Glazing with an electrically conductive coating and a data transmission window, its manufacturing method and its use

Abstract

The invention relates to a glazing 10 comprising a glass pane 1, a conductive coating 2 on a surface of the glass pane 1, and a data transmission window 3 in or adjacent to the conductive coating 2, the data transmission window 3 being at least partially free of coating, the data transmission window 3 comprising a rectangular portion 4 having a short side 5 and a long side 6, and a protrusion 7 from the short side 5 or the long side 6, the protrusion 7 comprising an axial portion 8 having an axis parallel to the long side 6. A method for producing the glazing and the use of the glazing as, for example, a window for a motor vehicle are also claimed. The invention is suitable for radio frequency identification (RFID) transponders operating, for example, in the UHF frequency band.

Description

[Technical field]

[0001] The present invention relates to a glazing with an electrically conductive coating and a data transmission window, to a method for its manufacture and to its uses. [Background technology]

[0002] Glazing with a conductive coating and a data transmission window are known. The conductive coating can be for thermal insulation by infrared reflection or for electrical heating. The data transmission window allows radio frequency (RF) communication, for example, between a transmitter transponder on or in the glazing.

[0003] Radio Frequency Identification (RFID) is a contactless automatic identification technology using RF communication. RFID transponders with antennas and RF chips can be located on or in vehicle windows. RFID transponders can be used for automatic toll collection on highways, traffic management, anti-theft of automobiles, etc.

[0004] US Patent No. 6,275,157 (Mays) discloses a vehicle windshield with an RFID transponder operating at 915 MHz. The windshield has a conductive film for thermal insulation with clear spaces from which conductive material has been selectively removed. The RFID transponder is placed in the open space. US Patent Application Publication No. 2004107641 (Walton) discloses a vehicle window with a metal panel for heating or infrared radiation and an automatic toll collection transponder. The metal panel is formed with an aperture having a number of openings. The spacing and size of the openings vary across the aperture to allow for side lobe control.

[0005] WO2020048677 (Holtstiege) discloses a vehicle window having an RFID transponder operating in the range 800 MHz to 3 GHz and a conductive coating. The RFID transponder is preferably positioned centrally in an uncoated area of ​​the window.

[0006] There remains a need for glazing having a conductive coating and improved antenna performance. Summary of the Invention [Problem to be solved by the invention]

[0007] A first object of the present invention is to provide a glazing with improved RF communication. A second object is to provide a simple method for manufacturing said glazing. A third object is to provide a glazing that improves RF communication when used as a vehicle window. [Means for solving the problem]

[0008] In a first aspect, the invention provides a glazing having the features as claimed in claim 1.

[0009] The present invention provides a glazing for electric heating, solar control, or IR solar heating control comprising a glass sheet, an electrically conductive coating disposed on a surface of the glass sheet, and a data transmission window in or adjacent to the electrically conductive coating, wherein the data transmission window is at least partially free of coating, wherein the data transmission window comprises a rectangular portion having a long side and a short side and a protrusion from the long side or the short side, wherein the protrusion comprises an axial portion having an axis parallel to the long side, wherein the protrusion and the axial portion are free of coating, wherein the rectangular portion comprises a plurality of horizontal uncoated lines having a spacing and a plurality of vertical uncoated lines having the same spacing to form a plurality of coated squares or different spacing to form a plurality of coated rectangles, wherein the spacing is selected to be transmissible at a predetermined frequency through the data transmission window, wherein the spacing is less than or equal to one tenth of a wavelength corresponding to the predetermined frequency multiplied by a shortening factor of the glass sheet 1, and wherein at least a section of the axial portion has a predetermined length greater than or equal to one sixth of the wavelength of the predetermined frequency multiplied by the shortening factor of the glass sheet 1.

[0010] With regard to the prior art, it was not possible for a person skilled in the art to guess that the object of the invention could be achieved using the glazing according to the invention, the method according to the invention and the use according to the invention. Surprisingly, the protrusion with an axial portion parallel to the long side improves the RF communication via the data transmission window of an adjacently arranged RFID transponder.

