JP4670418B2 - Anti-fog window system for vehicles - Google Patents

Description

  The present invention relates to an anti-fogging window system for preventing fogging of the surface of a window plate for automobiles or the like.

  A window plate such as a windshield and rear glass of an automobile is used on one of the window plates depending on the ambient temperature / humidity inside and outside the window plate on a rainy day or snowy day. When the surface of the plate is below the dew point, or when a sudden temperature change occurs on the window plate, moisture in the atmosphere adheres as water droplets, condensing on the surface of the window plate, Cloudy. Cloudiness may hinder the driver's view and may hinder driving.

  For this purpose, a device called a defroster is provided to remove fogging by blowing hot or dehumidified air from an air conditioner on the surface of a window plate to remove fogging and vaporizing condensed water droplets. In addition, in order to more effectively remove fogging and frost, an electric windshield having an electric heater attached to the glass has been put into practical use.

  What has been described above is a device that removes fogging generated in a window plate, but on the other hand, a special film that makes the window plate difficult to fog is formed and subjected to antifogging treatment. Has been proposed. Conventionally, the antifogging treatment is performed by applying a surfactant to the surface of a window plate, or applying a hydrophilic substance to the surface or using titanium oxide exhibiting photocatalytic activity to make the surface hydrophilic. Water drops are made by making the water drops into a water film, making the window plate surface hydrophobic, or applying a water repellent or kneading a water repellent material to increase the contact angle with water drops. Known methods include using a water-absorbing resin for the window plate or providing a water-absorbing performance by making an inorganic membrane porous, and removing the water droplets by instantly taking the attached water droplets into the membrane. ing. The antifogging window plate as referred to in the present invention does not cause fogging at all, but makes it difficult to fog, for example, an antifogging window plate subjected to antifogging treatment that delays the occurrence of fogging. That is.

  In any of the methods, the durability of the antifogging effect of the antifogging coating formed on the surface of the window plate often depends on the durability of the coating, and still has sufficient practical durability. It is not done. In particular, in the case of automobile applications, the requirements for the weather resistance, wear resistance, and durability are severe in addition to being colorless and transparent.

  Moreover, in the conventional anti-fogging coating, when water exceeding the processing capacity adheres continuously, saturation occurs, and a uniform water film is generated on the surface. The initial water film is not so distorted that the field of view is distorted, but if water continuously adheres, it will eventually become a non-uniform water film. The image seen through the window plate with this non-uniform water film is greatly distorted compared to the image seen through the window plate that is unfogged and untreated with fogging. And hinders visibility.

  In order to solve these problems, various film materials and configurations that can improve the antifogging effect and durability and delay the time until fogging occurs have been proposed.

  As one of the methods, a water-absorbing composite film in which colloidal silica and organoalkoxysilane are mixed in a surfactant-containing urethane resin has been proposed (see, for example, Patent Document 1).

  As another method, an antifogging film comprising a surfactant and an urethane resin containing an isocyanate group-containing silane compound and silica fine particles and exhibiting an antifogging effect due to hydrophilicity of the film surface and water absorption of the resin matrix has been proposed. (For example, refer to Patent Document 2).

  Patent Document 1 or 2 proposes a method for improving durability and water resistance of an antifogging coating.

JP 2003-73147 A JP 2003-73652 A

  In Patent Document 1, an attempt is made to improve wear resistance and water resistance by the blending ratio of colloidal silica and organoalkoxysilane to be blended in the coating.

  In Patent Document 2, a surfactant is fixed in a water-absorbing matrix by chemical bonding, the surface has both hydrophilic and water-absorbing functions, and a silicone compound is used for this matrix. Attempts to improve strength and durability.

  The antifogging effect and durability of the antifogging coating are improved by the methods of Patent Documents 1 and 2, and the time until fogging occurs on the glass surface is slower than the conventional one.

  However, even when the antifogging coating described in Patent Documents 1 and 2 is used, a non-uniform water film is generated if moisture continuously adheres to the antifogging coating. The image seen through the window plate with a non-uniform water film is greatly distorted, and the conventional drawbacks are not solved.

