Camera actuator and camera module comprising same

Abstract

A camera actuator according to an embodiment of the present invention comprises: a housing; a lens assembly including at least one lens in the housing and moving in the optical axis direction; first to third ball guide parts disposed on one outer side of the lens assembly; and a driving part that moves the lens assembly, wherein the first to third ball guide parts are configured such that balls move in respective recesses, and the driving part may move the lens assembly together with the balls included in the first to third ball guide parts.

Description

Camera actuator and camera module including the same

[0001] The present invention relates to a camera actuator and a camera module including the same.

[0002] A camera is a device that captures subjects in photos or videos, and it is mounted on portable devices, drones, vehicles, etc. To improve image quality, camera modules may feature Image Stabilization (IS) to correct or prevent image shake caused by user movement, Auto Focusing (AF) to automatically adjust the distance between the image sensor and the lens to align the lens focal length, and Zooming to increase or decrease the magnification of distant subjects using a zoom lens.

[0003] The function of such a camera module can be performed through the movement of the lens, but there is a problem in that accurate and precise movement of the lens is required.

[0004] The technical problem that the embodiment of the present invention aims to solve is to provide a camera actuator and a camera module using a 3-ball guide section.

[0005] In addition, an embodiment of the present invention provides a camera actuator and a camera module capable of securing clear guidance in the movement of a lens assembly using a 3-ball guide section.

[0006] In addition, embodiments of the present invention may provide a camera actuator and a camera module with improved dynamic tilt and / or decentering of the lens.

[0007] In addition, embodiments of the present invention can provide a camera actuator and a camera module that minimize escape and impact of the lens.

[0008] In addition, embodiments of the present invention can provide a camera actuator and a camera module capable of reducing flare generation.

[0009] In addition, embodiments of the present invention can provide a camera actuator and a camera module that are robust against impact.

[0010] The problems intended to be solved in the embodiments are not limited thereto, and may also include objectives or effects that can be identified from the means of solving the problems or the forms of implementation described below.

[0011] A camera actuator according to an embodiment of the present invention comprises a housing, a lens assembly that moves in the direction of an optical axis including at least one lens within the housing, first to third ball guide portions disposed on one side outside the lens assembly, and a driving portion that moves the lens assembly, wherein each of the first to third ball guide portions is configured so that a ball moves in a respective recess, and the driving portion can move the lens assembly together with the balls included in the first to third ball guide portions.

[0012] In a camera actuator according to an embodiment of the present invention, the driving unit includes a magnet disposed on one side of the outside of the lens assembly and a coil disposed on the inside of the housing, and the third ball guide unit may be disposed to face the first ball guide unit and the second ball guide unit with the magnet as the center.

[0013] In a camera actuator according to an embodiment of the present invention, the first to third ball guide portions may be configured so that the ball can rotate and move on each recess.

[0014] In a camera actuator according to an embodiment of the present invention, the first to third ball guide portions may be configured so that a ball can slide and move on each recess.

[0015] In a camera actuator according to an embodiment of the present invention, one of the first to third ball guide portions is configured so that the ball can rotate and move on the recess, and the other two may be configured so that the ball can slide and move on the recess.

[0016] A camera actuator according to an embodiment of the present invention may further include a magnet guide portion capable of guiding the assembly of the magnet on one side of the lens assembly.

[0017] In a camera actuator according to an embodiment of the present invention, the magnet guide portion may have the shape of 'ㄱ' or 'ㄴ'.

[0018] In a camera actuator according to an embodiment of the present invention, the height of the magnet guide portion from one side of the lens assembly may be lower than the height of the ball included in the first to third ball guide portions.

[0019] In a camera actuator according to an embodiment of the present invention, a yoke portion is further disposed between one side of the lens assembly and the magnet, and both sides of the yoke portion are bent in the direction in which the lens assembly moves to prevent the magnet from detaching when the lens assembly moves.

[0020] In a camera actuator according to an embodiment of the present invention, the height of the magnet guide portion from one side of the lens assembly may be lower than the height of the bent portion of the yoke portion.

[0021] In a camera actuator according to an embodiment of the present invention, the height of the magnet guide portion from one side of the lens assembly may be higher than the lower surface of the yoke portion.

[0022] A camera actuator according to an embodiment of the present invention further includes a main stopper and a sub stopper that come into contact with the lens assembly as the lens assembly moves, and the lens assembly may come into contact with the sub stopper first before coming into contact with the main stopper.

[0023] A camera actuator according to an embodiment of the present invention may further include a rib on the inner edge of the housing.

[0024] In a camera actuator according to an embodiment of the present invention, the rib may be located on the inner side facing the outer side opposite to the lens assembly where the first to third ball guide portions are disposed on the inner side of the housing.

[0025] A camera module according to an embodiment of the present invention comprises a camera actuator, a zoom module, a circuit board, and a bracket, wherein the camera actuator comprises a housing, a lens assembly that moves in the direction of an optical axis including at least one lens within the housing, first to third ball guide portions disposed on one side outside the lens assembly, and a driving portion that moves the lens assembly, wherein each of the first to third ball guide portions is configured so that a ball moves in a respective recess, and the driving portion can move the lens assembly together with the balls included in the first to third ball guide portions.

[0026] According to an embodiment of the present invention, a camera actuator and a camera module using a 3-ball guide can be implemented.

[0027] According to an embodiment of the present invention, clear guidance can be secured during the movement of the lens assembly by using three ball guide sections.

[0028] According to an embodiment of the present invention, the dynamic tilt and / or decenter of the lens can be improved.

[0029] According to an embodiment of the present invention, a ball guide part can be selected by considering the dynamic tilt of the lens, decenter control, driving force of the camera actuator, etc.

