Fingerprint recognition apparatus and electronic device

Abstract

A fingerprint recognition apparatus and an electronic device, aiming to solve the technical problem that flexible circuit boards are prone to interfere with other structures on middle frames. In the fingerprint recognition apparatus, a fixing frame is arranged on the back surface of a fingerprint recognition module and is connected to the fingerprint recognition module; one end of a flexible circuit board is connected to the fingerprint recognition module; and part of the flexible circuit board is disposed on a mounting surface of the fixing frame facing away from the fingerprint recognition module, so that the flexible circuit board is disposed on the back surface of the fingerprint recognition module, preventing the flexible circuit board from extending in the length direction of a middle frame, and thus preventing the flexible circuit board from interfering with other structures on the middle frame.

Description

Fingerprint recognition device and electronic device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on December 12, 2023, with application number 202311703723.3 and application name “Fingerprint Recognition Device and Electronic Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The embodiments of the present application relate to the technical field of electronic devices, and more particularly to a fingerprint recognition device and an electronic device. Background Art

[0003] The midframe of electronic devices (such as mobile phones and tablets) is typically equipped with a fingerprint recognition device. The device's flexible printed circuit board (FPCB) extends along the length of the midframe, and one end of the FPCB connects to the electronic device's mainboard, establishing a connection between the device and the motherboard. Because the FPCB extends along the length of the midframe, it can easily interfere with other structures on the midframe, such as antennas.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a fingerprint recognition device and an electronic device, which are intended to prevent interference between a flexible circuit board and other structures on a middle frame.

[0006] In a first aspect, an embodiment of the present application provides a fingerprint recognition device, comprising: a fingerprint recognition module, a flexible circuit board, and a fixing frame, wherein one end of the flexible circuit board is connected to the fingerprint recognition module; the fixing frame is arranged on the back side of the fingerprint recognition module, and the fixing frame is connected to the fingerprint recognition module; a portion of the flexible circuit board is wound around the mounting surface of the fixing frame facing away from the fingerprint recognition module.

[0007] Through the above setting, the fixing bracket is set on the back of the fingerprint recognition module, the fixing bracket is connected to the fingerprint recognition module, one end of the flexible circuit board is connected to the fingerprint recognition module, and part of the flexible circuit board is wound to the installation surface of the fixing bracket away from the fingerprint recognition module, so that the flexible circuit board is wound to the back of the fingerprint recognition module, thereby avoiding the flexible circuit board from extending along the length direction of the middle frame, and thus avoiding interference between the flexible circuit board and other structures on the middle frame.

[0008] In some embodiments that may include the above embodiments, the flexible circuit board includes a first plate and a second plate, the first plate covering one end of the fixing frame along the length direction, and the second plate covering the mounting surface; one end of the first plate is connected to the fingerprint recognition module, and the other end of the first plate is connected to one end of the second plate. Through this arrangement, the surface of the fixing frame where the flexible circuit board is located is parallel to the thickness direction of the fixing frame. The flexible circuit board does not increase the size of the fingerprint recognition device along the thickness direction of the electronic device, thereby facilitating a reduction in the thickness of the electronic device.

[0009] In some embodiments that may include the above embodiments, the flexible circuit board further includes a third plate, the third plate being located between the fingerprint recognition module and the fixing frame, one end of the third plate being connected to the fingerprint recognition module, and the other end of the third plate being connected to one end of the first plate. With this arrangement, while the first plate is electrically connected to the fingerprint recognition module via the third plate, the third plate is sandwiched between the fingerprint recognition module and the fixing frame, thereby securing the flexible circuit board and preventing the first plate from separating from the fingerprint recognition module during transportation or assembly.

[0010] In an implementation where the fingerprint recognition module includes a substrate and a fingerprint sensor disposed on the substrate, a soldering pad is disposed on the substrate, the fingerprint sensor is electrically connected to the soldering pad, and one end of the third plate is soldered to the soldering pad to thereby achieve an electrical connection between the third plate and the fingerprint sensor. It is understood that when the distance between the soldering pad and the first plate is relatively large, the electrical connection between the first plate and the fingerprint sensor can be achieved by disposing the third plate. When the distance between the soldering pad and the first plate is relatively close, the first plate can be directly connected to the soldering pad to reduce the length of the flexible circuit board. Accordingly, the substrate can be directly connected to the fixing frame.

[0011] In some embodiments that may include the above embodiments, a first adhesive layer is provided between the second board and the mounting surface, and the second board and the mounting surface are connected via the first adhesive layer. With this arrangement, the first adhesive layer secures the second board to the mounting surface, preventing the second board from moving relative to the mounting surface during use or assembly, and preventing contact between the flexible printed circuit board and other components within the electronic device.

[0012] In some embodiments that may include the above-described embodiments, a second adhesive layer is provided between the first plate and one end of the mounting bracket along the length direction, and the first plate and one end of the mounting bracket are connected along the length direction via the second adhesive layer. Through this arrangement, the second adhesive layer secures the first plate to the mounting bracket, preventing the first plate from moving relative to the fingerprint recognition module and, consequently, preventing the first plate from separating from the fingerprint recognition module. Furthermore, the second adhesive layer prevents the first plate from contacting the mounting bracket with sharp corners on the mounting bracket from damaging the flexible printed circuit board.

[0013] It is understandable that the corners where the fixing frame contacts the flexible circuit board may all be provided with chamfers or rounded corners to further prevent the corners from damaging the flexible circuit board.

[0014] In some embodiments that may include the above embodiments, a third adhesive layer is provided between the third plate and the fingerprint recognition module, and the third plate is connected to the fingerprint recognition module via the third adhesive layer; a fourth adhesive layer is provided between the third plate and the fixing frame, and the third plate is connected to the fixing frame via the fourth adhesive layer. In this arrangement, the fixing frame and the fingerprint recognition module are fixed together by the third adhesive layer, the third plate, and the fourth adhesive layer, eliminating the need for other fixing structures, thereby simplifying the structure of the fingerprint recognition device.

