is arranged at the position (such as a receiver and a loudspeaker) of the hole on the surface of the mobile terminal to prevent dust from entering the mobile terminal, and meanwhile, the sound effect of the hole position is not influenced, but static electricity on the mobile terminal is easy to be transmitted to the dust screen, the arrangement of elements in the mobile terminal is compact, the metal dust screen 10 is very close to the flexible circuit board 12 in the mobile terminal, generally below 1 millimeter, and therefore static electricity on the metal dust screen 10 is easy to jump and strike the flexible circuit board 12.
In the embodiment of the present invention, the trace area 122 on the flexible circuit board 12 is a certain reserved width d away from the edge of the substrate 121 to form a reserved portion 124 on the substrate 121, the reserved portion 124 is located between the trace area 122 and the metal dust-proof screen 10, so that static electricity on the metal dust-proof screen 10 strikes the trace area 122 and must pass through the reserved portion 124, a plurality of exposed conductive points 125 electrically connected to the conductive layer 23 in the electromagnetic interference shielding layer 123 are formed on the reserved portion 124, the exposed conductive points 125 are located between the trace area 122 and the metal dust-proof screen 10 to prevent static electricity on the metal dust-proof screen 10 from jumping to the trace area 122, the conductive points 125 may be welding points formed on the substrate 121, and the conductive points 125 are uniformly arranged along the reserved portion 124 near the edge of the substrate 121 of the metal dust-proof screen 10; when the static electricity on the metal dust screen 10 jumps to the flexible circuit board 12, the static electricity is first absorbed by the adjacent conductive points 125 (in the direction of the arrow in fig. 1) and conducted to the conductive layer 23 of the emi shielding layer 123, and the static electricity accumulated on the substrate 121 is also conducted to the conductive layer 23 of the emi shielding layer 123 through the conductive points 125; the conductive dots 125 according to the embodiment of the present invention are not limited to a dot shape, and may be arranged in a stripe shape or other shapes according to the actual situation such as the length of the reserved portion 124.
In the embodiment of the invention, the routing area 122 of the flexible circuit board 12 of the mobile terminal is set to a certain reserved width d away from the edge of the substrate 121 to form the reserved portion 124 on the substrate 121, a plurality of exposed conductive points 125 electrically connected with the conductive layer 23 in the electromagnetic interference shielding layer 123 covering the routing area 122 are formed on the reserved portion 124, and the plurality of exposed conductive points 125 are located between the routing area 122 and the metal dust-proof net 10, so that when static electricity on the metal dust-proof net 10 jumps to the flexible circuit board 12, the static electricity is absorbed by the conductive points 125 on the reserved portion 124 and is conducted to the conductive layer 23 in the electromagnetic interference shielding layer 123, because the electromagnetic interference shielding layer 123 covers the routing area and has a relatively large area, the whole conductive layer 23 is equivalent to a ground wire, a large static electricity discharge path is formed, static electricity is led out in advance and quickly, and the line of the routing area 122 is prevented from being broken down, the failure risk of the flexible circuit board 12 is reduced, and the ESD performance of the mobile terminal is improved.
As shown in fig. 1, the upper and lower surfaces of the substrate 121 are provided with trace areas 122, and the flexible circuit board 12 includes two electromagnetic interference shielding layers 123 respectively covering the trace areas 122 on the upper and lower surfaces of the substrate 121.
When the routing areas 122 are disposed on both the upper and lower surfaces of the substrate 121 according to the embodiment of the present invention, the routing areas 122 on both the upper and lower surfaces of the substrate 121 may be set to have a predetermined width from the edge of the substrate 121, so as to form the reserved portions 124 between the routing areas 122 and the metal dust screens 10 on both the upper and lower surfaces of the substrate 121, and the conductive points 125 are disposed on the reserved portions 124 on both the upper and lower surfaces of the substrate 121, so that the conductive points 125 are electrically connected to the corresponding electromagnetic interference shielding layers 123, respectively, thereby improving the ESD performance of the mobile terminal.
In the embodiment of the present invention, the reserved width d of the reserved portion 124 is at least 1 mm, for example, 1 mm, 1.5 mm, or 2 mm, but the reserved width d of the reserved portion 124 may not be too large, the reserved width d of the reserved portion 124 may be just enough to set the conductive point 125 on the reserved portion 124, and the too large reserved width d may increase the area of the flexible circuit board 12, which is not favorable for the arrangement of the internal elements of the mobile terminal.
