Lens drive device

Abstract

This utility model belongs to the field of optical component technology, specifically relating to a lens driving device, including a base, an AF carrier, and a prism carrier. The AF carrier can move within the base along a first direction, and the prism carrier can rotate within the base around the first direction and a second direction perpendicular to the first direction. The AF carrier has a first connecting portion for mounting a first lens, and the base has a second connecting portion for mounting a second lens, the second connecting portion being located at the rear of the AF carrier. The lens driving device also includes an AF driving mechanism, which drives the AF carrier to move along the first direction in front of the second connecting portion. In this utility model, the AF carrier can move back and forth within the base. The first lens is mounted on the AF carrier to achieve zoom operation, while the second lens is mounted on the base and located at the rear of the AF carrier, and does not move. The first and second lenses cooperate to achieve dual-lens focusing operation.

Description

Technical Field

[0001] This utility model belongs to the field of optical component technology, specifically relating to a lens driving device. Background Technology

[0002] In recent years, with the development of technology, many electronic devices now have the function of taking pictures or recording videos. The use of these electronic devices is becoming more and more common, and they are developing towards a more convenient and thinner design to provide users with more choices.

[0003] In practice, to adapt to various shooting scenarios, the lens needs constant focusing. Current technology typically uses a lens drive mechanism to move the lens along the optical axis to adjust the focal length. However, electronic devices usually only have one lens. Therefore, achieving different zoom levels while maintaining a slim and lightweight lens drive mechanism is a crucial issue. Utility Model Content

[0004] The present invention addresses the aforementioned technical problems by providing a lens driving device.

[0005] A lens driving device includes a base, an AF carrier, and a prism carrier. The AF carrier is movable within the base along a first direction, and the prism carrier is rotatable within the base about the first direction and a second direction perpendicular to the first direction.

[0006] The AF carrier is provided with a first connecting part for mounting a first lens, and the base is provided with a second connecting part for mounting a second lens. The second connecting part is located on the rear side of the AF carrier.

[0007] The lens driving device also includes an AF driving mechanism, which drives the AF carrier to move along a first direction in front of the second connecting part.

[0008] Optionally, the lens driving device further includes a prism driving mechanism, which drives the prism carrier to move along a first direction behind the second connecting portion.

[0009] Optionally, the lens driving device further includes a housing, which is connected to the base to form a hollow cavity. The AF carrier, the prism carrier, the AF driving mechanism and the prism driving mechanism are all located in the hollow cavity. The housing is provided with two light-entry holes along the first direction.

[0010] The lens driving device further includes a mask and a mask driving mechanism located in the hollow cavity. The mask is located above the prism carrier, and the mask driving mechanism drives the mask to move along a first direction above the prism carrier.

[0011] The prism carrier is provided with a prism mounting part. When the prism driving mechanism drives the prism mounting part to be located below one of the light inlets, the mask driving mechanism drives the mask to be located below the other light inlet.

[0012] Optionally, the lens driving device further includes an AF guide rod, which is disposed on the other side of the base. The two ends of the AF guide rod along the first direction are respectively fixed on the base. An AF guide groove is provided on the other side of the AF carrier. The AF guide rod passes through the AF guide groove along the first direction. When the AF driving mechanism drives one side of the AF carrier to move along the first direction, the other side of the AF carrier moves on the AF guide rod through the AF guide groove.

[0013] Optionally, the AF drive mechanism is an AF piezoelectric mechanism, which is disposed on one side of the AF carrier and drives the AF carrier to move along a first direction.

[0014] Optionally, the AF piezoelectric mechanism includes an AF piezoelectric block and an AF friction rod. The AF piezoelectric block is disposed on one side of the base, one end of the AF friction rod is connected to the AF piezoelectric block, and the AF friction rod is in contact with one side of the AF carrier and can drive the AF carrier to move along a first direction.

[0015] Optionally, the AF piezoelectric mechanism further includes an AF clamping plate and an AF spring with elastic effect. The inner sidewall of the AF clamping plate is detachably connected to the sidewall of the AF carrier. The outer inner wall of the AF clamping plate abuts against the outer side of the AF friction rod. The AF spring is disposed between the sidewall of the AF carrier and the AF friction rod. The AF clamping plate and the AF spring tightly abut against and connect the AF friction rod and the AF carrier, so that after the AF piezoelectric block is energized, the AF friction rod drives the AF carrier to move along the first direction.

[0016] Optionally, the AF piezoelectric mechanism further includes an AF counterweight block, which is connected to the AF piezoelectric block. The AF counterweight block and the AF piezoelectric block are installed in an AF piezoelectric mechanism mounting groove on one side of the base, and the AF friction rod extends into the base and is disposed on one side of the AF carrier.

[0017] Optionally, the AF counterweight is fixed to the base by an AF mounting plate.

[0018] Optionally, the lens driving device further includes a circuit board disposed on the outside of the base, the circuit board being connected to and supplying power to the AF piezoelectric block.

[0019] Optionally, the circuit board is an FPC board.

[0020] Optionally, an AF sensing magnet is provided on the other side of the upper end of the AF carrier, an AF position sensor is provided on the circuit board, the AF position sensor is disposed opposite to the AF sensing magnet, and an AF clearance hole is provided on the base between the AF position sensor and the AF sensing magnet.

[0021] Optionally, the lens driving device further includes a prism guide rod, which is disposed on the other side of the base. The two ends of the prism guide rod along the first direction are respectively fixed on the base. A prism carrier guide groove is provided on the other side of the prism carrier. The prism guide rod passes through the prism carrier guide groove along the first direction. When the prism driving mechanism drives one side of the prism carrier to move along the first direction, the other side of the prism carrier moves on the prism guide rod through the prism carrier guide groove.

[0022] Optionally, the prism driving mechanism adopts the same structure as the AF driving mechanism, that is: the prism driving mechanism adopts a prism piezoelectric mechanism, the prism piezoelectric mechanism is disposed on one side of the prism carrier and drives the prism carrier to move along the first direction.

[0023] Optionally, the prism piezoelectric mechanism includes a prism piezoelectric block and a prism friction rod. The prism piezoelectric block is disposed on one side of the base. One end of the prism friction rod is connected to the prism piezoelectric block. The prism friction rod is in contact with one side of the prism carrier and can drive the prism carrier to move along a first direction.

