Key cover plate capable of improving silver paste screen printing yield
By using a combination of PET film and multi-layer ink layers in the button cover, the conductive silver paste is ensured to screen printing on the flat PET film under the surface, which solves the problem of low silk-print yield of silver paste in traditional technology and improves the competitiveness and yield of the product.
Patent Information
- Application Number
- CN202421303634.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-07
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-06-07
AI Technical Summary
Because the silver paste layer needs to be screen-printed on the lower surface of the ink layer, the traditional button cover plate is limited by the multi-layer structure of the ink layer, resulting in a low yield on the silver paste, which increases the number of defective products and reduces the competitiveness of the product.
The PET film is used as the medium. The upper surface of the PET film is screened with a shading ink layer, light-transmitting ink and black ink, while the conductive silver paste is screened on the lower surface of the PET film and is bonded to the glass substrate through OCA optical glue to ensure the flatness of the silver paste screen printing.
The yield of silver paste silk screen printing is improved, the number of defective products is reduced, the competitiveness of the product is enhanced, and the production steps are further improved through the purchase of PET film and ink layer.
Smart Images
Figure CN222785194U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of a touch key cover plate, and more specifically to a key cover plate capable of improving the yield rate of silver paste screen printing. Background Art
[0002] Traditional key cover plates usually use FPC, glass sensor or key film under the cover plate. This structure leads to high product cost and is not conducive to improving product competitiveness. Therefore, in order to reduce product costs, some manufacturers set a silver paste layer under the cover plate to realize touch keys. However, since the lower surface of the cover plate also needs to be provided with an ink layer, the silver paste layer can only be screen-printed on the lower surface of the ink layer. Since the ink layer is generally provided with multiple layers, the lower surface of the ink layer is uneven, which in turn reduces the screen printing yield of the silver paste, increases the number of defective products, and reduces the competitiveness of the product. Utility Model Content
[0003] The technical problem to be solved by the utility model is how to improve the silver paste screen printing yield of the key cover plate to reduce the number of defective products and improve the competitiveness of the product.
[0004] The technical problem to be solved by the utility model is achieved through the following technical solutions:
[0005] In order to solve the above technical problems, the utility model provides a key cover plate for improving the yield rate of silver paste screen printing, which includes a glass substrate, a PET film, a conductive silver paste, an insulating oil, a carbon paste, a double-sided adhesive and a diffusion film, the upper surface of the PET film is screen-printed with a light-shielding ink layer, a space-avoiding portion is provided on the light-shielding ink layer, and a light-transmitting ink is screen-printed at the space-avoiding portion, and black ink is screen-printed on the upper surface of the light-shielding ink layer, and the PET film is bonded to the lower surface of the glass substrate through OCA optical glue; the conductive silver paste is screen-printed on the lower surface of the PET film; the insulating oil is arranged on the lower surface of the conductive silver paste, and the insulating oil avoids the space-avoiding portion; the carbon paste is arranged on the lower surface of the conductive silver paste and is conductive with the conductive silver paste, and the carbon paste is located at the avoidance of the insulating oil; the double-sided adhesive is attached to the lower surface of the insulating oil, and the double-sided adhesive avoids the carbon paste and the space-avoiding portion; the diffusion film is attached to the lower surface of the double-sided adhesive, and the diffusion film avoids the carbon paste.
[0006] As a preferred implementation of the key cover plate for improving the silver paste screen printing yield provided by the utility model, the insulating oil is colorless and transparent insulating oil.
[0007] As a preferred implementation of the key cover plate for improving the silver paste screen printing yield provided by the utility model, the color of the glass substrate is transparent.
[0008] As a preferred implementation of the key cover plate for improving the silver paste screen printing yield provided by the utility model, the glass substrate is tempered glass.
[0009] As a preferred embodiment of the key cover plate for improving the silver paste screen printing yield provided by the utility model, the conductive silver paste includes a key touch function pattern located below the key avoidance portion and a GND trace surrounding the key touch function pattern.
[0010] As a preferred implementation of the key cover plate for improving the silver paste silk screen printing yield provided by the utility model, the key touch function pattern avoids the space avoidance portion.
[0011] As a preferred embodiment of the key cover plate for improving the silver paste screen printing yield provided by the utility model, a frame-shaped overflow glue groove is etched on the lower surface of the glass substrate located in the non-visible area, and the OCA optical glue is arranged in the area formed by the overflow glue groove.
[0012] As a preferred implementation of the key cover plate for improving the silver paste screen printing yield provided by the utility model, the cross-sectional shape of the glue overflow groove is V-shaped or semicircular.
[0013] As a preferred implementation of the key cover plate for improving the silver paste screen printing yield provided by the utility model, the thickness of the glass substrate is 0.8 mm.
[0014] As a preferred implementation of the key cover plate for improving the silver paste screen printing yield provided by the utility model, the depth of the glue overflow groove is 0.05 mm.
