CN218413016U

CN218413016U - Optical actuator, camera module and mobile terminal

Info

Publication number: CN218413016U
Application number: CN202222584225.9U
Authority: CN
Inventors: 黄晓敏; 董怿
Original assignee: Beijing Kelifor Technology Co ltd
Current assignee: Beijing Kelifor Technology Co ltd
Priority date: 2022-09-28
Filing date: 2022-09-28
Publication date: 2023-01-31
Anticipated expiration: 2032-09-28

Abstract

The optical actuator comprises a fixed unit and a carrier, wherein one of the fixed unit and the carrier is provided with four fixed polar plates, and the projections of the four fixed polar plates in a jitter compensation plane are distributed in a 2 x 2 rectangular array; the other is provided with a movable polar plate which is parallel to the four fixed polar plates at intervals; the four fixed polar plates and the four movable polar plates are respectively and electrically connected with the corresponding adaptor, so that the four fixed polar plates and the movable polar plates form a capacitance sensor respectively; the projection of the movable polar plate in the jitter compensation plane is respectively staggered with the projection of the four fixed polar plates in the jitter compensation plane, and the sum of the staggered areas is unchanged. According to the change situation of the capacitance values of the four capacitance sensors and the sum of the capacitance values of the four sensors, the displacement of the movable unit in the shake compensation plane and the focusing direction can be indirectly obtained, the displacement of the movable unit in the three directions can be detected in real time only by matching five polar plates, the space is saved, and the cost is low.

Description

Optical actuator, camera module and mobile terminal

Technical Field

The present disclosure relates to the field of electronic imaging, and in particular, to an optical actuator, an imaging module, and a mobile terminal.

Background

In the field of electronic device imaging, in order to improve imaging quality, an optical device in an imaging module is usually movable, for example, focusing motion or shake compensation motion is performed, and in a motion process, a carrier on which a lens or a chip is mounted needs to move along a preset direction to meet imaging requirements.

In the relevant motion process, in order to guarantee imaging quality, need carry out accurate closed-loop control to this motion process, avoid this motion process's displacement too much or not enough, there is the correlation technique in order to realize accurate control to the displacement of the motion piece of this process, set up hall displacement sensor on the motion piece usually, utilize the displacement of electromagnetism principle detection part, however because some make a video recording the drive of motion piece itself in the module comes from the electromagnetic force, hall displacement sensor is in the external magnetic field of the module of making a video recording promptly, lead to it to be disturbed by this external magnetic field easily, influence the accuracy of measurement.

In the related art, the capacitive sensor can also be used to detect displacement without being affected by a magnetic field. However, since the OIS displacement in two directions and the AF movement in the focus direction are involved in the optical anti-shake movement, it is necessary to provide capacitance sensors for the displacements in three directions, respectively, which results in a complicated internal structure and high production cost.

SUMMERY OF THE UTILITY MODEL

An object of the present disclosure is to provide an optical actuator, a camera module, and a mobile terminal to at least partially solve the problems in the related art.

In order to achieve the above object, the present disclosure provides an optical actuator, including a fixed unit and a carrier for mounting an optical device, the carrier moving in a shake compensation plane and in a focusing direction relative to the fixed unit, one of the fixed unit and the carrier being provided with four fixed plates respectively parallel to the shake compensation plane, and projections of the four fixed plates in the shake compensation plane are distributed in a 2 × 2 rectangular array, and the other is provided with a movable plate parallel to and spaced from the four fixed plates; the optical actuator also comprises a plurality of conductive adapters which are arranged on the fixed unit and used for being connected to a circuit board, and the four fixed polar plates and the four movable polar plates are respectively electrically connected with the corresponding adapters so as to form a capacitive sensor with the four fixed polar plates and the four movable polar plates; when the carrier moves, the projections of the movable polar plate in the jitter compensation plane are respectively staggered with the projections of the four fixed polar plates in the jitter compensation plane, and the sum of the staggered areas is unchanged.

Optionally, four of the stator plates are coplanar.

Optionally, the carrier is configured to move in a first direction and a second direction perpendicular to each other in a jitter compensation plane, respectively, wherein the four fixed plates are arranged in an aligned array in the first direction and the second direction.

Optionally, the movable polar plate is configured to be rectangular, the outer contours of the four fixed polar plates respectively include first right angles formed by two perpendicular right-angle sides, and the projections of the movable polar plate in the shake compensation plane are respectively staggered with the projections of the four first right angles in the shake compensation plane.

Optionally, the four fixed pole plates and the four movable pole plates are configured to be square with the same size.

