Lens driving device, and camera device and optical instrument comprising same

Abstract

An embodiment includes: a base; a bobbin disposed to be spaced apart from the base; a magnet disposed on the bobbin; a coil disposed on the base and configured to move the bobbin in an optical axis direction by interaction with the magnet; and a rolling member disposed between the bobbin and the base, wherein the rolling member includes an upper ball member positioned between a first point and the uppermost end of the bobbin, a lower ball member positioned between a second point and the lowermost end of the bobbin, and a middle ball member disposed between the upper ball member and the lower ball member, the first point is a point that is 80 percent of the total length of the magnet in the optical axis direction from the lowermost end of the magnet, and the second point is a point that is 20 percent of the total length of the magnet from the lowermost end of the magnet.

Description

Lens driving device, and camera device and optical device including the same

[0001] The embodiment relates to a lens driving device and a camera device and optical device including the same.

[0002] Since it is difficult to apply the voice coil motor (VCM) technology used in conventional camera modules to ultra-small, low-power camera modules, active research has been conducted in this regard.

[0003] Demand and production of electronic products such as smartphones and camera-equipped mobile phones are increasing. Mobile phone cameras are trending toward higher resolution and miniaturization, and consequently, actuators are also becoming smaller, larger, and more multifunctional. To achieve higher resolution mobile phone cameras, improved camera performance and additional features such as autofocus, shutter shake reduction, and zooming are required.

[0004] The embodiment provides a lens driving device capable of preventing tilt of a bobbin and suppressing detachment of a magnet from a bobbin during autofocus operation, and a camera device and optical device including the same.

[0005] A lens driving device according to an embodiment comprises: a base; a bobbin spaced apart from the base; a magnet disposed on the bobbin; a coil disposed on the base and moving the bobbin in the direction of an optical axis by interaction with the magnet; and a rolling member disposed between the bobbin and the base, wherein the rolling member comprises: an upper ball member positioned between a first point and an uppermost end of the bobbin; a lower ball member positioned between a second point and a lowermost end of the bobbin; and an intermediate ball member positioned between the upper ball member and the lower ball member, wherein the first point is a point that is 80 percent of the total length of the magnet in the direction of the optical axis from the lowermost end of the magnet, and the second point is a point that is 20 percent of the total length of the magnet from the lowermost end of the magnet.

[0006] The upper ball member may be positioned higher than the uppermost end of the magnet. The lower ball member may be positioned lower than the lowermost end of the magnet.

[0007] Alternatively, at least a portion of the upper ball member may overlap the magnet in a direction perpendicular to the optical axis direction. Alternatively, at least a portion of the lower ball member may overlap the magnet in a direction perpendicular to the optical axis direction.

[0008] The magnet includes an N pole and an S pole facing each other in the optical axis direction and a boundary surface between the N pole and the S pole, and the intermediate ball member can overlap the boundary surface of the magnet in a direction perpendicular to the optical axis direction.

[0009] The bobbin may include a receiving groove for arranging the cloud member, and the receiving groove may include a plurality of grooves spaced apart from each other and corresponding to the upper ball member, the middle ball member, and the lower ball member.

[0010] The magnet may include a first surface facing the coil, a second surface opposite the first surface, a third surface connecting one side of the first surface and one side of the second surface, and a fourth surface connecting the other side of the first surface and the other side of the second surface, and the magnet may include a portion whose length in a direction parallel to the first surface decreases from the second surface toward the first surface, and the bobbin may include a mounting portion for accommodating the magnet.

[0011] The lens driving device may include a circuit board disposed on the base and electrically connected to the coil; and a yoke disposed on the base and facing the magnet in a direction perpendicular to the optical axis direction and having an attractive force with the magnet.

[0012] The upper ball member, the middle ball member, and the lower ball member may be disposed on an outer surface of a first side of the bobbin facing the coil, the upper ball member may include a first ball member positioned on one side of the magnet and a second ball member positioned on the other side of the magnet, the middle ball member may include a third ball member positioned on the one side of the magnet and a fourth ball member positioned on the other side of the magnet, and the lower ball member may include a fifth ball member positioned on the one side of the magnet and a sixth ball member positioned on the other side of the magnet.

[0013] The diameter of each of the third ball member and the fourth ball member may be smaller than the diameter of each of the first ball member, the second ball member, the third ball member, and the fourth ball member. Alternatively, the diameter of each of the first ball member, the fourth ball member, and the fifth ball member may be smaller than the diameter of each of the second ball member, the third ball member, and the sixth ball member.

[0014] Alternatively, the upper ball member, the middle ball member, and the lower ball member may be disposed on an outer surface of a first side of the bobbin facing the coil, the upper ball member may include a first ball member disposed on one of the one side and the other side of the magnet, the middle ball member may include a second ball member disposed on the other of the one side and the other side of the magnet, and the lower ball member may include a third ball member disposed on one of the one side and the other side of the magnet.

[0015] According to another embodiment, a lens driving device includes a base; a bobbin disposed spaced apart from the base; a magnet disposed on a first side of the bobbin; a coil disposed on the base and moving the bobbin in the direction of an optical axis by interaction with the magnet; a rolling member disposed between the first side of the bobbin and the first side of the base; and a yoke disposed on the first side of the base and having an attractive force with the magnet, wherein the rolling member includes an upper ball member, a middle ball member, and a lower ball member disposed spaced apart from each other in the direction of the optical axis, wherein an uppermost end of the upper ball member is positioned higher than an uppermost end of the magnet, a lowermost end of the lower ball member is positioned lower than a lowermost end of the magnet, and the middle ball member may be positioned between the uppermost and the lowermost ends of the magnet.

[0016] Each of the upper ball member and the lower ball member does not overlap with the magnet in a direction perpendicular to the optical axis direction, and the middle ball member can overlap with the magnet in a direction perpendicular to the optical axis direction.

[0017] Alternatively, at least a portion of the upper ball member and at least a portion of the lower ball member may overlap the magnet in a direction perpendicular to the optical axis direction, and the middle ball member may overlap the magnet in a direction perpendicular to the optical axis direction.

[0018] In an embodiment, preset support points of the bobbin can be supported by the upper ball member, the lower ball member, and the middle ball member, tilting of the bobbin can be prevented during AF operation, and reliability of the AF operation can be increased.

[0019] In an embodiment, by combining a magnet having an inclined side (or chamfered surface) with a bobbin's mounting portion, the bonding force between the magnet and the bobbin can be improved, and the magnet can be prevented from being detached from the bobbin due to impact.

[0020] In an embodiment, the amount of adhesive applied between the magnet and the bobbin mounting portion can be reduced, and the material cost for the adhesive can be reduced.

[0021] Fig. 1 is a perspective view of a lens driving device according to an embodiment.

[0022] Fig. 2 is an exploded perspective view of the lens driving device of Fig. 1.

[0023] Figure 3 is a perspective view of the lens driving device with the cover member removed.

[0024] Figure 4 is a perspective view of a bobbin.

[0025] Figure 5 is a perspective view of the bobbin and cloud member.

[0026] Figure 6 is an exploded perspective view of the base, coil, circuit board, position sensor, and yoke.

[0027] Figure 7 is an exploded perspective view of the base, cloud member, circuit board, coil, and position sensor.

[0028] Figure 8 is a top view of the bobbin, magnet, cloud member, and base.

[0029] Fig. 9 is a cross-sectional view of the lens driving device in the AB direction of Fig. 3.

[0030] Fig. 10 is a cross-sectional view of the lens driving device in the CD direction of Fig. 3.

[0031] Figure 11 shows a cloud member placed on a bobbin.

[0032] Figure 12a shows one embodiment of a cloud member arranged on a bobbin.

[0033] Figure 12b shows an embodiment of a cloud member arranged on a bobbin.

