KR102318450B1 - Sensing device and wiper driving device - Google Patents

Abstract

A sensing device according to an embodiment of the present invention includes a substrate; an electrode disposed on the substrate; a reaction layer disposed on the substrate to bury the electrode and including a carbon microcoil; a protective layer disposed on the substrate and molding the reaction layer; and a sensing element disposed on the substrate and connected to the electrode, wherein the sensing element receives a change value of the capacitance value of the carbon microcoil from the electrode, and receives a sensing signal based on the received change value print out

Description

SENSING DEVICE AND WIPER DRIVING DEVICE

The present invention relates to a sensing device, and more particularly, to a sensing device capable of detecting rainfall by using a carbon micro coil (CMC) and a wiper driving device including the same.

In recent years, as automobiles are popularized, automobiles are rapidly spreading across various classes and age groups, and the technological trend of the automobile industry is breaking away from the conventional mechanical point of view such as engines, and the electronicization of each system for the convenience of drivers. And the situation is gradually changing with intelligence.

Recently, as part of the electronicization and intelligentization of automobiles, a technology related to a vehicle rain sensor to automatically control the operation of the vehicle wiper according to the rainfall has been developed, It detects and automatically controls the operation of the wiper.

A conventional vehicle rain sensor installs a light emitting unit and a light receiving unit inside the windshield of the vehicle, and optical conduction to determine the amount of rainfall by using the change in the light intensity of the light receiving unit generated due to a change in the refractive index of light due to rain drops method was mainly used.

However, the conventional optical conduction type rain sensor has a problem that it causes an increase in production cost because its structure and installation are complicated and the parts cost is high, and the measurement accuracy is poor because the measurement area is small and it is greatly affected by contaminants had a problem.

Therefore, in order to solve this problem, a capacitive rain sensor that detects rainfall by using a change in capacitance of a capacitor installed inside the windshield of a car has recently been developed. is disclosed in detail in [Document 1] below.

However, even in the case of the rain sensor disclosed in [Document 1], when the vehicle is exposed to a high frequency (RF) environment such as a wireless communication area, noise generated by the external high frequency (hereinafter referred to as 'high frequency noise') As a result, there is a problem in that the sensing precision is lowered.

In addition, recently, as in [Document 2], rainfall amount, high frequency noise and wiper noise are all detected using a plurality of capacitors, and the high frequency noise and wiper noise are removed from the detected rainfall amount when calculating the actual rainfall. A vehicle rain sensor that can detect rainfall significantly more stably and precisely than a capacitive vehicle rain sensor according to technology is being developed.

However, the capacitive sensor as described above has a low sensitivity, so its application is extremely limited, and there is a problem in that it is vulnerable to high temperature or external environmental pollution.

[Document 1] Republic of Korea Patent No. 10-781744 (2007.12.04. Registration Announcement)

[Document 2] Republic of Korea Patent No. 10-0943401 (Registration Announcement on Feb. 12, 2010)

An embodiment according to the present invention provides a sticker-type sensing device that does not require a separate external case or mounting member.

In addition, an embodiment according to the present invention provides a sensing device having a new structure and design.

In addition, an embodiment according to the present invention provides a sensing device including a carbon fine coil capable of amplifying rainwater detection sensitivity.

In addition, an embodiment according to the present invention provides a sensing device having an electrode structure capable of amplifying rainwater detection sensitivity.

In addition, an embodiment of the present invention provides a sensing device capable of minimizing signal interference by physically separating the reactive layer filling the positive electrode and the reactive layer filling the negative electrode.

The technical problems to be achieved in the proposed embodiment are not limited to the technical problems mentioned above, and other technical problems not mentioned are clear to those of ordinary skill in the art to which the proposed embodiment belongs from the description below. will be able to be understood

A sensing device according to an embodiment of the present invention includes a substrate; an electrode disposed on the substrate; a reaction layer disposed on the substrate to bury the electrode and including a carbon microcoil; a protective layer disposed on the substrate and molding the reaction layer; and a sensing element disposed on the substrate and connected to the electrode, wherein the sensing element receives a change value of the capacitance value of the carbon microcoil from the electrode, and receives a sensing signal based on the received change value print out

In addition, the substrate includes a first upper surface area on which the electrode, the reactive layer, and the protective layer are disposed, a second upper surface area on which the sensing element is disposed, and a third upper surface area between the first and second upper surface areas. includes

In addition, it further includes a shielding layer disposed on the lower surface of the substrate.

In addition, the protective layer further molds the substrate, the sensing element, and the shielding layer.

In addition, the protective layer includes an adhesive film having an adhesive force.

In addition, the electrode includes a first electrode part having a positive polarity and a second electrode part having a negative polarity, and the first electrode part includes a first feeding electrode and a first feeding electrode spaced apart from the first feeding electrode by a predetermined distance. A first floating electrode is included, and the second electrode unit includes a second feeding electrode and a second floating electrode spaced apart from the second feeding electrode by a predetermined interval.

In addition, further comprising a feeding terminal and a ground terminal disposed on the substrate, the first feeding electrode and the second feeding electrode are connected to the feeding terminal, the first floating electrode and the second floating electrode, connected to the ground terminal.

In addition, each of the first feeding electrode, the second feeding electrode, the first floating electrode, and the second floating electrode is disposed on the substrate by turning it a plurality of times.

In addition, the reaction layer includes a first reaction layer disposed on the substrate and burying the first electrode portion, and a second reaction layer disposed on the substrate and filling the second electrode portion, wherein the first The reaction layer is physically separated from the second reaction layer.

In addition, the first barrier rib portion disposed on the substrate and surrounding the periphery of the first reaction layer; and a second barrier rib portion disposed on the substrate and surrounding the second reaction layer.

In addition, the sensing element is connected to the electrode, and communicates with a sensing unit for outputting a sensing signal according to a change in a capacitance value in the reaction layer transmitted from the electrode, and an electronic control unit of the vehicle to receive the sensing signal. and a control unit for transmitting to the electronic control unit.

In addition, the third upper surface region of the substrate is disposed to have a different inclination from the first and second upper surface regions in the passivation layer.

In addition, the third upper surface region of the substrate is bent with a predetermined curvature in the passivation layer.

In addition, the first upper surface area of the substrate is disposed parallel to the second upper surface area of the substrate in the protective layer at a position spaced apart from each other by a predetermined distance.

On the other hand, the wiper driving apparatus according to the embodiment includes a carbon micro-coil, the sensor for outputting a detection signal according to a change in the capacitance value formed by the carbon micro-coil; and a vehicle controller configured to receive a detection signal output from the sensor and determine a wiper driving condition according to the received detection signal, wherein the sensor includes a substrate, an electrode disposed on the substrate, and a substrate disposed on the substrate to bury the electrode, a reaction layer including a carbon microcoil, is disposed on the substrate and connected to the electrode, and receives a change value of the capacitance value of the carbon microcoil from the electrode, and the received change value a sensing element outputting a sensing signal based on and a first top surface area on which the reaction layer is disposed, a second top surface area on which the sensing element is disposed, and a third top surface area between the first and second top surface areas, wherein the third top surface area of the substrate includes: , is bent with a certain curvature in the passivation layer.

In addition, the first upper surface area of the substrate is disposed parallel to the second upper surface area of the substrate in the protective layer at a position spaced apart from each other by a predetermined distance.

In addition, the sensing unit includes a first frequency generator for outputting a first frequency having an oscillation frequency corresponding to a change in the capacitance value of the reaction layer, and a second frequency for outputting a second frequency corresponding to a preset reference oscillation frequency a generator, a difference frequency generator for outputting a difference value between the first frequency and the second frequency, and a filter for filtering the difference value output through the difference frequency generator within a predetermined filtering region.

According to an embodiment of the present invention, by configuring the external protective layer of the sensing device with an adhesive film, it can be easily mounted on a structure without designing a special mechanism.

In addition, according to the embodiment of the present invention, since the overall manufacturing of the sensing device can be performed through the laminating process, it is possible to unify the manufacturing process and reduce the manufacturing cost through process simplification.

In addition, according to an embodiment of the present invention, by minimizing the distance between the reaction layer of the sensing device and the windshield of the vehicle, the sensing sensitivity can be improved accordingly.

In addition, according to the embodiment of the present invention, by attaching the shielding sheet to the lower portion of the insulating film, external noise or noise of an internal chip can be reduced, and thus operation reliability can be improved.

According to the embodiment of the present invention, by additionally disposing a floating electrode in addition to the feeding electrode in the reaction layer, it is possible to maximize the capacitance value additionally generated when rainwater is sensed, thereby improving the rainwater detection sensitivity.

In addition, according to the embodiment of the present invention, the amount of change in the value of capacitance is maximized by minimizing the gap between the feeding electrode and the floating electrode or extending the feeding electrode and the floating electrode to have a rectangular shape or a rectangular spiral shape. and can improve the rainwater detection sensitivity accordingly.

In addition, according to the embodiment of the present invention, by physically separating the reactive layer filling the negative electrode and the positive electrode, signal interference occurring between the negative electrode and the positive electrode can be minimized, and thus the signal-to-noise ratio can improve

1 is a flowchart illustrating a method of manufacturing a glass composition according to an embodiment of the present invention in order of process.
2 is a view showing a carbon fine coil powder 1 according to an embodiment of the present invention.
3 is a view showing a glass composition 3 according to an embodiment of the present invention.
4 is a view showing an operating principle of a sensing device using the glass composition 3 according to an embodiment of the present invention.
5 is a view for explaining a capacitor function of the carbon fine coil according to an embodiment of the present invention.
6 is a view showing the evaluation of the reactivity of the glass composition (3) according to an embodiment of the present invention.
7 is a view showing the evaluation of reactivity according to the content of the carbon fine coil powder (1) and the thickness of the glass composition (3) according to an embodiment of the present invention.
8 is a side view illustrating a state in which a sensing device is mounted on a windshield of a vehicle according to an embodiment of the present invention.
9 is a view showing a sensing device according to a first embodiment of the present invention, and FIG. 10 is an enlarged view of part A of FIG. 9 .
11 is a view showing a sensing device according to a second embodiment of the present invention, FIG. 12 is a side view of part B of FIG. 11 , and FIG. 13 is a plan view of part B of FIG. 11 .
14 is a view showing a sensing device according to a third embodiment of the present invention.
15 is a view showing a sensing device according to a fourth embodiment of the present invention.
16 shows the characteristics of the carbon fine coil according to an embodiment of the present invention.
17 is a view for explaining the sensing sensitivity of a two-line electrode structure according to the prior art, and FIG. 18 is a view for explaining the sensing sensitivity of a four-line electrode structure according to an embodiment of the present invention.
19 is a view showing the configuration of a wiper driving system according to an embodiment of the present invention.
FIG. 20 is a diagram showing the configuration of the sensing unit 219 shown in FIG. 19 .
21 to 23 are diagrams illustrating changes in a difference frequency value according to the first embodiment of the present invention.
24 is a diagram illustrating a change in a difference frequency value according to a second embodiment of the present invention.
25 to 28 are graphs showing change characteristics of carbon microcoils according to an embodiment of the present invention.
29 and 30 show a case of a sensing device according to an embodiment of the present invention.

