Drive unit, image acquisition module, and pressure adjustment method

Abstract

Embodiments of the present invention provide a drive device, an image acquisition module, and a voltage regulating method. The drive device for driving a motor of an image acquisition device includes a control module, a drive module, and a voltage regulating unit. The control module is used to acquire displacement information of the image acquisition device, transmit a drive current command to the drive module based on the displacement information, and transmit a voltage regulating signal to the voltage regulating unit based on the displacement information. The drive module is used to generate a drive current based on the drive current command. The voltage regulating unit is used to adjust the voltage input by the power supply to a drive voltage that matches the drive current, and transmit the drive voltage to the drive module, so that the drive module drives the motor with the drive current and drive voltage. The present invention improves energy efficiency by generating a voltage regulating signal to cause the voltage regulating unit to adjust the voltage input by the power supply to a drive voltage that matches the drive current, thereby causing the voltage regulating unit to control the input voltage based on the power required to drive the motor.

Description

Technical Field

[0001] (Cross - reference to related applications) This application claims the priority of a Chinese patent application with application number 202410503100.X and application title "Drive Device, Image Acquisition Module and Voltage Regulation Method", which was filed with the Chinese Patent Office on April 24, 2024. All the contents of the above application are incorporated herein by reference.

[0002] (Technical Field) This application relates to the technical field of optical lens driving, and particularly to a drive device, an image acquisition module and a voltage regulation method.

Background Art

[0003] Currently, many camera modules of portable electronic devices such as commercially available mobile phones and tablets adopt an autofocus system and an optical image stabilization system (also called optical anti - shake) to achieve image stabilization. After determining the displacement amount of focusing or vibration, the camera motor is driven to generate displacement to achieve focusing or compensate for vibration.

[0004] The current methods for driving a camera motor are as follows: One is to change the driving current of the motor to achieve displacement of the camera without changing the driving voltage. However, this method has high power consumption and low energy efficiency. The other is to use the pulse width modulation (PWM) method to harmonize the driving voltage and frequency to drive the motor. However, pulse width modulation introduces a large amount of noise and has low driving accuracy.

[0005] Patent Document 1 discloses a camera module, a control method thereof, and electronic equipment. In Patent Document 1, a motion detection unit (e.g., a gyroscope) generates motion information when jitter occurs in the camera module and transmits the motion information to a microcontroller unit. The microcontroller unit receives the motion information, determines the jitter displacement information of the camera module based on the motion information, and transmits the jitter displacement information to an audio motor control chip. The audio motor control information determines the drive current of the voice coil motor based on the jitter displacement information. The microcontroller unit acquires the drive current of the audio motor transmitted from the audio motor control information as a reference current, determines the drive voltage corresponding to the voice coil motor based on the reference current and a preset resistance corresponding to the voice coil motor, and transmits the drive voltage to a voltage regulating chip. The voltage regulating chip receives the drive voltage and supplies voltage to the voice coil motor based on the drive voltage. Patent Document 1 describes that a microcontrol unit acquires the maximum currents for the X-axis drive current and Y-axis drive current in an audio motor control chip as drive currents, and then determines the drive voltage based on V = I * R (where I is the drive current and R is the preset resistance corresponding to the voice coil motor), and determines the X-axis and Y-axis drive currents based on the jitter displacement information of the X-axis and Y-axis of the voice coil motor and the preset correspondence between jitter displacement and current.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] In view of this, the embodiments of the present application provide a drive device, an image acquisition module, and a pressure adjustment method to at least partially solve the above-mentioned problems. [Means for solving the problem]

[0008] According to a first embodiment of the present invention, a drive device for driving a motor of an image acquisition device is provided, the drive device comprising a control module, a drive module and a pressure regulating unit, the control module is used to acquire displacement information of the image acquisition device, transmit a drive current command to the drive module based on the displacement information and transmit a pressure regulating signal to the pressure regulating unit based on the displacement information, the drive module is used to generate a drive current based on the drive current command, the pressure regulating unit is used to adjust a voltage input by a power supply to a drive voltage that matches the drive current based on the pressure regulating signal and transmit the drive voltage to the drive module, and the drive module is used to drive the motor with the drive current and the drive voltage.

[0009] In one possible implementation, the control module is used to generate a pressure adjustment command for generating the pressure adjustment signal based on the displacement information.

[0010] In one possible embodiment, the drive unit further includes a digital-to-analog converter module, the control module is used to transmit the voltage adjustment command to the digital-to-analog converter module, the digital-to-analog converter module is used to generate the voltage adjustment signal based on the voltage adjustment command and to transmit the voltage adjustment signal to the voltage adjustment unit, so that the voltage adjustment unit adjusts the voltage value of the voltage input by the power supply to the voltage value indicated by the voltage adjustment signal.

[0011] In one possible implementation, the voltage regulating unit is used to adjust the voltage value of the voltage input by the power supply to the voltage value indicated by the voltage regulating signal, based on the voltage regulating signal.

[0012] In one possible implementation, the control module determines a first focus code and a second focus code based on the displacement information, and generates a pressure adjustment command based on the first focus code and the second focus code, wherein a first drive current corresponding to the first focus code is used to drive the motor to move the image acquisition device in the optical axis direction, and a second drive current corresponding to the second focus code is used to drive the motor to move the image acquisition device in the direction perpendicular to the optical axis.

[0013] In one possible implementation, the power supply provides power to the control module through the power supply interface of the control module.

