Low-e film to which electromagnetic wave transmission pattern is applied

Abstract

Various embodiments of the present disclosure relate to a low-E film to which an electromagnetic wave transmission pattern of a specific frequency is applied. The low-E film comprises: an insulating layer made of an insulating material; and a metal coating layer including a metal or metal oxide coated on one surface of the insulating layer. The metal coating layer has a first pattern formed by removing a portion of the metal coating layer, and the first pattern includes a pattern having a plurality of oval surfaces of an identical shape within a rectangular unit cell, and the pattern having the plurality of oval surfaces is arranged with the long axes of the respective oval surfaces at constant angles, and the long axes of the pattern having the oval surfaces or the extension lines of the long axes meet at one intersection point located at the middle point of the unit cell.

Description

Low-E film with electromagnetic wave transmission pattern

[0001] Various embodiments of this post relate to a Low-E film with a pattern applied that can pass electromagnetic waves of a specific frequency.

[0002]

[0003] Low-Emissivity Film is a special coating film applied to architectural glass or automobiles, and can improve heating and cooling efficiency in buildings and automobiles through the thermal insulation effect between the inside and outside caused by the blocking of infrared rays by silver (Ag) or metal oxides thinly coated on the film.

[0004] However, when a low-E film is coated over the entire glass, an incident electromagnetic wave induces a current in the silver or metal oxide layer of the low-E film, causing the incident electromagnetic wave to be reflected. As a result, when a low-E film is coated over the entire glass of a building, car, etc., electromagnetic waves cannot enter the interior, which can cause communication interference.

[0005] To solve this problem, a portion of the low-E film can be cut to create a gap area, and a repeating pattern of unit cells separated by the gap area can be formed. Although the smaller the size of the unit cell, the higher the transmittance of radio waves, the higher the proportion of the gap area in the low-E film, which leads to the problem of deterioration in the heat blocking performance, which is the original function of the low-E film.

[0006] Conventionally, a structure was proposed in which a square patterning structure and a grid mesh structure were combined in a low-E film to allow specific frequencies to pass through; however, the repetition of such grid patterns caused starbursts and similarly degraded the heat blocking performance, which is the original function of the low-E film. In addition, due to the starburst phenomenon and the repetition of grid patterns, there were also problems regarding the aesthetics perceived by the user when light was incident at a specific angle.

[0007] Accordingly, a structure was proposed to pass specific frequencies by applying a sine wave pattern to the low-E film to improve aesthetics and prevent light spreading / blurring effects, but in this case, there was a problem in that the transmission performance varied depending on the direction of the incident electromagnetic waves due to the asymmetry of the pattern in the vertical / horizontal direction.

[0008]

[0009] Accordingly, the various embodiments of this publication aim to provide a low-E film with an electromagnetic wave transmission pattern applied to effectively transmit electromagnetic waves while reducing the area of ​​the gap region in the low-E film.

[0010] The technical tasks intended to be accomplished in this document are not limited to those mentioned above, and other technical tasks not mentioned will be clearly understood by those skilled in the art to which this post belongs from the description below.

[0011]

[0012] According to one embodiment of the present invention, a low-E film comprises an insulating layer composed of an insulating material and a metal coating layer in which a metal or a metal oxide is coated on one surface of the insulating layer, wherein the metal coating layer has a first pattern formed by removing a portion of the metal coating layer, and the first pattern includes a pattern having a plurality of elliptical faces of the same shape within a rectangular unit cell, wherein the pattern having the plurality of elliptical faces is arranged such that the major axes of each elliptical face form a constant angle with each other, and the major axis or the extension of the major axis of each elliptical face can meet at a single intersection point located at the center of the unit cell.

[0013] According to one embodiment of the present invention, the first pattern may be repeatedly arranged in rows and columns on the metal coating layer.

[0014] According to one embodiment of the present invention, the first pattern may include four patterns having a plurality of elliptical faces.

[0015] According to another embodiment of the present invention, the first pattern may include eight patterns having a plurality of elliptical faces.

[0016] According to one embodiment of the present invention, the metal coating layer may further include a circular second pattern centered on the center of the unit cell formed by removing a portion of the metal coating layer, and the metal coating layer inside the second pattern may be characterized as not being removed according to the first pattern.

[0017] According to one embodiment of the present invention, the diameter of the circular pattern may be 1 / 3 of the length of one side of the unit cell.

[0018] According to one embodiment of the present invention, the metal coating layer may further include a third circular pattern centered on the center of the unit cell formed by removing a portion of the metal coating layer, with the length of the major axis of the pattern having the elliptical shape as the radius.

[0019] According to one embodiment of the present invention, the metal coating layer may further include a fourth circular pattern centered on the center of the unit cell formed by removing a portion of the metal coating layer, and having a radius between the radius of the second pattern and the radius of the third pattern.

[0020] According to one embodiment of the present invention, the radius of the fourth pattern may be the average of the radius of the second pattern and the radius of the third pattern.

