Linear motor

Abstract

The utility model belongs to the technical field of linear motors, and discloses a linear motor, which comprises a shell, a first coil, a second coil and an oscillator module, the wall thickness of the shell is consistent, an accommodating cavity is enclosed, a first boss and a second boss are integrally formed on the inner wall of the accommodating cavity, and the first boss and the second boss are used as pole pieces. A first groove is formed in the position, corresponding to the first boss, of the outer wall of the shell, a second groove is formed in the position, corresponding to the second boss, of the outer wall of the shell, the first coil, the second coil and the vibrator module are all arranged in the containing cavity, the first coil is connected to the first boss, the second coil is connected to the second boss, and the vibrator module is located between the first coil and the second coil. According to the linear motor, the first boss and the second boss which are integrally formed in the shell can effectively increase a gathering magnetic field and improve the vibration performance of the linear motor, and on the basis, the first groove and the second groove are arranged, so that the wall thickness of the shell is consistent, and the magnetic field can be further gathered.

Description

Technical Field

[0001] The utility model relates to the technical field of linear motors, in particular to a linear motor. Background Art

[0002] Linear motors are usually arranged in existing electronic devices such as smart phones, smart watches and the like, as well as wearable devices such as VR / CR, so as to improve the user experience.

[0003] A linear motor generally includes a housing, pole pieces, a coil and an oscillator module. The pole pieces, the coil and the oscillator module are all arranged in the housing. The pole pieces are welded to the inner wall of the housing, the coil is installed on the pole pieces, and the magnetic field generated by the cooperation of the energized coil and the pole pieces drives the oscillator module to vibrate in the housing. In the prior art, the pole pieces and the housing are independent of each other and are connected by welding. The assembly process is complex, and corresponding welding work and quality inspection stations need to be configured on the production line, resulting in higher production costs. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a linear motor with a simple structure, which can effectively reduce the production cost.

[0005] To achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A linear motor, comprising:

[0007] A housing, the housing has a uniform wall thickness dimension and encloses to form a receiving cavity. A first boss and a second boss are integrally formed on the inner wall of the receiving cavity. The first boss and the second boss serve as pole pieces. A first groove is formed on the outer wall of the housing corresponding to the position of the first boss, and a second groove is formed corresponding to the position of the second boss;

[0008] A first coil, arranged in the receiving cavity and connected to the first boss;

[0009] A second coil, arranged in the receiving cavity and connected to the second boss;

[0010] An oscillator module, arranged in the receiving cavity and located between the first coil and the second coil.

[0011] Preferably, the first boss and the first groove are synchronously formed by a stamping process; and / or

[0012] The second boss and the second groove are synchronously formed by a stamping process.

[0013] Preferably, the housing includes:

[0014] A first housing, provided with a receiving groove, and the first boss is arranged at the bottom of the receiving groove;

[0015] A second housing, which is in a plate-like structure, covers the notch of the accommodating groove, and the accommodating cavity is formed by covering the accommodating groove through the second housing, and the second boss is arranged on the plate surface of one side of the second housing.

[0016] Preferably, the oscillator module includes:

[0017] A mass block, which is arranged in the accommodating cavity and located between the first coil and the second coil;

[0018] A magnet, which is connected to the mass block;

[0019] Two elastic members, which are located on opposite sides of the mass block, and the elastic members are clamped between the mass block and the inner wall of the accommodating cavity.

[0020] Preferably, it further includes a first sealing film and / or a second sealing film. The first sealing film is connected to the outer wall of the housing and covers the first groove, and the second sealing film is connected to the outer wall of the housing and covers the second groove.

[0021] Preferably, it further includes a circuit board, and the first coil and the second coil are respectively connected to the circuit board.

[0022] Preferably, the accommodating cavity communicates with the outside through a first communication hole, and the connecting end of the first coil extends out of the first communication hole and is connected to the circuit board.

[0023] Preferably, it further includes a sealing rubber block, and the sealing rubber block is connected to the outer wall of the housing and covers the first communication hole.