[0011] The inventors have discovered that a protrusion having an axial portion parallel to the long side limits the current induced around the data transmission window.

[0012] The present invention provides a glazing that meets industry testing requirements for RF communications, such as data transmission windows through vehicle windows.

[0013] The glass panes are preferably soda-lime-silica glass manufactured using the float process. The thickness of the glass is preferably in the range of 2-12 mm. The glass panes may be toughened or annealed glass. The glass panes may be monolithic or laminated to another glass pane with a layer of interlayer material, preferably polyvinyl butyral (PVB), between the panes to bond them together.

[0014] Preferably, the conductive coating is spaced inwardly from the periphery of the glass sheet to prevent water from contacting the conductive coating at the periphery and to avoid corrosion of the conductive coating by water. Preferably, the width of the peripheral area without coating is in the range of 5mm to 25mm, more preferably in the range of 10mm to 20mm.

[0015] Preferably, the axis of the axial portion is parallel to the long side within an angular tolerance of -30 degrees to +30 degrees, more preferably -15 degrees to +15 degrees, and most preferably -5 degrees to +5 degrees.

[0016] Preferably, the glazing comprises a plurality of protrusions.

[0017] Preferably, the protrusion or protrusions are free of a coating.

[0018] Preferably, the protrusion or any plurality of protrusions has a shape selected from rectangular, triangular, arcuate, linear, curved line, straight line, or combinations thereof.

[0019] Preferably, each protrusion of the plurality of protrusions comprises a respective axial portion having an axis parallel to the longer side.

[0020] Preferably the protrusion has two axial portions. Preferably the two protrusions are from a short side. Preferably the protrusion is from a short side adjacent to a corner with a long side.

[0021] Preferably, the axial portion or portions are free of a coating.

[0022] Preferably, the or each of the axial portions is rectilinear or rectangular in shape.

[0023] Preferably, the or each of the axial portions has a width in the range of 10 μm to 5 mm, more preferably 20 μm to 4 mm, most preferably 30 μm to 200 μm.

[0024] Preferably, the conductive coating comprises a layer of a transparent conductive oxide, preferably a doped transparent conductive oxide, more preferably tin oxide doped with fluorine.

[0025] Preferably, the conductive coating comprises two, three, or four layers of silver.

[0026] Preferably, an undercoat layer is located between the conductive coating and the glass sheet, the undercoat layer comprising silicon, more preferably silicon and oxygen, and most preferably silicon, oxygen and carbon.

[0027] Preferably, the conductive coating has a sheet resistance of less than 325 ohms / square, more preferably less than 20 ohms / square, and most preferably less than 7 ohms / square.

[0028] Preferably, the predetermined length is less than or equal to half the wavelength of the predetermined frequency multiplied by the shortening factor of the glass sheet.

[0029] Preferably, the glazing further comprises an RFID transponder comprising a control unit for communicating with an external device, the control unit comprising a memory for storing the identification data.

[0030] Preferably the RFID transponder is applied to the surface of the glazing and is preferably attached to the surface of the glazing by means of a polymeric self-adhesive layer.

[0031] In a second aspect, the present invention provides a method for producing a glazing comprising the steps as claimed in claim 12.

[0032] The invention provides a method for manufacturing a glazing according to the invention, comprising the steps of providing a glass sheet, arranging a conductive coating on a surface of the glass sheet, and configuring a data transmission window in or adjacent to the conductive coating, the data transmission window being at least partially free of coating, the data transmission window comprising a rectangular portion having a long side and a short side and a protrusion from the short side or the long side, an axial portion of the protrusion having an axis parallel to the long side, the protrusion and the axial portion being free of coating, the rectangular portion comprising a plurality of horizontal uncoated lines having a spacing therebetween and a plurality of vertical uncoated lines having the same spacing to form a plurality of coated squares or different spacings to form a plurality of coated rectangles, the spacing being selected to be transmissible at a predetermined frequency through the data transmission window, the spacing being less than or equal to one tenth of a wavelength corresponding to the predetermined frequency multiplied by a shortening factor of the glass sheet, and at least a section of the axial portion having a predetermined length greater than or equal to one sixth of the wavelength of the predetermined frequency multiplied by a shortening factor of the glass sheet.

