Linear motor

Abstract

The present invention includes a casing, a vibrator assembly housed within the casing, and an elastic support. The elastic support is provided on both sides of the vibrator assembly in the vibration direction and includes a first fixing portion connected to the casing, a second fixing portion connected to the vibrator assembly, and a central connecting portion. A welding sheet is provided on the outer surface of the second fixing portion. The welding sheet has two first side edges that are parallel to each other and extend in the vibration direction, and a second side edge and an arc edge that connect the two first side edges. The arc edge is closer to the connecting portion than the second side edge and protrudes in a direction away from the second side edge. In the linear motor of the present invention, the arc structure of the edges of the welding sheet improves stress distribution in the elastic support and extends the product life.

Description

[Technical Field]

[0001] The present invention relates to a linear motor, and more particularly to a linear motor used in the field of mobile electronic products. [Background technology]

[0002] With the development of electronic technology, there is an increasing demand for mobile electronic products that use linear motors for system vibration feedback, such as incoming call notifications, message notifications, game vibration feedback, etc. Such a wide range of applications requires vibration motors with excellent performance and long life.

[0003] A conventional linear motor includes a casing, a vibrator housed in the casing, a stator, and an elastic support, the vibrator including a mass block and a magnetic circuit system, and the elastic support is fixed to the mass block by a welding sheet to support the reciprocating motion of the vibrator. However, the welding sheet in the related art is usually rectangular or chamfered, so that the stress of the elastic support to which it is welded is concentrated at a few vertices, which causes the elastic support to be easily fatigued and wear out quickly.

[0004] Therefore, it is necessary to provide a new linear motor to solve the above technical problems. Summary of the Invention

[0005] To solve the above problems, the present invention provides a linear motor that improves the stress distribution of the elastic support and increases the lifespan of the product.

[0006] In order to achieve the above object, the technical means of the present invention are as follows. The vibrator assembly includes a casing having an accommodation space, a vibrator assembly accommodated in the casing, and a pair of elastic supports fixed to the casing and provided on both sides of the vibrator assembly in a vibration direction, The elastic support includes a first fixed portion connected to the casing, a second fixed portion connected to the vibrator assembly, and a connecting portion connecting the first fixed portion and the second fixed portion, and a welding sheet is provided on the outer surface of the second fixed portion, and the welding sheet includes two first side edges that are parallel to each other and extend in the vibration direction, and a second side edge and an arc edge that connect the two first side edges, and the arc edge is closer to the connecting portion than the second side edge, and the arc edge protrudes in a direction away from the second side edge.

[0007] Preferably, the second side edge is perpendicular to the vibration direction.

[0008] Preferably, it is symmetrical along the central axis of the second side edge.

[0009] Preferably, the first side edge and the second side edge are flush with an edge of the second fixing portion.

[0010] Preferably, the vibrator assembly includes a mass block having a mounting cavity and a magnetic circuit structure disposed in the mounting cavity, the mass block having a fixing protrusion fixed to the second fixing portion, and the shape of the fixing protrusion matches the shape of the welding sheet.

[0011] Preferably, foam damping is provided between the connection and the mass block.

[0012] Preferably, the casing includes an upper cover and a lower cover arranged opposite to each other, and a stator assembly for driving the vibrator assembly to vibrate and a position limiting block for limiting movement of the vibrator assembly along the vibration direction are fixed to the lower cover. [Effects of the Invention]

[0013] The advantageous effects of the present invention are as follows: In this linear motor, the welding sheet that fixedly connects the elastic support and the vibrator assembly includes two first side edges that are arranged parallel to each other and extend along the vibration direction, a second side edge that connects the two first side edges, and an arc edge, the arc edge is closer to the connection part of the elastic support than the second side edge, and the arc edge protrudes in a direction away from the second side edge, and by providing the arc edge, the stress distribution of the elastic support is improved, wear of the elastic support is improved, and the life of the elastic support is increased. [Brief explanation of the drawings]

[0014] In order to more clearly describe the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below. It should be noted that the drawings in the following description are only some examples of the present invention, and those skilled in the art can obtain other drawings based on these drawings without any creative work. [Figure 1] FIG. 1 is a perspective view of a linear motor according to the present invention. [Figure 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Figure 3] 1 is an exploded view of a linear motor according to the present invention; [Figure 4] FIG. 2 is a perspective view of the elastic support and welding sheet of the linear motor of the present invention. [Figure 5] FIG. 2 is a perspective view of the linear motor of the present invention after the top cover is removed. DETAILED DESCRIPTION OF THE INVENTION

[0015] The technical means of the present invention will be described clearly and in detail below with reference to the accompanying drawings.

[0016] As shown in FIGS. 1 to 5, the present invention provides a linear motor 100, which includes a casing 1 having an accommodation space 13, a vibrator assembly 2 accommodated in the casing 1, a pair of elastic supports 3 fixed to the casing 1 and provided symmetrically about the center on both sides of the vibrator assembly 2 along a vibration direction X, and a stator assembly 4 fixed to the casing 1 and driving the vibrator assembly 2 to vibrate.

[0017] The casing 1 includes an upper cover 11 and a lower cover 12 that are provided to face each other, and the stator assembly 4 is fixed to the lower cover 12.

