Camera module, camera actuator, and control method thereof

Abstract

A camera module according to an embodiment disclosed herein comprises: a first camera actuator; a second camera actuator disposed in a first direction from the first camera actuator; a circuit board including an image sensor disposed at the rear end of the second camera actuator; and a third camera actuator disposed at the upper end of the first camera actuator or the second camera actuator. The third camera actuator includes a magnification lens, and the magnification lens moves in the first direction from the upper end of the first camera actuator or the second camera actuator.

Description

Camera module, camera actuator and control method thereof

[0001] The embodiment relates to a camera module, a camera actuator and a method for controlling the same.

[0002] A camera is a device that captures images or videos of a subject, and is installed in portable devices, drones, vehicles, etc. Camera modules may have an image stabilization (IS) function that compensates for or prevents image shaking caused by the user's movements to improve image quality, an auto focusing (AF) function that automatically adjusts the distance between the image sensor and the lens to align the focal length of the lens, and a zooming function that increases or decreases the magnification of a distant subject and captures it using a zoom lens.

[0003] Conventional camera modules consist of multiple lens groups and prisms. The position of the lenses along the optical axis is adjusted to control the field of view (FoV), thereby altering magnification. This lens positioning is controlled by an actuator. However, this approach suffers from the limitation of the magnification range that can be adjusted due to the size constraints of the camera module.

[0004] As smartphone usage increases, the demand for diverse camera features increases. This trend requires not only price competitiveness but also high performance. Camera modules that implement AF / zoom functions are used. As camera module specifications become increasingly higher, performance limitations arise with existing technologies.

[0005] The actuator of a conventional camera module controls the movement of the lens assembly and senses the position using PID (Proportional-Integration-Differential) control. At this time, if the target position of the lens assembly differs from the sensed position, the error is calculated and corrected. However, in the conventional camera actuator, the current control value according to the calculated error is larger than the current limit that the actual camera actuator can operate, and when the actuator saturates, the error integral value accumulates to a large value. As a result, there is a problem that a deviation occurs between the target position and the actual operating position.

[0006] The embodiment provides a camera module capable of extending the magnification range.

[0007] Additionally, a camera module is provided that can increase the magnification range without increasing the size of the module.

[0008] The embodiment provides a camera actuator and a control method thereof that improve the driving error of a lens assembly.

[0009] Additionally, a camera actuator with improved defect occurrence is provided.

[0010] The problem to be solved in the embodiment is not limited to this, and it can be said that the purpose or effect that can be understood from the solution or embodiment of the problem described below is also included.

[0011] A camera module according to an embodiment comprises: a first camera actuator; a second camera actuator disposed in a first direction from the first camera actuator; a circuit board including an image sensor disposed at a rear end of the second camera actuator; and a third camera actuator disposed on top of the first camera actuator or the second camera actuator, wherein the third camera actuator includes a magnification lens, and the magnification lens is movable in the first direction from the top of the first camera actuator or the second camera actuator.

[0012] The first camera actuator includes a prism, and the magnifying lens overlaps the prism in a second direction, the second direction being an incident direction of light and being a direction perpendicular to the first direction.

[0013] The above magnifying lens is arranged perpendicular to the second direction and can pass the light through the prism.

[0014] The third camera actuator includes a lens assembly that moves in the first direction, and the lens assembly can be coupled with the magnification lens.

[0015] The above lens assembly includes a fixing member that surrounds the magnification lens, and the fixing member can be arranged perpendicular to the second direction.

[0016] The first direction width of the third camera actuator may be greater than the first direction width of the first camera actuator and may be less than the sum of the first direction widths of the first camera actuator and the second camera actuator.

[0017] The first direction width of the third camera actuator may be greater than twice the first direction width of the magnification lens.

[0018] The first direction movement distance of the lens assembly may be greater than the first direction width of the magnification lens.

[0019] The third camera actuator may include a first region overlapping the first camera actuator in the second direction and a second region overlapping the second camera actuator in the second direction.

[0020] The first direction width of the first region may be smaller than the first direction width of the second region.

[0021] The second direction width of the third camera actuator may be smaller than the second direction widths of the first camera actuator and the second camera actuator.

[0022] The third camera actuator includes a driving magnet disposed on the lens assembly, the driving magnet not overlapping with the magnification lens in a third direction, and the third direction may be a direction perpendicular to the first direction and the second direction.

[0023] The third camera actuator includes a first opening through which the light is incident, and the first opening can overlap the prism in the second direction.

[0024] The magnification lens does not overlap with the first camera actuator in a second direction, and overlaps with the second camera actuator in the second direction, the second direction being the incident direction of light and being a direction perpendicular to the first direction.

[0025] A camera actuator according to an embodiment includes a housing; a lens assembly that moves along an optical axis direction within the housing; a driving unit that moves the lens assembly; a sensor unit that detects a position of the lens assembly; and a monitoring unit that measures a current of the driving unit; wherein the driving unit includes a control unit and a tuner, and the tuner can initialize a control gain of the control unit when the monitoring unit determines that the current of the driving unit exceeds a reference value.

[0026] The above driving unit may include a comparison unit that compares the position of the lens assembly detected by the sensor unit with the target position and calculates an error value.

[0027] The above control unit can generate a control signal by applying the control gain corresponding to the error value.

[0028] The above driving unit may include a driving circuit that generates a driving signal to move the lens assembly according to the control signal.

[0029] The above control gain may be a gain value according to PID (Proportional-Integration-Differential) control.

[0030] The above control gain may include a first control gain to a third control gain.

[0031] The above tuner can simultaneously set the first control gain to the third control gain to 0 when the monitoring unit determines that the current of the driving unit exceeds a reference value.

[0032] The above tuner can be returned to its original state after a certain recovery time after initializing the first control gain to the third control gain.

[0033] The recovery times of the first control gain to the third control gain may be different from each other.

[0034] The recovery time of the first control gain may be shorter than the recovery time of the second control gain, and the recovery time of the second control gain may be shorter than the recovery time of the third control gain.

[0035] The first control gain may be a proportional control gain, the second control gain may be an integral control gain, and the third control gain may be a differential control gain.

[0036] A camera actuator control method according to an embodiment may include a step of a monitoring unit measuring a current flowing to a driving unit; a step of the monitoring unit determining whether the current flowing to the driving unit exceeds a reference value; and a step of a tuner initializing a control gain of the control unit to 0 when the current flowing to the driving unit exceeds the reference value.

[0037] A camera actuator control method according to an embodiment may include a step in which the tuner returns the control gain to its original state.

[0038] A method for controlling a camera actuator according to an embodiment may include a step in which a sensor unit detects a position of a lens assembly.

[0039] A camera actuator control method according to an embodiment may include a step in which a comparison unit compares a position of a lens assembly detected by the sensor unit with a target position and calculates an error value.

[0040] A camera actuator control method according to an embodiment may include a step in which a control unit generates a control signal by applying the control gain corresponding to the error value.

[0041] A camera actuator control method according to an embodiment may include a step of generating a driving signal for a driving unit to move a lens assembly according to the control signal.

[0042] According to an embodiment, a camera module capable of expanding the magnification range can be provided.

[0043] Additionally, a camera module can be provided that can increase the magnification range without increasing the size of the module.

[0044] According to an embodiment, a camera actuator with improved driving error and a control method thereof can be provided.

[0045] Additionally, a camera actuator with improved defect occurrence can be provided.

[0046] The various advantageous and beneficial effects of the present invention are not limited to the above-described contents, and will be more easily understood in the course of explaining specific embodiments of the present invention.

