A corner reinforcement spring for a VCM motor

Abstract

The present invention belongs to the technical field of voice coil motors, and discloses a corner reinforcement spring for a VCM motor, which is arranged in the motor to provide a motion reset force. The spring is a sheet of uniform thickness, and has at least one corner bent along the width direction of the spring, and has a corner reinforcement portion at the corner, and the average corner thickness of the corner reinforcement portion is not greater than twice the thickness of the spring. The present invention strengthens the strength of the spring bend by reinforcing the bend of the bent spring to prevent breakage, or fixes the bend of the bent spring by adding a fitting reinforcement portion to prevent breakage; and under strict parameter limitations, the K value of the reinforced spring in different directions varies little, meeting the functional requirements of the spring.

Description

Technical Field

[0001] The invention belongs to the technical field of voice coil motors, and in particular relates to a corner reinforcing spring for a VCM motor. Background Art

[0002] The VCM motor is a device that converts electrical energy into mechanical energy and achieves linear and limited swing angle motion. It is a device that uses the interaction between the magnetic field from the permanent magnet and the magnetic poles in the magnetic field generated by the energized coil conductor to produce regular motion. Because the voice coil motor is a non-commutated power device, its positioning accuracy depends entirely on the feedback and control system and has nothing to do with the voice coil motor itself. The emergence of the VCM motor has transformed the smartphone camera from fixed focus to autofocus, while giving small or micro cameras an anti-shake function. Its biggest function is that the camera can automatically focus and provide motion compensation.

[0003] The VCM of the mobile phone camera needs the cooperation of the Driver IC to complete the focus and anti-shake. The existing VCM controls the size of the VCM power supply current through the Driver IC to determine the distance the lens carried by the VCM moves, so as to adjust it to the appropriate position to capture a clear image. The VCM motor actually moves based on the principle that the energized coil is subjected to force in the magnetic field. Precise control requires the help of some external components, including the use of shrapnel to elastically limit and support the sensor or lens module to provide a support fixation effect and elastic motion state.

[0004] However, with the increase in pixels, the requirements for the internal components of the VCM motor are becoming higher and higher, especially for the spring-type large-pixel VCM motor, the thickness of the spring has become higher and higher, from the ordinary 0.035-0.04-0.05mm thickness to the current 0.07-0.08-0.09mm thickness, or even thicker springs. Large-pixel motors need to be equipped with thicker springs. For designers, they can design and match the relative spring K value and spring stress to meet the reasonable design requirements of the motor.

[0005] Existing motor shrapnel often carries out structural design and material selection according to the module kinetic energy it carries. In order to achieve a larger tensile stroke on a thinner structure, multiple corners are set to form a spiral strip structure in a limited space. This shrapnel structure will form stress concentration at the bend, and after a long time, the material fatigue will produce cracks, resulting in tearing and damage. At the same time, the bending process will destroy the structure of the alloy material commonly used for shrapnel such as BF158 and C1990GSH, and cracks or breaks will appear after bending. Summary of the invention

[0006] In order to solve the problems existing in the prior art, the present invention provides a corner reinforcement spring for a VCM motor. By setting a certain amount of corner reinforcement part at the corner of the spring, the structural strength of the spring can be enhanced and the service life can be improved. At the same time, the spring coefficient K value is less affected after reinforcement, thereby avoiding the failure to meet the design requirements due to changes in the characteristics of the spring.

[0007] The technical solution adopted by the present invention is:

[0008] In a first aspect, the present invention provides a corner reinforcement spring for a VCM motor, which is arranged in the motor to provide a motion reset force. The spring is a sheet of uniform thickness and has at least one corner bent along the width direction of the spring, and a corner reinforcement portion is provided at the corner. The average corner thickness of the corner reinforcement portion is not more than twice the thickness of the spring.

[0009] It is worth noting that the existing spring pieces are mainly planar structures, and are generally of uniform thickness, and are formed by cutting on the same sheet material. The width dimension of such spring pieces is much larger than the thickness dimension, and when in use, they are mainly bent and deformed on the plane with a larger surface area to achieve elastic limitation.

