Anti-torsion structure of voice coil motor

Abstract

A torsion-resistant structure of a voice coil motor comprises a base, a lens carrier, a spring, a magnet and a yoke. The lens carrier is assembled on the base, and the lens carrier has an edge wall, and the edge wall comprises a first protrusion and a contact portion, and the contact portion is located on the outside of the first protrusion. The spring is provided with a slot, and the first protrusion passes through the slot, so that the spring is arranged on a part of the edge wall and is located above the contact portion. The magnet is arranged on the base and is located on one side of the lens carrier, and the magnet is connected to the spring. The yoke comprises a top wall and a side wall, and 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, so that the yoke surrounds the lens carrier, the spring and the magnet. The lens carrier has a deflectable angle relative to the horizontal reference line, and the deflectable angle is the angle deviated from the horizontal reference line.

Description

Technical Field

[0001] The present invention belongs to the field of optical lenses, and more specifically relates to an anti-torsion structure of a voice coil motor. Background Art

[0002] Since almost all current smart mobile devices are equipped with a lens module, the miniaturization of the lens module is mainly achieved by using a voice coil motor to drive the lens up and down, or zoom.

[0003] A voice coil motor typically consists of a lens carrier, a voice coil, a magnet, and a yoke. The voice coil receives electrical signals, interacting with the magnet to drive the lens. However, when the lens moves, such as forward or backward in the Z direction, it may be subject to external forces or gravity, causing the lens and lens carrier to deflect, for example, in the X or Y direction.

[0004] Excessive deflection of the lens barrel can cause the entire lens module to become stuck, preventing it from being raised or lowered. While slight deflection does not affect the lens module's ability to be raised or lowered, long-term deflection can cause friction between the lens barrel and the yoke, generating wear debris that can easily cause blockage and contamination, potentially affecting the operation of the lens module and image quality. Summary of the Invention

[0005] In order to solve the above problems, the present invention mainly provides an anti-torsion structure of a voice coil motor, which includes a base, a lens carrier, a spring, a magnet and a yoke. The lens carrier is assembled on the base, and the lens carrier has an edge wall. The edge wall includes a first protrusion and a contact portion, and the contact portion is located on the outside of the first protrusion. The spring is provided with a slot, and the first protrusion passes through the slot, so that the spring is arranged on a part of the edge wall and is located above the contact portion. The magnet is provided on the base and is located on one side of the lens carrier, and the magnet is connected to the spring. The yoke includes a top wall and a side wall, and 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, so that the yoke surrounds the lens carrier, the spring and the magnet. The lens carrier has a deflectable angle relative to the horizontal reference line, and the deflectable angle is the angle deviated from the horizontal reference line.

[0006] In some embodiments, the deflectable angle does not exceed 2.7 degrees.

[0007] In some embodiments, when the lens carrier deviates from the horizontal reference line to a deflectable angle, the first protrusion and the bottom of the top wall, and the contact portion and the spring or the bottom of the top wall simultaneously abut, causing the lens carrier and the yoke to interfere with each other.

[0008] In some embodiments, the lens carrier tube further includes an inner flange, a groove is defined between the inner flange and the first protrusion, and the first extension arm of the spring is disposed in the groove.

[0009] In some embodiments, the contact portion has a second protrusion, the height of the second protrusion is lower than the first protrusion, and when the lens carrier is deflected and deviates to a deflectable angle, the second protrusion abuts against the spring.

[0010] In some embodiments, the top wall includes 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.

[0011] More specifically, in some embodiments, the contact portion includes a second protrusion, which is lower in height than the first protrusion. When the lens carrier tube deflects to a deflectable angle, the first protrusion simultaneously abuts the bottom of the first wall and the second protrusion abuts the spring, with the spring abutting the bottom of the second wall. Furthermore, in some embodiments, 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 is 0.15 to 0.17 mm.

