CN114137686A

CN114137686A - Corner reinforcing elastic sheet of VCM motor

Info

Publication number: CN114137686A
Application number: CN202111656293.5A
Authority: CN
Inventors: 卢煌杰; 黄崇瑜
Original assignee: Chengdu Yixun Photoelectric Technology Co ltd
Current assignee: Chengdu Yixun Photoelectric Technology Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-03-04

Abstract

The invention belongs to the technical field of voice coil motors, and discloses a corner reinforcing elastic sheet of a VCM motor, which is arranged in the motor to provide a motion reset force, is a sheet body with uniform thickness and at least has a corner bent along the width direction of the elastic sheet, wherein the corner is provided with a corner reinforcing part, and the average corner thickness of the corner reinforcing part is not more than twice of the thickness of the elastic sheet. The strength of the bent part of the spring is reinforced and enhanced through the bent part of the bent elastic sheet, so that the spring is prevented from being broken, or the joint reinforcing part is additionally arranged at the bent part of the bent spring for fixing, so that the spring is prevented from being broken; and under the strict parameter limitation of the reinforced elastic sheet, the K values in different directions change slightly, and the function requirements of the elastic sheet are met.

Description

Corner reinforcing elastic sheet of VCM motor

Technical Field

The invention belongs to the technical field of voice coil motors, and particularly relates to a corner reinforcing elastic sheet of a VCM motor.

Background

The VCM motor is a device that converts electric energy into mechanical energy and realizes linear and limited swing angle motion. The device generates regular movement by utilizing the interaction between the magnetic field from the permanent magnetic steel and the magnetic poles in the magnetic field generated by the conductor of the electrified coil. Because the voice coil motor is a non-commutation type power device, the positioning accuracy is completely dependent on the feedback and control system, and is independent of the voice coil motor. The VCM motor changes the smart phone camera from fixed focus to automatic focusing, and simultaneously endows a small or miniature camera with an anti-shake function, and the VCM motor has the greatest effect that the camera can automatically focus and also can provide motion compensation.

The VCM of the mobile phone camera needs Driver IC to complete focusing and anti-shake, the current VCM controls the magnitude of VCM power supply current through the Driver IC to determine the moving distance of a lens carried by the VCM, and therefore the VCM is adjusted to a proper position to shoot a clear image. The VCM motor actually moves by the principle that an energized coil receives an acting force in a magnetic field, and the precise control needs to be performed by some external components, wherein an elastic sheet is further needed to elastically limit and support the sensor or the lens module, so as to provide a support fixing effect and an elastic movement state.

However, with the increase of pixels, the requirements on the components inside the VCM motor are higher and higher, and particularly, the requirements on the thickness of the spring of the VCM motor for the spring type large pixel are higher and higher, which is developed from the common thickness of 0.035-0.04-0.05mm to the current thickness of 0.07-0.08-0.09mm, even thicker spring, the motor for the large pixel needs to be matched with the thicker spring, and the designer can design and match the relative spring K value and the spring stress to achieve the reasonable design requirements of the motor.

The existing motor spring pieces are often designed structurally and made of materials according to the kinetic energy of the borne modules, and in order to realize a large stretching stroke on a thin structure, a spiral long-strip structure can be formed in a limited space by arranging a plurality of corners. The elastic sheet structure can form stress concentration at the bending part, and the material is fatigued to generate cracks after a long time, so that the material is torn and damaged. Meanwhile, the bending treatment can damage the structure of the alloy material commonly used by the shrapnel such as BF158 and C1990GSH, and cracks or fractures appear after bending.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides a corner reinforcing spring plate of a VCM motor, which can not only enhance the structural strength of the spring plate and prolong the service life, but also has little influence on the K value of the spring coefficient after being reinforced by arranging a quantitative corner reinforcing part at the corner of the spring plate, thereby avoiding that the spring plate cannot meet the design requirement due to the change of the characteristics of the spring plate.

The technical scheme adopted by the invention is as follows:

in a first aspect, the present invention provides a corner reinforcing spring plate of a VCM motor, which is arranged in the motor to provide a motion restoring force, the spring plate is a plate with a uniform thickness and has at least one corner bent along a width direction of the spring plate, the corner has a corner reinforcing portion, and an average corner thickness of the corner reinforcing portion is not greater than twice the thickness of the spring plate.