[0015] The utility model has the following beneficial effects:
[0016] Since the light-shielding ink layer, light-transmitting ink and black ink are all screen-printed on the upper surface of the PET film, and the conductive silver paste is screen-printed on the lower surface of the PET film, the lower surface of the PET film is relatively flat, which can improve the screen printing yield of the silver paste, reduce the number of defective products, and improve the competitiveness of the product; and the light-shielding ink layer, light-transmitting ink and black ink on the PET film and its upper surface can be directly purchased from outside, thereby splitting the production steps and further improving the product yield. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the scheme in the present application, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1A schematic diagram of the stacking structure of a key cover plate for improving the silver paste screen printing yield provided by the utility model.
[0019] Figure 2 for Figure 1 Magnified view of point A in .
[0020] Figure 3 for Figure 1 Exploded view of the upper part of the .
[0021] Figure 4 for Figure 1 Exploded view of the lower half of the .
[0022] Figure 5 This is a schematic diagram of the structure of Example 2.
[0023] Description of Figure Numbers:
[0024] Glass substrate 1; PET film 2; conductive silver paste 3; insulating oil 4; carbon paste 5; double-sided adhesive 6; diffusion film 7; light-shielding black ink layer 21; air-avoiding portion 22; light-transmitting ink 23; black ink 24; OCA optical adhesive 8;
[0025] Key touch function pattern 31; GND wiring 32; glue overflow groove 11. DETAILED DESCRIPTION
[0026] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.
[0027] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.
[0028] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.
[0029] The utility model provides a key cover plate for improving the yield rate of silver paste screen printing, which comprises a glass substrate, a PET film, a conductive silver paste, an insulating oil, a carbon paste, a double-sided adhesive and a diffusion film, a light-shielding ink layer is screen-printed on the upper surface of the PET film, a void-avoiding portion is arranged on the light-shielding ink layer, a light-transmitting ink is screen-printed at the void-avoiding portion, a black ink is screen-printed on the upper surface of the light-shielding ink layer, the PET film is bonded to the lower surface of the glass substrate through an OCA optical adhesive; the conductive silver paste is screen-printed on the lower surface of the PET film; the insulating oil is arranged on the lower surface of the conductive silver paste, and the insulating oil avoids the void-avoiding portion; the carbon paste is arranged on the lower surface of the conductive silver paste and is connected with the conductive silver paste, and the carbon paste is located at the void-avoiding portion of the insulating oil; the double-sided adhesive is attached to the lower surface of the insulating oil, and the double-sided adhesive avoids the carbon paste and the void-avoiding portion; the diffusion film is attached to the lower surface of the double-sided adhesive, and the diffusion film avoids the carbon paste.
[0030] Since the light-shielding ink layer, light-transmitting ink and black ink are all screen-printed on the upper surface of the PET film, and the conductive silver paste is screen-printed on the lower surface of the PET film, the lower surface of the PET film is relatively flat, which can improve the screen printing yield of the silver paste, reduce the number of defective products, and improve the competitiveness of the product; and the light-shielding ink layer, light-transmitting ink and black ink on the PET film and its upper surface can be directly purchased from outside, thereby splitting the production steps and further improving the product yield.
[0031] In order to enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The present invention is described in detail below in conjunction with the accompanying drawings and embodiments, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limitations on the present invention.
[0032] See also Figures 1 to 4The utility model provides a key cover plate for improving the yield of silver paste screen printing, which includes a glass substrate 1, a PET film 2, a conductive silver paste 3, an insulating oil 4, a carbon paste 5, a double-sided adhesive 6 and a diffusion film 7. The upper surface of the PET film 2 is screen-printed with a light-shielding ink layer 21, a space-avoiding portion 22 is provided on the light-shielding ink layer 21, and a light-transmitting ink 23 is screen-printed on the space-avoiding portion 22. The upper surface of the light-shielding ink layer 21 is screen-printed with black ink 24. The PET film 2 is attached to the lower surface of the glass substrate 1 through an OCA optical adhesive 8. The conductive silver paste 3 is screen-printed on the lower surface of the PET film 2; the insulating oil 4 is arranged on the lower surface of the conductive silver paste 3, and the insulating oil 4 avoids the gap 22; the carbon paste 5 is arranged on the lower surface of the conductive silver paste 3 and is connected with the conductive silver paste 3, and the carbon paste 5 is located at the gap of the insulating oil 4; the double-sided adhesive 6 is pasted on the lower surface of the insulating oil 4, and the double-sided adhesive 6 avoids the carbon paste 5 and the gap 22; the diffusion film 7 is pasted on the lower surface of the double-sided adhesive 6, and the diffusion film 7 avoids the carbon paste 5, and the double-sided adhesive 6 can be used to be attached to the entire machine casing. Since the light-shielding ink layer 21, the light-transmitting ink 23 and the black ink 24 are all screen-printed on the upper surface of the PET film 2, and the conductive silver paste 3 is screen-printed on the lower surface of the PET film 2, the lower surface of the PET film 2 is relatively flat, which can improve the screen printing yield of the conductive silver paste 3, reduce the number of defective products, and improve the competitiveness of the product; and the PET film 2 and the light-shielding ink layer 21, the light-transmitting ink 23 and the black ink 24 on the upper surface of the PET film 2 can be directly purchased from outside, thereby splitting the production steps and further improving the product yield.
