CN114114589B - Camera module with focusing, anti-shake and optical axis correcting functions - Google Patents

Camera module with focusing, anti-shake and optical axis correcting functions Download PDF

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Publication number
CN114114589B
CN114114589B CN202010886291.4A CN202010886291A CN114114589B CN 114114589 B CN114114589 B CN 114114589B CN 202010886291 A CN202010886291 A CN 202010886291A CN 114114589 B CN114114589 B CN 114114589B
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China
Prior art keywords
coil
bearing seat
optical axis
camera module
magnet
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Active
Application number
CN202010886291.4A
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Chinese (zh)
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CN114114589A (en
Inventor
戎琦
袁栋立
刘佳
刘傅文
陈卓
俞丝丝
赵金军
卞强龙
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Ningbo Sunny Opotech Co Ltd
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Ningbo Sunny Opotech Co Ltd
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Priority to CN202010886291.4A priority Critical patent/CN114114589B/en
Priority to PCT/CN2021/105976 priority patent/WO2022042094A1/en
Publication of CN114114589A publication Critical patent/CN114114589A/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image
    • G02B27/646—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image compensating for small deviations, e.g. due to vibration or shake
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
    • G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
    • G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
    • 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

Abstract

The invention relates to a camera module, which comprises: a lens assembly; a first bearing seat; the second bearing seat is positioned at the outer side of the first bearing seat and is elastically connected with the first bearing seat; the fixing component is positioned at the outer side of the second bearing seat and is elastically connected with the second bearing seat; the first driving element is arranged between the first bearing seat and the second bearing seat and is suitable for driving the first bearing seat to move along the optical axis direction relative to the second bearing seat; and the second driving element is arranged between the second bearing seat and the fixed part and is suitable for driving the second bearing seat to rotate around a radial shaft relative to the fixed part, wherein the second bearing seat is provided with a reference surface vertical to the optical axis, and the radial shaft is a virtual axis on the reference surface. The invention also provides a corresponding method for correcting the optical axis inclination. The optical axis can be corrected, and the fact that the lens is hindered by the driving forces in the two directions to cause crosstalk is prevented.

Description

Camera module with focusing, anti-shake and optical axis correcting functions
Technical Field
The present application relates to an optical technology, and more particularly, to a camera module having functions of focusing, anti-shake, and optical axis correction.
Background
With the popularization of mobile electronic devices, technologies related to camera modules (for acquiring images, such as videos or images) applied to mobile electronic devices have been rapidly developed and advanced, and in recent years, camera modules have been widely applied to various fields, such as medical treatment, security, industrial production, and the like. In order to meet the increasingly wide market demands, the characteristics of the camera module, such as high pixel and high frame rate, are the irreversible development trend of the existing camera module.
Along with the promotion of the demand of shooing of cell-phone, the module pixel of making a video recording is bigger and bigger, sensitization chip area is bigger and bigger, leads to the also corresponding increase of size of whole camera lens module, and camera lens module size increase leads to in the assembling process that camera lens optical axis slope problem is serious, solves the optical axis slope problem and is especially outstanding urgent demand.
Disclosure of Invention
An object of the present invention is to overcome the disadvantages of the prior art and to provide a solution for a camera module with functions of focusing, anti-shake and correcting optical axis.
In order to solve the above technical problem, the present invention provides a camera module, which includes: the lens assembly is provided with an optical axis; the lens assembly is arranged on the first bearing seat; the second bearing seat is positioned at the outer side of the first bearing seat, and the first bearing seat is elastically connected with the second bearing seat; the fixing component is positioned at the outer side of the second bearing seat, and the second bearing seat is elastically connected with the fixing component; the first driving element is arranged between the first bearing seat and the second bearing seat and is suitable for driving the first bearing seat to move along the optical axis direction relative to the second bearing seat; and the second driving element is arranged between the second bearing seat and the fixed part and is suitable for driving the second bearing seat to rotate around a radial shaft relative to the fixed part, wherein the second bearing seat is provided with a reference surface vertical to the optical axis, and the radial shaft is a virtual axis on the reference surface.
The first driving element comprises a coil arranged on the outer side face of the first bearing seat and a magnet arranged on the inner side face of the second bearing seat.
The second driving element comprises a coil arranged on the outer side surface of the second bearing seat and a magnet arranged on the inner side surface of the fixing part.
The outer side surface of the first bearing seat is provided with a first coil containing hole and a second coil containing hole which are symmetrical about an optical axis, and a first coil and a second coil are respectively arranged in the first coil containing hole and the second coil containing hole; the medial surface that the second bore the weight of the seat set up with first magnetite holding hole that first coil holding hole corresponds and with the second magnetite holding hole that second coil holding hole corresponds, set up in the first magnetite holding hole can with first coil interact's first magnetite, set up in the second magnetite holding hole can with second coil interact's second magnetite.
Wherein a third coil accommodating hole, a fourth coil accommodating hole, a fifth coil accommodating hole and a sixth coil accommodating hole are formed in the outer side surface of the second bearing seat, the third coil accommodating hole and the fifth coil accommodating hole are symmetrical with respect to the optical axis, the fourth coil accommodating hole and the sixth coil accommodating hole are symmetrical with respect to the optical axis, and a third coil, a fourth coil, a fifth coil and a sixth coil are respectively formed in the third coil accommodating hole, the fourth coil accommodating hole, the fifth coil accommodating hole and the sixth coil accommodating hole; the inner side surface of the fixing part is provided with a third magnet containing hole corresponding to the third coil containing hole, a fourth magnet containing hole corresponding to the fourth coil containing hole, a fifth magnet containing hole corresponding to the fifth magnet containing hole and a sixth magnet containing hole corresponding to the sixth coil containing hole, a third magnet capable of interacting with the third coil is arranged in the third magnet containing hole, a fourth magnet capable of interacting with the fourth coil is arranged in the fourth magnet containing hole, a fifth magnet capable of interacting with the fifth coil is arranged in the fifth magnet containing hole, and a sixth magnet capable of interacting with the sixth coil is arranged in the sixth magnet containing hole.
The second bearing seat is approximately rectangular in top view, and the third coil, the fourth coil, the fifth coil and the sixth coil are respectively positioned outside four corners of the second bearing seat.
The second bearing seat is approximately rectangular in top view, and the third coil, the fourth coil, the fifth coil and the sixth coil are respectively positioned on the outer sides of four sides of the second bearing seat.
Wherein, the first bearing seat and/or the second bearing seat are/is also provided with a displacement sensor.
The first bearing seat is connected with the second bearing seat through an integral elastic sheet, the elastic sheet comprises a first elastic section and a second elastic section, the first elastic section is connected with the first bearing seat and the second bearing seat, the second elastic section is connected with the second bearing seat and the fixed part, and the first elastic section is connected with the second elastic section through an elastic inflection point arranged on the second bearing seat.
The first bearing seat is connected with the second bearing seat through a first elastic sheet, and the second bearing seat is connected with the fixing part through a second elastic sheet.
The second bearing seat is provided with a magnetic shielding sheet between the magnet at the inner side and the coil at the outer side.
The camera module further comprises a third bearing seat arranged below the second bearing seat and elastically connected with the fixing part, and a third driving element is arranged between the third bearing seat and the second bearing seat and is suitable for driving the third bearing seat to move along the direction perpendicular to the optical axis.
The third driving element comprises four coils arranged on the third bearing seat and four magnets arranged on the second bearing seat.
The fixing part comprises a base, a motor shell and a frame positioned on the inner side of the motor shell, and the second driving element is arranged between the second bearing seat and the frame.
The fixing part comprises a base and a motor shell, and the second driving element is arranged between the second bearing seat and the motor shell.
Wherein the first drive element and/or the second drive element is a piezoelectric drive element.
Wherein the first drive element and/or the second drive element is an SMA drive element.
