Lens driving device, camera device, and optical instrument

Abstract

The present embodiment relates to a lens driving device comprising: a base; a housing disposed on the base; a bobbin disposed in the housing; a magnet disposed in the housing; a first coil disposed on the bobbin; a second coil disposed on the base; a coil spring for movably supporting the housing with respect to the base in a direction perpendicular to an optical axis; and a ball disposed between the base and the housing.

Description

Lens actuators, camera devices and optical instruments

[0001] The present embodiment relates to a lens driving device, a camera device, and an optical device.

[0002] Modern smartphones are equipped with cameras capable of taking high-resolution photos and videos.

[0003] In particular, recent smartphone cameras are equipped with autofocus (AF) features that automatically adjust focus based on the subject's distance. Furthermore, optical image stabilization (OIS) is being implemented to prevent blurring of images displayed on smartphones due to the user's hand tremors.

[0004] In conventional camera devices, the movement of the moving part relative to the fixed part is elastically supported by a plate spring and wire.

[0005] However, in the conventional camera device mentioned above, the difficulty of design increases because optimization of the first resonance frequency is required, and the settling time is long during operation and the current consumption for OIS operation is high, which is a problem.

[0006] (Patent Document 1) US 2013-0016427 A1

[0007] The present embodiment aims to provide a lens driving device capable of designing the first resonant frequency in a low-frequency range.

[0008] In addition, the present embodiment seeks to provide a lens driving device in which the settling time is reduced during driving.

[0009] In addition, the present embodiment seeks to provide a lens driving device in which current consumed during driving is reduced.

[0010] In addition, the present embodiment seeks to provide a lens driving device in which the crosstalk phenomenon, in which x-axis and y-axis driving unintentionally influence each other, is minimized.

[0011] A lens driving device according to the present embodiment may include a base; a housing disposed on the base; a bobbin disposed within the housing; a magnet disposed in the housing; a first coil disposed on the bobbin; a second coil disposed on the base; a coil spring that supports the housing so that the housing can move in a direction perpendicular to an optical axis with respect to the base; and a ball disposed between the base and the housing.

[0012] Each of the base and the housing includes a groove, and the ball is disposed between the groove of the base and the groove of the housing, and each of the groove of the base and the groove of the housing may include a first inner side and a second inner side facing each other, and a third inner side and a fourth inner side facing each other.

[0013] The first inner side and the second inner side are parallel to each other, the third inner side and the fourth inner side are parallel to each other, the first inner side is connected to the third inner side through a curved surface, the first inner side is connected to the fourth inner side through a curved surface, the second inner side is connected to the third inner side through a curved surface, and the second inner side can be connected to the fourth inner side through a curved surface.

[0014] The distance between the first inner side and the second inner side may be 1.2 to 1.8 times the diameter of the ball.

[0015] In the direction of the optical axis, the depth of the groove of the housing may be deeper than the depth of the groove of the base.

[0016] It may include a metal insert member arranged in at least one of the grooves of the base and the grooves of the housing and in contact with the ball.

[0017] The above base includes a body, a support formed as a separate member from the body, and a joining member joined to the body and the support, and the second coil may be arranged on the body, and the ball may be arranged on the support.

[0018] A dummy member disposed in the housing, the housing including a metal insert member, the magnets including a first magnet and a second magnet disposed on opposite sides with respect to the bobbin, and a third magnet disposed on the opposite side of the dummy member with respect to the bobbin, the insert member being capable of connecting the first magnet, the second magnet, the third magnet, and the dummy member.

[0019] The above insert member may include an upper plate portion disposed on the upper surface of the first magnet and a side plate portion disposed on the outer surface of the first magnet.

[0020] The above ball can overlap the coil spring in a direction perpendicular to the optical axis.

[0021] The above housing and the upper elastic member coupled with the bobbin are included, the base includes a body and an insert terminal disposed in the body, and the coil spring can be coupled with the upper elastic member and the insert terminal.

[0022] A substrate is disposed on the base and electrically connected to the second coil, and the second coil can be disposed between the base and the substrate in the direction of the optical axis.

[0023] A substrate is disposed on the base and electrically connected to the second coil, and at least a portion of the substrate can be disposed between the base and the second coil.

[0024] A camera device according to the present embodiment may include a printed circuit board; an image sensor disposed on the printed circuit board; the lens driving device disposed on the printed circuit board; and a lens coupled to the lens driving device.

[0025] An optical device according to the present embodiment may include a main body; the camera device disposed in the main body; and a display disposed in the main body and outputting at least one of an image and a video captured by the camera device.

[0026] Through this embodiment, the first resonant frequency can be designed in the low-frequency range. In other words, the degree of design freedom can be increased.

[0027] Additionally, the present embodiment can reduce the settling time during operation. That is, the time consumed for autofocus and shake correction operation can be reduced.

[0028] Additionally, this embodiment can reduce the power consumed when operating a camera device. This can increase the smartphone's operating time.

[0029] In addition, the present embodiment can minimize the crosstalk phenomenon in which the x-axis and y-axis drives unintentionally influence each other. Accordingly, the accuracy of the shake correction drive can be increased.

[0030] Fig. 1 is a perspective view of a lens driving device according to the present embodiment.

[0031] Fig. 2 is an exploded perspective view of a lens driving device according to the present embodiment.

[0032] Figure 3 is a cross-sectional view taken along line AA of Figure 1.

[0033] Figure 4 is a cross-sectional view taken along line BB of Figure 1.

[0034] Fig. 5 is a cross-sectional view of a lens driving device according to the present embodiment, cut perpendicular to the optical axis and viewed from above.

[0035] Figure 6 is a perspective view of Figure 1 with the cover omitted.

[0036] Fig. 7 is a perspective view of Fig. 6 with the upper elastic member omitted.

[0037] Fig. 8 is a perspective view of Fig. 7 with part of the housing and dummy parts omitted.

[0038] Fig. 9 is a perspective view of Fig. 8 with the insert member omitted.

[0039] Fig. 10 is a perspective view of Fig. 9 with the bobbin omitted.

[0040] Fig. 11 is a perspective view of the driving unit and the detection unit of the lens driving device according to the present embodiment.

[0041] Fig. 12 is a side view of the ball and related components of the lens driving device according to the present embodiment.