[0047] Fig. 1 is a perspective view of a camera module according to an embodiment;

[0048] Fig. 2 is an exploded perspective view of a camera module according to an embodiment;

[0049] Figure 3 is a cross-sectional view taken along line AA in Figure 1,

[0050] Fig. 4 is a cross-sectional view of the lens assembly according to the embodiment in Fig. 3, in which the lens assembly is moved.

[0051] Figure 5 is a perspective view of a third camera actuator according to an embodiment;

[0052] Figure 6 is a cross-sectional view taken along line BB in Figure 5,

[0053] Fig. 7 is a perspective view of a lens assembly according to an embodiment;

[0054] Fig. 8 is a side view of a lens assembly according to an embodiment;

[0055] Fig. 9 is a top view of a lens assembly according to an embodiment;

[0056] Fig. 10 is a perspective view of a body according to an embodiment;

[0057] Fig. 11 is a perspective view of a shield can according to an embodiment;

[0058] Fig. 12 is a perspective view of a circuit board according to an embodiment;

[0059] Fig. 13 is a perspective view of a camera module according to an embodiment;

[0060] Fig. 14 is an exploded perspective view of a camera module according to an embodiment;

[0061] Fig. 15 is a cross-sectional view taken along line AA' in Fig. 13,

[0062] Fig. 16 is a configuration diagram of a camera actuator according to an embodiment;

[0063] Fig. 17 is a configuration diagram of a driving unit according to an embodiment;

[0064] Fig. 18 is a flowchart explaining the operating principle of a camera actuator according to an embodiment.

[0065] Figure 19 is a graph showing the change in state over time of a camera actuator according to an embodiment.

[0066] Fig. 20 is a flowchart of a method for controlling a camera actuator according to an embodiment.

[0067] Figure 21 is a graph showing the state change over time of a conventional camera actuator.

[0068] Fig. 22 is a graph showing the change in state over time of a camera actuator according to an embodiment.

[0069] Fig. 23 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied.

[0070] Fig. 24 is a perspective view of a vehicle to which a camera module according to an embodiment is applied.

[0071] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0072] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0073] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0074] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0075] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0076] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

[0077] These terms are intended only to distinguish one component from another, and are not intended to limit the nature, order, or sequence of the component.

[0078] And, when a component is described as being 'connected', 'coupled' or 'connected' to another component, it may include not only cases where the component is directly connected, coupled or connected to the other component, but also cases where the component is 'connected', 'coupled' or 'connected' by another component between the component and the other component.

[0079] Additionally, when described as being formed or arranged "above or below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below", it can include the meaning of a downward direction as well as an upward direction based on one component.

[0080] Fig. 1 is a perspective view of a camera module according to an embodiment, and Fig. 2 is an exploded perspective view of a camera module according to an embodiment.

[0081] Referring to FIGS. 1 and 2, a camera module (1000) according to an embodiment may be composed of a first camera actuator (1100), a second camera actuator (1200), a third camera actuator (1300), a body (1400), a shield can (1500), and a circuit board (1600).

[0082] Here, the first camera actuator (1100) may be used interchangeably as the first actuator, the second camera actuator (1200) may be used interchangeably as the second actuator, and the third camera actuator (1300) may be used interchangeably as the third actuator. The camera module (1000) according to the embodiment may include the first camera actuator (1100).

[0083] The first camera actuator (1100) may be an OIS (Optical Image Stabilizer) actuator. For example, the first camera actuator (1100) may move an optical element in a direction perpendicular to the optical axis (axis of incident light).

[0084] The first camera actuator (1100) may include a fixed focal length lens arranged in a predetermined barrel (not shown). The fixed focal length lens may also be referred to as a “single focal length lens” or “single lens.”

[0085] The first camera actuator (1100) can change the path of light. In an embodiment, the first camera actuator (1100) can change the path of light vertically through an internal optical member (e.g., a prism or a mirror). For example, the optical member can change the light from the X-axis direction to the Z-axis direction. Or, the optical member can change the light from the first axis to the second axis. By this configuration, even if the thickness of the mobile terminal is reduced, a lens configuration larger than the thickness of the mobile terminal can be placed inside the mobile terminal through the change of the light path, thereby performing magnification, auto-focusing (AF), zoom, and OIS functions.

[0086] However, it is not limited thereto, and the first camera actuator (1100) can change the optical path vertically or at a predetermined angle multiple times.

[0087] The first camera actuator (1100) may include a housing, a back cover epoxy, a housing epoxy, and an FPCB. The first camera actuator (1100) may include a prism (1110).

[0088] A camera module (1000) according to an embodiment may include a second camera actuator (1200) positioned at the rear end of a first camera actuator (1100).

[0089] The second camera actuator (1200) may be positioned behind the first camera actuator (1100). The second camera actuator (1200) may be coupled to the first camera actuator (1100). The coupling between the two may be achieved in various ways.

[0090] Additionally, the second camera actuator (1200) may be a zoom actuator or an auto focus (AF) actuator. For example, the second camera actuator (1200) may support one or more lenses and move the lenses according to a control signal from a predetermined control unit to perform an auto focus function or a zoom function.

[0091] The second camera actuator (1200) may include a PCB, a main barrel, a barrel cover, a front cover tape, a top cover tape, and a rear cover tape.

[0092] A lens assembly may be placed between the first camera actuator (1100) and the second camera actuator (1200).

[0093] Light can be incident into the first camera actuator (1100) through an opening area located on the upper surface of the first camera actuator (1100). That is, the light is first incident into the interior of the first camera actuator (1100) along a second direction (e.g., X-axis direction, based on incident light), and the light path can be changed to the first direction (e.g., Z-axis direction) through an optical member. Then, the light can pass through the second camera actuator (1200) and be incident on an image sensor (IS) located at one end of the second camera actuator (1200) (PATH).

[0094] The camera module (1000) according to the embodiment may include a third camera actuator (1300) positioned on top of the first camera actuator (1100).

[0095] The third camera actuator (1300) may be positioned on top of the first camera actuator (1100). The third camera actuator (1300) may be an actuator that drives a magnification lens. For example, the third camera actuator (1300) may support the magnification lens and may perform a function of adjusting the magnification of the camera module by moving the lens according to a control signal from a predetermined control unit. The third camera actuator (1300) may allow light to pass through and enter the first camera actuator. The third camera actuator (1300) may include an opening for admitting light and an opening for emitting light.

[0096] The third camera actuator (1300) may include a main barrel, a barrel cover, a front cover tape, a top cover tape, and a rear cover tape.

[0097] The circuit board (1600) may be placed behind the second camera actuator (1200). The circuit board (1500) may be electrically connected to the second camera actuator (1200) and the first camera actuator (1100). In addition, there may be a plurality of circuit boards (1300).

[0098] The first camera actuator (1100), the second camera actuator (1200), and the circuit board (1600) can be sequentially arranged along the first direction.

[0099] A camera module according to an embodiment may be comprised of a single or multiple camera modules. For example, the multiple camera modules may include a first camera module and a second camera module. Furthermore, the term "camera module" may be used interchangeably with terms such as "sensor device," "camera device," "camera module," "camera device," "imaging device," "imaging module," and "imaging device."

[0100] And the first camera module may include a single or multiple actuators. For example, the first camera module may include a first camera actuator (1100), a second camera actuator (1200), and a third camera actuator (1300).