[0012] In more detail, in some embodiments, the contact portion has a second protrusion, the height of the second protrusion being lower than the first protrusion. The bottom of the second wall includes a protrusion, the height of the protrusion being lower than the first protrusion. When the lens carrier is deflected and deviates to a deflectable angle, the first protrusion abuts the bottom of the first wall, and the second protrusion abuts the protrusion simultaneously. Furthermore, in some embodiments, the spring has a second extension arm, and the second extension arm is located between the protrusion and the first protrusion. Furthermore, in some embodiments, the second extension arm does not contact the protrusion.

[0013] In some embodiments, the bottom of the second wall includes a protrusion, the protrusion being shorter than the first protrusion. When the lens carrier is deflected to a deflectable angle, the first protrusion simultaneously abuts the bottom of the first wall, the protrusion, and the contact portion. Furthermore, in some embodiments, the spring has a second extension arm positioned between the protrusion and the first protrusion. Furthermore, in some embodiments, the second extension arm is spaced apart from the protrusion.

[0014] It can be understood in the aforementioned embodiments that the anti-torsion structure of the voice coil motor is designed with a first protrusion and a contact structure by corresponding to the structure of the yoke iron part on the lens carrier, which can achieve the effect of limiting the lens lifting or deflection angle when subjected to external force, and is equipped with a spring clip so that the lens carrier can be quickly reset when a small angle deflection occurs, thereby ensuring the service life of the entire lens module.

[0015] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments, but this does not limit the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A perspective view of a first embodiment of an anti-torsion structure of a voice coil motor.

[0017] Figure 2 Exploded view of the first embodiment of the anti-torsion structure of a voice coil motor.

[0018] Figure 3 2 is a cross-sectional view of a first embodiment of an anti-torsion structure of a voice coil motor.

[0019] Figure 4 FIG. 1 is a cross-sectional view of a first embodiment of an anti-torsion structure of a voice coil motor in a deflected state.

[0020] Figure 5 A perspective view of a second embodiment of an anti-torsion structure of a voice coil motor.

[0021] Figure 6 FIG. 4 is a cross-sectional view of a second embodiment of an anti-torsion structure of a voice coil motor.

[0022] Figure 7 FIG. 4 is a cross-sectional view of a second embodiment of an anti-torsion structure of a voice coil motor in a deflected state.

[0023] Figure 8 A perspective view of a third embodiment of an anti-torsion structure of a voice coil motor.

[0024] Figure 9 A partial exploded view of the third embodiment of the anti-torsion structure of a voice coil motor.

[0025] Figure 10 FIG. 4 is a cross-sectional view of a third embodiment of an anti-torsion structure of a voice coil motor.

[0026] Figure 11 FIG. 4 is a cross-sectional view of a third embodiment of an anti-torsion structure of a voice coil motor in a deflected state.

[0027] Figure 12 FIG. 4 is a cross-sectional view of a fourth embodiment of an anti-torsion structure of a voice coil motor.

[0028] Figure 13 FIG. 4 is a cross-sectional view of a fourth embodiment of an anti-torsion structure of a voice coil motor in a deflected state. DETAILED DESCRIPTION

[0029] The structural principle and working principle of the present invention are described in detail below with reference to the accompanying drawings:

[0030] The present invention is further described below through specific embodiments. The figures of the present invention are for illustrative purposes only to facilitate understanding of the present invention, and their specific proportions may be adjusted according to design requirements. It should be understood that when an element is referred to as being "connected" or "disposed" on another element, it can mean that the element is directly located on the other element, or there may be an intermediate element connecting the element to the other element. Conversely, when an element is referred to as being "directly on" or "directly connected to" another element, it is understood that this clearly defines the absence of intermediate elements.

[0031] In addition, the terms "first," "second," and "third" are only used to distinguish one element, component, region, or part from another element, component, region, layer, or part, and do not necessarily indicate a sequential order. In addition, relative terms such as "lower" and "upper" may be used herein to describe the relationship between one element and another element. It should be understood that relative terms are intended to include different orientations of the device in addition to the orientation shown in the figure. For example, if a device in a figure is turned over, the element described as being on the "lower" side of the other elements will be oriented on the "upper" side of the other elements. This only represents a relative orientation relationship, not an absolute orientation relationship.

