Driving distance compensation device, optical zoom assembly, and image pickup apparatus

Abstract

The utility model discloses a kind of driving distance compensation device, optical zoom assembly and camera equipment, it is related to optical equipment technical field, wherein, driving distance compensation device includes driving structure and correction structure, driving structure includes step motor and ball screw, ball screw is set along the first direction extension, step motor is driven connection with the screw rod of ball screw, to drive screw rod rotation around the axis of first direction extension, ball nut of ball screw is set along the first direction activity, and for driving connection to be driven component, correction structure includes angle sensor and magnet, one of angle sensor and magnet is located screw rod, another fixed setting, to can occur relative rotation, angle sensor is used to detect the angle of magnet relative rotation, magnet has at least one magnetic pole group, two magnetic poles in magnetic pole group are set apart around the axis of first direction extension. So set, can solve the problem of step loss, improve the driving precision and driving speed of step motor.

Description

Technical Field

[0001] This utility model relates to the field of optical equipment technology, and in particular to a drive distance compensation device, an optical zoom component, and a camera device. Background Technology

[0002] In a typical stepper motor and lead screw structure, a drive pulse is given to the motor, causing it to rotate at an angle and move the load on the lead screw a certain distance in a straight line. However, it is unknown whether the load has reached the designated position, which can lead to step loss. That is, the load does not reach the designated position after a given distance. Furthermore, when a stepper motor is selected for the load, the motor's drive speed is limited. When the motor drives a certain load to a certain speed, step loss will occur, affecting the accuracy of distance adjustment. Utility Model Content

[0003] The main purpose of this invention is to provide a drive distance compensation device, an optical zoom component, and a camera device, which aims to improve the problem of step loss in existing stepper motors, affecting the accuracy of distance adjustment.

[0004] To achieve the above objectives, the drive distance compensation device proposed in this utility model includes:

[0005] A drive structure includes a stepper motor and a ball screw, the ball screw extending along a first direction, the stepper motor being connected to the lead screw drive to drive the lead screw to rotate about an axis extending in the first direction, and the ball nut of the ball screw being movably disposed along the first direction and used to drive a component to be driven; and,

[0006] The correction structure includes an angle sensor and a magnet. One of the angle sensor and the magnet is disposed on the lead screw, and the other is fixedly disposed so as to be able to rotate relative to each other. The angle sensor is used to detect the angle of relative rotation of the magnet. The magnet has at least one set of magnetic poles, and two magnetic poles in the set of magnetic poles are spaced apart about an axis extending in a first direction.

[0007] The angle sensor includes a tunnel magnetoresistive angle sensor.

[0008] In one embodiment, the magnet is disposed on the lead screw so as to rotate with the lead screw about an axis extending in a first direction;

[0009] The angle sensor is fixedly installed and is used to measure the rotation angle of the magnet.

[0010] In one embodiment, the magnet is arranged in a ring and sleeved on the lead screw, with the magnet avoiding the threads of the lead screw.

[0011] In one embodiment, the magnet protrudes radially from the lead screw.

[0012] In one embodiment, the drive structure further includes a mounting base;

[0013] The two ends of the lead screw in the first direction are rotatably connected to the mounting base;

[0014] The angle sensor is disposed on the mounting base and is arranged to avoid the lead screw. The angle sensor is arranged radially on the lead screw at intervals from the magnet.

[0015] In one embodiment, the mounting base has a mounting hole extending radially along the lead screw;

[0016] The correction structure also includes a circuit board, which is disposed over the opening of the mounting hole away from the lead screw and is fixedly connected to the mounting base through a connecting structure. The circuit board is electrically connected to the angle sensor.

[0017] The angle sensor is located inside the mounting hole and is fixedly connected to the circuit board.

[0018] In one embodiment, the angle sensor is disposed on the lead screw so as to rotate with the lead screw about an axis extending in a first direction;

[0019] The magnet is fixedly installed and located on one side of the angle sensor in the first direction.

[0020] In one embodiment, the magnet has a plurality of magnetic pole groups, which are arranged at intervals around an axis extending in a first direction, and the two adjacent magnetic poles in two adjacent magnetic pole groups are arranged in opposite directions.

[0021] This utility model also proposes an optical zoom component, comprising:

[0022] Multiple drive distance compensation devices, each of which includes the aforementioned drive distance compensation device; and,

[0023] Multiple lens groups, each of which is driven by a ball nut of a drive distance compensation device, so as to move along a first direction with the corresponding ball nut.

