KR102503128B1 - Heat generating glass laminate - Google Patents

Abstract

An exothermic glass laminate according to the present invention includes a first glass plate; a heating coating layer coated on the first glass plate, which is provided to generate heat when power is applied; a bus bar having a main bus bar stacked on the heating coating layer and electrically connected to the main bus bar and a sub bus bar stacked on the heating coating layer so as not to overlap with the main bus bar and electrically connected to the bus bar; and a second glass plate laminated to the bus bar, wherein the main bus bar includes a first main bus bar extending along a horizontal direction from one end of the first glass plate based on a vertical direction, and a second glass plate at the other end of the first glass plate. It includes a second main bus bar extending in a horizontal direction, wherein the first main bus bar includes: a first main bus bar body extending in a horizontal direction; first main bus bar wings protruding from both ends of the first main bus bar body toward the second main bus bar; And a first main bus bar protrusion having a shape protruding in a direction from the center of the first main bus bar body toward the second main bus bar with respect to the horizontal direction, based on the vertical direction, the first main bus bar A distance between the bar wing and the second main bus bar is 90% to 100% of a distance between the first main bus bar protrusion and the second main bus bar.

Description

Heating glass laminate {HEAT GENERATING GLASS LAMINATE}

The present invention relates to an exothermic glass laminate.

In winter or on a rainy day, frost occurs on the glass of a vehicle due to a temperature difference between the outside and inside of the vehicle. In order to solve the frost generated on the automobile glass, a heating glass has been proposed. In the conventional heating glass, a heating film is attached to the glass surface or a heating wire is formed directly on the glass surface, and then electricity is applied to both terminals of the heating wire to generate heat from the heating wire, thereby raising the temperature of the glass surface to remove frost. In order to smoothly generate heat, conventional heating glass is manufactured through a process of manufacturing a heating layer by sputtering a transparent conductive material such as indium tin oxide (ITO) or Ag thin film. In addition, as another method of manufacturing the heating layer, a fine pattern that is difficult to recognize with the naked eye is formed on the glass surface using a photolithography method or the like. In particular, in the case of the wiper area, a thin metal wire was connected in parallel to the bus bar applied to the surface, and a voltage was applied to the wire to remove the frost of the wiper area.

However, such a conventional manufacturing method of heating glass has a problem of high cost and low efficiency due to a complicated manufacturing process and excessive waste of materials, which has been an obstacle to the generalization of heating glass. In particular, in the case of using a wire, there are problems in that a thin metal wire in micro units is disconnected, and heat is generated in the shape of the wire, making it difficult to remove frost from a large area within a short time.

Prior Document 1: Korean Patent Publication No. 10-2015-0036256 (Announced on April 1, 2019)

The present invention has been made to solve these problems, and the manufacturing process is simplified and manufacturing cost can be reduced, but the disconnection problem and defrosting time can be reduced while providing a heating glass laminate capable of removing frost over a large area. will be.

A heating glass laminate according to an embodiment of the present invention includes a first glass plate made of glass; a heating coating layer, which is a layer coated on the first glass plate with a material containing a material capable of generating heat when power is applied; A bus bar having a main bus bar as a collecting electrode electrically connected to the heating coating layer and a sub bus bar serving as a collecting electrode electrically connected to the main bus bar by being stacked on the heating coating layer so as not to overlap with the main bus bar; and a second glass plate made of glass and laminated to the bus bar, wherein the main bus bar includes a first main bus bar extending in a horizontal direction from one end of the first glass plate based on a vertical direction; 1 includes a second main bus bar extending in a horizontal direction from the other end of the glass plate, wherein the first main bus bar includes: a first main bus bar body extending in a horizontal direction; first main bus bar wings protruding from both ends of the first main bus bar body toward the second main bus bar; And a first main bus bar protrusion having a shape protruding in a direction from the center of the first main bus bar body toward the second main bus bar with respect to the horizontal direction, based on the vertical direction, the first main bus bar A distance between the bar wing and the second main bus bar is 90% to 100% of a distance between the first main bus bar protrusion and the second main bus bar.

Accordingly, it is possible to simplify the glass manufacturing process and reduce the manufacturing cost by including the exothermic coating layer, and it is possible to defrost a large area in a short time without a problem of disconnection and a long defrost time.