According to another aspect of the present application, there is also provided a method of correcting an optical axis tilt for a camera module, the camera module including: the lens assembly is provided with an optical axis; the lens assembly is arranged on the first bearing seat; the second bearing seat is elastically connected with the first bearing seat; the fixing component is positioned at the outer side of the second bearing seat, and the second bearing seat is elastically connected with the fixing component; the first driving element is arranged between the first bearing seat and the second bearing seat and is suitable for driving the first bearing seat to move along the optical axis direction relative to the second bearing seat; the second driving element is arranged between the second bearing seat and the fixed part and is suitable for driving the second bearing seat to rotate around a radial shaft relative to the fixed part, wherein the second bearing seat is provided with a reference surface perpendicular to the optical axis, and the radial shaft is a virtual axis on the reference surface;
the method of correcting the optical axis tilt includes: 1) After the camera module is assembled, measuring the inclination angle of the optical axis of the camera module; 2) A control module for calculating a current value required to be input to the second driving element for correcting the inclination angle of the optical axis and writing the current value or a parameter representing the current value into the second driving element; and
3) When shooting is carried out by the camera module, the second driving element outputs initial driving current according to the written current value or the parameter representing the current value, the optical axis posture at the moment is taken as a reference posture, and subsequent shooting is carried out by the reference posture.
Wherein the subsequent photographing includes focusing or/and an anti-shake operation.
Wherein, the step 1) further comprises: setting a target plate, wherein the target plate is provided with a plurality of marks positioned in a target view field; measuring the axial position of an imaging point corresponding to the resolution force peak value of each mark; then obtaining an image plane inclination angle according to the measured axial position of the imaging point of each mark, and further obtaining an inclination angle of the optical axis of the camera module; the step 2) further comprises the following steps: and burning the current value or the parameter representing the current value into a register of the second driving element.
Wherein the step 2) comprises the following substeps: 21 Calculating the current to be compensated according to the difference of the motor code values of the imaging points corresponding to the marks; 22 Write a compensation current to a register of the second drive element; and 23) sensing the actual movement of the lens assembly under the action of the compensation current by using a displacement sensor, calculating the inclination angle of the central axis of the lens assembly relative to a preset ideal optical axis, and finishing the step 2) when the inclination angle between the central axis of the lens assembly and the preset ideal optical axis is within a preset threshold value; otherwise, returning to the step 1) to recalculate the inclination angle of the optical axis.
Wherein the step 2) further comprises: 24 Write the compensation current to correct the inclination angle of the optical axis, focus again, and burn the clearest position.
Wherein the step 1) comprises: and moving the camera module in the axial direction, sensing the movement of four magnets positioned on the diagonal line of the second bearing seat by using a Hall element, and then calculating the included angle between the diagonal line of the second bearing seat and the horizontal plane.
Wherein the step 2) comprises: 21 According to the included angle between the diagonal line of the second bearing seat corresponding to the single code value of the driving motor and the horizontal plane, calculating the inclination angle of the second bearing seat relative to the horizontal plane to obtain an inclination angle-code curve; the inclination angle-code curve is processed in a segmented mode, a code value interval corresponding to each section of curve is recorded, and the compensation current for compensating the inclination angle in the code value interval is calculated; 22 Then writing the compensation current and the corresponding code value interval into a register of the second drive element; and 23) sensing the actual movement of the lens assembly under the action of the compensation current by using a displacement sensor, calculating the inclination angle of the central axis of the lens assembly relative to a preset ideal optical axis, and finishing the step 2) when the inclination angle between the central axis of the lens assembly and the preset ideal optical axis is within a preset threshold value; otherwise, returning to the step 1) to recalculate the inclination angle of the optical axis.
Wherein the step 2) further comprises: 24 After writing the compensation current, focusing again and burning the clearest position; the step 3) further comprises the following steps: when the camera module is used for shooting, acquiring a current actual code value, and searching a corresponding written current value or a parameter representing the current value according to a section of an inclination angle-code curve where the current actual code value is located; and the second driving element outputs an initial driving current according to the search result, takes the optical axis posture at the moment as a reference posture, and performs subsequent shooting according to the reference posture.
According to another aspect of the present application, there is also provided a method for correcting an optical axis tilt based on the aforementioned camera module, including the following steps: 1) After the camera module is assembled, measuring the inclination angle of the optical axis of the camera module; 2) A control module for calculating a current value to be input to the second drive element for correcting the inclination angle of the optical axis and writing the current value or a parameter representing the current value into the second drive element; and 3) when the camera module is used for shooting, the second driving element outputs an initial driving current according to the written current value or the parameter representing the current value, the optical axis posture at the moment is taken as a reference posture, and the subsequent shooting is carried out according to the reference posture.
Compared with the prior art, the application has at least one of the following technical effects:
1. in some embodiments of the application, the module of making a video recording has the function of focusing, anti-shake and correction optical axis simultaneously to the bearing seat that the coil place that will be used for correcting the optical axis slope is located separates with the bearing seat that the coil place that is used for focusing, can avoid the crosstalk phenomenon effectively, avoids the camera lens to receive the drive power of two directions promptly, leads to the phenomenon that the drive power of two directions hinders each other.
2. In some embodiments of the present application, by providing driving elements for performing different adjusting functions at corresponding positions of the two bearing seats and the fixing component, accurate control of focusing and correcting the optical axis can be achieved.
3. In some embodiments of the application, two bear between the seat and bear between seat and the fixed part elastic connection, can realize two simply effectively and bear between the seat and bear the relative motion between seat and the fixed part.
4. In some embodiments of the present application, by providing a precise process flow and method for correcting an optical axis tilt, a precise correction of the optical axis tilt can be achieved.
5. In some embodiments of the present application, the bearing seat corresponding to the focusing function is separated from the bearing seat corresponding to the optical axis correction, and the optical axis inclination is detected and the corresponding motor code value capable of correcting the optical axis inclination is burned in the factory stage of the module, so that the module can move the lens along the optical axis on the premise of ensuring the optical axis collimation in the use stage (i.e., in the shooting state), thereby completing the focusing operation more accurately.
6. In some embodiments of the present application, the bearing seat corresponding to the focusing function is separated from the bearing seat corresponding to the optical axis correction, and the optical axis inclination is detected and the corresponding motor code value capable of correcting the optical axis inclination is burned in the factory-leaving stage of the module, so that the module can move the lens on the premise of ensuring the optical axis collimation in the use stage (i.e., in the shooting state), and the anti-shake operation can be completed more accurately.
7. In some embodiments of the present application, the driving elements for adjusting the tilt angle of the optical axis are disposed in the four corner regions of the bearing seat, and the driving elements for driving the lens to realize the focusing function are disposed in the two side regions of the bearing seat, so that the driving elements are staggered with respect to each other, thereby effectively reducing the radial space occupied by the motor. Radial here refers to a direction perpendicular to the optical axis.
8. In some embodiments of the application, the optical axis inclination can be detected through the factory stage of the module, and the corresponding motor code value is burnt to correct the optical axis inclination generated by the assembly tolerance of the lens, the motor and the photosensitive assembly, and when the module has a large-area photosensitive chip, the advantage is more remarkable.