[0010] The homogeneous thickness sheet mentioned above is a common application method of spring pieces in this field, but it can be foreseen that even if the spring piece itself has a local thickening treatment in the thickness direction, it should be considered to be within the scope of protection of the present invention. Its essence is mainly to limit the dimensional limitation relationship in the present invention.

[0011] At the same time, the corner reinforcement part in the present invention also belongs to the reinforcement in the thickness direction of the spring piece, but it is limited to being set at the corner. The so-called corner refers to the part of the spring piece that has an obvious bend along its width direction. Since the ordinary spring piece can be regarded as a plane structure in the initial state, this corner is different from the bending corner of the ordinary spring piece in the same plane. The bending corner form in the same plane has better structural strength in this direction because its force is mainly borne by the material in the width direction of the spring piece, and it is not easy to produce cracks.

[0012] The corner in the present invention refers to a bending method that will produce a fold line on the surface where the width is located. At this time, the force is borne by the material in the thickness direction. Since the thickness is much smaller than the width dimension, it is easy to cause breakage when subjected to force in this direction.

[0013] It is also worth noting that the corner reinforcement part is a structure that fits on the surface where the spring sheet width is located, but the spring sheet has two width surfaces, so the so-called average thickness refers to the overall increased thickness of the position where the corner reinforcement part is set, and the corner reinforcement part includes two types of single-sided setting and double-sided setting. However, since the corner reinforcement part can be regarded as forming an integral structure with the spring sheet after being fixed, it only needs to ensure the overall thickness at the corner, so the single-sided setting on the inner concave surface uses less material, and at the same time can meet the reinforcement requirements, which is a common method.

[0014] In combination with the first aspect, the present invention provides a first implementation manner of the first aspect, wherein the average corner thickness of the corner reinforcement portion is not less than the thickness of the spring sheet.

[0015] It is worth noting that the thickness of the corner reinforcement portion changes in a gradual increase manner, and after a smooth transition, a portion of equal thickness is formed, and the thickness of this portion has a range value, that is, at least greater than or equal to the thickness of the spring sheet, and less than or equal to twice the thickness of the spring sheet. In other words, the thickness of the spring sheet portion with the corner reinforcement portion is 2-3 times the thickness of the original spring sheet.

[0016] When setting the corner reinforcement part, it will be ensured that the entire bending part is covered with material with an average thickness of 1-2 times the thickness of the spring sheet to avoid additional stress concentration points caused by uneven local coverage.

[0017] In combination with the first aspect or the first embodiment of the first aspect, the present invention provides a second embodiment of the first aspect, wherein the corner of the spring sheet is one or more of a single crease corner, a multi-section corner with multiple creases, and a curved surface corner.

[0018] It is worth explaining that the so-called single crease means that there is only one crease at the corner (a single crease in the macroscopic sense). At this time, regardless of the angle, the crease is the stress concentration position, and the thickness here can be greater than 2 times the thickness of the spring. And the reinforced corner reinforcement part avoids complete stress concentration by at least two creases or smooth bending transition. Multiple creases are a way to achieve the target angle by multiple bends, and the reinforcement is also achieved by single-sided or double-sided coverage. Compared with a single crease, the structural strength of multiple creases itself is better. The best strength method is a smooth curved surface transition, which is the above-mentioned arc surface corner. At this time, the corner reinforcement part also adopts the arc surface transition method. At the same time, the contact position with the straight springs on both sides is also set in a gradual diameter method to avoid the generation of additional stress concentration parts, which affects the connection stability between the corner reinforcement part and the spring.

[0019] In combination with the first aspect or the first embodiment of the first aspect, the present invention provides a third embodiment of the first aspect, wherein the corner of the spring sheet is connected by a corner body having an angle between the width direction and the width direction of the spring sheet that is not zero, and the corner body is bent and connected to the spring sheet.

[0020] It is worth noting that the structure of the present invention is mainly for the spring structure vertically arranged in the VCM motor, which mainly provides elastic limit and support in the XY direction, that is, anti-shake limit in the plane direction perpendicular to the axis of the camera. In order to minimize the strength drop at the corner, another cornering method is also adopted, that is, using its larger width size to connect the spring parts on both sides of the corner through a parallel and triangular corner body.

