KR20180117473A - Sensing device and wiper driving device - Google Patents

Abstract

According to an embodiment of the present invention, a sensing device comprises: a substrate; an electrode disposed on the substrate; a reaction layer disposed on the substrate to bury the electrode and having a carbon fine-coil; a protection layer disposed on the substrate and molding the reaction layer; and a sensing device disposed on the substrate and connected to the electrode. The sensing device receives a change value of a capacitance value of the carbon fine-coil from the electrode and outputs a sensing signal based on the received change value.

Description

TECHNICAL FIELD [0001] The present invention relates to a sensing device and a wiper driving device including the sensing device.

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

In recent years, automobiles have been widely popularized and various types of automobiles have been supplied to various age groups and ages. The technical trends of such automobile industry have been shifted from conventional mechanical viewpoints such as engines, And intelligence.

In recent years, as a part of electronicization and intelligence of such automobiles, a technique has been developed for a vehicle rain sensor that automatically controls the operation of a vehicle wiper according to a rainfall amount. Even if a driver does not operate a wiper during a rainy day, So that the operation of the wiper is automatically controlled.

A conventional vehicular rain sensor is provided with a light emitting portion and a light receiving portion inside a windshield of an automobile and an optical conduction detecting portion for determining the amount of rainfall using a change in light intensity of a light receiving portion caused by a change in refractive index of light caused by rain drops Method.

However, the conventional lane sensor of the optical conduction system is complicated in structure and installation, and the cost of components is high, resulting in an increase in production cost, and a measurement area is small and the influence of the pollutant is large, There was a problem.

In order to solve this problem, recently, a capacitive rain sensor has been developed which detects the amount of rainfall using a capacitance change of a condenser installed inside a windshield of an automobile. The configuration and sensing principle of a rain sensor using such a capacitive sensor Is described in detail in Document 1 below.

However, even in the case of the rain sensor disclosed in the above-mentioned [1], when a vehicle is exposed to a high frequency (RF) environment such as a radio communication area, noise of a high frequency noise generated by the external high frequency There is a problem that the sensing precision is lowered due to the influence.

Recently, as in [Document 2], by detecting both the rainfall amount, the high frequency noise and the wiper noise by using a plurality of condensers and by removing the high frequency noise and the wiper noise from the detected rainfall amount when calculating the actual rainfall amount, There has been developed a rain sensor for a vehicle that can detect rainfall more stably and precisely than a capacitive vehicle rain sensor according to the technology.

However, such a capacitive sensor has a low sensitivity and its application is extremely limited, and it is vulnerable to high temperatures and environmental pollution.

[Patent Document 1] Korean Patent No. 10-781744 (Registered on December 4, 2007)

[Patent Document 2] Korean Patent No. 10-0943401 (Registered on Feb. 12, 2010)

According to the embodiment of the present invention, there is provided a sticky type sensing device which does not require an external case or a mounting member.

Further, in the embodiment according to the present invention, a sensing device having a new structure and design is provided.

In addition, the embodiment of the present invention provides a sensing device including a carbon micro-coil capable of amplifying the rain sensing sensitivity.

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

In addition, in the embodiment of the present invention, a sensing device capable of minimizing signal interference by physically separating a reactive layer for embedding a positive electrode and a reactive layer for embedding a negative electrode is provided.

It is to be understood that the technical objectives to be achieved by the embodiments are not limited to the technical matters mentioned above and that other technical subjects not mentioned are apparent to those skilled in the art to which the embodiments proposed from the following description belong, It can 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 and embedding the electrode, the reaction layer comprising a carbon micro-coil; 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 a capacitance value of the carbon micro coils from the electrode, and generates a sensing signal based on the received change value Output.

In addition, the substrate may include a first upper surface region in which the electrode, the reaction layer, and the protective layer are disposed, a second upper surface region in which the sensing element is disposed, a third upper surface region between the first and second upper surface regions, .

The substrate further includes a shielding layer disposed on a lower surface of the substrate.

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

Further, the protective layer includes an adhesive film having an adhesive force.

The electrode includes a first electrode portion having a positive polarity and a second electrode portion having a negative polarity, wherein the first electrode portion includes a first feeding electrode, and a second electrode portion spaced apart from the first feeding electrode by a predetermined distance 1 floating electrode, and the second electrode portion includes a second feed electrode and a second floating electrode spaced apart from the second feed electrode by a predetermined distance.

The first and second feed electrodes are connected to the feed terminal. The first and second feed electrodes are connected to the feed terminal. The first and second feed electrodes are connected to the feed terminal, And is connected to the contact terminal.

The first feed electrode, the second feed electrode, the first floating electrode, and the second floating electrode are arranged to turn over the substrate a plurality of times.

The reaction layer may include a first reaction layer disposed on the substrate and embedding the first electrode portion and a second reaction layer disposed on the substrate and filling the second electrode portion, The reaction layer is physically separated from the second reaction layer.

A first partition wall disposed on the substrate, the first partition wall surrounding the first reaction layer; And a second partition wall disposed on the substrate, the second partition wall surrounding the second reaction layer.

The sensing element may include a sensing unit connected to the electrode and outputting a sensing signal according to a change in capacitance value in the reaction layer transmitted from the electrode, To the electronic control unit.

In addition, the third upper surface region of the substrate is arranged with a slope different from the first and second upper surface regions in the protective layer.

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

In addition, the first top surface region of the substrate is disposed in parallel at a position spaced apart from the second top surface region of the substrate within the protective layer.

According to another aspect of the present invention, there is provided a wiper driving apparatus including: a sensor including a carbon micro-coil and outputting a sensing signal according to a change in capacitance value formed by the carbon micro-coil; And a vehicle control unit that receives a sensing signal output from the sensor and determines a wiper driving condition according to the received sensing signal, wherein the sensor includes: a substrate; an electrode disposed on the substrate; And a control unit connected to the electrode and receiving a change value of capacitance value of the carbon micro coils from the electrode, wherein the change value of the capacitance value of the carbon micro coils is received from the electrode, And a protective layer for molding the substrate, the reaction layer, the shielding layer, and the sensing element, wherein the substrate includes a first electrode and a second electrode, A first upper surface region in which the reaction layer is disposed, a second upper surface region in which the sensing element is disposed, and a second upper surface region in which the sensing element is disposed, 3 includes a top surface region, and the third upper surface region of the substrate is bending has a constant curvature in the protective layer.

In addition, the first top surface region of the substrate is disposed in parallel at a position spaced apart from the second top surface region of the substrate within the protective layer.

The sensing unit may include 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, a second frequency generator for outputting a second frequency corresponding to a predetermined reference oscillation frequency, 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 in a predetermined filtering region.

According to the embodiment of the present invention, since the outer protective layer of the sensing device is formed of a film having an adhesive force, it can be easily attached to the structure without designing a special mechanism.

In addition, according to the embodiment of the present invention, since the entire production of the sensing device can proceed to the laminating process, the manufacturing process can be unified, and the manufacturing cost can be reduced by simplifying the process.

In addition, according to the embodiment of the present invention, the distance between the reaction layer of the sensing device and the front glass of the vehicle can be minimized, thereby improving the sensing sensitivity.

In addition, according to the embodiment of the present invention, by attaching the shielding sheet to the lower part of the insulating film, it is possible to reduce external noise and noise of the internal chip, thereby improving operational reliability.

According to the embodiment of the present invention, by further arranging the floating electrode in addition to the feed electrode in the reaction layer, it is possible to maximize the capacitance value generated at the time of sensing the rainwater, thereby improving the rainwater detection sensitivity.

According to the embodiment of the present invention, the distance between the feed electrode and the floating electrode can be minimized, or the feed electrode and the floating electrode can be extended so as to have a rectangular shape or a square spiral shape, thereby maximizing the change amount of the capacitance value And it is possible to improve the rain detection sensitivity.

