Button motor and electronic device

Abstract

Disclosed in the present invention are a button motor and an electronic device. The button motor comprises a support frame having an accommodating space, a stator accommodated and fixed in the accommodating space, a vibrator moving in a first direction relative to the stator, a button fixed on the vibrator, a flexible circuit board supported in the support frame, and sensors for detecting the movement of the vibrator. The stator comprises steel magnet sets fixed to the support frame; the vibrator comprises an iron core fixedly connected to the button and a coil wound around the iron core, and the flexible circuit board is electrically connected to the coil. The button motor further comprises non-metal elastic members sandwiched between the iron core and the support frame, and the non-metal elastic members are deformable in the first direction. The button motor of the present invention can reduce the space occupied by the non-metal elastic members by means of a non-metal elastic design, allowing the size of the magnetic circuit of the button motor to be maximized within the same structural size, thereby ensuring sufficient driving force.

Description

Key motor and electronic device TECHNICAL FIELD

[0001] The present application relates to the technical field of keys, in particular to a key motor and an electronic device. BACKGROUND

[0002] The touch key is a key technology for realizing corresponding control by sensing a pressing signal, specifically, a technology for accurately detecting by sensing a pressing position and a pressing degree to achieve precise control.

[0003] The touch key mainly includes a support frame, a motor fixed in the support frame, a flexible circuit board fixed to the motor, a key fixed to the motor, and a sensor fixed to the key; the motor includes a magnetic steel as a stator and a coil as a vibrator, the stator is fixed to the support frame, and the vibrator is elastically supported on the support frame and is spaced apart from the stator. The specific principle is that when the key is pressed, the motor will produce displacement in the pressing direction, at this time the sensor can detect the pressing information, and the pressing action can be recognized through the flexible circuit board, so as to realize corresponding control.

[0004] In the related art, the vibrator is elastically supported on the support frame by a metal elastic member. Although this design increases the structural strength of the elastic member, it also increases the occupied space of the elastic member, which reduces the size of the magnetic circuit under the same size structure, resulting in insufficient driving force.

[0005] Therefore, it is necessary to provide a key motor to solve the above problems. TECHNICAL PROBLEM

[0006] The purpose of the present application is to provide a key motor and an electronic device to solve the problem that the vibrator in the related art is elastically supported on the support frame by a metal elastic member, thereby increasing the occupied space of the elastic member. TECHNICAL SOLUTION

[0007] In a first aspect, the present application provides a key motor, which includes a support frame having a receiving space, a stator received and fixed in the receiving space, a vibrator moving in a first direction relative to the stator, a key fixed to the vibrator, a flexible circuit board supported on the support frame, and a sensor detecting the movement of the vibrator;

[0008] The stator includes a magnetic steel group fixed to the support frame; the vibrator includes an iron core fixedly connected with the key and a coil wound on the iron core and spaced apart from the magnetic steel group, and the flexible circuit board is electrically connected with the coil;

[0009] The key motor further includes a non-metallic elastic member clamped between the iron core and the support frame, and the non-metallic elastic member can be deformed in the first direction.

[0010] Preferably, the non-metallic elastic member is made of silica gel or rubber.

[0011] Preferably, the non-metallic elastic member is in a block shape, and the key motor further comprises a connecting member integrally formed with the non-metallic elastic member, and the non-metallic elastic member is fixed to the iron core through the connecting member.

[0012] Preferably, a groove recessed away from the iron core is arranged on one side of the non-metallic elastic member, and the connecting member is formed in the groove.

[0013] Preferably, the stator comprises two magnetic steel groups respectively arranged on two sides of the coil along a second direction, the second direction is perpendicular to the first direction, the magnetic steel group comprises three magnetic steels fixed to the support frame at intervals along the first direction, the three magnetic steels are magnetized along the second direction, and magnetization directions of adjacent two magnetic steels are opposite.

[0014] Preferably, the flexible circuit board comprises a first support section located on a side of the iron core away from the key and a bending section formed by bending and extending from one end of the first support section, two ends of the first support section are respectively fixed to the support frame, the first support section is arranged at intervals along the first direction with the iron core, and the bending section is fixed to the support frame; the sensor is fixed to the first support section and arranged at intervals with the iron core.

[0015] Preferably, the flexible circuit board further comprises a second support section clamped between the first support section and the key and an elastic arm connecting the second support section and the bending section, the coil is electrically connected with the second support section, and the elastic arm is arranged at intervals along the first direction opposite to the non-metallic elastic member.

[0016] Preferably, a middle region of the first support section is fixed to a side of the iron core away from the key through a gasket, and the sensor is arranged on a side of the first support section facing the iron core and arranged at intervals with the gasket.