[0024] Optionally, the prism piezoelectric mechanism further includes a prism clamp and a prism spring with elastic properties. The inner sidewall of the prism clamp is detachably connected to the sidewall of the prism carrier. The outer inner wall of the prism clamp abuts against the outer side of the prism friction rod. The prism spring is disposed between the sidewall of the prism carrier and the prism friction rod. The prism clamp and the prism spring tightly abut against the prism carrier, so that after the prism piezoelectric block is energized, the prism friction rod drives the prism carrier to move along the first direction.

[0025] Optionally, the prism piezoelectric mechanism further includes a prism counterweight, which is connected to the prism piezoelectric block. The prism counterweight and the prism piezoelectric block are installed in a prism piezoelectric mechanism mounting groove on one side of the base, and the prism friction rod extends into the base and is disposed on one side of the prism carrier.

[0026] Optionally, the prism counterweight is fixed to the base by a prism mounting plate.

[0027] Optionally, the lens driving device further includes a circuit board disposed on the outside of the base, the circuit board being connected to and supplying power to the prism piezoelectric block.

[0028] Optionally, a prism sensing magnet is provided on the other side of the upper end of the prism carrier, a prism position sensor is provided on the circuit board, the prism position sensor is disposed opposite to the prism sensing magnet, and a prism clearance hole is provided on the base between the prism position sensor and the prism sensing magnet.

[0029] Optionally, the masking drive mechanism adopts the same structure as the AF drive mechanism, that is: the masking drive mechanism adopts a masking piezoelectric mechanism, the masking piezoelectric mechanism is disposed on one side of the masking and drives the masking to move along the first direction.

[0030] Optionally, the shielding piezoelectric mechanism includes a shielding piezoelectric block and a shielding friction rod. The shielding piezoelectric block is disposed on the other side of the base. One end of the shielding friction rod is connected to the shielding piezoelectric block. The shielding friction rod is in contact with one side of the shield and can drive the shield to move along a first direction.

[0031] Optionally, the piezoelectric mechanism of the shield further includes a shield clamp and a shield spring with elastic effect. The inner side wall of the shield clamp is detachably connected to the side wall of the shield. The outer inner wall of the shield clamp abuts against the outer side of the shield friction rod. The shield spring is disposed between the side wall of the shield and the shield friction rod. The shield clamp and the shield spring tightly abut against the shield and the shield, so that after the shield piezoelectric block is energized, the shield friction rod drives the shield to move along the first direction.

[0032] Optionally, the shield piezoelectric mechanism further includes a shield counterweight block, the shield counterweight block is connected to the shield piezoelectric block, the shield counterweight block and the shield piezoelectric block are installed in the shield piezoelectric mechanism mounting groove on the other side of the base, and the shield friction rod extends into the base and is disposed on one side of the shield.

[0033] Optionally, the shield counterweight is fixed to the base by a shield mounting iron plate.

[0034] Optionally, the lens driving device further includes a circuit board disposed on the outside of the base, the circuit board being connected to and supplying power to the masking piezoelectric block.

[0035] Optionally, the masking drive mechanism is a linkage drive mechanism, which connects the masking plate and the prism carrier. When the prism carrier moves forward in the first direction through the prism drive mechanism, the linkage drive mechanism drives the masking plate to move backward. When the prism carrier moves backward in the first direction through the prism drive mechanism, the linkage drive mechanism drives the masking plate to move forward.

[0036] Optionally, the linkage drive mechanism includes two linkages arranged side by side. The bottom end of each linkage is connected to a positioning shaft pin located on one side of the prism carrier, and the top end of each linkage is connected to a cover plate mounting shaft pin located on one side of the cover plate. The middle part of any one linkage is connected to a central shaft pin located on one side of the base. The two linkages, the two cover plate mounting shafts, and the two positioning shafts combine to form a near-parallelogram structure. When the prism drive mechanism drives the prism carrier to move back and forth, the two positioning shafts move back and forth, and the two linkages rotate around the central shaft, thereby driving the two cover plate mounting shafts and the cover plate to move horizontally in the opposite direction to the prism carrier.

[0037] Optionally, a shield sensing magnet is provided on one side of the shield, a shield position sensor is provided on the circuit board, the shield position sensor is disposed opposite to the shield sensing magnet, and a sensing avoidance hole is provided on the base between the shield position sensor and the shield sensing magnet.

[0038] Beneficial effects: This utility model has at least one or more of the following advantages:

[0039] 1. The AF carrier of this utility model can move back and forth within the base under the action of the AF drive mechanism. The first lens is mounted on the AF carrier to realize the moving zoom operation. The second lens is mounted on the base and located behind the AF carrier. It will not move. The first lens and the second lens work together to realize the dual-lens focusing operation.

[0040] 2. The prism carrier of this utility model can not only perform nodding and shaking movements to achieve the effect of adjusting the turning angle of light, but also move back and forth in the base under the action of the prism driving mechanism, so that the distance between the prism carrier and the second lens is different, and the focus adjustment operation is achieved by the back and forth movement of the prism carrier.

[0041] 3. The outer shell of this utility model is provided with two light-entry holes, one at the front and one at the back. Through the coordinated action of a movable cover plate and a prism carrier, when the prism is located below one of the light-entry holes, the cover plate is located below the other light-entry hole. In other words, the cover plate will block the light-entry hole that is not in use. When the prism carrier is located below different light-entry holes, the distance between it and the second lens is different. By setting two light-entry holes, the prism carrier can be moved back and forth, and the focus adjustment operation can be achieved by moving back and forth. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of a structure according to Embodiment 1 of the present utility model;

[0043] Figure 2 for Figure 1 An exploded view;

[0044] Figure 3 for Figure 2 A partial structural diagram;

[0045] Figure 4 This is a diagram showing the positional relationship between the AF component and the prism component in Example 1;

[0046] Figure 5 for Figure 4 Another angle of the exploded view;

[0047] Figure 6 This is an exploded view of the AF component in Example 1;

[0048] Figure 7 for Figure 6 Further exploded view;

[0049] Figure 8 This is a diagram showing the connection relationship between the AF piezoelectric mechanism and the AF carrier in Example 1;

[0050] Figure 9 This is an exploded view of one structure of the prism assembly in Example 1;

[0051] Figure 10 for Figure 9 Further exploded view;

[0052] Figure 11 The diagram shows the connection relationship between the prism piezoelectric mechanism and the prism carrier, and the connection relationship between the shielding piezoelectric mechanism and the shielding plate in Example 1.

