WO2019184110A1

WO2019184110A1 - Voice coil motor

Info

Publication number: WO2019184110A1
Application number: PCT/CN2018/092764
Authority: WO
Inventors: 赖俊男
Original assignee: 苏州聚力电机有限公司
Priority date: 2018-03-27
Filing date: 2018-06-26
Publication date: 2019-10-03
Also published as: CN108377087A

Abstract

A voice coil motor, comprising a carrier, an upper spring plate, a lower spring plate, an iron yoke, and a lower cover. A base of the carrier is provided with a first through hole. An upper end surface is provided with a first adhesive dispensing recess. A lower end surface is provided with a first positioning post, a second adhesive dispensing recess, and a pre-loading protruding block. The upper end surface is further provided with a travel distance control protruding block. An outer side wall of the base is provided with a recess, a stopper block, and a rotation-preventing barrier block. A first end of a plate main body of the lower spring plate is provided with a soldering pad comprising a molten solder gap and gold fingers. The molten solder gap comprises an interconnected first and second gap. The iron yoke consists of a rectangular top plate and a side plate, is provided with a second through hole, and is connectedly provided with multiple folded-back parts formed by the rectangular top plate extending and bending downwards in an integrated manner. The lower cover is mounted at a lower opening of the iron yoke, a third through hole is provided at a middle portion of a flat cover body, and an upper surface is provided with a second positioning post, a heat stake, and an anti-dust ring. A lower surface of the flat cover body is provided with three base protrusions. A periphery of the upper surface is provided with a ring-like positioning recess. A bottom portion of the side plate of the iron yoke is inserted into the ring-like positioning recess for positioning, and an adhesive is applied.

Description

Voice coil motor

Technical field

The invention relates to a voice coil motor of a miniature camera, which can be assembled into a thin electronic product such as a mobile phone, a tablet computer or a smart watch.

Background technique

In the existing camera voice coil motor (VCM) design, the carrier is one of the most critical components. The carrier is provided with upper and lower through holes for assembling the lens of the camera; the outer circumference of the carrier is provided with a coil, and the yoke of the motor is provided with a magnet corresponding to the coil, so that when the coil is energized, the carrier can be electromagnetically induced. The upper and lower direction displacement is generated to achieve zooming and focusing of the camera; the upper or lower end faces of the carrier are also positioned with elastic pieces for generating elasticity, and the carrier can be restored to the initial horizontal position when the coil is not energized.

As shown in FIG. 1 and FIG. 2, the carrier of the current design includes a cylindrical base body 1. The outer circumference corresponding coil of the base body 1 is provided with a winding dispensing portion 2 and a winding bearing surface 3; wherein the bottom of the base body is surrounded by There are a plurality of plastic faces 4 . The carrier of the prior design uses the bottom plastic surface 4 of the carrier to contact the magnet in controlling the travel of the voice coil motor, so that the parallelism and appearance of each plastic surface 4 are required to be high, and the arc surface 5 needs to be processed, thereby increasing The difficulty of mold processing, and the high precision of dispensing in the production process; in addition, based on the structural design of the existing carrier, when the voice coil motor is impacted by external force, the plastic surface 5 of the carrier is easily affected by external force. The deformation occurs to reduce the reliability of the voice coil motor. In addition, the current carrier mostly adopts the central symmetrical design, so that it is convenient and quick to distinguish the direction during production and assembly, but it also has the following disadvantages: First, the supplier is easy to make a wrong direction when winding the wire, resulting in poor raw materials; When the carrier is placed in the production process, it is necessary to manually distinguish the direction. Due to the difference in the proficiency of the operator, the negligence of the work, and the lack of a foolproof mechanism, it is easy to cause the carrier to be misaligned, resulting in a large number of production lines. Bad products, increase production costs.

On the other hand, the coil windings on the carrier are mostly straight-wound, and the welding of the shrapnel is very high. The design of the shrapnel pad is required to match the carrier winding pattern. The shortcoming of the prior art is that the design of the shrapnel pad is unreasonable, and the shrapnel may be de-soldered after soldering, and there are undesirable phenomena such as small tin beads remaining, resulting in unstable welding.

At the same time, with the booming market of smart phones and other markets, the demand for voice coil motors is increasing, and the requirements for the characteristics of voice coil motors are getting higher and higher, and the existing voice coil motors are designed to meet the light and thin products. The trend is that it is difficult to make the structure large. Therefore, improving the motor characteristics and increasing the magnetic field force of the motor without increasing the size of the product has been a problem that the industry is seeking to break through.

