Camera actuator and camera module including same

Abstract

A camera actuator according to an embodiment of the invention comprises: a housing having a coil seating part; a lens assembly which is disposed in the housing and moves in the optical axis direction; first and second ball members disposed between the housing and the lens assembly and spaced apart from each other in the optical axis direction; a magnet coupled to one side of the lens assembly; a coil part disposed in the coil seating part and facing the magnet in a second direction orthogonal to the optical axis direction; a substrate part disposed outside the coil part; and a yoke disposed outside the coil part, wherein the yoke includes a first portion adjacent to the first ball member and a second portion adjacent to the second ball member, and the thickness of the first portion in the second direction may be greater than the thickness of the second portion.

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] Camera modules perform the function of capturing subjects and saving them as images or videos, and are installed in various devices such as mobile terminals like mobile phones, laptops, drones, and vehicles.

[0003] Generally, the device described above is equipped with a miniature camera module, and the camera module can perform an autofocus (AF) function that aligns the focal length of the lens by automatically adjusting the distance between the image sensor and the lens. In addition, the camera module can perform a zooming function of zooming up or zooming out by increasing or decreasing the magnification of a distant subject through a zoom lens.

[0004] In addition, the camera module employs image stabilization (IS) technology to correct or prevent image shaking caused by camera movement resulting from unstable mounting devices or user movements.

[0005] Such image stabilization (IS) technologies include optical image stabilizer (OIS) technology and image stabilization technology using image sensors. Here, OIS technology is a technology that corrects motion by changing the path of light, while image stabilization technology using image sensors corrects motion through mechanical and electronic methods, and OIS technology is being adopted more frequently recently. The camera module may include a reflective member, a driving unit, etc., capable of changing the path of light to implement the OIS function. Specifically, the camera module can change the path of light by controlling the position of the reflective member using a driving force applied from the driving unit. The position of the reflective member can be controlled using a VCM (Voice Coil Motor) type driving unit that includes a coil, a magnet, etc., as such a driving unit.

[0006] Meanwhile, an actuator may be used to provide autofocus or zooming functions in a camera module. For example, the actuator may include a magnet, a coil, a ball member, etc., and may control the position of the lens using a driving force generated by electromagnetic force. However, when the lens is moved by the mechanical movement of the actuator, frictional torque is generated between the ball member and the actuator. This frictional torque may cause wear on the components, and assembly tolerances may occur due to the wear on the components, which can lead to problems such as reduced reliability of the actuator.

[0007] In addition, depending on the number of ball members placed in the housing and the camera actuator, the contact force generated between the actuator and the housing may not be constant, leading to a problem where unnecessary ball members must be placed for stability.

[0008] One of the technical problems of the present invention is to provide a camera actuator that can improve the reliability of the actuator while minimizing the number of ball members.

[0009] Another technical objective of the present invention is to provide a camera actuator and a camera module capable of reducing friction caused by the mechanical movement of the actuator.

[0010] A camera actuator according to an embodiment of the invention comprises a housing having a coil mounting portion, a lens assembly disposed within the housing and moving in the direction of an optical axis, first and second ball members disposed between the housing and the lens assembly and spaced apart in the direction of the optical axis, a magnet coupled to one side of the lens assembly, a coil portion disposed in the coil mounting portion and facing the magnet in a second direction orthogonal to the direction of the optical axis, a substrate portion disposed outside the coil portion, and a yoke disposed outside the coil portion, wherein the yoke comprises a first portion adjacent to the first ball member and a second portion adjacent to the second ball member, and the thickness of the first portion in the second direction may be greater than the thickness of the second portion.

[0011] In addition, the first part may protrude outwardly from the housing.

[0012] Additionally, the first portion may protrude in the direction of the substrate portion, and the substrate portion may include a groove in which the first portion is received.

[0013] Additionally, the lens assembly includes a first guide groove and a second guide groove in which the first and second ball members are respectively received, and the housing includes a first guide surface and a second guide surface that contact the first and second ball members, and the first guide surface and the second guide surface correspond to the first guide groove and the second guide groove respectively, and the first ball member is disposed in a plurality between the first guide surface and the first guide groove, and the second ball member can be disposed in one or more between the second guide surface and the first guide groove.

[0014] Additionally, the first part is positioned adjacent to the first guide groove, and the second part is positioned adjacent to the second guide groove, and the center of the adhesion force applied to the plurality of first and second ball members by the yoke and the magnet may be closer to the first guide groove than to the second guide groove.

[0015] A camera actuator according to another embodiment comprises a housing and a plurality of lens assemblies disposed within the housing, and a plurality of ball members disposed between the housing and the lens assemblies. The lens assemblies include a lens holder portion on which a lens is mounted, an extension portion extending from the lens holder portion and on which a magnet is disposed, a first guide portion disposed along one side of the magnet on the extension portion, and a second guide portion disposed along the other side of the magnet on the extension portion. The first and second guide portions have concave guide grooves facing inward from the outside, and the ball members are disposed in the guide grooves. The first and second guide portions may include a magnetic material.