[0024] This utility model also proposes a camera device, including:

[0025] The lens barrel extends along a first direction; and,

[0026] An optical zoom assembly, as described above, is disposed within the lens barrel, and the drive structure is fixedly connected to the lens barrel.

[0027] In the technical solution of this utility model, when the driving structure needs to drive the driven component to move along the first direction, the stepper motor operates. Since the stepper motor is connected to the lead screw of the ball screw, the stepper motor can drive the lead screw to rotate along the axis extending in the first direction. At this time, since the ball nut is connected to the driven component, the ball nut will not rotate around the axis extending in the first direction. The ball nut moves along the thread direction of the lead screw, thereby driving the driven component to move along the first direction, achieving the purpose of moving the driven component along the first direction. During the rotation of the lead screw around the axis extending in the first direction, one of the angle sensor and the magnet sensor rotates together with the lead screw, thus ensuring that the angle sensor and the magnet... When relative rotation occurs, since the angle sensor includes a tunneling magnetoresistive angle sensor, when relative rotation occurs between the angle sensor and the magnet, the angle sensor detects a change in the angle of the magnetic field of the magnet to obtain the rotation angle of the magnet, and then obtains the rotation angle of the lead screw. The distance the ball nut moves along the first direction is positively correlated with the rotation angle of the lead screw. Therefore, when the stepper motor loses steps, the distance the ball nut moves along the first direction is less than the target distance. Similarly, the rotation angle of the lead screw around the axis extending in the first direction is also less than the target angle. At this time, the correction structure can realize closed-loop feedback position and compensate for the movement position to solve the step loss problem, thereby improving the driving accuracy and driving speed of the stepper motor. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 A schematic diagram of an embodiment of the drive distance compensation device provided by this utility model;

[0030] Figure 2 for Figure 1 A schematic diagram of the structure of the drive distance compensation device (in another direction);

[0031] Figure 3 A schematic diagram of the structure of an embodiment of the optical zoom component provided by this utility model;

[0032] Figure 4A schematic diagram of the structure of an embodiment of the camera device provided by this utility model.

[0033] Explanation of icon numbers:

[0034] 1000. Camera equipment; 100. Optical zoom assembly; 10. Drive distance compensation device; 1. Drive structure; 11. Stepper motor; 12. Ball screw; 13. Mounting base; 14. Mounting hole; 2. Correction structure; 21. Angle sensor; 22. Magnet; 23. Circuit board; 3. Connection structure; 20. Lens group; 200. Lens barrel.

[0035] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0036] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0037] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0038] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0039] This invention proposes a drive distance compensation device, an optical zoom component, and a camera device. It aims to improve the problem of stepper motors losing steps, which affects the accuracy of distance adjustment.

[0040] Please see Figure 1-2 In one embodiment of this utility model, the drive distance compensation device 10 includes a drive structure 1 and a correction structure 2. The drive structure 1 includes a stepper motor 11 and a ball screw 12. The ball screw 12 extends along a first direction. The stepper motor 11 is connected to the lead screw of the ball screw 12 to drive the lead screw to rotate around the axis extending in the first direction. The ball nut of the ball screw 12 is movably arranged along the first direction and is used to drive the connection to the driven component. The correction structure 2 includes an angle sensor 21 and a magnet 22. One of the angle sensor 21 and the magnet 22 is disposed on the lead screw, and the other is fixedly disposed so that relative rotation can occur. The angle sensor 21 is used to detect the angle of relative rotation of the magnet 22. The magnet 22 has at least one magnetic pole group. Two magnetic poles in the magnetic pole group are spaced apart around the axis extending in the first direction. The angle sensor 21 includes a tunneling magnetoresistance angle sensor 21.

[0041] In the technical solution of this utility model, when the driving structure 1 needs to drive the driven component to move along the first direction, the stepper motor 11 operates. Since the stepper motor 11 is connected to the lead screw of the ball screw 12, the stepper motor 11 can drive the lead screw to rotate along the axis extending in the first direction. At this time, since the ball nut is connected to the driven component, the ball nut will not rotate around the axis extending in the first direction. The ball nut moves along the thread direction of the lead screw, thereby driving the driven component to move along the first direction, achieving the purpose of moving the driven component along the first direction. During the rotation of the lead screw around the axis extending in the first direction, one of the angle sensor 21 and the magnet 22 rotates together with the lead screw, thus enabling the angle sensor 21 and the magnet 22 to interact. When relative rotation occurs between the angle sensor 21 and the magnet 22, the angle sensor 21 detects a change in the angle of the magnetic field of the magnet 22 to obtain the rotation angle of the magnet 22, and thus the rotation angle of the lead screw. The distance the ball nut moves along the first direction is positively correlated with the rotation angle of the lead screw. Therefore, when the stepper motor 11 loses steps, the distance the ball nut moves along the first direction is less than the target distance. Similarly, the rotation angle of the lead screw around the axis extending in the first direction is also less than the target angle. At this time, the correction structure 2 can realize closed-loop feedback position and compensate for the movement position to solve the step loss problem, thereby improving the driving accuracy and driving speed of the stepper motor 11.