In addition, according to the embodiment of the present invention, signal interference generated between the negative electrode and the positive electrode can be minimized by physically separating the reactive layer for embedding the negative electrode and the positive electrode, Can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart showing a process for producing a glass composition according to an embodiment of the present invention in the order of steps; FIG.
2 is a view showing a carbon micro-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 the operation principle of a sensing device using a glass composition 3 according to an embodiment of the present invention.
5 is a view illustrating a capacitor function of a carbon micro-coil according to an embodiment of the present invention.
6 is a diagram showing the evaluation of the reactivity of the glass composition (3) according to an embodiment of the present invention.
7 is a diagram showing the evaluation of the reactivity according to the content of the carbon micro-coil powder 1 and the thickness of the glass composition 3 according to the embodiment of the present invention.
8 is a side view showing a state where a sensing device is mounted on a windshield of a vehicle according to an embodiment of the present invention.
FIG. 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 a portion A in FIG.
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.
14 is a view illustrating a sensing apparatus according to a third embodiment of the present invention.
15 is a view illustrating a sensing apparatus according to a fourth embodiment of the present invention.
16 shows characteristics of the carbon micro-coil according to the embodiment of the present invention.
FIG. 17 is a view for explaining the sensing sensitivity of the two-line electrode structure according to the prior art, and FIG. 18 is a view for explaining the sensing sensitivity of the four-line electrode structure according to the embodiment of the present invention.
19 is a view showing a configuration of a wiper drive system according to an embodiment of the present invention.
20 is a diagram showing the configuration of the sensing unit 219 shown in FIG.
FIGS. 21 to 23 are diagrams illustrating changes in the difference frequency value according to the first embodiment of the present invention.
FIG. 24 is a diagram showing a change in the difference frequency value according to the second embodiment of the present invention. FIG.
25 to 28 are graphs showing the change characteristics of the carbon micro-coil according to the embodiment of the present invention.
29 and 30 show a case of the sensing device according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

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

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flowchart showing a process for producing a glass composition according to an embodiment of the present invention in the order of steps; FIG.

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 reaction layer (216) formed by embedding a plurality of electrodes (211) included in the sensing device (200). The reaction layer 216 has an inherent capacitance value of the carbon micro-coil. Then, the distance between the carbon micro coils changes due to a change in the force or dielectric constant applied by the object to be detected in contact with the windshield. Also, the capacitance value of the carbon micro coils varies with the variation of the distance. Accordingly, in the present invention, the sensing object is sensed based on the change amount of the capacitance value changed by the reaction layer 216.

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

Referring to Fig. 1, in order to prepare the glass composition (3), the blending process of the raw materials constituting the glass composition (3) is preferentially proceeded (step 1).

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

 First, for the compounding of the raw materials, the raw materials constituting the glass composition (3) are weighed 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 bonded to the carbon micro-coil powder 1 during the firing process of the glass composition 3 and is heated to a temperature lower than the reaction temperature of the carbon micro- To protect the carbon micro-coils grown by the fine coil powder (1).

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

Further, 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 may be a lead oxide-silicon oxide-tellurium oxide-zinc oxide (PbO-SiO 2 -TeO 2 -ZnO), a silicon oxide-tellurium oxide-bismuth oxide-zinc oxide-tungsten oxide (PbO-SiO2-TeO2-Bi2O3-ZnO-WO3), lead oxide-silicon oxide-tellurium oxide-bismuth oxide-zinc oxide-tungsten oxide TiO2-Bi2O3-ZnO-WO3), 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 oxides described above using conventional methods. For example, the metal oxides described above can be prepared by mixing in a specific composition. At this time, the mixing may be performed using a ball mill or a planetary mill. At this time, the mixed composition may be melted at 900 ° C to 1300 ° C and quenched at 25 ° C. The resultant product 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 contained within 90 to 99 wt%.

Next, a carbon micro-coil powder 1 constituting the glass composition (3) is prepared. The carbon micro-coil powder (1) includes carbon micro-coils.

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

Referring to FIG. 2, the carbon micro-coil powder 1 is an amorphous carbon fiber having a unique structure that can not be possessed by a fiber material, including a carbon micro-coil that is not a straight line but is rolled like a pig tail. In addition, the carbon micro coils have a supergiant elasticity extending to a length of 10 times or more of the original coil length.

The morphology of the carbon micro-coils has a 3D-helical / spiral structure and the crystal structure is amorphous.

In other words, the carbon micro-coils are formed by growing carbon fibers into a coil shape, and thus have a cross-sectional structure in which carbon fibers are grown in a coil shape.

Here, the carbon micro-coil has a property different from that of a carbon nanotube. That is, the carbon nanotube has a structure in which hexagonal carbon having a nanotube shape is connected.

On the other hand, the carbon micro-coil in the present invention has a form in which carbon is grown as a micro-unit coil by using a catalyst instead of a carbon-to-carbon structure.

That is, the carbon nanotubes acquire the measured value by using the characteristic that the impedance changes from the conductor to the non-conductor by using the characteristic that the carbon nanotubes become the conductor and the non-conductor according to the binding form of the element itself.

On the other hand, the carbon micro-coil according to the embodiment of the present invention is a coil formed of micro-unit carbon, and has characteristics of L that varies as the coil elongates and shrinks due to a change in force or permittivity, The characteristic of the C due to the distance, and the like change the impedance according to the interaction between the carbon micro coils.

That is, although the carbon micro-coil itself has the property of a conductor, the curing agent, epoxy resin, and the like have non-conductive characteristics. Due to the above characteristics, the carbon micro coils internally have inherent capacitance values. In addition, when the distance between the carbon micro coils varies due to the change of the force or the dielectric constant caused by the sensing object, the characteristic of the capacitance value of the carbon micro coils varies.

In other words, the carbon micro-coils have the characteristics of L-C-R, and thus have a frequency absorption characteristic, a heating characteristic, a proximity sensing characteristic, and a temperature characteristic when a certain condition is satisfied.

On the other hand, the carbon micro-coil powder (1) may be contained in an amount of 1 to 10% by weight.

In addition, the raw material constituting the glass composition (3) may further include a binder. The binder can be contained in the raw material constituting the glass composition (3) with an amount of not more than 1% by weight. The binder may be included in the raw material to increase the mixing uniformity between the glass frit 2 and the carbon microcoil powder 1. In addition, the binder may be selectively removed depending on the state of mixing between the glass frit 2 and the carbon micro-coil powder 1, or the content thereof may be controlled.

The raw material weighing according to the mixing ratio of the carbon micro-coil powder 1 and the glass frit 2 as described above can be performed through an electronic scale, EPMA (Electron Probe Micro-Analysis), SEM (Scanning Electron Microscope) .

Next, when the carbon micro-coils 1 and the glass frit 2 are weighed, a mixing process of mixing the glass frit 2 and the carbon micro-coils 1 may be performed .

The mixing process may be performed through a V-mixer, a ball-mill, and a super vibration stirrer. When the mixing process is completed, an evaluation process for the mixing process may be performed. The mixing step can be evaluated through EPMA (Electron Probe Micro-Analysis), SEM (Scanning Electron Microscope), electron microscope and particle size analyzer.

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

The plate forming step may include a step of pressing the compounded raw material. The pressing process may be carried out by a press or a hot press apparatus

The process conditions of the pressing process include a pressure condition of 3 ton to 5 ton, a time condition of 5 minutes to 10 minutes, and a temperature condition of ordinary temperature. When the pressing process is completed, the pressing process is evaluated. The evaluation of the pressing process can be carried out through the sintering density that appears as the raw material is press-formed into a predetermined shape by the plate forming process.

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

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

The sintering process may proceed in a sintering furnace and may be carried out under sintering conditions including an elevated temperature condition of 10 ° C / min, a sintering temperature condition of 450 ° C to 700 ° C, a holding time of 1 hour, have.

When the sintering process is performed, the evaluation process may be performed in the sintering process, and the evaluation process may proceed with the sintering density of the sintered material in the composition in which the sintering process is performed.