[0016] In addition, the first and second guide portions may be extended parallel to the optical axis passing through the center of the lens.

[0017] In addition, it may further include an adhesive disposed between the first and second guide parts and the extension part, respectively.

[0018] Additionally, the extension part has a plurality of fixed ribs, and the adhesive may be disposed between the first and second guide parts and the fixed ribs.

[0019] Additionally, the extension portion may have a step formed at a position in contact with the first and second guide portions, the first and second guide portions may be formed to correspond to the shape of the step, and an adhesive member may be disposed between the extension portion and the first and second guide portions.

[0020] According to the camera actuator of the embodiment, the driving reliability of the camera actuator can be improved even when the ball member is arranged in a minimal manner.

[0021] In addition, according to the camera actuator of the embodiment of the invention, friction caused by the mechanical movement of the actuator can be reduced.

[0022] In addition, the shape of the actuator can be simplified, which can simplify the injection molding process.

[0023] FIG. 1 is an exploded perspective view of the housing and lens assembly of a camera module according to a first embodiment.

[0024] Figure 2 is a cross-sectional view of A-A' in Figure 1.

[0025] FIG. 3 is a perspective view of a housing accommodating the first, second, and third lens assemblies.

[0026] Figure 4 illustrates the housing of a camera module.

[0027] Figure 5 is a cross-sectional view of B-B' in Figure 4.

[0028] FIG. 6 is an exploded perspective view of the first and second lens assemblies of a camera actuator according to the first embodiment.

[0029] Figure 7 is a cross-sectional view of F-F' in Figure 3.

[0030] Figure 8 is an enlarged view of the O area of ​​Figure 7.

[0031] FIG. 9 shows a first variation of the first embodiment.

[0032] FIG. 10 is a perspective view of a yoke according to a first embodiment.

[0033] FIG. 11 is a top view of a yoke according to a first embodiment.

[0034] FIG. 12 shows the arrangement relationship of a ball member, a magnet, and a yoke according to a first embodiment.

[0035] FIG. 13 shows another arrangement relationship of the ball member, magnet, and yoke according to the first embodiment.

[0036] FIG. 14 is an exploded perspective view of the second and third lens assemblies of a camera actuator according to the second embodiment.

[0037] FIG. 15 is a perspective view of a third lens assembly according to a second embodiment.

[0038] Figure 16 is a cross-sectional view taken along C-C' of Figure 15.

[0039] FIG. 17 is a cross-sectional view of FIG. 15 according to a first variation of the second embodiment.

[0040] FIG. 18 is a cross-sectional view of FIG. 15 according to a second variation of the second embodiment.

[0041] FIG. 19 is a cross-sectional view of FIG. 15 according to the second embodiment and the third variation.

[0042] FIG. 20 is a cross-sectional view of FIG. 15 according to a fourth variation of the second embodiment.

[0043] FIG. 21 briefly illustrates the manufacturing process of the guide portion of the third lens assembly of the second embodiment.

[0044] FIG. 22 is a drawing illustrating an example of a mobile terminal with a camera module applied according to an embodiment.

[0045] FIG. 23 is an example of a plan view of a vehicle to which a camera module or optical system according to an embodiment of the invention is applied.

[0046] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the attached drawings. 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. Furthermore, terms used in the embodiments of the present invention (including technical and scientific terms) may be interpreted in a meaning generally understood by those skilled in the art to which the present invention belongs, unless explicitly and specifically defined otherwise. Terms used generally, such as those 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 intended to describe the embodiments and are not intended to limit the present invention. 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. Additionally, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc., may be used. These terms are intended only to distinguish the component from other components and are not to limit the essence, order, or sequence of the component. Furthermore, when 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.

[0048] 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.

[0049] In addition, prior to describing the embodiments of the invention, 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. And 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 second lens assembly (1200) below, the optical axis direction is the third direction (Z-axis direction), and the description below is based on this. In addition, the term "outer direction" may mean the direction outside the housing of the camera module, and the term "inner direction" may mean the direction inside the housing of the camera module.

[0050]

[0051] FIG. 1 is an exploded perspective view of a housing and a lens assembly of a camera module according to a first embodiment, FIG. 2 is a cross-sectional view taken along A-A' of FIG. 1, FIG. 3 is a perspective view of a housing that accommodates the first, second, and third lens assemblies, FIG. 4 shows the housing of the camera module, and FIG. 5 is a cross-sectional view taken along B-B' of FIG. 4.

[0052] Referring to FIGS. 1 to 3, a camera module (1000) according to a first embodiment of the present invention may include a case (1400), a first lens assembly (1100), a second lens assembly (1200), a third lens assembly (1300), a reflection module (1600), and a substrate portion (100). Here, the first lens assembly (1100) may be used as a first actuator, the second lens assembly (1200) as a second actuator, and the third lens assembly (1300) as a third actuator.

[0053] The case (1400) can cover the reflection module (1600), the first lens assembly (1100), the second lens assembly (1200), and the third lens assembly (1300). The case (1400) may be made of a material that performs electromagnetic shielding. The case (1400) may be made of a metal material. Accordingly, the first lens assembly (1100), the second lens assembly (1200), and the third lens assembly (1300) within the case (1400) can be easily protected.