[0033] Preferably, the method of manufacturing the glazing further comprises the step of pyrolytically depositing a conductive coating. Preferably, the coating is deposited by chemical vapor deposition (CVD). Preferably, the coating is deposited during the manufacture of the glass pane.

[0034] Preferably, the method of manufacturing the glazing further comprises the step of forming a data transmission window by at least partial laser ablation of the conductive coating.

[0035] The uncoated areas may be formed by masking during the coating deposition process, or the conductive coating may be deposited and then partially removed to form the uncoated areas.

[0036] The conductive coating material is removed by any method such as laser removal, mechanical polishing, etc. Preferably, the width of the uncoated line is 10 μm to 5 mm, more preferably 20 μm to 200 μm, and even more preferably 30 μm to 100 μm.

[0037] The data transmission window comprises at least one grid of uncoated lines forming a frequency selective surface (FSS) for a given frequency. A plurality of horizontal uncoated lines having a given spacing and a plurality of vertical uncoated lines having the same spacing form a plurality of coated squares. The spacing is selected to allow transmission at the given frequency through the data transmission window. The spacing is no more than one tenth of the wavelength corresponding to the given frequency multiplied by the shortening factor of the glass sheet. For example, for a given frequency of 3 GHz, a shortening factor of 0.6 requires a spacing of no more than 1 cm, preferably no more than 6 mm.

[0038] Instead of the coated squares, a plurality of uncoated vertical lines with different spacings form a plurality of coated rectangles. For the one spacing and the different spacing, the spacing is equal to or less than one tenth of a wavelength corresponding to the predetermined frequency multiplied by the shortening factor of the glass sheet. Preferably, the spacing is greater than the different spacing.

[0039] Preferably, the lengths of the short and long sides of the data transmission window are similar to the width and length, respectively, of an RFID transponder that is to be placed near the data transmission window.

[0040] In a third aspect, the present invention provides the use of a glazing according to the invention as a heated window in a vehicle for land, sea or air, for example as a windscreen, rear window, side window or roof window in a motor vehicle. The present invention may also be used as a window in a building, in a refrigerator door or as a window in a street installation. The present invention may be used in the UHF band, preferably between 900 MHz and 950 MHz.

[0041] The invention is further disclosed by the non-limiting figures, non-limiting examples and comparative examples. [Brief description of the drawings]

[0042] [Figure 1] FIG. 13 shows an embodiment of the present invention having a protrusion from the long side. [Diagram 2] FIG. 13 shows an embodiment having two protrusions from the long side. [Diagram 3] FIG. 13 shows an embodiment of the present invention having a protrusion from the short side. [Figure 4] FIG. 13 shows an embodiment having protrusions from two short sides. [Diagram 5] FIG. 13 shows an embodiment having two protrusions from the short side. [Figure 6] FIG. 13 shows an embodiment having four protrusions from the short side. [Figure 7] FIG. 13 shows an embodiment having three protrusions and two cuts. [Figure 8] FIG. 13 shows an embodiment having six protrusions and two cuts. [Figure 9] FIG. 8 shows an embodiment similar to that of FIG. 7, but with an angled axial portion. [Figure 10] FIG. 9 illustrates an embodiment similar to that of FIG. 8, but with four angled axial sections. [Figure 11] FIG. 13 illustrates an embodiment having axial portions in the peripheral region. [Figure 12] FIG. 12 shows a similar embodiment to FIG. 11, but with a full width projection. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0043] Figure 1 discloses a glazing 10 according to the invention comprising a glass pane 1. An electrically conductive coating 2 is arranged on a surface of the glass pane 1 and spaced inwards from the periphery of the glass pane 1.