[0042] It is understood that this utility model is not limited to which structure of the angle sensor 21 and the magnet 22 is fixedly set and which structure is set on the lead screw. For example, in one embodiment of this utility model, the magnet 22 is set on the lead screw so as to rotate with the lead screw about an axis extending in a first direction, the angle sensor 21 is fixedly set, and the angle sensor 21 is used to measure the rotation angle of the magnet 22. With this configuration, when the drive structure 1 needs to drive the driven component to move along the first direction, the stepper motor 11 operates. Since the stepper motor 11 is connected to the lead screw of the ball screw 12, the stepper motor 11 can drive the lead screw to rotate along the axis extending in the first direction. At the same time, since the magnet 22 is located on the lead screw, the magnet 22 also rotates with the lead screw around the axis extending in the first direction. The angle sensor 21 is fixedly installed. When the magnet 22 rotates, the magnetic field of the magnet 22 relative to the angle sensor 21 changes, so that the angle sensor 21 can measure the rotation angle of the magnet 22, thereby obtaining the rotation angle of the lead screw and the movement distance of the ball nut, in order to determine whether a step loss problem has occurred.

[0043] In another embodiment of this utility model, the angle sensor 21 is disposed on the lead screw to rotate with the lead screw around an axis extending in the first direction. The magnet 22 is fixedly disposed and located on one side of the angle sensor 21 in the first direction. With this configuration, when the drive structure 1 needs to drive the driven component to move along the first direction, the stepper motor 11 operates. Since the stepper motor 11 is connected to the lead screw drive of the ball screw 12, it can drive the lead screw to rotate along the axis extending in the first direction. Simultaneously, since the angle sensor 21 is disposed on the lead screw, it also rotates with the lead screw around the axis extending in the first direction. At this time, the magnet 22 is fixedly disposed to prevent the angle sensor 21 from moving away from the magnetic field of the magnet 22 during rotation around the axis extending in the first direction, thus preventing the angle sensor from shifting away from the magnetic field of the magnet 22. Since the angle sensor 21 cannot accurately measure its relative rotation angle with the magnet 22, the magnet 22 is placed on one side of the angle sensor 21 in the first direction. In this way, during the rotation of the angle sensor 21 around the axis extending in the first direction, the distance between the angle sensor 21 and the magnet 22 in the first direction is kept constant, so that the angle sensor 21 is always within the magnetic field of the magnet 22. This ensures the accuracy of the relative rotation angle between the angle sensor 21 and the magnet 22, thereby ensuring the accuracy of the rotation angle of the lead screw and the movement distance of the ball nut, and achieving the purpose of determining whether a step loss problem has occurred.

[0044] Specifically, in this embodiment, the magnet 22 is disposed on the lead screw so as to rotate with the lead screw around an axis extending in a first direction. The angle sensor 21 is fixedly disposed and is used to measure the rotation angle of the magnet 22.

[0045] Furthermore, when the magnet 22 is disposed on the lead screw, the present invention does not limit the specific position of the magnet 22 on the lead screw. In one embodiment of the present invention, the magnet 22 is disposed at one end of the lead screw in a first direction and is fixedly connected to the lead screw so as to be able to rotate synchronously with the lead screw.

[0046] When the magnet 22 is disposed at one end of the lead screw in the first direction, the present invention does not limit the specific structural form of the magnet 22. In one embodiment of the present invention, the shape of the projection of the magnet 22 in the first direction can be set to a circle; in another embodiment of the present invention, the shape of the projection of the magnet 22 in the first direction can be set to a rectangle; and in other embodiments of the present invention, the shape of the projection of the magnet 22 in the first direction can also be set to a triangle or other shapes. In actual setting, it can be selected according to the requirements, as long as it is ensured that when the magnet 22 rotates around the axis extending in the first direction, the angle sensor 21 is always within the magnetic field of the magnet 22.

[0047] Similarly, when the magnet 22 is located at one end of the lead screw in the first direction, the present invention does not limit the specific position of the angle sensor 21. In one embodiment of the present invention, the angle sensor 21 is located on the side of the magnet 22 away from the lead screw in the first direction; in another embodiment of the present invention, the angle sensor 21 is arranged radially on the lead screw at intervals from the magnet 22.