[0030] According to an embodiment of the present invention, escape and impact of the lens in the camera actuator and camera module can be minimized.

[0031] According to an embodiment of the present invention, a camera actuator and a camera module capable of reducing flare generation can be implemented.

[0032] According to an embodiment of the present invention, a camera actuator and camera module that are robust against impact can be implemented.

[0033] The various and beneficial advantages and effects of the present invention are not limited to those described above and may be more easily understood in the process of explaining specific embodiments of the present invention.

[0034] FIG. 1 is a perspective view of a camera module according to one embodiment.

[0035] FIG. 2 is an exploded perspective view of a camera module according to one embodiment.

[0036] Figure 3 is a view of Figure 1 as seen from AA'.

[0037] FIG. 4 is a perspective view of a second camera actuator according to one embodiment of the present invention.

[0038] FIG. 5 is an exploded perspective view of a second camera actuator according to one embodiment of the present invention.

[0039] FIGS. 6a and 6b are cross-sectional views of a second camera actuator according to the movement of a lens assembly according to an embodiment of the present invention.

[0040] FIG. 7 is a front view of a second camera actuator according to one embodiment of the present invention.

[0041] FIGS. 8a to 8d are side views of a lens assembly in which a ball guide portion is arranged in a second camera actuator according to various embodiments of the present invention.

[0042] FIG. 9 is a perspective view of a mobile terminal with a camera module applied according to an embodiment.

[0043] FIG. 10 is a perspective view of a vehicle with a camera module applied according to an embodiment.

[0044] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings.

[0045] However, the technical concept of the present invention is not limited to some of the described embodiments but can be implemented in various different forms, and within the scope of the technical concept of the present invention, one or more of the components among the embodiments may be selectively combined or substituted.

[0046] In addition, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a sense that is generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms that are commonly used, such as terms defined in advance, may be interpreted in consideration of their meaning in the context of the relevant technology.

[0047] Furthermore, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention.

[0048] In this specification, the singular form may include the plural form unless specifically stated otherwise in the text, and when described as "at least one of A and B and C (or more than one)," it may include one or more of all combinations that can be formed from A, B, and C.

[0049] In addition, terms such as first, second, A, B, (a), (b), etc. may be used when describing the components of the embodiments of the present invention.

[0050] These terms are intended merely to distinguish a component from other components and are not limited by the nature, order, sequence, etc., of the said component.

[0051] And, where it is stated that a component is 'connected', 'combined', or 'joined' to another component, this may include not only cases where the component is directly connected, combined, or joined to the other component, but also cases where it is 'connected', 'combined', or 'joined' due to another component located between the component and the other component.

[0052] Furthermore, when described as being formed or placed "above or below" each component, "above" or "below" includes not only cases where two components are in direct contact with each other, but also cases where one or more other components are formed or placed between the two components. Additionally, when expressed as "above or below," it may include the meaning of a downward direction as well as an upward direction relative to a single component.

[0053] FIG. 1 is a perspective view of a camera module according to one embodiment, FIG. 2 is an exploded perspective view of a camera module according to one embodiment, and FIG. 3 is a view taken from FIG. 1 as AA'.

[0054] Referring to FIGS. 1 and 2, a camera module (1000) according to one embodiment may include a cover (CV), a first camera actuator (1100), a second camera actuator (1200), and a circuit board (1300). Here, the first camera actuator (1100) may be used as the first actuator, and the second camera actuator (1200) may be used as the second actuator.

[0055] The cover (CV) can cover the first camera actuator (1100) and the second camera actuator (1200). The coupling force between the first camera actuator (1100) and the second camera actuator (1200) can be improved by the cover (CV). Accordingly, the first camera actuator (1100) and the second camera actuator (1200) within the cover (CV) can be easily protected. Furthermore, the cover (CV) may be composed of a material that performs electromagnetic shielding.

[0056] The first camera actuator (1100) may be an OIS (Optical Image Stabilizer) actuator. For example, the first camera actuator (1100) may move an optical member in a direction perpendicular to the optical axis (axis of incident light).

[0057] The first camera actuator (1100) may include a fixed focal length lens disposed in a predetermined barrel (not shown). The fixed focal length lens may also be referred to as a "single focal length lens" or a "single lens."

[0058] Additionally, 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 element (e.g., a prism or a mirror). For example, the optical element can change the light from a first direction (X-axis direction) to a third direction (Z-axis direction). Or the optical element can change the light from a first axis to a second axis. With 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 light path, so that magnification, autofocus (AF), zoom, and OIS functions can be performed.

[0059] However, it is not limited to this, and the first camera actuator (1100) can change the light path multiple times vertically or at a predetermined angle.

[0060] The second camera actuator (1200) may be positioned at the rear end of the first camera actuator (1100). The second camera actuator (1200) may be coupled with the first camera actuator (1100). And the coupling between them may be achieved in various ways.

[0061] The second camera actuator (1200) may be a zoom actuator or an AF (Auto Focus) 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-focusing function or a zoom function.

[0062] The circuit board (1300) may be placed at the rear end of the second camera actuator (1200). The circuit board (1300) may be electrically connected to the second camera actuator (1200) and the first camera actuator (1100). Additionally, there may be multiple circuit boards (1300).

[0063] The camera module according to the embodiment may be composed of a single or multiple camera modules. For example, the multiple camera modules may include a first camera module and a second camera module.

[0064] 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) and a second camera actuator (1200).