[0044] A data transmission window 3 is in the conductive coating 2. The data transmission window 3 is at least partially free of coating to allow RF communication. For example, the data transmission window 3 can be a rectangular grid of laser ablated lines forming a frequency selective surface.

[0045] The data transmission window 3 comprises a rectangular portion 4 having a short side 5 and a long side 6. The shape of the rectangular portion 4 is similar to the shape of an RFID transponder. Although the long side 6 is shown horizontal, it may be oriented at an angle to the horizontal.

[0046] The data transmission window 3 further comprises a protrusion 7. The protrusion 7 may be of any shape, for example, rectangular, triangular, arcuate, linear, or bent line. The shape of the protrusion 7 in FIG. 1 is a bent line with a portion at an angle of about 45 degrees to the long side 6 up to the bend, and an axial portion 8 having an axis approximately parallel to the long side 6.

[0047] Figure 2, like figure 1, discloses a glazing 10 according to the invention. A first protrusion 7 extends from the long side 6 of the data transmission window 3 to a first bend at an angle of about 45 degrees to the long side 6. The first protrusion 7 has a first axial portion 8 with an axis parallel to the long side 6. A second protrusion 7a extends from the long side 6 to a second bend at an angle of about 45 degrees. The second protrusion 7a has a second axial portion 8a with an axis parallel to the long side 6. The first and second axial portions 8, 8a extend from the first and second bends, respectively. The first and second axial portions 8, 8a extend to the left and right, respectively.

[0048] Figure 3 discloses a glazing 10 according to the invention similar to figure 1, but with a protrusion 7 extending from the short side 5 of the rectangular portion 4 of the data transmission window 3. The protrusion 7 comprises an axial portion 8 having an axis parallel to the long side 6. The shape of the protrusion 7 is rectilinear, so that the entire protrusion 7 is coaxial with the axial portion 8.

[0049] Figure 4, similar to figure 3, discloses a glazing 10 according to the invention. A first protrusion 7 extends from the first short side 5. A first axial portion 8 of the first protrusion 7 has an axis parallel to the long side 6. A second protrusion 7a extends from the second short side 5a. The second protrusion 7a has a second axial portion 8a with an axis parallel to the long side 6. The first and second axial portions 8, 8a extend to the left and right, respectively. The first and second short sides 5, 5a are the left and right sides of the rectangular portion 4, respectively.

[0050] 5 discloses a glazing 10 according to the invention, similar to FIG. 3, comprising a plurality of protrusions 7, 7b on a first short side 5. Each of the plurality of protrusions 7, 7b extends from the first short side 5 such that a first auxiliary protrusion 7b is adjacent to a first protrusion 7. The first auxiliary protrusion 7b has a first auxiliary axial portion 8b having an axis parallel to the long side 6.

[0051] Figure 6 discloses a glazing 10 according to the invention, similar to figure 5, with a second protrusion 7a and a second auxiliary protrusion 7c on the second short side 5a. The second auxiliary protrusion 7c is adjacent to the second protrusion 7a. The second protrusion 7a has a second axial portion 8a with an axis parallel to the long side 6. The second auxiliary protrusion 7c has a second auxiliary axial portion 8c with an axis parallel to the long side 6.

[0052] Figure 7 discloses a glazing 10 according to the invention, which comprises a non-aligned protrusion 9 on the second long side 6a, similar to Figure 5. Unlike the protrusion 7, the non-aligned protrusion 9 does not comprise an axial portion 8 having an axis parallel to the long side 6.

[0053] The shape of the non-aligned protrusion 9 in Figure 7 is triangular. The non-aligned protrusion 9 may have other shapes, such as rectangular or bent lines.

