A roller OIS voice coil motor

Abstract

The present invention discloses a roller OIS voice coil motor, which includes a hollow base, a coil embedded around the base, a circuit board disposed on the outer periphery of the base, a second carrier disposed on the hollow inner cavity of the base, a first carrier disposed on the second carrier, a carrier disposed on the first carrier, a first magnet group embedded in the carrier, and a second magnet group embedded in the second carrier; a dovetail track for enabling the first carrier to slide relative to the second carrier is provided between the second carrier and the first carrier, a dovetail track for enabling the carrier to slide relative to the first carrier is provided between the first carrier and the carrier, the first magnet group, the second magnet group and the coil are opposite to each other, and when the coil is energized, a magnetic field is generated and under the action of the magnetic field, the roller OIS voice coil motor realizes actions along the X-axis, Y-axis and Z-axis. The roller OIS voice coil motor of the present invention is small in size, high in precision, and will not have the phenomenon of ball jamming.

Description

Technical Field

[0001] The present invention relates to the technical field of voice coil motors, and particularly to a roller OIS voice coil motor. Background Art

[0002] An OIS (Optical Image Stabilizer) voice coil motor, commonly known as an optical anti-shake voice coil motor, is a device that converts electrical energy into mechanical energy and can achieve linear and limited swing angle movements. When applied to the lens of an electronic product, it can not only achieve the automatic focusing function of the lens, but also effectively overcome the image blurring caused by lens shake.

[0003] Traditional OIS voice coil motors include OIS coil groups, magnet groups, and parts such as ball bearings and reed pieces for preventing lens shake. The ball bearings are spherical and run around randomly in a limited space, which is prone to jamming, and the springs can easily complicate the assembly process, resulting in poor product performance. Summary of the Invention

[0004] The purpose of the present invention is to address the above problems by providing a roller OIS voice coil motor, optimizing the structure, reducing the occurrence of jamming, lowering the processing difficulty and cost, improving product performance, and simplifying the process.

[0005] To achieve the above purpose, the technical solution of the present invention is as follows:

[0006] A roller OIS voice coil motor includes a hollow base, a coil embedded around the base, a circuit board disposed on the outer periphery of the base, a second carrier disposed in the hollow inner cavity of the base, a first carrier disposed on the second carrier, a carrier disposed on the first carrier, a first magnet group embedded in the carrier, and a second magnet group embedded in the second carrier; a dovetail slideway is provided between the second carrier and the first carrier to enable the first carrier to slide relative to the second carrier, and a dovetail slideway is provided between the first carrier and the carrier to enable the carrier to slide relative to the first carrier. The first magnet group, the second magnet group, and the coil are opposite to each other. When the coil is energized, a magnetic field is generated, and under the action of the magnetic field, the roller OIS voice coil motor realizes movements along the X-axis, Y-axis, and Z-axis.

[0007] As an improvement to the above technical solution, first support blocks are arranged around the inner cavity of the second carrier. The first support blocks are paired in twos, and the opposite faces of the two first support blocks in a group are inclined to form a first inclined surface. A roller groove is arranged along the slope direction of the first inclined surface, and a circumferentially rotatable roller is embedded in the roller groove; corresponding first inclined grooves are arranged at the four corners of the bottom surface of the first carrier. The inclined surfaces of the first inclined grooves correspond to the first inclined surfaces of the first support blocks so that the first carrier and the second carrier are in contact through the rollers; the two first inclined surfaces in a group are opposite to form a dovetail structure that is wider at the top and narrower at the bottom. Furthermore, the two rollers in a group form the cross-section of the track for the sliding of the first carrier, and the four rollers in two groups form the dovetail track for the sliding of the first carrier.

[0008] As an improvement to the above technical solution, second support blocks protrude from the four corners of the top surface of the first carrier. The second support blocks are paired in twos, and the opposite faces of the two second support blocks in a group are inclined to form a second inclined surface. A roller groove is arranged along the slope direction of the second inclined surface, and a circumferentially rotatable roller is embedded in the roller groove; corresponding second inclined grooves are arranged at the four corners of the bottom surface of the carrier. The inclined surfaces of the second inclined grooves correspond to the second inclined surfaces of the second support blocks so that the carrier and the first carrier are in contact through the rollers; the two second inclined surfaces in a group are opposite to form a dovetail structure that is wider at the top and narrower at the bottom. Furthermore, the two rollers in a group form the cross-section of the track for the sliding of the carrier, and the four rollers in two groups form the dovetail track for the sliding of the carrier.