[0021] In combination with the first aspect or the first embodiment of the first aspect, the present invention provides a fourth embodiment of the first aspect, wherein the corner reinforcement portion is a portion integrally formed with the spring sheet.

[0022] In combination with the first aspect or the first embodiment of the first aspect, the present invention provides a fifth embodiment of the first aspect, wherein the corner reinforcement portion is a thickened structure formed by fixing an amorphous material at the corner of the spring piece after the spring piece is formed through a process.

[0023] In combination with the fifth implementation of the first aspect, the present invention provides a sixth implementation of the first aspect, wherein the process includes soldering and glue curing.

[0024] In combination with the first aspect or the first embodiment of the first aspect, the present invention provides a seventh embodiment of the first aspect, wherein the corner reinforcement portion is a thickened structure formed by fixing an independent fitting reinforcement block at the corner of the spring piece after the spring piece is formed through a process.

[0025] In combination with the third embodiment of the first aspect, the present invention provides an eighth embodiment of the first aspect, wherein the corner reinforcement portion is a thickened structure formed by fixing an independent fitting reinforcement block on the corner body after the spring sheet is formed through a process, and the fitting reinforcement block is in fitting contact with the spring sheet at the same time.

[0026] In combination with the first aspect or the first embodiment of the first aspect, the present invention provides a ninth embodiment of the first aspect, wherein the thickness of the spring sheet is 0.03-0.1 mm.

[0027] The beneficial effects of the present invention are:

[0028] (1) The present invention adds various types of corner reinforcement structures at the corners of the spring sheet, thereby forming a reinforcement structure that is integrated or fixedly connected with the spring sheet. The thickness requirement of the reinforcement structure can significantly reduce the stress at the corners. At the same time, after reliability experiments, it is found that the fracture improvement effect is obvious;

[0029] (2) The present invention has strict size restrictions, thereby improving the structural strength while retaining the elastic characteristics of the spring. The change rate of its K value is tested to be less than 1%, thereby avoiding changes in its elastic characteristics due to structural changes, which is not conducive to subsequent spring adjustment;

[0030] (3) The present invention is applicable to bending methods with different corners by providing an amorphous reinforcement structure and a separate complete reinforcement structure, thereby satisfying the reinforcement of various spring bending angles. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram showing a double thickness enhancement comparison of a bent spring using a right-angle turn in Example 1 of the present invention;

[0032] Figure 2 It is a schematic diagram for comparing the double thickness reinforcement of the bending spring using a right-angle turn in Example 1 of the present invention;

[0033] Figure 3 This is a schematic diagram showing a double thickness enhancement comparison of a bending spring using an arc-shaped corner in Example 2 of the present invention;

[0034] Figure 4 This is a schematic diagram for comparing the double thickness reinforcement of the bending spring using the arc-shaped corner method in Example 2 of the present invention;

[0035] Figure 5 This is a schematic diagram showing a double thickness reinforcement comparison of a bent spring using a double bending angle method in Example 3 of the present invention;

[0036] Figure 6 is an overall view of a spring blank using a bending portion with multiple bending angles as a corner structure in Example 4 of the present invention;

[0037] Figure 7 The present invention Figure 6 Schematic diagram of the reinforcement comparison at the corner of a single shrapnel;

[0038] Figure 8 It is a schematic diagram of structural statics finite element analysis in ANSYS Workbench simulation software in Example 1 of the present invention;

[0039] Fig. 9 It is a schematic diagram of another reinforcement method in Example 4 of the present invention.

[0040] In the figure: 1-corner reinforcement part, 2-fitting reinforcement part. DETAILED DESCRIPTION

[0041] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] Embodiment 1:

[0049] This embodiment discloses a VCM motor corner reinforcement spring, which is used in a voice coil motor used as an AF autofocus module or an OIS optical image stabilization module in a miniature camera. Since this type of motor is small in size, the movement of the control component is generally constrained by electromagnetic force. In order to better constrain, this metal sheet spring is used.

[0050] When the spring piece is assembled in the lens, the axis direction of the lens is taken as the Z axis, and the plane where the lens sensor is located establishes an XY axis coordinate system to illustrate the relative position relationship.

