CN113991965A - Camera stability control system and method - Google Patents

Camera stability control system and method Download PDF

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Publication number
CN113991965A
CN113991965A CN202111616022.7A CN202111616022A CN113991965A CN 113991965 A CN113991965 A CN 113991965A CN 202111616022 A CN202111616022 A CN 202111616022A CN 113991965 A CN113991965 A CN 113991965A
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magnetic
magnetic field
mechanisms
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amr sensor
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CN113991965B (en
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许英华
沙玉新
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Vtran Intelligent Technology Changzhou Co ltd
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Vtran Intelligent Technology Changzhou Co ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K41/00—Propulsion systems in which a rigid body is moved along a path due to dynamo-electric interaction between the body and a magnetic field travelling along the path
    • H02K41/02—Linear motors; Sectional motors
    • H02K41/035—DC motors; Unipolar motors
    • H02K41/0352—Unipolar motors
    • H02K41/0354—Lorentz force motors, e.g. voice coil motors
    • H02K41/0356—Lorentz force motors, e.g. voice coil motors moving along a straight path
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B5/00—Adjustment of optical system relative to image or object surface other than for focusing
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/20—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for measuring, monitoring, testing, protecting or switching
    • H02K11/21—Devices for sensing speed or position, or actuated thereby
    • H02K11/215—Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K11/00—Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection
    • H02K11/30—Structural association with control circuits or drive circuits
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P5/00—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors
    • H02P5/46—Arrangements specially adapted for regulating or controlling the speed or torque of two or more electric motors for speed regulation of two or more dynamo-electric motors in relation to one another
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
    • H02P7/00—Arrangements for regulating or controlling the speed or torque of electric DC motors
    • H02P7/02—Arrangements for regulating or controlling the speed or torque of electric DC motors the DC motors being of the linear type
    • H02P7/025—Arrangements for regulating or controlling the speed or torque of electric DC motors the DC motors being of the linear type the DC motors being of the moving coil type, e.g. voice coil motors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Electromagnetism (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • General Physics & Mathematics (AREA)
  • Adjustment Of Camera Lenses (AREA)

Abstract

The invention discloses a camera stability control system and a camera stability control method, which belong to the technical field of camera control, wherein the camera stability control system comprises a controller, a first AMR sensor, a second AMR sensor, a first group of magnetic mechanisms, a second group of magnetic mechanisms, at least one first coil and at least one second coil; the first group of magnetic mechanisms comprises at least one first magnetic mechanism, and each first magnetic mechanism is provided with a first coil; the second group of magnetic mechanisms comprises at least one second magnetic mechanism, and each second magnetic mechanism is provided with a second coil; the first group of magnetic mechanisms are arranged at a first position and used for generating a magnetic field signal; the second group of magnetic mechanisms are arranged at a second position and used for generating magnetic field signals; the controller is respectively connected with the AMR sensor and the coil, and adjusts the current flowing through the corresponding coil according to the magnetic field signal induced by the AMR sensor, so as to control the movement of the magnetic mechanism. The camera stability control system and the camera stability control method can adjust the movement of the lens in the horizontal direction and accurately control the position of the lens.

Description

Camera stability control system and method
Technical Field
The invention belongs to the technical field of camera control, relates to a camera control system, and particularly relates to a camera stability control system.
Background
Optical image stabilization (OIS-optical image stabilizer) is an effective solution in a camera stabilization system, solves the image quality problem, and with the rapid development of consumer electronics, consumers demand higher-resolution optical zoom cameras, which are packaged into smaller and lighter DSCs and mobile phones, and the blur caused by hand shake becomes more obvious, and the stabilization system becomes a standard function.
How to solve the hand shake becomes an important index for evaluating the camera stabilization system. Blur caused by hand shake can be reduced by stabilizing the camera. The microcontroller transmits the hand shaking signal to a small linear motor of the moving image sensor to compensate the motion of the camera.
For the OIS system to work properly, the choice of sensors is very important and the corresponding actuators and other equipment must be matched. The most common actuator is a voice coil motor, an electromagnetic linear motor, used to drive the lens, combined with strong permanent magnets, two coils for driving the platform vertically and horizontally. Due to the strong magnetic field inherent to the system, the anisotropic magnetoresistive sensor can track the position of the platform by measuring the angle formed by the magnetic fields in two directions. The motor and the sensor can be tightly integrated in a package to work together, so that the aim of accurately controlling the position of the platform is fulfilled. However, the control accuracy of the conventional camera stabilization system cannot meet the user's requirement, and needs to be improved.
