TW201436430A - Voice coil motor - Google Patents

Abstract

A voice coil motor is available for the installation of a lens, and for driving the lens movement to focus. The voice coil motor includes a fixing assembly, a moving assembly and an elastic assembly. The fixing assembly includes a shell and magnetic elements inside the shell. The moving assembly includes a lens carrier and a coil disposed on the lens carrier. The lens carrier is movably disposed in the shell. The coil is fixed on the lens carrier corresponding to the position of the magnetic elements. The elastic assembly is disposed between the fixing assembly and the moving assembly. The shell has an opening and a plurality of magnetic permeability plates disposed around the edge of the corner of the opening. Each of the magnetic permeability plates extending between the lens carrier and the coil corresponds to the position of the gap formed by the arrangement of the magnetic elements. Each of the magnetic permeability plates has a body portion and a pair of wing portion extending from the body portion.

Description

Voice coil motor actuator

The present invention relates to a voice coil motor, and more particularly to a voice coil motor actuator.

According to the conventional voice coil motor (VCM), there is a metal outer frame, and a metal outer frame is provided with a magnet, but no magnet is provided at four corners in the metal outer frame, so that the electromagnetic field generated by the coil At the corner, it is impossible to repel or attract the magnet, which creates a waste of electromagnetic field and reduces the efficiency of driving. Therefore, for a voice coil motor developed toward miniaturization, relatively power consumption can achieve the purpose of driving.

Therefore, how to improve the above problems through structural design has become an important issue that this business person wants to solve. Therefore, the prior art has applied for a patent for a magnet holder structure of an autofocus module, the publication number of which is 201219956, which is shown in the contents of the publication and the third figure thereof, at the four corner positions of the outer frame 30, An L-shaped plate 40 bent inwardly is disposed and extends into the accommodating space 41 formed between the bearing seat 34 and the coil 38, and the L-shaped plate 40 is disposed between the two magnets 32 via the coil 38. Preferably, the L-shaped plate 40 is integrally formed with the outer frame 30 to enhance the electromagnetic field-driven magnetic efficiency of the coil 38 at the corner edge.

However, it is checked that the L-shaped plate only has a space formed between the two magnets via the coil, and the thrust generated by the voice coil motor is proportional to the current flowing through the coil, and the corresponding area of the coil and the magnet and the magnetic flux also affect. As a result of the thrust, the magnet holder of the prior art autofocus module still has room for improvement, so the inventor of the present invention thought how to make the magnetic field ensure the direction and make the magnetic force line passing through the coil denser and strengthen the thrust. In conjunction with the application of the theory, a present invention which is reasonable in design and effective in improving the above problems is proposed.

An embodiment of the present invention provides a voice coil motor actuator capable of enhancing a magnetic permeability effect, a drop resistance, and a dustproof effect.

In order to achieve the above, the present invention provides a voice coil motor actuator for mounting a lens and driving the lens for focusing. The voice coil motor actuator includes: a fixed assembly including a a housing and a magnetic component group disposed on the inner side of the housing; a movable assembly includes a cartridge holder and a coil disposed around the outside of the cartridge holder, the cartridge holder being movably disposed in the housing The coil is fixed to the cartridge holder and corresponds to the position of the magnetic element group; and a spring assembly abuts the fixing component and the movable component; wherein the housing has an opening and a corner at a periphery of the opening Each of the conductive magnetic shields is disposed at a position extending between the cartridge holder and the coil and corresponding to a gap formed by the spatial arrangement of the magnetic component group, and each of the guides The magnetic block has a body portion and a pair of wings extending from both sides of the body portion.

