CN-122026678-A - Linear vibration motor and electronic equipment

Abstract

The present invention relates to a linear vibration motor and an electronic apparatus including the same. The linear vibration motor comprises an upper cover, a vibration unit connected with the upper cover, a driving assembly and two elastic pieces positioned on two sides of the vibration unit and connected with the upper cover. The upper cover is provided with a main body part, a plurality of protruding parts and an extending part, and the width of the main body part is smaller than that of the elastic piece along the second direction. The elastic piece adopts a multi-elastic arm and bending part structure, the first connecting part is fixed with the extending part, and the second connecting part and the third connecting part are respectively connected with the vibration unit, so that the vibration force is uniformly transmitted on two sides of the vibration unit, and stable linear vibration is realized. Through optimizing upper cover structure and elastic component overall arrangement to combine upper cover auxiliary structure, multiple location, damping optimization and magnetic circuit design, effectively reduce the motor volume when guaranteeing vibration performance, improved structural strength, assembly reliability and vibration uniformity, be applicable to the great, ultra-thin electronic equipment of thickness of length and width size.

Inventors

• She Zhizhong
• WU JIE

Assignees

• 瑞声光电科技(常州)有限公司

Dates

Publication Date

20260512

Application Date

20260402

Claims (20)

1. 1. A linear vibration motor comprises an upper cover with an accommodating space, a vibration unit accommodated in the accommodating space and arranged at intervals with the upper cover, a driving assembly for driving the vibration unit to vibrate along a first direction, and two elastic pieces connected with the vibration unit and the upper cover, wherein the two elastic pieces are respectively positioned at two sides of the vibration unit along the first direction; It is characterized in that the method comprises the steps of, The upper cover comprises a flat plate-shaped main body part, wherein the main body part comprises a first side and a second side which are parallel to the first direction, and a third side and a fourth side which are respectively connected with the first side and the second side; in the plane vibrated by the vibration unit, the direction perpendicular to the first direction is a second direction, and the direction perpendicular to the first direction and the direction perpendicular to the second direction is a third direction; The upper cover further comprises a first protruding part and a second protruding part which extend from the first edge to a direction far away from the main body part and are mutually spaced, and a third protruding part and a fourth protruding part which extend from the second edge to a direction far away from the main body part and are mutually spaced, wherein the first protruding part and the third protruding part are close to the third edge, and the second protruding part and the fourth protruding part are close to the fourth edge; The upper cover further comprises two extension parts which are respectively formed by extending from the third side and the fourth side to the direction approaching the elastic piece; Each elastic piece comprises a first connecting part fixedly connected with the extending part, a first elastic arm, a first bending part, a second elastic arm, a second bending part and a second elastic arm, wherein the first elastic arm is formed by extending from one end of the first connecting part close to the first side to the direction close to the first side, the first bending part is formed by extending from one end of the first elastic arm far away from the first connecting part to the direction close to the first connecting part, the second bending part is formed by extending from one end of the first bending part far away from the first elastic arm to the direction close to the second side, the second connecting part is formed by extending from one end of the second elastic arm far away from the first bending part to the direction close to the second side, and the fourth elastic arm is formed by extending from one end of the first connecting part close to the second side to the first bending part; the second connecting part and the third connecting part are respectively and fixedly connected with the vibration unit; The width of the extension part along the second direction is smaller than or equal to the width of the first connection part along the second direction.
2. 2. The linear vibration motor according to claim 1, wherein each of the extending portions includes a first extending portion directly connected to the main body portion and a second extending portion formed by bending from the first extending portion in a direction away from the upper cover in the third direction, the second extending portion being fixedly connected to the first connecting portion.
3. 3. The linear vibration motor of claim 1, wherein the elastic member has an axis of symmetry parallel to the first direction.
4. 4. The linear vibration motor of claim 1, wherein the first, second, third, and fourth elastic arms have a uniform thickness in the third direction.
5. 5. The linear vibration motor according to claim 2, wherein the second connecting portion and the third connecting portion each include a notch portion recessed from a side close to the upper cover in the third direction toward a direction away from the upper cover, the second connecting portion includes a first side wall forming the notch portion, the third connecting portion includes a second side wall forming the notch portion, and the first extending portion is located between the first side wall and the second side wall in the second direction.
6. 6. The linear vibration motor according to claim 2, wherein the second extension portion is located on a side of the first connection portion near the main body portion.
7. 7. The linear vibration motor according to claim 2, wherein the second extension portion is located on a side of the first connection portion remote from the main body portion.
8. 8. The linear vibration motor according to claim 2, further comprising a first tab disposed opposite to the second extension portion and sandwiching and fixing the first connection portion together with the second extension portion.
9. 9. The linear vibration motor according to claim 2, wherein a width of the second extension portion in the second direction coincides with a width of the first connection portion in the second direction.
10. 10. The linear vibration motor according to claim 1, wherein the vibration unit includes a mass having a central opening therethrough and driving magnetic steel embedded in the opening, the mass being connected to the second and third connecting portions.
11. 11. The linear vibration motor according to claim 10, further comprising a second lug and a third lug for connecting the elastic member and the mass, the second connecting portion and the third connecting portion each being sandwiched between the second lug and the third lug, the second lug being located on a side of the third lug away from the vibration unit in the first direction.
12. 12. The linear vibration motor according to claim 11, wherein the mass has intermediate protruding portions provided on both side edges connected to the second connecting portion and the third connecting portion, and a width of the intermediate protruding portions in the second direction is identical to a width of the second tab and the third tab.
13. 13. The linear vibration motor according to claim 12, wherein the mass has recesses on the other two sides adjacent to the two sides provided with the middle protruding portion, the recesses including a first recess and a second recess provided at an interval from the first recess, and four limit stops fixed to the first protruding portion, the second protruding portion, the third protruding portion, and the fourth protruding portion, respectively, the first recess and the second recess being provided in cooperation with the limit stops.
14. 14. The linear vibration motor according to claim 1, wherein a thickness of the linear vibration motor in the third direction ranges from 1.2 mm to 2 mm.
15. 15. The linear vibration motor according to claim 1, wherein the linear vibration motor has a length L in the first direction, a width W in the second direction, and a thickness H in the third direction, satisfying the following relational expressions 7.5< L/H <12.5,10< W/H <16.7.
16. 16. The linear vibration motor according to claim 1, wherein a width W1 of the elastic member in the second direction and a width W2 of the first connecting portion in the second direction satisfy the following relation 3< W1/W2<6.
17. 17. The linear vibration motor according to claim 1, wherein the length of the first connecting portion in the first direction in a stationary state of the second connecting portion and the third connecting portion is L1, and the length of one end of the first elastic arm and the second elastic arm connected to the first bending portion in the first direction is L2, satisfying the following relation 1.2< L1/L2<2.
18. 18. The linear vibration motor of claim 1, wherein the first connecting portion includes a first sub-connecting portion and a second sub-connecting portion disposed at an opposite interval from the first sub-connecting portion in the second direction.
19. 19. The linear vibration motor according to claim 1, wherein the upper cover further includes four auxiliary extensions extending from the third side and the fourth side in a direction approaching the elastic member, the four auxiliary extensions being provided at four corners of the linear vibration motor, respectively, each of the auxiliary extensions including a first auxiliary extension directly connected to the main body portion and a second auxiliary extension bent from an end of the first auxiliary extension away from the main body portion in the third direction toward a direction away from the upper cover, the second auxiliary extension being spaced apart from the elastic member and located at a side of the elastic member away from the vibration unit.
20. 20. The linear vibration motor of claim 19, wherein each of the auxiliary extensions includes a relief through hole corresponding to the first bent portion or the second bent portion in the third direction.