In view of the above, there is a need to design a new camera stabilization system to overcome at least some of the above-mentioned disadvantages of the existing camera stabilization systems.
Disclosure of Invention
The invention provides a camera stability control system and method, which can adjust the movement of a lens in the horizontal direction and accurately control the position of the lens.
In order to solve the technical problem, according to one aspect of the present invention, the following technical solutions are adopted: a camera stabilization control system, the camera stabilization control system comprising: the sensor comprises a controller, a first AMR sensor, a second AMR sensor, a first group of magnetic mechanisms, a second group of magnetic mechanisms, at least one first coil and at least one second coil.
The first group of magnetic mechanisms comprises at least one first magnetic mechanism, and each first magnetic mechanism is provided with a first coil; the second set of magnetic means comprises at least one second magnetic means, each second magnetic means being provided with a second coil.
The first group of magnetic mechanisms are arranged at a first position and used for generating a magnetic field signal; the second group of magnetic mechanisms is arranged at a second position and used for generating a magnetic field signal.
The first AMR sensor is arranged close to the first group of magnetic mechanisms and is used for sensing a magnetic field strength signal or/and a magnetic field angle signal.
The second AMR sensor is arranged close to the second group of magnetic mechanisms and is used for sensing a magnetic field strength signal or/and a magnetic field angle signal.
The controller is respectively connected with the first AMR sensor and the first coil, and adjusts the current flowing through the first coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the first AMR sensor, so as to control the movement of the first group of magnetic mechanisms.
The controller is respectively connected with the second AMR sensor and the second coil, and adjusts the current flowing through the second coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the second AMR sensor, so as to control the motion of the second group of magnetic mechanisms.
In an embodiment of the present invention, the first set of magnetic mechanisms and the second set of magnetic mechanisms have the same structure and are arranged in a central symmetry manner.
In one embodiment of the present invention, the first set of magnetic mechanisms includes two first magnetic mechanisms symmetrically disposed, and the first magnetic mechanisms are respectively referred to as a third magnetic mechanism and a fifth magnetic mechanism.
The third magnetic mechanism and the fifth magnetic mechanism have the same structure and the same magnetizing direction, and the moving direction of the third magnetic mechanism and the fifth magnetic mechanism is the first direction.
The second group of magnetic mechanisms comprises two second magnetic mechanisms which are symmetrically arranged and are respectively marked as a fourth magnetic mechanism and a sixth magnetic mechanism.
The fourth magnetic mechanism and the sixth magnetic mechanism have the same structure and the same magnetizing direction, and the moving direction of the fourth magnetic mechanism and the sixth magnetic mechanism is the second direction.
The magnetizing directions of the fourth magnetic mechanism and the sixth magnetic mechanism are vertical to the magnetizing directions of the third magnetic mechanism and the fifth magnetic mechanism; the first direction is perpendicular to the second direction.
As an embodiment of the present invention, the first AMR sensor is configured to sense a magnetic field strength signal or/and a magnetic field angle signal; the first AMR sensor senses a change in the magnetic field strength signal or/and the magnetic field angle signal when the first set of magnetic mechanisms moves such that the magnetic field strength signal or/and the magnetic field angle signal changes.
The controller adjusts the current flowing through the first coil according to the change of the magnetic field intensity signal or/and the magnetic field angle signal sensed by the first AMR sensor, so as to control the motion of the first group of magnetic mechanisms.
As an embodiment of the present invention, the second AMR sensor is configured to sense a magnetic field strength signal or/and a magnetic field angle signal; the second AMR sensor senses a change in the magnetic field strength signal or/and the magnetic field angle signal when the second set of magnetic mechanisms moves such that the magnetic field strength signal or/and the magnetic field angle signal changes.
And the controller adjusts the current flowing through the second coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the second AMR sensor, so as to control the motion of the second group of magnetic mechanisms.
According to another aspect of the invention, the following technical scheme is adopted: a camera stabilization control method, the camera stabilization control method comprising: the first set of magnetic mechanisms generates magnetic field signals; the first AMR sensor is arranged close to the first group of magnetic mechanisms and senses a magnetic field intensity signal or/and a magnetic field angle signal; the controller is respectively connected with the first AMR sensor and the first coil, and adjusts the current flowing through the first coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the first AMR sensor, so as to control the movement of the first group of magnetic mechanisms and the first coil.
