Ultra-thin linear vibration motor and electronic equipment

Abstract

The utility model relates to the technical field of vibration motors, and discloses an ultra-thin linear vibration motor and electronic equipment, and the linear vibration motor comprises a square housing with an accommodation space, and a vibrator assembly and a stator assembly which are horizontally arranged side by side and are accommodated in the accommodation space at intervals. The elastic pieces are arranged on the left side and the right side of the vibrator assembly and support the vibrator assembly in the accommodating space; the oscillator assembly comprises a mass block with a mounting groove in the center, a flexible circuit board and a support which are fixed to the two sides of the mass block in the thickness direction respectively, and a coil fixed to the support in a matched mode. The stator assembly comprises cuboid first magnetic steel and cuboid second magnetic steel. The first magnetic steels surround the coil at intervals, and the second magnetic steels are arranged at two sides of the coil at intervals; the coil, the first magnetic steel and the second magnetic steel are horizontally arranged in the containing space side by side in the long edge direction of the support, and the distances between the coils, the first magnetic steel and the second magnetic steel are equal. The vibration motor is simple in structure, and the installation height of the vibration motor in light and thin electronic equipment is effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of tactile feedback of electronic equipment, in particular to an ultra-thin linear vibration motor and electronic equipment. Background Art

[0002] With the advancement of electronic technology, portable consumer electronics, such as tablet computers, mobile phones, handheld game consoles, and multimedia entertainment devices, have gradually taken over the global consumer market. These widely used electronic products generally use vibration motors for tactile feedback, such as the vibration feedback of tablet computers. To meet the needs of these increasingly thin electronic products, the use of linear vibration motors is becoming increasingly common.

[0003] Existing linear vibration motors usually have horizontal linear vibration motors, including a vibrator assembly with a mass block accommodating a magnetic steel, and a stator assembly with a coil and a flexible circuit board. The vibrator assembly and the stator assembly are arranged with an upper and lower interval, and the coil corresponds to the magnetic steel in the upper and lower directions. According to the principle of electromagnetic induction, a magnetic field is generated by energizing the coil, and an alternating driving force is generated by alternately changing the direction of the current in the coil, driving the vibrator assembly equipped with the magnetic steel to perform reciprocating cyclic motion. When the alternating frequency is equivalent to the natural frequency of the motor itself, a resonance effect is generated. However, the upper and lower interval arrangement structure of the vibrator assembly and the stator assembly cannot solve the problem of space utilization of the horizontal linear vibration motor in the limited vertical direction of electronic products. At the same time, in order to generate sufficient driving force between the coil and the magnetic steel, the magnetic circuit design of the horizontal linear vibration motor in the related art requires a certain thickness of space. This makes it impossible to reduce the height of the existing horizontal linear vibration motor product and cannot meet the common development trend of lightweight and thin electronic products. Therefore, it is necessary to provide a new horizontal linear vibration motor to solve the above problems. Utility Model Content

[0004] In view of the above problems, the present invention proposes an ultra-thin linear vibration motor and an electronic device with a simple structure and good vibration performance.

[0005] To achieve the above-mentioned purpose, the present invention proposes, on the one hand, an ultra-thin linear vibration motor, comprising a square shell with an accommodating space, a vibrator assembly and a stator assembly horizontally side by side and accommodated at intervals in the accommodating space, and an elastic member arranged on the left and right sides of the vibrator assembly and supporting it in the accommodating space; the vibrator assembly comprises a mass block with a mounting slot in the center, a flexible circuit board and a bracket respectively fixed on both sides of the thickness direction of the mass block, and a coil adapted to be fixed to the bracket; the stator assembly comprises a first and a second rectangular magnet; the first magnet is spaced around the coil, and the second magnet is spaced at intervals on both sides of the coil; the coil, the first magnet and the second magnet are all horizontally side by side in the accommodating space along the long side direction of the bracket and the spacing between them is equal; one end of the elastic member is connected to and fixed to the mass block, and the other end is connected to and fixed to the shell to support the horizontal reciprocating motion of the vibrator assembly.

[0006] Preferably, the first magnet is configured to be segmented magnetized, and the upper and lower magnetic poles of the first magnet along its left and right sides are opposite; the magnetic pole on the left side of the first magnet is the same as the magnetic pole of the second magnet on its left side, and the magnetic pole on the right side of the first magnet is the same as the magnetic pole of the second magnet on its right side.