Hereinafter, the embodiments disclosed in the present specification will be described in detail with reference to the accompanying drawings, but the same or similar components are assigned the same reference numerals regardless of reference numerals, and overlapping descriptions thereof will be omitted. The suffixes "module" and "part" for the components used in the following description are given or mixed in consideration of only the ease of writing the specification, and do not have a meaning or role distinct from each other by themselves. In addition, in describing the embodiments disclosed in the present specification, if it is determined that detailed descriptions of related known technologies may obscure the gist of the embodiments disclosed in the present specification, the detailed description thereof will be omitted. In addition, the accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes included in the spirit and scope of the present invention , should be understood to include equivalents or substitutes.

Terms including an ordinal number, such as first, second, etc., may be used to describe various elements, but the elements are not limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

When a component is referred to as being “connected” or “connected” to another component, it is understood that the other component may be directly connected or connected to the other component, but other components may exist in between. it should be On the other hand, when it is said that a certain element is "directly connected" or "directly connected" to another element, it should be understood that no other element is present in the middle.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present application, terms such as "comprises" or "have" are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, but one or more other features It should be understood that this does not preclude the existence or addition of numbers, steps, operations, components, parts, or combinations thereof.

1 is a flowchart illustrating a method of manufacturing a glass composition according to an embodiment of the present invention in order of process.

Here, the glass composition 3 constitutes the reaction layer 216 of the sensing device 200 to be described later. That is, the glass composition 3 is a reactive layer 216 formed by embedding the plurality of electrodes 211 included in the sensing device 200 . In addition, the reaction layer 216 has a unique capacitance value of the carbon microcoil. In addition, the distance between the carbon micro-coils is changed by a force applied by a sensing object in contact with the windshield or a change in permittivity. In addition, the capacitance value of the carbon microcoil changes according to the change in the distance, and thus the characteristic of the capacitance value is changed. Accordingly, in the present invention, the sensing object is sensed based on the amount of change in the capacitance value that is changed by the reactive layer 216 .

Hereinafter, the glass composition 3 constituting the reaction layer 216 will be described in detail.

Referring to FIG. 1 , in order to manufacture a glass composition 3 , a mixing process of raw materials constituting the glass composition 3 is first performed (Step 1).

The mixing process of the raw materials may largely include a raw material weighing process and a mixing process.

First, for mixing the raw materials, the raw materials constituting the glass composition 3 are measured according to an appropriate mixing ratio.

At this time, the raw material constituting the glass composition 3 includes the glass frit 2 and the carbon fine coil powder 1 . The glass frit 2 is combined with the carbon fine coil powder 1 during the firing process of the glass composition 3, and within a range below the reaction temperature of the carbon fine coil powder 1, the carbon from the external environment The carbon fine coils grown by the fine coil powder (1) are protected.

The glass frit 2 may include various metal oxides depending on the application. Preferably, the glass frit 2 may include silicon oxide, which is a main component of glass. Alternatively, the glass frit 2 may be made of a mixture in which silicon oxide is mixed with at least one of sodium carbonate, alumina, and borosilicate.

In addition, the glass composition 3 may include a metal oxide selected from the group consisting of lead oxide, tellurium oxide, bismuth oxide, zinc oxide, tungsten oxide, silicon oxide, and mixtures thereof.

As an example, the glass frit 2 is made of lead oxide-silicon oxide-tellurium oxide-zinc oxide (PbO-SiO2-TeO2-ZnO), silicon oxide-tellurium oxide-bismuth oxide-zinc oxide-tungsten oxide-based. (SiO2-TeO2-Bi2O3-ZnO-WO3), lead oxide-silicon oxide-tellurium oxide-bismuth oxide-zinc oxide-tungsten oxide (PbO-SiO2-TeO2-Bi2O3-ZnO-WO3), lead oxide-tel oxide It may be a rurium-bismuth oxide system (PbO-TeO2-Bi2O3) or a silicon oxide-tellurium oxide-bismuth oxide-zinc oxide-tungsten oxide system (SiO2-TeO2-Bi2O3-ZnO-WO3).

The glass frit 2 can be prepared from the metal oxide described above using conventional methods. For example, it can be prepared by mixing the metal oxides described above in a specific composition. In this case, the mixing may be performed using a ball mill or a planetary mill. At this time, the mixed composition may be melted at a temperature of 900°C-1300°C, and quenched at 25°C. Then, the resultant obtained by the quenching may be pulverized by a disk mill, a planetary mill, or the like to prepare the glass composition 3 according to an embodiment of the present invention.

At this time, in the mixing ratio of the glass composition 3, the glass frit 2 may be included in 90 to 99 wt%.

Next, the carbon fine coil powder 1 constituting the glass composition 3 is prepared. The carbon fine coil powder 1 includes carbon fine coils.

2 is a view showing a carbon fine coil powder 1 according to an embodiment of the present invention.

Referring to FIG. 2 , the carbon fine coil powder 1 includes carbon fine coils that are not straight, but curled like pig tails, and is an amorphous carbon fiber having a unique structure that a fiber material cannot have. In addition, the carbon micro-coil has a super-elasticity that is stretched to a length of 10 times or more of the original coil length.

The morphology of the carbon fine coil has a 3D-helical/spiral structure, and the crystal structure is amorphous.

In other words, the carbon fine coil as described above is formed by growing carbon fibers in a coil shape, and thus has a cross-sectional structure in which carbon fibers are grown in a coil shape.

Here, the carbon microcoils have properties different from those of carbon nanotubes. That is, the carbon nanotube has a structure in which hexagonal carbons having a nanotube shape are connected.

On the other hand, the carbon microcoil in the present invention has a form in which carbon is grown into a micro-unit coil using a catalyst, not a structure form of carbons.

That is, the carbon nanotubes as described above obtain a measured value by using the change in impedance from a conductor to an insulator by using the characteristic of becoming a conductor and an insulator according to the form of the combination of the elements themselves.

On the other hand, the carbon microcoil according to an embodiment of the present invention is in the form of a coil made of micro-unit carbon, and the characteristics of L that change as the coil is stretched and contracted due to a change in force or dielectric constant and between each carbon microcoil Due to the characteristic of C due to the distance, the impedance changes according to the interaction between the carbon microcoils.

That is, the carbon microcoil itself has the properties of a conductor, but the curing agent or the epoxy resin has the properties of a non-conductor. Due to the above characteristics, the carbon microcoil has a unique capacitance value internally. In addition, when the distance between the carbon micro-coils is changed due to a force or a change in permittivity by the sensing object, the characteristic of the capacitance value of the carbon micro-coils is changed.

In other words, the carbon microcoil has L-C-R characteristics, and thus has frequency absorption characteristics, heat generation characteristics when certain conditions are satisfied, proximity sensing characteristics, and temperature characteristics.

On the other hand, the carbon fine coil powder (1) may be included in 1 to 10% by weight.

In addition, the raw material constituting the glass composition 3 may further include a binder. The binder may be included in the raw material constituting the glass composition 3 in an amount of 1 wt % or less. The binder may be included in the raw material to increase the mixing uniformity between the glass frit 2 and the carbon fine coil powder 1 . In addition, the binder may be selectively removed or the content may be adjusted according to the mixing state between the glass frit 2 and the carbon fine coil powder 1 .

As described above, the raw material metering according to the mixing ratio of the carbon fine coil powder 1 and the glass frit 2 can be carried out through an electronic scale, EPMA (Electron Probe Micro-Analysis), SEM (Scanning Electron Microscope), and an electron microscope. .

Next, when the carbon fine coil powder 1 and the glass frit 2 are measured as described above, a mixing process of mixing the measured glass frit 2 and the carbon fine coil powder 1 may be performed. .

The mixing process may be carried out through a V-type mixer (V-Mixer), a ball-mill (Ball-Mill), and an ultra-vibration stirrer. And, when the mixing process is finished, an evaluation process for the mixing process may be performed. In the evaluation process, the mixing state may be evaluated through an Electron Probe Micro-Analysis (EPMA), a Scanning Electron Microscope (SEM), an electron microscope, and a particle size analyzer.

When the raw material mixing process is completed, a process of plate-forming the blended raw material is performed (step 2).

The plate forming process may include pressing the blended raw material. The pressing process may be performed by a press or a hot press device.

And, the process conditions of the pressing process include a pressure condition between 3 tons to 5 tons, a time condition between 5 minutes and 10 minutes, and a temperature condition of ordinary temperature. When the pressing process is completed, evaluation of the pressing process is performed. The evaluation of the pressing process may be performed through the sintering density that appears as the raw material is press-molded into a predetermined shape by the plate forming process.

When the pressing process is performed, a processing process of processing the pressed raw material is performed (step 3).

The processing process may include a sintering process of sintering the raw material on which the plate forming process has been performed.

The sintering process may be carried out in a kiln, and may be performed under sintering conditions including a temperature increase condition of 10 ° C./min, a sintering temperature condition between 450 ° C. and 700 ° C., a holding time condition of 1 hour, and an air atmosphere condition. have.

When the sintering process is performed, an evaluation process may be performed in the sintering process, and the evaluation process may be performed with the sintered density of the sintered product in the composition in which the sintering process has been performed.

3 is a view showing a glass composition 3 according to an embodiment of the present invention.

Referring to FIG. 3 , as shown in (A), in a state in which the glass composition 3 is initially blended and mixed, the raw material constituting the glass frit 2 and the carbon fine coil powder 1 are The constituent raw materials have only a mixed state.

And, under the sintering conditions as described above, when the raw materials are sintered at a temperature close to a predetermined melting point, bonding is made at the bonding surface between the glass frit 2 and the carbon fine coil powder 1, or some are deposited to prepare a composition connected to each other.

As described above, when the sintering process proceeds, a reliability evaluation process for evaluating the prepared glass composition 3 may be performed (step 4).

In this case, the glass composition 3 may be polished before the reliability evaluation process, and the polishing process may be selectively skipped.

The reliability evaluation process may be performed through an electrical evaluation process.