The second set of magnetic mechanisms generates magnetic field signals; a second AMR sensor is arranged close to the second group of magnetic mechanisms and used for sensing a magnetic field intensity signal or/and a magnetic field angle signal; the controller is respectively connected with the second AMR sensor and the second coil, and adjusts the current flowing through the second coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the second AMR sensor, so as to control the movement of the second group of magnetic mechanisms and the second coil.
As an embodiment of the present invention, the first AMR sensor senses a magnetic field strength signal or/and a magnetic field angle signal; the first AMR sensor senses a change in the magnetic field strength signal or/and the magnetic field angle signal when the first set of magnetic mechanisms moves such that the magnetic field strength signal or/and the magnetic field angle signal changes.
The controller adjusts the current flowing through the first coil according to the change of the magnetic field intensity signal or/and the magnetic field angle signal sensed by the first AMR sensor, so as to control the motion of the first group of magnetic mechanisms.
As an embodiment of the present invention, the second AMR sensor senses a magnetic field strength signal or/and a magnetic field angle signal; the second AMR sensor senses a change in the magnetic field strength signal or/and the magnetic field angle signal when the second set of magnetic mechanisms moves such that the magnetic field strength signal or/and the magnetic field angle signal changes.
And the controller adjusts the current flowing through the second coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the second AMR sensor, so as to control the motion of the second group of magnetic mechanisms.
In an embodiment of the present invention, the first set of magnetic mechanisms and the second set of magnetic mechanisms have the same structure and are arranged in a central symmetry manner.
In one embodiment of the present invention, the first set of magnetic mechanisms includes two first magnetic mechanisms symmetrically disposed, and the first magnetic mechanisms are respectively referred to as a third magnetic mechanism and a fifth magnetic mechanism.
The third magnetic mechanism and the fifth magnetic mechanism have the same structure and the same magnetizing direction, and the moving direction of the third magnetic mechanism and the fifth magnetic mechanism is the first direction.
The second group of magnetic mechanisms comprises two second magnetic mechanisms which are symmetrically arranged and are respectively marked as a fourth magnetic mechanism and a sixth magnetic mechanism.
The fourth magnetic mechanism and the sixth magnetic mechanism have the same structure and the same magnetizing direction, and the moving direction of the fourth magnetic mechanism and the sixth magnetic mechanism is the second direction.
The magnetizing directions of the fourth magnetic mechanism and the sixth magnetic mechanism are vertical to the magnetizing directions of the third magnetic mechanism and the fifth magnetic mechanism; the first direction is perpendicular to the second direction.
The invention has the beneficial effects that: the camera stability control system and the camera stability control method can adjust the movement of the lens in the horizontal direction and accurately control the position of the lens.
The invention uses the anisotropic magneto-resistance sensor AMR, has higher sensitivity and linearity than a Hall sensor, can accurately receive a magnetic field or a magnetic field angle signal of the position of the existing magnetic mechanism, and feeds back the magnetic field or the magnetic field angle signal to the controller, so as to achieve the aim of more accurately controlling the tiny displacement of the iron mechanism. The AMR sensor can control the angular precision of the camera to be less than 0.1 degrees, and the displacement tolerance can be controlled to be 2-3 um. The method for controlling the position of the magnetic mechanism and the focusing position of the camera more accurately can offset the offset caused by camera shake, so that the picture taking is clearer. Moreover, the AMR sensor has higher sensitivity than the HALL sensor, and the size of a magnetic mechanism can be greatly reduced, thereby reducing the cost.
Drawings
Fig. 1 is a distribution diagram of a camera stabilization control system in the prior art.
Fig. 2 is a schematic top distribution diagram of a camera stabilization control system in embodiment 1 of the present invention.
Fig. 3 is a schematic side view distribution diagram of a camera stabilization control system in embodiment 1 of the present invention.
Fig. 4 is a schematic side view distribution diagram of a camera stabilization control system in embodiment 2 of the present invention.
FIG. 5 is a prior art magnetic field signal profile of a HALL sensor.
Fig. 6 is a diagram illustrating a magnetic field angle signal distribution sensed by the AMR sensor according to the embodiment 1 of the present invention.
Fig. 7 is a diagram illustrating a magnetic field angle signal distribution sensed by the AMR sensor according to the embodiment 2 of the present invention.
The drawings are labeled as follows:
1: a first AMR sensor; 2: a second AMR sensor; 3: a third magnetic mechanism;
4: a fourth magnetic mechanism; 5: a fifth magnetic mechanism; 6: a sixth magnetic mechanism;
7: a third coil; 8: a fourth coil; 9: a fifth coil;
10: a sixth coil; 11: a first Hall sensor; 12: a second Hall sensor.
