A new VCM motor coil direct winding base structure

Abstract

The present application discloses a new VCM motor coil direct-winding base structure, including a base formed by injection molding, with four direct-winding columns corresponding to the four permanent magnets in the VCM motor arranged near the four corners of the base, and coils connected to each other are arranged on the four direct-winding columns, and the copper wires connecting two adjacent coils are in contact with contacts respectively preset on the base and located on both sides of the coils, and the copper wires between two adjacent coils are fixed by fixed edges fixed on the base. The problem of cumbersome assembly efficiency, high labor cost, low efficiency, and low reliability that have been plaguing the industry's VCM motors is solved.

Description

Technical Field

[0001] The present invention relates to the field of VCM motors, in particular to a VCM motor base, and specifically to a new VCM motor coil direct-wound base structure. Background Art

[0002] VCM motor is an important component for camera focus adjustment and anti-shake. Since its working principle is very similar to that of a speaker, it is also called voice coil motor in the industry. The main principle of voice coil motor is to control the stretching position of the spring sheet by changing the DC current of the coil in the motor in a permanent magnetic field, thereby driving the up and down movement. Mobile phone cameras widely use VCM to achieve autofocus function. Through VCM, the position of the lens can be adjusted to present a clear image.

[0003] Although the existing voice coil motors are based on different production designers, the product structure or naming may be different, but generally include the following components: the outer shell is used to fix, install and protect the external physical structure of the voice coil motor, usually made of metal. The bracket is used to realize the horizontal or radial movement of the lens to achieve anti-shake effect, usually connected to the base through a spring or precision spring. The front spring is used to carry the carrier and balance the torque. Some voice coil motors are also used for conduction, providing resilience for the circumferential movement of the lens to adjust the focus, and usually works in conjunction with the rear spring.

[0004] Permanent magnets generate permanent magnetic fields, which usually interact with coils to achieve a regulating effect. Coils generate driving torque when energized, which interacts with the magnetic field generated by permanent magnets. Carriers are used to install and carry lenses. Rear springs are used to carry carriers, and work with front yellow plates or front springs to generate balancing torques. Bases are used to fix components and provide circuits for powering the anti-shake coils and focus coils installed in the lens carriers.

[0005] At present, the industry can only fix the coil and other parts through glue dispensing and baking in a limited space. In order to ensure the power supply between the parts, the wire ends need to be placed in the corresponding area for welding. This operation process has the following defects:

[0006] 1. Before assembling the coil, glue dispensing is required at the assembly position. To prevent the coil from shifting, a fixture is needed to fix it before baking. The baking time is long, which increases the investment cost of equipment and fixtures, has low efficiency, and the fixing effect will also be affected by the machine and manual operation.

[0007] 2. When welding is performed after baking, the wire ends need to be placed manually at the corresponding welding positions before welding, resulting in inconsistent welding positions and increasing the difficulty of the operation. After welding, the wire ends need to be removed manually and machine operation cannot be achieved, which reduces the operation efficiency. The welding point position is offset, and poor welding will occur, resulting in material waste, which increases material and labor costs.

[0008] 3. The curing effect of the glue will also directly affect the reliability of the product; since the VCM motor is a precision instrument with a very small size, any error caused by improper installation or operation may affect the final VCM motor adjustment imaging effect. Therefore, providing a base that reduces installation difficulty, reduces the number of jobs, improves efficiency, and improves the reliability of coil installation is very important for the reliability and stability of the entire VCM motor. Summary of the invention

[0009] The present application provides a new VCM motor coil direct winding base structure, which is used to solve the problems of cumbersome assembly efficiency, high labor cost, low efficiency, low reliability, etc. that have been plaguing the industry's VCM motors. Existing VCM motors usually have four coils for optical image stabilization, and the installation positions are all set at the four corners or four sides of the base. The existing technology requires the coils to be installed one by one, but in order to ensure the accuracy of the installation and avoid the coils being deformed or skewed due to external forces during the installation process, which may cause unreliable subsequent VCM work, glue dispensing is often used to pre-fix the coils. Since glue dispensing cannot directly achieve the purpose of fixing, it is necessary to further heat and bake the coils, and the glue is solidified by baking to achieve the effect of fixing the coils. At the same time, other tooling is also needed to fix the coils consistently during the baking process to avoid deformation of the coils after molding and the inability to achieve precise installation. Four coils need to be installed four times. The existing technology requires welding the copper wire ends of two coils for each installation of one coil. Since the coils are very small, during the welding process, the copper wire ends of the coils need to be manually aligned with the contacts on the base for conducting electricity for the coils. This is very difficult for operators and requires very high technical operation skills. Any slight mistake will cause the welding to be skewed, affecting the conductivity, or even breaking the weld and scrapping. Moreover, this process has not been automated. Therefore, the existing base structure is difficult to operate, has low efficiency and low precision, and leads to high processing costs for finished products.