[0048] In another embodiment of this utility model, the magnet 22 is arranged in a ring and sleeved on the lead screw, with the magnet 22 avoiding the threads of the lead screw. With this arrangement, when the stepper motor 11 drives the lead screw to rotate around the axis extending in the first direction, the lead screw can drive the magnet 22 to rotate together. Furthermore, since the magnet 22 is arranged in a ring, during the rotation of the magnet 22 around the axis extending in the first direction, the angle sensor 21 is always within the magnetic field of the magnet 22, ensuring the accuracy of the relative rotation angle between the angle sensor 21 and the magnet 22, allowing the correction structure 2 to accurately determine whether a step loss problem has occurred.

[0049] Specifically, in this embodiment, the magnet 22 is arranged in a ring and sleeved on the lead screw, and the magnet 22 avoids the thread of the lead screw.

[0050] Similarly, when the magnet 22 is sleeved on the lead screw, the present invention does not limit the specific setting position of the angle sensor 21. In one embodiment of the present invention, the angle sensor 21 is set on one side of the magnet 22 in the first direction, and the angle sensor 21 is set away from the lead screw; in another embodiment of the present invention, the angle sensor 21 is set at a distance from the magnet 22 in the radial direction of the lead screw.

[0051] Specifically, in this embodiment, the angle sensor 21 is arranged radially on the lead screw at intervals from the magnet 22.

[0052] It should be noted that, since the magnet 22 is sleeved on the lead screw and avoids the threaded portion of the lead screw, it can be understood that the diameter of the threaded portion of the lead screw in the first direction is usually larger than the diameter of the unthreaded portion, to ensure smooth tapping of the lead screw thread. In this case, to further improve the measurement accuracy of the angle sensor 21, in one embodiment of this invention, the magnet 22 protrudes radially from the lead screw. This arrangement further reduces the distance between the magnet 22 and the angle sensor 21, thereby improving the detection accuracy of the angle sensor 21.

[0053] In a further embodiment of this utility model, to ensure the rotational stability of the lead screw and the installation stability of the angle sensor 21, the drive structure 1 further includes a mounting base 13. The two ends of the lead screw in the first direction are rotatably connected to the mounting base 13. The angle sensor 21 is disposed on the mounting base 13, but is positioned to avoid the lead screw. The angle sensor 21 is positioned radially away from the magnet 22 on the lead screw. With this configuration, the mounting base 13 provides a stable mounting foundation for the angle sensor 21 and the lead screw, thereby further improving the operational stability of the drive distance compensation device 10.

[0054] Furthermore, to further improve the safety of the angle sensor 21 and extend the service life of the drive distance compensation device 10, in one embodiment of this invention, the mounting base 13 has a mounting hole 14 extending radially along the lead screw. The correction structure 2 also includes a circuit board 23, which covers the opening of the mounting hole 14 away from the lead screw and is fixedly connected to the mounting base 13 via a connecting structure 3. The circuit board 23 is electrically connected to the angle sensor 21, which is located within the mounting hole 14 and fixedly connected to the circuit board 23. With this configuration, the circuit board 23 can determine whether the stepper motor 11 has lost steps and supply power to the angle sensor 21 to maintain its operation. Simultaneously, placing the angle sensor 21 within the mounting hole 14 provides protection by housing it, thereby improving its safety and extending the service life of the drive distance compensation device 10.

[0055] It should be noted that this utility model does not limit the specific structural form of the connecting structure 3. In one embodiment of this utility model, the connecting structure 3 can be set as a connecting pin, which passes through the circuit board 23 to fix the mounting base 13, thereby fixing the circuit board 23 on the mounting base 13. In another embodiment of this utility model, the connecting structure 3 can be set as a connecting screw, in which case the connecting screw can pass through the circuit board 23 to engage with the mounting base 13 threadedly, thereby fixing the circuit board 23 on the mounting base 13. In other embodiments of this utility model, the connecting structure 3 can also be set as a welded part, an adhesive part, a snap-fit ​​part, or other structural forms. In actual setting, it can be selected according to the requirements, and this utility model does not limit it.

[0056] Furthermore, this invention does not limit the specific number of magnetic pole groups that the magnet 22 has. In one embodiment of this invention, the magnet 22 has only one magnetic pole group, and the two magnetic poles of the magnetic pole group are arranged opposite each other in the radial direction of the lead screw.