Optionally, the optical actuator further includes a frame, the carrier is configured to move in the focusing direction relative to the frame and configured to move in the shake compensation plane along with the frame relative to the fixed unit, wherein an elastically deformable spring wire is connected between the carrier and the frame for supporting the carrier, a first spring plate is fixed on the carrier, a second spring plate is fixed on the frame, and two ends of the spring wire are respectively connected to the first spring plate and the second spring plate.

Optionally, the fixed pole plate is disposed on the fixed unit, the movable pole plate is disposed on the carrier, and the optical actuator further includes a first connecting arm electrically connected between the movable pole plate and the first spring plate, and a second connecting arm electrically connected between the second spring plate and the adaptor.

Optionally, the unit cell includes a main body and a plurality of pillars formed at a position close to an edge of the main body, an adaptor for electrically connecting the movable plate extends from the main body to the pillars, terminals electrically connected to the adaptor are formed on the pillars, and the second connecting arm electrically connects the terminals.

Optionally, the optical actuator further comprises four third connecting arms electrically connected between the fixed pole plate and the adaptor, respectively.

Optionally, a plurality of balls for supporting relative movement are provided between the stator unit and the frame.

Alternatively, the fixed unit and the frame are configured in a square shape, wherein a plurality of balls are distributed at positions of the fixed unit and the frame near three corners, and the four fixed pole plates and the four movable pole plates are respectively disposed at positions near the other corner.

Optionally, the optical actuator further comprises: the focusing and shaking compensating device comprises an AF coil surrounding the circumference of the carrier, a power magnet fixed on the frame and an OIS coil fixed on the fixed unit, wherein the power magnet is used for generating focusing driving force and shaking compensating driving force respectively in cooperation with the AF coil and the OIS coil.

According to a second aspect of the present disclosure, there is provided a camera module comprising an optical device and the above optical actuator.

According to a third aspect of the present disclosure, a mobile terminal is provided, which includes the camera module.

By the technical scheme, the change conditions of the capacitance values of the four capacitance sensors are calculated, so that the displacement of the carrier in a jitter compensation plane can be detected in real time; meanwhile, the change condition of the sum of the capacitance values of the four capacitance sensors is calculated, and the displacement of the carrier in the focusing direction can be detected in real time. Therefore, the motion displacement of the carrier in three directions in the focusing direction and the shake compensation plane can be detected in real time only by matching five polar plates, so that the internal space of the actuator can be effectively saved, and the production cost can be reduced.

Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure without limiting the disclosure. In the drawings:

FIG. 1 is an exploded view of an optical actuator according to the present disclosure;

FIG. 2 is an exploded view of an optical actuator according to the present disclosure;

FIG. 3 is a schematic view of an optical actuator according to an exemplary illustration of the present disclosure;

FIG. 4 is a partially schematic illustration of an optical actuator according to an exemplary illustration of the present disclosure;

FIG. 5 is a schematic view of one plate combination illustratively shown according to the present disclosure;

FIG. 6 is a schematic view of one plate combination illustratively shown according to the present disclosure;

FIG. 7 is a schematic view of a camera module according to an exemplary illustration of the present disclosure;

fig. 8 is a schematic diagram of a mobile terminal exemplarily shown in accordance with the present disclosure.

Description of the reference numerals

10-mer; 11-a body; 12-a column; a 121-terminal; 21-a frame; 22-a carrier; 301-a first right angle; 31-fixing the polar plate; 311-a first fixed polar plate; 312-a second fixed polar plate; 313-a third fixed polar plate; 314-a fourth fixed polar plate; 32-moving pole plate; 40-an adaptor; 50-a ball bearing; 61-a first reed; 62-a second reed; 63-spring wire; 71-a first connecting arm; 72-a second connecting arm; 73-a third connecting arm; 81-AF coil; 82-a power magnet; 83-OIS coil; 90-optical device.

Detailed Description

The following detailed description of specific embodiments of the present disclosure is provided in connection with the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present disclosure, are given by way of illustration and explanation only, not limitation.

In the present disclosure, unless otherwise stated, the use of the directional terms "inside and outside" should be understood based on the application environment of the relevant component, which may be defined based on the actual use direction of the relevant component, or may be based on the self-profile of the component. For example: the projection of the stationary plate "within" the shake compensation plane refers to the projection of the stationary plate on the shake compensation plane in a direction perpendicular to the shake compensation plane.

In addition, in the present disclosure, the terms "first", "second", and the like are used for distinguishing one element from another, without order or importance. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated.