It should be noted that the conventional spring plate has a substantially planar structure and generally has a uniform thickness, and is formed by cutting on the same sheet material. The width dimension of the elastic sheet is far larger than the thickness dimension, and when the elastic sheet is used, the elastic sheet is bent and deformed on a plane with the width with a larger surface area to realize elastic limit.

The above-mentioned sheet body with uniform thickness is a common application manner of the elastic sheet in the field, but it is anticipated that even if the elastic sheet itself has a thickening treatment in the thickness direction locally, it should be considered to be within the protection scope of the present invention, and the essence is mainly used for limiting the size limitation relationship in the present invention.

Meanwhile, the corner reinforcing part in the invention is also added and reinforced in the thickness direction of the elastic sheet, and is only limited to be arranged at the corner. The corner is a part of the elastic sheet which is obviously bent along the width direction, and the corner is different from the bent corner of the common elastic sheet in the same plane because the common elastic sheet can be regarded as a plane structure in an initial state. The bending corner in the same plane has better structural strength in the direction because the stress is mainly borne by the material in the width direction of the elastic sheet, and cracks are not easy to generate.

The corner in the invention refers to a bending mode which can generate a fold line on the surface of the width, and the stress is borne by the material in the thickness direction, and the stress is easy to break in the direction because the thickness of the corner is far lower than the width dimension.

It should be noted that the corner reinforcing portion is configured to be attached to the surface where the width of the elastic sheet is located, but the elastic sheet has two surfaces where the width is located, so that the average thickness refers to the overall increased thickness of the position where the corner reinforcing portion is located, and the corner reinforcing portion includes both one-sided arrangement and two-sided arrangement. But because the corner reinforcing part can be regarded as and form an organic whole structure with the shell fragment after fixed, only need guarantee the whole thickness of corner, then the unilateral sets up the material that adopts on the concave surface less, also can satisfy simultaneously and strengthen the requirement, is common mode.

With reference to the first aspect, the present invention provides the first implementation manner of the first aspect, wherein an average corner thickness of the corner reinforcing portion is not less than an elastic sheet thickness.

It is worth to be noted that the thickness of the corner reinforcing part changes in a gradually increasing manner, and a section of part with the same thickness is formed after smooth transition, and the thickness of the part has a range value, namely, the thickness of the part is at least more than or equal to the thickness of the elastic sheet, and is less than or equal to twice the thickness of the elastic sheet. That is, the thickness of the spring plate part added with the corner reinforcing part is 2-3 times of the thickness of the original spring plate.

And when the corner reinforcing part is arranged, the material with the average thickness reaching 1-2 times of the thickness of the elastic sheet is ensured to cover the whole bending part, and an extra stress concentration point caused by uneven local covering is avoided.

In combination with the first aspect or the first implementation manner of the first aspect, the invention provides a second implementation manner of the first aspect, and the corner of the elastic piece is one or more of a single-fold corner, a multi-section corner with multiple folds and an arc-shaped corner.

It should be noted that the single fold refers to that there is only one fold (macroscopically, a single fold) at the corner, and in this case, regardless of the angle, the fold is the stress concentration position, and the thickness may be greater than 2 times of the thickness of the elastic sheet. And the reinforced corner reinforcing part avoids the stress from being completely concentrated by at least two folds or smooth bending transition. The multiple creases achieve the target angle through multiple bending, and the reinforcement is realized in a single-side or double-side covering mode, so that compared with a single crease, the structural strength of the multiple creases is better. The mode of best intensity is smooth curved surface transition, namely the arc-shaped surface corner, the corner reinforcing part also adopts the arc-shaped surface transition mode at the moment, and meanwhile, the contact position of the corner reinforcing part and the elastic sheets which are straight at two sides is also arranged in a diameter-gradually-changing mode, so that the phenomenon that the additional stress concentration part is generated to influence the connection stability between the corner reinforcing part and the elastic sheets is avoided.

With reference to the first aspect or the first implementation manner of the first aspect, the present invention provides a third implementation manner of the first aspect, where a corner of the elastic piece is connected by a corner body having an included angle different from 0 between a width direction and a width direction of the elastic piece, and the corner body is connected with the elastic piece in a bending manner.