[0007] Preferably, the mass block and the mounting groove are both square in shape, and the mass block is provided with a first groove and a second groove adapted to the flexible circuit board and the bracket on both sides in the thickness direction thereof.

[0008] Preferably, the bracket is a thin sheet-like rectangular frame, and the center of the frame is a rectangular clearance hole, the clearance hole forms the long side and short side of the relative sides of the bracket, the short side is fixed on the mass block, and the long side is located in the mounting groove and is adapted and fixed to the coil.

[0009] Preferably, the housing includes an upper cover plate and a lower cover plate clamped and fixed to the upper and lower sides of the stator assembly, and a middle frame connected to the vibrator assembly. The upper cover plate, the lower cover plate and the middle frame are arranged to form the accommodating space.

[0010] Preferably, the first magnetic steel and the second magnetic steel are both clamped and fixed by the upper cover plate and the lower cover plate.

[0011] Preferably, through-hole slots are provided on the upper cover plate and the lower cover plate at positions corresponding to the center lines of the coils along the long sides.

[0012] Preferably, one end of the elastic member is connected to and fixed to the mass block, and the other end is connected to and fixed to the middle frame.

[0013] Preferably, the first magnetic steels are two horizontally spaced apart, and the upper and lower magnetic poles of the first magnetic steels on the left and right sides are opposite; the magnetic poles of the first magnetic steel on the left and the second magnetic steel are the same, and the magnetic poles of the first magnetic steel on the right and the second magnetic steel are the same.

[0014] A second aspect of the present invention provides an electronic device, comprising the ultra-thin linear vibration motor as described in any one of the above items.

[0015] Compared with the prior art, the ultra-thin linear vibration motor provided by the present invention has a vibrator assembly with a coil and a stator assembly containing a magnet arranged on the same horizontal plane, and the coil and the magnet are arranged horizontally with the same spacing. When the coil is energized, it interacts with the magnet to generate a horizontal driving force. The structure of the vibration motor of the present invention is simple, compact and easy to assemble, which reduces the height of the linear vibration motor, making it better suitable for lighter and thinner electronic devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is an assembly perspective view of the first embodiment.

[0017] Figure 2 It is a bottom plan view of the first embodiment without the lower cover.

[0018] Figure 3 This is a perspective view of the bracket according to the first embodiment.

[0019] Figure 4 It is a cross-sectional view taken along the X-axis of the first embodiment.

[0020] Figure 5 Schematic diagram of the magnetic lines of force of the housing, coil, and magnet in the first embodiment.

[0021] Figure 6 It is an exploded view of the structure of the second embodiment.

[0022] Figure 7 2 is a schematic diagram of the assembly of the middle frame, elastic member and vibrator assembly of the second embodiment.

[0023] Figure 8 It is an exploded view of the structure of the vibrator assembly according to the third embodiment.

[0024] Figure 9 It is a perspective plan view of a mass block according to the third embodiment.

[0025] in:

[0026] 1-housing; 10-upper cover; 11-lower cover; 12-middle frame; 100-through hole slot; 110-opening;

[0027] 2-vibrator assembly; 20-mass block; 200-mounting slot; 201-first groove; 202-second groove;

[0028] 21-bracket; 210-through hole; 211-short side; 212-long side; 22-coil; 23-flexible circuit board;

[0029] 3-stator assembly; 30-first magnetic steel; 31-second magnetic steel;

[0030] 4- Elastic parts. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The first embodiment of the ultra-thin linear vibration motor provided by the first aspect of the utility model has a structure as follows Figures 1 to 5 As shown, it includes a square housing 1 with an accommodating space, a vibrator assembly 2 and a stator assembly 3 horizontally arranged side by side and spaced apart in the accommodating space, and elastic members 4 provided on the left and right sides of the vibrator assembly 2 and supporting it in the accommodating space. One end of the elastic member 4 is connected to a fixed mass block 20 and the other end is connected to the fixed housing 1 to support the horizontal reciprocating motion of the vibrator assembly 2 in the accommodating space. The spacing between the coil 22, the first magnetic steel 30 and the second magnetic steel 31 is used to provide displacement space for the horizontal reciprocating motion of the vibrator assembly 2; the housing 1 is made of magnetic conductive material and includes an upper cover plate 10 and a lower cover plate 11 clamped and fixed on the upper and lower sides of the stator assembly 3, and a middle frame 12 elastically connected to the vibrator assembly 2. The upper cover plate 10, the lower cover plate 11 and the middle frame 12 are arranged to form an accommodating space; in the embodiment of the utility model, the X direction is the horizontal short side and vibration direction of the bracket 21, the Y direction is the horizontal long side direction of the bracket 21, and the Z direction is the vertical height direction of the vibration motor. The side close to the flexible circuit board 23 is the bottom of the vibration motor, and the opposite side is the top of the vibration motor.