1 is a view showing a heating glass laminate according to an embodiment of the present invention.
2 is a view showing a laminated structure of a heating glass laminate according to an embodiment of the present invention.
FIG. 3 is a view showing a region where temperature is obtained in a heating glass laminate according to an embodiment of the present invention.
4 is a table summarizing how the configuration of the heating glass laminate according to an embodiment of the present invention is different in each section to obtain the temperature.
FIG. 5 is a table listing temperatures obtained according to the conditions of FIG. 4 at each location in FIG. 3 .

Hereinafter, some embodiments of the present invention will be described in detail through exemplary drawings. In adding reference numerals to components of each drawing, it should be noted that the same components have the same numerals as much as possible even if they are displayed on different drawings. In addition, in describing an embodiment of the present invention, if it is determined that a detailed description of a related known configuration or function hinders understanding of the embodiment of the present invention, the detailed description will be omitted.

Also, terms such as first, second, A, B, (a), and (b) may be used to describe components of an embodiment of the present invention. These terms are only used to distinguish the component from other components, and the nature, order, or order of the corresponding component is not limited by the term. When an element is described as being “connected,” “coupled to,” or “connected” to another element, that element may be directly connected or connected to the other element, but there may be another element between the elements. It should be understood that may be "connected", "coupled" or "connected".

1 is a view showing a heating glass laminate 1 according to an embodiment of the present invention.

Referring to the drawings, a heating glass laminate 1 according to an embodiment of the present invention includes a first glass plate 10, a second glass plate 40, bus bars 21, 22, and 23 and a heating coating layer 81 ). The heating glass laminate 1 may include a heating film 30 .

1st glass plate 10 and 2nd glass plate 40

The first glass plate 10 and the second glass plate 40 serve as a base material for the heating glass laminate 1 . The first glass plate 10 and the second glass plate 40 may be flat glass. At this time, as the first glass plate 10 and the second glass plate 40, soda lime glass, float glass, quartz glass, borosilicate glass, etc., which are used for automobiles, may be used. The first glass plate 10 and the second glass plate 40 are plastics, preferably rigid plastics, in particular polyethylene, polypropylene, polycarbonate, polymethyl methacrylate, polystyrene, polyamide, polyester, polyvinyl chloride and/or or mixtures thereof.

As the first glass plate 10 and the second glass plate 40, glass having an appropriate thickness may be used depending on the purpose of use. For example, transparent glass having an average thickness of 0.5 to 10 mm or 1 to 5 mm may be independently used as the first glass plate 10 and the second glass plate 40 .

Specifically, the first glass plate 10 may be an inner glass of a vehicle installed to face the inner environment of the vehicle. The second glass plate 40 may be an outer glass of a vehicle installed to face the external environment of the vehicle. The second glass plate 40 may be laminated on a heating film 30 to be described later. In this specification, being laminated means being fixed in a state of being in contact with one of the side surfaces of the member in the vertical direction, and the direction of being laminated is not limited to one of the vertical directions.

The first glass plate 10 and the second glass plate 40 may have a width in a horizontal direction orthogonal to the vertical direction and a width in a vertical direction orthogonal to the vertical direction and the horizontal direction.

Bus bar (21, 22, 23)

The bus bars 21, 22, and 23 are strip or band-shaped current collecting electrodes, and may be printed and fired conductive structures. The bus bars 21, 22, and 23 may include at least one metal, preferably silver (Ag). The bus bars 21, 22, and 23 may be formed as the metal particles are contained in paste or ink, applied, and then printed. The bus bars 21, 22, and 23 may have a thickness of 5 μm to 40 μm, 8 μm to 20 μm, and preferably 10 μm to 15 μm. Bus bars 21, 22 and 23 of such a thickness can be realized without technical difficulties and can have advantageous current load capacity.

Busbars 21, 22 and 23 may be constructed from strips of electrically conductive foil. These bus bars 21, 22 and 23 are made of aluminum (Al), copper (Cu), tin (Sn) plated copper, gold (Au), silver, zinc (Zn), tungsten (T) and/or tin. or an alloy thereof. The thickness of such a strip may be 10 μm to 300 μm, preferably 30 μm to 100 μm. Bus bars 21, 22 and 23 of such a thickness can be realized without technical difficulties and can have advantageous current load capacity.