[0015] In some embodiments that may include the above embodiments, the fixing frame includes a frame body and a fixing plate, the frame body being connected to the fingerprint recognition module, the fixing plate being disposed on a side of the frame body facing away from the fingerprint recognition module, and the mounting surface including a surface of the fixing plate facing away from the fingerprint recognition module. Because the mounting surface is connected to the flexible printed circuit board, the machining accuracy (e.g., surface roughness, flatness, etc.) of the mounting surface is relatively high. Disposing the mounting surface on the fixing plate can reduce the difficulty of machining the frame body.

[0016] In some embodiments, which may include the above-mentioned embodiments, a mounting groove is provided on the surface of the frame facing away from the fingerprint recognition module, and at least a portion of the fixing plate is disposed within the mounting groove. This arrangement prevents the fixing plate from occupying space, thereby reducing the size of the fingerprint recognition device and facilitating miniaturization of the electronic device. It is understood that the fixing plate can be completely contained within the mounting groove, with the corresponding mounting surface being flush with the surface of the frame facing away from the fingerprint recognition module. Of course, the fixing plate can also be partially located within the mounting groove, that is, the mounting surface can protrude from the surface of the frame facing away from the fingerprint recognition module.

[0017] In some embodiments that may include the above embodiments, the mounting slot includes a first slot wall and a second slot wall disposed opposite each other, the first slot wall having a first notch and the second slot wall having a second notch; the fixing plate includes a first protrusion and a second protrusion, the first protrusion being disposed within the first notch and the second protrusion being disposed within the second notch. The first and second protrusions can restrict the position of the fixing plate within the mounting slot, thereby improving the positioning accuracy of the fixing plate.

[0018] In some embodiments that may include the above embodiments, a fifth adhesive layer is provided between the fixing plate and the frame, and the fixing plate is connected to the frame via the fifth adhesive layer. In this configuration, the fixing plate is fixed to the frame via the fifth adhesive layer, which simplifies the structure and facilitates connection.

[0019] In some embodiments that may include the above embodiments, the fingerprint recognition device also includes a supporting plate, and the fingerprint recognition device also includes a supporting plate, and a portion of the flexible circuit board is clamped between the mounting surface and the supporting plate; the supporting plate is arranged parallel to the mounting surface, and the surface of the supporting plate facing away from the mounting surface is used to support the fingerprint button on the electronic device.

[0020] With this arrangement, the fingerprint recognition device presses against the fingerprint button on the electronic device through the pressing plate, thereby increasing the contact area between the fingerprint recognition device and the fingerprint button; when the position deviation between the fingerprint recognition device and the fingerprint button is large due to factors such as assembly tolerance, it can still ensure complete contact between the pressing plate and the fingerprint button, that is, absorb the assembly tolerance of the electronic device, while also ensuring the pressing feel of the fingerprint button.

[0021] In some embodiments that may include the above embodiments, a sixth adhesive layer is provided between the top plate and the flexible printed circuit board on the side of the mounting frame facing away from the fingerprint recognition module, and the top plate is connected to the flexible printed circuit board via the sixth adhesive layer. The sixth adhesive layer secures the top plate to the flexible printed circuit board, thereby further connecting the top plate to the mounting frame, resulting in a simple structure and convenient connection.

[0022] In some embodiments that may include the above embodiments, a first fixing portion is provided on the fixing bracket, and the first fixing portion is configured to connect to the middle frame of the electronic device. In this configuration, the first fixing portion can achieve a connection between the fixing bracket and the middle frame, thereby fixing the fingerprint recognition device to the middle frame.

[0023] In some embodiments that may include the above-mentioned embodiments, the first fixing portion includes a fixing hole, the center line of the fixing hole is parallel to the mounting surface and perpendicular to the length direction of the fixing frame; a fixing may be provided on the side panel of the middle frame, and the fixing post is passed through the fixing hole to achieve fixation of the fixing frame. It is understandable that a receiving groove is provided on the middle frame, and the receiving groove has an opening on the side facing the outside of the electronic device, the fingerprint recognition device is received in the receiving groove, and the fingerprint recognition module faces the opening; when the user performs fingerprint recognition, the finger can be placed close to the opening so that the finger is close to or in contact with the fingerprint recognition module. Exemplarily, the fixing post can be detachably connected to the middle frame. In this way, during installation, the fingerprint recognition device can be placed in the receiving groove first, and then the fixing post can be installed on the middle frame. At the same time, the fixing post is passed through the fixing hole.

[0024] In some embodiments that may include the above embodiments, the fixing bracket is further provided with a second fixing portion, which is spaced apart from the first fixing portion and is also configured to connect to the middle frame of the electronic device. With this arrangement, the fixing bracket is fixed simultaneously by the first and second fixing portions, which can improve the connection force between the fixing bracket and the middle frame, thereby preventing the fixing bracket from falling off.

[0025] In a second aspect, an embodiment of the present application further provides an electronic device, comprising: a middle frame and the fingerprint recognition device as described above, wherein a fixing bracket of the fingerprint recognition device is connected to the middle frame. In the electronic device provided by the embodiment of the present application, the fixing bracket of the fingerprint recognition device is disposed on the back of the fingerprint recognition module, the fixing bracket is connected to the fingerprint recognition module, one end of the flexible circuit board is connected to the fingerprint recognition module, and a portion of the flexible circuit board is wound around the mounting surface of the fixing bracket facing away from the fingerprint recognition module, thereby allowing the flexible circuit board to be wound around the back of the fingerprint recognition module, thereby preventing the flexible circuit board from extending along the length direction of the middle frame, and thereby preventing the flexible circuit board from interfering with other structures on the middle frame. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic structural diagram of an electronic device provided in an embodiment of the present application, which is a non-foldable electronic device;