[0053] Figure 12 for Figure 11 Another perspective illustration;

[0054] Figure 13 This is a schematic diagram of a prism carrier in Example 1;

[0055] Figure 14 for Figure 13 Partial structural diagram;

[0056] Figure 15 for Figure 14 Partial structural diagram;

[0057] Figure 16 for Figure 1 Top view;

[0058] Figure 17 for Figure 16 AA section view;

[0059] Figure 18 This is an exploded view of a structure according to Embodiment 2 of this utility model;

[0060] Figure 19 for Figure 18 Top view;

[0061] Figure 20 for Figure 19 BB section view;

[0062] Figure 21 This is an exploded view of one structure of the prism assembly in Example 2;

[0063] Figure 22 This is a connection diagram of the linkage drive mechanism in Example 2;

[0064] Figure 23 This is a diagram showing the positional relationship between the baffle and the baffle mounting shaft in Example 2;

[0065] Figure 24 This is an exploded view of one structure of the prism carrier in Example 2. Detailed Implementation

[0066] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, so as to better understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended to limit the scope of the present invention, but are only for illustrating the essential spirit of the technical solution of the present invention.

[0067] In the following description, certain specific details are set forth for the purpose of illustrating various disclosed embodiments in order to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the art will recognize that embodiments may be practiced without one or more of these specific details. In other instances, well-known apparatuses, structures, and techniques associated with this application may not have been shown or described in detail to avoid unnecessarily obscuring the description of the embodiments.

[0068] Throughout this specification, references to "an embodiment" or "an embodiment" indicate that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Therefore, the appearance of "in an embodiment" or "an embodiment" in various places throughout the specification does not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic may be combined in any manner in one or more embodiments.

[0069] In the following description, in order to clearly demonstrate the structure and working method of this utility model, a number of directional terms will be used. However, terms such as "front", "back", "left", "right", "outside", "inside", "outward", "inward", "up", and "down" should be understood as convenient terms and not as limiting terms.

[0070] In the following description, the first direction is defined as the direction along the optical axis of the zoom lens, the second direction is the direction perpendicular to the first direction and parallel to the lower surface of the base, and the third direction is the direction perpendicular to the first and second directions. That is, the third direction is the direction of the plumb line when the base is normally placed. In other words, if a coordinate system is established with the third direction as the Z-axis and the first direction as the X-axis, then the second direction is the Y-axis.

[0071] Example 1:

[0072] Reference Figures 1 to 17 This embodiment provides a lens driving device, which includes a base, an AF carrier 12, a prism carrier 22, an AF driving mechanism, and an image stabilization driving mechanism.

[0073] The base can adopt an integral structure. The AF carrier 12 and the prism carrier 22 are arranged in the base along the first direction. Specifically, the base can be provided with a prism carrier receiving cavity and a lens carrier receiving cavity along the first direction. The AF carrier 12 is used to install the zoom lens and is arranged in the lens carrier receiving cavity. The prism carrier 22 is used to install the prism and is arranged in the prism carrier receiving cavity.

[0074] The base can also adopt a split structure, consisting of an AF base 11 and a prism base 21, dividing the entire device into two relatively independent parts: the AF assembly and the prism assembly. The AF carrier 12 is disposed within the AF base 11 and can move along a first direction under the drive of the AF drive mechanism to achieve zoom functionality. The prism carrier is disposed within the prism base 21 and can rotate around the first direction and a second direction perpendicular to the first direction under the drive of the image stabilization drive mechanism to achieve optical image stabilization. The prism carrier 22 drives the prism to perform nodding and shaking movements. The prism can deflect the direction of passing light, and the prism carrier 22 can move the prism to change the direction of light illumination. The nodding movement refers to the rotation of the prism carrier 22 around the second direction, and the shaking movement refers to the rotation around the first direction.

[0075] Reference Figures 2 to 5 The AF assembly 10 includes an AF base 11, an AF carrier 12, and an AF drive mechanism 13. The AF carrier 12 has a first connecting portion 121 for mounting a first lens 91, and the AF base 11 has a second connecting portion 111 for mounting a second lens 92, located at the rear of the AF carrier 12. The AF drive mechanism 13 drives the AF carrier 12 to move along a first direction within the AF base 11, in front of the second connecting portion 111. The first lens 91, mounted on the AF carrier 12, enables zoom operation, while the second lens 92, mounted on the AF base 11 and located at the rear of the AF carrier 12, does not move. The first lens 91 and the second lens 92 cooperate to achieve dual-lens focusing operation.

[0076] In one embodiment, reference is made to Figures 2 to 5 The prism assembly 20 includes a prism base 21, a prism carrier 22, and a prism driving mechanism 23. The prism driving mechanism 23 drives the prism carrier 22 to move along a first direction within the prism base 21 on the rear side of the second connecting part 111. The prism carrier 22 can not only perform nodding and shaking movements to adjust the angle of light refraction, but also move back and forth within the prism base 21 under the action of the prism driving mechanism 23, resulting in different distances between the prism carrier 22 and the second lens 92. The back and forth movement of the prism carrier 22 further enables focus adjustment.

[0077] In one embodiment, reference is made to Figures 1 to 3 , Figure 16 The lens driving device also includes a housing 30, which is detachably connected to the AF base 11 and the prism base 21 to form a hollow cavity. The AF carrier 12, the prism carrier 22, the AF driving mechanism 13, the image stabilization driving mechanism and the prism driving mechanism 23 are all located in the hollow cavity. The housing 30 is provided with two light inlets 31 along the first direction, which can be selected according to the needs.

[0078] Reference Figures 2 to 5 The prism assembly 20 also includes a shield 24 and a shield driving mechanism 25. The shield 24 is located above the prism carrier 22, specifically above the prism 93. The shield driving mechanism 25 drives the shield 24 to move along a first direction above the prism carrier 22.

[0079] The prism carrier 22 is provided with a prism mounting part 221 for mounting the prism 93. When the prism driving mechanism 23 drives the prism mounting part 221 to be below one of the light inlets 31, the masking mechanism 25 drives the masking plate 24 to be below the other light inlet 31. Figure 17As shown, the shield 24 is located below the front light inlet 31, while the prism carrier 22 and the prism 93 on it are located below the rear light inlet 31. Figure 20 As shown, the shield 24 is located below the light inlet 31 on the rear side, while the prism carrier 22 and the prism 93 on it are located below the light inlet 31 on the front side.