It should be noted that the structure of the present invention is mainly directed to a spring plate structure vertically disposed in a VCM motor, and the spring plate mainly provides elastic limit and support in XY directions, that is, an anti-shake limit in a plane direction perpendicular to an axis of a camera. In order to reduce the strength reduction at the corner as much as possible, another corner method is adopted, namely, the corner is connected with the elastic sheet parts at the two sides through the corner bodies which are arranged in parallel and are similar to a triangle by utilizing the larger width size of the corner.

With reference to the first aspect or the first implementation manner of the first aspect, the present invention provides a fourth implementation manner of the first aspect, wherein the corner reinforcing portion is a portion integrally formed with the elastic sheet.

With reference to the first aspect or the first implementation manner of the first aspect, the present invention provides a fifth implementation manner of the first aspect, wherein the corner reinforcing portion is a thickened structure formed by fixing an indefinite material at a corner of the elastic sheet after the elastic sheet is formed by a process.

In combination with the fifth embodiment of the first aspect, the invention provides a sixth embodiment of the first aspect, wherein the process comprises soldering and curing of the glue.

With reference to the first aspect or the first implementation manner of the first aspect, the present invention provides a seventh implementation manner of the first aspect, where the corner reinforcing portion is a thickened structure formed by fixing a separate attached reinforcing block at a corner of the elastic sheet after the elastic sheet is formed by a process.

With reference to the third implementation manner of the first aspect, the present invention provides an eighth implementation manner of the first aspect, wherein the corner reinforcing portion is a thickened structure formed by fixing an independent attaching reinforcing block on the corner body after the elastic sheet is formed through a process, and the attaching reinforcing block is in attaching contact with the elastic sheet at the same time.

With reference to the first aspect or the first implementation manner of the first aspect, the present disclosure provides a ninth implementation manner of the first aspect, wherein the thickness of the elastic sheet is 0.03 to 0.1 mm.

The invention has the beneficial effects that:

(1) according to the invention, various types of corner reinforcing part structures are added at the corners of the elastic sheet, so that the reinforcing structure is integrated with the elastic sheet or fixedly connected with the elastic sheet, the thickness requirement of the reinforcing structure can obviously reduce the stress at the corners, and meanwhile, the fracture improvement effect is obvious after the reliability experiment verification;

(2) according to the invention, through strict size limitation, the elastic characteristic of the elastic sheet is retained while the structural strength is improved, and the K value change rate is tested to be less than 1%, so that the elastic characteristic change caused by the structure change is avoided, and the subsequent elastic sheet tuning is not facilitated;

(3) the invention is suitable for bending modes of different corners through the arranged indefinite reinforcing structure and the single complete reinforcing structure, thereby satisfying the reinforcement of bending angles of various elastic sheets.

Drawings

FIG. 1 is a schematic diagram showing the comparison of the double thickness reinforcement of a bending spring using a right-angled corner in example 1 of the present invention;

FIG. 2 is a schematic diagram showing the enhanced comparison of the double thickness of a bending spring using a right-angled corner in the embodiment 1 of the present invention;

FIG. 3 is a comparative illustration of one-time thickness enhancement of a bending spring using a curved corner manner according to example 2 of the present invention;

FIG. 4 is a comparative illustration of the double thickness reinforcement of the bending spring in the form of the arc-shaped corner in example 2 of the present invention;

FIG. 5 is a comparison of the two-fold thickness enhancement of a bending spring in the two-fold corner manner according to example 3 of the present invention;

fig. 6 is an overall view of a spring plate blank member in which bending portions of a plurality of bending angles are adopted as a corner structure in embodiment 4 of the present invention;

FIG. 7 is a schematic diagram illustrating enhanced contrast at a corner of a single resilient piece of FIG. 6 according to the present invention;

FIG. 8 is a schematic diagram of a structural statics finite element analysis in ANSYS Workbench simulation software in example 1 of the present invention;

fig. 9 is a schematic view of another reinforcement mode in embodiment 4 of the present invention.

In the figure: 1-corner reinforcement and 2-joint reinforcement.

Detailed Description

The invention is further explained below with reference to the drawings and the specific embodiments.

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually placed when the product of the application is used, the description is only for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, should not be construed as limiting the present application. Furthermore, the appearances of the terms "first," "second," and the like in the description herein are only used for distinguishing between similar elements and are not intended to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical" and the like when used in the description of the present application do not require that the components be absolutely horizontal or overhanging, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present application, it should also be noted that, unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, e.g., as being fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

Example 1:

the present embodiment discloses a corner reinforcing spring plate of a VCM motor, which is applied to a voice coil motor used in a micro camera as an AF auto focus module or an OIS optical anti-shake module. Since the motor is small in size, the movement of the control member is generally restricted by electromagnetic force, and for better restriction, a sheet-type elastic sheet made of metal is used.

