CN214748555U - Resistance-type pressure sensor with sandwich structure - Google Patents
Resistance-type pressure sensor with sandwich structure Download PDFInfo
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- CN214748555U CN214748555U CN202023349016.3U CN202023349016U CN214748555U CN 214748555 U CN214748555 U CN 214748555U CN 202023349016 U CN202023349016 U CN 202023349016U CN 214748555 U CN214748555 U CN 214748555U
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Abstract
The utility model discloses a resistance-type pressure sensor with a sandwich structure, which comprises a pressure substrate and a supporting substrate which are arranged in parallel relatively; a first electrode is arranged on one side, facing the support substrate, of the pressure substrate, and a second electrode is arranged on one side, facing the pressure substrate, of the support substrate; the first electrode and the second electrode are respectively and electrically connected with an external test resistance circuit; a dielectric film layer is arranged between the first electrode and the second electrode; the dielectric film layer comprises first particles positioned on one side of the first electrode and second particles positioned on one side of the second electrode, and the first particles and the second particles are provided with conductive channels and are uniformly and oppositely arranged; the first electrode and the second electrode are respectively in electric contact with the first particles and the second particles on the same side of the first electrode and the second electrode; elastic dielectric materials are filled between the first particles and the second particles; the utility model discloses a touching is sensitive, accurate induction pressure.
Description
Technical Field
The utility model relates to a sensor technical field especially relates to a resistance-type pressure sensor with sandwich structure.
Background
A touch panel is an input device that allows a user to input information through physical contact with the panel device. Touch panels are commonly used as input devices for various products, such as home appliances, televisions, notebook computers and monitors, and portable electronic devices, such as notebook computers, electronic books, portable multimedia players, global positioning system navigation units, ultra mobile computers, smart phones, smart watches, tablet computers, and mobile communication terminals.
Most touch panels can sense input when capacitively coupled to a conductive touch implement (e.g., a user's finger) through conductive objects within the sensor. And the position of the sensing point on a two-dimensional plane (i.e., on the x-y plane) is recorded by detecting the capacitance change at the sensing point. But the conventional touch panel cannot detect the magnitude of force (i.e., a sensing input in the z-axis direction) when a user presses. Conventional resistive pressure sensors typically do not have touch sensitive characteristics. The user needs to apply a large pressure to activate the sensor, resulting in a poor user experience.
Another problem found in many touch panel technologies is that they lack the ability to track multiple points of contact simultaneously. The most common technique for multi-touch systems is the projected capacitance method. However, the projected capacitance method has some significant limitations. For example, it cannot detect touch input from a non-conductive object (e.g., a plastic pen).
Disclosure of Invention
An object of the utility model is to provide a resistance-type pressure sensor with sandwich structure, this utility model touching is sensitive, accurate induced pressure.
For solving the technical problem, the technical proposal of the utility model is that: a resistive pressure sensor with a sandwich structure comprises a pressure substrate and a support substrate which are arranged in parallel relatively; a first electrode is arranged on one side, facing the support substrate, of the pressure substrate, and a second electrode is arranged on one side, facing the pressure substrate, of the support substrate; the first electrode and the second electrode are respectively and electrically connected with an external test resistance circuit;
a dielectric film layer is arranged between the first electrode and the second electrode; the dielectric film layer comprises first particles positioned on one side of the first electrode and second particles positioned on one side of the second electrode, and the first particles and the second particles are provided with conductive channels and are uniformly and oppositely arranged; the first electrode and the second electrode are respectively in electric contact with the first particles and the second particles on the same side of the first electrode and the second electrode; an elastic dielectric material is filled between the pressure substrate and the support substrate, and the elastic dielectric material wraps the first particles and the second particles.