[0027] FIG2 is a first structural diagram of a foldable electronic device provided in an embodiment of the present application;

[0028] FIG3 is a second structural diagram of a foldable electronic device provided in an embodiment of the present application;

[0029] FIG4 is a third structural diagram of an electronic device provided in an embodiment of the present application, which is a foldable electronic device;

[0030] FIG5 is a first structural diagram of a fingerprint recognition device in the related art;

[0031] FIG6 is a second structural diagram of a fingerprint recognition device in the related art;

[0032] FIG7 is a first structural diagram of a fingerprint recognition device provided in an embodiment of the present application;

[0033] FIG8 is an exploded view of a fingerprint recognition device provided in an embodiment of the present application;

[0034] FIG9 is a second structural diagram of a fingerprint recognition device provided in an embodiment of the present application;

[0035] FIG10 is an exploded view of a fixing frame in a fingerprint recognition device provided in an embodiment of the present application;

[0036] FIG11 is a schematic structural diagram of a fingerprint recognition device provided in an embodiment of the present application installed on a middle frame;

[0037] FIG12 is a cross-sectional view taken along line AA in FIG11 .

[0038] Explanation of reference numerals: 10: electronic device; 20: fingerprint recognition device; 101: receiving groove; 110: middle frame; 111: middle plate; 112: side plate; 113: main board; 114: battery; 115: antenna; 116: volume button; 117: first middle frame; 118: second middle frame; 119: hinge; 120: display panel; 121: flexible display panel; 130: back cover; 210: fingerprint recognition module; 211: substrate; 212: housing; 220: flexible circuit board; 222: first board; 223: second board; 224: connecting board; 225: Third plate; 230: Fixing frame; 231: Frame; 232: Fixing plate; 233: Mounting groove; 234: First notch; 235: Second notch; 236: First protrusion; 237: Second protrusion; 238: Fifth adhesive layer; 239: Mounting surface; 241: First adhesive layer; 242: Second adhesive layer; 243: Third adhesive layer; 244: Fourth adhesive layer; 245: Sixth adhesive layer; 250: Top plate; 251: Top column; 260: First fixing portion; 261: Fixing column; 262: Fixing groove; 270: Second fixing portion. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0040] In the following, the terms "first," "second," etc. are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the quantity of the technical features indicated. Therefore, a feature specified as "first," "second," etc. may explicitly or implicitly include one or more of the features.

[0041] In addition, in the embodiments of the present application, directional terms such as "up", "down", "left", "right", "horizontal" and "vertical" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they can change accordingly according to changes in the orientation of the components in the drawings.

[0042] In the embodiments of the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, an electrical connection, a detachable connection, or an integrated connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0043] Please refer to Figure 1. An embodiment of the present application provides an electronic device 10. The electronic device 10 may include a mobile phone, a tablet computer, a smart bracelet, a smart watch, AR, VR, etc. The embodiment of the present application does not limit the electronic device 10.

[0044] In an embodiment of the present application, the electronic device 10 may include a non-folding electronic device and a folding electronic device. In the implementation manner in which the electronic device 10 includes a non-folding electronic device, taking the electronic device 10 including a mobile phone as an example, the electronic device 10 includes a middle frame 110, a display panel 120 and a back cover 130. The middle frame 110 includes a middle plate 111 and side plates 112 arranged around the periphery of the middle plate 111. The side plates 112 and the middle plate 111 can be arranged roughly vertically or roughly parallel to each other. The display panel 120 covers one side of the middle plate 111 (the left side in Figure 1), and the back cover 130 covers the other side of the middle plate 111 (the right side in Figure 1).

[0045] In the above implementation, the electronic device 10 also includes a motherboard 113 and a battery 114. The motherboard 113 can be disposed on the middle plate 111 of the middle frame 110 and can control the electronic device 10. The battery 114 can be disposed between the back cover 130 and the middle plate 111 and connected to the middle plate 111 to secure the battery 114. In other implementations, the electronic device 10 can include a housing, and accordingly, the motherboard 113 and the battery 114 can both be disposed within the housing, which can secure the motherboard 113 and the battery 114.

[0046] Continuing with reference to FIG1 , in an embodiment of the present application, the electronic device 10 further includes a fingerprint recognition device 20, which is disposed on a side panel 112 and is connected to the side panel 112 to secure the fingerprint recognition device 20. The fingerprint recognition device 20 is also electrically connected to the mainboard 113, so that fingerprint detection can be achieved through the fingerprint recognition device 20 under the control of the mainboard 113. For example, when a user's finger approaches or covers the fingerprint recognition device 20, the user's fingerprint information can be detected, thereby enabling functions such as unlocking the electronic device 10 and making mobile payments, thereby improving the user experience. In an implementation in which the electronic device 10 includes a housing, the fingerprint recognition device 20 can also be provided on the housing.

[0047] In some implementations, the side panel 112 is further provided with structures such as an antenna or a volume button 116, wherein the antenna is connected to the main board 113, so that the electronic device 10 can transmit signals to the outside or receive external signals through the antenna to achieve communication; a volume button is provided on the main board 113, and the volume button 116 corresponds to the volume button. When the user presses the volume button, the volume button 116 touches the volume button to adjust the volume of the electronic device 10.

[0048] As shown in FIG2 , in other embodiments, the electronic device 10 may include a foldable electronic device. Accordingly, the electronic device 10 may include a foldable mobile phone or a foldable tablet computer. The foldable electronic device includes a middle frame 110 and a hinge 119, wherein the middle frame 110 includes a first middle frame 117 and a second middle frame 118. The first middle frame 117 may include a first middle plate and a first side plate surrounding the periphery of the first middle plate; the second middle frame 118 may include a second middle plate and a second side plate surrounding the periphery of the second middle plate. The hinge 119 is disposed between the first middle frame 117 and the second middle frame 118, and the first middle frame 117 and the second middle frame 118 are connected by the hinge 119. The hinge 119 is configured to allow the first middle frame 117 to rotate relative to the second middle frame 118 to achieve folding or unfolding of the electronic device 10. Exemplarily, the hinge 119 can be connected to the first middle plate and / or the first side plate. Similarly, the hinge 119 can be connected to the second middle plate and / or the second side plate to achieve connection between the hinge 119 and the first middle frame 117 and the second middle frame 118.

