KR20240057279A - A lens driving device, a camera device and an optical apparatus - Google Patents

Abstract

This embodiment includes a fixing unit; A moving part disposed within the fixed part; A coil disposed on the fixing part; a first magnet disposed on the moving unit and interacting with the coil; a second magnet disposed on the fixing part; and a ball disposed between the fixed part and the moving part, wherein the second magnet presses the first magnet so that the ball is pressed between the fixed part and the moving part.

Description

A lens driving device, a camera device and an optical apparatus}

This embodiment relates to a lens driving device, a camera device, and an optical device.

A camera device is a device that takes photos or videos of a subject, and is mounted on optical devices such as smartphones, drones, vehicles, etc.

Camera devices are equipped with an autofocus function that automatically adjusts focus depending on the distance to the subject. The autofocus function is performed as the lens moves in the optical axis direction with respect to the image sensor, and the movement of the lens in the optical axis direction may be guided by a ball. At this time, the attractive force between the magnet and the yoke can be used to hold the ball between the fixed part and the moving part.

However, in this case, a problem may occur where the lens rolls due to moment generated by the ball.

(Patent Document 1) KR 10-2015-0118005 A

This embodiment seeks to provide a lens driving device that minimizes the moment generated by the ball.

This embodiment seeks to provide a lens driving device in which lens rolling or rotation phenomenon is minimized.

This embodiment seeks to provide a lens driving device whose size in the horizontal direction is reduced by the thickness of the yoke.

This embodiment seeks to provide a lens driving device that can place the ball in various positions, such as the center of gravity of the moving part or the opposite side of the driving magnet, as needed.

The lens driving device according to this embodiment includes a fixing part; A moving part disposed within the fixed part; A coil disposed on the fixing part; a first magnet disposed on the moving unit and interacting with the coil; a second magnet disposed on the fixing part; and a ball disposed between the fixed part and the moving part, wherein the second magnet can press the first magnet so that the ball is pressed between the fixed part and the moving part.

When current is applied to the coil, the first magnet may move in the optical axis direction.

The coil may overlap the first magnet in a first axis direction perpendicular to the optical axis direction, and the second magnet may overlap the first magnet in the first axis direction.

The second magnet may include a first part that overlaps the first magnet in the first axis direction, and a second part that does not overlap the first magnet in the first axis direction.

The second magnet may overlap the coil in a second axis direction perpendicular to the optical axis direction and the first axis direction.

The second magnet may include a first unit magnet disposed on one side of the coil and a second unit magnet disposed on the other side of the coil.

The second magnet may be arranged to generate a repulsive force with the first magnet.

The first magnet includes a first magnet part including an N pole and an S pole, a second magnet part including an S pole and an N pole, and a neutral part disposed between the first magnet part and the second magnet part. It can be included.

The second magnet includes a first magnet portion including an N pole and an S pole, a second magnet portion including an S pole and an N pole, the first magnet portion of the second magnet, and the magnet portion of the second magnet. It includes a neutral part disposed between the second magnet parts, wherein the N pole of the first magnet part of the second magnet faces the N pole of the first magnet part of the first magnet, and the N pole of the first magnet part of the second magnet faces the N pole of the first magnet part of the second magnet. The S pole of the second magnet portion may face the S pole of the second magnet portion of the first magnet.

In the optical axis direction, the length of the neutral portion of the second magnet may be longer than the length of the neutral portion of the first magnet.

When the first magnet moves downward in the direction of the optical axis as much as possible, the first boundary between the first magnet portion of the first magnet and the neutral portion of the first magnet is the first boundary between the first magnet portion of the second magnet. It may be arranged at a height equal to or lower than the first boundary between the neutral part of the second magnet and the second magnet.

When the first magnet moves as far as possible upward in the optical axis direction, the second boundary between the second magnet portion of the first magnet and the neutral portion of the first magnet is the second boundary between the second magnet portion of the second magnet. It may be arranged at a height equal to or higher than the second boundary between the neutral part of the second magnet and the second magnet.

In the optical axis direction, the length of the second magnet is longer than the length of the first magnet, and in the optical axis direction, the length of the first magnet portion of the second magnet is shorter than the length of the first magnet portion of the first magnet. You can.

Fixing unit according to this embodiment; A moving part disposed within the fixed part; A coil disposed on the fixing part; a magnet disposed on the moving unit and interacting with the coil; and a ball disposed between the fixing part and the moving part, wherein the fixing part includes a first side wall on which the coil is disposed, a second side wall disposed on an opposite side of the first side wall, and the first side wall is the and a protrusion disposed to overlap between the first side wall and the second side wall in a first direction toward the second side wall, and in the first direction, the moving part is between the first side wall of the fixing unit and the protrusion. and a protrusion disposed on, and the ball may be disposed between the protrusion of the moving part and the protrusion of the fixed part.

The camera device according to this embodiment includes a printed circuit board; an image sensor disposed on the printed circuit board; a lens driving device disposed on the printed circuit board; And it may include a lens coupled to the lens driving device.

The optical device according to this embodiment includes a main body; a camera device disposed on the main body; and a display disposed on the main body and outputting at least one of a video and an image captured by the camera device.

Through this embodiment, the moment generated by the ball can be minimized. Through this, rolling, or rotation, of the lens can be minimized.

Through this embodiment, the size of the lens driving device in the horizontal direction can be reduced by the thickness of the yoke.

Through this embodiment, the ball can be placed in various locations, such as the center of gravity of the moving part or the opposite side of the driving magnet, as needed, so design freedom can be improved. More specifically, the ball may be placed on a virtual plane that passes through the center of gravity of the moving part and is parallel to the inner surface of the magnet.