First, it should be noted that in the embodiment of the present disclosure, the focusing direction may be perpendicular to the shake compensation plane, for example, when the carrier performs a movement in the focusing direction, the carrier may perform a linear movement in a direction indicated by an arrow Z in fig. 1 or fig. 2; when the carrier moves in the shake compensation plane, the carrier can move in multiple directions (e.g., a first direction and a second direction as will be described later) in the shake compensation plane as needed, for example, in the embodiment of the present disclosure, the carrier can move linearly in two directions along the directions indicated by the arrow X and the arrow Y in fig. 1 or 2, respectively, to complete optical compensation. In some embodiments, the X-direction and the Y-direction may be perpendicular to each other. In other embodiments, the angle between the two anti-shake motion directions (X direction and Y direction) can also be designed adaptively according to actual requirements, for example, the angle between the two can be 45 °, 80 °, and the like, which will not be explained repeatedly below.

Referring to fig. 1 to 6, the present disclosure provides an optical actuator including a fixed unit 10 and a carrier 22 for mounting an optical device, which moves in a shake compensation plane and in a focusing direction with respect to the fixed unit 10, wherein four fixed plates 31 are disposed on one of the fixed unit 10 and the carrier 22, respectively, in parallel with the shake compensation plane, and projections of the four fixed plates 31 in the shake compensation plane are distributed in a 2 × 2 rectangular array. Here, it should be explained that the 2 × 2 rectangular array arrangement does not mean that the central lines of the four stator plates 31 are standard rectangles, but it is only necessary to arrange them in a substantially 2 × 2 rectangular shape. The other is provided with a movable polar plate 32 which is parallel to the four fixed polar plates 31 at intervals; the optical actuator further comprises a plurality of electrically conductive adaptors 40 arranged on the stator unit 10 for connection to a circuit board, which may be an IC chip, either internal or external to the optical actuator. The four fixed polar plates 31 and the four movable polar plates 32 are respectively and electrically connected with the corresponding adaptor 40, so that the four fixed polar plates 31 and the four movable polar plates 32 form a capacitance sensor respectively; the movable plate 32 is configured such that, when the carrier 22 moves, projections on the shake compensation plane are respectively staggered from projections of the four fixed plates 31 on the shake compensation plane, and the sum of staggered areas is not changed.

First, it should be noted that the above-mentioned "fixed plate" and "movable plate" are relative, and it is not necessary that the fixed plate 31 is fixed and the movable plate 32 is movable, and the two are only required to be movable and fixed, and have relative movement, for example, in the embodiment of the present disclosure, four fixed plates 31 may be disposed on the unit cell 10 (the fixed plates 31 are fixed), and the movable plate 32 may be disposed on the carrier 22. (the moving plate 32 moves with the carrier 22). In addition, in other embodiments, the fixed plate 31 may be fixed on the carrier 22, and the movable plate 32 is fixed on the fixed unit 10, in which case the fixed plate 31 follows the carrier 22 and the movable plate 32 is fixed on the fixed unit 10. For convenience of description, the following description will be made by taking an embodiment in which the fixed plate 31 is fixed on the fixed unit 10 and the movable plate 32 is fixed on the carrier 22, and details of the other case will not be described.

The present disclosure also does not limit the material of the fixed and

movable plates

31 and 32, and may be, for example, a galvanized iron plate, a galvanized copper plate, or an aluminum plate, as long as it can electrically connect the adaptor 40 to form a capacitive sensor.

The adaptor 40 of the present disclosure is not limited as long as it can electrically connect the fixed electrode plate 31 or the movable electrode plate 32 corresponding thereto, and electrically connect the conductive Circuit Board of the fixed electrode plate 31 or the movable electrode plate 32 to form a capacitive sensor, for example, the adaptor 40 may be an FPC (flexible Printed Circuit Board) or a PCB (Printed Circuit Board) mounted on the fixed unit 10, or may be a spring piece formed by bending or pressing.

The movable plate 32 is configured such that when moving with the carrier 22, the projections in the shake compensation plane are respectively staggered with the projections of the four fixed plates 31 in the shake compensation plane, and the sum of the staggered areas is not changed, which means that when the movable plate 32 moves, the projections in the shake compensation plane are respectively overlapped with the projections of the four fixed plates 31 in the shake compensation plane, and the sum of the areas of the overlapped parts of the movable plate 32 and the four fixed plates 31 is not changed during the movement. In the embodiment shown in fig. 5, the outer contour of the movable pole plate 32 does not exceed the overall outer contour formed by the four fixed pole plates 31 during movement.

For facilitating understanding of the above technical solutions, referring to fig. 5, in the embodiment, the four fixed plates 31 are respectively a first fixed plate 311, a second fixed plate 312, a third fixed plate 313 and a fourth fixed plate 314, and in the embodiment, the first fixed plate 311, the second fixed plate 312, the third fixed plate 313 and the fourth fixed plate 314 and the movable plate 32 respectively form a first capacitance sensor, a second capacitance sensor, a third capacitance sensor and a fourth capacitance sensor.