As shown in fig. 3, the electromagnetic interference shielding layer 123 further includes a carrier film 21, an insulating layer 22 and a protective film 24, where the insulating layer 22 is disposed on the carrier film 21, the conductive layer 23 is disposed on the insulating layer 22, the protective film 24 covers the conductive layer 23, and the protective film 24 is a side of the electromagnetic interference shielding layer 123 close to the routing area 122; the emi shielding layer 123 is used for preventing the trace area on the flexible circuit board 12 from being interfered by the electromagnetic wave in the mobile terminal, and in the embodiment of the present invention, the conductive point 125 electrically connected to the conductive layer 23 is disposed on the reserved portion 124, so that the conductive layer 23 of the emi shielding layer 123 releases the static electricity, thereby effectively preventing the static electricity from breaking through the line of the trace area 122, and meanwhile, the internal structure of the mobile terminal does not need to be greatly changed, no additional static electricity releasing element is added, the cost is effectively controlled, and the emi shielding effect of the emi shielding layer 123 on the trace area 122 is not affected. In the embodiment of the present invention, the emi shielding layer 123 may be extended to the covering reserved portion 124, and the protection film 24 is not disposed at the position of the emi shielding layer 123 corresponding to the conductive point 125, so that the conductive layer 23 is exposed at the side close to the conductive point 125, and the conductive point 125 is in contact with the exposed conductive layer 23, thereby achieving the electrical connection between the conductive point 125 and the conductive layer 23. The carrier film 21 may be made of a polyester material (PET), the thickness of the carrier film 21 may be 50 micrometers, the insulating layer 22 may be made of black ink, the thickness of the insulating layer 22 may be 5 micrometers, the protective film 24 may be made of a white polyester material, and the thickness of the protective film 24 may be 50 micrometers or 100 micrometers.
The conductive layer 23 of the electromagnetic interference shielding layer 123 may include a metal alloy layer 231 and a conductive adhesive layer 232, the metal alloy layer 231 is disposed on the insulating layer 22, and the conductive adhesive layer 232 is disposed on the metal alloy layer 231, in which the embodiment of the present invention may be disposed at a position of the electromagnetic interference shielding layer 123 corresponding to the conductive point 125 without disposing the protective film 24, so that the conductive adhesive layer 232 is exposed at a side close to the conductive point 125, and the conductive point 125 is in contact with the exposed conductive adhesive layer 232, thereby implementing an electrical connection between the conductive point 125 and the conductive layer 23; the protection film 24 and the conductive adhesive layer 232 may also be disposed at the position of the electromagnetic interference shielding layer 123 corresponding to the conductive point 125, so that the metal alloy layer 231 is exposed at the side close to the conductive point 125, and the conductive point 125 contacts with the exposed metal alloy layer 231, thereby achieving the electrical connection between the conductive point 125 and the conductive layer 23. The metal alloy layer 231 may be a copper-silver alloy with a thickness of 0.2 μm, and the conductive adhesive layer 232 may be a resin with a thickness of 10 μm.
The conductive dots 125 can be made of copper or copper alloy.
The mobile terminal according to the embodiment of the present invention may be a portable mobile terminal, such as a mobile phone, a tablet computer, etc., and the metal dust-proof screen 10 may be a dust-proof screen of a handset of the mobile terminal, and the integrated circuit 11 may be an integrated circuit 11 for a touch screen of the mobile terminal. Generally, the flexible circuit board 12 connected to the integrated circuit 11 for the touch screen of the mobile terminal is very close to the metal dust screen 10 of the handset, and static electricity on the metal dust screen 10 is easily jumped to the flexible circuit board 12, which may break through the circuit in the routing area 122, thereby disabling the touch screen; in the embodiment of the invention, the conductive layer 23 of the electromagnetic interference shielding layer 123 is adopted to rapidly release static electricity, so that the problems are effectively solved, and the touch screen is prevented from being invalid.
Referring to fig. 4 and 5, another embodiment of the present invention provides a flexible circuit board for a mobile terminal, including a substrate 31, a routing region 32 and at least one electromagnetic interference shielding layer 33, wherein the routing region 32 is disposed on the substrate 31, the at least one electromagnetic interference shielding layer 33 covers the routing region 32, a conductive layer is disposed in the electromagnetic interference shielding layer 33, a certain reserved width of the routing region 32 from an edge of the substrate 31 is formed to form a reserved portion 34 on the substrate 31, and a plurality of exposed conductive points 35 electrically connected to the conductive layer in the electromagnetic interference shielding layer 33 are formed on the reserved portion 34, so as to prevent static electricity from jumping into the routing region 32. The flexible circuit board for the mobile terminal of this embodiment has the same structure as the flexible circuit board in the mobile terminal of the above embodiment, and can achieve the same function.