Detailed Description
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
For a further understanding of the invention, reference will now be made to the preferred embodiments of the invention by way of example, and it is to be understood that the description is intended to further illustrate features and advantages of the invention, and not to limit the scope of the claims.
The description in this section is for several exemplary embodiments only, and the present invention is not limited only to the scope of the embodiments described. It is within the scope of the present disclosure and protection that the same or similar prior art means and some features of the embodiments may be interchanged.
The steps in the embodiments in the specification are only expressed for convenience of description, and the implementation manner of the present application is not limited by the order of implementation of the steps. The term "connected" in the specification includes both direct connection and indirect connection.
Fig. 2 to 3 are schematic distribution diagrams of a camera stability control system in embodiment 1 of the present invention; referring to fig. 2 to 3, the camera stabilization control system includes: the sensor comprises a controller, a first AMR sensor 1, a second AMR sensor 2, a first group of magnetic mechanisms, a second group of magnetic mechanisms, at least one first coil and at least one second coil.
The first group of magnetic mechanisms are arranged at a first position and used for generating a magnetic field signal; the second group of magnetic mechanisms is arranged at a second position and used for generating a magnetic field signal. In an embodiment of the present invention, the first set of magnetic mechanisms and the second set of magnetic mechanisms have the same structure and the same size, and are arranged in a central symmetry manner.
The first set of magnetic means comprises at least one first magnetic means, each first magnetic means being provided with a first coil. In one embodiment, as shown in fig. 2, the first set of magnetic means comprises a third magnetic means 3, a fifth magnetic means 5; a first coil (referred to as a third coil 7) is provided below the third magnetic mechanism 3, and a first coil (referred to as a fifth coil 9) is provided below the fifth magnetic mechanism 5. In an embodiment, the third magnetic mechanism 3 and the fifth magnetic mechanism 5 have the same structure (of course, the structures may be different), are arranged in parallel, and have the same magnetizing direction; the movement directions of the third magnetic mechanism 3 and the fifth magnetic mechanism 5 are the first direction.
The second set of magnetic means comprises at least one second magnetic means, each second magnetic means being provided with a second coil. In one embodiment, as shown in FIG. 2, the second set of magnetic mechanisms includes a fourth magnetic mechanism 4, a sixth magnetic mechanism 6; a second coil (referred to as a fourth coil 8) is provided below the fourth magnetic means 4, and a second coil (referred to as a sixth coil 10) is provided below the sixth magnetic means 6. In an embodiment, the fourth magnetic mechanism 4 and the sixth magnetic mechanism 6 are the same in structure (of course, the structure may be different) as the third magnetic mechanism 3 and the fifth magnetic mechanism 5, and are arranged in parallel, and the magnetizing directions are the same; meanwhile, the magnetizing directions of the fourth magnetic mechanism 4 and the sixth magnetic mechanism 6 are perpendicular to the magnetizing direction of the third magnetic mechanism 3. The moving directions of the fourth magnetic mechanism 4 and the sixth magnetic mechanism 6 are the second direction; the first direction is perpendicular to the second direction.
In one embodiment, the third magnetic mechanism 3, the fifth magnetic mechanism 5, the fourth magnetic mechanism 4, and the sixth magnetic mechanism 6 are disposed at the front, rear, left, and right of the setting position, respectively. Each magnetic mechanism can be a magnet, and the magnet material can be neodymium iron boron material with high magnetic field intensity, also can be samarium cobalt material or permanent magnetic ferrite material.
The first AMR sensor 1 is arranged close to the third magnetic means 3, the first AMR sensor 1 being configured to sense a magnetic field strength signal or/and a magnetic field angle signal. The second AMR sensor 2 is arranged close to the fourth magnetic means 4, the second AMR sensor 2 being configured to sense a magnetic field strength signal or/and a magnetic field angle signal. The AMR sensor can be disposed on a lower side of a magnetic mechanism (e.g., outside the edge of the magnetic mechanism, as shown in fig. 2 and 3), or can be disposed below a magnetic mechanism (e.g., as shown in fig. 4).
The relative position of the first AMR sensor 1 with respect to the third magnetic means 3 and the relative position of the second AMR sensor 2 with respect to the fourth magnetic means 4 coincide completely. The position of the sensor from the magnetic mechanism directly influences the linearity of the signals received by the sensor and the cross influence between the signals.