[0054] The above case (1400) has a first opening (1401) open on its upper surface, and the first opening (1401) is an area where light is incident on the first lens assembly (1100). The first opening (1401) may overlap with the first lens assembly (1100) in a first direction (X).

[0055] The reflection module (1600) can change the path of light incident on the camera module (10). The reflection module (1600) may be an OIS (Optical Image Stabilizer) actuator. In this case, light incident on the camera module (10) from the outside may first be incident on the reflection module (1600). Additionally, the light incident on the reflection module (1600) may have its path changed and be incident on the first lens assembly (1100). The path of the light may be changed by an optical element (1132). The optical element (1132) may be a prism or a mirror. The optical element (1132) can change the light from a first direction (X-axis direction) to a third direction (Z-axis direction). Additionally, the optical element (1132) can tilt the light with respect to two axes (X and Z axes).

[0056] The first lens assembly (1100) is fixed to the top of the housing (800) so that light reflected from the reflection module (1600) can be incident thereon. The first lens assembly (1100) may be positioned between the reflection module (1600) and the second lens assembly (1200).

[0057] The first lens assembly (1100) may include a fixed focal length lens disposed in a predetermined lens barrel (not shown). The fixed focal length lens may be defined as a “single focal length lens” or a “single layer lens.”

[0058] The second lens assembly (1200) may be positioned at the rear end of the first lens assembly (1100). Here, the rear end of the second lens assembly (1200) is an area adjacent to the image sensor (IS).

[0059] The third lens assembly (1300) may be positioned at the rear end of the second lens assembly (1200). That is, the third lens assembly (1300) is positioned closer to the image sensor (IS) than the second lens assembly (1200).

[0060] The second lens assembly (1200) and the third lens assembly (1300) may be zoom actuators or AF (Auto Focus) actuators. For example, the second lens assembly (1200) and the third lens assembly (1300) may have one or more lenses and may perform an auto-focusing function or a zoom function by moving at least one lens assembly according to a control signal from a predetermined control unit. Additionally, one or more lenses may move independently or individually along the optical axis direction.

[0061] The above substrate portion (100) includes a first substrate (110) disposed at the rear end of the third lens assembly (1300), a second substrate portion (120) disposed outside the first lens assembly and the second lens assembly, and a third substrate portion (130).

[0062] The image sensor (IS) is disposed on the first substrate (110), and the first substrate (110) may be combined with a housing (800) or disposed inside the housing (800).

[0063] The second substrate portion (120) and the third substrate portion (130) may be connected by a bridge (105) to form an integral structure. The second substrate portion (120) and the third substrate portion (130) may be electrically connected to a plurality of coils (310, 320). The first, second, and third substrate portions (110, 120, 130) may include circuit boards having wiring patterns 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).

[0064] Referring to FIGS. 3 to 5, the housing (800) can guide the second lens assembly (1200) and the third lens assembly (1300) to move in a third direction (Z-axis direction) which is the optical axis direction.

[0065] A plurality of coils (310, 320) may be disposed on the outer side of the housing (800). The plurality of coils (310, 320) may provide magnetic force to the first and second magnets (210, 220) attached to the second and third lens assemblies (1200, 1300). The second and third lens assemblies may move in the Z-axis direction by means of the magnetic force. Among the plurality of coils, the first coil (310a, 310b) may be disposed adjacent to the third lens assembly (1300), and among the plurality of coils, the second coil (320a, 320b) may be disposed adjacent to the second lens assembly (1200).

[0066] Specifically, the housing (800) may include a base portion (810) on which the first substrate portion (110) is placed and first and second cover portions (820, 830) extending from both ends of the base portion (810) to face each other, and may include a coil mounting portion (850) connecting the first and second cover portions (820, 830) and on which a plurality of coils are mounted.

[0067] The above coil mounting portion (850) may include a first coil mounting portion (850a), a second coil mounting portion (850b), and a coil support portion (851).

[0068] A guide surface (852, 853) that contacts a ball member (BA) may be formed on the other side of the coil mounting portion (850) where the coil is not mounted. The lens assembly may move along the guide surface (852, 853) in the direction of the optical axis. The guide surface includes a first guide surface (852) and a second guide surface (853), and at least one of the guide surfaces (852, 853) may form a concave recess (853a). The ball member (BA) may be guided along the recess (853a).

[0069] The second substrate portion (120) may be disposed on the outer side of the first coil (310a, 310b), and the third substrate portion (130) may be disposed on the outer side of the second coil (320a, 320b).

[0070] A first yoke (510) may be disposed on the outer side of the second substrate portion (120), and a second yoke (520) may be disposed on the outer side of the third substrate portion (130). The first and second yokes (510, 520) can suppress magnetic forces generated from the outside from affecting the magnet and coil. Additionally, the first and second yokes (510, 520) may each exert an attractive force due to magnetic force with adjacent first and second magnets (210, 220).