[0021] According to one embodiment of the present invention, the width of the gap, which is the area where the metal coating layer is removed to form the first pattern in the metal coating layer, may be 3.5 mm or less.

[0022] According to one embodiment of the present invention, the value obtained by dividing the length of the major axis of a pattern having an elliptical face by the length of the minor axis may be 0.7 or more and 2.0 or less.

[0023] According to one embodiment of the present invention, the metal coating layer may further include a fifth pattern of a curve extending from at least some of the plurality of separation points, which are the intersection points of the third pattern and the pattern having a plurality of elliptical faces, formed by removing a portion of the metal coating layer.

[0024] According to one embodiment of the present invention, the fifth pattern extends from separation points corresponding to the four vertices of the unit cell, and the fifth patterns of the four unit cells, where the vertices meet at one point, can be combined to form a fractal structure.

[0025] According to one embodiment of the present invention, a glass may have a low-E film according to one of the embodiments coated on one surface.

[0026]

[0027] According to one embodiment of the present invention, less of the low-E film is removed compared to conventional technology, thereby reducing the loss of the thermal insulation effect, which is the existing role, while enabling the transmission of electromagnetic wave signals in a specific frequency range, so that communication interference does not occur in buildings or automobiles.

[0028] The effects obtainable from this post are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person with ordinary knowledge in the technical field to which this post belongs from the description below.

[0029]

[0030] FIGS. 1a to 1e are plan views illustrating a Low-E film having a pattern having an elliptical surface according to one embodiment.

[0031] FIGS. 2a to 2c are three-dimensional views illustrating glass coated with a low-E film of various embodiments for comparison.

[0032] Figures 3a to 3c are plan views illustrating simulations of current flow according to a low-E film having various patterns for comparison.

[0033] FIG. 4 is a plan view illustrating a pattern of a Roy film with a circular pattern added to the second flower-shaped pattern of FIG. 1b according to an embodiment of the present invention.

[0034] FIG. 5 is a plan view illustrating a low-E film and a pattern on the film with added separation points and a pattern connecting unit cells according to one embodiment of the present invention.

[0035] FIG. 6 is a plan view illustrating a low-E film with an additionally formed fractal structure and a pattern on the film.

[0036] Figures 7a and 7b are graphs comparing the shape change and electromagnetic wave transmission performance according to the long-short axis ratio of a pattern having an elliptical face forming a flower-shaped pattern.

[0037] Figures 8a and 8b show the description of the TE mode and TM mode of electromagnetic waves and the results of a comparative analysis of the transmission performance of the TE mode component of the electromagnetic waves incident on the low-E film.

[0038] FIG. 9 is a graph showing the transmission performance according to the incident angle of the TE mode among electromagnetic waves according to the pattern structure of a Low-E film with a circular pattern added to one embodiment of the present invention and several examples of pattern structures of Low-E films for comparison.

[0039] FIG. 10 is a graph comparing the loss of the TE mode of an incident electromagnetic wave in an embodiment of the present invention and embodiments for comparison according to a change in the size of the gap separating the pattern pieces.

[0040] FIG. 11 is a graph comparing the area of ​​a low-E film including patterns of various embodiments according to changes in gap width.

[0041] Figure 12 is an experimental result comparing the difference in user visibility of glass coated with a low-E film including a straight or curved pattern according to each embodiment.

[0042]

[0043] The advantages and features of this post, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, this post is not limited to the embodiments described below but may be implemented in various different forms; these embodiments are provided merely to ensure that the posting of this post is complete and to fully inform those skilled in the art of the scope of this post, and this post is defined only by the scope of the claims. Throughout the specification, the same reference numerals refer to the same components.

[0044] When one component is referred to as being "connected to" or "coupled to" another component, it includes cases where it is directly connected or coupled to the other component, or cases where another component is interposed. Conversely, when one component is referred to as being "directly connected to" or "directly coupled to" another component, it indicates that no other component is interposed. "And / or" includes each of the mentioned items and all combinations of one or more of them.

[0045] The terms used herein are for describing embodiments and are not intended to limit this post. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. As used herein, "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, actions, and / or elements to the mentioned components, steps, actions, and / or elements.

[0046] Although terms such as "first," "second," etc., are used to describe various components, it goes without saying that these components are not limited by these terms. These terms are used merely to distinguish one component from another.

[0047] Therefore, it is obvious that the first component mentioned below may be the second component within the technical scope of this post. Unless otherwise defined, all terms used in this specification (including technical and scientific terms) may be used in a meaning that is commonly understood by those skilled in the art to which this post belongs. Furthermore, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0048] Hereinafter, embodiments of the present invention are described in detail with reference to the attached drawings so that those skilled in the art can easily implement the present invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein.

[0049]

[0050] FIGS. 1a to 1e are plan views illustrating a Low-E film having a pattern having an elliptical surface according to one embodiment.

