WO2022052726A1

WO2022052726A1 - Electronic device

Info

Publication number: WO2022052726A1
Application number: PCT/CN2021/112086
Authority: WO
Inventors: 田昂; 孙斌; 李琴琴; 汪晓永
Original assignee: 华为技术有限公司
Priority date: 2020-09-08
Filing date: 2021-08-11
Publication date: 2022-03-17
Also published as: CN112162594B; CN112162594A

Abstract

The present application provides an electronic device, comprising a display screen, a metal front housing, a non-metal rear housing, and a back cover. A fingerprint mounting hole is formed in a frame of the rear housing; two fixing columns are provided on the inner wall of the frame; the two fixing columns are respectively located at two sides of the fingerprint mounting hole in the length direction; a key switch is provided on a boss, facing the fingerprint mounting hole, of the front housing; a fingerprint recognition apparatus comprises a fingerprint module, a flexible circuit board, a reinforcing member, and an elastic member; the fingerprint module is provided in the fingerprint mounting hole, and the outer surface of the fingerprint module is exposed outside the fingerprint mounting hole; one end of the flexible circuit board is connected between the fingerprint module and the reinforcing member, and the other end is electrically connected to a master board; the elastic member is connected to the side of the reinforcing member facing the key switch; two ends of the elastic member are respectively provided with fixing parts; and the two fixing parts are respectively connected to the two fixing columns. The present application provides the electronic device, and thus the fingerprint recognition apparatus can be mounted on the side edge of the electronic device.

Description

Electronic equipment

This application claims the priority of the Chinese patent application with the application number 202010935261.8 and the application name "Electronic Equipment" filed with the China Patent Office on September 08, 2020, the entire contents of which are incorporated into this application by reference.

technical field

The present application relates to the technical field of electronic devices, and in particular, to an electronic device with a fingerprint identification device.

Background technique

The fingerprint recognition device is a pattern recognition system that includes modules such as fingerprint image acquisition, processing, feature extraction, and comparison. When the fingerprint recognition device is applied to electronic equipment, the fingerprint of the touch fingerprint recognition device can be compared with the pre-stored fingerprints. Compare to authenticate the user. The fingerprint identification device can generally be arranged on the front of the electronic device with the display screen. With the continuous popularization of the full screen, the fingerprint identification device installed on the side of the electronic device has been applied.

In the related art, for an electronic device using a structure of display screen + metal middle frame + back cover, a hole is opened on the metal middle frame, and the fingerprint identification device is installed in the hole, and the assembly process is very simple. However, for electronic devices with a structure of display screen + metal front shell + non-metal rear shell + back cover, if the fingerprint identification device is to be installed on the side of the electronic device, it is necessary to consider the fingerprint identification device and the front and rear shells. There is a big difference between the assembly method and the electronic equipment using the metal middle frame type, the structure design is more difficult, and the assembly difficulty is higher.

SUMMARY OF THE INVENTION

The present application provides an electronic device, in which a fingerprint identification device can be installed on the side of the electronic device.

The present application provides an electronic device, comprising a display screen, a metal front case, a non-metallic back case and a back cover, the display screen is connected to the front case, the front case and the back cover are respectively connected to two sides of the back case, the front case, the back cover The cover and the rear shell are surrounded by an accommodating space, and a main board and a fingerprint identification device are arranged in the accommodating space; a fingerprint mounting hole is arranged on the frame of the rear casing, and two fixing columns are arranged on the inner wall of the frame, and the two fixing columns are respectively Located on both sides of the fingerprint installation hole in the length direction, a key switch is arranged on the boss of the front shell facing the fingerprint installation hole, and the fingerprint identification device includes a fingerprint module, a flexible circuit board, a reinforcing member and an elastic member, and the fingerprint module It is arranged in the fingerprint installation hole and the outer surface of the fingerprint module is exposed outside the fingerprint installation hole. One end of the flexible circuit board is connected between the fingerprint module and the reinforcing member, and the other end of the flexible circuit board is electrically connected to the main board. The elastic member It is connected to the side of the reinforcing piece facing the key switch, the two ends of the elastic piece are respectively provided with fixing parts, and the two fixing parts are respectively connected to the two fixing columns.

The fingerprint identification device of the electronic device includes a fingerprint module, a flexible circuit board, a reinforcing member and an elastic member. The end is fixed on the fixing column in the rear shell to realize the pre-fixation between the fingerprint identification device and the rear shell. The elastic part has low cost, takes up less space, will not affect the structural strength of the front shell, and is less difficult to assemble with the rear shell. After the fingerprint identification device is pre-fixed to the rear shell, the rear shell is assembled to the front shell. The impact on the device is small, the device will not be damaged by bumping, and the reliability of the electronic device can be improved.

In a possible implementation, the flexible circuit board includes a first segment, a second segment, a third segment and a fourth segment connected in sequence, the first segment is located between the fingerprint module and the reinforcing member, and the second segment is located along the The third section extends along the side wall of the frame, the third section is located between the frame and the boss, the fourth section extends along the inner surface of the back cover, and the end of the fourth section is fastened to the motherboard through the connector.

The flexible circuit board continues to extend along the side wall of the frame from the connection point with the fingerprint module, and then passes through the boss of the front case, extends to the side of the front case facing the back cover, and is fastened on the main board, so as to realize The electrical connection between the fingerprint module and the motherboard.

In a possible implementation manner, a grounding area is provided on the flexible circuit board, and a conductive copper foil is exposed on the surface of the grounding area facing the front case, the front case is bonded with conductive foam through conductive glue, and the conductive foam is sandwiched between the ground area and the front case.

The exposed copper foil in the grounding area is connected to the front case through the conductive foam to realize the grounding. It can discharge static electricity without connecting the protective device with high cost, and it will not damage the device on the main board, and the safety is higher.