[0071] The first yoke (510) can be attached to the outer surface of the second substrate portion (120) with an adhesive. The second yoke (520) can be attached to the outer surface of the third substrate portion (130) with an adhesive.

[0072] FIG. 6 is an exploded perspective view of the second and third lens assemblies of a camera actuator according to the first embodiment, and FIG. 7 is a cross-sectional view of F-F' of FIG. 3.

[0073] The second lens assembly (1200) may include a second lens part (1200a), a second lens holder part (1210), and a second extension part (1220).

[0074] The second lens portion (1200a) may include a plurality of lenses. The second lens portion (1200a) may be mounted on the second lens holder portion (1210). The second lens holder portion (1210) includes the lens hole (LH1), and light may be incident on the second lens portion (1200a) through the lens hole (LH1).

[0075] The second extension part (1220) may have a structure that protrudes from one side of the second lens holder part (1210) and extends in the X and Z axis directions. The second lens holder part (1210) and the second extension part (1220) may be formed integrally. For example, the second lens holder part (1210) and the second extension part (1220) may be injection molded integrally.

[0076] The third lens assembly (1300) may include a third lens part (1300a), a third lens holder part (1310), and a third extension part (1320).

[0077] The third lens portion (1300a) may include a plurality of lenses. The third lens portion (1300a) may be mounted on the third lens holder portion (1310). The third lens holder portion (1310) includes the lens hole (LH2), and light may be incident on the third lens portion (1300a) through the lens hole (LH2).

[0078] The third extension part (1320) may have a structure that protrudes from one side of the third lens holder part (1310) and extends in the X and Z axis directions. The third lens holder part (1310) and the third extension part (1320) may be formed integrally. For example, the third lens holder part (1310) and the third extension part (1320) may be injection molded integrally.

[0079]

[0080] In the following, the detailed configuration of the lens assembly is described based on the third lens assembly (1300), and the second lens assembly (1200) may have the same configuration as the third lens assembly (1300).

[0081] Referring to FIGS. 6 and 7, the third extension (1320) may include a coupling part (1324) to which the magnet (210) is seated and coupled. The coupling part (1324) may include a plurality of ribs protruding outwardly from one side of the third extension (1320).

[0082] In the third extension part (1320), a plurality of guide grooves (1321) in which a ball member (BA) is disposed may be formed at a position corresponding to the guide surface (852, 583) of the housing. For example, the guide grooves (1321) include a first guide groove (1321a) and a second guide groove (1321b), and the first guide groove (1321a) and the second guide groove (1321b) may be formed on both sides with the coupling part (1324) in between where the magnet (210) is disposed.

[0083] The ball member (BA) may be positioned between the first guide groove (1321a) and the first guide surface (852) and between the second guide groove (1321b) and the second guide surface (853).

[0084] FIG. 8 is an enlarged view of the O region of FIG. 7, FIG. 9 shows a first variation of the first embodiment, FIG. 10 is a perspective view of a yoke according to the first embodiment, and FIG. 11 is a top view of a yoke according to the first embodiment.

[0085] Referring to FIGS. 8, 10 and 11, at least a portion of the magnet (210) may be positioned between the first and second ball members (BA1, BA2). The first yoke (510) may overlap with the area between the first and second ball members (BA1, BA2) in a direction orthogonal to the optical axis direction (Z-axis direction) (Y-axis direction).

[0086] The magnet (210), the coil (310), the second substrate part (120), and the first yoke (510) may be arranged to overlap in the second direction (Y-axis direction). The length of the first yoke (510) in the optical axis direction (Z) may be greater than the maximum separation distance of the first ball members (BA1).

[0087] At least one or both of the first and second yokes (510, 520) may have different thicknesses depending on the region. For example, the region of the first yoke (510) has a first part (511) which is a thick region and a second part (512) which is a thin region, and the first part (511) is a region adjacent to the first ball member (BA1) and overlapped with the first magnet (210) in a first direction (Y-axis direction). The first part (511) may be a region overlapped with the region between the first magnet (210) and the first ball member (BA1) in a second direction (Y-axis direction). The second direction (Y-axis direction) is a direction orthogonal to the optical axis direction.

[0088] The second portion (512) is an area adjacent to the second ball member (BA2) and overlapped with the first magnet (210) in the second direction (Y-axis direction). The second portion (512) may be an area overlapped with the area between the first magnet (210) and the second ball member (BA2) in the first direction (Y-axis direction).

[0089] The length of the optical axis direction (Z) of the first part (511) may be greater than the maximum separation distance of the first ball members (BA1). The length of the optical axis direction (Z) of the second part (512) may be greater than the maximum separation distance of the second ball members (BA2). The length of the optical axis direction of the first part (511) may be the same as the length of the optical axis direction of the first yoke (510). As another example, the length of the optical axis direction of the first part (511) may be smaller or larger than the length of the optical axis direction of the first yoke (510).