[0009] As a further improvement to the above technical solution, the first support blocks and the second carrier, and the second support blocks and the first carrier are integrally formed structures. The first inclined surface on the first support block and the second inclined surface of the second support block are perpendicular, so that the dovetail track formed by the four rollers installed on the first inclined surface and the dovetail track formed by the four rollers installed on the second inclined surface are perpendicular to each other. Furthermore, the roller OIS voice coil motor is translated in two different directions.

[0010] As an improvement to the above technical solution, multiple groups of rollers are embedded on two intersecting side surfaces of the second carrier. The multiple groups of rollers are placed horizontally to guide the up-and-down sliding of the second carrier.

[0011] As a further improvement to the above technical solution, the base is a hollow cuboid structure. Side walls protrude from the four sides of the base towards the second carrier. The middle parts of the four side walls are hollowed out to embed coils. The circuit board is arranged on the outer sides of the four side walls and is electrically connected to the coils embedded in the side walls. The second carrier is embedded in the hollow structure surrounded by the four side walls. Among them, two second vertical walls protrude from the two intersecting sides of the second carrier towards the first support carrier. Embedding grooves for embedding the second magnet group are recessed in the two second vertical walls. The second magnet group includes two magnets, which are respectively embedded in the embedding grooves and are opposite to the corresponding coils on the base to generate magnetic induction when energized.

[0012] As a further improvement to the above technical solution, two sets of rollers are arranged on one of the second vertical walls. The two sets of rollers are respectively located on both sides of the embedding groove. Each set of rollers includes two horizontally arranged rollers, and the two rollers are separately arranged. One set of rollers is arranged on the other second vertical wall. One set of rollers includes two horizontally arranged rollers, and the two rollers are separately arranged. The three sets of rollers guide the translational movement of the roller OIS voice coil motor in the Z-axis direction.

[0013] As a further improvement to the above technical solution, the carrier is a hollow cuboid structure. Grooves for embedding the first magnet group are recessed on two intersecting side surfaces of the carrier. The two grooves are opposite to the two embedding grooves. The first magnet group includes two magnets, which are respectively embedded in the grooves and are opposite to the corresponding coils on the base to generate magnetic induction when energized.

[0014] As a further improvement to the above technical solution, the roller OIS voice coil motor further includes a plate-shaped fixing buckle. Clamping plates extending towards the second carrier are arranged at the four corners of the fixing buckle. Clamping protrusions are arranged at the ends of the clamping plates. Clamping grooves are arranged at corresponding positions on the second carrier. When the fixing buckle is buckled on the second carrier, the carrier and the first carrier are loaded in the surrounding structure of the fixing buckle and the second carrier.

[0015] As a further improvement to the above technical solution, a housing is further arranged on the fixing buckle.

[0016] As a further improvement to the above technical solution, patches are arranged outside two of the circuit boards to increase the magnetic field strength between these two circuit boards and the coils. The circuit boards correspond to the second magnet group.

[0017] The working principle of the roller OIS voice coil motor of the present invention is:

[0018] The four rollers on the top of the first carrier face the same direction, and the auxiliary motor translates in one direction. The four rollers between the first carrier and the second carrier face the opposite direction to the aforementioned four rollers, and the auxiliary motor translates in the other direction. The eight rollers assist the movement of the XY axis of the motor. Among the eight rollers, four of them are respectively obliquely arranged at the corresponding four corner edges of the second carrier and the first carrier, and the other four rollers are obliquely arranged at the corresponding four corner edges of the first carrier and the carrier, which can realize the drive avoidance between the second carrier, the first carrier and the carrier. At least two sides of the second carrier are installed with rollers, with 2 groups of rollers installed on one side and 1 group of rollers installed on the other side to assist the movement of the motor in the Z axis direction. The first magnet group corresponds to the second magnet group and the coil. The second magnet group is responsible for the movement of the motor in the Z axis direction, and the reset relies on the magnetic force generated by the second magnet group and the patches on the back of the circuit board. The first magnet group is responsible for the movement of the motor in the XY axis direction.