In order to achieve the above, the present invention further provides a voice coil motor actuator for mounting a lens and driving the lens for focusing, the voice coil motor actuator comprising: a fixed component, including a housing and a magnetic component group disposed on the inner side of the housing; a movable assembly includes a loading cylinder and a coil disposed around the outer side of the cartridge housing, the cartridge housing is movably disposed in the housing The coil is fixed to the cartridge holder and corresponds to the position of the magnetic element group; and a spring group abuts the fixing component and the movable component; wherein the housing has an opening and is at the periphery of the opening Each of the corners is provided with a magnetic shielding piece, each of which extends between the loading base and the coil and corresponding to a position of a gap formed by the spatial arrangement of the magnetic element group, and each of the The magnetic shielding piece has a body portion and a pair of wing portions extending from both sides of the body portion; a base is disposed at the bottom of the housing; a dustproof ring is disposed on the base, and the dustproof ring and the base are An annular dustproof groove is formed between the two.

The invention also provides a method for manufacturing a voice coil motor actuator, comprising the steps of: (a) providing a casing, a bolster, an upper elastic piece and a magnetic component group, the casing The body is used as the structural reference member of the step (a), and the pedestal, the upper elastic piece and the magnetic element are assembled in the casing to form a first pre-assembly; (b) a cylindrical seat is provided; a coil and a spring piece, the tube holder is used as a structural reference member of the step (b), and the coil and the lower elastic piece are sequentially mounted on the barrel holder to form a second pre-assembly; (c) providing a a base, and the second pre-assembly completed in step (a) and the second pre-assembly completed in step (b) and the base are assembled into a semi-finished product of the voice coil motor actuator; and (d) using a blow After the semi-finished product of the voice coil motor actuator is cleaned by the air mode and the fluid, a dust ring is loaded into the base and the drum seat is raised to deform the lower elastic piece abutting the drum seat to generate a Preload is applied to the cartridge holder.

In summary, the voice coil motor actuator provided by the embodiment of the present invention has a main body portion and a pair of wings extending from both sides of the body portion through the magnetic shielding piece, which can effectively strengthen the coil. The electromagnetic field driven by the electromagnetic field at the corner, the extended wing enhances the magnetic permeability and magnetic flux, and the magnetic field can make the magnetic field ensure the direction and make the magnetic flux through the coil more magnetically guided by the magnetic flux of the wing of the magnetic shield. Intensive, the voice coil motor actuator of the present invention is capable of producing a more stable and greater thrust at the same current. Furthermore, the outer side wall of the cartridge holder is formed with a plurality of contact faces and cooperates with the multi-faceted structure formed by the magnetic shield, so that the contact surface of the magnetic shield can be stably abutted with the mounting surface of the cartridge holder to enhance the fall and fall resistance. And the torsion force when the lens is twisted. In addition, an annular dustproof groove is formed between the dustproof ring and the base to enhance the dust collecting effect.

1‧‧‧Fixed components

11‧‧‧Shell

111‧‧‧ openings

112‧‧‧magnetic shield

1121‧‧‧ Body Department

1122‧‧‧ wing

1123‧‧‧ fillet

12‧‧‧Magnetic component group

13‧‧‧Cushing frame

2‧‧‧Active components

21, 21a‧‧‧

211‧‧‧Contact surface

22‧‧‧ coil

3‧‧‧Shrap group

31‧‧‧Upper film

32, 32a‧‧‧ shrapnel

311, 321, 321a‧‧‧ fixed end

312, 322, 322a‧‧‧ active end

4‧‧‧Base

5‧‧‧ dust ring

G1‧‧‧ accommodating space

G2‧‧‧Dust groove

1 is a perspective assembled view of a voice coil motor actuator of the present invention.

2 is an exploded perspective view of the first pre-assembly of the voice coil motor actuator of the present invention.

3 is an exploded perspective view of a second pre-assembly of the voice coil motor actuator of the present invention.

4 is an exploded perspective view of the voice coil motor actuator of the present invention.

Figure 5 is a plan perspective view of the voice coil motor actuator of the present invention.

Figure 6 is a perspective cross-sectional view of the voice coil motor actuator of the present invention.

Figure 7 is a perspective view of the dust ring of the voice coil motor actuator of the present invention when it is intended to be inserted into the base.

Figure 8 is a plan cross-sectional view showing an annular dustproof groove formed between the dustproof ring of the voice coil motor actuator of the present invention and the base.

Fig. 9 is a plan sectional view showing a dust ring of a voice coil motor actuator according to another embodiment of the present invention when it is intended to be mounted in a base.

