Small TPU fingerprint module

Abstract

The utility model provides a miniature TPU fingerprint module group, comprising an FPC circuit board, the FPC circuit board comprises a chip connecting part, a connector connecting part and a transmission part located between the chip connecting part and the connector connecting part, one side surface of the chip connecting part is connected with a first steel sheet, and the other side surface is connected with a fingerprint chip. A small TPU elastic piece is arranged on the side, away from the FPC circuit board, of the first steel sheet, the small TPU elastic piece and the first steel sheet are fixedly connected through glue, the length of the first steel sheet is larger than that of the small TPU elastic piece, convex parts used for positioning installation are arranged at the two ends of the first steel sheet in the length direction, a plurality of convex edges are arranged on the side, facing the first steel sheet, of the small TPU elastic piece, and the convex edges are fixedly connected with the first steel sheet through glue. The protruding edges are arranged at intervals in the length direction of the small TPU elastic piece, first combination grooves allowing glue to flow in are formed between the adjacent protruding edges, and second combination grooves allowing the glue to flow in are formed in part of the protruding edges.

Description

Technical Field

[0001] The utility model relates to the field of fingerprint module structure design, in particular to a small TPU fingerprint module. Background Art

[0002] like Figure 1-Figure 3 At present, the side fingerprint module mostly adopts a long strip TPU elastic part 1 (TPU is thermoplastic polyurethane elastomer rubber). The long strip TPU elastic part 1 is longer than the steel sheet. Both ends of the long strip TPU elastic part 1 are provided with ears 2 for installation and positioning in the mobile phone. The long strip TPU elastic part 1 has high mold opening cost, is easy to change, and is not easy to install. The direction must be distinguished during installation. The long strip TPU elastic part 1 also needs to be provided with an installation direction mark 3. In view of this, it is necessary to provide a new fingerprint module structure, design the TPU elastic part in the fingerprint module in the direction of miniaturization, use other components to position and install, and at the same time ensure the connection firmness of the TPU elastic part and the steel sheet to overcome the shortcomings of the existing long strip TPU elastic part. Utility Model Content

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a small TPU fingerprint module. The utility model at least solves some of the problems in the prior art.

[0004] The utility model is achieved in this way:

[0005] The utility model provides a small TPU fingerprint module, including an FPC circuit board, the FPC circuit board includes a chip connection part, a connector connection part and a transmission part located between the chip connection part and the connector connection part, one side surface of the chip connection part is connected to a first steel sheet, and the other side surface is connected to a fingerprint chip, a small TPU elastic part is arranged on the side of the first steel sheet away from the FPC circuit board, the small TPU elastic part and the first steel sheet are fixedly connected by glue, the length of the first steel sheet is greater than the length of the small TPU elastic part, and the first steel sheet is provided with convex parts for positioning and installation at both ends along the length direction. shaped portion, a plurality of ridges are provided on the side of the small TPU elastic member facing the first steel sheet, the ridges are spaced apart along the length direction of the small TPU elastic member, a first combining groove for glue to flow in is provided between adjacent ridges, and a second combining groove for glue to flow in is provided on some ridges, a pressing protrusion is provided on the side of the small TPU elastic member away from the first steel sheet, the width of the fingerprint chip is greater than the width of the chip connecting portion, one side of the fingerprint chip in the width direction is aligned with the chip connecting portion, and the other side of the fingerprint chip in the width direction extends out of the chip connecting portion for glue dispensing, and an anti-overflow groove is provided on the side of the fingerprint chip facing the chip connecting portion.

[0006] Furthermore, the small TPU elastic member is an axisymmetric structure.

[0007] Furthermore, the transmission part is provided with exposed copper for grounding.

[0008] Furthermore, along the width direction of the transmission part, a piece of exposed copper is provided on both sides of the transmission part.

[0009] Furthermore, the length of the small TPU elastic member is 4.6-5 mm.

[0010] Furthermore, the chip connection portion is connected to the first steel sheet via a conductive adhesive.

[0011] Furthermore, one end of the first steel sheet located on the FPC circuit board is fixedly connected to the FPC circuit board by UV neck glue.

[0012] Furthermore, a side of the fingerprint chip facing away from the chip connection portion is coated with a paint coating for protecting the chip.

