CN115940570A - Focusing motor, closed-loop control method of focusing motor and camera equipment - Google Patents
Focusing motor, closed-loop control method of focusing motor and camera equipment Download PDFInfo
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Abstract
The embodiment of the application relates to the technical field of camera shooting, and discloses a focusing motor, a closed-loop control method of the focusing motor and camera shooting equipment. The focusing motor of the present application includes: the rotor comprises a rotor support, at least three first polar plates, a second polar plate and a processing unit; at least three first polar plates are sequentially arranged along the focusing direction; the processing unit is connected with each first polar plate and each second polar plate; the second polar plate and the at least three first polar plates are arranged oppositely, and the second polar plate and the at least three first polar plates form capacitors respectively; the rotor support moves along the focusing direction; under the condition that the rotor support moves along the focusing direction, the relative positions of the second polar plate and at least three first polar plates in the focusing direction are changed; the processing unit controls the rotor support to move in the focusing direction according to the capacitance signal of the capacitor; therefore, the precision of the closed-loop control of the focusing motor and the design of the size of the motor are both considered.
Description
Technical Field
The embodiment of the application relates to the technical field of camera shooting, in particular to a focusing motor, a closed-loop control method of the focusing motor and camera shooting equipment.
Background
With the development of the imaging technology, in order to quickly and stably implement focusing, most camera modules in the current imaging equipment generally adopt a closed-loop control method, detect the real-time position of a mover support in a focusing motor in the focusing process, and adjust the driving current for driving a lens according to the detected position of the mover support, so that the mover support can quickly reach an accurate focusing position.
In the related art, a motor structure as shown in fig. 1 and 2 is employed to drive a motor to move in a focusing direction.
According to the technical scheme of the camera motor, through the design of three polar plates, a first polar plate 1 and a second polar plate 2 are used as signal receiving polar plates, a third polar plate 3 is used as a signal transmitting polar plate, the capacitance signal detection of the rotor position of the camera motor is realized, and then the moving position of a rotor support can be well controlled to be more accurate through carrying out mathematical arithmetic processing on differential signals of the two receiving polar plates, so that the precision of closed-loop control of a focusing motor is improved; however, since the differential signal of the two receiving plates is used in this scheme, the left edge of the third plate 3 must be between the left edge and the right edge of the first plate 1, and the right edge of the third plate 3 must be between the left edge and the right edge of the first plate 1, that is, the mechanical stroke of the third plate 3 cannot exceed the length of any receiving plate in the focusing direction, therefore, the total length of the first plate 1 and the second plate 2 in the focusing direction should be greater than twice the mechanical stroke; when the mechanical stroke of the emitting plate required to move in the focal length direction is large, the total length of the first plate 1 and the second plate 2 in the focusing direction exceeds two mechanical strokes, which is not favorable for the size design of the motor.
In order to solve the technical problem in the technical scheme of fig. 1, in the technical scheme of fig. 2, the first pole plate 1 and the second pole plate 2 are spliced together into a rectangle by structurally improving the first pole plate 1 and the second pole plate 2; in the scheme, the first polar plate 1 and the second polar plate 2 are spliced together, so that even if the mechanical stroke of the emitting polar plate 3 which needs to move in the focal length direction is large, the total length of the first polar plate 1 and the second polar plate 2 in the focusing direction is still only the size of one mechanical stroke, and the small size of the motor can be ensured; however, in the technical scheme of fig. 2, when the differential signal of the two receiving plates is obtained, the sensitivity is 2a × cot θ, which is mainly determined by the size of the triangle bottom angle θ and the size a of the emitting plate 3 in the focusing direction, compared with fig. 1, the sensitivity of the differential signal is lower, the position for controlling the moving of the mover support is lower accurately, and the precision of the closed-loop control of the focusing motor is lower.
Therefore, the solutions in the related art cannot give consideration to the precision of the closed-loop control of the focus motor and the design of the motor size.
Disclosure of Invention
An object of the embodiments of the present application is to provide a focus motor, a closed-loop control method of the focus motor, and an image pickup apparatus, so as to achieve both the precision of the closed-loop control of the focus motor and the design of the motor size.
