Fingerprint module

Abstract

The utility model provides a fingerprint module. The fingerprint module comprises a first circuit board, a second circuit board connected to one side of the first circuit board, a chip connected to the side, away from the first circuit board, of the second circuit board, a light guide ring connected between the peripheral side of the chip and the first circuit board, and an annular light-emitting element connected to the first circuit board. The first circuit board, the second circuit board and the light guide ring jointly define an annular groove matched with the light-emitting element, and the light-emitting element is located in the annular groove. One side of the light guide ring facing the light-emitting element forms a light-in surface, and one side of the light guide ring away from the first circuit board forms a light-out surface. The fingerprint module provided by the utility model can effectively solve the problem of non-uniform light emission.

Description

[Technical field]

[0001] The utility model belongs to the technical field of fingerprint identification, and in particular relates to a fingerprint module. [Background technology]

[0002] In fingerprint recognition technology, the fingerprint pattern on the finger can be collected by the fingerprint sensor device, and then the fingerprint pattern is compared with the fingerprint information stored in the system to determine whether it is correct or not, thereby realizing identity recognition; therefore, fingerprint recognition has the characteristics of easy use and high security, and can be used in scenarios such as device unlocking, waking up, and payment.

[0003] In the related art, in order to meet the diverse usage needs of users, some fingerprint modules will also be provided with light-emitting elements and light-guiding components for refracting the light emitted by the light-emitting elements to the outside world. There needs to be a certain distance between the light-emitting elements and the light-guiding components so that the emitted light can reach all parts of the receiving surface of the light-guiding components, which makes the fingerprint module relatively large and is prone to uneven brightness in different parts of the light guide ring. [Contents of the utility model]

[0004] The purpose of the utility model is to provide a fingerprint module, which can at least solve the problem in the related art that the luminous fingerprint module is difficult to have the characteristics of small size and uniform brightness.

[0005] The technical solution of the utility model is as follows: the fingerprint module includes a first circuit board, a second circuit board connected to one side of the first circuit board, a chip connected to the second circuit board on a side away from the first circuit board, an annular light guide ring connected between the outer peripheral side of the chip and the first circuit board, and a light-emitting element connected to the first circuit board; the first circuit board, the second circuit board, and the light guide ring are jointly enclosed to form an annular groove adapted to the light-emitting element, and the light-emitting element is located in the annular groove; a light-inlet surface is formed on the side of the light guide ring facing the light-emitting element, and a light-emitting surface is formed on the side of the light guide ring away from the first circuit board.

[0006] Furthermore, the second circuit board and the light emitting element are arranged at intervals; the light emitting element has a light output surface on the side facing the second circuit board, and a reflecting part opposite to the light output surface is formed on the second circuit board, and the areas of the light output surface, the reflecting part and the light incident surface increase successively.

[0007] Furthermore, a solder resist ink layer is connected to the periphery of the second circuit board, and at least a part of the solder resist ink layer is a reflective portion.

[0008] Furthermore, the solder resist ink layer is one of white, yellow, red, green and blue.

[0009] Furthermore, the light guide ring is a light-transmitting plastic part or a glass part.

[0010] Furthermore, a diffuser is attached to the light-entering surface.

[0011] Furthermore, the light guide ring includes a first light guide portion connected to the first circuit board and a second light guide portion bent and connected to the first light guide portion, and an end of the second light guide portion away from the first light guide portion is connected to the chip; the first light guide portion and the second light guide portion are both provided with a light-incoming surface.

[0012] Furthermore, a decorative part is also connected to the outer peripheral side of the light guide ring, and the decorative part includes a main body connected to the outside of the light guide ring, a first connecting part connected to the top of the main body and extending in a first direction, and a second connecting part connected to the bottom of the main body and extending in an opposite direction to the first direction. The first connecting part abuts against the top of the light guide ring, and the second connecting part is fixed to the first circuit board.

[0013] Furthermore, the first circuit board is one of a soft board, a hard board, and a hard-soft board.

[0014] Furthermore, the second circuit board is a hard board.