[0049] The foldable electronic device also includes a flexible display panel 121, a mainboard, and a battery. The flexible display panel 121 covers the same side of the first middle frame 117 and the second middle frame 118. When the first middle frame 117 rotates relative to the second middle frame 118, the flexible display panel 121 can bend accordingly. The mainboard can be located on either the first or second middle board, and the mainboard 113 can be used to control the electronic device 10. The battery can be located on either the first or second middle board to secure the battery.

[0050] The foldable electronic device also includes a fingerprint recognition device 20, which is mounted on the first middle frame 117 or the second middle frame 118 to secure the device 20. The device 20 is also electrically connected to the mainboard, enabling fingerprint detection under the control of the mainboard. For example, when a user's finger approaches or covers the fingerprint recognition device 20, the device detects the user's fingerprint information, enabling functions such as unlocking the electronic device 10 and making mobile payments, thereby improving the user experience.

[0051] Continuing with FIG. 2 , it can be understood that when the first middle frame 117 and the second middle frame 118 are folded together, the flexible display panel 121 can be located outside the first middle frame 117 and the second middle frame 118. In other implementations, when the first middle frame 117 and the second middle frame 118 are folded together, the flexible display panel 121 can also be located inside the first middle frame 117 and the second middle frame 118, that is, the flexible display panel 121 is located between the first middle frame 117 and the second middle frame 118. This embodiment of the present application is not limited to this.

[0052] As shown in FIG2 , in some implementations, the foldable electronic device can be folded horizontally. Of course, as shown in FIG3 , the foldable electronic device can also be folded vertically, which is not limited in this embodiment of the present application.

[0053] Please refer to Figure 4. In some embodiments, the first middle frame 117 or the second middle frame 118 is further provided with an antenna 115 or a volume button and other structures, wherein the antenna 115 is connected to the mainboard, so that the electronic device 10 can transmit signals to the outside or receive external signals through the antenna 115 to achieve communication; a volume button is provided on the mainboard 113, and the volume button corresponds to the volume button. When the user presses the volume button, the volume button touches the volume button to adjust the volume of the electronic device 10.

[0054] Please refer to Figures 5 and 6. In the related art, the fingerprint recognition device 20 includes a flexible circuit board 220, a fixing frame 230 and a fingerprint recognition module 210, wherein the flexible circuit board 220 is clamped between the fixing frame 230 and the fingerprint recognition module 210. The flexible circuit board 220 extends a certain distance along the length direction of the fixing frame 230 (the vertical direction in Figures 5 and 6) and then extends into the electronic device to connect with the motherboard. The length of the flexible circuit board 220 extending along the length direction of the fixing frame 230 is long, which is easy to interfere with structures such as the volume button and antenna on the middle frame.

[0055] Continuing with Figures 5 and 6, a support post 251 is provided at one end of the mounting bracket 230, facing away from the fingerprint recognition module 210. Support post 251 extends toward the interior of the electronic device. When a user presses the fingerprint recognition module 210, the fingerprint recognition module 210 moves toward the interior of the electronic device, causing support post 251 to contact the fingerprint button, thereby triggering the fingerprint button. With support post 251 contacting the fingerprint button, the contact area between support post 251 and the fingerprint button is small. If factors such as assembly tolerances cause positional deviation between the fingerprint recognition device 20 and the fingerprint button, support post 251 may struggle to contact the fingerprint button, or may partially contact the fingerprint button, making assembly of the electronic device 10 more difficult. Furthermore, if part of support post 251 contacts the fingerprint button, when the user presses the fingerprint recognition module 210, the reaction force fed back from the fingerprint button to support post 251 may be offset, thereby affecting the pressing feel and resulting in a poor user experience.

[0056] Referring to Figures 7 and 8 , an electronic device 10 provided in an embodiment of the present application includes a fingerprint recognition device 20, which includes a fingerprint recognition module 210, wherein the fingerprint recognition module 210 is used to detect a user's fingerprint information. Exemplarily, the fingerprint recognition module 210 may include a substrate 211 and a fingerprint sensor disposed on the substrate 211. The fingerprint sensor may include an optical fingerprint sensor, a semiconductor capacitive sensor, a semiconductor thermistor sensor, a semiconductor pressure sensor, an ultrasonic sensor, an RF sensor, etc. The embodiment of the present application does not impose any restrictions on this, as long as the fingerprint sensor can detect the user's fingerprint information.

[0057] In the above implementation, the fingerprint recognition module 210 further includes a housing 212, which is mounted on the substrate 211. The housing 212 and the substrate 211 can be arranged to form a mounting cavity, in which the fingerprint sensor is housed. The housing 212 includes a detection plane (the left plane in FIG. 7 ) that is parallel to and spaced apart from the substrate 211. The fingerprint sensor is positioned opposite the detection plane. When a user's finger approaches or touches the detection plane, the fingerprint sensor can detect the user's fingerprint information. This arrangement protects the fingerprint sensor through the housing 212, preventing damage to the fingerprint sensor and extending the service life of the fingerprint recognition module 210.