[0014] In one possible implementation, the pressure regulating unit supplies power to the control module via the power supply interface of the control module.

[0015] According to a second embodiment of the present invention, an image acquisition module is provided, comprising a drive device, a displacement information generation device, a motor, and an image acquisition device as described in any one of the first embodiments of the embodiment, wherein the displacement information generation device is used to generate displacement information based on the displacement generated by the image acquisition device and to transmit the displacement information to the drive device, and the motor, after being driven by the drive device, moves the image acquisition device to generate displacement.

[0016] In one possible implementation, the displacement information generation device includes a host device or a gyro sensor, the host device being used to generate displacement information of the image acquisition device based on a plurality of images collected by the image acquisition device, and the gyro sensor being used to convert the movement information of the image acquisition device into an angular quantity and to generate displacement information of the image acquisition device based on the angular quantity, where the movement information of the image acquisition device includes at least the angular velocity of the image acquisition device and the acceleration of the image acquisition device.

[0017] A third embodiment of the present invention provides a voltage adjustment method that includes acquiring displacement information of an image acquisition device, generating a drive current command and a voltage adjustment signal based on the displacement information, generating a drive current based on the drive current command, obtaining a drive voltage by adjusting the voltage input by a power supply based on the voltage adjustment signal, and driving a motor for driving the image acquisition device based on the drive current and the drive voltage that matches the drive current.

[0018] In one possible implementation, the process of generating a pressure adjustment signal based on the displacement information may further include generating a pressure adjustment command based on the displacement information and generating the pressure adjustment signal based on the pressure adjustment command.

[0019] In one possible implementation, the process of generating the pressure adjustment signal based on the pressure adjustment command may further include performing a digital-to-analog conversion on the pressure adjustment command to obtain the pressure adjustment signal.

[0020] In one possible implementation, the process of generating the pressure adjustment signal based on the pressure adjustment command may further include determining the pressure adjustment command as the pressure adjustment signal.

[0021] In one possible implementation, the process of generating a voltage regulation signal based on the displacement information includes determining a first drive current and a second drive current based on the displacement information, and generating the voltage regulation command based on the maximum value of the first drive current and the second drive current. Here, the first drive current is used to drive the motor to move the image acquisition device in the optical axis direction, and the second drive current is used to drive the motor to move the image acquisition device in a direction perpendicular to the optical axis. This may further include the above.

[0022] In one possible implementation, the process of generating a voltage regulation signal based on the displacement information includes determining a first focusing code and a second focusing code based on the displacement information, and generating the voltage regulation command based on the first focusing code and the second focusing code. Here, the first drive current corresponding to the first focusing code is used to drive the motor to move the image acquisition device in the optical axis direction, and the second drive current corresponding to the second focusing code is used to drive the motor to move the image acquisition device in a direction perpendicular to the optical axis. This may further include the above.

Advantages of the Invention

[0023] As can be seen from the above technical solution, the control module generates a drive current command based on the displacement information of the image acquisition device, and the voltage regulation unit further generates a voltage regulation signal for adjusting the voltage input by the power supply to a drive voltage that matches the drive current. In this way, the voltage regulation unit can control the voltage input by the power supply based on the power required for the drive module to actually drive the motor, further reduce power consumption, and improve the energy efficiency ratio.

Brief Description of the Drawings

[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following briefly introduces the attached drawings that need to be used in the description of the embodiments or the prior art. Obviously, the attached drawings in the following description are only some embodiments described in the embodiments of this application, and those skilled in the art can also obtain other attached drawings based on these attached drawings.

[0025] [Figure 1] It is a schematic diagram of an exemplary scene according to an embodiment of this application. [Figure 2] It is a schematic diagram of a driving device according to an embodiment of this application. [Figure 3] It is a schematic diagram of another driving device according to an embodiment of this application. [Figure 4] It is a schematic diagram of a driving device including a motor control chip according to an embodiment of this application. [Figure 5] It is a schematic diagram of a driving device applied to an embodiment of this application. [Figure 6] It is a schematic diagram of another driving device including a motor control chip according to an embodiment of this application. [Figure 7] It is a schematic diagram of yet another driving device applied to an embodiment of this application. [Figure 8] It is a schematic diagram of an image acquisition module according to an embodiment of this application. [Figure 9] It is a step flowchart of a voltage regulation method according to an embodiment of this application.

Modes for Carrying Out the Invention

[0026] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the following clearly and completely describes the technical solutions in the embodiments of this application while combining the attached drawings in the embodiments of this application. Obviously, the described embodiments are some of the embodiments in the embodiments of this application, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in the embodiments of this application should belong to the protection scope of the embodiments of this application.

[0027] The terminology used in this Application is intended solely to describe specific embodiments and is not intended to limit this Application. The singular forms “one,” “the foregoing,” and “this” as used in this Application and the attached claims are also intended to include the plural form unless the context clearly indicates otherwise. Furthermore, the term “and / or” as used herein means, and includes, any or all possible combinations of one or more related listed items.

[0028] While this application may use terms such as "first," "second," and "third" to describe various types of information, this information should not be limited to these terms. These terms are used solely to distinguish information of the same type. For example, within the scope of this application, first information may be called second information, and similarly, second information may be called first information. Depending on the context, for example, "if" used here may be interpreted as "at the time of," "when," or "in response to a decision."