[0015] The beneficial effect of the utility model is that the light-emitting element is set in a ring shape, and the light-emitting element surrounds the outer periphery of the second circuit board and the inner side of the light guide ring, so that the light emitted by the light-emitting element can reach all parts of the light guide ring evenly, and the fingerprint module can emit light evenly. In addition, the fingerprint module of the utility model has a simple structure and a clever design, so that the volume of the fingerprint module can be made smaller.

Brief Description of the Drawings

[0016] Figure 1 This is a schematic diagram of the overall structure of the fingerprint module of the utility model when viewed from above;

[0017] Figure 2 This is a cross-sectional schematic diagram of an implementation method of the fingerprint module of the utility model;

[0018] Figure 3 It is a cross-sectional schematic diagram of another implementation manner of the fingerprint module of the utility model. [Specific implementation method]

[0019] The embodiments of the utility model are described in detail below, 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 having 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 utility model, and cannot be understood as limiting the utility model. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the utility model.

[0020] 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", "circumferential", "radial" 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.

[0021] In addition, the terms "first", "second", etc. 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" or "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] Example:

[0023] like Figure 1-3 As shown, in this embodiment, the fingerprint module includes a first circuit board 1, a second circuit board 2 connected to one side of the first circuit board 1, a chip 3 connected to the second circuit board 2 on the side facing away from the first circuit board 1, a light guide ring 5 connected between the outer peripheral side of the chip 3 and the first circuit board 1, and a light-emitting element 4 in a ring shape and connected to the first circuit board 1; the first circuit board 1, the second circuit board 2, and the light guide ring 5 are jointly enclosed to form an annular groove a adapted to the light-emitting element 4, and the light-emitting element 4 is located in the annular groove a; a light-inlet surface 51 is formed on the side of the light guide ring 5 facing the light-emitting element 4, and a light-emitting surface 52 is formed on the side of the light guide ring 5 away from the first circuit board 1.

[0024] Specifically, the light-emitting element 4 in this embodiment can be an LED lamp. The LED lamp is small in size and light in weight. It will not take up too much space inside the fingerprint module, and is easy to install. At the same time, it is conducive to the lightweight of the fingerprint module. The LED lamp can also emit light of different colors to meet the user's diverse display needs and aesthetic needs. The light-emitting element 4 can be set to be annular and fixed in the annular groove a formed by the first circuit board 1, the second circuit board 2, and the light guide ring 5. That is, the light-emitting element 4 surrounds the outer periphery of the second circuit board 2 and the inner side of the light guide ring 5, so that the light emitted by the light-emitting element 4 can reach all parts of the light guide ring 5 evenly, realizing uniform light emission of the fingerprint module. In addition, the fingerprint module of this embodiment has a simple structure and a clever design, so that the volume of the fingerprint module can be made smaller.

[0025] like Figure 2As shown, in one embodiment, the first circuit board 1, the second circuit board 2, the chip 3, and the light guide ring 5 are jointly enclosed to form an annular groove a, and the second circuit board 2 is spaced apart from the light-emitting element 4 in the annular groove a; the light-emitting element 4 has a light output surface 41 on the side facing the second circuit board 2, and a reflective portion 211 is formed on the second circuit board 2, which is opposite to the light output surface 41, and the areas of the light output surface 41, the reflective portion 211, and the light input surface 51 increase successively.

[0026] Specifically, the light emitting element 4 of the present embodiment can be a side-emitting LED lamp, and the light output surface 41 is located on the side of the light emitting element 4 close to the second circuit board 2, so that the light emitted by the light emitting element 4 can first reach the reflecting portion 211 of the second circuit board 2 and then be reflected to the light input surface 51 of the light guide ring 5. That is, without increasing the distance between the light emitting element 4 and the light guide ring 5, the path of light propagation between the light emitting element 4 and the light guide ring 5 is lengthened, thereby achieving the effect of astigmatism.