[0032] Figure 1 A perspective view of a first embodiment of an anti-torsion structure of a voice coil motor. Figure 2 FIG1 is an exploded view of the first embodiment of the anti-torsion structure of the voice coil motor. Figure 1 and Figure 2 As shown, the anti-torsion structure 1 of the voice coil motor of the first embodiment includes a base 10, a lens barrel 20, a spring 30, a magnet 40, a yoke 50, and a voice coil 60. The lens barrel 20 is assembled to the base 10. The lens barrel 20 has an edge wall 21, which includes a first protrusion 211 and a contact portion 213. The contact portion 213 is located outside the first protrusion 211. The spring 30 has a slot 31, and the first protrusion 211 passes through the slot 31, so that the spring 30 is disposed on a portion of the edge wall 21 and is located above the contact portion 213. The magnet 40 is disposed on the base 10 and is located on one side of the lens barrel 20. The magnet 40 is connected to the spring 30. Here, there can be one or more magnets 40, which can be located at a corner of the base 10 and outside the lens barrel 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 that is not parallel to the top wall 51. Here, the side wall 53 extends in a direction that is substantially perpendicular to the top wall 51. The voice coil 60 is disposed around the outer periphery 23 of the lens barrel 20, for example, being secured within a recessed portion of the outer periphery 23. The side wall 53 is connected to the base 10, such that the yoke 50 surrounds the lens barrel 20, the spring 30, the magnet 40, and the voice coil 60.

[0033] Here again, see Figure 2 The lens carrier barrel 20 further includes an inner flange 25 that extends from the edge wall 21 toward the center of the lens carrier barrel 20. A groove 251 is defined between the inner flange 25 and the first protrusion 211. The first extension arm 33 of the spring clip 30 is disposed in the groove 251. Thus, the inner flange 25 and the first protrusion 211 restrain the spring clip 30, preventing it from shifting or falling off due to external forces or when the lens is moved.

[0034] Figure 3 2 is a cross-sectional view of a first embodiment of an anti-torsion structure of a voice coil motor. Figure 4 This is a cross-sectional view of the deflected state of the first embodiment of the anti-torsion structure of the voice coil motor. Figure 1 and Figure 2 , Figure 3 Along Figure 1 The cross section of the middle AA line. The lens barrel 20 has a deflectable angle θ relative to the horizontal reference line L, and the deflectable angle θ is the angle of deviation from the horizontal reference line L. The deflectable angle is 1 to 3 degrees, and in more detail, not more than 2.7 degrees. In addition, when the lens barrel deviates from the horizontal reference line L to the maximum value of the deflectable angle θ, the first protrusion 211 and the bottom of the top wall 51, the contact portion 213 and the spring 30 abut at the same time, so that the lens barrel 20 and the yoke 50 interfere with each other. Through the abutment of the first protrusion 211 and the yoke 50, the elastic force of the spring 30 can prompt the lens barrel 20 to reset, thereby limiting the deflectable angle θ of the lens barrel 20, thereby avoiding friction between the lens barrel 20 and the yoke 50, reducing the generation of wear debris, and avoiding the possibility of the lens barrel 20 getting stuck.

[0035] The contact portion 213 has a second protrusion 215. The second protrusion 215 is lower in height than the first protrusion 211. When the lens carrier 20 deflects to a maximum deflectable angle θ, the second protrusion 215 abuts against the spring 30. The first protrusion 211 and the second protrusion 215 extend perpendicular to the edge wall 21.

[0036] Figure 5 A perspective view of a second embodiment of an anti-torsion structure of a voice coil motor. Figure 6 FIG. 4 is a cross-sectional view of a second embodiment of an anti-torsion structure of a voice coil motor. Figure 7 FIG. 4 is a cross-sectional view of a second embodiment of an anti-torsion structure of a voice coil motor in a deflected state. Figure 6 Along Figure 5 The cross section of the midline BB. Figures 5 to 7As 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 in a direction parallel to the first wall 511. Thus, the top wall 51 forms a stepped structure.