In a possible implementation manner, the grounding region is connected in the width direction of the third segment and is arranged close to the second segment, and an arc-shaped groove recessed toward the interior of the grounding region is provided at the connection between the grounding region and the third segment.

Setting a grounding area on the flexible circuit board closest to the front shell can realize the shortest path grounding of static electricity; setting an arc groove can play a role in releasing force, on the one hand, it can prevent the flexible circuit board from being torn under force, and on the other hand, it can Reduce the pulling force of the third section on the grounding area to prevent the grounding state of the grounding area from failing. On the other hand, it can reduce the pulling force of the third section on the second section, which can prevent the fingerprint module from being skewed.

In a possible implementation, a retaining wall is protruded from the inner wall of the frame, the surface of the retaining wall is parallel to the plane where the fingerprint module is located, and the second section is adhered to the retaining wall by adhesive.

In this way, on the one hand, it can ensure that the plane where the second section of the flexible circuit board is located is always parallel to the plane where the first section is located, preventing the skew of the second section from causing the fingerprint module to skew, and on the other hand, the second section can be reliably fixed on the On the rear shell, other parts of the flexible circuit board can be prevented from exerting a pulling force on the second segment, and the fingerprint module can be prevented from being skewed when the second segment is skewed by force.

In a possible implementation manner, the reinforcing member is provided as a metal member, and the reinforcing member is connected to the flexible circuit board through conductive glue.

The reinforcement is used to improve the overall structural strength of the fingerprint module. By electrically connecting the reinforcement to the flexible circuit board, the static electricity released from the outside to the reinforcement can be conducted to the flexible circuit board, and then grounded through the flexible circuit board. freed.

In a possible implementation, the inner wall of the frame is provided with a coplanar first limiting surface and a second limiting surface, and the first limiting surface and the second limiting surface are respectively located at the length direction of the fingerprint installation hole. On both sides, the reinforcing piece includes a metal piece main body and a limit part, the limit part is arranged at one end of the reinforcing piece close to the second section of the flexible circuit board, and the limit part is a protrusion on the wide sides of the metal piece main body. From then on, the limiting portion abuts on the first limiting surface, and the end of the reinforcing piece away from the limiting portion abuts on the second limiting surface.

The arrangement of the first limiting surface and the second limiting surface can prevent the fingerprint identification device from falling out of the fingerprint installation hole on the one hand, and prevent the reinforcing element from damaging the metal wiring on the flexible circuit board on the other hand.

In a possible implementation, the reinforcing member is provided with a positioning column, at least two positioning columns are arranged at intervals, the elastic member is provided with a positioning hole, the positioning column and the positioning hole are matched and connected, and the elastic member is bonded to the reinforcing member superior.

The positioning column on the reinforcing piece is matched with the positioning hole on the elastic piece to perform pre-positioning during the assembly process of the reinforcing piece and the elastic piece. Pre-positioning can prevent the flexible elastic piece from being skewed when it is pasted on the reinforcing piece. .

In a possible implementation, the elastic member includes an elastic body and fixing portions disposed at both ends of the elastic body, the fixing portions are hooks connected to the ends of the elastic body, and the hooks are hooked on the fixing posts.

The hook-shaped fixing portion is hooked on the fixing column, and has a simple structure and is easy to assemble.

In a possible implementation manner, a trigger portion is protruded from the side of the elastic body facing the key switch, and the trigger portion is arranged in contact with the key switch.

When the user presses the fingerprint identification device, the elastic member can be deformed, and the fingerprint module, the first section of the flexible circuit board, the reinforcing member and the elastic member can travel inward for a certain distance, and the displacement of this section makes the trigger part press the key switch, The key switch travels inward for a certain distance, thereby realizing the key function.

In one possible embodiment, the elastic element is made of thermoplastic polyurethane.

The elastic member can be made of thermoplastic polyurethane, and by virtue of its variability, it is not only beneficial for the fingerprint identification device to be fixed on the rear case, but also enables the fingerprint identification device to be displaced and pressed to trigger the key switch.

In a possible implementation, the front case includes a horizontal support plate and an annular rib, the display screen is connected to the horizontal support plate, the annular rib is connected to the frame and is arranged around the display screen, and is located between the fingerprint installation hole and the annular rib A groove is arranged on the frame between the two, and a protrusion is arranged on the annular rib, and the protrusion and the groove are inserted and matched.

The protrusion on the front shell is clamped in the groove on the rear shell, which can increase the structural strength of the side wall next to the fingerprint installation hole, and can avoid the occurrence of fingerprint modules caused by the deformation of the nearby side wall after pressing the fingerprint identification device. skewed problem.

The embodiment of the present application provides an electronic device with a side fingerprint identification device, the fingerprint identification device includes a fingerprint module, a flexible circuit board, a reinforcing member and an elastic member, and the fingerprint identification device can be installed from the inside of the rear case to the side wall of the rear case The fingerprint identification device and the rear shell can be pre-fixed by fixing the two ends of the elastic member on the fixing posts in the rear shell; the position of the front shell facing the fingerprint mounting hole is fixed. There is a key switch, the elastic part is in contact with the key switch, the elastic part can be deformed, and the key switch can be triggered after pressing the fingerprint recognition device, so that the fingerprint recognition and key functions can be combined into one; the cost of the elastic part is low and takes up space It will not affect the structural strength of the front shell, and the assembly difficulty with the rear shell is low. After the fingerprint identification device is pre-fixed to the rear shell, the impact on the assembly of the rear shell to the front shell is small, and it will not cause The device is bumped and damaged, which can improve the reliability of electronic equipment.