The controller is respectively connected with the first AMR sensor 1 and the first coil, and adjusts the current flowing through the first coil according to the data sensed by the first AMR sensor 1, so as to control the motion of the first group of magnetic mechanisms.
The controller is respectively connected with the second AMR sensor 2 and the second coil, and adjusts the current flowing through the second coil according to the data sensed by the second AMR sensor 2, so as to control the motion of the second group of magnetic mechanisms.
In an embodiment of the present invention, the first AMR sensor 1 is configured to sense a magnetic field strength signal or/and a magnetic field angle signal; when the third magnetic means 3 or/and the fifth magnetic means 5 are moved such that the magnetic field strength signal or/and the magnetic field angle signal changes, the first AMR sensor 1 senses the change in the magnetic field strength signal or/and the magnetic field angle signal. The controller adjusts the current flowing through the third coil 7 or/and the fifth coil 9 according to the change of the magnetic field strength signal or/and the magnetic field angle signal sensed by the first AMR sensor 1, thereby controlling the movement of the third magnetic mechanism 3 or/and the fifth magnetic mechanism 5.
If the lateral X position of the third magnetic mechanism and the fifth magnetic mechanism in the first set of magnetic mechanisms are different, the magnetic field strength signal or/and the magnetic field angle signal received by the first AMR sensor are also different, and then the controller adjusts the current in the OIS coils (the third coil and the fifth coil) to control the movement of the third magnetic mechanism or/and the fifth magnetic mechanism.
The second AMR sensor 2 is used for sensing a magnetic field intensity signal or/and a magnetic field angle signal; when the fourth magnetic means 4 or/and the sixth magnetic means 6 are moved such that the magnetic field strength signal or/and the magnetic field angle signal changes, the second AMR sensor 2 senses the change in the magnetic field strength signal or/and the magnetic field angle signal. The controller adjusts the current flowing through the fourth coil 8 or/and the sixth coil 10 according to the change of the magnetic field strength signal or/and the magnetic field angle signal sensed by the second AMR sensor 2, thereby controlling the movement of the fourth magnetic means 4 or/and the sixth magnetic means 6.
When the second set of magnetic mechanisms (the fourth magnetic mechanism and the sixth magnetic mechanism) moves longitudinally, magnetic field angle signals received by the second AMR sensor are different, and then the controller adjusts the current in the OIS coil (the fourth coil and the sixth coil) to control the movement of the fourth magnetic mechanism or/and the sixth magnetic mechanism.
The current in the third coil and the fifth coil is changed, and the Lorentz force is changed, so that the third magnetic mechanism and the fifth magnetic mechanism can be driven to move; and the current in the fourth coil and the sixth coil is changed, and the Lorentz force is changed, so that the fourth magnetic mechanism and the sixth magnetic mechanism can be driven to move. The camera stabilizing system is suitable for scenes such as mobile phones, cameras and video cameras. The coil may be an OIS coil.
In one use scenario of the present invention, the OIS camera stabilizing structure includes an OIS coil and an AMR sensor and magnet. The magnetizing direction of the first group of magnetic mechanisms is along the X axis; the magnetizing direction of the second group of magnetic mechanisms is along the Y axis; the signal receiving planes of the first AMR sensor and the second AMR sensor are consistent and are XY planes.
The position of the first AMR sensor and the second AMR sensor relative to the magnet directly influences the sensitivity of the sensors. In an alternative embodiment, the shape of the first and second sets of magnetic means may be changed, the position of the sensor may be changed, and the change in shape and position of the sensor may affect the sensitivity of the sensor.
The camera stability control system formed by matching the AMR sensor and the magnetic mechanism is used as an example 1, and the camera stability control system formed by matching the hall sensor and the magnetic mechanism is used as an existing implementation (as shown in fig. 1, the camera stability control system includes a first hall sensor 11 and a second hall sensor 12). When the second Group of magnetic mechanisms are respectively tested at different positions (-0.2 mm, 0mm and 0.2 mm) of the Y axis, the linearity of three angle signals received by the first sensor when the first Group of magnetic mechanisms move in the X-axis stroke and the cross influence between the three angle signals (the cross influence can be regarded as the influence of the Group B magnet on the magnetic field of the Group A magnet when the Group B magnet moves).