[0029] Figure 1 is a schematic diagram of an exemplary scene according to an embodiment of the present invention. As shown in Figure 1, the exemplary scene is an automatic optical focusing or optical image stabilization (also called optical image stabilization) method used in currently available portable electronic devices such as mobile phones and tablets. In this exemplary scene, when camera displacement occurs, the automatic focusing and / or optical image stabilization camera module determines the displacement information for focusing or stabilization, inputs the displacement information to a microcontroller unit (MCU), outputs drive information to a camera motor control chip, the camera motor control chip uses a fixed drive voltage supplied from an external power supply as the operating voltage and generates a drive current based on the drive information, and further operates the camera motor based on the drive current and drive voltage. The driven camera motor displaces the connected camera while in operation, thereby realizing automatic optical focusing and optical image stabilization.

[0030] However, in the example scene, when a camera motor drives the camera and generates displacement, the drive current of the camera motor correlates linearly with the amount of displacement. However, in most cases, the focusing displacement and vibration are small, so the amount of displacement required for the camera motor to drive the camera is small, and the required drive current and drive voltage are relatively small. However, the drive voltage input from the external power supply is a constant high voltage, and since the drive voltage exceeds the voltage range required for the camera motor, power consumption increases and energy efficiency is low.

[0031] In the example scene, to solve the problem of low energy efficiency, pulse width modulation (PWM) is employed. The current solution is to improve energy efficiency by harmonizing and changing the drive voltage based on the load on the camera motor, thereby reducing the power consumption required to displace the camera. However, pulse width modulation introduces significant noise and leads to problems with reduced drive accuracy.

[0032] Therefore, in order to solve the above problem, this application proposes a drive device, an image acquisition module, and a pressure adjustment method.

[0033] (Example 1) Figure 2 is a schematic diagram of a drive device according to an embodiment of the present invention. As shown in Figure 2, the drive device 100 for the motor 300 for driving the image acquisition device 200 includes a control module 101, a drive module 102, and a pressure regulating unit 103. The control module 101 is used to acquire displacement information of the image acquisition device 200, transmit a drive current command to the drive module based on the displacement information, and transmit a pressure regulating signal to the pressure regulating unit 103 based on the displacement information. The drive module 102 is used to generate a drive current based on the drive current command. The pressure regulating unit 103 is used to adjust the voltage input by the power supply 400 to a drive voltage that matches the drive current based on the pressure regulating signal, and transmit the drive voltage to the drive module 102, so that the drive module 102 drives the motor 300 with the drive current and drive voltage.

[0034] To control the drive voltage, the control module 101 first acquires displacement information from the image acquisition device 200. The image acquisition device 200 may be a camera or other device for acquiring images, and the displacement information from the image acquisition device 200 may be generated by a higher-level device based on multiple images acquired by the image acquisition device 200, or it may be generated by a gyro sensor based on data when the image acquisition device 200 is displaced. The control module 101 generates a drive current command and a voltage adjustment signal based on the acquired displacement information. In one feasible configuration, the control module 101 can also generate a voltage adjustment command to generate the voltage adjustment signal based on the displacement information. The control module 101 transmits a drive current command to the drive module 102, and the drive current instructed by the drive current command is the current required for the motor 300 to move the image acquisition device 200 and generate displacement corresponding to the displacement information, and transmits a voltage adjustment signal to the voltage adjustment unit 103, which may be a high-efficiency power management chip such as a DC-to-DC converter (DCDC) power supply chip or a switch power supply, and based on the received voltage adjustment signal, the voltage adjustment unit 103 adjusts the voltage input by the power supply 400 to a drive voltage that matches the drive current, and then transmits the drive voltage to the drive module 102, after which the drive module 102 drives the motor 300 with the drive current and drive voltage, and after being driven, the motor 300 moves the image acquisition device 200 to generate the corresponding displacement, thereby realizing automatic focusing and / or optical vibration isolation.

[0035] In the embodiment of the present invention, the control module 101 generates a drive current command based on the displacement information of the image acquisition device 200, and further generates a voltage adjustment signal to cause the voltage adjustment unit 103 to adjust the voltage input by the power supply 400 to a drive voltage that matches the drive current. As a result, the voltage adjustment unit 103 can control the voltage input by the power supply 400 based on the power required for the drive module 102 to actually drive the motor 300, thereby further reducing power consumption and improving the energy efficiency ratio.

[0036] (Example 2) Based on Embodiment 1, the control module 101 can be used to determine a first drive current and a second drive current based on displacement information, and to generate a pressure adjustment command based on the maximum value of the first drive current and the second drive current, where the first drive current is used to drive the motor 300 to move the image acquisition device 200 in the optical axis direction, and the second drive current is used to drive the motor 300 to move the image acquisition device 200 in the direction perpendicular to the optical axis.

[0037] Any displacement generated by the image acquisition device 200 can be divided into the sum of the displacement due to movement in the optical axis direction and the displacement due to movement perpendicular to the optical axis. Since the motor 300 needs to move the image acquisition device 200 to offset the displacement generated by the image acquisition device 200, it is necessary to first calculate the first drive current ix_driver required for the motor 300 to drive the image acquisition device 200 to move in the optical axis direction, and the second drive current iy_driver required for the motor 300 to drive the image acquisition device 200 to move perpendicular to the optical axis. Furthermore, since the first drive current ix_driver and the second drive current iy_driver required to drive the image acquisition device 200 may be different, the drive power required for the motor 300 must be based on the maximum value of the drive power in the two directions. That is, it is necessary to select the maximum value of ix_driver and iy_driver as the drive current and generate a voltage adjustment command.