That is, for the electrical evaluation of the glass composition 3 , a process of measuring the output value of each manufactured glass composition 3 may be performed. At this time, the prepared glass composition 3 may contain the carbon fine coil powder 1 in different amounts. For example, a typical capacitive sensor (0% by weight) without the carbon fine coil powder (1), a glass composition (3) containing the carbon fine coil powder (1) at 1% by weight, 5% by weight As a result, electrical evaluation of the glass composition 3 including the carbon fine coil powder 1 and the glass composition 3 containing the carbon fine coil powder 1 at 10 wt% may be performed, respectively.

The electrical evaluation may be performed with an output value of a digital converter that converts the capacitance value of the glass composition 3 into a digital value and outputs, or an LCR meter capable of measuring the L value/C value/R value, respectively. .

And, in the electrical evaluation, a capacitance value when a specific sensing object does not exist in the module region including the glass composition 3 is set as a reference value, and accordingly, when the specific sensing object enters the module region We can proceed with the change value of the capacitance value of .

4 is a view showing an operating principle of a sensing device using the glass composition 3 according to an embodiment of the present invention.

Referring to FIG. 4 , the carbon fine coils grown by the carbon fine coil powder 1 are included in the glass composition 3 .

When the sensing object approaches within a certain radius of the glass composition 3 or the sensing object comes into contact with the surface of the glass composition 3 by the carbon microcoil, a magnetic field is generated around the glass composition 3 will do

In addition, the arrangement state of the carbon microcoils included in the glass composition 3 is changed by the generated magnetic field, and accordingly, a change in the capacitance value of the glass composition 3 occurs.

In this case, an electrode (described later) may be disposed on the surface of the glass composition 3 . The electrode is connected to a sensing unit (see FIG. 15, 219) and a control unit (see FIG. 15, 200), and the sensing unit 219 and the control unit 200 have a capacitance value of the glass composition 3 through the electrode. A change value is obtained, and the state of the sensing object is sensed accordingly. Here, the state of the sensing object may include a distance from the sensing object, a concentration of the sensing object, a temperature of the sensing object, and humidity according to the sensing object. Also, when the sensing object is moisture (eg, rainwater), the state of the sensing object may include the amount of moisture.

In other words, when the sensing object approaches around the glass composition 3, an electrostatic induction phenomenon occurs. And, the carbon microcoil included in the glass composition 3 performs the function of a capacitor in series/parallel inside the electrode.

5 is a view for explaining a capacitor function of the carbon fine coil according to an embodiment of the present invention.

Referring to FIG. 5 , as shown in (A), the carbon fine coil may serve as a series capacitor in which a plurality of capacitors are connected in series with each other.

Also, as shown in (B), the carbon fine coil may serve as a parallel capacitor in which a plurality of capacitors are connected in parallel to each other.

6 is a view showing the evaluation of the reactivity of the glass composition (3) according to an embodiment of the present invention.

In FIG. 6 , the capacitance change value of the capacitive sensor manufactured by the glass composition 3 including the carbon fine coil powder 1 according to the embodiment of the present invention and the capacitance change value of the general capacitive sensor are compared. shows

For the experiment, four samples were prepared, the first sample was composed of a glass composition (3) containing carbon fine coil powder (1) with A content, and the second sample was composed of carbon fine coil powder (1) with content B content. ) is a glass composition (3), and the third and fourth samples are capacitive sensors that do not contain the carbon fine coil powder (1) and have different capacitance characteristics from each other.

The capacitance change values of the first to fourth samples are shown in a table as follows.

sample 1
(CMC Yoo #1) sample 2
(CMC Yoo #2) sample 3
(CMC None #1) sample 4
(CMC None #2) street 1 1323 1374 859 897 street 2 1066 1029 654 672 street 3 708 687 450 464 street 4 238 232 153 157 street 5 32 31 17 17

Referring to FIG. 6 and Table 1, it was confirmed that the reactivity by distance according to the presence/absence of the carbon microcoil was significantly different.

The distances 1 to 5 are displayed by dividing 3 mm to 15 mm in stages, and the reactivity is a value obtained by analog-digital conversion of a capacitance change value.

As described above, in the case of the sensor including the carbon fine coil, the capacitance value change amount was about 1.55 times higher than that of the conventional sensor, and thus it was confirmed that a sensing device with higher sensitivity could be provided.

7 is a view showing the reactivity evaluation according to the content of the carbon fine coil powder (1) and the thickness of the glass composition (3) according to an embodiment of the present invention.

7, the content of the carbon fine coil powder (1) according to the embodiment of the present invention is different from each other, and the result of comparing the capacitance change value shown by changing the thickness of the glass composition (3) prepared accordingly is shown. .

The experimental results are shown in Table 2 below.

3% by weight 5% by weight 7% by weight 0T 29.60 29.60 29.60 0.2T 34.2 35.54 37.20 0.5T 36.13 37.9 39.20 1.0T 32.5 34.53 35.53 1.5T 33.17 33.93 34.43 2.0T 33.93 34.47 34.73

Referring to FIG. 7 and Table 2, it was confirmed that the reactivity showed a large difference depending on the presence/absence of the carbon microcoil and the content thereof. In addition, it was confirmed that there was a difference in the reactivity according to the thickness of the glass composition (3) prepared including the carbon fine coil powder (1).

At this time, if the content of the carbon fine coil powder (1) exceeds 10% by weight, it is not suitable for the manufacturing process according to the increase in viscosity, and accordingly, the content of the carbon fine coil powder (1) is limited to 10% by weight.

As a result of the experiment, the carbon fine coil powder (1) was included in an amount of 7 wt%, and when the thickness of the glass composition (3) was 0.5T, the best change in capacitance was shown.

Hereinafter, a sensing device manufactured using the glass composition 3 prepared as described above will be described. In this case, the sensing device may include a temperature sensor, a humidity sensor, a proximity sensor, and the like. Meanwhile, in the following description, the detection device will be described as an example of a rain sensor mounted on a vehicle.

8 is a side view illustrating a state in which a sensing device is mounted on a windshield of a vehicle according to an embodiment of the present invention.

8 to 11 , the sensing device 200 is mounted on the windshield 100 of the vehicle. The sensing device 200 is installed to face the windshield 10 of the vehicle. The sensing device 200 detects the presence or absence of raindrops falling on the windshield 10 or a change in capacitance according to the amount of the raindrops.

The sensing device 200 forms a sensing region at a predetermined position on the windshield 100 of the vehicle, and thus detects information according to the state of raindrops generated in the sensing region.

9 is a view showing a sensing device according to a first embodiment of the present invention, and FIG. 10 is an enlarged view of part A of FIG. 9 .

9 and 10 , the sensing device 200 includes a substrate 201 , a terminal 211 , a reaction layer 216 , a sensing unit 218 , a control unit 220 , a protective layer 221 , and a shielding layer ( 222).

Here, the reaction layer 216 is composed of the glass composition 3 described above. In other words, the reaction layer 216 may be the glass composition 3 .

The sensing device 200 as described above is disposed so that the reaction layer 216 faces the inner surface of the windshield 100 of the vehicle. In addition, the sensing device 200 provides information for driving the wiper by detecting the presence or absence of raindrops in contact with the outer surface of the windshield 100 and the amount of change in capacitance according to the amount of raindrops. Here, the amount of change in the capacitance value may mean a change in impedance.

The substrate 201 is a base substrate on which the electrode 211 , the reaction layer 216 , the sensing unit 219 , and the control unit 220 are mounted. In this case, the substrate 201 may be flexible.

To this end, the substrate 201 may include plastic. That is, the substrate 201 may include a flexible plastic such as polyimide (PI), polyethylene terephthalate (PET), propylene glycol (PPG), or polycarbonate (PC).

Also, the substrate 201 may be bent while having a partially curved surface. That is, the substrate 201 may be bent while partially having a flat surface and partially having a curved surface. In detail, the end of the substrate 201 may be curved while having a curved surface, or may have a surface including a random curvature and may be curved or bent.

Also, the substrate 201 may be a flexible substrate having a flexible characteristic. Also, the substrate 201 may be a curved or bent substrate. That is, the product including the substrate may be formed to have flexible, curved, or bent characteristics. For this reason, the product including the substrate 201 according to the embodiment may be changed into various designs.

Preferably, the substrate 201 may be a flexible insulating film.

An electrode 211 is disposed on the substrate 201 . The electrode 211 is disposed on the substrate 201 while being buried in the reaction layer 216 . The electrode 211 is formed in plurality. Preferably, the electrode 211 detects the amount of change in the capacitance value that occurs as the sensing object approaches the periphery of the reactive layer 216 .

The electrode 211 includes a first electrode 211a having a positive polarity and a second electrode 211b having a negative polarity.

The reaction layer 216 is disposed on the substrate 201 and fills the electrode 211 disposed on the upper surface of the substrate 201 . The reaction layer 216 has a predetermined thickness and is disposed on the substrate 201 . The reaction layer 216 includes a conductive material, and thus has a property of changing a capacitance value according to a change in force or dielectric constant.

In the first embodiment of the present invention, through a two-line electrode structure including the first electrode 211a and the second electrode 211b, a change in capacitance occurring between the electrodes is sensed, and based on this, rainwater detect the amount of In this case, both the first electrode 211a and the second electrode 211b are power feeding electrodes to which power is supplied.

A sensing unit 219 and a control unit 220 are disposed on the substrate 201 . That is, the sensing unit 219 and the control unit 220 are disposed on the upper surface of the substrate 201 together with the electrode 211 and the reaction layer 216 .

In other words, the sensing unit 219 , the control unit 220 , the electrode 211 , and the reaction layer 216 are all disposed on the upper surface of the substrate 201 . The sensing unit 219 and the control unit 220 are electrically connected to the electrode 211 . Preferably, the sensing unit 219 is electrically connected to the former. In addition, the sensing unit 219 detects the presence and amount of rain according to the sensing signal transmitted through the electrode 211 and transmits the sensing unit 220 to the control unit 220 . The control unit 220 communicates with an Electronic Control Unit (ECU) 300 of the vehicle based on a signal transmitted through the sensing unit 219 . In this case, the control unit 220 and the ECU 300 of the vehicle may exchange signals with each other through a Local Interconnect Network (LIN).

That is, in general, the REAL TERM of the impedance is the resistance, the POSITIVE IMAGINARY TERM is the inductance, and the NEGATIVE IMAGINARY TERM is the capacitance, and is composed of the sum of the resistance, the inductance and the capacitance.

Accordingly, like a general resistor, an inductor, and a capacitor, the sensing device 200 also needs a pair of electrodes 211 to sense a change in the capacitance value generated in the reactive layer 216 .