Drawings
Fig. 1 is a perspective exploded view illustrating main components of a camera module according to an embodiment of the present application;
fig. 2 is a schematic perspective exploded view illustrating a main component of the camera module according to an embodiment of the present application after a motor housing is removed;
fig. 3 is a perspective exploded view of the main components of the camera module according to another embodiment of the present application, with the motor housing removed;
FIG. 4 is a schematic perspective view illustrating an assembly relationship of components in the camera module according to an embodiment of the present application;
fig. 5 is a schematic internal perspective view illustrating an assembly relationship of components in a camera module according to another embodiment of the present application;
fig. 6 is a partial schematic view of a second carrier of the camera module according to an embodiment of the disclosure;
fig. 7 is an exploded perspective view of a camera module with a third carrying seat added in an embodiment of the present application.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, expressions such as first, second, etc. are used only for distinguishing one feature from another feature, and do not indicate any limitation on the features. Thus, a first body discussed below may also be referred to as a second body without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of an object have been slightly exaggerated for convenience of explanation. The figures are purely diagrammatic and not drawn to scale.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "has," "including," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, the use of "may" mean "one or more embodiments of the application" when describing embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
As used herein, the terms "substantially," "about," and the like are used as words of table approximation, not as words of table degree, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
Fig. 1 shows a schematic structural diagram of a camera module according to an embodiment of the present application. Referring to fig. 1, the camera module includes a lens assembly 1 and a motor assembly 2, which includes a first carrying seat 21 for carrying the lens module, a second carrying seat 22 located at a radial outer side of the first carrying seat, a driving part, and a fixing part 23. The first carrying seat 21 and the second carrying seat 22 are centered on the optical axis of the lens assembly 1, the second carrying seat 22 is elastically connected to the first carrying seat 21, and the second carrying seat 22 is elastically connected to the fixing member 23. The optical axis is defined as a virtual axis passing through the center of the lens assembly. According to one embodiment of the present application, as shown in fig. 1 to 4, the fixing part 23 includes a motor housing 24, a frame 25, and a base. The bearing seat is a hollow structure, a thread structure matched with each other can be arranged between the first bearing seat 21 and the lens component 1, and the bearing seat and the outer frame and the base of the fixing part are both separated by a certain distance, namely the bearing seat does not directly contact the fixing part.
According to an embodiment of the present application, as shown in fig. 2, a first coil receiving hole and a second coil receiving hole are provided at an outer side of the first carrier seat 21. The first coil receiving hole and the second coil receiving hole are respectively located at two opposite sides of the first bearing seat 21. The first coil 211 is disposed in the first coil-accommodating hole, the second coil 212 is disposed in the second coil-accommodating hole, and the first coil 211 and the second coil 212 are symmetrical about the optical axis. Accordingly, as shown in fig. 2 and 3, a first magnet accommodating hole is provided at a position corresponding to the first coil 211 inside the second bearing seat 22, a second magnet accommodating hole is provided at a position corresponding to the second coil 212 inside the second bearing seat 22, a first magnet 221 is provided in the first magnet accommodating hole, and a second magnet 222 is provided in the second magnet accommodating hole. When the first coil is electrified with current, the first coil generates a magnetic field, the first magnet is positioned in the magnetic field generated by the first coil, and Lorentz force which is mutually repulsive or attractive is generated between the first coil and the first magnet; when the second coil is electrified, the second coil generates a magnetic field, the second magnet is positioned in the magnetic field generated by the second coil, lorentz force which is mutually repulsive or attractive is generated between the second coil and the second magnet, the first magnet and the second magnet are fixed, the Lorentz force drives the first coil and the second coil to move up and down along the optical axis, and through the interaction among the first coil, the second coil, the first magnet and the second magnet, the first bearing seat can be driven to move up and down along the optical axis, so that the lens assembly is driven to move up and down along the optical axis, and focusing is realized. According to an alternative embodiment of the application, more than two, for example four, coils may be provided on the outside of the first carrier 21 and correspondingly the same number of magnets may be provided on the inside of the second carrier. It is preferable to adopt a scheme in which two coils symmetrically distributed about the optical axis are disposed outside the first carrier base 21, which is advantageous to reduce the weight and volume of the camera module.
According to an embodiment of the present application, as shown in fig. 2 and 3, the third, fourth, fifth and sixth coil-receiving holes are provided at the outer side of the second carrier seat 22. A third coil 223 is disposed in the third coil-receiving hole, a fourth coil 224 is disposed in the fourth coil-receiving hole, a fifth coil 225 is disposed in the fifth coil-receiving hole, and a sixth coil 226 is disposed in the sixth coil-receiving hole. As shown in fig. 2 and 3, the third coil 223 and the fifth coil 225 are symmetrical with respect to the optical axis, and the fourth coil 224 and the sixth coil 226 are symmetrical with respect to the optical axis. Accordingly, a third magnet accommodating hole is provided at a position corresponding to the third coil 223, a fourth magnet accommodating hole is provided at a position corresponding to the fourth coil 224, a fifth magnet accommodating hole is provided at a position corresponding to the fifth coil 225, and a sixth magnet accommodating hole is provided at a position corresponding to the sixth coil 226 inside the fixing member 23 (the frame 24 or the motor case 25). A third magnet 231 is arranged in the third magnet containing hole, a fourth magnet 232 is arranged in the fourth magnet containing hole, a fifth magnet 233 is arranged in the fifth magnet containing hole, and a sixth magnet 234 is arranged in the sixth magnet containing hole. Through electrifying two coils (third coil and fifth coil or fourth coil and sixth coil) symmetrical about the optical axis, can make two coils that are electrified interact with its corresponding magnetite to drive the second and bear the seat and rotate around the axis perpendicular with the optical axis together with first bearing seat and lens subassembly, can adjust the slope of lens optical axis, calibration optical center.
According to an embodiment of the present application, as shown in fig. 2, the second carrier 22 is substantially rectangular in a top view (preferably, the second carrier 22 may be substantially square in a top view), and the third coil 223, the fourth coil 224, the fifth coil 225 and the sixth coil 226 are respectively disposed outside four side corners of the second carrier 22. Accordingly, the frame 24 is substantially rectangular in plan view (preferably, the frame 24 may be substantially square in plan view), and the third magnets 231, the fourth magnets 232, the fifth magnets 233, and the sixth magnets 234 are provided inside the four corners of the frame 24, respectively. When current is supplied to the third coil 223, the third coil 223 generates a magnetic field, the third magnet 231 is positioned in the magnetic field generated by the third coil 223, and Lorentz force which is mutually repulsive or attractive is generated between the third coil 223 and the third magnet 231; when the current is applied to the fifth coil 225, the fifth coil 225 generates a magnetic field, the fifth magnet 233 is located in the magnetic field generated by the fifth coil 225, and the fifth coil 225 and the fifth magnet 233 generate a lorentz force that repels or attracts each other, so that the third coil 223 and the fifth coil 225 drive the second carrier 22 to rotate upward or downward around the axis a (the line connecting the fourth coil 224 and the sixth coil 226) together with the first carrier 21 and the lens assembly 1. Similarly, when the current is applied to the fourth coil 224, the fourth coil 224 generates a magnetic field, the fourth magnet 232 is located in the magnetic field generated by the fourth coil 224, and the fourth coil 224 and the fourth magnet 232 generate a lorentz force that repels or attracts each other; when current is applied to the sixth coil 226, the sixth coil 226 generates a magnetic field, the sixth magnet 234 is located in the magnetic field generated by the sixth coil 226, and a lorentz force repelling or attracting each other is generated between the sixth coil 226 and the sixth magnet 234, so that the fourth coil 224 and the sixth coil 226 drive the second carrier 22 together with the first carrier 21 and the lens assembly 1 to move upward or downward around the b-axis (the line connecting the third coil 223 and the fifth coil 225). By this operation, the inclination of the optical axis of the lens can be adjusted to calibrate the optical center. In this embodiment, the plane on which the a-axis and the b-axis are located may be referred to as a reference plane, and the reference plane is substantially perpendicular to the optical axis of the lens assembly. The four coils are respectively arranged at the outer sides of the four side corners of the second bearing seat and correspondingly four magnets are arranged at the inner sides of the four side corners of the frame, so that the size of the motor can be reduced, and the size of the camera module is correspondingly reduced.