When the elastic sheet is assembled in the lens, the axial direction of the lens is taken as the Z axis, and the plane of the lens sensor establishes an XY axis coordinate system for explaining the relative position relationship.

The shrapnel in the embodiment mainly relates to two shrapnel models, namely C1990-GSH and BF158-TM10, wherein the C1990-GSH is a high-performance titanium copper material with high-grade strength in copper alloy, the thickness of the shrapnel is generally between 0.03 and 0.1mm, and the common thickness is between 0.03 and 0.06 mm.

The elastic sheet is a structure formed by etching on a whole metal plate body, generally has a plane structure, is formed by cutting the same metal plate body although having a plurality of coplanar bending points, and does not have internal stress without any bending treatment.

The elastic sheet of the planar structure is mainly used for elastically limiting and supporting the lens module on the Z axis in AF automatic focusing and is divided into a fixed end and a suspension wire part by structural characteristics, the fixed end is fixed on the corresponding part of the motor through dispensing or soldering, the suspension wire is of a straight line structure, and a bending part is arranged between adjacent suspension wires.

The elastic sheet related in the embodiment not only has a plane part, but also forms a part in the vertical direction on the same elastic sheet, namely, the suspension wires on the plane of the part of the elastic sheet are bent, so that the plane with the width can face the direction of X, Y, and the elastic limiting and supporting effect in the X, Y axis direction is provided for the bearing structure of the elastic sheet.

However, since the elastic sheet itself is formed by etching on the metal plate body, even if a vertical suspension wire portion is reserved, it needs to be bent after cutting and forming. And the elastic limiting and supporting effect is required to be provided from the X, Y axis in two directions, the bent suspension wire has at least one corner part, so that the suspension wire parts which are perpendicular to each other are formed.

Because there is a corner portion formed by the bending process, the corner portion has internal stress. As shown in fig. 1 and 2, the corner portions in this embodiment are treated as right angle corners of such a single fold. To this kind of corner, itself has the internal stress, can have stress concentration's the condition naturally when taking place elastic deformation simultaneously to lead to can appear breaking off the abnormal phenomenon because of its structural strength difference after certain time.

As shown in the figure, in the embodiment, the corner reinforcing cloth with one time of thickness of the elastic sheet and two times of thickness of the elastic sheet is added through a dispensing or soldering process, and the reinforced elastic sheet forms a part with average thickness of two times or three times of thickness at the corner of the reinforced elastic sheet, so that the structural strength of the reinforced elastic sheet is increased. And a plurality of creases or smooth transition are formed at the thickened corner, and the single crease with a macroscopic angle of 90 degrees is modified into a plurality of creases or smooth transition with small angles, so that the fracture risk is reduced. It should be noted that the term "fold" refers to a large arc angle change formed at a bend when viewed from a macroscopic view, and since only one fold line is viewed from the human eye, the fold line is referred to as "fold", but the fold line is a smooth natural bend of the material itself after being partially enlarged.

Different from other application fields, because this metal shrapnel mainly provides anti-shake spacing and support in XY axle direction for camera lens or the sensor part in the camera lens module, then need guarantee its elastic performance within a certain limit balanced, if directly thicken through conventional technological means, structural strength can be along with the increase of thickness and constantly strengthen. However, the elastic coefficient K of the elastic sheet in each direction changes, and once the change is large, the limiting and supporting effects of the whole elastic sheet are affected, in the mechanism requiring precise positioning and resetting, once the K changes, the internal electromagnetic structure also needs to be adjusted, and if the elastic deformation resistance is increased, the maximum electromagnetic acting force which can be provided by the electromagnetic coil can be exceeded, so that the lens or the sensor cannot be pushed to the corresponding position, and focusing failure or abnormal image shaking occurs. Above-mentioned condition also can't call for education in the later stage, whole shell fragment is scrapped and can't be used even.