The bus bars 21 , 22 , and 23 may include main bus bars 21 and 22 and sub bus bars 23 . The main bus bars 21 and 22 may be laminated on the first glass plate 10 , and the sub bus bars 23 may be laminated on the first glass plate 10 so as not to overlap with the main bus bars 21 and 22 . The bus bars 21, 22, and 23 may be formed by printing a paste containing silver. Conductive tape layers 61 and 62 are formed on the main bus bars 21 and 22 to disperse heat generated from the bus bars 21, 22 and 23 to prevent overheating.

The main bus bars 21 and 22 may include a first main bus bar 21 and a second main bus bar 22 . The first main bus bar 21 may extend along the horizontal direction from one end of the first glass plate 10 based on the vertical direction. The second main bus bar 22 may extend along the horizontal direction from the other end of the first glass plate 10 . Here, one end of the first glass plate 10 may be a portion located on the upper side of FIG. 1 , and the other end may be a portion located on the lower side of FIG. 1 .

The first main bus bar 21 may be connected to the first terminal 51 through the sub bus bar 23 and receive power from an external power source through the first terminal 51 extending to the outside. The second main bus bar 22 may be connected to the second terminal 52 and receive power from an external power source through the second terminal 52 extending outward. The first terminal 51 and the second terminal 52 may be flexible flat cable (FFC) terminals. The first main bus bar 21 and the second main bus bar 22 may extend in a straight line along the horizontal direction, but may have a bent shape along the edges of both ends of the first glass plate 10 based on the vertical direction. may have The third terminal 53 and the fourth terminal 54 may be connected to a heating film 30 to be described later.

The first main bus bar 21 may include a first main bus bar body 211 , a first main bus bar protrusion 213 , and a first main bus bar wing 212 . The first main bus bar protrusion 213 and the first main bus bar wing 212 may be referred to as extensions. The first main bus bar body 211 is a portion extending in the horizontal direction, and the first main bus bar wings 212 extend from both ends of the first main bus bar body 211 toward the second sub bus bar 23. each protruding part. The first main bus bar protrusion 213 is a part protruding from the center of the first main bus bar body 211 toward the second main bus bar 22 in the horizontal direction. Therefore, the first main bus bar 21 has the first main bus bar body 211 as a basic stem, and the first main bus bar protrusion 213 and the first main bus bar wing 212 are the first main bus bar body It may have a shape extending from (211).

Both ends of the first main bus bar protrusion 213 may be connected to the first main bus bar body 211 to form a closed curve together with the first main bus bar body 211 . The first main bus bar protrusion 213 may protrude toward the second main bus bar 22 in a 'U' shape from the first main bus bar body 211 . The first main bus bar protrusion 213 may form a rectangle together with the first main bus bar body 211 .

The distance D1 between the first main bus bar wing 212 and the second main bus bar 22 based on the vertical direction is that the first main bus bar protrusion 213 is the second main bus bar 22 It may be 90% to 100% of the distance D2 spaced apart from. As the first main bus bar protrusion 213 and the first main bus bar wing 212 are arranged as described above, the distance from the second main bus bar 22 is the first main bus bar body 211 Since a portion smaller than the interval between the and the second main bus bar 22 is formed, the amount of heat generated can be increased. The amount of heat generated is proportional to the current, voltage, and time. As the distance D1 becomes shorter, the amount of heat generated increases in inverse proportion to the distance because the current that can flow increases. Similarly, the distance D2 between the first main bus bar protrusion 213 and the second main bus bar 22 is the first main bus bar body 211 and the second main bus bar 22 not shown on the drawing. ) may be shorter than the spaced distance between them, which also has the effect of increasing the calorific value due to the above effect.

The sub bus bar 23 may have a shape protruding in a direction away from the second main bus bar 22 in the center area of the first main bus bar 21 in the horizontal direction. Both ends of the secondary bus bar 23 may be connected to the first main bus bar body 211 to form a closed curve together with the first main bus bar 21 . The part where the sub bus bar 23 is connected to the first main bus bar body 211 is based on the horizontal direction than the part where the first main bus bar protrusion 213 is connected to the first main bus bar body 211. can be located outside.