[0058] In the embodiment of the present application, the fingerprint recognition device 20 further includes a flexible circuit board 220 and a fixing bracket 230. The fixing bracket 230 is located on the back side of the fingerprint recognition module 210, where the back side may be the surface opposite the detection plane. For example, the back side may be the plane of the substrate 211 facing away from the fingerprint sensor. The fixing bracket 230 is connected to the fingerprint recognition module 210 and is configured to connect to the middle frame 110 (as shown in FIG. 1 ) in the above embodiment. Accordingly, the fixing bracket 230 can be used to fix the fingerprint recognition module 210 to the middle frame 110 of the electronic device 10, thereby achieving the fixation of the fingerprint recognition device 20. One end of the flexible circuit board 220 is connected to the fingerprint recognition module 210, and the other end of the flexible circuit board 220 is configured to connect to the mainboard 113 of the electronic device 10, thereby achieving electrical connection between the fingerprint recognition module 210 and the mainboard 113. Signal transmission between the fingerprint recognition module 210 and the mainboard 113 can be achieved through the flexible circuit board 220.

[0059] Continuing with Figures 7 and 8 , in the above implementation, the mounting bracket 230 has a mounting surface 239 facing away from the fingerprint recognition module 210. This mounting surface 239 can be arranged parallel to the substrate 211. Alternatively, this mounting surface 239 can have a smaller angle (e.g., 0°-15°) with the substrate 211. A portion of the flexible printed circuit board 220 is wound around the mounting surface 239. After being wound around the mounting surface 239, the flexible printed circuit board 220 is connected to the mainboard 113.

[0060] It can be understood that the length direction of the fixing frame 230 (Z direction in Figure 7) is approximately the same as the length direction of the side plate 112, that is, the length direction of the fixing frame 230 is approximately parallel to the length direction of the side plate 112, the width direction of the fixing frame 230 (X direction in Figure 7) is approximately perpendicular to the length direction of the side plate 112 and is approximately parallel to the middle plate 111, and the thickness direction of the fixing frame 230 (Y direction in Figure 7) is perpendicular to the middle plate 111, that is, the thickness direction of the fixing frame 230 is the same as the thickness direction of the electronic device 10.

[0061] Continuing with reference to Figures 7 and 8, in some implementations, the flexible circuit board 220 may cover one end of the fixing plate 232 along the length direction before covering the mounting surface 239. Exemplarily, the flexible circuit board 220 may include a first plate 222 and a second plate 223, which are sequentially arranged along the length direction of the flexible circuit board 220. The first plate 222 covers one end of the fixing plate 230 along the length direction, and the second plate 223 covers the mounting surface 239, thereby allowing a portion of the flexible circuit board 220 to be wound around the mounting surface 239. One end of the first plate 222 is connected to the fingerprint recognition module 210, and the other end of the first plate 222 is connected to one end of the second plate 223. The other end of the second plate 223 is configured to connect to the mainboard 113 (as shown in Figure 1), thereby achieving an electrical connection between the fingerprint recognition module 210 and the mainboard 113 through the first plate 222 and the second plate 223.

[0062] It is understandable that the first plate 222 and the second plate 223 may be two parts of the same flexible circuit board 220 along the length direction, that is, the first plate 222 and the second plate 223 may be formed by bending the same flexible circuit board 220 .

[0063] Among them, the end of the second plate body 223 facing away from the first plate body 222 is connected to the main board 113 to realize the electrical connection between the fingerprint recognition module 210 and the main board 113. Exemplarily, the flexible circuit board 220 may further include a connecting plate 224, one end of which is connected to the end of the second plate body 223, and the other end of the connecting plate 224 extends toward the interior of the electronic device 10 (as shown in Figure 1) and is further connected to the main board 113. In this embodiment of the application, there is no limitation on the shape of the connecting plate 224, as long as it can realize the connection between the second plate body 223 and the main board 113. Exemplarily, the connecting plate 224 can be straight. Of course, the connecting plate 224 can also be curved or bent, and this embodiment of the application does not limit this.

[0064] Through the above configuration, the surface of the fixing frame 230 where the flexible circuit board 220 is located is parallel to the thickness direction of the fixing frame 230. The flexible circuit board 220 does not increase the size of the fingerprint recognition device 20 along the thickness direction of the electronic device 10, thereby facilitating a reduction in the thickness of the electronic device 10.

[0065] Continuing with Figures 7 and 8 , in the above-described implementation, the flexible circuit board 220 further includes a third plate 225, which is positioned between the fingerprint recognition module 210 and the mounting bracket 230. One end of the third plate 225 is connected to the fingerprint recognition module 210, and the other end of the third plate 225 is connected to one end of the first plate 222. With this arrangement, while the first plate 222 is electrically connected to the fingerprint recognition module 210 via the third plate 225, the third plate 225 is sandwiched between the fingerprint recognition module 210 and the mounting bracket 230, thereby securing the flexible circuit board 220 and preventing the first plate 222 from separating from the fingerprint recognition module 210 during transportation or assembly.

[0066] Exemplarily, the first plate 222 , the second plate 223 and the third plate 225 may be three parts of the same flexible circuit board 220 along the length direction, that is, the same flexible circuit board 220 is bent to form the first plate 222 , the second plate 223 and the third plate 225 .

[0067] Continuing with reference to Figures 7 and 8, in an implementation in which the fingerprint recognition module 210 includes a substrate 211 and a fingerprint sensor disposed on the substrate 211, a soldering pad is disposed on the substrate 211, the fingerprint sensor is electrically connected to the soldering pad, and one end of the third plate 225 is soldered to the soldering pad, thereby achieving an electrical connection between the third plate 225 and the fingerprint sensor. It is understood that when the distance between the soldering pad and the first plate 222 is relatively far, the electrical connection between the first plate 222 and the fingerprint sensor can be achieved by providing the third plate 225. As shown in Figure 9, when the distance between the soldering pad and the first plate 222 is relatively close, the first plate 222 can be directly connected to the soldering pad to reduce the length of the flexible circuit board 220. Accordingly, the substrate 211 can be directly connected to the fixing frame 230.