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

3, in the state where the glass composition 3 is initially mixed and mixed, the raw material constituting the glass frit 2 and the raw material constituting the carbon micro-coil powder 1 are mixed together, as shown in Fig. 3 (A) The constituent raw materials have only a mixed state.

If sintering is performed at a temperature close to the melting point of the raw materials under the sintering conditions as described above, bonding may be performed at the joint surface between the glass frit 2 and the carbon micro-coil powder 1, Are deposited to produce one composition that is interconnected.

As described above, when the sintering process proceeds, a reliability evaluation process for evaluating the produced glass composition (3) can be performed (Step 4).

At this time, the glass composition (3) can be polished before proceeding to the reliability evaluation step, and the polishing process is optionally skip-enabled.

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

That is, for the electrical evaluation of the glass composition (3), the process of measuring the output value of each produced glass composition (3) may be performed. At this time, the carbon micro-coil powder (1) may be contained in the glass composition (3) in different contents. For example, a general capacitance sensor (0 wt%) not containing the carbon micro-coil powder (1), a glass composition (3) containing the carbon micro coils powder (1) The glass composition 3 containing the carbon micro-coil powder 1 and the glass composition 3 containing 10 wt% of the carbon micro-coil powder 1 can be respectively evaluated.

The electrical evaluation can be carried out with an LCR meter capable of measuring the output value of the digital converter or the L value / C value / R value, which converts the capacitance value of the glass composition 3 into a digital value and outputs it .

The electrical evaluation may be performed by setting a capacitance value when a specific sensing object does not exist in the module area including the glass composition 3 as a reference value and when the specific sensing object enters the module area The value of the capacitance value of the capacitor can be increased.

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

Referring to FIG. 4, the carbon micro-coils grown by the carbon micro-coil powder 1 are contained in the glass composition 3.

A magnetic field is generated around the glass composition (3) when the sensing object comes close to a certain radius of the glass composition (3) or the sensing object touches the surface of the glass composition (3) .

Then, the arrangement of the carbon micro coils contained in the glass composition (3) is changed by the generated magnetic field, and the capacitance value of the glass composition (3) changes accordingly.

At this time, an electrode (to be described later) may be disposed on the surface of the glass composition 3. 15, 219) and a control unit (refer to FIG. 15, 200). The sensing unit 219 and the controller 200 control the capacitance value of the glass composition 3 through the electrodes And detects the state of the sensed object 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 a humidity according to the sensing object. Further, when the sensed object is moisture (for example, rainwater), the state of the sensed object may include the amount of the moisture.

In other words, when the sensing object approaches the glass composition (3), electrostatic induction occurs. The carbon micro coils contained in the glass composition (3) function as capacitors in series or in parallel within the electrode.

5 is a view illustrating a capacitor function of a carbon micro-coil according to an embodiment of the present invention.

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

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

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

6 shows a comparison result of the capacitance change value of the capacitance sensor manufactured by the glass composition 3 including the carbon micro-coil powder 1 according to the embodiment of the present invention and the capacitance change value of the general capacitance sensor Lt; / RTI >

For the experiment, four samples were prepared, the first sample consisted of a glass composition (3) containing an A-content of carbon micro-coil powder (1) and a second sample consisted of a B-content of carbon micro- (3), and the third and fourth samples are capacitive sensors having different capacitance characteristics from each other without including the carbon micro-coil powder (1).

The capacitance change values of the first to fourth samples are shown in the following table.

Sample 1
(CMC validation # 1) Sample 2
(CMC validation # 2) Sample 3
(No CMC # 1) Sample 4
(No CMC # 2) Distance 1 1323 1374 859 897 Distance 2 1066 1029 654 672 Distance 3 708 687 450 464 Distance 4 238 232 153 157 Distance 5 32 31 17 17

Referring to FIG. 6 and Table 1, it can be seen that there is a great difference in the reactivity of the carbon micro coils depending on the distance depending on the distance.

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

As described above, in the case of a sensor including a carbon micro-coil, the capacitance of the sensor is about 1.55 times larger than that of the conventional sensor, and thus it is possible to provide a sensing device with higher sensitivity.

7 is a diagram showing the evaluation of the reactivity according to the content of the carbon micro-coil powder 1 and the thickness of the glass composition 3 according to the embodiment of the present invention.

7 shows a comparison result of the capacitance change value which is obtained by changing the content of the carbon micro-coil powder 1 according to the embodiment of the present invention and changing the thickness of the glass composition 3 thus produced .

Table 2 shows the results of the experiment.

3 wt% 5 wt% 7 wt% 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

7 and Table 2, it was confirmed that the degree of reactivity varies depending on the presence / absence of the carbon micro coils and the contents thereof. In addition, it was confirmed that the above-mentioned reactivity varies according to the thickness of the glass composition (3) prepared with the carbon micro-coil powder (1).

At this time, if the content of the carbon micro-coil powder (1) is more than 10% by weight, it is unsuitable for the manufacturing process due to the increase in viscosity, and the content of the carbon micro coils powder (1) is limited to 10% by weight.

As a result of the experiment, the carbon micro-coil powder (1) was contained in an amount of 7 wt%, and the best capacitance value was changed when the thickness of the glass composition (3) was 0.5T.

Hereinafter, the sensing device manufactured using the glass composition 3 as described above will be described. At this time, the sensing device may include a temperature sensor, a humidity sensor, a proximity sensor, and the like. In the following description, it is assumed that the sensing device is a rain sensor mounted on a vehicle.

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

8 to 11, a sensing device 200 is mounted on a windshield 100 of a vehicle. The sensing device 200 is installed so as to face the windshield 10 of the vehicle. The sensing device 200 senses the presence or absence of a rain drop falling on the windshield 10 or a change in the capacitance value according to the amount of the rain.

The sensing device 200 forms a sensing area at a predetermined position of the windshield 100 of the vehicle and senses information according to the state of the raindrops generated in the sensing area.

FIG. 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 a portion A in FIG.

9 and 10, the sensing device 200 includes a substrate 201, a terminal 211, a reaction layer 216, a sensing portion 218, a control portion 220, a protective layer 221, 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 is disposed on the inner surface of the windshield 100 of the vehicle so that the reaction layer 216 faces the sensor. The sensing device 200 senses the presence or absence of raindrops contacting the outer surface of the windshield 100 and the amount of change in capacitance according to the amount of raindrops, and provides information for driving the wipers. Here, the change amount of the capacitance value may mean an impedance change.

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

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

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

In addition, the substrate 201 may be a flexible substrate having a flexible property. In addition, the substrate 201 may be a curved or bended substrate. That is, the product including the substrate may be formed to have flexible, curved, or bent characteristics. Accordingly, the product including the substrate 201 according to the embodiment can 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 embedded in the reaction layer 216 and disposed on the substrate 201. A plurality of the electrodes 211 are formed. Preferably, the electrode 211 senses a change amount of a capacitance value generated as a sensing object approaches the reaction 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 embeds 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 reactive layer 216 includes a conductive material, and has a property that a capacitance value changes according to a change of a force or a dielectric constant.

In the first embodiment of the present invention, the change value of the capacitance generated between the electrodes is sensed through the two-line electrode structure including the first electrode 211a and the second electrode 211b, Lt; / RTI > At this time, the first electrode 211a and the second electrode 211b are power supply 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 both 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 and electrically connected. The sensing unit 219 senses the rainfall amount and the rainfall amount according to a sensing signal transmitted through the electrode 211, and transmits the detected rainfall amount to the control unit 220. The control unit 220 communicates with an ECU (Electronic Control Unit) 300 of the vehicle based on a signal transmitted through the sensing unit 219. At this time, the controller 220 and the ECU 300 of the vehicle can exchange signals through a LIN (Local Interconnect Network).