To solve the above technical problem, an embodiment of the present application provides a focus motor, including: the rotor comprises a rotor support, at least three first polar plates, a second polar plate and a processing unit; at least three first polar plates are sequentially arranged along the focusing direction; the processing unit is connected with each first polar plate and each second polar plate; the second polar plate and the at least three first polar plates are arranged oppositely, and the second polar plate and the at least three first polar plates form capacitors respectively; the rotor support moves along the focusing direction; under the condition that the rotor support moves along the focusing direction, the relative positions of the second polar plate and at least three first polar plates in the focusing direction are changed; and the processing unit controls the rotor support to move in the focusing direction according to the capacitance signal of the capacitor.
In some embodiments, the plurality of first electrode plates are sequentially connected in the focusing direction, and an insulating layer is disposed at a connection between the plurality of first electrode plates.
In some embodiments, the lengths of the first and second plates in the focusing direction are the same; the lengths of the first polar plates in the direction perpendicular to the focusing direction are the same.
In some embodiments, the first electrode plates are sequentially arranged at intervals in the focusing direction.
In some embodiments, the first lengths of the first electrode plates in the focusing direction are the same, and the lengths of the first electrode plates in the direction perpendicular to the focusing direction are the same; the distance between two adjacent first polar plates in the focusing direction is the same.
In some embodiments, a length of the second plate in the focusing direction is greater than or equal to a sum of the first length and two separation distances.
The technical scheme provided by the embodiment of the application has at least the following advantages:
compared with the scheme of the related technology, under the condition of the same mechanical stroke, the total distance of the at least three first polar plates in the focusing direction can be shorter, so that the overall volume of the focusing motor is reduced; meanwhile, because the polar plates are arranged in a rectangular mode, when the difference signals of the two first polar plates are processed by mathematical algorithm, the sensitivity of the difference signals is higher, the moving position of the rotor support can be well controlled to be more accurate, and the precision of closed-loop control of the focusing motor is improved; therefore, the precision of the closed-loop control of the focusing motor and the design of the size of the motor are considered.
Drawings
One or more embodiments are illustrated by way of example in the accompanying drawings which correspond to and are not to be construed as limiting the embodiments, in which elements having the same reference numeral designations represent like elements throughout, and in which the drawings are not to be construed as limiting in scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a focusing motor provided in the prior art;
FIG. 2 is a schematic diagram of a focusing motor provided in the prior art;
FIG. 3 is a cross-sectional view of a focus motor along a focusing direction according to an embodiment of the present application;
FIG. 4 is a view of a focusing motor according to an embodiment of the present application, looking at a first plate from the plane of a second plate;
FIG. 5 is a schematic diagram showing the changes of the capacitors 1, 2 and 3 during the operation of the second plate from top to bottom with respect to the first plate;
FIG. 6 is a schematic diagram showing the variation of the differential capacitance signals of the capacitor 1 and the capacitor 2 and the differential capacitance signals of the capacitor 2 and the capacitor 3 during the operation of the second plate from top to bottom with respect to the first plate;
FIG. 7 is a schematic diagram illustrating the variation of the differential capacitance and the displacement of the mover support during the operation of the second plate with respect to the first plate from top to bottom;
FIG. 8 is a view of a focus motor provided in accordance with an embodiment of the present application looking at a first plate from the plane of a second plate;
FIG. 9 is a schematic structural diagram of a focusing motor according to an embodiment of the present application, when viewed from a plane of a second plate, the first plate is a first plate;
FIG. 10 is a schematic flow chart diagram of a closed-loop control method for a focus motor according to an embodiment of the present application;
fig. 11 is a flow chart illustrating the sub-steps of step 202.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present invention, and the embodiments may be mutually incorporated and referred to without contradiction.