[0037] For ease of presentation, the diagram is shown in a bilaterally 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. In other words, the structure of the second embodiment can also be arranged on the same yoke 50 in combination with the structure of the first embodiment.

[0038] Furthermore, in the second embodiment, when the lens carrier 20 deflects to the deflectable angle θ, the first protrusion 211 and the second protrusion 215 simultaneously abut against the bottom of the first wall 511 and the spring 30, with the spring 30 abutting against the bottom of the second wall 515. This allows the spring 30 to effectively reset the lens carrier 20 by the reaction force generated by the abutment 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 30 is 0.15 to 0.17 mm, preferably 0.162 to 0.168 mm. Likewise, the second protrusion 215 may also be disposed on one or more sides of the edge wall 21 , that is, the structure of the second embodiment, and may also be disposed on the same yoke 50 in conjunction with the structure of the first embodiment.

[0039] Figure 8 A perspective view of a third embodiment of an anti-torsion structure of a voice coil motor. Figure 9 A partial exploded view of the third embodiment of the anti-torsion structure of a voice coil motor. Figure 10 FIG. 4 is a cross-sectional view of a third embodiment of an anti-torsion structure of a voice coil motor. Figure 11 FIG. 4 is a cross-sectional view of a third embodiment of an anti-torsion structure of a voice coil motor in a deflected state. Figure 10 It is along Figure 8 CC line section. Figure 9 Just to express the difference, only the lens carrier 20, the spring 30 and the yoke 50 are shown, and other elements are omitted.

[0040] like Figures 8 to 11As shown, the third embodiment also has a stepped top wall 51 structure like the second embodiment, but the bottom of the second wall 515 includes a protrusion 517, which is shorter than the first protrusion 211. The contact portion 213 lacks the second protrusion 215. When the lens carrier 20 deflects to the allowable deflection angle θ, the first protrusion 211 and the bottom of the first wall 511, and the protrusion 517 and the contact portion 213, simultaneously abut. Here, the allowable deflection angle θ of the lens carrier 20 is further limited by rigidity, through interference between hardware components.

[0041] Likewise, for ease of presentation, the figures show bilateral symmetry. However, it is understood that the structure of the third embodiment can also be combined with the structure of the first embodiment. That is, the stepped top wall 51 and the protrusion 517 can be provided on one or more sides of the yoke 50.

[0042] In the third embodiment, the spring clip 30 includes 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 clip 30 reducing its width to accommodate the protrusion 517, thereby maintaining installation tolerances. However, this is merely an example and not intended to be limiting. Alternatively, a slotted structure could be used to accommodate the protrusion 517 and maintain installation tolerances. Here, the second extension arm 35 is spaced apart from the protrusion 517, but this is merely an example. In some embodiments, the second extension arm 35 may contact the protrusion 517. Furthermore, for ease of illustration, the illustration is bilaterally symmetrical; however, the second extension arm 35 could also be included on one or more sides of the spring clip 30.

[0043] Figure 12 FIG. 4 is a cross-sectional view of a fourth embodiment of an anti-torsion structure of a voice coil motor. Figure 13 FIG. 4 is a cross-sectional view of a fourth embodiment of the anti-torsion structure of a voice coil motor in a deflected state. Figures 12 to 13 As shown, the structure of the fourth embodiment combines the structures of the second and third embodiments. The contact portion 213 includes a second protrusion 215. The bottom of the second wall 515 includes a bump 517. When the lens carrier 20 deflects to the maximum deflectable angle θ, the first protrusion 211 and the bottom of the first wall 511, as well as the second protrusion 215 and the bump 517, simultaneously abut. Here, the deflectable angle θ of the lens carrier 20 is further limited by rigidity, through interference between hardware components.

[0044] Similarly, for ease of presentation, the figures are all presented in a bilaterally symmetrical manner. However, it is understood that the structure of the fourth embodiment can also be arranged 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 arranged on one or more sides of the yoke 50. In addition, the yoke 50 of the third and fourth embodiments can also be further recessed in the second wall 515 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.

