Anti-torsion structure of voice coil motor
By designing a protrusion and a spring-loaded contact structure in the voice coil motor, the deflection of the lens carrier tube is limited, solving the problems of jamming and wear caused by lens module deflection, and ensuring the normal operation and service life of the lens module.
Patent Information
- Application Number
- CN202511129040.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2020-12-18
- Publication Date
- 2025-11-28
AI Technical Summary
Existing voice coil motors are easily affected by external forces or gravity when the lens moves, which can cause them to deflect, potentially leading to lens module jamming or the generation of abrasive particles, thus affecting shooting quality.
An anti-torsion structure for a voice coil motor was designed, comprising a lens carrier, a spring, multiple magnets, a voice coil, and a yoke. By setting first and second protrusions on the lens carrier to cooperate with the spring, the deflectable angle of the lens carrier is limited, and the spring force of the spring is used to reset it when deflected.
It effectively limits the deflection angle of the lens carrier tube, avoids friction between the lens carrier tube and the yoke, reduces the generation of wear debris, and ensures the normal operation and service life of the lens module.
Smart Images
Figure CN121036468A_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application belongs to the field of optical lens, more particularly to an anti-torsion structure of a voice coil motor. BACKGROUND
[0002] Due to the current smart mobile devices, almost all equipped with lens module. The miniaturization of lens module, driven lens lifting, or zoom, mainly through the voice coil motor to achieve.
[0003] The voice coil motor generally has a lens barrel, a voice coil, a magnet and a yoke, through the voice coil to receive the electrical signal, and the magnet to produce interaction, and then drive the lens to move. However, when the lens is moving, for example, in the Z direction forward / backward, it may still be subject to external force, or the force caused by its own gravity, resulting in the deflection of the lens and the lens barrel, such as moving towards the X direction, or Y direction.
[0004] When the lens barrel is over deflected, it may cause the whole lens module to be stuck, unable to lift. Although the slight deflection does not affect the lifting function of the lens module, but in the long run, it may be deflected, because the lens barrel and the yoke rub, and generate abrasive particles, which is easy to cause blockage, pollution problem, even affect the operation of the lens module, or the shooting quality. SUMMARY
[0005] To solve the above problems, the present application mainly provides a torsion-resistant structure of a voice coil motor, which comprises a base, a lens barrel, a spring sheet, a plurality of magnets, a voice coil and a yoke. The lens barrel is assembled on the base, and the lens barrel has a rim wall, which comprises a first protruding portion, a contact portion and a second protruding portion. The contact portion is located outside the first protruding portion, and the second protruding portion is located on the contact portion. The height of the second protruding portion is lower than that of the first protruding portion, and the first protruding portion and the second protruding portion extend along a direction perpendicular to the rim wall. The spring sheet is provided with a slot, and the first protruding portion passes through the slot, so that the spring sheet is arranged on a part of the rim wall and located above the contact portion. The voice coil is arranged around the outer periphery of the lens barrel. The magnets are arranged on the base and located on one side of the lens barrel, and the magnets are connected to the spring sheet. The yoke comprises a top wall and a side wall, the side wall is located on one side of the top wall and extends in a direction non-parallel to the top wall, and the yoke is connected to the base, so that the yoke surrounds the lens barrel, the spring sheet, the voice coil and the magnets. The top wall comprises a first wall, a connecting wall and a second wall, the connecting wall extends from one side of the first wall in a direction parallel to the side wall, and the second wall extends from one side of the connecting wall and is parallel to the first wall. The lens barrel has a deflectable angle relative to a horizontal reference line, the deflectable angle is an included angle deviating from the horizontal reference line, and the deflectable angle is not more than 2.7 degrees. When the lens barrel deviates from the horizontal reference line to the deflectable angle, the first protruding portion and the bottom of the first wall, the second protruding portion and the spring sheet are in contact at the same time, and the spring sheet is in contact with the bottom of the second wall, so that the lens barrel and the yoke interfere with each other.
[0006] In some embodiments, the lens barrel further comprises an inner protruding rim, and a channel is formed between the inner protruding rim and the first protruding portion. The first extending arm of the spring sheet is arranged in the channel.
[0007] In some embodiments, the distance between the first protruding portion and the first wall is 0.13-0.15 mm, and the distance between the second protruding portion and the spring sheet is 0.15-0.17 mm.