Also, in the design of the existing voice coil motor, the lower surface of the motor bottom cover is provided with a groove, and the purpose of the groove is reserved to meet the requirements of the customer for subsequent assembly of the camera product. With the design of the groove, the customer's enterprise can ensure the assembly precision of the two parts when assembling the voice coil motor and the bracket. Therefore, the parallelism and flatness of the groove are required to be high, which increases the difficulty of mold processing. .

Further, in the design of the existing voice coil motor, as shown in FIG. 3, the yoke 20 and the lower cover 21 are in the form of up-and-down assembly, and in order to connect and position with the yoke 20, four sides are respectively provided around the lower cover 21. The card slot 22 is plugged and combined with the four card blocks 23 at the bottom of the yoke 20. The problem with the prior art is that the combined portion of the yoke 20 and the lower cover 21 is fixed by means of an external four-side seal, and the plastic area reserved on the lower cover 21 is small, which affects the subsequent mode of the customer's enterprise. The size of the tapping position during assembly is easy to cause degumming, and it is easy to cause the bottom of the casing to overflow, which makes the dispensing uneven and adversely affects the appearance of the voice coil motor product.

Therefore, how to solve the above-mentioned deficiencies of the prior art has become a problem to be solved by the present invention.

Summary of the invention

It is an object of the invention to provide a voice coil motor.

In order to achieve the above object, the technical solution adopted by the present invention is:

A voice coil motor comprising a carrier, an upper elastic piece, a lower elastic piece, a yoke iron and a lower cover;

The carrier includes a body, and a first through hole is formed in the upper and lower sides of the base body for assembling the lens of the camera; the upper end surface of the base body is provided with a plurality of first dispensing grooves, and each of the first dispensing points a slot is recessed on the upper end surface, and an upper elastic piece of the voice coil motor is positioned by adhesive connection; a plurality of first positioning posts and a plurality of second dispensing grooves are disposed on the lower end surface of the base body; Positioning post protruding from the lower end surface against the lower cover of the positioning voice coil motor; each second dispensing groove is recessed on the lower end surface, and the lower elastic piece of the voice coil motor is positioned by adhesive connection; wherein At least three stroke control protrusions are further disposed on the upper end surface of the base body, and each of the stroke control protrusions is evenly distributed along the circumferential direction of the first through hole to form a supporting surface, and the surface of each stroke control protrusion The parallelism is uniform; the travel of the carrier in the up and down direction is defined by the housing of the positioning voice coil motor; wherein the outer side wall of the seat body is provided with a groove in the up and down direction, and the outer side wall is further provided with At least one limit block; in addition, the outer side wall Also a plurality of outwardly projecting anti-rotation stoppers provided, each anti-rotation stopper positioned opposite the yoke of a voice coil motor; a lower end of said seat body is provided with a convex surface bump preload acting on the lower elastic piece;

The lower elastic piece includes a sheet-shaped main body having a first end connected to the carrier, and a second end connected to the lower cover; the first end and the first end The second ends are connected by a bent string of the elastic piece; the first end of the sheet-shaped body is provided with a flat soldering pad, the soldering pad is attached to the end surface of the carrier, and is wound with the carrier The coil is soldered and positioned; wherein the soldering pad comprises a soldering tin notch and at least one soldering gold finger, the soldering tin notch comprises a first notch and a second notch; the first notch is rectangular, each of the soldering The gold fingers are disposed in parallel in the first notch; the second notch is semi-circular, and one side thereof is disposed in communication with the first notch through a connecting opening;

The yoke includes a cover body, the cover body is composed of a rectangular top plate and four side plates; a second through hole is defined in a middle portion of the rectangular top plate, and the second through hole is the same as the first through hole The shaft plate is formed by the rectangular top plate integrally extending downward along the four sides thereof, and forming an assembly chamber between the rectangular top plate and the four side plates to define a lower opening for assembly positioning. The carrier; wherein the middle portion of the rectangular top plate is further provided with a plurality of folding portions, and each of the folding portions is formed by the rectangular top plate integrally extending downwardly corresponding to the second through hole, and Each of the folded portions is evenly distributed around a center of the second through hole;

