JP2007219596A - Film sensor and glass structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an inexpensive and easily operable film sensor to be adhered to a glass with less influence of a setting place, and to provide a highly secure film for coping with "glass breakage" which frequently occurs as the crime of intrusion theft. <P>SOLUTION: This film sensor is characterized by forming a transparent first conductive layer at the whole part or one part of one surface of a transparent base material, and forming a second conductive layer at one part of the other surface, and connecting a detecting circuit for detecting the change of an electrostatic capacity between the first conductive layer and the second conductive layer to the first conductive layer and the second conductive layer. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  More particularly, the present invention relates to a film-like capacitance sensor that detects the presence of an object or human body that approaches or contacts the film.

  As a technique for detecting the capacitance of the window glass, a capacitance sensor is known in which a transparent electrode is directly formed on the window glass to detect rain or condensation. Further, Patent Document 1 proposes a glass sensor including a detection circuit that detects a change in capacitance between a conductive film and a grounded window frame.

On the other hand, for recent crime prevention, multilayer laminates and multilayer extruded films have been used. The background may be a significant increase in intrusion from windows. According to the “Crime Situation in the First Half of 2005” announced by the National Police Agency, the ratio of “Glass Break” is the highest in terms of crimes for burglary and this trend has continued for several years.

JP 2001-804857 A

  The above-described method is very well considered as an electrostatic glass sensor. Since the counter electrode of the conductive film serving as the detection electrode is determined to be a grounded glass window frame, the detection stability is excellent. However, the grounded frame of the glass window is the opposite electrode, so in order to equip the glass sensor, the entire window frame must be replaced, and a large-scale remodeling is required in an already built house. End up. In addition, since the size of the window frame is different in each house and there are glass windows of various sizes in the house, the capacity adjustment of the detection circuit becomes complicated during construction. On the other hand, a window frame made of resin has recently appeared for the purpose of keeping the window frame warm, preventing condensation, and reducing the weight, but there has been a problem that the resin window frame cannot be used as a counter electrode.

  In this invention, it is cheap, there is little influence of an installation place, and it is providing the film sensor bonded to the glass which can be constructed easily. Furthermore, it is to provide a film with high crime prevention property corresponding to “glass breaking”, which is a high percentage of crimes of theft and theft.

As a means to solve the problem,
In the first aspect of the present invention, a transparent first conductive layer is formed on all or a part of one surface of a transparent substrate, and a second conductive layer is formed on a part of the other surface.
And a detection circuit for detecting a change in electrostatic capacitance between the first conductive layer and the second conductive layer is connected to the first conductive layer and the second conductive layer. It is.

  The invention according to claim 2 is the film sensor according to claim 1, wherein the second conductive layer is formed in a frame shape along the outer periphery of the film sensor.

In the invention according to claim 3, the first conductive layer that is transparent is formed on a part of one surface of the transparent substrate, and the second conductive layer that is transparent is formed on a part of the same surface,
And a detection circuit for detecting a change in electrostatic capacitance between the first conductive layer and the second conductive layer is connected to the first conductive layer and the second conductive layer. It is.

  According to a fourth aspect of the present invention, one of the first conductive layer and the second conductive layer is formed in a frame shape along the outer periphery of the film sensor, and the other conductive layer is The film sensor according to claim 3, wherein the film sensor is formed inside.

  The invention according to claim 5 is characterized in that one or a plurality of transparent films are bonded to each other on one side or both sides of the transparent substrate via an adhesive layer or an adhesive layer. It is a film sensor in any one.

  The invention according to claim 6 is the film sensor according to any one of claims 1 to 5, wherein an adhesive layer or an adhesive layer is formed on the outermost layer.

  The invention according to claim 7 is the film sensor according to claim 6, wherein a hard coat layer is formed on the opposite surface of the adhesive layer or adhesive layer forming surface of the transparent substrate on which the adhesive layer or adhesive layer is formed. It is.