According to another embodiment of the present application, as shown in fig. 3, the second carrier 22 is substantially rectangular in a top view (preferably, the second carrier 22 may be substantially square in a top view), and the third coil 223, the fourth coil 224, the fifth coil 225 and the sixth coil 226 are respectively disposed outside four sides of the second carrier 22. Accordingly, the frame 24 is substantially rectangular in plan view (preferably, the frame 24 may be substantially square in plan view), and the third magnet 231, the fourth magnet 232, the fifth magnet 233, and the sixth magnet 234 are provided inside the four sides of the frame 24, respectively. Similar to the previous embodiment, when the current is applied to the coils to generate a magnetic field, the corresponding magnets are located in the magnetic field, and the magnets and the magnetic field generate interaction, so that the driving coil moves up and down to drive the second carrying seat 22, together with the first carrying seat 21 and the lens assembly 1, to move up or down around the c-axis (the connection line between the third coil 223 and the fifth coil 225) or the d-axis (the connection line between the fourth coil 224 and the sixth coil 226), which can also achieve the purpose of adjusting the tilt of the optical axis of the lens and calibrating the optical center. In this embodiment, the plane on which the c-axis and the d-axis are located may be referred to as a reference plane, and the reference plane is substantially perpendicular to the optical axis of the lens assembly.
In order to adjust the tilt of the optical axis of the lens more precisely, more than four coils, for example, six or eight coils, symmetrical with respect to the optical axis may be provided outside the second carrier, and accordingly the same number of magnets may be provided inside the fixing member, thereby calibrating the optical center more precisely.
According to one embodiment of the invention, as shown in FIG. 5, the frame for mounting the magnets can be omitted, and the third magnets 231, the fourth magnets 232, the fifth magnets 233 and the sixth magnets 234 can be directly arranged at the inner side of the motor shell, thereby reducing the size of the motor and being beneficial to the miniaturization of the module.
According to an embodiment of the present application, as shown in fig. 2 and 3, the first bearing seat 21 and the second bearing seat 22 and the fixing component 23 are connected by an integral spring 26, the spring 26 includes a first elastic segment 261 connecting the first bearing seat 21 and the second bearing seat 22 and a second elastic segment 262 connecting the second bearing seat 22 and the fixing component 23, and the first elastic segment 261 and the second elastic segment 262 are engaged by an elastic inflection point disposed on the second bearing seat 22. By this arrangement, a relative movement between the first bearing seat 21 and the second bearing seat 22 can be achieved, and a relative movement between the first bearing seat 21 together with the second bearing seat 22 and the fixing part 23 (the frame 24 or the motor housing 25) can be achieved. The whole elastic sheet is arranged, so that the assembly process flow can be simplified, and the size of the motor can be reduced.
According to another embodiment of the present application, two independent spring pieces are provided, the first carrying seat 21 and the second carrying seat 22 are elastically connected through the first spring piece, and the second carrying seat 22 and the fixing component 23 are elastically connected through the second spring piece.
The first carrier 21 may also be provided with a displacement sensor, for example a hall sensor. According to one embodiment of the present application, the hall sensor is disposed outside the first bearing seat 21. Preferably, the hall sensor is arranged on one side edge which is not provided with the coil containing hole, the hall sensor containing hole is arranged on the side edge, the hall sensor is arranged in the hall sensor containing hole, namely, four side edges outside the first bearing seat are provided with the containing holes on three side edges, two containing holes for placing the AF coil are arranged in opposite sides, and one of the other two side edges is provided with the containing hole for placing the hall sensor. Set up a hall sensor in hall sensor holding hole, bear one side that seat 22 corresponds with hall sensor holding hole at the second and set up a hall magnetite, through the cooperation of magnetite and sensor, hall sensor can sense the first position of bearing the actual removal of seat 21, with the first deviation of the position that bears the seat removal of predetermineeing, and feed back. By providing the hall sensor, the movement of the lens assembly can be driven more accurately.
The second carrier 22 may be provided with a displacement sensor, for example a hall sensor. The hall sensors can be arranged inside the coil outside the second carrier, at least two hall sensors being arranged on two adjacent coils, for example in the third coil and in the fourth coil. Use and bear a side corner at the second and set up the coil as the example, set up two hall sensor in adjacent third coil and fourth coil, hall sensor can with third coil and the public two magnetite of fourth coil, third magnetite and fourth magnetite promptly, can sense from this the second bear the seat around a axle or b axle when rotating relative motion and feedback between coil and the magnetite. Without additionally adding a Hall magnet, the position to which the second bearing seat actually moves is sensed and fed back. Similarly, for the embodiment in which the coil is provided in the side edge of the second carrier, two hall sensors may be provided inside two adjacent coils, for example, in the third coil and the fourth coil, and the hall sensors may share two magnets, i.e., the third magnet and the fourth magnet, with the third coil and the fourth coil, thereby sensing and feeding back the relative movement between the coil and the magnet when the second carrier rotates about the c-axis or the d-axis. Without additionally adding a Hall magnet, the position to which the second bearing seat actually moves is sensed and fed back.
According to one embodiment of the present application, the second carrier 22 has a magnetic shield sheet disposed between the magnet inside and the coil outside. Because the coil is arranged at the inner side of the second bearing seat, the magnet is arranged at the outer side, the inner coil is electrified to generate a magnetic field, the outer magnet is positioned in the magnetic field generated by the inner coil, the magnetic field enables the outer magnet to generate Lorentz force, namely the magnetic field generated by the inner coil interferes with the outer magnet, in order to avoid the mutual interference of the magnets of the inner coil and the outer coil of the bearing seat, a magnetism isolating sheet is arranged at the joint of the outer magnet of the second bearing seat and the bearing seat, and the magnetic field generated by the inner coil cannot interfere with the outer magnet, as shown in figure 6.
Because the coil that the drive lens subassembly moved up and down along the optical axis direction sets up in first bearing the seat, and the coil that the drive lens subassembly rotated around a, b (or c, d) axle sets up in the second bears the seat, and first bearing the seat and the second bears the seat to separate and set up, and the magnetic field that the coil that is located first bearing the seat produced separates each other with the magnetic field that the coil that is located the second bearing the seat produced, mutual noninterference between the magnetic field can avoid the crosstalk problem that the magnetic field produced. Meanwhile, in the prior art, the coil for driving the lens assembly to move up and down and the coil for driving the lens assembly to rotate around the axis a and the axis b (or the axis c and the axis d) are arranged on the same bearing seat, when the coil is electrified to drive the lens assembly, the up-and-down force and the force rotating around the axis are difficult to avoid crosstalk, in the application, the first bearing seat coil drives the lens to move up and down, the second bearing seat drives the lens assembly to rotate around the axis, the up-and-down force and the force rotating around the axis are separated along with the separation arrangement of the first bearing seat and the second bearing seat, and the crosstalk problem caused by the force generated in the driving process is avoided.
According to one embodiment of the present application, an optical anti-shake function is added on the basis of the optical axis correction and focusing. Specifically, two coils may be added to the second bearing seat 22, and four coils, namely, the fifth coil, the sixth coil, the seventh coil and the eighth coil, are disposed on four sides of the lower side of the second bearing seat. Correspondingly, four magnets are correspondingly arranged on the motor substrate, namely a seventh magnet, an eighth magnet, a ninth magnet and a tenth magnet, wherein the seventh magnet is arranged corresponding to the seventh coil, the eighth magnet is arranged corresponding to the eighth coil, the ninth magnet is arranged corresponding to the fifth coil, the tenth magnet is arranged corresponding to the sixth coil, the four coils and the magnets are overlapped when overlooking along the optical axis direction, at the moment, when the fifth coil is electrified to generate a magnetic field, the ninth magnet is positioned in the magnetic field generated by the fifth coil and is subjected to Lorentz force, and the fifth coil and the ninth magnet are mutually attracted or repelled, so that the fifth coil drives the second bearing seat to move along a plane vertical to the optical axis. Similarly, the sixth, seventh, and eighth coils may also drive the second carrier to move along a plane perpendicular to the optical axis (wherein, when the third, fourth, fifth, and sixth coils of the second carrier are disposed on four sides of the second carrier to correct the tilt of the c-axis or d-axis, the four coils of the second carrier may be matched with the four magnets of the motor housing or the frame to drive the second carrier to rotate along the c-axis or d-axis, or matched with the four magnets on the motor substrate to drive the second carrier to move along the direction perpendicular to the optical axis, that is, the tilted coils and the OIS anti-shake coils may be shared). An axis perpendicular to a plane formed by the four magnets for tilt correction and an axis perpendicular to a plane formed by the four magnets for OIS shake prevention are not parallel.