[0065] The second camera module may be disposed in a predetermined housing (not shown) and may include an actuator (not shown) capable of driving a lens portion. The actuator may be a voice coil motor, a micro actuator, a silicon actuator, etc., and various types such as electrostatic, thermal, bimorphic, and electrostatic force methods may be applied, but are not limited thereto. Furthermore, in the present disclosure, the term "camera actuator" may be used interchangeably with "actuator, etc." Additionally, a camera module composed of a plurality of camera modules may be mounted in various electronic devices such as mobile terminals. Furthermore, the actuator may be a device for moving or tilting a lens or an optical member. However, below, the term "actuator" is described as a concept that includes a lens or an optical member. Furthermore, the term "actuator" may be used interchangeably with "lens transfer device," "lens moving device," "optical member transfer device," "optical member moving device," etc.

[0066] Referring to FIG. 3, a camera module according to an embodiment may include a first camera actuator (1100) that performs an OIS function and a second camera actuator (1200) that performs a zooming function and an AF function.

[0067] Light can be incident into a camera module or the first camera actuator through an aperture region located on the upper surface of the first camera actuator (1100). That is, light is first incident into the interior of the first camera actuator (1100) along a vertical direction (e.g., X-axis direction, relative to the incident light), and the light path can be changed to the optical axis direction (e.g., Z-axis direction) through an optical member. Then, 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). In the present disclosure, the Z-axis direction or the third direction is described as the optical axis direction, the first direction and the X-axis direction as the vertical direction, and the second direction and the Y-axis direction as the horizontal direction as follows.

[0068] In addition, in the present disclosure, the bottom surface refers to one side in the first direction. The first direction is the X-axis direction in the drawing and may be used interchangeably with the first axis direction, etc. The second direction is the Y-axis direction in the drawing and may be used interchangeably with the second axis direction, etc. The second direction is a direction perpendicular to the first direction. In addition, the third direction is the Z-axis direction in the drawing and may be used interchangeably with the third axis direction, etc. Furthermore, the third direction is a direction perpendicular to both the first direction and the second direction. Here, the third direction (Z-axis direction) corresponds to the direction of the optical axis, and the first direction (X-axis direction) and the second direction (Y-axis direction) are directions perpendicular to the optical axis. In addition, in the description of the first and second camera actuators below, the optical axis direction is the third direction (Z-axis direction), and the description below is based on this.

[0069] Additionally, in the present disclosure, the inner side may be the direction toward the first camera actuator from the cover (CV), and the outer side may be the opposite direction to the inner side. That is, the first camera actuator and the second camera actuator may be located on the inner side of the cover (CV), and the cover (CV) may be located on the outer side of the first camera actuator or the second camera actuator.

[0070] And with this configuration, the camera module according to the embodiment can improve the spatial limitations of the first camera actuator and the second 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 second camera actuator can provide a high range of magnification by controlling focus, etc., in the expanded light path.

[0071] In addition, the camera module according to the embodiment can implement OIS by controlling the optical path through the first camera actuator (1100), thereby minimizing the occurrence of decent or tilt phenomena and producing optimal optical characteristics.

[0072] Furthermore, the second camera actuator (1200) may include an optical system and a lens driving unit. For example, at least one of a first lens assembly, a second lens assembly, and a third lens assembly may be disposed in the second camera actuator (1200).

[0073] Additionally, the second camera actuator (1200) is equipped with a coil and a magnet to perform high-magnification zooming and autofocus functions.

[0074] 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 may be a fixed lens, but is not limited thereto. For example, the third lens assembly may perform the function of a focuser that forms an image of light at a specific location, and the first lens assembly may perform the function of a variationator that re-forms the image formed by the third lens assembly (focuser) at a different location. Meanwhile, the first lens assembly may be in a state where the magnification changes significantly due to a large change in the distance to the subject or the image distance, and the first lens assembly (variator) may play an important role in the change of focal length or magnification of the optical system. On the other hand, the image formed by the first lens assembly (variator) may differ slightly depending on the location. Accordingly, the second lens assembly may perform a position compensation function for the image formed by the variationator. For example, the second lens assembly can perform the function of a compensator, which accurately forms the image formed by the first lens assembly (which acts as a transducer) at the actual image sensor location. For example, the first lens assembly and the second lens assembly can be driven by electromagnetic force resulting from the interaction between a coil and a magnet. The above description may be applied to the lens assembly described below. Furthermore, the first to third lens assemblies can move along the optical axis direction, that is, the third direction. The first to third lens assemblies can move in the third direction independently or dependently from one another. In the present invention, the first lens assembly and the second lens assembly can move along the optical axis direction. That is, the first and second lens assemblies may be moving parts. The third lens assembly may be located at the front end of the first lens assembly or at the rear end of the second lens assembly. The third lens assembly may not move in the optical axis direction.That is, the third lens assembly can be a fixed part.

[0075] Meanwhile, according to an embodiment of the present invention, even if an actuator for OIS and an actuator for AF / Zoom are arranged side by side, magnetic field interference with the magnet for AF / Zoom can be prevented when driving OIS. The first driving magnet of the first camera actuator (1100) can be arranged separately from the second camera actuator (1200) to prevent magnetic field interference between the first camera actuator (1100) and the second camera actuator (1200). In the present disclosure, OIS may be used interchangeably with terms such as hand shake correction, optical image stabilization, optical image correction, and shake correction.

[0076] In particular, the optical member (RM) in the first camera actuator (1100) can be tilted along the X-axis or the Y-axis. Accordingly, the change of the optical path can be easily performed according to the X-axis tilt or the Y-axis tilt.

[0077] The optical member (RM) may be mounted on a holder of the first camera actuator, etc. As an example, the optical member (RM) may be composed of a mirror or a prism. Although the following description is based on a prism, it may be composed of multiple lenses as in the above-described example. Alternatively, the optical member (RM) may be composed of multiple lenses and a prism or mirror. Furthermore, the optical member (RM) may include a reflective portion disposed inside. However, it is not limited thereto.