[0090] The thickness (D1) in the second direction (Y-axis direction) of the first part (511) may be thicker than the thickness (D2) in the second direction (Y-axis direction) of the second part (512). The thickness (D1) of the first part (511) may be at least 1.5 times that of the second part (512), for example, in the range of 1.5 to 2.5 times, and preferably 2 times. The thickness of the second part may be approximately 1 mm ± 0.1 mm, and the thickness of the first part may be approximately 2 mm ± 0.2 mm.

[0091] The X-axis length (L1) of the first part (511) may be in the range of 30% to 60% of the X-axis length of the first yoke (510). The second direction (X) length (L1) of the first part (511) may be the same as the second direction (X) length (L2) of the second part (511). The center between the first part (511) and the second part (511), i.e., the stepped part, may correspond to the center of the first magnet (510).

[0092] The length (L1) of the first direction (X-axis direction) of the first part (511) may be equal to the length (L2) of the first direction (X-axis direction) of the second part (512), but is not limited thereto, and the length (L1) of the first direction (X-axis direction) of the first part (511) may be longer or shorter than the length (L2) of the first direction (X-axis direction) of the second part (512).

[0093] For example, the first part (511) of the first yoke (510) according to the first embodiment may have a step by protruding outward from the housing. As another example, referring to FIG. 9, the first part (511) of the first yoke (510) according to another first embodiment may have a step by protruding inward from the housing. The step is positioned between the first and second parts (511, 512).

[0094] At this time, the second substrate (120) may have a groove (121) in which the first part (511) is seated. As a result, the outer surface of the first yoke (510) may have a flat surface.

[0095] Since the first part (511) and the second part (512) of the first yoke (510) have different thicknesses, the magnitude of the magnetic force applied from the first magnet (210) may differ between the first part (511) and the second part (512).

[0096] The attractive force (F1) applied to the first part (511) by the magnetic force of the first magnet (210) may be greater than the attractive force (F2) applied to the second part (512). As a result, the force of contact between the recess (853a) of the guide part and the ball member (BA), and the force of contact between the ball member (BA) and the first guide groove (1321b) may be increased.

[0097] FIG. 12 shows the arrangement relationship of a ball member, a magnet, and a yoke according to a first embodiment, and FIG. 13 shows another arrangement relationship of a ball member, a magnet, and a yoke according to another first embodiment.

[0098] Referring to FIGS. 8 and FIGS. 12, the third lens assembly (1300) according to the first embodiment may have four ball members (BA1, BA2). The ball members (BA1, BA2) may be disposed in the first guide groove (1321a) and the second guide groove (1321b).

[0099] When an attractive force is applied to the first yoke (510) by the first magnet (210), the first yoke (510) can transmit a force in the Y-axis direction to the substrate (120) and the housing (800). Due to this transmission of force, the guide surfaces (852, 853) of the housing (800) can be in close contact with the ball member (BA).

[0100] Generally, the center of the force applied to the ball member (BA) can act strongly at the first center (C1), which is the center of gravity of the square, when the yoke is formed of a plate with the same thickness.

[0101] However, in the first yoke (510) according to the first embodiment, the thickness of the first part (511) is greater than the thickness of the second part (512), so the attractive force applied to the first part (511) increases, and thus the center of the force applied to the ball member (BA) can be the second center (C2). As the second center (C2) becomes adjacent to the first guide groove (1321a), the contact force between the ball member (BA) placed in the first guide groove (1321a) and the guide surface (853) can be increased.

[0102] Referring to FIG. 13, a third lens assembly (1300) according to another first embodiment may have three ball members (BA). Two ball members (BA1) may be placed in the first guide groove (1321a), and one ball member (BA2) may be placed in the second guide groove (1321b). Although FIG. 13 shows the ball members (BA) placed in the central part of the second guide groove (1321b), they may be placed in the upper or lower part of the second guide groove (1321b), and the position where the ball members (BA2) are placed may vary depending on the number of the second guide grooves (1321b).

[0103] Even if only one ball member (BA2) is placed in the second guide groove (1321b), the third center (C3), which is the center of the force applied to the ball member (BA1) by the first part (511) of the first yoke (510), is placed adjacent to the first guide groove (1321b), so that the phenomenon of unstable operation when the actuator is driven can be prevented.

[0104]

[0105] FIG. 14 is an exploded perspective view of the second and third lens assemblies of a camera actuator according to the second embodiment, FIG. 15 is a perspective view of the third lens assembly according to the second embodiment, and FIG. 16 is a cross-sectional view taken along C-C' of FIG. 15.

[0106] Referring to FIG. 14, the second lens assembly (1200) according to the second embodiment may include a second lens part (1200a), a second lens holder part (1210), and a second extension part (1220).

[0107] The second lens part (1200a) may include a plurality of lenses.

[0108] The second lens part (1200a) may be mounted on the second lens holder part (1210). The second lens holder part (1210) includes the lens hole (LH1), and light may be incident on the second lens part (1200a) through the lens hole (LH1).

[0109] The second extension portion (1220) may have a plane extending in the X and Z axis directions, protruding from one side of the second lens holder portion (1210). The second lens holder portion (1210) and the second extension portion (1220) may be formed integrally. For example, the second lens holder portion (1210) and the second extension portion (1220) may be injection molded integrally.