[0024] Preferably, the accommodating cavity communicates with the outside through a second communication hole. The circuit board includes an external board body and an internal board body which are connected to each other. The external board body is located outside the accommodating cavity, and the internal board body extends into the accommodating cavity through the second communication hole, and the connecting end of the second coil is connected to the internal board body.

[0025] Preferably, it further includes a connecting ear, and the connecting ear is connected to the housing.

[0026] The beneficial effects of the present utility model:

[0027] The first boss and the second boss serving as pole pieces are integrally formed inside the housing, which can effectively increase the converging magnetic field and improve the vibration performance of the linear motor. On this basis, by setting the first groove and the second groove, the wall thickness dimension of the housing is made consistent, which can further converge the magnetic field and ensure the consistency and stability of the magnetic field. Structurally, the first boss and the second boss are integrally formed on the housing, reducing two pole piece parts, simplifying the structure, reducing the size of the linear motor in the thickness direction, optimizing the assembly process of the linear motor, and canceling the settings of welding process, pole piece welding machine, dimension inspection machine, appearance manual inspection, etc., thereby improving the assembly efficiency and reducing the production cost. Brief Description of the Drawings

[0028] Figure 1 is a schematic structural view of the linear motor according to an embodiment of the present invention;

[0029] Figure 2 is an exploded view of the linear motor according to an embodiment of the present invention;

[0030] Figure 3 is a schematic structural view of the housing according to an embodiment of the present invention;

[0031] Figure 4 is a schematic structural view of the first housing in one orientation according to an embodiment of the present invention;

[0032] Figure 5 is a schematic structural view of the first housing in another orientation according to an embodiment of the present invention;

[0033] Figure 6 is a schematic structural view of the second housing in one orientation according to an embodiment of the present invention;

[0034] Figure 7 is a schematic structural view of the second housing in another orientation according to an embodiment of the present invention;

[0035] Figure 8 is a schematic structural view of the oscillator module according to an embodiment of the present invention;

[0036] Figure 9 is a schematic structural view of the circuit board according to an embodiment of the present invention.

[0037] In the figure:

[0038] 1. Housing;

[0039] 11. First housing; 111. First boss; 112. First groove;

[0040] 12. Second housing; 121. Second boss; 122. Second groove;

[0041] 13. First communication hole;

[0042] 14. Second communication hole;

[0043] 2. First coil;

[0044] 3. Second coil;

[0045] 4. Oscillator module;

[0046] 41. Mass block; 42. Magnet; 43. Elastic member;

[0047] 5. First sealing film;

[0048] 6. Second sealing film;

[0049] 7. Circuit board;

[0050] 71. External board body; 72. Internal board body;

[0051] 8. Sealing rubber block;

[0052] 9. Connecting ear. Detailed implementation manner

[0053] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar components or components with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation to the present invention.

[0054] In the description of the present invention, unless otherwise clearly specified and defined, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, a mechanical connection, an electrical connection, a direct connection, or an indirect connection through an intermediate medium. It may be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] In the description of the present utility model, unless otherwise clearly specified and defined, the first feature being "above" or "below" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact through additional features therebetween. Moreover, the first feature being "above", "over", and "on top of" the second feature includes the first feature being directly above and obliquely above the second feature, or merely indicating that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "beneath", and "underneath" the second feature includes the first feature being directly below and obliquely below the second feature, or merely indicating that the horizontal height of the first feature is less than that of the second feature.

[0056] The technical solution of the present utility model will be further described below in conjunction with the accompanying drawings and through specific embodiments.

[0057] As Figures 1-9 shown, the present utility model provides a linear motor, including a housing 1, a first coil 2, a second coil 3, and a vibrator module 4. Among them, the housing 1 has a uniform wall thickness dimension and encloses to form a receiving cavity. First bosses 111 and second bosses 121 are integrally formed on the inner wall of the receiving cavity. The first bosses 111 and the second bosses 121 serve as pole pieces. A first groove 112 is formed at the position of the outer wall of the housing 1 corresponding to the first boss 111, and a second groove 122 is formed at the position corresponding to the second boss 121. The first coil 2, the second coil 3, and the vibrator module 4 are all arranged in the receiving cavity. The first coil 2 is connected to the first boss 111, the second coil 3 is connected to the second boss 121, and the vibrator module 4 is located between the first coil 2 and the second coil 3.