Figure 10 is a plan cross-sectional view showing the drum seat of the voice coil motor actuator of Figure 9 when the dust ring is raised in height and the lower spring piece is deformed.

In order to further understand the technology, method and effect of the present invention in order to achieve the intended purpose, reference should be made to the detailed description and drawings of the present invention. It is to be understood that the appended claims

Please refer to FIG. 1, which is a perspective assembled view of a voice coil motor actuator of the present invention. The present invention provides a voice coil motor actuator that can be mounted on a lens and that drives the lens to focus. The voice coil motor actuator of the present invention basically comprises a fixed component 1, a movable component 2, and a shrapnel set 3. Further, the voice coil motor actuator of the present invention may further include a base 4 and a dustproof ring 5.

Please refer to Figure 2 to Figure 4. The fixing assembly 1 basically comprises a housing 11 and a magnetic component group 12 wound around the inside of the housing 11. The material of the housing 11 is preferably made of a metal material, and the magnetic component group 12 is preferably composed of a plurality of magnets. In this embodiment, the magnetic component group 12 is composed of four magnets, and the magnets are respectively fixed to the magnets. The inner side wall of the housing 11.

The movable assembly 2 basically includes a cartridge holder 21 and a coil 22 wound around the outside of the cartridge holder 21. Wherein, the cartridge holder 12 is movably disposed in the housing 11, and the coil 22 is fixed to the cartridge holder 12 and corresponds to the position of the magnetic element group 12, so that the coil 22 is energized to generate magnetic force with each other.

The shrapnel group 3 abuts on the fixed component 1 and the movable component 2. The elastic piece group 3 includes a top elastic piece 31 and a lower elastic piece 32, and the upper elastic piece 31 has a fixed end 311. And the movable end 312, the lower elastic piece 32 also has a fixed end 321 and a movable end 322. The movable end 322 of the lower elastic piece 32 elastically abuts against the bottom edge of the cartridge holder 21, and the fixed end 321 can be fixed to the base 4 or the housing 11. The movable end 312 of the upper elastic piece 31 elastically abuts against the top edge of the loading base 12, and the fixing assembly 1 further includes a pedestal 13 which can be pressed against the fixed end 311 of the elastic piece 31 with the magnetic element group 12. . The shrapnel group 3 can serve as a conductive electrode of the coil 22, and when the coil 22 is energized, the shrapnel group 3 can linearly control the height of the cartridge holder 12 and provide a predetermined elastic restoring force. It should be noted that the fixed ends 311 and 321 and the movable ends 312 and 322 of the shrapnel group 3 of the present invention are not limited to the illustrated embodiments, and may be appropriately changed according to actual design requirements, as long as the movable end is deformed. The position and the shrapnel or shrapnel group that ensure the smoothness during the operation are all in the category of the shrapnel group of the present invention.

Referring to FIG. 5 and FIG. 6 , the housing 11 of the present embodiment has a square hollow shape, and the housing 11 has an opening 111 , and a magnetic shielding piece 112 is disposed at a corner of the periphery of the opening 111 . In the embodiment, the periphery of the opening 111 is formed with four corners, so that four magnetic shielding pieces 112 are provided, and the blocking pieces 112 are preferably integrally formed with the housing 11.