The lower cover is mounted on the lower opening of the yoke, and includes a rectangular flat cover. The middle of the flat cover defines a third through hole, and the third through hole and the second through hole a coaxial arrangement; wherein the upper surface of the flat cover body is provided with four second positioning posts, a plurality of heat-melting columns and a dustproof ring; each of the second positioning posts respectively corresponding to the upper surface of the flat cover body Four corners for connecting and positioning the yoke; each of the heat-melting columns is upwardly convex for welding to position the lower elastic piece; the dustproof ring is disposed around the third through hole, The third through hole is the same as the center of the circle; the lower surface of the flat cover body is provided with three bottom bosses, and each bottom boss is disposed around the third through hole, and is arranged at an angle of 120 degrees to form a connection of the three. a triangle

The upper surface of the lower cover is recessed to form a rectangular annular positioning groove, and the yoke is inserted into the annular positioning groove with the bottoms of the four side plates, and the inner side of each of the side plates is fitted The groove wall of the annular positioning groove is assembled with the yoke and the lower cover; the joint portion of each of the side plates and the annular positioning groove is connected by an adhesive to achieve the yoke and The positioning of the lower cover.

The relevant content in the above technical solutions is explained as follows:

1. In the above solution, at least three stroke control bumps are uniformly distributed in the circumferential direction to form a stable supporting surface. Since the area supporting the surface is large and there is no need to machine the circular surface, it is easier to control in the processing and production of the mold than in the prior art, and it is not easy to produce a poor appearance; in addition, it is not necessary here in the production process of the voice coil motor. Dispensing, there is no problem with poor glue.

2. In the above solution, by the arrangement of the grooves, the size of one side of the carrier is different from the other three sides in order to achieve the purpose of visual foolproof, and at the same time, it can also be used for visual inspection equipment for automatic production, overcoming many manual placement of carriers. insufficient.

3. In the above solution, the setting of the limiting block is used to function as a fixture limit, which is convenient for improving the efficiency and accuracy of the carrier placement.

4. In the above solution, each of the anti-rotation blocks is disposed around the seat body in the circumferential direction; thereby, the structural strength of the carrier can be further strengthened, and the voice coil motor is subjected to an external force impact. It is good to protect the carrier so that it is not easily damaged.

5. In the above solution, by the design of the pre-pressing bump, when the lower elastic piece is positioned between the lower end surface of the base body and the lower cover, the lower elastic piece will be jacked up by the pre-pressing protrusion A pre-deformation is generated; the pre-deformation will help the carrier to have a slight displacement when the coil is suddenly energized, without causing damage to the carrier.

6. In the above solution, each of the first dispensing grooves is evenly distributed on the upper end surface along a circumferential direction of the first through hole.

7. In the above solution, each of the first positioning post and each of the second dispensing grooves are disposed around the lower end surface in a circumferential direction.

8. In the above solution, a winding post is protruded outwardly on the outer side wall of the base body, and the winding post is used for positioning the wire end of the voice coil motor coil.

9. In the above solution, the first notch of the molten tin notch and the design of the welded gold finger can increase the welding area, help the welding of the gold finger and the coil to be better welded, and improve the stability of the welding. Can avoid the occurrence of desoldering.

10. In the above solution, by the design of the molten tin notch, especially the semi-circular design of the second notch, the residual of the small tin beads can be avoided and the welding quality can be improved.

11. In the above aspect, the sheet-like body is segmented and includes two segments of the same shape; the two segments are symmetrically disposed along a center point of the first through hole, and each of the segments The first end and the second end are both included in the fragment body.

12. The above solution, the first end of the sheet-shaped body and the second end of the sheet-like body are respectively provided with a plurality of positioning holes, which are inserted and combined with the first positioning post of the carrier.

13. In the above solution, the second end of the sheet-like body is provided with a base soldering pad for soldering and positioning the lower cover.

14. In the above solution, by adding a plurality of folds (inner yoke) to the yoke, the magnetic field force can be effectively increased, and the characteristics of the voice coil motor can be improved.

15. In the above solution, the folding portion has four, disposed at 90 degrees to each other, and corresponds to the four corners of the cover-shaped body.

16. In the above solution, the four corners of the rectangular top plate are all recessed downward, and the four corners constituting the rectangular top plate are formed with a falling surface. By this design, the upper elastic piece of the voice coil motor can be supported, and the bracket for the support of the upper elastic piece in the existing voice coil motor can be omitted, which can reduce the material cost, reduce the process, and improve the product. Overall assembly accuracy, which in turn increases the yield.

In the above solution, the rectangular top plate is further provided with a plurality of retaining grooves around the second through hole, and each of the retaining grooves is disposed corresponding to two sides of the folding portion; Dispensing operation when the upper elastic piece of the voice coil motor is connected to the carrier.

18. In the above solution, the dust ring is disposed around the third through hole to function as a carrier for sealing the voice coil motor.

