CN210154592U - Capacitive sensor without capacitive element - Google Patents
Capacitive sensor without capacitive element Download PDFInfo
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- CN210154592U CN210154592U CN201920672259.9U CN201920672259U CN210154592U CN 210154592 U CN210154592 U CN 210154592U CN 201920672259 U CN201920672259 U CN 201920672259U CN 210154592 U CN210154592 U CN 210154592U
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/14—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
- G01D5/24—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage by varying capacitance
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Abstract
The utility model provides a capacitanc sensor of no capacitive element belongs to sensor technical field. The capacitance type sensor solves the technical problems that the existing capacitance type sensor has errors among capacitance value individuals under the same hardware condition, and the capacitance value of a capacitance element is continuously changed along with the temperature change, so that the sensitivity of the sensor is unstable. The capacitive sensor without the capacitive element comprises a first copper sheet and a second copper sheet which are respectively and tightly fixed on the top surface and the bottom surface of a substrate, wherein the upper side surface of the first copper sheet is tightly arranged on the lower side surface of a non-conductor trigger piece; the first copper sheet and the second copper sheet are respectively electrically connected with the chip. The capacitive sensor obtains better and stable sensing precision while reducing the dependence on elements (namely capacitance), the sensing precision cannot be changed due to different application environments, the consistency is always kept, and the stability is strong.
Description
Technical Field
The utility model belongs to the technical field of the sensor, refer in particular to a capacitanc sensor of no capacitive element.
Background
At present, the conventional capacitive sensor sets the sensing sensitivity (sensing distance) according to the capacitance of the capacitive element on the circuit under the condition that other hardware is the same. However, such capacitive sensors suffer from two insurmountable drawbacks under the same hardware conditions: 1. errors exist among capacitance value individuals; 2. the capacitance value of the same capacitor element will change with the temperature change, and it is impossible to keep the same sensing sensitivity (sensing distance) under various temperature conditions under the same hardware condition. This leads to the problem that the capacitive sensor must have a certain percentage of no or long sensing, and this problem is an unamenable category.
Disclosure of Invention
The utility model aims at providing a do not receive the capacitive sensor that temperature influence, stability and precision are higher.
The purpose of the utility model is realized like this:
the capacitive sensor without the capacitive element is characterized by comprising a first copper sheet and a second copper sheet which are respectively and tightly fixed on the top surface and the bottom surface of a substrate, wherein the volume of the first copper sheet is larger than, equal to or smaller than that of the second copper sheet, the upper side surface of the first copper sheet is tightly arranged on the lower side surface of a non-conductor trigger piece, and the first copper sheet and the second copper sheet are respectively and electrically connected with a chip.
In the capacitive sensor, the non-conductor trigger part is made of a non-conductor medium, the top surface and the bottom surface of the first copper sheet and the second copper sheet are relatively arranged, so long as the first copper sheet and the non-conductor trigger part are assembled in a clinging manner, and a finger or a similar grounded conductor can be used for triggering through the non-conductor trigger part when the capacitive sensor is used; the utility model discloses a sensitivity (response distance) is adjusted with the distance of trigger point to the proportion of first copper sheet and second copper sheet volume on the base plate or first copper sheet and second copper sheet, need not realize the response function through the mode that increases capacitive element on the circuit, its response sensitivity (response distance) does not receive the influence of temperature, precision and stability are higher, but this capacitive sensor wide application in intelligent toilet seat's the response of landing, the liquid level response of products such as water dispenser and other traditional capacitive touch-control inductors application's field.
In the capacitive sensor without the capacitive element, the thickness of the first copper sheet is the same as that of the second copper sheet, and the area of the first copper sheet is larger than, equal to or smaller than that of the second copper sheet.
In the capacitive sensor without the capacitive element, the capacitive sensor includes a housing made of a non-conductor material, the substrate, the first copper sheet and the second copper sheet are disposed in the housing, and an upper side surface of the first copper sheet is closely attached to an inner side surface of an upper end of the housing. The design of the sealing shell can avoid the change of the humidity/composition/air pressure in the outside air to cause the change of the dielectric constant of the air contacted with the first copper sheet and the second copper sheet during production, ensure that the dielectric constant of the air in the shell is not influenced by the outside environment, isolate water vapor, be favorable for keeping the stability of the capacitive sensor and improve the precision of the capacitive sensor.