[0018] The vibrator assembly 2 includes a mass block 21 having a mounting cavity 211, and a magnetic circuit structure 22 disposed in the mounting cavity 211, the magnetic circuit structure 22 including a magnetic conductive plate 222 fixed to the mass block 21, and a magnetic steel 221 fixed to the magnetic conductive plate 222, the magnetic conductive plate 222 being used to converge the magnetic field lines of the magnetic steel 221, thereby improving the magnetic field performance of the linear motor 100.

[0019] The elastic support 3 includes a first fixing portion 31 connected to the casing 1, a second fixing portion 32 connected to the mass block 21, and a connection portion 33 connecting the first fixing portion 31 and the second fixing portion 32, and a welding sheet 5 is provided on the outer surface of the second fixing portion 33.

[0020] The stator assembly 4 includes an iron core 42 provided corresponding to the magnetic steel 221, a coil 41 wound around the iron core 42, and a flexible circuit board 43 fixed to the bottom cover 12 and electrically connected to the coil 41. When the coil 41 is energized, it interacts with the magnetic steel 221, causing the elastic support 3 to reciprocate the mass block 21 in the vibration direction X in conjunction with the coil 41, thereby providing a vibration sensation.

[0021] As shown in FIG. 4 , the welding sheet 5 includes two first side edges 51 that are parallel to each other and extend along the vibration direction X, a second side edge 52 that connects the two first side edges 51, and an arc-shaped edge 53, the arc-shaped edge 53 being closer to the connection portion 33 than the second side edge 52, and the arc-shaped edge 53 protrudes away from the second side edge 52, the second side edge 52 being perpendicular to the vibration direction X, the arc-shaped edge 53 being symmetrical along the central axis of the second side edge 52, and the first side edge 51 and the second side edge 52 being flush with the edge of the second fixing portion 32.

[0022] Furthermore, as shown in FIG. 3, the mass block 21 is provided with a fixing protrusion 212 that is fixed to the second fixing portion 32, and the shape of the fixing protrusion 212 matches the shape of the welding sheet 5, so that the force is evenly applied when the second fixing portion 33 of the elastic support 3 and the mass block 21 are fixed to each other.

[0023] Furthermore, as shown in FIG. 2, foam damping 6 is provided between the connecting portion 33 of the elastic support 3 and the mass block 21 to prevent noise from being generated due to collision between the connecting portion 33 and the mass block 21 during vibration and to improve vibration damping of the vibrator assembly 2.

[0024] Furthermore, as shown in FIGS. 2 and 3, a position limiting block 7 for limiting movement of the transducer assembly 2 along the vibration direction X is fixed to the casing bottom cover 12. As shown in FIG.

[0025] Compared with the prior art, the welding sheet of the linear motor of the present invention is changed from a rectangular or chamfered structure to a circular arc structure, which can improve the stress distribution of the elastic support, reduce the wear of the elastic support, and extend the service life of the elastic support.

[0026] Although the embodiments of the present invention have been described in detail above, those skilled in the art can make modifications without departing from the spirit of the present invention, and all such modifications are within the scope of the present invention. [Explanation of symbols]

[0027] 100, linear motor; 1, casing; 11, upper cover; 12, lower cover; 13, accommodation space; 2, vibrator assembly; 21, mass block; 211, mounting cavity; 212, fixed protrusion; 22, magnetic circuit structure; 221, magnetic steel; 222, magnetic conductive plate; 3, elastic support; 31, first fixed part; 32, second fixed part; 33, connection part; 4, stator assembly; 41, coil; 42, iron core; 43, flexible circuit board; 5, welding sheet; 51, first side edge; 52, second side edge; 53, arc edge; 6, foam damping; 7, position limiting block; X, vibration direction.

Claims

1. A linear motor, The linear motor is a casing having an accommodation space; a vibrator assembly housed within the casing; a pair of elastic supports fixed to the casing and provided on both sides of the vibrator assembly in the vibration direction, The elastic support is a first fixing portion connected to the casing; a second fixed portion connected to the transducer assembly; a connecting portion that connects the first fixed portion and the second fixed portion, a welding sheet is provided on an outer surface of the second fixing portion; The welding sheet includes two first side edges that are parallel to each other and extend in the vibration direction, and a second side edge and an arc edge that connect the two first side edges, The linear motor, characterized in that the arcuate edge is closer to the connection portion than the second side edge, and the arcuate edge protrudes in a direction away from the second side edge.

2. The linear motor according to claim 1 , wherein the second side edge is perpendicular to the vibration direction.

3. The linear motor according to claim 2 , wherein the arcuate edge is symmetrical along the central axis of the second side edge.

4. The linear motor according to claim 1 , wherein the first side edge and the second side edge are flush with an edge of the second fixing portion.

5. The transducer assembly includes: a mass block having a mounting cavity; a magnetic circuit structure disposed within the mounting cavity; the mass block is provided with a fixing protrusion that is fixed to the second fixing portion, 2. The linear motor according to claim 1, wherein the shape of the fixing protrusion matches the shape of the welding sheet.

6. 6. The linear motor of claim 5, wherein foam damping is provided between the connection portion and the mass block.

7. The casing includes an upper cover and a lower cover that are provided opposite to each other, 2. The linear motor according to claim 1, wherein a stator assembly for driving the vibrator assembly to vibrate and a position limiting block for limiting movement of the vibrator assembly along the vibration direction are fixed to the lower cover.

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