As the sub bus bar 23 connected to the first terminal 51 is connected to the first main bus bar 21, compared to the case where the first main bus bar 21 is directly connected to the first terminal 51 When this is done, the current delivered to the first main bus bar 21 can be further distributed.

2 is a view showing a laminated structure of a heating glass laminate 1 according to an embodiment of the present invention.

Referring to FIG. 2 , a heating glass laminate 1 according to an embodiment of the present invention may include various layers stacked between a first glass plate 10 and a second glass plate 40 . The heating glass laminate 1 includes a bus bar 20 along the vertical direction, and an in-plane area A1 provided to secure a view through light transmission and a wiper area not including the bus bar 20 ( It can be classified as A2). The first main bus bar 21 and the second main bus bar 22 may be positioned at the boundary of the in-plane area A1 based on the vertical direction.

Exothermic coating layer (81)

The heating glass laminate 1 according to an embodiment of the present invention includes a heating coating layer 81 . The heating coating layer 81 is a layer laminated on the inner surface of the first glass plate 10 and may be a layer coated with a material containing a material capable of generating heat as power is applied. The bus bar 20 may be stacked on the exothermic coating layer 81 . Therefore, the heating coating layer 81 is electrically connected to each of the bus bars 20 to receive power from the bus bars 20 and generate heat.

The exothermic coating layer 81 may have, for example, a dielectric layer suitable for controlling sheet resistance, protecting against corrosion, or reducing reflection. The exothermic coating layer 81 may preferably contain silver as an electrically conductive layer and silicon nitride (SiNx), an inorganic thin film material, as an auxiliary dielectric. The conductive layer may preferably have a thickness of 10 nm to 200 nm. In order to simultaneously improve conductivity with high transparency, the exothermic coating layer 81 may have a plurality of electrically conductive layers separated from each other by at least one dielectric layer. The exothermic coating layer 81 may include, for example, two, three, or four electrically conductive layers. Representative dielectric layers may contain oxides or nitrides, such as silicon nitride, silicon oxide, aluminum nitride, aluminum oxide, zinc oxide or titanium oxide.

As shown, the heating coating layer 81 is disposed on the in-plane area A1 and may also be disposed on the wiper area A2. The heating coating layer 81 may be formed by etching a portion between the in-plane area A1 and the wiper area A2 so that the portion of the in-plane area A1 and the wiper area A2 do not connect to each other. Therefore, heat is generated in a part of the heating coating layer 81 located in the in-plane area A1 electrically connected to the bus bar 20, but heat does not occur in another part of the heating coating layer 81 located in the wiper area A2. may not be Due to the heating coating layer 81, uniform heating may occur throughout the in-plane region A1.

Heating film(30)

The heating film 30 is a component disposed in the wiper area A2 outside the second main bus bar 22 in the longitudinal direction, and is provided to generate heat as power is applied. The heating film 30 is connected to the third terminal 53 and the fourth terminal 54 . Accordingly, power may be transmitted to the heating film 30 to generate heat. Heat is also generated in the wiper area A2 by the heating film 30 .

The heating film 30 may include a base layer 31 and a film coating layer 32 laminated on one surface of the base layer 31 . The film coating layer 32 may be disposed for heat generation.

The substrate layer 31 serves as a substrate for the heating film 30 and maintains its shape. The substrate layer 31 may use a plastic substrate or film commonly used, for example, PET (polyethylene terephthalate), PI (polyimide), PEN (polyethylene naphthalate), PP (polypropylene), PC (polycarbonate). ) etc. may be used as a material for the base layer 31.

The base layer 31 may have an average thickness of 50 μm to 500 μm. When the average thickness of the base layer 31 is less than the above range, a problem in which the shape is not maintained may occur. When the average thickness of the base layer 31 exceeds the above range, the ductility of the base layer 31 is insufficient, so that the surface is wrinkled without being joined in the same form according to the curvature of the glass, or the peripheral portion of the heating film 30 An empty space equal to the thickness step may be generated, causing bubbles.