Furthermore, the magnetic shielding pieces 112 each extend in the accommodating space G1 formed between the outer side wall of the ferrule holder 21 and the coil 22, and correspond to the position of the gap formed by the spatial arrangement of the magnetic element group 12 (as shown in the figure). 5). Each of the blocking pieces 112 has a body portion 1121 and a pair of wings 1122 extending from both sides of the body portion. Since the thrust generated by the voice coil motor actuator due to the magnetic force is proportional to the current flowing through the coil 22, the corresponding area of the coil 22 and the magnetic element group 12 and the magnetic flux also affect the thrust result, and the thrust result is related to the voice coil motor actuation. The characteristics of the device, the reaction time, and the power consumption, but the space of the magnets of the magnetic element group 12 is arranged at four corners to form a gap, which affects the magnetic field efficiency of the electromagnetic field generated by the coil 22, so the magnetic permeability of the present invention The blocking piece 112 not only has a position corresponding to the gap formed by the magnet, but also has a pair of wings 1112 extending from both sides of the body portion 1121, and the two wings 1112 are away from the body portion 1121 and face each other. The side of the magnet extends in parallel, borrowing Therefore, compared with the prior art, not only can the magnetic field efficiency of the electromagnetic field driven by the coil 22 at the corner be effectively enhanced, but the extended wing portion 1112 further enhances the magnetic permeability and the magnetic flux, and the magnetic field is guided by the magnetic shield 112. The effect is that the magnetic field ensures direction and the magnetic lines of force passing through the coil 22 are denser, making the voice coil motor actuator of the present invention produce a more stable and greater thrust at the same current.

The outer side wall of the charging base 21 corresponding to the four magnetic shielding pieces 112 is formed with four contact surfaces 211 respectively matched with the multi-faceted structure formed by the magnetic shielding pieces 112, so that the motor of the voice coil motor falls At this time, the magnetic shielding piece 112 can stably abut against the contact surface 211 of the cartridge holder 21 without being easily deformed, and the strength of the entire voice coil motor actuator can be enhanced. Moreover, when the lens is twisted to the cartridge holder 21, the contact surface 211 of the magnetic shield 112 and the cartridge holder 21 has a multi-faceted structure capable of withstanding a large torque and is less prone to deformation and damage of the elastic sheet group 3.

It should be noted that, in this embodiment, the housing 11 and the magnetic shielding piece 112 are integrally formed by metal material drawing, and when the drawing is formed, the wing portion 1122 of the magnetic conductive piece 112 is easily concentrated by stress. In the case of a fracture problem, it is necessary to remove the meat to avoid the fracture problem, so that a rounded corner 1123 is formed after the top edge of each wing 1122 is removed to increase the strength and avoid the fracture problem.

Referring to FIGS. 7 and 8, the voice coil motor actuator of the present invention further includes a base 4 and a dust ring 5. The base 4 is disposed at the bottom of the casing 11. The dustproof ring 5 is disposed on the base 4, and an annular dustproof groove G2 is formed between the dustproof ring 5 and the base 4 to enhance the dust collecting effect. 5 The bonding method with the base 4 can be double-sided adhesive or coated with a viscous substance, whereby foreign matter or falling dust can adhere or stick to the periphery of the dustproof groove G2 without affecting the image feeling under the dustproof ring 5. Imaging quality of the detector (not shown).

Please refer to FIG. 9 and FIG. In another embodiment, the lower elastic piece 32a is disposed in parallel on the top edge of the base 4, and the movable end 322a of the lower elastic piece 32a abuts against the bottom edge of the loading base 21, and the fixed end 321a is fixed to the top edge of the base 4. When the dustproof ring 5 is mounted on the base 4, the cartridge seat 21 can be topped and the abutment 32 can be abutted under the bottom edge of the cartridge holder 21. The movable end 322a is deformed to provide a pre-pressure applied to the cartridge holder 21, which enables the cartridge holder 21 to be more stable during up and down movement. The invention utilizes the dustproof ring 5 as the design of the assembled top height loading cylinder seat 21, and uses the dustproof ring 5 to top the high loading cylinder seat 21, so that the lower elastic piece 32 generates pre-pressure, and the dustproof ring 5 can be changed according to actual design requirements. The height causes the pre-stress of the lower elastic piece 32 to be changed, and is more elastic in design.