[0051] Low-E film (10) can be applied to glass of buildings or windows of automobiles for thermal insulation purposes and may include a metal coating layer in which silver (Ag) or a metal oxide is thinly coated on the insulating layer. When the Low-E film (10) is coated over the entire glass of a building, it may interfere with the transmission of electromagnetic waves and cause communication interference indoors. To solve this problem, the metal coating layer of the Low-E film (10) is removed according to a certain pattern so that electromagnetic waves can pass through the Low-E film (10). In this document, a flower-shaped pattern is proposed to be added to the Low-E film (10) so that electromagnetic waves can be transmitted while reducing the deterioration of the thermal insulation effect, which is the original function of the Low-E film.

[0052] FIG. 1a is a plan view illustrating a Roy film including a first flower-shaped pattern.

[0053] Referring to FIG. 1a, a pattern (30) having multiple elliptical surfaces can be formed on a low-E film (10). The pattern (30) having multiple elliptical surfaces can be formed by removing a portion of the low-E film (10). Each of the pattern (30) having multiple elliptical surfaces can be formed such that a major axis or an extension of the major axis converges at a single intersection point (40). At this time, the major axis of each of the pattern (30) having multiple elliptical surfaces can be arranged to form a certain angle (90 degrees in the case of FIG. 1a) with respect to the major axis of each of the adjacent pattern (30) having multiple elliptical surfaces. A single pattern unit including a structure in which the pattern (30) having multiple elliptical surfaces is arranged in this way can be referred to as a unit cell (20). The unit cell (20) may have a rectangular or square structure, and the length of one side of the unit cell (20) is 1 / 20 of the wavelength (λ0) to be transmitted It can be formed between 1 / 40. The value obtained by dividing the length of the minor axis of a pattern having multiple elliptical faces by the length of the major axis can be defined as the ratio of the major axis (R) of the ellipse. The intersection point (40) can be located at the center of the unit cell (20). In addition, a pattern (30) having four multiple elliptical faces in the shape shown in the drawing can be referred to as a first flower-shaped pattern in which the pattern (30) having four multiple elliptical faces forms a 90-degree angle with each of the adjacent patterns (30) having each of the multiple elliptical faces. As the first flower-shaped pattern is formed, the problem of communication interference caused by electromagnetic wave shielding, which was caused by the conventional low-E film (10) covering the front surface of the glass, can be resolved.

[0054] FIG. 1b is a plan view illustrating a Roy film including a second flower-shaped pattern.

[0055] Referring to FIG. 1b, a pattern (30) having multiple elliptical faces can be formed on a low-E film (10), similar to the first flower-shaped pattern of FIG. 1a. Each of the pattern (30) having multiple elliptical faces can be formed such that a major axis or an extension of the major axis converges at a single intersection point (40). FIG. 1b illustrates a pattern in which the major axis of each of the eight elliptical faces (30) forms a 45-degree angle with the major axis of an adjacent elliptical face pattern (30), which can be referred to as a second flower-shaped pattern. An area containing one second flower-shaped pattern can be referred to as a unit cell (20), and the intersection point (40) can be located at the center of the unit cell (20). Since the second flower-shaped pattern of FIG. 1b is formed by removing more of the low-E film (10) compared to the first flower-shaped pattern of FIG. 1a, it can have a higher electromagnetic wave transmittance.

[0056] The number of patterns (30) having elliptical surfaces included in the flower-shaped pattern provided within the unit cell may be 4 as shown in FIG. 1a, 8 as shown in FIG. 1b, or any other number.

[0057] FIG. 1c is a plan view illustrating the direction of the induced current when an electromagnetic wave is incident on a Roy film containing a second flower-shaped pattern.

[0058] Referring to FIG. 1c, the low-E film (10) including the second flower-shaped pattern has multiple surfaces separated from each other by a pattern (30) having multiple elliptical surfaces. When an electromagnetic wave (50) is incident thereon, a rotating induced current (I) can be formed in each of the surfaces provided in the low-E film (10). Since the rotational direction of the induced current (I) is constant for electromagnetic waves (50) incident from the same direction, the induced current (I) inside the pattern (30) having multiple elliptical surfaces can flow in a direction that cancels each other out at the unit cell center (60) connecting the intersection point (40) and the intersection point of the pattern (30) having multiple elliptical surfaces. Accordingly, an effect can be produced where almost no induced current (I) flows in the unit cell center (60), and thus, the electromagnetic wave reflection and shielding effects can be reduced, thereby effectively resolving communication blocking.

[0059] FIG. 1d is a drawing illustrating a Roy film including a first flower-shaped pattern according to another embodiment.

[0060] Referring to FIG. 1d, unlike the first flower-shaped pattern shown in FIG. 1a, the major axes of each elliptical-shaped pattern (30) meet at the intersection point (40) at the center of the unit cell (20), and a pattern can be formed such that each elliptical-shaped pattern (30) includes the intersection point (40) at the center of the unit cell (20). In this case, the intersection point of the multiple elliptical-shaped patterns (30) increases, and the portion removed as a pattern from the low-E film (10) increases relatively. Accordingly, the electromagnetic wave transmission performance may be improved, but the thermal insulation effect of the low-E film (10) may be degraded. This structure can be applied in the same way even if the number of multiple elliptical-shaped patterns (30) is different.