The film coating layer 32 serves to remove the frost of the glass surface by heating by electric current. The film coating layer 32 for defrosting the glass surface needs to have excellent exothermic properties and high flexibility at the same time. Since automobile glass has a convex shape with horizontal and vertical curvature, it is necessary for the film coating layer 32 to have high flexibility and not be restricted in shape and shape. Since the film coating layer 32 has high flexibility, it may not be wrinkled in the wiper area A2 while following a convex shape. Indium oxide (ITO) heating elements, which are widely used as conventional transparent conductors, show some lack of flexibility due to the nature of the oxide, making it difficult to use as a heating layer. there was.

Therefore, the film coating layer 32 according to an embodiment of the present invention is used by coating the base layer 31 with a material containing metal. Forming such a film coating layer 32 may be a nanowire having a size that cannot be identified with the naked eye, and by evenly applying it to the base layer 31, surface heat generation may occur unlike a general wire.

The nanowire may include a metal having excellent conductivity, and may include, for example, at least one metal selected from the group consisting of silver, gold, platinum, aluminum, and copper. Specifically, the nanowire may include silver (Ag), and more specifically, may be made of silver (Ag).

In addition, the film coating layer 32 may be prepared by microgravure coating, gravure coating, slot die coating, comma coating, ultrasonic spray coating, spray coating, dip coating, or spin coating of a coating layer composition including nanowires.

The resistance of the film coating layer 32 may be 10Ω/□ to 120Ω/□. When the resistance of the film coating layer 32 is less than the above range, film tearing occurs due to overheating, and when it exceeds the above range, the defrosting effect may be insufficient due to deterioration in heat generation performance.

The nanowire may have a length of 5 μm to 35 μm. When the average length of the nanowires in the film coating layer 32 is less than the above range, it is difficult to form a network between the nanowires, and as a result, conductivity is weak or disappears, so the amount of heat generated is low, the effect of removing frost is insufficient, and the strength against scratches is low Problems can arise. In addition, when the average length of the nanowires exceeds the above range, the nanowire-shaped particles are each entangled like a thread to form a uniform conductivity of the coated exothermic coating layer due to difficulties in manufacturing the film coating layer 32 or in the coating process, that is, uniform temperature It is difficult to implement heat generation, there is a problem that local overheating occurs when the film coating layer 32 prepared in this way is applied, and a problem of breakage due to insufficient hardness of the film coating layer 32 may occur. The nanowire may have a thickness of 25 nm to 80 nm. When the average thickness of the nanowires in the film coating layer 32 is less than the above range, when the nanowires are heated for a long time, heating stability may be deteriorated due to wire short circuit. In addition, when the average thickness of the nanowires exceeds the above range, overheating may occur. The solid content of the film coating layer 32 may be 0.3wt% to 1.2wt%.

Film layer (70)

The heating glass laminate 1 according to an embodiment of the present invention may include a film layer 70 laminated inside, and the film layer 70 includes the first film layer 71 and the second film layer ( 72) may be included. In FIG. 2 , a film layer 70 may be disposed between the bus bar 20 and the enamel layer 82 . In the wiper area A2 , the heating film 30 and the third terminal 53 may be disposed between the first film layer 71 and the second film layer 72 . In the in-plane region A1, other layers may not be disposed between the first film layer 71 and the second film layer 72. Accordingly, the two film layers 71 and 72 may contact each other in the in-plane region A1 to form one film layer 70 . The first film layer 71 may be disposed relatively close to the first glass plate 10 , and the second film layer 72 may be disposed relatively close to the second glass plate 40 .

The first film layer 71 and the second film layer 72 may be made of polyvinylbutyral (PVB). The first film layer 71 and the second film layer 72 may include ethylene vinyl acetate (EVA) or polyurethane (PU). The first film layer 71 may have a thickness of 0.7 mm to 0.8 mm, and the second film layer 72 may have a thickness of 0.3 mm to 0.4 mm. The first film layer 71 may have sound insulation and HUD functions.

The second terminal 52 may be disposed between the first film layer 71 and the second main bus bar 22, and the third terminal 53 is connected to the heating film 30 and the second film layer 72. can be placed in between. The first terminal 51 may be disposed between the first main bus bar 21 and the first film layer 71 .

Conductive tape layer (61, 62, 63, 64)

The heating glass laminate 1 according to an embodiment of the present invention may include conductive tape layers 61, 62, 63, and 64. The conductive tape layers 61, 62, 63, and 64 may be made of thin copper films. The conductive tape layers 61, 62, 63, and 64 that are thin copper films may have a thickness of 0.03 mm to 0.07 mm.