[0101] And the second camera module may be placed in a predetermined housing (not shown) and may include an actuator (not shown) capable of driving a lens unit. The actuator may be a voice coil motor, a micro actuator, a silicon actuator, etc., and may be applied in various ways such as an electrostatic method, a thermal method, a bimorph method, an electrostatic force method, etc., but is not limited thereto. In addition, the camera actuator in this specification may be referred to as an actuator, etc. In addition, a camera module composed of a plurality of camera modules may be mounted in various electronic devices such as a mobile terminal. Furthermore, the actuator may be a device that moves or tilts a lens or an optical member. However, below, the actuator is described as a concept including a lens or an optical member. Furthermore, the actuator may be called a 'lens transport device', 'lens transport device', 'optical member transport device', 'optical member moving device', etc.

[0102] In this specification, the bottom means one side in the second direction. And the second direction is the X-axis direction in the drawing and can be used interchangeably with the first-axis direction, etc. The third direction is the Y-axis direction in the drawing and can be used interchangeably with the second-axis direction, etc. The first direction is a direction perpendicular to the second direction. In addition, the first direction is the Z-axis direction in the drawing and can be used interchangeably with the third-axis direction, etc. The first direction is a direction perpendicular to both the second direction and the third direction. The first direction may be a direction in which incident light is refracted. Here, the second direction (X-axis direction) corresponds to the direction of the optical axis of incident light, and the first direction (Z-axis direction) and the third direction (Y-axis direction) are directions perpendicular to the optical axis. In addition, the second direction may be the incident direction of light. In addition, in the description of the camera module (1000) below, the first direction corresponds to the optical path and is described below based on this.

[0103] FIG. 3 is a cross-sectional view taken along line AA in FIG. 1, FIG. 4 is a cross-sectional view of a lens assembly according to an embodiment moved in FIG. 3, FIG. 5 is a perspective view of a third camera actuator according to an embodiment, FIG. 6 is a cross-sectional view taken along line BB in FIG. 5, FIG. 7 is a perspective view of a lens assembly according to an embodiment, FIG. 8 is a side view of a lens assembly according to an embodiment, and FIG. 9 is a top view of a lens assembly according to an embodiment.

[0104] Referring to FIGS. 3 to 6, the camera module (1000) according to the embodiment may include a third camera actuator (1300).

[0105] The third camera actuator (1300) may include a magnification lens (1310). The third camera actuator (1300) may be an actuator that drives the magnification lens (1310). The third camera actuator (1300) may move the magnification lens (1310) in a first direction. The third camera actuator (1300) may move the magnification lens (1310) laterally. The magnification lens (1310) may be arranged such that a lens surface faces the incident direction of light (the second direction). The camera actuator (1300) may move the magnification lens (1310) in a direction perpendicular to the direction in which the lens surface of the magnification lens (1310) faces. The third camera actuator (1300) can move the magnification lens (1310) in a direction perpendicular to the direction of incidence of light. The third camera actuator (1300) can move the magnification lens (1310) in a first direction to allow the incident light to pass through the magnification lens (1310). The magnification lens (1310) can be fixed to the lens assembly (1320). The magnification lens (1310) can be fixed to the fixing part (1321) of the lens assembly (1320). The camera module (1000) can increase the magnification range by including the third camera actuator (1300) to move the magnification lens (1310) in the first direction. The magnification lens (1310) can include a telephoto conversion lens.

[0106] The magnification lens (1310) may or may not overlap with the prism (1110) of the first camera actuator (1100) in the second direction depending on the operation of the third camera actuator (1300). The magnification lens (1310) may or may not overlap with the prism (1110) in the second direction depending on the movement of the lens assembly (1320) of the third camera actuator (1300). When the magnification lens (1310) is arranged to overlap with the prism (1110) in the second direction, the magnification range of the camera module (1000) may be expanded. For example, the magnification lens (1310) may be capable of expanding the magnification up to 4 times. In this case, if the magnification lens (1310) is positioned so as not to overlap with the prism (1110) in the second direction, and the magnification range of the camera module (1000) is 4 to 8 times, the magnification range of the camera module (1000) can be expanded to 16 to 32 times if the magnification lens (1310) is positioned so as to overlap with the prism (1110) in the second direction. Consequently, when the third camera actuator (1300) according to the embodiment is included, not only the magnification range of the existing camera module (1000) but also an expanded magnification range can be implemented simultaneously.

[0107] The third camera actuator (1300) may include a lens assembly (1320). The lens assembly (1320) may be disposed inside the third camera actuator (1300) to move the magnification lens (1310). The lens assembly (1320) may be movable in a first direction. The lens assembly (1320) may include a fixing member (1321). The fixing member (1321) may contact the magnification lens (1310) to fix the magnification lens (1310) to the lens assembly (1320). The fixing member (1321) may be disposed to surround the periphery of the magnification lens (1310). The length of the periphery of the fixing member (1321) may be longer than the length of the periphery of the magnification lens (1310). The fixed portion (1321) may protrude in a first direction on one surface of the lens assembly (1320). The second direction width of the lens assembly (1320) of the third camera actuator (1300) may be smaller than the second direction width of the lens assembly (1210) of the second camera actuator (1200). The first direction movement distance of the lens assembly (1320) of the third camera actuator (1300) may be greater than the diameter of the magnification lens (1310). The lens assembly (1320) may include a body portion (1322). The body portion (1322) may be a portion that supports the lens assembly (1320) so that the lens assembly can move in the first direction within the third camera actuator (1300). The body portion (1322) may be connected to the fixed portion (1321). A driving magnet (1341) may be fixed to the body portion (1322). The body portion (1322) may include a groove that contacts the ball (1360). The body portion (1322) may overlap the coil (1342) in a third direction.

[0108] The third camera actuator (1300) may be arranged at the upper end of the camera module (1000). The third camera actuator (1300) may be arranged in a direction in which light of the camera module (1000) is incident. The light may be incident on the camera module (1000) through the third camera actuator (1300). The third camera actuator (1300) may overlap the first camera actuator (1100) in a second direction. The third camera actuator (1300) may be arranged on the upper surface of the first camera actuator (1100). The third camera actuator (1300) may be arranged in a direction in which light is incident from the first camera actuator (1100). The third camera actuator (1300) may partially overlap with the second camera actuator (1200) in the second direction. The third camera actuator (1300) may not overlap with the image sensor in the first direction. The third camera actuator (1300) may not overlap with the prism (1110) in the first direction.

[0109] The third camera actuator (1300) may include a first opening (R1) through which light enters. The light may enter the interior of the third camera actuator (1300) through the first opening (R1). The third camera actuator (1300) may include a second opening (R2) through which light exits. The light may enter the first camera actuator (1100) through the second opening (R2). The light may sequentially pass through the first opening (R1), the magnification lens (1310), and the second opening (R2). The first opening (R1) and the second opening (R2) may overlap in the second direction. The first opening (R1) and the second opening (R2) may overlap with the opening of the first camera actuator (1100) in the second direction. In addition, the first opening (R1) and the second opening (R2) may overlap with the prism (1110) of the first camera actuator (1100) in the second direction. Light passing through the third camera actuator (1300) may be incident on the first camera actuator (1100). Light passing through the third camera actuator (1300) may be incident on the prism (1110) through the opening of the first camera actuator (1100).

[0110] The third camera actuator (1300) may include a housing (1330). The housing (1330) may surround the exterior of the third camera actuator (1300) and protect the magnification lens (1310) and the lens assembly (1320). The housing (1330) of the third camera actuator (1300) may contact the first camera actuator (1100) and the second camera actuator (1200). A first direction width of the housing (1300) of the third camera actuator (1300) may be smaller than the sum of the first direction widths of the first camera actuator (1100) and the second camera actuator (1200). The second direction width of the housing (1300) of the third camera actuator (1300) may be smaller than the second direction widths of the first camera actuator (1100) and the second camera actuator (1200). The housing (1330) may include a first opening (R1) and a second opening (R2).