  The invention according to claim 8 is the film sensor according to any one of claims 1 to 7, wherein the transparent substrate has a multilayer structure.

  The invention described in claim 9 is the film sensor according to any one of claims 1 to 8, which has an ultraviolet absorption function and / or an infrared absorption function.

  The invention of claim 10 is a glass structure to which the film sensor is attached.

  The invention described in claim 11 is a glass structure characterized in that the glass structure is a window glass.

  Unlike the above-described method, in the present invention, since the counter electrode of the conductive film serving as the detection electrode is another conductive layer formed on the same surface or the opposite surface, the electrostatic film is formed within one film. Since the change of the capacity can be detected, the detection safety is excellent. Furthermore, in order to install the film sensor on the glass, it is not necessary to replace the window frame, and the already built house does not need to be modified and can be installed at low cost. In addition, even if the size of the window frame differs in each house, measure the size of the window in advance and cut the film sensor to the expected size before installation to adjust the capacity of the detection circuit Therefore, it can be installed very easily at the time of construction.

  Furthermore, the piercing strength and tear strength increase by making the transparent base material have a multilayer structure. By bonding the film sensor to the glass, it is possible to break the glass and make it difficult to enter the house or the building, and it is possible to provide a highly crime-proof film corresponding to “glass breaking”. The film having such a structure naturally has a high prevention function against glass scattering that occurs in the event of an earthquake disaster.

  The film sensor according to the present invention is bonded to a glass structure such as a window glass, so that an output signal is emitted from the detection circuit when approaching the glass structure, and an announcement or other security function is provided. It is effective in a wide range of applications. Further, it is also effective for a window glass such as a showcase or a show window, in which a window frame is often omitted from the viewpoint of design.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
1 and 3 to 8 are examples of the layer structure of the film sensor of the present invention.
FIG. 2 is an example of an equivalent circuit of the detection circuit.

  The film sensor according to the present invention is a sensor for a security system for a glass window of a residence, a store, a museum or an art museum, and further breaks the glass from a window glass or the like to which the sensor is bonded, and enters the room "glass breaking". It is the film sensor which has the high crime prevention function which provided high crime prevention property. Specifically, the first is a sensor function in which when an intruder approaches or comes into contact with a film sensor, an output signal is issued from the detection circuit and an alarm or the like is activated. The second is a crime prevention function that simultaneously has high resistance to piercing and tearing by using a film sensor as a central base material and a multilayer structure using an adhesive or adhesive.

The operation of the film sensor of the present invention will be described with reference to FIGS. As shown in FIG. 1, the film sensor 11 of the present invention has a transparent substrate 12, a transparent first conductive layer 13, and a second conductive layer 14 formed on a part of the opposite surface. And the detection circuit 15 which detects the change of the electrostatic capacitance between the 1st conductive layer and the 2nd conductive layer is connected to the 2nd conductive layer.
Here, the transparent first conductive layer 13 may be provided on the entire surface of the transparent substrate 12 or a part of the transparent conductive substrate 12 as long as a change in capacitance can be detected between the second conductive layers 14. Also good. The second conductive layer may be transparent or translucent, or may not be transparent. When the film sensor is used by being attached to a window material, it is preferable if the film sensor is transparent because good visibility can be obtained regardless of the position where the film sensor is provided. If it is not transparent, it is preferably provided at a position where the visibility is not adversely affected.

  The detection circuit is not particularly limited, but for example, a bridge circuit 21 as shown in FIG. 2 can be applied as the simplest and general method. The bridge circuit includes a capacitance 22, a capacitance 23, a capacitance 24, and a capacitance 25, and is electrically connected so that the capacitance 24 becomes the film sensor 11. A comparison circuit 27 is provided to measure the change in the electrical signal between the point A between the capacitance 22 and the capacitance 24 and the point B between the capacitance 23 and the capacitance 25. When the film sensor operates, an AC signal is sent from the AC signal transmission unit 26 to the bridge circuit.