The conductive tape layers 61 , 62 , 63 , and 64 function as electrodes to allow current to flow through the heating film 30 or the bus bar 20 when a voltage is applied. The conductive tape layers 61, 62, 63, and 64 conduct current from an external power source delivered through the terminals 51, 52, 53, and 54. That is, the glass laminate according to the present invention does not include a separate contact medium such as a contact strip, a foil conductor, a conductive structure, etc. between the external power source and the conductive tape layers 61, 62, 63, and 64. . Through this, the heating glass laminate 1 according to an embodiment of the present invention has the advantage of simplifying the manufacturing process by not disposing additional electrodes on the heating film 30 or the like. In addition, there is an advantage in that it is possible to remove frost generated in a large area in a short time by preventing the problem of disconnection due to not using a thin metal wire and the problem of taking a long time to remove frost.

Of the conductive tape layers 61 , 62 , 63 , and 64 , the areas of the portions 63 and 64 stacked on the heating film 30 may be smaller than the area of the heating film 30 . Specifically, the portion of the conductive tape layers 63 and 64 may have a smaller width than the heating film 30 in the longitudinal direction. Similarly, the areas of the portions 61 and 62 of the conductive tape layers 61 , 62 , 63 and 64 stacked on the bus bar 20 may be smaller than the area of the bus bar 20 .

The first conductive tape layer 61 may be disposed between the first main bus bar 21 and the first terminal 51 . The second conductive tape layer 62 may be disposed between the second main bus bar 22 and the second terminal 52 . The third conductive tape layer 63 may be disposed between the film coating layer 32 of the heating film 30 and the third terminal 53 . A fourth conductive tape layer 64 may be disposed between the film coating layer 32 and the fourth terminal 54 . The third conductive tape layer 63 and the fourth conductive tape layer 64 may be spaced apart from each other in the longitudinal direction. The first terminal 51 and the second terminal 52 may be connected to opposite polarities, and the third terminal 53 and the fourth terminal 54 may be connected to opposite polarities, respectively.

Enamel layer(82)

An enamel layer 82 may be disposed between the second glass plate 40 and the film layer 70 . The enamel layer 82 may be composed of black enamel. The enamel layer 82 opaquely covers areas other than areas where light must be transmitted, and serves to hide the bus bar 20 and the heating film 30 from being visible from the outside.

The first main bus bar wing 212 and the first main bus bar protrusion 213 overlap the enamel layer 82 along the entire stacking direction, and may not have a portion that deviate from the enamel layer 82. .

FIG. 3 is a view showing a part where temperature is obtained in the heating glass laminate 1 according to an embodiment of the present invention. 4 is a table summarizing how the configuration of the heating glass laminate 1 according to an embodiment of the present invention was obtained by changing the temperature in each section. FIG. 5 is a table listing temperatures obtained according to the conditions of FIG. 4 at each location in FIG. 3 . The distance D2 shown in FIG. 3 is shown as measuring the distance of a position partially spaced from the center of the heating glass laminate 1 to the right, but this is moved for convenience in drawing, and D2 is the heating glass laminate. It may be a distance measured from the center of the sieve 1.

Referring to FIG. 3 , the temperature according to in-plane heating by the heating coating layer 81 at six positions having different positions along the longitudinal and transverse directions on the heating glass laminate 1 according to an embodiment of the present invention. can be measured. In addition, such temperature measurement may be measured under different conditions as shown in FIG. 4 . These measurement results are shown in FIG. 5 . The unit of each data in FIG. 5 is Celsius.

The 'basic type' of divisions 1 to 3 means a case in which only the second main bus bar 22 and the first main bus bar body 211 are included. In the case of Division 1 composed of the basic type, it can be seen that overheating occurs because heat is concentrated in the area adjacent to both ends of the first main bus bar 21. In the case of Category 2 in which the secondary bus bar 23 is further used in Category 1, the standard deviation of the average temperature value for each measurement part decreases, but it can be seen that the deviation is still large. In the case of section 3 in which conductive tape is further used in section 2, it can be seen that the deviation of the area adjacent to the first main bus bar 21 is greatly reduced.