[0010] The base structure of the present application has good stability, low processing difficulty, high production efficiency, lower technical requirements for operators, more controllable accuracy, and can realize automated operation. It is significantly superior to the existing technology in terms of both technical implementation and technical effect.

[0011] In order to achieve the above purpose, the technical solution adopted in this application is:

[0012] A new VCM motor coil direct-winding base structure includes a base formed by injection molding, wherein four direct-winding columns corresponding to four permanent magnets in the VCM motor are arranged near the four corners of the base, and each of the four direct-winding columns is respectively provided with coils that are interconnected, and the copper wire connecting two adjacent coils contacts with contacts respectively preset on the base and located on both sides of the coil, and the copper wire between two adjacent coils is fixed by a fixed edge bar fixed on the base or fixed by glue.

[0013] In order to better fix the coils and to subsequently divide the interconnected multiple coils into multiple independent coils, preferably, the fixed ribs are arranged in parallel pairs and are located in the middle of two adjacent coils. The above structure is used to fix the two adjacent coils separately, which is also conducive to the subsequent coil division. The two free ends of the copper wire after division are fixed by the fixed ribs without any impact on the coils and are not affected by external forces. There is no fixed order between the division process and the welding process, which is more convenient to operate. The contact always corresponds to the position of the copper wire, which greatly reduces the difficulty of welding and improves the accuracy and one-time success rate of welding.

[0014] In order to further simplify the base structure and provide reliable conductive performance, a conductive layer is preset in the base through injection molding. The conductive layer includes multiple independent conductors. Any of the contacts is connected to a conductive PIN pin arranged on one side of the base through an independent wire. In the existing technology, the function of the base is mainly to fix it, and it does not have the function of conducting and supplying power by itself. The existing technology solves the problem of power supply to the coil by using a flexible printed circuit board (FPC). The flexible printed circuit board (FPC) will take up extra space and is not conducive to installation. At the same time, it will cause functional problems during the VCM motor mechanical shock test or during use. The present application adopts a design of replacing the existing flexible printed circuit board (FPC) with a conductive layer, which not only saves installation space, but also effectively ensures the stability and reliability of the circuit, which is conducive to the layout design of the base.

[0015] On the base, between any of the fixed ribs arranged in parallel pairs, a terminal for fixing the two free ends of the copper wire of the coil is arranged, and there is a gap between the terminal and the adjacent fixed ribs. Since the four coils are an integrated structure connected to each other before installation, the first and last coils each have a free copper wire end. In order to further facilitate automated winding installation and welding, a terminal is arranged on the base for winding the two free copper wire ends of the fixed coil, which can effectively ensure the relative fixity of the position of the coil and the base, and ensure that the copper wire between two adjacent coils contacts the contact points arranged on the base, which is conducive to orderly welding.

[0016] The base also includes an upper cover body that is buckled on the base for connecting the lower spring sheet, and a avoidance groove for accommodating the coil is provided on the upper cover body corresponding to the position of the coil. The function of the upper cover body is to better enable the connection relationship between the base and other components of the VCM motor, such as to supplement and compensate for the spatial connection relationship between the base and the lower spring sheet in the VCM motor, and to better adjust the spatial position relationship between the coil and the permanent magnet; as a further preferred solution, the upper cover body also adopts the same preset embedded conductive layer as the base to realize the layered power supply to each component of the VCM motor, replacing the existing flexible circuit board (FPC) power supply method. This makes the structural integrity of the base better, and can provide a better power supply solution while meeting the existing voice coil motor base fixing function.

[0017] Beneficial effects:

[0018] 1. This application uses four coils wound with the same copper wire to achieve one-time installation, eliminating the tediousness and uncontrollability of the existing separate installation of coils. One of the biggest technical effects and advantages of the existing split coil installation is that there is no need for glue pre-fixation, and there is no need for baking procedures. The structural stability of one-time injection molding is good, and the position of the copper wire and the contact point to be welded is relatively determined, which reduces the difficulty of welding.

[0019] 2. The mechanism of the present application also avoids the problem that the two ends of a single coil in the prior art are in a free state and difficult to align with the contacts; at the same time, it also avoids the problem of difficulty in welding caused by the mismatch between the ends of the copper wire and the contact positions.