[0111] The third camera actuator (1300) may include a driving unit (1340). The driving unit (1340) may move the lens assembly (1320) in a first direction. The driving unit (1340) may move the lens assembly (1320) in the first direction through electromagnetic force. The driving unit (1340) may include a driving magnet (1341) and a coil (1342). The driving magnet (1341) and the coil (1342) may move the lens assembly (1320) in the first direction. In addition, the coil (1342) may face the driving magnet (1341) in a third direction (y-axis direction) perpendicular to the first direction. In addition, the coil (1342) may generate an electromagnetic force with the facing driving magnet (1341) to move the lens assembly (1320).

[0112] The driving unit (1340) may include a driving magnet (1341). For example, the driving magnet (1341) may be positioned in the lens assembly (1320). These positions may also be reversed.

[0113] In an embodiment, the driving magnet (1341) may be disposed in the lens assembly (1320). The driving magnet (1341) may be fixed to the lens assembly (1320). The driving magnet (1341) may be adhesively bonded to the lens assembly (1320). The driving magnet (1341) may be disposed within the housing (1330). The driving magnet (1341) may be disposed between the coil (1342) and the lens assembly (1320). The driving magnet (1341) may be disposed on the inside of the coil (1342). The driving magnet (1341) may not overlap with the magnification lens (1310) in a third direction.

[0114] The driving magnet (1341) may overlap the coil (1342) in a direction perpendicular to the optical axis. The driving magnet (1341) may be arranged to overlap the coil (1342) in a third direction (y-axis direction) perpendicular to the first direction. The driving magnet (1341) may face the coil (1342) in the y-axis direction perpendicular to the first direction. The driving magnet (1341) may be arranged to face the coil (1342). The driving magnet (1341) may be arranged to face the coil (1342) in the y-axis direction perpendicular to the first direction. The driving magnet (1341) may face the coil (1342). The driving magnet (1341) may face the coil (1342). The driving magnet (1341) can be positioned corresponding to the coil (1342). The driving magnet (1341) can interact with the coil (1342). The driving magnet (1341) can electromagnetically interact with the coil (1342). The driving magnet (1341) can move. The driving magnet (1341) can be positioned so as to be movable. For example, the coil (1342) can generate an electromagnetic force through an electromagnetic interaction with the driving magnet (1341). At this time, an electromagnetic force is applied to the coil (1342), but since the coil (1342) is fixed, the driving magnet (1341) of the lens assembly (1320) can move in the first direction. The driving magnet (1341) can move together with the lens assembly (1320). The driving magnet (1341) can move in the first direction. When current is applied to the coil (1342), the driving magnet (1341) can move in the first direction.

[0115] The driving unit (1340) may include a coil (1342). The coil (1342) may be disposed on the substrate (1350). The coil (1342) may be disposed on the inner surface of the substrate (1350). The coil (1342) may be disposed on the outer surface of the driving magnet (1341). The coil (1342) may be disposed between the substrate (1350) and the driving magnet (1341). The coil (1342) may be fixed. The coil (1342) may remain fixed even when the lens assembly (1320) is driven. The coil (1342) may interact with the driving magnet (1341). The coil (1342) may face the driving magnet (1341). The coil (1342) may face the driving magnet (1341). The coil (1342) may be positioned corresponding to the driving magnet (1341). The coil (1342) may overlap the driving magnet (1341) in a direction perpendicular to the optical axis. The coil (1342) may overlap the driving magnet (1341) in the y-axis direction perpendicular to the first direction. The coil (1342) may overlap the driving magnet (1341) in a third direction.

[0116] The third camera actuator (1300) may include a substrate (1350). The substrate (1350) may be disposed on a side of the housing (1330). A coil (1342) may be disposed on the substrate (1350). The substrate (1350) may overlap the lens assembly (1320) and the driving magnet (1341) in a third direction.

[0117] The third camera actuator (1300) may include a ball (not shown). The ball may guide the movement of the lens assembly (1320) in a first direction. The ball may be disposed between the lens assembly (1320) and the housing (1330). The ball may be disposed between the lens assembly (1320) and the housing (1330) in the y-axis direction. The ball may be disposed in a groove of the lens assembly (1320). The ball may be disposed in a groove of the housing (1330). The ball may overlap the driving net (1341) in a third direction. The ball may be spherical. The ball may be formed of metal. The ball may be formed non-magnetically. Grease may be applied to the surface of the ball.

[0118] The first direction width (a3) ​​of the third camera actuator (1300) may be greater than the first direction width (a1) of the first camera actuator (1100). The first direction width (a3) ​​of the third camera actuator (1300) may be smaller than the sum of the first direction width (a1) of the first camera actuator (1100) and the first direction width (a2) of the second camera actuator (1200). The second direction width (b3) of the third camera actuator (1300) may be smaller than the second direction widths (b1) of the first camera actuator (1100) and the second camera actuator (1200).

[0119] The third camera actuator (1300) may include a first area (A1) overlapping with the first camera actuator (1100) in a second direction and a second area (A2) overlapping with the second camera actuator (1200) in a second direction. A first direction width (w1) of the first area (A1) may be smaller than a first direction width (w2) of the second area (A2).

[0120] Fig. 10 is a perspective view of a body according to an embodiment.

[0121] Referring to FIGS. 1, 2 and 10, a camera module (1000) according to an embodiment may include a body (1400).

[0122] The body (1400) can surround the shield can (1500). The body (1400) can be placed on the outside of the camera module (1000). For example, the body (1400) can surround the first camera actuator (1100), the second camera actuator (1200), the third camera actuator (1300), the circuit board (1600), the shield can (1500), etc., which are located inside the camera module (1000). With this configuration, the body (1400) can absorb external impacts on the camera module (1000) or prevent foreign substances from entering. In other words, the body (1400) can improve the reliability of the camera module (1000).

[0123] Specifically, the body (1400) may be positioned on a side portion of the camera module (1000). Accordingly, the body (1400) may surround the side portions of the first camera actuator (1100), the second camera actuator (1200), the third camera actuator (1300), the circuit board (1600), and the shield can (1500).

[0124] For example, the body (1400) may surround the exterior of the shield can (1500). The body (1400) may be in contact with the shield can (1500). The body (1400) may include an Al bracket. With this configuration, the body (1400) may improve structural stability and perform effective heat dissipation.

[0125] The body (1400) may include a body groove (1410). The body groove (1410) may overlap with the image sensor in a first direction. In addition, the body groove (1410) may be located at the rear end of the circuit board (1600). Accordingly, the body groove (1410) may partially overlap with the circuit board (1600) in the first direction. In addition, the body groove (1410) may also partially overlap with the first camera actuator (1100) and the second camera actuator (1200) in the first direction.

[0126] Fig. 11 is a perspective view of a shield can according to an embodiment.

[0127] Referring to FIGS. 1, 2 and 11, a camera module (1000) according to an embodiment may include a shield can (1500) surrounding a circuit board (1600).