Referring to fig. 1-2, in order to facilitate the circuit board to analyze the capacitance values of the four capacitive sensors, in the embodiment of the present disclosure, the four fixed plates 31 may be coplanar. Therefore, the distance d between the two polar plates of the four capacitive sensors can be ensured to be consistent, the calculation processing of the circuit board is convenient, and the space is saved by the arrangement mode, so that the interior of the actuator is more compact and simpler.

The following description will be made on how the optical actuator can specifically detect the motion of the carrier 22 in real time, and for the sake of understanding, the four fixed plates 31 are coplanar.

Regarding the movement in the focusing direction:

according to a capacitance measuring formula: capacitance value C = epsilon S/4 pi kd (epsilon is relative dielectric constant, S is the positive area of the capacitance plate, k is electrostatic force constant, and d is the distance of the capacitance plate), by using the above technical scheme, because the sum of the projection of the movable plate 32 in the jitter compensation plane and the superposition part of the projection of the four fixed plates 31 in the jitter compensation plane is not changed, namely the sum of the positive areas S of the four groups of capacitance sensors is quantitative, and epsilon and k mentioned in the capacitance calculation formula are also quantitative, only d is a variable, a processor (the processor can be installed on the circuit board, and can also be arranged outside the optical actuator, for example, integrated on the main board of the mobile terminal) electrically connected to the circuit board can indirectly obtain the distance change between the movable plate 32 and the fixed plates 31 by analyzing and calculating the change condition of the sum of the capacitance values of the four capacitance sensors, so as to realize the real-time measurement of the displacement of the carrier 22 installed with the movable plate 32. Since the sum of the overlapping areas S of the projections of the four movable electrode plates 32 and the fixed electrode plate 31 in the shake compensation plane does not change during the focusing movement, when the displacement of the focusing movement is measured, the accuracy of the measurement is not affected when the carrier 22 moves relative to the fixed unit 10 in the plane perpendicular to the focusing direction. In the case where the four fixed plates 31 are coplanar, the sum of the capacitance values of the four capacitance sensors is not changed when the carrier 22 performs the shake compensation movement, so that the displacement thereof in the focusing direction can be calculated only from the change of the sum. If the four fixed plates 31 are not coplanar, the determination needs to be made by combining the sum of the capacitance values of the four capacitive sensors with the change in capacitance value of each capacitive sensor as will be described below.

Regarding the movement in the anti-shake plane:

according to a capacitance measuring formula: capacitance C = S/4 pi kd (e is the relative dielectric constant, S is the facing area of the capacitor plate, k is the electrostatic force constant, and d is the distance of the capacitor plate). When the capacitance sensor is applied to displacement monitoring in the shake compensation direction, since the relative movement directions of the relatively moving part (carrier 22) and the relatively fixed part (unit cell 10) are not unique, it is difficult to determine the movement direction when the facing area S changes, and thus it is difficult to acquire the actual displacement by the conventional capacitance sensor. In the embodiment of the present disclosure, because the four movable electrode plates 32 are parallel to the fixed electrode plate 31, when the movable electrode plate 32 moves in the shake compensation plane, distances d between the first fixed electrode plate 311, the second fixed electrode plate 312, the third fixed electrode plate 313, and the fourth fixed electrode plate 314 and the movable electrode plate 32 are all quantitative, epsilon and k mentioned in the capacitance calculation formula are also quantitative, and only S is a variable, the circuit board can indirectly obtain the displacement of the movable electrode plate 32 in the shake compensation plane by processing the variation of the capacitance values of the four capacitance sensors, specifically, referring to fig. 5:

(1) when the movable polar plate 32 moves towards the left, the facing areas S1 and S2 between the movable polar plate 32 and the first and second fixed

polar plates

311 and 312 are increased, that is, the first capacitance value C1 of the first capacitive sensor and the second capacitance value C2 of the second capacitive sensor are increased; the facing areas S3 and S4 between the movable plate 32 and the third and fourth

fixed plates

313 and 314 are reduced, that is, the third capacitance C3 of the third capacitive sensor and the fourth capacitance C4 of the fourth capacitive sensor are reduced, and the variation amounts of the first capacitance C1, the second capacitance C2, the third capacitance C3 and the fourth capacitance C4 are the same.

(2) When the movable polar plate 32 moves towards the right, the facing areas S1 and S2 between the movable polar plate 32 and the first and second fixed

polar plates

311 and 312 are reduced, that is, the first and second capacitance values C1 and C2 are reduced; the facing areas S3 and S4 between the movable plate 32 and the third and fourth

fixed plates

313 and 314 are increased, that is, the third and fourth capacitance values C3 and C4 are increased, and the variation amounts of the first, second, third and fourth capacitance values C1, C2, C3 and C4 are the same.