[0020] 3. This application uses a built-in conductive layer to replace the existing flexible printed circuit (FPC) for power supply, which simplifies the structure, improves the stability and conductivity of the structure, and avoids the problems of complex process and low efficiency caused by the installation of a conductive flexible printed circuit (FPC). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative labor.

[0022] Figure 1 This is an exploded view of the overall structure of the voice coil motor involved in this application;

[0023] Figure 2 It is the structural exploded view of the base and the lower spring (including the assembly state of the upper cover);

[0024] Figure 3 It is an axonometric drawing of the three-dimensional structure of the base;

[0025] Figure 4 This is a top view of the coil installed on the base;

[0026] Figure 5 This is a top view of the base with terminal solutions;

[0027] Figure 6 is a schematic diagram of the conductive layer;

[0028] Figure 7 It is the axonometric drawing of the upper cover structure;

[0029] Figure 8 This is a schematic diagram of the structure before the coil is installed;

[0030] Fig. 9 yes Figure 8 Enlarged view of the winding joint at the free end of the copper wire.

[0031] In the figure: 1-outer shell; 2-upper spring sheet; 3-lens carrier; 4-support; 5-permanent magnet; 6-lower spring sheet; 7-base; 71-coil; 72-contact; 73-cutting groove; 74-fixed edge bar; 75-straight winding column; 76-connecting post; 77-conductive PIN foot; 78-conductive layer; 8-upper cover; 81-avoidance groove. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0033] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0034] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0035] In the description of this application, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, if the terms "first", "second", etc. appear in the description of this application, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] In addition, if the terms "horizontal" or "vertical" appear in the description of this application, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0037] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In order to better clarify the difference between the present application and the base in the prior art and the different technical effects it brings, the role of the present application in the voice coil motor and the coordination between the related structures of the voice coil motor and the working principle are briefly discussed.

[0039] Results Instructions Attached Figure 1-4 As shown in the figure, the VCM motor includes an outer shell 1, an upper spring piece 2, a lens carrier 3, a support 4, a permanent magnet 5, a lower spring piece 6 and a base 7 from top to bottom. Among them, the base 7 and the outer shell 1 are interlocked to play a fixing role. The lens carrier 3 is a mechanism for installing the lens. The lens carrier 3 is installed in the support 4 through the upper spring piece 2 and the lower spring piece 6. Since the lens carrier 3 is also provided with an electromagnetic coil for adjusting the focal length, the electromagnetic coil is energized and the magnetic field generated by the energized coil interacts with the magnetic field of the permanent magnet 5 to achieve focusing. The upper spring piece 2 and the lower spring piece 6 are both designed with inner and outer circles to meet the needs of focusing and anti-shake movement of the lens carrier 3. The permanent magnet 5 has four, such as Figure 1As shown, they are respectively embedded in the four corners of the support 4, and the inner and outer free ends of the lower spring piece 6 are respectively connected to the lens carrier 3 and the base 7, and the middle part of the lower spring piece 6 is also connected to the support 4, so that the base 7, the support 4 and the lens carrier 3 are elastically suspended and connected in pairs, and the relative movement between the base 7, the support 4 and the lens carrier 3 can be achieved through the action of the magnetic field. The lower part of the base 7 corresponding to the four permanent magnets 5 is provided with four independently energized coils 71, as shown in FIG. Figure 4 As shown, one or more coils 71 are energized to interact with the magnetic field of the permanent magnet 5 itself to generate a force on the support 4, thereby achieving the adjustment of the lens X / Y axis anti-shake, wherein the X axis is the plane where the base 7 is located, and the Y axis is the anti-shake perpendicular to the plane where the base 7 is located. The specific adjustment range and direction depend on the magnitude of the magnetic field force generated by the coil 71, and the control of the magnetic field strength is achieved by controlling the current strength of the coil 71. Different designs have different current calibrations. The above content is only a brief explanation of the working principle of the voice coil motor in order to better understand the present application. Although the present application has not made substantial improvements to the above adjustment technology, understanding the working principle of the above voice coil motor is of great help in understanding the technical innovations of the present application and the beneficial technical effects achieved.

[0040] Embodiment 1:

[0041] A new VCM motor coil direct-winding base structure includes a base 7 formed by injection molding, wherein four direct-winding columns 75 corresponding to four permanent magnets 5 in the VCM motor are arranged near the four corners of the base 7, and each of the four direct-winding columns 75 is respectively provided with a coil 71 that is interconnected, and the copper wire connecting two adjacent coils 71 contacts with contacts 72 that are respectively preset on the base 7 and located on both sides of the coil 71, and the copper wire between two adjacent coils 71 is fixed by a fixed rib 74 fixed on the base 7.