[0054] The glazing 10 of FIG. 7 also comprises two cuts 9', 9'a adjacent to the long side 6. Unlike the protrusions 7, the cuts 9', 9'a are not connected to the rectangular portion 4. The cuts 9', 9'a are uncoated lines of the conductive coating 2. The one or more cuts 9', 9'a guide the flow of current in the conductive coating 2 but do not interrupt the flow of current at the sides 5, 5a, 6, 6a of the rectangular portion 4.

[0055] FIG. 8, like FIG. 7, discloses a glazing 10 according to the invention, which is provided with an auxiliary non-aligned protrusion 9a on the second long side 6a.

[0056] The glazing 10 comprises a second protrusion 7a and a second auxiliary protrusion 7c on the second short side 5a. The second auxiliary protrusion 7c is adjacent to the second protrusion 7a. The second protrusion 7a has a second axial portion 8a having an axis parallel to the long side 6. The second auxiliary protrusion 7c has a second auxiliary axial portion 8c having an axis parallel to the long side 6.

[0057] The shape of the protrusion 7 in Figure 8 is a bend line with a portion at an angle of about 40 degrees to the long side 6 up to the bend and an axial portion 8 having an axis approximately parallel to the long side 6. The shape of the second protrusion 7a in Figure 8 is a bend line with a portion at an angle of about 40 degrees to the long side 6 up to the bend and a second axial portion 8a having an axis approximately parallel to the long side 6.

[0058] FIG. 9 shows a glazing 10 according to the invention, similar to FIG. 7, in which the shape of the protrusion 7 is a bend line and the axial portion 8 has an axis approximately parallel to the long side 6 with an angular tolerance of +30 degrees.

[0059] Figure 10 discloses a glazing 10 according to the invention, similar to Figure 8, in which the shape of the second protrusion 7a is a bend line and the axial portion 8a has an axis approximately parallel to the long side 6 and an angular tolerance of +30 degrees.

[0060] Figure 11 discloses a glazing 10 according to the invention similarly to figure 1, where the shape of the protrusion 7 is rectangular, i.e. a second rectangular portion of the protrusion 7 and an axial portion 8 having an axis parallel to the long side 6. The axial portion 8 is formed in a peripheral uncoated area of ​​the glass sheet, where the conductive coating 2 has been removed. The peripheral uncoated area prevents corrosion.

[0061] The glazing 1 of Fig. 11 also comprises a first busbar 11, a first auxiliary busbar 11a and a second busbar 12 for supplying current to the conductive coating 2. The first auxiliary busbar 11 and the first auxiliary busbar 11a are located to the left and right of the second rectangular portion of the projection 7 and extend parallel to the axial portion 8. The first busbar 11 is connected to an external power supply by a supply conductor 13 and the first auxiliary busbar 11a is connected to an external power supply by an auxiliary supply conductor 13a.

[0062] The supply conductor 13 and the auxiliary supply conductor 13a serve as the left and right ends, respectively, of the axial portion 8. The left portion of the axial portion 8 between the supply conductor 13 and the second rectangular portion of the protrusion 7 has a predetermined length 14. The right portion of the axial portion 8 between the auxiliary supply conductor 13a and the second rectangular portion of the protrusion 7 has a predetermined length 14. The predetermined length 14 is a quarter wavelength of the predetermined frequency multiplied by a shortening factor of the glass sheet 1.

[0063] FIG. 12 discloses a glazing 10 according to the invention similar to FIG. 10, in which the second rectangular portion of the projection 7 is the total width of the rectangular portion 4, i.e. the length of the long side 6. EXAMPLES

[0064] Examples and Comparative Examples Examples and comparative examples of glazing according to the invention will be described with reference to its use as a window in an automobile having a transponder for RF communication, such as an RFID transponder on or in the glazing.

[0065] The comparative example is a glazing comprising a glass sheet and a conductive coating thereon. The conductive coating has a data transmission window comprising a rectangular portion having two short sides and two long sides. A non-aligned protrusion is provided from the short sides or the long sides. An RFID transponder of similar dimensions to the rectangular portion is in or on the glazing.