1 is a perspective view of a lens driving device according to this embodiment.
Figure 2 is a cross-sectional view seen from AA in Figure 1.
Figure 3 is a cross-sectional perspective view of the lens driving device according to this embodiment.
Figure 4 is a cross-sectional view seen from BB in Figure 1.
Figures 5 and 6 are cross-sectional perspective views of the lens driving device according to this embodiment.
Figure 7 is a cross-sectional view of the lens driving device according to this embodiment cut perpendicular to the optical axis and viewed from above.
Figure 8 is an exploded perspective view of the lens driving device according to this embodiment.
Figure 9 is an exploded perspective view seen from a different direction than Figure 8.
Figure 10 is a perspective view of the lens driving device according to this embodiment with the cover removed.
Figure 11 is a plan view of the lens driving device according to this embodiment with the cover removed.
Figure 12 is a bottom perspective view of the lens driving device according to this embodiment with the cover removed.
Figure 13 is a partial perspective view of the lens driving device according to this embodiment with the cover removed.
Figure 14 is a perspective view showing the fixing part and related configuration of the lens driving device according to this embodiment.
Figure 15 is a partially enlarged view of Figure 14 seen from another direction.
Figure 16 is a perspective view showing the moving part and related configuration of the lens driving device according to this embodiment.
Figure 17 is a perspective view seen from a different direction than Figure 16.
Figure 18 is a perspective view showing the magnet, coil, and related configuration of the lens driving device according to this embodiment.
FIG. 19 is a perspective view with the driving magnet omitted from FIG. 18.
Figure 20 is a top view of Figure 18.
Figure 21 is a diagram showing a driving magnet and a repulsive force magnet of the lens driving device according to this embodiment. (a) is a diagram showing the driving magnet and the repulsive force magnet before the driving magnet moves, that is, in the initial state. (b) is a diagram showing the driving magnet and the repulsive force magnet when the driving magnet is maximally moved upward in the optical axis direction. (c) is a diagram showing the driving magnet and the repulsive force magnet when the driving magnet is maximally moved downward in the optical axis direction.
Figure 22 is a conceptual diagram conceptually showing how the ball is pressed by the repulsive force between the driving magnet and the repulsive force magnet in this embodiment.
23 to 25 are diagrams for explaining autofocus driving of the lens driving device according to this embodiment. Figure 23 is a cross-sectional view showing the moving part in the initial state in which no current is applied to the coil. Figure 24 is a cross-sectional view showing the moving part moving upward in the optical axis direction when a forward current is applied to the coil. Figure 25 is a cross-sectional view showing the moving part moving downward in the optical axis direction when a reverse current is applied to the coil.
Figure 26 is an exploded perspective view of the camera device according to this embodiment.
Figure 27 is a perspective view of an optical device according to this embodiment.
Figure 28 is a perspective view of an optical device according to a modified example.

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

However, the technical idea of the present invention is not limited to some of the described embodiments, but may be implemented in various different forms, and as long as it is within the scope of the technical idea of the present invention, one or more of the components may be optionally used between the embodiments. It can be used by combining or replacing.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention, unless explicitly specifically defined and described, are generally understood by those skilled in the art to which the present invention pertains. It can be interpreted as meaning, and the meaning of commonly used terms, such as terms defined in a dictionary, can be interpreted by considering the contextual meaning of the related technology.

Additionally, the terms used in the embodiments of the present invention are for 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 described as "at least one (or more than one) of A and B and C", it is combined with A, B, and C. It can contain one or more of all possible combinations.

Additionally, in describing the components of the embodiments of the present invention, terms such as first, second, A, B, (a), and (b) may be used. These terms are only used to distinguish the component from other components, and are not limited to the essence, sequence, or order of the component.

And, when a component is described as being 'connected', 'coupled', or 'connected' to another component, that component is directly 'connected', 'coupled', or 'connected' to that other component. In addition to cases, it may also include cases where the component is 'connected', 'coupled', or 'connected' by another component between that component and that other component.

Additionally, when described as being formed or disposed “on top” or “bottom” of each component, “top” or “bottom” means that the two components are directly adjacent to each other. This includes not only the case of contact, but also the case where one or more other components are formed or disposed between the two components. In addition, when expressed as “top” or “bottom,” the meaning of not only the upward direction but also the downward direction can be included based on one component.

The 'Optical Axis (see OA in FIG. 23) direction' used below is defined as the optical axis direction of the lens and/or image sensor coupled to the lens driving device.

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'.

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

Hereinafter, one of the “x-axis” and “y-axis” may be referred to as the “first axis” and the other may be referred to as the “second axis.”

Hereinafter, one of the “driving magnet 310” and the “repulsive force magnet 500” may be referred to as the “first magnet” and the other may be referred to as the “second magnet.”

Hereinafter, one of the “lower magnet portion 311” and the “upper magnet portion 312” may be referred to as the “first magnet portion” and the other may be referred to as the “second magnet portion.”

Hereinafter, one of the “lower magnet unit 510” and the “upper magnet unit 520” may be referred to as the “first magnet unit” and the other may be referred to as the “second magnet unit.”

Hereinafter, the configuration of the lens driving device according to this embodiment will be described with reference to the drawings.

1 is a perspective view of a lens driving device according to this embodiment. Figure 2 is a cross-sectional view taken along line A-A of Figure 1. Figure 3 is a cross-sectional perspective view of the lens driving device according to this embodiment. Figure 4 is a cross-sectional view taken along B-B in Figure 1. Figures 5 and 6 are cross-sectional perspective views of the lens driving device according to this embodiment. Figure 7 is a cross-sectional view of the lens driving device according to this embodiment cut perpendicular to the optical axis and viewed from above. Figure 8 is an exploded perspective view of the lens driving device according to this embodiment. Figure 9 is an exploded perspective view seen from a different direction than Figure 8. Figure 10 is a perspective view of the lens driving device according to this embodiment with the cover removed. Figure 11 is a plan view of the lens driving device according to this embodiment with the cover removed. Figure 12 is a bottom perspective view of the lens driving device according to this embodiment with the cover removed. Figure 13 is a partial perspective view of the lens driving device according to this embodiment with the cover removed. Figure 14 is a perspective view showing the fixing part and related configuration of the lens driving device according to this embodiment. Figure 15 is a partially enlarged view of Figure 14 seen from another direction. Figure 16 is a perspective view showing the moving part and related configuration of the lens driving device according to this embodiment. Figure 17 is a perspective view seen from a different direction than Figure 16. Figure 18 is a perspective view showing the magnet, coil, and related configuration of the lens driving device according to this embodiment. FIG. 19 is a perspective view with the driving magnet omitted from FIG. 18. Figure 20 is a top view of Figure 18. Figure 21 is a diagram showing a driving magnet and a repulsive force magnet of the lens driving device according to this embodiment. (a) is a diagram showing the driving magnet and the repulsive force magnet before the driving magnet moves, that is, in the initial state. (b) is a diagram showing the driving magnet and the repulsive force magnet when the driving magnet is maximally moved upward in the optical axis direction. (c) is a diagram showing the driving magnet and the repulsive force magnet when the driving magnet is maximally moved downward in the optical axis direction. Figure 22 is a conceptual diagram conceptually showing how the ball is pressed by the repulsive force between the driving magnet and the repulsive force magnet in this embodiment.