The electrode 211 serves to connect the reactive layer 216 and the sensing unit 219 while optimizing the sensing characteristics of the reactive layer 216 .

Here, when a specific force is applied to the surface of the windshield 100 or a material having a specific permittivity comes into contact, the capacitance value of the reaction layer 216 increases, and accordingly, the resistance value and the inductance value are It decreases opposite to the capacitance value.

In this case, the sensed impedance value is the sum of the resistance value, the inductance value, and the capacitance, and accordingly, the impedance value decreases linearly according to the degree of force or permittivity applied to the surface.

The sensing unit 219 may include an analog front end (AFE). At this time, the AFE performs a differential amplification function, and there is a difference in the impedance change state according to the occurrence of the rainfall depending on whether the differential amplification is performed as positive amplification or as negative amplification.

Accordingly, the sensing unit 219 senses a change state of the impedance value based on a reference value according to the differential amplification state, and when the degree of the change state is out of a threshold value, the wiper is driven to remove raindrops let it do

Hereinafter, the driving step of the wiper will be described in more detail.

That is, when raindrops fall, the raindrops have a certain force on the windshield 100 or generate a change in permittivity. In addition, impedance change occurs in the reaction layer 216 according to the applied force or change in permittivity.

In this case, the amount of change in the impedance may correspond to the presence or absence of rain and the amount of rainfall. That is, the force or permittivity applied to the reaction layer 216 is increased in proportion to the amount of rainfall, and the impedance change amount is reduced in inverse proportion to the degree of increase in the permittivity or force.

As described above, when the rainfall occurs, an impedance change (specifically, a change in capacitance value) of the reaction layer 216 occurs, and the amplitude of the sensing unit 219 with respect to the internal clock according to the impedance change occurs. change takes place

In addition, a differential signal according to the differential amplification of the AFE of the sensing unit 219 is output according to a change in the amplitude of the internal clock. Thereafter, when the differential signal is output, the output differential signal is converted into a digital signal and transmitted to the ECU 300 of the vehicle through the controller 220 .

The ECU 300 of the vehicle determines whether the rain and the amount of rainfall are based on the amount of impedance change according to the transmitted digital signal, and when the rain occurs and the amount of rainfall exceeds a threshold point, a wiper for removing raindrops is installed. turn it on

Hereinafter, a driving principle of the sensing device 200 will be described in more detail.

As described above, the electrode 211 including the plurality of feeding electrodes and the plurality of floating electrodes is embedded in the reaction layer 216 made of carbon microcoils. In this case, the reaction layer 216 can determine whether or not rain is rained according to the amount of impedance change by itself, and the measurement sensitivity is also changed according to the shape of the electrode 211 . Accordingly, in the first embodiment of the present invention, the electrode 211 including the first electrode part and the second electrode part bent at least once is formed.

In addition, as described above, the impedance consists of a real part and an imaginary part, and the imaginary part consists of a positive imaginary part (inductive) and a negative imaginary part (capacitive), in which case the carbon micro-coil is included. The sensing device 200 performs measurement using the change in two characteristics of the positive imaginary part (inductive) and the negative imaginary part (capacitive).

That is, when it rains, the force applied to the windshield 100 of the vehicle varies according to the amount of rain, and the amount of water (raindrops) present on the windshield 100 also varies.

At this time, as the name suggests, the carbon fine coil is composed of a very fine coil group, and is also a dielectric material having a dielectric constant. At this time, the force is measured through a change in the inductive component, that is, a change in the characteristics of the carbon microcoil, and the amount of water present on the windshield 010 is measured by a capacitive change due to a change in the dielectric constant.

That is, each layer constituting the sensing device 200 serves as a dielectric having a specific dielectric constant. If it rains as described above, a new dielectric called water exists from the electrode's point of view, and capacitive change occurs accordingly. ..

In this case, the real part can be adjusted according to the area of the reaction layer 216 . In addition, the impedance value of the reactive layer 216 is changed by the change of inductive and capacitive values as described above in a raining situation.

Accordingly, in the embodiment, by detecting a change in the impedance value according to the change in the inductive and capacitive values of the sensing device 200 as described above, it is determined whether or not there is rainfall and the amount of rainfall.

A protective layer 221 is disposed on the substrate 201 . Preferably, the substrate 201 is disposed on the reaction layer 216 and protects the reaction layer 216 . The protective layer 221 may be a protective film that protects the reactive layer 216 from external environmental factors. In this case, the protective layer 221 may be a film having an adhesive property. Accordingly, in the sensing device 100 as described above, the protective layer 221 has adhesiveness, and accordingly, the protective layer 221 can be directly attached to the windshield of the vehicle as an adhesive member.

Meanwhile, a shielding layer 222 is disposed on the lower surface of the substrate 201 . The shielding layer 222 blocks signal interference between adjacent circuits or blocks signal interference with external circuits. Preferably, the shielding layer 222 may shield a signal interference phenomenon caused by electromagnetic interference (EMI) noise.

In another embodiment of the present invention, the shielding layer 222 includes the electrode 211 and the half-layer disposed on the upper region of the substrate 201 , and a sensing unit ( ) disposed on the lower region of the substrate 201 . 219) and the control unit 220 to block signal interference, thereby improving the reliability of the sensing operation.

Hereinafter, the operation of the sensing unit 219 will be described in more detail.

The sensing unit 219 is connected to the electrode 211, and generates an oscillation frequency according to a change in impedance of the reaction layer 216 that occurs according to whether or not there is rain and the amount of rain, and generates an oscillation frequency according to the difference between the oscillation frequency and the reference frequency. It determines whether or not there is rain and the amount of rainfall.

In this case, the sensing unit 219 detects whether the difference frequency between the oscillation frequency and the reference frequency belongs to the preset filtering region, and corresponds to the difference frequency only when the difference frequency is in the preset filtering region. output the digital value.

At this time, although it has been said that the above operation is performed by the sensing unit 219, this is only an example, and the sensing unit 219 may output only a digital value according to the sensing signal transmitted from the electrode. , the following specific sensing operation may be performed in the control unit 220 .

That is, any one of a low-pass filter (LPF) and a band-pass filter (BPF) may be included in the sensing unit 219 according to the characteristics of the sensing device 200 .

In addition, the range of the filtering frequency of the low-pass filter and the band-pass filter is different from each other.

Hereinafter, the electrode 211 will be described in more detail.

The electrode 211 includes a first electrode 211a and a second electrode 211b as described above. In addition, the first electrode 211a and the second electrode 211b may be formed on the substrate 201 to have a mutually symmetrical shape.

In addition, each of the first electrode 211a and the second electrode 211b includes a first electrode part formed in a vertical direction on the substrate 201 , and one end of the first electrode part extending to a central region of the substrate. and a second electrode part having a predetermined inclination angle with respect to one end of the first electrode part.

That is, depending on the shape of the electrode 211 , the range of change in the capacitance value generated in the reaction layer 216 may be changed.

Therefore, in the present invention, in order to improve the change range of the capacitance value of the reaction layer 216 , the first electrode 211a and the second electrode 211b are the first and second electrodes, respectively, as described above. It has a shape including a portion and is disposed on the substrate 201 .

Meanwhile, although not shown in the drawing, a circuit pattern (not shown) is disposed on the substrate 201 . The circuit pattern serves as a wiring, and thus electrically connects the electrode 211, the sensing unit 219, and the control unit 220 to each other.

According to an embodiment of the present invention, by configuring the external protective layer of the sensing device with an adhesive film, it can be easily mounted on a structure without designing a special mechanism.

In addition, according to the embodiment of the present invention, since the overall manufacturing of the sensing device can be performed through the laminating process, it is possible to unify the manufacturing process and reduce the manufacturing cost through process simplification.

In addition, according to an embodiment of the present invention, by minimizing the distance between the reaction layer of the sensing device and the windshield of the vehicle, the sensing sensitivity can be improved accordingly.

In addition, according to the embodiment of the present invention, by attaching the shielding sheet to the lower portion of the insulating film, external noise or noise of an internal chip can be reduced, and thus operation reliability can be improved.

11 is a view showing a sensing device according to a second embodiment of the present invention, FIG. 12 is a side view of part B of FIG. 11 , and FIG. 13 is a plan view of part B of FIG. 11 .

11 to 13 , the sensing device 200 includes a substrate 201 , a terminal 206 , an electrode 211 , barrier rib portions 212 and 213 , a reaction layer 216 , a conductive portion 217 , and a circuit pattern. 218 , a sensing unit 219 , a control unit 220 , and a protective layer 221 .

In the second embodiment of the present invention, the structures of the electrode 211 and the reaction layer 216 are different from the first embodiment shown in FIG. is formed

The electrode 211 and the terminal 206 in the second embodiment are disposed on the substrate 201 . The electrode 211 is disposed on the upper surface of the substrate 201 while being buried in the reaction layer 216 .

The electrode 211 is formed in plurality. In addition, the electrode 211 senses the amount of change in the capacitance value that occurs as the sensing object approaches the periphery of the reactive layer 216 .

The electrode 211 includes a first electrode 207 having a positive polarity and a second electrode 208 having a negative polarity. The first electrodes 207 and 209 and the second electrodes 208 and 210 each include a main electrode and a sub-electrode.

In other words, the first electrodes 207 and 209 include a first feeding electrode 207 fed with power and a first floating electrode 209 floating around the first feeding electrode 207 . In addition, the second electrodes 208 and 210 include a second feeding electrode 208 fed with power, and a second floating electrode 210 floating around the second feeding electrode 208 .

The first feeding electrode 207 and the second feeding electrode 208 are connected to the feeding terminals 202 and 203, and are thus electrically connected to the sensing unit 219 and the control unit 220. .

The first floating electrode 209 and the second floating electrode 210 are closely arranged with the first feeding electrode 207 and the second feeding electrode 208, respectively, and accordingly, the inside of the reaction layer 216 increase the rate of change of the capacitance value at

In the general linear two-line electrode structure, the amount of rainwater was sensed with only a capacitance change value occurring between the first feeding electrode 207 and the second feeding electrode 208 . However, in such an electrode structure, the difference between the capacitance value when it is not raining and the capacitance value when it is raining is relatively low, and thus it is difficult to secure detailed sensing sensitivity. Here, the two-line electrode structure refers to a case in which the electrode 211 includes only the first electrode part except for the second electrode part in FIG. 10 .