  When the intruder 28 approaches or comes into contact with the film sensor, the indirector's stray capacitance 29 is added to the capacitor 24 and the capacitance changes, so that the electrical signal between the points A and B changes. When this amount of change exceeds a certain numerical level (threshold value setting), it operates as a film sensor by outputting an output signal. An alarm system (not shown) can be configured by combining with a controller or alarm device that receives an output signal, and can function as a security system.

  In the present embodiment, the capacitance 24 is the film sensor 11. A conductive layer (first conductive layers 13 and 33 in FIG. 1 and FIG. 3) that is to be a detection electrode is formed almost on the entire surface of the film so that it can be detected on the entire surface of the film sensor, and a conductive layer on the counter electrode side (FIGS. 3 requires that the second conductive layers 14, 34) be formed in the film sensor.

In the present embodiment, the bridge circuit 21 which is the simplest and general method as the detection circuit is applied. Under normal conditions (when the intruder is not approaching or in contact), the following relationship holds between the capacitance between the detection electrode and the counter electrode and the other capacitance of the bridge circuit. Is in a state,

Z1 ・ Z3 = Z2 ・ Z4

Capacitance 22: C1 impedance Z1 = 1 / ωC1
Capacitance 23: C3 impedance Z3 = 1 / ωC3
Capacitance 24: C4 impedance Z4 = 1 / ωC4
Capacitance 25: C2 impedance Z2 = 1 / ωC2
(Ω: angular frequency of AC signal vibration)

If this is a normal state, when an intruder approaches or comes in contact, Z3 changes and the equilibrium state collapses, and a difference can be detected. In a conventional window frame or the like, since the sizes of the window frame and the glass window are different, as a result, various values can be obtained in the mounted state (window frame shape or the like) of the capacitance 24 and the impedance Z3 itself. For this reason, it is necessary to adjust the capacitances 22, 23, and 25 for each window frame, and when adjusting at the time of construction, it becomes very complicated work. In contrast, in the present invention, since the detection electrode and the counter electrode are formed inside the film sensor, the value of the capacitance 24 is determined when the film sensor is manufactured, and extremely stable detection is possible without being affected by the installation environment. become.

The operation described above also applies to the film sensor 41 in which the transparent first conductive layer 43 and the transparent second conductive layer 44 shown in FIG. 4 are formed on the same surface of the transparent substrate 42. It is the same. Since the conductive layer is formed on the same surface, the film sensor 41 has a feature that the film sensor 41 is not affected by the thickness of the film as compared with the case where the conductive layer is provided on both surfaces of the transparent substrate.
Here, since the first conductive layer and the second conductive layer are transparent, good visibility can be obtained. The first conductive layer and the second conductive layer are not particularly limited in size and position as long as a change in capacitance can be detected between the two conductive layers.

  As shown in FIG. 3 or 5, the second conductive layer 34, 54 is formed on the window frame along the outer periphery of the first conductive layer 33, 53, thereby forming the first conductive layer 33, Since the distance from 53 to the second conductive layers 34 and 54 is uniform no matter what part, the detection is stable when an intruder approaches or comes into contact with the first conductive layers 33 and 53. . FIG. 3 shows an example in which the first conductive layer and the second conductive layer are provided on different surfaces of the transparent substrate, and FIG. 5 shows the first conductive layer and the second conductive layer of the transparent substrate. It is an example provided on the same surface.

<Transparent substrate>
The transparent base material includes a film-like inorganic compound molded product or an organic compound molded product having transparency, but an organic compound is preferable in terms of flexibility and light weight, and above all, processability, The shape of the molded product is not particularly limited as long as the surface is smooth. Moreover, if the transparent substrate has transparency, a homogeneous structure of a single organic compound molded product (for example, no optical anisotropy) is possible. On the other hand, in order to reinforce the strength of the film, a laminated film in which the same or different organic compound molded products are formed into a laminated structure with an adhesive / adhesive, or a film having a multilayer structure when the film is molded can be used.
It is preferable to use a film having a multilayer structure and a laminated structure because it can effectively prevent an intruder from entering.