In other words, in general, REAL TERM of impedance is a resistance, POSITIVE IMAGINARY TERM is inductance, and NEGATIVE IMAGINARY TERM is capacitance, which is a sum of the resistance, inductance and capacitance.

Therefore, the sensing device 200, such as a general resistor, an inductor, and a capacitor, requires a pair of electrodes 211 to sense a change in capacitance value generated in the reaction layer 216.

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

When a specific force is applied to the surface of the front glass 100 or a substance having a specific permittivity is brought into contact with the surface of the front glass 100, the capacitance of the reaction layer 216 is increased. Accordingly, the resistance value and the inductance value Which is opposite to the capacitance value.

At this time, the sensed impedance value is a sum of the resistance value, the inductance value, and the capacitance, and the impedance value is linearly decreased according to the degree of the force or the dielectric constant applied to the surface.

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

Therefore, the sensing unit 219 senses a change state of the impedance value based on the reference value according to the differential amplification state, and when the degree of the change state is out of the threshold value, the sensing unit 219 drives the wiper to remove the raindrop .

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

That is, when the raindrops drop, the raindrops have a certain force on the windshield 100 or cause a change in the dielectric constant. Then, an impedance change occurs in the reaction layer 216 due to the change in the applied force or the dielectric constant.

At this time, the change amount of the impedance may correspond to the rainfall amount and the rainfall amount. That is, the force and the dielectric constant applied to the reaction layer 216 increase in proportion to the amount of rainfall, and the impedance change amount decreases in inverse proportion to the increase of the dielectric constant or the 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 internal clock of the sensing unit 219 A change occurs.

Then, a differential signal due to the differential amplification of the AFE of the sensing unit 219 is output according to the amplitude change of the internal clock. Then, when the differential signal is output, the differential signal is converted into a digital signal and transmitted to the ECU 300 of the vehicle through the control unit 220.

The ECU 300 of the vehicle recognizes the rainfall amount and the rainfall amount on the basis of the impedance change amount according to the digital signal transmitted, and when the rainfall occurs and the rainfall amount exceeds the critical point, .

Hereinafter, the 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 micro-coil. At this time, the reaction layer 216 itself can determine the rainfall amount and the rainfall amount according to the impedance change amount, and the measurement sensitivity also varies according to the shape of the electrode 211. Accordingly, in the first embodiment of the present invention, the electrode 211 including the first electrode portion and the second electrode portion bent at least once is formed.

Also, as described above, the impedance is composed of a real part and an imaginary part, and the imaginary part is composed of a positive imaginary part and a negative imaginary part, The sensing device 200 measures using two changes in characteristics of the positive inductive and negative capacitive.

That is, when the rain comes, the force applied to the windshield 100 of the vehicle varies depending on the amount of rain, and the amount of water (raindrops) existing in the windshield 100 also varies.

At this time, the carbon micro coils have a very fine coil group as the name implies, and they are dielectric materials having a dielectric constant. At this time, the force is measured by a change in the inductive component, that is, a change in the characteristics of the carbon micro coils, and the amount of water present on the windshield 010 is measured by a capacitive change due to a dielectric constant change.

In other words, each layer constituting the sensing device 200 serves as a dielectric having a specific dielectric constant, and if it is non-conductive as described above, a dielectric substance called water is newly present in the electrode, and a capacitive change is caused thereby ..

At this time, the real part can be adjusted according to the area of the reaction layer 216. Also, when the reaction layer 216 is in a non-exposed state, the impedance value changes due to inductive and capacitive changes as described above.

Therefore, in the embodiment, the change of the impedance value according to the change of the inductive and capacitive values of the sensing device 200 is detected to determine the rainfall amount and the rainfall amount.

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 for protecting the reaction layer 216 from external environmental factors. At this time, the protective layer 221 may be a film having adhesiveness. Accordingly, in the sensing device 100, the protective layer 221 has adhesiveness, and the protective layer 221 can be directly attached to the front glass of the vehicle with an adhesive member.

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 interrupts signal interference with an external circuit. The shielding layer 222 may shield the signal interference due to electromagnetic interference (EMI) noise.

The shield layer 222 may be formed on the upper surface of the substrate 201 and the lower surface of the substrate 201. The shield layer 222 may be formed on the lower surface of the substrate 201, 219 and the controller 220, 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 the impedance change of the reaction layer 216 generated according to the rainfall amount and the rainfall amount. It determines the rainfall and rainfall.

At this time, the sensing unit 219 detects whether the difference frequency between the oscillation frequency and the reference frequency belongs to the predetermined filtering region, and only when the difference frequency exists in the predetermined filtering region, And outputs the digital value.

However, the sensing unit 219 may output only a digital value corresponding to a sensing signal transmitted from the electrode. In this case, , The controller 220 may perform the following specific sensing operation.

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

The low-pass filter and the band-pass filter have different filtering frequencies.

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. The first electrode 211a and the second electrode 211b may be formed on the substrate 201 to have mutually symmetric shapes.

Each of the first electrode 211a and the second electrode 211b includes a first electrode portion formed in a vertical direction on the substrate 201 and a second electrode portion extending from a first end of the first electrode portion 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, the change range of the capacitance value generated in the reaction layer 216 may be changed according to the shape of the electrode 211.

Accordingly, in the present invention, in order to improve the variation range of the capacitance value of the reaction layer 216, the first electrode 211a and the second electrode 211b may be formed on the first electrode portion and the second electrode 211b, respectively, And is disposed on the substrate 201.

On the other hand, although not shown in the drawing, a circuit pattern (not shown) is disposed on the substrate 201. The circuit pattern serves as a wiring, thereby electrically connecting the electrode 211, the sensing unit 219, and the controller 220.

According to the embodiment of the present invention, since the outer protective layer of the sensing device is formed of a film having an adhesive force, it can be easily attached to the structure without designing a special mechanism.

In addition, according to the embodiment of the present invention, since the entire production of the sensing device can proceed to the laminating process, the manufacturing process can be unified, and the manufacturing cost can be reduced by simplifying the process.

In addition, according to the embodiment of the present invention, the distance between the reaction layer of the sensing device and the front glass of the vehicle can be minimized, thereby improving the sensing sensitivity.

In addition, according to the embodiment of the present invention, by attaching the shielding sheet to the lower part of the insulating film, it is possible to reduce external noise and noise of the internal chip, thereby improving operational reliability.

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 to 13, the sensing device 200 includes a substrate 201, terminals 206, electrodes 211, barrier ribs 212 and 213, a reactive layer 216, a conductive portion 217, A sensing unit 219, a sensing unit 219, a control unit 220, and a protective layer 221.

9, the structures of the electrode 211 and the reaction layer 216 are different, and accordingly, the barrier ribs 212 and 213 are additionally provided in the first embodiment, .

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.

A plurality of the electrodes 211 are formed. The electrode 211 senses a change amount of a capacitance value generated as the sensing object approaches the reaction 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 include a main electrode and a sub electrode, respectively.

In other words, the first electrodes 207 and 209 include a first feeding electrode 207 to be fed and a first floating electrode 209 to be floated around the first feeding electrode 207. The second electrodes 208 and 210 include a second feed electrode 208 to be fed and a second floating electrode 210 to float around the second feed electrode 208.

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

The first floating electrode 209 and the second floating electrode 210 are disposed closely to the first feed electrode 207 and the second feed electrode 208, Thereby increasing the rate of change of the capacitance value.

The general line shape of the two-line electrode structure senses the amount of rainwater with only a capacitance change value occurring between the first feeding electrode 207 and the second feeding electrode 208. However, such an electrode structure has a relatively low difference between the capacitance value when no rain and the capacitance value when it is raining, which makes it difficult to secure fine sensing sensitivity. Here, the two-line electrode structure in FIG. 10 means that the electrode 211 includes only the first electrode portion except for the second electrode portion.

That is, the two-line electrode structure including only the first feed electrode 207 and the second feed electrode 208 in the form of a straight line has a typical antenna structure, in which the entire wavelength of the two- The EMC (Electro Magenetic Compatibility) issue occurs.