The further improvement is that the first electrode strip-shaped insulation is arranged on the pressure substrate at intervals; the second electrode strip-shaped insulation intervals are arranged on the supporting substrate; the first electrode and the second electrode are arranged in an intersecting way; the areas where one first electrode and one second electrode are attached to each other form pressure-sensitive cells. The utility model discloses there is insulating clearance between two adjacent first electrodes or between the second electrode. The width of the first electrode or the second electrode is 1mm to 10mm, and the thickness is not more than 200 nm. The first and second electrodes are orthogonally oriented. Under the condition of no external force, the first particles and the second particles are provided with insulation gaps, and the detectable resistance between the first electrode and the second electrode is infinite. Under the action of a force (for example, a user presses a pressure receiving plate with a finger), a part of the first particles and the second particles are connected with each other, a closed loop is formed between the two electrode layers, and a certain resistance can be detected. The larger the force applied, the smaller the resistance detected, thus achieving pressure sensing. The utility model discloses a resistance-type pressure sensor device can also be configured to have among the electronic system of conventional multiple touch detection hardware and software to detect and handle the multiple touch that takes place in the different positions of same time and the pressure of exerting respectively. The utility model discloses an accurate location of a plurality of contact points is realized to the quadrature setting of strip first electrode and strip second electrode. It is further preferable that the width of the insulation gap between the first electrode and the second electrode is 0.1mm to 0.5 mm.
In a further improvement, a first conductive film is arranged between the first electrode and the first particles; and a second conductive film is arranged between the second electrode and the second particles. Strengthen electrically conductive first granule and second granule respectively and pressure base plate and support the charge conduction between through first conductive film and second conductive film, do benefit to the improvement the utility model discloses a reliability.
In a further improvement, the dielectric film layer is uniformly distributed with supports, and the supports are positioned at four corners or four edges of the pressure-sensitive unit. The utility model discloses a supporter improves the sensitive degree that pressure-sensitive unit detected.
Preferably, the support is cylindrical, having a diameter of 0.03mm to 0.1mm and a height of 0.03mm to 0.5 mm.
Preferably, the resistive pressure sensor with a sandwich structure is optically transparent. The utility model discloses can be applied to in the panel or the system that have the light transmissivity requirement.
In a further refinement, the pressure substrate is coated with an optically transparent protective coating; guarantee the utility model discloses have lasting stable luminousness.
In a further improvement, the first electrode and the second electrode are orthogonally arranged.
By adopting the technical scheme, the beneficial effects of the utility model are that:
the utility model discloses under the condition that does not exert external force, the first granule that has electrically conductive channel that corresponds from top to bottom and second granule do not contact each other mutually and insulate, the resistance that can detect between first electrode and the second electrode is infinity;
under the action of force, for example, a user presses the pressure receiving plate through a finger, partial conductive channels are mutually communicated, a closed loop is formed between the first electrode layer and the second electrode layer, and a certain resistance can be detected;
the larger the applied force is, the upper and lower conduction is carried out at the pressing position in sequence, and the number of conductive channels which are conducted is increased, so that the detectable resistance between the first electrode and the second electrode is reduced, and the pressure sensitivity and the pressure sensing accuracy are realized;
the utility model discloses the upper limit of pressure value is less than 15N, and pressure is sensitive.
Thereby achieving the above object of the present invention.
Drawings
Fig. 1 is a schematic structural diagram of a resistive pressure sensor having a sandwich structure according to the present invention;
FIG. 2 is a schematic sectional view of the present invention;
FIG. 3 is a schematic diagram illustrating the operation of the first embodiment of the present invention;
FIG. 4 is an R-F curve of a first embodiment of the present invention;
fig. 5 is a schematic diagram of the first embodiment of the present invention for realizing multi-touch;
FIG. 6 is a schematic view of the operation principle of the second embodiment of the present invention;
FIG. 7 is a schematic view of the operation principle of the third embodiment of the present invention;
fig. 8 is a schematic view of the working principle of the fourth embodiment of the present invention.
In the figure:
a pressure substrate 1; a support substrate 2; a first electrode 3; a second electrode 4; a dielectric film layer 5; first particles 51; the second particles 52; an elastic dielectric material 53; a support 54; a protective coating 8.
Detailed Description
In order to further explain the technical solution of the present invention, the present invention is explained in detail by the following embodiments.