[0061] FIG. 1e is a drawing illustrating a Roy film including a first flower-shaped pattern according to another embodiment.

[0062] Referring to FIG. 1e, unlike the first flower-shaped pattern shown in FIG. 1a and 1d, the major axes of each elliptical-shaped pattern (30) meet at the intersection point (40) at the center of the unit cell (20), and the pattern (30) having each elliptical-shaped face can be formed so that the intersection point (40) at the center of the unit cell (20) is not included. In this case, the intersection point of the multiple elliptical-shaped patterns (30) is reduced, so the portion removed as a pattern in the low-E film (10) is relatively reduced, and accordingly, the electromagnetic wave transmission performance may be degraded, but the thermal insulation effect of the low-E film (10) may be increased. This structure can be applied in the same way even if the number of multiple elliptical-shaped patterns (30) is different.

[0063] FIGS. 2a to 2c are three-dimensional views illustrating glass coated with a low-E film of various embodiments for comparison.

[0064] FIG. 2a is a three-dimensional view showing glass coated with a low-E film including the second flower-shaped pattern structure shown in FIG. 1b.

[0065] Referring to FIG. 2a, a Low-E film (10) having a second flower-shaped pattern formed thereon can be coated on glass (70). The second flower-shaped pattern may be a portion that appears after the Low-E film (10) is removed. That is, a plurality of Low-E film pieces separated from each other by cutting a square Low-E film (10) along the second flower-shaped pattern may be coated on the glass (70). Accordingly, there may be a gap (80) separating the Low-E film pieces from each other. And this gap (80) may have the same shape as the second flower-shaped pattern. According to one embodiment, if the gap (80) of the second flower-shaped pattern is formed within a square unit cell (20) with a side length of 15 mm as in FIG. 1b or FIG. 2a, 15 mm x 15 mm = 225 mm 2 The area of ​​the area coated with the low-E film (10), excluding the gap (80) area among the unit cell areas, is 210 mm 2 It can be. Here, the width of the gap (80) can be 0.1mm.

[0066] FIG. 2b is a three-dimensional view illustrating an example in which a low-e film is coated on the front surface of a glass according to one embodiment.

[0067] Referring to FIG. 2b, a patternless low-E film (10) capable of transmitting electromagnetic waves may be coated or bonded to glass (70). Since the low-E film (10) is attached to the front surface of the glass, it may be referred to as a front low-E film structure (1200). In the case of the front low-E film structure, the unit cell area (225 mm²) 2 The entire thing can be seen as being coated with a low-E film (10). Although the thermal insulation effect is excellent, there may be problems with communication blocking due to electromagnetic wave reflection and shielding effects caused by the induced current (I).

[0068] FIG. 2c is a three-dimensional view illustrating an example in which a low-E film having a grid pattern is coated on glass according to one embodiment.

[0069] Referring to FIG. 2c, a grid pattern can be formed on the Low-E film (10) to solve the problem of electromagnetic wave reflection and shielding of the front Low-E film structure (1200). The portion of the Low-E film (10) removed to form the grid pattern can be referred to as a gap (80). According to one embodiment, the unit cell (20) can be set as a square structure with a side length of 15 mm. The separated square pieces of Low-E film formed by the grid pattern can be 1.4 mm x 1.4 mm in size. The width of the gap can be 0.1 mm. Therefore, the arrangement spacing between the grid patterns is 1.5 mmd, which is equal to 1.5 mm, which is 1 / 40 of the wavelength (λ0) corresponding to the 5 GHz electromagnetic wave. Accordingly, 225 mm 2 The area of ​​the region coated with the Low-E film (10) in the unit cell glass of size is 196 mm 2 It could be.

[0070] In the case of a patterned low-E film (10), the wider the area of ​​the gap (80) region (the area not coated with the low-E film), the higher the electromagnetic wave transmittance; however, the area coated with the low-E film (10) is reduced accordingly, which causes a problem in that the thermal insulation effect, which is its original role, deteriorates. As will be described later, in the case of a low-E film (10) with a second flower-shaped pattern applied as shown in FIG. 2a, the electromagnetic wave transmittance is higher or similar to that of a structure (1300) with a grid pattern formed, and according to one embodiment as described above, it may be possible to secure an area coated with the low-E film (10) that is about 7% wider. Therefore, it is possible to obtain the effect of transmitting electromagnetic waves while minimizing the deterioration of the thermal insulation effect.

[0071] Figures 3a to 3c are plan views illustrating simulations of current flow according to a low-E film having various patterns for comparison.

[0072] Figure 3a is a diagram showing the simulation results of the induced current generated in the low-E film when electromagnetic waves are incident on the front low-E film structure.