That is, the two-line electrode structure including only the first feeding electrode 207 and the second feeding electrode 208 in the form of a straight line as described above is a typical antenna structure, and the total wavelength of the two-line electrode has a specific frequency. EMC (Electro Magenetic Compatibility) issue occurs when it is synchronized with the 1/4 wavelength of

In addition, the mechanism of a general sensing device measures the amount of change in the ratio of the amount of change in capacitance to the basic capacitance value. In this case, in order to increase the detection sensitivity, the basic capacitance value must be lowered or the capacitance change amount must be increased. However, in the two-line electrode structure, there is a limit in lowering the basic capacitance value or increasing the capacitance change amount.

Accordingly, in the second embodiment of the present invention, the first floating electrode 209 closely disposed with the first feeding electrode 207 is disposed around the first feeding electrode 207 as described above. In addition, a second floating electrode 210 closely disposed with the second feeding electrode 208 is disposed around the second feeding electrode 208 .

In this case, the first floating electrode 209 and the second floating electrode 210 are disposed at positions spaced apart from the first feeding electrode 207 and the second feeding electrode 208 by a predetermined distance, respectively.

In addition, the first floating electrode 209 and the second floating electrode 210 may be connected to ground terminals 204 and 205 to be grounded, respectively.

At this time, in order to increase the detection sensitivity, the length of the first floating electrode 209 and the first feeding electrode 207 is minimized while the distance between the first floating electrode 209 and the first feeding electrode 207 is minimized. should be maximized.

Therefore, it is preferable that the first floating electrode 209 and the first feeding electrode 207 are closely spaced apart from each other and disposed on the substrate 201 . In addition, the first floating electrode 209 and the first feeding electrode 207 may be disposed by turning at least once in a rectangular shape on the substrate 201 so as to have a maximum length within a limited space. have. For example, as shown in FIG. 9 , when the sensing device 200 is viewed from the top, the first floating electrode 209 and the first feeding electrode 207 have a rectangular shape or a rectangular spiral shape, respectively. can be placed.

More specifically, the first feeding electrode 207 may extend from one end connected to the feeding terminal 202 to the other end disposed in the reaction layer 216 by turning it a plurality of times in a rectangular shape or a rectangular spiral shape. That is, the first feeding electrode 207 can be turned a plurality of times by extending in a straight line from one end and changing a path in a right angle direction to form a square shape once, and turning it a second time from the inside. At this time, although it is illustrated that the first feeding electrode 207 is disposed by turning 16 times in the drawing, the present invention is not limited thereto.

In addition, the first floating electrode 209 may be disposed at a position spaced apart from the first feeding electrode 207 by a predetermined interval and have the same shape as the first feeding electrode 207 . That is, the first floating electrode 209 may extend from one end connected to the ground terminal 204 to the other end disposed in the reaction layer 216 by turning it a plurality of times in a rectangular shape or a rectangular spiral shape. At this time, although it is illustrated in the drawing that the first floating electrode 209 is disposed by turning 14 times, the present invention is not limited thereto.

Meanwhile, in the reaction layer 216 , the first feeding electrode 207 may be disposed at an outermost portion, and the first floating electrode 209 may be closely disposed within the first feeding electrode 207 .

In addition, as shown in FIG. 9 , the other end of the first feeding electrode 207 and the other end of the first floating electrode 209 are not disposed in the same direction, but in the reaction layer 216 . The electrode portion including the other end of the first feeding electrode 207 and the electrode portion including the other end of the first floating electrode 209 are disposed to face each other.

In addition, the second feeding electrode 208 may extend from one end connected to the feeding terminal 203 to the other end disposed in the reaction layer 216 by turning it a plurality of times in a rectangular shape or a rectangular spiral shape. That is, the second feeding electrode 208 can be turned a plurality of times by extending in a straight line from one end and changing its path in a right angle direction to form a square shape once, and turning it a second time from the inside. At this time, although it is illustrated that the second feeding electrode 208 is disposed by turning 16 times in the drawing, the present invention is not limited thereto.

In addition, the second floating electrode 210 may be disposed at a position spaced apart from the second feeding electrode 208 by a predetermined interval to have the same shape as the second feeding electrode 208 . That is, the second floating electrode 210 may extend from one end connected to the ground terminal 205 to the other end disposed in the reaction layer 216 by turning it a plurality of times in a rectangular shape or a rectangular spiral shape. At this time, although it is illustrated that the first floating electrode 210 is disposed by turning 14 times in the drawing, the present invention is not limited thereto.

Meanwhile, in the reaction layer 216 , the second feeding electrode 208 may be disposed at an outermost portion, and the second floating electrode 210 may be closely disposed within the second feeding electrode 208 .

In addition, as shown in FIG. 9 , the other end of the second feeding electrode 208 and the other end of the second floating electrode 210 do not end the turn at the same position, but in the reaction layer 216 . The turn ends so that the electrode portion including the other end of the second feeding electrode 208 and the electrode portion including the other end of the second floating electrode 210 are disposed to face each other.

Meanwhile, the reaction layer 216 is disposed on the substrate 201 , and thus the electrode 211 is buried therein.

Preferably, the reaction layer 216 has a predetermined thickness and is disposed on the substrate 201 on which the electrode 211 is formed. Here, the electrode 211 includes all of the first feeding electrode 207 , the second feeding electrode 208 , the first floating electrode 209 , and the second floating electrode 210 .

The reaction layer 216 includes a conductive material, and has a property of changing a capacitance value according to a change in a magnetic field, a force, and a dielectric constant generated by an external material.

Preferably, the reaction layer 216 comprises carbon microcoils having a spring shape, which is the glass composition 3 described above.

In the reaction layer 216 , a change in capacitance occurs due to a force applied as a specific material comes into contact with the surface of the windshield 100 to which the sensing device 200 is attached, or a dielectric constant of the specific material.

In addition, the electrode 211 senses a change in the capacitance value of the reactive layer 216 , and transmits a sensing signal according to the change in the capacitance value to the sensing unit 219 .

In this case, the reaction layer 216 may be divided into a plurality of regions. Preferably, the reaction layer 216 includes a first reaction layer 214 in which an electrode having a positive polarity is embedded, and a second reaction layer 215 in which an electrode having a negative polarity is embedded. In addition, on the substrate 201 , the first reaction layer 214 and the second reaction layer 215 are physically separated. In other words, the first reactive layer 214 and the second reactive layer 215 do not contact each other and are disposed on the substrate 201 .

That is, the first electrode unit including the first feeding electrode 207 and the first floating electrode 209 includes the second electrode including the second feeding electrode 208 and the second floating electrode 210 . has a different polarity than negative. Accordingly, when the first electrode part and the second electrode part are disposed in the same reaction layer 216 , there is a problem in that the signal-to-noise ratio (SNR) deteriorates due to signal interference between the electrode parts.

Therefore, in the present invention, the first reaction layer 214 burying the first electrode part including the first feeding electrode 207 and the first floating electrode 209 , the second feeding electrode 208 and the second feeding electrode 208 . The SNR may be improved by physically separating the second reaction layers 215 filling the second electrode part including the two floating electrodes 210 from each other.

Partition walls 212 and 213 surrounding the reaction layer 216 are disposed on the substrate 201 . The barrier rib portions 212 and 213 include a first barrier rib portion 212 surrounding the first reactive layer 214 according to the separation of the reactive layer 216 and a first barrier rib portion 212 surrounding the second reactive layer 215 . A second partition wall portion 213 may be included.

The first and second partition walls 212 and 213 may serve as partition walls (or dams) that physically separate the reaction layer 216 into the first reaction layer 214 and the second reaction layer 215 . have. In addition, the first and second partition walls 212 and 213 may be formed for dispensing while maintaining flatness of upper surfaces of the first and second reactive layers 214 and 215 . The first and second partition walls 212 and 213 may be formed of silicon.

In addition, unlike the structure of the first embodiment of the present invention, the protective layer 221 may be disposed not only on the reaction layer 216 but also in a region between the partition walls 212 and 213 . . That is, the partition walls 212 and 213 are spaced apart from each other by a predetermined distance by exposing at least a part of the upper surface of the substrate 201 . Accordingly, the protective layer 221 may be disposed to cover the exposed upper surface of the substrate 201 .

The sensing unit 219 and the control unit 220 are disposed on the upper surface of the substrate 201 . Since the sensing unit 219 and the control unit 220 have already been described in the first embodiment, they will be omitted.

14 is a view showing a sensing device according to a third embodiment of the present invention.

Referring to FIG. 14 , the sensing device 200 includes a substrate 201 , a terminal 211 , a reaction layer 216 , a sensing unit 218 , a control unit 220 , a protective layer 221 , and a shielding layer 222 . includes

Here, compared to the sensing device illustrated in FIG. 9 , the sensing device according to the third embodiment of the present invention is substantially the same except for the structure of the protective layer 221 . Meanwhile, although it has been said that the structure of the protective layer 221 in the third embodiment of the present invention is applied only to the structure of the first embodiment of the present invention shown in FIG. 9, the structure of the second embodiment of the present invention shown in FIG. It could also be applied to structures.

In the first embodiment of the present invention, it is said that the protective layer 221 is disposed to cover only the reaction layer 216 .

On the other hand, in the third embodiment of the present invention, the protective layer 221 includes not only the reaction layer 216 , but also the upper and side surfaces of the substrate 201 , the lower surface of the shielding layer 222 , and the It may be disposed to cover both the sensing unit 219 and the control unit 220 disposed on the substrate 201 .

In other words, the protective layer 221 covers all sensing devices including the substrate 201 , the electrode 211 , the protective layer 221 , the sensing unit 219 , the controller 220 , and the shielding layer 222 . and is placed

The protective layer 221 may be a sealing member, thereby protecting the components disposed therein from external contamination factors.

In addition, the protective layer 221 may have an adhesive force, and thus may be directly attached to the windshield 100 of the vehicle.

15 is a view showing a sensing device according to a fourth embodiment of the present invention.

Referring to FIG. 15 , the sensing device 200 includes a substrate 201 , a terminal 211 , a reaction layer 216 , a sensing unit 218 , a control unit 220 , a protective layer 221 , and a shielding layer 222 . includes

Here, the sensing device according to the fourth embodiment of the present invention is substantially the same as the sensing device shown in FIG. 9 except that only the structure of the protective layer 221 is different from that of the sensing device shown in FIG. 9 . Meanwhile, although it has been said that the structure of the protective layer 221 in the fourth embodiment of the present invention is applied only to the structure of the first embodiment of the present invention shown in FIG. 9, the structure of the second embodiment of the present invention shown in FIG. It could also be applied to structures.