Preferably, a hall sensor can be further arranged, the hall sensor is arranged on the lower side of the second bearing seat, the hall sensor is arranged in a coil on the lower side of the second bearing seat, at least two hall sensors are arranged on two adjacent coils, the hall sensor and the coil for OIS anti-shake share one group of magnets, and the position to which the second bearing seat actually moves is sensed and fed back.
Fig. 7 is a schematic exploded perspective view of a camera module according to a modified embodiment of the present application. Referring to fig. 7, according to an embodiment of the present application, a third bearing seat 27 is disposed below the second bearing seat, the third bearing seat 27 is fixed by a lower elastic sheet (not shown in fig. 7), opposite side magnets are disposed on the first bearing seat 21 for focusing, four corner magnets are disposed on the second bearing seat 22 for correcting the tilt of the optical axis, at this time, four coils are disposed on four sides of the third bearing seat 27, and correspondingly, four magnets are disposed on the second bearing seat (when the third, fourth, fifth, and sixth coils of the second bearing seat are disposed on four sides of the second bearing seat, and when the tilt of the c and d axes is corrected, the four coils of the second bearing seat can be used to drive the second bearing seat to move along the optical axis direction, and can also drive the second bearing seat to move along the vertical optical axis direction, that is, the coils for adjusting the tilt and the coils for OIS anti-shake coils can be used together). Or, the third bearing seat is provided with an integral flat coil 28 as an OIS coil, and through the interaction between the magnet of the second bearing seat and the flat coil 28 of the third bearing seat, the coil drives the third bearing seat 27 to move along a plane perpendicular to the optical axis, and the lens module moves along a plane perpendicular to the optical axis, so that the anti-shake effect is achieved.
According to an alternative embodiment of the present application, two piezoelectric sensors (in this embodiment, the piezoelectric sensors may be regarded as piezoelectric driving elements) are symmetrically disposed on the first bearing seat, optionally, the two piezoelectric sensors are disposed at opposite corners of the first bearing seat, the piezoelectric sensors are disposed outside the first bearing seat, when an alternating voltage is applied to the piezoelectric sensors, the piezoelectric sensors generate an alternating expansion phenomenon, so that the piezoelectric sensors obtain a driving force to drive the first bearing seat to move up or down along the optical axis, and the lens assembly moves up or down under the action of the piezoelectric sensors, thereby achieving a focusing effect. Furthermore, a second bearing seat is arranged, the first bearing seat and the second bearing seat take the optical axis as the center, the first bearing seat and the second bearing seat are arranged in an inner-outer overlapping mode, the first bearing seat is located inside the second bearing seat, and the first bearing seat and the second bearing seat can be connected through elastic pieces. The four piezoelectric sensors are symmetrically arranged on the second bearing seat, optionally, the four piezoelectric sensors are arranged at four corners of the second bearing seat, the piezoelectric sensors are fixed at the outer side of the second bearing seat, when the piezoelectric sensors input current, an external alternating voltage is applied to the piezoelectric sensors under a driving source, and an alternating expansion phenomenon is generated, so that the piezoelectric sensors can obtain driving power, and then the first bearing seat is driven by friction force to move upwards or downwards, so that the first bearing seat rotates around a shaft a and a shaft b (connecting lines of the two diagonal piezoelectric sensors are respectively an a shaft and a b shaft).
In another embodiment, the four piezoelectric sensors may also be disposed at the centers of the four sides of the second bearing seat, and at this time, the piezoelectric sensors on the two opposite sides alternately extend and contract under the action of the ac voltage to drive the two opposite sides of the second bearing seat to move upward or downward, so that the second bearing seat rotates around the c axis and the d axis (the connection lines of the piezoelectric sensors on the two opposite sides are the c axis and the d axis, respectively). The second bearing seat is rotated around the shaft through the piezoelectric sensor, so that the lens assembly can also rotate around a shaft a and a shaft b (or a shaft c and a shaft d) for correcting the inclination of the optical axis of the lens.
According to another alternative embodiment of the present application, two SMA (shape memory alloy) wires are disposed on the first bearing seat, optionally, two SMA wires are disposed at opposite corners of the second bearing seat, the top end of the SMA wire is fixed to the upper spring plate, and the tail end of the SMA wire is fixed to the first bearing seat. Similarly, the two SMA wires may be disposed at the center of the opposite sides of the first bearing seat, the top end of the SMA wire is fixed to the upper spring plate, and the tail end of the SMA wire is fixed to the first bearing seat, so as to drive the first bearing seat to move upward or downward along the optical axis, and the lens assembly moves upward or downward under the action of the SMA wires, thereby achieving the focusing effect. Furthermore, a second bearing seat is arranged, the first bearing seat and the second bearing seat are arranged in an inner-outer overlapping mode by taking the optical axis as the center, the first bearing seat is located inside the second bearing seat, and the first bearing seat and the second bearing seat are connected through elastic pieces. And when the SMA wires are electrified, the SMA wires deform and are elongated or contracted, the two diagonal SMA wires are elongated or contracted under the action of the current, and the two diagonal SMA wires of the second bearing seat are driven to move upwards or downwards so that the second bearing seat rotates around the axes a and b (the connecting lines of the two diagonal SMA wires are respectively an axis a and an axis b).
In another embodiment, the four SMA wires may also be disposed at the centers of the four sides of the second bearing seat, and at this time, the SMA wires at two opposite sides are elongated or contracted under the action of the current to drive the two opposite sides of the second bearing seat to move up or down, so that the second bearing seat rotates around the c axis and the d axis (the connection line of the SMA wires at two opposite sides is the c axis and the d axis, respectively). The second bearing seat is rotated around the shaft through the SMA wire, so that the lens assembly can also rotate around a shaft a and a shaft b (or a shaft c and a shaft d) for correcting the inclination of the optical axis of the lens.
Furthermore, a third bearing seat can be arranged, the third bearing seat, the first bearing seat and the second bearing seat use the optical axis as the center, the inner part and the outer part are overlapped, the third bearing seat is arranged at the outer side of the second bearing seat, the first bearing seat, the second bearing seat and the third bearing seat are connected through elastic pieces, four SMA wires are arranged on the third bearing seat and are respectively positioned at the central positions of four side walls, when the SMA wires are connected with current, the SMA wires deform and stretch or contract, the third bearing seat is driven to move along the direction of the vertical optical axis, the lens assembly is driven to move along the direction of the vertical optical axis, and the anti-shake effect is achieved.
Similarly, the four SMA wires may also be disposed at four corners of the third bearing seat to drive the lens assembly to move along the direction perpendicular to the optical axis, so as to achieve the anti-shake effect.
Wherein, the first bearing seat and the second bearing seat can be interchanged in position.
Further, the present application also proposes an embodiment of a method for correcting an optical axis tilt (i.e. a process flow for correcting an optical axis), which includes the following steps S1 to S7.
And S1, aligning the camera module to a standard plate. The target plate has four marks in the 0.8 field of view, which are located at the four corners of the target plate respectively. Wherein the 0.8 field of view is the target field of view for evaluating the imaging quality of the module, and in other embodiments, the target field of view may be replaced by a field of view other than 0.8.
