CN111653445A - Injection molded membrane switch - Google Patents
Injection molded membrane switch Download PDFInfo
- Publication number
- CN111653445A CN111653445A CN202010700274.7A CN202010700274A CN111653445A CN 111653445 A CN111653445 A CN 111653445A CN 202010700274 A CN202010700274 A CN 202010700274A CN 111653445 A CN111653445 A CN 111653445A
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- China
- Prior art keywords
- layer
- injection molding
- groove
- electrode
- membrane switch
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/04—Cases; Covers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/10—Bases; Stationary contacts mounted thereon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/12—Movable parts; Contacts mounted thereon
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
- H01H13/02—Details
- H01H13/12—Movable parts; Contacts mounted thereon
- H01H13/14—Operating parts, e.g. push-button
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
- H03K17/96—Touch switches
- H03K17/962—Capacitive touch switches
Abstract
The invention discloses an injection-molded membrane switch, which belongs to the field of membrane switches and comprises a panel layer, an upper electrode, an isolating layer and a lower circuit board which are sequentially arranged; the upper surface of the isolation layer is provided with an upper injection molding composite layer, the panel layer is arranged on the upper injection molding composite layer, the upper injection molding composite layer is provided with a groove, and the upper electrode is arranged in the groove; an extending part extending towards the direction of the closed opening is arranged at the opening of the groove, and the extending part limits the electrode layer to leave the groove; the upper surface of the isolation layer is provided with a lower injection molding composite layer, and the lower circuit board is wrapped in the lower injection molding composite layer; the upper electrode, the lower circuit board and the isolation layer are connected together by arranging injection molding composite layers on the upper side and the lower side of the isolation layer, and the isolation layer can be directly formed integrally through injection molding; compared with the prior art that the isolating layer, the upper electric layer and the lower electric layer are connected by the surface rubber layer, the anti-aging insulating layer has stronger durability and ageing resistance.
Description
Technical Field
The invention relates to the technical field of membrane switches, in particular to an injection molded membrane switch.
Background
The membrane switch is widely applied to various electronic products because of the light and thin volume and the extremely small sound generated when being pressed; the traditional membrane switch generally consists of a panel, an upper circuit, an isolation layer and a lower circuit; but instead of the other end of the tube
Through gluing the laminating between upper circuit, lower floor's circuit and the insulating layer, this mode of gluing the laminating not only requires highly to glue, and can't laminate the complex construction finished product, and the product durability is not high.
Disclosure of Invention
Aiming at the defects in the technology, the invention provides the injection molding membrane switch, wherein the upper side and the lower side of the isolation layer are provided with injection molding composite layers, the upper electrode and the lower circuit board are arranged on the injection molding composite layers, and the three layers are stably connected and have strong durability.
In order to achieve the purpose, the invention provides an injection molding membrane switch, which comprises a panel layer, an upper electrode, an isolation layer and a lower circuit board which are arranged in sequence; the upper surface of the isolation layer is provided with an upper injection molding composite layer, the panel layer is arranged on the upper injection molding composite layer, the upper injection molding composite layer is provided with a groove, and the upper electrode is arranged in the groove; an extending part extending towards the direction of the closed opening is arranged at the opening of the groove, and the extending part limits the electrode layer to leave the groove; the upper surface of the isolation layer is provided with a lower injection molding composite layer, and the lower circuit board is wrapped in the lower injection molding composite layer.
Wherein, the upper electrode is connected with the bottom of the groove through the compressible deformation supporting structure.
Wherein, the panel is provided with a key, and the key contact and the upper electrode are mutually supported; and when the key is pressed, the upper layer electrode presses the compressible deformation supporting structure downwards, so that the distance between the upper layer electrode and the lower layer circuit is changed.
Wherein, the isolation layer is one of PTFE, FEP, COC, PET, PI, PE, PEN or PP.
Wherein, the electrode material of the upper electrode is selected from one of aluminum, gold, silver, graphite or graphene.
The upper injection molding composite layer comprises a plurality of grooves, and an upper electrode is arranged in each groove; the lower circuit board is provided with a plurality of lower electrodes corresponding to the upper electrodes; the upper electrode leads out an upper electrode lead.
Wherein, a layer of metal film is arranged on the side wall of each groove.
Wherein, the upper electrode is a charged electrode.
Wherein, the isolation layer is transparent plastic, and the lower circuit board is provided with a light emitting diode; the light of the light emitting diode penetrates through the isolation layer and then is emitted to the panel layer.