The present embodiment discloses a resistive pressure sensor with a sandwich structure, as shown in fig. 1 to 5, including a pressure substrate 1 and a support substrate 2 arranged in parallel; a first electrode 3 is arranged on one side of the pressure substrate 1 facing the support substrate 2, and a second electrode 4 is arranged on one side of the support substrate 2 facing the pressure substrate 1; the first electrode 3 and the second electrode 4 are respectively and electrically connected with an external test resistance circuit;
a dielectric film layer 5 is arranged between the first electrode 3 and the second electrode 4; the dielectric film layer 5 comprises first particles 51 positioned on one side of the first electrode 3 and second particles 52 positioned on one side of the second electrode 4, and the first particles 51 and the second particles 52 are provided with conductive channels and are uniformly and oppositely arranged; the first electrode 3 and the second electrode 4 are in electrical contact with the first particles 51 and the second particles 52, respectively, on the same side thereof; an elastic dielectric material 53 is filled between the pressure substrate 1 and the support substrate 2, and the elastic dielectric material 53 wraps the first particles 51 and the second particles 52. In the case of receiving the external pressure, the first particles 51 and the second particles 52 having conductive paths corresponding to each other at the top and bottom are not in contact with each other and insulated from each other, and the detectable resistance between the first electrode 3 and the second electrode 4 is infinite; under the action of force (for example, a user presses the pressure receiving plate through a finger), partial conductive channels are mutually communicated, a closed loop is formed between the first electrode 3 layer and the second electrode 4 layer, and a certain resistance can be detected; the larger the applied force is, the pressing positions are successively conducted up and down, and as the number of conducting channels which are conducted is increased, the detectable resistance between the first electrode 3 and the second electrode 4 is reduced, so that pressure sensitivity and accurate pressure sensing are realized, as shown in fig. 4, the upper limit value of the pressure in the embodiment is smaller than 15N, and the pressure is sensitive. As shown in fig. 5, the present embodiment can be used to implement multi-touch.
In the embodiment, the first electrodes 3 are arranged on the pressure substrate 1 at intervals in a strip-shaped insulating manner; the second electrodes 4 are arranged on the support substrate 2 at intervals in a strip-shaped insulating manner; the first electrode 3 and the second electrode 4 are orthogonally arranged; the areas where one first electrode 3 and one second electrode 4 are attached to each other form pressure-sensitive cells. In this embodiment, an insulating gap is formed between two adjacent first electrodes 3 or between two adjacent second electrodes 4. The width of the first electrode 3 or the second electrode 4 is 1mm to 10mm, and the thickness is not more than 200 nm. The first electrode 3 and the second electrode 4 are orthogonally oriented. In the case of external pressure, the first particles 51 and the second particles 52 have an insulating gap therebetween, and the detectable resistance between the first electrode 3 and the second electrode 4 is infinite. Under the action of a force (e.g. a user pressing a pressure receiving plate with a finger), a part of the first particles 51 and the second particles 52 are connected to each other, a closed loop is formed between the two electrode layers, and a certain resistance can be detected. The larger the force applied, the smaller the resistance detected, thus achieving pressure sensing. The resistive pressure sensor apparatus of the present embodiments can also be configured into an electronic system with conventional multi-touch detection hardware and software to detect and process multi-touches and separately applied pressures occurring at different locations at the same time. The embodiment realizes accurate positioning of a plurality of contact points through the orthogonal arrangement of the strip-shaped first electrode 3 and the strip-shaped second electrode 4. It is further preferable that the width of the insulation gap between the first electrode 3 and the second electrode 4 is 0.1mm to 0.5 mm.
In this embodiment, the first conductive film 6 is provided between the first electrode 3 and the first particles 51; a second conductive film 7 is provided between the second electrode 4 and the second particles 52. The first conductive film 6 and the second conductive film 7 enhance the charge conduction between the conductive first particles 51 and the conductive second particles 52 and the pressure substrate 1 and the support substrate 2, respectively, which is beneficial to improving the reliability of the use of the present embodiment.
In this embodiment, the supports 54 are uniformly distributed in the dielectric film layer 5, and the supports 54 are located at four corners or four sides of the pressure-sensitive unit. The present embodiment increases the sensitivity of the pressure sensitive unit detection by the support 54.