[0128] A shield can (1500) can surround a circuit board (1600). The shield can (1500) can surround the first, second, and third camera actuators (1100, 1200, 1300) from the outside. An outer side surface of the shield can (1500) can be in contact with an inner side surface of the body (1400). An x-axis or first direction width of the shield can (1500) can be narrower than an x-axis or first direction width of the body (1400). The shield can (1500) can include a groove (1510). The groove (1510) can be disposed on one surface of the shield can (1500). The shield can (1500) can include an opening through which light enters. The opening can be disposed on one surface of the shield can (1500). Light passing through the opening of the shield can (1500) can enter the interior of the third camera actuator.

[0129] The groove (1510) may penetrate a portion of one surface of the shield can (1500). The groove (1510) may have an opening shape having a certain width and depth. For example, the groove (1510) may include a rectangular opening. The groove (1510) may facilitate connection with the body (1400) that is arranged to surround the exterior of the shield can (1500). In addition, the formation of the groove (1510) may facilitate heat dissipation.

[0130] Fig. 12 is a perspective view of a circuit board according to an embodiment.

[0131] Referring to FIGS. 1, 2 and 12, a camera module (1000) according to an embodiment may include a circuit board (1600).

[0132] The circuit board (1600) may include an image sensor (IS), and the image sensor (IS) may be fixed inside the camera module (1000). The circuit board (1600) may be placed inside the shield can (1500). In addition, the circuit board (1600) may be electrically connected to another camera module in the terminal or a processor of the terminal. Through this, the camera actuator described above and the camera module including the same may transmit and receive various signals in the terminal. The circuit board (1600) may include a circuit board having a wiring pattern that can be electrically connected, such as a rigid printed circuit board (Rigid PCB), a flexible printed circuit board (Flexible PCB), or a rigid-flexible printed circuit board (Rigid-Flexible PCB). However, the present invention is not limited to these types.

[0133] The circuit board (1600) may include a first unit board (1610), a second unit board (1620), an image sensor (IS), and a connector (CN). The first unit board (1610) may fix the image sensor (IS). The image sensor (IS) may be disposed on one surface of the first unit board (1610). The first unit board (1610) and the image sensor (IS) may be electrically connected. The image sensor (IS) may be located on an inner surface of the first unit board (1610). For example, the image sensor (IS) may be in contact with the inner surface of the first unit board (1610).

[0134] The second unit substrate (1620) may be positioned on the side of the camera module (1000). The second unit substrate (1620) may be connected to the first unit substrate (1610). The second unit substrate (1620) may be connected to a connector (CN). The image sensor (IS) may receive light. The image sensor (IS) may receive light and convert the received light into an electrical signal. In addition, the image sensor (IS) may be formed of a plurality of pixels in an array form. And the image sensor (IS) may be positioned on the optical axis. The image sensor (IS) may be positioned at the rear end of the second camera actuator (1200). The image sensor (IS) may be positioned on the first unit substrate (1610). The image sensor (IS) may be electrically connected to the first unit substrate (1610). The image sensor (IS) may be positioned on the same optical axis as the first unit substrate (1610). The connector (CN) may be connected to the second unit substrate (1620). Through the connector (CN), the sensor module or circuit board may be electrically connected to an external electronic device. For example, the connector (CN) may be electrically connected to a processor, etc., of an electronic device such as a terminal.

[0135] Fig. 13 is a perspective view of a camera module according to an embodiment, Fig. 14 is an exploded perspective view of a camera module according to an embodiment, and Fig. 15 is a cross-sectional view taken along line AA' in Fig. 13.

[0136] Referring to FIGS. 13 and 14, a camera module (2000) according to an embodiment may be composed of a cover (CV), an OIS actuator (2100), a camera actuator (2200), and a circuit board (2300).

[0137] The cover (CV) can cover the OIS actuator (2100) and / or the camera actuator (2200). The cover (CV) can improve the bonding force between the OIS actuator (2100) and the camera actuator (2200).

[0138] Furthermore, the cover (CV) may be made of a material that blocks electromagnetic waves. Accordingly, the OIS actuator (2100) and the camera actuator (2200) within the cover (CV) can be easily protected.

[0139] In an embodiment, the OIS actuator (2100) can change the path of light. In an embodiment, the OIS actuator (2100) can change the path of light vertically through an internal optical member (e.g., a mirror or a prism). By this configuration, even if the thickness of the mobile terminal is reduced, a lens configuration larger than the thickness of the mobile terminal can be placed within the mobile terminal through the change of the path of light, thereby performing magnification, auto-focusing (AF), and OIS (Optical Image Stabilizer) functions.

[0140] The OIS actuator (2100) can change the optical path from the second direction to the third direction.

[0141] Additionally, the OIS actuator (2100) may include a lens disposed in a predetermined barrel (not shown). For example, the lens may include a fixed focal length lens. Such a fixed focal length lens may also be referred to as a “single focal length lens” or “single lens.”

[0142] The camera actuator (2200) may be positioned behind the OIS actuator (2100). The camera actuator (2200) may be coupled with the OIS actuator (2100). The coupling between the two may be achieved in various ways.

[0143] Additionally, the camera actuator (2200) may be a zoom actuator or an auto focus (AF) actuator. For example, the camera actuator (2200) may support one or more lenses and move the lenses according to a control signal from a predetermined control unit to perform an auto focus function or a zoom function.

[0144] The circuit board (2300) may be placed at the rear end of the camera actuator (2200). The circuit board (2300) may be electrically connected to the camera actuator (2200) and the OIS actuator (2100). In addition, there may be a plurality of circuit boards (2300).

[0145] This circuit board (2300) is connected to the housing of the camera actuator (2200), and an image sensor may be provided. Furthermore, a base portion including a filter may be mounted on the circuit board (2300).

[0146] The camera module according to the embodiment may be comprised of a single or multiple camera modules. For example, the multiple camera modules may include a first camera module and a second camera module. Furthermore, as described above, the camera module may be used interchangeably with terms such as "camera device," "camera device," "imaging device," "imaging module," and "imaging device."

[0147] And the first camera module may include a single or multiple actuators. For example, the first camera module may include an OIS actuator (2100) and a camera actuator (2200).

[0148] And the second camera module may be placed in a predetermined housing (not shown) and may include an actuator (not shown) capable of driving a lens unit. The actuator may be a voice coil motor, a micro actuator, a silicon actuator, etc., and may be applied in various ways such as an electrostatic method, a thermal method, a bimorph method, an electrostatic force method, etc., but is not limited thereto. In addition, the camera actuator in this specification may be referred to as an actuator, etc. In addition, a camera module composed of a plurality of camera modules may be mounted in various electronic devices such as a mobile terminal.

[0149] Referring to FIG. 15, a camera module according to an embodiment may include an OIS actuator (2100) having an OIS function and a camera actuator (2200) having a zooming function and an AF function.

[0150] Light can be incident into the camera module through an aperture area located on the upper surface of the OIS actuator (2100). That is, the light is incident into the interior of the OIS actuator (2100) along an optical axis direction (e.g., Y-axis direction) and the light path can be changed to a vertical direction (e.g., Z-axis direction) through an optical member. Then, the light can pass through the camera actuator (2200) and be incident on an image sensor located at one end of the camera actuator (2200) (PATH).

[0151] And by this configuration, the camera module according to the embodiment can improve the spatial limitations of the OIS actuator and the camera actuator by changing the light path. That is, the camera module according to the embodiment can expand the light path while minimizing the thickness of the camera module in response to the change in the light path. Furthermore, it should be understood that the camera actuator can also provide a high range of magnification by controlling the focus, etc. in the expanded light path.

[0152] In addition, the camera module according to the embodiment can implement OIS by controlling the optical path through the OIS actuator, thereby minimizing the occurrence of decent or tilt phenomena and producing the best optical characteristics.