19. In the above solution, by the arrangement of the three bottom bosses, on the one hand, only the surface parallelism and flatness of the three bottom bosses need to be ensured, and the case is substantially larger than the grooves of the entire lower surface. The area required for surface parallelism and flatness is reduced, the requirements on the mold are reduced, and the production cost is reduced; on the other hand, the convex design of the bottom boss and the arrangement of the "triangle" are also It can facilitate the customer's enterprise to connect the voice coil motor with other components of the camera (such as the bracket), and improve the stability after positioning.

In the above solution, the upper surface of the flat cover body is further provided with an anti-rotation bump, and the anti-rotation bump is disposed corresponding to an anti-rotation block on the voice coil motor carrier, and the two are used for positioning Carrier.

In the above solution, the upper surface of the flat cover body is further provided with a pre-pressing protrusion, and the pre-pressing protrusion is arranged in cooperation with the pre-pressing protrusion on the voice coil motor carrier, and the two cooperate to act on the lower side. The shrapnel causes it to produce a pre-deformation. By pre-deformation, it will help the carrier to have a slight displacement when the coil is suddenly energized, without causing damage to the carrier.

22. In the above solution, the lower surface of the flat cover is further provided with a plurality of PIN pins for electrically coupling other components of the camera.

In the above solution, the lower surface of the flat cover body is provided with a bottom surface groove around the third through hole, and each of the bottom protrusions is disposed in the bottom surface groove.

In the above aspect, the bonding portion includes a contact portion between a bottom of each of the side plates and a groove bottom of the annular positioning groove, and further includes an inner side of each of the side plates and a groove of the annular positioning groove The contact of the wall.

25. In the above aspect, the annular positioning groove is located at an outermost edge of the upper surface of the lower cover, and the annular positioning groove comprises only a groove wall facing the inner side.

The working principle and advantages of the present invention are as follows:

Compared to the prior art, the present invention:

1. The bumps are uniformly distributed in the circumferential direction by at least three strokes on the carrier to form a stable supporting surface. Since the area supporting the surface is large and there is no need to machine the circular surface, it is easier to control in the processing and production of the mold than in the prior art, and it is not easy to produce a poor appearance; in addition, it is not necessary here in the production process of the voice coil motor. Dispensing, there is no problem with poor glue. When the voice coil motor is impacted by an external force, the carrier of the present invention has a large impact area, so that the deformation after the impact is small, and the reliability of the voice coil motor can be effectively improved, so that the customer can use it more confidently. Through the design of the foolproof mechanism, on the one hand, the supplier is prevented from making the wrong direction when winding the wire, which causes the raw materials to be bad. On the other hand, in the production process, the operator needs to distinguish the direction when placing the carrier, which is time-consuming and laborious and not Reliable, it can avoid product defects caused by the wrong direction of the carrier and improve the production yield.

Second, the welding pad of the lower shrapnel is optimized, and the welding gold finger and the molten tin notch are added; the welding area is increased by welding the gold finger, which helps the welding of the gold finger and the coil to be better welded, thereby improving the stability of the welding. It can avoid the occurrence of desoldering. On the other hand, the design of the tin-filled notch can avoid the residual of small tin beads; therefore, it can effectively improve production efficiency and production stability, improve the yield rate, and save manual labor and cost without manual inspection and heavy work. .

3. Without increasing the size of the yoke, by adding a plurality of folding portions at the second through hole, the magnetic field force of the voice coil motor can be effectively increased, and the characteristics of the voice coil motor can be improved.

Fourth, by increasing the design of the bottom boss on the lower surface of the lower cover, it does not affect the accuracy of the customer assembly, but also effectively improves the assembly yield of the customer, and can reduce the cost of the mold processing.

5. The sealing method of the yoke and the lower cover is changed to the internal sealing, so it has the following advantages: 1. It can effectively increase the adhesive area of the module assembly, increase the push-pull force of the module, and increase the production yield of the customer. To meet the demand of customers' push-pull force; 2. It can simplify the production process of the voice coil motor, directly dispense the glue before the yoke and the lower cover are assembled, and do not need to perform the second turn over due to the finished sealant; 3. In the production process, it will not The appearance of the bottom of the voice coil motor is poor.