  Examples of the organic compound having transparency include polyamide, polyimide, polypropylene, polyethylpentene, polyvinyl chloride, polyvinyl acetal, polyurethane, polyethyl methacrylate, polycarbonate, polystyrene, polyethylene sulfide, polyether sulfone, polyarylate, polyether. Examples thereof include plastics such as ether ketone, polyethylene terephthalate, polyethylene naphthalate, and triacetyl cellulose. In particular, plastic films such as polyethylene terephthalate, polyethylene naphthalate, and polycarbonate are preferable from the viewpoint of transparency, strength, price, and the like. The thickness of the plastic film is appropriately selected from the range of 25 to 300 μm depending on the intended use, and further, depending on the intended use, an ultraviolet absorbent, an infrared absorbent, a plasticizer, a lubricant, a colorant, and an antioxidant. Even if an agent, a flame retardant, or the like is added, there is no particular limitation and no limitation is imposed.

<Conductive layer>
The first conductive layer constituting the film sensor of the present invention, the second conductive layer is not particularly limited as long as it has electrical conductivity, but oxides such as indium, tin, zinc, titanium, niobium, cerium, antimony, And a composite oxide composed of two or more kinds of elements is preferable. A multilayer film in which silver and a silver alloy are narrowly supported with a transparent oxide can also be used.
Although the formation method is not particularly limited, the dry method includes a vacuum deposition method, an ion plating method, a plasma activated deposition method, a sputtering method, a CVD method, and the like, and the wet method uses sol-gel or conductive particles. There is a method of dispersing and applying a coating liquid.
In addition, when the above material is used, a transparent conductive layer can be formed. However, the second conductive layer is not necessarily transparent depending on the position to be provided.
For example, conductive ink containing a conductive metal, conductive metal particles, or the like, a carbon sheet, or the like can be used.

<Adhesive layer / adhesive layer>
The pressure-sensitive adhesive layer and the adhesive layer are used for film bonding and glass bonding. Although it is not clearly distinguished at the time of use, the surface to be bonded to glass is preferably an adhesive. The reason is that when the adhesive and glass are in contact with each other, the adhesive is effective against “glass breaking” to prevent the glass from scattering when the glass is broken, and the crime prevention performance is improved. The number of multilayers can also be appropriately determined according to the required characteristics. Adhesives include acrylic adhesives based on polyacrylic acid esters, silicone adhesives based on silicone resins, and rubber-based adhesives consisting mainly of natural rubber and synthetic rubber elastic bodies and tackifiers. There are agents. Although there is no restriction | limiting in the adhesive which can be used, As an adhesive in this invention, an acrylic type or silicone type adhesive is preferable. As the adhesive, epoxy resin, urethane resin, unsaturated polyester resin, vinyl ester resin and the like can be used.

<Hard coat>
The hard coat layer is formed for the purpose of increasing the hardness of the film sensor surface. The effect is a weather-resistant treatment that does not cause scratches such as pencils and scratches caused by steel wool. The material for forming the hard coat layer may be any material having transparency, appropriate hardness, and mechanical strength, and examples thereof include resin materials such as acrylic resins, organic silicone resins, and polysiloxanes. In addition, when applying the hard coat layer, it is possible to increase the hardness by mixing a resin filler or an inorganic filler in the coating liquid, or to make the film itself opaque and impart a privacy protection function. You can use it.

<Ultraviolet absorbing layer / infrared absorbing layer>
The film sensor of the present invention can be provided with an ultraviolet absorbing layer and / or an infrared absorbing function.
Specifically, for example, the adhesive layer hard coat layer can be provided with an ultraviolet absorption function and / or an infrared absorption function. Moreover, as a transparent substrate, it is also possible to use a plastic film transparent in the visible region containing the ultraviolet absorber and the infrared absorber as described above as the substrate.
The ultraviolet absorption layer and the infrared absorption layer have a function of reducing the incidence of ultraviolet rays and infrared rays in sunlight into the room. As a method, a film containing ultraviolet rays or an infrared absorber may be formed, or each layer may be formed by mixing with an adhesive layer and an adhesive layer, or a hard coat layer. The formation method is not particularly limited.

