CN219041575U - Anti-shake motor, camera module and electronic equipment - Google Patents

Abstract

The utility model provides an anti-shake motor, a camera module and electronic equipment, wherein the anti-shake motor comprises a base, an anti-shake bracket, first to fourth transmitting polar plates and first to fourth receiving polar plates, and the first transmitting polar plate and the first receiving polar plate form a first capacitor; the second receiving polar plate and the first receiving polar plate are arranged at intervals in the first direction, and the second transmitting polar plate and the second receiving polar plate form a second capacitor; the third transmitting polar plate and the third receiving polar plate form a third capacitor; the fourth receiving polar plate and the third receiving polar plate are arranged at intervals in the second direction, and the fourth transmitting polar plate and the fourth receiving polar plate form a fourth capacitor. The differential polar plate design is adopted in the first direction and the second direction, the position in the direction is determined by utilizing the differential value of the capacitance signals of the two capacitors in each direction, so that the influence of the polar plate distance change is reduced, and the differential polar plate design enables the detection result to be more robust and the detection result to be more accurate.

Description

Anti-shake motor, camera module and electronic equipment

Technical Field

The embodiment of the utility model relates to the technical field of camera shooting, in particular to an anti-shake motor, a camera shooting module and electronic equipment.

Background

Along with the continuous updating of electronic products, the requirement of users for photographing the electronic products is also higher. In order to improve photographing performance of electronic products, an optical anti-shake (OIS, optical image stabilization) function is usually provided in a camera module of the electronic products. In the camera module with the optical anti-shake function, the anti-shake motor drives the lens to move along the vertical direction of the optical axis so as to compensate the influence of shake during photographing on the imaging quality of the camera module.

In order to realize closed-loop control in the anti-shake motor, in some cases, a hall sensor (hall) or a driving IC (Integrated Circuit ) with a hall detection function, and a sensing magnet are built in the anti-shake motor to detect movement of the lens in the vertical direction of the optical axis. The proposal has a plurality of defects, such as that the hall and the magnet occupy the internal space of the motor, which is not only unfavorable for the miniaturization of the motor, but also has the limitation of the volume of the driving part and is unfavorable for improving the driving force of the anti-shake motor; the mode of detecting the magnetic induction intensity is easy to be interfered by an external magnetic field, and the closed-loop control precision of the motor is interfered; the temperature change causes the expansion with heat and contraction with cold of parts, and the distance between the magnet and the hall is changed, so that the signal precision is reduced.

Some anti-shake motors have a capacitance structure provided in an X-Y direction perpendicular to an optical axis, and only one capacitance structure is provided in each direction (X, Y), and displacement in the X and Y directions is detected by using an area change of the capacitance structure. The scheme also has a plurality of defects, for example, the anti-shake motor has random dynamic inclination in actual use, because the polar plate in the capacitor structure is not positioned at the inclined rotation center, the distance of the polar plate can be changed (become larger or smaller), even if the projection area is the same, the capacitance value can be different, and thus the position can not be accurately judged; after thermal expansion and cold contraction of the anti-shake motor under the conditions of reliability or high temperature and low temperature, the distance of the polar plate can be changed, and even if the projection areas are the same, the capacitance value can be different, so that the position and the like cannot be accurately judged.

Disclosure of Invention

The utility model aims to provide an anti-shake motor, an imaging module and electronic equipment, and aims to realize accurate detection of the position in the vertical direction of an optical axis by optimizing a capacitance structure of the anti-shake motor, and reduce the influence of the distance after reliability and the random dynamic inclination on the position judgment accuracy.

In order to solve the above technical problems, an embodiment of the present utility model provides an anti-shake motor, including:

a base;

the anti-shake support can be movably arranged on the base;

the first transmitting polar plate and the first receiving polar plate are respectively arranged on the anti-shake support and the base, and the first transmitting polar plate and the first receiving polar plate form a first capacitor;

the second transmitting polar plate and the second receiving polar plate are respectively arranged on the anti-shake support and the base, the second receiving polar plate and the first receiving polar plate are arranged at intervals in the first direction, and the second transmitting polar plate and the second receiving polar plate form a second capacitor;

the third transmitting polar plate and the third receiving polar plate are respectively arranged on the anti-shake support and the base, and form a third capacitor;

the fourth transmitting polar plate and the fourth receiving polar plate are respectively arranged on the anti-shake support and the base, the fourth receiving polar plate and the third receiving polar plate are arranged at intervals in the second direction, and the fourth transmitting polar plate and the fourth receiving polar plate form a fourth capacitor;

the differential value of the capacitance signal of the first capacitor and the capacitance signal of the second capacitor is used for determining the position of the anti-shake support in the first direction, and the differential value of the capacitance signal of the third capacitor and the capacitance signal of the fourth capacitor is used for determining the position of the anti-shake support in the second direction.