In embodiment 1, the received signals of the AMR sensor are magnetic field angle signals of Bx and By, and the obtained signal curve is shown in fig. 6, where fig. 6 lists the fitting functions of three straight lines — the relationship between the magnetic field angle y and the moving distance x; in the prior art, the received signal of the HALL sensor is the magnetic field strength perpendicular to the Bz (shown in fig. 1) of the XY plane, and the signal curve is shown in fig. 5. The fit function of three straight lines is shown in fig. 5 as the relation between the magnetic field strength y and the distance x traveled. R2 in both figures represents the degree of linearity of the straight line, the closer to 1, the better the linearity is.
Although the linearity is good from the view of the curve itself, the linearity and the cross effect of the two can be obtained by accurate calculation as shown in table 1 below.
Figure DEST_PATH_IMAGE001
TABLE 1
From table 1 it can be seen that although the AMR sensor interferes a little bit with the first set of magnetic means when they move, AMR performs much better in terms of linearity of the signal itself, with an overall tolerance of only half that of a Hall sensor.
Referring to fig. 4, in another embodiment of the invention, in embodiment 2, the camera stabilization control system includes an OIS coil, an AMR sensor, and a magnet. The first AMR sensor 1 and the second AMR sensor 2 are respectively placed under the centers of the third magnetic mechanism 3 and the fourth magnetic mechanism 4, and the relative positions of the first AMR sensor 1 and the third magnetic mechanism 3 and the relative positions of the second AMR sensor 2 and the fourth magnetic mechanism 4 are completely consistent.
The first group of magnetic mechanisms (comprising a third magnetic mechanism 3 and a fifth magnetic mechanism 5) has the magnetizing direction along the X axis; a second group of magnetic mechanisms (comprising a fourth magnetic mechanism 4 and a sixth magnetic mechanism 6) with the magnetizing direction along the Y axis; the signal receiving plane of the first AMR sensor 1 is an XZ plane, and the signal receiving plane of the second AMR sensor 2 is a YZ plane.
The position tolerance of the first AMR sensor 1 and the second AMR sensor 2 directly below the magnet center directly affects the sensitivity of the sensors.
The camera stability control system formed By the AMR sensor and the magnet in fig. 4 is taken as an embodiment 2, the received signals of the embodiment 2 are magnetic field angle signals of By and Bz, the obtained signal curve is shown in fig. 7, the relationship between the fitting function of three straight lines, namely the magnetic field angle y and the moving distance x, is listed in fig. 7, and the linearity and the cross influence are shown in table 2.
Figure DEST_PATH_IMAGE002
TABLE 2
Referring to fig. 7, in conjunction with table 2, it can be seen that the linearity of the signal itself is better in this embodiment, but the magnetic field disturbance of the second set of magnetic elements to the first set of magnetic elements is a little higher, but the total tolerance is also small, approaching half of that of the HALL sensor.
In an alternative embodiment, the shape of the first and second sets of magnetic means may be varied, but both shape variations affect the sensitivity of the sensor. In an alternative embodiment, the position of the sensor may be varied, for example not directly below, but slightly offset along the long axis of the magnet, although both shape and position changes affect the sensitivity of the sensor.
The invention further discloses a camera stability control method, which comprises the following steps: the first set of magnetic mechanisms generates magnetic field signals; a first AMR sensor is arranged close to the first group of magnetic mechanisms, and the first AMR sensor senses a magnetic field signal; the controller is respectively connected with the first AMR sensor and the first coil, and adjusts the current flowing through the first coil according to the data sensed by the first AMR sensor, so as to control the movement of the first group of magnetic mechanisms.
The second set of magnetic mechanisms generates magnetic field signals; a second AMR sensor is arranged close to the second group of magnetic mechanisms and used for sensing a magnetic field signal; the controller is respectively connected with the second AMR sensor and the second coil, and adjusts the current flowing through the second coil according to the data sensed by the second AMR sensor, so as to control the motion of the second group of magnetic mechanisms.
In an embodiment of the present invention, the first AMR sensor senses a magnetic field angle signal; the first AMR sensor senses a change in the magnetic field angle signal when the first set of magnetic mechanisms moves such that the magnetic field angle signal changes; the controller adjusts the current flowing through the first coil according to the change of the magnetic field angle signal sensed by the first AMR sensor, so as to control the movement of the first group of magnetic mechanisms.
The second AMR sensor senses a magnetic field angle signal; when the second group of magnetic mechanisms moves to change the magnetic field angle signals, the second AMR sensor senses the change of the magnetic field angle signals; the controller adjusts the current flowing through the second coil according to the change of the magnetic field angle signal sensed by the second AMR sensor, so as to control the motion of the second group of magnetic mechanisms.