  That is, when the antifogging coating described in Patent Documents 1 and 2 is used for the windshield of an automobile, the occurrence of fogging can be suppressed and a good view can be provided to the driver. If water continues to adhere beyond the processing capacity, a non-uniform water film is generated on the surface, and conversely, the driver's view is obstructed. The non-uniform water film generated on the surface of the antifogging film at this time is blurred and causes visual distortion, compared with the fog generated on the window plate without the antifogging film. The impact on the person's view is great.

  In view of the above problems, an object of the present invention is to provide a vehicle antifogging window system in which the antifogging coating is saturated and a nonuniform water film is not generated on the surface.

  In order to solve the above-mentioned problem, the invention of claim 1 detects the state of moisture adhering to the window plate attached to the vehicle by the detection means, and the control means is dried according to the output of the detection means. An anti-fogging window system for a vehicle that operates means to vaporize water adhering to the window plate-like body, wherein the window plate-like body has an anti-fogging coating on the vehicle interior side surface, The detection means is a moisture detection sensor that detects the amount of moisture adhering to the anti-fogging film, and the control means is a signal that activates the drying means when the moisture detection sensor detects an amount of moisture that exceeds a threshold value. The vehicular defogging window system is characterized in that the drying means operates in accordance with the signal to vaporize water adhering to the defogging film.

  According to a second aspect of the present invention, the antifogging film is provided on the vehicle interior side surface of the window plate through a sheet-like base material. Provide a system.

  According to a third aspect of the present invention, the moisture detection sensor includes an interface between the window plate and the base material, an interface between the base material and the antifogging coating, or a vehicle interior side surface of the antifogging coating. At least a pair of electrodes provided on each of the electrodes, and at least a pair of conductors connected from each of the pair of electrodes and capacitively coupled to each other. The anti-fogging window system for a vehicle according to claim 2, which is a sensor that detects a change in rate.

  According to a fourth aspect of the present invention, the pair of conductors includes an interface between the window plate and the base material, an interface between the base material and the antifogging coating, or a vehicle interior side surface of the antifogging coating. The defogging window system for vehicles according to claim 3, wherein the defogging window system is formed on the same surface.

  According to the invention of claim 5, one of the pair of conductors is formed on a vehicle interior side surface of the antifogging coating, and the other is an interface between the plate member for windows and the base material or the base. The antifogging for vehicles according to claim 3, wherein the antifogging coating is formed at an interface between a material and the antifogging coating, and the pair of conductors face each other with the antifogging coating interposed therebetween. Window system.

  The invention of claim 6 provides the vehicle antifogging window system according to claim 1, wherein the antifogging film is directly formed on the surface of the window plate.

  According to a seventh aspect of the present invention, the moisture detection sensor includes at least a pair of electrodes provided on an interface between the plate for a window and the antifogging coating or a vehicle interior side surface of the antifogging coating, 2. A sensor comprising at least a pair of conductors connected from each of a pair of electrodes and capacitively coupled to each other, and detecting a change in water content of the antifogging film by a change in relative dielectric constant. 6. A defogging window system for a vehicle according to item 6.

  In the invention of claim 8, the pair of conductors are formed on the same surface of either the interface between the window plate and the antifogging coating or the interior surface of the antifogging coating. The defogging window system for a vehicle according to claim 7 is provided.

  In the invention of claim 9, one of the pair of conductors is formed on a vehicle interior side surface of the antifogging coating, and the other is on an interface between the window plate and the antifogging coating. The vehicular anti-fogging window system according to claim 7, wherein the pair of conductors face each other with the anti-fogging coating interposed therebetween.

  According to a tenth aspect of the present invention, the control means is connected to the electrode and the drying means, and includes an electronic circuit for amplification and signal conversion, and the electronic circuit uses a capacitance value between the conductors. An anti-fogging window system for a vehicle according to any one of claims 3, 4, 5, 7, 8, and 9 comprising an oscillation circuit, an astable / bistable multivibrator, and a switched capacitor circuit.

  The present invention has the following effects.