The support 54 in this embodiment is cylindrical, and the support 54 has a diameter of 0.03mm to 0.1mm and a height of 0.03mm to 0.5 mm.
The resistive pressure sensor with the sandwich structure in this embodiment is optically transparent. The embodiment can be applied to a panel or a system with light transmission requirements.
The pressure substrate 1 in this embodiment is coated with an optically transparent protective coating 8; the embodiment is ensured to have lasting and stable light transmittance.
In one pressure-sensitive cell of this embodiment, the first particles 51 and the second particles 52 are arranged at equal heights.
The conductive paths of the first particles 51 and the second particles 52 have different resistances. In the case where no external force is applied, the first particles 51 and the second particles 52 each have an insulating gap therebetween, and the detectable resistance between the two electrode layers is infinite. The pressing force base plate, the higher electrically conductive passageway of resistance can realize the switching on of upper and lower electrode layer under dabbing, forms closed circuit between two electrode layers, can detect certain resistance. When the pressing force is increased, the conductive channels with lower resistance are sequentially conducted up and down. As the number of conducting channels increases, the detectable resistance between the two electrode layers decreases. The conductive path resistance can be distributed according to a certain rule or randomly by taking the area where the conductive paths in the upper electrode layer and the lower electrode layer intersect as a unit. The resistance between the upper electrode layer and the lower electrode layer under different pressures can be adjusted by adjusting the resistance of the conductive channel, so that pressure sensing is realized.
The second embodiment of the present invention is shown in fig. 6: the first particles 51 and the second particles 52 having the conductive paths have different heights along the z-axis (the direction perpendicular to the pressure receiving surface). In the case where no external force is applied, the first particles 51 and the second particles 52 each have an insulating gap therebetween, and the detectable resistance between the two electrode layers is infinite. The pressure substrate is pressed, the higher conductive channel can realize the conduction of the upper electrode layer and the lower electrode layer under the light touch, a closed loop is formed between the two electrode layers, and a certain resistance can be detected. When the pressing force is increased, the shorter conductive channels are sequentially conducted up and down. As the number of conducting channels increases, the detectable resistance between the two electrode layers decreases. The area where the conducting paths in the upper electrode layer and the lower electrode layer are intersected is taken as a unit, and the height distribution of the conducting paths along the z axis can be distributed according to a certain rule or can be randomly distributed. The conductive channel which is connected up and down under different pressures can be adjusted by adjusting the height of the conductive channel along the z axis, so that pressure sensing is realized.
The third embodiment of the present invention is shown in fig. 7:
in this embodiment, the plurality of conductive paths in the pressure-sensitive composite material are different in the ease of contact from top to bottom. In the case where no external force is applied, the first particles 51 and the second particles 52 each have an insulating gap therebetween, and the detectable resistance between the two electrode layers is infinite. When the pressure substrate is pressed, the conductive channel which is most easily contacted can realize the conduction of the upper electrode layer and the lower electrode layer under the light touch, a closed loop is formed between the two electrode layers, and a certain resistance can be detected. When the pressing force is increased, the conduction channels with higher contact difficulty are conducted up and down successively. As the number of conducting channels increases, the detectable resistance between the two electrode layers decreases. The ease of adjusting the contact of the upper and lower conductive vias can be accomplished by, but is not limited to, controlling the contact area between the upper and lower conductive vias, or the structural or modulus change of the dielectric matrix material. The area where the conducting paths in the upper electrode layer and the lower electrode layer intersect is taken as a unit, and the difficulty degree of the up-and-down contact of the conducting paths can be distributed according to a certain rule or can be randomly distributed. The resistance between the upper electrode layer and the lower electrode layer under different pressures can be adjusted by adjusting the difficulty of the upper-lower contact of the conductive channel, so that the pressure sensing is realized.