[0008] More specifically, in some embodiments, the contact portion has the second protruding portion, and the height of the second protruding portion is lower than that of the first protruding portion. The bottom of the second wall comprises a protruding block, and the height of the protruding block is smaller than that of the first protruding portion. When the lens barrel is deflected and deviates to the deflectable angle, the first protruding portion and the bottom of the first wall, the second protruding portion and the protruding block are in contact at the same time. Further, in some embodiments, the spring sheet has a second extending arm, and the second extending arm is located between the protruding block and the first protruding portion. Furthermore, in some embodiments, the second extending arm is spaced apart from the protruding block.
[0009] In some embodiments, the bottom of the second wall includes a protrusion, the height of which is less than that of the first protrusion. When the lens carrier tube deflects to a deflectable angle, the first protrusion abuts against the bottom of the first wall, and the protrusion abuts against the contact portion simultaneously. Further, in some embodiments, the spring has a second extension arm located between the protrusion and the first protrusion. Still further, in some embodiments, the second extension arm is spaced apart from the protrusion.
[0010] In some embodiments, the anti-torsion structure of the voice coil motor further includes a second spring, which is disposed between the base and the lens carrier, and is located on the upper and lower sides of the lens carrier, respectively.
[0011] As can be understood in the foregoing embodiments, the anti-torsion structure of the voice coil motor, through the design of the first protrusion and contact portion on the structure corresponding to the yoke on the lens carrier, can achieve the effect of limiting the lens lifting or deflection angle when subjected to external force, and is equipped with a spring to enable the lens carrier to quickly reset when a small angle deflection occurs, ensuring the service life of the overall lens module.
[0012] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this is not intended to limit the present invention. Attached Figure Description
[0013] Figure 1 This is a perspective view of the first embodiment of the anti-torsion structure of a voice coil motor.
[0014] Figure 2 This is an exploded view of the first embodiment of the anti-torsion structure of a voice coil motor.
[0015] Figure 3 This is a cross-sectional view of the first embodiment of the anti-torsion structure of a voice coil motor.
[0016] Figure 4 This is a cross-sectional view of the deflection state of the first embodiment of the anti-torsion structure of a voice coil motor.
[0017] Figure 5 This is a perspective view of a second embodiment of the anti-torsion structure for a voice coil motor.
[0018] Figure 6 This is a cross-sectional view of a second embodiment of the anti-torsion structure of a voice coil motor.
[0019] Figure 7 This is a cross-sectional view of the deflection state of the second embodiment of the anti-torsion structure of the voice coil motor.
[0020] Figure 8 This is a perspective view of the third embodiment of the anti-torsion structure of a voice coil motor.
[0021] Figure 9This is a partially exploded view of the third embodiment of the anti-torsion structure of a voice coil motor.
[0022] Figure 10 This is a cross-sectional view of the third embodiment of the anti-torsion structure of a voice coil motor.
[0023] Figure 11 This is a cross-sectional view of the deflection state of the third embodiment of the anti-torsion structure of the voice coil motor.
[0024] Figure 12 This is a cross-sectional view of the fourth embodiment of the anti-torsion structure of a voice coil motor.
[0025] Figure 13 This is a cross-sectional view of the deflection state of the fourth embodiment of the anti-torsion structure of the voice coil motor. Detailed Implementation
[0026] The structural and working principles of the present invention will be described in detail below with reference to the accompanying drawings:
[0027] The present invention will be further described below through specific embodiments. The accompanying drawings are merely illustrative to facilitate understanding of the invention, and their specific proportions may be adjusted according to design requirements. It should be understood that when an element is referred to as "connected" or "set" on another element, it may indicate that the element is directly located on the other element, or that an intermediate element may exist to connect the element to the other element. Conversely, when an element is referred to as "directly on another element" or "directly connected to another element," it is understood that this explicitly defines the absence of an intermediate element.
[0028] Furthermore, the terms "first," "second," and "third" are used only to distinguish one element, component, region, or part from another, and not to indicate a necessary order of precedence. Additionally, relative terms such as "lower" and "upper" may be used herein to describe the relationship between one element and another. It should be understood that relative terms are intended to include different orientations of the device beyond those shown in the figures. For example, if a device in a figure is flipped, an element described as being "lower" than other elements would be oriented "upper" than other elements. This indicates only a relative orientation, not an absolute one.