[0058] In the present utility model, the first bosses 111 and the second bosses 121 serving as pole pieces are integrally formed inside the housing 1, which can effectively increase the converging magnetic field and improve the vibration performance of the linear motor. On this basis, by providing the first groove 112 and the second groove 122, the wall thickness dimension of the housing 1 is made uniform, which can further converge the magnetic field and ensure the consistency and stability of the magnetic field. Structurally, the first bosses 111 and the second bosses 121 are integrally formed on the housing 1, reducing two pole piece parts, simplifying the structure, reducing the size of the linear motor in the thickness direction, optimizing the assembly process of the linear motor, canceling the settings of welding processes, pole piece welding machines, dimensional inspection machines, and appearance manual inspections, thereby improving the assembly efficiency and reducing the production cost.

[0059] Specifically, the first boss 111 and the first groove 112 are synchronously formed by a stamping process; and / or the second boss 121 and the second groove 122 are synchronously formed by a stamping process. The above settings ensure the dimensional accuracy of the processing, further improve the processing and preparation efficiency, and reduce the production cost.

[0060] In this embodiment, the first boss 111 and the first groove 112 are formed synchronously by stamping, and the second boss 121 and the second groove 122 are formed synchronously by stamping.

[0061] In other embodiments, the structures of the cooperation between the first boss 111 and the first groove 112, and the structures of the cooperation between the second boss 121 and the second groove 122 can also be integrally formed by processes such as casting or stamping according to actual requirements.

[0062] Specifically, the thickness dimension range of the first boss 111 is 0.100 - 0.130 mm, and the length and width dimensions are set according to actual requirements. The thickness dimension range of the second boss 121 is 0.100 - 0.130 mm, and the length and width dimensions are set according to actual requirements.

[0063] More specifically, the thickness dimension of the first boss 111 is 0.115 mm, the length dimension is 8.2 mm, and the width dimension is 4.5 mm. The thickness dimension of the second boss 121 is 0.115 mm, the length dimension is 7.7 mm, and the width dimension is 4.5 mm.

[0064] In this embodiment, the overall thickness dimension after installing the first coil 2 on the first boss 111 is 0.625 mm, and the overall thickness dimension after installing the second coil 3 on the second boss 121 is 0.625 mm.

[0065] Specifically, the housing 1 includes a first housing body 11 and a second housing body 12. Among them, the first housing body 11 is provided with a receiving groove, the first boss 111 is arranged at the bottom of the receiving groove, and a first groove 112 is formed on the outer wall of the first housing body 11 corresponding to the position of the first boss 111. The second housing body 12 is in a plate-like structure and covers the opening of the receiving groove. The receiving groove forms a receiving cavity through the covering of the second housing body 12. The second boss 121 is arranged on one side plate surface of the second housing body 12, and a second groove 122 is formed on the other side plate surface of the second housing body 12 corresponding to the position of the second boss 121. In the above settings, the housing 1 is assembled from the first housing body 11 and the second housing body 12, with a simple structure and convenient processing.

[0066] More specifically, the oscillator module 4 includes a mass block 41, a magnet 42, and two elastic members 43. Among them, the mass block 41 is arranged in the receiving cavity, between the first coil 2 and the second coil 3. The magnet 42 is connected to the mass block 41. The two elastic members 43 are located on opposite sides of the mass block 41, and the elastic members 43 are clamped between the mass block 41 and the inner wall of the receiving cavity. The above settings ensure that the oscillator module 4 can vibrate reliably in the receiving cavity.