(3) When the movable polar plate 32 moves upwards, the facing areas S1 and S3 between the movable polar plate 32 and the first and third fixed

polar plates

311 and 313 are increased, that is, the first and third capacitance values C1 and C3 are increased; the facing areas S2 and S4 between the movable plate 32 and the second and fourth

fixed plates

312 and 314 are reduced, i.e. the second and fourth capacitance values C2 and C4 are reduced, and the variation amounts of the first, second, third and fourth capacitance values C1, C2, C3 and C4 are the same.

(4) When the movable polar plate 32 moves downward, the facing areas S1 and S3 between the movable polar plate 32 and the first and third fixed

polar plates

311 and 313 decrease, that is, the first and third capacitance values C1 and C3 decrease; the facing areas S2 and S4 between the movable plate 32 and the second and fourth

fixed plates

312 and 314 are increased, i.e. the second and fourth capacitance values C2 and C4 are increased, and the variation amounts of the first, second, third and fourth capacitance values C1, C2, C3 and C4 are the same.

(5) When the movable polar plate 32 moves upward to the left, the facing area S1 between the movable polar plate 32 and the first fixed polar plate 311 increases, that is, the first capacitance value C1 increases; the facing area S2 between the movable plate 32 and the second fixed plate 312 may be increased or decreased, i.e., the second capacitance C2 may be increased or decreased; the facing area S3 between the movable polar plate 32 and the third fixed polar plate 313 may be increased or decreased, that is, the third capacitance C3 may be increased or decreased; the facing area S4 between the movable polar plate 32 and the fourth fixed polar plate 314 is reduced, that is, the fourth capacitance C4 is reduced, and the variation amounts of the first capacitance C1, the second capacitance C2, the third capacitance C3, and the fourth capacitance C4 are different.

(6) When the movable polar plate 32 moves downward and leftward, the facing area S1 between the movable polar plate 32 and the first fixed polar plate 311 may be increased or decreased, that is, the first capacitance C1 may be increased or decreased; the facing area S2 between the movable polar plate 32 and the second fixed polar plate 312 is increased, that is, the second capacitance C2 is increased; the facing area S3 between the movable polar plate 32 and the third fixed polar plate 313 is decreased, that is, the third capacitance C3 is decreased; the facing area S4 between the movable plate 32 and the fourth fixed plate 314 may be increased or decreased, that is, the fourth capacitance C4 may be increased or decreased, and the variation amounts of the first capacitance C1, the second capacitance C2, the third capacitance C3 and the fourth capacitance C4 are different.

(7) When the movable polar plate 32 moves upward to the right, the facing area S1 between the movable polar plate 32 and the first fixed polar plate 311 may be increased or decreased, that is, the first capacitance C1 may be increased or decreased; the facing area S2 between the movable polar plate 32 and the second fixed polar plate 312 is decreased, that is, the second capacitance C2 is decreased; the facing area S3 between the movable polar plate 32 and the third fixed polar plate 313 is increased, that is, the third capacitance C3 is increased; the facing area S4 between the movable plate 32 and the fourth fixed plate 314 may be increased or decreased, that is, the fourth capacitance C4 may be increased or decreased, and the variation amounts of the first capacitance C1, the second capacitance C2, the third capacitance C3 and the fourth capacitance C4 are different.

(8) When the movable polar plate 32 moves downward and rightward, the facing area S1 between the movable polar plate 32 and the first fixed polar plate 311 decreases, that is, the first capacitance C1 decreases; the facing area S2 between the movable plate 32 and the second fixed plate 312 may be increased or decreased, i.e., the second capacitance C2 may be increased or decreased; the facing area S3 between the movable polar plate 32 and the third fixed polar plate 313 may be increased or decreased, that is, the third capacitance C3 may be increased or decreased; the dead-against area S4 between the movable polar plate 32 and the fourth fixed polar plate 314 is increased, that is, the fourth capacitance C4 is increased, and the variation amounts of the first capacitance C1, the second capacitance C2, the third capacitance C3, and the fourth capacitance C4 are different.

It can be easily found from the above eight motion conditions that the capacitance value change corresponding to each motion is different, so the circuit board can indirectly obtain the motion of the carrier 22 in the shake compensation plane according to the capacitance value change of the four capacitance sensors. A unique moving direction can be determined according to the variation, for example, the first capacitance C1 becomes larger, the second capacitance C2 becomes larger, the third capacitance C3 becomes smaller, and the fourth capacitance C4 becomes smaller, and when the variation amplitudes of the four are the same, the carrier 22 moves to the right; in the case where the magnitude of the change is different, the carrier 22 is moved downward and rightward.