  The present invention forms an anti-fogging film on a window plate, delays the occurrence of fogging, and monitors the amount of water adhering to the anti-fogging film, whereby the anti-fogging film is treated with moisture. Before saturating beyond the capacity, moisture adhering to the antifogging film can be vaporized by drying means. By not saturating the antifogging film, the window plate is not fogged, and a good visual sense can always be secured.

  That is, when the antifogging film is formed on the window plate, the generated water droplet does not immediately appear on the surface of the window plate. Therefore, it does not become cloudy immediately after moisture adheres like a normal window plate. In addition, a moisture detection sensor for detecting the amount of moisture attached to the antifogging coating is provided, and the amount of water absorbed on the antifogging coating can be monitored by issuing a signal from the moisture detection sensor to the control means. . Furthermore, before the anti-fogging coating is saturated beyond the processing capacity, the control means issues a signal to activate the drying means, and the drying means is activated to vaporize water adhering to the anti-fogging coating, thereby This prevents the formation of a non-uniform water film on the plate-like material.

  Further, as in the invention of claim 2, an antifogging film is formed on a sheet-like substrate, and the substrate is fixed to the window plate by an adhesive or an adhesive, so that the window plate is obtained. An antifogging film can be formed.

  Further, as in the invention of claim 3, at least a pair of electrodes and a pair of conductors connected from each of the pair of electrodes are provided on a surface in contact with the anti-fogging film, and the pair of conductors are capacitively coupled. As a result, the relative dielectric constant between the pair of conductors changes according to the change in the amount of water adhering to the antifogging film, and the electrostatic capacitance of the capacitor formed by the antifogging film, the conductor and the electrode is changed. It can be detected as a change in the capacitance value, and the moisture adhesion amount of the antifogging film can be monitored.

  Further, as in the invention of claim 4, by providing the pair of electrodes on the same surface, the capacitor can be formed by the antifogging film, the conductor and the electrode as described above.

  Further, as in the invention of claim 5, when the pair of electrodes are provided on different surfaces so as to face each other through the antifogging film, the conductor is overlapped when the window plate is viewed from the front. The area occupied by the window plate in front view can be reduced.

  Further, as in the invention of claim 6, the antifogging film can be formed on the window plate by directly forming the antifogging film on the surface of the window plate.

  Further, as in the seventh aspect of the invention, at least a pair of electrodes and a pair of conductors continuous from each of the pair of electrodes are provided on a surface in contact with the anti-fogging coating, and the pair of conductors are capacitively coupled. As a result, the relative dielectric constant between the pair of conductors changes according to the change in the amount of water adhering to the antifogging film, and the electrostatic capacitance of the capacitor formed by the antifogging film, the conductor and the electrode is changed. It can be detected as a change in the capacitance value, and the moisture adhesion amount of the antifogging film can be monitored.

  Further, as in the invention of claim 8, by providing the pair of electrodes on the same surface, the capacitor can be formed by the antifogging film, the conductor and the electrode as described above.

  Further, as in the ninth aspect of the invention, when the pair of electrodes are provided on different surfaces so as to face each other through the antifogging film, the conductor is overlapped when the window plate is viewed from the front. The area occupied by the window plate in front view can be reduced.

  Further, as in the invention of claim 10, since the electronic circuit is composed of an oscillation circuit using a capacitance value of a capacitor formed of a conductor, an astable / bistable multivibrator, and a switched capacitor circuit, the capacitor Can be converted into electrical signals such as frequency and voltage that are easier to handle. Furthermore, since the output of the control means is connected to the control device of the drying means, a voltage can be supplied to the drying means in accordance with the moisture adhesion amount signal output from the control means, and the drying means Can be activated by the amount of moisture adhering to the antifogging coating.