[0033] Furthermore, the insulating oil 4 is colorless and transparent insulating oil 4 to avoid absorbing light and improve the efficiency of light use.
[0034] Furthermore, the glass substrate 1 is transparent so that light can pass through the glass substrate 1 .
[0035] Furthermore, the glass substrate 1 is tempered glass to improve the strength of the glass substrate 1 .
[0036] Furthermore, the conductive silver paste 3 includes a key touch function pattern 31 located below the key avoidance portion 22 and a GND trace 32 surrounding the key touch function pattern 31. The carbon paste 5 is connected to the ejector pin of the whole machine through the self-capacitance principle to connect the circuit signal to realize the touch function.
[0037] Furthermore, the key touch function pattern 31 avoids the space portion 22 .
[0038] See also Figure 5As a further optimization scheme of Example 1, in this embodiment, a frame-shaped overflow groove 11 is etched on the lower surface of the glass substrate 1 located in the non-visible area, and the OCA optical glue 8 is arranged in the area formed by the overflow groove 11. Since the overflow groove 11 is provided on the lower surface of the glass substrate 1, when the OCA optical glue 8 is applied, the OCA optical glue 8 will overflow outward under pressure, and the excess glue will flow into and be stored in the overflow groove 11 to prevent it from continuing to spread outward, thereby limiting the overflow range, which can effectively prevent the OCA optical glue 8 from overflowing and causing light leakage.
[0039] Furthermore, the shape of the overflow glue groove 11 can be convenient for the design of the etching shape, and the cross section is not limited to semicircular, V-shaped, etc. The thickness of the glass substrate 1 commonly used in the industry is about 0.8 mm, and the thickness of the OCA optical glue 8 is about 0.1 mm. The etching depth of the overflow glue groove 11 can be designed to be 0.05 mm, and adjusted according to the actual overflow glue amount.
[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0041] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.
Claims
1. A key cover plate for improving the yield of silver paste screen printing, characterized in that: It includes: Glass substrate; A PET film, a light-shielding ink layer is screen-printed on the upper surface thereof, a void-avoiding portion is provided on the light-shielding ink layer, light-transmitting ink is screen-printed on the void-avoiding portion, black ink is screen-printed on the upper surface of the light-shielding ink layer, and the PET film is bonded to the lower surface of the glass substrate via OCA optical glue; Conductive silver paste, which is screen-printed on the lower surface of the PET film; Insulating oil, which is disposed on the lower surface of the conductive silver paste, and the insulating oil avoids the air-avoiding portion; A carbon paste is disposed on the lower surface of the conductive silver paste and is in electrical communication with the conductive silver paste, and the carbon paste is located at a place where the insulating oil is avoided; A double-sided adhesive is attached to the lower surface of the insulating oil, and the double-sided adhesive avoids the carbon slurry and the air-avoiding portion; A diffusion film is adhered to the lower surface of the double-sided adhesive, and the diffusion film avoids the carbon paste.
2. The key cover plate for improving the silver paste screen printing yield according to claim 1, characterized in that: The insulating oil is colorless and transparent insulating oil.
3. The key cover plate for improving the yield of silver paste screen printing according to claim 1, characterized in that: The glass substrate is transparent.
4. The key cover plate for improving the yield of silver paste screen printing according to claim 1, characterized in that: The glass substrate is tempered glass.
5. The key cover plate for improving the yield of silver paste screen printing according to claim 1, characterized in that: The conductive silver paste includes a key touch function pattern located below the key gap portion and a GND trace surrounding the key touch function pattern.
6. The key cover plate for improving the yield of silver paste screen printing according to claim 5, characterized in that: The key touch function pattern avoids the space avoiding portion.
7. The key cover plate for improving the yield of silver paste screen printing according to claim 1, characterized in that: A frame-shaped overflowing glue groove is formed by etching on the lower surface of the glass substrate located in the non-visible area, and the OCA optical glue is arranged in the area formed by the overflowing glue groove.
8. The key cover plate for improving the yield of silver paste screen printing according to claim 7, characterized in that: The cross-sectional shape of the overflowing glue groove is V-shaped or semicircular.
9. The key cover plate for improving the yield of silver paste screen printing according to claim 7, characterized in that: The thickness of the glass substrate is 0.8 mm.
10. The key cover plate for improving the yield of silver paste screen printing according to claim 7, characterized in that: The depth of the glue overflow groove is 0.05 mm.