In addition, the mechanism of a general sensing device measures the amount of change in proportion to the amount of capacitance change relative to the basic capacitance value. At this time, in order to increase the sensing sensitivity, the basic capacitance value must be lowered or the capacitance variation amount must be increased. However, in the two-line electrode structure, there is a limitation in lowering the basic capacitance value or increasing the capacitance variation amount.

Therefore, in the second embodiment of the present invention, the first floating electrode 209 disposed closely to the first feeding electrode 207 is disposed around the first feeding electrode 207 as described above. A second floating electrode 210, which is disposed closely to the second feed electrode 208, is disposed around the second feed electrode 208.

The first floating electrode 209 and the second floating electrode 210 are spaced apart from the first feed electrode 207 and the second feed electrode 208 by a predetermined distance.

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

The distance between the first floating electrode 209 and the first feeding electrode 207 may be minimized while the interval 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 disposed closely to each other with a predetermined distance therebetween. The first floating electrode 209 and the first feeding electrode 207 may be arranged to turn at least once in a rectangular shape on the substrate 201 so as to have a maximum length within a limited space. have. 9, when the sensing device 200 is viewed from above, the first floating electrode 209 and the first feeding electrode 207 may have a rectangular shape or a square spiral shape, respectively, as shown in FIG. .

More specifically, the first feeding electrode 207 may be turned by a plurality of turns in a rectangular shape or a square spiral shape at the other end disposed in the reaction layer 216 at one end connected to the power supply terminal 202. That is, the first feeding electrode 207 may be turned a plurality of times such that the first feeding electrode 207 turns linearly at one end, changes its path at a right angle to form a square shape, and turns inside at a second turn. At this time, in the drawing, the first feeding electrode 207 is arranged to be turned by 16 times, but the present invention is not limited thereto.

The first floating electrode 209 may have the same shape as the first feeding electrode 207 at a position spaced apart from the first feeding electrode 207 by a predetermined distance. That is, the first floating electrode 209 may be turned by a plurality of turns in a rectangular shape or a square spiral shape at the other end disposed in the reaction layer 216 at one end connected to the ground terminal 204. At this time, the first floating electrode 209 is arranged to be turned by 14 turns on the drawing, but the present invention is not limited thereto.

The first feeding electrode 207 may be disposed at the outermost portion of the reaction layer 216 and the first floating electrode 209 may be closely disposed within the first feeding electrode 207.

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 the other end of the first floating electrode 209 is arranged in the reaction layer 216, An electrode portion including the other end of the first feeding electrode 207 and an electrode portion including the other end of the first floating electrode 209 are disposed facing each other.

The second feeder electrode 208 may be turned by a plurality of turns in a rectangular shape or a square spiral shape at the other end disposed in the reaction layer 216 at one end connected to the power supply terminal 203. That is, the second feeding electrode 208 may be turned a plurality of times such that the second feeding electrode 208 extends linearly at one end, changes its path at right angles to form a rectangular shape, and makes a second turn at the inner side. At this time, in the drawing, the second feed electrode 208 is arranged to be turned by 16 turns, but the present invention is not limited thereto.

The second floating electrode 210 may have the same shape as that of the second feed electrode 208 at a position spaced apart from the second feed electrode 208 by a predetermined distance. That is, the second floating electrode 210 may be turned by a plurality of turns in a rectangular shape or a square spiral shape at the other end disposed in the reaction layer 216 at one end connected to the ground terminal 205. At this time, the first floating electrode 210 is arranged to be turned by 14 turns on the drawing, but the present invention is not limited thereto.

The second feed electrode 208 may be disposed at the outermost portion of the reaction layer 216 and the second floating electrode 210 may be closely disposed within the second feed electrode 208.

9, the other end of the second feeding electrode 208 and the other end of the second floating electrode 210 may not be turned at the same position, The turn ends so that the electrode portion including the other end of the second feed electrode 208 and the electrode portion including the other end of the second floating electrode 210 are disposed to face each other.

On the other hand, the reaction layer 216 is disposed on the substrate 201, thereby embedding the electrode 211 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 both 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 that a capacitance value changes 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 a carbon microcoil having a spring shape, which is the glass composition 3 described above.

The reaction layer 216 may have a capacitance value due to a force applied by a specific substance on the surface of the front glass 100 to which the sensing device 200 is attached or a dielectric constant of the specific substance.

The electrode 211 senses a change in capacitance value of the reaction layer 216 and transmits a sensing signal corresponding to the change in the capacitance value to the sensing unit 219.

At this time, 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 the electrode having the negative polarity is embedded. On the substrate 201, the first reaction layer 214 and the second reaction layer 215 are physically separated from each other. In other words, the first reaction layer 214 and the second reaction layer 215 are disposed on the substrate 201 without contacting each other.

That is, the first electrode unit including the first feed electrode 207 and the first floating electrode 209 is electrically connected to the second electrode including the second feed electrode 208 and the second floating electrode 210, And has a polarity different from the polarity. Accordingly, when the first electrode part and the second electrode part are disposed in the same reaction layer 216, SNR (Signal to Noise Ratio) is deteriorated due to signal interference between the electrode parts.

Accordingly, in the present invention, the first reactive layer 214 for embedding the first electrode portion including the first feed electrode 207 and the first floating electrode 209, and the second reactive electrode 214 for covering the second feed electrode 208 and the And the second reaction layer 215 filling the second electrode portion including the second floating electrode 210 are physically separated from each other, the SNR can be improved.

On the substrate 201, partition walls 212 and 213 surrounding the reaction layer 216 are disposed. The partition walls 212 and 213 may include a first partition wall 212 surrounding the first reaction layer 214 in accordance with separation of the reaction layer 216 and a second partition wall 212 surrounding the second reaction layer 215. [ And may include a second partition 213.

The first and second barrier ribs 212 and 213 may serve as partitions or dams for physically separating the reaction layer 216 from the first reaction layer 214 and the second reaction layer 215 have. The first and second barrier ribs 212 and 213 may be formed for dispensing while maintaining the flatness of the upper surfaces of the first reaction layer 214 and the second reaction layer 215. The first and second barrier ribs 212 and 213 may be formed of silicon.

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 barrier ribs 212 and 213 are spaced apart from each other by exposing the upper surface of the substrate 201 at least partially. Accordingly, the protective layer 221 may be disposed to cover the upper surface of the exposed substrate 201.

The sensing unit 219 and the control unit 220 are disposed on the upper surface of the substrate 201. The sensing unit 219 and the control unit 220 have already been described in the first embodiment and will not be described here.

14 is a view illustrating a sensing apparatus according to a third embodiment of the present invention.

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, .

Here, the sensing device of the third embodiment of the present invention differs from the sensing device of FIG. 9 only in the structure of the protective layer 221, but the other parts are substantially the same. Although 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. 11 Structure can also be applied.

In the first embodiment of the present invention, the protective layer 221 covers the reaction layer 216 only.

In contrast, in the third embodiment of the present invention, the protective layer 221 is formed on the upper surface and the side surface of the substrate 201, the lower surface of the shielding layer 222, And may cover the sensing unit 219 and the control unit 220 disposed on the substrate 201.

In other words, the protective layer 221 covers all the sensing devices including the substrate 201, the electrode 211, the protective layer 221, the sensing portion 219, the control portion 220 and the shield layer 222 .

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

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

15 is a view illustrating a sensing apparatus according to a fourth embodiment of the present invention.

15, the sensing apparatus 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 sensing device of the fourth embodiment of the present invention differs from the sensing device of FIG. 9 only in the structure of the protective layer 221, but the other parts are substantially the same. Although 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. 11 Structure can also be applied.