[0042] Fig. 13 is a bottom perspective view of a part of a lens driving device according to the present embodiment, including a ball and related components.

[0043] Fig. 14 is a bottom perspective view of Fig. 13 with the support body omitted.

[0044] Fig. 15 is a bottom perspective view of Fig. 14 with the housing omitted.

[0045] Fig. 16 is a perspective view showing a part of the configuration of a fixing part of a lens driving device according to the present embodiment.

[0046] Fig. 17 is a perspective view showing a part of the configuration of a fixing part of a lens driving device according to a modified example.

[0047] Fig. 18 is a drawing showing the wire and manpower yoke and related configuration of a lens driving device according to another modified example.

[0048] Fig. 19 is an exploded perspective view of a camera device according to the present embodiment.

[0049] Figure 20 is an exploded perspective view of an optical device according to the present embodiment.

[0050] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the attached drawings.

[0051] However, the technical idea of ​​the present invention is not limited to some of the embodiments described, but can be implemented in various different forms, and within the scope of the technical idea of ​​the present invention, one or more of the components between the embodiments can be selectively combined or substituted for use.

[0052] In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be interpreted as having a meaning that can be generally understood by a person of ordinary skill in the technical field to which the present invention belongs, unless explicitly and specifically defined and described, and terms that are commonly used, such as terms defined in a dictionary, may be interpreted in consideration of the contextual meaning of the relevant technology.

[0053] Additionally, the terms used in the embodiments of the present invention are intended to describe the embodiments and are not intended to limit the present invention.

[0054] In this specification, the singular may also include the plural unless specifically stated otherwise in the phrase, and when it is described as “A and / or at least one (or more) of B, C”, it may include one or more of all combinations that can be combined with A, B, C.

[0055] Additionally, in describing components of embodiments of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only intended to distinguish the components from other components, and are not intended to limit the nature, order, or sequence of the components.

[0056] And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, it may include not only cases where the component is 'connected', 'coupled', or 'connected' directly to the other component, but also cases where the component is 'connected', 'coupled', or 'connected' by another component between the component and the other component.

[0057] Additionally, when described as being formed or arranged "above" or "below" each component, "above" or "below" includes not only cases where the two components are in direct contact with each other, but also cases where one or more other components are formed or arranged between the two components. Furthermore, when expressed as "above" or "below," the meaning may include not only the upward direction but also the downward direction based on one component.

[0058] The 'optical axis direction' used below is defined as the optical axis direction of the lens and / or image sensor coupled to the lens drive device.

[0059] The 'vertical direction' used below may be a direction parallel to or the same direction as the optical axis direction. The vertical direction may correspond to the 'z-axis direction'. The 'horizontal direction' used below may be a direction perpendicular to the vertical direction. That is, the horizontal direction may be a direction perpendicular to the optical axis. Therefore, the horizontal direction may include the 'x-axis direction' and the 'y-axis direction'.

[0060] Hereinafter, one of the ‘x-axis direction’ and the ‘y-axis direction’ may be referred to as the ‘first direction’ and the other may be referred to as the ‘second direction’.

[0061] The 'auto focus (AF) function' used below is defined as a function that automatically focuses on a subject by adjusting the distance from the image sensor by moving the lens in the optical axis direction according to the distance of the subject so that a clear image of the subject can be obtained on the image sensor. In addition, 'closed-loop auto focus (CLAF) control' is defined as a function that detects the distance between the image sensor and the lens and provides feedback control of the position of the lens in real time to improve the accuracy of focus adjustment.

[0062] The term "optical image stabilization (OIS) function" used herein is defined as a function that moves or tilts at least one of the lens and the image sensor in a direction perpendicular to the optical axis to compensate for hand shake in order to prevent images or videos from shaking due to the user's hand shake. In addition, "closed-loop auto focus (CLAF) control" is defined as real-time feedback control to improve the accuracy of hand shake compensation.

[0063] Hereinafter, one of the “driving magnet (410)” and the “sensing magnet (610)” may be referred to as the “first magnet” and the other as the “second magnet”. In addition, each of the “driving magnet (410)” and the “sensing magnet (610)” may be referred to as a “magnet”.

[0064] Hereinafter, one of the "AF coil (420)" and the "OIS coil (430)" may be referred to as the "first coil" and the other as the "second coil." In addition, each of the "AF coil (420)" and the "OIS coil (430)" may be referred to as a "coil."

[0065] Hereinafter, one of the "AF moving unit (200)" and the "OIS moving unit (310)" may be referred to as the "first moving unit" and the other as the "second moving unit." In addition, each of the "AF moving unit (200)" and the "OIS moving unit (310)" may be referred to as a "moving unit."

[0066] Hereinafter, one of the “substrate (120)” and the “substrate (630)” may be referred to as the “first substrate” and the other may be referred to as the “second substrate”.

[0067]

[0068] Below, the configuration of the lens driving device according to the present embodiment is described with reference to the drawings.

[0069] Fig. 1 is a perspective view of a lens driving device according to the present embodiment. Fig. 2 is an exploded perspective view of a lens driving device according to the present embodiment. Fig. 3 is a cross-sectional view taken along line AA of Fig. 1. Fig. 4 is a cross-sectional view taken along line BB of Fig. 1. Fig. 5 is a cross-sectional view taken along line BB of Fig. 1 and viewed from above, taken perpendicular to the optical axis, of the lens driving device according to the present embodiment. Fig. 6 is a perspective view of Fig. 1 with the cover omitted. Fig. 7 is a perspective view of Fig. 6 with the upper elastic member omitted. Fig. 8 is a perspective view of Fig. 7 with a portion of the housing and a dummy member omitted. Fig. 9 is a perspective view of Fig. 8 with the insert member omitted. Fig. 10 is a perspective view of Fig. 9 with the bobbin omitted. Fig. 11 is a perspective view of a driving unit and a detection unit of the lens driving device according to the present embodiment. Fig. 12 is a side view of a ball and related components of a lens driving device according to the present embodiment. Fig. 13 is a bottom perspective view of a ball and related components among a portion of a lens driving device according to the present embodiment. Fig. 14 is a bottom perspective view of Fig. 13 with the support body omitted. Fig. 15 is a bottom perspective view of Fig. 14 with the housing omitted. Fig. 16 is a perspective view showing a portion of a fixing portion of a lens driving device according to the present embodiment.