  UV absorbers include salicylic acid-based, benzophenone-based, benzotriazole-based, cyanoacrylate-based organic systems, and inorganic fine-particle systems such as iron oxide, zinc oxide, titanium oxide, and indium oxide. Or may be used in combination.

  As the infrared absorber, there are an organic type such as an infrared absorbing dye and an inorganic type such as conductive inorganic fine particles, which can be used according to demands. Examples of the organic type include phthalocyanine type and cyanine type organic dyes. Examples of the inorganic system include tin oxide, indium oxide, zinc oxide, tungsten oxide, chromium oxide, molybdenum oxide, antimony-containing tin oxide, and indium-containing tin oxide fine particles. Among these, a material that does not absorb light in the visible light region is preferable. In general, thermoplastic resins such as acrylic resins, polyester resins, alkyd resins, polyurethane resins, epoxy resins, amino resins, and vinyl resins are generally used as resins for fixing ultraviolet rays or infrared absorbers. In addition, the transparent oxide material used in the transparent conductive layer of the film sensor has an absorption performance due to electrical conductivity in the infrared region and an absorption performance due to the band gap in the ultraviolet region. It is possible to provide both the effects of ultraviolet rays and infrared absorbing layers.

<Other configuration examples>
Further, one or a plurality of transparent films may be bonded to one or both sides of the transparent substrate having the first conductive layer and the second conductive layer via an adhesive layer or an adhesive layer.
By doing in this way, it can be multilayered and an intruder's invasion can be prevented effectively.
As a transparent film, it can use similarly to the said transparent base material. As the pressure-sensitive adhesive or adhesive used for the pressure-sensitive adhesive layer or the adhesive layer, those described above can be used.

<Glass window>
As a target to which the film sensor of the present invention is pasted, a glass structure such as a window glass has been mentioned. A resin plate or the like is also possible. Moreover, in order to prevent malfunction of the bonded film sensor, it is possible to prepare an operation permission signal and restrict the operation. As an example, it is preferable to install a microswitch on a window glass or the like.

  Hereinafter, the present invention will be described in detail by way of examples. Examples are examples of the present invention, and the content of the present invention is not limited to these examples.

<Example 1>
As shown in FIG. 1, as a transparent substrate 12, a first transparent conductive layer 13 and a second transparent conductive layer 14 are made of indium tin on a 100 μm thick polyethylene terephthalate film (hereinafter referred to as PET film). An oxide (hereinafter referred to as ITO) is formed, and the detection circuit 15 for detecting the change in capacitance between the two conductive layers is connected to form a film sensor 11. The sheet resistance value of ITO is 2 kΩ / □. A rectangular wave is transmitted as an alternating current signal from the alternating current signal transmitting section, and the frequency of the rectangular wave is 100 kHz. A comparison between the alternating current signals at points A and B shown in FIG. The AC signal at point B is inverted, and the polarity of the AC signal at point B is inverted, and the respective signals are added together.In the normal state, the bridge circuit is in an equilibrium state, and points A and B have the same waveform. Since the signal is an AC signal, the sum of the AC signal at point A and the point B AC signal whose polarity is inverted always becomes zero, and then when the hand is brought into contact with the first transparent conductive layer 13, a comparison circuit is obtained. A signal was output, indicating that the equilibrium state of the bridge circuit has changed and could function as a film sensor.