[0038] In some cases, the displacement generated by the image acquisition device 200 may be very small, resulting in both the calculated ix_driver and iy_driver being small, and thus the calculated required drive voltage being small. In such cases, it is necessary to refer to the normal operating voltage of the motor 300. If the required drive voltage is smaller than the normal operating voltage of the motor 300, the control module 101 will use the normal operating voltage of the motor 300 as the required drive voltage and generate a voltage adjustment command based on the normal operating voltage of the motor 300.

[0039] In the embodiment of the present invention, the control module 101 generates a voltage adjustment command based on the first drive current and the second drive current, ultimately providing the drive voltage to the motor 300 more accurately and further improving the energy efficiency ratio. At the same time, if the drive voltage required for the motor 300 is low, the voltage adjustment command can be generated based on the normal operating voltage of the motor 300 to ensure the normal operation of the motor 300.

[0040] (Example 3) Based on Embodiment 1, the control module 101 can be used to determine a first focus code and a second focus code based on displacement information, and to generate a pressure adjustment command based on the first focus code and the second focus code, where a first drive current corresponding to the first focus code is used to drive the motor 300 to move the image acquisition device 200 in the optical axis direction, and a second drive current corresponding to the second focus code is used to drive the motor 300 to move the image acquisition device 200 in the direction perpendicular to the optical axis.

[0041] The control module 101 can generate a pressure adjustment command not only based on the drive current, but also based on the focus code. Specifically, when the control module 101 generates a pressure adjustment command, it first needs to calculate the drive current ix_driver required for the motor 300 to drive the image acquisition device 200 to move in the optical axis direction, and the drive current iy_driver required for the motor 300 to drive the image acquisition device 200 to move in the direction perpendicular to the optical axis. Then, it determines a first focus code and a second focus code corresponding to ix_driver and iy_driver, and further determines an N-bit focus code based on the first and second focus codes, and generates a pressure adjustment command based on the N-bit focus code. Here, N is a positive integer.

[0042] In the embodiment of the present invention, the control module 101 generates a voltage adjustment command based on a first focus code and a second focus code, which ultimately allows for more accurate delivery of the drive voltage to the motor 300 and further improves the energy efficiency ratio.

[0043] (Example 4) Based on any of the embodiments from Examples 1 to 3, the drive unit 100 further includes a digital-to-analog conversion module 104, as shown in Figure 3.

[0044] The control module 101 is used to transmit a voltage adjustment command to the digital-to-analog conversion module 104. The digital-to-analog conversion module 104 is used to generate a voltage adjustment signal based on the voltage adjustment command and to transmit the voltage adjustment signal to the voltage adjustment unit 103, so that the voltage adjustment unit 103 adjusts the voltage value of the voltage input by the power supply 400 to the voltage value indicated by the voltage adjustment signal.

[0045] When performing automatic focusing or optical image stabilization, the control module 101 first acquires displacement information of the image acquisition device 200, then generates a drive current command based on the displacement information and transmits it to the drive module 102. The drive current instructed by the drive current command is the current required for the motor 300 to drive the image acquisition device 200 and generate displacement corresponding to the displacement information. Simultaneously, the control module 101 transmits a voltage adjustment command to the digital-to-analog conversion module 104 based on the displacement information. The digital-to-analog conversion module 104 generates a voltage adjustment signal based on the voltage adjustment command and transmits it to the voltage adjustment unit 103. For example, the voltage adjustment signal may be an analog voltage, and the analog voltage matches the drive current instructed by the drive current command. The voltage adjustment unit 103 adjusts the voltage input by the power supply 400 based on the analog voltage to a drive voltage that matches the drive current instructed by the drive current command, and transmits the drive voltage to the drive module 102. The drive module 102 generates a drive current based on a drive current command, then drives the motor 300 with the drive current and drive voltage, causing the motor 300 to drive the image acquisition device 200 to generate displacement in relation to the displacement information.

[0046] In this invention, by providing a digital-to-analog conversion module 104 in the drive unit 100, the voltage adjustment unit 103 can adjust the voltage input by the power supply 400 without having a digital-to-analog conversion function, thereby improving the voltage adjustment efficiency of the voltage adjustment unit 103.

[0047] (Example 5) Based on any of the embodiments from Examples 1 to 3, the pressure regulating unit 103 can be used to adjust the voltage value of the voltage input by the power supply 400 to the voltage value indicated by the pressure regulating signal.

[0048] The voltage regulating unit 103 may be a high-efficiency power management chip with digital communication capabilities, for example, a DC-to-DC converter (DCDC) power supply chip with digital communication capabilities, so that it can directly adjust the voltage input by the power supply 400 based on the voltage regulating signal. Specifically, the voltage regulating unit 103 can adjust the voltage input by the power supply 400 based on the analog voltage to a drive voltage that matches the drive current instructed by the drive current command.

[0049] In the embodiment of the present invention, the pressure adjustment unit 103 can directly adjust the voltage input by the power supply 400 based on the pressure adjustment signal, thereby reducing the data processing pressure of the control module 101 and further improving the processing efficiency of the control module 101.

[0050] (Example 6) Based on any of the embodiments from Examples 1 to 5, as shown in Figure 4, the control module 101 and the drive module 102 in the drive unit 100 may be provided on the motor control chip 110, enabling external connection between the pressure regulating unit 103 and the motor control chip. The control module 101 and the drive module 102 are provided separately from the pressure regulating unit 103.