DRAWINGS

Figure 1 is a plan view of a prior art carrier;

Figure 2 is a perspective view of a prior art carrier;

Figure 3 is a perspective view of the prior art (bottom viewing angle);

4 is a top plan view of a carrier according to an embodiment of the present invention;

Figure 5 is a perspective view of a top view of a carrier according to an embodiment of the present invention;

Figure 6 is a bottom plan view of a carrier according to an embodiment of the present invention;

Figure 7 is a perspective view of a bottom view of a carrier according to an embodiment of the present invention;

8 is a schematic structural view of a shrapnel according to an embodiment of the present invention;

Figure 9 is an enlarged view of a portion H in Figure 8.

Figure 10 is a top plan view of a yoke according to an embodiment of the present invention;

Figure 11 is a perspective view of a yoke according to an embodiment of the present invention.

Figure 12 is a perspective view of the upper view of the lower cover according to an embodiment of the present invention;

Figure 13 is a schematic view showing the structure of the lower surface of the lower cover according to the embodiment of the present invention.

Figure 14 is a perspective view of an embodiment of the present invention;

In the above drawings: 1. seat body; 2. winding glue part; 3. winding bearing surface; 4. plastic surface; 5. arc surface; 6. winding column; A. carrier; B. ; C. yoke; D. lower cover; 7. seat; 8. first through hole; 9. upper end; 10. first glue groove; 11. lower end; 12. first positioning column; Second point glue groove; 14. stroke control bump; 15. outer side wall; 16. anti-rotation block; 17. pre-pressing bump; 18. groove; 19. limit block; 20. yoke; Lower cover; 22. card slot; 23. card block; 31. sheet-like body; 32. first end; 33. second end; 34. shrapnel string; 35. solder pad; 36. soldering gold finger; Melting tin notch; 38. first notch; 39. second notch; 40. slice body; 41. positioning hole; 42. base solder pad; 43. connection opening; 51. cover body; 52. rectangular top plate ; 53. side plate; 54. second through hole; 55. assembly chamber; 56. folding portion; 57. sinking surface; 58. position groove; 61. flat cover; 62. 63. upper surface; 64. second positioning post; 65. hot melt column; 66. dust ring; 67. lower surface; 68. bottom groove; 69. bottom boss; 70. anti-rotation bump; Pre-pressed bump; 72. PIN foot; 73. ring Positioning groove.

detailed description

The present invention is further described below in conjunction with the accompanying drawings and embodiments:

Embodiments: Referring to Figures 4 to 14, a voice coil motor includes a carrier A, an upper elastic piece, a lower elastic piece B, a yoke C and a lower cover D;

As shown in FIGS. 4-7, the carrier A includes a body 7 in which a first through hole 8 is formed in the upper and lower directions for assembling a lens of the camera; There is a plurality of first dispensing tanks 10, each of the first dispensing tanks 10 is recessed on the upper end surface 9, and the upper elastic piece is positioned by an adhesive connection (not shown); each of the first dispensing glues The groove 10 is evenly distributed on the upper end surface 9 in the circumferential direction of the first through hole 8. A plurality of first positioning posts 12 and a plurality of second dispensing slots 13 are disposed on the lower end surface 11 of the base 7. The first positioning posts 12 are protruded from the lower end surface 11 and are positioned against the lower end. a cover D; each of the second dispensing grooves 13 is recessed in the lower end surface 11, and the lower elastic piece B is positioned by an adhesive connection; each of the first positioning posts 12 and each of the second dispensing grooves 13 are along A circumferential direction is provided around the lower end surface 11.

The upper end surface 9 of the base body 7 is further provided with four stroke control protrusions 14 , and each of the stroke control protrusions 14 is uniformly distributed along the circumferential direction of the first through hole 8 to form a supporting surface. And the surface parallelism of each stroke control bump 14 is uniform; the positioning of the carrier A in the up and down direction is defined by positioning the yoke C against the ground.

Among them, the four stroke control bumps 14 constitute a stable supporting surface. Since the area supporting the surface is large and there is no need to machine the circular surface, it is easier to control in the processing and production of the mold than in the prior art, and it is not easy to produce a poor appearance; in addition, it is not necessary here in the production process of the voice coil motor. Dispensing, there is no problem with poor glue.

Wherein, the outer side wall 15 of the base body 1 is provided with a groove 18 in the up and down direction, and the side of the carrier A is different in size from the other three sides for visual blindness prevention, and can also be used for visual inspection of automated production. The device overcomes many disadvantages of manually placing the carrier; and the outer side wall 15 is further provided with at least one limiting block 19 to serve as a fixture limit, which is convenient for improving the efficiency and accuracy of the carrier A when placed.

