Fingerprint identification module with Dome key
By using the combination of FPC, 3D steel sheet and reinforcement sheet in the fingerprint recognition module, the precise positioning and fixing of Dome keys is solved, and the problems of high costs and difficulty in mounting Dome keys are reduced, and the mold composition cost is improved. Competitiveness.
Patent Information
- Application Number
- CN202323594544.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2033-12-27
AI Technical Summary
The existing fingerprint recognition modules need to use a hardware and soft board when integrating Dome keys, resulting in high cost and reduced competitiveness. The Dome key cannot be directly attached to the middle area of the 3D steel sheet on the back of the FPC.
FPC is used to combine 3D steel sheets, reinforcement sheets and double-sided adhesives, and precise positioning of the positioning columns and holes is achieved to achieve the collection and fixation of Dome bonds, avoiding the use of soft and hard combination plates.
It reduces the production cost of fingerprint recognition modules, improves product competitiveness, and solves the problem that Dome buttons cannot be directly attached to the back of the FPC.
Smart Images
Figure CN222189913U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of electronic equipment, and more specifically to a fingerprint recognition module with a Dome key. Background Art
[0002] At present, mainstream fingerprint recognition modules usually also serve as power buttons to simplify the structural design and reduce costs. In this case, the fingerprint recognition module needs to be pressed as a physical button, which requires that the fingerprint recognition module must be fixed on the whole machine and have a certain amount of room for movement after installation and fixation. Therefore, the module substrate needs to adopt a hard-soft combination board. For example, when the whole machine design requires the Dome button to be placed on the fingerprint recognition module, the Dome button can be attached to the BOT surface of the substrate by using a hard-soft combination board. However, the mold opening cost and unit price of the hard-soft combination board are too high, which is not conducive to the control of development costs and unit costs, thereby making the cost of the fingerprint recognition module too high and reducing the product competitiveness of the fingerprint recognition module. Utility Model Content
[0003] The technical problem to be solved by the utility model is how to integrate the Dome key on the fingerprint recognition module by only using FPC, so as to reduce the production cost of the fingerprint recognition module 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 fingerprint recognition module with a Dome key, which includes an FPC, a fingerprint chip, a Dome key, a 3D steel sheet, a first reinforcement sheet and a double-sided adhesive, wherein the FPC includes a fingerprint area, a bending area and a Dome area, the fingerprint area is located at the end of the FPC, the Dome area is located on the inner side of the FPC, and the bending area is located between the fingerprint area and the Dome area; the fingerprint chip is arranged on the lower surface of the fingerprint area of the FPC; the Dome key is arranged on the lower surface of the Dome area of the FPC; the 3D steel sheet is arranged on the upper surface of the fingerprint area of the FPC, and at least one positioning column is arranged on the upper surface of the 3D steel sheet; the first reinforcement sheet is arranged on the upper surface of the Dome area of the FPC, and the first reinforcement sheet is provided with positioning holes corresponding to the positions and number of the positioning columns; the double-sided adhesive is attached to the upper surface of the first reinforcement sheet.
[0006] As a preferred implementation of the fingerprint recognition module with Dome key provided by the utility model, there are two positioning columns, and the two positioning columns are respectively arranged at two ends of the 3D steel sheet.
[0007] As a preferred embodiment of the fingerprint recognition module with Dome key provided by the utility model, the FPC includes a substrate layer, a circuit layer arranged on the upper surface of the substrate layer, and a metal heat dissipation layer arranged on the lower surface of the substrate layer.
[0008] As a preferred embodiment of the fingerprint recognition module with Dome key provided by the utility model, the FPC also includes at least one through-hole penetrating the substrate layer, the circuit layer and the metal heat dissipation layer, and the inner wall of the through-hole is provided with a heat-conducting layer in contact with the circuit layer and the metal heat dissipation layer.
[0009] As a preferred implementation of the fingerprint recognition module with Dome key provided by the utility model, a heat conductor connected to an external heat-conducting structure is arranged in the through hole, and the heat conductor is in contact with the heat-conducting layer.
[0010] As a preferred implementation of the fingerprint recognition module with Dome key provided by the utility model, the structure of the metal heat dissipation layer is a mesh structure, a strip structure, a wavy structure or a honeycomb structure.
[0011] As a preferred implementation of the fingerprint recognition module with Dome key provided by the utility model, a second reinforcing sheet is arranged on the lower surface of the FPC, the second reinforcing sheet is arranged around the Dome key, and the second reinforcing sheet and the first reinforcing sheet are arranged staggered with each other.
[0012] As a preferred implementation of the fingerprint recognition module with Dome key provided by the utility model, the overall widths of the first reinforcement sheet and the second reinforcement sheet are different.