[0042] The working principle of this embodiment is not substantially different from that of the existing VCM motor. Only the installation method of the base and the coil has been changed, thereby achieving a change in the technical effect through the change in structure. This embodiment uses a straight winding column 75 to position and install the coil 71, and the coil 71 is wound and fixed on the straight winding column 75 by injection molding. The key point is that during installation, the four coils 71 are interconnected, that is, they are wound with the same copper wire, and the installation of the four coils 71 can be completed at one time, eliminating the cumbersomeness and uncontrollability of the existing separate installation of coils. One of the greatest technical effects and advantages of the integrated coil 71 over the existing split coil installation is reflected in the installation process and welding process. After the installation of the split single coil, it is necessary to fix the coil, usually by dispensing glue; and after dispensing glue, in order to achieve a good fixing effect, it is necessary to use customized tooling to constrain it, and then bake and cure the glue to achieve the effect of fixing the coil. After the coil is fixed, the two free copper wire ends of the single coil are welded to the designated energized contacts. Since the free copper wire ends of the single coil are in a free state, they are usually not aligned with the contacts, which makes the welding process difficult. In this embodiment, the integrated coil 71 is installed on the straight winding column 75 at one time, and the copper wire is wound and fixed on the straight winding column 75 at one time through the winding process, without the need for pre-fixing by dispensing glue, and no baking process is required.

[0043] Furthermore, since the copper wire connecting the two adjacent coils 71 in this embodiment is arranged corresponding to the straight winding column 75, the corresponding relationship between the copper wire and the contact 72 is very easy to control. After injection molding or the copper wire is wound on the straight winding column 75, the contact and the copper wire can be spot welded together at the position of the contact 72. Since the coils 71 are integrated with each other and have fixed ribs 74 to constrain the copper wire connecting the two adjacent coils 71, the problem of the two ends of the single coil 71 in the center of the prior art being in a free state and difficult to align with the contact 72 is avoided; at the same time, the problem of difficulty in welding caused by the mismatch between the ends of the copper wire and the contact 72 is also avoided. When welding is completed, it is only necessary to cut the copper wire between two adjacent contacts 72 between two adjacent coils 71, and the interconnected coils 71 will become four independent coils 71. This greatly simplifies the installation process and greatly improves the stability of the base structure. At the same time, the installation accuracy of the coil 71 is also easier to ensure. The technical problem that the welding end of the coil 71 is free and difficult to align with the contact 72 for welding is solved, and the difficulty of welding is significantly reduced.

[0044] As another implementation scheme of this embodiment, the fixed rib 74 can be fixed by glue spotting and solidification, replacing the injection molding method of the fixed rib 74; but it is worth explaining and emphasizing here that the glue spotting fixation here is essentially different from the glue spotting fixation coil 71 in the prior art, because the existing coil 71 is independent, and its copper wire end is in a free state, and precise positioning glue spotting is required, otherwise, the subsequent welding process will not be able to proceed, but this embodiment only uses glue spotting to fix the copper wire with a relatively determined original position on the base, so as to facilitate the subsequent division of the coil 71 connected to each other as a whole into four independent coils, without the alignment requirements of the existing glue spotting technology, and the structure of the interconnected integral coil 71 is a substantial change compared with the existing independent coil installation. This structural change not only contributes to the stability and reliability of product installation, but also inevitably simplifies the installation process and process due to the change in structure, thereby improving efficiency.

[0045] Embodiment 2:

[0046] On the basis of Example 1, further combined with the attached Figure 4 In the structure shown, the fixed ribs 74 are arranged in parallel pairs and are located in the middle of two adjacent coils 71. The above structure is used to fix the two adjacent coils separately, which is also convenient for subsequent coil segmentation. The two free ends of the copper wire after segmentation are fixed by the fixed ribs 74 without any influence on the coils and are not affected by external forces. There is no fixed sequence between the segmentation process and the welding process, which is more convenient to operate. The contact 72 always corresponds to the position of the copper wire, which greatly reduces the difficulty of welding and improves the accuracy and one-time success rate of welding.