[0070] The lens driving device (10) may be a voice coil motor (VCM). The lens driving device (10) may be a lens driving actuator.

[0071] The lens driving device (10) may include a fixed part (100). The fixed part (100) may be a part that is relatively fixed when the moving part (200, 300) moves. The fixed part (100) may be a part that is fixed when the auto focus is driven. The fixed part (100) may be a part that is fixed when the shake correction is driven. The fixed part (100) may correspond to the image sensor (60) side, and the moving part (200, 300) may correspond to the lens side.

[0072] The lens actuator (10) may include a base (110). The fixing member (100) may include a base (110). The base (110) may be coupled to a cover (130). The base (110) may support a housing (310). The base (110) may support a bobbin (210).

[0073] The base (110) may include a body (111). The OIS coil (430) may be placed in the body (111). The substrate (120) may be placed in the body (111). The body (111) may include a hole or groove in which a support (112) is placed.

[0074] The base (110) may include a support (112). The support (112) may be formed as a separate member from the body (111). The support (112) may be coupled to the body (111). The support (112) may be coupled to the body (111) by a coupling member (113). The ball (540) may be placed on the support (112).

[0075] The base (110) may include a groove (112a). The support (112) may include a groove (112a). The groove (112a) may be formed concavely in the support (112). The groove (112a) may be formed on the upper surface of the support (112). A ball (540) may be arranged in the groove (112a). At least a portion of the ball (540) may be accommodated in the groove (112a). The groove (112a) of the base (110) may be formed in an approximately rectangular shape when viewed from above. The corner portion of the groove (112a) of the base (110) may be formed to be rounded.

[0076] The groove (112a) of the base (110) may include a first inner side and a second inner side facing each other, and a third inner side and a fourth inner side facing each other. The first inner side and the second inner side may be parallel to each other. The third inner side and the fourth inner side may be parallel to each other. The first inner side may be connected to the third inner side through a curved surface. The first inner side may be connected to the fourth inner side through a curved surface. The second inner side may be connected to the third inner side through a curved surface. The second inner side may be connected to the fourth inner side through a curved surface.

[0077] The distance between the first inner side and the second inner side may be 1.2 to 1.8 times the diameter of the ball (540). The distance between the first inner side and the second inner side may be 1.3 to 1.7 times the diameter of the ball (540). The distance between the third inner side and the fourth inner side may be 1.2 to 1.8 times the diameter of the ball (540). The distance between the third inner side and the fourth inner side may be 1.3 to 1.7 times the diameter of the ball (540). Through the above-mentioned structure, long-stroke movement of the housing (310) with respect to the base (110) can be realized.

[0078] The base (110) may include an insert member (112b). The insert member (112b) may be formed of metal. The insert member (112b) may be placed in a groove (112a) of the base (110). The insert member (112b) may be in contact with the ball (540). The insert member (112b) may be formed with a higher strength than the base (110). The insert member (112b) may prevent the ball (540) from being pressed or pressed.

[0079] The base (110) may include a joining member (113). The joining member (113) may connect the body (111) and the support (112). The joining member (113) may be formed of metal. The joining member (113) may be joined to the body (111) and the support (112). The body (111) and the support (112) may include a groove in which the joining member (113) is placed.

[0080] The base (110) may include an insert terminal (114). The insert terminal (114) may be formed of metal. The insert terminal (114) may be electrically connected to the substrate (120). The insert terminal (114) may be disposed in the body (111). The insert terminal (114) may be disposed in the base (110). The insert terminal (114) may be disposed in four corner areas of the base (110).

[0081] The lens actuator (10) may include a substrate (120). The fixing member (100) may include the substrate (120). The substrate (120) may be placed on the base (110). The substrate (120) may be electrically connected to the OIS coil (430). The substrate (120) may be electrically connected to the AF coil (420). The substrate (120) may be electrically connected to the sensor (620).

[0082] The substrate (120) may include a body portion (121). The body portion (121) may be placed on the base (110). The body portion (121) may be placed on the upper surface of the base (110). An OIS coil (430) may be placed on the body portion (121) of the substrate (120). An OIS sensor, which is not shown in the figure, may be placed on the body portion (121) of the substrate (120).

[0083] The substrate (120) may include a terminal portion (122). The terminal portion (122) may be bent from the body portion (121). The terminal portion (122) may be arranged on a side of the base (110). The terminal portion (122) may be arranged in a groove of the base (110). The terminal portion (122) may include a plurality of terminals.

[0084] The lens driving device (10) may include a cover (130). The fixing member (100) may include the cover (130). The cover (130) may be a cover member. The cover (130) may be a shield can. The cover (130) may be a yoke. The cover (130) may be placed on the base (110). The cover (130) may be placed on the base (110). The cover (130) may be coupled to the base (110). The cover (130) may be fixed to the base (110). The cover (130) may be adhesively bonded to the base (110). The cover (130) may cover the housing (310). The cover (130) may form the exterior of the lens driving device (10). The cover (130) may be formed of metal. The cover (130) can block electromagnetic waves.

[0085] The cover (130) may include a top plate (131). The top plate (131) may include a hole through which light passes. The top plate (131) may include a hole arranged on a lens.

[0086] The cover (130) may include a side plate (132). The side plate (132) may extend from the top plate (131). The side plate (132) may be bent and extended from the top plate (131). The side plate (132) may extend downward from the top plate (131). The side plate (132) may be coupled to the base (110).

[0087] The side plate (132) may include a plurality of side plates. The side plate (132) may include four side plates. The side plate (132) may include a first side plate and a second side plate positioned opposite each other, and a third side plate and a fourth side plate positioned opposite each other.

[0088] The lens driving device (10) may include an AF moving unit (200). The AF moving unit (200) may move relative to the fixed unit (100) during AF operation. The AF moving unit (200) may move relative to the OIS moving unit (300) during AF operation.

[0089] The lens actuator (10) may include a bobbin (210). The AF moving unit (200) may include the bobbin (210). The bobbin (210) may be placed within the housing (310). The bobbin (210) may be placed in the housing (310). The bobbin (210) may be placed on the base (110). The bobbin (210) may be placed on the base (110). The bobbin (210) may be placed within the cover (130). The bobbin (210) may be placed on the substrate (120).