Description of drawings

FIG. 1 is a schematic structural diagram of an electronic device provided by an embodiment of the present application;

2 is an exploded schematic diagram of an electronic device provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a fingerprint identification device provided by an embodiment of the present application;

4 is an exploded view corresponding to the fingerprint identification device provided in FIG. 3;

5 is a schematic diagram of an assembly process of a rear case and a fingerprint identification device provided by an embodiment of the present application;

6 is a partial enlarged view of a rear case provided by an embodiment of the present application;

7 is a schematic partial structural diagram of a fingerprint identification device installed on a rear case provided by an embodiment of the present application;

8 is a schematic structural diagram of a fingerprint identification device, a rear case, and a front case provided by an embodiment of the application;

FIG. 9 is a schematic structural diagram of a fingerprint identification device from another angle according to an embodiment of the present application;

10 is a schematic partial cross-sectional schematic diagram corresponding to the fingerprint identification device, the front case and the rear case after being assembled according to an embodiment of the application;

FIG. 11 is another partial cross-sectional schematic diagram corresponding to the fingerprint identification device, the front case and the rear case after being assembled according to an embodiment of the application.

Description of reference numbers:

100-electronic equipment; 11-display; 12-rear shell; 120-frame; 1201, 1202, 1203, 1204-through hole; 121-side wall; 1211-fingerprint mounting hole; 1212-groove; 1214-blocking wall ; 1215 - the first limit surface; 1216 - the second limit surface; 122 - extension wall; 1221 - fixed column; 123 - bracket; 13 - front shell; 131 - horizontal support plate; Rib; 1331-protrusion; 14-back cover; 15-mainboard; 16-battery;

200-fingerprint identification device; 21-fingerprint module; 22-flexible circuit board; 221-first segment; 222-second segment; 223-third segment; 224-fourth segment; 225-ground area; 226-arc 23-reinforcing piece; 231-metal sheet body; 232-positioning post; 233-limiting part; 24-elastic part; 241-elastic body; 242-fixing part; 243-positioning hole; 244-triggering part ;25-connector;

300 - key switch.

detailed description

The embodiments of the present application provide an electronic device, including but not limited to a mobile phone, a tablet computer, a notebook computer, an ultra-mobile personal computer (UMPC), a handheld computer, a walkie-talkie, a netbook, a POS machine, a personal digital assistant ( Personal digital assistant, PDA), wearable devices, virtual reality devices, wireless U disks, Bluetooth speakers, Bluetooth headsets or vehicle-mounted devices and other mobile or fixed terminal equipment with fingerprint identification devices.

In the related art, for an electronic device adopting a structure of display screen + metal middle frame + back cover, the metal middle frame is provided with a fingerprint mounting hole, and the fingerprint identification device includes a fingerprint module, a flexible circuit board and a reinforcement connected in sequence. The assembly sequence is to extend the fingerprint identification device into the fingerprint installation hole from the outside to the inside, and then from the inner side of the metal middle frame, the reinforcing plate is fixed on the inner side of the metal middle frame through a separate metal bracket. The metal bracket occupies a large space and has a high cost.

For electronic devices with the structure of display screen + metal front shell + non-metal rear shell + back cover, if the above-mentioned metal bracket is used to fix the fingerprint identification device, on the one hand, the metal bracket occupies a large space, which will affect the The structural strength of the front shell reduces the structural strength of the whole machine, and on the other hand, the cost of adding a metal bracket is high. If a metal bracket is not used to pre-fix the fingerprint identification device, it will be difficult to assemble the front shell and the rear shell, and the fingerprint identification device and the components on the front shell will be bumped and damaged during the process of snapping the rear shell to the front shell. .

Based on the above description, an embodiment of the present application provides an electronic device with a side fingerprint identification device, the fingerprint identification device includes a fingerprint module, a flexible circuit board, a reinforcing member and an elastic member, and the fingerprint identification device can be installed from the inside of the rear case to the The fingerprint identification device and the rear shell are pre-fixed by fixing the two ends of the elastic piece in the fingerprint installation hole on the side wall of the rear shell on the fixing posts in the rear shell. The elastic part has low cost, takes up less space, will not affect the structural strength of the front shell, and is less difficult to assemble with the rear shell. After the fingerprint identification device is pre-fixed to the rear shell, the rear shell is assembled to the front shell. The impact on the device is small, the device will not be damaged by bumping, and the reliability of the electronic device can be improved.

The structure of the fingerprint identification device provided by the embodiments of the present application will be specifically described below with reference to the accompanying drawings and specific embodiments. In the embodiments of the present application, a fingerprint identification device applied to a mobile phone is used as an example. It should be noted that, for ease of description, in the drawings of the embodiments of the present application, the directions of the X axis, the Y axis, and the Z axis represent the length, width, and thickness directions of the electronic device, respectively. The direction pointing to the back is the positive direction of the Z axis.

FIG. 1 is a schematic structural diagram of an electronic device according to an embodiment of the application, and FIG. 2 is an exploded schematic diagram of the electronic device according to an embodiment of the application. 1 and 2, the electronic device 100 includes a display screen 11, a front case 13, a rear case 12, and a back cover 14, which are arranged in sequence. The frame 120 of the casing 12 is used as the side of the electronic device 100, the front casing 13 and the back cover 14 are respectively connected to the two sides of the frame 120 of the rear casing 12, and the frame 120 of the front casing 13, the back cover 14 and the rear casing 12 are jointly formed into a accommodating space, the main board, battery, camera module and other components can be arranged in the accommodating space.