In the capacitive sensor without the capacitive element, the housing is filled with dry air or other substances close to or larger than the dielectric constant of air.
In the capacitive sensor without the capacitive element, two pins of the chip are respectively and electrically connected with the first copper sheet and the second copper sheet through wires, and when the capacitance value of the first copper sheet is larger than that of the second copper sheet, the chip outputs high electrical frequency; when the capacitance value of the first copper sheet is smaller than that of the second copper sheet, the chip outputs low electric frequency. The capacitance value of the first copper sheet is epsilon, Sa/da; the capacitance value of the second copper sheet is epsilon, Sb/db; wherein epsilon is the dielectric constant of the material; sa is the area of the first copper sheet; da is the distance from the first copper sheet to the trigger point; sb is the area of the second copper sheet; db distance of the second copper sheet to the trigger point.
In the capacitance sensor without the capacitance element, the housing includes an upper cover and a bottom case, the upper cover and the bottom case enclose a closed accommodating cavity, the substrate, the first copper sheet and the second copper sheet are disposed in the accommodating cavity, an upper side surface of the first copper sheet is tightly attached to and fixed on an inner side surface of the upper cover, the substrate is connected with an electric wire, and the electric wire extends out from a joint of the upper cover and the bottom case and is hermetically connected with the molded housing.
As another scheme, the casing is including upper cover and the drain pan that can seal fixedly, the base plate is located between upper cover and the drain pan, the medial surface that is fixed in the upper cover is hugged closely to the side of going up of first copper sheet, be provided with two baffles with the space separation of base plate downside left cavity, well cavity and right cavity on the drain pan, two the upper end of baffle all with the downside sealing connection of base plate, drain pan, base plate and two baffles have enclosed confined well cavity, the second copper sheet is located in the well cavity, be provided with the opening with right cavity intercommunication on the drain pan.
As another scheme, the shell comprises an upper cover with an opening at the lower end, the first copper sheet, the substrate and the second copper sheet are sequentially arranged from top to bottom, the upper side surface of the first copper sheet is tightly attached to the lower side surface of the upper cover, and the first copper sheet, the substrate and the second copper sheet are cast on the upper cover through insulating gel with the dielectric constant larger than that of air.
In the capacitive sensor without a capacitive element, the non-conductive trigger is formed by at least one layer of non-conductive material.
The working principle is as follows:
from the capacitance point of view, C ═ ε S/d (ε is the dielectric constant of the medium between the plates, S is the plate area, d is the distance between the plates)
In this embodiment:
C0＝ε0·S0/d0(ii) a (wherein, C0Is the capacitance value of the first copper sheet, S0Is the area of the first copper sheet, d0Is the first copper sheet thickness)
C1＝ε1·S1/d1(ii) a (wherein, C1Is the capacitance value of the upper cover connected with the first copper sheet, S1The area of the upper cover connected with the first copper sheet, d1For upper coverThickness)
C2＝ε2·S2/d2(ii) a (wherein, C2Is the capacitance value of a non-conductive trigger, S2The area of the non-conductor trigger part corresponding to the first copper sheet, d2Thickness of the non-conductive trigger member)
C3＝ε3·S3/d3(ii) a (wherein, C3Is the capacitance value of air, S3Is the area of air corresponding to the first copper sheet, when not triggered3＝∞)
1/C is 1/C through a multi-capacitor series connection formula1+1/C2+·+1/CnThe following can be obtained:
when not triggered, the total capacitance value of the first copper sheet in series connection is as follows: 1/C-1/C0+1/C1+1/C2+1/C3When triggered, the total capacitance value of the series connection on the first copper sheet is as follows: 1/C-1/C0+1/C1+1/C2。
In the same way, the total capacitance value on the second copper sheet is always kept constant, and the chip judges whether triggering exists or not by detecting and comparing the change of the total capacitance values of the first copper sheet and the second copper sheet. (at present, the sensors are connected with a capacitor element to form effective triggering, namely control sensitivity, but the capacitance value of a capacitor element changes along with the temperature, so that the sensors cannot sense or malfunction, and the second copper sheet adopted to replace the capacitor element cannot change the capacitance value to cause the failure or malfunction of the sensors at present.)