[0090] The bobbin (210) can be movably arranged relative to the housing (310). The bobbin (210) can be movably arranged relative to the base (110). The bobbin (210) can be movable relative to the housing (310) in the direction of the optical axis. The bobbin (210) and the housing (310) can be integrally movable relative to the base (110) in a direction perpendicular to the optical axis.

[0091] The bobbin (210) may include a groove (211). The groove (211) may be a damper placement groove. A damper may be placed in the groove (211). The damper may connect the bobbin (210) and the upper elastic member (510). The groove (211) may be formed by a plurality of baffles to prevent the damper from being lost.

[0092] The lens driving device (10) may include an OIS moving unit (300). The OIS moving unit (300) may move relative to the fixed unit (100) when the OIS is driven.

[0093] The lens actuator (10) may include a housing (310). The OIS moving unit (300) may include the housing (310). The housing (310) may be disposed on the base (110). The housing (310) may be disposed on the base (110). The housing (310) may be spaced apart from the base (110). The housing (310) may move relative to the base (110). The housing (310) may be disposed within the cover (130). The housing (310) may be disposed on the substrate (120). The housing (310) may be disposed between the cover (130) and the bobbin (210).

[0094] The housing (310) may include a groove (311). A ball (540) may be placed in the groove (311). At least a portion of the ball (540) may be accommodated in the groove (311). The groove (311) of the housing (310) may be formed in an approximately rectangular shape when viewed from below. The corner portion of the groove (311) of the housing (310) may be formed to be rounded. The groove (311) of the housing (310) may be formed in a shape corresponding to the groove (112a) of the base (110).

[0095] The groove (311) of the housing (310) may include a first inner side and a second inner side facing each other, and a third inner side and a fourth inner side facing each other. The first inner side and the second inner side may be parallel to each other. The third inner side and the fourth inner side may be parallel to each other. The first inner side may be connected to the third inner side through a curved surface. The first inner side may be connected to the fourth inner side through a curved surface. The second inner side may be connected to the third inner side through a curved surface. The second inner side may be connected to the fourth inner side through a curved surface.

[0096] The distance between the first inner side and the second inner side (see w in FIG. 5) may be 1.2 to 1.8 times the diameter of the ball (540) (see d in FIG. 5). The distance between the first inner side and the second inner side may be 1.3 to 1.7 times the diameter of the ball (540). The distance between the third inner side and the fourth inner side may be 1.2 to 1.8 times the diameter of the ball (540). The distance between the third inner side and the fourth inner side may be 1.3 to 1.7 times the diameter of the ball (540). Through the mentioned structure, long stroke movement of the housing (310) with respect to the base (110) may be realized.

[0097] In the direction of the optical axis, the depth of the groove (311) of the housing (310) (see L1 in FIG. 12) may be different from the depth of the groove (112a) of the base (110) (see L2 in FIG. 12). In the direction of the optical axis, the depth of the groove (311) of the housing (310) may be deeper than the depth of the groove (112a) of the base (110). In the direction of the optical axis, the depth of the groove (112a) of the base (110) may be shallower than the depth of the groove (311) of the housing (310). The size of the area where the ball (540) overlaps the housing (310) in the direction perpendicular to the optical axis may be larger than the size of the area where the ball (540) overlaps the base (110) in the direction perpendicular to the optical axis.

[0098] The housing (310) may include an insert member (312). The insert member (312) may be formed of metal. The insert member (312) may be placed in a groove (311) of the housing (310). The insert member (312) may be in contact with the ball (540). The insert member (312) may be formed with a higher strength than the base (110). The insert member (312) may prevent the ball (540) from being pressed or pressed.

[0099] The housing (310) may include an insert member (313). The insert member (313) may be formed of metal. The insert member (313) may be inserted into the housing (310). At least a portion of the insert member (313) may be exposed to the outside of the housing (310). The insert member (313) may connect the first magnet (411), the second magnet (412), the third magnet (413), and the dummy member (440). The strength of the housing (310) may be reinforced by the insert member (313).

[0100] The insert member (313) may include an upper plate (313a). The upper plate (313a) may be arranged on the upper surface of the first magnet (411). The upper plate (313a) may be arranged on the upper surface of the second magnet (412). The upper plate (313a) may be arranged on the upper surface of the third magnet (413). The upper plate (313a) may be arranged on the upper surface of the dummy member (440).

[0101] The insert member (313) may include a side plate (313b). The side plate (313b) may be arranged on the outer surface of the first magnet (411). The side plate (313b) may be arranged on the outer surface of the second magnet (412). The side plate (313b) may be arranged on the outer surface of the third magnet (413). The side plate (313b) may be arranged on the outer surface of the dummy member (440).

[0102] The lens driving device (10) may include a driving unit. The driving unit may move the moving unit (200, 300). The driving unit may include an AF driving unit. The driving unit may include an OIS driving unit. However, some components may be included in both the AF driving unit and the OIS driving unit.

[0103] The lens driving device (10) may include a driving magnet (410). The driving unit may include the driving magnet (410). The driving magnet (410) may be disposed in the housing (310). The driving magnet (410) may be disposed on the housing (310). The driving magnet (410) may be disposed on the inner surface of the housing (310). The driving magnet (410) may be disposed on the lower surface of the housing (310). The driving magnet (410) may be fixed to the housing (310). The driving magnet (410) may be coupled to the housing (310). The driving magnet (410) may be bonded to the housing (310) with an adhesive. The driving magnet (410) may move integrally with the housing (310).

[0104] The driving magnet (410) may include a plurality of magnets. The driving magnet (410) may include three magnets. The driving magnet (410) may include first to third magnets (411, 412, 413). The first magnet (411) may be arranged on the opposite side of the second magnet (412). The first magnet (411) may be arranged on the opposite side of the second magnet (412) with respect to the bobbin (210). The third magnet (413) may be arranged on the opposite side of the dummy member (440). The third magnet (413) may be arranged on the opposite side of the dummy member (440) with respect to the bobbin (210).