[0051] The shrapnel in this embodiment mainly involves two types of shrapnel models, C1990-GSH and BF158-TM10, wherein C1990-GSH is a high-performance titanium-copper material with medium-to-high-grade strength of copper alloys. The thickness of the shrapnel is generally between 0.03-0.1 mm, and the commonly used thickness is 0.03-0.06 mm.

[0052] The spring itself is a structure made by etching on a whole metal plate, and is generally a planar structure. Although it has multiple coplanar bending points, it is cut from the same metal plate without any bending treatment, so it has no internal stress.

[0053] The planar structure of the spring piece is mainly used as the elastic limit and support of the lens module on the Z axis in AF autofocus. It is divided into a fixed end and a hanging wire part according to the structural characteristics. The fixed end is fixed to the corresponding part of the motor by dispensing or soldering, and the hanging wire itself is a straight structure with bending parts between adjacent hanging wires.

[0054] The spring piece involved in this embodiment not only has a planar part, but also forms a vertical part on the same spring piece, that is, the suspension wire on part of its plane is bent so that the width surface can face the X and Y directions, thereby providing elastic limiting and supporting effects in the X and Y axis directions for the structure it carries.

[0055] However, since the spring sheet is formed by etching on the metal plate, even if a vertical suspension wire portion is reserved, it needs to be bent after cutting and forming. In order to provide elastic limit and support effects in both the X and Y axis directions, the bent suspension wire has at least one corner portion, thereby forming mutually perpendicular suspension wire portions.

[0056] Because there is a corner part formed by the bending process, there is internal stress at the corner. Figure 1 and Figure 2As shown, the corner portion in this embodiment is processed in the manner of a right-angle corner with a single fold. This corner has internal stress, and stress concentration will naturally occur when elastic deformation occurs, which will cause abnormal fracture after a certain period of time due to its poor structural strength.

[0057] As shown in the figure, in this embodiment, the thickness of the spring sheet is doubled and the thickness of the spring sheet is doubled by the dispensing or soldering process. The reinforced spring sheet forms a part with an average thickness of twice or three times the thickness at its corner, increasing its structural strength. In addition, multiple creases or smooth transitions are formed at the thickened corners, and the single crease at a macroscopic angle of 90° is modified into multiple creases or smooth transitions at a small angle, thereby reducing the risk of fracture. It is worth noting that the so-called crease refers to the part with a large arc angle change formed at the bend when viewed from a macroscopic angle. Since it is only a broken line in the human eye's field of vision, it is referred to as a crease, but after local magnification, it is the smooth and natural bend of the material itself.

[0058] Unlike other application areas, since the metal shrapnel mainly provides anti-shake limit and support in the XY axis direction for the lens or sensor components in the lens module, it is necessary to ensure that its elastic performance is balanced within a certain range. If it is directly thickened by conventional technical means, the structural strength will continue to increase with the increase in thickness. However, the elastic coefficient K value of the shrapnel in each direction will change. Once the change is large, it will affect the limit and support effect of the entire shrapnel. For such a mechanism that requires precise positioning and resetting, once the K value changes, the internal electromagnetic structure also needs to be adjusted. If the elastic deformation resistance increases, it may exceed the maximum electromagnetic force that the electromagnetic coil can provide, resulting in the lens or sensor being unable to be pushed to the corresponding position, resulting in an inability to focus or abnormal picture jitter. The above situation cannot be adjusted in the later stage, and even the entire shrapnel may be scrapped and unusable.

[0059] The thickness range limited by the thickening treatment in this embodiment is very important. For the finished product of the same spring sheet material under this thickness, the elastic coefficient K value in each direction corresponding to the same thickness can be changed less under the premise of increasing the thickness by up to two times to improve the structural strength. If the thickness is greater than this, not only will the structural strength not be significantly improved, but the resulting change in K value will require adjustments to other components, which is costly.

[0060] In order to verify the influence of the aforementioned thickening dimensions on the K value and the structural strength, this embodiment simulates multiple groups of spring pieces with different thicknesses to feedback the actual situation, as shown below.

[0061] For the spring material with a thickness of 0.03 mm, the structural statics finite element analysis of the ANSYS Workbench simulation software is performed, mainly using the equivalent stress tool to evaluate the strength of the ductile metal material.