The back cover 14 may be made of ceramic, metal, plastic and other materials, the rear case 12 may be made of plastic material, and the front case 13 may be made of metal such as aluminum alloy. The back cover 14 is provided with an opening 141 corresponding to the camera module, and the back cover 14 can be connected to the back case 12 by means of bonding, clamping or the like. The frame 120 of the rear case 12 includes a side wall 121 and an extension wall 122. The side wall 121 serves as an outer frame of the electronic device 100. The extension wall 122 is formed by extending inward from the side of the side wall 121 facing the back cover 14. The back cover 14 may be The back cover 14 and the rear case 12 are fixed by being connected to the extension wall 122 by means of bonding, snap connection, or the like. The back cover 14 is provided with an opening 141 corresponding to the camera module, and the back cover 12 further includes a bracket 123 which is connected to the inside of the frame 120 and is disposed near the back cover 14 for supporting the camera module and other components.

The front case 13 may include a horizontal support plate 131 and a boss 132 protruding from the horizontal support plate 131. The display screen 11 may be glued on one surface of the horizontal support plate 131, and the other surface of the horizontal support plate 131 is To connect the main board, sub board, battery and other components. The bosses 132 are protrudingly disposed on the surface of the horizontal support plate 131 facing away from the display screen 11, and are used to install components such as key switches. The front case 13 can be fixedly connected to the rear case 12 by means of bonding, clamping, screwing or the like.

The electronic device 100 is provided with a fingerprint identification device 200 for realizing a fingerprint identification function. Different from the solution in the related art in which the fingerprint identification device 200 is arranged on the front or the back of the electronic device 100 , in the embodiment of the present application, the fingerprint identification device 200 can be arranged on the side of the electronic device 100 to meet the requirements of the front and back of the electronic device 100 integrated design. The fingerprint identification device 200 can be set independently or combined with the function buttons on the side of the electronic device 100 to reduce the number of components on the side of the electronic device 100 and improve the simplicity and aesthetics of the electronic device 100 .

In the electronic device 100, the position of the power button will be closer to the position where the user holds the electronic device 100, for example, it is set close to the thumb, and the number of the power button is one. From the perspective of user experience and design simplicity, the fingerprint can be The identification device 200 is integrated with the power key. In the embodiment of the present application, the structure and assembly method of the fingerprint identification device 200 are described in detail by taking the integration of the fingerprint identification device 200 and the power key as an example.

On the side wall 121 of the rear case 12 , through holes for installing volume keys, for exporting the sound of the speaker, for connecting charging plugs, and for connecting

headphone plugs

1201 , 1202 , 1203 , 1204 , etc. can be respectively provided. In the embodiment of the present application, the side frame 121 is further provided with a fingerprint installation hole 1211 , and the fingerprint identification device 200 is installed in the fingerprint installation hole 1211 .

The structure of the fingerprint identification device will be described in detail below with reference to FIG. 3 and FIG. 4 .

FIG. 3 is a schematic structural diagram of a fingerprint identification device provided by an embodiment of the present application, and FIG. 4 is an exploded view corresponding to the fingerprint identification device provided in FIG. 3 . Referring to FIGS. 3-4 , the fingerprint identification device 200 includes a fingerprint module 21 , a flexible circuit board 22 , a reinforcing member 23 , an elastic member 24 and a connector 25 .

The fingerprint module 21 is installed in the fingerprint installation hole 1211 , and the outer surface of the fingerprint module 21 is exposed outside the electronic device 100 to provide a touch area for the user. The flexible circuit board 22 is connected to the inner surface of the fingerprint module 21 for electrically connecting the fingerprint module 21 to the main board inside the electronic device 100 . The reinforcing member 23 is connected to the surface of the flexible circuit board 22 away from the fingerprint module 21 , and the reinforcing member 23 can be a stainless steel sheet to improve the overall structural strength of the fingerprint module 21 . The elastic member 24 is connected to the side surface of the reinforcing member 23 away from the fingerprint module 21 for fixing the fingerprint module 21 on the rear case 12. The elastic member 24 can be made of TPU (Thermoplastic Polyurethane, thermoplastic polyurethane), rubber , silicone and other materials with certain elasticity, which are made by one-piece injection molding process. The connector 25 is connected to the end of the flexible circuit board 22 for electrically connecting the flexible circuit board 22 and the main board inside the electronic device 100 .

Specifically, the shape of the fingerprint module 21 is the same as the shape of the fingerprint installation hole 1211, which can be in the shape of a rectangle, an ellipse, a waist circle, etc. The length and width of the fingerprint module 21 are slightly smaller than the size of the fingerprint installation hole 1211, so that the The fingerprint module 21 can be inserted into the fingerprint installation hole 1211 . The fingerprint module 21 is provided with a fingerprint chip. The fingerprint chip can be a capacitive fingerprint chip. Different fingerprints can be identified by using the principle of different capacitance values corresponding to uneven fingerprints of different shapes.

The flexible circuit board 22 includes a first segment 221 , a second segment 222 , a third segment 223 and a fourth segment 224 connected in sequence, wherein the first segment 221 is located between the fingerprint module 21 and the reinforcing member 23 , and the flexible circuit board The first section 221 of 22 is welded with the fingerprint module 21 by surface mount technology to achieve electrical connection, and then fill the gap around the solder joint by dispensing glue, which can prevent the sweat on the user's finger from entering the gap and causing damage to the solder joint. corrosion. The second segment 222 is formed by extending the first segment 221 along its length direction. The plane where the first segment 221 and the second segment 222 are located can be parallel to the inner surface of the fingerprint module 21 and located in the XZ plane. The length extension direction of the third segment 223 may be set at an included angle with the length extension direction of the second segment 222 , and the included angle is around 90 degrees. The third segment 223 is not on the same plane, and its width direction and the lengthwise extending direction of the second segment 222 may be the same. The length extension direction of the fourth segment 224 and the length extension direction of the third segment 223 are arranged at an included angle, and the included angle is also around 90 degrees. The plane where the fourth segment 224 is located can be close to perpendicular to the inner surface of the fingerprint module 21, in the XY plane. The end of the fourth section 224 is connected to the connector 25, and the connector 25 can be a BTB (Board To Board, board to board) connector, which is used for snapping on the main board to realize the electrical connection between the flexible circuit board 22 and the main board.