From the perspective of an electric field and electric charges, because the first copper sheet and the second copper sheet are connected with pins of the chip through wires, when the chip works, the surfaces of the first copper sheet and the second copper sheet can form the electric field due to the fact that the first copper sheet and the second copper sheet are connected with electricity, and under the normal condition, because the area of the first copper sheet is larger than that of the second copper sheet, the capacitance value of the first copper sheet is larger than that of the second copper sheet, high electric frequency is output, and the chip is not triggered; when a finger or a conductor similar to the ground is triggered through a non-conductor trigger piece, an electric field formed on the surface of the first copper sheet is damaged, partial charges are lost, namely the first copper sheet discharges outwards, so that the capacitance value of the first copper sheet is reduced, the charge loss of the second copper sheet is small due to the long distance, the capacitance value is almost unchanged, and when the capacitance value of the first copper sheet is reduced to be lower than that of the second copper sheet, low electric frequency is output, and the chip is triggered; in the triggering process, a larger contact area is needed between a finger or a conductor similar to the ground and a non-conductor triggering part, further, if the non-conductor triggering part is thicker, when the finger triggers through the non-conductor triggering part, because the distance is too large, the charge loss is less, and the situation that the finger is touched and cannot sense can occur, the area of the first copper sheet needs to be increased at this time, the electric field intensity of the first copper sheet is improved, so that more charge loss can be caused even though the non-conductor triggering part is thicker, the capacitance reduction value of the first copper sheet can be detected by the chip, the sensing sensitivity of the capacitive sensor is improved, and certainly, when the area of the first copper sheet is changed, the area of the second copper sheet needs to be changed adaptively; similarly, when the thickness of the non-conductor trigger piece is smaller, the areas of the first copper sheet and the second copper sheet can be reduced adaptively to reduce the induction sensitivity; in conclusion, the capacitive sensor can adjust the sensing sensitivity by adjusting the thickness of the non-conductor trigger piece and the areas of the first copper sheet and the second copper sheet according to the needs.
Compared with the prior art, the utility model outstanding and profitable technological effect is:
the utility model discloses a capacitanc temperature sensor when reducing the reliance to the component (electric capacity promptly), has obtained better response precision, and this response precision can not receive the application environment difference and produce the change, keeps the uniformity forever, and stability is strong.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention.
Fig. 2 is a side view structural diagram of the present invention.
Fig. 3 is a schematic structural diagram of the housing of the present invention.
Fig. 4 is a schematic structural diagram of another embodiment of the housing of the present invention.
Fig. 5 is a schematic diagram of a multi-capacitor series connection according to the present invention.
In the figure, 1, a substrate; 2. a first copper sheet; 3. a second copper sheet; 4. a non-conductive trigger; 5. a housing; 6. air; 7. an upper cover; 8. a bottom case; 9. an electric wire; 10. a partition plate; 11. a left chamber; 12. a middle chamber; 13. and a right chamber.
Detailed Description
The invention will be further described with reference to specific embodiments in conjunction with the accompanying drawings, see fig. 1-5:
the capacitive sensor without the capacitive element comprises a first copper sheet 2 and a second copper sheet 3 which are respectively and tightly fixed on the top surface and the bottom surface of a substrate 1, wherein the volume of the first copper sheet 2 is larger than, equal to or smaller than the volume of the second copper sheet 3, the upper side surface of the first copper sheet 2 is tightly arranged on the lower side surface of a non-conductor trigger part 4, and the first copper sheet 2 and the second copper sheet 3 are respectively and electrically connected with a chip; the thickness of the first copper sheet 2 is the same as that of the second copper sheet 3, and the area of the first copper sheet 2 is larger than, equal to or smaller than that of the second copper sheet 3; the non-conductive trigger 4 is formed by at least one layer of non-conductive material. The non-conductor trigger 4 in the capacitive sensor is made of a non-conductor medium, the top surface and the bottom surface of the first copper sheet 2 and the second copper sheet 3 are arranged relatively, as long as the first copper sheet 2 is assembled with the non-conductor trigger 4 in a clinging manner, and when the capacitive sensor is used, a finger or a similar grounded conductor can be used for triggering through the non-conductor trigger 4; the utility model discloses a sensitivity (sensing distance) is adjusted to the proportion of first copper sheet 2 and the 3 volume of second copper sheet or the distance of first copper sheet 2 and second copper sheet 3 and trigger point on the base plate 1, need not realize the response function through the mode that increases capacitive element on the circuit, its sensing sensitivity (sensing distance) is not influenced by the temperature, precision and stability are higher, this capacitive sensor can be widely used in the landing response of intelligent closestool seat circle, the liquid level response of products such as water dispenser and other traditional capacitive touch sensor application's field; the utility model discloses a capacitanc temperature sensor when reducing the reliance to the component (electric capacity promptly), has obtained better response precision, and this response precision can not receive the application environment difference and produce the change, keeps the uniformity forever, and stability is strong.
