Front windshield glass and glass bus bar positioning method
By creating a perforated window on the black edge of the glass and using a positioning film method, the problem of invisible copper foil bonding was solved, enabling accurate alignment of the copper foil and accurate positioning of the busbar, thus improving production efficiency and the reliability and safety of the automotive heating system.
Patent Information
- Application Number
- CN202511514805.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-22
- Publication Date
- 2026-01-09
AI Technical Summary
Traditional windshields with heating wires are not visible during copper foil bonding, making it difficult to detect defects such as skewing and wrinkles in a timely manner. This affects contact resistance and connection reliability, and the reliance on later inspection leads to high rework rates and low production efficiency.
A perforated window for copper foil bonding is created on the black edge of the glass to ensure the copper foil bonding is visible. The busbar is accurately positioned using a positioning film method to avoid skewing and wrinkles. A screen printing plate with a perforated design is used.
It achieves accurate and flat copper foil bonding, reduces defect rate, improves production efficiency and safety, reduces contact resistance and overheating risk, and reduces production costs.
Smart Images
Figure CN121291064A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of automotive glass manufacturing and processing technology, specifically to a method for positioning a windshield and a glass manifold. Background Technology
[0002] Windshields with heating wires have become a common feature in mid-to-high-end vehicles, used for rapid defrosting and defogging in cold weather to ensure driving safety. This function is achieved through conductive heating wires printed on the glass, and the circuit of the heating wires is usually connected to the vehicle's power system via positive and negative copper foils bonded to the black edge (black light-blocking enamel layer) of the glass.
[0003] Currently, traditional windshields with heating wires have a completely covered black glaze layer around the perimeter (often referred to as the "fourth-side black edge"), without any special treatment at the pre-set bonding locations of the positive and negative copper foils. This causes significant problems in the production and quality control process: 1. Not visible: When bonding copper foil, the operator cannot directly observe the alignment of the copper foil with the pre-set bonding area of the glass; 2. Uncontrollable quality: Because the view is obstructed by the black border, defects such as skewing, wrinkles, or air bubbles in the copper foil cannot be immediately detected during the process. These defects can lead to increased contact resistance, weak connections, and long-term use may cause localized overheating, power failure, or even safety hazards. 3. Reliance on later testing: Quality problems often need to be detected in subsequent electrical performance testing processes, resulting in high rework rates, low production efficiency, and increased production costs. Summary of the Invention
[0004] The purpose of this invention is to overcome the problems of existing technologies, such as the invisible bonding positions of the positive and negative electrodes in automotive laminated windshield products, the uncontrollable skewing and wrinkling of copper foil, and the easy scratching of PVB film and inconvenient operation by busbar positioning fixtures. This invention provides a windshield and glass busbar positioning method in which the bonding positions of the positive and negative electrodes of the laminated windshield are visible, facilitating copper foil bonding. At the same time, the busbar positioning operation is convenient and quick during installation, ensuring the consistency of installation dimensions.
[0005] To achieve the above objectives, the present invention provides a laminated windshield, which includes a glass body and a tungsten wire disposed within the interlayer of the glass body. Positive and negative terminals are provided on both sides of the glass body, and the positive and negative terminals are respectively connected to the tungsten wire. A black border is printed on the fourth side of the glass body, wherein a copper foil bonding perforation window is provided on the black border where positive and negative copper foils are bonded.
[0006] Preferably, the positive and negative terminals on both sides of the glass body are symmetrically arranged.
[0007] Preferably, the shape of the cutout window is rectangular, circular, elliptical, or polygonal.
[0008] Preferably, the size of the cutout window is greater than or equal to the area of the corresponding copper foil bonding area.
[0009] Preferably, a predetermined gap is left between the boundary of the cutout window and the edge of the bonded copper foil.