According to the anti-shake motor provided by the embodiment of the utility model, the differential polar plate design is adopted in the first direction and the second direction, two capacitors are formed in the first direction and the second direction, and the positions in the directions are determined by utilizing the differential values of capacitance signals of the two capacitors in each direction, so that the influence of polar plate distance change is reduced, and the differential polar plate design enables the detection result to be more robust and more accurate.

Preferably, in the anti-shake motor, the first receiving polar plate and the second receiving polar plate are respectively disposed at two ends of the base in the first direction, and the first transmitting polar plate and the second transmitting polar plate are respectively disposed at two ends of the anti-shake bracket in the first direction.

Preferably, in the anti-shake motor, the third receiving polar plate and the fourth receiving polar plate are respectively disposed at two ends of the base in the second direction, and the third transmitting polar plate and the fourth transmitting polar plate are respectively disposed at two ends of the anti-shake bracket in the second direction.

Preferably, in the anti-shake motor, the first receiving polar plate and the second receiving polar plate are both disposed at the same end of the base in the first direction, and the first transmitting polar plate and the second transmitting polar plate are both disposed at the same end of the anti-shake support in the first direction.

Preferably, in the anti-shake motor, the first transmitting electrode plate and the second transmitting electrode plate are integrally formed.

Preferably, in the anti-shake motor, the third receiving polar plate and the fourth receiving polar plate are both disposed at the same end of the base in the second direction, and the third transmitting polar plate and the fourth transmitting polar plate are both disposed at the same end of the anti-shake support in the second direction.

Preferably, in the anti-shake motor, the third transmitting electrode plate and the fourth transmitting electrode plate are integrally formed.

Preferably, in the anti-shake motor, the first transmitting electrode plate and the first receiving electrode plate are both arranged to extend along the second direction.

Preferably, in the anti-shake motor, the second transmitting electrode plate and the second receiving electrode plate are both arranged to extend along the second direction.

Preferably, in the anti-shake motor, the third transmitting electrode plate and the third receiving electrode plate are both disposed to extend along the first direction.

Preferably, in the anti-shake motor, the fourth transmitting electrode plate and the fourth receiving electrode plate are both disposed to extend along the first direction.

Preferably, in the anti-shake motor, the first transmitting electrode plate, the second transmitting electrode plate, the third transmitting electrode plate and the fourth transmitting electrode plate are integrally formed.

Preferably, in the anti-shake motor, a difference value between the capacitance signal of the first capacitor and the capacitance signal of the second capacitor is equal to a quotient of a difference between the capacitance signals of the first capacitor and the second capacitor and a sum of the capacitance signals of the first capacitor and the second capacitor.

Preferably, in the anti-shake motor, a difference value between the capacitance signal of the third capacitor and the capacitance signal of the fourth capacitor is equal to a quotient of a difference between the capacitance signals of the third capacitor and the fourth capacitor and a sum of the capacitance signals of the third capacitor and the fourth capacitor.

In order to achieve the above object, the present utility model further provides an image capturing module, including:

an anti-shake motor, which is the anti-shake motor described above;

the lens is arranged on an anti-shake bracket in the anti-shake motor;

the driving plate is electrically connected with a first capacitor, a second capacitor, a third capacitor and a fourth capacitor in the anti-shake motor and is used for determining the position of the anti-shake support in the first direction according to the differential value of the capacitance signal of the first capacitor and the capacitance signal of the third capacitor; and determining the position of the anti-shake support in the second direction according to the differential value of the capacitance signal of the third capacitor and the capacitance signal of the fourth capacitor.

In order to achieve the above purpose, the utility model also provides an electronic device, which comprises the camera module.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

FIG. 1 is a schematic diagram of an anti-shake motor according to a first embodiment of the utility model;

FIG. 2 is a cross-sectional view of the anti-shake motor of FIG. 1;

FIG. 3 is a distribution diagram of a polar plate of the anti-shake motor of FIG. 1;

FIG. 4 is a schematic diagram illustrating operation of the anti-shake motor of FIG. 1;

FIG. 5 is a schematic diagram illustrating the operation of an anti-shake motor according to a second embodiment of the utility model;

FIG. 6 is a distribution diagram of a polar plate of the anti-shake motor of FIG. 5;

FIG. 7 is a schematic view of the anti-shake motor of FIG. 5 at a base;

fig. 8 is a schematic structural view of the anti-shake motor in fig. 5 at the anti-shake bracket.

The utility model is described by reference numerals:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Anti-shake motor	22	Second transmitting polar plate
1	Base seat	23	Third transmitting polar plate
				11	First receiving polar plate	24	Fourth transmitting polar plate
12	Second receiving polar plate	3	Circuit board
				13	Third receiving polar plate	4	Spring plate
14	Fourth receiving polar plate	5	Suspension wire
				2	Anti-shake support	6	Lens holder
21	First emitter plate

The achievement of the objects, functional features and advantages of the present utility model will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present utility model, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present utility model, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.