[0034] Figure 12c shows one embodiment of a cloud member arranged on a bobbin.

[0035] Fig. 13 shows an exploded perspective view of a camera device according to an embodiment.

[0036] Fig. 14 shows a perspective view of an optical device according to an embodiment.

[0037] Figure 15 shows a configuration diagram of the optical device illustrated in Figure 14.

[0038] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0039] 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.

[0040] 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.

[0041] In addition, the terms used in the embodiments of the present invention are for the purpose of describing the embodiments and are not intended to limit the present invention. In this specification, the singular may also include the plural unless specifically stated 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, and C.

[0042] 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.

[0043] And, when it is described that a component is 'connected', 'joined' or 'connected' to another component, it can include not only cases where the component is directly connected, joined or connected to the other component, but also cases where the component is 'connected', 'joined' or 'connected' by another component between the component and the other component. Also, when it is described that it is 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. Also, when it is expressed as "above" or "below", it can include the meaning of the downward direction as well as the upward direction based on one component.

[0044] Hereinafter, the lens driving device may be expressed as a lens driving unit, a VCM (Voice Coil Motor), an actuator, or a lens moving device, and the term "coil" may be expressed as a coil unit, and the term "elastic member" may be expressed as an elastic unit or a spring. In addition, in the following description, the term "terminal" may be expressed as a pad, an electrode, a conductive layer, or a bonding portion.

[0045] For convenience of explanation, the lens driving device according to the embodiment is described using the Cartesian coordinate system (x, y, z), but it may be described using another coordinate system, and the embodiment is not limited thereto. In each drawing, the x-axis and the y-axis may mean a direction perpendicular to the optical axis (or the z-axis) or a direction perpendicular to the optical axis direction. In addition, the z-axis direction, which is the optical axis (OA) direction, may be expressed as one of the 'first direction', the 'second direction', and the 'third direction', and the x-axis direction may be expressed as another of the 'first direction', the 'second direction', and the 'third direction', and the y-axis direction may be expressed as the remaining other of the 'first direction', the 'second direction', and the 'third direction'. In addition, the optical axis direction may be the direction of the optical axis or a direction parallel to the optical axis. The optical axis (OA) may be the optical axis of the lens barrel or the optical axis of a lens mounted on the lens barrel. Alternatively, for example, the optical axis (OA) may be an axis that is perpendicular to the imaging area of ​​the image sensor and passes through the center of the imaging area.

[0046] 'Auto-focusing' refers to automatically focusing an image of a subject on an image sensor surface. The lens driving device according to the embodiment can perform an auto-focusing operation of moving an optical module (or lens module) comprising at least one lens in a first direction.

[0047] FIG. 1 is a perspective view of a lens driving device (100) according to an embodiment, FIG. 2 is an exploded perspective view of the lens driving device (100) of FIG. 1, FIG. 3 is a perspective view of the lens driving device (100) with the cover member (300) removed, FIG. 4 is a perspective view of a bobbin (110), FIG. 5 is a perspective view of a bobbin (100) and a cloud member (33), FIG. 6 is an exploded perspective view of a base (210), a coil (120), a circuit board (190), a position sensor (170), and a yoke (38), FIG. 7 is an exploded perspective view of a base (210), a cloud member (33), a circuit board (190), a coil (120), and a position sensor (170), and FIG. 8 is a top view of a bobbin (110), a magnet (130), a cloud member (33), and a base (210), and FIG. 9 is a cross-sectional view of the lens driving device (100) in the AB direction of FIG. 3, FIG. 10 is a cross-sectional view of the lens driving device (100) in the CD direction of FIG. 3, and FIG. 11 shows a cloud member (33) arranged on a bobbin (110).

[0048] Referring to FIGS. 1 to 11, the lens driving device (100) may include a bobbin (110), a magnet (130), a base (210), a coil (120), a yoke (38), and a cloud member (33). In addition, the lens driving device (100) may further include a position sensor (170) for AF feedback driving. In addition, the lens driving device (100) may further include a circuit board (190) electrically connected to the position sensor (170) for supplying a driving signal to the position sensor (170) and receiving an output of the position sensor (170). In addition, the lens driving device (100) may further include a cover member (300) for accommodating the base (210).

[0049] The bobbin (110) may be placed inside the cover member (300). The bobbin (110) may be coupled or mounted with a lens module (400, see FIG. 13). At least a portion of the bobbin (110) may be placed inside the base (210). The bobbin (110) may be moved in the direction of the optical axis (OA) or a first direction (e.g., the Z-axis direction) for AF operation. The bobbin (110) may also be expressed as a “lens carrier” or a “lens holder.”

[0050] The bobbin (110) may have an opening (101) for mounting the lens module (400). For example, the opening (101) may be a hole or a through hole penetrating the bobbin (110) in the direction of the optical axis. The bobbin (110) may have various shapes suitable for mounting the lens module (400). For example, the shape of the bobbin (110) may include at least one of a circle, an oval, or a polygon.

[0051] The bobbin (110) may include at least one first stopper (5A) arranged on its upper surface. For example, the first stopper (5A) may have a structure that protrudes in the optical axis direction or upward direction from the upper surface of the bobbin (110). The first stopper (5A) may prevent the upper surface of the bobbin (110) from directly colliding with the inner surface of the upper plate (301) of the cover member (300). In addition, the bobbin (110) may include at least one second stopper (not shown) arranged on its lower surface.

[0052] The bobbin (110) may include a plurality of sides. The bobbin (110) may include a plurality of sides disposed between the upper surface of the bobbin and the lower surface of the bobbin. The bobbin (110) may include a mounting portion (112) for receiving a magnet (130). The bobbin (110) may include a mounting portion (112) formed or disposed on any one side (side or outer surface) of the plurality of sides (or side surfaces, or outer surfaces). The mounting portion (112) may be in the form of a groove. For example, the mounting portion (112) may be a groove that is recessed from the outer surface (or the first side surface or the first outer surface) of the first side of the bobbin (110). The mounting portion (112) may include a first opening for assembling or inserting the magnet (130). The magnet (130) can be inserted into the mounting portion (112) through the first opening and assembled with the bobbin (110). The first opening can be exposed to the upper surface of the bobbin (110). The mounting portion (112) can include a second opening facing the coil (120). The second opening can expose the first surface of the magnet (130) facing the coil (130).

[0053] The shape of the mounting portion (112) may be identical to the shape of the magnet (130). The mounting portion (112) may include a bottom surface (112A) and at least one side surface (112B). The bottom surface (112A) may have a step in the optical axis direction from the top surface of the bobbin (110). The bottom surface (112A) may be positioned lower than the top surface of the bobbin (110) and higher than the bottom surface of the bobbin (110). For example, the side surface (112B) of the mounting portion (112) may include a first side surface (112B1) facing the first surface of the magnet (130), a second side surface (112B2) connected to one side of the first side surface (112B1), and a third side surface (112B3) connected to the other side of the first side surface (112B1). The second side (112B2) and the third side (112B3) may be positioned on opposite sides with respect to the magnet (130). The second side of the magnet (130) may be the opposite side of the first side of the magnet (130).

[0054] Each of the second side (112B2) and the third side (112B3) of the mounting portion (112) may be an inclined surface with respect to the first side (112B1). In other embodiments, the second side (112B2) and the third side (112B3) may be expressed as a “wall” or a “side wall.”