A plurality of anti-rotation stops 16 are protruded outwardly from the outer side wall 15 of the base body 7. The anti-rotation stops 16 are positioned relative to the yoke C, and each of the anti-rotation blocks 16 is circumferentially It is disposed around the seat body 7. By this design, the structural strength of the carrier A can be further enhanced, and the carrier A can be better protected when the voice coil motor is subjected to an external force, so that it is not easily damaged.

A pre-pressing protrusion 17 is protruded from the lower end surface 11 of the base body 7 to act on the lower elastic piece B. When the lower elastic piece B is positioned between the lower end surface 11 of the base body 7 and the lower cover D, the lower elastic piece B will be pre-deformed by the lifting of the pre-pressing protrusion 17; When the coil is suddenly energized, the carrier A can have a slight displacement amount without causing damage to the carrier A.

A bobbin 6 is protruded outwardly from the outer side wall 15 of the base body 7, and the bobbin 6 is used to position the wire end of the coil.

As shown in FIGS. 8 and 9, the lower elastic piece B includes a sheet-like main body 31 provided with a first end 32 connected to the carrier A, and is further provided with the lower cover D. The second end 33 of the connection; the first end 32 and the second end 33 are connected by a shrapnel string 34 which is bent. The first end 32 of the sheet-like body 31 is provided with a flat soldering pad 35 through which the end face of the carrier A is attached and soldered to the coil wound on the carrier A.

The solder pad 35 includes a soldering notch 37 and at least one soldering gold finger 36. The soldering notch 37 includes a first notch 38 and a second notch 39. The first notch 38 has a rectangular shape. The welding gold fingers 36 are disposed in parallel in the first notch 38; the second notch 39 has a semicircular shape, and one side thereof is disposed in communication with the first notch 38 through a connecting opening 43.

By this design, the design of the first notch 38 of the molten tin notch 35 and the welding gold finger 36 can increase the welding area, help the welding of the gold finger 36 and the coil to be better welded, and improve the stability of the welding. Sex, can avoid the occurrence of desoldering. Through the design of the molten tin notch 37, especially the semi-circular design of the second notch 39, the residual of the small tin beads can be avoided and the welding quality can be improved.

The sheet-like body 31 is segmented and includes two differently-shaped segments 40; the two segments 40 are symmetrically disposed along a center point of the first through hole 38, and each of the segments The first end 32 and the second end 33 are included on the segment 40.

A plurality of positioning holes 41 are defined in the first end 32 of the sheet-like body 31 and the second end 33 of the sheet-like body 31, and are inserted and combined with the first positioning post 12 of the carrier A. The second end 32 of the sheet-like body 31 is provided with a base soldering pad 42 for soldering and positioning the lower cover D.

As shown in FIGS. 10 and 11, the yoke C includes a cover-like body 51 composed of a rectangular top plate 52 and four side plates 53.

A second through hole 54 is defined in a middle portion of the rectangular top plate 52. The second through hole 54 is coaxially disposed with the first through hole 8; and the side plate 3 is surrounded by the rectangular top plate 2 along four sides thereof. The integral extension is formed by bending downwardly, and an assembly chamber 55 is formed between the rectangular top plate 52 and the four side plates 53 to define a lower opening for assembling and positioning the carrier A.

Each of the rectangular top plates 52 is further provided with a plurality of fold-over portions 56, and each of the fold-over portions 56 is formed by the rectangular top plate 52 integrally extending downwardly corresponding to the second through-holes 54. And each of the folded portions 56 is evenly distributed around the center of the second through hole 54. By adding a plurality of folds 56 (inner yoke) to the yoke C, the magnetic field force can be effectively increased, and the characteristics of the voice coil motor can be improved.

The folding portion 56 has four sides, which are disposed at 90 degrees to each other, and are in one-to-one correspondence with the four corners of the cover-shaped main body 51.

The four corners of the rectangular top plate 52 are all recessed downward, and the four top corners of the rectangular top plate 52 are formed with a bottom surface 57. By this design, the upper elastic piece can be supported, and the bracket for the support of the upper elastic piece in the existing voice coil motor can be omitted, which can reduce the material cost, reduce the process, and improve the overall assembly of the product. Accuracy, which in turn increases the yield.

The rectangular top plate 52 is further disposed with a plurality of retaining grooves 58 around the second through hole 54 , and each of the retaining grooves 58 is disposed corresponding to two sides of the folded portion 56 for allowing The dispensing operation when the upper elastic piece is connected to the carrier A.