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. The lens driving device 10 may include an AF actuator.

The lens driving device 10 may include a fixing unit 100. The fixing part 100 may be a relatively fixed part when the moving part 200 moves. The moving part 200 can move with respect to the fixed part 100 .

The lens driving device 10 may include a base 110. The fixing part 100 may include a base 110. The base 110 may be placed below the holder 210. Base 110 may be combined with cover 130. Holder 210 may be placed on base 110. The holder 210 may be placed on the lower plate 111 of the base 110. Holder 210 may be placed within base 110. The holder 210 may be placed within the side plate 112 of the base 110.

The base 110 may include a lower plate 111. The lower plate 111 of the base 110 may support the lower surface of the moving unit 200. The lower plate 111 of the base 110 may support the lower surface of the holder 210. The lower plate 111 of the base 110 may function as a lower stopper of the moving part 200. The lower plate 111 of the base 110 may function as a lower stopper of the holder 210.

Base 110 may include a side plate 112. The side plate 112 may be a 'side'. The side plate 112 may be a ‘side wall’. The side plate 112 of the base 110 may extend from the upper surface of the lower plate 111. The side plate 112 may include a plurality of side plates. The side plate 112 may include four side plates. The side plate 112 may include first to fourth side plates. The side plate 112 may include a first side plate and a second side plate disposed on opposite sides of each other, and a third side plate and a fourth side plate disposed on opposite sides of each other.

The base 110 may include a pillar portion 113. The pillar portion 113 may extend from the upper surface of the lower plate 111. The pillar portion 113 may extend inward from the side plate 112. A ball 400 may be placed on the pillar portion 113. A groove 114 in which the ball 400 is placed may be formed in the pillar portion 113. The pillar portion 113 may be referred to as a ‘protrusion portion.’

The fixing unit 100 includes a first side wall on which the coil 320 is disposed, a second side wall disposed on the opposite side of the first side wall, and a first side wall and a second side wall in a first direction where the first side wall faces the second side wall. It may include protrusions disposed to overlap between the side walls. At this time, the protrusion may be a pillar portion 113. In the first direction, the moving part 200 may include a protrusion disposed between the first side wall of the fixing part 100 and the protrusion. The ball 400 may be disposed between the protrusion of the moving part 200 and the protrusion of the fixed part 100.

Base 110 may include grooves 114 . The pillar portion 113 may include a groove 114. The groove 114 may be formed in the pillar portion 113. The groove 114 may be a 'ball receiving groove'. A ball 400 may be placed in the groove 114. The groove 114 may be in direct contact with the ball 400. The groove 114 may be arranged in the optical axis direction. Groove 114 may include a plurality of grooves. Groove 114 may include two grooves. The two grooves may be arranged parallel to each other.

Base 110 may include grooves 115 . The groove 115 may be a ‘repulsion magnet receiving groove’. A repulsive force magnet 500 may be placed in the groove 115. The groove 115 may include a shape corresponding to the repulsive force magnet 500. The groove 115 may be formed on the inner surface of the side plate 112 of the base 110. Groove 115 may include a plurality of grooves. Groove 115 may include two grooves.

Base 110 may include steps 116 . The step 116 may be formed at the lower end of the outer surface of the base 110. The step 116 may protrude from the outer surface of the base 110. The side plate 132 of the cover 130 may be disposed on the step 116 of the base 110.

Base 110 may include protrusions 117 . The protrusion 117 may be a ‘substrate bonding protrusion’. The protrusion 117 may be inserted into the hole of the substrate 120. Protrusions 117 may be coupled to the substrate 120 . The protrusion 117 may fix the substrate 120. Protrusions 117 may be formed on the side plate 112. The protrusion 117 may be formed to protrude on the outer surface of the base 110. Protrusion 117 may include a plurality of protrusions. Protrusion 117 may include two protrusions.

One of the “grooves 114” and “grooves 115” of the base 110 may be referred to as a “first groove” and the other may be referred to as a “second groove.”

The lens driving device 10 may include a substrate 120 . The fixing part 100 may include a substrate 120 . The substrate 120 may be placed on the fixing unit 100 . The substrate 120 may be placed on the base 110 . The substrate 120 may be placed on the side plate 112 of the base 110. The substrate 120 may be placed on the cover 130. The substrate 120 may be placed on the side plate 132 of the cover 130. The substrate 120 may be disposed on the inner surface of the side plate 132 of the cover 130. The substrate 120 may be disposed on the outer surface of the side plate 132 of the cover 130. The substrate 120 may be arranged parallel to the optical axis. A coil 320 and a sensor 330 may be disposed on the substrate 120. The substrate 120 may include a printed circuit board. The substrate 120 may include a flexible printed circuit board (FPCB).

The substrate 120 may include a terminal 121. The terminal 121 may be formed at the lower end of the outer surface of the substrate 120. The terminal 121 of the board 120 may be coupled to the printed circuit board 50 of the camera device 10A. The terminal 121 of the board 120 may be electrically connected to the printed circuit board 50 of the camera device 10A. The terminal 121 of the board 120 may be connected to the printed circuit board 50 of the camera device 10A by solder. Terminal 121 may include a plurality of terminals. Terminal 121 may include five terminals. The terminal 121 may include a terminal electrically connected to the sensor 330. The terminal 121 may include a ground terminal for grounding. The terminal 121 may include a terminal electrically connected to the coil 320.