[0068] 7 and 8 , in the fingerprint recognition device 20 provided in the embodiment of the present application, the fixing frame 230 is arranged on the back of the fingerprint recognition module 210, the fixing frame 230 is connected to the fingerprint recognition module 210, one end of the flexible circuit board 220 is connected to the fingerprint recognition module 210, and a portion of the flexible circuit board 220 is wound around the mounting surface 239 of the fixing frame 230 away from the fingerprint recognition module 210, thereby allowing the flexible circuit board 220 to be wound around the back of the fingerprint recognition module 210, preventing the flexible circuit board 220 from extending along the length direction of the middle frame 110, thereby preventing the flexible circuit board 220 from interfering with other structures on the middle frame 110.

[0069] Continuing with FIG7 and FIG8 , in an implementation where the flexible circuit board 220 covers one end of the fixing plate 232 along the length direction and then covers the mounting surface 239, a first adhesive layer 241 is provided between the second plate body 223 and the mounting surface 239, connecting the second plate body 223 and the mounting surface 239 via the first adhesive layer 241. Exemplarily, the material of the first adhesive layer 241 may include double-sided tape, thermosetting adhesive, or other materials capable of securing the second plate body 223 to the mounting surface 239. The present embodiment of the present application does not limit the material of the first adhesive layer 241.

[0070] Through the above arrangement, the first adhesive layer 241 fixes the second board 223 on the mounting surface 239 , thereby preventing the second board 223 from moving relative to the mounting surface 239 during use or assembly, and preventing contact between the flexible circuit board 220 and other components in the electronic device 10 .

[0071] In the above implementation, a second adhesive layer 242 is disposed between the first plate 222 and one end of the fixing frame 230 along the length direction, and the first plate 222 and one end of the fixing frame 230 along the length direction are connected via the second adhesive layer 242. For example, the material of the second adhesive layer 242 can be the same as or different from the material of the first adhesive layer 241. The present embodiment does not impose any restrictions on the material of the second adhesive layer 242, as long as it can fix the first plate 222 to the fixing frame 230.

[0072] Through the above arrangement, the second adhesive layer 242 secures the first board 222 to the fixing frame 230, preventing the first board 222 from moving relative to the fingerprint recognition module 210 and, in turn, preventing the first board 222 from separating from the fingerprint recognition module 210. Furthermore, the first board 222 is in contact with the fixing frame 230 via the second adhesive layer 242, preventing sharp corners on the fixing frame 230 from damaging the flexible printed circuit board 220.

[0073] It is understood that the corners where the fixing bracket 230 contacts the flexible circuit board 220 may be chamfered or rounded to further prevent damage to the flexible circuit board 220. For example, chamfers or rounded corners are provided between one end of the fixing bracket 230 along the length direction and the mounting surface 239, and between one end of the fixing bracket 230 along the length direction and the surface of the fixing bracket 230 facing the fingerprint recognition module 210.

[0074] In an implementation where the flexible circuit board 220 includes a third plate 225, a third adhesive layer 243 is provided between the third plate 225 and the fingerprint recognition module 210, connecting the third plate 225 to the fingerprint recognition module 210 via the third adhesive layer 243. A fourth adhesive layer 244 is provided between the third plate 225 and the mounting bracket 230, connecting the third plate 225 to the mounting bracket 230 via the fourth adhesive layer 244. This arrangement secures the mounting bracket 230 to the fingerprint recognition module 210 via the third adhesive layer 243, the third plate 225, and the fourth adhesive layer 244, eliminating the need for additional securing structures and simplifying the structure of the fingerprint recognition device 20.

[0075] It is understandable that the material of the third adhesive layer 243 and the fourth adhesive layer 244 may be the same as or different from the material of the first adhesive layer 241 , and the embodiment of the present application does not limit the material of the third adhesive layer 243 and the fourth adhesive layer 244 .

[0076] In some embodiments, the fixing frame 230 can be an integrated structure, and accordingly, the mounting surface 239 is a surface of the fixing frame 230 facing away from the fingerprint recognition module 210. Referring to FIG10 , in other embodiments, the fixing frame 230 can include a frame body 231 and a fixing plate 232. The frame body 231 is connected to the fingerprint recognition module 210 (as shown in FIG8 ), and the fixing plate 232 is disposed on a side of the frame body 231 facing away from the fingerprint recognition module 210. The fixing plate 232 is connected to the frame body 231, and the mounting surface 239 comprises a surface of the fixing plate 232 facing away from the fingerprint recognition module 210. Because the mounting surface 239 is connected to the flexible printed circuit board 220, the machining accuracy (e.g., surface roughness, flatness, etc.) of the mounting surface 239 is higher. Disposing the mounting surface 239 on the fixing plate 232 can reduce the machining difficulty of the frame body 231.

[0077] For example, the frame 231 can be roughly rectangular, and accordingly, the first plate 222 can cover the smaller end surface of the frame 231, and the fixing plate 232 can be installed on the surface adjacent to the end surface. Of course, the frame 231 can also have other shapes, and the embodiment of the present application does not limit the shape of the frame 231.

[0078] Continuing with FIG. 10 , in the above-described implementation, a mounting groove 233 is provided on the surface of the frame 231 facing away from the fingerprint recognition module 210, and at least a portion of the fixing plate 232 is disposed within the mounting groove 233. This arrangement prevents the fixing plate 232 from occupying space, thereby reducing the size of the fingerprint recognition device 20 and facilitating miniaturization of the electronic device 10. It is understood that the fixing plate 232 can be completely contained within the mounting groove 233, with the corresponding mounting surface 239 being flush with the surface of the frame 231 facing away from the fingerprint recognition module 210. Of course, the fixing plate 232 can also be partially located within the mounting groove 233, that is, the mounting surface 239 can protrude from the surface of the frame 231 facing away from the fingerprint recognition module 210.

