CN113257602B - Thin film switch - Google Patents
Thin film switch Download PDFInfo
- Publication number
- CN113257602B CN113257602B CN202110675027.0A CN202110675027A CN113257602B CN 113257602 B CN113257602 B CN 113257602B CN 202110675027 A CN202110675027 A CN 202110675027A CN 113257602 B CN113257602 B CN 113257602B
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- Prior art keywords
- conductor
- signal
- film
- signal circuit
- membrane switch
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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
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
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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
- H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
- H01H13/81—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard characterised by electrical connections to external devices
Abstract
The invention provides a membrane switch, which comprises a membrane, a partition board provided with a through hole, an air cavity, a conductor arranged in the air cavity, a first signal circuit and a second signal circuit, wherein the membrane comprises an upper membrane and a lower membrane; the partition plate is arranged between the upper film and the lower film; the air cavity is formed by enclosing the wall of the through hole, the lower surface of the upper film and the upper surface of the lower film; the conductor comprises an upper conductor, a first lower conductor and a second lower conductor; the first signal circuit comprises an upper conductor and a first lower conductor and is used for generating a first signal; the second signal circuit comprises an upper conductor and a second lower conductor and is used for generating a second signal; through setting up first, two signal circuit, can produce two different signals according to the size that the film bore pressure, through making first, two signal circuit parallelly connected, short circuit first signal circuit when second signal circuit switches on, when pressing the film, only produce one in two different signals, two signal mutual noninterferences can be exported and easily distinguish through same return circuit, and simple structure energy consumption is low, easily uses widely.
Description
Technical Field
The invention relates to the technical field of electric switches, in particular to a membrane switch.
Background
The membrane switch is a novel electronic switch for produce the signal, and current membrane switch constitutes signal circuit mostly through upper and lower electric conductor, produces the signal when signal circuit switch-on and have the electric current to flow through, but the signal circuit in the single intracavity of current membrane switch only one, and single pressing can only make membrane switch produce a signal, can not produce two different signals according to the size of pressing force, and the function is single.
In order to solve the problem, a membrane switch capable of generating a plurality of signals according to the magnitude of pressing force appears on the market, for example, chinese patent CN103165320B discloses a key, in which a digital switch and an analog switch are arranged between two layers of membranes, when the membranes bear a first pressure, the digital switch is turned on to generate a digital signal, and when the membranes bear a second pressure greater than the first pressure, the analog switch is turned on to generate an analog signal, but when the membranes bear the second pressure, the digital switch is still in a conducting working state, which not only increases energy consumption, but also generates a digital signal while generating an analog signal, and the analog signal and the digital signal need to be output by two loops respectively to be distinguished, so that the structure of the key is more complicated.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a membrane switch which can generate two different signals according to the magnitude of pressing force and can generate two different signals at different times.
In order to achieve the above object, the present invention provides a membrane switch, comprising:
a film comprising an upper film and a lower film;
the partition plate is arranged between the upper thin film and the lower thin film, and a through hole penetrating through the partition plate is formed in the partition plate;
the air cavity is formed by enclosing the hole wall of the through hole, the lower surface of the upper film and the upper surface of the lower film;
the electric conductor is arranged in the air cavity and comprises an upper electric conductor arranged on the lower surface of the upper film and a first lower electric conductor and a second lower electric conductor arranged on the upper surface of the lower film, when the film bears a first pressure, the upper electric conductor is in contact with the first lower electric conductor and is separated from the second lower electric conductor, and when the film bears a second pressure which is greater than the first pressure, the upper electric conductor is in contact with both the first lower electric conductor and the second lower electric conductor;
a first signal circuit including the upper conductor and the first lower conductor, the membrane switch generating a first signal by the first signal circuit when the upper conductor is in contact with the first lower conductor and a current flows through the first lower conductor;
a second signal circuit including the upper conductor and the second lower conductor, the membrane switch generating a second signal different from the first signal by the second signal circuit when the upper conductor is in contact with the second lower conductor and a current flows through the second lower conductor;
the first signal circuit is connected in parallel with the second signal circuit, the upper conductor and the second lower conductor are made of silver, when the film bears the second pressure, the first signal circuit is short-circuited by the second signal circuit, and the film switch does not generate the first signal.
Preferably, the first lower conductor is made of carbon.
Preferably, the first signal circuit further comprises an additional resistor in series with the first lower conductor.