[0013] As a preferred implementation of the fingerprint recognition module with Dome key provided by the utility model, the material of the first reinforcement sheet and the second reinforcement sheet is FR4, PI or stainless steel.
[0014] As a preferred implementation of the fingerprint recognition module with Dome key provided by the utility model, the outer surfaces of the first reinforcement sheet and the second reinforcement sheet are both provided with a surface treatment layer for improving the surface roughness.
[0015] The utility model has the following beneficial effects:
[0016] Since the fingerprint area is provided with a 3D steel sheet and the Dome area is provided with a first reinforcement sheet, the fingerprint chip and the Dome key can be fixed on the fingerprint area and the Dome area respectively, and the 3D steel sheet is provided with a positioning column, and the first reinforcement sheet is provided with a corresponding positioning hole. The upper surface of the first reinforcement sheet is also provided with double-sided adhesive, so that when the fingerprint area of the FPC is bent 180° to the Dome area, it can be positioned by the positioning column and the positioning hole, and then the 3D steel sheet and the first reinforcement sheet are pasted and fixed by double-sided adhesive. The position accuracy is controlled by the positioning hole and the positioning column, so that the Dome key can be assembled on the fingerprint recognition module without the need to adopt the soft and hard combination board method, avoiding the mold opening cost and unit price being too high, which is conducive to the control of development costs and cost unit price, thereby reducing the cost of the fingerprint recognition module and improving the product competitiveness of the fingerprint recognition module. It also solves the situation that when the end customer needs to directly add the Dome key to the fingerprint recognition module, the back of the conventional fingerprint structure FPC is the middle area of the 3D steel sheet and the Dome key cannot be directly placed. 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 1 The present invention provides a structural schematic diagram of a fingerprint recognition module with a Dome key.
[0019] Figure 2 for Figure 1 A partial enlarged view of .
[0020] Figure 3 for Figure 1 Flipped diagram of the center front view.
[0021] Figure 4 for Figure 3 A partial enlarged view of .
[0022] Figure 5 for Figure 1 Schematic diagram of the structure after flipping.
[0023] Figure 6 for Figure 5 A partial enlarged view of .
[0024] Figure 7 for Figure 1 Schematic diagram of the structure of FPC.
[0025] Figure 8 for Figure 1Schematic diagram of the improved structure.
[0026] Fig. 9 for Figure 8 A partial enlarged view of .
[0027] Description of Figure Numbers:
[0028] FPC1; fingerprint chip 2; Dome key 3; 3D steel sheet 4; first reinforcing sheet 5; double-sided adhesive 6; fingerprint area 100; bending area 200; Dome area 300; positioning column 41; positioning hole 51;
[0029] Base material layer 11; circuit layer 12; metal heat dissipation layer 13; through hole 14;
[0030] Second reinforcing sheet 7. DETAILED DESCRIPTION
[0031] 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.
[0032] 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.
[0033] 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.
[0034] The utility model provides a fingerprint recognition module with a Dome key, which comprises an FPC, a fingerprint chip, a Dome key, a 3D steel sheet, a first reinforcing sheet and a double-sided adhesive, wherein the FPC comprises a fingerprint area, a bending area and a Dome area, wherein the fingerprint area is located at the end of the FPC, the Dome area is located at the inner side of the FPC, and the bending area is located between the fingerprint area and the Dome area; the fingerprint chip is arranged on the lower surface of the fingerprint area of the FPC; the Dome key is arranged on the lower surface of the Dome area of the FPC; the 3D steel sheet is arranged on the upper surface of the fingerprint area of the FPC, and at least one positioning column is arranged on the upper surface of the 3D steel sheet; the first reinforcing sheet is arranged on the upper surface of the Dome area of the FPC, and positioning holes corresponding to the positions and number of the positioning columns are arranged on the first reinforcing sheet; and the double-sided adhesive is adhered to the upper surface of the first reinforcing sheet.
[0035] Since the fingerprint area is provided with a 3D steel sheet and the Dome area is provided with a first reinforcement sheet, the fingerprint chip and the Dome key can be fixed on the fingerprint area and the Dome area respectively, and the 3D steel sheet is provided with a positioning column, and the first reinforcement sheet is provided with a corresponding positioning hole. The upper surface of the first reinforcement sheet is also provided with double-sided adhesive, so that when the fingerprint area of the FPC is bent 180° to the Dome area, it can be positioned by the positioning column and the positioning hole, and then the 3D steel sheet and the first reinforcement sheet are pasted and fixed by double-sided adhesive. The position accuracy is controlled by the positioning hole and the positioning column, so that the Dome key can be assembled on the fingerprint recognition module without the need to adopt the soft and hard combination board method, avoiding the mold opening cost and unit price being too high, which is conducive to the control of development costs and cost unit price, thereby reducing the cost of the fingerprint recognition module and improving the product competitiveness of the fingerprint recognition module. It also solves the situation that when the end customer needs to directly add the Dome key to the fingerprint recognition module, the back of the conventional fingerprint structure FPC is the middle area of the 3D steel sheet and the Dome key cannot be directly placed.