In summary, the camera stability control system and method provided by the invention can adjust the movement of the lens in the horizontal direction, and accurately control the position of the lens.
It should be noted that the present application may be implemented in software and/or a combination of software and hardware; for example, it may be implemented using Application Specific Integrated Circuits (ASICs), general purpose computers, or any other similar hardware devices. In some embodiments, the software programs of the present application may be executed by a processor to implement the above steps or functions. As such, the software programs (including associated data structures) of the present application can be stored in a computer-readable recording medium; such as RAM memory, magnetic or optical drives or diskettes, and the like. In addition, some steps or functions of the present application may be implemented using hardware; for example, as circuitry that cooperates with the processor to perform various steps or functions.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The description and applications of the invention herein are illustrative and are not intended to limit the scope of the invention to the embodiments described above. Effects or advantages referred to in the embodiments may not be reflected in the embodiments due to interference of various factors, and the description of the effects or advantages is not intended to limit the embodiments. Variations and modifications of the embodiments disclosed herein are possible, and alternative and equivalent various components of the embodiments will be apparent to those skilled in the art. It will be clear to those skilled in the art that the present invention may be embodied in other forms, structures, arrangements, proportions, and with other components, materials, and parts, without departing from the spirit or essential characteristics thereof. Other variations and modifications of the embodiments disclosed herein may be made without departing from the scope and spirit of the invention.

Claims (10)

1. A camera stabilization control system, comprising: the sensor comprises a controller, a first AMR sensor, a second AMR sensor, a first group of magnetic mechanisms, a second group of magnetic mechanisms, at least one first coil and at least one second coil;
the first group of magnetic mechanisms comprises at least one first magnetic mechanism, and each first magnetic mechanism is provided with a first coil; the second group of magnetic mechanisms comprises at least one second magnetic mechanism, and each second magnetic mechanism is provided with a second coil;
the first group of magnetic mechanisms are arranged at a first position and used for generating a magnetic field signal; the second group of magnetic mechanisms are arranged at a second position and used for generating magnetic field signals;
the first AMR sensor is arranged close to the first group of magnetic mechanisms and is used for sensing a magnetic field intensity signal or/and a magnetic field angle signal;
the second AMR sensor is arranged close to the second group of magnetic mechanisms and is used for sensing a magnetic field intensity signal or/and a magnetic field angle signal;
the controller is respectively connected with the first AMR sensor and the first coil, and adjusts the current flowing through the first coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the first AMR sensor, so as to control the motion of the first group of magnetic mechanisms;
the controller is respectively connected with the second AMR sensor and the second coil, and adjusts the current flowing through the second coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the second AMR sensor, so as to control the motion of the second group of magnetic mechanisms.
2. The camera stabilization control system of claim 1, wherein:
the first group of magnetic mechanisms and the second group of magnetic mechanisms have the same structure and are arranged in a central symmetry manner.
3. The camera stabilization control system of claim 1, wherein:
the first group of magnetic mechanisms comprise two first magnetic mechanisms which are symmetrically arranged and are respectively marked as a third magnetic mechanism and a fifth magnetic mechanism;
the third magnetic mechanism and the fifth magnetic mechanism have the same structure and the same magnetizing direction, and the moving direction of the third magnetic mechanism and the fifth magnetic mechanism is the first direction;
the second group of magnetic mechanisms comprise two second magnetic mechanisms which are symmetrically arranged and are respectively marked as a fourth magnetic mechanism and a sixth magnetic mechanism;
the fourth magnetic mechanism and the sixth magnetic mechanism have the same structure and the same magnetizing direction, and the moving direction of the fourth magnetic mechanism and the sixth magnetic mechanism is a second direction;
the magnetizing directions of the fourth magnetic mechanism and the sixth magnetic mechanism are vertical to the magnetizing directions of the third magnetic mechanism and the fifth magnetic mechanism; the first direction is perpendicular to the second direction.
4. The camera stabilization control system of claim 1, wherein:
the first AMR sensor is used for sensing a magnetic field intensity signal or/and a magnetic field angle signal; the first AMR sensor senses a change in the magnetic field strength signal or/and the magnetic field angle signal when the first set of magnetic mechanisms moves such that the magnetic field strength signal or/and the magnetic field angle signal changes;
the controller adjusts the current flowing through the first coil according to the change of the magnetic field intensity signal or/and the magnetic field angle signal sensed by the first AMR sensor, so as to control the motion of the first group of magnetic mechanisms.