In the first embodiment of the present invention, the protective layer 221 covers the reaction layer 216 only. In contrast, in the fourth embodiment of the present invention, the protective layer 221 is formed on the upper surface and the side surface of the substrate 201, the lower surface of the shielding layer 222, And may cover the sensing unit 219 and the control unit 220 disposed on the substrate 201. In other words, the protective layer 221 covers all the sensing devices including the substrate 201, the electrode 211, the protective layer 221, the sensing portion 219, the control portion 220 and the shield layer 222 .

The protective layer 221 may be a sealing member, thereby protecting the components disposed therein from external contamination. In addition, the protective layer 221 may have adhesive strength, 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 is a flexible substrate, but the substrate 201 is disposed in the protective layer 221 with a flat plate shape.

On the other hand, the substrate 201 in the fourth embodiment of the present invention includes a bended region at least partially folded in the protective layer 221.

The substrate 201 may include a first region 201a in which the electrode 211 and the reaction layer 216 are disposed and a second region 201b in which the sensing portion 219 and the control portion 220 are disposed. And a third region 201b between the first and second regions 201a and 201c.

At this time, 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 protective layer 221 fixes the substrate 201 so that the substrate 201 remains bent around the third region 201c. In other words, the first region 201a and the second region 201c of the substrate 201 are disposed facing each other with respect to the third region 201b. At this time, since the substrate 201 is flexible, the third region 201b can not be maintained in the bend state. Therefore, the protective layer 221 is disposed so as to surround the entire area of the substrate 201 in a state where the third area 201b is bent, and the third area 201b is bent So that it can be maintained.

The shielding layer 222 disposed below the first region 201a and the shielding layer 222 disposed below the second region 201c are disposed directly opposite to each other with a predetermined gap therebetween. In addition, the protective layer 221 is disposed within the shielding region of the shielding layer 222.

The shield layer 222 under the first region 201a, the protective layer 221, and the second region 201c are formed between the first region 201a and the second region 201c of the substrate 201, And a shielding layer 222 below the region 201c are sequentially disposed.

The first region 201a of the substrate 201 including the electrode 211 and the protective layer 221 and the second region 201b of the substrate 201 including the sensing portion 219 and the control portion 220 The noise can be completely blocked between the second regions 201c, and the operation reliability can be improved accordingly.

In addition, in the present invention, the substrate 201 is formed in a bendable manner and then directly attached to the front glass 100 of the vehicle using the protective layer 221, thereby providing a slim and light sensing device .

16 shows characteristics of the carbon micro-coil according to the embodiment of the present invention.

As shown in FIG. 16, the carbon micro-coil has a first inductance value at normal times, and the inductance value decreases as a force or a dielectric constant is applied to the carbon micro-coil.

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

That is, the inductance value has a relatively small reduction amount when the rainwater comes into contact with the carbon micro coils, and when the human body, such as a human being, makes contact with the rainwater, When the substance is in contact, the amount of reduction is higher than in the case where the rainwater or the human body is in contact with the rainwater.

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

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

Referring to FIG. 17, the sensing unit 219 generates a first frequency f1 and outputs a capacitance value Cs corresponding to the internal capacitance Cr and the capacitance Cs of the reaction layer 216 And the final change amount is output according to the change amount.

At this time, the change ratio when the rain is not present in the windshield 100 and the change ratio when it is raising are shown below.

Ro = Cs / Cr: Change ratio when there is no rain

Rr = (Cs + Cr) / Cr:

Here, Cs is a capacitance value in the reaction layer 216, Cr is a reference capacitance value in the sensing portion 219, and? Cr is a capacitance value that can be further generated in the case of rain.

As described above, under the same Cr condition, when the Cr is increased to the maximum possible value, the Rr increases accordingly, and the sensing unit 219 signals the rate of change according to the increasing Rr.

18 (a) shows capacitance values that can occur in the upper and lower directions of the sensing device 200 according to the embodiment of the present invention, and FIG. 18 (b) A capacitance value that can occur in the lateral direction of the substrate 200 is shown.

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

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

Here, C0 and C1 are common to the four-line electrode structure of the present invention and the conventional two-line electrode structure, and thus are excluded from the following comparison.

In the present invention, the floating electrode is applied in addition to the feed electrode as described above to maximize Δ Cr, which is a value of capacitance that is further generated when the ratio is increased.

In the following, the conventional two-line electrode structure in the case of no rain and the case of rain are compared with the four-line electrode structure of the present invention as follows.

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

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

: Change ratio of the conventional two-line electrode structure when no rain is present

Here, Cs1 denotes a capacitance value in the reaction layer 216 of the two-line electrode structure, Cr denotes a reference capacitance value in the sensing portion 219, Ro denotes a variation ratio of the capacitance value when no rain is present, .

(2) Cs1 = C21 + Cr21, Rr = (C21 / Cr) + (Cr21 / Cr)

: Change ratio of the conventional two-line electrode structure at the time of rain

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

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

: Change ratio of the 4-line electrode structure of the present invention when no rain is present

Here, Cs1 denotes a capacitance value in the reaction layer 216 of the four-line electrode structure, Cr denotes a reference capacitance value in the sensing portion 219, Ro denotes a variation ratio of the capacitance value when no rain is present, .

(2) Cs2 = C21 + Cr21 + ((C31 +? Cr31) / (C32 +? Cr32) /

Cr = (C21 / Cr) + (Cr21 / Cr) + ((C31 + Cr31) / (C32 + Cr32) /

: Change ratio of the 4-line electrode structure of the present invention at the time of rain

As described above, in the four-line electrode structure of the present invention, in comparison with the conventional two-line electrode, the floating electrode corresponding to "(C31 + Cr31) / (C32 + Cr32) / (C22 + Cr2) / Cr" There is a change in an additional capacitance value due to the change in the capacitance value, and the detection sensitivity can be improved based on the change in the capacitance value.

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

Referring to FIG. 19, the wiper drive system is largely divided into a sensing apparatus 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, an operation unit 400 that operates the operation of the wiper, and a motor 500 that drives the wiper.

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

The sensing unit generates a change in capacitance in the reaction layer 216 when the rain does not come to the front glass 100 as described above, and transmits a change signal to the sensing unit 219.

The sensing unit 219 generates a first frequency, generates a second frequency that varies according to a change in the capacitance value, and determines whether or not the rain is due to the difference between the first and second frequencies, do. The specific 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 thereby 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 a signal sensed by the sensing unit 219 to the ECU 300 To the control unit 301 in Fig.

At this time, the control unit 220 and the control unit 301 in the ECU 300 of the vehicle can exchange mutual information according to a LIN (Local Interconnect Network).

The LIN operates according to a master-slave principle. Its signal type and protocol (= format of digital information) are standardized. Here, the master-slave principle is a system in which one main master computer and a plurality of computers (slaves) connected and subordinate to the master computer share the tasks according to their data processing contents Also known as a master-slave system.

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

The operating unit 400 is installed in a specific area of a vehicle interior so that a driver can operate the wiper manually.

The motor 500 is connected to a wiper, thereby providing a driving force for operating the wiper.

The ECU 300 is connected to the sensing device 200 and the operation unit 400 and outputs a motor driving signal for controlling the operation of the wiper accordingly. To this end, the control unit 301 is connected to the sensing device 200, and receives the sensing signal output from the sensing device 200 accordingly. At this time, the sensing signal may have a specific digital value, and the control unit 301 may calculate whether or not it is raining based on the digital value, and calculate the amount of the ratio.

In addition, the control unit 301 determines whether a wiper operation signal is input from the operation unit 400. [ At this time, a communication unit 304 is disposed between the control unit 301 and the operation unit 400. The communication unit 304 transmits an operation signal input from the operation unit 400 to the control unit 301 according to a LIN (Local Interconnect Network) scheme.

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

The signal processing unit 302 processes a driving signal output through the control unit 301 and outputs a motor control signal corresponding to the driving signal.

The motor driving unit 303 drives the motor 500 using the driving signal processed through the signal processing unit 302. At this time, the motor driving unit 303 drives the motor 500 to control whether the motor 500 is driven or not, based on whether or not the rain, the operation signal is input, the amount of the ratio, And outputs a signal.