[0017] Preferably, the support frame comprises a first side wall arranged at intervals along the second direction and a second side wall arranged at intervals along a third direction, the third direction is perpendicular to the first direction and the second direction, the magnetic steel group is fixed to the first side wall, and the bending section is fixed to the second side wall.

[0018] In a second aspect, the present application provides an electronic device comprising a housing and a key motor as described above received in the housing, the outer side of the housing is provided with a receiving groove recessed inwardly, the groove bottom of the receiving groove is provided with a through hole; the support frame is fixed to the inner side of the housing, and part of the structure of the key is received in the receiving groove and fixed to the vibrator through the through hole. Advantages

[0019] Compared with the related art, the key motor of the present application can reduce the occupied space of the elastic member by designing the non-metallic elastic member clamped between the iron core and the support frame and enabling the non-metallic elastic member to deform in the first direction, so that the magnetic circuit size of the key motor can be maximized in the same size structure, and the driving force is sufficient. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Fig. 1 is a perspective structural schematic view of a key motor provided by an embodiment of the present application;

[0022] Fig. 2 is a perspective view of the structure of the key motor provided by an embodiment of the present application after disassembly;

[0023] Fig. 3 is a sectional view of line A-A in Fig. 1;

[0024] Fig. 4 is a top view of part of the structure of the key motor provided by an embodiment of the present application after disassembly;

[0025] Fig. 5 is a perspective structural schematic view of an electronic device provided by an embodiment of the present application;

[0026] Fig. 6 is a structural exploded view of an electronic device provided by an embodiment of the present application.

[0027] Wherein, 100, button motor; 1, support frame; 11, mounting portion; 12, mounting hole; 13, first side wall; 14, second side wall; 2, drive motor; 21, stator; 211, magnet group; 2111, magnet; 212, cover plate; 22, vibrator; 221, coil; 222, iron core; 3, flexible circuit board; 31, first support section; 32, bending section; 33, elastic arm; 34, second support section; 341, solder pad; 4, button; 41, main body portion; 42, first connecting portion; 43, second connecting portion; 5, sensor; 6, nonmetallic elastic member; 61, groove; 7, connecting member; 8, gasket; 9, guide member; 10, accommodating space; 200, electronic device; 201, housing; 202, accommodating groove; 203, through hole. Embodiments of the present application

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to 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. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0029] The embodiments of the present application provide a button motor 100, as shown in FIGS. 1 to 4, which comprises a support frame 1 having an accommodating space 10, a stator 21 accommodated and fixed in the accommodating space 10, a vibrator 22 moving in a first direction relative to the stator 21, a button 4 fixed to the vibrator 22, a flexible circuit board 3 supported on the support frame, and a sensor 5 detecting the movement of the vibrator 22. Wherein, the stator 21 and the vibrator 22 together constitute a drive motor 2.

[0030] Wherein, the first direction is the direction of vibration of the vibrator 22, that is, the direction of displacement of the button 4 when the button 4 is pressed, which is also the Z axis; the second direction described below is the X axis, and the third direction is the Y axis.

[0031] The opposite sides of the support frame 1 are provided with mounting portions 11 respectively extending outwardly, and each mounting portion 11 is provided with a mounting hole 12 therethrough. In this way, the button motor 100 can be mounted to other devices by means of screws or rivets and the like structure passing through the mounting hole 12.

[0032] The stator 21 comprises a magnet group 211 fixed to the support frame 1; the vibrator 22 comprises an iron core 222 fixedly connected with the button 4 and a coil 221 arranged around the iron core 222 and spaced apart from the magnet group 211, and the flexible circuit board 3 is electrically connected with the coil 221.

[0033] In the embodiment, the stator 21 comprises two magnetic steel groups 211 respectively arranged on two sides of the coil 221 along a second direction perpendicular to the first direction, and each magnetic steel group 211 comprises three magnetic steels 2111 fixed to the support frame 1 along the first direction, and each of the three magnetic steels 2111 is magnetized along the second direction, and the magnetization directions of two adjacent magnetic steels 2111 are opposite. Specifically, the magnetization direction of the magnetic steel 2111 in the middle of one of the magnetic steel groups 211 is opposite to the magnetization direction of the magnetic steel 2111 in the middle of the other magnetic steel group 211, and the magnetization direction of the magnetic steel 2111 in the middle of any one of the magnetic steel groups 211 is the same as the magnetization direction of the magnetic steels 2111 on the two sides of the other magnetic steel group 211. Such a design can make the magnetic steel group 211 form a three-section magnetized ESA scheme, so that the change of the tolerance during assembly of the key motor 100 will not affect the driving force, thereby avoiding the experience difference caused by assembly.