[0153] Furthermore, the camera actuator (2200) may include an optical system and a lens driving unit. For example, the camera actuator (2200) may include at least one of a first lens assembly, a second lens assembly, a third lens assembly, and a guide pin.

[0154] Additionally, the camera actuator (2200) is equipped with a coil and a magnet to perform a high-magnification zooming function.

[0155] For example, the first lens assembly and the second lens assembly may be moving lenses that move via coils, magnets, and guide pins, and the third lens assembly (not shown) may be a fixed lens, but is not limited thereto. For example, the third lens assembly may function as a focal point that focuses light at a specific location, and the second lens assembly may function as a variator that refocuses the image focused by the third lens assembly, which is a focal point, at another location. Meanwhile, in the second lens assembly, the distance to the subject or the image distance may change significantly, resulting in a large change in magnification, and the second lens assembly, which is a variator, may play an important role in the change in the focal length or magnification of the optical system. Meanwhile, the image point focused by the second lens assembly, which is a variator, may have a slight difference depending on the location. Accordingly, the first lens assembly may function to compensate for the position of the image focused by the variator. For example, the first lens assembly may function as a compensator, accurately focusing the image formed by the second lens assembly onto the actual image sensor location. For example, the first lens assembly and the second lens assembly may be driven by electromagnetic force resulting from the interaction of a coil and a magnet.

[0156] Fig. 16 is a configuration diagram of a camera actuator according to an embodiment, and Fig. 17 is a configuration diagram of a driving unit according to an embodiment.

[0157] Referring to FIG. 16, the camera actuator (2200) may include a housing (2210), a lens assembly (2220), a driving unit (2230), a sensor unit (2240), and a monitoring unit (2250).

[0158] The housing (2210) can constitute the outer wall of the camera actuator (2200). The lens assembly (2220), driving unit (2230), sensor unit (2240), and monitoring unit (2250) can be placed inside the housing (2210).

[0159] The lens assembly (2220) may be a moving lens that moves using a coil, a magnet, and a guide pin. The lens assembly (2220) may include a first lens assembly and a second lens assembly. The first lens assembly may perform a variator function to refocus an image formed by focusing light on another location. Meanwhile, in the first lens assembly, the distance to the subject or the image distance may change significantly, resulting in a large change in magnification, and the first lens assembly, which is a variator, may play an important role in the change in the focal length or magnification of the optical system. Meanwhile, the point of interest formed by the first lens assembly, which is a variator, may have a slight difference depending on the location. Accordingly, the second lens assembly may perform a position compensation function for the image formed by the variator. For example, the second lens assembly may perform a compensator function that accurately focuses the point of interest formed by the first lens assembly, which is a variator, on the actual image sensor location. For example, the first lens assembly and the second lens assembly can be driven by electromagnetic force due to the interaction of a coil and a magnet.

[0160] The lens assembly (2220) may be placed inside the housing (2210). The lens assembly (2220) may move inside the housing (2210) along the optical axis direction by the driving unit (2230). The lens assemblies (2220) may be placed spaced apart from each other along the optical axis direction. The lens assembly (2220) may be driven by a coil and a magnet. A magnet yoke may be placed on the lens assembly (2220) to fix the magnet.

[0161] The lens assembly (2220) can move a certain distance along the optical axis direction. The lens assembly (2220) can move a certain distance according to a driving signal of the driving unit (2230). The driving of the lens assembly (2220) can vary depending on the intensity of the current applied to the driving unit (2230).

[0162] The driving unit (2230) can move the lens assembly (2220) in the direction of the optical axis. The driving unit (2230) can move the lens assembly (2220) up and down along the direction of the optical axis. The driving unit (2230) can be placed inside the housing (2210). The driving unit (2230) can move the lens assembly (2220) by using the electromagnetic force of the coil and the magnet. The driving unit (2230) can move the lens assembly (2220) by applying a current to the coil and applying an electromagnetic force to the magnet attached to the lens assembly (2220).

[0163] The sensor unit (2240) can detect the position of the lens assembly (2220). The sensor unit (2240) can detect the current position of the lens assembly (2220), generate a feedback signal according to the current position of the lens assembly (2220), and provide the feedback signal to the comparison unit (2233). The sensor unit (2240) can include a position detection element and an analog-to-digital converter. The sensor unit (2240) can detect the strength of the magnetic field of the magnet attached to the lens assembly (2220).

[0164] The monitoring unit (2250) can measure the current of the driving unit (2230). The monitoring unit (2250) can measure the intensity of the current flowing in the driving unit (2230). The intensity of the current flowing in the driving unit (2230) can vary depending on the lens assembly control range required for the driving unit (2230). When the movement distance of the lens assembly (2220) is long, a higher current flows. The current of the driving unit (2230) can vary depending on the driving signal generated by the driving circuit (2234). The monitoring unit (2250) can detect the driving signal of the driving circuit (2234). The monitoring unit (2250) can measure the current of the driving unit (2230) and compare it with a reference value. The range of current at which the driving unit (2230) can be driven has a threshold. If the current of the driving unit (2230) exceeds the reference value, the integral value of the error accumulates significantly, and even if the error value is corrected, there may be a problem in that the lens assembly (2220) cannot reach the target position. The monitoring unit (2250) can compare the current of the driving unit (2230) with a reference value to determine whether the current of the driving unit (2230) is greater than the reference value. The monitoring unit (2250) can compare the current of the driving unit (2230) with a reference value to determine whether the current of the driving unit (2230) is greater than the reference value and provide the determination result to the tuner (2232).

[0165] Referring to FIG. 17, the driving unit (2230) may include a control unit (2231), a tuner (2232), a comparison unit (2233), and a driving circuit (2234).

[0166] The control unit (2231) can generate a control signal by applying a control gain to the error value provided from the comparison unit (2233). For example, the control unit (2231) can perform control using a PID (Proportional-Integral-Derivative) method, including a PID controller. The control unit (2231) can generate a control signal by applying a control gain according to PID control to the error value. The control unit (2231) can perform control proportional to the size of the error value in the current state according to proportional control, perform control to reduce the error in a steady state according to integral control, and perform control to reduce overshoot by preventing abrupt changes according to derivative control. The control unit (2231) can generate a control signal and provide it to the driving circuit (2234).

[0167] The tuner (2232) can initialize the control gain of the control unit (2231) when the monitoring unit (2250) determines that the current of the driving unit (2230) exceeds the reference value. The tuner (2232) can receive the determination result of whether the current of the driving unit (2230) exceeds the reference value from the monitoring unit (2250). When the monitoring unit (2250) determines that the current of the driving unit (2230) exceeds the reference value, the tuner (2232) can initialize the control gain of the control unit (2231) and then return the control gain to its original state after a certain period of time. The tuner (2232) can initialize the first control gain to 0 simultaneously. In addition, the tuner (2232) can sequentially return the first control gain to its original state.

[0168] The comparison unit (2233) can calculate an error value by comparing the position of the lens assembly (2220) detected by the sensor unit (2240) with the target position. The comparison unit (2233) can calculate an error value by comparing the target position of the lens assembly (2220) according to the signal input to the driving unit (2230) with the current position of the lens assembly (2220) according to the signal detected by the sensor unit (2240). The current position of the lens assembly (2220) detected by the sensor unit (2240) can be input to the comparison unit (2233) as a feedback signal. The movement distance and movement direction of the lens assembly (2220) can be determined by the error value calculated by the comparison unit (2233). The comparison unit (2233) can provide the calculated error value to the control unit (2231).