Further, it can be derived from the capacitance calculation formula that, assuming that, at the initial position, C1= C2= C3= C4= C0= ∈ XY/4 π kd, when the moving plate 32 moves in the left-right direction, C1= ∈ (X + Δ X) Y/4 π kd, C2= ∈ (X + Δ X) Y/4 π kd, C3= ∈ (X- Δ X) Y/4 π kd, C4= ∈ (X- Δ X) Y/4 π kd, Δ C = C1+ C2-C3-C4, and further Δ C/C0=4 Δ X/X is derived, where C0, X, Y correspond to data of the initial position, Δ C can be calculated from C1, C2, C3, and C4 of the capacitance sensor, and a specific displacement value Δ X in the left-right direction can be derived from Δ C. Similarly, when the movable pole plate 32 moves in the up-down direction, Δ C/C0=4 Δ Y/Y, the specific displacement value Δ Y in the up-down direction can be calculated according to Δ C. The movable electrode plate 32 moves in the up-down direction while moving in the left-right direction, and the actual displacement can be obtained by combining the foregoing processes of measuring Δ X and Δ Y, which are not described herein again.

The above embodiment is directed to the case that the four fixed pole plates 31 are equal in size and aligned in the center, in addition, in some other embodiments, the four fixed pole plates 31 may have different sizes or misaligned in the center, and the determination of the moving direction of the carrier 22 is similar to the above case, that is, the determination is performed by increasing or decreasing and changing the amplitudes of C1, C2, C3, and C4, and the specific determination logic is preset in the circuit board according to the actual size and position of the pole plates, which is not described in detail herein.

By using the above technical scheme, the change conditions of the capacitance values of the four capacitance sensors are calculated, so that the displacement of the carrier 22 in the shake compensation plane can be detected in real time; meanwhile, the change condition of the sum of the capacitance values of the four capacitance sensors is calculated, the displacement of the carrier 22 in the focusing direction can be detected in real time, and by using the technical scheme, the movement displacement of the carrier 22 in the focusing direction and the three directions in the shake compensation plane can be detected in real time only by matching five polar plates, so that the internal space of the actuator can be effectively saved, and the production cost can be reduced.

Referring to fig. 1-2, in an embodiment of the present disclosure, the carrier 22 may be configured to move in a first direction and a second direction perpendicular to each other, i.e., corresponding to the directions of arrow X and arrow Y, respectively, within the shake compensation plane, wherein the four fixed plates 31 may be arrayed in alignment in the first direction and the second direction. The regular matrix arrangement can simplify the circuit board calculation system and avoid unnecessary calculation program by making the movement direction consistent with the arrangement direction.

In order to facilitate the calculation of the displacement data of the carrier 22 by the circuit board, referring to fig. 5-6, in the embodiment of the present disclosure, the movable plate 32 may be configured as a rectangle, the outer contours of the four fixed plates 31 may respectively include first right angles 301 formed by two perpendicular right-angle sides, and the projections of the movable plate 32 in the jitter compensation plane are respectively staggered with the projections of the four first right angles 301 in the jitter compensation plane. Due to the design, the overlapped areas of the movable polar plate 32 and the four fixed polar plates 31 are all rectangular, and the processing and calculation of the circuit board are facilitated.

The present disclosure is not limited to the shape of the stationary plate 31, for example, referring to fig. 5, in some embodiments, four stationary plates 31 may each be rectangular. Further, referring to fig. 6, in other embodiments, the four stator plates 31 may each be a sector including two right-angled sides.

In order to reduce the purchasing difficulty and the process difficulty, and to simultaneously mass-produce the four fixed pole plates 31 and the movable pole plate 32, referring to fig. 5, in the embodiment of the present disclosure, the four fixed pole plates 31 and the movable pole plate 32 are configured to be square with the same size. The four fixed pole plates 31 and the four movable pole plates 32 do not need to be separately produced during production, the difference of the pole plates does not need to be distinguished during purchasing or assembling, and the universality is high.

In order to realize the movement of the optical actuator in the focusing direction and in the shake compensation plane, referring to fig. 1-2, in an embodiment of the present disclosure, the optical actuator may further include a frame 21, the carrier 22 may be configured to move in the focusing direction relative to the frame 21 and configured to move in the shake compensation plane relative to the fixing unit 10 following the frame 21, wherein an elastically deformable spring wire 63 may be connected between the carrier 22 and the frame 21 for supporting the carrier 22 and restoring the carrier 22, wherein a first spring plate 61 may be fixed on the carrier 22, a second spring plate 62 may be fixed on the frame 21, and both ends of the spring wire 63 are respectively connected with the first spring plate 61 and the second spring plate 62.