The thickness range defined by the thickening treatment in the embodiment is crucial, and for a finished product of the same elastic sheet material with the thickness, the thickness is increased by at most two times, so that the change of the elastic coefficient K value in each direction is small on the premise of improving the structural strength. If the thickness is larger than the thickness, the structural strength is not obviously improved, and the change of the brought K value needs to adjust other parts, so that the cost is higher.

In order to verify the influence of the thickened size on the K value and the structural strength, the embodiment performs simulation on a plurality of groups of elastic sheets with different thicknesses to feed back the real situation, specifically as follows.

Aiming at the elastic sheet material with the thickness of 0.03mm, the strength of the ductile metal material is evaluated mainly by an equivalent stress tool through structural statics finite element analysis of ANSYS Workbench simulation software.

1. Data processed by spring plate with thickness of 0.03mm

The above table is that after thickening of one or two thicknesses is performed on a 0.03mm thick spring, it can be seen that the K value and the stress variation of the entire spring are not large in different deflection test processes, but it can be seen that, under a 0.03mm thick spring, the thickening of twice the thickness is already close to the acceptable maximum variation value for the stress variation in the x direction. If the thickness is increased continuously, the change of the K value can not meet the normal requirements of the elastic sheet adjustment and the function.

2. Data processed by spring plate with thickness of 0.04mm

The above table is a simulation test performed on a spring plate with a thickness of 0.04mm, and compared with 0.03mm, the stress change and the change of the K value under the thickness also meet the requirements.

3. Data processed by spring plate with thickness of 0.05mm

The above table is identical to 0.04 mm.

4. Data processed by shrapnel with thickness of 0.06mm

The above table shows that the thickness of the spring plate is 0.06mm, and it can be seen that the stress at the bending point of the spring plate with the thickness is reduced to some extent, and the change amount of the K value is the minimum, and it can be considered that the change of the K value is less influenced by the increase of the thickness of the spring plate after the thickness of the spring plate is increased.

In fig. 8, a rotation test chart of the simulation software after the thickness of two spring pieces is thickened by the 0.06mm spring piece is shown, and the graph itself is decolored and cannot show stress distribution, so that the simulation software is only shown as a numerical value and a simulation process.

Carry out reliability test to the corner and the thickening corner of this shell fragment simultaneously, the experimental data is as follows:

it can be seen that, under the condition that the elastic sheets with different thicknesses are not reinforced after data simulation, the fracture phenomenon exists in 100% of bad proportions after the elastic sheet bending test, the test results are both Fail, and the test curve in the RA test is seriously disordered. The bad proportion of the reinforced corner is 0, no fracture phenomenon exists, the curve in the test is smooth, and the result of reinforcing the thickness of at least one elastic sheet is optimal.

In summary, it can be considered through simulation tests that the optimal thickness range value for thickening at the simplest right-angle corner is in the range of one to two times of thickness for the spring sheet with the thickness (which is also the thickness of the common spring sheet in the field).

Example 2:

in this embodiment, the same as embodiment 1, and a corner reinforcing spring of a VCM motor is also disclosed, as shown in fig. 3 and 4, it can be seen that, when the corner of the spring is in an arc corner manner, the reinforced corner surface is also an arc surface.

Similarly to embodiment 1, the corner reinforcing part 1 in this embodiment is reinforced only at the inner side by soldering or dispensing, and the reinforcing part is shown by a solid line in the figure, and the corner part after actual processing is an integral structure.

Due to the adoption of the arc-shaped surface transition, the stress distribution is uniform, no macroscopic stress concentration point exists, the test is carried out after the elastic sheet is strengthened, the result has the same rule with the embodiment 1, and on the premise that the corner of the elastic sheet with one to two thicknesses is increased and the structural strength is better, the change of the K value can be kept within an acceptable range.

Example 3:

in this embodiment, the same as embodiment 1, a corner reinforcing spring plate of a VCM motor is disclosed, as shown in fig. 5, it can be seen that the corner of the spring plate is a plurality of bending processing modes of a plurality of folding lines, which is also the most common bending processing mode in the process. The corner treatment has better structural strength than a single fold, and the reinforced corner surface is also a surface with a plurality of folds.

The result of the test performed after the spring plate is strengthened has the same rule as that of the test performed in embodiment 1, and the change of the K value can be kept within an acceptable range on the premise that one to two thickness corner portions of the spring plate have better structural strength.