[0078] The optical member (RM) can be tilted along the X-axis or Y-axis by driving a VCM (Voice Coil Motor) or the like in the first camera actuator (1100). That is, OIS can be implemented while the optical member (RM) tilts or rotates with respect to the Y-axis direction or the X-axis direction.

[0079] FIG. 4 is a perspective view of a second camera actuator according to one embodiment of the present invention, and FIG. 5 is an exploded perspective view of a second camera actuator according to one embodiment of the present invention.

[0080] Referring to FIGS. 4 and 5, a second camera actuator (1200) (or camera device, zoom lens transfer device, zoom lens moving device, or lens transfer device) according to one embodiment of the present invention may include a housing (1210), a lens part (1220), a substrate part (1230), a driving part (1250), and a stopper (ST1 to ST4), etc. In addition, the second camera actuator (1200) may further include a shield can (not shown), an elastic part (not shown), and a joining member (not shown), etc.

[0081] A shield can (not shown) may be positioned in a region (e.g., the outermost) of the second camera actuator (1200) and configured to enclose the components described later (housing (1210), lens part (1220), driving part (1250), etc.). Such a shield can can block or reduce electromagnetic waves generated from the outside. Accordingly, the occurrence of malfunctions in the driving part (1250) may be reduced.

[0082] The housing (1210) may be positioned between the lens portion (1220) and the shield can (not shown). The housing (1210) may be positioned to surround the lens portion (1220). The housing (1210) may further include a cover base (CB). The housing (1210) may be joined to the cover base (CB) by a bonding member (e.g., epoxy).

[0083] A hole may be formed on the side of the housing (1210). A coil (1251) may be disposed in the hole. The hole may be positioned to correspond to a groove in the lens assembly (1222) to be described later. There may be only one coil (1251), but it is not limited thereto. According to one embodiment, a substrate portion (1230) may be further disposed on the outer surface of the side of the housing (1210).

[0084] The cover base (CB) can prevent the lens placed or received in the lens assembly (1222) from being damaged by impact. That is, the cover base (CB) can absorb the impact of the lens assembly (1222) when the lens assembly (1222) moves. Furthermore, the second stopper (ST2) located on the rear or lower surface of the cover base (CB), which will be described later, can prevent damage to the second camera actuator (1200) in terms of impact reliability and reduce friction noise or interference.

[0085] Additionally, a first stopper (ST1) may also be located on the rear or lower surface of the cover base (CB). The first stopper (ST1) may be used to drive the second camera actuator (1200). By driving the second camera actuator (1200), the lens assembly (1222) may first collide with the first stopper (ST1) and then collide with the second stopper (ST2). According to one embodiment, the step difference between the first stopper (ST1) and the second stopper (ST2) may be about 40 to 100 μm.

[0086] According to one embodiment, in addition to the first stopper (ST1) and the second stopper (ST2), a third stopper (ST3) and a fourth stopper (ST4) may be disposed inside the housing (1210). The third stopper (ST3) and the fourth stopper (ST4) may be disposed at one end inside the housing (1210). The third stopper (ST3) may be used to drive the second camera actuator (1200) just like the first stopper (ST1), and the fourth stopper (ST4) may be used to prevent damage to the second camera actuator (1200) in terms of impact reliability and to reduce friction noise or interference, just like the second stopper (ST2).

[0087] The lens unit (1220) may be located within a shield can. Additionally, the lens unit (1220) may be located within a housing (1210). The lens unit (1220) may move along a third direction (Z-axis direction or optical axis direction). Accordingly, the aforementioned AF function or zoom function may be performed.

[0088] Specifically, the lens portion (1220) may include a lens group (1221) and a lens assembly (1222). The lens group (1221) may include at least one lens. The lens group (1221) may also be multiple, but the following description is based on an embodiment including a single lens group.

[0089] The lens group (1221) can be combined with the lens assembly (1222). The lens group (1221) can be moved in a third direction (Z-axis direction), which is the optical axis direction, by the electromagnetic force generated from the magnet (1252) combined with the lens assembly (1222). At least one of magnification adjustment, focus adjustment, or auto-focusing can be performed by the movement of the lens group (1221) and the lens assembly (1222). The lens assembly (1222) can move along the optical axis direction (Z-axis direction) within the housing (1210) and can be used interchangeably as a moving assembly. Also, the lens assembly (1222) can be combined with the lens group (1221) by various methods.

[0090] The lens assembly (1222) may be configured to surround the lens group (1221). The lens assembly (1222) may include an opening area so that the lens group (1221) can receive light. Additionally, the lens assembly (1222) may include a groove on its side and may be coupled with the magnet (1252) through the groove. A yoke portion (1253) and a coupling member, etc., may be further disposed in the groove for coupling with the magnet (1252). The yoke portion (1253) may surround at least a portion of the side of the magnet (1252). The yoke portion (1253) may be formed in various structures that surround the inner surface and a portion of the side of the magnet (1252). The yoke portion (1253) may also be composed of a divided member, but is not limited thereto. The magnet (1252) is described in the description of the driving unit.

[0091] A plurality of ball guides may be further disposed on the side of the lens assembly (1222) combined with the magnet (1252). The plurality of ball guides may be disposed on one side of the outside of the lens assembly (1222). Some of the plurality of ball guides may be disposed on one side centered on the magnet (1252), and the remaining portion may be disposed on the other side. The plurality of ball guides may be disposed on both sides centered on the magnet (1252). The plurality of ball guides may be a first ball guide (1260), a second ball guide (1270), and a third ball guide (1280). Each ball guide (1260, 1270, 1280) may be configured to include a ball (1262, 1272, 1282) and a recess (1261, 1271, 1281). Each ball (1262, 1272, 1282) may rotate or slide in the recess (1261, 1271, 1281) in which the ball (1262, 1272, 1282) is placed. The size of the recess (1261, 1271, 1281) may vary depending on whether the ball rotates or slides. The depth of the recess (1261, 1271, 1281) may be smaller than the diameter of the ball (1262, 1272, 1282). The length of one side of the recess (1261, 1271, 1281) may be greater than or equal to the length of the other side. The length of the shorter side of the recess (1261, 1271, 1281) may be equal to or slightly larger than the diameter. The shape of the recess (1261, 1271, 1281) is 'V', 'U', ' ', ' or they may be modified shapes. The first ball guide portion (1260), the second ball guide portion (1270), and the third ball guide portion (1280) may all have the same shape, but are not limited thereto.