In the first embodiment of the present invention, it is said that the protective layer 221 is disposed to cover only the reaction layer 216 . On the other hand, in the fourth embodiment of the present invention, the protective layer 221 includes not only the reaction layer 216 , but also the upper and side surfaces of the substrate 201 , the lower surface of the shielding layer 222 , and the It may be disposed to cover both the sensing unit 219 and the control unit 220 disposed on the substrate 201 . In other words, the protective layer 221 covers all sensing devices including the substrate 201 , the electrode 211 , the protective layer 221 , the sensing unit 219 , the controller 220 , and the shielding layer 222 . and is placed

The protective layer 221 may be a sealing member, thereby protecting the components disposed therein from external contamination factors. In addition, the protective layer 221 may have an adhesive force, and thus may be directly attached to the windshield 100 of the vehicle.

In this case, the substrate 201 in the third embodiment of the present invention was a flexible substrate, but the substrate 201 was disposed in the protective layer 221 to have a flat plate shape.

On the other hand, the substrate 201 according to the fourth embodiment of the present invention includes a bent region in which at least a part of the protective layer 221 is folded.

Preferably, the substrate 201 includes a first region 201a in which the electrode 211 and the reaction layer 216 are disposed, and a second region in which the sensing unit 219 and the controller 220 are disposed. 201c and a third region 201b between the first and second regions 201a and 201c.

In this case, the first region 201a may be a first edge region of the substrate 201 . Also, the second region 201c may be a second edge region of the substrate 201 opposite to the first edge. The third region 201b may be a central region existing between the first and second edge regions.

The passivation layer 221 fixes the substrate 201 so that the substrate 201 maintains a bent state around the third region 201c. In other words, in the substrate 201 , a first region 201a and a second region 201c face each other with respect to the third region 201b. At this time, since the substrate 201 is flexible, the bent state of the third region 201b cannot be continuously maintained. Accordingly, the passivation layer 221 is disposed to surround the entire area of the substrate 201 in a state in which the third region 201b is bent, so that the third region 201b is in a bent state. to keep it going.

The shielding layer 222 disposed under the first region 201a and the shielding layer 222 disposed under the second region 201c are spaced apart from each other and directly facing each other. In addition, the protective layer 221 is disposed in the spaced region of the shielding layer 222 .

Accordingly, between the first region 201a and the second region 201c of the substrate 201 , the shielding layer 222 under the first region 201a, the protective layer 221 and the second The shielding layer 222 under the region 201c is sequentially disposed.

Accordingly, the first region 201a of the substrate 201 including the electrode 211 and the protective layer 221, and the substrate 201 including the sensing unit 219 and the control unit 220 Noise may be completely blocked between the second regions 201c, and thus, operation reliability may be improved.

In addition, in the present invention, after forming the substrate 201 to be bent as described above, it is directly attached to the windshield 100 of the vehicle using the protective layer 221 to provide a slim and light sensing device. can

16 shows the characteristics of the carbon fine coil according to an embodiment of the present invention.

As shown in FIG. 16 , the carbon micro-coils normally have a first inductance value, and as a force or dielectric constant is applied to the carbon micro-coils, the inductance value decreases.

The inductance value has a different reduction amount depending on the type of material placed on the carbon microcoil.

That is, the inductance value has a relatively small decrease when rainwater according to rainfall contacts the carbon micro-coil, and when a part of the human body such as a person comes into contact, it has a higher decrease than when the rainwater contacts, and the metal When the material comes into contact, it has a higher reduction amount than when the rainwater or the human body comes into contact.

Hereinafter, the sensing sensitivity of the general two-line electrode structure and the sensing sensitivity of the four-line electrode structure according to an embodiment of the present invention will be described.

17 is a view for explaining the sensing sensitivity of a two-line electrode structure according to the prior art, and FIG. 18 is a view for explaining the sensing sensitivity of a four-line electrode structure according to an embodiment of the present invention.

First, referring to FIG. 17 , the sensing unit 219 generates a first frequency f1 , and accordingly the internal capacitance value Cr and the capacitance value Cs of the reactive layer 216 . The final change amount is output according to the change amount.

At this time, the change ratio when it does not rain on the windshield 100 and the change ratio when it rains are shown below.

Ro = Cs/Cr : ratio of change when it is not raining

Rr = (Cs+ΔCr)/Cr: ratio of change when

Here, Cs is a capacitance value in the reaction layer 216 , Cr is a reference capacitance value in the sensing unit 219 , and ΔCr is a capacitance value that may additionally occur in case of rain.

As described above, when ΔCr is increased to the maximum possible under the same Cr condition, Rr is increased accordingly, and based on this, the sensing unit 219 signals a change ratio according to the increased Rr.

Referring to FIG. 18 , FIG. 18A shows capacitance values that may occur in an upper direction and a lower direction of the sensing device 200 according to an embodiment of the present invention, and FIG. 18B shows the sensing device 200 according to an embodiment of the present invention. (200) shows the capacitance values that can occur in the lateral direction.

Referring to FIG. 18A , between the first feeding electrode 207 and the second feeding electrode 208, a capacitance value generated in an upward direction is C21, and a capacitance value generated in a downward direction is C1. can do. In addition, a capacitance value generated in an upward direction between the first feeding electrode 207 and the first floating electrode 209 may be referred to as C31. Also, a capacitance value generated in an upward direction between the second feeding electrode 208 and the second floating electrode 210 may be referred to as C32. Also, a capacitance value generated in a downward direction between the first floating electrode 209 and the second floating electrode 210 may be referred to as C0.

Also, referring to FIG. 18B , a capacitance value generated in a lateral direction between the first floating electrode 209 and the second floating electrode 210 may be referred to as C22.

Here, since C0 and C1 are commonly applied to the 4-line electrode structure of the present invention and the conventional 2-line electrode structure, they are excluded from the comparison below.

And, in the present invention, as described above, by applying a floating electrode in addition to the feeding electrode, ΔCr, which means a capacitance value that is additionally generated when it rains, is made as large as possible.

Below, the conventional two-line electrode structure in non-rain and rain cases and the four-line electrode structure of the present invention are compared as follows.

First, the conventional two-line electrode structure may be expressed as follows.

(1) Cs1=C21, Ro=C21/Cr

: Change ratio of the conventional two-line electrode structure when it is not raining

Here, Cs1 denotes a capacitance value in the reaction layer 216 having a two-line electrode structure, Cr denotes a reference capacitance value in the sensing unit 219, and Ro denotes a ratio of change in capacitance value when it does not rain. means

(2) Cs1 = C21 + ΔCr21, Rr = (C21/Cr) + (ΔCr21/Cr)

: Change ratio of the conventional two-line electrode structure when it rains

Next, the 4-line electrode structure according to the present invention can be expressed as follows.

(1) Cs2 = C21+(C31/C32/C22), Ro = (C21/Cr)+((C31/32/C22)/Cr)

: Change ratio of the 4-line electrode structure of the present invention when it does not rain

Here, Cs1 denotes a capacitance value in the reaction layer 216 having a four-line electrode structure, Cr denotes a reference capacitance value in the sensing unit 219, and Ro denotes a ratio of change in capacitance value when it does not rain. means

(2) Cs2=C21+ΔCr21+((C31+ΔCr31)/(C32+ΔCr32)/(C22+ΔCr22))

Rr = (C21/Cr)+(ΔCr21/Cr)+((C31+ΔCr31)/(C32+ΔCr32)/(C22+ΔCr22)/Cr)

: Change ratio of the 4-line electrode structure of the present invention when it rains

As described above, in the 4-line electrode structure of the present invention, compared to the conventional 2-line electrode, the floating electrode corresponding to the "(C31+ΔCr31)/(C32+ΔCr32)/(C22+ΔCr22)/Cr" part There is a change in an additional capacitance value by the

19 is a view showing the configuration of a wiper driving system according to an embodiment of the present invention.

Referring to FIG. 19 , the wiper driving system is largely divided into a sensing device 200 and a vehicle. Here, the vehicle may be divided into an ECU 300 that controls the overall operation of the vehicle's electrical components, a manipulation unit 400 that controls the operation of the wiper, and a motor 500 that drives the wiper.

As described above, the sensing device 200 includes a sensing unit including the reaction layer 216 and the electrode 211 , a sensing unit 219 , and a control unit 220 . Here, the control unit 220 is a slave control unit that communicates with the control unit 301 in the ECU 300 of the vehicle.

As described above, the sensing unit generates a change in capacitance in the reaction layer 216 when it rains and when it does not rain on the windshield 100 , and transmits a change signal according to the change to the sensing unit 219 .

The sensing unit 219 generates a first frequency, generates a second frequency that changes according to a change in the capacitance value, and detects whether it rains and the amount of rain according to a difference between the first and second frequencies do. A detailed operation of the sensing unit 219 will be described in detail below.

The control unit 220 communicates with the control unit 301 in the ECU 300 of the vehicle, and accordingly applies an algorithm for optimizing mutual communication. The control unit 220 controls the sensing unit 219 according to a control signal of the control unit 301 in the ECU 300 of the vehicle, and transmits the signal detected by the sensing unit 219 to the ECU 300 of the vehicle. ) to the control unit 301 in the.

In this case, information may be exchanged between the controller 220 and the controller 301 in the ECU 300 of the vehicle according to a Local Interconnect Network (LIN).

The LIN operates according to a master-slave principle. And its signal format and protocol (= digital information format) are standardized. Here, the master-slave principle is a system in which one main computer (master) at the center and a plurality of computers connected online and subordinated to it (slave) divide and process the work according to each data processing content. Also called master-slave system.

On the other hand, the ECU 300 controls the overall operation of the electric components of the vehicle. In particular, the ECU 300 controls the operation of a wiper (not shown).

The manipulation unit 400 is installed in a specific area of the interior of the vehicle, so that the driver manually operates the wiper.

The motor 500 is connected to the wiper, and thus provides a driving force for operating the wiper.

The ECU 300 is connected to the sensing device 200 and the manipulation unit 400 , and accordingly outputs a motor driving signal for controlling the operation of the wiper. To this end, the controller 301 is connected to the sensing device 200 , and accordingly receives a sensing signal output from the sensing device 200 . In this case, the detection signal may have a specific digital value, and the controller 301 may calculate whether it rains and the amount of rain based on the digital value.

Also, the control unit 301 determines whether a wiper operation signal is input from the operation unit 400 . In this case, a communication unit 304 is disposed between the control unit 301 and the operation unit 400 . The communication unit 304 transmits the operation signal input from the operation unit 400 to the control unit 301 according to a LIN (Local Interconnect Network) method.

The control unit 301 outputs a driving signal for driving the wiper using the manipulation signal transmitted through the communication unit 304 and the sensing signal transmitted through the sensing device 200 .

The signal processing unit 302 signals the driving signal output through the control unit 301 and outputs a motor control signal according to the driving signal accordingly.