[0080] In other words, the shield 24 will block the unused light inlet 31. When the prism carrier 22 is located under different light inlets 31, the distance between it and the second lens 92 is different. By setting two light inlets 31, the prism carrier 22 can be moved back and forth, and the focal length adjustment operation can be achieved by moving back and forth.

[0081] In one embodiment, reference is made to Figures 6 to 8 The AF assembly 10 also includes an AF guide rod 14, which is disposed on the other side of the AF base 11. The two ends of the AF guide rod 14 along the first direction are respectively fixed on the AF base 11. An AF guide groove 122 is provided on the other side of the AF carrier 12. The AF guide rod 14 passes through the AF guide groove 122 along the first direction. When the AF drive mechanism 13 drives one side of the AF carrier 12 to move along the first direction, the other side of the AF carrier 12 moves on the AF guide rod 14 through the AF guide groove 122.

[0082] In this embodiment, the AF drive mechanism 13 is set on one side of the AF carrier 12, and the AF guide rod 14 is set on the other side of the AF carrier 12. The movement and guidance operation of the AF carrier 12 is realized through the AF guide rod 14.

[0083] In one embodiment, reference is made to Figures 3 to 8 The AF drive mechanism 13 adopts an AF piezoelectric mechanism, which is located on one side of the AF carrier 12 and drives the AF carrier 12 to move along the first direction.

[0084] In one embodiment, reference is made to Figures 6 to 8 The AF piezoelectric mechanism includes an AF piezoelectric block 131 and an AF friction rod 132. The AF piezoelectric block 131 is disposed on one side of the AF base 11. One end of the AF friction rod 132 is connected to the AF piezoelectric block 131. The AF friction rod 132 is abutted and connected to one side of the AF carrier 12 and can drive the AF carrier 12 to move along the first direction.

[0085] When the AF piezoelectric block 131 is energized, it will deform and return to its original shape after the power is turned off. When the AF piezoelectric block 131 is energized and deformed, the AF friction rod 132 will stretch, thereby driving the AF carrier 12 to move along the first direction, realizing the zoom operation of the first lens 91 mounted on the AF carrier 12.

[0086] In one embodiment, reference is made to Figures 6 to 8The AF piezoelectric mechanism also includes an AF clamp 133 and an AF spring 134.

[0087] The AF clamp 133 is an elastic clamp with a resilient effect. The inner sidewall of the AF clamp 133 is detachably connected to the sidewall of the AF carrier 12, for example, by a snap-fit ​​connection. The outer inner wall of the AF clamp 133 abuts against the outer side of the AF friction rod 132, preferably the outer sidewall of the AF clamp 133 abuts against the outer side of the middle portion of the AF friction rod 132. Under the elastic action of the AF clamp 133, the AF friction rod 132 is pressed against the sidewall of the AF carrier 12.

[0088] Meanwhile, the AF spring 134 is disposed between the side wall of the AF carrier 12 and the AF friction rod 132. Preferably, the AF spring 134 abuts against the inner side of the middle part of the AF friction rod 132. The friction between the AF friction rod 132 and the AF carrier 12 is increased by the action of the AF spring 134 and the AF clamp 133. The AF friction rod 132 and the AF carrier 12 are tightly connected by the AF clamp 133 and the AF spring 134, so that after the AF piezoelectric block 131 is energized, the AF friction rod 132 drives the AF carrier 12 to move along the first direction.

[0089] In a preferred embodiment, the AF carrier 12 has an outwardly opening V-shaped groove on one side wall, and the AF spring 134 is disposed within the V-shaped groove. The AF spring 134 is preferably a V-shaped spring, such that its inner surface fits the V-shaped groove and its outer surface fits the inner surface of the AF friction rod 132. The AF base 11 on both sides of the V-shaped groove has AF friction rod clearance holes, into which the AF friction rod 132 is inserted and can extend along a first direction. An AF clamp mounting hole is provided above the V-shaped groove, and the inner side wall of the AF clamp 133 is detachably connected to the AF clamp mounting hole.

[0090] In one embodiment, the AF clamp 133 is a quasi-inverted V-shaped clamp or a quasi-inverted U-shaped clamp.

[0091] In one embodiment, reference is made to Figures 6 to 8 The AF piezoelectric mechanism also includes an AF counterweight 135, which is connected to an AF piezoelectric block 131. The AF counterweight 135 and the AF piezoelectric block 131 are installed in the AF piezoelectric mechanism mounting groove 112 on one side of the AF base 11. The AF friction rod 132 extends into the AF base 11 and is set on one side of the AF carrier 12.

[0092] In one embodiment, reference is made to Figures 6 to 8 The AF piezoelectric mechanism also includes an AF mounting plate 136, and the AF counterweight 135 is fixed to the AF base 11 by the AF mounting plate 136.

[0093] In one embodiment, reference is made to Figures 2 to 4The lens drive device also includes a circuit board 40, which is disposed outside the AF base 11 and the prism base 21. The circuit board 40 supplies power to the various drive mechanisms in the lens drive device. Specifically, the circuit board 40 connects to and supplies power to the AF piezoelectric block 131. When the circuit board 40 supplies power to the AF piezoelectric block 131, the AF piezoelectric block 131 is energized and deformed, and the AF friction rod 132 drives the AF carrier 12 to move along the first direction.

[0094] In one embodiment, the circuit board 40 is an FPC board.

[0095] In one embodiment, reference is made to Figure 6 and Figure 7 An AF sensing magnet 123 is provided on the other side of the upper end of the AF carrier 12. An AF position sensor is provided on the circuit board 40. The AF position sensor and the AF sensing magnet 123 are arranged opposite to each other. An AF clearance hole 113 is provided on the AF base 11 between the AF position sensor and the AF sensing magnet 123. The AF clearance hole 113 is used to allow clearance between the AF position sensor and the AF sensing magnet 123, so that the AF position sensor and the AF sensing magnet 123 are arranged opposite each other without obstruction. The two work together to realize the monitoring of the movement position of the AF carrier 12.