[0092] Additionally, the lens assembly (1222) may have elastic members (not shown) attached to its upper and rear ends. For example, a first elastic member (not shown) may be attached to the upper surface of the lens assembly (1222). A second elastic member (not shown) may be attached to the lower surface of the lens assembly (1222). Accordingly, the lens assembly (1222) may be supported by the elastic members while moving in a third direction (Z-axis direction). The elastic members (not shown) may be composed of various elastic elements, such as leaf springs. Meanwhile, the elastic members are not limited to the positions described above and may be placed at various positions.

[0093] In this embodiment, the driving unit (1250) (or optical driving unit) may provide a driving force to move the lens assembly (1222) along the optical axis direction. The driving unit (1250) may be configured to include the aforementioned coil (1251) (or driving coil) and magnet (1252) (or driving magnet). The coil (1251) and the magnet (1252) may be arranged to face each other (or correspond to each other). The lens assembly (1222) and the lens unit (1221) may move in a third direction (Z-axis direction) by the electromagnetic force formed between the coil (1251) and the magnet (1252).

[0094] As described above, the coil (1251) may consist of a single coil, but may also consist of multiple sub-coils. In an embodiment, when the coil (1251) includes a first sub-coil and a second sub-coil, the first sub-coil and the second sub-coil may be arranged sequentially in the direction of the optical axis. Additionally, the first sub-coil and the second sub-coil may be arranged spaced apart from each other in the direction of the optical axis. The first sub-coil and the second sub-coil may be connected in parallel with each other. For example, either one end or the other end of the first sub-coil may be connected to one node with either one end or the other end of the second sub-coil. And the other end of the first sub-coil may be connected to another node with the other end of the second sub-coil. That is, the current applied to the first sub-coil and the second sub-coil may be distributed to each sub-coil. Thus, the first sub-coil and the second sub-coil are electrically connected in parallel, and heat generation may be reduced.

[0095] The coil (1251) can be placed in a hole formed on the side of the housing (1210). The coil (1251) can be electrically connected to the substrate (1230) to receive current, etc. through the substrate (1230). The coil (1251) can be coupled to the substrate (1230) through a yoke, etc.

[0096] According to one embodiment, the coil (1251) may be a fixed element together with the substrate portion (1230). Alternatively, the magnet (1252) may be a movable element that moves in the optical axis direction (Z-axis direction) together with the lens assembly (1222), but is not limited thereto.

[0097] According to one embodiment, the driving unit (1250) may further include a Hall sensor unit. The Hall sensor unit includes at least one Hall sensor and may be located inside or outside the coil (1251).

[0098] The magnet (1252) may be positioned to face the coil (1251) as described above. If the coil (1251) includes a plurality of sub-coils, the magnet (1252) may face the plurality of sub-coils. The magnet (1252) may have a structure in which the N pole / S pole or S pole / N pole is sequentially arranged along the optical axis direction. The magnet (1252) may be placed in the groove described above of the lens assembly (1222) and may be positioned to correspond to the coil (1251). The magnet (1252) may be combined with the lens assembly (or moving assembly) together with the yoke.

[0099] The magnet (1252) may have a first pole on a first surface facing the coil (1251) and a second pole on a second surface opposite to the first surface. The first pole may be either the N pole or the S pole, and the second pole may be the other of the N pole and the S pole.

[0100] Magnet guide portions (1291, 1292, 1293, 1294) may be further positioned on the edge of the magnet (1252). The magnet guide portions (1291, 1292, 1293, 1294) may protrude from one side of the lens assembly (1222) to guide the assembly of the magnet (1252). The shape of the magnet guide portions (1291, 1292, 1293, 1294) may be an L-shape, an L-shape, or a modified shape thereof. The height of the magnet guide portions (1291, 1292, 1293, 1294) from one side of the lens assembly (1222) may be lower than the height of the ball included in the ball guide portion. Additionally, the height of the magnet guide portions (1291, 1292, 1293, 1294) may be higher than the lower surface of the yoke portion (1253) described above and lower than the height. The magnet guide portions (1291, 1292, 1293, 1294) may overlap with the yoke portion (1253) in a first direction (a direction perpendicular to the optical axis direction).

[0101] The image sensor may be located on the inside or outside of the second camera actuator. For example, the image sensor may be located on a circuit board located on the inside or outside of the second camera actuator. The image sensor may be located on an optical axis. The image sensor may receive light and convert the received light into an electrical signal. Additionally, the image sensor may be configured with a plurality of pixels in an array form.

[0102] The substrate portion (1230) can come into contact with the side of the housing (1210).

[0103] FIGS. 6a and 6b are cross-sectional views of a second camera actuator according to the movement of a lens assembly according to an embodiment of the present invention.

[0104] Specifically, the cross-sectional view of the second camera actuator disclosed in FIG. 6a and FIG. 6b is a cross-sectional view of the second camera actuator cut at DD' in FIG. 4.