The flexible circuit board 22 is also provided with a grounding area 225, and the grounding area 225 is used to connect to the front case 13 made of metal, so as to discharge static electricity. The grounding region 225 may be connected to a side of the third segment 223 facing the first segment 221 and disposed close to the second segment 222 . The flexible circuit board 22 is also provided with an arc-shaped groove 226 . The connection position of the third segment 223 of the arc-shaped groove 226 and the grounding region 225 is recessed toward the interior of the grounding region 225 .

The reinforcing member 23 includes a metal sheet body 231. The metal sheet body 231 is rectangular as a whole, and its length direction is consistent with the length direction of the first section 221. The metal sheet body 231 is electrically connected to the first section 221 of the flexible circuit board 22 through conductive glue. , so as to conduct the static electricity released from the outside (including the user's fingers) to the reinforcing member 23 to the flexible circuit board 22 , and then return to the ground through the grounding area 225 . The side of the reinforcement member 23 close to the second section 222 of the flexible circuit board 22 is bonded to the flexible circuit board 22 by glue, so as to prevent the sharp edge of the reinforcement member 23 from being sensitive to the flexible circuit board 22 during repeated pressing of the fingerprint identification device 200 . The circuit board 22 causes wear. One end of the reinforcing member 23 close to the second section 222 of the flexible circuit board 22 is provided with a limiting portion 233 . 231 coplanar.

The elastic member 24 includes an elastic main body 241 and a fixing portion 242 disposed at both ends of the elastic main body 241. The elastic main body 241 is bonded to the metal sheet main body 231. The side extensions are formed to be fixed on the rear case 12 . The side of the metal sheet main body 231 facing the elastic member 24 is protruded with positioning posts 232. The number of the positioning posts 232 is at least two, and they are arranged at a certain distance. The elastic body 241 is provided with positioning holes 243. The positioning posts 232 and The positioning holes 243 are cooperatively arranged to perform pre-positioning during the assembly process of the reinforcing member 23 and the elastic member 24 , and the pre-positioning can prevent the flexible elastic member 24 from being skewed when pasted on the reinforcing member 23 .

The middle of the elastic member 24 is also provided with a triggering portion 244 . The key switch has the characteristics of being indented for a certain distance after being pressed, and rebounding after the pressing force is removed. For example, the inside of the key switch may include an elastic metal sheet. When the user presses the fingerprint identification device 200, the elastic member 24 can be deformed, and the fingerprint module 21, the first section 221 of the flexible circuit board 22, the reinforcing member 23, and the elastic body 241 of the elastic member 24 can travel inward for a certain distance. The segment displacement makes the trigger portion 244 press the key switch, and the key switch travels inward for a certain distance, thereby realizing the function of the power key. After the pressing force is removed, the key switch rebounds, the elastic member 24 rebounds accordingly, and the fingerprint module 21 returns to the initial position.

In the embodiment of the present application, the provision of the elastic member 24 to realize the pre-fixation of the fingerprint identification device 200 and the rear case 12 is not only conducive to assembly, but also the elastic member 24 is provided as a long strip, which is compared with other solutions in the form of brackets. , the occupied space is small, which is beneficial to the compact design of the electronic device 100 .

Hereinafter, with reference to FIGS. 5-7 , the cooperation between the fingerprint identification device 200 and the rear case 12 will be described in detail.

FIG. 5 is a schematic diagram of an assembly process of a rear case and a fingerprint identification device provided by an embodiment of the application, and FIG. 6 is a partial enlarged view of the rear case provided by an embodiment of the application. The enlarged position corresponds to A in FIG. 5 . 7 is a partial structural schematic diagram of the fingerprint identification device installed on the rear case provided by an embodiment of the present application. 5-7, when assembling the fingerprint identification device 200 into the electronic device 100, it needs to be installed from the inside out, that is, the fingerprint identification device 200 is installed from the inside of the rear case 12 along the direction indicated by the arrow in the figure, Installed into the fingerprint mounting hole 1211.

The two sides of the fingerprint mounting hole 1211 in the length direction are respectively provided with fixing posts 1221. The fixing posts 1221 are protruded from the inner wall of the side wall 121 or protruded from the wall surface of the extension wall 122 facing away from the back cover 14. The fixing posts 1221 Extends in the direction away from the back cover 14, that is, in the opposite direction of the Z axis, so that the elastic member 24 is inserted between the fixed column 1221 and the inner wall surface of the side wall 121 along the positive direction of the Z axis, and the two fixed parts are 242 are respectively hooked on the two fixing posts 1221, so that the displacement of the elastic member 24 in the X direction and the Y direction can be restricted. The fixing portion 242 can be in the shape of an "L"-shaped or "U-shaped" hook to be hooked on the fixing post 1221, or a closed "O" ring to be sleeved on the fixing post 1221, or a protruding step to be clamped between the fixing post 1221 and the side wall 121 .

The inner wall of the frame 120 is also provided with a first limiting surface 1215 and a second limiting surface 1216 . The first limiting surface 1215 and the second limiting surface 1216 are coplanar and are respectively located at the length direction of the fingerprint mounting hole 1211 . On both sides, the two first limiting surfaces 1215 may be respectively inwardly recessed planes formed on the side wall 121 and the extension wall 122 , and the two limiting portions 233 of the reinforcing member 23 abut on the two correspondingly On the first limiting surface 1215 , one end of the reinforcing member 23 away from the limiting portion 233 is elongated relative to the fingerprint module 21 and abuts on the second limiting surface 1216 . Therefore, the displacement of the fingerprint identification device 200 in the negative direction of the Y-axis can be restricted, and the fingerprint identification device 200 can be prevented from coming out of the fingerprint installation hole 1211 .