  Hereinafter, the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a schematic view showing an example of a plate member for a window of a defogging window system for a vehicle according to the present invention. A fired body (hereinafter referred to as “black sera”) 2 of dark ceramic paste is formed on the peripheral edge of the window plate 1. The black sera 2 has a purpose of preventing the adhesive from being deteriorated by ultraviolet rays while the window plate 1 is bonded to the vehicle body, and the connection portion between the window plate 1 and the vehicle body from the outside of the passenger compartment. It is formed to improve the appearance so that it cannot be seen. The antifogging coating 4 is formed on the surface of the transparent portion 3 at the center of the window plate 1 on the vehicle interior side. The moisture detection sensor 5 for detecting the amount of moisture adhering to the antifogging coating 4 is provided in the area where the black ceramic 2 of the window plate 1 is formed, and the antifogging coating 4 is also a moisture detection sensor. 5 is extended to the area where 5 is formed. The antifogging coating 4 may be formed on the entire plate 1 for windows, but it is preferably formed only on the transparent portion 3 for the purpose of ensuring visibility. When the moisture detection sensor 5 is provided on the black ceramic 2, it is preferable to extend the antifogging coating 4 to the area where the moisture detection sensor 5 is provided. The antifogging coating 4 is made of a water-absorbing polymer or a hydrophilic polymer.

  FIG. 2 is an enlarged view of a region where the moisture detection sensor 5 is provided. The moisture detection sensor 5 includes a pair of electrodes 6 and 6 'and a pair of conductors 7 and 7'. The electrodes 6 and 6 'are each attached with a lead wire and connected to a control means provided in a vehicle body (not shown). A driving power supply line and an output signal line are connected to the control means. The signal line for output is connected to a control device for drying means (not shown) for vaporizing water adhering to the window plate 1 provided on the vehicle body side.

  The pair of conductors 7 and 7 ′ are connected in a line from the pair of electrodes 6 and 6 ′ at a distance from each other. The antifogging film 4 is formed up to the regions of the conductors 7 and 7 ′ of the moisture detection sensor 5, and the antifogging film 4 functions as a dielectric between the conductors 7 and 7 ′. , 7 'are capacitively coupled to form a capacitor. The moisture detection sensor outputs a capacitance value to the control means.

  The control means connected to the electrodes 6 and 6 ′ of the moisture detection sensor 5 is provided with an electronic circuit. This electronic circuit has a function of amplifying and converting a signal from the moisture detection sensor. The electronic circuit is supplied with power from a battery of the vehicle or the like from a driving power line, and changes in the capacitance value, which is a signal transmitted from the moisture detection sensor, for example, changes in oscillation frequency or DC voltage. It is amplified and converted into a change in the quantity of electricity that is easier to handle, such as a change.

  When moisture begins to adhere to the window plate 1, that is, when moisture begins to adhere to the antifogging coating 4, the relative permittivity of the antifogging coating 4 changes, and the capacitor portion of the moisture detection sensor 5 changes. The capacitance value changes. Further, when moisture continuously adheres to the antifogging coating 4, the antifogging coating 4 approaches the limit of the processing capacity, and the capacitance value further changes. Then, when a preset threshold value of the capacitance value is exceeded, an operation signal is output to the controller of the drying means. The controller for the drying means that has received the operation signal supplies a voltage to the drying means in accordance with the signal, and the drying means operates to vaporize the moisture adhering to the antifogging coating 4.

  The water adhering to the anti-fogging film 4 is evaporated by the drying means, and the relative dielectric constant between the conductors 7 and 7 ′ of the water detection sensor 5 returns to the value when no water is adhering. Upon receiving the signal, the control means sends a signal to stop the drying means. Such an operation is repeated to automatically dry the moisture adhering to the anti-fogging coating 4 and prevent condensation beyond the allowable amount of adhering moisture of the anti-fogging coating 4.

  3 and 4 show cross-sectional views taken along the line AA in FIG. 2. FIG. 3 shows an example in which the antifogging coating 4 is directly formed on the surface of the window plate 1. 4 shows an example in which the antifogging coating 4 is formed on the base material 8 and the base material 8 is adhered to the window plate 1.

  In the case of FIG. 3, a pair of conductors 7 and 7 ′ are provided on the black ceramic 2 at the peripheral edge of the window plate 1 so as to be capacitively coupled with a space therebetween. Then, an antifogging film 4 is formed so as to cover the surface of the transparent portion 3 of the window plate 1 and the conductors 7 and 7 '. By forming in this manner, the dielectric between the capacitively coupled conductors 7 and 7 ′ becomes the antifogging film 4, and the relative dielectric constant is increased by the amount of moisture adhering to the antifogging film 4. As a result, a change in the amount of adhering water can be grasped as a change in capacitance.