[0067] In this embodiment, the first housing 11 and the second housing 12 are made of metal stainless steel, and 444 or 430 material or similar types of materials are preferably selected. Based on the deep-drawing parts, the position and shape of the original pole piece are directly formed by stamping and half-cutting process, which plays a role in increasing the converging magnetic field and enhancing the vibration performance of the linear motor. The mass block 41, the magnet 42, and the two elastic members 43 are all located in the accommodating groove of the first housing 11. A through hole is provided in the middle of the mass block 41, and the magnet 42 is installed in the through hole. The two elastic members 43 are respectively connected to the opposite side walls of the accommodating groove. When the linear motor is powered on and working, under the action of the magnetic field, the moving directions of the mass block 41 and the magnet 42 are perpendicular to the depth direction of the accommodating groove. The mass block 41, the magnet 42, and the two elastic members 43 are assembled by welding, which can generate a driving magnetic field and provide a vibration sensation, and is the core component of the linear motor vibration. The material of the mass block 41 is tungsten-nickel-iron alloy, the material of the magnet 42 is neodymium iron boron, and the elastic member 43 is a bent elastic piece, and the material is SUS301 stainless steel material.

[0068] In other embodiments, the mass block 41 can also be a block structure, the magnet 42 is clamped between multiple mass blocks 41, and the elastic member 43 can also be a spring.

[0069] Specifically, the linear motor further includes a first sealing film 5 and / or a second sealing film 6. The first sealing film 5 is connected to the outer wall of the housing 1 to cover the first groove 112, and the second sealing film 6 is connected to the outer wall of the housing 1 to cover the second groove 122. The above settings can improve the dustproof and waterproof performance of the housing 1, and after covering the first groove 112 and the second groove 122, the appearance of the housing 1 is ensured to be smooth.

[0070] In this embodiment, the linear motor includes a first sealing film 5 and a second sealing film 6. The first sealing film 5 is attached to the first housing 11, and the second sealing film 6 is attached to the second housing 12. The first sealing film 5 and the second sealing film 6 are specifically made of polymer materials, and waterproof PET and PSA materials are preferably selected, which have the characteristics of high strength, good adhesion, good sealing performance, long service life, etc., and have their own adhesiveness, and can be directly pasted on the surfaces of the first housing 11 and the second housing 12 to cover the first groove 112 and the second groove 122, playing a role of sealing and waterproofing, and making the product look more beautiful.

[0071] Specifically, the linear motor further includes a circuit board 7, and the first coil 2 and the second coil 3 are respectively connected to the circuit board 7. By providing the circuit board 7, the power supply and control of the first coil 2 and the second coil 3 can be realized.

[0072] More specifically, the accommodating cavity communicates with the outside through the first communication hole 13, and the connection end of the first coil 2 extends out of the first communication hole 13 and is connected to the circuit board 7. By providing the first communication hole 13, it is convenient to connect the circuit board 7 and the first coil 2.

[0073] In this embodiment, the linear motor further includes a sealant block 8. The sealant block 8 is connected to the outer wall of the housing 1 to seal the first communication hole 13. By providing the sealant block 8, external foreign matters are prevented from invading the accommodation cavity.

[0074] More specifically, the accommodation cavity communicates with the outside through a second communication hole 14. The circuit board 7 includes an external board body 71 and an internal board body 72 that are connected to each other. The external board body 71 is located outside the accommodation cavity. The connection end of the first coil 2 extends out of the first communication hole 13 and is connected to the external board body 71. The internal board body 72 extends into the accommodation cavity through the second communication hole 14. The connection end of the second coil 3 is connected to the internal board body 72. By providing the second communication hole 14, it is convenient to connect the circuit board 7 and the second coil 3.

[0075] In this embodiment, the first coil 2 and the second coil 3 are copper coils. The material is pure copper and a self-adhesive layer and an insulating layer are added on the surface. The copper content is not less than 99.95% to reduce the energy loss caused by the internal resistance. The number of turns of the coil is 120 turns, and the coil can be adjusted and customized according to actual requirements. The circuit board 7 is specifically a flexible circuit board, which is mainly connected to the first coil 2 and the second coil 3 to realize the circuit connection and conduction of the system. The material is mainly plastic, glue, copper, etc. The sealant block 8 is made of a liquid glue material, and UV glue or epoxy glue can be selected. After curing, it plays a role of sealing and protection. The first communication hole 13 is provided at the connection of the bottom of the accommodation groove of the first housing 11 and a groove wall. An avoidance notch is provided at the notch of the accommodation groove. The avoidance notch forms a second communication hole 14 through the cover of the second housing 12. The sealant block 8 covers the connection between the circuit board 7 and the first coil 2, and the internal board body 72 seals the second communication hole 14.