On the other hand, the reinforcing member 23 is only in contact with the first limiting surface 1215 through the limiting portion 233, and one end is in contact with the second limiting surface 1216, and the other parts are located in the limiting portion without contact with the inner wall of the frame 120. Between 233 and the first limiting surface 1215, and between the end extension of the reinforcing member 23 and the second limiting surface 1216, no metal wiring is arranged on the flexible circuit board 22, so that the reinforcing member 23 can be avoided. After repeated contact with the frame 120 , the metal traces on the flexible circuit board 22 are damaged, and the service life of the flexible circuit board 22 is further improved.

When the fingerprint identification device 200 is installed in the fingerprint installation hole 1211, the elastic member 24 can be deformed by using the feature that one of the fixing portions 242 of the elastic member 24 can be hooked on the fixing post 1221 first, and then the fingerprint module 21 can be hooked. Extend into the fingerprint installation hole 1211, so that the fingerprint module 21 is clamped in place in the fingerprint installation hole 1211. After the limit part 233 of the reinforcing member 23 is clamped in place in the limit surface 1215, another fixing part 242 The hook is provided on another fixing post 1221 , so that the fingerprint identification device 200 is assembled on the rear case 12 . Exemplarily, the fixing portion 242 near the second segment 222 can be hooked on the fixing column 1221 near the retaining wall 1214 first.

The fingerprint identification device 200 is pre-fixed on the rear case 12 with simple assembly steps, low operational difficulty, and high stability in batch assembly, which is beneficial to improve production efficiency and reduce production costs. In addition, after the fingerprint identification device 200 is pre-fixed on the rear shell 12, the fingerprint identification device 200 will not affect the front shell 13 when the rear shell 12 is assembled to the front shell 13, and the rear shell 12 can be directly buckled on the front shell 13. On the front case 13 , it is not easy to damage the fingerprint recognition device 200 and the key switches on the front case 13 because the fingerprint recognition device 200 is separated from the fingerprint installation hole 1211 during the assembly process.

The inner wall surface of the side wall 121 is also protruded with a retaining wall 1214 , the plane where the retaining wall 1214 is located is parallel to the plane where the first section 221 of the flexible circuit board 22 is located, and the plane where the retaining wall 1214 is located is the same as the second plane of the flexible circuit board 22 . The distance between the two ends 222 is the same as the thickness of the adhesive. The second section 222 of the flexible circuit board 22 is bonded to the retaining wall 1214 through the adhesive. On the one hand, the second section of the flexible circuit board 22 can be guaranteed. The plane where the 222 is located is always parallel to the plane where the first segment 221 is located, so as to prevent the second segment 222 from skewing and driving the fingerprint module 21 to skew. The other parts of the plate 22 generate a pulling force on the second segment 222 to prevent the fingerprint module 21 from being skewed when the second segment 222 is skewed by force.

There is an assembly gap between the fingerprint module 21 and the fingerprint installation hole 1211. When the user's finger touches the fingerprint module 21, since the first section 221 of the flexible circuit board 22 and the reinforcing member 23 are both made of metal, and the distance between the user and the finger It is smaller than the distance between the front case 13 and the finger, so the static electricity on the user's finger will be released to the flexible circuit board 22 and the reinforcing member 23 . If the flexible circuit board 22 is extended to connect with the main board to achieve grounding, static electricity may damage the components on the main board. To avoid static electricity from damaging the components on the main board, it is necessary to connect the connector 25 to each line connected to the main board. Protecting the device, which will occupy the area of the motherboard and increase the cost of the device. In the embodiment of the present application, a grounding area 225 is set at the position of the flexible circuit board 22 closest to the front case 13, and the exposed copper foil at the grounding area 225 is connected to the front case 13 through conductive foam to achieve grounding, which can achieve the shortest static electricity. The path is grounded, and there is no need to connect high-cost protective devices to release static electricity in time, without damaging the devices on the main board, and the safety is higher.

Specifically, the conductive foam can be adhered to a specific area on the front case 13 by conductive glue. After the rear case 12 and the front case 13 are assembled, the conductive foam is in close contact with the exposed copper foil on the grounding area 225 to achieve conduction. The grounding area 225 abuts on the extension wall 122 of the rear case 12 under the extrusion of the conductive foam and the front case 13 , or the grounding area 225 can also be adhered to the extension wall 122 of the rear case 12 . Compared with the solution of sticking the conductive foam on the grounding area 225, the solution of bonding the conductive foam to the front shell 13 is more conducive to the precise positioning of the conductive foam relative to the front shell 13, so that the conductive foam can be ensured Reliable connection of cotton and ground area 225.

After the fingerprint identification device 200 is installed on the rear case 12 and the second section 222 of the flexible circuit board 22 is bonded to the retaining wall 1214, the conductive foam needs to be bonded to the front case 13 through conductive glue, and then The rear case 12 is fastened on the front case 13 , and the conductive foam is pressed on the grounding area 225 , so as to realize the connection between the grounding area 225 and the front case 13 .

Hereinafter, with reference to FIGS. 8-11 , the cooperation of the fingerprint identification device 200 with the rear case 12 and the front case 13 will be described in detail.