[0169] The driving circuit (2234) can generate a driving signal to move the lens assembly (2220) according to a control signal. The driving circuit (2234) can receive a control signal provided by the control unit (2231) and generate the driving signal. The lens assembly (2220) can move from a current position to a target position by the driving signal generated by the driving circuit (2234). The driving circuit (2234) can include an H-bridge circuit. The driving signal of the driving circuit (2234) can include a form of current, and the driving circuit (2234) can provide the driving signal to a coil of the camera actuator (2200).

[0170] Fig. 18 is a flowchart explaining the operating principle of a camera actuator according to an embodiment, and Fig. 19 is a graph showing the change in state over time of a camera actuator according to an embodiment.

[0171] Referring to FIG. 18, the camera actuator can set a target position. The target position and movement distance of the lens assembly can be determined based on the target position set for the camera actuator. The control signal generated by the control unit (2231) can vary depending on the target position of the camera actuator. The control unit (2231) can receive target position information. The control unit (2231) can receive target position information and generate a control signal based on the target position.

[0172] The control unit (2231) can generate a control signal based on target position information. The control unit (2231) can generate the control signal and provide it to the driving circuit (2234). The control unit (2231) can provide the control signal to the driving circuit (2234) to operate the driving circuit (2234).

[0173] The driving circuit (2234) can generate a driving signal to move the lens assembly. The driving circuit (2234) can receive a control signal from the control unit (2231) and generate the driving signal. The lens assembly can move according to the driving signal of the driving circuit (2234). The driving signal of the driving circuit (2234) can include a form of current or voltage. The driving signal of the driving circuit (2234) can be applied to a coil to apply an electromagnetic force to a magnet attached to the lens assembly, thereby moving the lens assembly.

[0174] The sensor unit (2240) can measure the position of the lens assembly that has moved according to the driving signal. The sensor unit (2240) can set a target position and measure the current position of the moved lens assembly. The sensor unit (2240) can measure the current position of the lens assembly and provide the measurement result to the comparison unit (2233).

[0175] The comparison unit (2233) can calculate an error value of the position of the lens assembly. The comparison unit (2233) can receive current position information of the lens assembly from the sensor unit (2240). In addition, the comparison unit (2233) can receive target position information of the lens assembly. The comparison unit (2233) can calculate an error value by comparing the target position information of the lens assembly with the current position information of the lens assembly. The comparison unit (2233) can provide the calculated error value information to the control unit (2231).

[0176] The control unit (2231) can generate a new control signal by applying a control gain based on error value information received from the comparison unit (2233) to an existing control signal. The control unit (2231) can generate a new control signal and provide it to the driving circuit (2234).

[0177] The driving circuit (2234) can receive a new control signal and generate a corrected driving signal. The lens assembly can move according to the corrected driving signal of the driving circuit (2234). The lens assembly can move to a corrected position closer to the target position according to the corrected driving signal.

[0178] The camera actuator can repeat the process of correcting the position of the lens assembly to reduce the error value, thereby moving the lens assembly closer to the target position.

[0179] While this process is repeated, the monitoring unit (2250) can measure the current of the driving unit. The monitoring unit (2250) can measure the intensity of the current flowing in the driving circuit (2234). The intensity of the current flowing in the driving circuit (2234) may vary depending on the driving signal generated by the driving circuit (2234). The monitoring unit (2250) can measure the current of the driving circuit (2234) and compare it with a reference value. The reference value may mean a limit current value at which the driving circuit (2234) can operate normally. The monitoring unit (2250) can compare the current of the driving circuit (2234) with the reference value to determine whether the current exceeds the reference value. If the monitoring unit (2250) determines that the current of the driving circuit (2234) exceeds the reference value, the monitoring unit (2250) can transmit the determination result to the tuner (2232). If the monitoring unit (2250) determines that the current of the driving circuit (2234) is less than the reference value, the camera actuator can be driven as is according to the driving signal of the driving circuit (2234).

[0180] The tuner (2232) can initialize the control gain of the control unit (2231) when the monitoring unit (2250) determines that the current of the driving circuit (2234) exceeds the reference value. The tuner (2232) can receive a determination result from the monitoring unit (2250) as to whether the current of the driving circuit (2234) exceeds the reference value. When the monitoring unit (2250) determines that the current of the driving unit (2230) exceeds the reference value, the tuner (2232) can initialize the control gain of the control unit (2231) and then return the control gain to its original state after a certain period of time.

[0181] The control unit (2231) can generate a control signal by applying an initialized control gain and transmit the generated control signal to the driving circuit (2234).

[0182] Referring to FIGS. 18 and 19, when the current (I) of the driving unit exceeds the reference value (It), the current position of the lens assembly does not reach the target position.

[0183] When the current (I) of the driving unit exceeds the reference value (It), the tuner (2232) can initialize the control gain (g) of the control unit (2231). The control gain (g) may include a first control gain, a third control gain (g1, g2, g3). The first control gain (g1) may be a proportional control gain, the second control gain (g2) may be an integral control gain, and the third control gain (g3) may be a differential control gain. When the monitoring unit (2250) determines that the current of the driving unit exceeds the reference value, the tuner (2232) may initialize the control gain (g) after a predetermined decision time (T). The tuner (2232) may initialize the control gain (g) after the decision time (T) has elapsed. Ultimately, the camera actuator according to the embodiment can provide a camera actuator with improved driving error by including a monitoring unit (2250) and a tuner (2232), and can also provide a camera actuator with improved defect occurrence. Furthermore, the frequency of sorting out defective products during camera actuator manufacturing can be improved, thereby increasing yield.

[0184] Referring to case 1 of FIG. 19, the tuner (2232) can set the control gain (g) to 0 when the monitoring unit (2250) determines that the current (I) of the driving unit exceeds the reference value (It). In this case, the tuner (2232) can initialize all control gains (g) to 0 at the same time, regardless of the type of control gain. In addition, the tuner (2232) can return the control gains (g) to the original state after a certain recovery time (t) has passed after initializing them. In this case, the tuner (2232) can return all control gains (g) to the original state at the same time, regardless of the type of control gain.

[0185] Referring to case 2 of FIG. 19, the tuner (2232) can simultaneously set the first to third control gains (g1, g2, g3) to 0 when the monitoring unit (2250) determines that the current (I) of the driving unit exceeds the reference value (It). In addition, the tuner (2232) can return the first to third control gains (g1, g2, g3) to their original states after a certain recovery time (t1, t2, t3) after initializing the first to third control gains (g1, g2, g3). In this case, the recovery times (t1, t2, t3) of the first to third control gains (g1, g2, g3) may be different from each other. The recovery time (t1) of the first control gain (g1) may be shorter than the recovery time (t2) of the second control gain (g2), and the recovery time (t2) of the second control gain (g2) may be shorter than the recovery time (t3) of the third control gain (g3). The tuner (2232) may return the first control gain (g1), the second control gain (g2), and the third control gain (g3) to their original states in that order. By differently adjusting the recovery times (t1, t2, t3) of the first to third control gains (g1, g2, g3), the driving range performance and characteristics of the camera actuator may be controlled more efficiently.

[0186] Fig. 20 is a flowchart of a method for controlling a camera actuator according to an embodiment.

[0187] Referring to FIG. 20, a method for controlling a camera actuator may include a step (S110) in which a monitoring unit measures a current flowing to a driving unit, a step (S120) in which the monitoring unit determines whether the current flowing to the driving unit exceeds a reference value, and a step (S130) in which a tuner initializes a control gain of a control unit to 0 if the current flowing to the driving unit exceeds the reference value.