[0036] 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.
[0037] Example 1
[0038] See also Figures 1 to 6 , a fingerprint recognition module with a Dome key provided by the utility model, Figure 1 , Figure 2 , Figure 5 and Figure 6 From top to bottom, they are a top view, a front view and a bottom view. A fingerprint recognition module with a Dome key includes an FPC1, a fingerprint chip 2, a Dome key 3, a 3D steel sheet 4, a first reinforcing sheet 5 and a double-sided adhesive 6. The FPC1 includes a fingerprint area 100, a bending area 200 and a Dome area 300 arranged in sequence from left to right. The fingerprint area 100 is located at the end of the FPC1, the Dome area 300 is located on the inner side of the FPC1, and the bending area 200 is located between the fingerprint area 100 and the Dome area 300; The pattern chip 2 is arranged on the lower surface of the fingerprint area 100 of the FPC1; the Dome key 3 is arranged on the lower surface of the Dome area 300 of the FPC1; the 3D steel sheet 4 is arranged on the upper surface of the fingerprint area 100 of the FPC1, and at least one positioning column 41 is arranged on the upper surface of the 3D steel sheet 4; the first reinforcement sheet 5 is arranged on the upper surface of the Dome area 300 of the FPC1, and the first reinforcement sheet 5 is provided with positioning holes 51 corresponding to the positions and numbers of the positioning columns 41; the double-sided adhesive 6 is adhered to the upper surface of the first reinforcement sheet 5.
[0039] Furthermore, in this embodiment, there are two positioning posts 41 , which are respectively disposed at two ends of the 3D steel sheet 4 , and there are also two positioning holes 51 .
[0040] Example 2
[0041] See also Figure 7 As a further optimization scheme of Example 1, in this embodiment, the FPC1 includes a substrate layer 11, a circuit layer 12 arranged on the upper surface of the substrate layer 11, and a metal heat dissipation layer 13 arranged on the lower surface of the substrate layer 11. The arrangement method can be that the circuit layer 12 and the metal heat dissipation layer 13 are respectively attached to the substrate layer 11 by double-sided adhesive. Since the thickness of the substrate layer 11 is relatively thin, the heat on the FPC1 can be diffused to the metal heat dissipation layer 13 through the substrate layer 11. The metal heat dissipation layer 13 can effectively increase the heat dissipation area of the FPC1 and play a role in uniform heat dissipation, thereby improving the heat dissipation efficiency of the FPC1. The substrate layer 11 can be any one of polyimide, polyester, polysulfone or polytetrafluoroethylene, the double-sided adhesive is any one of an acrylic adhesive layer or an epoxy resin adhesive layer, and the metal heat dissipation layer 13 can be a copper foil layer.
[0042] Furthermore, the FPC1 further includes at least one through-hole 14 penetrating the substrate layer 11, the circuit layer 12 and the metal heat dissipation layer 13, and the inner wall of the through-hole 14 is provided with a heat-conducting layer in contact with the circuit layer 12 and the metal heat dissipation layer 13. By utilizing the good thermal conductivity of the through-hole 14, the circuit layer 12 and the metal heat dissipation layer 13 on both sides of the substrate layer 11 can be electrically connected to play a good thermal conductivity function, and the thermal conductive layer can provide a thermal conductive function to achieve a good heat dissipation effect. Among them, the thermal conductive layer can be a copper glue conductive ink layer.
[0043] Furthermore, a heat conductor connected to an external heat-conducting structure is disposed in the through hole 14. The heat conductor is connected to the external heat-conducting structure from one side of the circuit layer 12 and is also in contact with the heat-conducting layer in the through hole 14, so that the circuit layer 12 and the metal heat dissipation layer 13 can be connected to the external heat-conducting structure through the through hole 14, so that the heat in the FPC 1 can be diffused to the external heat-conducting structure through the heat conductor in the through hole 14, so as to further improve the heat dissipation efficiency of the FPC 1. Preferably, in order to enable the through hole 14 to be connected to the external heat-conducting structure, the through hole 14 is disposed at the edge of the FPC 1.
[0044] Furthermore, the metal heat dissipation layer 13 is a uniform heat dissipation structure, and its structure can be any one of a mesh structure, a strip structure, a wavy structure or a honeycomb structure. Through the uniform heat dissipation structure, the heat dissipation effect can be better improved.