In an embodiment of the present disclosure, the spring wire 63 may be integrally formed with the first spring leaf 61 and the second spring leaf 62. In addition, in other embodiments, the spring wire 63 can be connected to the first spring plate 61 and the second spring plate 62 by welding. In an embodiment of the present disclosure, the first spring sheet 61 and the second spring sheet 62 may be welded to the frame 21 and the carrier 22 corresponding thereto. In addition, in other embodiments, the first spring plate 61 and the second spring plate 62 can be fixed on the frame 21 and the carrier 22 corresponding to the first spring plate by means of adhesion or mechanical connection.

According to some embodiments, the number of the first spring plate 61 and the second spring plate 62 can be multiple, and the number of the first spring plate and the second spring plate is distributed on the corresponding frame 21 or carrier 22 at intervals, so that the support and the reset are more stable. Furthermore, according to other embodiments, the number of the first spring plate 61 and the second spring plate 62 can be one, and in order to ensure the stability of the support and the return, the size of the first spring plate 61 and the second spring plate 62 can be increased, that is, the contact area between the first spring plate and the corresponding frame 21 or the corresponding carrier 22 can be increased.

In order to electrically connect the movable plate 32 and the adaptor 40, referring to fig. 1-4, in an embodiment of the present disclosure, the optical actuator may further include a first connecting arm 71 electrically connected between the movable plate 32 and the first spring plate 61, and a second connecting arm 72 electrically connected between the second spring plate 62 and the adaptor 40. When the movable pole plate 32 is used, the movable pole plate is electrically connected with the adaptor 40 sequentially through the first connecting arm 71, the first spring leaf 61, the spring wire 63, the second spring leaf 62 and the second connecting arm 72.

The connection mode of the first connecting arm 71 with the movable pole plate 32 and the first spring 61 is not limited in the present disclosure, and it may be that one end is integrally formed with the movable pole plate 32, and the other end is welded with the first spring 61, or both ends are welded with the movable pole plate 32 and the first spring 61. Similarly, in some embodiments, second attachment arm 72 can be integrally formed with second leaf 62, and in other embodiments, second attachment arm 72 can be welded to second leaf 62.

Referring to fig. 1 to 4, in an embodiment of the present disclosure, the unit cell 10 may include a main body 11 and a plurality of posts 12 formed at positions near edges of the main body 11, the adaptor 40 for electrically connecting the movable plate 32 extends from the main body 11 to the posts 12, the posts 12 are formed with terminals 121 electrically connected to the adaptor 40, and the second connection arms 72 electrically connect the terminals 121. In other embodiments, the second connecting arm 72 may be directly electrically connected to the adaptor 40, which is not limited by the present disclosure.

In order to electrically connect the four fixed pole plates 31 to their corresponding adaptors 40, respectively, referring to fig. 1 to 4, in an embodiment of the present disclosure, the optical actuator may further include four third connection arms 73 electrically connected between the fixed pole plates 31 and the adaptors 40, respectively.

In the embodiment of the present disclosure, the third connecting arm 73 may be integrally formed with the fixed pole plate 31 corresponding thereto, and in some other embodiments, the third connecting arm 73 may also be welded to the fixed pole plate 31 corresponding thereto. It should be noted that the first connecting arm 71, the second connecting arm 72, and the third connecting arm 73 are not limited in the present disclosure, as long as they can perform an electric conduction function, and they may be copper wires, iron wires, and the like.

Referring to fig. 2, in an embodiment of the present disclosure, a plurality of balls 50 for supporting relative movement may be disposed between the unit cell 10 and the frame 21. By such a design, the relative movement between the frame 21 and the unit 10 can be converted from sliding to rolling, the friction is reduced and the supporting strength of the balls 50 is high.

In order to avoid the play of the balls 50, in other embodiments, a ball groove for limiting the play of the balls 50 may be further provided. In addition, the number of the balls 50 is not limited in the present disclosure, and may be adaptively designed according to the support requirement.

In order to avoid interference when the movable pole plate 32 and the fixed pole plate 31 are installed with the balls 50, referring to fig. 1 to 2, in an embodiment of the present disclosure, the unit cell 10 and the frame 21 may be configured in a square shape, wherein a plurality of balls 50 are distributed at positions of the unit cell 10 and the frame 21 near three corners, and four fixed pole plates 31 and movable pole plates 32 are respectively disposed at positions near the other corners.

Referring to fig. 1-2, in an embodiment of the present disclosure, the optical actuator may further include: an AF coil 81 surrounding the circumference of the carrier 22, a power magnet 82 fixed to the frame 21, and an OIS coil 83 fixed to the stationary unit 10, wherein the power magnet 82 is configured to generate a focusing driving force and a shake compensation driving force in cooperation with the AF coil 81 and the OIS coil 83, respectively. With this arrangement, it is not necessary to separately provide magnets for the AF coil 81 and the OIS coil 83, respectively, and the size and weight of the optical actuator can be reduced.