[0013] The utility model has the following beneficial effects:

[0014] 1. The utility model provides a small TPU fingerprint module. The length of the small TPU elastic part is less than the length of the first steel sheet. The utility model shortens the length of the TPU elastic part. Due to the advantage that the first steel sheet is easier to process, the first steel sheet is used for positioning and installation. Positioning convex parts are provided at both ends of the first steel sheet, which are installed in cooperation with the positioning grooves in the mobile phone. In order to strengthen the connection firmness between the small TPU elastic part and the first steel sheet, the small TPU elastic part is provided with a plurality of ridges on one side facing the first steel sheet. Each of the ridges is arranged at intervals along the length direction of the small TPU elastic part. A first combining groove for glue to flow in is provided between adjacent ridges, and a second combining groove for glue to flow in is provided on some ridges. The utility model adopts a small TPU elastic part, which reduces the mold opening cost and is less likely to deform than a long strip TPU elastic part. In addition, in the utility model, the small TPU elastic part is a symmetrical structure, and there is no need to distinguish the direction during installation, and there is no need to set an installation direction mark on the small TPU elastic part, which is more convenient for installation.

[0015] 2. In the utility model, after the fingerprint chip is welded to the chip connecting part, unilateral glue is dispensed at the welding point, that is, the width of the fingerprint chip is greater than the width of the chip connecting part, one side of the fingerprint chip in the width direction is aligned with the chip connecting part, and the other side of the fingerprint chip in the width direction extends out of the chip connecting part for glue dispensing. In order to avoid glue overflow, an anti-overflow groove can be provided on the side of the fingerprint chip facing the chip connecting part. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a front view of a long strip of TPU elastic member;

[0018] Figure 2 It is a side view of a long strip of TPU elastic member;

[0019] Figure 3 It is a rear view of the long strip TPU elastic member;

[0020] Figure 4 A front view of a small TPU elastic member provided in an embodiment of the utility model;

[0021] Figure 5 A side view provided for an embodiment of the utility model;

[0022] Figure 6 A rear view provided for an embodiment of the utility model;

[0023] Figure 7 Schematic diagram of a small TPU fingerprint module provided by an embodiment of the utility model Figure 1 (The right side of the picture shows the outline comparison of the FPC circuit board, the first steel sheet, the small TPU elastic part, and the fingerprint chip. The fingerprint chip is actually on the side inside the computer).

[0024] Figure 8 The embodiment of the utility model provides Figure 7 The right side is a partial enlarged image;

[0025] Fig. 9 A side view of a small TPU fingerprint module provided by an embodiment of the utility model;

[0026] Fig.10 The embodiment of the utility model provides Fig. 9 A magnified view of the middle part;

[0027] Fig.11 The embodiment of the utility model provides Fig. 9 Magnified top view of ;

[0028] Fig.12 Schematic diagram of a small TPU fingerprint module provided by an embodiment of the utility model Figure 2 (and Figure 7 on the opposite side).