<Example 2>
As shown in FIG. 3, indium tin oxide (hereinafter referred to as ITO) is formed as a first transparent conductive layer 33 and a second transparent conductive layer 34 on a PET film having a thickness of 100 μm as a transparent substrate 32. Then, the film sensor 31 is formed by connecting the detection circuit 35 for detecting the change in capacitance between the two conductive layers. The sheet resistance value of ITO was formed to be 2 kΩ / □. The AC signal to be transmitted and the method for comparing the AC signal were performed in the same manner as in Example 1. In the normal state, the bridge circuit is in an equilibrium state, and the point A and the point B are AC signals having the same waveform. Therefore, the point B AC signal and the point B AC signal whose polarity is inverted are always added to zero. It was. Next, when the hand was brought into contact with the first transparent conductive layer 13, a signal was output from the comparison circuit. This indicates that the equilibrium state of the bridge circuit has changed and could function as a film sensor.

<Example 3>
As shown in FIG. 4, indium tin oxide (hereinafter referred to as ITO) is formed as a first transparent conductive layer 43 and a second transparent conductive layer 44 on a PET film having a thickness of 100 μm as a transparent substrate 42. Then, the film sensor 41 was formed by connecting the detection circuit 45 that detects the change in capacitance between the two conductive layers. The sheet resistance value of ITO was 5 kΩ / □. The AC signal to be transmitted and the method for comparing the AC signal were performed in the same manner as in Example 1. In the normal state, the bridge circuit is in an equilibrium state, and the point A and the point B are AC signals having the same waveform. Therefore, the point B AC signal and the point B AC signal whose polarity is inverted are always added to zero. It was. Next, when the hand was brought into contact with the first transparent conductive layer 43, a signal was output from the comparison circuit. This indicates that the equilibrium state of the bridge circuit has changed and could function as a film sensor.

<Example 4>
As shown in FIG. 5, indium tin oxide (hereinafter referred to as ITO) is formed as a first transparent conductive layer 53 and a second transparent conductive layer 54 on a PET film having a thickness of 100 μm as a transparent substrate 52. Then, the film sensor 51 is formed by connecting the detection circuit 55 for detecting the change in capacitance between the two conductive layers. The sheet resistance value of ITO was 5 kΩ / □. The AC signal to be transmitted and the method for comparing the AC signal were performed in the same manner as in Example 1. In the normal state, the bridge circuit is in an equilibrium state, and the point A and the point B are AC signals having the same waveform. Therefore, the point B AC signal and the point B AC signal whose polarity is inverted are always added to zero. It was. Next, when the hand was brought into contact with the first transparent conductive layer 43, a signal was output from the comparison circuit. This indicates that the equilibrium state of the bridge circuit has changed and could function as a film sensor.

<Example 5>
As shown in FIG. 6, indium tin oxide (hereinafter referred to as ITO) is formed as a first transparent conductive layer 63 and a second transparent conductive layer 64 on a PET film having a thickness of 100 μm as a transparent substrate 62. Then, the detection circuit 65 for detecting the change in capacitance between the two conductive layers was connected. The sheet resistance value of ITO was formed to be 2 kΩ / □. Further, an adhesive layer is bonded onto the first transparent conductive layer 63, an ultraviolet curable acrylic resin is applied onto the second transparent conductive layer 64, and cured by irradiation with ultraviolet rays to form a hard coat layer. The sensor 61 was used. Next, the adhesive surface of the film sensor 61 and a glass plate having a thickness of 3 mm were bonded together, and the film sensor 61 was put in the same state as that applied on the window glass. The AC signal to be transmitted and the method for comparing the AC signal were performed in the same manner as in Example 1. In the normal state, the bridge circuit is in a balanced state as in the above embodiment, and always becomes zero when the AC signal at point A and the point B AC signal whose polarity is inverted are added. When the hand was brought into contact with the glass on the first transparent conductive layer side, a signal was output in the comparison circuit. This indicates that the equilibrium state of the bridge circuit has changed, and it has been confirmed that the bridge circuit functions as a film sensor when bonded to glass.