  Although not shown, the antifogging film 4 may be formed on the window plate 1 before, and the conductors 7 and 7 ′ may be formed on the antifogging film 4. In order to form a state in which the antifogging coating 4 is laminated by printing, spraying, or dipping, the surface of the window plate 1 and the pair of conductors 7 and 7 'are directly or primed. Then, a material composed of a water-absorbing polymer or a hydrophilic polymer is laminated by printing, spraying or dipping.

  In the case of FIG. 4, first, the antifogging film 4 is formed on the surface of the base material 8, and the base material 8 is placed on the transparent portion of the window plate 1 so that the antifogging film 4 is located on the vehicle interior side. Adhere to 3. At that time, an adhesive may be applied to the sticking surface of the base material 8 to form an adhesive layer on the base material, and the adhesive layer may be attached to the window plate body 1. May be provided to attach the substrate 8. The shape of the base material 8 is a shape that covers the transparent portion 3 and projects to the area of the black ceramic 2 where the moisture detection sensor 5 is provided. Conductors 7 and 7 'are provided on the protruding portion so as to be capacitively coupled with a certain distance therebetween. By forming in this way, the relative dielectric constant between the conductors 7 and 7 ′ is influenced by the antifogging coating 4, and moisture adhering to the antifogging coating 4 is detected as a capacitance value. It becomes possible to do.

  As long as the relative dielectric constant between the conductors 7 and 7 ′ is affected by the antifogging coating 4, the positions where the conductors 7 and 7 ′ are provided are not particularly limited. For example, the antifogging coating 4 may be formed after the conductors 7 and 7 ′ are provided on the surface of the substrate 8. The base material is preferably a thin film plastic made of polyethylene terephthalate or the like from the viewpoint of moldability. The thickness of the base material is preferably 10 to 70 μm considering the workability of pasting, and is preferably 15 to 40 μm from the ability to follow a curved surface. The thickness of the adhesive layer is 5 to 50 μm in terms of adhesive strength. In order to maintain good visibility, the thickness is preferably 15 to 40 μm, and the thickness of the anti-fogging coating 4 is preferably 1 to 100 μm from the viewpoint of anti-fogging performance, and is preferable for maintaining good visibility. Is 5-50 μm.

  An example of another embodiment of the pair of conductors 7, 7 'is shown in FIG. FIG. 5 is the same as FIG. 2 except for the positional relationship between the conductors 7 and 7 ′. The pair of conductors 7 and 7 ′ are provided with a space in the cross-sectional direction of the window plate 1. 6 and 7 show sectional views taken along line BB in FIG. 5. FIG. 6 shows an example in which the antifogging coating 4 is directly formed on the surface of the window plate 1. FIG. 7 shows an example in which the antifogging coating 4 is formed on the base material 8 and the base material 8 is stuck to the window plate 1.

  In the case of FIG. 6, one conductor 7 is provided on the black ceramic 2 at the peripheral edge of the window plate 1. Then, the antifogging coating 4 is formed on the interior side surface of the window plate 1 so as to cover the surface of the transparent portion 3 of the window plate 1 and the one conductor 7. Next, the other conductor 7 ′ is provided through the anti-fogging coating 4 at a position facing the previously formed one conductor 7 and capacitively coupled. By forming in this way, the dielectric between the capacitively coupled conductors 7 and 7 ′ becomes the antifogging film 4, and the dielectric constant changes depending on the amount of moisture adhering to the antifogging film 4. As a result, it can be understood as a change in capacitance.