[0110] The third lens assembly (1300) may include a third lens part (1300a), a third lens holder part (1310), and a third extension part (1320).

[0111] The third lens part (1300a) may include a plurality of lenses.

[0112] The third lens part (1300a) may be mounted on the third lens holder part (1310). The third lens holder part (1310) includes the lens hole (LH2), and light may be incident on the third lens part (1300a) through the lens hole (LH2).

[0113] The third extension portion (1320) may have a plane extending in the X and Z axis directions, protruding from one side of the third lens holder portion (1310). The third lens holder portion (1310) and the third extension portion (1320) may be formed integrally. For example, the third lens holder portion (1310) and the third extension portion (1320) may be injection molded integrally.

[0114] A guide member (910) that guides a ball member may be disposed on the third extension member (1320) above.

[0115] The following description focuses on the third lens assembly (1300) of the second embodiment, and the second lens assembly (1200) may have the same configuration as the third lens assembly (1300), differing only in its placement in the camera module.

[0116] Referring to FIGS. 14 and 15, the surface on which the magnet (210) and the guide (910) are positioned in the third extension (1320) may be a surface parallel to the optical axis.

[0117] The magnet (210) may be mounted on the central portion (1322) of the third extension portion (1320). The third extension portion (1320) may include a protrusion (1323) for seating the magnet (210). The magnet (210) may be attached to the protrusion (1323). A rib (1328) protruding from the third extension portion (1320) may be disposed on the central portion (1322) of the third extension portion (1320). The rib (1328) may have a pattern in which the horizontal and vertical directions are orthogonal. An adhesive member (80) may be filled in the area of ​​the central portion (1322) where the rib (1328) is not formed, and the magnet (210) may be attached.

[0118] A guide section (910) may be attached to the third extension section (1320). Specifically, a first guide section (910a) may be arranged along one side of the central section (1322) to which the magnet (210) is attached, and a second guide section (920a) may be arranged along the other side. In other words, a first guide section may be arranged along one side of the magnet on the outer wall, and a second guide section may be arranged along the other side of the magnet on the outer wall. The first and second guide sections (910a, 910b) may be arranged parallel to the optical axis.

[0119] The guide portion (910) can be attached by the third extension portion (1320) and the adhesive member (80).

[0120] The guide portion (910) may include a plurality of guide grooves (911, 912, 913) that accommodate a plurality of ball members (BA). According to an embodiment, the guide grooves of the guide portion may include a first guide groove (911), a second guide groove (912), and a third guide groove (913). The lengths of the first guide groove (911) and the third guide groove (913) may be the same, and the length of the second guide groove (912) may be shorter than the length of the first guide groove (911). However, not limited thereto, the number of guide grooves and the size and / or depth of the guide grooves may vary.

[0121] According to the embodiment, the first guide portion (910a) may include a plurality of guide grooves (911a, 912a, 913a) in which the ball member (BA) can be received. Additionally, the second guide portion (910b) may include a plurality of guide grooves (911b, 912b, 913b) in which the ball member (BA) can be received. In the embodiment, the ball member (BA) is shown being disposed in the first and third guide grooves (911, 913), but the ball member (BA) may also be disposed in the second guide grooves (912a, 912b). Additionally, at least one of the plurality of ball members (BA) may be disposed in each of the guide grooves (911, 912, 913), or none may be disposed in each.

[0122] The guide portion (910) may be formed from a metal material. For example, the guide portion (910) may include materials such as stainless steel (SUS), aluminum, and steel. Since the guide portion (910) is formed from a metal material, an attractive force due to magnetic force can be generated with the magnet (210). Since the guide portion (910) is formed from a metal material having wear resistance, friction and wear with the ball member (BA) are reduced, thereby increasing the lifespan of the third lens assembly (1300) and improving the reliability of the camera module.

[0123]

[0124] FIG. 17 is a cross-sectional view of FIG. 15 according to a first variation of the second embodiment, FIG. 18 is a cross-sectional view of FIG. 15 according to a second variation of the second embodiment, FIG. 19 is a cross-sectional view of FIG. 15 according to a third variation of the second embodiment, and FIG. 20 is a cross-sectional view of FIG. 15 according to a fourth variation of the second embodiment.

[0125] Referring to FIG. 17, the first and second guide parts (910a, 910b) can be positioned to contact the magnet (210). By positioning the first and second guide parts (910a, 910b) to contact the magnet (210), assembly tolerance between the magnet (210) and the first and second guide parts (910a, 910b) can be avoided.

[0126] Referring to FIG. 18, a step may be formed in the third extension part (1320) to accommodate the first and second guide parts (910a, 910b). Additionally, the first and second guide parts (910a, 910b) may be formed with a step to correspond to the shape of the third extension part (1320). Since the step shape makes it easy to align the assembly, and the contact area increases due to the stepped shape, the adhesive strength between the third extension part (1320) and the first and second guide parts (910a, 910b) by the adhesive member may be improved.