In the conventional capacitor structure in the anti-shake motor, only one capacitor structure is arranged in each direction (X direction or Y direction), and according to a capacitance formula C=epsilon×S/(4pi×k×d), epsilon is dielectric constant of a medium, k is electrostatic force constant, S is the opposite area of two polar plates, and d is the vertical distance between the two polar plates. As described above, when the distance d is changed, the capacitance C is changed even if the area S is not changed, and thus the position determination is severely disturbed.

C for each directional unipolar plate design, home position ₀ ＝ε*S ₀ /(4pi.k.d.), C after distance change _0’ ＝ε*S ₀ /(4pi.k.d'), then C _0’ /C ₀ The percentage of deviation of the position information depends on the amount of change of the distance d. The error caused by the design of the monopole plate is excessive, the position error is 200um, and the common XY stroke of the anti-shake motor is 100-300 um. This unipolar plate design is an unstable design for engineering applications, since only a single signal, no other signal can be used for compensation.

In view of the above, the present utility model provides an anti-shake motor that can be applied to an image capturing module of an electronic device such as a mobile phone, wherein fig. 1 to 4 show a first embodiment of the anti-shake motor provided by the present utility model, and fig. 5 to 8 show a second embodiment of the anti-shake motor provided by the present utility model.

Referring to fig. 1 to 3, the anti-shake motor 100 includes a base 1, an anti-shake bracket 2, a first transmitting plate 21, a first receiving plate 11, a second transmitting plate 22, a second receiving plate 12, a third transmitting plate 23, a third receiving plate 13, a fourth transmitting plate 24, and a fourth receiving plate 14.

Referring to fig. 1 and 2, an anti-shake support 2 is movably disposed on a base 1.

Specifically, the middle part of the anti-shake support 2 is generally used for fixing a lens (not shown in the drawings), for example, the middle part of the anti-shake support 2 is provided with a lens support 6, and the lens can be fixed on the lens support 6. The anti-shake support 2 is movably provided on the base 1 in a direction perpendicular to an optical axis of the lens. The optical axis direction of the lens is defined as up and down below, and then the anti-shake support 2 can move in a horizontal plane with respect to the base 1.

The specific arrangement mode of the movable connection structure between the anti-shake support 2 and the base 1 is not particularly limited, and optionally, referring to fig. 1 and 2, in the first embodiment, the base 1 is located at the lower side of the anti-shake support 2, four elastic pieces 4 are respectively disposed at four corners of the upper end of the anti-shake support 2, each elastic piece 4 is connected with the base 1 through a suspension wire 5 extending vertically, and the anti-shake support 2 can move in a suspended manner in a horizontal plane under the combined action of the four elastic pieces 4 and the four suspension wires 5.

A driving mechanism (not shown in the figure) is usually disposed between the anti-shake support 2 and the base 1, where the driving mechanism is used to drive the anti-shake support 2 to move relative to the base 1, and a specific manner of the driving mechanism is not limited, for example, the driving mechanism may include a coil and a magnet, and the anti-shake support 2 is driven by an electromagnetic force formed by the coil and the magnet; for another example, the driving mechanism may also include a memory metal member, and the anti-shake support 2 is driven by using the expansion and contraction performance of the memory metal as power; for another example, the driving mechanism may also include a piezoelectric ceramic member, and the anti-shake support 2 is driven by using the piezoelectric ceramic as power.

Alternatively, in the first embodiment, magnets and coils are provided at each of the four corners of the anti-shake support 2.

Alternatively, referring to fig. 1 and 2, in the first embodiment, the anti-shake motor 100 includes a circuit board 3, and the base 1 is disposed on an upper surface of the circuit board 3, and the anti-shake motor 100 can be powered through the circuit board 3.

Further, in the first embodiment, one suspension wire 5 is electrically connected to the circuit board 3, the first transmitting electrode plate 21, the second transmitting electrode plate 22, the third transmitting electrode plate 23, and the fourth transmitting electrode plate 24, so that power can be supplied to four transmitting electrode plates by using one suspension wire 5 to form four electrodes.

Alternatively, in the first embodiment, two suspension wires 5 are electrically connected to the circuit board 3, one coil, so that power can be supplied to one coil by using two suspension wires 5, wherein the suspension wires 5 supplying power to the coils and the suspension wires 5 supplying power to the emitter plates are different suspension wires 5, that is, two of the four suspension wires 5 are electrically connected to the circuit board 3, one coil for supplying power to one coil, while one of the remaining two is electrically connected to the circuit board 3, the first emitter plate 21, the second emitter plate 22, the third emitter plate 23, the fourth emitter plate 24 for supplying power to the four emitter plates.

Referring to fig. 2 to 4, a first transmitting plate 21 and a first receiving plate 11 are respectively disposed on the anti-shake support 2 and the base 1, and the first transmitting plate 21 and the first receiving plate 11 form a first capacitor; the second transmitting polar plate 22 and the second receiving polar plate 12 are respectively arranged on the anti-shake bracket 2 and the base 1, the second receiving polar plate 12 and the first receiving polar plate 11 are arranged at intervals in the first direction, and the second transmitting polar plate 22 and the second receiving polar plate 12 form a second capacitor.