[0019] Compared with the prior art, the advantages and positive effects of the present invention are:

[0020] The roller OIS voice coil motor of the present invention is small in size and high in precision. Compared with ball bearings, rollers are easy to process and low in price, and the use of rollers will not cause the jamming phenomenon of ball bearings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 is the exploded structure schematic diagram of the present invention;

[0023] Figure 2 is the three-dimensional structure schematic diagram of the second carrier of the present invention;

[0024] Figure 3 is the three-dimensional structure schematic diagram of the first carrier of the present invention;;

[0025] Figure 4 is the installation structure schematic diagram of the rollers on the top surface of the first carrier of the present invention;

[0026] Figure 5 is the installation structure schematic diagram of the rollers on the bottom surface of the first carrier of the present invention;

[0027] Figure 6 is the installation structure schematic diagram of the rollers on the top surface of the second carrier (i.e., the rollers are installed on the second support block) of the present invention;

[0028] Figure 7 Schematic structure of the roller installed on the second vertical wall of the second carrier of the present invention Figure 1 ;

[0029] Figure 8 Schematic structure of the roller installed on the second vertical wall of the second carrier of the present invention Figure 2 ;

[0030] Figure 9 Schematic cross-sectional installation structure of the present invention Figure 1 ;

[0031] Figure 10 Schematic cross-sectional installation structure of the present invention Figure 2 ;

[0032] Figure 11 Schematic cross-sectional installation structure of the present invention Figure 3 . Detailed implementation manners

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention.

[0034] As Figures 1 to 11 shown, the roller OIS voice coil motor in this embodiment includes a hollow base 9, a coil 10 embedded around the base 9, a circuit board 11 arranged on the outer periphery of the base 9, a second carrier 7 arranged in the hollow inner cavity of the base 9, a first carrier 6 arranged on the second carrier 7, a carrier 3 arranged on the first carrier 6, a first magnet group 4 embedded in the carrier 3, and a second magnet group 8 embedded in the second carrier 7; a dovetail slideway is provided between the second carrier 7 and the first carrier 6 to enable the first carrier 6 to slide relative to the second carrier 7, and a dovetail slideway is provided between the first carrier 6 and the carrier 3 to enable the carrier 3 to slide relative to the first carrier 6. The first magnet group 4, the second magnet group 8 and the coil 10 are opposite to each other. When the coil 10 is energized, a magnetic field is generated, and under the action of the magnetic field, the roller OIS voice coil motor realizes actions along the X-axis, Y-axis and Z-axis.

[0035] Around the inner cavity of the second carrier 7, first support blocks 701 are provided. The first support blocks 701 are grouped in pairs. The opposite faces of two first support blocks 701 in a group are inclined to form a first inclined surface 703. A roller groove 702 is provided along the slope direction of the first inclined surface 703, and a circumferentially rotatable roller 5 is embedded in the roller groove 702. At the four corners of the bottom surface of the first carrier 6, first inclined grooves 601 are correspondingly provided. The first inclined grooves 601 have inclined surfaces 602 corresponding to the first inclined surfaces of the first support blocks 701, so that the first carrier 7 and the second carrier 6 are in contact through the rollers. The two first inclined surfaces 703 in a group are opposite to form a dovetail structure that is wider at the top and narrower at the bottom. Furthermore, the two rollers 5 in a group form the cross-section of the track for the sliding of the first carrier 6, and the four rollers 5 in two groups form the dovetail track for the sliding of the first carrier 6.

[0036] At the four corners of the top surface of the first carrier 6, second support blocks 603 protrude. The second support blocks 603 are grouped in pairs. The opposite faces of two second support blocks 603 in a group are inclined to form a second inclined surface 604. A roller groove is provided along the slope direction of the second inclined surface 604, and a circumferentially rotatable roller 5 is embedded in the roller groove. At the four corners of the bottom surface of the carrier 3, second inclined grooves 301 are correspondingly provided. The second inclined grooves 301 have inclined surfaces 302 corresponding to the second inclined surfaces of the second support blocks 603, so that the carrier 3 and the first carrier 6 are in contact through the rollers 5. The two second inclined surfaces 603 in a group are opposite to form a dovetail structure that is wider at the top and narrower at the bottom. Furthermore, the two rollers 5 in a group form the cross-section of the track for the sliding of the carrier 3, and the four rollers 5 in two groups form the dovetail track for the sliding of the carrier 3.

[0037] The first inclined surface 703 on the first support block 701 and the second inclined surface 604 on the second support block 603 are perpendicular, so that the dovetail track formed by the rollers 5 installed on the first inclined surface 703 and the dovetail track formed by the rollers 5 installed on the second inclined surface 604 are perpendicular to each other. Furthermore, the roller OIS voice coil motor can be translated in two different directions.

[0038] On two intersecting side surfaces of the second carrier 7, multiple groups of rollers 5 are embedded. The multiple groups of rollers 5 are horizontally arranged to guide the second carrier 6 to slide in the up and down direction.