Further preferably, the additional resistor is disposed on the upper surface of the lower film and is located in the air cavity.
Preferably, the first signal and the second signal are both digital signals, or the first signal and the second signal are both analog signals.
Preferably, the electrical conductor is sintered from a screen-printed paste.
Preferably, the shortest distance between the first lower conductor and the axis of the air cavity is smaller than the shortest distance between the second lower conductor and the axis of the air cavity.
Preferably, the first lower conductor is circular, and the second lower conductor is circular with an opening surrounding the first lower conductor.
Preferably, the air chamber is used to provide a spring back force required for the membrane to spring back.
Further preferably, the through holes are multiple, and the through holes are arranged at intervals.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
1. the first signal circuit comprises an upper conductor and a first lower conductor, the second signal circuit comprises an upper conductor and a second lower conductor, when the film bears a first pressure to make the upper conductor contact with the first lower conductor and a current flows through the first lower conductor, the film switch generates a first signal through the first signal circuit, and when the film bears a second pressure which is greater than the first pressure to make the upper conductor contact with the second lower conductor and a current flows through the second lower conductor, the film switch generates a second signal which is different from the first signal through the second signal circuit, so that the technical effect of generating two different signals according to the magnitude of the pressing force is realized;
2. when the membrane bears a first pressure, the membrane switch only generates a first signal; through making first signal circuit and second signal circuit parallelly connected, make under conductor and the second the material of conductor be silver, when the film bears the second pressure, make first signal circuit by the short circuit of second signal circuit inoperative, make membrane switch not produce first signal, only produce the second signal, the technological effect that first signal and second signal produced not simultaneously has been realized, not only the energy consumption is low, can also be through same return circuit output first signal and second signal, and first signal and second signal mutually noninterference, easily distinguish, membrane switch's structure is also simpler, easily use widely.
Drawings
FIG. 1 is a schematic cross-sectional view of the present invention showing only a single air chamber.
Fig. 2 is a schematic sectional view in the direction of a-a in fig. 1.
FIG. 3 is a schematic cross-sectional view taken along the line B-B in FIG. 1 according to an embodiment of the present invention.
FIG. 4 is a schematic cross-sectional view taken along the direction B-B in FIG. 1 according to a second embodiment of the present invention.
Wherein: 10. coating a film; 11. a lower surface; 20. a lower film; 21. an upper surface; 30. a partition plate; 31. a hole wall; 40. an air cavity; 50. an upper conductor; 61. a first lower conductor; 611. an additional resistance; 62. a second lower conductor.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
The up and down directions described in the present invention refer to the up and down directions in fig. 1.
Example one
As shown in fig. 1 to 3, the present invention provides a membrane switch, including: the device comprises a film, a partition plate 30, an air cavity 40, a conductor, a first signal circuit and a second signal circuit, wherein the film comprises an upper film 10 and a lower film 20; the partition plate 30 is arranged between the upper film 10 and the lower film 20, and a through hole penetrating through the partition plate 30 along the up-down direction is formed in the partition plate 30; the air cavity 40 is surrounded by the hole wall 31 of the through hole, the lower surface 11 of the upper film 10 and the upper surface 21 of the lower film 20, and the air cavity 40 is used for providing resilience force required by the upward rebound of the upper film 10; the electric conductors are arranged in the air cavity 40, the electric conductors comprise an upper electric conductor 50 arranged on the lower surface 11 of the upper film 10 and a first lower electric conductor 61 and a second lower electric conductor 62 arranged on the upper surface 21 of the lower film 20, the projections of the first lower electric conductor 61 and the second lower electric conductor 62 on the lower surface 11 of the upper film 10 are both positioned in the area where the upper electric conductor 50 is positioned, when the upper film 10 bears a first pressure, the upper film 10 is sunken downwards, so that the upper electric conductor 50 is in contact with the first lower electric conductor 61 and is separated from the second lower electric conductor 62, and when the upper film 10 bears a second pressure which is greater than the first pressure, the sunken degree of the upper film 10 is increased downwards, so that the upper electric conductor 50 is in contact with both the first lower electric conductor 61 and the second lower electric conductor 62; the first signal circuit comprises an upper conductor 50 and a first lower conductor 61, and the membrane switch generates a first signal through the first signal circuit when the upper conductor 50 is in contact with the first lower conductor 61 and a current passes through the first lower conductor 61; the second signal circuit comprises an upper conductor 50 and a second lower conductor 62, when the upper conductor 50 is in contact with the second lower conductor 62 and current passes through the second lower conductor 62, the membrane switch generates a second signal different from the first signal through the second signal circuit, and the technical effect of generating two different signals according to the magnitude of the pressing force is achieved.