The embodiment of the present invention sets the routing area 32 of the flexible circuit board to a certain reserved width from the edge of the substrate 31 to form a reserved portion 34 on the substrate 31, a plurality of exposed conductive points 35 electrically connected to the conductive layer in the emi shielding layer 33 covering the trace area 32 are formed on the reserved portion 34, and a plurality of exposed conductive points 35 are located between the trace area 32 and the metal dust screen, so that when static electricity jumps to the flexible circuit board, the static electricity jumps to be absorbed by the conductive points 35 on the reserved portion 34, and conducted to the conductive layer in the emi shielding layer 33, since the emi shielding layer 33 covers the routing area, has a relatively large area, therefore, the whole conducting layer is equivalent to a ground wire, a large static electricity discharge path is formed, static electricity is led out in advance and quickly, the circuit of the wiring area 32 is prevented from being broken down, and the fault risk of the flexible circuit board is reduced.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A mobile terminal, comprising:
a metal dust screen for preventing dust from entering the interior of the mobile terminal;
an integrated circuit disposed inside the mobile terminal to enable the mobile terminal to implement various functions;
the flexible circuit board sets up inside the mobile terminal, just the flexible circuit board set up at the metal dust screen with between the integrated circuit and with integrated circuit electric connection, wherein, the flexible circuit board includes:
a substrate;
the wiring area is arranged on the substrate;
at least one electromagnetic interference shielding layer covering the wiring area, wherein a conductive layer is arranged in the electromagnetic interference shielding layer;
the electromagnetic interference shielding layer further includes:
a carrier film;
an insulating layer disposed on the carrier film, and the conductive layer disposed on the insulating layer;
a protective film covering the conductive layer;
the wiring area is away from the edge of the substrate by a certain reserved width to form a reserved part on the substrate, a plurality of exposed conductive points electrically connected with the conductive layer in the electromagnetic interference shielding layer are formed on the reserved part, and the exposed conductive points are located between the wiring area and the metal dustproof net to prevent static electricity on the metal dustproof net from jumping to the wiring area.
2. The mobile terminal of claim 1, wherein the trace areas are disposed on both the upper and lower surfaces of the substrate, and the flexible circuit board comprises two electromagnetic interference shielding layers respectively covering the trace areas on the upper and lower surfaces of the substrate.
3. The mobile terminal of claim 1, wherein the reserved width is set to at least 1 millimeter.
4. The mobile terminal of claim 1, wherein the conductive layer comprises:
a metal alloy layer disposed on the insulating layer;
and the conductive adhesive layer is arranged on the metal alloy layer.
5. The mobile terminal of claim 4, wherein the metal alloy layer is made of a copper-silver alloy and the plurality of exposed conductive dots are made of copper.
6. The mobile terminal of claim 1, wherein the mobile terminal is a portable mobile terminal.
7. The mobile terminal of claim 6, wherein the metal dust screen is a dust screen of an earpiece of the mobile terminal.
8. The mobile terminal of claim 6, wherein the integrated circuit is an integrated circuit for a touch screen of the mobile terminal.
9. A flexible circuit board for a mobile terminal, comprising:
a substrate;
the wiring area is arranged on the substrate;
at least one electromagnetic interference shielding layer covering the wiring area, wherein a conductive layer is arranged in the electromagnetic interference shielding layer;
the electromagnetic interference shielding layer further includes:
a carrier film;
an insulating layer disposed on the carrier film, and the conductive layer disposed on the insulating layer;
a protective film covering the conductive layer;
the wiring area is away from the edge of the substrate by a certain reserved width to form a reserved part on the substrate, and a plurality of exposed conductive points electrically connected with the conductive layer in the electromagnetic interference shielding layer are formed on the reserved part to prevent static from jumping into the wiring area.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510323231.0A CN105101700B (en) | 2015-06-12 | 2015-06-12 | Mobile terminal and flexible circuit board |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510323231.0A CN105101700B (en) | 2015-06-12 | 2015-06-12 | Mobile terminal and flexible circuit board |
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| CN105101700A CN105101700A (en) | 2015-11-25 |
| CN105101700B true CN105101700B (en) | 2020-02-21 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106657478B (en) * | 2017-01-20 | 2020-03-03 | Oppo广东移动通信有限公司 | Fingerprint identification module and mobile terminal |
| CN107507514A (en) * | 2017-10-12 | 2017-12-22 | 惠科股份有限公司 | A kind of display device |
| CN111201629A (en) * | 2017-11-10 | 2020-05-26 | 深圳市柔宇科技有限公司 | Flexible backboard, flexible display device and preparation method |
| CN110430661B (en) * | 2019-07-26 | 2020-10-30 | 钛深科技(深圳)有限公司 | Flexible circuit board capable of being used in flexible touch sensing field and manufacturing method thereof |
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| TWM393738U (en) * | 2010-06-15 | 2010-12-01 | Emerging Display Tech Corp | Touch panel preventing electrostatic damage |
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| CN101349793A (en) * | 2007-07-20 | 2009-01-21 | 鸿富锦精密工业（深圳）有限公司 | Camera module group |
| TWI388248B (en) * | 2010-06-25 | 2013-03-01 | Pegatron Corp | Electronic device |
| CN103324341A (en) * | 2013-06-07 | 2013-09-25 | 业成光电（深圳）有限公司 | Touch panel and electronic device provided with same |
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| CN101945149A (en) * | 2009-07-06 | 2011-01-12 | 三星电子株式会社 | Portable terminal with flexible printed circuit board |
| TWM393738U (en) * | 2010-06-15 | 2010-12-01 | Emerging Display Tech Corp | Touch panel preventing electrostatic damage |
| CN102917527A (en) * | 2012-10-15 | 2013-02-06 | 北京小米科技有限责任公司 | Electrical component and mobile terminal |
| CN103879119A (en) * | 2012-12-20 | 2014-06-25 | 深圳科诺桥科技有限公司 | Printed circuit board, high-filling-power electromagnetic shielding film and making method of film |
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