[0039] The base 9 has a hollow cuboid structure. Side walls bulge from the four sides of the base 9 towards the second carrier 7. The middle parts of the four side walls are hollowed out to embed coils 10. The circuit board 11 is arranged on the outer sides of the four side walls and is electrically connected to the coils 10 embedded in the side walls. The second carrier 7 is embedded in the hollow structure surrounded by the four side walls. Among them, two second vertical walls 705 bulge from the two intersecting sides of the second carrier 7 towards the first support carrier 3. Embedding grooves 706 for embedding the second magnet group 8 are recessed in the two second vertical walls 705. The second magnet group 8 includes two magnets which are respectively embedded in the embedding grooves and are opposite to the corresponding coils 10 on the base 9 to generate magnetic induction when energized.

[0040] Two sets of rollers 5 are arranged on one of the second vertical walls 705. The two sets of rollers 5 are respectively located on both sides of the embedding groove 706. Each set of rollers 5 includes two horizontally arranged rollers 5 which are separately arranged. One set of rollers 5 is arranged on the other second vertical wall 705. A sensor magnet groove 707 is provided and a sensor magnet 13 is installed through the sensor magnet groove 707. The base 9 is correspondingly installed with a sensor 14. One set of rollers 5 includes two horizontally arranged rollers 5 which are separately arranged. The three sets of rollers 5 guide the translational movement of the roller OIS voice coil motor in the Z-axis direction.

[0041] The carrier 3 has a hollow cuboid structure. Grooves 303 for embedding the first magnet group 4 are recessed on two intersecting side surfaces of the carrier 3. The two grooves 303 are opposite to the two embedding grooves 706. The first magnet group 7 includes two magnets which are respectively embedded in the grooves 303 and are opposite to the corresponding coils 10 on the base 9 to generate magnetic induction when energized.

[0042] The roller OIS voice coil motor further includes a fixing buckle 2 in a plate-like structure. Clamping plates 201 extending towards the second carrier 3 are provided at the four corners of the fixing buckle 2. Clamping protrusions are provided at the ends of the clamping plates 201. Clamping grooves are provided at the corresponding positions of the second carrier 7. When the fixing buckle 2 is buckled on the second carrier 7, the carrier 3 and the first carrier 6 are loaded in the surrounding structure of the fixing buckle 2 and the second carrier 7.

[0043] The fixing buckle 2 is further provided with a housing 1. Patch pieces 12 are provided outside the two circuit boards 11 to increase the magnetic field strength between the two circuit boards 11 and the coils 10. The circuit boards 11 correspond to the second magnet group 8.

[0044] The working principle of the roller OIS voice coil motor of the present invention is:

[0045] The four rollers at the top of the first carrier face the same direction, and the auxiliary motor translates in one direction. The four rollers between the first carrier and the second carrier face the opposite direction to the aforementioned four rollers, and the auxiliary motor translates in the other direction. The eight rollers assist the movement of the motor in the XY-axis direction. Among the eight rollers, four of them are respectively obliquely arranged at the corresponding four corner edges of the second carrier and the first carrier, and the other four rollers are obliquely arranged at the corresponding four corner edges of the first carrier and the carrier, which can achieve the drive avoidance between the second carrier, the first carrier and the carrier. At least two sides of the second carrier are installed with rollers, with two sets of rollers installed on one side and one set of rollers installed on the other side to assist the movement of the motor in the Z-axis direction. The first magnet group, the second magnet group and the coil correspond to each other. The second magnet group is responsible for the movement of the motor in the Z-axis direction, and the reset depends on the magnetic force generated by the second magnet group and the patches on the back of the circuit board. The first magnet group is responsible for the movement of the motor in the XY-axis direction.

[0046] The roller OIS voice coil motor of the present invention is small in size and high in precision. Compared with ball bearings, rollers are easy to process and inexpensive, and the use of rollers will not cause the jamming phenomenon of ball bearings.