[0051] In the embodiment of the present invention, since the pressure regulating unit 103 is a unit that adjusts the voltage input by the power supply 400, it is clear that it generates heat when operating and has a relatively high temperature. Since the control module 101 and the drive module 102 are not integrally provided with the pressure regulating unit 103, the motor control chip 110 is not affected by the heat generated by the pressure regulating unit 103, the operating temperature of the motor control chip 110 is reduced, and the operating accuracy of the motor control chip 110 is further improved. Also, when constructing the image acquisition module, since the motor control chip 110 and the pressure regulating unit 103 are not integrally provided, the pressure regulating unit 103 may be selectively provided inside or outside the image acquisition module as needed. When the pressure regulating unit 103 is provided outside the image acquisition module, the physical area occupied by the constructed image acquisition module can be reduced.

[0052] For example, as shown in Figure 5, the control module 101 may be a microcontroller unit (MCU), the drive module 102 may be an H_DRIVER driver, and the pressure adjustment unit 103 may be a DC-DC converter with digital communication capabilities. The MCU and H_DRIVER are provided on the motor control chip 110. The MCU sends a pressure adjustment signal to the DC-DC converter, which is a pressure adjustment command. The DC-DC converter then adjusts the voltage VCC input by the power management unit (PMU) to the drive voltage based on the pressure adjustment command. The H_DRIVER then generates a drive current based on the drive current command sent by the MCU, and the H_DRIVER drives the motor based on the drive current and drive voltage.

[0053] (Example 7) Based on any of the embodiments from Examples 1 to 5, the drive unit 100 may include one motor control chip 120, as shown in Figure 6, and the control module 101, drive module 102, and pressure regulating unit 103 are integrated inside the motor control chip 120. The control module 101, drive module 102, and pressure regulating unit 103 are integrated and provided together.

[0054] In the embodiment of the present invention, when the control module 101, drive module 102, and pressure regulating unit 103 are provided integrally, if the pressure regulating unit 103 is provided outside the motor control chip 120, off-chip communication resources are occupied, package costs and peripheral circuit area increase, and application complexity increases. By providing them integrally, off-chip communication resources are released, package costs are reduced, peripheral circuit area decreases, and application complexity decreases.

[0055] For example, as shown in Figure 7, the control module 101 may be a microcontroller unit (MCU), the drive module 102 may be an H_DRIVER driver, and the pressure adjustment unit 103 may be a DC-DC converter without digital communication capabilities. The MCU, H_DRIVER, and DC-DC converter are all located on the motor control chip 120. Since the DC-DC converter does not have digital communication capabilities, it cannot recognize the pressure adjustment command transmitted by the MCU. Therefore, the motor control chip 120 can be equipped with a digital-to-analog converter (DAC). The DAC converts the pressure adjustment command transmitted by the MCU into an analog voltage, determines the analog voltage as a pressure adjustment signal and transmits it to the DC-DC converter. The DC-DC converter then adjusts the voltage VCC input by the power management unit (PMU) to the drive voltage indicated by the analog voltage based on the analog voltage. Subsequently, the H_DRIVER generates a drive current based on the drive current command transmitted by the MCU, and the H_DRIVER drives the motor based on the drive current and drive voltage.

[0056] (Example 8) Based on any of the embodiments from Example 1 to Example 7, the power supply 400 can supply power to the control module 101 via the power supply interface of the control module 101.

[0057] When the pressure regulating unit 103 transmits the drive voltage to the drive module 102 and supplies power to the drive module 102, the operating voltage of the control module 101 may also be provided by the power supply 400, which applies to dual power supply scenes. For example, if the control module 101 is an integrated optical image stabilization (OIS) control driver chip, the power supply 400 supplies power to the integrated OIS control driver chip via the power supply interface of the integrated OIS control driver chip.

[0058] In this embodiment, the control module 101 is powered by the power supply 400 and can be applied to dual power supply scenarios.

[0059] (Example 9) Based on any of the embodiments from Example 1 to Example 7, the pressure regulating unit 103 can supply power to the control module 101 via the power supply interface of the control module 101.

[0060] The operating voltage of the control module 101 may also be provided by the voltage regulating unit 103, and in single-power supply scenes, for example, when the control module 101 is a separate optical image stabilization (OIS) control driver chip or an open-loop / closed-loop auto focus (AF) camera motor control chip, the voltage regulating unit 103 is powered by the power supply interface.

[0061] Furthermore, when the operating voltage of the control module 101 is provided by the voltage regulating unit 103, the drive current generated by the control module 101 includes the current that drives the motor 300 and the current that drives the operation of the control module 101. At this time, the drive voltage obtained by adjusting the voltage regulating unit 103 includes the voltage that drives the motor 300 and the voltage that drives the operation of the control module 101.

[0062] In this embodiment, the control module 101 is powered by the pressure regulating unit 103, and can be applied to single-power supply scenarios.

[0063] (Example 10) Figure 8 is a schematic diagram of an image acquisition module according to an embodiment of the present application. As shown in Figure 8, the image acquisition module 500 includes a displacement information generation device 501, a drive device 100 in any of the above embodiments, a motor 300, and an image acquisition device 200. The displacement information generation device 501 is used to generate displacement information based on the displacement generated by the image acquisition device 200 and to transmit the displacement information to the drive device 100. The motor 300 is driven by the drive device 100 and then moves the image acquisition device 200 to generate displacement.