[0062] 1. Data processed by a spring with a thickness of 0.03 mm

[0063]

[0064] The above table shows that after the spring with a thickness of 0.03mm is thickened by one and two thicknesses, it can be seen that the K value and stress of the whole spring do not change much during the different displacement tests, but it can be seen that under the spring with a thickness of 0.03mm, the stress change in the x direction due to the thickening of two times the thickness is close to the maximum acceptable change. If the thickness continues to increase, the change in the K value can no longer meet the normal spring adjustment and functional requirements.

[0065] 2. Data processed by a spring with a thickness of 0.04 mm

[0066]

[0067] The above table is a simulation test for a spring with a thickness of 0.04mm. Compared with 0.03mm, the stress change and K value change at this thickness also meet the requirements.

[0068] 3. Data processed by a spring with a thickness of 0.05 mm

[0069]

[0070]

[0071] The above table has the same conclusion as 0.04mm.

[0072] 4. Data processed with a spring with a thickness of 0.06 mm

[0073]

[0074] The above table shows the spring sheet thickness of 0.06mm. It can be seen that for the spring sheet of this thickness, the stress at the bending point decreases, and the change in K value is the smallest. It can be considered that after the thickness of the spring sheet itself increases, the increase in the thickness of the spring sheet has little effect on the change in K value.

[0075] exist Figure 8 The simulation software shows the rotation test diagram of the 0.06mm spring after thickening the spring by two thicknesses. Since the image itself cannot show the stress distribution after decolorization, it is only used as a numerical and simulation process illustration.

[0076] At the same time, reliability tests were conducted on the corners and thickened corners of the spring, and the experimental data are as follows:

[0077]

[0078] It can be seen that after data simulation, it is found that the springs of different thicknesses have a 100% defective ratio after the spring bending test without reinforcement, and all of them have fractures, and the experimental results are all Fail, and the test curve in the RA test is seriously disordered. However, the defective ratio of corners after reinforcement is 0, and there is no fracture phenomenon. The curve in the test is smooth, and the result is best when at least one spring thickness is reinforced.

[0079] In summary, through simulation tests, it can be considered that for a spring sheet of this thickness (which is also the commonly used spring sheet thickness in the art), the optimal thickness range for thickening treatment at the simplest right-angle corner is within the range of one to two times the thickness.

[0080] Embodiment 2:

[0081] This embodiment is the same as the first embodiment, and also discloses a corner reinforcing spring of a VCM motor, such as Figure 3 and Figure 4 As shown in the figure, it can be seen that the corner of the spring piece is an arc-shaped corner, and the reinforced corner surface is also an arc-shaped surface.

[0082] Similar to Example 1, the corner reinforcement portion 1 in this embodiment is also reinforced only on the inner side by soldering or dispensing technology, and the reinforced portion is shown separately by solid lines in the figure, while the corner portion after actual processing is an integrated structure.

[0083] Due to the arc surface transition, the stress is evenly distributed and there is no macroscopic stress concentration point. The spring piece is tested after being strengthened, and the results are the same as those in Example 1. On the premise of having better structural strength at the corner of the spring piece with one to two thicknesses, the change of the K value can be kept within an acceptable range.

[0084] Embodiment 3:

[0085] This embodiment is the same as the first embodiment, and also discloses a corner reinforcing spring of a VCM motor, such as Figure 5 As shown in the figure, it can be seen that the corner of the spring piece is a multiple bending treatment method with multiple fold lines, which is also the most common bending treatment method in the process. Compared with a single fold line, this corner treatment has better structural strength, and the reinforced corner surface is also a multi-fold fold surface.

[0086] Similar to Example 1, the corner reinforcement portion 1 in this embodiment is also reinforced only on the inner side by soldering or dispensing technology, and the reinforced portion is shown separately by solid lines in the figure, while the corner portion after actual processing is an integrated structure.

[0087] The test results after the reinforcement of the spring piece are the same as those of Example 1. On the premise of having good structural strength at the corner of the spring piece with one to two thicknesses, the change of the K value can be kept within an acceptable range.