[0033] The vibrator assembly 2 includes a mass block 20 with a mounting groove 200 in the center, a flexible circuit board 23 and a bracket 21 fixed to both sides of the mass block 20 in the thickness direction, and a coil 22 adapted to be fixed to the bracket 21. The mass block 20 and the mounting groove 200 are both square in shape. The mass block 20 is provided with a first groove 201 and a second groove 202 on both sides of its thickness direction, which are adapted to the flexible circuit board 23 and the bracket 21. The bracket 21 is a horizontally arranged thin sheet-like rectangular frame with a rectangular hole 210 in the center of the frame. The paving holes form the short sides 211 and long sides 212 of the opposite sides of the bracket, the short sides 211 of the paving holes 201 are fixed in the second groove 202 of the mass block 20, and the long sides 212 of the paving holes 210 are located in the mounting groove 200 and are adapted and fixed to the coil 22; the flexible circuit board 23 is fixed in the first groove 201; one end of the elastic member 4 is connected to the fixed mass block 20, and the other end is connected to the fixed middle frame 12. In this embodiment, the V-shaped elastic members 4 on both sides of the mass block 20 are respectively set to one.

[0034] The stator assembly 3 includes a first magnetic steel 30 and a second magnetic steel 31 in a rectangular shape; the first magnetic steel 30 and the second magnetic steel 31 are clamped and fixed by the upper cover plate 10 and the lower cover plate 11; the first magnetic steel 30 is configured to be segmented magnetized, and the upper and lower magnetic poles of the first magnetic steel 30 along its left and right sides are opposite; the magnetic pole on the left side of the first magnetic steel 30 is the same as the magnetic pole of the second magnetic steel 31 on its left side, and the magnetic pole on the right side of the first magnetic steel 30 is the same as the magnetic pole of the second magnetic steel 31 on its right side.

[0035] The assembled vibration motor is as follows Figure 4 As shown, the first magnetic steel 30 is spaced around the coil 22, and the second magnetic steel 31 is spaced on both sides of the coil 22; wherein, preferably, the width of the long side 212 is equal to the width of the coil 22 to ensure that the displacement space is effective and uniform, and to prevent the bracket 21 from hitting the first magnetic steel 30 and the second magnetic steel 31 during the reciprocating motion of the vibrator assembly 2, causing the first magnetic steel 30 and the second magnetic steel 31 to loosen, reduce the performance of the vibration motor, and generate noise; the first magnetic steel 30 passes through the clearance hole 210 and is tightly fixed to the upper cover 10 and the lower cover 11; the coil 22, the first magnetic steel 30 and the second magnetic steel 31 are all horizontally arranged side by side along the long side direction of the bracket 21. The spacing between the coils 22, the first magnetic steel 30 and the second magnetic steel 31 is equal to ensure uniform distribution of magnetic lines of force, wherein the length direction of the coil 22, the first magnetic steel 30 and the second magnetic steel 31 is perpendicular to the vibration direction; the mounting groove 220 of the mass block 20 not only provides space for accommodating the coil 22, the first magnetic steel 30 and the second magnetic steel 31, but also provides displacement space so that the coil 22 will not collide with the first magnetic steel 30 and the second magnetic steel 31 during the reciprocating motion of the vibrator assembly 2. The spacing between the long side of the second magnetic steel 31 and the mass block 20 is equal to the distance between the coil 22 and the long sides of the first magnetic steel 30 and the second magnetic steel 31, respectively, to ensure the balance of the vibration motor and improve the vibration performance.