FIG. 8 is a schematic structural diagram of a fingerprint identification device, a rear case, and a front case provided by an embodiment of the application, and FIG. 9 is a schematic structural diagram of another angle of the fingerprint identification device provided by an embodiment of the application. The fingerprint identification in FIG. 9 The angles of the device correspond to those in FIG. 8 . Referring to FIG. 8 and FIG. 9 , the main board 15 can be installed on the front case 13 at the position corresponding to the bracket 123 of the rear case 12 , the battery 16 can be installed in the middle of the front case 13 , and the third section 223 of the flexible circuit board 22 from the back The extension wall 122 of the shell 12 and the boss 132 of the front shell 13 protrude. The third section 223 and the fourth section 224 of the partial length are sandwiched between the battery 16 and the back cover 14. The end of the fourth section 224 It extends to the main board 15 and is fastened to the main board 15 through the connector 25 .

Since the third section 223 of the flexible circuit board 22 needs to extend along the extending wall 122 of the rear case 12 , the bosses 132 of the front case 13 , and the surface of the battery 16 , many of which are in a bent state, after the rear case 12 is assembled During the process of reaching the front case 13 and the process of buckling the connector 25 on the main board 15, the third section 223 and the fourth section 224 need to be pulled, and the electronic device 100 is bumped after the assembly is completed. All three sections 223 will be subjected to tension, and when the third section 223 is subjected to force, the grounding area 225 will be deformed, which may cause the grounding state of the grounding area 225 to fail, and cause the connection between the third section 223 and the grounding area 225 to tear. . When the third section 223 is stressed, the second section 222 will also be pulled, causing the fingerprint module 21 to be skewed. In the embodiment of the present application, an arc-shaped groove 226 is provided at the connection between the third section 223 and the grounding area 225, and the arc-shaped groove 226 is recessed toward the interior of the grounding area 225, which can play a role in releasing force, and on the one hand, can prevent the flexible circuit board 22 is torn by force, on the other hand, the pulling force of the third section 223 on the grounding area 225 can be reduced, and the grounding state of the grounding area 225 can be prevented from failing. The fixing function of the segments 222 adhered to the retaining wall 1214 can jointly prevent the fingerprint module 21 from being skewed.

FIG. 10 is a schematic cross-sectional view of the fingerprint identification device, the front case and the rear case after assembling, and the cross-sectional position corresponds to B-B in FIG. 8 . Referring to FIG. 10 , there is an accommodation space between the boss 132 of the front case 13 and the side wall 121 of the rear case 12 , the fingerprint identification device 200 is arranged in the accommodation space, and the surface of the boss 132 facing the fingerprint mounting hole 1211 A key switch 300 is provided. When the fingerprint module 21 of the fingerprint identification device 200 is installed in the fingerprint installation hole 1211 , the trigger portion 244 on the elastic member 24 is in contact with the key switch 300 . When the fingerprint module 21 is pressed, the triggering part 244 applies pressure to the key switch 300, so that the key switch 300 can be triggered to realize the function of the power key.

Since the elastic member 24 has certain elasticity and low hardness, when the trigger portion 244 contacts and presses the key switch 300 , the key switch 300 is not easily damaged, which is beneficial to prolong the life of the key switch 300 . It should be noted that the contact between the trigger portion 244 and the key switch 300 described in the embodiments of the present application can be understood as a contact within the allowable range of installation errors, and there may be a small gap due to installation errors.

It should be noted that, in the embodiment of the present application, the key switch 300 can be electrically connected to the main board 15 through a flexible circuit board, a wire, etc., and the key switch 300 and the fingerprint module 21 do not share the flexible circuit board, which is convenient for the key switch 300 and fingerprint recognition. The device 200 is assembled separately, and maintenance costs can be saved. In addition, when the key switch 300 and the fingerprint module 21 do not share the flexible circuit board, the elastic sheet of the key switch 300 is disposed facing the fingerprint module 21 , and the user has a distinct hand feeling when pressing the key switch 300 . However, when the key switch 300 and the fingerprint module 21 share a flexible circuit board, the key switch 300 of the key switch 300 needs to be disposed facing the front case 13, and the hand feeling is poor when pressed.

At this time, the key switch 300 of the power key can share a flexible circuit board with the key switch of the volume key next to it. The flexible circuit board can extend along the boss 132 on the front case 13 and be connected to the main board 15 by means of shrapnel or the like. superior.

FIG. 11 is another partial cross-sectional schematic diagram corresponding to the fingerprint identification device and the front case and the rear case after assembly according to an embodiment of the application, and the cross-sectional position corresponds to C-C in FIG. 8 . Referring to FIG. 11 , the front case 13 further includes an annular rib 133 connected to the edge of the horizontal support plate 131 and formed by extending from the edge of the horizontal support plate 131 toward one side of the display screen 11 . The annular rib 133 is connected to the side of the side wall 121 that is close to the display screen 11 .

A groove 1212 is provided on the side wall 121 between the fingerprint mounting hole 1211 and the annular rib 133. The annular rib 133 is provided with a protrusion 1331 corresponding to the groove 1212. The protrusion 1331 is clamped in the groove 1212, and can be Increasing the structural strength of the side wall 121 beside the fingerprint installation hole 1211 can avoid the problem of skew of the fingerprint module 21 caused by the deformation of the nearby side wall 121 after the fingerprint identification device 200 is pressed.

On the whole, the assembling process of the electronic device 100 with the fingerprint identification device 200 provided by the embodiment of the present application is as follows: firstly, the fingerprint identification device 200 is installed into the fingerprint installation hole 1211 of the rear case 12 from the inside to the outside, and the two ends of the elastic member 24 are assembled. The fixing part 242 is hooked on the fixing post 1221 on the rear shell 12 to realize the pre-fixation of the fingerprint identification device 200 and the rear shell 12; then, the rear shell 12 is installed on the front shell 13 on which the key switch 300 has been fixed; Finally, the connector 25 of the identification device 200 is snapped onto the motherboard 15 .