[0055] For example, the interior angle between the first side (112B1) and the second side (112B2) may be an acute angle. For example, the interior angle between the first side (112B1) and the third side (112B3) may be an acute angle. The second side (112B2) and the third side (112B3) of the mounting portion (112) may be chamfered surfaces. This may prevent or suppress the magnet (130) from being detached from the mounting portion (112) of the bobbin (110). In addition, the chamfered surface of the mounting portion (112) of the bobbin (110) may serve as an assembly position guide when the magnet (130) is coupled to the bobbin (110), thereby facilitating assembly. The mounting portion (112) may also be expressed as a “pocket.” For example, the shape of the mounting portion (112) viewed from above may be a trapezoidal shape. This may prevent or suppress the magnet (130) from being detached from the mounting portion (112) of the bobbin (110), and may allow the magnet (130) to be attached to the mounting portion (112) using a small amount of adhesive (e.g., epoxy). In addition, a groove (6) may be formed in the mounting portion (112) to allow the adhesive to be evenly spread over the mounting portion (112). The groove (6) may include a first groove (6A) formed on a side surface (112B) of the mounting portion (112) and a second groove (6B) formed on a bottom surface (112A) of the mounting portion (112).

[0056] The bobbin (110) may include at least one receiving groove (17) for arranging or receiving a cloud member (33). The receiving groove (17) may be alternatively expressed as a “groove,” a “guide portion,” or a “guide groove.” At least a portion of the cloud member (33) may be in contact with the receiving groove (17).

[0057] The receiving groove (17) may be formed on either side of the bobbin (110). The receiving groove (17) may be formed on the side (110A) of the bobbin (110) facing the coil (120). The receiving groove (17) may be recessed from the outer surface of the side (110A) of the bobbin (110). The receiving groove (17) may include a plurality of grooves spaced apart from each other. The number of the receiving grooves (17) may be the same as the number of ball members. For example, the receiving groove (17) may include a plurality of grooves (7A to 7F) corresponding to the upper ball member, the middle ball member, and the lower ball member.

[0058] For example, the receiving groove (17) may include a plurality of first grooves (7A to 7C) located on one side of the magnet (130) and a plurality of second grooves (7D to 7F) located on the other side of the magnet (130).

[0059] The plurality of first grooves (7A to 7C) may be arranged spaced apart from each other in the direction of the optical axis, and may be arranged in a line or aligned with each other in the direction of the optical axis. The plurality of second grooves (7D to 7F) may be arranged spaced apart from each other in the direction of the optical axis, and may be arranged in a line or aligned with each other in the direction of the optical axis.

[0060] In FIG. 4, the number of first grooves is 3 and the number of second grooves is 3, but in other embodiments, the number of first grooves and second grooves may be 2 or 4 or more.

[0061] The magnet (130) can be placed on the bobbin (110). The magnet (130) can be coupled to the bobbin (110). The magnet (130) can be placed on one side (110A) of the bobbin (110) or coupled to one side (110A) of the bobbin (110). The magnet (130) can be placed between one side (110A) of the bobbin (110) and the side plate (302) of the cover member (300). The magnet (130) can be placed within the mounting portion (112) of the bobbin (110).

[0062] The magnet (130) may have a shape corresponding to the outer surface of one side (110A) of the bobbin (110). The magnet (130) may have a polyhedral (e.g., hexahedral) shape, but is not limited thereto. Referring to FIG. 2, the magnet (130) may include a first surface (8A) facing the coil (120), a second surface (8B) opposite the first surface (8A) of the magnet (130), a third surface (8C) connecting one side of the first surface (8A) and one side of the second surface (8B), and a fourth surface (8D) connecting the other side of the first surface (8A) and the other side of the second surface (8B). The interior angle between the first surface (8A) and the third surface (8C) may be an obtuse angle, and the interior angle between the first surface (8A) and the fourth surface (8D) may be an obtuse angle. In addition, the interior angle between the second surface (8B) and the third surface (8C) may be an acute angle, and the interior angle between the second surface (8B) and the fourth surface (8D) may be an acute angle. The area of ​​the first surface (8A) may be smaller than the area of ​​the second surface (8B). In another embodiment, the area of ​​the first surface of the magnet (130) may be equal to the area of ​​the second surface of the magnet (130).

[0063] The magnet (130) may include a portion in which the horizontal length (W) decreases from the second surface (8B) toward the first surface (8A). At this time, the horizontal direction of the magnet (130) may be a direction parallel to the first surface (8A) or the second surface (8B) (e.g., the Y-axis direction). In other embodiments, the horizontal length of the magnet (130) may be constant or uniform. That is, in other embodiments, the internal angle formed by the first surface (or second surface) and the third surface (or fourth surface) of the magnet (130) may be a right angle. In addition, at this time, the mounting portion (112) may have a shape that matches the shape of the magnet (130) according to other embodiments.

[0064] The magnet (130) may be a unipolar magnet or a bipolar magnet having two different polarities (e.g., a north pole and a south pole) and a naturally formed boundary between the different polarities. The magnet (130) may be a bipolar magnet having a north pole and a south pole in the direction of the optical axis. For example, the north pole and the south pole of the magnet (130) may face each other in the direction of the optical axis.

[0065] In another embodiment, the magnet (130) may be a two-pole magnet with a N pole and a S pole in a direction perpendicular to the optical axis.

[0066] In another embodiment, to enhance the electromagnetic force, the magnet (130) may be a four-pole magnet including two N poles and two S poles or a bipolar magnet. For example, the magnet (130) may include a first magnet section including an N pole and a S pole, a second magnet section including an S pole and an N pole, and a partition wall disposed between the first magnet section and the second magnet section. In this case, the partition wall may include a section having almost no polarity, which is a substantially non-magnetic section, and may be filled with air or made of a non-magnetic material, and may be expressed as a "neutral zone." For example, the first magnet section and the second magnet section may face each other in the optical axis direction, and the first magnet section and the second magnet section may be disposed to face each other with different polarities in the optical axis direction. In other embodiments, for example, the first magnet portion and the second magnet portion may face each other in a direction perpendicular to the optical axis direction, or the first magnet portion and the second magnet portion may be arranged to face each other with different polarities in a direction perpendicular to the optical axis direction.

[0067] The base (210) may be at least partially disposed within the cover member (300). The base (210) may accommodate at least a portion of the bobbin (110) on the inside. The base (210) may support at least one of the coil (120), the circuit board (190), and the yoke (38). The base (210) can accommodate an AF moving unit (or movable unit) (e.g., an AF moving unit) on the inside so that the bobbin (110) can move in the optical axis direction. The base (210) may be expressed as a “housing” or a “case”. For example, the AF moving unit may include a bobbin (110) and a configuration coupled to or mounted on the bobbin (110). For example, the AF moving unit may include a bobbin (110) and a magnet (130). Alternatively, the AF moving unit may include a lens module (400) coupled to or mounted on the bobbin (110).

[0068] The base (210) may include a cavity (22) for accommodating the bobbin (110). The base (210) may include an opening (201) for exposing at least a portion of the bobbin (110) (or the lens module (400)). The opening (201) may be expressed as a hole or a hollow space. The opening (201) may be located at the center or a central region of the base (210). For example, the opening (201) may be in the form of a through hole penetrating the base (210) in the direction of the optical axis. The opening (201) may have a shape corresponding to the shape of the bobbin (110), for example, a circle (or an ellipse) or a polygon (for example, a square or an octagon).

[0069] The base (210) may include a plurality of side portions corresponding to the plurality of side portions of the bobbin (110). The side portions of the base (210) may correspond to the side plates of the cover member (300). For example, the base (210) may include a first side portion (42) corresponding to the first side portion (110A) of the bobbin (110).

[0070] The base (210) may include a mounting portion (141) for placing the coil (120). The mounting portion (141) may be formed on the first side (42) of the base (210). The mounting portion (141) may be an opening, a hole, or a through hole. In other embodiments, the mounting portion of the base (210) may be in the form of a groove or a recess. In other embodiments, the base (210) may not include the mounting portion (141).

[0071] The base (210) may include a groove (48) for placing a circuit board (190). The groove (48) may be recessed from the outer surface of the first side (42) of the base (210). In other embodiments, the base (210) may not include the groove (48).