Step S2, focusing: and acquiring a defocusing curve, and searching an image surface center code value corresponding to the resolution force peak value of the four corner identifier of the 0.8 view field.
Specifically, in one embodiment, the position of the target is fixed, the motor drives the lens to move along the optical axis, and the position corresponding to the peak of the resolution force is found within the moving stroke range, and the position can be represented by the code value of the motor. The markers at the four corners of the target, all of which are located on the target field of view (e.g., 0.8 field of view), may be selected as representative targets. Each identifier can find a corresponding resolution peak value and a code value corresponding to the resolution peak value. The four identities correspond to four code values. Each code value represents the offset distance that a motor moves along the optical axis (or z-axis). Due to factors such as manufacturing and assembly tolerance, the four code values corresponding to the four corner markers are often inconsistent (the four code values respectively correspond to the axial positions of the four clear imaging points of the four corner markers, and the axial positions of the imaging points are offset of the imaging points in the z-axis direction), that is, the image plane is not completely horizontal but inclined. In this embodiment, the corresponding image plane is fitted according to the four code values, and then the code value of the center point position of the image plane is taken as the center code value corresponding to the resolution peak value. On the other hand, the inclination angle of the image plane can be obtained according to the fitted image plane. And obtaining the inclination angle of the optical axis of the camera module according to the inclination angle of the image plane.
In another embodiment, when the defocus curve is obtained, the reticle may be moved along the optical axis (or z axis), so as to find the resolution peak values and the corresponding axial positions of the image points (i.e., the offset in the z axis direction) corresponding to a plurality of representative target objects in the target field of view, and further obtain the image plane center code values and the image plane tilt angles corresponding to the resolution peak values. And obtaining the inclination angle of the optical axis of the camera module according to the inclination angle of the image plane.
Step S3, calculating current: and calculating the current to be compensated for correcting the inclination angle of the optical axis according to the code value difference (the compensation direction is represented by the positive and negative of the compensated code value). The code (mean of transverse and longitudinal) of a set of diagonal coils is used to calculate the a-axis current; code (horizontal and longitudinal mean value) of another group of diagonal coils is used for calculating b-axis current, if the code difference value is positive, the value is corrected; otherwise, the negative value is complemented.
In this step, the compensation calculation formula is as follows: tilt = arcsin (D × B/C);
wherein, B is the slope of the characteristic curve of the closed-loop motor, namely the slope of the code value of the stroke and the center of the motor during focusing, and the unit is mum/code; c is the length of the diagonal line of the imaging area of the chip and the unit of micrometer; d is a code value of the image surface central point position as a central code value corresponding to the resolution force peak value, and the unit is code;
further, converting the tilt value into a compensation value, wherein the compensation value is a current value needing compensation;
compensation value = tilt 1/sensitivity/Imax
Wherein Imax is the maximum value of the motor current and has unit mA; the sensitivity is the sensitivity of the motor in the a and b axes. Sensitivity is the slope of the open loop current and motor travel in minutes/mA.
Step S4, writing compensation current: an operation is input to the register to provide an adjustment current to correct the tilt. The step can comprise the following substeps:
1. closing the hall element (i.e., clearing); 2. selecting an open-loop mode, and turning on a Hall element; 3. writing the current value needing to be compensated for the X axis; 4. writing the Y-axis requires a compensated current value.
The specific operation of inputting to the register includes:
1. clearing: 0x48, F015,2. Wherein 0x48 is I 2 C address, F015 is a register address, and 2 represents closing the closeloop, i.e., closing the hall element, which is used as the position sensor in the present embodiment.
2. Selecting an open-loop mode, turning on a Hall element: 0x48, F010,3. Wherein 0x48 is I 2 The address C, F010, is the register address, and 3 represents opening openloop, that is, selecting open loop mode, and opening the hall element.
3. Write X-axis current: 0x48, F0, x (I) 2 C address, register address, write control x-axis current).
4. Write Y-axis Current: 0x48,140,y (I) 2 C address, register address, write control y-axis current).
And after the step S4 is finished, actually completing the burning of the optical axis correction information. In subsequent shooting, the motor can be driven by the burnt optical axis correction information, and then the initial posture of the lens is set, so that the inclination of the optical axis is corrected.
Step S5, feedback of the Hall sensor: the Hall sensor senses the position to which the motor actually moves, the position is compared with a preset optical axis, the difference value is within the range of 5', and the next step is executed; if the difference is greater than 5', the feedback is made to the previous step (i.e. step S2) for re-correction.
And S6, the control module instructs the motor controller to control the motor so as to correct the inclination of the optical axis.
Step S7, AF focusing is performed again: focusing and burning the clearest position.
Further, when the camera module is used for shooting, the second driving element of the motor can drive the motor according to the optical axis correction information burnt in the step S4, and then the initial posture of the lens is set, so that the inclination of the optical axis is corrected. In the present embodiment, the optical axis correction information is a code value of the motor, which represents the initial driving current of the second driving element. After the motor outputs the initial driving current, the optical axis posture of the lens is corrected, the optical axis posture at this time is taken as a reference posture, and the subsequent shooting is performed in the reference posture. It should be noted that the burned optical axis correction information is not limited to the code value of the motor in the present application, for example, in other embodiments of the present application, the burned optical axis correction information may be a current value or other parameters representing the current value.
Further, the present application also proposes another embodiment of the method for correcting an optical axis tilt, comprising the steps of:
step S10, aligning the camera module to a standard plate; the target may have four markers located at 0.8 fields of view, each at a corner of the target. Wherein the 0.8 view field is the target view field for evaluating the module imaging quality, and in other embodiments, the target view field may be replaced by another view field other than 0.8.
In step S20, the hall element is used to sense the positions of the four corner magnets (e.g., the magnets mounted at the four corners of the second carrier), and then the included angle between the diagonal line of the plane where the four corner magnets are located and the standard plane is calculated, where the standard plane may be a horizontal plane in this embodiment.
In step S30, a compensation current required for correcting the optical axis is calculated. Specifically, a tilt (in this embodiment, the tilt may be understood as an inclination angle) with respect to the standard plane is calculated from an included angle value corresponding to the single code value, and a tilt-code curve is obtained. The tilt-code curve is segmented (for example, a preset value plus an offset interval may be used for segmentation, where the preset value may be, for example, tilt =1', and the offset interval is a deviation range from the preset value), code values corresponding to both ends of each segment of the curve are recorded, and for each segment of the tilt-code curve, the tilt value and a corresponding compensation current of the segment are calculated in a manner of least square method or the like (the compensation current may be represented by, for example, a code value of a motor).
The method of calculating the current to be compensated (the compensation direction is represented by the positive and negative of the compensated code value) may include: the codes of a group of diagonal coils are used for calculating a-axis current; the code of the other group of diagonal coils is used for calculating b-axis current, and if the code difference value is positive, a value is corrected; otherwise, the negative value is complemented.
Compensation calculation formula: tilt = arcsin (D × B/C);
wherein, B is the slope of the characteristic curve of the closed-loop motor, namely the slope of the code value of the stroke and the center of the motor during focusing, and the unit is mum/code; c is the length of the diagonal line of the imaging area of the chip and the unit of micrometer; d is a code value of the image surface central point position as a central code value corresponding to the resolution force peak value, and the unit is code;
further, the tilt value is converted into a compensation value, namely a current value needing compensation;
compensation value = tilt 1/sensitivity/Imax;
wherein Imax is the maximum value of the motor current and has unit mA; the sensitivity is the sensitivity of the motor in the directions of the axes a and b. (sensitivity is the slope of the open loop current and motor travel in minutes/mA).