The motor driving unit 303 drives the motor 500 using a driving signal signal processed through the signal processing unit 302 . At this time, the motor driving unit 303 controls whether the motor 500 is driven and the driving speed based on whether it rains, whether the manipulation signal is input, the amount of rain or a manually set speed. output a signal.

FIG. 20 is a diagram showing the configuration of the sensing unit 219 shown in FIG. 19 .

Referring to FIG. 20 , the sensing unit 219 includes a first frequency generator 2191 , a second frequency generator 2192 , a difference frequency generator 2193 , a filter 2194 , and an analog-to-digital converter 2195 .

A first frequency generator 2191 is connected to the sensing unit and generates a first frequency according to a change in impedance of the sensing unit.

The first frequency generator 2191 may be configured as an LC oscillation circuit.

Preferably, the first frequency generator 2191 is configured to generate an oscillation frequency that is changed by a change in an inductance value of the carbon fine coil using a carbon fine coil and a capacitor constituting the sensing unit.

That is, the first frequency generator 2191 oscillates an oscillation frequency by the sensing unit using a carbon fine coil attached to the windshield.

In other words, the inductance value of the carbon microcoil constituting the sensing unit and the capacitance value of the capacitor determine the oscillation frequency of the first frequency generator 2191 .

The second frequency generator 2192 may be a reference oscillator and generates a second frequency corresponding to the reference oscillation frequency.

At this time, the first frequency generated by the first frequency generator 2191 may have a minute change, and accordingly, in the first embodiment of the present invention, the filter 2194 is configured as a low-pass filter.

Hereinafter, it is assumed that the filter 2194 is configured as a low-pass filter.

At this time, in a state in which no rainfall occurs in the sensing unit, the first frequency generated by the first frequency generator 2191 and the second frequency generated by the second frequency generator 2192 are set to have the same value. can

And, when rainfall occurs in the sensing unit, the difference between the first frequency and the second frequency increases according to the amount of rainfall, and the rainfall amount can be determined based on the increased difference value.

At this time, if the inductance of the carbon fine coil included in the sensing unit is L and the capacitance of the capacitor is C, the first frequency ω ₀ generated by the first frequency generator 2191 is the same as Equation 1.

_{In addition, the first voltage value V 0} corresponding to the first frequency generated by the first frequency generator 2191 is expressed by Equation 2 below.

In addition, the second voltage value Vr corresponding to the second frequency generated by the second frequency generator 2192 is expressed by Equation 3 below.

The difference frequency generator 2193 is connected to the first frequency generator 2191 and the second frequency generator 2192, the first frequency generated by the first frequency generator 2191, and the second frequency generator 2192 ) and output the difference value corresponding to the difference in the second frequency.

In this case, the difference value Vdmod generated by the difference frequency generator 2193 is expressed by Equation 4 below.

Here, the reason that the difference value has the same value as in Equation 4 is the first frequency and the second frequency generated by the first frequency generator 2191 when no rainfall occurs in the sensing unit. This is because the second frequencies generated by the generator 2192 have the same value.

The filter 2194 filters the output value generated by the difference frequency generator 2193 and outputs the filtered output value.

In this case, a filtering region corresponding to a frequency range of a certain size exists in the filter 2194, and the output value of the difference frequency generator 2193 is filtered within the filtering region.

Here, the filtering area may be determined by the type of the filter 2194 and the change characteristics of the carbon microcoil that appears when rainfall occurs in the sensing unit.

The change characteristics of the carbon microcoil will be described in more detail below.

Meanwhile, the type of the filter 2194 may be determined by the structure of the carbon microcoil.

That is, the inductance value of the carbon fine coil changes minutely without changing within a large range depending on whether or not rain and the amount of rainfall, and the first frequency generated by the first frequency generator 2191 according to the minutely changed value When there is no significant difference from the second frequency generated by the second frequency generator 2192, the filter 2194 may be configured as a low-pass filter.

In addition, the first frequency generated by the first frequency generator 2191 according to the change in the inductance value of the carbon microcoil has a large difference from the second frequency generated by the second frequency generator 2192. The filter 2194 may be configured as a band pass filter.

In other words, the type of the filter 2194 may be determined by a structure such as the area of the carbon microcoil constituting the sensing unit.

The analog-to-digital converter 2195 converts the output value output through the filter 2194 into a digital value and outputs it.

21 to 23 are diagrams illustrating changes in a difference frequency value according to the first embodiment of the present invention.

Referring to FIG. 21 , when a specific material does not come into contact with the sensing unit and a change in permittivity does not occur, the first frequency generated by the first frequency generator 2191 and the second frequency generator 2192 The generated second frequency may have the same frequency.

Accordingly, the output value filtered by the filter 2194 according to the output value output from the difference frequency generator 2193 in a state in which the rainfall does not occur is almost a DC voltage level.

And, referring to FIG. 22 , when a specific material comes into contact with the sensing unit and a change in permittivity occurs, and the contact material is rainwater due to rain, the output value filtered by the filter 2194 is within a preset filtering area. frequency shift occurs.

In other words, when a change in the inductance value of the carbon microcoil of the sensing unit occurs as rainfall occurs, a change in the first frequency generated by the first frequency generator 2191 occurs, and accordingly, the first frequency and the second frequency difference.

In this case, the frequency difference between the first frequency and the second frequency increases according to the intensity (rainfall amount) of the generated rainfall.

Accordingly, in an embodiment of the present invention, the amount of rainfall may be determined according to a value of a difference frequency between the first frequency and the second frequency. In other words, in the embodiment of the present invention, it is determined whether it rains or not and the amount of rainfall according to the frequency domain change amount according to the signal output from the filter 2194 .

Here, the difference between the first frequency and the second frequency may be caused by rainwater or moisture according to rainfall, or may also be caused by other foreign substances.

The foreign material may include a human body, paper, stone, and a metal material.

Here, the degree of change in the inductance value due to rainfall and the degree of change in the inductance value due to foreign substances such as the human body, paper, stone, and metal material of the carbon micro coil are different from each other.

In other words, the inductance value of the carbon microcoil is different from the critical point of the change caused by the rainfall and the critical point of the change caused by the foreign material such as the human body, paper, stone, or metal material.

Accordingly, it is possible to distinguish whether the difference between the first frequency and the second frequency is caused by rain or foreign substances according to the threshold of change of the inductance value (characteristics of change of the carbon microcoil).

And, in the embodiment, the filtering area of the filter 2194 is determined according to the change characteristics of the carbon microcoil generated by each material, and the difference between the first frequency and the second frequency within the determined filtering area It is possible to selectively drive the wiper only when .

Referring to FIG. 23 , when the difference between the first frequency and the second frequency is caused by foreign matter other than the rain, the difference frequency may have a frequency outside the filtering region of the filter 2194 .

In this case, since the difference frequency is not included in the filtering region as shown in FIG. 19 , in this case, the wiper is not driven.

24 is a diagram illustrating a change in a difference frequency value according to a second embodiment of the present invention.

Referring to FIG. 24, when the design of the sensing unit has a difference between the first frequency and the second frequency in the case where no rain occurs, and the degree of increase or decrease of the first frequency in the case where the rain occurs is large, The filter 2194 may be configured as a band pass filter.

In this case, the filtering region of the filter 2194 may have a different frequency range from that of the low-pass filter.

In addition, it is possible to determine whether or not rain and the amount of rainfall occur in the filtering region according to the degree of movement of the difference frequency that occurs according to the change of the difference frequency.

In this case, when the filter 2194 is a band-pass filter, the output value of the difference frequency generator 2193 is as shown in Equation 5 below.

25 to 28 are graphs showing change characteristics of carbon microcoils according to an embodiment of the present invention.

Referring to FIG. 25 , the carbon microcoils are separated from each other according to stone, paper, servo motor, mobile phone 1 (power off state), mobile phone 2 (power on state), mobile phone 3 (battery disconnected state), battery, multimeter and water. have different characteristics of change.

In other words, the carbon micro-coils generate different output values according to the materials as described above.

Looking at the change in the output value of the carbon microcoil, different changes occurred depending on the contact area and the contact direction even for the same stone, and as the size of the stone increases, the weight and the contact area increase, thereby increasing the output value.

In addition, even when a non-magnetic material such as paper or a magnetic material such as a servomotor comes into contact, a large change in the output value occurs without the influence of the magnetic field.

26 and 27, the output value of the carbon fine coil according to the present invention has a characteristic that is clearly distinguished from the case where the human body comes into contact with the case where the water comes into contact with the rain.

That is, the output value of the carbon microcoil has a negative value when the human body comes into contact with it, and has a positive value when it comes into contact with water such as rain.

Therefore, in the present invention, the difference between the first frequency generated by the first frequency generator 2191 and the second frequency generated by the second frequency generator 2192 is caused by human contact based on the characteristics of the carbon microcoil as described above. It can be clearly distinguished whether it is caused by rain or rain.

Accordingly, in the present invention, the reaction area of the sensing device 200 , that is, the filtering area of the filter 2194 is determined based on the characteristics of the carbon microcoils that respond to the rainfall.

Therefore, in the present invention, by using the characteristics of the carbon fine coil as described above, the sensing unit may operate only when rain is sensed, and the wiper may not be operated when a change is detected by a foreign substance such as a human body.

That is, in general, the driver operates the operation of the wiper automatically, but there are cases in which children touch the rain sensor placed on the front of the windshield out of curiosity. There was a risk of injury to young children by operating the wiper.

However, in the present invention, even when the difference between the first frequency and the second frequency occurs when the human body of children as described above comes into contact, the wiper is not operated, thereby further securing safety.

As described above, in the present invention, whether or not rain and the amount of rainfall are determined by the change value of the oscillation frequency generated according to the change in the inductance of the carbon microcoil.

On the other hand, in the prior art using the conventional optical method, since the optical signal recognized by the photodiode is different depending on the external illuminance despite the same amount of rainfall, an optical sensor for correcting this must be additionally applied, and around the rain sensor during rain. When a certain level of light is emitted, a roughness sensor to prevent malfunctions must be additionally applied, and supplementary means are essential for verifying malfunctions caused by changes in the external environment.

In addition, in the prior art using the existing impedance method, it is necessary to develop a separate circuit algorithm software so that the rain sensor does not react at a sensing level above a specific critical point, and a specific level of a specific material (stone, person, metal, etc.) Sensing level data baseization is required, and the wiper operation must be manually changed during non-operation, so it is essential to prevent malfunction of the wiper by approaching the rain sensor of a specific foreign material rather than changing the external environment.