[0029] Figure 1 This is a perspective view of the first embodiment of the anti-torsion structure of a voice coil motor. Figure 2 This is an exploded view of the first embodiment of the anti-torsional structure of a voice coil motor. (See attached image.) Figure 1 and Figure 2As shown, the anti-torsion structure 1 of the voice coil motor in the first embodiment includes a base 10, a lens carrier 20, a spring 30, a magnet 40, a yoke 50, and a voice coil 60. The lens carrier 20 is assembled onto the base 10. The lens carrier 20 has a rim wall 21, which includes a first protrusion 211 and a contact portion 213, with the contact portion 213 located outside the first protrusion 211. The spring 30 has a slot 31 through which the first protrusion 211 passes, such that the spring 30 is disposed on a portion of the rim wall 21 and above the contact portion 213. The magnet 40 is disposed on the base 10 and located on one side of the lens carrier 20, and the magnet 40 is connected to the spring 30. Here, there can actually be one or more magnets 40, which can be located at a corner of the base 10 and outside the lens carrier 20. The yoke 50 includes a top wall 51 and a side wall 53. The side wall 53 is located on one side of the top wall 51 and extends in a direction not parallel to the top wall 51. Here, the side wall 53 extends in a direction approximately perpendicular to the top wall 51. The voice coil 60 is disposed around the outer periphery 23 of the lens carrier 20, for example, by being engaged in a recess of the outer periphery 23. The side wall 53 is connected to the base 10, such that the yoke 50 surrounds the lens carrier 20, the spring 30, the magnet 40, and the voice coil 60.
[0030] Here, see again Figure 2 The lens carrier 20 further includes an inner flange 25, which extends from the flange wall 21 toward the center of the lens carrier 20. A channel 251 is formed between the inner flange 25 and the first protrusion 211, and the first extension arm 33 of the spring 30 is disposed in the channel 251. In this way, the inner flange 25 and the first protrusion 211 limit the spring 30, preventing it from being displaced or falling off due to external forces or lens movement.
[0031] Figure 3 This is a cross-sectional view of the first embodiment of the anti-torsion structure of a voice coil motor. Figure 4 This is a cross-sectional view of the deflection state of the first embodiment of the anti-torsion structure of a voice coil motor. Also refer to... Figure 1 and Figure 2 , Figure 3 Along Figure 1A cross-section along line AA. The lens carrier 20 has a deflectable angle θ relative to the horizontal reference line L, where θ is the angle of deviation from the horizontal reference line L. The deflectable angle is 1 to 3 degrees, more specifically, not exceeding 2.7 degrees. Furthermore, when the lens carrier deviates from the horizontal reference line L to the maximum angle of deflectable angle θ, the first protrusion 211 abuts against the bottom of the top wall 51, and the contact portion 213 abuts against the spring piece 30 simultaneously, causing the lens carrier 20 to interfere with the yoke 50. Through the abutment of the first protrusion 211 against the yoke 50, the elastic force of the spring piece 30 can cause the lens carrier 20 to return to its original position, thereby limiting the deflectable angle θ of the lens carrier 20, thus avoiding friction between the lens carrier 20 and the yoke 50, minimizing the generation of wear debris, and preventing the possibility of the lens carrier 20 jamming.
[0032] The contact portion 213 has a second protrusion 215, the height of which is lower than that of the first protrusion 211. When the lens carrier 20 is deflected to the maximum angle of deflection θ, the second protrusion 215 abuts against the spring 30. Here, the first protrusion 211 and the second protrusion 215 extend in a direction perpendicular to the edge wall 21.
[0033] Figure 5 This is a perspective view of a second embodiment of the anti-torsion structure for a voice coil motor. Figure 6 This is a cross-sectional view of a second embodiment of the anti-torsion structure of a voice coil motor. Figure 7 This is a cross-sectional view of the deflection state of the second embodiment of the anti-torsion structure of the voice coil motor. Figure 6 Along Figure 5 A cross-section of the middle BB line. For example... Figure 5 to Figure 7 As shown, the second embodiment differs from the first embodiment in that the top wall 51 of the yoke 50 includes a first wall 511, a connecting wall 513, and a second wall 515. The connecting wall 513 extends from one side of the first wall 511 in a direction parallel to the side wall 53, and the second wall 515 extends from one side of the connecting wall 513 and is parallel to the first wall 511. Thus, the top wall 51 forms a stepped structure.
[0034] For ease of presentation, the illustrations here show the components in a symmetrical manner. However, it is understood that the yoke 50 can be formed by stamping, and the stepped structure can be located on one or more sides of the top wall of the yoke 50. That is, the structure of the second embodiment may also be provided on the same yoke 50 in conjunction with the structure of the first embodiment.