[0079] In some embodiments, the mounting groove 233 includes a first groove wall and a second groove wall disposed opposite each other. The first groove wall is provided with a first notch 234, and the second groove wall is provided with a second notch 235. The fixing plate 232 is provided with a first protrusion 236 and a second protrusion 237. The first protrusion 236 is disposed within the first notch 234, and the second protrusion 237 is disposed within the second notch 235. The first protrusion 236 and the second protrusion 237 can restrict the position of the fixing plate 232 within the mounting groove 233, thereby improving the positioning accuracy of the fixing plate 232.

[0080] In the above implementation, a fifth adhesive layer 238 is disposed between the fixing plate 232 and the frame 231, connecting the fixing plate 232 to the frame 231 via the fifth adhesive layer 238. This arrangement allows the fixing plate 232 to be secured to the frame 231 via the fifth adhesive layer 238, resulting in a simple structure and convenient connection. In implementations where at least a portion of the fixing plate 232 is located within the mounting groove 233, the fifth adhesive layer 238 is located between the bottom of the mounting groove 233 and the fixing plate 232, securing the fixing plate 232 to the frame 231.

[0081] Of course, in other implementations, the fixing plate 232 and the frame 231 may also be connected by welding or bolting, and the embodiment of the present application does not limit this, as long as the fixing plate 232 can be fixed to the frame 231.

[0082] Continuing with Figures 7 and 8 , in the embodiment of the present application, the fingerprint recognition device 20 further includes a supporting plate 250. A portion of the flexible circuit board 220 is sandwiched between the mounting surface 239 and the supporting plate 250. Specifically, the supporting plate 250 is disposed on the side of the flexible circuit board 220 on the mounting surface 239 facing away from the fingerprint recognition module 210. The supporting plate 250 can be connected to the flexible circuit board 220 on the mounting surface 239. The supporting plate 250 is disposed parallel to the mounting surface 239, and the surface of the supporting plate 250 facing away from the mounting surface 239 is used to support the fingerprint button on the electronic device 10. Compared with the related technologies shown in Figures 5 and 6, through the above-mentioned arrangement, the fingerprint recognition device 20 presses against the fingerprint button on the electronic device 10 through the pressing plate 250, thereby increasing the contact area between the fingerprint recognition device 20 and the fingerprint button; when the position deviation between the fingerprint recognition device 20 and the fingerprint button is large due to factors such as assembly tolerance, it is still possible to ensure complete contact between the pressing plate 250 and the fingerprint button, that is, to absorb the assembly tolerance of the electronic device 10, reduce the difficulty of assembling the electronic device 10, and at the same time ensure the pressing feel of the fingerprint button.

[0083] It is understood that the fingerprint button is disposed on the mainboard 113 shown in FIG1 and is electrically connected to the mainboard 113. When a user presses the fingerprint recognition module 210, the fingerprint recognition module 210 moves toward the interior of the electronic device 10, thereby causing the abutment plate 250 to abut the fingerprint button, thereby triggering the fingerprint button. The fingerprint button may include any one of the home button, mute button, etc. of the electronic device 10. The present embodiment does not limit the function of the fingerprint button.

[0084] In the above implementation, a sixth adhesive layer 245 is disposed between the top plate 250 and the flexible circuit board 220 on the side of the mounting bracket 230 facing away from the fingerprint recognition module 210. The top plate 250 is connected to the flexible circuit board 220 via the sixth adhesive layer 245. The sixth adhesive layer 245 secures the top plate 250 to the flexible circuit board 220, thereby further connecting the top plate 250 to the mounting bracket 230. This structure is simple and convenient. The material of the sixth adhesive layer 245 can be the same as that of the first adhesive layer 241, and this embodiment of the present application does not impose any restrictions on the material of the sixth adhesive layer 245.

[0085] Referring to Figures 11 and 12 , in the embodiment of the present application, a first fixing portion 260 is provided on the fixing frame 230. The first fixing portion 260 is configured to connect to the middle frame 110 of the electronic device. With this arrangement, the first fixing portion 260 enables connection between the fixing frame 230 and the middle frame 110, thereby securing the fingerprint recognition device 20 to the middle frame 110.

[0086] In some implementations, the first fixing portion 260 includes a fixing hole, the centerline of which is parallel to the mounting surface 239 shown in FIG8 and perpendicular to the length of the fixing frame 230; that is, the centerline of the fixing hole is perpendicular to the middle plate 111 of the middle frame 110 shown in FIG1. ​​Accordingly, the side plates 112 of the middle frame 110 may be provided with fixing posts 261, which pass through the fixing holes to secure the fixing frame 230.

[0087] It is understood that the middle frame 110 is provided with a receiving groove 101, which has an opening on the side facing the outside of the electronic device. The fingerprint recognition device 20 is accommodated in the receiving groove 101, and the fingerprint recognition module 210 faces the opening. When the user performs fingerprint recognition, the user can place a finger close to the opening so that the finger is close to or in contact with the fingerprint recognition module 210. Exemplarily, the fixing post 261 can be detachably connected to the middle frame 110. In this way, during installation, the fingerprint recognition device 20 can be placed in the receiving groove 101 first, and then the fixing post 261 can be installed on the middle frame 110. At the same time, the fixing post 261 is inserted into the fixing hole.

[0088] In an implementation where a fingerprint button is provided on the motherboard, a portion of the fingerprint recognition module 210 can protrude from the opening to facilitate the user's pressing of the fingerprint recognition module 210. When the user presses the fingerprint recognition module 210, the fixing frame 230 is squeezed by the fingerprint recognition module 210 and moves toward the interior of the electronic device, thereby causing the top plate 250 to contact the fingerprint button, thereby triggering the fingerprint button. The width of the fixing post 261 along the direction of movement of the fixing frame 230 (horizontally in FIG. 12 ) is smaller than the width of the fixing hole to prevent the fixing post 261 from blocking the movement of the fixing frame 230.