[0105] Referring to FIG. 6a, the lens assembly (1222) can be moved by the driving unit in the direction of incident light to be positioned as close as possible to the first stopper (ST1) located on the rear or lower surface of the cover base (CB). That is, when the lens assembly (1222) moves as far as possible in the direction of incident light, the lens assembly (1222) may first collide with the first stopper (ST1). The first stopper (ST1) may be a stopper for stopping the driving of the second camera actuator (1200). In the present invention, in addition to the first stopper (ST1), a second stopper (ST2) may be further disposed on the rear or lower surface of the cover base (CB). The lens assembly (1222) may collide with the second stopper (ST2) immediately after colliding with the first stopper (ST1). The second stopper (ST2) prevents damage to the second camera actuator (1200) in terms of impact reliability and can reduce friction noise or interference. According to one embodiment, the step difference between the first stopper (ST1) and the second stopper (ST2) may be about 40 to 100 μm.

[0106] Conversely, referring to FIG. 6b, the lens assembly (1222) may be moved by the driving unit in a direction opposite to the direction of incident light and positioned as close as possible to the third stopper (ST3). The third stopper (ST3) may be placed at one end within the housing. Specifically, the third stopper (ST3) may be placed at the part of the end within the housing that first collides when the lens assembly (1222) moves in a direction opposite to the direction of incident light. The third stopper (ST3), like the first stopper (ST1), may also be a stopper for stopping the driving of the second camera actuator (1200). The present invention may further include a fourth stopper (ST4). The fourth stopper (ST4), like the third stopper (ST3), may be placed at one end within the housing. The lens assembly (1222) may collide with the fourth stopper (ST4) immediately after colliding with the third stopper (ST3). The fourth stopper (ST4), like the second stopper (ST2), prevents damage to the second camera actuator (1200) in terms of impact reliability and can reduce friction noise or interference. According to one embodiment, the step difference between the third stopper (ST3) and the fourth stopper (ST4) may be about 40 to 100 μm.

[0107] By means of the first stopper (ST1) and the third stopper (ST3), the impact on the movement of the lens assembly (1222) can be reduced. In addition, the reliability of the lens assembly (1222) and the reliability of the lens group can be improved. Furthermore, the range of movement of the lens assembly (1222) is limited, so that accurate magnification and the like can be achieved.

[0108] FIG. 7 is a front view of a second camera actuator according to one embodiment of the present invention.

[0109] Referring to FIG. 7, the housing (1210) of the second camera actuator may include ribs (710, 720). The ribs (710, 720) may be located on the opposite side of the surface where the ball guide portion located in the lens assembly (1222) is positioned. The ribs (710, 720) may correspond to both edges of one side of the lens assembly (1222). The shape of the ribs (710, 720) may be '┓' and / or '┛'.

[0110] The ribs (710, 720) may be intended to prevent the lens assembly (1222) from escaping from the housing (1210) and to minimize shaking caused by the movement of the lens assembly (1222) to reduce impact. If the ribs are located in the middle part (730, 740) of the housing (1210), they may prevent the lens assembly (1222) from escaping from the housing (1210), but the ribs themselves may be subjected to impact and may break or shatter, and there may also be a risk of flare occurring due to the ribs.

[0111] FIGS. 8a to 8d are side views of a lens assembly in which a ball guide portion is arranged in a second camera actuator according to various embodiments of the present invention.

[0112] As partially described in FIG. 5, the ball guide portion may be located on one side outside the lens assembly. According to the present invention, there may be a total of three ball guide portions disposed on one side outside the lens assembly. The three ball guide portions may be referred to as the first ball guide portion (1260), the second ball guide portion (1270), and the third ball guide portion (1280). A magnet may be further disposed on one side outside the lens assembly, and the ball guide portions may be divided and disposed around the magnet. Specifically, the first and second ball guide portions may be disposed on one side of the magnet, and the third ball guide portion may be disposed on the other side of the magnet. That is, the first and second ball guide portions and the third ball guide portion may be disposed to be located on opposite sides of the magnet.

[0113] According to one embodiment, each ball guide may be configured to include a ball and a recess. The ball may roll or slide in the recess. The size of the recess may vary depending on whether the ball rolls or slides. For example, the size of the recess where the ball rolls may be larger than the size of the recess where the ball slides.

[0114] Hereinafter, various embodiments of the first to third ball guide portions disposed on one side outside the lens assembly will be described in detail.

[0115] Referring to FIG. 8a, the first ball guide portion (1260) may be configured to include a first recess (1261) and a first ball (1262). The first ball (1262) may rotate in the first recess (1261). The first recess (1261) may have a shape in which a part of the side of the lens assembly is recessed. The shape of the first recess (1261) may be 'V', 'U', ' ', ' It may be a modified shape of or. The length of one side of the first recess (1261) may be shorter than the length of the other side. The length of one side of the first recess (1261) may be equal to or slightly larger than the diameter of the first ball (1262). The length of the other side of the first recess (1261) may be half the distance the lens assembly travels. Also, the depth of the first recess (1261) may be smaller than the diameter of the first ball (1262).

[0116] The second ball guide portion (1270) may be configured to include a second recess (1271) and a second ball (1272). The second ball (1272) may also rotate in the second recess (1271). The second recess (1271) may also have a shape in which a part of the side of the lens assembly is recessed. The shape of the second recess (1271) may also be 'V', 'U', ' ', ' It may be a modified shape of or. The length of one side of the second recess (1271) may be shorter than the length of the other side. The length of one side of the second recess (1271) may be equal to or slightly larger than the diameter of the second ball (1272). The length of the other side of the second recess (1271) may be half the distance the lens assembly travels. Also, the depth of the second recess (1271) may be smaller than the diameter of the second ball (1272).

[0117] The second ball guide portion (1270) may have the same shape as the first ball guide portion (1260), but is not limited thereto.