As shown in fig. 2 and fig. 3, the capacitive sensor includes a housing 5 made of a non-conductor material, the substrate 1, the first copper sheet 2 and the second copper sheet 3 are disposed in the housing 5, and the upper side of the first copper sheet 2 is closely attached to the inner side of the upper end of the housing 5; the shell 5 is filled with dry air 6 or other substances with the dielectric constant close to or larger than that of the air 6; two pins of the chip are respectively and electrically connected with the first copper sheet 2 and the second copper sheet 3 through wires 9, and when the capacitance value of the first copper sheet 2 is larger than that of the second copper sheet 3, the chip outputs high electrical frequency; when the capacitance value of the first copper sheet 2 is smaller than that of the second copper sheet 3, the chip outputs low electric frequency. The design of the sealing shell 5 can avoid the change of the dielectric constant of the air 6 contacted with the first copper sheet 2 and the second copper sheet 3 during production caused by the change of the humidity/composition/air pressure in the outside air 6, ensure that the dielectric constant of the air 6 in the shell 5 is not influenced by the outside environment, isolate water vapor, be beneficial to keeping the stability of the capacitive sensor and improve the precision of the capacitive sensor; the capacitance value of the first copper sheet 2 is epsilon, Sa/da; the capacitance value of the second copper sheet 3 is epsilon, Sb/db; wherein epsilon is the dielectric constant of the material; sa is the area of the first copper sheet 2; da is the distance from the first copper sheet 2 to the trigger point; sb is the area of the second copper sheet 3; db distance of the second copper sheet 3 to the trigger point.
Further, the housing 5 comprises an upper cover 7 and a bottom case 8, the upper cover 7 and the bottom case 8 enclose a closed accommodating cavity, the substrate 1, the first copper sheet 2 and the second copper sheet 3 are arranged in the accommodating cavity, the upper side surface of the first copper sheet 2 is tightly attached to and fixed on the inner side surface of the upper cover 7, the substrate 1 is connected with an electric wire 9, and the electric wire 9 extends out from the joint of the upper cover 7 and the bottom case 8 and is hermetically connected with the molded housing 5.
As another scheme, casing 5 is including upper cover 7 and the drain pan 8 that can seal fixedly, base plate 1 locates between upper cover 7 and the drain pan 8, the medial surface that is fixed in upper cover 7 is hugged closely to the side of going up of first copper sheet 2, be provided with two baffles 10 with the space separation of base plate 1 downside left cavity 11, well cavity 12 and right cavity 13 on the drain pan 8, two the upper end of baffle 10 all with the downside sealing connection of base plate 1, drain pan 8, base plate 1 and two baffles 10 have enclosed into confined well cavity 12, second copper sheet 3 locates in well cavity 12, be provided with the opening with right cavity 13 intercommunication on the drain pan 8.
As another scheme, the housing 5 includes an upper cover 7 with an opening at a lower end, the first copper sheet 2, the substrate 1 and the second copper sheet 3 are sequentially arranged from top to bottom, an upper side surface of the first copper sheet 2 is closely attached to a lower side surface of the upper cover 7, and the first copper sheet 2, the substrate 1 and the second copper sheet 3 are cast on the upper cover 7 through an insulating gel with a dielectric constant greater than that of the air 6.