The lens driving device 10 may include a cover 130. The fixing part 100 may include a cover 130. Cover 130 may be placed on base 110. Cover 130 may be placed on base 110. Cover 130 may be coupled to base 110. Cover 130 may be fixed to base 110. The cover 130 can accommodate the holder 210 therein. The cover 130 may be a shield member. The cover 130 may be a shield can.

Cover 130 may include a top plate 131. The upper plate 131 of the cover 130 may function as an upper stopper of the moving unit 200. The upper plate 131 of the cover 130 may function as an upper stopper of the holder 210. The upper plate 131 may be placed on the moving unit 200. The upward movement of the moving part 200 may be limited by the moving part 200 coming into contact with the upper plate 131. The top plate 131 may include a hole through which light passes.

Cover 130 may include a side plate 132. The side plate 132 may extend from the upper plate 131. The side plate 132 may be placed on the base 110. The side plate 132 may be placed on a step 116 protruding from the lower end of the outer surface of the base 110. 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 disposed on opposite sides of each other, and a third side plate and a fourth side plate disposed on opposite sides of each other.

The lens driving device 10 may include a moving unit 200. The moving unit 200 may be disposed on the fixed unit 100 . The moving unit 200 may be disposed within the fixed unit 100 . The moving part 200 may be disposed on the fixed part 100. The moving part 200 may be movably disposed on the fixing part 100 . The moving unit 200 can be moved relative to the fixed unit 100 by the driving unit 300 . The moving unit 200 can move in the optical axis direction with respect to the fixing unit 100 by the driving unit 300. The moving unit 200 can move in the optical axis direction. The moving unit 200 can move during AF operation. A lens may be coupled to the moving unit 200.

The lens driving device 10 may include a holder 210. The moving unit 200 may include a holder 210. The holder 210 may be an 'AF holder'. The holder 210 may be a 'bobbin'. The holder 210 may be a 'carrier'. Holder 210 may be placed within base 110. Holder 210 may be placed on base 110. Holder 210 may be placed within cover 130. The holder 210 may be arranged to be movable. The holder 210 may be arranged to be movable in the optical axis direction.

The holder 210 may include a first part 211. The first part 211 may be disposed between the side plate 112 and the pillar portion 113 of the base 110. A ball 400 may be placed in the first part 211 of the holder 210. A groove 212 in which the ball 400 is placed may be formed in the first part 211 of the holder 210.

Holder 210 may include grooves 212 . The groove 212 may be a 'ball receiving groove'. A ball 400 may be placed in the groove 212. The groove 212 may be in direct contact with the ball 400. The groove 212 may be arranged in the optical axis direction. The groove 212 can guide the ball 400 to move in the optical axis direction. Groove 212 may include a plurality of grooves. Groove 212 may include two grooves. The two grooves may be arranged parallel to each other. The groove 212 of the holder 210 may be arranged to face the groove 114 of the base 110. The ball 400 may be placed between the groove 212 of the holder 210 and the groove 114 of the base 110.

The holder 210 may include a groove 213. The groove 213 may be a ‘driving magnet receiving groove’. The groove 213 may be formed on the outer surface of the holder 210. The groove 213 may be formed concavely on the side of the holder 210. A driving magnet 310 may be placed in the groove 213. The groove 213 may be formed in a shape corresponding to the driving magnet 310. The groove 213 may be recessed to a depth equal to the thickness of the driving magnet 310.

One of the “grooves 212” and “grooves 213” of the holder 210 may be referred to as a “first groove” and the other may be referred to as a “second groove.”

The lens driving device 10 may include a driving unit 300. The driving unit 300 can move the moving unit 200 in the optical axis direction. The driving unit 300 can move the holder 210 in the optical axis direction. The driving unit 300 can move the holder 210 in the optical axis direction through electromagnetic force. The driving unit 300 may include a driving magnet 310 and a coil 320. The driving magnet 310 and the coil 320 can move the moving unit 200 in the optical axis direction.

The lens driving device 10 may include a driving magnet 310. The driving unit 300 may include a driving magnet 310. The driving magnet 310 may be disposed on the moving unit 200. The driving magnet 310 may be placed in the holder 210. The driving magnet 310 may be fixed to the holder 210. The driving magnet 310 may be coupled to the holder 210. The driving magnet 310 may be attached to the holder 210 with adhesive. The driving magnet 310 may be disposed within the cover 130. The driving magnet 310 may be disposed between the coil 320 and the holder 210. The driving magnet 310 may be disposed inside the coil 320. The driving magnet 310 may overlap the coil 320 in a direction perpendicular to the optical axis. The driving magnet 310 may face the coil 320. The driving magnet 310 may face the coil 320. The driving magnet 310 may be disposed at a position corresponding to the coil 320. The driving magnet 310 may interact with the coil 320. The driving magnet 310 may electromagnetically interact with the coil 320. The driving magnet 310 can move. The driving magnet 310 may be movably disposed. The driving magnet 310 can move during AF operation. The driving magnet 310 can move together with the holder 210. The driving magnet 310 can move in the optical axis direction. When current is applied to the coil 320, the driving magnet 310 may move in the optical axis direction.

The driving magnet 310 may be a 4-pole magnet. The driving magnet 310 may include a four-pole magnetized magnet. The driving magnet 310 may include a lower magnet portion 311 including an N pole and an S pole. The driving magnet 310 may include an upper magnet portion 312 including an S pole and an N pole. The driving magnet 310 may include a neutral portion 313 disposed between the lower magnet portion 311 and the upper magnet portion 312.

The upper magnet portion 312 may be disposed on the lower magnet portion 311. The lower magnet portion 311 and the upper magnet portion 312 may be arranged in the optical axis direction. The lower magnet portion 311 and the upper magnet portion 312 may be spaced apart in the optical axis direction. A neutral portion 313 may be disposed between the lower magnet portion 311 and the upper magnet portion 312.