The manufacturing method of the present invention for manufacturing a voice coil motor actuator, please refer to FIG. 2 to FIG. 4 and with reference to FIG. 7 , firstly performing step (a) to provide a casing 11 , a bolster 13 , an upper elastic piece 31 and a magnetic component group 12, the housing 11 as a structural reference member of the step (a) and sequentially mounting the pedestal 13, the upper elastic piece 31 and the magnetic component group 12 inside the casing 11 to become a first A pre-assembly (Figure 2). In the step (b), a cartridge holder 21, a coil 22 and a lower elastic piece 32 are provided. The cartridge holder 21 serves as a structural reference member of the step (b) and sequentially mounts the coil 22 and the lower elastic piece 32. In the cartridge holder 21, it becomes a second pre-assembly (Fig. 3). Furthermore, in the step (c), a base 4 is provided, and the first pre-assembly completed in the step (a) and the second pre-assembly completed in the step (b) are assembled with the base 4 as a voice coil motor actuator. Semi-finished products. It should be noted that when the steps (a), (b) and (c) are completed, the semi-finished products of the voice coil motor actuator may be generated by foreign matter and dust, and thus may be easily removed in the step (d). After the semi-finished product of the voice coil motor actuator is cleaned with a fluid, a dust-proof ring 5 is installed in the base 4 (as shown in FIG. 7), but the dust-proof ring 5 can also be installed according to design requirements. The dustproof ring 5 and the base 4 of the present invention are of a separate design, so that the semi-finished product of the assembled voice coil motor actuator can be conveniently cleaned, and the surface of the dustproof ring 5 has a viscous substance and is fitted into the base 4 by a fitting manner to prevent dust. The ring 5 can be adhered to the foreign matter dust, which is beneficial to the subsequent dustproof effect, and when the dustproof ring 5 is assembled into the base 4, the top height can be pre-stressed, and the dust ring 5 assembled at different heights can also facilitate the pre-stress. Modifications.

In summary, the voice coil motor actuator provided by the embodiment of the present invention has a body portion disposed through a corner of the casing and a pair of wings extending from both sides of the body portion. The design not only effectively enhances the magnetic field efficiency of the electromagnetic field driven by the coil at the corner, but also extends the wing to enhance the magnetic permeability and flux. And the magnetic field can make the magnetic field ensure the direction and make the magnetic lines of force passing through the coil denser by the magnetic conductive effect of the magnetic shielding piece, so that the voice coil motor actuator of the invention produces a more stable and larger under the same current. thrust. Furthermore, the outer side wall of the tube holder is formed with a plurality of contact surfaces and cooperates with the multi-faceted structure formed by the magnetic shielding piece, so that the contact surface of the magnetic shielding piece can be stably abutted with the mounting surface of the tube holder to enhance the fall and fall and Torque bearing when the lens is twisted. In addition, an annular dustproof groove is formed between the dustproof ring and the base, so that foreign matter or falling dust can adhere or adhere to the dustproof groove, and the dust collecting effect can be effectively enhanced.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalents of the present invention and the equivalents of the drawings are all included in the present invention. Within the scope of protection, it is given to Chen Ming.

11‧‧‧Shell

112‧‧‧magnetic shield

1121‧‧‧ Body Department

1122‧‧‧ wing

1123‧‧‧ fillet

12‧‧‧Magnetic component group

21‧‧‧Loading seat

211‧‧‧Contact surface

22‧‧‧ coil

Claims (15)