[0072] Referring to FIG. 7, the base (210) may include a guide portion (49) in which at least a portion of the cloud member (33) is disposed. The receiving groove (17) of the bobbin (110) may face or overlap the guide portion (49) of the base (210) in a second direction (e.g., in the X-axis direction). The cloud member (33) may be disposed between the receiving groove (17) of the bobbin (110) and the guide portion (49) of the base (210).

[0073] The guide portion (49) may include a first guide portion (49A) corresponding to, opposite to, or overlapping with the grooves (7A to 7C) of the bobbin (110) and a second guide portion (49B) corresponding to, opposite to, or overlapping with the grooves (7D to 7F) of the bobbin (110). The first guide portion (49A) may be located on one side of the coil (120), and the second guide portion (49B) may be located on the other side of the coil (120). The guide portion (49) may be a groove. The guide portion (49) may be a groove that is recessed from the inner surface of the first side (42) of the base (210). The guide portion (49) may extend in the optical axis direction.

[0074] In another embodiment, the first and second guide portions (49A, 49B) of FIG. 7 may be formed on the outer surface of the first side (110A) of the bobbin (110), and the plurality of grooves (7A to 7F) of FIG. 4 may be formed on the inner surface of the first side (42) of the base (210).

[0075] The coil (120) may be arranged to correspond to, face, or overlap the magnet (130) in a direction perpendicular to the optical axis direction (e.g., in the second direction (X-axis direction). The coil (120) may be arranged on the base (210). The coil (120) may be arranged on the first side (42) of the base (210). For example, the coil (120) may be arranged within the mounting portion (141) of the base (210).

[0076] A driving signal (e.g., a driving current or voltage) may be supplied or applied to the coil (120). In this case, the driving signal may be a direct current signal, but in other embodiments, the driving signal may be an alternating current signal, or the driving signal may include a direct current signal and an alternating current signal. The coil (120) may be a driving AF (Auto Focus) coil that electromagnetically interacts with a magnet (130) disposed on the bobbin (110).

[0077] The AF moving part (or movable part) can be moved in the first direction by the electromagnetic force resulting from the interaction between the coil (120) and the magnet (130). For example, the bobbin (110) can be moved upward (in the +Z-axis direction) or downward (in the -Z-axis direction). By controlling the intensity and / or polarity (e.g., the direction in which current flows) of the driving signal applied to the coil (120) to adjust the intensity and / or direction of the electromagnetic force resulting from the interaction between the coil (120) and the magnet (130), the movement of the AF moving part in the first direction can be controlled, thereby performing the auto-focusing function.

[0078] The coil (120) may have a closed loop shape. The coil (120) may include a ring shape having a hole, a central hole, or a hollow. For example, the coil (120) may be a coil ring shape wound clockwise or counterclockwise around an axis that is perpendicular to the optical axis and parallel to the second direction (e.g., the X-axis direction).

[0079] The coil (120) may be placed on or mounted on the circuit board (190). The coil (120) may be coupled to the circuit board (190). The coil (120) may be placed on a first surface of the circuit board (190). In this case, the first surface of the circuit board (190) may be a surface facing the outer surface of the first side (42) of the magnet (130) or the base (210). The coil (120) may be placed to face the magnet (130) in a direction perpendicular to the optical axis direction (e.g., the second direction).

[0080] The coil (120) may be electrically connected to a circuit board (190). For example, the coil (120) may be electrically connected to pads (not shown) of the circuit board (190) by solder or a conductive adhesive.

[0081] A circuit board (190) may be placed on a base (210). The circuit board (190) may be coupled to the base (210). For example, the circuit board (190) may be placed on or coupled to a first side (42) of the base (210).

[0082] The base (210) may include a mounting portion (48) for placing or settling the circuit board (190). For example, the mounting portion (48) may be a groove that is recessed from the outer surface of the first side (42) of the base (210). The circuit board (190) may be a printed circuit board or FPCB. The circuit board (190) may be joined to the mounting portion (48) of the base (210) by an adhesive. A guide groove (41A) may be formed in the mounting portion (48) of the base (210) to evenly distribute the adhesive. For example, the guide groove (41A) may be formed on the bottom surface of the mounting portion (48) of the base (210).

[0083] The circuit board (190) may include a terminal portion (21) for electrically connecting with an external device or apparatus. The terminal portion (21) may include a plurality of terminals (P1 to P4). In FIG. 2, the number of terminals is four, but in other embodiments, the number of terminals may be two or more. The plurality of terminals (P1 to P4) may be arranged on a second surface of the circuit board (190). The second surface of the circuit board (190) may be an opposite surface of the first surface of the circuit board (190). The terminal portion (21) may be arranged on a lower portion of the second surface of the circuit board (190) and may be exposed from a side plate (302) of the cover member (300). The circuit board (190) may include circuit patterns or wires for electrically connecting the position sensor (170) and the terminals (P1 to P4) of the terminal portion (21) to each other.

[0084] The position sensor (170) may be placed on the base (210). The position sensor (170) may be placed on the first side (42) of the base (210). The position sensor (170) may be placed within the mounting portion (141) of the base (210). The position sensor (170) may be electrically connected to the circuit board (190). The position sensor (170) may be placed on the circuit board (190). The position sensor (170) may be electrically connected to the circuit board (190) by solder or a conductive adhesive. The position sensor (170) may be placed or mounted on the first surface of the circuit board (190).

[0085] The position sensor (170) may face the magnet (130) in a direction perpendicular to the optical axis direction, for example, in the second direction. At least a portion of the position sensor (170) may overlap the magnet (130) in the second direction (e.g., in the X-axis direction). Additionally, the position sensor (170) may face or overlap the yoke (38) in the second direction (e.g., in the X-axis direction). In other embodiments, the position sensor (170) may not face or overlap the yoke (38) in a direction perpendicular to the optical axis direction. The position sensor (170) may be disposed within the central hole of the coil (120). In other embodiments, the position sensor (170) may be disposed outside the central hole of the coil (120).

[0086] The position sensor (170) can detect the displacement or position of the bobbin (110) in the optical axis direction. The position sensor (170) can detect the strength of the magnetic field of the magnet (130). The position sensor (170) can output an output signal according to the result of detecting the strength of the magnetic field of the magnet (130). The control unit of the camera device (200) or the control unit (780) of the optical device (200A) can detect or detect the displacement of the bobbin (110) in the optical axis direction using the output signal of the position sensor (170).

[0087] The position sensor (170) may be implemented in the form of a driver IC including a Hall sensor. When the position sensor (170) is in the form of a driver IC including a Hall sensor, the position sensor (170) may include first to fourth terminals for transmitting and receiving data with the outside using data communication using a protocol, for example, I2C communication, and fifth and sixth terminals for supplying a driving signal to the coil (120). At this time, the first and second terminals of the position sensor (170) may be for receiving a power signal, the third terminal of the position sensor (170) may be for transmitting and receiving a clock signal, and the fourth terminal may be for transmitting and receiving a data signal. Each of the terminals (P1 to P4) of the circuit board (190) may be electrically connected to a corresponding one of the first to fourth terminals of the position sensor (170). Additionally, the fifth and sixth terminals of the position sensor (170) can be electrically connected to the coil (120) through the circuit board (190), and the position sensor (170) can supply a driving signal to the coil (120).

[0088] In another embodiment, the position sensor (170) may be implemented as a Hall sensor alone. When the position sensor (170) is implemented as a Hall sensor alone, the position sensor (170) may include two input terminals to which a driving signal or power is supplied and two output terminals for outputting an output signal. In addition, two terminals (P1, P2) of the circuit board (190) may be electrically connected to the two input terminals of the position sensor (170) and may supply power or a driving signal to the two input terminals of the position sensor (17). In addition, two other terminals (P3, P4) of the circuit board (190) may be electrically connected to the two output terminals of the position sensor (170) and may receive an output signal of the position sensor (170). And the circuit board (190) may be electrically connected to the coil (120) and may further include two separate terminals (not shown) for supplying a driving signal to the coil (120).