<Example 6>
A film sensor 61 was produced with the same configuration as in Example 5 except that a PET film containing a UV absorber with a thickness of 100 μm was used as the transparent substrate 62. The transmittance at 380 nm in the ultraviolet region of the film sensor was 45% in Example 5, but was 0.5% in this Example, and the ultraviolet absorptivity was improved. The function of the film sensor 61 was confirmed in the same manner as in Example 5.

  From the above results, according to the present invention, the counter electrode of the conductive film serving as the detection electrode is formed on the same surface or the opposite surface, and a film sensor capable of detecting a change in capacitance within one film is obtained. Therefore, in order to install the film sensor with excellent detection safety, it is not necessary to replace the window frame, and it is possible to provide a film sensor that can be installed at low cost without the need for remodeling an already built house. Furthermore, by making the transparent substrate into a laminated structure or a multilayer laminate structure of two or more layers bonded together with a transparent substrate and an adhesive layer, a film sensor having excellent piercing strength and tearing strength can be obtained. It is possible to provide a film sensor with high crime prevention that can cope with “breaking glass” that breaks into a house or building.

It is an example of the layer structure of the film sensor of Claim 1 of this invention. It is an equivalent circuit of an example of the detection circuit used with the film sensor of FIG. It is an example of the layer structure of the film sensor of Claim 2 of this invention. It is an example of the layer structure of the film sensor of Claim 3 of this invention. It is an example of the layer structure of the film sensor of Claim 4 of this invention. It is an example of the layer structure of the film sensor of Claim 6 of this invention. It is an example of the layer structure of the film sensor of Claim 8 of this invention. It is an example of the laminated constitution of the film sensor of Claims 9-11 of this invention.

Explanation of symbols

11, 31, 41, 51, 61, 71, 81 ... film sensors 12, 32, 42, 52, 62, 72, 82 ... transparent base materials 13, 33, 43, 53, 63, 73, 83 ... 1st conductive layer 14, 34, 44, 54, 64, 74, 84 ... 2nd conductive layer 15, 35, 45, 55, 65, 75, 85 ... Detection circuit 66, 76 86 ... Adhesive layer or adhesive layer 67, 77, 87 ... Hard coat layers 22, 23, 24, 25 ... Capacitance 26 ... AC signal transmitter 27 ... Comparison circuit 28 ..Intruder 29: stray capacitance of intruder

Claims (11)

A first conductive layer that is transparent is formed on all or a part of one surface of the transparent substrate, and a second conductive layer is formed on a part of the other surface,
And a detection circuit for detecting a change in electrostatic capacitance between the first conductive layer and the second conductive layer is connected to the first conductive layer and the second conductive layer. .   The film sensor according to claim 1, wherein the second conductive layer is formed in a frame shape along the outer periphery of the film sensor. A transparent first conductive layer is formed on a part of one surface of the transparent substrate, and a transparent second conductive layer is formed on a part of the same surface,
And a detection circuit for detecting a change in electrostatic capacitance between the first conductive layer and the second conductive layer is connected to the first conductive layer and the second conductive layer. .   One of the first conductive layer and the second conductive layer is formed in a frame shape along the outer periphery of the film sensor, and the other conductive layer is formed on the inside thereof. The film sensor according to claim 3.   The film sensor according to any one of claims 1 to 4, wherein one or a plurality of transparent films are formed on one side or both sides of the transparent substrate via an adhesive layer or an adhesive layer.   6. The film sensor according to claim 1, wherein an adhesive layer or an adhesive layer is formed on the outermost layer.   The film sensor according to claim 6, wherein a hard coat layer is formed on a surface opposite to the adhesive layer or adhesive layer forming surface of the transparent substrate on which the adhesive layer or adhesive layer is formed.   The film sensor according to claim 1, wherein the transparent substrate has a multilayer structure.   The film sensor according to claim 1, which has an ultraviolet absorption function and / or an infrared absorption function.   A glass structure to which the film sensor is attached.   A glass structure characterized in that the glass structure is a window glass.

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