Wherein, the lower injection molding composite layer is connected with the isolation layer to form an accommodating cavity with one open end; the lower circuit board is clamped in the accommodating cavity.
The invention has the beneficial effects that: the invention provides an injection molding membrane switch, which comprises a panel layer, an upper electrode, an isolation layer and a lower circuit board which are arranged in sequence; the upper surface of the isolation layer is provided with an upper injection molding composite layer, the panel layer is arranged on the upper injection molding composite layer, the upper injection molding composite layer is provided with a groove, and the upper electrode is arranged in the groove; an extending part extending towards the direction of the closed opening is arranged at the opening of the groove, and the extending part limits the electrode layer to leave the groove; the upper surface of the isolation layer is provided with a lower injection molding composite layer, and the lower circuit board is wrapped in the lower injection molding composite layer; the upper electrode, the lower circuit board and the isolation layer are connected together by arranging injection molding composite layers on the upper side and the lower side of the isolation layer, and the isolation layer can be directly formed integrally through injection molding; compared with the prior art that the isolating layer, the upper electric layer and the lower electric layer are connected by the surface rubber layer, the anti-aging insulating layer has stronger durability and ageing resistance.
Drawings
FIG. 1 is a structural relationship diagram of the present invention.
The main element symbols are as follows:
1. an upper injection molding composite layer; 2. an isolation layer; 3. a lower injection molding composite layer; 11. a groove; 111. an extension portion; 4. an upper electrode; 5. a support structure; 6. a lower layer circuit board; 61. and a lower electrode.
Detailed Description
In order to more clearly describe the present invention, the present invention will be further described with reference to the accompanying drawings.
As described in the background art, in the membrane switch of the prior art, the upper layer circuit, the lower layer circuit and the insulating layer are bonded by surface glue; the requirement on the surface adhesive is higher in the surface adhesive attaching mode; the durability and the ageing resistance of the surface glue are usually weaker.
Based on this, the invention provides an injection molding membrane switch, which is shown in fig. 1 and comprises a panel layer, an upper electrode 4, an isolation layer 2 and a lower circuit board 6 which are arranged in sequence; the upper surface of the isolation layer 2 is provided with an upper injection molding composite layer 1, the panel layer is arranged on the upper injection molding composite layer 1, the upper injection molding composite layer 1 is provided with a groove 11, and the upper electrode 4 is arranged in the groove 11; an extending part 111 extending towards the direction of the closed opening is arranged at the opening of the groove 11, and the extending part 111 limits the electrode layer to leave the groove 11; the upper surface of the isolation layer 2 is provided with a lower injection molding composite layer 3, and a lower circuit board 6 is wrapped in the lower injection molding composite layer 3; through the upper and lower both sides setting at isolation layer 2 the composite bed of moulding plastics, link together upper electrode 4 and lower floor's circuit board 6 and isolation layer 2, isolation layer 2 can be directly through the integrated into one piece that moulds plastics.
In the prior art, the isolation layer 2, the upper electrode and the lower circuit board 6 are connected by using a surface adhesive layer; the invention is provided with a groove 11 structure on the upper injection molding composite layer 1 of the isolating membrane, and the upper electrode is arranged in the groove 11 structure; and the lower injection molding composite layer 3 is connected with the isolation layer 2 to form an accommodating cavity with one open end; the lower circuit board 6 is clamped in the accommodating cavity; the physical structure is arranged on the isolation layer 2, so that the upper electrode, the lower layer circuit board 6 and the isolation layer 2 are connected; compared with the prior art, the structure formed by connecting the upper electrode, the lower layer circuit board 6 and the isolation layer 2 is durable and has stronger ageing resistance.
In the present embodiment, the isolation layer 2 is one of PTFE, FEP, COC, PET, PI, PE, PEN, or PP.
In the embodiment, the isolation layer 2, the upper injection molding composite layer 1 and the lower injection molding composite layer 3 are integrally formed through injection molding; a groove 11 is formed in the upper injection layer, the position of the groove 11 corresponds to the position of a key on the panel layer, and an extending part 111 extending towards the direction of the closed opening is arranged at the opening of the groove 11; the lower injection molding composite layer 3 is arranged in parallel with the isolation layer 2 at a certain distance from the base layer and then connected together to form an accommodating cavity with an opening at one end; the lower circuit board 6 is accommodated in the accommodating cavity.