[0034] The stator 21 further comprises four cover plates 212 fixed to the inner side of the support frame 1, and each two cover plates 212 are respectively located at the two ends of one magnetic steel group 211.

[0035] The key 4 comprises a main body part 41 arranged opposite to the support frame 1 with a spacing, and a first connecting part 42 and a second connecting part 43 protruding and extending from one side of the main body part 41 close to the vibrator 22, and the first connecting part 42 and the second connecting part 43 respectively extend into the support frame 1 and are respectively fixed to the iron core.

[0036] In addition, the key motor 100 further comprises a guide 9 respectively sleeved on the first connecting part 42 and the second connecting part 43. Such a design can install the guide 9 on the shell of the electronic device to guide the first connecting part 42 and the second connecting part 43.

[0037] The key motor 100 further comprises a non-metallic elastic member 6 clamped between the iron core 222 and the support frame 1, and the non-metallic elastic member 6 can be deformed along the first direction.

[0038] The flexible circuit board 3 comprises a first support section 31 located on the side of the iron core 222 away from the key 4, and a bending section 32 formed by bending and extending upward from one end of the first support section 31, and the two ends of the first support section 31 are respectively fixed to the side of the support frame 1 away from the key 4, the first support section 31 is arranged with a spacing along the first direction from the iron core 222, and the bending section 32 is fixed to the outer side of the support frame 1, and the sensor 5 is fixed to the first support section 31 and arranged with a spacing from the iron core 222.

[0039] In the embodiment, the flexible circuit board 3 further comprises a second supporting section 34 clamped between the first supporting section 31 and the key 4, and a spring arm 33 connecting the second supporting section 34 and the bending section 32; the coil 221 is electrically connected with the second supporting section 34, and the spring arm 33 is arranged opposite to the non-metallic elastic member 6 along the first direction. In this way, the vibrator 22 can drive the flexible circuit board 3 to deform, so that the pressing position and the pressing force can be accurately detected.

[0040] The second supporting section 34 is welded to the iron core 222 at one end away from the spring arm 33 through two spacers 341.

[0041] The middle region of the first supporting section 31 is fixed to one side of the iron core 222 away from the key 4 through the gasket 8, and the sensor 5 is arranged on the side of the first supporting section 31 facing the iron core 222 and spaced apart from the gasket 8. In this way, the flexible circuit board 3 can be fixed to the vibrator 22 and the supporting frame 1 respectively, and the first supporting section 31 and the iron core 222 can be arranged apart along the first direction.

[0042] In the embodiment, the supporting frame 1 comprises first side walls 13 arranged apart along the second direction and second side walls 14 arranged apart along a third direction, the third direction being perpendicular to the first direction and the second direction, the magnetic steel group 211 is fixed to the first side wall 13, and the bending section 32 is fixed to the second side wall 14. Among them, two mounting portions 11 are respectively arranged on two second side walls 14 and respectively extend away from the accommodation space.

[0043] The sensor 5 is used to detect the pressing position and the pressing force of the key 4; the sensor 5 comprises four, and the four sensors 5 are fixed apart on the first supporting section 31 and are spaced apart from the iron core 222.

[0044] In the embodiment, the non-metallic elastic member 6 comprises two, and the two non-metallic elastic members 6 respectively fix the two ends of the iron core 222 to the opposite sides of the supporting frame 1.

[0045] The non-metallic elastic member 6 is made of silica gel or rubber.

[0046] The non-metallic elastic member 6 is in block shape, and the key motor 100 further comprises a connecting member 7 integrally formed with the non-metallic elastic member 6, and the non-metallic elastic member 6 is fixed to the iron core 222 through the connecting member 7.

[0047] The side of the non-metallic elastic member 6 close to the iron core 222 is provided with a groove 61 recessed away from the iron core 222, and the connecting member 7 is formed in the groove 61.

[0048] The key motor 100 in the embodiment is clamped between the iron core 222 and the support frame 1 through the non-metallic elastic piece 6, and the non-metallic elastic piece 6 can be deformed in the first direction, so that the occupied space of the non-metallic elastic piece 6 can be reduced through the non-metallic elastic design, so that the magnetic circuit size of the key motor 100 can be as large as possible in the same size structure, so that the driving force is sufficient.