[0105] The lens driving device (10) may include an AF coil (420). The driving unit may include the AF coil (420). The AF coil (420) may be disposed on the bobbin (210). The AF coil (420) may be disposed on the bobbin (210). The AF coil (420) may be disposed on the outer surface of the bobbin (210). The AF coil (420) may be disposed on the outer circumferential surface of the bobbin (210). The AF coil (420) may be fixed to the bobbin (210). The AF coil (420) may be coupled to the bobbin (210). The AF coil (420) may be bonded to the bobbin (210) with an adhesive. The AF coil (420) may be directly wound on the bobbin (210). The AF coil (420) can move integrally with the bobbin (210).

[0106] The AF coil (420) may be positioned corresponding to the driving magnet (410). The AF coil (420) may correspond to the driving magnet (410). The AF coil (420) may face the driving magnet (410). The AF coil (420) may electromagnetically interact with the driving magnet (410). The AF coil (420) may interact with the driving magnet (410). When current is applied to the AF coil (420), the AF coil (420) may move in the optical axis direction through the electromagnetic interaction with the driving magnet (410).

[0107] The AF coil (420) can be connected to an external power source through the substrate (120), the insert terminal (114), the coil spring (530), the upper elastic member (510), the substrate (630), the sensor (620), and the lower elastic member (520). The AF coil (420) can be electrically connected to the substrate (120), the insert terminal (114), the coil spring (530), the upper elastic member (510), the substrate (630), the sensor (620), and the lower elastic member (520). Current can be applied to the AF coil (420) through the substrate (120), the insert terminal (114), the coil spring (530), the upper elastic member (510), the substrate (630), the sensor (620), and the lower elastic member (520). However, as a variation, current can be applied to the AF coil (420) through the substrate (120), insert terminal (114), coil spring (530), and upper elastic member (510).

[0108]

[0109] The AF coil (420) may include multiple coils. The AF coil (420) may include two coils. The AF coil (420) may include a first coil corresponding to the first magnet (411) and a second coil corresponding to the second magnet (412).

[0110] The lens driving device (10) may include an OIS coil (430). The driving unit may include the OIS coil (430). The OIS coil (430) may be disposed on the base (110). The OIS coil (430) may be disposed on the base (110). The OIS coil (430) may be disposed on the upper surface of the base (110). The OIS coil (430) may be disposed on the upper side of the base (110). The OIS coil (430) may be fixed to the base (110). The OIS coil (430) may be coupled to the base (110). The OIS coil (430) may be bonded to the base (110) with an adhesive.

[0111] The OIS coil (430) may be placed on the substrate (120). The OIS coil (430) may be placed on the substrate (120). The OIS coil (430) may be placed on the lower surface of the substrate (120). The OIS coil (430) may be placed on the lower side of the substrate (120). The OIS coil (430) may be placed between the substrate (120) and the base (110). The OIS coil (430) may be fixed to the substrate (120). The OIS coil (430) may be coupled to the substrate (120). The OIS coil (430) may be mounted on the substrate (120). The OIS coil (430) may be connected to the substrate (120). The OIS coil (430) may be electrically connected to the substrate (120). The OIS coil (430) can be connected to an external power source through the substrate (120). Current can be applied to the OIS coil (430) through the substrate (120). The OIS coil (430) can be placed between the base (110) and the substrate (120) in the direction of the optical axis. The OIS coil (430) can be placed between the base (110) and the body (121) of the substrate (120) in the direction of the optical axis.

[0112] The OIS coil (430) may be positioned corresponding to the driving magnet (410). The OIS coil (430) may correspond to the driving magnet (410). The OIS coil (430) may face the driving magnet (410). The OIS coil (430) may electromagnetically interact with the driving magnet (410). The OIS coil (430) may interact with the driving magnet (410). When current is applied to the OIS coil (430), the driving magnet (410) may move in a direction perpendicular to the optical axis through the electromagnetic interaction between the OIS coil (430) and the driving magnet (410).

[0113] The OIS coil (430) may include a plurality of coils. The OIS coil (430) may include three coils. The OIS coil (430) may include a first coil corresponding to the first magnet (411), a second coil corresponding to the second magnet (412), and a third coil corresponding to the third magnet (413). At this time, the first coil and the second coil may be x-axis drive coils, and the third coil may be a y-axis drive coil. Conversely, the first coil and the second coil may be y-axis drive coils, and the third coil may be an x-axis drive coil.

[0114] The lens actuator (10) may include a dummy member (440). The dummy member (440) may be placed in the housing (310). The dummy member (440) may correspond to the third magnet (413). The dummy member (440) may have a weight corresponding to that of the third magnet (413). The dummy member (440) may be non-magnetic or have a magnetism weaker than that of the third magnet (413). The dummy member (440) may be placed to balance the weight with the third magnet (413). The dummy member (440) may be a balancing member.

[0115] The lens actuator (10) may include a guide member. The guide member may guide movement of the moving member (200, 300) relative to the fixed member (100) and / or movement of the AF moving member (200) relative to the OIS moving member (300).

[0116] The lens actuator (10) may include an upper elastic member (510). The upper elastic member (510) may be coupled to the housing (310) and the bobbin (210). The upper elastic member (510) may connect the housing (310) and the bobbin (210). The upper elastic member (510) may elastically connect the housing (310) and the bobbin (210). The upper elastic member (510) may be coupled to the upper portion of the housing (310) and the bobbin (210). The upper elastic member (510) may be coupled to the upper portion of the housing (310) and the upper portion of the bobbin (210). The upper elastic member (510) may be coupled to the upper portion of the housing (310) and the upper portion of the bobbin (210). The upper elastic member (510) may be disposed on the upper surface of the housing (310). The upper elastic member (510) can be placed on the upper surface of the bobbin (210). The upper elastic member (510) can be placed on the upper surface of the housing (310) and the upper surface of the bobbin (210).

[0117] The upper elastic member (510) may include an inner portion coupled with the bobbin (210), an outer portion coupled with the housing (310), and a connecting portion connecting the inner portion and the outer portion.

[0118] The upper elastic member (510) may include a plurality of upper elastic members. The upper elastic member (510) may include first to fourth upper elastic members spaced apart from each other. The first to fourth upper elastic members may be connected to the first to fourth coil springs, respectively.