The embodiment of the application provides a focus motor, includes: the rotor comprises a rotor support, at least three first polar plates, a second polar plate and a processing unit; at least three first polar plates are sequentially arranged along the focusing direction; the processing unit is connected with each first polar plate and each second polar plate; the second polar plate and the at least three first polar plates are arranged oppositely, and form capacitors respectively; the rotor support moves along the focusing direction; under the condition that the rotor support moves along the focusing direction, the relative positions of the second polar plate and at least three first polar plates in the focusing direction are changed; and the processing unit controls the rotor support to move in the focusing direction according to the capacitance signal of the capacitor.
Compared with the technical scheme of fig. 1, under the condition of the same mechanical stroke, the total distance of the at least three first polar plates in the focusing direction of the present embodiment can be shorter, so that the overall volume of the focusing motor is reduced; meanwhile, because the shapes of the polar plates are set by adopting the traditional scheme, namely the mode in fig. 1, when the difference signals of the two first polar plates are processed by mathematical algorithm, compared with the mode in fig. 2, the sensitivity of the difference signals is higher, the moving position of the rotor support can be well controlled to be more accurate, and the precision of the closed-loop control of the focusing motor is higher; therefore, the precision of the closed-loop control of the focusing motor and the design of the size of the motor are both considered.
To make the objects, technical solutions and advantages of the embodiments of the present application clearer, the embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in the examples of the present application, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
The following embodiments are divided for convenience of description, and should not constitute any limitation to the specific implementation manner of the present application, and the embodiments may be mutually incorporated and referred to without contradiction.
An embodiment of the present invention relates to a focusing motor, as shown in fig. 3, which is a schematic cross-sectional view of the focusing motor along a focusing direction in the present embodiment, the focusing motor includes: a mover support 101, at least three first pole plates 102, a second pole plate 103, and a processing unit (not shown); at least three first polar plates 102 are sequentially arranged along the focusing direction; the processing unit is connected with each of the first polar plate 102 and the second polar plate 103; the second polar plate 103 is arranged opposite to the at least three first polar plates 102, and the second polar plate 103 and the at least three first polar plates 102 form capacitors respectively; the mover carriage 101 moves in the focusing direction; when the mover support 101 moves in the focusing direction, the relative positions of the second plate 103 and the at least three first plates 102 in the focusing direction change; the processing unit controls the mover support 101 to move in the focusing direction according to the capacitance signal of the capacitor.
It should be noted that, for convenience of explanation, fig. 3 sets the second pole plate 103 on the mover support 101, however, the first pole plates 102 may also be set on the mover support 101, as long as the relative positions of the second pole plate 103 and at least three first pole plates 102 in the focusing direction are changed when the mover support 101 moves in the focusing direction, and the structure in fig. 3 is only for the purpose of clarity of description of the present embodiment, and does not limit the scheme of the present embodiment at all.
The number of the first plates 102 is three in the present embodiment, and in practical applications, the number of the first plates 102 may be set to be three or more, which is only for convenience of explanation.
Referring to fig. 4, in order to view the first plate from the plane of the second plate, the first plate and the second plate in this embodiment are both rectangular, the second plate is disposed opposite to the three first plates in the figure, for convenience of description, the second plate is labeled as Tx, the three first plates are respectively denoted by Rx1, rx2, and Rx3 from top to bottom, and the second plate Tx and the three first plates Rx1, rx2, and Rx3 respectively form capacitors, which are respectively a capacitor 1, a capacitor 2, and a capacitor 3. The second polar plate Tx can move up and down relative to the first polar plates Rx1, rx2 and Rx3 in fig. 4, that is, the second polar plate Tx moves along with the mover support in the focusing direction; when the second plate Tx runs from top to bottom relative to the first plates Rx1, rx2, and Rx3, the capacitance values of the capacitor 1, the capacitor 2, and the capacitor 3 formed by the second plate Tx and the three first plates Rx1, rx2, and Rx3 are transformed accordingly.
Referring to fig. 5, a schematic diagram of changes of the capacitors 1, 2, and 3 during operation of the second plate Tx from top to bottom with respect to the first plates Rx1, rx2, and Rx3 is shown, where an abscissa is a displacement of the second plate Tx, i.e., a displacement of the mover support, where an upper edge of the second plate Tx starts to move in alignment with an upper edge of the Rx1 plate, and stops when a lower edge of the second plate Tx coincides with a lower edge of the Rx3 plate.