[0096] In one embodiment, reference is made to Figures 9 to 12 The prism assembly 20 also includes a prism guide rod 26, which is disposed on the other side of the prism base 21. The two ends of the prism guide rod 26 along the first direction are respectively fixed on the prism base 21. A prism carrier guide groove 222 is provided on the other side of the prism carrier 22. The prism guide rod 26 passes through the prism carrier guide groove 222 along the first direction. When the prism driving mechanism 23 drives one side of the prism carrier 22 to move along the first direction, the other side of the prism carrier 22 moves on the prism guide rod 26 through the prism carrier guide groove 222.

[0097] In this embodiment, the prism driving mechanism 23 is set on one side of the prism carrier 22, and the prism guide rod 26 is set on the other side of the prism carrier 22. The movement and guidance operation of the prism carrier 22 is realized through the prism guide rod 26.

[0098] In one embodiment, reference is made to Figures 3 to 5 , Figures 9 to 12 The prism driving mechanism 23 adopts the same structure as the AF driving mechanism 13. When the AF driving mechanism 13 adopts an AF piezoelectric mechanism, the prism driving mechanism 23 adopts a prism piezoelectric mechanism with the same structure as the AF piezoelectric mechanism provided in the above embodiments of this utility model. The prism piezoelectric mechanism is disposed on one side of the prism carrier 22 and drives the prism carrier 22 to move along the first direction.

[0099] In specific implementation, unlike the AF piezoelectric mechanism provided in the above embodiments of this utility model, the counterweight and piezoelectric block are installed in the prism piezoelectric mechanism mounting groove on the prism base 21, and its friction rod extends into the prism base 21 and is connected to the prism carrier 22. The connection structure between it and the prism carrier 22 is the same as the connection structure of the AF piezoelectric mechanism.

[0100] In one embodiment, reference is made to Figures 9 to 12 The prism piezoelectric mechanism includes a prism piezoelectric block 231 and a prism friction rod 232. The prism piezoelectric block 231 is disposed on one side of the prism base 21. One end of the prism friction rod 232 is connected to the prism piezoelectric block 231. The prism friction rod 232 is in contact with one side of the prism carrier 22 and can drive the prism carrier 22 to move along the first direction, so that the distance between the prism 93 installed on the prism carrier 22 and the second lens 92 is different.

[0101] In one embodiment, reference is made to Figures 9 to 12 The prism piezoelectric mechanism also includes a prism clamp 233 and a prism spring 234.

[0102] The prism clamp 233 is an elastic clamp with a resilient effect. The inner sidewall of the prism clamp 233 is detachably connected to the sidewall of the prism carrier 22, for example, by a snap-fit ​​connection. The outer inner wall of the prism clamp 233 abuts against the outer side of the prism friction rod 232, preferably the outer inner wall of the outer side of the middle of the prism friction rod 232. Under the elastic action of the prism clamp 233, the prism friction rod 232 is pressed against the sidewall of the prism carrier 22.

[0103] Meanwhile, the prism spring 234 is disposed between the side wall of the prism carrier 22 and the prism friction rod 232. Preferably, the prism spring 234 abuts against the inner side of the middle part of the prism friction rod 232. The friction between the prism friction rod 232 and the prism carrier 22 is increased by the action of the prism spring 234 and the prism clamp 233. The prism friction rod 232 and the prism carrier 22 are tightly connected by the prism clamp 233 and the prism spring 234, so that after the prism piezoelectric block 231 is energized, the prism friction rod 232 drives the prism carrier 22 to move along the first direction.

[0104] In a preferred embodiment, a V-shaped groove with an outward opening is provided on one side wall of the prism carrier 22, and a prism spring 234 is disposed within the V-shaped groove. The prism spring 234 is preferably a V-shaped spring, such that its inner surface conforms to the V-shaped groove and its outer surface conforms to the inner surface of the prism friction rod 232. Prism bases 21 on both sides of the V-shaped groove are provided with prism friction rod clearance holes. The prism friction rod 232 is inserted into the prism friction rod clearance holes and can extend along a first direction within the prism friction rod clearance holes. A prism clamp mounting hole is provided above the V-shaped groove, and the inner side wall of the prism clamp 233 is detachably connected to the prism clamp mounting hole.

[0105] In one embodiment, the prism clamp 233 is a quasi-inverted V-shaped clamp or a quasi-inverted U-shaped clamp.

[0106] In one embodiment, reference is made to Figures 9 to 12 The prism piezoelectric mechanism also includes a prism counterweight 235, which is connected to a prism piezoelectric block 231. The prism counterweight 235 and the prism piezoelectric block 231 are installed in a prism piezoelectric mechanism mounting groove 211 on one side of the prism base 21. The prism friction rod 232 extends into the prism base 21 and is located on one side of the prism carrier 22.

[0107] In one embodiment, reference is made to Figures 2 to 4 The lens drive device also includes a circuit board 40, which is disposed on the outside of the AF base 11 and the prism base 21. The circuit board 40 is connected to the prism piezoelectric block 231 and supplies power to the prism piezoelectric block 231.

[0108] In one embodiment, reference is made to Figures 10 to 11 A prism sensing magnet 223 is disposed on the other side of the upper end of the prism carrier 22. A prism position sensor is disposed on the circuit board 40. The prism position sensor and the prism sensing magnet 223 are disposed opposite to each other. A prism clearance hole 212 is disposed on the prism base 21 between the prism position sensor and the prism sensing magnet 223. The prism clearance hole 212 is used to allow clearance between the prism position sensor and the prism sensing magnet 223, so that the prism position sensor and the prism sensing magnet 223 are disposed opposite to each other without obstruction. The two work together to realize the monitoring of the movement position of the prism carrier 22.

[0109] In one embodiment, reference is made to Figures 3 to 5 , Figures 9 to 12 The masking drive mechanism 25 adopts the same structure as the AF drive mechanism 13. When the AF drive mechanism 13 adopts the AF piezoelectric mechanism, the masking drive mechanism 25 adopts the same structure as the AF piezoelectric mechanism provided in the above embodiments of this utility model. The masking piezoelectric mechanism is disposed on one side of the masking plate 24 and drives the masking plate 24 to move along the first direction.

[0110] In specific implementation, unlike the AF piezoelectric mechanism provided in the above embodiments of this utility model, the counterweight and piezoelectric block are fixedly installed in the mounting groove of the shield piezoelectric mechanism on the prism base 21. Its friction rod extends into the prism base 21 and is connected to one side of the shield. The connection structure between it and the shield is the same as the connection structure of the AF piezoelectric mechanism. When the prism driving mechanism 23 moves the prism carrier 22 to below the front light inlet, the shield driving mechanism 25 moves the shield 24 to below the rear light inlet and blocks the rear light inlet, so as to avoid the situation where the light from the two light inlets interfere with each other.