Specifically, one of the base 1 and the anti-shake support 2 is provided with a first receiving polar plate 11 and a second receiving polar plate 12, and the other of the base 1 and the anti-shake support 2 is provided with a first transmitting polar plate 21 and a second transmitting polar plate 22. A first receiving polar plate 11 and a second receiving polar plate 12 are arranged on the base 1, and a first transmitting polar plate 21 and a second transmitting polar plate 22 are arranged on the anti-shake bracket 2; the anti-shake support 2 may be provided with a first receiving polar plate 11 and a second receiving polar plate 12, and the base 1 is provided with a first transmitting polar plate 21 and a second transmitting polar plate 22. The first receiving electrode plate 11 and the second receiving electrode plate 12 are disposed on the base 1, and the first transmitting electrode plate 21 and the second transmitting electrode plate 22 are disposed on the anti-shake support 2 will be described below as an example.

The first receiving polar plate 11 is upwards arranged on the base 1, the first transmitting polar plate 21 is downwards arranged on the anti-shake support 2, and at least part of the first transmitting polar plate 21 is vertically opposite to the first receiving polar plate 11, so that the first transmitting polar plate 21 and the first receiving polar plate 11 form a first capacitor.

The second receiving polar plate 12 is upwards arranged on the base 1, the second transmitting polar plate 22 is downwards arranged on the anti-shake bracket 2, and at least part of the second transmitting polar plate 22 is vertically opposite to the second receiving polar plate 12, so that the second transmitting polar plate 22 and the second receiving polar plate 12 form a second capacitor.

The second receiving electrode plate 12 and the first receiving electrode plate 11 are arranged at intervals in a first direction, the first direction is a direction perpendicular to the optical axis of the lens, the first direction is defined as a left-right direction below, and one side of the second receiving electrode plate 12 close to the first receiving electrode plate 11 is defined as a left side of the second receiving electrode plate 12.

The first transmitting plate 21 and the first receiving plate 11 form a first capacitor, and the shape of the first transmitting plate 21 is generally adapted to the shape of the first receiving plate 11, alternatively, referring to fig. 3, in the first embodiment, the first transmitting plate 21 and the first receiving plate 11 are both disposed to extend along the second direction.

Specifically, the second direction is a direction perpendicular to the optical axis of the lens, and intersects the first direction, for example, the second direction is perpendicular or approximately perpendicular to the first direction, and the second direction is defined as a front-rear direction hereinafter.

Referring to fig. 3, in the first embodiment, the first transmitting electrode plate 21 and the first receiving electrode plate 11 are both disposed in a rectangular shape, and for example, the first transmitting electrode plate 21 and the first receiving electrode plate 11 are both disposed in a square shape.

Likewise, the second transmitting plate 22 and the second receiving plate 12 form a second capacitor, and the shape of the second transmitting plate 22 is generally adapted to the shape of the second receiving plate 12, alternatively, referring to fig. 3, in the first embodiment, the second transmitting plate 22 and the second receiving plate 12 are both disposed to extend along the second direction. The second transmitting electrode plate 22 and the second receiving electrode plate 12 are also disposed in a strip shape extending along the front-rear direction, for example, referring to fig. 3, in the first embodiment, the second transmitting electrode plate 22 and the second receiving electrode plate 12 are disposed in a square strip shape.

The first receiving electrode plate 11 and the second receiving electrode plate 12 are disposed on the base 1 at left and right intervals, and various specific arrangements of the first receiving electrode plate 11 and the second receiving electrode plate 12 on the base 1 may be adopted, alternatively, referring to fig. 2 to 4, in the first embodiment, the first receiving electrode plate 11 and the second receiving electrode plate 12 are respectively disposed at two ends of the base 1 in the first direction, and the first transmitting electrode plate 21 and the second transmitting electrode plate 22 are respectively disposed at two ends of the anti-shake support 2 in the first direction. The first receiving polar plate 11 is arranged at the left end of the base 1, the second receiving polar plate 12 is arranged at the right end of the base 1, the first transmitting polar plate 21 is arranged at the left end of the anti-shake support 2 corresponding to the first receiving polar plate 11, and the second transmitting polar plate 22 is arranged at the right end of the anti-shake support 2 corresponding to the second receiving polar plate 12.

Alternatively, referring to fig. 6 to 8, in the second embodiment, the first receiving electrode plate 11 and the second receiving electrode plate 12 are disposed at the same end of the base 1 in the first direction, and the first transmitting electrode plate 21 and the second transmitting electrode plate 22 are disposed at the same end of the anti-shake bracket 2 in the first direction. The first receiving polar plate 11 and the second receiving polar plate 12 are both arranged at the left end or the right end of the base 1, and correspondingly, the first transmitting polar plate 21 and the second transmitting polar plate 22 are both arranged at the left end or the right end of the anti-shake bracket 2.

For example, referring to fig. 6 to 8, in the second embodiment, the first receiving electrode plate 11 and the second receiving electrode plate 12 are both disposed at the right end of the base 1, and correspondingly, the first transmitting electrode plate 21 and the second transmitting electrode plate 22 are both disposed at the right end of the anti-shake bracket 2.