[0027] It can be understood that in this embodiment, the projection area of ​​the chip 3 can be larger than the projection area of ​​the second circuit board 2, and the top of the light emitting element 4 is directly opposite to the edge of the bottom side of the chip 3. Therefore, in some embodiments, the edge of the bottom side of the chip 3 can also be set as a reflective portion 211, that is, part of the light can first reflect the light reaching the second circuit board 2 to the chip 3, and then reflect from the chip 3 to the light inlet surface 51 of the light guide ring 5. Such a setting further increases the path for the light to propagate between the light emitting element 4 and the light guide ring 5, improves the astigmatism effect, and makes the brightness of the light output from each part of the light emitting surface 52 more uniform. Of course, in some other embodiments, the light output surface 41 can also be set at the top of the light emitting element 4, so that the optical fiber can reach the reflective portion 211 at the bottom of the chip 3, and then reflect to the light inlet surface 51, and then refract multiple times in the light guide ring 5 and emit from the light emitting surface 52. In addition, the light output surface 41 can also be set on the side of the light emitting element 4 away from the second circuit board 2, that is, the light emitted by the light emitting element 4 can be directly emitted to the light guide ring 5, which is not limited here.

[0028] like Figure 3 As shown, in this embodiment, a diffuser sheet 7 is attached to the light entrance surface 51 . The use of the diffuser sheet 7 can enhance the diffuser effect of the light guide ring 5 , making the light emitted from the light guide ring 5 more uniform and soft.

[0029] like Figure 3As shown, in another embodiment, the light guide ring 5 includes a first light guide portion 53 connected to the first circuit board 1 and a second light guide portion 54 bent and connected to the first light guide portion 53, and one end of the second light guide portion 54 away from the first light guide portion 53 is connected to the chip 3; the first light guide portion 53 and the second light guide portion 54 are both provided with a light inlet surface 51. That is, the projection area of ​​the chip 3 can be equal to the projection area of ​​the second circuit board 2, the first circuit board 1, the second circuit board 2, and the light guide ring 5 directly enclose to form an annular groove a, the light emitting element 4 can be set to a single-side light output form, or can be set to a multi-side light output form; the light emitted by the light emitting element 4 can be directly emitted to the light inlet surface 51 or reflected by the reflective portion 211 of the second circuit board 2 and then emitted to the light inlet surface 51, and then the light passes through the diffuser 7, and then refracted in the first light guide portion 53 and / or the second light guide portion 54, and finally reaches the outside of the fingerprint module, thereby achieving uniform light emission of the fingerprint module.

[0030] In the present embodiment, the outer periphery of the second circuit board 2 is connected with a solder resist ink layer 21, and at least part of the solder resist ink layer 21 is a reflective portion 211. Specifically, the outer sides of the first circuit board 1 and the second circuit board 2 can be provided with a solder resist ink layer 21. The presence of the solder resist ink layer 21 can protect the circuits on the first circuit board 1 and the second circuit board 2, and the light can be directly reflected on the solder resist ink layer 21, and the reflection effect is good. The first circuit board 1 and the second circuit board 2, the first circuit board 1 and the light-emitting element 4, and the second circuit board 2 and the chip 3 can be connected by soldering with solder paste. Furthermore, in the present embodiment, the solder resist ink layer 21 can be one of white, yellow, red, green, and blue. Preferably, the solder resist ink layer 21 is white, and has good reflection and astigmatism effects, which is beneficial to improving the uniformity and reliability of the fingerprint module light emission.

[0031] In this embodiment, the light guide ring 5 can be a light-transmitting plastic or glass part with good light-guiding performance and low production and processing costs, wherein the material of the plastic part can be PC. The light guide ring 5 can be bonded to the first circuit board 1 by an adhesive, and the connection stability is good.

[0032] In this embodiment, an insulating layer 31 is also provided on the side of the chip 3 facing away from the second circuit board 2, which can protect the chip 3 and decorate the chip 3, and can allow the user's fingerprint information to penetrate and be sensed by the chip 3. In this embodiment, the insulating layer 31 is one of a paint-cured part, a glass part, and a ceramic part. That is, the insulating layer can be a spray paint layer or a cover plate. Preferably, the insulating layer 31 is a paint-cured part, and the paint is sprayed on the surface of the chip 3, and the paint is cured to form the desired paint-cured part. The paint-cured part is not only insulated, but also waterproof and oil-proof. Of course, the insulating layer 31 can also be a glass part, and the glass part can be directly bonded to the surface of the chip 3 by an adhesive. The structure is simple and easy to assemble, which is conducive to improving production efficiency.