[0045] See again Figure 2 The voice coil motor's anti-torsion structure 1 further includes a second spring plate 70, which is disposed between the base 10 and the lens barrel 20. The second spring plate 70 and the spring plate 30 are located on the upper and lower sides of the lens barrel 20, respectively. Furthermore, the second spring plate 70 may include a pair of second elastic arms 71 arranged in a mirror-image arrangement, with one side of the second elastic arm 71 fixed to the lens barrel 20. This provides elastic force on the side opposite the spring plate 30, allowing the lens barrel 20 to quickly return to its original position even when slightly deflected.

[0046] In summary, the anti-torsion structure 1 of the voice coil motor is designed with a first protrusion 211 and a contact portion 213 by corresponding to the structure of the yoke 50 on the lens carrier 20, which can achieve the effect of limiting the lens lifting or deflection angle θ when subjected to external force, and is equipped with a spring 30 so that the lens carrier 20 can be quickly reset when a small angle deflection occurs, thereby ensuring the service life of the entire lens module.

[0047] Of course, the present invention may have many other embodiments. Without departing from the spirit and essence of the present invention, those skilled in the art may make various corresponding changes and modifications based on the present invention, but these corresponding changes and modifications should all fall within the scope of protection of the claims attached to the present invention.

Claims

1. An anti-torsion structure of a voice coil motor, characterized in that: Include: base; a lens carrier tube assembled on the base, the lens carrier tube having an edge wall, the edge wall including a first protrusion, a contact portion, and a second protrusion, the contact portion being located outside the first protrusion, the second protrusion being located on the contact portion, the second protrusion being lower in height than the first protrusion, wherein the first protrusion and the second protrusion extend in a direction perpendicular to the edge wall; a spring piece having a slot, wherein the first protrusion passes through the slot, so that the spring piece is disposed on a portion of the edge wall and is located above the contact portion; A magnet is provided on the base and located on one side of the lens carrier, and the magnet is connected to the spring; as well as The yoke comprises 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, so that the yoke surrounds the lens carrier, the spring and the magnet, and the top wall comprises a first wall, a connecting wall and a second wall, wherein 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 carrier tube has a deflectable angle relative to the horizontal reference line, and the deflectable angle is the angle from the horizontal reference line, and the deflectable angle does not exceed 2.7 degrees. When the lens carrier deviates from the horizontal reference line to a deflectable angle, the first protrusion and the bottom of the first wall, the second protrusion and the spring plate abut against each other at the same time, and the spring plate abuts against the bottom of the second wall, so that the lens carrier and the yoke interfere with each other.

2. The anti-torsion structure of a voice coil motor according to claim 1, wherein: The lens carrier tube further includes an inner flange, a groove is defined between the inner flange and the first protrusion, and the first extension arm of the spring is disposed in the groove.

3. The anti-torsion structure of a voice coil motor according to claim 1, wherein: 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 elastic sheet is 0.15 to 0.17 mm.

4. The anti-torsion structure of a voice coil motor according to claim 1, wherein: The bottom of the second wall includes a protrusion, the height of which is smaller than that of the first protrusion. When the lens carrier is deflected and deviates to the deflectable angle, the first protrusion and the bottom of the first wall and the second protrusion and the protrusion are simultaneously in contact.

5. The anti-torsion structure of a voice coil motor according to claim 4, wherein: The elastic piece has a second extending arm, and the second extending arm is located between the protrusion and the first protrusion.

6. The anti-torsion structure of a voice coil motor according to claim 5, wherein: The second extension arm is spaced apart from the protrusion.

7. The anti-torsion structure of a voice coil motor according to claim 1, wherein: The bottom of the second wall includes a protrusion, the height of which is smaller than that of the first protrusion. When the lens carrier is deflected and deviates to the deflectable angle, the first protrusion and the bottom of the first wall, and the protrusion and the contact portion abut simultaneously.

8. The anti-torsion structure of a voice coil motor according to claim 7, wherein: The elastic piece has a second extending arm, and the second extending arm is located between the protrusion and the first protrusion.

9. The anti-torsion structure of a voice coil motor according to claim 8, wherein: The second extension arm is spaced apart from the protrusion.

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