[0073] Referring to Fig. 3a, according to the induced current simulation (1210) of the front low-E film structure, when electromagnetic waves are incident, the induced current flows strongly in one direction, and accordingly, electromagnetic wave reflection occurs, making it very difficult for electromagnetic waves to pass through.

[0074] Figure 3b is a diagram showing the results of an induced current simulation for a low-E film including a grid pattern.

[0075] Referring to FIG. 3b, according to the induced current simulation (1310) of a low-E film including a grid pattern, when electromagnetic waves are incident, the induced current flows in alignment in one direction, but the degree of alignment and the strength of the induced current are weaker compared to the results of the induced current simulation (1210) of a front low-E film structure. As a result, the electromagnetic wave transmittance may be relatively higher compared to the front low-E film structure (1200).

[0076] Figure 3c is a diagram showing the results of an induced current simulation for a Roy film including a second flower-shaped pattern.

[0077] Referring to FIG. 3c, according to the simulation of the induced current (1110) generated in the low-E film including the second flower-shaped pattern, when an electromagnetic wave is incident, the induced current flows in a rotating direction within the low-E film segment divided by the pattern (30) having a plurality of elliptical surfaces, and when the currents are combined in the central region of the second flower-shaped pattern as described in FIG. 1c, they cancel each other out, so the electromagnetic wave transmittance can be relatively higher compared to the low-E film structure including the grid pattern (1300).

[0078] FIG. 4 is a plan view illustrating a pattern of a Roy film with a circular pattern added to the second flower-shaped pattern of FIG. 1b according to an embodiment of the present invention.

[0079] Referring to FIG. 4, in addition to the second flower-shaped pattern of FIG. 1b, a circular pattern (90) may be further included at the center of the unit cell (20). The circular pattern (90) may be formed on the intersection (40) of the second flower-shaped pattern composed of a pattern (30) having multiple elliptical faces, and its diameter may be 1 / 3 of the length of one side of the unit cell (20). Patterns that may be formed inside the circular pattern (90) by the pattern (30) having multiple elliptical faces may not be formed, thereby allowing the piece of the Low-E film (10) to remain circular. This prevents the Low-E area from being reduced and the thermal insulation effect from deteriorating excessively as the intersection points formed by the pattern (30) having multiple elliptical faces at the center of the second flower-shaped pattern become too numerous.

[0080] Referring to FIG. 4, a second flower-shaped pattern formed by a pattern (30) having multiple elliptical faces within a unit cell (20) and a circular pattern (90) formed at the center of the unit cell (20) may additionally include a first circular pattern (100). The first circular pattern (100) may be a circular pattern passing through vertices located on the outer edge of the unit cell (20) among the vertices on the major axis of each of the patterns (30) having multiple elliptical faces. In other words, the first circular pattern (100) may be a circular shape with a radius equal to the length of the major axis of the pattern (30) having elliptical faces or half the length of one side of the unit cell (20) centered at the center of the unit cell (20). Additionally, a second flower-shaped pattern (110) may be further included in addition to a pattern (30) having multiple elliptical faces within the unit cell (20), a circular pattern (90) formed at the center of the unit cell (20), and a first circular pattern (100). The radius of the second circular pattern (110) may be a value between the radius of the circular pattern (90) and the radius of the first circular pattern (100), and according to one embodiment, it may be the average of the radius of the circular pattern (90) and the radius of the first circular pattern (100). According to another embodiment, the diameter of the second circular pattern (110) may be equal to 2 / 3 of the length of one side of the unit cell (20). Accordingly, the circular pattern (90), the first circular pattern (100), and the second circular pattern (110) may have a constant spacing. The first circular pattern (100) and the second circular pattern (110) can be used to obtain a higher electromagnetic wave transmittance by adding more patterns to the low-E film (10), and the low-E film can be divided into more pieces (surfaces) to further reduce the current flowing in one direction and further reduce electromagnetic wave reflection.

[0081] FIG. 5 is a plan view illustrating a low-E film and a pattern on the film with added separation points and a pattern connecting unit cells according to one embodiment of the present invention.

[0082] Referring to FIG. 5, the intersection point of the first circular pattern (100) of the second flower-shaped pattern and the pattern (30) having multiple elliptical faces can be referred to as a separation point (120). Among the separation points (120), the separation point that contacts the side of the unit cell (20) is in direct contact with the separation point of another unit cell (20), whereas the separation point corresponding to the vertex of the unit cell (20) is provided apart from the separation point of another unit cell (20), so that a significantly large piece of Roy film can be formed at the vertex portion of the unit cell (20). Accordingly, an additional curved pattern starting from the separation point (120) can be formed at the vertex portion of the unit cell (20) so that a fractal structure is formed at the portion where four unit cells (20) meet.

[0083] FIG. 6 is a plan view illustrating a low-E film with an additionally formed fractal structure and a pattern on the film.