In the present embodiment, the upper electrode 4 is connected to the bottom of the groove 11 through the compressible deformation support structure 5; the upper electrode layer is a metal block; the compressible deformable support structure 5 can be an insulating support structure 5 made by folding paper; one end of an insulating support structure 5 made by folding paper is adhered to the lower part of the upper electrode layer through glue; the other end is abutted against the bottom of the groove 11; wherein, the panel is provided with a key, and the key contact is mutually propped against the upper electrode 4; pressing the key, pressing the upper electrode 4 to press the insulating support structure 5 made by folding the paper, and changing the distance between the upper electrode 4 and the lower circuit; the lower circuit board 6 is provided with a plurality of lower electrodes 61 corresponding to the upper electrodes 4; after the distance between the lower electrode 61 and the upper electrode 4 is changed; the capacitance value between the two changes, thereby obtaining a signal of pressing down.
In the present embodiment, the upper electrode 4 is a charged electrode.
The membrane switch in this example was prepared as follows:
s1: injection molding to obtain an isolation layer 2, an upper injection molding composite layer 1 and a lower injection molding composite layer 3;
s2: the upper electrode 4 is arranged in the groove 11;
s3: charging the part of the upper electrode exposed to the opening of the groove 11;
s4: and the lower circuit board 6 is arranged in a containing cavity formed by the lower injection molding composite layer 3 and the isolating layer 2.
In this embodiment, the isolation layer 2 is made of FEP; carrying out corona polarization charging on the electrode at room temperature by a corona polarization system, wherein the corona voltage is-10 kV, the grid voltage is-1 kV, and the charging time is 5 min; after charging, an electrode lead is led out from the upper electrode 4; finally, covering the panel layer on the upper injection molding composite layer 1; wherein the upper electrode 4 and the lower electrode 61 are aluminum conductive electrodes; the panel layer is provided with a plurality of key patterns, and the key patterns correspond to the upper layer electrodes 4 in position; when a 0.2N force is applied to the thin key pattern, the key presses down the upper electrode 4, the distance between the upper electrode 4 and the lower electrode 61 changes, and the change value of the induced charge amount on the electrodes detected by the electrostatic meter is 2200 pC.
In the present embodiment, the electrode material of the upper electrode 4 is selected from one of aluminum, gold, silver, graphite, or graphene.
In the embodiment, the number of the grooves 11 of the upper injection molding composite layer 1 is multiple, and an upper electrode 4 is arranged in each groove 11; the lower circuit board 6 is provided with a plurality of lower electrodes 61 corresponding to the upper electrodes 4; each groove 11 corresponds to a pattern position on the corresponding panel layer.
In this embodiment, a metal film is disposed on the sidewall of each groove 11; the metal film is only distributed on the side wall of the groove 11, and the bottom of the groove 11 is not covered with the metal film; the thickness of the metal film is about 1 mm; in order to prevent the upper electrode 4 in the groove 11 from being influenced by the electric fields of the lower electrodes 61 except the corresponding positions in the lower circuit board 6; the function of shielding the peripheral electric field is achieved; when other keys of the panel layer are pressed, the change of the charge quantity of the upper layer electrode 4 per se is not influenced; or only minor changes.
In this embodiment, the isolation layer 2 is made of transparent plastic, and the lower circuit board 6 is provided with light emitting diodes; the light of the light emitting diode penetrates through the isolation layer 2 and then is emitted to the panel layer; thereby making the icons of the panel layer more conspicuous.
The invention has the advantages that:
1. the upper electrode, the lower circuit board and the isolation layer are connected together by arranging injection molding composite layers on the upper side and the lower side of the isolation layer, and the isolation layer can be directly formed integrally through injection molding; compared with the prior art that the isolating layer, the upper electric layer and the lower electric layer are connected by the surface rubber layer, the anti-aging insulating layer has stronger durability and ageing resistance.
2. The upper layer electrode is connected with the bottom of the groove through a compressible deformation supporting structure; pressing the keys on the panel layer to change the distance between the upper electrode and the lower circuit; after the distance between the lower electrode and the upper electrode is changed; the capacitance value between the two changes, so that a signal of depression is obtained.
3. A layer of metal film is arranged on the side wall of each groove; the metal film is only distributed on the side wall of the groove, and the bottom of the groove is not covered with the metal film; the metal film plays a role in shielding a peripheral electric field; when other keys of the panel layer are pressed, the change of the charge quantity of the upper layer electrode is not influenced; or only minor changes.