A voice coil motor actuator for mounting a lens and driving the lens for focusing, the voice coil motor actuator comprising: a fixing assembly including a housing and a winding around the inside of the housing a magnetic component set; a movable component comprising a loading base and a coil wound around the outer side of the loading base, the charging cylinder is movably disposed in the housing, the coil is fixed to the mounting base and corresponds to a position of the magnetic element group; and a spring piece group abutting the fixing component and the movable component; wherein the housing has an opening, and a magnetic shielding piece is disposed at a corner of the periphery of the opening, The magnetic flux barriers each extend between the cartridge holder and the coil and correspond to a position of a gap formed by the spatial arrangement of the magnetic component groups, and each of the magnetic shielding sheets has a body portion and a pair of a wing extending on both sides of the body portion. The voice coil motor actuator of claim 1, wherein the magnetic element group comprises a plurality of magnets, and the pair of wings of each of the magnetic flux barriers are parallel to a corresponding magnet side . The voice coil motor actuator of claim 2, wherein the top edges of the wings are respectively formed with a rounded corner. The voice coil motor actuator of claim 1, wherein the elastic piece group comprises a top elastic piece and a lower elastic piece, and the upper elastic piece and the lower elastic piece respectively have a fixed end and a movable end. The voice coil motor actuator of claim 4, wherein the movable end of the lower elastic piece is elastically abutted against the bottom edge of the cartridge holder, and the fixed end of the lower elastic piece is fixed to the base and the housing. In one of the cases, the movable end of the upper elastic piece is elastically abutted against the top edge of the loading base, and the fixing component further comprises a bolster, and the bolster is pressed against the fixed end of the upper elastic piece. The voice coil motor actuator of claim 1, wherein the opening periphery of the housing is formed with four corners, and the magnetic shielding sheets are integrally drawn and molded to the housing. Four corners. The voice coil motor actuator of claim 1, wherein the outer side wall of the cartridge holder is formed with a plurality of contact surfaces respectively corresponding to the magnetic shielding sheets and the structure of the magnetic shielding sheets Match. A voice coil motor actuator for mounting a lens and driving the lens for focusing, the voice coil motor actuator comprising: a fixing assembly including a housing and a winding around the inside of the housing a magnetic component set; a movable component comprising a loading base and a coil wound around the outer side of the loading base, the charging cylinder is movably disposed in the housing, the coil is fixed to the mounting base and corresponds to a position of the magnetic element group; a shrapnel group abutting the fixing component and the movable component; a base disposed at the bottom of the casing; and a dustproof ring disposed on the base, and the dustproof ring and the base Forming an annular dustproof groove; wherein the housing has an opening, and each of the corners of the periphery of the opening is provided with a magnetic shielding piece, each of the magnetic shielding pieces extending from the mounting base and The coils correspond to positions of the gap formed by the spatial arrangement of the magnetic element groups, and each of the magnetic shielding sheets has a body portion and a pair of wings extending from both sides of the body portion. The voice coil motor actuator of claim 8, wherein the magnetic element group comprises a plurality of magnets, and the pair of wing portions of each of the magnetic shielding sheets are parallel to a corresponding magnet side . The voice coil motor actuator of claim 9, wherein the wing top edges are respectively formed with a rounded corner. The voice coil motor actuator of claim 8, wherein the elastic piece group comprises a top elastic piece and a lower elastic piece, and the upper elastic piece and the lower elastic piece respectively have a fixed end and a movable end. The voice coil motor actuator of claim 11, wherein the movable end of the lower elastic piece is elastically abutted against the bottom edge of the cartridge holder, and the fixed end of the lower elastic piece is fixed to the base and the housing. In one of the cases, the movable end of the upper elastic piece is elastically abutted against the top edge of the loading base, and the fixing component further comprises a bolster, and the bolster is pressed against the fixed end of the upper elastic piece. The voice coil motor actuator of claim 8, wherein the opening periphery of the housing is formed with four corners, and the magnetic shielding sheets are integrally drawn and molded to the housing. Four corners. The voice coil motor actuator of claim 8, wherein the outer side wall of the cartridge holder is formed with a plurality of contact surfaces respectively corresponding to the magnetic shielding sheets and the structure of the magnetic shielding sheets Match. A manufacturing method of a voice coil motor actuator, comprising the steps of: (a) providing a casing, a bolster, an upper elastic piece and a magnetic component group, wherein the casing serves as a structural reference member of the step (a) and Forming the pedestal, the upper elastic piece and the magnetic component in the interior of the housing to form a first pre-assembly; (b) providing a cartridge holder, a coil and a lower elastic piece, the cartridge holder as a step a structural reference member of (b) and sequentially mounting the coil and the lower elastic piece on the barrel holder to form a second pre-assembly; (c) providing a base and completing the step (a) a pre-assembly and the second pre-assembly completed in step (b) and the base assembly form a semi-finished product of the voice coil motor actuator; and (d) cleaning the voice coil motor actuator by means of air blowing and fluid After the semi-finished product, a dust ring is loaded into the base and the cartridge holder is raised to deform the lower elastic piece abutting the cartridge holder to generate a pre-pressure applied to the cartridge holder.