  In the case of FIG. 7, one conductor 7 is provided on the black ceramic 2 at the peripheral edge of the window plate 1. And the antifogging film 4 is formed in the surface of the base material 8, and the base material 8 is stuck to the transparent part 3 of the plate-shaped object 1 for windows so that the antifogging film 4 may be located in the vehicle interior side. . The shape of the base material 8 is a shape that covers the transparent portion 3 and projects to the area of the black ceramic 2 where the moisture detection sensor 5 is provided. On the protruding portion, the other conductor 7 ′ is provided at a position where the other conductor 7 ′ is opposed to one conductor 7 previously formed through the antifogging coating 4 and is capacitively coupled. By forming in this way, the relative dielectric constant between the pair of conductors 7 and 7 ′ is affected by the antifogging coating 4, and moisture adhering to the antifogging coating 4 is converted into a capacitance value. Can be detected.

  As long as the relative dielectric constant between the pair of conductors 7 and 7 ′ is affected by the antifogging coating 4, the positions where the conductors 7 and 7 ′ are provided are not particularly limited. For example, one conductor 7 may be provided on the surface of the base material 8, and after forming the antifogging film 4, the other conductor 7 ′ may be provided on the surface of the antifogging film 4.

  The window plate 1 of the present invention may be an inorganic glass or an organic glass. In the case of inorganic glass, it may be tempered glass or laminated glass in which an intermediate film made of polyvinyl butyral is sandwiched between two glass plates.

  Further, the antifogging coating 4 may be either water absorbent or hydrophilic. In the case of a water-absorbing antifogging film, a water-absorbing layer made of a water-absorbing polymer is formed. In the case of a hydrophilic antifogging film, a hydrophilic layer made of a hydrophilic polymer is formed.

  The electrodes 6 and 6 ′ and the conductors 7 and 7 ′ are not particularly limited as long as they are conductors such as metals. However, in the case where the window plate 1 has a complex shape, such as silver and glass, From the viewpoint of productivity, it is preferable to screen-print and fire a silver paste containing frit as a main component before forming a window plate.

  The width and interval of the pair of conductors 7 and 7 ′ are not particularly limited as long as they function as a capacitor sufficiently stably and have no problem in the process of forming the electrode 6 and the conductor 7. The width of the conductor 7 is preferably 0.5 to 5 mm in that the resistance value of the conductor itself is lowered and formed by means such as printing. The distance between the conductors 7 is preferably 1 to 10 mm in that the electrostatic capacity is obtained and the conductor 7 is mounted on the peripheral portion of the window plate for a vehicle.

  The lengths of the conductors 7 and 7 ′ are determined in consideration of the area of the portion where the conductors 7 and 7 ′ themselves can be disposed and the processing capacity of the attached antifogging film 4 for the moisture adhering thereto. It is preferable that the length of 'is approximately 50 to 500 mm from the viewpoint of obtaining electrostatic capacity and mounting on the peripheral portion of the vehicle window plate.

  The connection from the end of the electrode to the control means may be made using a lead wire, but the electronic circuit of the control means may be directly connected / disposed on the surface of the window plate.

  In addition, the method of connecting the lead wire or the electronic circuit to the electrode includes soldering, bonding with a conductive adhesive, brazing, welding with ultrasonic, high frequency, laser, or the like, or providing a casing on the window plate, The connection terminal can be inserted into the casing and connected to the electrode by means such as crimping or pressing.

  The configuration of the electronic circuit itself is preferably a circuit configuration that can stably amplify and convert the capacitance value between the electrodes. For example, an electronic circuit consisting of a CR oscillation circuit that oscillates using the capacitance value between electrodes, an astable multivibrator, a bistable multivibrator, and a switched capacitor circuit is sufficient for low cost circuit configuration. This is preferable in terms of obtaining accuracy.

  The drying means is not particularly limited as long as the water droplets attached to the anti-fogging film can be vaporized, but the warm or dehumidified air of the air conditioner is blown onto the surface of the window plate to remove the condensed water drops. A device called a defroster that removes fogging by vaporization can be mentioned. In order to remove fogging and frost more effectively, an electric heater may be attached to the window plate or the antifogging coating itself.

  The moisture detection sensor uses a capacitor formed of a pair of conductors on the anti-fogging film, but other forms may be used as long as the amount of water attached to the anti-fogging film can be detected.