In the case that the first transmitting electrode plate 21 and the second transmitting electrode plate 22 are disposed at the same end of the anti-shake support 2, the first transmitting electrode plate 21 and the second transmitting electrode plate 22 may be disposed at a left-right interval; the first transmitting electrode plate 21 and the second transmitting electrode plate 22 may be connected left and right.

Alternatively, referring to fig. 5, 6 and 8, in the second embodiment, the first emitter plate 21 and the second emitter plate 22 are integrally formed. I.e. the first emitter plate 21 and the second emitter plate 22 are the left half and the right half of one plate, respectively.

For example, referring to fig. 5, 6 and 8, in the second embodiment, the right end of the anti-shake support 2 is provided with a first polar plate facing downward, the left half of the first polar plate is opposite to the first receiving polar plate 11 from top to bottom, so that the left half of the first polar plate forms a first transmitting polar plate 21, and the right half of the first polar plate is opposite to the second receiving polar plate 12 from top to bottom, so that the right half of the first polar plate forms a second transmitting polar plate 22.

Referring to fig. 3 and 6, a third transmitting electrode plate 23 and a third receiving electrode plate 13 are respectively disposed on the anti-shake support 2 and the base 1, and the third transmitting electrode plate 23 and the third receiving electrode plate 13 form a third capacitor; the fourth transmitting electrode plate 24 and the fourth receiving electrode plate 14 are respectively arranged on the anti-shake support 2 and the base 1, the fourth receiving electrode plate 14 and the third receiving electrode plate 13 are arranged at intervals in the second direction, and the fourth transmitting electrode plate 24 and the fourth receiving electrode plate 14 form a fourth capacitor.

Specifically, one of the base 1 and the anti-shake support 2 is provided with a third receiving polar plate 13 and a fourth receiving polar plate 14, and the other of the base 1 and the anti-shake support 2 is provided with a third transmitting polar plate 23 and a fourth transmitting polar plate 24. A third receiving polar plate 13 and a fourth receiving polar plate 14 are arranged on the base 1, and a third transmitting polar plate 23 and a fourth transmitting polar plate 24 are arranged on the anti-shake bracket 2; the anti-shake support 2 may also be provided with a third receiving polar plate 13 and a fourth receiving polar plate 14, and the base 1 is provided with a third transmitting polar plate 23 and a fourth transmitting polar plate 24. The third receiving electrode plate 13 and the fourth receiving electrode plate 14 are disposed on the base 1, and the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 are disposed on the anti-shake support 2 will be described below as an example.

The third receiving polar plate 13 is upwards arranged on the base 1, the third transmitting polar plate 23 is downwards arranged on the anti-shake bracket 2, and at least part of the third transmitting polar plate 23 is vertically opposite to the third receiving polar plate 13, so that the third transmitting polar plate 23 and the third receiving polar plate 13 form a third capacitor.

The fourth receiving electrode plate 14 is disposed on the base 1 upward, the fourth transmitting electrode plate 24 is disposed on the anti-shake support 2 downward, and at least a portion of the fourth transmitting electrode plate 24 is vertically opposite to the fourth receiving electrode plate 14, so that the fourth transmitting electrode plate 24 and the fourth receiving electrode plate 14 form a fourth capacitor.

The fourth receiving electrode plate 14 and the third receiving electrode plate 13 are arranged at intervals in the second direction, and the side, close to the third receiving electrode plate 13, of the fourth receiving electrode plate 14 is defined as the front side of the fourth receiving electrode plate 14.

The third transmitting plate 23 and the third receiving plate 13 form a third capacitor, and the shape of the third transmitting plate 23 is generally adapted to the shape of the third receiving plate 13, alternatively, referring to fig. 3, in the first embodiment, the third transmitting plate 23 and the third receiving plate 13 are both arranged to extend along the first direction. The third transmitting electrode plate 23 and the third receiving electrode plate 13 are disposed in a strip shape extending along the left-right direction, for example, referring to fig. 3, in the first embodiment, the third transmitting electrode plate 23 and the third receiving electrode plate 13 are disposed in a square strip shape.

Similarly, the fourth transmitting plate 24 and the fourth receiving plate 14 form a fourth capacitor, and the shape of the fourth transmitting plate 24 and the shape of the fourth receiving plate 14 are generally adapted, alternatively, referring to fig. 3, in the first embodiment, the fourth transmitting plate 24 and the fourth receiving plate 14 are both disposed to extend along the first direction. The fourth transmitting electrode plate 24 and the fourth receiving electrode plate 14 are also disposed in a strip shape extending along the left-right direction, for example, referring to fig. 3, in the first embodiment, the fourth transmitting electrode plate 24 and the fourth receiving electrode plate 14 are disposed in a square strip shape.