[0076] Specifically, the linear motor further includes a connecting ear 9. The connecting ear 9 is connected to the housing 1. By providing the connecting ear 9, it is convenient to assemble the linear motor into electronic devices such as smart phones and smart watches.

[0077] In this embodiment, there are three connecting ears 9. Two connecting ears 9 and the external board body 71 are located on the same side of the first housing 11, and the external board body 71 is located between the two connecting ears 9. One connecting ear 9 and the external board body 71 are located on opposite sides of the first housing 11. The connecting ear 9 is provided with fastening holes to facilitate the assembly of fasteners. The connecting ear 9 is made of metal stainless steel, preferably SUS301-1 / 2H material or similar types of materials, with high required hardness and strong supporting ability. During assembly, it is fixed to the inside of the smart phone or smart watch with screws, playing a role of connection and fixation.

[0078] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limitations on the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all implementation manners here. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the claims of the present utility model.

Claims

1. A linear motor, characterized in that: include: A shell (1), wherein the shell (1) has a uniform wall thickness and is surrounded to form a receiving cavity, wherein the inner wall of the receiving cavity is integrally formed with a first boss (111) and a second boss (121), wherein the first boss (111) and the second boss (121) serve as pole pieces, and an outer wall of the shell (1) forms a first groove (112) at a position corresponding to the first boss (111), and forms a second groove (122) at a position corresponding to the second boss (121); A first coil (2) is disposed in the accommodating cavity and connected to the first boss (111); A second coil (3) is disposed in the accommodating cavity and connected to the second boss (121); The vibrator module (4) is arranged in the accommodating cavity and is located between the first coil (2) and the second coil (3).

2. The linear motor according to claim 1, characterized in that: The first boss (111) and the first groove (112) are simultaneously formed by a stamping process; and / or The second boss (121) and the second groove (122) are formed simultaneously by a stamping process.

3. The linear motor according to claim 1, characterized in that: The housing (1) comprises: The first housing (11) is provided with a receiving groove, and the first boss (111) is arranged at the bottom of the receiving groove; The second shell (12) is a plate-shaped structure, covering the notch of the accommodating groove, the accommodating groove forms the accommodating cavity through the cover of the second shell (12), and the second boss (121) is arranged on the plate surface of one side of the second shell (12).

4. The linear motor according to claim 1, characterized in that: The vibrator module (4) comprises: A mass block (41) is arranged in the accommodating cavity and located between the first coil (2) and the second coil (3); A magnet (42) connected to the mass block (41); Two elastic members (43) are located on two opposite sides of the mass block (41), and the elastic members (43) are sandwiched between the mass block (41) and the inner wall of the accommodating cavity.

5. The linear motor according to claim 1, characterized in that: It also comprises a first sealing film (5) and / or a second sealing film (6), wherein the first sealing film (5) is connected to the outer wall of the housing (1) to cover the first groove (112), and the second sealing film (6) is connected to the outer wall of the housing (1) to cover the second groove (122).

6. The linear motor according to claim 1, characterized in that: It also comprises a circuit board (7), and the first coil (2) and the second coil (3) are respectively connected to the circuit board (7).

7. The linear motor according to claim 6, characterized in that: The accommodating cavity is connected to the outside via a first connecting hole (13), and a connecting end of the first coil (2) extends out of the first connecting hole (13) and is connected to the circuit board (7).

8. The linear motor according to claim 7, characterized in that: It also comprises a sealing rubber block (8), wherein the sealing rubber block (8) is connected to the outer wall of the housing (1) and covers the first connecting hole (13).

9. The linear motor according to claim 6, characterized in that: The accommodating cavity is connected to the outside through a second connecting hole (14); the circuit board (7) comprises an external plate body (71) and an internal plate body (72) which are connected to each other; the external plate body (71) is located outside the accommodating cavity; the internal plate body (72) extends into the accommodating cavity through the second connecting hole (14); and the connection end of the second coil (3) is connected to the internal plate body (72).

10. The linear motor according to any one of claims 1 to 9, characterized in that: It also comprises a connecting ear (9), wherein the connecting ear (9) is connected to the housing (1).

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