[0036] The magnetic field lines of the vibration motor are shown in the figure below: Figure 5 As shown, through the magnetic field action of the first magnet 30 and the second magnet 31 of the stator assembly 3, when the current in the coil 22 is vertically downward, the coil 22 will generate a leftward driving force. By alternately changing the direction of the current in the coil 22, the coil 22 is energized to generate a horizontal left and right reciprocating driving force, thereby driving the vibrator assembly 2 fixed to the coil 22 to perform horizontal reciprocating motion. At the same time, the magnetic conductive shell 1 plays a role in gathering the magnetic field to prevent magnetic leakage, thereby improving the vibration performance.

[0037] The second embodiment of the ultra-thin linear vibration motor provided by the first aspect of the utility model has a structure as follows Figure 6 and Figure 7 As shown, on the basis of the first embodiment, in order to increase the driving force of the vibration motor, the coil 22 inside the vibration motor and the corresponding first magnetic steel 30 and second magnetic steel 31 are expanded and arranged in an array; wherein, the bracket 21 is set as one, and the number of its long sides 212 and the width of its short sides 211 are adapted to the number of coils 22 to ensure that each coil 22 can be effectively fixed, and accordingly, the second groove 202 of the mass block 20 adapted to the bracket 21 is one; in order to cope with a larger vibration amount, the V-shaped elastic members 4 on both sides of the mass block 20 are respectively set to two. Since each elastic member 4 can independently withstand a part of the vibration force, the total force of the vibration on one side of the mass block 20 can be dispersed to the two elastic members 4, thereby. The four elastic members 4 on both sides of the mass block 20 disperse and balance the forces to adapt to different vibration frequencies and amplitudes, reduce the stress borne by each elastic member 4, avoid the defect of short service life of the elastic member 4 due to its own fatigue and other problems, and improve the vibration performance and reliability of the vibration motor; one end of the elastic member 4 is welded and fixed to the mass block 20. In the limited Z-direction space, in order to avoid the solder protrusion (not shown) caused by the welding process from colliding or rubbing with the upper cover plate 10 and the lower cover plate 11 during the reciprocating movement of the vibrator assembly 2, the upper cover plate 10 and the lower cover plate 11 are provided with an opening 110 passing through the upper cover plate 10 and the lower cover plate 11 corresponding to the welding position to avoid the protrusion, thereby ensuring the connection strength between the elastic member 4 and the mass block 20 and ensuring the vibration performance.

[0038] The third embodiment of the ultra-thin linear vibration motor provided by the first aspect of the present invention has a structure as follows: Figure 8 and Figure 9 As shown, as an alternative to the second embodiment, the bracket 21 is set separately to save materials and reduce costs. The number of brackets 21 is consistent with the number of coils 22; the second grooves 202 of the mass block 20 are adapted to the number of brackets 21.

[0039] The fourth embodiment of the ultra-thin linear vibration motor provided by the first aspect of the present invention has the following structure: Figure 6 As shown, on the basis of the second embodiment, the upper cover plate 10 and the lower cover plate 11 are provided with through-hole grooves 100 corresponding to the center line positions of the coils 22 on the long sides of the bracket 21 to form a magnetic circuit gap, so as to reduce eddy current loss and prevent magnetic saturation, thereby improving the magnetic field strength and the stability of the vibration motor.

[0040] The structure of the fifth embodiment of the ultra-thin linear vibration motor provided by the first aspect of the present invention is not shown in the figure. As an alternative to the first embodiment, the first magnetic steel 30 is set to two horizontally spaced apart to reduce the processing difficulty and save materials. The upper and lower magnetic poles of the first magnetic steel 30 on the left and right sides are opposite; the magnetic poles of the first magnetic steel 30 on the left and the second magnetic steel 31 are the same, and the magnetic poles of the first magnetic steel 30 on the right and the second magnetic steel 31 are the same.

[0041] The second aspect of the present invention provides an electronic device (not shown), including the ultra-thin linear vibration motor provided by the first aspect of the present invention. In particular, under the trend of ultra-thin development of portable tablets or laptop computers, the ultra-thin linear vibration motor provided by the present invention can achieve a larger vibration amount by correspondingly increasing the number of arrays of coils 22, first magnetic steels 30 and second magnetic steels 31 in the vibrator assembly 2 and the stator assembly 3. By increasing the dimensions of the vibration motor in the X and Y directions, the thinnest dimension of the vibration motor in the Z direction is achieved.