[0127] Referring to FIG. 19, the third extension (1320) may include a guide support (1326) that extends further outward from the end of the third extension (1320). The guide support (1326) can prevent the first and second guide parts (910a, 910b) from being assembled in a left-right direction protruding from the third extension (1320). The guide support (1326) may be formed at an angle outward from the end of the outer wall.

[0128] The first and second guide parts (910a, 910b) may have a shape with one side chamfered so as to correspond to the shape of the guide support part (1326).

[0129] Referring to FIG. 20, the rib (1328) may be formed up to the portion where the first and second guide portions (910a, 910b) are positioned, in addition to the central portion (1322) of the third extension portion (1320).

[0130] The above rib (1328) partitions the adhesive member (80), thereby preventing the adhesive member (80) from being damaged and its adhesive strength reduced by external influences applied to the lens assembly. For example, when the lens assembly is exposed to a humid environment, the adhesive member (80) is partitioned by the rib (1328), so that even if moisture accumulates in one of the grooves, the adhesive member in other parts may not be affected.

[0131]

[0132] FIG. 21 briefly illustrates the manufacturing process of the guide portion of the third lens assembly of the second embodiment.

[0133] Referring to FIG. 21, FIG. 21(a) shows that the third lens holder part (1310) and the third extension part (1320) are integrally injection molded. The third extension part (1320) may have a guide seating part (1328) where the guide part (910) is placed. Additionally, the third extension part (1320) may have a central part (1322) where a magnet is placed and a plurality of protrusions (1323) for the magnet to be seated.

[0134] The guide mounting portion (1329) may have a flat surface, but is not limited thereto, and may have a structure for attaching the guide mounting portion (1329).

[0135] Since the third extension part (1320) above does not include a guide part (910), the injection mold can be simplified.

[0136] FIG. 21(b) shows a process of attaching a guide portion (910a, 910b) without a guide groove to the guide seating portion (1329).

[0137] The above guide portions (910a, 910b) can be attached to the guide seating portion (1329) by an adhesive member (80).

[0138] FIG. 21(c) shows a process of forming guide grooves (911a, 911b, 912a, 912b, 913a, 913b) in the guide portions (910a, 910b).

[0139] The process of machining the above guide groove may include EDM machining (Electrical Discharge Machining), profile machining, etc.

[0140] After the guide portions (910a, 910b) are attached to the magnet seating portion (1320), the guide grooves are machined, thereby eliminating assembly tolerances in the assembly process with the housing (800).

[0141] FIG. 22 is a drawing illustrating an example of a mobile terminal with a camera module applied according to an embodiment.

[0142] Referring to FIG. 22, the mobile terminal (1) may include a camera module (10) provided on the rear. The camera module (10) may include an image capturing function. Additionally, the camera module (10) may include at least one of an auto focus, a zoom function, and an OIS function.

[0143] The camera module (10) can process still images or video frames obtained by the image sensor (190) in shooting mode or video call mode. The processed image frames can be displayed on a display unit (not shown) of the mobile terminal (1) and can be stored in memory (not shown). Additionally, although not shown in the drawing, the camera module may also be placed on the front of the mobile terminal (1).

[0144] For example, the camera module (10) may include a first camera module (10A) and a second camera module (10B). In this case, at least one of the first camera module (10A) and the second camera module (10B) may include the optical system (1000) described above. Accordingly, the camera module (10) may have a slim structure and may have improved distortion and aberration characteristics. In addition, the camera module (10) may have good optical performance at the center and periphery of the field of view (FOV).

[0145] Additionally, the mobile terminal (1) may further include an autofocus device (31). The autofocus device (31) may include an autofocus function using a laser. The autofocus device (31) may be mainly used in conditions where the autofocus function using the image of the camera module (10) disclosed above is degraded, for example, in close proximity of 10m or less or in a dark environment. The autofocus device (31) may include a light-emitting part including a vertical cavity surface-emitting laser (VCSEL) semiconductor element and a light-receiving part that converts light energy into electrical energy, such as a photodiode.

[0146] Additionally, the mobile terminal (1) may further include a flash module (33). The flash module (33) may include a light-emitting element that emits light inside. The flash module (33) may be operated by the operation of the camera of the mobile terminal or by the control of a user.

[0147] FIG. 23 is an example of a plan view of a vehicle to which a camera module or optical system according to an embodiment of the invention is applied. Referring to FIG. 23, a vehicle camera system according to an embodiment of the invention includes an image generation unit (11), a first information generation unit (12), a second information generation unit (21, 22, 23, 24), and a control unit (14). The image generation unit (11) may include at least one camera module disposed in the vehicle and may generate a front image of the vehicle or an interior image of the vehicle by photographing the front of the vehicle and / or the driver. The image generation unit (11) may generate an image of the vehicle's surroundings by photographing the vehicle's surroundings in one or more directions as well as the front of the vehicle using the camera module. Here, the front image and the surrounding image may be digital images and may include color images, black and white images, and infrared images. Additionally, the front image and the surrounding image may include still images and video images. The image generation unit (11) provides the driver image, the front image, and the surrounding image to the control unit (14). Next, the first information generating unit (12) may include at least one radar or / and camera placed on the vehicle and generates first detection information by detecting the front of the vehicle. Specifically, the first information generating unit (12) is placed on the vehicle and generates first detection information by detecting the position and speed of vehicles located in front of the vehicle, the presence and location of pedestrians, etc.