[0088] Embodiment 4:

[0089] This embodiment is the same as the first embodiment, and also discloses a VCM motor corner reinforcement spring, such as Figure 6 As shown in the figure, it can be seen that the spring has supporting wires in the X, Y and Z axis directions at the same time, and the corner processing is mainly aimed at the corner connection with the vertically arranged spring sheet wires in the X and Y axis directions.

[0090] Different from the above embodiment, Fig. 9 The corner processing method of the vertical hanging wire part of this spring piece is shown in the figure. The corner part in this embodiment is transitioned by a corner body. The corner body itself belongs to the integrally formed part of the spring piece. When cut, it forms a triangular structure, which is connected to the hanging wires perpendicular to each other on both sides through two equal-width parts. When the spring pieces on both sides need to be folded, two 45° and symmetrical bends will be formed in this part. The corner structure connected by this corner body is easier to handle in terms of process.

[0091] For this corner structure, the two bends of the corner body are strengthened by glue or soldering. The strength change and K value change after treatment are the same as those in Example 1. The best thickening condition is one to two spring sheet thicknesses, and the K value change is small.

[0092] Further, such as Figure 7 As shown, in order to strengthen the corner structure, this embodiment also separately provides a plastic block, whose thickness is equal to twice the thickness of the spring sheet, and has an end face that fits the surface of the spring sheet. It is fixed at the corner by gluing, thereby forming a fitting reinforcement part 2 that fits and contacts with the spring sheets on both sides and the bottom corner body at the same time.

[0093] The fitting reinforcement part 2 can also bring better corner structure reinforcement to the entire spring piece. The defective rate of the spring piece after reinforcement is 0 through reliability test. At the same time, since it adopts a softer plastic material and is lighter in weight, its elasticity is lower than that of the spring piece itself. Therefore, although the volume is larger, the K value of the spring piece after thickening treatment does not change significantly, which meets the requirements of the spring piece.

[0094] The present invention is not limited to the above optional implementations, and anyone can derive other various forms of products under the enlightenment of the present invention. The above specific implementations should not be understood as limiting the scope of protection of the present invention. The scope of protection of the present invention should be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. A spring-piece corner reinforcement structure for a VCM motor, wherein the spring piece is a sheet of uniform thickness and has at least one corner bent along the width direction of the spring piece, characterized in that: It comprises a corner reinforcement part (1) arranged at the corner, the average corner thickness of the corner reinforcement part (1) is not greater than twice the thickness of the spring piece; the average corner thickness of the corner reinforcement part (1) is not less than the thickness of the spring piece; the spring piece is made of C1990-GSH or BF158-TM10 material.

2. The spring-clip corner reinforcement structure of a VCM motor according to claim 1, characterized in that: The corner of the spring piece is one or more of a single fold corner, a multi-segment corner with multiple folds, and a curved surface corner.

3. The corner reinforcing spring of a VCM motor according to claim 1, characterized in that: The corner of the spring sheet is connected by a corner body whose width direction has an angle not equal to 0 with the width direction of the spring sheet, and the corner body is bent and connected to the spring sheet.

4. The corner reinforcing spring of a VCM motor according to claim 1, characterized in that: The corner reinforcement portion (1) is a portion formed integrally with the spring sheet.

5. The corner reinforcing spring of a VCM motor according to claim 1, characterized in that: The corner reinforcement portion (1) is a thickened structure formed by fixing an amorphous material at the corner of the spring piece after the spring piece is formed.

6. The corner reinforcing spring of a VCM motor according to claim 5, characterized in that: The process includes soldering and adhesive curing.

7. The corner reinforcing spring of a VCM motor according to claim 1, characterized in that: The corner reinforcement portion (1) is a thickened structure formed by fixing an independent fitting reinforcement block (2) at the corner of the spring piece after the spring piece is formed.

8. The corner reinforcing spring of a VCM motor according to claim 3, characterized in that: The corner reinforcement portion (1) is a thickened structure formed by fixing an independent fitting reinforcement block (2) on the corner body after the spring sheet is formed through a process, and the fitting reinforcement block (2) is in fitting contact with the spring sheet at the same time.

9. The corner reinforcing spring of a VCM motor according to claim 1, characterized in that: The thickness of the spring sheet is 0.03-0.1 mm.

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