[0084] Referring to FIG. 6, the unit cell (20) may have all the pattern configurations mentioned in FIG. 1b, FIG. 4, and FIG. 5. At the vertex where four unit cells (20) are combined, additional curved patterns starting from the separation point (120) may come together to form a fractal pattern (130). As the fractal pattern (130) is added, when multiple unit cells (20) are repeatedly placed on the low-E film (10), the area of ​​the low-E film (10) without a pattern between the unit cells (20) can be minimized, thereby reducing the generation of induced current. The fractal pattern (130) may be composed of curves that are concave or convex with respect to the nearest side of one side of the opposing unit cells (20).

[0085] The structure proposed in this document uses only curved patterns on the Roy film (10), which can reduce light scattering / spreading phenomena that occur in straight patterns such as grid patterns, and is excellent in terms of aesthetics even when the pattern is visible to the user.

[0086] When the unit cell (20) of the second flower-shaped pattern is placed on the Roy film (10), it may be arranged in a circular arrangement, radial arrangement, etc., in addition to a square arrangement, and the arrangement structure is not limited to the embodiment of the drawing.

[0087] Figures 7a and 7b are graphs comparing the shape change and electromagnetic wave transmission performance according to the long-short axis ratio of a pattern having an elliptical face forming a flower-shaped pattern.

[0088] Figure 7a is a diagram showing the shape change of a pattern having an elliptical surface according to the ratio of the major and minor axes.

[0089] Referring to FIG. 7a, it can be seen that the ratio of the major axis (R) of the second flower-shaped pattern is 0.7 (300) and the ratio of the major axis (R) of the second flower-shaped pattern is 2.5 (400). As the ratio of the major axis (R) of the pattern increases, the formed pattern can become closer to a straight line shape.

[0090] Figure 7b is a graph comparing the electromagnetic wave transmission performance according to the ratio (R) of the long axis of an elliptical pattern forming a flower-shaped pattern.

[0091] Referring to FIG. 7b, in the graph (1400) comparing transmission performance according to the ratio of the major axis (R) of an elliptical surface having an incident electromagnetic wave frequency (unit: GHz) and a reduced electromagnetic wave rate (unit: dB) on the x-axis, it can be seen that transmission performance improves as the magnitude of R increases in the cases of R = 2.3 (1410), R = 1.1 (1420), R = 0.7 (1430), and R = 0.3 (1440). However, if the R value increases to 2.0 or higher, the pattern becomes closer to a straight line shape, which can worsen visibility and intensify light scattering / spreading phenomena. When the R value is 0.7 or higher, stable transmission performance can be achieved with less than 10dB of signal loss across the entire 1~6GHz band typically used for communication. Accordingly, in a flower-shaped pattern composed of a pattern (30) having multiple elliptical surfaces with R = 0.7 to 2.0, stable transmission performance and problems such as light scattering and deterioration of visibility may not occur.

[0092] Figures 8a and 8b show the description of the TE mode and TM mode of electromagnetic waves and the results of a comparative analysis of the transmission performance of the TE mode component of the electromagnetic waves incident on the low-E film.

[0093] Figure 8a is a stereoscopic view showing the TE mode and TM mode of an electromagnetic wave.

[0094] Referring to FIG. 8a, when an electromagnetic wave (200) propagates toward a medium boundary (220) between two media, an incident plane (210) can be defined that is perpendicular to the medium boundary and contains the electromagnetic wave (200). The electromagnetic wave (200) may have all polarization vibrations of 360 degrees with respect to the direction of propagation. At this time, the vibration component contained in the incident plane (210) and perpendicular to the direction of propagation of the electromagnetic wave (200) can be defined as the TM mode (Transverse Magnetic Mode), and the vibration component perpendicular to both the incident plane (210) and the direction of propagation of the electromagnetic wave (200) can be defined as the TE mode (Transverse Magnetic Mode). When both the TE mode component and the TM mode component of the electromagnetic wave (200) are incident on the Roy film (10), they exhibit similar transmission tendencies; however, since the TE mode component is generally blocked to a greater degree, only the TE mode component is illustrated and analyzed in FIG. 8b.

[0095] Figure 8b is a graph comparing the transmission performance according to the incident angle of the transverse electric (TE) mode among electromagnetic waves according to the pattern structure of the low-E film of various embodiments.