[0188] Additionally, the method for controlling a camera actuator may include a step (S140) in which the tuner returns the control gain to its original state. The step of returning the control gain to its original state may be performed after the step (S130) in which the tuner initializes the control gain of the control unit to 0.

[0189] Additionally, the method for controlling the camera actuator may include a step in which the sensor unit detects the current position of the lens assembly.

[0190] Additionally, the control method of the camera actuator may include a step of comparing the position of the lens assembly detected by the sensor unit with the target position to calculate an error value.

[0191] Additionally, the control method of the camera actuator may include a step of the control unit generating a control signal by applying a control gain corresponding to an error value.

[0192] Additionally, the method for controlling the camera actuator may include a step of generating a driving signal for the driving unit to move the lens assembly according to the control signal.

[0193] Fig. 21 is a graph showing the state change over time of a conventional camera actuator, and Fig. 22 is a graph showing the state change over time of a camera actuator according to an embodiment.

[0194] Referring to Fig. 21, it can be confirmed that the position of the lens assembly in the conventional camera actuator does not reach the target position. a1 represents the position of the lens assembly over time. b1 represents the current value of the driving circuit over time. The target position of the lens assembly may be 1850. Referring to part K1, it can be confirmed that the current value of the driving circuit exceeds the reference value, so that the driving unit is in a current saturation state, and accordingly, the lens assembly does not reach the target position.

[0195] Referring to FIG. 22, the camera actuator according to the embodiment can confirm that the lens assembly can reach the target position. a2 represents the position of the lens assembly over time. b2 represents the current value of the driving circuit over time. The target position of the lens assembly may be 1850. Referring to part K2, it can be confirmed that the current value of the driving circuit is in a normal state where it does not exceed a reference value, and accordingly, the lens assembly has reached the target position. Consequently, according to the embodiment, a camera actuator with improved driving error and a control method thereof can be provided, and a camera actuator with improved defect occurrence can be provided. In addition, the yield can be increased by improving the frequency of sorting out defective products during the production of the camera actuator.

[0196] Fig. 23 is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied.

[0197] Referring to FIG. 23, the mobile terminal of the embodiment may include a camera module (1), a flash module (3), and an autofocus device (2) provided on the rear.

[0198] The camera module (1) may include an image capturing function and an autofocus function. For example, the camera module (1) may include an autofocus function using an image.

[0199] The camera module (1) processes still image or video image frames obtained by the image sensor in shooting mode or video call mode.

[0200] The processed image frame can be displayed on a predetermined display unit and stored in memory. A camera (not shown) may also be placed on the front of the mobile terminal body.

[0201] For example, the camera module (1) may include a first camera module and a second camera module, and the first camera module may be capable of implementing OIS together with AF or zoom functions. In addition, the second camera module may be capable of implementing AF, zoom, and OIS functions. In this case, since the first camera module includes both the OIS actuator and the camera actuator described above, miniaturization of the camera module can be easily achieved through changing the optical path.

[0202] The flash module (3) may include a light-emitting element that emits light internally. The flash module (3) may be operated by the camera operation of the mobile terminal or by the user's control.

[0203] The autofocus device (2) may include one of the packages of surface-emitting laser elements as a light-emitting unit.

[0204] The autofocus device (2) may include an autofocus function using a laser. The autofocus device (2) may be mainly used in conditions where the autofocus function using the image of the camera module (1) is degraded, such as at a close range of 10 m or less or in a dark environment.

[0205] The autofocus device (2) may include a light emitting unit including a vertical cavity surface emitting laser (VCSEL) semiconductor element and a light receiving unit that converts light energy into electrical energy, such as a photodiode.

[0206] Fig. 24 is a perspective view of a vehicle to which a camera module according to an embodiment is applied.

[0207] For example, FIG. 24 is an exterior view of a vehicle equipped with a vehicle driving assistance device to which a camera module according to an embodiment is applied.

[0208] Referring to FIG. 24, the vehicle (700) of the embodiment may be equipped with wheels (13FL, 13FR) that rotate by a power source and a predetermined sensor. The sensor may be a camera sensor (3000), but is not limited thereto.

[0209] The camera sensor (3000) may be a camera sensor to which a camera module according to an embodiment is applied. The vehicle (700) of the embodiment can obtain image information through the camera sensor (3000) that captures a forward image or a surrounding image, and can use the image information to determine a lane non-identification situation and create a virtual lane when the lane is not identified.

[0210] For example, a camera sensor (3000) can capture a front image of a vehicle (700) and a processor (not shown) can analyze an object included in the front image to obtain image information.

[0211] For example, if objects such as a center divider, curb, or street tree, which correspond to a lane, adjacent vehicle, traffic obstruction, or indirect road marking, are captured in an image captured by a camera sensor (3000), the processor can detect these objects and include them in the image information. At this time, the processor can obtain distance information from the object detected through the camera sensor (3000) to further supplement the image information.

[0212] The image information may be information about an object captured in the image. The camera sensor (3000) may include an image sensor and an image processing module.

[0213] The camera sensor (3000) can process still images or moving images obtained by an image sensor (e.g., CMOS or CCD).

[0214] The image processing module can process still images or videos acquired through an image sensor, extract necessary information, and transmit the extracted information to the processor.

[0215] At this time, the camera sensor (3000) may include a stereo camera to improve the measurement accuracy of the object and to secure more information such as the distance between the vehicle (700) and the object, but is not limited thereto.

[0216] Although the above description focuses on examples, these are merely examples and do not limit the present invention. Those skilled in the art will appreciate that various modifications and applications not exemplified above are possible without departing from the essential characteristics of the present invention. For example, each component specifically shown in the examples can be modified and implemented. In addition, differences related to such modifications and applications should be construed as being included within the scope of the present invention defined in the appended claims.

Claims

1. First camera actuator; A second camera actuator arranged in a first direction from the first camera actuator; A circuit board including an image sensor arranged at the rear end of the second camera actuator; and A third camera actuator is included, which is positioned on top of the first camera actuator or the second camera actuator. The above third camera actuator includes a magnification lens, The above magnification lens is a camera module that moves in a first direction from the top of the first camera actuator or the second camera actuator.

2. In paragraph 1, The above first camera actuator comprises a prism, The above magnifying lens overlaps the above prism in the second direction, A camera module wherein the second direction is the incident direction of light and is a direction perpendicular to the first direction.

3. In paragraph 2, A camera module in which the magnifying lens is arranged perpendicular to the second direction and passes the light through the prism.

4. In paragraph 2, The third camera actuator includes a lens assembly that moves in the first direction, The above lens assembly is a camera module combined with the above magnification lens.

5. In paragraph 4, The above lens assembly includes a fixing member surrounding the above magnification lens, The above fixed part is a camera module arranged perpendicular to the second direction.

6. In paragraph 2, A camera module wherein the first direction width of the third camera actuator is larger than the first direction width of the first camera actuator and smaller than the sum of the first direction widths of the first camera actuator and the second camera actuator.

7. In paragraph 2, A camera module wherein the first direction width of the third camera actuator is greater than twice the first direction width of the magnification lens.

8. In paragraph 4, A camera module wherein the first direction movement distance of the lens assembly is greater than the first direction width of the magnification lens.

9. In paragraph 2, A camera module wherein the third camera actuator includes a first region overlapping the first camera actuator in the second direction and a second region overlapping the second camera actuator in the second direction.

10. In paragraph 9, A camera module wherein the first direction width of the first region is smaller than the first direction width of the second region.

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