[0089] In other implementations, the first fixing portion 260 may include a fixing column arranged on the fixing frame 230. Accordingly, a fixing hole is provided on the side plate 112 of the middle frame 110, and the fixing column is passed through the fixing hole, which can also achieve the fixation of the fixing frame 230. The embodiment of the present application does not limit the structure of the first fixing portion 260, as long as it can achieve the fixation of the fixing frame 230.

[0090] Continuing with Figures 11 and 12, in some embodiments, the fixing frame 230 is further provided with a second fixing portion 270, which is spaced apart from the first fixing portion 260 and is also configured to connect to the middle frame 110 of the electronic device. This arrangement allows the first fixing portion 260 and the second fixing portion 270 to simultaneously secure the fixing frame 230, thereby increasing the connection force between the fixing frame 230 and the middle frame 110 and preventing the fixing frame 230 from falling off.

[0091] For example, the first fixing portion 260 may be located near one end of the fixing frame 230 along the length direction, and the second fixing portion 270 may include a protrusion located at one end of the fixing frame 230 along the length direction. Accordingly, a fixing groove 262 is provided on the wall of the accommodating groove 101, and the protrusion is locked in the fixing groove 262. Of course, in other implementations, the second fixing portion 260 may include a through hole provided on the fixing frame 230, the center line of the through hole may be perpendicular to the center line of the fixing hole, and the center line of the through hole is parallel to the movement direction of the fingerprint recognition device 20. Accordingly, a column is provided on the middle frame 110, and the column passes through the through hole.

[0092] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0093] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A fingerprint recognition device, characterized in that: include: Fingerprint recognition module; A flexible circuit board, one end of which is connected to the fingerprint recognition module; A fixing frame is arranged on the back of the fingerprint recognition module and is connected to the fingerprint recognition module; a part of the flexible circuit board is wound around the installation surface of the fixing frame away from the fingerprint recognition module.

2. The fingerprint recognition device according to claim 1, characterized in that: The flexible circuit board includes a first plate body and a second plate body, the first plate body covers one end of the fixing frame along the length direction, and the second plate body covers the mounting surface; one end of the first plate body is connected to the fingerprint recognition module, and the other end of the first plate body is connected to one end of the second plate body.

3. The fingerprint recognition device according to claim 1, characterized in that: The flexible circuit board includes a first board, a second board and a third board, the first board covers one end of the fixing frame along the length direction, the second board covers the mounting surface, the third board is located between the fingerprint recognition module and the fixing frame, one end of the third board is connected to the fingerprint recognition module, the other end of the third board is connected to one end of the first board, and the other end of the first board is connected to one end of the second board.

4. The fingerprint recognition device according to claim 2 or 3, characterized in that: A first adhesive layer is disposed between the second plate body and the mounting surface, and the second plate body and the mounting surface are connected via the first adhesive layer.

5. The fingerprint recognition device according to any one of claims 2 to 4, characterized in that: A second adhesive layer is provided between the first plate body and one end of the fixing frame along the length direction, and the first plate body and one end of the fixing frame along the length direction are connected via the second adhesive layer.

6. The fingerprint recognition device according to claim 3, characterized in that: A third adhesive layer is provided between the third plate and the fingerprint recognition module, and the third plate is connected to the fingerprint recognition module through the third adhesive layer; a fourth adhesive layer is provided between the third plate and the fixing frame, and the third plate is connected to the fixing frame through the fourth adhesive layer.

7. The fingerprint recognition device according to any one of claims 1 to 6, characterized in that: The fixing frame includes a frame body and a fixing plate, the frame body is connected to the fingerprint recognition module, the fixing plate is arranged on a side of the frame body away from the fingerprint recognition module, and the mounting surface includes a surface of the fixing plate away from the fingerprint recognition module.

8. The fingerprint recognition device according to claim 7, characterized in that: A mounting groove is arranged on a surface of the frame body away from the fingerprint identification module, and at least a part of the fixing plate is arranged in the mounting groove.

9. The fingerprint recognition device according to claim 8, characterized in that: The mounting groove comprises a first groove wall and a second groove wall arranged opposite to each other, the first groove wall is provided with a first notch, and the second groove wall is provided with a second notch; the fixing plate is provided with a first protrusion and a second protrusion, the first protrusion is arranged in the first notch, and the second protrusion is arranged in the second notch.

10. The fingerprint recognition device according to any one of claims 7 to 9, characterized in that: A fifth adhesive layer is provided between the fixing plate and the frame, and the fixing plate is connected to the frame through the fifth adhesive layer.

11. The fingerprint recognition device according to any one of claims 1 to 10, characterized in that: The fingerprint recognition device also includes a resisting plate, and part of the flexible circuit board is clamped between the mounting surface and the resisting plate; the resisting plate is arranged parallel to the mounting surface, and the surface of the resisting plate facing away from the mounting surface is used to resist the fingerprint button on the electronic device.

12. The fingerprint recognition device according to claim 11, characterized in that: A sixth adhesive layer is provided between the abutting plate and the flexible circuit board on a side of the fixing frame away from the fingerprint identification module, and the abutting plate is connected to the flexible circuit board through the sixth adhesive layer.

13. The fingerprint recognition device according to any one of claims 1 to 12, characterized in that: The fixing frame is provided with a first fixing portion, and the first fixing portion is configured to be connected to the middle frame of the electronic device.

14. The fingerprint recognition device according to claim 13, characterized in that: The first fixing portion includes a fixing hole, a center line of which is parallel to the mounting surface and perpendicular to a length direction of the fixing frame.

15. The fingerprint recognition device according to claim 13 or 14, characterized in that: The fixing frame is also provided with a second fixing portion, the second fixing portion is spaced apart from the first fixing portion, and the second fixing portion is also configured to be connected to the middle frame of the electronic device.

16. An electronic device, characterized in that: include: A middle frame and the fingerprint recognition device according to any one of claims 1 to 15, wherein the fixing frame of the fingerprint recognition device is connected to the middle frame.

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