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

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.

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

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

Preferably, the first frequency generator 2191 is configured to generate an oscillating frequency that varies depending on a change in the inductance value of the carbon micro coils using the carbon micro coils and the capacitors constituting the sensing unit.

That is, the first frequency generator 2191 uses the carbon micro coils attached to the windshield to oscillate the oscillation frequency by the sensing unit.

In other words, the inductance value of the carbon micro coils 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 slight change, and accordingly, the filter 2194 is configured as a low-pass filter in the first embodiment of the present invention.

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

At this time, 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 in a state in which no rain occurs in the sensing unit .

When the rainfall occurs in the sensing unit, the difference between the first frequency and the second frequency increases according to the rainfall amount, and the rainfall amount can be determined based on the difference.

If the inductance of the carbon micro-coil included in the sensing unit is L and the capacitance of the capacitor is C, the first frequency (? ₀ ) generated by the first frequency generator 2191 is expressed by Equation (1).

The first voltage value V ₀ corresponding to the first frequency generated by the first frequency generator 2191 is expressed by Equation 2 below.

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 and receives a first frequency generated by the first frequency generator 2191 and a second frequency generated by the second frequency generator 2192 And outputs the difference value corresponding to the difference of the second frequency generated in the second frequency.

At this time, the difference value Vdmod generated in the difference frequency generator 2193 is expressed by Equation (4) below.

The reason why the difference value is equal to Equation (4) is that when no rainfall occurs in the sensing unit, the difference between the first frequency generated by the first frequency generator 2191 and the second frequency And 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 a filtered output value.

At this time, the filter 2194 has a filtering region corresponding to a frequency range of a predetermined size, and filters the output value of the difference frequency generator 2193 in the filtering region.

Here, the filtering region may be determined by the type of the filter 2194 and the change characteristics of the carbon micro coils appearing when rainfall occurs in the sensing unit.

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

On the other hand, the type of the filter 2194 can be determined by the structure of the carbon micro coils.

That is, the inductance value of the carbon micro-coil changes finely without changing within a large range according to the rainfall amount and the rainfall amount, and the first frequency generator 2191 generates the first frequency The filter 2194 may be configured as a low pass filter when there is no significant difference between the first frequency and the second frequency generated by the second frequency generator 2192.

If the first frequency generated by the first frequency generator 2191 is greatly different from the second frequency generated by the second frequency generator 2192 according to the variation of the inductance value of the carbon micro coils, The filter 2194 may be a band-pass filter.

In other words, the type of the filter 2194 may be determined by a structure such as an area of the carbon micro coils 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 the digital value.

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

Referring to FIG. 21, when the dielectric material does not change without contacting a specific material with the sensing unit, a first frequency generated by the first frequency generator 2191 and a second frequency generated by the second frequency generator 2192 The second frequency that occurs may have the same frequency.

Therefore, the output value filtered by the filter 2194 according to the output value output from the difference frequency generator 2193 in the absence of the rainfall is almost the DC voltage level.

22, when a dielectric material changes due to a specific substance contacting the sensing unit, and the contact material is rainwater due to rainfall, the output value filtered by the filter 2194 is stored in a predetermined filtering area A frequency shift occurs.

In other words, when the inductance value of the carbon micro-coil of the sensing unit changes as rainfall occurs, a change in the first frequency generated in the first frequency generator 2191 occurs, And the second frequency.

At this time, the difference frequency between the first frequency and the second frequency increases according to the intensity (rainfall) of the generated rainfall.

Accordingly, in the embodiment of the present invention, the rainfall amount can be determined according to the difference frequency value between the first frequency and the second frequency. In other words, in the embodiment of the present invention, the rainfall amount and the rainfall amount are determined according to the frequency domain variation according to the signal output from the filter 2194.

Here, the difference between the first frequency and the second frequency may be caused by rainfall or moisture due to rainfall, or may be caused by other foreign matter.

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

Here, the carbon micro coils have different degrees of change in inductance value due to rainfall, and degree of change in inductance value due to foreign substances such as human body, paper, stone, and metal materials.

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

Therefore, it is possible to distinguish whether the difference between the first frequency and the second frequency is caused by rainfall or by a foreign object according to a variation threshold of the inductance value (change characteristics of carbon fine coils).

In the embodiment, the filtering region of the filter 2194 is determined according to the change characteristics of the carbon micro coils generated by the respective materials, and the difference between the first frequency and the second frequency in the determined filtering region It is possible to selectively drive the wiper.

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

At this time, since the difference frequency is not included in the filtering area as shown in Fig. 19, the wiper is not driven in such a case.

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

24, if the design of the sensing unit is such that the first frequency is different from the second frequency in the case where the rainfall does not occur and the degree of increase / decrease of the first frequency in the rainfall occurrence is large, The filter 2194 may be a band-pass filter.

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

The rainfall amount and the rainfall amount can be determined according to the degree of movement of the difference frequency occurring in accordance with the change of the difference frequency in the filtering area.

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

25 to 28 are graphs showing the change characteristics of the carbon micro-coil according to the embodiment of the present invention.

Referring to Fig. 25, the carbon micro-coils are connected to each other according to a stone, a paper, a servo motor, a cell phone 1 (power off state), a cell phone 2 (power on state), a cell phone 3 It has different changing characteristics.

In other words, the carbon micro-coils generate different output values depending on the material.

As the output value of the carbon micro coils changes, different changes occur depending on the contact area and the contact direction even if the same rotation is made. As the size of the stones increases, the weight and the contact area increase and the output value increases.

Even when a non-magnetic material such as paper or a magnetic material such as a servo motor is brought into contact with the magnetic material, a large change in the output value occurs without the influence of the magnetic field.

Referring to FIGS. 26 and 27, the output values of the carbon micro-coils according to the present invention are clearly distinguished when the human body is in contact with the water and when water is in contact with the rain.

That is, the output value of the carbon micro-coil has a negative value in the case of human body contact and a positive value in the case of water contact such as rainfall.

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 determined by the contact of the human body based on the characteristic of the carbon micro- Whether it has occurred or is caused by rainfall.

Accordingly, in the present invention, the reaction region of the sensing device 200, that is, the filtering region of the filter 2194, is determined based on the characteristics of the carbon fine coils reacted by the rain.

Therefore, the present invention can operate only when the sensing unit senses the rainfall using the characteristic of the carbon micro-coil, and can not operate the wiper when a change is detected by a foreign body such as a human body.

That is, in general, although the driver operates the wiper operation by auto, children often touch the rain sensor placed on the windshield front due to curiosity. According to the related art, in the above case, There was a risk of injuring young children.

However, according to the present invention, even when a difference occurs between the first frequency and the second frequency in the case where the human body touches such a child, the operation of the wiper is not performed, thereby further securing safety.

As described above, according to the present invention, the rainfall amount and the rainfall amount are determined based on the variation value of the oscillation frequency caused by the change of the inductance of the carbon micro-coil.

Meanwhile, in the conventional technique using the conventional optical system, the optical signal perceived by the photodiode differs according to the external illuminance, regardless of the same rainfall amount. Therefore, an optical sensor for correcting the optical signal must be additionally applied. It is necessary to additionally apply a sensor to prevent malfunction when a specific level of light is injected. Therefore, a complementary means for verification of malfunction due to changes in the external environment is indispensably required.

In addition, in the conventional technology using the conventional impedance method, it is necessary to develop a separate circuit algorithm software so that the rain sensor does not react at a sensing level exceeding a certain critical point, and a specific level of Sensing level database should be developed. In order to prevent wiper malfunction, it is essential to prevent wiper malfunction by approaching the rain sensor of certain foreign objects 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 the cost.