Specifically, when the upper edge of the Tx electrode plate is aligned with the upper edge of the Rx1 electrode plate, the relative area between the Tx electrode plate and the Rx1 electrode plate is larger, and the relative area between the Tx electrode plate and the Rx2 electrode plate is smaller, at this time, the capacitance value of the capacitor 1 is larger, and the capacitance value of the capacitor 2 is smaller; when the Tx polar plate moves downwards gradually, namely Tx is between Rx1 and Rx2, the relative area of the Tx polar plate and the Rx1 polar plate is reduced gradually, the relative area of the Tx polar plate and the Rx2 polar plate is increased gradually, the capacitance value of the capacitor 1 is reduced gradually, and the capacitance value of the capacitor 2 is increased gradually, at this time, tx and Rx3 have no projection area and only have edge effect, and the change sensitivity (slope) of the capacitor 3 is very small and almost unchanged and is close to zero; when the Tx pole plate is away from the Rx1 pole plate, the capacitance value of the capacitor 3 begins to change, when the Tx pole plate moves downwards gradually, namely Tx is between Rx2 and Rx3, tx and Rx1 have no projection area, the relative area of Tx at Rx2 is gradually reduced, the relative area of Tx between Rx3 is gradually increased, the change sensitivity (slope) of the capacitor 1 is small and close to zero, the capacitor 2 is gradually reduced, and the capacitor 3 is gradually increased.
Referring to fig. 6, a schematic diagram of the change of the differential capacitance signals of the capacitor 1 and the capacitor 2 and the differential capacitance signals of the capacitor 2 and the capacitor 3 during the operation of the second plate from top to bottom with respect to the first plate is shown. It can be seen that the two differential capacitance signals have a relatively large slope, and the two stroke segments with relatively large slopes are respectively the stroke segment where Tx has a projection area with Rx1 and Rx2 at the same time and the stroke segment where Tx has a projection area with Rx2 and Rx3 at the same time; therefore, in this embodiment, when Tx has a stroke section with a projection area with Rx1 and Rx2, capacitance differential signals of the capacitor 1 and the capacitor 2 are used, and when Tx has a stroke section with a projection area with Rx2 and Rx3, capacitance differential signals of the capacitor 2 and the capacitor 3 are used; in this embodiment, the differential capacitance signals of Rx1 and Rx2 and the differential capacitance signals of Rx2 and Rx3 in the two stroke segments are used as position signals, and the finally obtained schematic change diagram of the differential capacitance and the displacement of the mover support is shown in fig. 7 and is arranged periodically, so that the large sensitivity characteristic of the rectangular scheme can be ensured, and the advantages of the differential algorithm can be maintained.
It should be noted that if the focusing motor needs a larger mechanical stroke, a larger number of first plates may be provided, for example, as shown in fig. 8, in order to view the first plates from the plane where the second plates are located, rx4 is provided below Rx1, rx2, and Rx3, rx4 may also be a plate connected to the same capacitance signal as Rx1, when five first plates need to be provided, rx5 may be continuously provided below Rx4, rx5 is a plate connected to the same capacitance signal as Rx2, when six first plates need to be provided, rx6 may be continuously provided below Rx5, and Rx6 is a plate connected to the same capacitance signal as Rx3, so as to periodically arrange Rx1, rx2, and Rx3.
In some embodiments, the plurality of first pole plates are sequentially arranged at intervals in the focusing direction. As shown in fig. 4, in this embodiment, the first electrode plates Rx1, rx2, and Rx3 are arranged at intervals, so that the adjacent first electrode plates can be isolated as much as possible, signals between the first electrode plates Rx1, rx2, and Rx3 are prevented from interfering with each other, and stability of capacitance signals between Rx1, rx2, and Rx3 is improved.