[0066] The embodiment according to the invention is similar to the comparative example, but further comprises at least one axial portion having an axis parallel to the long side.

[0067] The at least one axial portion of the embodiment limits the current flow around the data transmission window, resulting in improved RF communication compared to the comparative example.

[0068] The example and comparative example also include a bus bar that supplies current to the conductive coating for electrical heating. The resistance of the example is greater than that of the comparative example, so less power is available for electrical heating. Surprisingly, the difference in power does not significantly affect defrosting, but the improvement in RF communication to the RFID transponder is significant.

[0069] The predefined length 14 and spacing of the uncoated lines depend on the dielectric constant of the glass panes. When creating a sample or simulation, the shortening factor is estimated to be 0.7 for tempered glass, 0.6 for laminated glass, or 0.5 for coated glass with uncoated lines. To measure the selected frequencies, the samples should be tested in an anechoic chamber. To create a prototype, the sample measurements for the selected frequencies should be compared to the predefined frequencies. The predefined length 14 and spacing of the uncoated lines should be revised for the prototype according to the revised estimate of the shortening factor based on the sample measurements.

[0070] The effect of the present invention is to make the data transmission window 3 larger than the rectangular portion 4 without affecting the viewing area of ​​the glazing 10, resulting in improved RF communication and less laser ablation, which is less expensive than would be required for closer spacing. The present invention avoids extending the data transmission window 3 perpendicular to the long side 6 of the rectangular portion 4, which would affect the viewing area. An example of a viewing area in a windshield is an area where a vehicle driver requires a forward view free of distracting artifacts, such as slight differences in light transmission due to ablated coatings or diffraction of light off the edges of a coating.

[0071] The cross section of the axial portion 8 having the predetermined length 14 is the length of the axial portion 8 or the length of the portion that does not abut the second rectangular portion of the projection 7. In Figures 11 and 12, the second rectangular portion of the projection 7 abuts the axial portion 8 at the center, and both portions of the axial portion 8 have the predetermined length 14.

[0072] References in the drawings are as follows: [Explanation of symbols]

[0073] 1 Glass plate 2. Conductive Coating 3 Data Transmission Window 4 Rectangular part 5 Short Side 5a Second short side 6 Long side 6a Second long side 7 protrusion 7a Second protrusion 7b Auxiliary protrusion 7c Second auxiliary projection 8 Axial section 8a Second axial portion 8b Auxiliary axial section 8c Second auxiliary axial portion 9. Unaligned protrusions 9a Auxiliary non-aligned protrusion 9´ Unconnected wire 9a´ Auxiliary non-connecting wire 10 Glazing 11 First busbar 11a 1st auxiliary busbar 12 Second busbar 13 Supply conductor 13a Auxiliary supply conductor 14 Predetermined length

Claims

1. A glazing 10 comprising: a glass plate 1; a conductive coating 2 on the surface of the glass plate 1; a data transmission window 3 within or adjacent to the conductive coating 2; wherein the data transmission window 3 is at least partially uncoated; the data transmission window 3 comprising: a rectangular portion 4 having a short side 5 and a long side 6; a protrusion 7 extending from the short side 5 or the long side 6; the protrusion 7 comprising: an axial portion 8 having an axis parallel to the long side 6; wherein the protrusion 7 and the axial portion 8 are uncoated; the rectangular portion 4 comprising a plurality of horizontal uncoated lines having a certain spacing and a plurality of vertical uncoated lines having the same spacing for forming a plurality of coated squares or different spacings for forming a plurality of coated rectangles; the spacing being selected such that transmission at a predetermined frequency is possible through the data transmission window 3; the spacing being not more than one tenth of the wavelength corresponding to a predetermined frequency multiplied by the reduction factor of the glass plate 1; at least a section of the axial portion 8 having a predetermined length of at least one sixth of the wavelength of a predetermined frequency multiplied by the reduction factor of the glass plate 1; the glazing 10.