[0089] The yoke (38) may be placed on the base (210). The yoke (38) may be placed on the first side (42) of the base (210). The yoke (38) may be placed on the base (210) to correspond to or face the magnet (130) in a direction perpendicular to the optical axis direction (e.g., the X-axis direction). The yoke (38) may be coupled to or attached to the circuit board (190). The yoke (38) may be placed on or coupled to the second surface of the circuit board (190).

[0090] At least a portion of the yoke (38) may overlap the magnet (130) in a direction perpendicular to the optical axis direction, for example, in the second direction. An attractive force may act between the yoke (38) and the magnet (130). For example, an attractive force may act between the yoke (38) and the magnet (130) in a direction perpendicular to the optical axis direction, for example, in the second direction. A magnetic circuit may be formed between the yoke (38) and the magnet (130). The yoke (38) may be made of a material that is attracted to a magnet. For example, the yoke (38) may be a magnetic body or a magnetic member. For example, the yoke (38) may be made of a metal material that is attracted to a magnet. Or, for example, the yoke (38) may be made of a magnetic metal material. Or, for example, the yoke (38) may be a magnet.

[0091] Since the yoke (38) is placed on the fixed base (210), the bobbin (110) coupled to the magnet (130) can be pulled toward the yoke (38) by the attractive force acting between the yoke (38) and the magnet (130). The cloud member (33) can be pressed by the bobbin (110) and the base (210) by the interaction between the yoke (38) and the magnet (130). The yoke (38) and the magnet (130) can be a “pressure unit” or a “pressure member”. When the bobbin (110) moves in the optical axis direction by the pressurization unit, contact can be maintained between the bobbin (110) and the cloud member (33) and between the base (210) and the cloud member (33). The attractive force acting between the yoke (38) and the magnet (130) can also be expressed as a holding force that maintains the support of the bobbin (110).

[0092] The cloud member (33) can be arranged between the bobbin (110) and the base (210). The cloud member (33) can also be expressed as a “ball member”, a “ball”, or a “ball bearing”. The cloud member (33) can be in contact with the bobbin (110) and the base (210). The cloud member (33) can perform a rolling movement or a sliding movement between the bobbin (110) and the base (210). The cloud member (33) can support the movement of the bobbin (110) in the optical axis direction. The cloud member (33) can reduce friction between the bobbin (110) and the base (210) when the bobbin (110) is moved in the optical axis direction. The bobbin (110) can be moved in a sliding manner in the optical axis direction by contacting the cloud member (33).

[0093] The cloud member (33) may be made of, but is not limited to, metal, plastic, ceramic, or resin. The cloud member (33) may have a circular shape and may have a diameter sufficient to support movement of the bobbin (110) in the direction of the optical axis.

[0094] The cloud member (33) may be arranged between the outer surface of the bobbin (110) and the inner surface of the base (210). The cloud member (33) may be in contact with the outer surface of the first side (110A) of the bobbin (110) and the inner surface of the first side (42) of the base (210). The cloud member (33) may include ball members (B1 to B6) arranged between the first side (110A) of the bobbin (110) and the first side (42) of the base (210).

[0095] At least a portion of the cloud member (33) may be placed within the receiving groove (17) of the bobbin (110). For example, the cloud member (33) may be placed between the receiving groove (17) of the bobbin (110) and the guide portion (49) of the base (210).

[0096] Referring to FIGS. 7, 10, and 11, the cloud member (33) may include an upper ball member, a lower ball member positioned below the upper ball member, and a middle ball member positioned between the upper ball member and the lower ball member. The upper ball member, the middle ball member, and the lower ball member may be positioned spaced apart from each other in the direction of the optical axis.

[0097] The upper ball member may be positioned higher than the lower ball member in the optical axis direction. Each of the upper ball member, the middle ball member, and the lower ball member may include at least one ball member (or at least one ball). For example, each of the upper ball member, the lower ball member, and the middle ball member may include two or more ball members.

[0098] For example, the upper ball member may include a ball member (B1) positioned on one side of the magnet (130) and a ball member (B4) positioned on the other side of the magnet (130). The middle ball member may include a ball member (B2) positioned on one side of the magnet (130) and a ball member (B5) positioned on the other side of the magnet (130). The lower ball member may include a ball member (B3) positioned on one side of the magnet (130) and a ball member (B6) positioned on the other side of the magnet (130).

[0099] The diameters of the upper ball member, the lower ball member, and the middle ball member may be the same. In other embodiments, the diameter of at least one of the upper ball member, the lower ball member, and the middle ball member may be different from the diameters of the remaining ones of the upper ball member, the lower ball member, and the middle ball member.

[0100] The ball members (e.g., B1, B4) of the upper ball member may be arranged in a line or aligned with each other in a direction perpendicular to the optical axis direction (e.g., the third direction). The ball members (e.g., B2, B5) of the middle ball member may be arranged in a line or aligned with each other in a direction perpendicular to the optical axis direction (e.g., the third direction). The ball members (e.g., B3, B6) of the lower ball member may be arranged in a line or aligned with each other in a direction perpendicular to the optical axis direction (e.g., the third direction).

[0101] In other embodiments, the cloud member may not include either an upper ball member or a lower ball member.

[0102] The cloud member (33) may include first ball members (B1 to B3) arranged on one side of the magnet (130) and second ball members (B4 to B6) arranged on the other side of the magnet (130). The first ball members (B1 to B3) may be arranged to be spaced apart from each other in the optical axis direction or aligned with each other. The second ball members (B4 to B6) may be arranged to be spaced apart from each other in the optical axis direction or aligned with each other. In FIG. 5, the number of first ball members (or second ball members) is three, but in other embodiments, the number of first ball members (or second ball members) may be two or four or more.

[0103] In Fig. 7, the cloud member (33) includes six balls (B1 to B6), but the number of balls is not limited thereto, and in other embodiments, the cloud member (33) may include two to five, or seven or more balls. The embodiment includes an upper ball member (e.g., B1, B4), a lower ball member (B3, B6), and a middle ball member (B2, B5), thereby stably supporting the bobbin (110) during AF operation and preventing or suppressing tilting of the bobbin (110). As a result, the embodiment can secure accuracy and reliability of the AF operation.

[0104] By the force of attraction acting between the yoke (38) and the magnet (130), the cloud member (33) can be pressed by the bobbin (110) or / and the base (210), and can stably support the bobbin (110).

[0105] Referring to FIGS. 10 and 11, in order to reliably secure the tilt prevention effect of the bobbin (110), the upper ball member (e.g., B1, B4) may be positioned between the uppermost end of the bobbin (110) and the first point (P11). For example, the uppermost end of the bobbin (110) may be the upper surface of the bobbin (110) or the uppermost end of the first side (110A) of the bobbin (110). For example, the lowermost end (11A, 11B) of the upper ball member (e.g., B1, B4) may be positioned higher than the first point (P11) or may have the same height as the first point (P11).

[0106] The first point (P11) may be a point that is 80 percent of the total length (H1) of the magnet (130) in the optical axis direction from the lowest end of the magnet (130). Alternatively, the first point (P11) may be a point that is positioned higher than the lowest end of the magnet (130) by a length that is 80 percent of the total length (H1) of the magnet (130) in the optical axis direction.