In some embodiments, the first lengths of the plurality of first pole plates in the focusing direction are the same, and the lengths of the plurality of first pole plates in the direction perpendicular to the focusing direction are the same; the distance between two adjacent first polar plates in the focusing direction is the same. In the embodiment, all the first polar plates are set to be the same in size, and the lengths and the spacing distances of the second polar plate and the first polar plates in the focusing direction are set to be the same, so that the calculation process is simpler and more convenient when differential calculation is performed, and the calculation accuracy is improved.
In some embodiments, the length of the second plate in the focus direction is greater than or equal to the sum of the first length and the two separation distances.
With such an arrangement, in the case that the second polar plate Tx moves from top to bottom, when the upper edge of the second polar plate Tx is about to leave the Rx1, the lower edge of the second polar plate Tx just contacts with the upper edge of the Rx 3; if the length of the second pole plate Tx in the focusing direction is short, when the upper edge of the second pole plate Tx is about to leave Rx1, a distance still exists between the lower edge of the second pole plate Tx and the upper edge of Rx3, and within the distance, the second pole plate Tx only covers Rx2, and at this time, the capacitor 2 is not changed, so that the focusing motor cannot accurately control the mover support to move in the focusing direction according to the change of the capacitor; therefore, in the embodiment, by setting the length of the second pole plate Tx in the focusing direction to be greater than or equal to the sum of the first length and the two separation distances, the capacitance signal can be changed when the second pole plate Tx moves from top to bottom, so that the focusing motor can accurately control the moving of the mover support in the focusing direction.
In some embodiments, the plurality of first electrode plates are sequentially connected in the focusing direction, and an insulating layer is disposed at a connection between the plurality of first electrode plates. As shown in fig. 9, which is a schematic structural diagram of the focusing motor of this embodiment when the first polar plate is viewed from a plane where the second polar plate is located, three first polar plates Rx1, rx2, and Rx3 shown in fig. 9 are sequentially connected in a focusing direction, wherein an insulating layer (not shown) is disposed at a connection position between Rx1 and Rx2, and an insulating layer (not shown) is also disposed at a connection position between Rx2 and Rx3, and the thickness of the insulating layer is very thin and can be ignored. In this embodiment, the plurality of first electrode plates are sequentially connected in the focusing direction and are provided with the insulating layers, so that the first electrode plates Rx1, rx2 and Rx3 can be isolated, mutual interference among capacitance signals among the plurality of first electrode plates Rx1, rx2 and Rx3 is avoided, and the stability of the capacitance signals among the plurality of first electrode plates Rx1, rx2 and Rx3 is ensured while the size of the focusing motor is reduced as much as possible.
In some embodiments, the lengths of the plurality of first polar plates and the plurality of second polar plates in the focusing direction are the same; the lengths of the plurality of first polar plates in the direction perpendicular to the focusing direction are the same. In the embodiment, the sizes of all the first polar plates are set to be the same, and the lengths of the second polar plate and the first polar plate in the focusing direction are set to be the same, so that the calculation process is simpler and more convenient when difference calculation is performed, and the calculation accuracy is improved.
In the embodiment, at least three first electrode plates are arranged, a second electrode plate is arranged opposite to each second electrode plate to form a capacitor, and the distance that the second electrode plate and the at least three first electrode plates can move relatively in the focusing direction, that is, the mechanical stroke is the sum of the total length of the at least three first electrode plates in the focusing direction minus the length of the second electrode plate in the focusing direction, compared with the technical scheme of fig. 1, the total distance of the at least three first electrode plates in the focusing direction can be shorter under the condition of the same mechanical stroke, so that the overall volume of the focusing motor is reduced; meanwhile, because the shape of the polar plates is set by adopting the traditional scheme, namely the mode in fig. 1, when the difference signals of the two first polar plates are processed by mathematical algorithm, compared with the mode in fig. 2, the sensitivity of the difference signals is higher, the moving position of the rotor support can be well controlled to be more accurate, and the precision of the closed-loop control of the focusing motor is higher; therefore, the precision of the closed-loop control of the focusing motor and the design of the size of the motor are both considered.