[0064] The displacement information generation device 501 may be a host device or a gyro sensor. When the displacement information generation device 501 is a host device, it generates displacement information of the image acquisition device 200 based on multiple images acquired by the image acquisition device 200. The specific displacement information may be obtained by comparing the offset values ​​of feature points in the multiple images. When the displacement information generation device 501 is a gyro sensor, it generates displacement information of the image acquisition device based on the movement data of the image acquisition device. Here, the movement information of the image acquisition device may include the angular velocity and acceleration of the image acquisition device. A gyro sensor is a single motion sensor. Common gyro sensors include 3-axis gyro sensors and 6-axis gyro sensors. A 3-axis gyro sensor can detect angular velocity in three directions, while a 6-axis gyro sensor adds 3-directional accelerometers to a 3-axis gyro sensor, allowing it to detect acceleration in three directions. To reduce costs, a 3-axis gyro sensor can be selected, and to improve the accuracy of displacement information acquisition by the image acquisition device 200, a 6-axis gyro sensor can be selected, allowing for a more comprehensive reflection of the movement state and orientation of the image acquisition device 200.

[0065] In the embodiment of the present invention, the drive device 100 generates a drive current based on displacement information generated by the displacement information generation device 501, and further controls the voltage input by the power supply 400 based on the power required to actually drive the motor 300, thereby further reducing power consumption and improving the energy efficiency ratio.

[0066] (Example 11) Figure 9 is a step flowchart of the pressure regulation method according to an embodiment of the present invention. As shown in Figure 9, the pressure regulation method includes the following steps.

[0067] Step 801: Obtain displacement information from the image acquisition device.

[0068] To control the drive voltage, first, displacement information of the image acquisition device is acquired. The image acquisition device 200 may be a camera or other device for acquiring images, and the displacement information of the image acquisition device may be generated by a higher-level device based on multiple images acquired by the image acquisition device, or it may be generated by a gyro sensor based on data when the image acquisition device is displaced.

[0069] Step 802: Generate drive current commands and voltage regulation signals based on displacement information.

[0070] Specifically, the process of generating a pressure adjustment signal based on a pressure adjustment command may further include generating a pressure adjustment command based on the displacement information and generating the pressure adjustment signal based on the pressure adjustment command.

[0071] Step 803: Generate the drive current based on the drive current command.

[0072] Step 804: Based on the voltage adjustment signal, the voltage input by the power supply is adjusted to obtain the drive voltage.

[0073] Step 805: Drive the motor based on the drive current and drive voltage.

[0074] Based on the acquired displacement information, the system generates the necessary drive current and voltage adjustment signal, adjusts the voltage input by the power supply to a drive voltage that matches the drive current, and drives the motor with the drive current and drive voltage. After the motor is driven, it moves the image acquisition device to generate the corresponding displacement, thereby achieving automatic focusing and / or optical vibration isolation.

[0075] In the embodiment of this invention, a drive current command is generated based on displacement information of the image acquisition device, and a voltage adjustment signal is further generated to adjust the voltage input by the power supply to a drive voltage that matches the drive current. This makes it possible to control the voltage input by the power supply based on the power required to actually drive the motor, further reducing power consumption and improving the energy efficiency ratio.

[0076] (Example 12) Based on Example 11, the process for generating a pressure regulation signal based on a pressure regulation command may further include performing a digital-to-analog conversion on the pressure regulation command to obtain a pressure regulation signal.

[0077] In the embodiment of this invention, by performing digital-to-analog conversion on the pressure adjustment command, the analog voltage can be adjusted as a pressure adjustment signal during pressure adjustment, thereby improving pressure adjustment efficiency.

[0078] (Example 13) Based on Example 11, the process for generating a pressure regulation signal based on a pressure regulation command may further include determining the pressure regulation command as the pressure regulation signal.

[0079] In the embodiment of the present invention, the efficiency of generating the pressure adjustment signal can be improved by directly determining the pressure adjustment command as the pressure adjustment signal.

[0080] (Example 14) Based on Example 11, the process for generating a pressure adjustment signal based on displacement information may further include determining a first drive current and a second drive current based on the displacement information, and generating a pressure adjustment command based on the maximum value of the first drive current and the second drive current.

[0081] Any displacement generated by the image acquisition device can be divided into the sum of the displacement due to movement in the optical axis direction and the displacement due to movement perpendicular to the optical axis. Since the motor needs to move the image acquisition device to offset the displacement generated by the image acquisition device, it is first necessary to calculate the first drive current ix_driver required for the motor to drive the image acquisition device in the optical axis direction, and the second drive current iy_driver required for the motor to drive the image acquisition device in the perpendicular to the optical axis. Furthermore, since the first drive current ix_driver and the second drive current iy_driver required to drive the image acquisition device may differ, the drive power required for the motor must be based on the maximum value of the drive power in the two directions. That is, the maximum value of ix_driver and iy_driver must be selected as the drive current to generate a voltage adjustment command. Subsequently, the required drive voltage is calculated based on the drive current and the motor's resistance value, and a voltage adjustment command is generated based on the required drive voltage.

[0082] In some cases, the displacement generated by the image acquisition device may be very small, resulting in both the calculated ix_driver and iy_driver being small, and thus the calculated required drive voltage being small. In such cases, it is necessary to refer to the motor's normal operating voltage. If the required drive voltage is smaller than the motor's normal operating voltage, the motor's normal operating voltage is used as the required drive voltage, and a voltage adjustment command is generated based on the motor's normal operating voltage.