[0119] The lens actuator (10) may include a lower elastic member (520). The lower elastic member (520) may be coupled to the housing (310) and the bobbin (210). The lower elastic member (520) may connect the housing (310) and the bobbin (210). The lower elastic member (520) may elastically connect the housing (310) and the bobbin (210). The lower elastic member (520) may be coupled to the lower portion of the housing (310) and the bobbin (210). The lower elastic member (520) may be coupled to the lower portion of the housing (310) and the bobbin (210). The lower elastic member (520) may be coupled to the lower portion of the housing (310) and the lower portion of the bobbin (210). The lower elastic member (520) may be disposed on the lower surface of the housing (310). The lower elastic member (520) may be placed on the lower surface of the bobbin (210). The lower elastic member (520) may be placed on the lower surface of the housing (310) and the lower surface of the bobbin (210).

[0120] The lower elastic member (520) may include an inner portion coupled with the bobbin (210), an outer portion coupled with the housing (310), and a connecting portion connecting the inner portion and the outer portion.

[0121] The lower elastic member (520) may include a plurality of lower elastic members. The lower elastic member (520) may include two lower elastic members. The lower elastic member (520) may include first and second lower elastic members that are spaced apart from each other. Alternatively, the lower elastic member (520) may include three lower elastic members. The lower elastic member (520) may include first to third lower elastic members that are spaced apart from each other.

[0122] The lens actuator (10) may include a coil spring (530). The coil spring (530) may support the housing (310) so that it can move in a direction perpendicular to the optical axis with respect to the base (110). The coil spring (530) may support the housing (310). The coil spring (530) may support the housing (310) so that it can move. The coil spring (530) may support the housing (310) so that it can move with respect to the base (110). The coil spring (530) may elastically support the housing (310).

[0123] The coil spring (530) may be an elastic member. The coil spring (530) may have elasticity. The coil spring (530) may have restoring force. The coil spring (530) may have flexibility. The coil spring (530) may be formed of metal.

[0124] The coil spring (530) can be coupled with the upper elastic member (510) and the insert terminal (114). The coil spring (530) can connect the upper elastic member (510) and the insert terminal (114). The coil spring (530) can elastically connect the upper elastic member (510) and the insert terminal (114). The upper end of the coil spring (530) can be coupled with the upper elastic member (510). The lower end of the coil spring (530) can be coupled with the insert terminal (114).

[0125] The lens actuator (10) may include a ball (540). The ball (540) may be disposed between the base (110) and the housing (310). The ball (540) may be disposed on the base (110). The ball (540) may be disposed on the base (110). The ball (540) may be disposed on the upper surface of the base (110). The ball (540) may be in contact with the base (110). The ball (540) may be disposed on the housing (310). The ball (540) may be disposed on the lower side of the housing (310). The ball (540) may be in contact with the housing (310). The ball (540) may connect the base (110) and the housing (310). The ball (540) can be placed between the groove (112a) of the base (110) and the groove (311) of the housing (310). The ball (540) can be formed in a spherical shape. The ball (540) can include a curved surface. The ball (540) can have a curvature. The ball (540) can roll between the base (110) and the housing (310).

[0126] The ball (540) can overlap with the coil spring (530) in a direction perpendicular to the optical axis. The ball (540) can overlap with the housing (310) in a direction perpendicular to the optical axis. The ball (540) can overlap with the base (110) in a direction perpendicular to the optical axis. The ball (540) can overlap with the side plate (132) of the cover (130) in a direction perpendicular to the optical axis. The ball (540) can overlap with the bobbin (210) in a direction perpendicular to the optical axis.

[0127] The ball (540) can overlap with the base (110) in the optical axis direction. The ball (540) can overlap with the support (112) of the base (110) in the optical axis direction. The ball (540) can overlap with the housing (310) in the optical axis direction. The ball (540) can be placed between the base (110) and the housing (310) in the optical axis direction.

[0128] The lens actuator (10) may include a detection unit. The detection unit may detect the movement of the moving unit (200, 300). The detection unit may detect the real-time position of the moving unit (200, 300). The values ​​detected by the detection unit may be used for AF feedback driving and OIS feedback driving.

[0129] The lens actuator (10) may include a sensing magnet (610). The sensing magnet (610) may be disposed on the bobbin (210). The sensing magnet (610) may be disposed on the bobbin (210). The sensing magnet (610) may be coupled to the bobbin (210). The sensing magnet (610) may be fixed to the bobbin (210). The sensing magnet (610) may be attached to the bobbin (210). The sensing magnet (610) may be disposed on the outer surface of the bobbin (210). The sensing magnet (610) may be disposed on the outer circumferential surface of the bobbin (210). The sensing magnet (610) may move integrally with the bobbin (210).

[0130] The lens actuator (10) may include a sensor (620). The sensor (620) may be an AF feedback sensor. The sensor (620) may detect the sensing magnet (610). The sensor (620) may detect the magnetic field of the sensing magnet (610). The sensor (620) may be a Hall sensor. The sensor (620) may include a Hall element. The sensor (620) may be positioned corresponding to the sensing magnet (610). The sensor (620) may face the sensing magnet (610).

[0131] The lens driving device (10) may include a driver IC. The driver IC may include a sensor (620). The lens driving device (10) may include a sensor-integrated driver IC. The driver IC may be electrically connected to the AF coil (420). The driver IC may be electrically connected to the AF coil (420) through the lower elastic member (520). Alternatively, as a variation, the driver IC may be electrically connected to the AF coil (420) through the upper elastic member (510).

[0132] The lens actuator (10) may include a substrate (630). The substrate (630) may be electrically connected to a sensor (620). The sensor (620) may be disposed on the substrate (630). The substrate (630) may include four upper terminals coupled to the upper elastic member (510). The substrate (630) may include two lower terminals coupled to the lower elastic member (520). The substrate (630) may be disposed on the dummy member (440). The substrate (630) may be disposed on the housing (310).

[0133] The lens driving device (10) may include an OIS feedback sensor, which is not shown. The OIS feedback sensor may be placed on the substrate (120). The OIS feedback sensor may detect the driving magnet (410). The OIS feedback sensor may detect the position of the housing (310). The value detected by the OIS feedback sensor may be used for OIS feedback driving.

[0134]

[0135] Below, the configuration of a lens driving device according to a modified example is described with reference to the drawings.

[0136] Fig. 17 is a perspective view showing a part of the configuration of a fixing part of a lens driving device according to a modified example.