[0042] The assembly steps of the ultra-thin linear vibration motor of this utility model are as follows:

[0043] First, a bracket 21 and a flexible circuit board 23 are fixed to the upper and lower sides of the mass block 20, and the coil 22 is bonded and fixed to the bracket 21 to complete the vibrator assembly 2.

[0044] Then, the first magnetic steel 30 and the second magnetic steel 31 are fixed in parallel and spaced apart on the upper cover plate 10 or the lower cover plate 11, thereby completing the fixing of the stator assembly 3 and the upper cover plate 10 or the lower cover plate 11;

[0045] Next, the vibrator assembly 2 and the middle frame 12 are connected and fixed via the elastic member 4 , and the upper cover 10 or the lower cover 11 with the first magnetic steel 30 and the second magnetic steel 31 fixed thereto are adapted and fixed so that the first magnetic steel 30 and the second magnetic steel 31 are inserted toward the coil 22 and are in the same plane.

[0046] Finally, the lower cover plate 11 or the upper cover plate 10 is adapted and fixed to complete the vibration motor.

[0047] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "horizontal direction", "vertical direction", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as a limitation on the present invention.

[0048] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ultra-thin linear vibration motor, characterized in that: It includes a square shell with an accommodating space, a vibrator assembly and a stator assembly horizontally side by side and accommodated at intervals in the accommodating space, and an elastic member arranged on the left and right sides of the vibrator assembly and supporting it in the accommodating space; the vibrator assembly includes a mass block with a mounting slot in the center, a flexible circuit board and a bracket respectively fixed on both sides of the thickness direction of the mass block, and a coil adapted to be fixed to the bracket; the stator assembly includes a first and second rectangular magnet; the first magnet is spaced around the coil, and the second magnet is spaced at both sides of the coil; the coil, the first magnet and the second magnet are all horizontally side by side in the accommodating space along the long side direction of the bracket and the spacing between them is equal; one end of the elastic member is connected to and fixed to the mass block, and the other end is connected to and fixed to the shell to support the horizontal reciprocating motion of the vibrator assembly.

2. The ultra-thin linear vibration motor according to claim 1, characterized in that: The first magnet is configured to be segmented magnetized, and the upper and lower magnetic poles of the first magnet along its left and right sides are opposite; the magnetic pole on the left side of the first magnet is the same as the magnetic pole of the second magnet on its left side, and the magnetic pole on the right side of the first magnet is the same as the magnetic pole of the second magnet on its right side.

3. The ultra-thin linear vibration motor according to claim 2, characterized in that: The mass block and the mounting groove are both square in shape. The mass block is provided with a first groove and a second groove adapted to the flexible circuit board and the bracket on both sides in the thickness direction thereof.

4. The ultra-thin linear vibration motor according to claim 3, characterized in that: The bracket is a thin rectangular frame with a rectangular clearance hole in the center. The clearance hole forms the long side and short side of the bracket on both sides. The short side is fixed on the mass block, and the long side is located in the mounting groove and is adapted and fixed to the coil.

5. The ultra-thin linear vibration motor according to claim 4, characterized in that: The housing includes an upper cover plate and a lower cover plate clamped and fixed on the upper and lower sides of the stator assembly, and a middle frame connected to the vibrator assembly. The upper cover plate, the lower cover plate and the middle frame are arranged to form the accommodating space.

6. The ultra-thin linear vibration motor according to claim 5, characterized in that: The first magnetic steel and the second magnetic steel are both clamped and fixed by the upper cover plate and the lower cover plate.

7. The ultra-thin linear vibration motor according to claim 6, characterized in that: The upper cover plate and the lower cover plate are both provided with through hole slots corresponding to the center line positions of the coils along the long sides.

8. The ultra-thin linear vibration motor according to claim 7, characterized in that: One end of the elastic member is connected to and fixed on the mass block, and the other end is connected to and fixed on the middle frame.

9. The ultra-thin linear vibration motor according to claim 1, wherein: There are two first magnetic steels arranged horizontally at intervals, and the upper and lower magnetic poles of the first magnetic steels on the left and right sides are opposite; the magnetic poles of the first magnetic steel on the left and the second magnetic steel are the same, and the magnetic poles of the first magnetic steel on the right and the second magnetic steel are the same.

10. An electronic device, characterized in that: The ultra-thin linear vibration motor comprises the ultra-thin linear vibration motor according to any one of claims 1 to 9.

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