Another aspect of the embodiments of the present application further provides a closed-loop control method for a focus motor, which is applied to a processing unit of the focus motor; as shown in fig. 10, which is a flowchart illustrating a closed-loop control method of a focus motor of the present embodiment, the closed-loop control method of the focus motor includes the following steps:
Specifically, in the present embodiment, the capacitance differential signal is obtained in a segmented manner, and referring to fig. 6 and fig. 7, when Tx has a stroke segment with a projection area with Rx1 and Rx2, the capacitance differential signal of the capacitor 1 and the capacitor 2 is used, and when Tx has a stroke segment with a projection area with Rx2 and Rx3, the capacitance differential signal of the capacitor 2 and the capacitor 3 is used; in each stroke segment, only the capacitance of the first plate having the projection with the second plate is used to calculate the differential signal, so that in this embodiment, it is required to determine two first plates having the projection with the second plate as projection plates first, and obtain the capacitance signal of the capacitance formed by each projection plate and the second plate, thereby facilitating the subsequent differential calculation.
And step 202, judging whether the position of the rotor support coincides with a target position according to the two projection pole plates and the capacitance signal. And if so, finishing the movement of the rotor support.
If not, the step 203 is executed, the mover support is controlled to continue to move by increasing or decreasing the output driving current or driving voltage, the step 201 is returned, and the judgment of the step 202 is repeated until the position of the mover support is determined to coincide with the target position, so that the movement of the mover support is completed.
In some embodiments, step 202, determining whether the position of the mover support coincides with the target position according to the two projection plates and the capacitance signal, where the specific sub-steps are as shown in fig. 11, and include:
In step 2024, it is determined whether the operation result is the same as the target capacitance value. If yes, entering step 2026, and judging that the position of the rotor support is overlapped with the target position; if not, the process goes to step 2025, and it is determined that the position of the mover support does not coincide with the target position.
Specifically, in this embodiment, a capacitance differential signal is obtained in a segmented manner, and a schematic diagram of a variation of a finally obtained differential capacitance signal and a displacement of a mover support is shown in fig. 7, and a plurality of corresponding abscissa points, that is, mover support displacement points, exist for the same target capacitance value, but in each differential signal period shown in fig. 7, corresponding two projection plates are different, so that in this embodiment, the corresponding two target projection plates are determined according to a target position, it is determined first whether a projection plate at a current position is consistent with the target projection plate, then a difference between capacitances of the two projection plates and a second plate is calculated, and the difference is compared with the target capacitance value, thereby accurately determining whether a position of the mover support coincides with the target position.
In some embodiments, the correspondence between the position and the capacitance value pre-stored in step 2021 can be obtained by: moving the mover support to the bottom of the focusing motor; controlling the rotor support to move step by step at preset intervals, and determining the distance between the rotor support and the bottom of the focusing motor after each movement; determining two projection polar plates according to the distance between the mover support and the bottom of the focusing motor after each movement; recording capacitance signals of the capacitance formed by the two projection polar plates and the second polar plate; performing preset operation according to the two capacitance signals to obtain corresponding capacitance values; and taking the corresponding relation between the distance between the rotor support and the bottom and the capacitance value after each movement as the corresponding relation between the position and the capacitance value. The corresponding relationship between the position and the capacitance value finally obtained in this embodiment is shown in fig. 7, and is arranged periodically, two projection electrode plates exist in each period, and the difference value between two capacitances between the two projection electrode plates and the second electrode plate forms a curve of the period.
The steps of the above methods are divided for clarity, and the implementation may be combined into one step or split some steps, and the steps are divided into multiple steps, so long as the same logical relationship is included, which are all within the protection scope of the present patent; it is within the scope of the patent to add insignificant modifications to the algorithms or processes or to introduce insignificant design changes to the core design without changing the algorithms or processes.
Another aspect of the embodiments of the present application further provides an image capturing apparatus, including: the lens is used for driving the focusing motor of the lens.
Compared with the related art, the image capturing apparatus according to the fifth embodiment of the present invention is provided with the focusing motor according to the previous embodiment, and therefore, the image capturing apparatus also has the technical effects of the previous embodiment, which is not described herein again.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific to implementations of the invention, and that various changes in form and detail may be made therein without departing from the spirit and scope of the invention in practice.