The third receiving electrode plate 13 and the fourth receiving electrode plate 14 are disposed on the base 1 at intervals from front to back, and various specific arrangements of the third receiving electrode plate 13 and the fourth receiving electrode plate 14 on the base 1 may be adopted, alternatively, referring to fig. 3, in the first embodiment, the third receiving electrode plate 13 and the fourth receiving electrode plate 14 are respectively disposed at two ends of the base 1 in the second direction, and the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 are respectively disposed at two ends of the anti-shake bracket 2 in the second direction. The third receiving polar plate 13 is disposed at the front end of the base 1, the fourth receiving polar plate 14 is disposed at the rear end of the base 1, the third transmitting polar plate 23 is disposed at the front end of the anti-shake support 2 corresponding to the third receiving polar plate 13, and the fourth transmitting polar plate 24 is disposed at the rear end of the anti-shake support 2 corresponding to the fourth receiving polar plate 14.

As can be seen from the above, referring to fig. 3, in the first embodiment, the first transmitting electrode plate 21, the second transmitting electrode plate 22, the third transmitting electrode plate 23, and the fourth transmitting electrode plate 24 are respectively disposed at the left end, the right end, the front end, and the rear end of the anti-shake support 2. Optionally, referring to fig. 3, in the first embodiment, the first transmitting electrode plate 21, the second transmitting electrode plate 22, the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 sequentially pass through first electrical connection wires (not shown in the figure), so that the first transmitting electrode plate 21, the second transmitting electrode plate 22, the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 are conducted through four first electrical connection wires to form a whole, thereby facilitating power supply to the first transmitting electrode plate 21, the second transmitting electrode plate 22, the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24.

For example, referring to fig. 3, in the first embodiment, the first transmitting electrode plate 21, the second transmitting electrode plate 22, the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 are integrally formed, and the first electrical connection lines may be the same as the materials of the transmitting electrode plates, and the first transmitting electrode plate 21, the second transmitting electrode plate 22, the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 are integrally formed by four first electrical connection lines.

Alternatively, referring to fig. 6 to 8, in the second embodiment, the third receiving plate 13 and the fourth receiving plate 14 are disposed at the same end of the base 1 in the second direction, and the third transmitting plate 23 and the fourth transmitting plate 24 are disposed at the same end of the anti-shake bracket 2 in the second direction. The third receiving polar plate 13 and the fourth receiving polar plate 14 are both arranged at the front end or the rear end of the base 1, and correspondingly, the third transmitting polar plate 23 and the fourth transmitting polar plate 24 are both arranged at the front end or the rear end of the anti-shake bracket 2.

For example, referring to fig. 6 to 8, in the second embodiment, the third receiving plate 13 and the fourth receiving plate 14 are both disposed at the front end of the base 1, and correspondingly, the third transmitting plate 23 and the fourth transmitting plate 24 are both disposed at the front end of the anti-shake bracket 2.

In the case that the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 are disposed at the same end of the anti-shake support 2, the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 may be disposed at intervals in front-back direction; the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 may be connected in front-back. Alternatively, referring to fig. 6 and 8, in the second embodiment, the third transmitting plate 23 and the fourth transmitting plate 24 are integrally formed. Namely, the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 are respectively a front half part and a rear half part of one electrode plate.

For example, referring to fig. 6 and 8, in the second embodiment, the front end of the anti-shake support 2 is provided with a second polar plate facing downward, the front half of the second polar plate is opposite to the third receiving polar plate 13 up and down, so that the front half of the second polar plate forms a third transmitting polar plate 23, and the rear half of the second polar plate is opposite to the fourth receiving polar plate 14 up and down, so that the rear half of the second polar plate forms a fourth transmitting polar plate 24.

As can be seen from fig. 6 and 8, in the second embodiment, the first polar plate and the second polar plate are respectively disposed at the right end and the front end of the anti-shake bracket 2. Alternatively, referring to fig. 6 and 8, in the second embodiment, the first and second plates are connected by a second electrical connection line (not shown in the drawings), so that the first and second plates are connected by the second electrical connection line to form a whole, thereby facilitating power supply to the first and second plates (i.e., the first, second, third and fourth transmitting plates 21, 22, 23, 24).

For example, referring to fig. 6 and 8, in the second embodiment, the first transmitting electrode plate 21, the second transmitting electrode plate 22, the third transmitting electrode plate 23 and the fourth transmitting electrode plate 24 are integrally formed, and the second electrical connection line may be made of the same material as the first electrode plate and the second electrode plate, and the first electrode plate and the second electrode plate are integrally formed through the second electrical connection line.

The first transmitting polar plate 21 and the first receiving polar plate 11 form a first capacitor, the second transmitting polar plate 22 and the second receiving polar plate 12 form a second capacitor, and the differential value of the capacitance signal of the first capacitor and the capacitance signal of the second capacitor is used for determining the position of the anti-shake bracket 2 in the first direction; and the third transmitting polar plate 23 and the third receiving polar plate 13 form a third capacitor, the fourth transmitting polar plate 24 and the fourth receiving polar plate 14 form a fourth capacitor, and the differential value of the capacitance signal of the third capacitor and the capacitance signal of the fourth capacitor is used for determining the position of the anti-shake support 2 in the second direction.