[0096] Referring to FIG. 8b, in a graph (1500) comparing transmission performance according to the angle of incidence of the TE mode according to a pattern structure where the x-axis is the frequency of the incident electromagnetic wave (unit: GHz) and the y-axis is the rate of reduction of the electromagnetic wave (unit: dB), the result graphs for the case where the TE mode electromagnetic wave is incident on the second flower-shaped pattern at an angle of incidence of 0 degrees (1510), the case where the TE mode electromagnetic wave is incident on the grid pattern at an angle of incidence of 0 degrees (1520), the case where the TE mode electromagnetic wave is incident on the second flower-shaped pattern at an angle of incidence of 60 degrees (1530), the case where the TE mode electromagnetic wave is incident on the grid pattern at an angle of incidence of 60 degrees (1540), the case where the TE mode electromagnetic wave is incident on the front low-E film structure at an angle of incidence of 0 degrees (1550), and the case where the TE mode electromagnetic wave is incident on the front low-E film structure at an angle of incidence of 60 degrees (1560) are compared. As can be seen, in all cases, the transmittance may decrease as the angle of incidence increases. When a TE mode electromagnetic wave is incident on the second flower-shaped pattern at an angle of incidence of 0 degrees (1510) and when a TE mode electromagnetic wave is incident on the second flower-shaped pattern at an angle of incidence of 60 degrees (1530), the transmittance performance may be similar or superior to that of when an electromagnetic wave is incident on other pattern structures.

[0097] FIG. 9 is a graph showing the transmission performance according to the incident angle of the TE mode among electromagnetic waves according to the pattern structure of a Low-E film with a circular pattern added to one embodiment of the present invention and several examples of pattern structures of Low-E films for comparison.

[0098] Referring to FIG. 9, in a graph (1600) comparing transmission performance according to the angle of incidence of the TE mode according to a pattern structure in which the x-axis is the frequency of the incident electromagnetic wave (unit: GHz) and the y-axis is the ratio of the reduced electromagnetic wave (unit: dB), when a TE mode electromagnetic wave is incident at an angle of incidence of 0 degrees (1610), when a TE mode electromagnetic wave is incident at an angle of incidence of 60 degrees (1630), when a TE mode electromagnetic wave is incident at an angle of incidence of 0 degrees (1620), when a TE mode electromagnetic wave is incident at an angle of incidence of 60 degrees (1640), when a TE mode electromagnetic wave is incident at an angle of incidence of 0 degrees (1650), when a TE mode electromagnetic wave is incident at an angle of incidence of 60 degrees, when a TE mode electromagnetic wave is incident at an angle of incidence of 0 degrees (1640), when a TE mode electromagnetic wave is incident at an angle of incidence of 0 degrees (1650), and when a TE mode electromagnetic wave is incident at an angle of incidence of 60 degrees In case (1660), it can be seen that a pattern in which a circular pattern (90), a first circular pattern (100), and a second circular pattern (110) are added to a second flower-shaped pattern has a higher electromagnetic wave transmittance compared to other pattern structures in which electromagnetic waves are incident at the same angle. In this case, the area of ​​the Low-E film (10) of the pattern in which a circular pattern (90), a first circular pattern (100), and a second circular pattern (110) are added to the second flower-shaped pattern can be 4% larger than that of the Low-E film (10) having a grid pattern (1300) with the same unit cell (20) size. In addition, a pattern in which a circular pattern (90), a first circular pattern (100), and a second circular pattern (110) are added to a second flower-shaped pattern can have a wideband transmission performance that is higher than that of a low-E film (10) having a grid pattern (1300) with the same unit cell (20) size in the entire frequency band of 6 GHz or less.

[0099] FIG. 10 is a graph comparing the loss of the TE mode of an incident electromagnetic wave in an embodiment of the present invention and embodiments for comparison according to a change in the size of the gap separating the pattern pieces.

[0100] Referring to FIG. 10, in the graph (1700) comparing the TE mode signal loss of the grid pattern and the second flower-shaped pattern according to the change in gap width, where the x-axis is the width of the gap (80) (unit: mm) and the y-axis is the average loss amount (unit: dB) that occurs as the electromagnetic wave passes through, it can be seen that in the case where the TE mode electromagnetic wave is incident on the grid pattern at an angle of incidence of 60 degrees (1710), the case where the TE mode electromagnetic wave is incident on the second flower-shaped pattern at an angle of incidence of 60 degrees (1720), the case where the TE mode electromagnetic wave is incident on the second flower-shaped pattern at an angle of incidence of 0 degrees (1730), and the case where the TE mode electromagnetic wave is incident on the grid pattern at an angle of incidence of 0 degrees (1740), the electromagnetic wave transmittance increases as the thickness of the gap (80) increases in all cases. In the graph (1700) comparing the TE mode signal loss of the grid pattern and the second flower-shaped pattern according to the change in gap thickness, the experiment was conducted at a frequency of 1 to 6 GHz. When the TE mode incident angle of the electromagnetic wave is 0 degrees, there is no significant difference in transmittance between the two patterns. However, when the TE mode incident angle is 60 degrees, the second flower-shaped pattern can have a significantly higher transmittance than the grid pattern (1300), especially when the width of the gap (80) is 0.35 mm or less. The thinner the gap, the less the pattern is visible to the user, thus providing good visibility.

[0101] FIG. 11 is a graph comparing the area of ​​a low-E film including patterns of various embodiments according to changes in gap width.