[0049] As shown in FIGS. 5-6, the application also provides an electronic device 200, which comprises a shell 201 and a key motor 100 as shown in FIGS. 1-4 received in the shell 201, the outer side of the shell 201 is provided with an inwardly recessed receiving groove 202, the groove bottom of the receiving groove 202 is provided with a through hole 203; the support frame 1 is fixed to the inner side of the shell 201, and part of the structure of the key 4 is received in the receiving groove 202 and fixed to the vibrator 22 through the through hole 203.

[0050] Part of the main body of the key 4 is received in the receiving groove 202, and the first connecting part 42 and the second connecting part 43 of the key 4 are fixed to the second support section 34 of the flexible circuit board 3 through the two through holes 203 provided in the receiving groove 202, respectively.

[0051] When the first connecting part 42 and the second connecting part 43 are sleeved with the guide piece 9, the guide piece 9 is fixed in the through hole 203.

[0052] The electronic device 200 is a device that needs button operation scene such as mobile phone, XR, AR, earphone, handle, steering wheel and tablet.

[0053] Since the electronic device 200 in the embodiment contains the key motor 100 in the above-mentioned embodiment one, it can also achieve the technical effects of the key motor 100 in the above-mentioned embodiment one, which will not be repeated here.

[0054] The above is only an embodiment of the application, and it should be pointed out that for those skilled in the art, without departing from the inventive concept, improvements can be made, but these all belong to the protection scope of the application.

Claims

1. A key motor comprising a support frame having a receiving space, a stator received in the receiving space, a vibrator moving in a first direction relative to the stator, a key fixed to the vibrator, a flexible circuit board supported on the support frame, and a sensor detecting movement of the vibrator; characterized in that the stator comprises a magnetic steel set fixed to the support frame; the vibrator comprises an iron core fixedly connected with the key, and a coil wound on the iron core and oppositely spaced from the magnetic steel set, and the flexible circuit board is electrically connected with the coil.

2. The key motor of claim 1, further comprising a non-metallic elastic member clamped between the iron core and the support frame, the non-metallic elastic member being deformable in the first direction.

3. The key motor of claim 2, wherein the non-metallic elastic member is made of silica gel or rubber.

2. The pushbutton motor of claim 1, wherein 4. The key motor of claim 2, wherein the non-metallic elastic member is in a block shape, and the key motor further comprises a connecting member integrally formed with the non-metallic elastic member, the non-metallic elastic member being fixed to the iron core through the connecting member.

3. The pushbutton motor of claim 1, wherein 5. The key motor of claim 4, wherein a side of the non-metallic elastic member close to the iron core is provided with a groove recessed away from the iron core, and the connecting member is formed in the groove.

4. The pushbutton motor of claim 3, wherein 6. The key motor of claim 1, wherein the stator comprises two magnetic steel sets respectively arranged on both sides of the coil in a second direction, the second direction being perpendicular to the first direction, each magnetic steel set comprising three magnetic steels fixedly spaced on the support frame in the first direction, the three magnetic steels being magnetized in the second direction, and magnetization directions of adjacent two magnetic steels being opposite.

5. The pushbutton motor of claim 1, wherein 7. The key motor of claim 1, wherein the flexible circuit board comprises a first support section on a side of the iron core away from the key, and a bent section formed by bending and extending from one end of the first support section, both ends of the first support section being fixed to the support frame, the first support section being spaced from the iron core in the first direction, and the bent section being fixed to the support frame; and the sensor is fixed to the first support section and spaced from the iron core.

6. The pushbutton motor of claim 5, wherein, 8. The key motor of claim 7, wherein the flexible circuit board further comprises a second support section clamped between the iron core and the key, and a spring arm connecting the second support section and the bent section, the coil being electrically connected with the second support section, and the spring arm being oppositely spaced from the non-metallic elastic member in the first direction.

7. The pushbutton motor of claim 6, wherein 9. The key motor of claim 8, wherein a middle region of the first support section is fixed to a side of the iron core away from the key through a gasket, and the sensor is arranged on a side of the first support section facing the iron core and spaced from the gasket.

8. The pushbutton motor of claim 6, wherein, 10. The key motor of claim 1, wherein the support frame comprises a first side wall oppositely spaced in the second direction, and a second side wall oppositely spaced in a third direction, the third direction being perpendicular to the first direction and the second direction, the magnetic steel set being fixed to the first side wall, and the bent section being fixed to the second side wall.

9. The pushbutton motor of claim 6, wherein, 11. An electronic device comprising a housing and the key motor of claim 1 received in the housing, an inner side of the housing being provided with a receiving groove recessed inward, a bottom of the receiving groove being provided with a through hole penetrating therethrough; the support frame being fixed to an inner side of the housing, and part of the key being received in the receiving groove and fixed to the vibrator through the through hole.

10. An electronic device, characterized by ​

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