[0029] In the figure: long strip TPU elastic part 1, ear 2, installation direction mark 3, FPC circuit board 4, connector 5, first steel sheet 6, fingerprint chip 7, small TPU elastic part 8, convex part 9, convex ridge 10, first combining groove 11, second combining groove 12, pressing protrusion 13, glue dispensing 14, anti-overflow groove 15, exposed copper 16, conductive glue 17, UV neck glue 18, chip bottom filling glue 19, bending area 20, second steel sheet 21, chamfer 22, chip connection part 23, connector connection part 24, transmission part 25, paint coating 26, TPU black glue 27. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0031] like Figure 1-Figure 12 The utility model embodiment provides a small TPU fingerprint module, including an FPC circuit board 4, the FPC circuit board 4 includes a chip connection part 23, a connector connection part 24 and a transmission part 25 located between the chip connection part and the connector connection part. Along the thickness direction of the FPC circuit board 4, one side surface of the chip connection part is connected with a first steel sheet 6, and the other side surface is connected with a fingerprint chip 7, and the fingerprint chip 7 is welded to the chip connection part. A small TPU elastic part 8 is provided on the side of the first steel sheet 6 away from the FPC circuit board 4. The first steel sheet 6, the fingerprint chip 7, and the fingerprint chip 7 are connected to the chip connection part by welding. The texture chip 7 and the small TPU elastic member 8 are arranged opposite to each other. The small TPU elastic member 8 and the first steel sheet 6 are fixedly connected by glue. The glue can be TPU black glue 27. The length of the first steel sheet 6 is greater than the length of the small TPU elastic member 8. Both ends of the first steel sheet 6 along the length direction are provided with convex parts 9 for positioning and installation. The convex parts 9 are installed in cooperation with the positioning grooves in the mobile phone. The convex part 9 at one end of the first steel sheet 6 extends out of the FPC circuit board 4. The small TPU elastic member 8 is provided with a plurality of convex ridges 10 on one side facing the first steel sheet 6. Figure 6, except for the ridges 10 at the first and last ends, the rest of the ridges 10 are rectangular strips, each of which is arranged at intervals along the length direction of the small TPU elastic member, and a first binding groove 11 for glue to flow in is provided between adjacent ridges, and the first binding groove 11 is a rectangular groove, and a second binding groove 12 for glue to flow in is provided on some ridges 10, and the second binding groove 12 is a cylindrical groove, which further strengthens the connection firmness between the small TPU elastic member 8 and the first steel sheet 6, and the small TPU elastic member 8 is provided with a pressing protrusion 13 on the side away from the first steel sheet 6, and the shape of the pressing protrusion 13 can be designed according to actual needs. The pressing protrusion 13 is used to squeeze and contact with the switch key in the mobile phone. After the fingerprint chip 7 is pressed by the hand, the force is transmitted to the pressing protrusion 13, and the pressing protrusion 13 presses against the switch key, and the switch key is electrically connected to the mobile phone motherboard to transmit the signal to the mobile phone motherboard. The pressing protrusion 13 is arranged in the middle of the small TPU elastic member 8, and the small TPU elastic member 8 is provided with a chamfer 22 on the side facing the switch key for easy installation. A connector 5 is welded on one side surface of the connector connection part 24, and the connector 5 is used to be electrically connected to the mobile phone motherboard. A second steel sheet 21 is connected to the other side surface of the connector connection part 24. The second steel sheet 21 and the connector connection part 24 are fixedly connected by a conductive adhesive 17. A laser-engraved QR code (secret code) can be set on the second steel sheet 21, and a clear code can be set on the surface of the FPC circuit board 4.

[0032] In this embodiment, after the fingerprint chip is welded to the chip connecting part 23, unilateral glue is dispensed at the welding point. The width of the fingerprint chip 7 is greater than the width of the chip connecting part 23. One side of the fingerprint chip 7 in the width direction is aligned with the chip connecting part 23, and the other side of the fingerprint chip 7 in the width direction extends out of the chip connecting part 23 for glue dispense 14 (the glue dispensed is the chip bottom filling glue 19). The chip bottom filling glue 19 can prevent the pad from oxidation. The unilateral glue dispense has good fluidity of glue and can reduce the overflow ratio, thereby improving the glue dispense efficiency. The utility model solves the problem that the fingerprint chip is small in size and the glue is easy to overflow during the glue dispense process, affecting the quality of the side fingerprint module.

[0033] Preferably, an anti-overflow groove 15 is provided on one side of the fingerprint chip 7 facing the chip connection portion, and the anti-overflow groove 15 can prevent the chip bottom filling glue 19 from overflowing, and the anti-overflow groove 15 is processed by CNC.

[0034] In this embodiment, the length of the small TPU elastic member 8 is 4.8 mm. The small TPU elastic member 8 is an axisymmetric structure (symmetrical along the length direction and the width direction), and there is no need to distinguish the direction during installation.