[0083] In the embodiments of this invention, a voltage adjustment command is generated based on the first and second drive currents, ultimately providing the motor with a more accurate drive voltage and further improving the energy efficiency ratio. At the same time, when the drive voltage required for the motor is low, a voltage adjustment command can be generated based on the motor's normal operating voltage to ensure the motor operates normally.

[0084] (Example 15) Based on Example 11, the process for generating a pressure adjustment signal based on displacement information may further include determining a first focus code and a second focus code based on the displacement information, and generating a pressure adjustment command based on the first focus code and the second focus code.

[0085] In addition to generating a pressure adjustment command based on the drive current, it is also possible to generate a pressure adjustment command based on the focus code. Specifically, when generating a pressure adjustment command, it is first necessary to calculate the drive current ix_driver required for the motor to drive the image acquisition device to move in the optical axis direction, and the drive current iy_driver required for the motor to drive the image acquisition device to move in the direction perpendicular to the optical axis. Then, a first focus code and a second focus code corresponding to ix_driver and iy_driver are determined, and further, an N-bit focus code is determined based on the first and second focus codes, and a pressure adjustment command is generated based on the N-bit focus code. Here, N is a positive integer.

[0086] In the embodiment of the present invention, a voltage adjustment command is generated based on a first focus code and a second focus code, which ultimately allows for more accurate delivery of the drive voltage to the motor and further improves the energy efficiency ratio.

[0087] Furthermore, each embodiment and / or the technical features described in this application may be arbitrarily combined with each other, provided that they do not conflict, and the technical solutions obtained after such combination should also be included in the scope of protection of this application.

[0088] The specific examples in the embodiments of this application are provided to help those skilled in the art better understand the embodiments of this application, and do not limit the scope of the embodiments. Those skilled in the art can make various improvements and modifications based on the above embodiments, and it should be understood that all such improvements and modifications fall within the scope of protection of this application.

[0089] The above description represents only specific embodiments of the present application, and the scope of protection is not limited thereto. Any person skilled in the art can easily conceive of any variation or substitution within the technical scope presented herein, and such variations should fall within the scope of protection. Therefore, the scope of protection should be based on the scope of protection of the claims.

[0090] (Note) (Note 1) A drive device for driving a motor of an image acquisition device, wherein the drive device includes a control module, a drive module and a pressure regulating unit, the control module and the drive module are provided on the same chip, and the pressure regulating unit supplies power to the control module via the power supply interface of the control module. The control module is used to acquire displacement information of the image acquisition device, transmit a drive current command to the drive module based on the displacement information, and transmit a pressure adjustment signal to the pressure adjustment unit based on the displacement information. The drive module is used to generate a drive current based on the drive current command, The pressure adjustment unit is used to adjust the voltage input by the power supply to a drive voltage that matches the drive current based on the pressure adjustment signal, transmit the drive voltage to the drive module, supply power to the drive module, and cause the drive module to drive the motor with the drive current and the drive voltage, the displacement information includes at least X-axis displacement information and Y-axis displacement information, and accordingly, the control module is used to generate a pressure adjustment command for generating the pressure adjustment signal based on the X-axis displacement information and the Y-axis displacement information, The control module is also used to determine a first focus code and a second focus code based on the X-axis displacement information and the Y-axis displacement information, and to generate the pressure adjustment command based on the first focus code and the second focus code, wherein a first drive current corresponding to the first focus code is used to drive the motor to move the image acquisition device in the optical axis direction, and a second drive current corresponding to the second focus code is used to drive the motor to move the image acquisition device in the direction perpendicular to the optical axis.

[0091] (Note 2) The drive device further includes a digital-to-analog conversion module, The control module is used to transmit the pressure adjustment command to the digital-to-analog conversion module. The apparatus according to Appendix 1, characterized in that the digital-to-analog conversion module generates the pressure adjustment signal based on the pressure adjustment command, transmits the pressure adjustment signal to the pressure adjustment unit, and is used to adjust the voltage value of the voltage input by the power supply to the voltage value indicated by the pressure adjustment signal.

[0092] (Note 3) The apparatus according to Appendix 1, characterized in that the pressure adjustment unit is used to adjust the voltage value of the voltage input by the power supply to the voltage value indicated by the pressure adjustment signal.

[0093] (Note 4) The device includes a displacement information generation device, a drive device described in any one of the appendices 1 to 3, a motor, and an image acquisition device. The displacement information generation device is used to generate displacement information based on the displacement generated by the image acquisition device and to transmit the displacement information to the drive device. The image acquisition module is characterized in that the motor, after being driven by the drive device, moves and displaces the image acquisition device.

[0094] (Note 5) The displacement information generation device includes a higher-level device or a gyro sensor. The aforementioned higher-level device is used to generate displacement information of the image acquisition device based on a plurality of images acquired by the image acquisition device. The image acquisition module according to Appendix 4, characterized in that the gyro sensor is used to convert the movement information of the image acquisition device into an angular quantity and to generate displacement information of the image acquisition device based on the angular quantity, wherein the movement information of the image acquisition device includes at least the angular velocity of the image acquisition device and the acceleration of the image acquisition device.