Specifically, two capacitance signals are formed in both the first direction and the second direction. When the anti-shake support 2 moves along the first direction or the second direction, the capacitance in the corresponding direction changes correspondingly due to the area change of the transmitting polar plate and the receiving polar plate caused by the displacement in the first direction or the second direction, so that the position of the anti-shake support 2 in the horizontal plane can be determined by the capacitance value.

Meanwhile, the first transmitting electrode plate 21 and the first receiving electrode plate 11, the second transmitting electrode plate 22 and the second receiving electrode plate 12, the third transmitting electrode plate 23 and the third receiving electrode plate 13, and the fourth transmitting electrode plate 24 and the fourth receiving electrode plate 14 can cover the strokes of the whole anti-shake support 2 in the first direction and the second direction in the moving direction. The first capacitor and the second capacitor can form linear signal change when moving in the first direction, and the position in the first direction is truly reflected. When the third capacitor and the fourth capacitor move in the first direction, the polar plates of the third capacitor and the fourth capacitor also have position changes in the first direction, but through the size difference design of the areas, the projection area is unchanged in the whole first direction of the polar plates of the third capacitor and the fourth capacitor, so that the signals in the second direction are unchanged, and the mutual interference of the position signals corresponding to the capacitors in the first direction and the second direction is avoided.

The anti-shake motor 100 adopts a differential polar plate design in the first direction and the second direction, mainly considering the polar plate distance change caused by the reliability impact or high-temperature thermal expansion and cold contraction of the anti-shake motor 100, and the influence of the distance change caused by the random dynamic inclination angle on the signal during the movement, wherein the distance change caused by the random dynamic inclination angle is shown in fig. 4 and 6.

And compensating position errors caused by the change of the distance of the polar plate in practical application and the change of the dynamic inclination angle in the motion process by utilizing the differential value of the two capacitance signals in the first direction or the second direction. The difference value of the two capacitance signals is equal to the quotient of the difference between the two capacitance signals and the sum of the two capacitance signals, that is, the difference value of the two capacitance signals can be calculated by performing a difference and a sum operation on the two capacitance signals, and dividing the difference by the sum or dividing the sum by the difference.

Specifically, the capacitance signal C of the first capacitance ₁ Capacitance signal C with the second capacitance ₂ The differential value of (2) may be equal to the difference C between the capacitance signals of the first and second capacitances ₁ -C ₂ Sum of capacitance signals C of the first capacitor and the second capacitor ₁ +C ₂ Quotient of (C) ₁ And C ₂ Is equal to (C) ₁ -C ₂ )/(C ₁ +C ₂ ) Or C ₁ And C ₂ Is equal to (C) ₁ +C ₂ )/(C ₁ -C ₂ )。

Similarly, the capacitance signal C of the third capacitor ₃ Capacitance signal C with fourth capacitance ₄ The difference value of (2) may be equal to the difference C between the capacitance signals of the third and fourth capacitances ₃ -C ₄ Sum C of capacitance signals of the third capacitor and the fourth capacitor ₃ +C ₄ Quotient of (C) ₃ And C ₄ Is equal to (C) ₃ -C ₄ )/(C ₃ +C ₄ ) Or C ₃ And C ₄ Is equal to (C) ₃ +C ₄ )/(C ₃ -C ₄ )。

Taking the first direction as an example, at the same position, a first capacitor C at the original position ₁ ＝ε*S ₁ /(4pi.k.d.), the second capacitor C ₂ ＝ε*S ₂ /(4pi.k.d.), C after distance change _1’ ＝ε*S ₁ /(4π*k*d’)，C _2’ ＝ε*S ₂ /(4pi.k.d'). By C _cal ＝(C ₁ -C ₂ )/(C ₁ +C ₂ ) As the position information, original position information: c (C) _cal ＝(S ₁ -S ₂ )/(S ₁ +S ₂ ) Other ginseng (radix Ginseng)The numbers are offset. C after distance change _cal ’＝(S ₁ -S ₂ )/(S ₁ +S ₂ ) Consistent with the prior variation, namely the influence of the integral change d of the distance is eliminated, the design of the differential polar plate has strong robustness.

The influence of the distance variation on the signal caused by the random dynamic tilt angle is more complex, and the two different differential designs as shown in fig. 3 and 6 also need to consider the actual engineering application scene and the error after the compensation algorithm.

The differential plate design shown in fig. 3 is relatively generic for the compensation effect of random dynamic tilt angles. However, the differential plate design shown in fig. 3 may still be used for the anti-shake motor 100 with a small dynamic tilt angle, depending on the design of the anti-shake motor 100 itself. The differential polar plate design shown in fig. 6 has better compensation effect on the random dynamic inclination angle, has small error and meets the engineering requirement.

The utility model also provides a camera module which can be applied to electronic equipment such as mobile phones and the like, and the camera module comprises an anti-shake motor.