5. The camera stabilization control system of claim 1, wherein:
the second AMR sensor is used for sensing a magnetic field intensity signal or/and a magnetic field angle signal; the second AMR sensor senses the change of the magnetic field strength signal or/and the magnetic angle signal when the second group of magnetic mechanisms moves to change the magnetic field strength signal or/and the magnetic field angle signal;
and the controller adjusts the current flowing through the second coil according to the magnetic field intensity signal or/and the magnetic field angle signal which is sensed and output by the second AMR sensor, so as to control the motion of the second group of magnetic mechanisms.
6. A camera stabilization control method, comprising:
the first set of magnetic mechanisms generates magnetic field signals;
the first AMR sensor is arranged close to the first group of magnetic mechanisms and senses a magnetic field intensity signal or/and a magnetic field angle signal;
the controller is respectively connected with the first AMR sensor and the first coil, and adjusts the current flowing through the first coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the first AMR sensor, so as to control the motion of the first group of magnetic mechanisms;
the second set of magnetic mechanisms generates magnetic field signals;
a second AMR sensor is arranged close to the second group of magnetic mechanisms, and the second AMR sensor senses a magnetic field intensity signal or/and a magnetic field angle signal;
the controller is respectively connected with the second AMR sensor and the second coil, and adjusts the current flowing through the second coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the second AMR sensor, so as to control the motion of the second group of magnetic mechanisms.
7. The camera stabilization control method according to claim 6, characterized in that:
the first AMR sensor senses a magnetic field intensity signal or/and a magnetic field angle signal; the first AMR sensor senses a change in the magnetic field strength signal or/and the magnetic field angle signal when the first set of magnetic mechanisms moves such that the magnetic field strength signal or/and the magnetic field angle signal changes;
the controller adjusts the current flowing through the first coil according to the change of the magnetic field intensity signal or/and the magnetic field angle signal sensed by the first AMR sensor, so as to control the motion of the first group of magnetic mechanisms.
8. The camera stabilization control method according to claim 6, characterized in that:
the second AMR sensor senses a magnetic field intensity signal or/and a magnetic field angle signal; the second AMR sensor senses the change of the magnetic field strength signal or/and the magnetic field angle signal when the second group of magnetic mechanisms moves to change the magnetic field strength signal or/and the magnetic field angle signal;
and the controller adjusts the current flowing through the second coil according to the magnetic field intensity signal or/and the magnetic field angle signal sensed by the second AMR sensor, so as to control the motion of the second group of magnetic mechanisms.
9. The camera stabilization control method according to claim 6, characterized in that:
the first group of magnetic mechanisms and the second group of magnetic mechanisms have the same structure and are arranged in a central symmetry manner.
10. The camera stabilization control method according to claim 6, characterized in that:
the first group of magnetic mechanisms comprise two first magnetic mechanisms which are symmetrically arranged and are respectively marked as a third magnetic mechanism and a fifth magnetic mechanism;
the third magnetic mechanism and the fifth magnetic mechanism have the same structure and the same magnetizing direction, and the moving direction of the third magnetic mechanism and the fifth magnetic mechanism is the first direction;
the second group of magnetic mechanisms comprise two second magnetic mechanisms which are symmetrically arranged and are respectively marked as a fourth magnetic mechanism and a sixth magnetic mechanism;
the fourth magnetic mechanism and the sixth magnetic mechanism have the same structure and the same magnetizing direction, and the moving direction of the fourth magnetic mechanism and the sixth magnetic mechanism is a second direction;
the magnetizing directions of the fourth magnetic mechanism and the sixth magnetic mechanism are vertical to the magnetizing directions of the third magnetic mechanism and the fifth magnetic mechanism; the first direction is perpendicular to the second direction.
CN202111616022.7A 2021-12-28 2021-12-28 Camera stability control system and method Active CN113991965B (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107688245A (en) * 2016-08-04 2018-02-13 台湾东电化股份有限公司 Optical module driving device
CN107734217A (en) * 2016-08-10 2018-02-23 苹果公司 The closed loop location control of camera actuator
CN113758504A (en) * 2020-05-28 2021-12-07 Tdk株式会社 Position detection device, lens module and camera device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107688245A (en) * 2016-08-04 2018-02-13 台湾东电化股份有限公司 Optical module driving device
CN107734217A (en) * 2016-08-10 2018-02-23 苹果公司 The closed loop location control of camera actuator
CN113758504A (en) * 2020-05-28 2021-12-07 Tdk株式会社 Position detection device, lens module and camera device

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