  In the present invention, since the control means controls the operation of the drying means according to the output from the moisture detection sensor, it may be integrated with the control device for the drying means, and the form thereof is not limited.

  Next, specific examples will be described.

  A dark ceramic paste is printed on the surface of a glass plate made of soda lime glass having a size of 100 mm × 100 mm × thickness 2 mm, and a pair of electrodes 6, 6 ′ and a pair of conductors 7, 7 are formed on the upper layer with silver paste as shown in FIG. 'Printed and fired. Further, a resin film having an antifogging coating 4 formed on the surface was stuck on the pair of conductors 7 and 7 '. In FIG. 3, conductors 7 and 7 ′ are formed at the interface between the black ceramic 2 and the substrate 8.

  The pair of electrodes 6 and 6 'was formed by separating two squares each having a side of 7.5 mm by 5.5 mm. The pair of conductors 7 were formed so that the line width was 0.7 mm from each of the pair of electrodes 6, the length of the parallel portion was 270 mm, and the interval was 1.5 mm.

  The resin film has an anti-fogging film composed of a water-absorbing layer formed on the front surface, and a pressure-sensitive adhesive layered on the back surface, and is commercially available as “fogging prevention film No. 5156 for buses (manufactured by Asbel)”. I used something. This resin film was cut out so as to cover the conductor 7 formed on the surface of the glass plate, the adhesive layer was directed to the glass plate, and the resin film was pressed and pasted.

  Also, a lead wire was soldered to the electrode 6 and the other end of this lead wire was connected to an LCR meter, and at the same time, this lead wire was switched so that it could be connected to a CR oscillation circuit.

  The glass plate on which the anti-fogging film was formed as described above was placed so as to cover the constant temperature and humidity chamber set at a constant temperature of 25 ° C., and the relative humidity between the constant temperature and humidity chamber and the atmosphere was stabilized. In this state, the capacitance value between the conductors was measured with an LCR meter.

  As a result, the capacitance value between the electrodes when the relative humidity was 80% RH was 193 pF, but the relative humidity increased to 308 pF at 90% RH, 342 pF at 93% RH, and 373 pF at 96% RH. Accordingly, it was observed that the capacitance value was stably increased.

  Similarly, as a result of switching to the CR oscillation circuit and measuring, the oscillation frequency showed a stable change, and the amount of water adhering to the antifogging film could be detected stably.

  Next, an electrode, a conductor, and an antifogging film were formed on the windshield for an automobile in the same manner as described above, and assembled to an actual sedan vehicle. A lead wire is soldered to the electrode and is connected to an air conditioner via a control means. And the experiment in the case where water | moisture content was given to the evaluation of the condition where fogging generate | occur | produces on the surface of an anti-fogging film when a person boarded the motor vehicle was performed.

  In an experiment on the degree of fogging, five people are seated on a normal sedan type vehicle, the air conditioner is set to only air circulation with the inside air circulation, the inside humidity is raised by the exhalation of personnel, and an antifogging film is formed Comparison between the windshield and a normal windshield that had not been subjected to anti-fogging treatment was performed to evaluate the occurrence of fogging on the glass surface.

  As a result, the surface of the windshield on which the antifogging film was formed did not fog, but the surface of the untreated windshield had fogged. Therefore, it was confirmed that the windshield on which the anti-fogging film was formed had an effect that fogging was less likely to occur compared to the untreated windshield.

  In addition, as an experiment in the case where moisture was applied excessively, humidification by personnel was continued and moisture was further applied. Here, the control means has a capacitance of 250 pF between the electrodes installed on the windshield based on a change in capacitance between the electrodes as in the case of the experiment in the thermostatic chamber. When I passed, I set to switch the air conditioner to defroster. As a result, by continuing to be humidified by personnel, the defroster was operated, the moisture of the antifogging film was vaporized, and no fogging occurred on the surface of the windshield.

  The present invention relates to a vehicle antifogging window system in which an antifogging coating does not saturate and a nonuniform water film is not generated on the surface thereof. It can also be used for a plate-like body.