Claims

1. A roller OIS voice coil motor, characterized in that: It includes a hollow base, a coil embedded around the base, a circuit board disposed on the outer periphery of the base, a second carrier disposed in the hollow inner cavity of the base, a first carrier disposed on the second carrier, a carrier disposed on the first carrier, a first magnet group embedded in the carrier, and a second magnet group embedded in the second carrier; a dovetail track is provided between the second carrier and the first carrier to enable the first carrier to slide relative to the second carrier, and a dovetail track is provided between the first carrier and the carrier to enable the carrier to slide relative to the first carrier. The first magnet group, the second magnet group, and the coil are opposite to each other. When the coil is energized, a magnetic field is generated, and under the action of the magnetic field, the roller OIS voice coil motor realizes movements along the X-axis, Y-axis, and Z-axis. First support blocks are provided around the inner cavity of the second carrier. The first support blocks are paired in twos. The opposite faces of the two first support blocks in a group are inclined to form a first inclined surface. A roller groove is provided along the slope direction of the first inclined surface, and a circumferentially rotatable roller is embedded in the roller groove; first inclined grooves are correspondingly provided at the four corners of the bottom surface of the first carrier. The inclined surfaces of the first inclined grooves correspond to the first inclined surfaces of the first support blocks, so that the first carrier and the second carrier are in contact through the rollers; the two first inclined surfaces in a group are opposite to form a structure with a larger upper part and a smaller lower part, so that the two rollers in a group form the track cross-section for the sliding of the first carrier, and the four rollers in two groups form the track for the sliding of the first carrier. Second support blocks protrude from the four corners of the top surface of the first carrier. The second support blocks are paired in twos. The opposite faces of the two second support blocks in a group are inclined to form a second inclined surface. A roller groove is provided along the slope direction of the second inclined surface, and a circumferentially rotatable roller is embedded in the roller groove; second inclined grooves are correspondingly provided at the four corners of the bottom surface of the carrier. The inclined surfaces of the second inclined grooves correspond to the second inclined surfaces of the second support blocks, so that the carrier and the first carrier are in contact through the rollers; the two second inclined surfaces in a group are opposite to form a structure with a larger upper part and a smaller lower part, so that the two rollers in a group form the track cross-section for the sliding of the carrier, and the four rollers in two groups form the track for the sliding of the carrier. The first support block and the second carrier, and the second support block and the first carrier are integrally formed structures; the first inclined surface on the first support block and the second inclined surface of the second support block are perpendicular, so that the tracks formed by the rollers installed on the first inclined surface and the tracks formed by the rollers installed on the second inclined surface are perpendicular to each other, thereby realizing the translation of the roller OIS voice coil motor in two different directions along the X-axis and Y-axis.

2. The roller OIS voice coil motor according to claim 1, wherein: Multiple groups of rollers are embedded on two intersecting side surfaces of the second carrier. The multiple groups of rollers are horizontally arranged to guide the second carrier to slide in the up and down direction.

3. The roller OIS voice coil motor according to claim 1, wherein: The base is a hollow cuboid structure. Side walls protrude from the four sides of the base towards the second carrier. The middle parts of the four side walls are hollowed out to embed coils. The circuit board is arranged outside the four side walls and is electrically connected to the coils embedded in the side walls. The second carrier is embedded in the hollow structure surrounded by the four side walls. Among them, two second vertical walls protrude from the two intersecting sides of the second carrier towards the first support carrier. Embedding grooves for embedding the second magnet group are recessed in the two second vertical walls. The second magnet group includes two magnets which are respectively embedded in the embedding grooves and are opposite to the corresponding coils on the base to generate magnetic induction when powered on.

4. The roller OIS voice coil motor according to claim 3, wherein: Two sets of rollers are arranged on one of the second vertical walls. The two sets of rollers are respectively located on both sides of the embedding groove. Each set of rollers includes two horizontally arranged rollers which are separated. One set of rollers is arranged on the other second vertical wall. A sensor magnet groove is provided and a sensor magnet is installed through the sensor magnet groove. A sensor is correspondingly installed on the base. One set of rollers includes two horizontally arranged rollers which are separated. The three sets of rollers guide the translational movement of the roller OIS voice coil motor in the Z-axis direction.

5. The roller OIS voice coil motor according to claim 4, wherein: The carrier is a hollow cuboid structure. Grooves for embedding the first magnet group are recessed in two intersecting side surfaces of the carrier. The two grooves are opposite to the two embedding grooves. The first magnet group includes two magnets which are respectively embedded in the grooves.

6. The roller OIS voice coil motor according to claim 1, wherein: The roller OIS voice coil motor further includes a plate-shaped fixing buckle. Clamping plates extending towards the second carrier are provided at the four corners of the fixing buckle. Clamping protrusions are provided at the ends of the clamping plates. Clamping grooves are provided at corresponding positions on the second carrier. When the fixing buckle is buckled on the second carrier, the carrier and the first carrier are loaded in the surrounding structure of the fixing buckle and the second carrier.

7. The roller OIS voice coil motor according to claim 6, wherein: An outer shell is further provided on the fixing buckle. Among the four coils, patches are provided outside two of the coils to increase the magnetic field intensity of the two coils. The coils correspond to the magnets of the third magnet group.

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