[0035] The utility model provides a small TPU fingerprint module. The length of the small TPU elastic member 8 is less than the length of the steel sheet 6. The utility model shortens the length of the TPU elastic member. Due to the advantage that the first steel sheet is easier to process, the first steel sheet 6 is used for positioning and installation. Positioning convex parts 9 are provided at both ends of the first steel sheet 6, which are installed in cooperation with the positioning grooves in the mobile phone. In order to strengthen the connection firmness between the small TPU elastic member 8 and the first steel sheet 6, a plurality of convex ridges 10 are provided on the side of the small TPU elastic member 8 facing the first steel sheet 6. Each of the convex ridges 10 is arranged at intervals along the length direction of the small TPU elastic member. A first combining groove 11 for glue to flow in is provided between adjacent convex ridges 10, and a second combining groove 12 for glue to flow in is provided on some of the convex ridges 10. The utility model adopts a small TPU elastic member, reduces the mold opening cost, and is less likely to deform than a long strip TPU elastic member. In the utility model, the small TPU elastic member is a symmetrical structure, and there is no need to distinguish the direction during installation, and there is no need to set an installation direction mark on the small TPU elastic member, which is easy to install. The small TPU elastic part provided by the utility model is also convenient for designing reference positions during the mounting and assembly process, and is easy to identify misalignment, thereby enabling visual management.

[0036] In this embodiment, the transmission part 25 is provided with exposed copper 16 for whole device grounding. In this embodiment, along the width direction of the transmission part, a piece of exposed copper 16 is provided on both sides of the transmission part.

[0037] In this embodiment, the chip connection part 23 is connected to the first steel sheet 6 by a conductive adhesive 17, and the conductive adhesive 17 plays a fixing role. One end of the first steel sheet 6 located on the FPC circuit board 4 is fixedly connected to the FPC circuit board 4 by a UV neck adhesive 18, and the UV neck adhesive 18 can prevent the FPC from bending and tearing. The side of the fingerprint chip 7 away from the chip connection part is coated with a paint coating 26 for protecting the chip.

[0038] In this embodiment, two bending areas 20 can also be set on the transmission part. The bending area 20 is a copper-free structure, that is, part of the copper on the FPC circuit board 4 is removed, so that the part is more flexible and bendable, which is convenient for assembling the small TPU fingerprint module into the mobile phone.

[0039] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0040] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A small TPU fingerprint module, characterized in that: The invention comprises an FPC circuit board, wherein the FPC circuit board comprises a chip connection part, a connector connection part and a transmission part located between the chip connection part and the connector connection part, a first steel sheet is connected to one side surface of the chip connection part, and a fingerprint chip is connected to the other side surface of the chip connection part, a small TPU elastic part is arranged on the side of the first steel sheet away from the FPC circuit board, the small TPU elastic part and the first steel sheet are fixedly connected by glue, the length of the first steel sheet is greater than the length of the small TPU elastic part, both ends of the first steel sheet along the length direction are provided with convex parts for positioning and installation, a plurality of convex ridges are arranged on the side of the small TPU elastic part facing the first steel sheet, each of the convex ridges is arranged at intervals along the length direction of the small TPU elastic part, a first combining groove for glue to flow in is arranged between adjacent convex ridges, and a second combining groove for glue to flow in is arranged on some of the convex ridges, a pressing protrusion is arranged on the side of the small TPU elastic part away from the first steel sheet, the width of the fingerprint chip is greater than the width of the chip connection part, one side of the fingerprint chip in the width direction is aligned with the chip connection part, and the other side of the fingerprint chip in the width direction extends out of the chip connection part for dispensing, and an anti-overflow groove is arranged on the side of the fingerprint chip facing the chip connection part.

2. The small TPU fingerprint module according to claim 1, characterized in that: The small TPU elastic member is an axisymmetric structure.

3. The small TPU fingerprint module according to claim 1, characterized in that: The transmission part is provided with exposed copper for grounding.

4. The small TPU fingerprint module according to claim 3, characterized in that: Along the width direction of the transmission part, a piece of exposed copper is provided on both sides of the transmission part.

5. The small TPU fingerprint module according to claim 1, characterized in that: The length of the small TPU elastic piece is 4.6-5 mm.

6. The small TPU fingerprint module according to claim 1, characterized in that: The chip connection portion is connected to the first steel sheet via conductive adhesive.

7. The small TPU fingerprint module according to claim 1, characterized in that: One end of the first steel sheet located on the FPC circuit board is fixedly connected to the FPC circuit board by UV neck glue.

8. The small TPU fingerprint module according to claim 1, characterized in that: A paint coating for protecting the chip is coated on one side of the fingerprint chip away from the chip connection portion.

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