In this embodiment, the first signal circuit is connected in parallel with the second signal circuit, the first lower conductor 61 is made of carbon, the upper conductor 50 and the second lower conductor 62 are made of silver, since the resistance of silver is small and approaches to zero, and the resistance of carbon is much larger than that of silver, so that the first signal circuit is equivalent to a resistor with a certain resistance value, and the second signal circuit is equivalent to a wire with a zero resistance value, when the upper film 10 bears a second pressure to make the upper conductor 50 contact with both the first lower conductor 61 and the second lower conductor 62, the second signal circuit actually short-circuits the first signal circuit, that is, when the upper film 10 bears a second pressure, the first signal circuit is short-circuited by the second signal circuit, no current passes through the first signal circuit, at this time, the membrane switch does not generate the first signal, but current passes through the second signal circuit, there is also a current flow through the second lower conductor 62 and the membrane switch generates a second signal.
The advantage of setting up like this is, when second lower conductor 62 contacts and switches on with last conductor 50, not only played the effect that makes the membrane switch produce the second signal, still played the effect that the first signal circuit of short circuit made the membrane switch can't produce first signal, that is to say, when membrane 10 made the membrane switch produce the signal in the single press, membrane switch or production first signal, or produce the second signal, need not to increase extra part and come the disconnection second signal circuit, can make first signal and second signal not produce simultaneously, not only reduced the energy consumption, also make first signal and second signal mutually noninterference, can export through same return circuit, and easily distinguish, make the structure of membrane switch simpler, easily use widely.
In this embodiment, the upper conductor 50 is circular, and the upper conductor 50 is formed by sintering conductive carbon paste screen-printed on the lower surface 11 of the upper film 10; the shortest distance between the first lower conductor 61 and the axial lead of the air cavity 40 is smaller than the shortest distance between the second lower conductor 62 and the axial lead of the air cavity 40, specifically, the first lower conductor 61 is circular, the second lower conductor 62 is circular with an opening, the second lower conductor 62 surrounds the first lower conductor 61 and is arranged at intervals with the first lower conductor 61, a lead wire connected with the first lower conductor 61 passes through the opening of the second lower conductor 62, the circle centers of the first lower conductor 61 and the second lower conductor 62 are overlapped, the circle center of the first lower conductor 61 is located on the axial lead of the air cavity 40, and the first lower conductor 61 and the second lower conductor 62 are sintered by conductive silver paste screen-printed on the upper surface 21 of the lower film 20.
The advantage that sets up like this lies in, need not to increase extra insulating part, also need not to change current production technology, only need with the thick liquids of printing first lower electric conductor 61 change into the conductive carbon thick liquid can, can smoothly leading-in current production system, it is more convenient when mass production, can also match human finger better and press to last film 10.
The first signal and the second signal in this embodiment are both digital signals, and the partition plate 30 has a plurality of through holes, and the plurality of through holes are arranged at intervals.
The advantage of this arrangement is that the membrane switch can be widely used for assembling various keyboards, and is especially suitable for assembling notebook computer keyboards because of the small number of internal components and light weight, and can adapt to bending.
Example two
As shown in fig. 4, the second embodiment is substantially the same as the first embodiment, except that: in the second embodiment, the first lower conductor 61 is made of silver, the first lower conductor 61 is formed by sintering conductive silver paste printed on the upper surface 21 of the lower film 20, the first signal circuit further includes an additional resistor 611 connected in series with the first lower conductor 61, the resistance of the additional resistor 611 is greater than zero, the additional resistor 611 is arranged on the upper surface 21 of the lower film 20 and is located in the air cavity 40, when the additional resistor 611 is arranged, the lead wire penetrating through the opening of the second lower conductor 62 and connected with the first lower conductor 61 is firstly scraped, and then the additional resistor 611 is welded between two break points of the lead wire.
The advantage of this setting is that can conveniently make a sample without changing the slurry, can test the resistance value of the best effect resistance 611 through changing the resistance 611 of different resistance values, and then apply it in the first embodiment, can simply, swiftly adjust the resistance value of the first electric conductor 61 in the first embodiment to the optimum state, reduce the trial production cost.