[0035] Furthermore, in the second embodiment, when the lens carrier 20 deflects to a deflectable angle θ, the second protrusion 215 on the contact portion 213 simultaneously abuts against the bottom of the first wall 511 and the spring piece 30, with the spring piece 30 abutting against the bottom of the second wall 515. Thus, the spring piece 30 can further achieve the effect of resetting the lens carrier 20 by the reaction force of abutting against the second wall 515. To achieve this effect, the distance D1 between the first protrusion 211 and the first wall 511 is 0.13 to 0.15 mm, preferably 0.138 to 0.145 mm. The distance D2 between the second protrusion 215 and the spring piece 30 is 0.15 mm to 0.17 mm, preferably 0.162 to 0.168 mm. Similarly, the second protrusion 215 can also be provided on one or more sides of the flange 21, which is the structure of the second embodiment, and may also be provided on the same yoke 50 in combination with the structure of the first embodiment.
[0036] Figure 8 This is a perspective view of the third embodiment of the anti-torsion structure of a voice coil motor. Figure 9 This is a partially exploded view of the third embodiment of the anti-torsion structure of a voice coil motor. Figure 10 This is a cross-sectional view of the third embodiment of the anti-torsion structure of a voice coil motor. Figure 11 This is a cross-sectional view of the deflection state of the third embodiment of the anti-torsion structure of the voice coil motor. Figure 10 It is along Figure 8 CC line profile. Figure 9 For the sake of showing the differences, only the lens carrier tube 20, the spring 30, and the yoke 50 are shown, and other components are omitted.
[0037] like Figure 8 to Figure 11 As shown, the third embodiment also has a stepped top wall 51 structure, similar to the second embodiment. However, the bottom of the second wall 515 includes a protrusion 517, the height of which is less than that of the first protrusion 211. The contact portion 213 does not have a second protrusion 215. When the lens carrier 20 deflects to a deflectable angle θ, the first protrusion 211 abuts against the bottom of the first wall 511, and the protrusion 517 abuts against the contact portion 213 simultaneously. Here, the deflectable angle θ of the lens carrier 20 is further limited by rigidity and interference between the hard components.
[0038] Similarly, for ease of presentation, the illustrations are presented in a symmetrical manner from both sides. However, it is understood that the structure of the third embodiment can also be configured in conjunction with the structure of the first embodiment. That is, the stepped top wall 51 and the protrusions 517 can be provided on one or more sides of the yoke 50.
[0039] In the third embodiment, the spring 30 has a second extension arm 35 located between the protrusion 517 and the first protrusion 211. Here, the second extension arm 35 can be considered as the spring 30 reducing its width to accommodate the protrusion 517 and maintain installation tolerances. However, this is merely an example and not intended to limit the scope; a slotted structure can also be used to accommodate the protrusion 517 and maintain installation tolerances. Here, the second extension arm 35 is spaced from the protrusion 517; however, this is only an example, and in some embodiments, the second extension arm 35 may actually contact the protrusion 517. Furthermore, for ease of presentation, both sides are shown symmetrically; however, the second extension arm 35 may actually be included on one or more sides of the spring 30.
[0040] Figure 12 This is a cross-sectional view of the fourth embodiment of the anti-torsion structure of a voice coil motor. Figure 13 This is a cross-sectional view of the deflection state of the fourth embodiment of the anti-torsion structure of a voice coil motor. (See attached image.) Figure 12 to Figure 13 As shown, the fourth embodiment combines the structures of the second and third embodiments, with a second protrusion 215 on the contact portion 213. The bottom of the second wall 515 includes a protrusion 517. When the lens carrier 20 deflects to the maximum angle of deflection θ, the first protrusion 211 abuts against the bottom of the first wall 511, and the second protrusion 215 abuts against the protrusion 517 simultaneously. Here, the deflection angle θ of the lens carrier 20 is further limited by rigidity and through inter-body interference.
[0041] Similarly, for ease of presentation, the illustrations are shown in a symmetrical manner from both sides. However, it is understood that the structure of the fourth embodiment can also be configured in conjunction with the structure of the first embodiment. That is, the stepped top wall 51, the protrusion 517, and the second protrusion 215 can be provided on one or more sides of the yoke 50. In addition, the yoke 50 of the third and fourth embodiments can also have the second wall 515 further recessed to form the protrusion 517. Similarly, in the fourth embodiment, the spring 30 has a second extension arm 35, which is located between the protrusion 517 and the first protrusion 211.
[0042] See again Figure 2 The anti-torsion structure 1 of the voice coil motor further includes a second spring 70, which is disposed between the base 10 and the lens carrier 20, and is located on the upper and lower sides of the lens carrier 20, respectively, along with the spring 30. Furthermore, the second spring 70 may also include a set of mirror-arranged second elastic arms 71, one side of which can be fixed to the lens carrier 20. This provides elasticity on the other side relative to the spring 30, allowing the lens carrier 20 to return to its original position more quickly when it undergoes a small angle of deflection.