[0111] In one embodiment, reference is made to Figures 9 to 12 The shielding piezoelectric mechanism includes a shielding piezoelectric block 251 and a shielding friction rod 252. The shielding piezoelectric block 251 is disposed on the other side of the prism base 21. One end of the shielding friction rod 252 is connected to the shielding piezoelectric block 251. The shielding friction rod 252 is in contact with one side of the shielding plate 24 and can drive the shielding plate 24 to move along the first direction.

[0112] In one embodiment, reference is made to Figures 9 to 12 The piezoelectric mechanism of the shield also includes a shield clamp 253 and a shield spring 254.

[0113] The baffle clamp 253 is an elastic clamp with a resilient effect. The inner sidewall of the baffle clamp 253 is detachably connected to the sidewall of the baffle 24, for example, by a snap-fit ​​connection. The outer inner wall of the baffle clamp 253 abuts against the outer side of the baffle friction rod 252, preferably the outer middle part of the baffle friction rod 252. Under the elastic action of the baffle clamp 253, the prism friction rod 232 is pressed against the sidewall of the baffle 24.

[0114] Meanwhile, the baffle spring 254 is disposed between the side wall of the baffle 24 and the baffle friction rod 252. Preferably, the baffle spring 254 abuts against the inner side of the middle part of the baffle friction rod 252. The baffle spring 254 and the baffle clamp 253 increase the friction between the baffle friction rod 252 and the baffle 24. The baffle clamp 253 and the baffle spring 254 tightly abut against and connect the baffle friction rod 252 and the baffle 24, so that after the baffle piezoelectric block 251 is energized, the baffle friction rod 252 drives the baffle 24 to move in the first direction.

[0115] In a preferred embodiment, a V-shaped groove with an outward opening is provided on one side wall of the shield 24, and the shield spring 254 is disposed within the V-shaped groove. The shield spring 254 is preferably a V-shaped spring, so that its inner side fits against the V-shaped groove and its outer side fits against the inner side of the shield friction rod 252. Mirror bases 21 on both sides of the V-shaped groove are provided with shield friction rod clearance holes, and the shield friction rod 252 is inserted into the shield friction rod clearance holes and can extend along a first direction within the shield friction rod clearance holes. A shield clamp mounting hole is provided above the V-shaped groove, and the inner side wall of the shield clamp 253 is detachably connected to the shield clamp mounting hole.

[0116] In one embodiment, the baffle clamp 253 is a quasi-inverted V-shaped clamp or a quasi-inverted U-shaped clamp.

[0117] In one embodiment, reference is made to Figures 9 to 12The shielding piezoelectric mechanism also includes a shielding counterweight 255, which is connected to a shielding piezoelectric block 251. The shielding counterweight 255 and the shielding piezoelectric block 251 are installed in the shielding piezoelectric mechanism mounting groove 241 on the other side of the prism base 21. The shielding friction rod 252 extends into the prism base 21 and is located on one side of the shielding 24.

[0118] In one embodiment, reference is made to Figures 2 to 4 The lens drive device also includes a circuit board 40, which is disposed on the outside of the AF base 11 and the prism base 21. The circuit board 40 is connected to the masking piezoelectric block 251 and supplies power to the masking piezoelectric block 251.

[0119] In Embodiment 1 of this utility model, the prism carrier 22 mainly realizes the back-and-forth movement to cooperate with different light inlet holes 31 to realize the focal length adjustment operation; in this design, the prism carrier 22 can simultaneously perform nodding and shaking movements to achieve the effect of adjusting the turning angle of light; it can be an integral nodding and shaking structure or a split nodding and shaking structure, and the drive can also use magnets and coils in different positions to cooperate to perform nodding and shaking movements, without structural limitations.

[0120] For example, in one example, referencing Figures 13 to 15 An embodiment of a split prism carrier structure is provided, wherein the prism carrier 22 includes a first prism carrier 22a and a second prism carrier 22b.

[0121] The bottom end of the first prism carrier 22a is provided with a cross shaft mounting groove 2241 and a cross shaft 224 is installed thereon. The first prism carrier 22a is supported on the second prism carrier 22b with the cross shaft 224 as the fulcrum. The bottom end of the first prism carrier 22a is provided with an adsorption magnet mounting groove 2251. The adsorption magnet mounting groove 2251 is installed inside the adsorption magnet mounting groove 2251. The magnetic attraction generated by the adsorption magnet 225 and the second adsorption magnet 226 set on the second prism carrier 22b can achieve a stable connection between the first prism carrier 22a, the cross shaft 224, and the second prism carrier 22b. At the same time, a magnet and coil cooperation structure can be set at the bottom, sides, or rear of the first prism carrier 22a to make the first prism carrier 22a nod or shake around the cross shaft 224.

[0122] Example 2:

[0123] Reference Figures 18 to 24 This embodiment provides a lens driving device, which has the following structural differences compared to Embodiment 1. The remaining structures are the same as those in Embodiment 1 and will not be described again here.

[0124] In one embodiment, reference is made to Figure 21The prism piezoelectric mechanism also includes a prism mounting plate 236, and the prism counterweight 235 is fixed to the prism base 21 by the prism mounting plate 236.

[0125] When the masking drive mechanism uses a masking piezoelectric motor, the masking piezoelectric mechanism also includes a masking mounting iron plate, and the masking counterweight 255 is fixed to the prism base 21 by the masking mounting iron plate.

[0126] In one embodiment, the masking drive mechanism 25 does not use the masking piezoelectric mechanism of Embodiment 1. That is, the masking piezoelectric mechanism is omitted in this embodiment. The masking drive mechanism 25 uses a linkage drive mechanism to connect the masking plate 24 and the prism carrier 22. When the prism carrier 22 moves forward in the first direction through the prism drive mechanism 23, the linkage drive mechanism drives the masking plate 24 to move backward. When the prism carrier 22 moves backward in the first direction through the prism drive mechanism 23, the linkage drive mechanism drives the masking plate 24 to move forward, so as to achieve the effect of the masking plate 24 misaligning and blocking the light-entry hole 31.