According to the membrane switch provided by the invention, the first signal circuit and the second signal circuit are arranged, the first signal and the second signal different from the first signal can be generated according to the magnitude of the pressing force borne by the membrane, the first signal circuit and the second signal circuit are connected in parallel, the first signal circuit is in short circuit when the second signal circuit is conducted, and when the membrane is pressed once, the membrane switch generates the first signal or generates the second signal, so that the energy consumption is reduced, the first signal and the second signal are not interfered with each other, the first signal and the second signal can be output through the same loop and are easy to distinguish, the structure of the membrane switch is simplified, and the membrane switch is easy to popularize and use.
It is noted that, herein, relational terms such as first and second, and the like may be 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.
Claims (9)
1. A membrane switch, comprising:
a film comprising an upper film and a lower film;
the partition plate is arranged between the upper thin film and the lower thin film, and a through hole penetrating through the partition plate is formed in the partition plate;
the air cavity is formed by enclosing the hole wall of the through hole, the lower surface of the upper film and the upper surface of the lower film;
the electric conductor is arranged in the air cavity and comprises an upper electric conductor arranged on the lower surface of the upper film and a first lower electric conductor and a second lower electric conductor arranged on the upper surface of the lower film, when the film bears a first pressure, the upper electric conductor is in contact with the first lower electric conductor and is separated from the second lower electric conductor, and when the film bears a second pressure which is greater than the first pressure, the upper electric conductor is in contact with both the first lower electric conductor and the second lower electric conductor;
a first signal circuit including the upper conductor and the first lower conductor, the membrane switch generating a first signal by the first signal circuit when the upper conductor is in contact with the first lower conductor and a current flows through the first lower conductor;
a second signal circuit including the upper conductor and the second lower conductor, the membrane switch generating a second signal different from the first signal by the second signal circuit when the upper conductor is in contact with the second lower conductor and a current flows through the second lower conductor;
the method is characterized in that:
the first signal circuit and the second signal circuit are connected in parallel, the upper conductor and the second lower conductor are made of silver, the first lower conductor is made of carbon, when the film bears the second pressure, the first signal circuit is short-circuited by the second signal circuit, and the film switch does not generate the first signal.
2. The membrane switch of claim 1, wherein: the first signal circuit further includes an additional resistor in series with the first lower conductor.
3. The membrane switch of claim 2, wherein: the additional resistor is arranged on the upper surface of the lower film and is positioned in the air cavity.
4. The membrane switch of claim 1, wherein: the first signal and the second signal are both digital signals, or the first signal and the second signal are both analog signals.
5. The membrane switch of claim 1, wherein: the conductor is formed by sintering screen-printed slurry.
6. The membrane switch of claim 1, wherein: the shortest distance between the first lower conductor and the axis of the air cavity is smaller than the shortest distance between the second lower conductor and the axis of the air cavity.
7. The membrane switch of claim 1, wherein: the first lower conductor is circular, and the second lower conductor is circular and surrounds the first lower conductor and is provided with an opening.
8. The membrane switch of claim 1, wherein: the air cavity is used for providing resilience force required by the resilience of the film.
9. The membrane switch according to any one of claims 1 to 8, wherein: the through-hole has a plurality ofly, a plurality of the through-hole sets up at interval.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675027.0A CN113257602B (en) | 2021-06-18 | 2021-06-18 | Thin film switch |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110675027.0A CN113257602B (en) | 2021-06-18 | 2021-06-18 | Thin film switch |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113257602A CN113257602A (en) | 2021-08-13 |
| CN113257602B true CN113257602B (en) | 2021-10-01 |
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ID=77188481
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110675027.0A Active CN113257602B (en) | 2021-06-18 | 2021-06-18 | Thin film switch |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113257602B (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05258641A (en) * | 1992-03-16 | 1993-10-08 | Matsushita Electric Ind Co Ltd | Panel switch |
| US7060924B1 (en) * | 2005-01-20 | 2006-06-13 | Kyocera Wireless Corp. | Dual tactility keypad switch |
| CN202601471U (en) * | 2012-05-17 | 2012-12-12 | 苏州达方电子有限公司 | Membrane switch, button and keyboard with membrane switch |
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2021
- 2021-06-18 CN CN202110675027.0A patent/CN113257602B/en active Active
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| Publication number | Publication date |
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| CN113257602A (en) | 2021-08-13 |
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