[0107] In addition, in order to reliably secure the tilt prevention effect of the bobbin (110), the lower ball member (e.g., B3, B6) may be positioned between the lowest end of the bobbin (110) and the second point (P12). For example, the lowest end of the bobbin (110) may be the lower surface of the bobbin (110) or the lowest end of the first side (110A) of the bobbin (110). For example, the upper end (11C, 11D) of the lower ball member (e.g., B3, B6) may be positioned lower than the second point (P12) or may have the same height as the second point (P12).

[0108] The second point (P12) may be a point that is 20 percent of the total length (H1) of the magnet (130) from the lowest end of the magnet (130). Alternatively, the second point (P12) may be a point that is positioned higher than the lowest end of the magnet (130) by a length that is 20 percent of the total length (H1) of the magnet (130) in the optical axis direction.

[0109] If the lowermost end (11A, 11B) of the upper ball member (e.g., B1, B4) is positioned lower than the first point (P11), the gap between the upper ball member (e.g., B1, B4) and the middle ball member (e.g., B2, B5) becomes too small, so that the bobbin (110) cannot be stably supported during AF operation, and thus the tilt prevention effect of the bobbin (110) may be minimal. In addition, if the uppermost end (11C, 11D) of the lower ball member (e.g., B3, B6) is positioned higher than the second point (P1), the gap between the lower ball member (e.g., B3, B6) and the middle ball member (e.g., B2, B5) becomes too small, so that the bobbin (110) cannot be stably supported during AF operation, and thus the tilt prevention effect of the bobbin (110) may be minimal.

[0110] For example, the uppermost end of the upper ball member (e.g., B1, B4) may be positioned higher than the uppermost end of the magnet (130). The lowermost end of the lower ball member (e.g., B3, B6) may be positioned lower than the lowermost end of the magnet (130). The middle ball member (e.g., B2, B5) may be positioned between the uppermost and lowermost ends of the magnet (130).

[0111] Or, for example, the upper ball member (e.g., B1, B4) may be positioned higher than the upper end or upper surface of the magnet (130). The lower ball member (e.g., B3, B6) may be positioned lower than the lower end or lower surface of the magnet (130). For example, the lower end (11A, 11B) of the upper ball member (e.g., B1, B4) may be positioned higher than the upper end or upper surface of the magnet (130) in the optical axis direction. The lower end (11A, 11B) of the lower ball member (e.g., B3, B6) may be positioned lower than the lower end or lower surface of the magnet (130) in the optical axis direction. The middle ball member (e.g., B2, B5) may be positioned between the upper ball member (e.g., B1, B4) and the lower ball member (e.g., B3, B6).

[0112] The cloud member (33) may not overlap with the magnet (130) in the direction of the optical axis. The upper ball member (B1, B4) may not overlap with the magnet (130) in a direction perpendicular to the optical axis (e.g., the third direction (Y-axis direction)). The lower ball member (B3, B6) may not overlap with the magnet (130) in a direction perpendicular to the optical axis (e.g., the third direction (Y-axis direction)). At least a portion of the middle ball member (B2, B5) may overlap with the magnet (130) in a direction perpendicular to the optical axis (e.g., the third direction (Y-axis direction)). The middle ball member (e.g., B2, B5) may be arranged to overlap with a middle portion of the magnet (130). For example, the intermediate ball member (e.g., B2, B5) may be arranged to overlap with the middle portion of the magnet (130) in the third direction (Y-axis direction). For example, the intermediate ball member (e.g., B2, B5) may be arranged to overlap with the boundary surface (or partition) of the N pole and S pole of the magnet (130) in the direction perpendicular to the optical axis (e.g., Y-axis direction).

[0113] In another embodiment, at least a portion of the upper ball member (e.g., B1, B4) may overlap with the magnet (130) in a direction perpendicular to the optical axis direction (e.g., a third direction). For example, at least a portion of the upper ball member (e.g., B1, B4) may overlap with one of the two polarities (e.g., a north pole and a south pole) of the magnet (130) in a direction perpendicular to the optical axis direction (e.g., a third direction). For example, at least a portion of the upper ball member (e.g., B1, B4) may overlap with a first portion of the magnet (130) in a direction perpendicular to the optical axis direction. In this case, the first portion of the magnet (130) may be an area between the uppermost end of the magnet (130) and a first point (P11) of the magnet (130).

[0114] At least a portion of the lower ball member (e.g., B3, B6) may overlap with the magnet (130) in a direction perpendicular to the optical axis direction (e.g., a third direction). For example, at least a portion of the lower ball member (e.g., B3, B6) may overlap with the other of the two polarities (e.g., the N pole and the S pole) of the magnet (130) in a direction perpendicular to the optical axis direction (e.g., a third direction). For example, at least a portion of the lower ball member (e.g., B3, B6) may overlap with a second portion of the magnet (130) in a direction perpendicular to the optical axis direction. In this case, the second portion of the magnet (130) may be an area between the lowermost end of the magnet (130) and a second point (P12) of the magnet (130).

[0115] In another embodiment, the intermediate ball member (B2, B6) may overlap at least one of the two poles (e.g., the N pole and the S pole) of the magnet (130) and the boundary surface (or partition) between the N pole and the S pole in a direction perpendicular to the optical axis direction (e.g., the third direction). For example, the intermediate ball member (B2, B6) may overlap all of the N pole, the S pole, and the boundary surface between the N pole and the S pole of the magnet (130) in a direction perpendicular to the optical axis direction (the third direction). Or, for example, the intermediate ball member (B2, B6) may overlap any one of the N pole and the S pole of the magnet (130) and the boundary surface between the N pole and the S pole in a direction perpendicular to the optical axis direction (the third direction).

[0116] In an embodiment, in order to minimize the tilt of the bobbin (110) during AF operation, ball members (B1 to B7) may be arranged in individual grooves (7A to 7F) of the bobbin (110). The ball member (e.g., B1) may roll or slide within the groove (e.g., 7A) of the bobbin (110) corresponding to the ball member (e.g., B1), and a plurality of different preset points of the bobbin (110) may be supported by the plurality of ball members (B1 to B6). That is, the portions of the bobbin (110) supported by the ball members may be fixed and not change even if the bobbin (110) moves in the optical axis direction. Accordingly, in the embodiment, a plurality of stable support points of the bobbin (110) may be secured during AF operation, and the tilt of the bobbin (110) may be prevented.

[0117] The cover member (300) can accommodate the bobbin (110). In addition, the cover member (300) can accommodate at least a portion of the base (210). The cover member (300) can be in the shape of a box having an open bottom and including an upper plate (301) and a side plate (302). The side plate (302) of the cover member (300) can extend downward from the upper plate (301) of the cover member (300). The shape of the upper plate (301) of the cover member (300) can match the shape of the bobbin (110) or the base (210). At least a portion of the upper plate (301) can include a polygon or a curved surface. An opening (303) can be formed in the upper plate (301) of the cover member (300) to expose the lens or lens module (400) to external light.

[0118] In an embodiment, the magnet (130) can be prevented from being detached from the bobbin (110) due to impact by the inclined side (or chamfered surface) of the magnet (130). In addition, in an embodiment, the bonding force between the magnet (130) and the bobbin (110) can be improved by the chamfered surface of the magnet (130) and the mounting portion (112), thereby reducing the amount of adhesive applied between the magnet (130) and the mounting portion (112) of the bobbin (110), and reducing material costs.

[0119] In addition, in the embodiment, the chamfered shape of the mounting portion (112) of the magnet (130) and the bobbin (110) can serve as a position guide for assembling the two, and the assembling of the two can be made easy.

[0120] In the embodiment, the predetermined support points of the bobbin (110) are supported by the upper ball member (B1, B4), the lower ball member (B3, B6) and the middle ball member (B2, B4), so that the frictional force between the bobbin (110) and the cloud member (33) and the base (210) and the cloud member (33) can be reduced during AF operation, tilting of the bobbin (110) can be prevented or suppressed, and the reliability of the AF operation can be increased.