Description

Linear vibration motor and electronic equipment Technical Field The invention relates to the technical field of linear vibration motors, in particular to a linear vibration motor and electronic equipment comprising the same. Background With the rapid development of mobile communication technology and consumer electronics market, electronic products such as smart phones and smart wearable devices are evolving towards ultra-thin and lightweight directions. The linear vibration motor has become a core device for providing haptic feedback in various portable electronic terminals due to the advantages of fast start-stop speed, fine vibration feeling, long service life and the like. However, in the existing linear vibration motor design, the conventional spring structure, such as a simple bending structure, often has a long force arm, and the long force arm structure cannot reach the expected vibration frequency. In order to raise the vibration frequency to more than 220Hz to meet the touch demand, the prior art generally shortens the force arm to raise the vibration frequency, increases the thickness of the spring material to raise the rigidity of the spring material, and although the frequency is raised, the high internal stress generated by the frequency is easy to cause fatigue fracture, so that the service life of a motor is obviously shortened, and meanwhile, the ultra-thin design of equipment is also not facilitated. In addition, for an application scene where the length and width dimensions are large but the thickness is extremely thin, such as an ultrathin notebook computer, the linear vibration motor is extremely limited in the thickness direction. Existing linear vibration motors typically employ fully-covered housing structures to form a closed housing space. While this conventional structure provides protection for the internal components, its wall thickness and side walls occupy a large amount of space, resulting in difficulty in maintaining a sufficient vibration output while reducing the overall size. In order to alleviate the contradiction between frequency and service life, part of the existing schemes adopt spring structures with complex geometric shapes, but the structures cannot be formed by single stamping, or the number of springs needs to be increased, so that the production cost is high, the assembly is complex, and the mass production is not facilitated. Therefore, it is necessary to provide a new linear vibration motor structure that breaks the limitations of the conventional case structure by optimizing the upper cover, the elastic member and the connection manner thereof, and adopts an improved elastic member design, thereby realizing high frequency vibration while reducing the material thickness, reducing the fatigue stress and prolonging the life, and maintaining a simple structure and easy assembly to overcome the defects in the prior art. Disclosure of Invention The invention provides a novel linear vibration motor and electronic equipment, which realize stable linear vibration of a vibration unit and uniform transmission of vibration force by optimizing the layout of an upper cover structure and a multi-elastic arm elastic piece, effectively reduce the whole volume while guaranteeing the vibration performance, improve the structural strength and the assembly reliability, and are suitable for ultrathin electronic equipment. In order to achieve the above purpose, the technical scheme of the invention is that the linear vibration motor comprises an upper cover with an accommodating space, a vibration unit accommodated in the accommodating space and arranged at intervals with the upper cover, a driving assembly for driving the vibration unit to vibrate along a first direction, and two elastic pieces connected with the vibration unit and the upper cover, wherein the two elastic pieces are respectively positioned at two sides of the vibration unit along the first direction; the upper cover comprises a flat plate-shaped main body part, wherein the main body part comprises a first side and a second side which are parallel to the first direction, and a third side and a fourth side which are respectively connected with the first side and the second side; the upper cover further comprises a first bulge part and a second bulge part which extend from the first edge to the direction far from the main body part and are mutually spaced, a third bulge part and a fourth bulge part which extend from the second edge to the direction far from the main body part and are mutually spaced, wherein the direction perpendicular to the first direction is perpendicular to the first direction and the direction perpendicular to the second direction is perpendicular to the third edge, the width of the main body part along the second direction is smaller than the width of the elastic piece along the second direction, the upper cover further comprises two extending parts which are respectively formed by extending