An electronic device with a side fingerprint identification device provided by the embodiment of the present application, the fingerprint identification device includes a fingerprint module, a flexible circuit board, a reinforcing member and an elastic member, and the fingerprint identification device can be installed from the inside of the rear case to the side wall of the rear case The fingerprint identification device and the rear shell can be pre-fixed by fixing both ends of the elastic member on the fixing posts in the rear shell. A key switch is fixed on the front shell facing the fingerprint installation hole, and the elastic member is in contact with the key switch. The elastic member can be deformed. After pressing the fingerprint recognition device, the key switch can be triggered, so that the combination of fingerprint recognition and key functions can be realized. Two is one. The cost of the elastic part is low, the space occupied is small, the structural strength of the front case is not affected, and the assembly difficulty with the rear case is low. After the fingerprint identification device is pre-fixed to the rear case, the rear case is assembled to the front case. The impact on the device is small, the device will not be damaged by bumping, and the reliability of the electronic device can be improved.

In the embodiments of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it may be a fixed connection or an intermediate medium. The indirect connection can be the internal communication of two elements or the interaction relationship between the two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the embodiments of the present application according to specific situations. The terms "first", "second", "third", etc. in the description and claims of the embodiments of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. order.

Furthermore, the terms "comprising" and "having" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those expressly listed Rather, those steps or units may include other steps or units not expressly listed or inherent to these processes, methods, products or devices.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, but not to limit them; It should be understood that: it is still possible to modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements to some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the embodiments of the present application Scope of technical solutions.

Claims

An electronic device, characterized in that it comprises a display screen, a metal front case, a non-metal rear case and a back cover, the display screen is connected to the front case, and the front case and the back cover are respectively connected to the On the two sides of the rear case, the front case, the back cover and the rear case enclose an accommodating space, and a main board and a fingerprint identification device are arranged in the accommodating space;

The frame of the rear case is provided with a fingerprint installation hole, the inner wall of the frame is provided with two fixing posts, and the two fixing posts are respectively located on both sides of the fingerprint installation hole in the length direction. A key switch is provided on the boss facing the fingerprint installation hole, the fingerprint identification device includes a fingerprint module, a flexible circuit board, a reinforcing member and an elastic member, and the fingerprint module is arranged in the fingerprint installation hole and The outer surface of the fingerprint module is exposed outside the fingerprint installation hole, one end of the flexible circuit board is connected between the fingerprint module and the reinforcing member, and the other end of the flexible circuit board is connected to the The main board is electrically connected, the elastic member is connected to the side of the reinforcing member facing the key switch, the two ends of the elastic member are respectively provided with fixed parts, and the two fixed parts are respectively connected to two on the fixed column.
The electronic device according to claim 1, wherein the flexible circuit board comprises a first segment, a second segment, a third segment and a fourth segment connected in sequence, and the first segment is located in the fingerprint module and the reinforcing piece, the second section extends along the side wall of the frame, the third section is located between the frame and the boss, and the fourth section extends along the The inner surface of the back cover extends and the end of the fourth segment is fastened on the main board through the connector.
The electronic device according to claim 2, wherein a grounding area is provided on the flexible circuit board, and a conductive copper foil is exposed on a surface of the grounding area facing the front case, and the front case passes the conductive copper foil. The adhesive is bonded with conductive foam, and the conductive foam is sandwiched between the grounding area and the front case.
The electronic device according to claim 3, wherein the grounding area is connected in the width direction of the third segment and is disposed close to the second segment, and the grounding area and the third segment are The connection is provided with an arc-shaped groove recessed toward the interior of the grounding region.
The electronic device according to any one of claims 2-4, wherein a retaining wall is protruded from the inner wall of the frame, and the surface of the retaining wall is parallel to the plane where the fingerprint module is located, so The second section is adhered to the retaining wall by adhesive backing.
The electronic device according to any one of claims 1-5, wherein the reinforcing member is set as a metal member, and the reinforcing member is connected to the flexible circuit board through conductive glue.
The electronic device according to any one of claims 2-6, wherein the inner wall of the frame is provided with a coplanar first limiting surface and a second limiting surface, the first limiting surface and The second limiting surfaces are respectively located on both sides of the fingerprint installation hole in the length direction, and the reinforcing piece includes a metal piece body and a limiting portion, and the limiting portion is arranged near the reinforcing piece. At one end of the second section of the flexible circuit board, the limiting portion is a protrusion on the broad sides of the two sides of the metal piece main body, and the limiting portion abuts on the first limiting surface, so One end of the reinforcing piece away from the limiting portion abuts on the second limiting surface.
The electronic device according to any one of claims 1-7, wherein a positioning column is provided on the reinforcing member, at least two positioning columns are arranged at intervals, a positioning hole is provided on the elastic member, and the elastic member is provided with a positioning hole. The positioning column is matched and connected with the positioning hole, and the elastic member is bonded on the reinforcing member.
The electronic device according to any one of claims 1-8, wherein the elastic member comprises an elastic body and a fixing portion disposed at both ends of the elastic body, and the fixing portion is a fixed portion connected to the elastic body. The hook at the end, the hook is hooked on the fixing column.
The electronic device according to any one of claims 1-9, wherein a trigger portion is protruded from a side of the elastic body facing the key switch, and the trigger portion is provided in contact with the key switch. .
The electronic device according to any one of claims 1-10, wherein the elastic member is made of thermoplastic polyurethane.
The electronic device according to any one of claims 1-11, wherein the front case comprises a horizontal support plate and an annular rib, the display screen is connected to the horizontal support plate, and the annular rib and the annular rib are connected to the horizontal support plate. The frame is connected and is arranged around the display screen, a groove is provided on the frame between the fingerprint mounting hole and the annular rib, a protrusion is arranged on the annular rib, and the convex It is inserted and matched with the groove.