[0121] Fig. 12a shows one embodiment of a cloud member (33) placed on a bobbin (110).

[0122] Referring to Fig. 12a, the cloud member (33) may include a main ball (MB) and a space ball (SB). The diameter (D1) of the main ball (MB) may be larger than the diameter (D2) of the space ball (SB). The main ball (MB) may serve to support the bobbin (110) with respect to the base (210) during AF operation. The main ball (MB) may be brought into contact with both the bobbin (110) and the base (210) by the attractive force between the yoke (38) and the magnet (130).

[0123] The space ball (SB) can absorb shock, disperse shock, and auxiliary support the bobbin (110) when receiving an external impact. The space ball (SB) does not necessarily come into contact with the bobbin (110) and the base (210) due to the attractive force between the yoke (38) and the magnet (130). For example, the space ball (SB) may come into contact with either the bobbin (110) or the base (210).

[0124] In the embodiment of Fig. 12a, each of the upper ball member and the lower ball member may be a main ball, and the middle ball member may be a space ball (SB). Due to this arrangement, the bobbin (110) can be stably supported by the main balls (MB), external impact can be dispersed by the space ball (SB), and the bobbin (110) can be auxiliary supported.

[0125] Fig. 12b shows another embodiment of a cloud member (33) placed on a bobbin (110).

[0126] Referring to FIG. 12b, the cloud member (33) may include main balls (MB) and space balls (SB) that are alternately arranged in the optical axis direction and in a direction perpendicular to the optical axis direction (e.g., a third direction).

[0127] For example, the first ball members (B1 to B3) may include main balls (MB) and space balls (SB) that are alternately arranged in the optical axis direction. The second ball members (B4 to B6) may include main balls (MB) and space balls (SB) that are alternately arranged in the optical axis direction.

[0128] The main balls (MB) of the first ball members can correspond to or be aligned with the space balls (SB) of the second ball members in a direction perpendicular to the optical axis direction (e.g., the third direction), and the space balls (SB) of the first ball members can correspond to or be aligned with the main balls (MB) of the second ball members in a direction perpendicular to the optical axis direction (e.g., the third direction). Due to the arrangement of Fig. 12b, stable three-point support of the bobbin (110) by the main balls (MB) can be performed, and external impact can be evenly distributed by the space balls (SB) arranged alternately with the main balls (MB).

[0129] Fig. 12c shows another embodiment of a cloud member (33) placed on a bobbin (110).

[0130] Referring to FIG. 12c, the upper ball member may be placed on either one side or the other side of the magnet (130). The middle ball member may be placed on the other side of the magnet (130). The lower ball member may be placed on either one side or the other side of the magnet (130).

[0131] That is, in the embodiment of Fig. 12b, the space ball (SP) can be omitted, and stable three-point support of the bobbin (110) can be performed only by the main ball (MB). In Fig. 12c, grooves (7B, 7D, 7F) are illustrated, but in other embodiments, the grooves (7B, 7D, 7F) may be omitted.

[0132] Autofocus cameras used in automotive and robotics applications require large lenses to achieve high resolution. Moving these large lenses necessitates large drive magnets. As the drive magnets increase in size, the amount of adhesive required to attach them to the bobbin also increases. Furthermore, because the drive magnets are so large, adhesive alone can potentially detach them from the bobbin.

[0133] In an embodiment, by combining a magnet (130) having an inclined side (or chamfered surface) with a mounting portion (112) of a bobbin (110), the bonding force between the magnet (130) and the bobbin (110) can be improved, and detachment of the magnet (130) from the bobbin (110) due to impact can be prevented. This can reduce the amount of adhesive applied between the magnet (130) and the mounting portion (112) of the bobbin (110), thereby reducing material costs.

[0134] In addition, in the embodiment, the bobbin (110) and the magnet (130) can be stably connected together without increasing the size of the bobbin (110) by combining the side surfaces (112B2, 112B3) of the inclined mounting portion (112) and the inclined side surfaces (8C, 8D) of the magnet (130).

[0135] In addition, in the embodiment, the upper ball members (B1, B4), the lower ball members (B3, B6), and the middle ball members (B2, B5) can stably support the bobbin (110) by making contact with the individual grooves (7A to 7F) of the bobbin (110), thereby preventing or suppressing the tilt of the bobbin (110) during AF operation. In particular, as the movement range (or stroke range) of the bobbin in the optical axis direction increases, the possibility of the bobbin tilting during AF operation increases, but the embodiment has the effect of preventing and suppressing the tilt of the bobbin even during AF operation with a large stroke.

[0136] Meanwhile, the lens driving device according to the above-described embodiment can be used in various fields, for example, a camera module or an optical device.

[0137] For example, the lens driving device (100) according to the embodiment may be included in an optical instrument that forms an image of an object in space by using the characteristics of light such as reflection, refraction, absorption, interference, and diffraction, and aims to increase the visual acuity of the eye, or to record and reproduce an image by a lens, or to optically measure, propagate or transmit an image, etc. For example, the optical device according to the embodiment may be a mobile phone, a cell phone, a smart phone, a portable terminal, a portable smart device, a digital camera, a laptop computer, a digital broadcasting terminal, a PDA (Personal Digital Assistants), a PMP (Portable Multimedia Player), a navigation system, etc., but is not limited thereto, and any device for taking a video or a photograph may be used.

[0138] Fig. 13 shows an exploded perspective view of a camera device (200) according to an embodiment.

[0139] Referring to FIG. 13, the camera device (200) may include a lens module (400), a lens driving device (100), and an image sensor (810). The camera device (200) may further include a circuit board (800) electrically connected to the lens driving device (100).

[0140] The camera device (200) may further include a filter (600) positioned between the lens module (400) and the image sensor (810). For example, the filter (600) may be disposed on or attached to the base (210). The base (210) may be coupled, attached, or fixed to the upper surface of the circuit board (800) by an adhesive (not shown). In another embodiment, the camera device (200) may further include a “sensor base” disposed between the base (210) and the circuit board (800), and the filter (600) may be disposed on or coupled to the sensor base. The camera device (200) may further include a control unit (not shown) electrically connected to the circuit board (800). In this case, the control unit may also be electrically connected to the position sensor (170).

[0141] The lens module (400) may include a lens and / or a lens barrel. It may be mounted on or coupled to the bobbin (110) of the lens driving device (100). For example, the lens module (400) may include one or more lenses and a lens barrel that accommodates one or more lenses. Light passing through the lens module (400) may pass through a filter (600) and be irradiated to the image sensor (810).

[0142] The filter (600) may serve to block light of a specific frequency band from passing through the lens barrel (400) from entering the image sensor (810). For example, the filter (600) may be an infrared blocking filter, but is not limited thereto.

[0143] The circuit board (800) may be placed at the bottom of the lens driving device (100). The circuit board (800) may be electrically connected to the circuit board (190) of the lens driving device (100). The circuit board (800) may include terminals (801) that are electrically connected to the terminals (P1 to P4) of the circuit board (190) of the lens driving device (100). For example, the terminals (P1 to P4) of the circuit board (190) and the terminals (801) of the circuit board (800) may be connected to each other by solder or a conductive adhesive.

[0144] The image sensor (810) may be arranged or mounted on the circuit board (800). The image sensor (810) may receive an image included in light incident through the lens driving device (100) and convert the received image into an electrical signal. The image sensor (810) may be positioned so that its optical axis is aligned with the lens module (400). Through this, the image sensor (810) may obtain light passing through the lens module (400). The image sensor (810) may output the irradiated light as an image. The image sensor (810) may be, for example, a CCD (charge coupled device), a MOS (metal oxide semiconductor), a CPD, and a CID. However, the type of the image sensor is not limited thereto. The lens module (400), the image sensor (810), and the filter (600) may be arranged to be spaced apart from each other so as to face each other in the first direction.