Example 4:

this embodiment is the same as embodiment 1, and discloses a corner reinforcing spring plate of a VCM motor, as shown in fig. 6, the spring is a support suspension wire having X, Y, Z axis direction at the same time, and the corner processing is mainly directed to the corner connection with the spring plate suspension wire vertically arranged in the X, Y axis direction.

Unlike the above embodiments, the corner processing of the vertical suspension portion of the spring plate is shown in fig. 9. The corner part in the embodiment is transited by adopting a corner body, the corner body belongs to an integrally formed part of the elastic sheet, a similar triangular structure is formed during cutting, and the corner body is connected with the suspension wires with two sides perpendicular to each other through two equal-width parts. When the two side elastic sheet parts need to be folded, two 45-degree and symmetrical bending parts are formed at the parts. The corner structure connected by the corner body is easier to process in process.

For the corner structure, the two bending positions of the corner body are respectively subjected to dispensing or soldering strengthening treatment, the strength change and the K value change after the treatment are the same as those in embodiment 1, the optimal thickening condition is that the thickness of one or two elastic sheets is one, and the K value change is small.

Further, as shown in fig. 7, in order to be suitable for the reinforcement of the corner structure, the present embodiment further separately sets a plastic block, the thickness of which is equal to twice the thickness of the elastic sheet, and the plastic block has an end surface attached to the surface of the elastic sheet and is fixed at the corner by means of glue, so as to form an attaching reinforcement part 2 attached and contacted with the elastic sheets at the two sides and the bottom corner body at the same time.

This laminating rib 2 can bring better corner structure for whole shell fragment to strengthen equally, is 0 through the shell fragment defective rate of reliability test after strengthening, simultaneously because itself adopts softer plastics material, and the quality is lighter, and its elasticity is less than shell fragment itself, and then though bulky, the K value of the shell fragment after the thickening process has not taken place great change yet, accords with the shell fragment requirement.

The present invention is not limited to the above-described alternative embodiments, and various other forms of products can be obtained by anyone in light of the present invention. The above detailed description should not be taken as limiting the scope of the invention, which is defined in the claims, and which the description is intended to be interpreted accordingly.

Claims

1. The utility model provides a shell fragment corner additional strengthening of VCM motor, wherein the shell fragment is the homogeneous thickness lamellar body, and has a corner of bending along shell fragment width direction at least, its characterized in that: including setting up corner reinforcing part (1) in the corner, the average corner thickness of corner reinforcing part (1) is not more than the twice of shell fragment thickness.

2. The spring plate corner reinforcing structure of a VCM motor according to claim 1, wherein: the average corner thickness of the corner reinforcing part (1) is not less than the thickness of the elastic sheet.

3. The spring plate corner reinforcing structure of a VCM motor according to claim 1 or 2, wherein: the corner of the elastic sheet is one or more of a single crease corner, a multi-section corner with a plurality of creases and an arc-shaped surface corner.

4. A corner reinforcing spring of a VCM motor according to claim 1 or 2, wherein: the corner of the elastic sheet is in a corner body connection mode that an included angle which is not 0 is formed between the width direction of the elastic sheet and the width direction of the elastic sheet, and the corner body is connected with the elastic sheet in a bending mode.

5. A corner reinforcing spring of a VCM motor according to claim 1 or 2, wherein: the corner reinforcing part (1) is a part which is integrally formed with the elastic sheet.

6. A corner reinforcing spring of a VCM motor according to claim 1 or 2, wherein: the corner reinforcing part (1) is a thickened structure formed by fixing an indefinite material at the corner of the elastic sheet after the elastic sheet is molded by a process.

7. The corner reinforcing spring of a VCM motor according to claim 6, wherein: the process includes soldering and curing of the glue.

8. A corner reinforcing spring of a VCM motor according to claim 1 or 2, wherein: the corner reinforcing part (1) is a thickened structure formed by fixing an independent attaching reinforcing block (2) at the corner of the elastic sheet after the elastic sheet is formed through a process.

9. The corner reinforcing spring of a VCM motor according to claim 4, wherein: the corner reinforcing part (1) is a thickened structure formed by fixing an independent attaching reinforcing block (2) on a corner body after the elastic sheet is formed through a process, and the attaching reinforcing block (2) is attached and contacted with the elastic sheet simultaneously.

10. A corner reinforcing spring of a VCM motor according to claim 1 or 2, wherein: the thickness of the elastic sheet is 0.03-0.1 mm.