[0118] The third ball guide portion (1280) may be configured to include a third recess (1281) and a third ball (1282). The third ball (1282) may also rotate in the third recess (1281). The third recess (1281) may also have a shape in which a part of the side of the lens assembly is recessed. The shape of the third recess (1281) may also be 'V', 'U', ' ', ' Or they may be modified shapes. The length of one side of the third recess (1281) may be shorter than the length of the other side. The length of one side of the third recess (1281) may be equal to or slightly larger than the diameter of the third ball (1282). The length of the other side of the third recess (1281) may be half the distance the lens assembly travels. Also, the depth of the third recess (1281) may be smaller than the diameter of the third ball (1282).

[0119] The third ball guide portion (1280) may have the same shape as either the first ball guide portion (1260) or the second ball guide portion (1270), but is not limited thereto. According to one embodiment, the first ball guide portion (1260) to the third ball guide portion (1280) may all have the same shape.

[0120] Referring to FIG. 8b, the first ball guide portion (1260) may be configured to include a first recess (1261) and a first ball (1262). The first ball (1262) may slide in the first recess (1261). The first recess (1261) may have a shape in which a part of the side of the lens assembly is recessed. The shape of the first recess (1261) may be 'V', 'U', ' ', ' Or they may be modified shapes. The length of one side and the length of the other side of the first recess (1261) may be equal to or slightly larger than the diameter of the first ball (1262). The length of one side of the first recess (1261) may be equal to the length of the other side, but is not limited thereto. Also, the depth of the first recess (1261) may be smaller than the diameter of the first ball (1262).

[0121] The second ball guide portion (1270) may be configured to include a second recess (1271) and a second ball (1272). The second ball (1272) may also slide in the second recess (1271). The second recess (1271) may also have a shape in which a part of the side of the lens assembly is recessed. The shape of the second recess (1271) may also be 'V', 'U', ' ', ' Or they may be modified shapes. The length of one side and the length of the other side of the second recess (1271) may be equal to or slightly larger than the diameter of the second ball (1272). The length of one side of the second recess (1271) may be equal to the length of the other side, but is not limited thereto. Also, the depth of the second recess (1271) may be smaller than the diameter of the second ball (1272).

[0122] The second ball guide portion (1270) may have the same shape as the first ball guide portion (1260), but is not limited thereto.

[0123] The third ball guide portion (1280) may be configured to include a third recess (1281) and a third ball (1282). The third ball (1282) may also slide in the third recess (1281). The third recess (1281) may also have a shape in which a part of the side of the lens assembly is recessed. The shape of the third recess (1281) may also be 'V', 'U', ' ', ' Or they may be modified shapes. The length of one side and the length of the other side of the third recess (1281) may be equal to or slightly larger than the diameter of the third ball (1282). The length of one side of the third recess (1281) may be equal to the length of the other side, but is not limited thereto. Also, the depth of the third recess (1281) may be smaller than the diameter of the third ball (1282).

[0124] The third ball guide portion (1280) may have the same shape as either the first ball guide portion (1260) or the second ball guide portion (1270), but is not limited thereto. According to one embodiment, the first ball guide portion (1260) to the third ball guide portion (1280) may all have the same shape.

[0125] Referring to FIG. 8c, the ball in one of the first ball guide section (1260) to the third ball guide section (1280) can slide, and the balls in the other two ball guide sections can rotate. FIG. 8c describes the ball in the third ball guide section (1280) sliding, but it does not limit the ball in the first ball guide section (1260) to sliding or the ball in the second ball guide section (1270) to sliding.

[0126] Specifically, the first ball guide section (1260) may be configured to include a first recess (1261) and a first ball (1262), and the second ball guide section (1270) may be configured to include a second recess (1271) and a second ball (1272). The first ball guide section (1260) and the second ball guide section (1270) are identical or similar to those described in FIG. 8a, so a detailed description thereof may be omitted.

[0127] The second ball guide section (1270) may be configured to be identical or similar to the first ball guide section (1260), but is not limited thereto.

[0128] The third ball guide portion (1280) may be configured to include a third recess (1281) and a third ball (1282). The third ball guide portion (1280) is identical or similar to that described in FIG. 8b, so a detailed description thereof may be omitted.

[0129] Referring to FIG. 8d, the ball of one of the first ball guide section (1260) to the third ball guide section (1280) can rotate, and the balls of the other two ball guide sections can slide. FIG. 8d describes the ball of the third ball guide section (1280) rotating, but it does not limit the rotation of the ball of the first ball guide section (1260) or the rotation of the ball of the second ball guide section (1270).

[0130] Specifically, the first ball guide section (1260) may be configured to include a first recess (1261) and a first ball (1262), and the second ball guide section (1270) may be configured to include a second recess (1271) and a second ball (1272). The first ball guide section (1260) and the second ball guide section (1270) are identical or similar to those described in FIG. 8b, so a detailed description thereof may be omitted.

[0131] The second ball guide section (1270) may be configured to be identical or similar to the first ball guide section (1260), but is not limited thereto.

[0132] The third ball guide portion (1280) may be configured to include a third recess (1281) and a third ball (1282). The third ball guide portion (1280) is identical or similar to that described in FIG. 8a, so a detailed description thereof may be omitted.

[0133] According to one embodiment, when the ball of the ball guide rotates, the dynamic tilt and / or decenter of the lens can be improved compared to when the ball slides. On the other hand, when the ball of the ball guide slides, the friction force is reduced compared to when the ball rotates, so there may be an advantage in the driving margin. Therefore, the ball guide can be selected by considering the dynamic tilt of the lens, decenter control, and the driving force of the camera actuator.

[0134] FIG. 9 is a perspective view of a mobile terminal with a camera module applied according to an embodiment.