[0127] In one embodiment, reference is made to Figures 21 to 23 The linkage drive mechanism includes two linkages 271 arranged side by side. The bottom end of one linkage 271 is connected to a positioning shaft 272 pin located on one side of the prism carrier 22. In other words, two positioning shafts 272 are located on one side of the prism carrier 22, and each positioning shaft 272 is connected to the bottom pin of its corresponding linkage 271. The top end of the linkage 271 is connected to a cover mounting shaft 273 pin located on one side of the cover plate 24. In other words, two cover mounting shafts 273 are located on one side of the cover plate 24, and each cover mounting shaft 273 is connected to the top pin of its corresponding linkage 271. The middle of any linkage 271 is connected to a central shaft 274 pin located on one side of the prism base 21. In a specific implementation, a central shaft mounting hole 214 can be provided on one side of the prism base 21, and the outer end of the central shaft 274 is fixedly installed within the central shaft mounting hole 214.

[0128] In the linkage drive mechanism, two linkages 271, two baffle mounting shafts 273, and two positioning shafts 272 combine to form a parallelogram-like structure. When the prism drive mechanism 23 drives the prism carrier 22 to move back and forth, the two positioning shafts 272 move back and forth, and the two linkages 271 rotate around the central axis 274, thereby driving the two baffle mounting shafts 273 and the baffle 24 to move horizontally in the opposite direction to the prism carrier 22, thus achieving the technical effect of misalignment and blocking between the baffle 24 and the prism carrier 22 and the prism 93 on it.

[0129] In one embodiment, reference is made to Figure 21 and Figure 22A shield sensing magnet 242 is provided on one side of the shield 24, and a shield position sensor is provided on the circuit board 40. The shield position sensor is positioned opposite to the shield sensing magnet 242, and a sensing clearance hole 213 is provided on the prism base 21 between the shield position sensor and the shield sensing magnet 242.

[0130] By using the masking position sensor in conjunction with the masking sensing magnet 242, the movement position of the masking 24 can be monitored. In this case, the prism sensing magnet 223 can be omitted on the prism carrier 22, and the prism position sensor can be omitted on the circuit board 40. Instead, the movement position of the prism carrier 22 can be monitored based on the movement position of the masking 24.

[0131] In one embodiment, reference is made to Figure 24 In the split prism carrier structure, the second prism carrier 22b is provided with a mounting boss 227 to support the cross shaft 224, and the first prism carrier 22a is provided with a relief groove 228 corresponding to the mounting boss 227. When the first prism carrier 22a is installed on the second prism carrier 22b, the mounting boss 227 is located in the relief groove 228, and the two ends of the cross shaft 224 in the second direction are located on the mounting boss 227.

[0132] The preferred embodiments of this utility model have been described in detail above. However, it should be understood that after reading the above teachings, those skilled in the art can make various alterations or modifications to this utility model. These equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A lens driving device, the lens driving device comprising a base, an AF carrier and a prism carrier, the AF carrier being movable within the base along a first direction, and the prism carrier being rotatable within the base about the first direction and a second direction perpendicular to the first direction; Its features are, The AF carrier is provided with a first connecting part for mounting a first lens, and the base is provided with a second connecting part for mounting a second lens. The second connecting part is located on the rear side of the AF carrier. The lens driving device also includes an AF driving mechanism, which drives the AF carrier to move along a first direction in front of the second connecting part.

2. The lens driving device as described in claim 1, characterized in that, The lens driving device further includes a prism driving mechanism, which drives the prism carrier to move along a first direction behind the second connecting part.

3. The lens driving device as described in claim 2, characterized in that, The lens driving device also includes a housing, which is connected to the base to form a hollow cavity. The AF carrier, the prism carrier, the AF driving mechanism and the prism driving mechanism are all located in the hollow cavity. The housing has two light-entry holes along the first direction. The lens driving device further includes a mask and a mask driving mechanism located in the hollow cavity. The mask is located above the prism carrier, and the mask driving mechanism drives the mask to move along a first direction above the prism carrier. The prism carrier is provided with a prism mounting part. When the prism driving mechanism drives the prism mounting part to be located below one of the light inlets, the mask driving mechanism drives the mask to be located below the other light inlet.

4. The lens driving device as described in claim 1, characterized in that, The lens driving device also includes an AF guide rod, which is disposed on the other side of the base. The two ends of the AF guide rod along the first direction are respectively fixed on the base. An AF guide groove is provided on the other side of the AF carrier. The AF guide rod passes through the AF guide groove along the first direction. When the AF driving mechanism drives one side of the AF carrier to move along the first direction, the other side of the AF carrier moves on the AF guide rod through the AF guide groove.

5. The lens driving device according to any one of claims 1 to 4, characterized in that, The AF drive mechanism adopts an AF piezoelectric mechanism, which is disposed on one side of the AF carrier and drives the AF carrier to move along a first direction.

6. The lens driving device as described in claim 5, characterized in that, The AF piezoelectric mechanism includes an AF piezoelectric block and an AF friction rod. The AF piezoelectric block is disposed on one side of the base. One end of the AF friction rod is connected to the AF piezoelectric block. The AF friction rod is in contact with one side of the AF carrier and can drive the AF carrier to move along a first direction.

7. The lens driving device as described in claim 6, characterized in that, The AF piezoelectric mechanism further includes an AF clamping plate and an AF spring with elastic effect. The inner side wall of the AF clamping plate is detachably connected to the side wall of the AF carrier. The outer inner wall of the AF clamping plate abuts against the outer side of the AF friction rod. The AF spring is disposed between the side wall of the AF carrier and the AF friction rod. The AF clamping plate and the AF spring tightly abut against the AF carrier, so that after the AF piezoelectric block is energized, the AF friction rod drives the AF carrier to move along the first direction.

8. The lens driving device as described in claim 6, characterized in that, The AF piezoelectric mechanism also includes an AF counterweight block, which is connected to the AF piezoelectric block. The AF counterweight block and the AF piezoelectric block are installed in the AF piezoelectric mechanism mounting groove on one side of the base. The AF friction rod extends into the base and is disposed on one side of the AF carrier.

9. The lens driving device as described in claim 8, characterized in that, The AF counterweight is fixed to the base by an AF mounting plate.

10. The lens driving device as claimed in claim 6, characterized in that, The lens driving device also includes a circuit board disposed on the outside of the base, the circuit board being connected to and supplying power to the AF piezoelectric block.