The lens driving device 10 may include a coil 320 . The driving unit 300 may include a coil 320. Coil 320 may be disposed on substrate 120 . The coil 320 may be disposed on the inner surface of the substrate 120. The coil 320 may be disposed on the fixing unit 100. Coil 320 may be placed on base 110. Coil 320 may be placed on cover 130. The coil 320 may be disposed outside the driving magnet 310. The coil 320 may be disposed between the side plate 132 of the cover 130 and the driving magnet 310. Coil 320 may be fixed. The coil 320 may remain fixed even during AF operation. Coil 320 may interact with driving magnet 310. The coil 320 may face the driving magnet 310. The coil 320 may face the driving magnet 310. The coil 320 may be disposed at a position corresponding to the driving magnet 310. The coil 320 may overlap the driving magnet 310 in a direction perpendicular to the optical axis. The coil 320 may overlap the driving magnet 310 in the x-axis direction perpendicular to the optical axis direction.

The lens driving device 10 may include a sensor 330. The driving unit 300 may include a sensor 330. The sensor 330 can detect the driving magnet 310. The sensor 330 may be disposed on the substrate 120 . Sensor 330 may be disposed within coil 320. The sensor 330 may be a Hall sensor. The movement amount or position of the driving magnet 310 detected by the sensor 330 may be used as feedback for autofocus driving.

In a variation, sensor 330 may be a driver IC. The driver IC may include a Hall element that detects the driving magnet 310. The driver IC may include a sensing unit. The sensing unit may include a Hall element (Hall IC). The driver IC may be electrically connected to the coil 320. The driver IC may apply current to the coil 320.

The lens driving device 10 may include a capacitor 340. The driver 300 may include a capacitor 340. The capacitor 340 may be disposed on the substrate 120 . Capacitor 340 may be disposed within coil 320. Capacitor 340 may be placed next to sensor 330. The capacitor 340 may be used to remove noise detected by the sensor 330.

The lens driving device 10 may include a guide member. The guide member may include a ball 400. The guide member may include a shaft. The guide member may include a pin. The guide member may include a cylindrical member. The guide member may guide the movement of the moving part 200 with respect to the fixing part 100 in a specific direction. In a variation, the ball 400 of this embodiment may be replaced with a shaft. In this case, the tilt phenomenon of the moving part 200 can be prevented.

The lens driving device 10 may include a ball 400. The ball 400 may guide the movement of the moving unit 200 relative to the fixed unit 100 in the optical axis direction. The ball 400 may guide the movement of the holder 210 relative to the base 110 in the optical axis direction. The ball 400 may be disposed between the fixed part 100 and the moving part 200. The ball 400 may be placed between the base 110 and the holder 210. The ball 400 may be disposed between the base 110 and the holder 210 in the x-direction. Alternatively, the ball 400 may be placed between the base 110 and the holder 210 in the y direction. The ball 400 may be placed in the groove 114 of the base 110. The ball 400 may be placed in the groove 212 of the holder 210. Ball 400 may be spherical in shape. The ball 400 may be formed of metal. Grease may be applied to the surface of the ball 400.

The distance between the ball 400 and the optical axis may be shorter than the distance between the repulsive force magnet 500 and the optical axis. The distance between the ball 400 and the optical axis may be the same as the distance between the sensor 330 and the optical axis. As a variant example, the distance between the ball 400 and the optical axis may be the same as the distance between the coil 320 and the optical axis. The ball 400 may be arranged to be spaced apart from the side plate 120 of the base 110. When viewed from above, the side plate 120 of the base 110, the first part 211 of the holder 210, the ball 400, the pillar portion 113 of the base 110, and the holder 210 are drawn on an imaginary straight line. ) and the side plate 120 of the base 110 may be arranged in order.

The ball 400 may include a plurality of balls. The ball 400 may include a plurality of unit balls. There are a total of 6 balls 400 and can be provided in 2 sets of 3 balls per set. The ball 400 may include a first ball 410 and a second ball 420. The first ball 410 may be placed on an imaginary straight line connecting the optical axis and the first corner of the base 110. The second ball 410 may be placed on an imaginary straight line connecting the optical axis and the second corner of the base 110. The first corner and the second corner of the base 110 may be placed adjacent to each other. The first ball 410 may be placed on one side of the driving magnet 310. The second ball 420 may be placed on the other side of the driving magnet 310.

When viewed from above, the distance between the first ball 410 and the second ball 420 may be greater than the width of the driving magnet 310.

The lens driving device 10 may include a repulsive force magnet 500. The repulsive force magnet 500 may be disposed on the fixing unit 100. The repulsive force magnet 500 may be fixed to the fixing unit 100. The repulsive force magnet 500 may be coupled to the fixing unit 100. The repulsive force magnet 500 may be attached to the fixing part 100 with adhesive. The repulsive force magnet 500 may be placed on the base 110. The repulsive force magnet 500 may be fixed to the base 110. The repulsive force magnet 500 may be coupled to the base 110. The repulsive force magnet 500 may be attached to the base 110 with adhesive.

The repulsive force magnet 500 may press the driving magnet 310 in the direction of the ball 400. The repulsive force magnet 500 may press the moving part 200 in the direction of the ball 400. The repulsive force magnet 500 may press the holder 210 in the direction of the ball 400. The repulsive force magnet 500 can clamp the ball 400 between the fixed part 100 and the moving part 200 through interaction with the driving magnet 310. A repulsive force may be generated between the repulsive force magnet 500 and the driving magnet 310. The repulsive force magnet 500 may be arranged to generate a repulsive force with the driving magnet 310. The repulsive force magnet 500 may push the driving magnet 310. The repulsive force magnet 500 may be formed so that the ball 400 is held between the fixed part 100 and the moving part 200. The repulsive force magnet 500 may press the driving magnet 310 so that the ball 400 is pressed between the fixed part 100 and the moving part 200.

The repulsive force magnet 500 may be spaced apart from the substrate 120. A gap (see gap in FIG. 20) may be formed between the repulsive force magnet 500 and the substrate 120. As a modified example, the repulsive force magnet 500 may be disposed on the substrate 120.