[0033] In this embodiment, the outer peripheral side of the light guide ring 5 is also connected to a decorative part 6, which includes a main body 61 connected to the outside of the light guide ring 5, a first connecting part 62 connected to the top of the main body 61 and extending in the first direction, and a second connecting part 63 connected to the bottom of the main body 61 and extending in the opposite direction of the first direction. The first connecting part 62 abuts against the top of the light guide ring 5, and the second connecting part 63 is fixed to the first circuit board 1. That is, the second connecting part 63 and the first circuit board 1 can be bonded and fixed by an adhesive, and the first connecting part 62 and the outer edge of the top side of the light guide ring 5; the main body 61, the first connecting part 62, and the second connecting part 63 can be an integrally formed metal part, and the material of the metal part can be aluminum or stainless steel; the decorative part 6 formed by the metal part is just adapted to the shape of the light guide ring 5 and the first circuit board 1, and the setting of the decorative part 6 can make the appearance of the fingerprint module more beautiful and firm.

[0034] In this embodiment, the first circuit board 1 is one of a soft board, a hard board, and a combination of soft and hard boards. Preferably, the first circuit board 1 is a soft board, which is conducive to improving the user's feel for fingerprint manipulation operations. The second circuit board 2 can be a hard board, so that the fingerprint module can have both feel and texture. It is understandable that in the actual production and application process, technicians in this field can choose the material of the first circuit board 1 and / or the second circuit board 2 as a hard board or a soft board according to actual needs; and technicians in this field can also set the overall main structure of the fingerprint module to a quadrilateral, rounded quadrilateral, circle, ellipse or other polygonal structures commonly used in the field according to actual needs; technicians in this field can also adjust the size parameters of the first circuit board 1, the second circuit board 2, the chip 3 and other devices as needed. No limitation is made here.

[0035] The above is only an implementation method of the present invention. It should be pointed out that a person skilled in the art can make improvements without departing from the inventive concept of the present invention, but these improvements are all within the protection scope of the present invention.

Claims

1. A fingerprint module, comprising a first circuit board, a second circuit board connected to one side of the first circuit board, a chip connected to the second circuit board on a side away from the first circuit board, a light guide ring connected between the outer peripheral side of the chip and the first circuit board, and a ring-shaped light-emitting element connected to the first circuit board; characterized in that: The first circuit board, the second circuit board, and the light guide ring together form an annular groove adapted to the light-emitting element, and the light-emitting element is located in the annular groove; the light guide ring has a light input surface on the side facing the light-emitting element, and has a light output surface on the side away from the first circuit board.

2. The fingerprint module according to claim 1, characterized in that: The second circuit board and the light emitting element are arranged at intervals; the light emitting element has a light output surface on the side facing the second circuit board, and a reflecting portion opposite to the light output surface is formed on the second circuit board, and the areas of the light output surface, the reflecting portion and the light incident surface increase successively.

3. The fingerprint module according to claim 2, characterized in that: A solder resist ink layer is connected to the outer periphery of the second circuit board, and at least a part of the solder resist ink layer is the reflective portion.

4. The fingerprint module according to claim 3, characterized in that: The solder resist ink layer is one of white, yellow, red, green and blue.

5. The fingerprint module according to claim 1, characterized in that: The light guide ring is a light-transmitting plastic part or a glass part.

6. The fingerprint module according to claim 1, characterized in that: A light diffuser is attached to the light-entering surface.

7. The fingerprint module according to claim 1, characterized in that: The light guide ring includes a first light guide portion connected to the first circuit board and a second light guide portion bent and connected to the first light guide portion, and an end of the second light guide portion away from the first light guide portion is connected to the chip; the first light guide portion and the second light guide portion both have the light incident surface.

8. The fingerprint module according to claim 1, characterized in that: A decorative part is also connected to the outer peripheral side of the light guide ring, and the decorative part includes a main body connected to the outside of the light guide ring, a first connecting part connected to the top of the main body and extending in a first direction, and a second connecting part connected to the bottom of the main body and extending in the opposite direction of the first direction. The first connecting part abuts against the top of the light guide ring, and the second connecting part is fixed to the first circuit board.

9. The fingerprint module according to claim 1, characterized in that: The first circuit board is one of a soft board, a hard board, and a hard-soft board.

10. The fingerprint module according to claim 1, characterized in that: The second circuit board is a hard board.

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