[0057] In another embodiment of the present invention, the magnet 22 has a plurality of magnetic pole groups, the plurality of magnetic pole groups are arranged at intervals around an axis extending in a first direction, and the two magnetic poles arranged adjacent to each other in two adjacent magnetic pole groups are arranged in opposite directions.

[0058] Specifically, the number of magnetic pole groups of the magnet 22 can be selected according to the actual needs during the actual setting.

[0059] This utility model also proposes an optical zoom component 100, please refer to [link / reference]. Figure 3The optical zoom assembly 100 includes multiple drive distance compensation devices 10 and multiple lens groups 20. The specific structure of the drive distance compensation device 10 is as described in the above embodiments. Since this optical zoom assembly 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. Each lens group 20 is driven and connected to a ball nut of a drive distance compensation device 10, so as to move along a first direction with the corresponding ball nut.

[0060] It is understood that the plurality of lens groups 20 include zoom groups and focusing lens groups.

[0061] This utility model also proposes a camera device 1000, please refer to [link / reference needed]. Figure 4 The camera device 1000 includes a lens barrel 200 and an optical zoom component 100. The specific structure of the optical zoom component 100 is as described in the above embodiments. Since the camera device 1000 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The optical zoom component 100 is disposed within the lens barrel 200, and the drive structure 1 is fixedly connected to the lens barrel 200. This ensures the installation stability of the drive structure 1, thereby ensuring the operational stability and driving distance accuracy of the drive distance compensation device 10.

[0062] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A drive distance compensation device, characterized in that, include: The drive structure includes a stepper motor and a ball screw. The ball screw extends along a first direction. The stepper motor is connected to the lead screw of the ball screw to drive the lead screw to rotate around the axis extending in the first direction. The ball nut of the ball screw is movably arranged along the first direction and is used to drive the connection to the driven component. as well as, The correction structure includes an angle sensor and a magnet. One of the angle sensor and the magnet is disposed on the lead screw, and the other is fixedly disposed so as to be able to rotate relative to each other. The angle sensor is used to detect the angle of relative rotation of the magnet. The magnet has at least one set of magnetic poles, and two magnetic poles in the set of magnetic poles are spaced apart about an axis extending in a first direction. The angle sensor includes a tunnel magnetoresistive angle sensor.

2. The drive distance compensation device as described in claim 1, characterized in that, The magnet is disposed on the lead screw so that it rotates with the lead screw about an axis extending in a first direction; The angle sensor is fixedly installed and is used to measure the rotation angle of the magnet.

3. The drive distance compensation device as described in claim 2, characterized in that, The magnet is arranged in a ring and is sleeved on the lead screw, with the magnet avoiding the threads of the lead screw.

4. The drive distance compensation device as described in claim 3, characterized in that, The magnet is positioned to protrude radially from the lead screw.

5. The drive distance compensation device as described in claim 2, characterized in that, The drive structure also includes a mounting base; The two ends of the lead screw in the first direction are rotatably connected to the mounting base; The angle sensor is disposed on the mounting base and is arranged to avoid the lead screw. The angle sensor is arranged radially on the lead screw at intervals from the magnet.

6. The drive distance compensation device as described in claim 5, characterized in that, The mounting base has a mounting hole extending radially along the lead screw; The correction structure also includes a circuit board, which is disposed over the opening of the mounting hole away from the lead screw and is fixedly connected to the mounting base through a connecting structure. The circuit board is electrically connected to the angle sensor. The angle sensor is located inside the mounting hole and is fixedly connected to the circuit board.

7. The drive distance compensation device as described in claim 1, characterized in that, The angle sensor is disposed on the lead screw so that it rotates with the lead screw about an axis extending in the first direction; The magnet is fixedly installed and located on one side of the angle sensor in the first direction.

8. The drive distance compensation device according to any one of claims 1 to 7, characterized in that, The magnet has multiple magnetic pole groups, which are arranged at intervals around an axis extending in a first direction, and the two adjacent magnetic poles in two adjacent magnetic pole groups are arranged in opposite directions.

9. An optical zoom component, characterized in that, include: Multiple drive distance compensation devices, each of the drive distance compensation devices including the drive distance compensation device as described in any one of claims 1 to 8; as well as, Multiple lens groups, each of which is driven by a ball nut of a drive distance compensation device, so as to move along a first direction with the corresponding ball nut.

10. A camera device, characterized in that, include: The lens barrel extends along a first direction; and, An optical zoom assembly, as described in claim 9, wherein the optical zoom assembly is disposed within the lens barrel, and the drive structure is fixedly connected to the lens barrel.

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