[0047] Embodiment 3:

[0048] On the basis of the structure of Example 1 or 2, in order to solve the problem of fixing two free copper wire ends of the integrated coil 71 during installation, the integrated coil 71 is installed relative to the base 7, and the position of the copper wire between any two adjacent coils 71 is determined, so that during subsequent welding, the position of the copper wire and the contact 72 is determined, reducing the difficulty of welding, such as Figure 5As shown: a terminal 76 for fixing the two free ends of the copper wire of the coil 71 is arranged between any of the fixed ribs 74 arranged in parallel, and there is a gap between the terminal 76 and the adjacent fixed ribs 74. Since the four coils 71 are an integrated structure connected to each other before installation, the first and last coils 71 respectively have a free copper wire end. In order to further facilitate installation and welding, a terminal 76 is arranged on the base 7 for winding the two free copper wire ends of the fixed coil 71, which can effectively ensure the relative fixity of the position of the coil 71 and the base 7, and ensure that the copper wire between two adjacent coils 71 contacts the contact 72 arranged on the base 7, which is conducive to orderly welding. When welding is completed, the copper wire can be cut along the cutting groove 73 formed between the fixed ribs 74 arranged in pairs in rows to form four independent coils from the integrated interconnected coils 71. Since both ends of the cutting groove 73 are fixed ribs 74 for fixing the copper wire, no matter how it is cut, it will not affect the working condition of the coil 71. This operation step does not require any technical content and is substantially less difficult than welding a single coil 71 in the prior art.

[0049] As another implementation of this embodiment, the coil 71 may be arranged as follows before installation. Figure 8 When installing the structure shown in the figure, it is only necessary to install the coil 71 on the base 7. The terminal 76 can be better positioned. Fig. 9 The copper wire ends of coil 71 are shown.

[0050] Embodiment 4:

[0051] In order to further simplify the base structure and provide reliable conductive performance, Figure 6 and 7 Content shown: The base 7 is pre-set with a conductive layer 78 by injection molding, and the conductive layer 78 includes multiple independent conductors. Any of the contacts 72 is connected to a conductive PIN foot 77 provided on one side of the base 7 through an independent wire. In the existing technology, the function of the base 7 is mainly to fix it, and it does not have the function of conducting power by itself. The existing technology solves the problem of power supply to the coil by using a flexible printed circuit board (FPC). The flexible printed circuit board (FPC) will take up extra space and is not conducive to installation. At the same time, it will cause the stability of the wiring during the VCM motor focusing and anti-shake process. The present application adopts a conductive layer 78 to replace the existing flexible printed circuit board (FPC) design, which not only saves installation space, but also effectively ensures the stability and reliability of the circuit, which is conducive to the layout design of the base 7.

[0052] As a preferred method of any embodiment of the present application, a Hall sensor for sensing the offset of the support 4 is also provided in two adjacent or opposite straight winding columns 75 to further feedback the working state of the VCM motor, so as to further adjust the working current of the coil 71 to achieve displacement compensation, so as to achieve a better anti-shake effect; the working principle of the Hall sensor is a mature existing technology and will not be repeated in this embodiment.

[0053] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A new VCM motor coil direct-wound base structure, comprising a base (7) formed by injection molding, characterized in that: Four straight-wound columns (75) corresponding to the four permanent magnets (5) in the VCM motor are arranged near the four corners of the base (7), and each of the four straight-wound columns (75) is provided with a coil (71) that is interconnected. The copper wire connecting two adjacent coils (71) contacts with contacts (72) that are respectively preset on the base (7) and located on both sides of the coil (71). The copper wire between the two adjacent coils (71) is fixed by a fixed rib (74) fixed on the base (7). The four coils are wound with the same copper wire. After the copper wire is wound on the straight-wound columns, the contact and the copper wire are spot-welded together at the contact position. After the welding is completed, the copper wire between two adjacent contacts between the two adjacent coils is cut off, and the interconnected coils become four independent coils.

2. According to claim 1, a new VCM motor coil direct winding base structure is characterized by: The fixed ribs (74) are arranged in parallel in pairs and are located in the middle of two adjacent coils (71).

3. According to claim 2, a new VCM motor coil direct winding base structure is characterized by: A conductive layer (78) is preset in the base (7) by injection molding, and the conductive layer (78) includes a plurality of independent wires, and any of the contacts (72) is connected to a corresponding conductive PIN foot (77) arranged on one side of the base (7) via an independent wire.

4. A new VCM motor coil direct-wound base structure according to claim 2 or 3, characterized in that: On the base (7), between any of the fixed ribs (74) arranged in parallel in pairs, a terminal (76) for fixing the two free ends of the copper wires of the coil (71) is provided, and a gap exists between the terminal (76) and the adjacent fixed ribs (74).

5. According to claim 4, a new VCM motor coil direct-wound base structure is characterized in that: The base (7) further comprises an upper cover body (8) which is buckled on the base (7) and is used to connect the lower elastic sheet (6); a avoidance groove (81) for accommodating the coil (71) is provided on the upper cover body (8) at a position corresponding to the coil (71).

Images