Step S40, writing in the compensation current. Specifically, an operation is input to the register, an adjustment current is provided, the tilt is corrected, and the steps of: 1. closing the closeloop;2. opening the openloop;3. writing the current value needing to be compensated in the X axis; 4. writing the Y-axis requires a compensated current value.
The specific operation of inputting to the register includes:
1. close closeloop:0x48, F015,2 (which respectively represent: I) 2 C address, register address, close closeloop).
2. Opening the openloop:0x48, F010,0 (which respectively represent: I) 2 C address, register address, open openloop). 3. Write X-axis current: 0x48, F0, x (I) 2 C address, register address, write control x-axis current). 4. Write Y-axis Current: 0x48,140,y (I) 2 C address, register address, write control y-axis current). In this step, for each segment (i.e. each code value interval) of the tilt-code curve, a corresponding compensation value, i.e. a current value to be compensated or a parameter representing the current value, may be written. Step S50, feedback of the Hall sensor: the Hall sensor senses the position to which the motor actually moves, the position is compared with a preset optical axis, the difference value is within the range of 5', and the next step is executed; if the difference is greater than 5', the feedback is made to step S20And (7) newly correcting.
In step S60, the control module instructs the motor controller to control the motor so as to correct the optical axis tilt.
Step S70, AF focusing is performed again: focusing and burning the clearest position.
Further, when the camera module is used for shooting, the second driving element of the motor can drive the motor according to the optical axis correction information burned in the step S40, so as to set the initial posture of the lens, and further correct the inclination of the optical axis. In the present embodiment, the optical axis correction information is a code value of the motor, which represents the initial driving current of the second driving element. After the motor outputs the initial driving current, the optical axis posture of the lens is corrected, the optical axis posture at this time is taken as a reference posture, and the subsequent shooting is performed at the reference posture. It should be noted that the burned optical axis correction information is not limited to the code value of the motor in the present application, for example, in other embodiments of the present application, the burned optical axis correction information may be a current value or other parameters representing the current value.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (21)

1. A method for correcting an optical axis tilt for a camera module, the camera module comprising:
the lens assembly is provided with an optical axis;
the lens assembly is arranged on the first bearing seat;
the second bearing seat is positioned at the outer side of the first bearing seat, and the first bearing seat is elastically connected with the second bearing seat;
the fixing component is positioned on the outer side of the second bearing seat, and the second bearing seat is elastically connected with the fixing component;
the first driving element is arranged between the first bearing seat and the second bearing seat and is suitable for driving the first bearing seat to move along the optical axis direction relative to the second bearing seat; and
the second driving element is arranged between the second bearing seat and the fixed part and is suitable for driving the second bearing seat to rotate around a radial shaft relative to the fixed part, wherein the second bearing seat is provided with a reference surface perpendicular to the optical axis, and the radial shaft is a virtual axis on the reference surface;
the method of correcting the optical axis tilt includes:
step 1) measuring the inclination angle of the optical axis of the camera module after the camera module is assembled;
step 2) calculating a current value required to be input to the second driving element for correcting the inclination angle of the optical axis and writing the current value or a parameter representing the current value into a control module of the second driving element; and
step 3) when the camera module is used for shooting, the second driving element outputs initial driving current according to the written current value or the parameter representing the current value, the current optical axis posture is used as a reference posture, and subsequent shooting is carried out according to the reference posture;
wherein the step 2) comprises the following substeps:
the step 2) comprises the following steps:
step 21) calculating the inclination angle of the second bearing seat relative to the horizontal plane according to the included angle between the diagonal line of the second bearing seat corresponding to the single code value of the driving motor and the horizontal plane to obtain an inclination angle-code curve; the inclination angle-code curve is processed in a segmented mode, a code value interval corresponding to each section of curve is recorded, and compensation current for compensating the inclination angle in the code value interval is calculated;
step 22) then writing the compensation current and the corresponding code value interval into a register of the second drive element; and
step 23) sensing the actual movement of the lens assembly under the action of the compensation current by using a displacement sensor, calculating the inclination angle of the middle axis of the lens assembly relative to a preset ideal optical axis, and finishing the step 2) when the inclination angle between the middle axis of the lens assembly and the preset ideal optical axis is within a preset threshold value; otherwise, returning to the step 1) to recalculate the inclination angle of the optical axis.
2. The method according to claim 1, wherein the first driving element comprises a coil disposed on an outer surface of the first carrier and a magnet disposed on an inner surface of the second carrier.
3. The method according to claim 1, wherein in the imaging module, the second driving element includes a coil disposed on an outer side surface of the second holder and a magnet disposed on an inner side surface of the fixing member.
4. The method according to claim 2, wherein in the camera module, a first coil receiving hole and a second coil receiving hole are provided on an outer side surface of the first holder, the first coil receiving hole and the second coil receiving hole being symmetrical with respect to the optical axis, and a first coil and a second coil are respectively provided in the first coil receiving hole and the second coil receiving hole; the medial surface that the second bore the weight of the seat set up with first magnetite holding hole that first coil holding hole corresponds and with the second magnetite holding hole that second coil holding hole corresponds, set up in the first magnetite holding hole can with first coil interact's first magnetite, set up in the second magnetite holding hole can with second coil interact's second magnetite.
5. The method of correcting an optical axis tilt according to claim 3, wherein a third coil-receiving hole, a fourth coil-receiving hole, a fifth coil-receiving hole, and a sixth coil-receiving hole are provided in an outer side surface of the second holder, the third coil-receiving hole and the fifth coil-receiving hole being symmetrical with respect to the optical axis, the fourth coil-receiving hole and the sixth coil-receiving hole being symmetrical with respect to the optical axis, and a third coil, a fourth coil, a fifth coil, and a sixth coil are provided in the third coil-receiving hole, the fourth coil-receiving hole, the fifth coil, and the sixth coil-receiving hole, respectively; the inner side surface of the fixed component is provided with a third magnet containing hole corresponding to the third coil containing hole, a fourth magnet containing hole corresponding to the fourth coil containing hole, a fifth magnet containing hole corresponding to the fifth coil containing hole and a sixth magnet containing hole corresponding to the sixth coil containing hole, a third magnet capable of interacting with the third coil is arranged in the third magnet containing hole, a fourth magnet capable of interacting with the fourth coil is arranged in the fourth magnet containing hole, a fifth magnet capable of interacting with the fifth coil is arranged in the fifth magnet containing hole, and a sixth magnet capable of interacting with the sixth coil is arranged in the sixth magnet containing hole.
6. The method according to claim 5, wherein the second holder has a substantially rectangular shape in a plan view, and the third coil, the fourth coil, the fifth coil and the sixth coil are respectively located outside four corners of the second holder.
7. The method according to claim 5, wherein the second holder has a substantially rectangular shape in a plan view, and the third coil, the fourth coil, the fifth coil and the sixth coil are respectively located outside four sides of the second holder.
8. The method for correcting the tilt of the optical axis according to claim 1, wherein the first carrying seat and/or the second carrying seat of the camera module is further provided with a displacement sensor.
9. The method according to claim 1, wherein the image capturing module is configured such that the first carrier and the second carrier and the fixing member are connected by an integral spring, the spring comprises a first elastic section connecting the first carrier and the second carrier and a second elastic section connecting the second carrier and the fixing member, and the first elastic section and the second elastic section are connected by an elastic inflection point provided on the second carrier.
10. The method according to claim 1, wherein the first carrier and the second carrier are connected by a first spring, and the second carrier is connected to the fixing member by a second spring.
11. The method according to claim 3, wherein a magnetic shield is disposed between the magnet inside the second carrier and the coil outside the second carrier in the camera module.
12. The method according to claim 3, wherein the image capturing module further comprises a third supporting base disposed below the second supporting base and elastically connected to the fixing member, and a third driving element is disposed between the third supporting base and the second supporting base and adapted to drive the third supporting base to move along a direction perpendicular to the optical axis.