2. The glazing 10 according to claim 1, comprising a plurality of protrusions 7, 7a, 7b, 7c.

3. The glazing 10 according to claim 1 or 2, wherein the protrusion 7 or any of the plurality of protrusions 7, 7a, 7b, 7c has a shape selected from a rectangle, a triangle, a bow, a line, a curved line, a straight line, or a combination thereof.

4. The glazing 10 according to claim 2, wherein the protrusion 7 or any of the plurality of protrusions 7, 7a, 7b, 7c each comprises a plurality of axial portions 8 having an axis parallel to the long side 6.

5. The glazing 10 according to claim 1 or 2, wherein the axial portion 8 or the plurality of axial portions 8a, 8b, 8c, 8d has a straight shape.

6. The glazing 10 according to claim 1 or 2, wherein the axial portion 8 or the plurality of axial portions 8a, 8b, 8c, 8d has a width in the range of 10 μm to 5 mm, more preferably 20 μm to 4 mm, and most preferably 30 μm to 200 μm.

7. The axial portion 8 or the plurality of axial portions 8a, 8b, 8c, 8d have a length in the range of 10 to 50 mm, more preferably 20 to 40 mm, and most preferably 25 to 35 mm, and the glazing 10 according to claim 1 or 2.

8. The conductive coating 2 comprises a transparent conductive oxide, preferably a doped transparent conductive oxide, more preferably a layer of tin oxide doped with fluorine, and the glazing 10 according to claim 1 or 2.

9. The conductive coating 2 has a sheet resistance of less than 325 ohms / square, more preferably less than 20 ohms / square, and most preferably less than 7 ohms / square, and the glazing 10 according to claim 1 or 2.

10. The glazing 10 according to claim 1 or 2 further comprises an RFID transponder comprising a control unit for communicating with an external device, and the control unit comprises a memory for storing identification data.

11. The predetermined length 14 is less than or equal to half of the wavelength of a predetermined frequency multiplied by the shortening coefficient of the glass plate 1, and the glazing 10 according to claim 1 or 2.

12. A method for manufacturing glazing 10, comprising the step of preparing a glass plate 1, the step of depositing a conductive coating 2 on the surface of the glass plate 1, and the step of forming a data transmission window 3 in or adjacent to the conductive coating 2, wherein the data transmission window is at least partially uncoated, the data transmission window 3 comprises a rectangular portion 4 having a short side 5 and a long side 6, and a protrusion 7 from the short side 5 or the long side 6, the protrusion 7 comprises an axial portion 8 having an axis parallel to the long side 6, the protrusion 7 and the axial portion 8 are uncoated, the rectangular portion 4 comprises a plurality of horizontal uncoated lines having a certain interval and a plurality of vertical uncoated lines having the same interval for forming a plurality of coated squares or different intervals for forming a plurality of coated rectangles, the interval is selected to be transmissible at a predetermined frequency through the data transmission window 3, the interval is less than or equal to one tenth of the wavelength corresponding to a predetermined frequency multiplied by the shortening coefficient of the glass plate 1, At least a section of the axial portion 8 has a predetermined length that is one-sixth or more of the wavelength of a predetermined frequency multiplied by the shrinkage factor of the glass plate 1. A method for manufacturing the glazing 10.

13. The method for manufacturing the glazing 10 according to claim 12, further comprising the step of depositing the conductive coating 2 by thermal decomposition during the manufacture of the glass plate 1.

14. The method for manufacturing the glazing 10 according to claim 12 or claim 13, further comprising the step of forming the data transmission window 3 by laser removing at least a part of the conductive coating 2.

15. Use of the glazing 10 according to claim 1 as a front windshield, rear window, side window or roof window of a motor vehicle, or as a window for a building, a window of a refrigerator door or a street fixture.

Images