As shown in FIG. 12 to FIG. 14 , the lower cover D is mounted on the lower opening of the yoke C, and includes a rectangular flat cover 61. The middle of the flat cover 61 defines a third through hole 62. The third through hole 62 is coaxially disposed with the second through hole 54; wherein

The upper surface 63 of the flat cover 61 is provided with four second positioning posts 64, a plurality of heat-melting columns 65 and a dust-proof ring 66. Each of the second positioning posts 64 corresponds to the upper surface 63. Four corners for connecting and positioning the yoke C; each of the heat-melting columns 65 is convexly disposed for welding to position the lower elastic piece B; the dustproof ring 66 is disposed around the third through hole 62 And the third through hole 62 is concentric with the third through hole 62, and functions as the carrier A.

The lower surface 67 of the flat cover 61 is provided with a bottom surface groove 68 around the third through hole 62. The bottom surface groove 68 is provided with three bottom bosses 69, and each bottom boss 69 surrounds the first surface. The three through holes 62 are disposed at an angle of 120 degrees to each other, and the lines constituting the three are an equilateral triangle. With this design, on the one hand, it is only necessary to ensure the surface parallelism and flatness of the three bottom bosses 69. Compared with the entire bottom surface groove 68, the present invention greatly reduces the requirements for surface parallelism and flatness. The area reduces the requirements on the mold and reduces the production cost; on the other hand, the convex design of the bottom boss 69 and the "triangle" arrangement can also facilitate the customer's enterprise to turn the voice coil motor and camera. Other components (such as brackets) are connected and positioned to improve stability after positioning.

The upper surface 63 of the flat cover 61 is further provided with an anti-rotation bump 70. The anti-rotation bump 70 is disposed corresponding to the anti-rotation block 16 on the carrier A, and the two are used for positioning. The carrier A.

The upper surface 63 of the flat cover 61 is further provided with a pre-pressing protrusion 71, which is disposed in cooperation with the pre-pressing protrusion 17 on the carrier A, and the two cooperate to Lower the tab B to produce a pre-deformation. By pre-deforming it will help the carrier A to have a slight displacement when the coil is suddenly energized, without causing damage to the carrier A.

The lower surface 67 of the flat cover 61 is further provided with a plurality of PIN pins 72 for electrically coupling other components of the camera.

The periphery of the upper surface 63 of the lower cover D is recessed to form a rectangular annular positioning groove 73, and the yoke C is inserted into the annular positioning groove 73 with the bottom of the four side plates 53 thereof, and each The inner side of the side plate 53 is fitted to the groove wall of the annular positioning groove 73 to achieve the assembly of the yoke C and the lower cover D;

The joint portion of each of the side plates 53 and the annular positioning groove 73 is connected by an adhesive to achieve positioning of the yoke C and the lower cover D.

The annular positioning groove 73 is located at the outermost edge of the upper surface 63 of the lower cover D, and the annular positioning groove 73 is configured to include only the groove wall on the inward side. The joint portion includes a contact portion between a bottom of each of the side plates 53 and a groove bottom of the annular positioning groove 73, and further includes an inner side of each of the side plates 53 and a groove wall of the annular positioning groove 73. Contact.

The above embodiments are merely illustrative of the technical concept and the features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the present invention and to implement the present invention, and the scope of the present invention is not limited thereto. Equivalent variations or modifications made in accordance with the spirit of the invention are intended to be included within the scope of the invention.

Claims

A voice coil motor characterized by:

The carrier, the upper elastic piece, the lower elastic piece, the yoke iron and the lower cover;

The carrier includes a body, and a first through hole is formed in the upper and lower sides of the base body for assembling the lens of the camera; the upper end surface of the base body is provided with a plurality of first dispensing grooves, and each of the first dispensing points a slot is recessed on the upper end surface, and an upper elastic piece of the voice coil motor is positioned by adhesive connection; a plurality of first positioning posts and a plurality of second dispensing grooves are disposed on the lower end surface of the base body; Positioning post protruding from the lower end surface against the lower cover of the positioning voice coil motor; each second dispensing groove is recessed on the lower end surface, and the lower elastic piece of the voice coil motor is positioned by adhesive connection; wherein At least three stroke control protrusions are further disposed on the upper end surface of the base body, and each of the stroke control protrusions is evenly distributed along the circumferential direction of the first through hole to form a supporting surface, and the surface of each stroke control protrusion The parallelism is uniform; the travel of the carrier in the up and down direction is defined by the housing of the positioning voice coil motor; wherein the outer side wall of the seat body is provided with a groove in the up and down direction, and the outer side wall is further provided with At least one limit block; in addition, the outer side wall Also a plurality of outwardly projecting anti-rotation stoppers provided, each anti-rotation stopper positioned opposite the yoke of a voice coil motor; a lower end of said seat body is provided with a convex surface bump preload acting on the lower elastic piece;