[0045] Example 3
[0046] See also Figure 8 and Fig. 9 In the traditional FPC1 design, there is usually no reinforcing sheet or the reinforcing sheets are placed at the same position and the width of the reinforcing sheets is the same, which results in the pressure applied being concentrated on the same straight line when plugging and unplugging the FPC1, resulting in a slight break in the FPC1 line. The lower surface of the FPC1 provided by the utility model is provided with a second reinforcing sheet 7, and the second reinforcing sheet 7 is arranged around the Dome key 3, and the first reinforcing sheet 5 and the second reinforcing sheet 7 are arranged staggered with each other. When the FPC1 is pulled out, the pressure exerted by the reinforcing sheets on both sides on the FPC1 is not on the same line segment, and the stress will not be concentrated on the same straight line when bending, thereby avoiding stress concentration and the problem of easy slight break in the line at the gold finger, and improving the product yield.
[0047] Furthermore, the first reinforcing sheet 5 and the second reinforcing sheet 7 referred to in the present invention may be staggered in two different positions respectively; or the center points may be at the same position, but the widths of the two reinforcing sheets are different. As long as the stress of the first reinforcing sheet 5 and the second reinforcing sheet 7 when bent is not concentrated on the same straight line, stress concentration and the problem of micro-breakage of the circuit at the gold finger can be avoided, thereby improving product yield.
[0048] Furthermore, the material of the first reinforcing sheet 5 and the second reinforcing sheet 7 is FR4, PI or stainless steel. In other embodiments, if the heat generated by the FPC1 is relatively large, a heat dissipation material with better heat dissipation effect, such as an aluminum foil reinforcing sheet, may also be used.
[0049] Furthermore, the outer surfaces of the first reinforcing sheet 5 and the second reinforcing sheet 7 are both provided with a surface treatment layer for increasing the surface roughness, so as to increase the friction between the worker and the first reinforcing sheet 5 and the second reinforcing sheet 7, so that the FPC 1 is easy to pull out.
[0050] Furthermore, the surface treatment layer is provided with diamond knurling on the outer surfaces of the first reinforcing sheet 5 and the second reinforcing sheet 7, so that the FPC 1 can be pulled out more easily, reducing the risk of the FPC 1 circuit being broken.
[0051] 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.
[0052] 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 fingerprint recognition module with a Dome key, characterized in that: It includes: The FPC comprises a fingerprint area, a bending area and a Dome area, wherein the fingerprint area is located at the end of the FPC, the Dome area is located at the inner side of the FPC, and the bending area is located between the fingerprint area and the Dome area; A fingerprint chip is disposed on the lower surface of the fingerprint area of the FPC; A Dome key, which is disposed on the lower surface of the Dome area of the FPC; A 3D steel sheet, which is arranged on the upper surface of the fingerprint area of the FPC, and at least one positioning column is arranged on the upper surface of the 3D steel sheet; A first reinforcing sheet, which is arranged on the upper surface of the Dome area of the FPC, and the first reinforcing sheet is provided with positioning holes corresponding to the positions and number of the positioning posts; The double-sided adhesive is adhered to the upper surface of the first reinforcing sheet.
2. The fingerprint recognition module with Dome key according to claim 1, characterized in that: There are two positioning posts, and the two positioning posts are respectively arranged at two ends of the 3D steel sheet.
3. The fingerprint recognition module with Dome key according to claim 1, characterized in that: The FPC includes a substrate layer, a circuit layer disposed on an upper surface of the substrate layer, and a metal heat dissipation layer disposed on a lower surface of the substrate layer.
4. The fingerprint recognition module with Dome key according to claim 3, characterized in that: The FPC further includes at least one through-hole penetrating the substrate layer, the circuit layer and the metal heat dissipation layer, and an inner wall of the through-hole is provided with a heat-conducting layer in contact with the circuit layer and the metal heat dissipation layer.
5. The fingerprint recognition module with Dome key according to claim 4, characterized in that: A heat conductor connected to an external heat-conducting structure is arranged in the through hole, and the heat conductor is in contact with the heat-conducting layer.
6. The fingerprint recognition module with Dome key according to claim 3, characterized in that: The structure of the metal heat dissipation layer is a mesh structure, a strip structure, a wave structure or a honeycomb structure.
7. The fingerprint recognition module with Dome key according to claim 1, characterized in that: A second reinforcing sheet is disposed on the lower surface of the FPC. The second reinforcing sheet is disposed around the Dome key, and the second reinforcing sheet and the first reinforcing sheet are disposed staggered with each other.
8. The fingerprint recognition module with Dome key according to claim 7, characterized in that: The first reinforcing sheet and the second reinforcing sheet have different overall widths.
9. The fingerprint recognition module with Dome key according to claim 7, characterized in that: The first reinforcing sheet and the second reinforcing sheet are made of FR4, PI or stainless steel.
10. The fingerprint recognition module with Dome key according to claim 7, characterized in that: The outer surfaces of the first reinforcing sheet and the second reinforcing sheet are both provided with a surface treatment layer for improving surface roughness.