Claims (10)
1. A focus motor, comprising: the rotor comprises a rotor support, at least three first polar plates, a second polar plate and a processing unit; at least three first polar plates are sequentially arranged along the focusing direction; the processing unit is connected with each first polar plate and each second polar plate;
the second polar plate and the at least three first polar plates are arranged oppositely, and the second polar plate and the at least three first polar plates form capacitors respectively; the rotor support moves along the focusing direction; under the condition that the rotor support moves along the focusing direction, the relative positions of the second polar plate and at least three first polar plates in the focusing direction are changed;
and the processing unit controls the rotor support to move in the focusing direction according to the capacitance signal of the capacitor.
2. The focusing motor of claim 1, wherein a plurality of the first pole plates are connected in sequence in the focusing direction, and an insulating layer is disposed at a connection between the plurality of the first pole plates.
3. The focus motor of claim 2, wherein the first and second plates have the same length in the focus direction; the lengths of the first polar plates in the direction perpendicular to the focusing direction are the same.
4. The focus motor of claim 1, wherein a plurality of the first pole plates are arranged at intervals in the focus direction in sequence.
5. The focus motor of claim 4, wherein the first lengths of the first plates in the focus direction are the same, and the lengths of the first plates perpendicular to the focus direction are the same; the distance between two adjacent first polar plates in the focusing direction is the same.
6. The focus motor of claim 5, wherein the length of the second plate in the focus direction is greater than or equal to the sum of the first length and two separation distances.
7. A closed-loop control method of a focus motor, characterized by being applied to the processing unit of the focus motor of any one of claims 1 to 6; the method comprises the following steps:
after the rotor support moves along the focusing direction, determining two first polar plates which have projection with the second polar plate as projection polar plates and capacitance signals of capacitance formed by each projection polar plate and the second polar plate in the direction perpendicular to the plane where the second polar plate is located;
judging whether the position of the rotor support is coincident with a target position or not according to the two projection polar plates and the capacitance signal;
and if the position of the rotor support is not overlapped, controlling the rotor support to move again along the focusing direction until the position of the rotor support is judged to be overlapped with the target position.
8. The closed-loop control method for the focus motor according to claim 7, wherein determining whether the position of the mover support coincides with the target position according to the two projection electrode plates and the capacitance signal comprises:
determining a capacitance value corresponding to the target position as a target capacitance value according to a pre-stored corresponding relationship between the position and the capacitance value, and determining two corresponding target projection polar plates according to the target position;
judging whether the two projection polar plates are consistent with the two target projection polar plates or not;
if yes, performing preset operation according to the capacitance signal to obtain an operation result;
and judging whether the position of the rotor support coincides with the target position or not according to whether the operation result is the same as the target capacitance value or not.
9. The closed-loop control method for the focus motor according to claim 8, wherein the corresponding relationship between the position and the capacitance is obtained by:
moving the mover carriage to a bottom of the focusing motor;
controlling the rotor support to move step by step at preset intervals, and determining the distance between the rotor support and the bottom of the focusing motor after each movement;
determining two projection polar plates according to the distance between the mover support and the bottom of the focusing motor after each movement;
recording capacitance signals of capacitances formed by the two projection polar plates and the second polar plate;
performing preset operation according to the two capacitance signals to obtain corresponding capacitance values;
and taking the distance between the rotor support and the bottom and the corresponding relation between the capacitance values after each movement as the corresponding relation between the positions and the capacitance values.
10. An image pickup apparatus characterized by comprising: lens barrel, focus motor according to any of claims 1 to 6 for driving the lens barrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310142473.4A CN115940570B (en) | 2023-02-13 | 2023-02-13 | Focusing motor, closed-loop control method of focusing motor and image pickup apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310142473.4A CN115940570B (en) | 2023-02-13 | 2023-02-13 | Focusing motor, closed-loop control method of focusing motor and image pickup apparatus |
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| CN117674537A (en) * | 2024-01-30 | 2024-03-08 | 基合半导体（宁波）有限公司 | Focus motor, closed-loop control method of focus motor, and camera equipment |
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