[0137] A lens actuator according to a variation may include a substrate (120a) disposed on a base (110) and electrically connected to an OIS coil (430). At least a portion of the substrate (120a) may be disposed between the base (110) and the OIS coil (430). Since a ball (540) is disposed between the base (110) and the housing (310) to prevent the housing (310) from coming into contact with the OIS coil (430), in the variation, the OIS coil (430) may be disposed on the upper side of the substrate (120a).

[0138]

[0139] Below, the configuration of a lens driving device according to another modified example is described with reference to the drawings.

[0140] Fig. 18 is a drawing showing the wire and manpower yoke and related configuration of a lens driving device according to another modified example.

[0141] A lens actuator according to another variation may include a wire (530a). The wire (530a) may replace the coil spring (530). A lens actuator according to another variation may include a manpower yoke (550). The manpower yoke (550) may be positioned corresponding to the driving magnet (410). A manpower force may be applied between the manpower yoke (550) and the driving magnet (410). That is, the driving magnet (410) may be pressed toward the manpower yoke (550). Through this, the ball (540) may be pressed between the housing (310) and the base (110). Through this, the ball (540) may be maintained in close contact with the housing (310) and the base (110).

[0142]

[0143] Below, the auto focus (AF) operation of the lens driving device according to the present embodiment is described.

[0144] Referring to FIG. 4, when current is applied to the AF coil (420), an electromagnetic interaction occurs between the AF coil (420) and the driving magnet (410), so that the AF coil (420) can move in the optical axis direction. At this time, the bobbin (210) and the lens can move together with the AF coil (420). The image sensor (60) can be fixedly arranged on the lower side of the base (110). Therefore, when current is applied to the AF coil (420), the lens can move in the optical axis direction with respect to the image sensor (60). Through this, the clarity of the image formed on the image sensor (60) through the lens can be increased.

[0145] Meanwhile, the sensor (620) can detect the position of the bobbin (210) in real time by detecting the sensing magnet (610) placed on the bobbin (210) in real time. The control unit can perform feedback control on the bobbin (210) through the real-time position of the bobbin (210) detected by the sensor (620). Through this, the accuracy of the autofocus function can be improved.

[0146]

[0147] Below, the optical image stabilization (OIS) operation of the lens drive device according to the present embodiment is described.

[0148] Referring to FIGS. 3 to 5, when current is applied to the first coil corresponding to the first magnet (411) and the second coil corresponding to the second magnet (412) among the OIS coils (430), the first magnet (411) and the second magnet (412) can move in the x-axis direction perpendicular to the optical axis due to the electromagnetic interaction between the first magnet (411) and the first coil and between the second magnet (412) and the second coil. At this time, the housing (310), the bobbin (210), and the lens can move together with the first magnet (411) and the second magnet (412). The image sensor (60) can be fixedly arranged on the lower side of the base (110). Therefore, when current is applied to the first coil and the second coil of the OIS coil (430), the lens can move in the x-axis direction with respect to the image sensor (60). Through this, if the user's hand tremor includes an x-axis component, it is possible to perform a drive that compensates for it.

[0149] In addition, when current is applied to the third coil corresponding to the third magnet (413) among the OIS coils (430), the third magnet (413) can move in the y-axis direction perpendicular to the optical axis and the x-axis, respectively, due to the electromagnetic interaction between the third magnet (413) and the third coil. At this time, the housing (310), the bobbin (210), and the lens can be fixedly arranged on the lower side of the base (110). Therefore, when current is applied to the third coil of the OIS coil (430), the lens can move in the y-axis direction with respect to the image sensor (60). Through this, when the user's hand shake includes a y-axis direction component, it is possible to perform driving to offset it.

[0150] Meanwhile, the OIS sensor, which is a non-illustrated configuration, may include a first sensor that detects a first magnet (411) and a second sensor that detects a third magnet (413). The control unit may perform feedback control through the real-time position of the housing (310) detected by the first sensor and the second sensor, thereby improving the accuracy of the shake correction function.

[0151]

[0152] Below, the configuration of a camera device according to the present embodiment is described with reference to the drawings.

[0153] Fig. 19 is an exploded perspective view of a camera device according to the present embodiment.

[0154] The camera device (10A) may include a lens driving device (10). The lens driving device (10) may be a voice coil motor (VCM). The lens driving device (10) may be a lens driving motor. The lens driving device (10) may be a lens driving actuator. The lens driving device (10) may include an AF module. As a variation, the lens driving device (10) may include an OIS module. The lens driving device (10) may be a device that drives a lens. As illustrated in the drawing, the lens driving device (10) may include a lens. However, the lens may be understood as a separate component from the lens driving device (10) as a component of the camera device (10A).

[0155] The camera device (10A) may include a lens module (20). The lens module (20) may be disposed on an image sensor (60). The lens module (20) may be coupled to a lens driving device (10). The lens module (20) may be coupled to a bobbin (210) of the lens driving device (10). The lens module (20) may be moved integrally with the bobbin (210). The lens module (20) may be disposed to be movable with respect to the image sensor (60). The lens module (20) may be moved in the optical axis direction with respect to the image sensor (60).

[0156] The lens module (20) may include a lens. The lens may include a plurality of lenses. The lens module (20) may include a barrel. The plurality of lenses may be arranged within the barrel. The plurality of lenses may be coupled to the inner surface of the barrel. The plurality of lenses may be arranged in a stacked manner within the barrel.

[0157] The camera device (10A) may include a filter (30). The filter (30) may block light of a specific frequency band from passing through the lens module (20) from being incident on the image sensor (60). The filter (30) may be arranged parallel to the xy plane. The filter (30) may be arranged between the lens module (20) and the image sensor (60). The filter (30) may be arranged on the sensor base (40). Alternatively, the filter (30) may be arranged on the base (110) of the lens driving device (10). The filter (30) may include an infrared filter. The infrared filter may block light in the infrared region from being incident on the image sensor (60).

[0158] The camera device (10A) may include a sensor base (40). The sensor base (40) may be disposed between the lens actuator (10) and the printed circuit board (50). The sensor base (40) may include a protrusion (41) on which a filter (30) is disposed. An opening may be formed in a portion of the sensor base (40) on which the filter (30) is disposed so that light passing through the filter (30) may be incident on the image sensor (60). The adhesive member may couple or adhere the base (110) of the lens actuator (10) to the sensor base (40). The adhesive member may additionally serve to prevent foreign substances from entering the interior of the lens actuator (10). The adhesive member may include at least one of an epoxy, a thermosetting adhesive, and an ultraviolet-curable adhesive.