From the capacitance point of view, C ═ ε S/d (ε is the dielectric constant of the medium between the plates, S is the plate area, d is the distance between the plates)
In this embodiment:
C0＝ε0·S0/d0(ii) a (wherein, C0Is the capacitance value, S, of the first copper sheet 20Is the area of the first copper sheet 2, d0Is a first copper sheet 2 thickness)
C1＝ε1·S1/d1(ii) a (wherein, C1Is the capacitance value, S, of the upper cover 7 connected to the first copper sheet 21The area of the upper cover 7 connected to the first copper sheet 2, d1Thickness of upper cover 7)
C2＝ε2·S2/d2(ii) a (wherein, C2Is the capacitance value, S, of the non-conductive trigger 42The area of the non-conductor trigger part 4 corresponding to the first copper sheet 2, d2Being thickness of non-conductor trigger 4)
C3＝ε3·S3/d3(ii) a (wherein, C3Is the capacitance value of air 6, S3Is the area of the air 6 corresponding to the first copper sheet 2, when not triggered, d3＝∞)
1/C is 1/C through a multi-capacitor series connection formula1+1/C2+·+1/CnThe following can be obtained:
when not triggered, the total capacitance value of the first copper sheet 2 connected in series is as follows: 1/C-1/C0+1/C1+1/C2+1/C3Touch and touchThe total capacitance value of the series connection on the first copper sheet 2 is as follows: 1/C-1/C0+1/C1+1/C2。
In the same way, the total capacitance value on the second copper sheet 3 is always kept constant, and the chip judges whether triggering exists or not by detecting and comparing the change of the total capacitance values of the first copper sheet 2 and the second copper sheet. (at present, the sensors are connected with a capacitor element to form effective triggering, namely control sensitivity, but the capacitance value of a capacitor element changes along with the temperature, so that the sensors cannot sense or malfunction, and the second copper sheet 3 in the scheme is adopted to replace the capacitor element, so that the sensor cannot fail or malfunction due to capacitance value change.)
From the perspective of an electric field and electric charges, because the first copper sheet 2 and the second copper sheet 3 are connected with pins of the chip through the wires 9, when the chip works, the surfaces of the first copper sheet 2 and the second copper sheet 3 can form the electric field due to the fact that the surfaces of the first copper sheet 2 and the second copper sheet 3 are connected with electricity, and under normal conditions, as the area of the first copper sheet 2 is larger than that of the second copper sheet 3, the capacitance value of the first copper sheet 2 is larger than that of the second copper sheet 3, high electric frequency is output, and the chip is not triggered; when a finger or a similar grounded conductor is triggered through the non-conductor triggering part 4, an electric field formed on the surface of the first copper sheet 2 is damaged, partial charges are lost, namely the first copper sheet 2 discharges outwards, so that the capacitance value of the first copper sheet 2 is reduced, the charge loss of the second copper sheet 3 is small due to the long distance, the capacitance value is almost unchanged, and when the capacitance value of the first copper sheet 2 is reduced to be lower than that of the second copper sheet 3, low electric frequency is output, and the chip is triggered; in the triggering process, a larger contact area is needed between a finger or a conductor similar to the ground and the non-conductor triggering part 4, further, if the non-conductor triggering part 4 is thicker, and when the finger triggers through the non-conductor triggering part 4, because the distance is too large, the charge loss is less, and the situation that the finger is touched and cannot sense can occur, the area of the first copper sheet 2 needs to be increased at this time, the electric field intensity of the first copper sheet is improved, so that even though the non-conductor triggering part 4 with the thicker distance is also provided with more charge loss, the capacitance reduction value of the first copper sheet 2 can be detected by the chip, and the sensing sensitivity of the capacitive sensor is improved, of course, when the area of the first copper sheet 2 is changed, the area of the second copper sheet 3 needs to be changed adaptively; similarly, when the thickness of the non-conductor trigger 4 is smaller, the areas of the first copper sheet 2 and the second copper sheet 3 can be adaptively reduced to reduce the sensing sensitivity; in conclusion, the capacitive sensor can adjust the sensing sensitivity by adjusting the thickness of the non-conductor trigger 4 and the areas of the first copper sheet 2 and the second copper sheet 3 according to requirements.
The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.
Claims (9)
1. The capacitive sensor without the capacitive element is characterized by comprising a first copper sheet (2) and a second copper sheet (3) which are tightly attached to the top surface and the bottom surface of a fixed substrate (1) respectively, wherein the upper side surface of the first copper sheet (2) is tightly attached to the lower side surface of a non-conductor trigger part (4), and the first copper sheet (2) and the second copper sheet (3) are electrically connected with a chip respectively.