The repulsive force magnet 500 may overlap the driving magnet 310 in the x-axis direction. A portion of the repulsive force magnet 500 may overlap the driving magnet 310 in the x-axis direction. At least a portion of the repulsive force magnet 500 may overlap the driving magnet 310 in the x-axis direction. The repulsive force magnet 500 may include a first part that overlaps the driving magnet 310 in the x-axis direction and a second part that does not overlap the driving magnet 310 in the x-axis direction. The second portion may protrude outwardly from the first portion. The second portion may protrude above and below the first portion. As a modified example, the repulsive force magnet 500 may completely overlap the driving magnet 310 in the x-axis direction. That is, the entire inner surface area of the repulsive force magnet 500 may completely overlap with the driving magnet 310 in the x-axis direction.

The repulsive force magnet 500 may overlap the coil 320 in the y-axis direction perpendicular to both the optical axis direction and the x-axis direction. The coil 320 may include a first part that overlaps the repulsion magnet 500 in the y-axis direction and a second part that does not overlap. The coil 320 may be disposed between two repulsive force magnets 500 in the y-axis direction. The coil 320 may be disposed between the first unit magnet 501 and the second unit magnet 502 in the y-axis direction. The repulsive force magnet 500 may overlap the sensor 330 in the y-axis direction. The sensor 330 may be disposed between two repulsive force magnets 500 in the y-axis direction. The sensor 330 may be disposed between the first unit magnet 501 and the second unit magnet 502 in the y-axis direction.

The repulsive force magnet 500 may include a plurality of magnets. The repulsive force magnet 500 may include two magnets. The repulsive force magnet 500 may include two magnets spaced apart from each other. The repulsive force magnet 500 may include a first unit magnet 501. The repulsive force magnet 500 may include a second unit magnet 502. The first unit magnet 501 may be placed on one side of the coil 320. The second unit magnet 502 may be disposed on the other side of the coil 320.

The repulsive magnet 500 may be a four-pole magnet. The repulsive magnet 500 may include a four-pole magnetized magnet. The repulsive force magnet 500 may include a lower magnet portion 510 including an N pole and an S pole. The repulsive force magnet 500 may include an upper magnet portion 520 including an S pole and an N pole. The repulsive force magnet 500 may include a neutral portion 530 disposed between the lower magnet portion 510 and the upper magnet portion 520. In the optical axis direction, the length of the neutral portion 530 may be longer than the length of the lower magnet portion 510. In the optical axis direction, the length of the neutral portion 530 may be longer than the length of the upper magnet portion 520. In the optical axis direction, the length of the neutral portion 530 may be longer than the sum of the lengths of the lower magnet portion 510 and the upper magnet portion 520. In the optical axis direction, the length of the neutral portion 530 may be equal to the sum of the lengths of the lower magnet portion 510 and the upper magnet portion 520. In the optical axis direction, the length of the neutral portion 530 may be smaller than the sum of the lengths of the lower magnet portion 510 and the upper magnet portion 520.

The upper magnet unit 520 may be disposed on the lower magnet unit 510. The lower magnet portion 510 and the upper magnet portion 520 may be arranged in the optical axis direction. The lower magnet portion 510 and the upper magnet portion 520 may be spaced apart in the optical axis direction. A neutral portion 530 may be disposed between the lower magnet portion 510 and the upper magnet portion 520.

The N pole of the lower magnet portion 510 of the repulsive force magnet 500 may face the N pole of the lower magnet portion 311 of the driving magnet 310. The S pole of the upper magnet portion 520 of the repulsive force magnet 500 may face the S pole of the upper magnet portion 312 of the driving magnet 310. That is, the repulsive force magnet 500 and the driving magnet 310 may be arranged so that the same poles face each other.

In the optical axis direction, the length of the neutral portion 530 of the repulsive force magnet 500 may be longer than the length of the neutral portion 313 of the driving magnet 310 (see (a) of FIG. 21). In the optical axis direction, the length of the repulsive force magnet 500 may be longer than the length of the driving magnet 310. In the optical axis direction, the length of the lower magnet portion 510 of the repulsive force magnet 500 may be shorter than the length of the lower magnet portion 311 of the driving magnet 310. In the optical axis direction, the length of the upper magnet portion 520 of the repulsive force magnet 500 may be shorter than the length of the upper magnet portion 312 of the driving magnet 310.

When the driving magnet 310 moves as far as possible downward in the optical axis direction, the first boundary between the lower magnet part 311 of the driving magnet 310 and the neutral part 313 of the driving magnet 310 is the repulsion magnet 500. ) can be placed at the same height as 3/4 point, that is, 75% point (c in Figure 21(c)) above the neutral part 530 (see Figure 21(c)).

When the driving magnet 310 moves as far as possible downward in the optical axis direction, the first boundary between the lower magnet part 311 of the driving magnet 310 and the neutral part 313 of the driving magnet 310 is the repulsion magnet 500. ) may be disposed at a height equal to or lower than the first boundary between the lower magnet portion 510 and the neutral portion 530 of the repulsive force magnet 500.

When the driving magnet 310 moves as far as possible downward in the optical axis direction, the first boundary between the lower magnet part 510 of the repulsive force magnet 500 and the neutral part 530 of the repulsive force magnet 500 is the driving magnet 310. ) may be arranged at the same height as the first boundary between the lower magnet portion 311 and the neutral portion 313 of the driving magnet 310.

When the driving magnet 310 moves as far as possible downward in the optical axis direction, the first boundary between the lower magnet part 510 of the repulsive force magnet 500 and the neutral part 530 of the repulsive force magnet 500 is the driving magnet 310. ) may be arranged at a height lower than the first boundary between the lower magnet portion 311 and the neutral portion 313 of the driving magnet 310.

When the driving magnet 310 moves as far as possible upward in the optical axis direction, the second boundary between the upper magnet part 312 of the driving magnet 310 and the neutral part 313 of the driving magnet 310 is the repulsion magnet 500. ) can be placed at the same height as 1/4 point, that is, 25% point (b in FIG. 21(b)) above the neutral part 530 (see (b) in FIG. 21).