[0148] By using the first detection information generated by the first information generation unit (12), the distance between the vehicle and the vehicle in front can be controlled to be maintained at a constant level, and the stability of vehicle operation can be increased in specific cases that are pre-set, such as when the driver wants to change the driving lane of the vehicle or when reverse parking. The first information generation unit (12) provides the first detection information to the control unit (14). The second information generation unit (21, 22, 23, 24) generates second detection information by detecting each side of the vehicle based on the front image generated by the image generation unit (11) and the first detection information generated by the first information generation unit (12). Specifically, the second information generation unit (21, 22, 23, 24) may include at least one radar or / and camera placed on the vehicle, and can detect the position and speed of vehicles located on the side of the vehicle or capture images. Here, the second information generating unit (21, 22, 23, 24) can be positioned at both front corners, side mirrors, and the rear center and both rear corners of the vehicle, respectively.

[0149] At least one information generating unit among such vehicle camera systems may be equipped with an optical system and a camera module having the same as described in the embodiment(s) disclosed above, and can provide or process information acquired through the front, rear, each side, or corner area of ​​the vehicle to a user to protect the vehicle and objects from autonomous driving or surrounding safety. The optical system of the camera module according to the embodiment of the invention may be mounted in multiple units within the vehicle to comply with safety regulations, enhance autonomous driving functions, and increase convenience. Furthermore, the optical system of the camera module is applied within the vehicle as a component for control such as a Lane Keeping Assistance System (LKAS), Lane Departure Warning System (LDWS), and Driver Monitoring System (DMS). Such vehicle camera modules can achieve stable optical performance even with changes in ambient temperature and provide cost-competitive modules, thereby ensuring the reliability of vehicle components.

[0150]

[0151] Although the above description has focused on the embodiments, this is merely an example and is not intended to limit the embodiments. A person 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 instance, 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 embodiments set forth in the appended claims.

Claims

1. Housing having a coil seating portion; A lens assembly disposed within the above housing and moving in the direction of the optical axis; First and second ball members disposed between the housing and the lens assembly and spaced apart in the direction of the optical axis; A magnet coupled to one side of the above lens assembly; A coil portion disposed on the coil seating portion and facing in a second direction orthogonal to the magnet and the optical axis direction; A substrate portion disposed on the outer side of the above-mentioned coil portion; and It includes a yoke disposed on the outer side of the above-mentioned coil portion; and The above yoke includes a first portion adjacent to the first ball member and a second portion adjacent to the second ball member, and A camera actuator in which the thickness of the first part in the second direction is greater than the thickness of the second part.

2. In Paragraph 1, The first part above is a camera actuator that protrudes outwardly from the housing.

3. In Paragraph 1, The above first part protrudes in the direction of the substrate part, and The above substrate portion is a camera actuator including a groove in which the first portion is received.

4. In any one of paragraphs 1 to 3, The lens assembly includes a first guide groove and a second guide groove in which the first and second ball members are respectively received, and The above housing includes a first guide surface and a second guide surface that contact the first and second ball members, and The first guide surface and the second guide surface correspond to the first guide groove and the second guide groove, respectively, and The first ball member is arranged in plurality between the first guide surface and the first guide groove, and The above second ball member is a camera actuator disposed between the second guide surface and the first guide groove, with one or more members.

5. In Paragraph 4, The first part is positioned adjacent to the first guide groove, and The above second part is positioned adjacent to the above second guide groove, and The center of the adhesion force applied to the plurality of first and second ball members by the yoke and the magnet is a camera actuator that is closer to the first guide groove than to the second guide groove.

6. Housing; and A plurality of lens assemblies disposed within the above housing; It includes a plurality of ball members disposed between the housing and the lens assembly; and The above lens assembly is, Lens holder part where the lens is mounted; An extension portion extending from the above lens holder portion and having a magnet disposed therein; A first guide portion disposed along one side of the magnet on the extension portion; and It includes a second guide portion disposed along the other side of the magnet on the extension portion, The first and second guide portions above have a concave guide groove extending from the outside toward the inside, The ball member is disposed in the guide groove above, and The above first and second guide portions comprise a magnetic material, forming a camera actuator.

7. In Paragraph 6, The above first and second guide portions are a camera actuator that extends parallel to the optical axis passing through the center of the lens.

8. In Paragraph 6, A camera actuator further comprising an adhesive disposed between the first and second guide parts and the extension part, respectively.

9. In Paragraph 8, The above extension has a plurality of fixed ribs, and The above adhesive is a camera actuator disposed between the first and second guide parts and the fixed rib.

10. In Paragraph 6, The above extension part is, A step is formed at the position in contact with the first and second guide parts, and The first and second guide portions are formed to correspond to the shape of the step, and A camera actuator having an adhesive member disposed between the extension portion and the first and second guide portions.

Images