The fourth embodiment of the present invention is shown in fig. 8:
the first particles 51 and the second particles 52 have different modulus (hardness) distributions of the elastic dielectric material. In the case where no external force is applied, the first particles 51 and the second particles 52 each have an insulating gap therebetween, and the detectable resistance between the two electrode layers is infinite. When the pressure substrate is pressed, the conduction of the upper electrode layer and the lower electrode layer can be realized by the conductive channel around the elastic dielectric material with the minimum modulus (the softest) under the condition of light touch, a closed loop is formed between the two electrode layers, and a certain resistance can be detected. As the force of the press increases, the conductive paths around the higher modulus (stiffer) elastomeric dielectric material conduct up and down in succession. As the number of conducting channels increases, the detectable resistance between the two electrode layers decreases. Adjusting the modulus distribution of the elastic dielectric material can be accomplished by, but is not limited to, controlling the degree of polymerization of the elastic dielectric material in different regions. The area where the conducting paths in the upper electrode layer and the lower electrode layer intersect is taken as a unit, and the modulus change of the elastic dielectric material can be distributed according to a certain rule or can be randomly distributed. By adjusting the modulus change of the elastic dielectric material, the resistance between the upper electrode layer and the lower electrode layer under different pressures can be adjusted, thereby realizing pressure sensing.
The above embodiments and drawings are not intended to limit the forms and modes of the present embodiments, and any suitable changes or modifications thereof by those skilled in the art should be considered as not departing from the scope of the present embodiments.
Claims (8)
1. A resistive pressure sensor having a sandwich structure, characterized by: the device comprises a pressure substrate and a support substrate which are arranged in parallel relatively; a first electrode is arranged on one side, facing the support substrate, of the pressure substrate, and a second electrode is arranged on one side, facing the pressure substrate, of the support substrate; the first electrode and the second electrode are respectively and electrically connected with an external test resistance circuit;
a dielectric film layer is arranged between the first electrode and the second electrode; the dielectric film layer comprises first particles positioned on one side of the first electrode and second particles positioned on one side of the second electrode, and the first particles and the second particles are provided with conductive channels and are uniformly and oppositely arranged; the first electrode and the second electrode are respectively in electric contact with the first particles and the second particles on the same side of the first electrode and the second electrode; an elastic dielectric material is filled between the pressure substrate and the support substrate, and the elastic dielectric material wraps the first particles and the second particles.
2. The resistive pressure sensor having a sandwich structure of claim 1, wherein: the first electrode strip-shaped insulation intervals are arranged on the pressure substrate; the second electrode strip-shaped insulation intervals are arranged on the supporting substrate; the first electrode and the second electrode are arranged in an intersecting way; the areas where one first electrode and one second electrode are attached to each other form pressure-sensitive cells.
3. The resistive pressure sensor having a sandwich structure of claim 1, wherein: a first conductive film is arranged between the first electrode and the first particles; and a second conductive film is arranged between the second electrode and the second particles.
4. The resistive pressure sensor having a sandwich structure of claim 2, wherein: and supports are uniformly distributed in the dielectric film layer and are positioned at four corners or four edges of the pressure-sensitive unit.
5. The resistive pressure sensor having a sandwich structure of claim 4, wherein: the support is cylindrical, and the diameter of the support is 0.03mm to 0.1mm, and the height of the support is 0.03mm to 0.5 mm.
6. The resistive pressure sensor having a sandwich structure of claim 1, wherein: the resistive pressure sensor with a sandwich structure is optically transparent.
7. The resistive pressure sensor having a sandwich structure of claim 1, wherein: the pressure substrate is coated with an optically clear protective coating.
8. A resistive pressure sensor having a sandwich structure according to any one of claims 1 to 7, wherein: the first electrode and the second electrode are orthogonally arranged.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023349016.3U CN214748555U (en) | 2020-12-31 | 2020-12-31 | Resistance-type pressure sensor with sandwich structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023349016.3U CN214748555U (en) | 2020-12-31 | 2020-12-31 | Resistance-type pressure sensor with sandwich structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022143073A1 (en) * | 2020-12-31 | 2022-07-07 | 瑞态常州高分子科技有限公司 | Dielectric film layer, preparation method and application |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022143073A1 (en) * | 2020-12-31 | 2022-07-07 | 瑞态常州高分子科技有限公司 | Dielectric film layer, preparation method and application |
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