In addition, according to the present invention, it is possible to detect rainfall and rainfall even with a small change in inductance, so that it is possible to detect a low level of rainfall and to avoid foreign matter on the windshield in a circuit without applying a separate software algorithm for avoiding foreign matter can do.

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

Referring to FIG. 28, the first frequency generator 2191 generates a first frequency according to an inductance value of a carbon micro-coil constituting the sensing unit (Step 10).

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

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, The difference frequency of the two frequencies is output (step 12).

Accordingly, the filter 2194 filters the difference frequency to determine whether the difference frequency exists in a predetermined filtering region (step 13).

If the difference frequency is within the predetermined filtering region, the analog-to-digital converter 2195 generates and outputs an output value corresponding to the difference frequency. The control unit receives the output value, and detects whether the rainfall is due to the rainfall amount based on the received output value (step 14).

Then, the control unit determines the 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, if the received difference frequency does not exist in the predetermined filtering region, the filter 2194 does not output an output value corresponding to the received difference frequency, and ignores the received difference frequency (16 step).

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

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

29 and 30, the sensing device 200 includes a case 201 having an accommodation space for accommodating the electrode 201, the barrier ribs, the reaction layer, the sensing unit, and the control unit, (221). The case 221 constitutes the protective layer 221, and thus the same reference numerals are given. Preferably, the case 221 may be used in place of the protective layer 221 in FIG.

The case 221 includes a first case 2211 having an accommodation space therein and accommodating the sensing device 200 in the accommodation space and a second case 2211 disposed below the first case 2211, And a second case 2212 covering the lower area of the first case 2211.

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

The outer surface of the first case 2211 directly contacts the windshield 100 provided in the vehicle. 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 front glass 100 can directly contact each other.

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

The first case 2211 includes a side portion 22112 bent substantially vertically downward from a side end of the upper surface portion 22111 and extending 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 22111 of the scum. The height of the side portion 22112 may correspond to the height of the sensing device.

On the inner surface of the side portion 22112, an insertion groove 22114 recessed in the outward direction of the side portion 22112 is formed. A plurality of the insertion grooves 22114 are formed in the side portion 22112. The hook 22123 formed in the second case 2212 is inserted into the insertion groove 22114 so as to correspond to the position of the hook 22123 and the number of the hook 22123 .

Meanwhile, the side portion 22112 may be composed of four pieces. That is, the upper surface portion 22111 may have a rectangular shape, and the side surface portion 22112 may extend vertically downward from the four ends of the upper surface portion 22111.

At this time, at least one of the side portions 22112 is formed with a first opening portion 22115 in which the lower portion of the side portion 22112 is recessed upward. The first opening 22115 exposes at least a part 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 surface portion 22122 bent upward from the lower surface portion 22121.

At this time, the outer surface and the inner surface of the lower surface portion 22121 do not have a flat shape, and the inner surface gradually increases from left to right. In other words, the lower surface portion 22121 has a predetermined inclination angle and may have a shape in which the height gradually decreases from left to right. The lower surface 22121 may have an inclined shape corresponding to an inclination angle of the front glass 100 to which the first case 2211 is attached.

The side surface portion 22122 may extend upward from the side edge of the bottom surface portion 22121. At this time, the upper surface of the side portion 22122 may be disposed on the same plane in the entire area. Accordingly, the height of the side portion 22122 may be different depending on the region. Preferably, the lower surface portion 22121 has different heights depending on positions, and accordingly, the side surface portions 22122 may have different heights depending on positions.

A hook portion 22123 protruding upward from the side portion 22122 is disposed on the side portion 22122 and the bottom portion 22121. The hook portion 22123 is fitted into the insertion groove 22114.

In addition, a second opening portion 22124 corresponding to the first opening portion 22115 is formed in at least one region of the side portion 22122. The second opening 2214 is engaged with the first opening 22115 to partly open the interior accommodating space of the first and second cases 2211 and 2212 so that the communication line is inserted.

According to the embodiment of the present invention, since the outer protective layer of the sensing device is formed of a film having an adhesive force, it can be easily attached to the structure without designing a special mechanism.

In addition, according to the embodiment of the present invention, since the entire production of the sensing device can proceed to the laminating process, the manufacturing process can be unified, and the manufacturing cost can be reduced by simplifying the process.

In addition, according to the embodiment of the present invention, the distance between the reaction layer of the sensing device and the front glass of the vehicle can be minimized, thereby improving the sensing sensitivity.

In addition, according to the embodiment of the present invention, by attaching the shielding sheet to the lower part of the insulating film, it is possible to reduce external noise and noise of the internal chip, thereby improving operational reliability.

According to the embodiment of the present invention, by further arranging the floating electrode in addition to the feed electrode in the reaction layer, it is possible to maximize the capacitance value generated at the time of sensing the rainwater, thereby improving the rainwater detection sensitivity.

According to the embodiment of the present invention, the distance between the feed electrode and the floating electrode can be minimized, or the feed electrode and the floating electrode can be extended so as to have a rectangular shape or a square spiral shape, thereby maximizing the change amount of the capacitance value And it is possible to improve the rain detection sensitivity.

In addition, according to the embodiment of the present invention, signal interference generated between the negative electrode and the positive electrode can be minimized by physically separating the reactive layer for embedding the negative electrode and the positive electrode, Can be improved.

The features, structures, effects, and the like described in the embodiments are included in at least one embodiment and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Accordingly, the contents of such combinations and modifications should be construed as being included in the scope of the embodiments.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention. It can be seen that the modification and application of branches are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that the present invention may be embodied in many other specific forms without departing from the spirit or essential characteristics thereof.

Claims (10)

Board;
An electrode disposed on the substrate;
A reaction layer disposed on the substrate and embedding the electrode, the reaction layer comprising a carbon micro-coil;
A protective layer disposed on the substrate and molding the reaction layer;
A shielding layer disposed under the substrate; And
A sensing element disposed on the substrate and connected to the electrode,
The sensing element comprises:
Receiving a change value of a capacitance value of the carbon micro coils from the electrode, and outputting a detection signal based on the received change value
Sensing device. The method according to claim 1,
Wherein:
A first upper surface region in which the electrode, the reaction layer, and the protective layer are disposed,
A second upper surface region in which the sensing element is disposed,
And a third upper surface region between the first and second upper surface regions
Sensing device. The method according to claim 1,
The protective layer may be formed,
Further molding the substrate, the sensing element and the shielding layer
Sensing device. 4. The method according to any one of claims 1 to 3,
The protective layer may be formed,
And an adhesive film having an adhesive force
Sensing device. The method according to claim 1,
The electrode
A first electrode portion having a positive polarity,
And a second electrode portion having a negative polarity,
Wherein the first electrode unit comprises:
A first feed electrode,
And a first floating electrode spaced apart from the first feed electrode by a predetermined distance,
Wherein the second electrode unit comprises:
A second feed electrode,
And a second floating electrode spaced apart from the second feed electrode by a predetermined distance
Sensing device. 6. The method of claim 5,
In the reaction layer,
A first reaction layer disposed on the substrate, the first reaction layer filling the first electrode portion,
And a second reaction layer disposed on the substrate and embedding the second electrode portion,
Wherein the first reaction layer comprises:
Physically separated from the second reaction layer
Sensing device. The method according to claim 1,
The sensing element comprises:
A sensing unit connected to the electrode and outputting a sensing signal according to a change in a capacitance value of the reaction layer transmitted from the electrode,
And a control unit for communicating with the electronic control unit of the vehicle and transmitting the detection signal to the electronic control unit
Sensing device. The method of claim 3,
The third upper surface region of the substrate,
Wherein the first and second upper surface regions are disposed with a different inclination from the first and second upper surface regions in the protective layer
Sensing device. 9. The method of claim 8,
The third upper surface region of the substrate,
The protective layer has a predetermined curvature and is bent
Sensing device. 10. The method of claim 9,
Wherein the first top surface region of the substrate comprises:
And a second upper surface region of the substrate within the protective layer
Sensing device.

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