[0145] Fig. 14 shows a perspective view of an optical device (200A) according to an embodiment, and Fig. 15 shows a configuration diagram of the optical device (200A) shown in Fig. 14.

[0146] Referring to FIGS. 14 and 15, the optical device (200A) may include a body (850), a wireless communication unit (710), an A / V input unit (720), a sensing unit (740), an input / output unit (750), a memory unit (760), an interface unit (770), a control unit (780), and a power supply unit (790).

[0147] The body (850) illustrated in Fig. 14 is in the form of a bar, but is not limited thereto, and may have various structures such as a slide type, folder type, swing type, or swivel type in which two or more sub-bodies are connected to enable relative movement.

[0148] The body (850) may include a case (casing, base, cover, etc.) that forms the exterior. For example, the body (850) may be divided into a front case (851) and a rear case (852). Various electronic components of the terminal may be built into the space formed between the front case (851) and the rear case (852).

[0149] The wireless communication unit (710) may be configured to include one or more modules that enable wireless communication between the optical device (200A) and a wireless communication system or between the optical device (200A) and a network in which the optical device (200A) is located. For example, the wireless communication unit (710) may be configured to include a broadcast reception module (711), a mobile communication module (712), a wireless Internet module (713), a short-range communication module (714), and a location information module (715).

[0150] The A / V (Audio / Video) input unit (720) is for inputting audio signals or video signals and may include a camera (721) and a microphone (722), etc. The camera (721) may include a camera device (200) according to an embodiment.

[0151] The sensing unit (740) can detect the current state of the optical device (200A), such as the open / close state of the optical device (200A), the position of the optical device (200A), the presence or absence of user contact, the orientation of the optical device (200A), acceleration / deceleration of the optical device (200A), and generate a sensing signal to control the operation of the optical device (200A). For example, if the optical device (200A) is in the form of a slide phone, it can sense whether the slide phone is open or closed. In addition, it is responsible for sensing functions related to whether power is supplied to the power supply unit (790), whether the interface unit (770) is connected to an external device, and the like.

[0152] The input / output unit (750) is for generating input or output related to visual, auditory, or tactile senses. The input / output unit (750) can generate input data for controlling the operation of the optical device (200A) and can also display information processed in the optical device (200A).

[0153] The input / output unit (750) may include a key pad unit (730), a display module (751), an audio output module (752), and a touch screen panel (753). The key pad unit (730) may generate input data through key pad input.

[0154] The display module (751) may include a plurality of pixels whose colors change according to an electrical signal. For example, the display module (751) may include at least one of a liquid crystal display, a thin film transistor-liquid crystal display, an organic light-emitting diode, a flexible display, and a 3D display.

[0155] The audio output module (752) can output audio data received from the wireless communication unit (710) in a call signal reception mode, call mode, recording mode, voice recognition mode, or broadcast reception mode, or can output audio data stored in the memory unit (760).

[0156] The touch screen panel (753) can convert a change in electrostatic capacity caused by a user's touch on a specific area of ​​the touch screen into an electrical input signal.

[0157] The memory unit (760) may store programs for processing and controlling the control unit (780), and may temporarily store input / output data (e.g., phone book, messages, audio, still images, photographs, videos, etc.). For example, the memory unit (760) may store images captured by the camera (721), such as photographs or videos.

[0158] The interface unit (770) serves as a passage connecting to an external device connected to the optical device (200A). The interface unit (770) receives data from the external device, supplies power, and transmits it to each component inside the optical device (200A), or allows data inside the optical device (200A) to be transmitted to the external device. For example, the interface unit (770) may include a wired / wireless headset port, an external charger port, a wired / wireless data port, a memory card port, a port for connecting a device equipped with an identification module, an audio I / O (Input / Output) port, a video I / O (Input / Output) port, and an earphone port.

[0159] The control unit (controller, 780) can control the overall operation of the optical device (200A). For example, the control unit (780) can perform related control and processing for voice calls, data communications, video calls, etc.

[0160] The control unit (780) may be equipped with a multimedia module (781) for multimedia playback. The multimedia module (781) may be implemented within the control unit (780) or may be implemented separately from the control unit (780).

[0161] The control unit (780) can perform pattern recognition processing to recognize handwriting input or drawing input performed on the touch screen as characters and images, respectively.

[0162] The power supply unit (790) can supply power required for the operation of each component by receiving external power or internal power under the control of the control unit (780).

[0163] The features, structures, effects, etc. described in the embodiments above are included in at least one embodiment of the present invention, and are not necessarily limited to just one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by those skilled in the art to which the embodiments pertain. Therefore, the contents related to such combinations and modifications should be construed as being included within the scope of the present invention.

[0164] The embodiment can be used in a lens driving device and a camera device and an optical device that can prevent tilt of a bobbin during autofocus operation and suppress detachment of a magnet from the bobbin.

Claims

1. Base; A bobbin arranged spaced apart from the above base; A magnet placed on the above bobbin; A coil disposed on the base and moving the bobbin in the optical axis direction by interaction with the magnet; and Including a cloud member arranged between the bobbin and the base, The above cloud absence is, An upper ball member positioned between the first point and the uppermost end of the bobbin; A lower ball member positioned between the second point and the lowermost end of the bobbin; and Including an intermediate ball member arranged between the upper ball member and the lower ball member, A lens driving device wherein the first point is a point that is 80 percent of the total length of the magnet in the direction of the optical axis from the lowest end of the magnet, and the second point is a point that is 20 percent of the total length of the magnet from the lowest end of the magnet.

2. In paragraph 1, A lens driving device in which the upper ball member is positioned higher than the uppermost part of the magnet.

3. In paragraph 1, A lens driving device in which the lower ball member is positioned lower than the lowest end of the magnet.

4. In paragraph 1, A lens driving device in which at least a portion of the upper ball member overlaps the magnet in a direction perpendicular to the optical axis direction.

5. In paragraph 1, A lens driving device in which at least a portion of the lower ball member overlaps the magnet in a direction perpendicular to the optical axis direction.

6. In paragraph 1, The magnet includes a north pole and a south pole facing each other in the optical axis direction and a boundary surface between the north pole and the south pole, A lens driving device in which the above intermediate ball member overlaps the boundary surface of the magnet in a direction perpendicular to the optical axis direction.

7. In paragraph 1, The above bobbin includes a receiving groove for arranging the cloud member, A lens driving device in which the above-mentioned receiving grooves are spaced apart from each other and include a plurality of grooves corresponding to the upper ball member, the middle ball member, and the lower ball member.

8. In paragraph 1, The magnet includes a first surface facing the coil, a second surface opposite the first surface, a third surface connecting one side of the first surface and one side of the second surface, and a fourth surface connecting the other side of the first surface and the other side of the second surface. The magnet includes a portion whose length in a direction parallel to the first surface decreases as it moves from the second surface toward the first surface, A lens driving device in which the bobbin includes a mounting portion for accommodating the magnet.

9. In paragraph 1, a circuit board disposed on the base and electrically connected to the coil; and A lens driving device including a yoke disposed on the base and facing the magnet in a direction perpendicular to the optical axis direction and having an attractive force with the magnet.

10. In paragraph 1, The upper ball member, the middle ball member, and the lower ball member are arranged on the outer surface of the first side of the bobbin facing the coil, The upper ball member includes a first ball member positioned on one side of the magnet and a second ball member positioned on the other side of the magnet, The above intermediate ball member includes a third ball member arranged on one side of the magnet and a fourth ball member arranged on the other side of the magnet, A lens driving device in which the lower ball member includes a fifth ball member arranged on one side of the magnet and a sixth ball member arranged on the other side of the magnet.

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