2. A capacitive sensor without a capacitive element as in claim 1, wherein: the thickness of the first copper sheet (2) is the same as that of the second copper sheet (3).
3. A capacitive sensor without a capacitive element as in claim 1, wherein: the capacitive sensor comprises a shell (5) made of a non-conductor material, the substrate (1), the first copper sheet (2) and the second copper sheet (3) are arranged in the shell (5), and the upper side surface of the first copper sheet (2) is tightly attached to and fixed on the inner side surface of the upper end of the shell (5).
4. A capacitive sensor without capacitive elements as claimed in claim 3, wherein: the shell (5) is filled with dry air (6) or other non-conductive substances which are close to or larger than the dielectric constant of the air (6).
5. The capacitive sensor without capacitive element of any of claims 1-4, wherein: the two pins of the chip are respectively and electrically connected with the first copper sheet (2) and the second copper sheet (3) through wires (9), and when the capacitance value of the first copper sheet (2) is smaller than that of the second copper sheet (3), the chip outputs high electrical frequency; when the capacitance value of the first copper sheet (2) is larger than that of the second copper sheet (3), the chip outputs low electric frequency.
6. A capacitive sensor without capacitive elements according to claim 3 or 4, characterized in that: the shell (5) comprises an upper cover (7) and a bottom shell (8), the upper cover (7) and the bottom shell (8) enclose a closed accommodating cavity, the substrate (1), the first copper sheets (2) and the second copper sheets (3) are arranged in the accommodating cavity, the upper side faces of the first copper sheets (2) are tightly attached to the inner side faces of the upper cover (7), the substrate (1) is connected with an electric wire (9), and the electric wire (9) extends out of the joint of the upper cover (7) and the bottom shell (8) and is connected with the formed shell (5) in a sealing mode.
7. A capacitive sensor without capacitive elements according to claim 3 or 4, characterized in that: casing (5) are including upper cover (7) and drain pan (8) that can seal fixedly, base plate (1) is located between upper cover (7) and drain pan (8), the medial surface that is fixed in upper cover (7) is hugged closely to the side of going up of first copper sheet (2), be provided with on drain pan (8) with two baffles (10) of space separation left cavity (11), well cavity (12) and right cavity (13) of base plate (1) downside sealing connection, two the upper end of baffle (10) all with the downside sealing connection of base plate (1), drain pan (8), base plate (1) and two baffles (10) have enclosed confined well cavity (12), second copper sheet (3) are located in well cavity (12), be provided with the opening with right cavity (13) intercommunication on drain pan (8).
8. A capacitive sensor without capacitive elements according to claim 3 or 4, characterized in that: casing (5) include lower extreme open-ended upper cover (7), first copper sheet (2), base plate (1) and second copper sheet (3) from the top down set gradually, the downside in upper cover (7) is hugged closely to the side of going up of first copper sheet (2), base plate (1) and second copper sheet (3) are fixed in on upper cover (7) through the insulating gel casting that dielectric constant is greater than the air.
9. The capacitive sensor without capacitive element of any of claims 1-4, wherein: the non-conductive trigger (4) is formed by at least one non-conductive material layer.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2018207063471 | 2018-05-11 | ||
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| CN210154592U true CN210154592U (en) | 2020-03-17 |
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| CN201910390123.3A Pending CN110132319A (en) | 2018-05-11 | 2019-05-10 | A kind of capacitance type sensor of no capacity cell |
| CN201920672259.9U Active CN210154592U (en) | 2018-05-11 | 2019-05-10 | Capacitive sensor without capacitive element |
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| CN110132319A (en) * | 2018-05-11 | 2019-08-16 | 陈晓 | A kind of capacitance type sensor of no capacity cell |
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| GB2125219A (en) * | 1982-08-12 | 1984-02-29 | Mfd Capacitors Limited | Moisture removal within capacitors |
| TWI441065B (en) * | 2010-11-03 | 2014-06-11 | Elan Microelectronics Corp | A Capacitive Touch Element for Identifying Conductor and Non - Conductor and Its Method of Discrimination |
| CN110132319A (en) * | 2018-05-11 | 2019-08-16 | 陈晓 | A kind of capacitance type sensor of no capacity cell |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110132319A (en) * | 2018-05-11 | 2019-08-16 | 陈晓 | A kind of capacitance type sensor of no capacity cell |
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