[0102] Referring to FIG. 11, the x-axis represents the width of the gap (80) (unit: mm), and the y-axis represents the Low-E area after pattern formation relative to the Low-E area before pattern formation (unit: %). In the graph (1800) comparing the Low-E areas of the grid pattern and the second flower-shaped pattern according to the change in gap width shown in FIG. 11, looking at the area (1810) according to the gap width of the second flower-shaped pattern and the area (1820) according to the gap width of the grid pattern, it can be seen that as the width of the gap (80) increases, the Low-E area after pattern formation relative to the Low-E area before pattern formation decreases. However, the Low-E area ratio of the second flower-shaped pattern is higher than the Low-E area ratio of the grid pattern (1300) at all gap (80) widths. According to one embodiment, in the case of a gap (80) with a width of 0.1 mm, the remaining Low-E area ratio of the second flower-shaped pattern is 90%, whereas the remaining Low-E area ratio of the grid pattern (1300) is smaller than this. Accordingly, in the case of the Low-E film (10) on which the grid pattern (1300) is formed, the thermal insulation effect intended for the original purpose may be relatively more degraded.

[0103] Figure 12 is an experimental result comparing the difference in user visibility of glass coated with a low-E film including a straight or curved pattern according to each embodiment.

[0104] Referring to FIG. 12, user visibility test result 1 (2000) can be observed when visible light is shone on glass with a low-E film that includes only a linear pattern, such as a grid pattern (1300), and user visibility test result 2 (3000) can be observed when visible light is shone on glass with a low-E film that includes a curved pattern, such as a flower pattern. In the case of test result 1 (2000), visible light is continuously reflected by the linear metal, creating an area (2100) where light scattering / spreading effects appear in the user's field of vision. On the other hand, in test result 2 (3000), it can be observed that there is almost no area where light scattering / spreading occurs in the user's field of vision. Accordingly, compared to the low-E film (10) structure with only a linear pattern, the low-E film (10) structure with added curved patterns can be effective for increasing user visibility and securing a field of vision.

[0105]

[0106] This publication has been described with reference to embodiments illustrated in the drawings, but this is merely illustrative, and those skilled in the art will understand that various modifications and equivalent alternative embodiments are possible therefrom. Accordingly, the true technical scope of this publication should be determined by the technical concept of the appended claims.

Claims

1. An insulating layer composed of an insulating material; and It includes a metal coating layer in which a metal or metal oxide is coated on one surface of the insulating layer, and The metal coating layer has a first pattern formed as a portion of the metal coating layer is removed, and The first pattern above includes a pattern having multiple elliptical faces of the same shape within a rectangular unit cell, and The above pattern having a plurality of elliptical faces is arranged such that the major axes of each pattern having an elliptical face form a certain angle with each other, and the major axis or the extension of the major axis of each pattern having an elliptical face meets at a single intersection point located at the center of the unit cell. Roy Film.

2. In Paragraph 1, The first pattern is repeatedly arranged in rows and columns on the metal coating layer, Roy Film.

3. In Paragraph 1, The first pattern comprises four patterns having a plurality of elliptical faces, Royfilm pattern.

4. In Paragraph 1, The first pattern comprises eight patterns having a plurality of elliptical faces, Royfilm pattern.

5. In Paragraph 1, The metal coating layer further includes a circular second pattern centered on the center of the unit cell formed as a part of the metal coating layer is removed, and The metal coating layer inside the second pattern is characterized in that it is not removed according to the first pattern. Roy Film.

6. In Paragraph 5, The diameter of the above circular pattern is 1 / 3 of the length of one side of the above unit cell, Roy Film.

7. In Paragraph 5, The metal coating layer further comprises a third circular pattern centered on the center of the unit cell formed by removing a portion of the metal coating layer, with the length of the major axis of the pattern having the elliptical shape as the radius. Roy Film.

8. In Paragraph 7, The metal coating layer further includes a circular fourth pattern centered on the center of the unit cell formed as a portion of the metal coating layer is removed, and having a radius between the radius of the second pattern and the radius of the third pattern. Roy Film.

9. In Paragraph 8, The radius of the fourth pattern is the average of the radius of the second pattern and the radius of the third pattern, Roy Film.

10. In Paragraph 1, The width of the gap, which is the area where the metal coating layer is removed to form the first pattern in the metal coating layer, is 3.5 mm or less, Roy Film.

11. In Paragraph 1, Characterized by the value obtained by dividing the length of the major axis of the pattern having the above-mentioned elliptical surface by the length of the minor axis being 0.7 or more and 2.0 or less, Roy Film.

12. In Paragraph 7, The metal coating layer is formed by removing a portion of the metal coating layer and further comprises a fifth pattern of a curve extending from at least some of a plurality of separation points that are the intersection points of the third pattern and the pattern having a plurality of elliptical faces. Roy Film.

13. In Paragraph 12, The above fifth pattern extends from separation points corresponding to the four vertices of the unit cell, and The above fifth pattern of four unit cells whose vertices meet at one point combines to form a fractal structure, Roy Film.

14. A low-E film according to any one of claims 1 to 13 coated on one surface, glass.

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