[0159] The camera device (10A) may include a printed circuit board (PCB) (50). The printed circuit board (50) may be a substrate or a circuit board. A lens driving device (10) may be disposed on the printed circuit board (50). A sensor base (40) may be disposed between the printed circuit board (50) and the lens driving device (10). The printed circuit board (50) may be electrically connected to the lens driving device (10). An image sensor (60) may be disposed on the printed circuit board (50). Various circuits, components, control units, etc. may be provided on the printed circuit board (50) to convert an image formed on the image sensor (60) into an electrical signal and transmit it to an external device.

[0160] The camera device (10A) may include an image sensor (60). The image sensor (60) may be configured to form an image by incident light passing through a lens and a filter (30). The image sensor (60) may be mounted on a printed circuit board (50). The image sensor (60) may be electrically connected to the printed circuit board (50). For example, the image sensor (60) may be coupled to the printed circuit board (50) using surface mounting technology (SMT). As another example, the image sensor (60) may be coupled to the printed circuit board (50) using flip chip technology. The image sensor (60) may be arranged such that its optical axis is aligned with that of the lens. That is, the optical axis of the image sensor (60) and the optical axis of the lens may be aligned. The image sensor (60) can convert light irradiated onto the effective image area of ​​the image sensor (60) into an electrical signal. The image sensor (60) can be any one of a CCD (charge coupled device), a MOS (metal oxide semi-conductor), a CPD, and a CID.

[0161] The camera device (10A) may include a motion sensor (70). The motion sensor (70) may be mounted on a printed circuit board (50). The motion sensor (70) may be electrically connected to a control unit (80) through a circuit pattern provided on the printed circuit board (50). The motion sensor (70) may output rotational angular velocity information due to the movement of the camera device (10A). The motion sensor (70) may include a two-axis or three-axis gyro sensor or an angular velocity sensor.

[0162] The camera device (10A) may include a control unit (80). The control unit (80) may be disposed on a printed circuit board (50). The control unit (80) may be electrically connected to a coil (320) of a lens driving device (10). The control unit (80) may individually control the direction, intensity, amplitude, etc. of the current supplied to the coil (320). The control unit (80) may control the lens driving device (10) to perform an autofocus function and / or a shake correction function. Furthermore, the control unit (80) may perform autofocus feedback control and / or shake correction feedback control for the lens driving device (10).

[0163] The camera device (10A) may include a connector (90). The connector (90) may be electrically connected to a printed circuit board (50). The connector (90) may include a port for electrically connecting to an external device.

[0164]

[0165] Below, the configuration of the optical device according to the present embodiment is described with reference to the drawings.

[0166] Figure 20 is an exploded perspective view of an optical device according to the present embodiment.

[0167] The optical device (1) may include one or more of a mobile phone, a cell phone, a portable terminal, a mobile terminal, a smart phone, a smart pad, a portable smart device, a digital camera, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistant), a PMP (Portable Multimedia Player), and a navigation device. The optical device (1) may include any device for taking images or photographs.

[0168] An optical device (1) may include a main body (2). The optical device (1) may include a camera device (10A). The camera device (10A) may be disposed on the main body (2). The camera device (10A) may photograph a subject. The optical device (1) may include a display. The display may be disposed on the main body (2). The display may output one or more of an image or video captured by the camera device (10A). The display may be disposed on a first surface of the main body (2). The camera device (10A) may be disposed on one or more of the first surface of the main body (2) and a second surface opposite the first surface. The camera device (10A) may have a triple camera disposed in a vertical direction of the main body (2). Alternatively, the camera device (10A) may have a triple camera disposed in a horizontal direction of the main body (2).

[0169]

[0170] Although the embodiments of the present invention have been described with reference to the attached drawings, those skilled in the art will appreciate that the present invention can be implemented in other specific forms without altering the technical concept or essential features thereof. Therefore, the embodiments described above should be understood to be illustrative in all respects and not restrictive.

Claims

1. Base; A housing disposed on the above base; A bobbin disposed within the housing; A magnet placed in the above housing; A first coil placed on the above bobbin; A second coil placed on the above base; A coil spring that supports the housing so that it can move in a direction perpendicular to the optical axis with respect to the base; and A lens actuator including a ball disposed between the base and the housing.

2. In paragraph 1, Each of the above base and the above housing includes a groove, The above ball is placed between the above groove of the above base and the above groove of the above housing, A lens driving device in which each of the grooves of the base and the grooves of the housing include a first inner side surface and a second inner side surface facing each other, and a third inner side surface and a fourth inner side surface facing each other.

3. In paragraph 2, The first inner side and the second inner side are parallel to each other, The third inner side and the fourth inner side are parallel to each other, The first inner side is connected to the third inner side through a curved surface, The first inner side is connected to the fourth inner side through a curved surface, The second inner side is connected to the third inner side through a curved surface, A lens actuator in which the second inner surface is connected to the fourth inner surface through a curved surface.

4. In paragraph 2, A lens actuator wherein the distance between the first inner surface and the second inner surface is 1.2 to 1.8 times the diameter of the ball.

5. In paragraph 2, A lens actuator in which, in the direction of the optical axis, the depth of the groove of the housing is deeper than the depth of the groove of the base.

6. In paragraph 2, A lens actuator including a metal insert member arranged in at least one of the grooves of the base and the grooves of the housing and in contact with the ball.

7. In paragraph 1, The above base includes a body, a support formed as a separate member from the body, and a joining member joined to the body and the support, The second coil is placed in the body, The above ball is a lens actuator placed on the support.

8. In paragraph 1, Including a dummy member placed in the above housing, The above housing comprises a metal insert member, The above magnets include a first magnet and a second magnet arranged on opposite sides of the bobbin, and a third magnet arranged on the opposite side of the dummy member with respect to the bobbin. The above insert member is a lens driving device that connects the first magnet, the second magnet, the third magnet, and the dummy member.

9. In paragraph 8, A lens actuator including an upper plate portion disposed on the upper surface of the first magnet and a side plate portion disposed on the outer surface of the first magnet.

10. In paragraph 1, The above ball is a lens actuator that overlaps the coil spring in a direction perpendicular to the optical axis.

Images