[0010] The second aspect of the present invention provides a method for positioning a busbar in a laminated windshield. The method includes: first, laying tungsten wires on a tungsten wire roller on a PVB film; then, placing the PVB film above a positioning film for the busbar in the windshield; then, bonding the busbar along the positioning line of the positioning film to the PVB film after laying the tungsten wires; finally, bonding the positive and negative terminals to the positioning frame of the positioning film and removing the PVB film for later use on a special transfer vehicle.
[0011] Preferably, when bonding the positive and negative copper foils to the ink cutout positions, visually confirm whether the copper foils are skewed or wrinkled.
[0012] According to the above technical solution, by creating a perforated window at the black edge bonding area, operators can directly visually inspect the alignment of the copper foil with the bonding area. This allows for real-time detection and correction of defects such as skewing and wrinkling of the copper foil, ensuring the accuracy and flatness of the bonding from the source and significantly reducing the defect rate. Real-time quality inspection prevents defective products from entering subsequent stages, reducing rework and scrap rates, thereby improving overall production efficiency and first-pass yield, and saving production costs. Furthermore, only the existing black edge screen printing pattern needs to be modified by adding a perforated design; there is no need to change the existing glass substrate, copper foil material, or bonding process. The modification cost is extremely low and it is easy to implement on existing production lines. Therefore, by ensuring the quality of copper foil bonding, the contact resistance and overheating risk at the connection point are reduced, improving the long-term reliability and safety of the automotive heating system. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the structure of the laminated windshield provided according to the present invention; Figure 2 This is a schematic diagram of the structure of the hollowed-out window on the laminated windshield provided by the present invention. Figure 3 This is a schematic diagram of installing a busbar on a glass body; Figure 4 This is a schematic diagram of the structure of the busbar positioning film provided by the present invention.
[0014] Explanation of reference numerals in the attached figures 1-Glass body, 2-Tungsten wire, 3-Positive electrode connector, 4-Negative electrode connector, 5-Black edge, 6-Hollow window, 7-Busbar. Detailed Implementation
[0015] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0016] In this invention, unless otherwise stated, directional terms such as "above" and "edge" included in the terminology represent only the orientation of the term in its normal use or are common terms understood by those skilled in the art, and should not be regarded as a limitation on the term.
[0017] See Figures 1 to 4 The present invention provides a laminated windshield, which includes a glass body 1 and a tungsten wire 2 disposed in the interlayer of the glass body 1. Both sides of the glass body 1 are provided with a positive electrode connector 3 and a negative electrode connector 4, which are respectively connected to the tungsten wire 2. A black edge 5 is printed on the fourth side of the glass body 1, wherein a copper foil bonding perforated window 6 is opened on the black edge 5 at the place where the positive and negative copper foils are bonded.
[0018] In this embodiment, in order to facilitate the setting of the positive electrode connector 3 and the negative electrode connector 4, preferably, the positive electrode connector 3 and the negative electrode connector 4 on both sides of the glass body 1 are symmetrically arranged.
[0019] The hollowed-out window 6 of the laminated windshield provided by the present invention is rectangular, circular, elliptical, or polygonal in shape. Meanwhile, the size of the hollowed-out window 6 is greater than or equal to the area of the corresponding copper foil bonding area, and a predetermined gap is left between the boundary of the hollowed-out window 6 and the edge of the bonded copper foil.
[0020] Specifically, in one embodiment, a rectangular perforated window 6 is made on the black edge 5 corresponding to the positive and negative copper foil bonding areas, respectively. These perforated windows 6 completely penetrate the black edge glaze layer, directly exposing the transparent glass body surface underneath. During actual assembly, the operator aligns the positive and negative copper foils with the bonding areas and applies them accordingly. At this time, through the perforated windows 6, it is clear whether the copper foil completely covers the bonding area, whether its edges are aligned with the bonding area, and whether there are wrinkles or air bubbles under the copper foil. If any problems are found, adjustments or reapplication can be made immediately.
[0021] In another specific implementation, the cutout window 6 can be circular or elliptical in shape, with an area slightly larger than the copper foil itself, to ensure that all edges of the copper foil can be observed. Simultaneously, a gap of approximately 0.5-1mm is maintained between the edge of the cutout window 6 and the edge of the finally bonded copper foil. Thus, in the finished product, from an external viewpoint, the copper foil is completely encased within the black border and the window, without affecting the overall aesthetics of the vehicle.