13. The method according to claim 12, wherein the third driving element comprises four coils disposed on the third carrier and four magnets disposed on the second carrier.
14. The method according to claim 1, wherein the fixing member of the camera module comprises a base, a motor housing, and a frame located inside the motor housing, and the second driving element is disposed between the second carriage and the frame.
15. The method according to claim 1, wherein the fixing member of the camera module comprises a base and a motor housing, and the second driving element is disposed between the second carriage and the motor housing.
16. The method of correcting an optical axis tilt according to claim 1, wherein in the camera module, the first driving element and/or the second driving element is a piezoelectric driving element.
17. A method of correcting for optical axis tilt according to claim 1, wherein the first and/or second drive elements in the camera module are SMA drive elements.
18. The method of correcting an optical axis tilt according to claim 1, wherein the subsequent photographing includes a focusing or/and an anti-shake operation.
19. The method of correcting an optical axis tilt according to claim 1, wherein the step 1) further comprises: setting a target plate, wherein the target plate is provided with a plurality of marks positioned in a target view field; measuring the axial position of an imaging point corresponding to the resolution force peak value of each identifier; then obtaining an image plane inclination angle according to the measured axial position of the imaging point of each identifier, and further obtaining an inclination angle of the optical axis of the camera module;
the step 2) further comprises the following steps: and burning the current value or the parameter representing the current value into a register of the second driving element.
20. The method of correcting an optical axis tilt according to claim 1, wherein the step 1) includes: and moving the camera module in the axial direction, sensing the movement of the four magnets positioned on the diagonal line of the second bearing seat by using a Hall element, and then calculating the included angle between the diagonal line of the second bearing seat and the horizontal plane.
21. The method of correcting an optical axis tilt according to claim 1, wherein the step 2) further comprises:
step 24), focusing again after writing the compensation current, and burning the clearest position;
the step 3) further comprises the following steps: when the camera module is used for shooting, acquiring a current actual code value, and searching a corresponding written current value or a parameter representing the current value according to a section of an inclination angle-code curve where the current actual code value is located; and the second driving element outputs an initial driving current according to the search result, takes the optical axis posture at the moment as a reference posture, and performs subsequent shooting according to the reference posture.
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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114666484A (en) * 2022-04-19 2022-06-24 Oppo广东移动通信有限公司 Camera module and electronic device

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW555016U (en) * 2002-12-13 2003-09-21 Tekom Technologies Inc Lens structure with adjustable inclination
JP2010011042A (en) * 2008-06-26 2010-01-14 Acutelogic Corp Tilt correction method for imaging apparatus, and tilt-correcting apparatus
CN102981683A (en) * 2012-12-10 2013-03-20 广东威创视讯科技股份有限公司 Rapid correction method and optical axis correction method for optical positioning block of camera
JP2014089265A (en) * 2012-10-29 2014-05-15 Sharp Corp Method to assemble camera module and camera module
WO2016000874A1 (en) * 2014-07-01 2016-01-07 Fotonation Limited A method for calibrating an image capture device
CN106303264A (en) * 2016-11-04 2017-01-04 东莞佩斯讯光电技术有限公司 Controllable motor and the camera module of rapid focus sensor and control method is tilted based on camera lens
CN106937028A (en) * 2015-12-30 2017-07-07 南昌欧菲光电技术有限公司 Camera module assemble method and camera module
CN109116505A (en) * 2018-07-24 2019-01-01 深圳睿晟自动化技术有限公司 The optical axis bearing calibration of camera lens
CN109361877A (en) * 2018-12-25 2019-02-19 信利光电股份有限公司 More camera module group arrangements and technique
CN110753172A (en) * 2019-10-22 2020-02-04 Oppo广东移动通信有限公司 Correction method and device, electronic equipment and voice coil motor
CN110855856A (en) * 2018-08-21 2020-02-28 宁波舜宇光电信息有限公司 Assembling method of multi-group optical lens based on motor optical assembly

Family Cites Families (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI259463B (en) * 2003-10-24 2006-08-01 Lite On It Corp A tilt correction method
JP2006091263A (en) * 2004-09-22 2006-04-06 Fuji Photo Film Co Ltd Lens device, photographing device, optical device, projection device, imaging apparatus and cellular phone with camera
JP2008203719A (en) * 2007-02-22 2008-09-04 Konica Minolta Opto Inc Lens driving apparatus, imaging apparatus and mobile terminal
CN102016709B (en) * 2008-04-30 2014-04-09 日本电产三协株式会社 Optical unit with shake correcting function and photographic optical device
JP4804564B2 (en) * 2009-07-14 2011-11-02 キヤノン株式会社 Optical apparatus having shake correction device
JP5504517B2 (en) * 2009-08-17 2014-05-28 新シコー科技株式会社 Lens drive device, autofocus camera and camera phone
JP5538020B2 (en) * 2010-03-25 2014-07-02 日本電産サンキョー株式会社 Optical device for photography
WO2015156135A1 (en) * 2014-04-08 2015-10-15 オリンパス株式会社 Drive device and imaging device
CN103984199B (en) * 2014-05-30 2017-01-18 爱佩仪光电技术（深圳）有限公司 Adjustment and application method for tilting compensation control of lens of automatic focusing camera module
KR102296305B1 (en) * 2014-06-11 2021-09-01 엘지이노텍 주식회사 Lens moving unit and camera module having the same
JP6785661B2 (en) * 2014-11-28 2020-11-18 日本電産コパル株式会社 Lens drive device
TWI578094B (en) * 2015-12-09 2017-04-11 台灣東電化股份有限公司 Optical image stabilization mechanism
TWI644128B (en) * 2016-03-29 2018-12-11 台灣東電化股份有限公司 Lens driving device
CN107656418B (en) * 2016-07-26 2020-04-28 宁波舜宇光电信息有限公司 Method for testing and calculating inclination of optical axis of focusing camera module
JP7320403B2 (en) * 2019-08-09 2023-08-03 ニデックインスツルメンツ株式会社 Optical unit with anti-shake function
CN110650290B (en) * 2019-10-12 2021-06-15 惠州市德赛自动化技术有限公司 Active focusing adjustment method for camera

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW555016U (en) * 2002-12-13 2003-09-21 Tekom Technologies Inc Lens structure with adjustable inclination
JP2010011042A (en) * 2008-06-26 2010-01-14 Acutelogic Corp Tilt correction method for imaging apparatus, and tilt-correcting apparatus
JP2014089265A (en) * 2012-10-29 2014-05-15 Sharp Corp Method to assemble camera module and camera module
CN102981683A (en) * 2012-12-10 2013-03-20 广东威创视讯科技股份有限公司 Rapid correction method and optical axis correction method for optical positioning block of camera
WO2016000874A1 (en) * 2014-07-01 2016-01-07 Fotonation Limited A method for calibrating an image capture device
CN106937028A (en) * 2015-12-30 2017-07-07 南昌欧菲光电技术有限公司 Camera module assemble method and camera module
CN106303264A (en) * 2016-11-04 2017-01-04 东莞佩斯讯光电技术有限公司 Controllable motor and the camera module of rapid focus sensor and control method is tilted based on camera lens
CN109116505A (en) * 2018-07-24 2019-01-01 深圳睿晟自动化技术有限公司 The optical axis bearing calibration of camera lens
CN110855856A (en) * 2018-08-21 2020-02-28 宁波舜宇光电信息有限公司 Assembling method of multi-group optical lens based on motor optical assembly
CN109361877A (en) * 2018-12-25 2019-02-19 信利光电股份有限公司 More camera module group arrangements and technique
CN110753172A (en) * 2019-10-22 2020-02-04 Oppo广东移动通信有限公司 Correction method and device, electronic equipment and voice coil motor

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