The lower elastic piece includes a sheet-shaped main body having a first end connected to the carrier, and a second end connected to the lower cover; the first end and the first end The second ends are connected by a bent string of the elastic piece; the first end of the sheet-shaped body is provided with a flat soldering pad, the soldering pad is attached to the end surface of the carrier, and is wound with the carrier The coil is soldered and positioned; wherein the soldering pad comprises a soldering tin notch and at least one soldering gold finger, the soldering tin notch comprises a first notch and a second notch; the first notch is rectangular, each of the soldering The gold fingers are disposed in parallel in the first notch; the second notch is semi-circular, and one side thereof is disposed in communication with the first notch through a connecting opening;

The yoke includes a cover body, the cover body is composed of a rectangular top plate and four side plates; a second through hole is defined in a middle portion of the rectangular top plate, and the second through hole is the same as the first through hole The shaft plate is formed by the rectangular top plate integrally extending downward along the four sides thereof, and forming an assembly chamber between the rectangular top plate and the four side plates to define a lower opening for assembly positioning. The carrier; wherein the middle portion of the rectangular top plate is further provided with a plurality of folding portions, and each of the folding portions is formed by the rectangular top plate integrally extending downwardly corresponding to the second through hole, and Each of the folded portions is evenly distributed around a center of the second through hole;

The lower cover is mounted on the lower opening of the yoke, and includes a rectangular flat cover. The middle of the flat cover defines a third through hole, and the third through hole and the second through hole a coaxial arrangement; wherein, the upper surface of the flat cover body is provided with four second positioning posts, a plurality of heat-melting columns and a dustproof ring; each of the second positioning posts respectively corresponding to the upper surface of the flat cover body Four corners for connecting and positioning the yoke; each of the heat-melting columns is upwardly convex for welding to position the lower elastic piece; the dustproof ring is disposed around the third through hole, The third through hole is the same as the center of the circle; the lower surface of the flat cover body is provided with three bottom bosses, and each bottom boss is disposed around the third through hole, and is arranged at an angle of 120 degrees to form a connection of the three. a triangle

The upper surface of the lower cover is recessed to form a rectangular annular positioning groove, and the yoke is inserted into the annular positioning groove with the bottoms of the four side plates, and the inner side of each of the side plates is fitted The groove wall of the annular positioning groove is assembled with the yoke and the lower cover; the joint portion of each of the side plates and the annular positioning groove is connected by an adhesive to achieve the yoke and The positioning of the lower cover.
A voice coil motor according to claim 1, wherein each of said anti-rotation stoppers is provided around a seat body of said carrier in a circumferential direction.
The voice coil motor according to claim 1, wherein a bobbin is protruded outwardly from a sidewall of the outer surface of the carrier, and the bobbin is used for positioning a wire end of the voice coil motor coil.
The voice coil motor according to claim 1, wherein the sheet-like body of the lower elastic piece is segmented, and comprises two divided pieces of the same shape; and the two divided pieces are along the first pass The center point of the hole is symmetrically disposed, and each of the segment bodies includes the first end and the second end.
The voice coil motor according to claim 1, wherein the second end of the sheet-like body of the lower elastic piece is provided with a base soldering pad.
The voice coil motor according to claim 1, wherein the yoke has four folded portions which are disposed at 90 degrees to each other and which correspond one-to-one with the four corners of the cover-shaped main body.
The voice coil motor according to claim 1, wherein the four corners of the rectangular top plate of the yoke are each recessed downward, and the four corners constituting the rectangular top plate are formed with a lower surface.
The voice coil motor according to claim 1, wherein a rectangular top plate of the yoke is further provided with a plurality of retaining grooves around the second through hole, and each of the retaining grooves corresponds to the Set on both sides of the fold.
The voice coil motor according to claim 1, wherein the upper surface of the flat cover of the lower cover is further provided with an anti-rotation bump corresponding to the anti-rotation on the carrier A stop arrangement that cooperates to position the carrier.
The voice coil motor according to claim 1, wherein the upper surface of the flat cover of the lower cover is further provided with a pre-pressing protrusion, and the pre-pressing protrusion and the pre-embossing on the voice coil motor carrier The block fit arrangement, the two acting together on the lower shrapnel to produce a pre-deformation.