[0022] By creating a perforated window at the black edge bonding area, operators can directly visually inspect the alignment of the copper foil with the bonding area. This allows for real-time detection and correction of defects such as skewing and wrinkles, ensuring bonding accuracy and flatness from the source and significantly reducing the defect rate. Real-time quality inspection prevents defective products from entering subsequent stages, reducing rework and scrap rates, thereby improving overall production efficiency and first-pass yield, and saving production costs. Furthermore, only the existing black edge screen printing pattern needs modification to add the perforated design; there is no need to change the existing glass substrate, copper foil material, or bonding process. The modification cost is extremely low and it is easy to implement on existing production lines. Therefore, by ensuring the quality of copper foil bonding, the contact resistance and overheating risk at the connection point are reduced, improving the long-term reliability and safety of the automotive heating system.
[0023] Furthermore, this invention also provides a method for positioning busbars in laminated windshields. This method includes: first, laying tungsten wires on a PVB film using a tungsten wire roller; then, placing the PVB film above the positioning film for the windshield busbar; then, bonding the busbar 7 along the positioning line of the positioning film to the PVB film after the tungsten wires have been laid; finally, bonding the positive and negative terminals to the positioning frame of the positioning film and removing the PVB film for later use on a dedicated transfer vehicle. This method solves the problem of busbar positioning in windshield products, avoiding the problems of misaligned busbars due to lack of film and poor dimensional consistency. It achieves dimensional consistency in the bonding of the busbar and the positive and negative terminals. Simultaneously, the positioning film is easy to handle and highly versatile, greatly improving the positioning efficiency of the laminated windshield busbar.
[0024] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings; however, the present invention is not limited thereto. Within the scope of the inventive concept, various simple modifications can be made to the technical solutions of the present invention, including combinations of various specific technical features in any suitable manner. To avoid unnecessary repetition, the present invention will not describe the various possible combinations separately. However, these simple modifications and combinations should also be considered as the content disclosed in the present invention and are all within the protection scope of the present invention.
Claims
1. A laminated windshield, characterized in that, The laminated windshield includes a glass body (1) and a tungsten wire (2) disposed in the interlayer of the glass body (1). Both sides of the glass body (1) are provided with a positive electrode connector (3) and a negative electrode connector (4). The positive electrode connector (3) and the negative electrode connector (4) are respectively connected to the tungsten wire (2). The fourth side of the glass body (1) is printed with a black edge (5). A copper foil bonding perforated window (6) is opened on the black edge (5) where the positive and negative copper foils are bonded.
2. The laminated windshield according to claim 1, characterized in that, The positive electrode connector (3) and negative electrode connector (4) on both sides of the glass body (1) are symmetrically arranged.
3. The laminated windshield according to claim 1, characterized in that, The hollowed-out window (6) is rectangular, circular, elliptical or polygonal in shape.
4. The laminated windshield according to claim 1, characterized in that, The size of the cutout window (6) is greater than or equal to the area of the corresponding copper foil bonding area.
5. The laminated windshield according to claim 1, characterized in that, A predetermined gap is left between the boundary of the hollow window (6) and the edge of the bonded copper foil.
6. A method for positioning the manifold strip of a laminated windshield, characterized in that, The method includes: first, laying tungsten wires on the PVB film using a tungsten wire roller machine; then, placing the PVB film above the positioning film of the front windshield busbar; then, attaching the busbar (7) along the positioning line of the positioning film to the PVB film after laying the tungsten wires; finally, attaching the positive and negative terminals to the positioning frame of the positioning film and removing the PVB and placing it on a special transfer vehicle for later use.
7. The method for positioning the manifold strip of the laminated windshield according to claim 6, characterized in that, When attaching the positive and negative copper foils to the ink cutout positions, visually check whether the copper foils are skewed or wrinkled.