However, in the present invention, since the external environment does not affect the characteristics of the rain sensor at all, an additional correction sensor for characteristic correction is unnecessary, thereby reducing costs.

In addition, in the present invention, since rainfall and rainfall can be measured even with a minute change in inductance, it is possible to detect a low level of rainfall and avoid foreign substances on the windshield in a circuit without applying a separate software algorithm for avoiding foreign substances. can do.

28 is a flowchart for explaining step-by-step a sensing method of a sensing device according to an embodiment of the present invention.

Referring to FIG. 28 , first, the first frequency generator 2191 generates a first frequency according to the inductance value of the carbon microcoil constituting the sensing unit (step 10).

Then, the second frequency generator 2192 generates a second frequency corresponding to the preset reference oscillation frequency (step 11).

Then, the difference frequency generator 2193 receives the first frequency generated by the first frequency generator 2191 and the second frequency generated by the second frequency generator 2192, and accordingly the first frequency and the second frequency 2 Outputs the frequency difference (step 12).

Accordingly, the filter 2194 filters the output difference frequency and determines whether the difference frequency exists in a preset filtering area (step 13).

And, when the difference frequency is within a predetermined filtering region, the analog-to-digital converter 2195 generates and outputs an output value corresponding to the difference frequency. Then, the control unit receives the output value, and detects whether there is rain and the amount of rain based on the received output value (step 14).

Next, the controller determines a driving condition of the wiper based on the detected rainfall amount, and controls the wiper to be driven according to the determined driving condition (step 15).

On the other hand, the filter 2194 does not output an output value corresponding to the received difference frequency if the received difference frequency does not exist within a preset filtering region, and thus ignores the received difference frequency (16). step).

That is, when a difference between the first frequency and the second frequency occurs due to a foreign substance, the difference frequency does not exist in the filtering region, and accordingly, the rain sensor does not respond.

29 and 30 show a case of a sensing device according to an embodiment of the present invention.

29 and 30 , the sensing device 200 as described above encloses the substrate 201 and has an accommodating space for accommodating the electrode, the partition wall part, the reaction layer, the sensing part, and the control part therein. 221 is arranged. Since the case 221 constitutes the protective layer 221 , the same reference numerals are given. Preferably, the case 221 may be used instead of the protective layer 221 in FIG. 14 .

The case 221 has an accommodating space therein, a first case 2211 in which the sensing device 200 is accommodated in the accommodating space, and the first case 2211 disposed under the first case 2211 ( and a second case 2212 covering the lower region of 2211 .

The first case 2211 includes an upper surface portion 22111 forming an upper surface appearance. The upper surface portion 22111 has an outer surface in contact with a structure to be mounted, and an inner surface in contact with a sensing device accommodated therein. Preferably, the inner surface of the upper surface portion 22111 is in direct contact with the upper surface of the reactive layers 214 and 215 of the sensing device accommodated therein.

And, the outer surface of the first case 2211 is in direct contact with the windshield 100 provided in the vehicle. Preferably, the outer surface of the first case 2211 may include a material having an adhesive force, so that the outer surface of the first case 2211 and the windshield 100 may be in direct contact.

Alternatively, a separate adhesive member (not shown) may be disposed on the outer surface of the first case 2211 , and accordingly, between the front glass 100 and the upper surface of the first case 2211 , the An adhesive member may be further disposed.

The first case 2211 includes a side portion 22112 that is bent substantially vertically downward from the side end of the upper surface portion 22111 and extends to a predetermined length.

The side portion 22112 is disposed to surround the side portion of the upper surface portion 22111, and opens the lower portion of the upper surface portion 22111. A height of the side part 22112 may correspond to a height of the sensing device.

An insertion groove 22114 recessed in an outward direction of the side part 22112 is formed on an inner surface of the side part 22112 . A plurality of insertion grooves 22114 are formed in the side portion 22112 . In other words, the hook portion 22123 formed in the second case 2212 is inserted into the insertion groove 22114 , and thus corresponds to the position of the hook portion 22123 and the number of the hook portions 22123 . formed to be

On the other hand, the side portion 22112 may be composed of four. That is, the upper surface portion 22111 may have a rectangular shape, and the side portion 22112 may vertically extend downwardly from four ends of the upper surface portion 22111 .

In this case, at least one of the side portions 22112 is formed with a first open portion 22115 in which a lower portion of the side portion 22112 is depressed in an upward direction. The first opening 22115 exposes at least a portion of the sensing device 200 accommodated in the first case 2211 . Preferably, the first opening 22115 exposes the interface of the controller 220 of the sensing device 200 . A communication line (not shown) between the control unit 220 and the control unit 301 of the ECU 300 may be inserted into the first opening 22115 .

The second case 2212 covers the open lower portion of the first case 2211 . To this end, the second case 2212 includes a lower surface portion 22121 and a side portion 22122 bent upward from the lower surface portion 22121 .

In this case, the lower surface portion 22121 does not have a flat shape on the outer surface and the inner surface, and the inner surface may gradually increase from left to right. In other words, the lower surface portion 22121 may have a shape having a predetermined inclination angle and gradually decreasing in height from left to right. Preferably, the lower surface portion 22121 may have a shape inclined to correspond to an inclination angle of the front glass 100 to which the first case 2211 is attached.

The side portion 22122 may be formed to extend upwardly from a side end of the lower surface portion 22121 . In this case, the upper surface of the side part 22122 may be disposed to lie on the same plane in the entire area. Accordingly, the height of the side part 22122 may be different depending on the area. Preferably, the lower surface portion 22121 has different heights depending on the location, and accordingly, the side portion 22122 may also have different heights depending on the location.

In addition, a hook portion 22123 protruding upward of the side portion 22122 is disposed on the side surface portion 22122 and the lower surface portion 22121 . The hook portion 22123 is fitted into the insertion groove 22114 .

In addition, a second opening 22124 corresponding to the first opening 22115 is formed in at least one region of the side surface 22122 . The second opening 2214 is coupled to the first opening 22115 to partially open the inner accommodation spaces of the first and second cases 2211 and 2212 so that the communication line is inserted.

According to an embodiment of the present invention, by configuring the external protective layer of the sensing device with an adhesive film, it can be easily mounted on a structure without designing a special mechanism.

In addition, according to the embodiment of the present invention, since the overall manufacturing of the sensing device can be performed through the laminating process, it is possible to unify the manufacturing process and reduce the manufacturing cost through process simplification.

In addition, according to an embodiment of the present invention, by minimizing the distance between the reaction layer of the sensing device and the windshield of the vehicle, the sensing sensitivity can be improved accordingly.

In addition, according to the embodiment of the present invention, by attaching the shielding sheet to the lower portion of the insulating film, external noise or noise of an internal chip can be reduced, and thus operation reliability can be improved.

According to the embodiment of the present invention, by additionally disposing a floating electrode in addition to the feeding electrode in the reaction layer, it is possible to maximize the capacitance value additionally generated when rainwater is sensed, thereby improving the rainwater detection sensitivity.

In addition, according to the embodiment of the present invention, the amount of change in the value of capacitance is maximized by minimizing the gap between the feeding electrode and the floating electrode or extending the feeding electrode and the floating electrode to have a rectangular shape or a rectangular spiral shape. and can improve the rainwater detection sensitivity accordingly.

In addition, according to the embodiment of the present invention, by physically separating the reactive layer filling the negative electrode and the positive electrode, signal interference occurring between the negative electrode and the positive electrode can be minimized, and thus the signal-to-noise ratio can improve

Features, structures, effects, etc. described in the above embodiments are included in at least one embodiment, and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. illustrated in each embodiment can be combined or modified for other embodiments by those of ordinary skill in the art to which the embodiments belong. Accordingly, the contents related to such combinations and modifications should be interpreted as being included in the scope of the embodiments.

In the above, the embodiment has been mainly described, but this is only an example and not limiting the embodiment, and those of ordinary skill in the art to which the embodiment pertains are provided with several examples not illustrated above in the range that does not depart from the essential characteristics of the embodiment. It can be seen that variations and applications of branches are possible. For example, each component specifically shown in the embodiment can be implemented by modification. And differences related to such modifications and applications should be construed as being included in the scope of the embodiments set forth in the appended claims.

Claims (10)

Board;
an electrode disposed on the substrate;
a reaction layer disposed on the substrate to bury the electrode and including a carbon microcoil;
a protective layer disposed on the substrate and molding the reaction layer;
a shielding layer disposed under the substrate; and,
It is disposed on the substrate and comprises a sensing element connected to the electrode,
The sensing element is
receiving a change value of the capacitance value of the carbon microcoil from the electrode, and outputting a detection signal based on the received change value,
The substrate is
a first upper surface region on which the electrode, the reactive layer, and the protective layer are disposed;
a second upper surface area on which the sensing element is disposed;
a third top surface area between the first and second top surface areas;
detection device. delete The method of claim 1,
The protective layer is
Further molding the substrate, the sensing element and the shielding layer
detection device. 4. The method of claim 1 or 3,
The protective layer is
comprising an adhesive film having an adhesive force;
detection device. Board;
an electrode disposed on the substrate;
a reaction layer disposed on the substrate to bury the electrode and including a carbon microcoil;
a protective layer disposed on the substrate and molding the reaction layer;
a shielding layer disposed under the substrate; and,
It is disposed on the substrate and comprises a sensing element connected to the electrode,
The electrode is
a first electrode having a positive polarity;
a second electrode part having a negative polarity;
The first electrode part,
a first feeding electrode;
A first floating electrode spaced apart from the first feeding electrode by a predetermined interval,
The second electrode part,
a second feeding electrode;
and a second floating electrode spaced apart from the second feeding electrode by a predetermined interval
detection device. 6. The method of claim 5,
The reaction layer is
a first reaction layer disposed on the substrate and filling the first electrode part;
a second reaction layer disposed on the substrate and filling the second electrode part;
The first reaction layer,
physically separated from the second reaction layer
detection device. 6. The method of claim 1 or 5,
The sensing element is
a sensing unit connected to the electrode and outputting a sensing signal according to a change in a capacitance value in the reaction layer transmitted from the electrode;
and a control unit configured to communicate with an electronic control unit of the vehicle to transmit the detection signal to the electronic control unit.
detection device. The method of claim 1,
The third upper surface region of the substrate,
In the passivation layer, the first and second upper surface regions are disposed with a different inclination.
detection device. 9. The method of claim 8,
The third upper surface region of the substrate,
bent with a certain curvature in the protective layer
detection device. 10. The method of claim 9,
The first upper surface area of the substrate,
disposed in parallel with the second upper surface area of the substrate in the passivation layer at a location spaced apart from each other by a predetermined distance
detection device.

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