According to a second aspect of the present disclosure, referring to fig. 7, a camera module is provided, which includes an optical device 90 and the optical actuator, and since the camera module has all the advantages of the optical actuator, the description is omitted here.

It should be noted that the present disclosure does not specifically limit the optical device 90, and in some embodiments, the optical device 90 may be a lens. Furthermore, in other embodiments, the optical device 90 may be a light sensing chip.

According to a third aspect of the present disclosure, referring to fig. 8, a mobile terminal is provided, which includes the above-mentioned camera module, and since the mobile terminal has all the advantages of the above-mentioned camera module, the details are not repeated herein.

The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.

It should be noted that, in the above embodiments, the various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various possible combinations will not be further described in the present disclosure.

In addition, any combination of various embodiments of the present disclosure may be made, and the same should be considered as the disclosure of the present disclosure, as long as it does not depart from the spirit of the present disclosure.

Claims

1. An optical actuator comprising a stator unit and a carrier for mounting an optical device, movable relative to the stator unit in a shake compensation plane and in a focus direction, characterized in that:

one of the fixed unit and the carrier is provided with four fixed polar plates which are respectively parallel to the jitter compensation plane, the projections of the four fixed polar plates in the jitter compensation plane are distributed in a 2 x 2 rectangular array, and the other fixed polar plate is provided with a movable polar plate which is parallel to the four fixed polar plates at intervals;

the optical actuator further comprises a plurality of conductive adapters arranged on the fixed unit and used for being connected to a circuit board, and the four fixed pole plates and the four movable pole plates are respectively and electrically connected with the corresponding adapters so that the four fixed pole plates and the four movable pole plates form capacitance sensors respectively;

when the carrier moves, the projections of the movable polar plate in the jitter compensation plane are respectively staggered with the projections of the four fixed polar plates in the jitter compensation plane, and the sum of the staggered areas is unchanged.

2. An optical actuator according to claim 1, wherein four of the stator plates are coplanar.

3. An optical actuator according to claim 1, wherein the carrier is configured to move in mutually perpendicular first and second directions, respectively, in a jitter compensation plane,

wherein the four fixed polar plates are arranged in an array aligned in the first direction and the second direction.

4. An optical actuator according to any one of claims 1-3, wherein the movable plate is rectangular, the outer contours of the four fixed plates respectively include first right angles formed by two perpendicular right-angled sides, and the projections of the movable plate in the jitter compensation plane are respectively interleaved with the projections of the four first right angles in the jitter compensation plane.

5. An optical actuator according to claim 4, wherein the four fixed and movable plates are configured as squares of equal size.

6. An optical actuator according to claim 1, further comprising a frame, wherein the carrier is configured to move in the focus direction relative to the frame and to follow the movement of the frame relative to the stator in the shake compensation plane, wherein an elastically deformable spring wire is connected between the carrier and the frame for supporting the carrier,

the carrier is fixed with a first reed, the frame is fixed with a second reed, and two ends of the spring wire are respectively connected with the first reed and the second reed.

7. An optical actuator according to claim 6, wherein the fixed plate is disposed on the fixed unit and the movable plate is disposed on the carrier, the optical actuator further comprising a first connecting arm electrically connected between the movable plate and the first reed, and a second connecting arm electrically connected between the second reed and the adaptor.

8. An optical actuator according to claim 7, wherein the fixed unit includes a main body and a plurality of posts formed at positions near an edge of the main body, an adaptor for electrically connecting the movable plate extends from the main body to the posts, the posts are formed with terminals to which the adaptor is electrically connected, and the second connecting arm is electrically connected to the terminals.

9. An optical actuator according to claim 8, further comprising four third connecting arms electrically connected between the stationary plate and the interposer, respectively.

10. An optical actuator according to claim 6, wherein a plurality of balls are provided between the stator unit and the frame for supporting relative movement.

11. The optical actuator of claim 10, wherein the stator unit and the frame are configured in a square shape, wherein a plurality of balls are distributed at positions near three corners of the stator unit and the frame, and four of the stator plate and the movable plate are respectively disposed at positions near the other corners.

12. An optical actuator according to claim 6, further comprising: the focusing and shaking compensating device comprises an AF coil surrounding the circumference of the carrier, a power magnet fixed on the frame and an OIS coil fixed on the fixed unit, wherein the power magnet is used for generating focusing driving force and shaking compensating driving force respectively in cooperation with the AF coil and the OIS coil.

13. A camera module comprising an optical device and an optical actuator according to any one of claims 1 to 12.

14. A mobile terminal characterized by comprising the camera module of claim 13.