11. The lens driving device as claimed in claim 10, characterized in that, The circuit board is an FPC board.

12. The lens driving device as claimed in claim 10, characterized in that, An AF sensing magnet is provided on the other side of the upper end of the AF carrier, and an AF position sensor is provided on the circuit board. The AF position sensor is arranged opposite to the AF sensing magnet, and an AF clearance hole is provided on the base between the AF position sensor and the AF sensing magnet.

13. The lens driving device as claimed in claim 2, characterized in that, The lens driving device also includes a prism guide rod, which is disposed on the other side of the base. The two ends of the prism guide rod along the first direction are respectively fixed on the base. A prism carrier guide groove is provided on the other side of the prism carrier. The prism guide rod passes through the prism carrier guide groove along the first direction. When the prism driving mechanism drives one side of the prism carrier to move along the first direction, the other side of the prism carrier moves on the prism guide rod through the prism carrier guide groove.

14. The lens driving device as described in claim 2 or 13, characterized in that, The prism driving mechanism adopts a prism piezoelectric mechanism, which is disposed on one side of the prism carrier and drives the prism carrier to move along a first direction.

15. The lens driving device as claimed in claim 14, characterized in that, The prism piezoelectric mechanism includes a prism piezoelectric block and a prism friction rod. The prism piezoelectric block is disposed on one side of the base. One end of the prism friction rod is connected to the prism piezoelectric block. The prism friction rod is in contact with one side of the prism carrier and can drive the prism carrier to move along a first direction.

16. The lens driving device as claimed in claim 15, characterized in that, The prism piezoelectric mechanism further includes a prism clamp and a prism spring with elastic properties. The inner sidewall of the prism clamp is detachably connected to the sidewall of the prism carrier. The outer inner wall of the prism clamp abuts against the outer side of the prism friction rod. The prism spring is disposed between the sidewall of the prism carrier and the prism friction rod. The prism clamp and the prism spring tightly abut against the prism carrier, so that after the prism piezoelectric block is energized, the prism friction rod drives the prism carrier to move along the first direction.

17. The lens driving device as claimed in claim 15, characterized in that, The prism piezoelectric mechanism also includes a prism counterweight, which is connected to the prism piezoelectric block. The prism counterweight and the prism piezoelectric block are installed in a prism piezoelectric mechanism mounting groove on one side of the base. The prism friction rod extends into the base and is located on one side of the prism carrier.

18. The lens driving device as claimed in claim 17, characterized in that, The prism counterweight is fixed to the base by a prism mounting plate.

19. The lens driving device as claimed in claim 15, characterized in that, The lens driving device also includes a circuit board disposed on the outside of the base, the circuit board being connected to and supplying power to the prism piezoelectric block.

20. The lens driving device as claimed in claim 19, characterized in that, A prism sensing magnet is provided on the other side of the upper end of the prism carrier, and a prism position sensor is provided on the circuit board. The prism position sensor is arranged opposite to the prism sensing magnet, and a prism clearance hole is provided on the base between the prism position sensor and the prism sensing magnet.

21. The lens driving device as claimed in claim 3, characterized in that, The masking drive mechanism adopts a masking piezoelectric mechanism, which is disposed on one side of the masking plate and drives the masking plate to move along a first direction.

22. The lens driving device as claimed in claim 21, characterized in that, The shielding piezoelectric mechanism includes a shielding piezoelectric block and a shielding friction rod. The shielding piezoelectric block is disposed on the other side of the base. One end of the shielding friction rod is connected to the shielding piezoelectric block. The shielding friction rod is in contact with one side of the shielding and can drive the shielding to move along a first direction.

23. The lens driving device as claimed in claim 22, characterized in that, The piezoelectric mechanism of the shield also includes a shield clamp and a shield spring with elastic effect. The inner side wall of the shield clamp is detachably connected to the side wall of the shield. The outer inner wall of the shield clamp abuts against the outer side of the shield friction rod. The shield spring is disposed between the side wall of the shield and the shield friction rod. The shield clamp and the shield spring tightly abut against the shield friction rod and the shield, so that after the shield piezoelectric block is energized, the shield friction rod drives the shield to move along the first direction.

24. The lens driving device as claimed in claim 22, characterized in that, The shield piezoelectric mechanism further includes a shield counterweight block, which is connected to the shield piezoelectric block. The shield counterweight block and the shield piezoelectric block are installed in the shield piezoelectric mechanism mounting groove on the other side of the base. The shield friction rod extends into the base and is disposed on one side of the shield.

25. The lens driving device as claimed in claim 24, characterized in that, The counterweight of the cover plate is fixed to the base by a clip-on mechanism.

26. The lens driving device as claimed in claim 22, characterized in that, The lens driving device also includes a circuit board disposed on the outside of the base, the circuit board being connected to and supplying power to the masking piezoelectric block.

27. The lens driving device as claimed in claim 3, characterized in that, The masking plate driving mechanism adopts a linkage driving mechanism, which connects the masking plate and the prism carrier. When the prism carrier moves forward in the first direction through the prism driving mechanism, the linkage driving mechanism drives the masking plate to move backward. When the prism carrier moves backward in the first direction through the prism driving mechanism, the linkage driving mechanism drives the masking plate to move forward.

28. The lens driving device as claimed in claim 27, characterized in that, The linkage drive mechanism includes two linkages arranged side by side. The bottom end of each linkage is connected to a positioning shaft pin located on one side of the prism carrier, and the top end of each linkage is connected to a cover plate mounting shaft pin located on one side of the cover plate. The middle part of any one linkage is connected to a central shaft pin located on one side of the base. The two linkages, the two cover plate mounting shafts, and the two positioning shafts combine to form a near-parallelogram structure. When the prism drive mechanism drives the prism carrier to move back and forth, the two positioning shafts move back and forth, and the two linkages rotate around the central shaft, thereby driving the two cover plate mounting shafts and the cover plate to move horizontally in the opposite direction to the prism carrier.

29. The lens driving device as claimed in claim 27, characterized in that, A shutter sensing magnet is provided on one side of the shutter. The lens driving device also includes a circuit board, which is disposed on the outside of the base. A mask position sensor is disposed on the circuit board, and the mask position sensor is disposed opposite to the mask sensing magnet. A sensing avoidance hole is disposed on the base between the mask position sensor and the mask sensing magnet.

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