When the driving magnet 310 moves as far as possible upward in the optical axis direction, the second boundary between the upper magnet part 312 of the driving magnet 310 and the neutral part 313 of the driving magnet 310 is the repulsion magnet 500. ) may be disposed at a height equal to or higher than the second boundary between the upper magnet portion 520 of the repulsion magnet 500 and the neutral portion 530 of the repulsion magnet 500.

When the driving magnet 310 moves as far as possible upward in the optical axis direction, the second boundary between the upper magnet part 520 of the repulsive force magnet 500 and the neutral part 530 of the repulsive force magnet 500 is the driving magnet 310. ) may be placed at the same height as the second boundary between the upper magnet portion 312 of the magnet and the neutral portion 313 of the driving magnet 310.

When the driving magnet 310 moves as far as possible upward in the optical axis direction, the second boundary between the upper magnet part 520 of the repulsive force magnet 500 and the neutral part 530 of the repulsive force magnet 500 is the driving magnet 310. ) may be placed at a height higher than the second boundary between the upper magnet portion 312 of the magnet and the neutral portion 313 of the driving magnet 310.

In this embodiment, even when the driving magnet 310 moves through the above-mentioned structure, a phenomenon in which the different polarities of the driving magnet 310 and the repulsive force magnet 500 are arranged to face each other can be prevented.

Hereinafter, auto focus (AF) operation of the lens driving device according to this embodiment will be described with reference to the drawings.

23 to 25 are diagrams for explaining autofocus driving of the lens driving device according to this embodiment. Figure 23 is a cross-sectional view showing the moving part in the initial state in which no current is applied to the coil. Figure 24 is a cross-sectional view showing the moving part moving upward in the optical axis direction when a forward current is applied to the coil. Figure 25 is a cross-sectional view showing the moving part moving downward in the optical axis direction when a reverse current is applied to the coil.

As shown in FIG. 23, the moving unit 200 may be placed in a position spaced apart from both the upper plate 131 and the base 110 of the cover 130 in an initial position where no current is applied to the coil 320. .

When a forward current is applied to the coil 320, the driving magnet 310 can move upward in the optical axis direction due to electromagnetic interaction between the coil 320 and the driving magnet 310 (see A in FIG. 24). At this time, the holder 210 may move upward in the optical axis direction together with the driving magnet 310. Furthermore, the lens can move upward in the optical axis direction together with the holder 210. Accordingly, the distance between the lens and the image sensor can be changed to adjust the focus of the image formed on the image sensor through the lens.

When a reverse current is applied to the coil 320, the driving magnet 310 can move downward in the optical axis direction due to electromagnetic interaction between the coil 320 and the driving magnet 310 (see B in FIG. 25). At this time, the holder 210 along with the driving magnet 310 may move downward in the optical axis direction. Furthermore, the lens can move downward in the optical axis direction together with the holder 210. Accordingly, the distance between the lens and the image sensor can be changed to adjust the focus of the image formed on the image sensor through the lens.

Meanwhile, during the movement of the driving magnet 310, the sensor 330 can detect the strength of the magnetic field of the driving magnet 310 and detect the amount or position of movement of the lens in the optical axis direction. The movement amount or position of the lens in the optical axis direction detected by the sensor 330 can be used for autofocus feedback control.

Hereinafter, the camera device according to this embodiment will be described with reference to the drawings.

Figure 26 is an exploded perspective view of the camera device according to this embodiment.

The camera device 10A may include a camera module.

Camera device 10A may include a lens module 20. The lens module 20 may include at least one lens. The lens may be placed in a position corresponding to the image sensor 60. The lens module 20 may include a lens and a barrel. The lens module 20 may be coupled to the holder 210 of the lens driving device 10. The lens module 20 may be coupled to the holder 210 by screwing and/or adhesive. The lens module 20 can be moved integrally with the holder 210.

Camera device 10A may include a filter 30. The filter 30 may serve to block light in a specific frequency band from light passing through the lens module 20 from entering the image sensor 60 . Filter 30 may be arranged parallel to the x-y plane. The filter 30 may be disposed between the lens module 20 and the image sensor 60. Filter 30 may be placed on sensor base 40. As a variant, the filter 30 may be disposed on the base 110. Filter 30 may include an infrared filter. The infrared filter can block light in the infrared region from being incident on the image sensor 60.

Camera device 10A may include a sensor base 40. The sensor base 40 may be disposed between the lens driving device 10 and the printed circuit board 50. The sensor base 40 may include a protrusion 41 on which the filter 30 is disposed. An opening may be formed in the portion of the sensor base 40 where the filter 30 is disposed to allow light passing through the filter 30 to enter the image sensor 60 . The adhesive member may couple or adhere the base 110 of the lens driving device 10 to the sensor base 40. The adhesive member may additionally serve to prevent foreign substances from entering the interior of the lens driving device 10. The adhesive member may include one or more of epoxy, thermosetting adhesive, and ultraviolet curing adhesive.

In a variant, the sensor base 40 may be omitted. In this case, the filter 30 may be coupled to the base 110 of the lens driving device 10. The filter 30 may be coupled to the lower surface of the base 110 of the lens driving device 10. Additionally, in a variant, the sensor holder 40 may be formed to protect only the image sensor 60. That is, the base 110 of the lens driving device 10 may be placed directly on the printed circuit board 50. At this time, the sensor holder 40 may be placed within the base 110. The base 110 may be formed to surround the sensor holder 40. The base 110 may include a leg portion that is an outer wall mounted on the printed circuit board 50.

The camera device 10A may include a printed circuit board (PCB) 50. The printed circuit board 50 may be a board 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. The printed circuit board 50 may be equipped with various circuits, elements, and control units to convert the image formed on the image sensor 60 into an electrical signal and transmit it to an external device.

The camera device 10A may include an image sensor 60. The image sensor 60 may be configured to form an image by entering light that has passed through the lens and filter 30. The image sensor 60 may be mounted on the 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 so that its optical axis coincides 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 to the effective image area of the image sensor 60 into an electrical signal. The image sensor 60 may be one of a charge coupled device (CCD), a metal oxide semiconductor (MOS), a CPD, and a CID.