[0043] In summary, the anti-torsion structure 1 of the voice coil motor, through the design of the first protrusion 211 and the contact part 213 on the lens carrier 20 corresponding to the structure of the yoke 50, can achieve the effect of limiting the lens lifting or being subjected to external force and the deflectable angle θ. Combined with the spring 30, it can quickly reset the lens carrier 20 when a small angle deflection occurs, ensuring the service life of the entire lens module.
[0044] Of course, the present invention may have other various embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art can make various corresponding changes and modifications according to the present invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.
Claims
1. A torsional anti-torsion structure for a voice coil motor, characterized in that, Include: Base; A lens carrier tube is assembled onto the base. The lens carrier tube has a rim wall, which includes a first protrusion, a contact portion, and a second protrusion. The contact portion is located outside the first protrusion, and the second protrusion is located on the contact portion. The height of the second protrusion is lower than that of the first protrusion. The first protrusion and the second protrusion extend in a direction perpendicular to the rim wall. The spring has a slot, and the first protrusion passes through the slot, so that the spring is disposed on a part of the edge wall and is located above the contact portion; The voice coil is disposed in the recess at the outer periphery of the lens carrier tube; Multiple magnets are respectively disposed on the base and located on one side of the lens carrier tube, and the magnets are connected to the spring sheet; as well as A yoke, comprising a top wall and a side wall, wherein the side wall is located on one side of the top wall and extends in a direction not parallel to the top wall, and is connected to the base, such that the yoke surrounds the lens carrier, the spring, the voice coil, and the magnet; the top wall comprises a first wall, a connecting wall, and a second wall; the connecting wall extends from one side of the first wall in a direction parallel to the side wall; the second wall extends from one side of the connecting wall and is parallel to the first wall. The lens carrier tube has a deflectable angle relative to the horizontal reference line. This deflectable angle is the angle deviating from the horizontal reference line, and the deflectable angle does not exceed 2.7 degrees. When the lens carrier tube deviates from the horizontal reference line to the deflectable angle, the first protrusion abuts against the bottom of the first wall, the second protrusion abuts against the spring piece, and the spring piece abuts against the bottom of the second wall, causing the lens carrier tube and the yoke to interfere with each other.
2. The anti-torsion structure of the voice coil motor as described in claim 1, characterized in that: The lens carrier tube further includes an inner flange, and a channel is formed between the inner flange and the first protrusion, with the first extension arm of the spring piece disposed in the channel.
3. The anti-torsional structure of the voice coil motor as described in claim 1, characterized in that: The distance between the first protrusion and the first wall is 0.13 to 0.15 mm, and the distance between the second protrusion and the spring piece is 0.15 mm to 0.17 mm.
4. The anti-torsional structure of the voice coil motor as described in claim 1, characterized in that: The bottom of the second wall includes a protrusion, the height of which is less than that of the first protrusion. When the lens carrier tube is deflected to the deflectable angle, the first protrusion abuts against the bottom of the first wall, and the second protrusion abuts against the protrusion.
5. The anti-torsion structure of the voice coil motor as described in claim 4, characterized in that: The spring has a second extension arm located between the protrusion and the first protrusion.
6. The anti-torsion structure of the voice coil motor as described in claim 5, characterized in that: The second extension arm is spaced apart from the protrusion.
7. The anti-torsional structure of the voice coil motor as described in claim 1, characterized in that: The bottom of the second wall includes a protrusion, the height of which is less than that of the first protrusion. When the lens carrier tube is deflected to the deflectable angle, the first protrusion abuts against the bottom of the first wall, and the protrusion abuts against the contact portion.
8. The anti-torsion structure of the voice coil motor as described in claim 7, characterized in that: The spring has a second extension arm located between the protrusion and the first protrusion.
9. The anti-torsion structure of the voice coil motor as described in claim 8, characterized in that: The second extension arm is spaced apart from the protrusion.
10. The anti-torsion structure of the voice coil motor as described in claim 1, characterized in that: The anti-torsion structure of the voice coil motor further includes a second spring, which is disposed between the base and the lens carrier, and is located on the upper and lower sides of the lens carrier, respectively.
11. The anti-torsion structure of the voice coil motor as described in claim 10, characterized in that: The second spring also includes a set of second elastic arms arranged mirror to each other, and one side of the second elastic arm is fixed to the lens carrier tube.