In Category 3, more extensions are used, and in the case of Category 4 and Category 5 where D1 is equal to D2 or 90% of D2, the deviation is further reduced, so the maximum temperature decreases but the average temperature increases, satisfying the conditions that can be used as vehicle glass. can know In the case of category 6, category 7 and category 8, in which the relative length of D1 to D2 is lower than category 5, as the relative length decreases, the deviation increases and the maximum temperature increases, indicating that it is unsuitable for use as vehicle glass. A condition for being judged suitable for use as a vehicle glass is to satisfy a condition in which the temperature measured by heat generation is 70° C. or less 20 minutes after voltage is applied.

In the above, even though all components constituting the embodiment of the present invention have been described as being combined or operated as one, the present invention is not necessarily limited to these embodiments. That is, within the scope of the object of the present invention, all of the components may be selectively combined with one or more to operate. In addition, terms such as "comprise", "comprise" or "having" described above mean that the corresponding component may be present unless otherwise stated, and thus exclude other components. It should be construed as being able to further include other components. All terms, including technical or scientific terms, have the same meaning as commonly understood by a person of ordinary skill in the art to which the present invention belongs, unless defined otherwise. Commonly used terms, such as terms defined in a dictionary, should be interpreted as being consistent with the contextual meaning of the related art, and unless explicitly defined in the present invention, they are not interpreted in an ideal or excessively formal meaning.

The above description is merely an example of the technical idea of the present invention, and various modifications and variations can be made to those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical idea of the present invention, but to explain, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed according to the claims below, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

1: heating glass laminate
10: first glass plate
21: 1st main bus bar
22: 2nd main bus bar
23: sub bus bar
30: heating film
31: base layer
32: film coating layer
40: second glass plate
51: first terminal
52: second terminal
53: third terminal
54: 4th terminal
61: first conductive tape layer
62: second conductive tape layer
63: third conductive tape layer
64: fourth conductive tape layer
70: film layer
71: first film layer
72: second film layer
81: heating coating layer
82: enamel layer
211: first main bus bar body
212: 1st main bus bar wing
213: first main bus bar protrusion

Claims (7)

A first glass plate made of glass;
a heating coating layer, which is a layer coated on the first glass plate with a material containing a material capable of generating heat when power is applied;
A bus bar having a main bus bar as a collecting electrode electrically connected to the heating coating layer and a sub bus bar serving as a collecting electrode electrically connected to the main bus bar by being stacked on the heating coating layer so as not to overlap with the main bus bar; and
A second glass plate made of glass and laminated to the bus bar,
The main bus bar includes a first main bus bar extending in the horizontal direction from one end of the first glass plate based on the vertical direction, and a second main bus bar extending in the horizontal direction from the other end of the first glass plate, ,
The first main bus bar,
A first main bus bar body extending in the transverse direction;
first main bus bar wings protruding from both ends of the first main bus bar body toward the second main bus bar; and
A first main bus bar protrusion having a shape protruding in a direction from the center of the first main bus bar body toward the second main bus bar with respect to the horizontal direction,
The distance between the first main bus bar wing and the second main bus bar in the longitudinal direction is 90% to 100% of the distance between the first main bus bar protrusion and the second main bus bar. glass laminate. According to claim 1,
The sub-bus bar has a shape protruding in a direction away from the second main bus bar in the central region of the first main bus bar with respect to the horizontal direction, the heating glass laminate. According to claim 1,
The secondary bus bar, both ends of which are connected to the first main bus bar to form a closed curve together with the first main bus bar, the heating glass laminate. According to claim 1,
The heating glass laminate, wherein both ends of the first main bus bar protrusion are connected to the first main bus bar body to form a closed curve together with the first main bus bar body. According to claim 1,
Further comprising a heating film disposed between the heating coating layer and the second glass plate, disposed outside the second main bus bar in the longitudinal direction, and connected to an electrode to generate heat as power is applied,
The heating film is laminated on a base layer and one surface of the base layer, and having a film coating layer for heating, the heating glass laminate. According to claim 5,
a first film layer disposed between the main bus bar and the heating film and made of PVB; and
The heating glass laminate further comprising a second film layer disposed between the heating film and the second glass plate and made of PVB. According to claim 5,
The heating glass laminate further comprising a conductive tape layer composed of a copper thin film laminated on the heating film.

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