The front view of the plate-shaped object for windows of embodiment of this invention. The enlarged view of the moisture detection sensor in FIG. Sectional drawing of the moisture detection sensor in FIG. Sectional drawing of the moisture detection sensor which shows another form in FIG. The enlarged view of the moisture detection sensor which shows another form in FIG. Sectional drawing of the moisture detection sensor in FIG. Sectional drawing of the moisture detection sensor which shows another form in FIG.

Explanation of symbols

1: Plate for window 2: Fired body of dark ceramic paste (black ceramic)
3: Transparent part 4: Anti-fogging film 5: Moisture detection sensor 6: Electrode 7: Conductor 8: Base material

Claims (12)

  The state of moisture adhering to the window plate attached to the vehicle is detected by the detection means, and the control means operates the drying means according to the output of the detection means to remove the moisture adhering to the window plate. An anti-fogging window system for a vehicle to be vaporized, wherein the window plate has an anti-fogging coating on a vehicle interior side surface, and the detecting means detects the amount of moisture attached to the anti-fogging coating. And the control means operates to issue a signal for operating the drying means when the moisture detection sensor detects an amount of water exceeding a threshold value, and the drying means operates according to the signal. An anti-fogging window system for a vehicle that vaporizes water adhering to the anti-fogging coating.   The antifogging window system for vehicles according to claim 1, wherein the antifogging coating is provided on a vehicle interior side surface of the window plate through a sheet-like base material.   The moisture detection sensor includes at least a pair of electrodes provided on an interface between the window plate and the base material, an interface between the base material and the antifogging coating, or a vehicle interior side surface of the antifogging coating. And a sensor for detecting a change in the moisture content of the anti-fogging film by a change in relative dielectric constant. The anti-fogging window system for vehicles according to claim 2.   The pair of conductors is on the same surface of any one of an interface between the window plate and the base material, an interface between the base material and the antifogging coating, or a vehicle interior side surface of the antifogging coating. The anti-fogging window system for vehicles according to claim 3 formed.   One of the pair of conductors is formed on a vehicle interior side surface of the antifogging coating, and the other is an interface between the window plate and the base or the base and the antifogging coating. The anti-fogging window system for vehicles according to claim 3, wherein the pair of conductors are opposed to each other with the anti-fogging coating interposed therebetween.   The vehicular antifogging window system according to claim 1, wherein the antifogging coating is directly formed on a surface of the window plate.   The moisture detection sensor includes at least a pair of electrodes provided on an interface between the window plate and the antifogging coating or a vehicle interior side surface of the antifogging coating, and a continuous connection from each of the pair of electrodes. The vehicular antifogging according to claim 6, wherein the vehicular antifogging sensor comprises at least a pair of conductors capacitively coupled to each other and detects a change in water content of the antifogging film by a change in relative dielectric constant. Window system.   The pair of conductors are formed on the same surface of either the interface between the window plate and the antifogging coating or the interior side surface of the antifogging coating. The anti-fogging window system for vehicles according to 7.   One of the pair of conductors is formed on a vehicle interior side surface of the anti-fogging coating, and the other is formed at an interface between the window plate and the anti-fogging coating, The anti-fogging window system for vehicles according to claim 7, wherein the conductors oppose each other through the anti-fogging coating.   The control means is connected to the electrode and the drying means, and includes an electronic circuit for amplification and signal conversion. The electronic circuit is an oscillation circuit using an electrostatic capacitance value between the conductors, an unstable or dual circuit. The antifogging window system for vehicles according to any one of claims 3, 4, 5, 7, 8, and 9, comprising a stable multivibrator and a switched capacitor circuit. The vehicle according to any one of claims 1, 2, 3, 4, 5, 6, 7, 8, 9, and 10, wherein the antifogging film is formed on the entire plate for windows. Anti-fog window system. A fired body of a dark ceramic paste is formed on the peripheral edge of the window plate, and the antifogging film is formed on a transparent portion of the window plate,
The moisture detection sensor is provided in a region where the fired body is formed, and the antifogging coating is extended to a region where the moisture detection sensor is formed. The vehicle antifogging window system according to any one of 5, 6, 7, 8, 9, and 10.

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