Camera device 10A may include a motion sensor 70. The motion sensor 70 may be mounted on the printed circuit board 50. The motion sensor 70 may be electrically connected to the control unit 80 through a circuit pattern provided on the printed circuit board 50. The motion sensor 70 may output rotational angular velocity information resulting from the movement of the camera device 10A. The motion sensor 70 may include a 2-axis or 3-axis gyro sensor, or an angular velocity sensor.

The camera device 10A may include a control unit 80. The control unit 80 may be disposed on the printed circuit board 50. The control unit 80 may be electrically connected to the coil 310 of the lens driving device 10. The control unit 80 can individually control the direction, intensity, and amplitude of the current supplied to the coil 310. The control unit 80 may control the lens driving device 10 to perform an autofocus function and/or an image stabilization function. Furthermore, the control unit 80 may perform autofocus feedback control and/or camera shake correction feedback control for the lens driving device 10.

Camera device 10A may include a connector 90. The connector 90 may be electrically connected to the printed circuit board 50. The connector 90 may include a port for electrical connection to an external device.

Hereinafter, the optical device according to this embodiment will be described with reference to the drawings.

Figure 27 is a perspective view of an optical device according to this embodiment. Figure 28 is a perspective view of an optical device according to a modified example.

Optical devices (1) include cell phones, mobile phones, portable terminals, mobile terminals, smart phones, smart pads, portable smart devices, digital cameras, laptop computers, digital broadcasting terminals, and PDAs (Personal Digital Assistants). , PMP (Portable Multimedia Player), and navigation may be included. The optical device 1 may include any device for taking images or photos.

The optical device 1 may include a body 20. The optical device 1 may include a camera device 10A. The camera device 10A may be placed in the main body 20. The camera device 10A can photograph a subject. The optical device 1 may include a display. The display may be placed on the main body 20. The display may output one or more of a video or an image captured by the camera device 10A. The display may be placed on the first side of the main body 20. The camera device 10A may be disposed on one or more of the first side of the main body 20 and the second side opposite the first side. As shown in FIG. 27, the camera device 10A may have triple cameras arranged vertically. As shown in FIG. 28, the camera device 10A-1 may have triple cameras arranged horizontally.

Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention can be implemented in other specific forms without changing its technical idea or essential features. You will be able to understand it. Therefore, the embodiments described above should be understood in all respects as illustrative and not restrictive.

Claims (16)

fixing part;
A moving part disposed within the fixed part;
A coil disposed on the fixing part;
a first magnet disposed on the moving unit and interacting with the coil;
a second magnet disposed on the fixing part; and
Includes a ball disposed between the fixed part and the moving part,
The second magnet is a lens driving device that presses the first magnet so that the ball is pressed between the fixed part and the moving part. According to paragraph 1,
When current is applied to the coil, the first magnet moves in the optical axis direction. According to paragraph 1,
The coil overlaps the first magnet in a first axis direction perpendicular to the optical axis,
The second magnet is a lens driving device that overlaps the first magnet in the first axis direction. According to paragraph 3,
The second magnet is a lens driving device including a first part that overlaps the first magnet in the first axis direction and a second part that does not overlap the first magnet in the first axis direction. According to paragraph 3,
The second magnet is a lens driving device that overlaps the coil in a second axis direction perpendicular to the optical axis direction and the first axis direction. According to paragraph 1,
The second magnet is a lens driving device including a first unit magnet disposed on one side of the coil and a second unit magnet disposed on the other side of the coil. According to paragraph 1,
A lens driving device wherein the second magnet is arranged to generate a repulsive force with the first magnet. According to paragraph 1,
The first magnet includes a first magnet part including an N pole and an S pole, a second magnet part including an S pole and an N pole, and a neutral part disposed between the first magnet part and the second magnet part. A lens driving device comprising: According to clause 8,
The second magnet includes a first magnet portion including an N pole and an S pole, a second magnet portion including an S pole and an N pole, the first magnet portion of the second magnet, and the magnet portion of the second magnet. It includes a neutral part disposed between the second magnet parts,
The N pole of the first magnet portion of the second magnet faces the N pole of the first magnet portion of the first magnet,
The lens driving device wherein the S pole of the second magnet portion of the second magnet faces the S pole of the second magnet portion of the first magnet. According to clause 9,
In the optical axis direction, the length of the neutral part of the second magnet is longer than the length of the neutral part of the first magnet. According to clause 9,
When the first magnet moves as far as possible downward in the optical axis direction, the first boundary between the first magnet portion of the first magnet and the neutral portion of the first magnet is the first boundary between the first magnet portion of the second magnet. A lens driving device disposed at a height equal to or lower than the first boundary between the neutral portion of the second magnet and the neutral portion of the second magnet. According to clause 9,
When the first magnet moves as far as possible upward in the optical axis direction, the second boundary between the second magnet portion of the first magnet and the neutral portion of the first magnet is the second boundary between the second magnet portion of the second magnet. A lens driving device disposed at a height equal to or higher than the second boundary between the neutral portion of the second magnet and the neutral portion of the second magnet. According to clause 9,
In the optical axis direction, the length of the second magnet is longer than the length of the first magnet,
In the optical axis direction, the length of the first magnet portion of the second magnet is shorter than the length of the first magnet portion of the first magnet. fixing part;
A moving part disposed within the fixed part;
A coil disposed on the fixing part;
a magnet disposed on the moving unit and interacting with the coil; and
Includes a ball disposed between the fixed part and the moving part,
The fixing unit includes a first side wall on which the coil is disposed, a second side wall disposed on an opposite side of the first side wall, and the first side wall and the second side wall in a first direction toward the second side wall. It includes protrusions disposed to overlap between the side walls,
In the first direction, the moving part includes a protrusion disposed between the first side wall of the fixing part and the protrusion,
A lens driving device wherein the ball is disposed between the protrusion of the moving part and the protrusion of the fixed part. printed circuit board;
an image sensor disposed on the printed circuit board;
The lens driving device of any one of claims 1 to 14 disposed on the printed circuit board; and
A camera device including a lens coupled to the lens driving device. main body;
The camera device of claim 15 disposed in the main body; and
An optical device including a display disposed on the main body and outputting at least one of a video captured by the camera device and an image.

Images