The above disclosure is only for a few specific embodiments of the present invention, but the present invention is not limited thereto, and any variations that can be made by those skilled in the art are intended to fall within the scope of the present invention.
Claims (10)
1. An injection-molded membrane switch comprises a panel layer, an upper electrode, an isolation layer and a lower circuit board which are arranged in sequence; the insulation layer is characterized in that an upper injection molding composite layer is arranged on the upper surface of the insulation layer, the panel layer is arranged on the upper injection molding composite layer, the upper injection molding composite layer is provided with a groove, and the upper electrode is arranged in the groove; an extending part extending towards the direction of the closed opening is arranged at the opening of the groove, and the extending part limits the electrode layer to leave the groove; the upper surface of the isolation layer is provided with a lower injection molding composite layer, and the lower circuit board is wrapped in the lower injection molding composite layer.
2. The injection molded membrane switch of claim 1, wherein the upper electrode is connected to the bottom of the groove by a compressibly deformable support structure.
3. The injection molded membrane switch of claim 2, wherein the panel is provided with a key, and a key contact and the upper electrode are mutually abutted; and when the key is pressed, the upper layer electrode presses the compressible deformation supporting structure downwards, so that the distance between the upper layer electrode and the lower layer circuit is changed.
4. The injection molded membrane switch of claim 1, wherein the barrier layer is one of PTFE, FEP, COC, PET, PI, PE, PEN, or PP.
5. The injection molded membrane switch of claim 1, wherein the electrode material of the upper electrode is selected from one of aluminum, gold, silver, graphite, or graphene.
6. The injection molded membrane switch of claim 1, wherein the number of the upper injection molded composite layer grooves is plural, and each groove is provided with an upper electrode; the lower circuit board is provided with a plurality of lower electrodes corresponding to the upper electrodes; the upper electrode leads out an upper electrode lead.
7. The injection molded membrane switch of claim 6, wherein each groove sidewall has a metal film disposed thereon.
8. The injection molded membrane switch of claim 1, wherein the upper electrode is a charged electrode.
9. The injection molded membrane switch of claim 1, wherein the isolation layer is a transparent plastic, and the lower circuit board has a light emitting diode; the light of the light emitting diode penetrates through the isolation layer and then is emitted to the panel layer.
10. The injection-molded membrane switch of claim 1, wherein the lower injection-molded composite layer is connected with the isolation layer to form a containing cavity with an opening at one end; the lower circuit board is clamped in the accommodating cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010700274.7A CN111653445B (en) | 2020-07-20 | 2020-07-20 | Injection-molded membrane switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010700274.7A CN111653445B (en) | 2020-07-20 | 2020-07-20 | Injection-molded membrane switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111653445A true CN111653445A (en) | 2020-09-11 |
| CN111653445B CN111653445B (en) | 2022-08-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010700274.7A Active CN111653445B (en) | 2020-07-20 | 2020-07-20 | Injection-molded membrane switch |
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| Country | Link |
|---|---|
| CN (1) | CN111653445B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001076579A (en) * | 1999-08-31 | 2001-03-23 | Takata Corp | Planar switch |
| CN103218047A (en) * | 2012-01-18 | 2013-07-24 | 台湾美琪电子工业股份有限公司 | Touch keyboard |
| CN108573823A (en) * | 2017-03-14 | 2018-09-25 | 上海锦昀电子科技有限公司 | Thin film switch |
| CN207937987U (en) * | 2016-11-02 | 2018-10-02 | 普瑞有限公司 | With force sensor array and by the input equipment of partially cured middle layer |
-
2020
- 2020-07-20 CN CN202010700274.7A patent/CN111653445B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001076579A (en) * | 1999-08-31 | 2001-03-23 | Takata Corp | Planar switch |
| CN103218047A (en) * | 2012-01-18 | 2013-07-24 | 台湾美琪电子工业股份有限公司 | Touch keyboard |
| CN207937987U (en) * | 2016-11-02 | 2018-10-02 | 普瑞有限公司 | With force sensor array and by the input equipment of partially cured middle layer |
| CN108573823A (en) * | 2017-03-14 | 2018-09-25 | 上海锦昀电子科技有限公司 | Thin film switch |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111653445B (en) | 2022-08-30 |
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