Optionally, the camera module further includes a lens and a driving plate 3, where the lens is disposed on an anti-shake bracket 2 in the anti-shake motor 100; the driving board is electrically connected with a first capacitor, a second capacitor, a third capacitor and a fourth capacitor in the anti-shake motor 100, and the circuit board is used for determining the position of the anti-shake support 2 in the first direction according to the differential value of the capacitance signal of the first capacitor and the capacitance signal of the third capacitor; and determining the position of the anti-shake support 2 in the second direction according to the differential value of the capacitance signal of the third capacitor and the capacitance signal of the fourth capacitor.

Specifically, the lens may be fixed to the lens holder 6. The driving board may be the circuit board 3, and the circuit board 3 is provided with a driving chip to form a driving board; the driving board may be a single circuit board, and the driving board is electrically connected to the first capacitor, the second capacitor, the third capacitor and the fourth capacitor through the circuit board 3.

The utility model also provides electronic equipment which can be a mobile phone, a tablet personal computer and the like, and the electronic equipment comprises a camera module.

The foregoing description of the preferred embodiments of the present utility model should not be construed as limiting the scope of the utility model, but rather should be understood to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the utility model as defined by the following description and drawings or any application directly or indirectly to other relevant art(s).

Claims (10)

1. An anti-shake motor, comprising:

a base;

the anti-shake support can be movably arranged on the base;

the first transmitting polar plate and the first receiving polar plate are respectively arranged on the anti-shake support and the base, and the first transmitting polar plate and the first receiving polar plate form a first capacitor;

the second transmitting polar plate and the second receiving polar plate are respectively arranged on the anti-shake support and the base, the second receiving polar plate and the first receiving polar plate are arranged at intervals in the first direction, and the second transmitting polar plate and the second receiving polar plate form a second capacitor;

the third transmitting polar plate and the third receiving polar plate are respectively arranged on the anti-shake support and the base, and form a third capacitor;

the fourth transmitting polar plate and the fourth receiving polar plate are respectively arranged on the anti-shake support and the base, the fourth receiving polar plate and the third receiving polar plate are arranged at intervals in the second direction, and the fourth transmitting polar plate and the fourth receiving polar plate form a fourth capacitor;

the differential value of the capacitance signal of the first capacitor and the capacitance signal of the second capacitor is used for determining the position of the anti-shake support in the first direction, and the differential value of the capacitance signal of the third capacitor and the capacitance signal of the fourth capacitor is used for determining the position of the anti-shake support in the second direction.

2. The anti-shake motor of claim 1, wherein the first receiving electrode plate and the second receiving electrode plate are respectively disposed at two ends of the base in the first direction, and the first transmitting electrode plate and the second transmitting electrode plate are respectively disposed at two ends of the anti-shake bracket in the first direction; and/or the number of the groups of groups,

the third receiving polar plate and the fourth receiving polar plate are respectively arranged at two ends of the base in the second direction, and the third transmitting polar plate and the fourth transmitting polar plate are respectively arranged at two ends of the anti-shake support in the second direction.

3. The anti-shake motor of claim 1, wherein the first and second receiving plates are disposed at a same end of the base in the first direction, and the first and second transmitting plates are disposed at a same end of the anti-shake bracket in the first direction.

4. The anti-shake motor of claim 3 wherein the first emitter plate is integrally formed with the second emitter plate.

5. The anti-shake motor of claim 1, wherein the third receiving electrode plate and the fourth receiving electrode plate are both disposed at the same end of the base in the second direction, and the third transmitting electrode plate and the fourth transmitting electrode plate are both disposed at the same end of the anti-shake bracket in the second direction.

6. The anti-shake motor of claim 5 wherein the third emitter plate is integrally formed with the fourth emitter plate.

7. The anti-shake motor of any of claims 1-6, wherein the first, second, third, and fourth emitter plates are integrally formed.

8. The anti-shake motor according to any one of claims 1 to 6, wherein a differential value of the capacitance signal of the first capacitor and the capacitance signal of the second capacitor is equal to a quotient of a difference between the capacitance signals of the first capacitor and the second capacitor and a sum of the capacitance signals of the first capacitor and the second capacitor; and/or the number of the groups of groups,

the difference value of the capacitance signal of the third capacitor and the capacitance signal of the fourth capacitor is equal to the quotient of the difference between the capacitance signals of the third capacitor and the fourth capacitor and the sum of the capacitance signals of the third capacitor and the fourth capacitor.

9. A camera module, comprising:

an anti-shake motor according to any one of claims 1 to 8;

the lens is arranged on an anti-shake bracket in the anti-shake motor;

the driving plate is electrically connected with a first capacitor, a second capacitor, a third capacitor and a fourth capacitor in the anti-shake motor and is used for determining the position of the anti-shake support in the first direction according to the differential value of the capacitance signal of the first capacitor and the capacitance signal of the third capacitor; and determining the position of the anti-shake support in the second direction according to the differential value of the capacitance signal of the third capacitor and the capacitance signal of the fourth capacitor.

10. An electronic device comprising the camera module of claim 9.

Images