[0095] (Note 6) A pressure adjustment method applied to a drive device described in any one of the appendices 1 to 3, wherein the method involves acquiring displacement information of an image acquisition device, A drive current command is generated based on the displacement information, which includes at least X-axis displacement information and Y-axis displacement information. A pressure adjustment command is generated based on the X-axis displacement information and the Y-axis displacement information, To generate the pressure adjustment signal based on the pressure adjustment command, To generate a drive current based on the aforementioned drive current command, Based on the aforementioned voltage adjustment signal, the voltage input by the power supply is adjusted to obtain the drive voltage, The motor for driving the image acquisition device is driven based on the aforementioned drive current and the drive voltage that matches the aforementioned drive current. Based on the X-axis displacement information and the Y-axis displacement information, a first focus code and a second focus code are determined. A pressure adjustment method characterized by generating a pressure adjustment command based on the first focus code and the second focus code, wherein a first drive current corresponding to the first focus code is used to drive the motor to move the image acquisition device in the optical axis direction, and a second drive current corresponding to the second focus code is used to drive the motor to move the image acquisition device in the direction perpendicular to the optical axis.

[0096] (Note 7) The method according to Appendix 6, characterized in that generating the pressure adjustment signal based on the pressure adjustment command includes performing a digital-to-analog conversion on the pressure adjustment command to obtain the pressure adjustment signal.

[0097] (Note 8) The method according to Appendix 6, characterized in that generating the pressure adjustment signal based on the pressure adjustment command includes determining the pressure adjustment command to be the pressure adjustment signal.

Claims

1. A drive device for driving a motor of an image acquisition device, wherein the drive device includes a control module, a drive module and a pressure regulating unit, the control module and the drive module are provided on the same chip, and the pressure regulating unit supplies power to the control module via the power supply interface of the control module. The control module is used to acquire displacement information of the image acquisition device, transmit a drive current command to the drive module based on the displacement information, and transmit a pressure adjustment signal to the pressure adjustment unit based on the displacement information. The drive module is used to generate a drive current based on the drive current command, The pressure adjustment unit is used to adjust the voltage input by the power supply to a drive voltage that matches the drive current based on the pressure adjustment signal, transmit the drive voltage to the drive module, supply power to the drive module, and cause the drive module to drive the motor with the drive current and the drive voltage, the displacement information includes at least optical axis direction displacement information and optical axis perpendicular direction displacement information, and accordingly, the control module is used to generate a pressure adjustment command for generating the pressure adjustment signal based on the optical axis direction displacement information and the optical axis perpendicular direction displacement information. The control module is also used to determine a first focus code and a second focus code based on the optical axis direction displacement information and the optical axis perpendicular direction displacement information, and to generate the pressure adjustment command based on the first focus code and the second focus code, wherein a first drive current corresponding to the first focus code is used to drive the motor to move the image acquisition device in the optical axis direction, and a second drive current corresponding to the second focus code is used to drive the motor to move the image acquisition device in the optical axis perpendicular direction.

2. The drive device further includes a digital-to-analog conversion module, The control module is used to transmit the pressure adjustment command to the digital-to-analog conversion module. The apparatus according to claim 1, wherein the digital-to-analog conversion module is used to generate the pressure adjustment signal based on the pressure adjustment command, transmit the pressure adjustment signal to the pressure adjustment unit, and cause the pressure adjustment unit to adjust the voltage value of the voltage input by the power supply to the voltage value indicated by the pressure adjustment signal.

3. The apparatus according to claim 1, characterized in that the pressure adjustment unit is used to adjust the voltage value of the voltage input by the power supply to the voltage value indicated by the pressure adjustment signal.

4. Displacement information generation device, including a drive device, motor and image acquisition device according to any one of claims 1 to 3, The displacement information generation device is used to generate displacement information based on the displacement generated by the image acquisition device and to transmit the displacement information to the drive device. The image acquisition module is characterized in that the motor, after being driven by the drive device, moves and displaces the image acquisition device.

5. The displacement information generation device includes a higher-level device or a gyro sensor. The aforementioned higher-level device is used to generate displacement information of the image acquisition device based on a plurality of images acquired by the image acquisition device. The gyro sensor is used to convert the movement information of the image acquisition device into an angular quantity and to generate displacement information of the image acquisition device based on the angular quantity, wherein the movement information of the image acquisition device includes at least the angular velocity of the image acquisition device and the acceleration of the image acquisition device, as described in claim 4.

6. A pressure adjustment method applied to a drive device according to any one of claims 1 to 3, wherein the method includes acquiring displacement information of an image acquisition device, A drive current command is generated based on the displacement information, which includes at least optical axis displacement information and optical axis perpendicular displacement information. A pressure adjustment command is generated based on the optical axis displacement information and the optical axis vertical displacement information, To generate the pressure adjustment signal based on the pressure adjustment command, To generate a drive current based on the aforementioned drive current command, Based on the aforementioned voltage adjustment signal, the voltage input by the power supply is adjusted to obtain the drive voltage, The motor for driving the image acquisition device is driven based on the aforementioned drive current and the drive voltage that matches the aforementioned drive current. Based on the optical axis direction displacement information and the optical axis perpendicular direction displacement information, a first focus code and a second focus code are determined. A pressure adjustment method characterized by generating a pressure adjustment command based on the first focus code and the second focus code, wherein a first drive current corresponding to the first focus code is used to drive the motor to move the image acquisition device in the optical axis direction, and a second drive current corresponding to the second focus code is used to drive the motor to move the image acquisition device in the direction perpendicular to the optical axis.

7. The method according to 6, characterized in that generating the pressure adjustment signal based on the pressure adjustment command includes performing a digital-to-analog conversion on the pressure adjustment command to obtain the pressure adjustment signal.

8. The method according to 6, characterized in that generating the pressure adjustment signal based on the pressure adjustment command includes determining the pressure adjustment command to be the pressure adjustment signal.

Images