[0135] As illustrated in FIG. 9, the mobile terminal (1500) of the embodiment may include a camera module (1000), a flash module (1530), and an autofocus device (1510) provided on the rear.

[0136] The camera module (1000) may include an image capturing function and an autofocus function. For example, the camera module (1000) may include an autofocus function using an image. The camera module (1000) may process still image or video image frames obtained by an image sensor in a shooting mode or a video call mode. The processed image frames may be displayed on a predetermined display unit and may be stored in memory.

[0137] In addition, a camera (not shown) may also be placed on the front of the mobile terminal body.

[0138] According to one embodiment, the camera module (1000) may include a first camera module (1000A) and a second camera module (1000B), and OIS may be implemented along with AF or zoom functions by the first camera module (1000A).

[0139] The flash module (1530) may include a light-emitting element that emits light inside. The flash module (1530) may be operated by the operation of the camera of the mobile terminal or by the control of the user.

[0140] The autofocus device (1510) may include one of the packages of surface light-emitting laser elements as a light-emitting part.

[0141] The autofocus device (1510) may include an autofocus function using a laser. The autofocus device (1510) may be mainly used in conditions where the autofocus function using the image of the camera module (1000) is degraded, such as in close proximity of 10m or less or in a dark environment.

[0142] The autofocus device (1510) may include a light-emitting part comprising a vertical cavity surface-emitting laser (VCSEL) semiconductor device and a light-receiving part that converts light energy into electrical energy, such as a photodiode.

[0143] FIG. 10 is a perspective view of a vehicle with a camera module applied according to an embodiment.

[0144] For example, FIG. 10 is an exterior view of a vehicle equipped with a vehicle driving assistance device having a camera module (1000) according to an embodiment.

[0145] Referring to FIG. 10, the vehicle (700) of the embodiment may be equipped with wheels (13FL, 13RL) that rotate by a power source and a certain sensor. The sensor may be a camera sensor (2000), but is not limited thereto.

[0146] The camera sensor (2000) may be a camera sensor to which the camera module (1000) according to the embodiment is applied. The vehicle (700) of the embodiment may acquire image information through the camera sensor (2000) that captures a front image or a surrounding image, and may determine a situation where a lane is not identified using the image information and generate a virtual lane when it is not identified.

[0147] For example, a camera sensor (2000) captures the front of a vehicle (700) to obtain a front image, and a processor (not shown) can obtain image information by analyzing objects included in the front image.

[0148] For example, if objects such as a median strip, curb, or roadside tree corresponding to a lane, adjacent vehicle, driving obstruction, and indirect road marking are captured in an image captured by a camera sensor (2000), the processor can detect these objects and include them in the image information. At this time, the processor can obtain distance information with respect to the objects detected through the camera sensor (2000) to further supplement the image information.

[0149] The image information may be information about an object captured in the image. Such a camera sensor (2000) may include an image sensor and an image processing module.

[0150] The camera sensor (2000) can process still images or videos obtained by an image sensor (e.g., CMOS or CCD).

[0151] The image processing module can process still images or videos acquired through an image sensor to extract necessary information and transmit the extracted information to a processor.

[0152] At this time, the camera sensor (2000) may include a stereo camera to improve the measurement accuracy of the object and to obtain more information such as the distance between the vehicle (700) and the object, but is not limited thereto.

[0153] Although the invention has been described above with reference to embodiments, this is merely illustrative and does not limit the invention. Those skilled in the art will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the embodiments. For example, each component specifically shown in the embodiments may be modified and implemented. Furthermore, differences related to such modifications and applications should be interpreted as being included within the scope of the invention as defined in the appended claims.

Claims

1. Housing; A lens assembly that moves in the direction of the optical axis, including at least one lens within the housing; First to third ball guide portions disposed on one side of the outer side of the lens assembly; and A driving unit for moving the above lens assembly; including, Each of the first to third ball guide sections is configured so that the ball moves in each recess, and The above driving unit is a camera actuator that moves the lens assembly together with the balls included in the first to third ball guide units.

2. In Paragraph 1, The above driving unit is, It includes a magnet disposed on one side of the outer side of the lens assembly and a coil disposed on the inner side of the housing, A camera actuator, wherein the third ball guide portion is positioned to face the first ball guide portion and the second ball guide portion with the magnet as the center.

3. In Paragraph 2, A camera actuator configured such that the first to third ball guide portions allow the ball to rotate and move on each recess.

4. In Paragraph 2, A camera actuator configured such that the first to third ball guide portions allow the ball to slide and move on each recess.

5. In Paragraph 2, A camera actuator, wherein one of the first to third ball guide portions is configured to allow the ball to rotate and move on the recess, and the other two are configured to allow the ball to slide and move on the recess.

6. In Paragraph 2, A camera actuator, wherein one of the first to third ball guide portions is configured to allow the ball to slide and move on the recess, and the other two are configured to allow the ball to rotate and move on the recess.

7. In Paragraph 2, A camera actuator further comprising a magnet guide portion capable of guiding the assembly of the magnet on one side of the lens assembly.

8. In Paragraph 7, The above-mentioned magnet guide portion is a camera actuator having the shape of 'ㄱ' or 'ㄴ'.

9. In Paragraph 7, A camera actuator in which the height of the magnet guide portion from one side of the lens assembly is lower than the height of the balls included in the first to third ball guide portions.

10. Camera actuator; Zoom module; Circuit board and Includes brackets, The above camera actuator is, Housing; A lens assembly that moves in the direction of the optical axis, including at least one lens within the housing; First to third ball guide portions disposed on one side of the outer side of the lens assembly; and A driving unit for moving the above lens assembly; including, Each of the first to third ball guide sections is configured so that the ball moves in each recess, and A camera module in which the above driving unit moves the lens assembly together with the balls included in the first to third ball guide units.

Images