WO2015141943A1 - Camera actuator for portable terminal - Google Patents

Abstract

The present invention relates to a camera actuator for a portable terminal and, more specifically, to a camera actuator for a portable terminal having a camera-shake correction function of correcting the shaking of a camera by moving a lens in a direction perpendicular to the optical axis of the lens. The camera actuator for a portable terminal, according to the present invention, comprises: a fixing part mounted to the portable terminal; a first moving part disposed in the interior of the fixing part to move in a perpendicular direction to an optical axis; a plurality of magnets mounted to the first moving part; and a plurality of first coils mounted to the fixing part to correspond to the magnets, respectively, and wound around a correction space into which the magnets are to be inserted, wherein one of the magnets is inserted into the correction space of the first coils facing the magnets when a current flows in the first coils.

Description

Camera Actuator for Mobile Devices

The present invention relates to a camera actuator for a portable terminal, comprising a camera shake correction function for correcting camera shake by moving the lens in the vertical direction of the lens optical axis.

Portable terminals such as smartphones are widely used and used, and various functions can be implemented, and are usefully used in real life as well as voice communication.

Among them, the camera function is essentially installed in the mobile terminal, and high quality shooting is possible that is inferior to a general camera.

In addition, according to the improvement of the performance of the camera mounted on the portable terminal, it is possible to conveniently photograph using the portable terminal.

In order to implement such a camera function, the portable terminal is equipped with a voice coil motor that can adjust the gap between the lens and the image sensor or correct camera shake.

Korean Patent Laid-Open Publication No. 10-2012-0078915 discloses a combined function voice coil motor which is a camera actuator mounted on a portable terminal.

1 is a longitudinal sectional view of a conventional camera actuator.

Conventional camera actuators include a lens accommodation unit (100) for storing and lifting a lens; A fixed unit 200 wrapped around the outer surface of the lens accommodation unit 100 and fixed; And facing the outer surface of the lens housing unit 100 and the inner surface of the fixing unit 200, respectively, to raise the lens storage unit 100 or to respond to shaking of the lens storage unit 100. It includes a driving unit 300 for tilting the lens housing unit 100 to correct the shake.

The driving unit 300 includes a plurality of magnets 310 disposed on the outer surface of the lens accommodating unit 100 and an inner surface of the fixing unit 200 so as to face the magnets 310. It includes a coil block 320 disposed in.

In the conventional camera actuator, when a shake occurs due to hand shake, the lens accommodating unit equipped with the magnet corrects the shake while moving back and forth in the coil block direction.

However, the conventional camera actuator needs an operating space in which the lens housing unit can be driven between the fixing unit and the lens housing unit in order to correct the shake, that is, the camera shake.

Due to the operating space, the thickness of the actuator including the fixed unit and the receiving unit becomes thick, and accordingly, the overall size of the actuator increases, which makes it difficult to miniaturize the actuator.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and an object thereof is to provide a camera actuator for a portable terminal that can easily secure an internal space except for an operation space for image stabilization while maintaining a small overall size.

In order to achieve the above object, a camera actuator for a portable terminal of the present invention includes a camera actuator including a hand shake correction function for correcting camera shake by moving a lens in a vertical direction of a lens optical axis, the fixing unit being mounted to a portable terminal; A first moving part disposed in the fixing part and moving in a vertical direction of the optical axis; A plurality of magnets mounted to the first moving part; And a plurality of first coils mounted on the fixing part so as to correspond to each of the magnets, and wound around a correction space into which the magnets can be inserted. When the current flows in the first coils, the magnets One of the magnets is inserted into the correction space of the first coil facing the magnet.

The magnet is composed of a single pole and polarized in the vertical direction of the optical axis.

The magnet may include a first magnet that is polarized in a vertical direction of the optical axis, and a second magnet that is formed on upper and lower portions of the first magnet and is polarized in a direction opposite to the first magnet. .

In addition, the camera actuator for a mobile terminal of the present invention further comprises a focus adjusting unit for adjusting the focus of the camera by moving the lens in the optical axis direction, the focus adjusting unit, the lens is mounted and the first moving unit And a second coil coupled to the second moving part moving in the optical axis direction and mounted on an outer circumferential surface of the second moving part and positioned in a magnetic field formed by the magnet.

And the second coil is composed of an upper coil and a lower coil spaced apart up and down.

The camera actuator for a portable terminal according to the present invention has the following effects.

When the camera shake correction is performed, the magnet mounted on the first moving portion moving in the vertical direction of the lens optical axis is inserted into the correction space formed at the coil winding center, whereby the first moving portion and the second movement for camera shake correction are performed. By minimizing the working space between the parts to keep the overall size small and easy to secure the internal space excluding the working space, it is easy to install and assemble the parts and increase the size of the installable parts.

As the size of components that can be installed inside the limited size camera actuator is increased, it is easy to implement a high performance compact camera.

In addition, by using a magnet of a single pole, it is possible to reduce the manufacturing cost of the actuator while generating sufficient driving force for camera shake correction and focus adjustment.

1 is a longitudinal sectional view of a conventional camera actuator.

2 is a perspective view of a camera actuator for a portable terminal according to a first embodiment of the present invention.

3 is an exploded perspective view of a camera actuator for a portable terminal according to the first embodiment of the present invention.

4 is a longitudinal cross-sectional view taken along line A-A of FIG.

Figure 5 is an exploded perspective view showing a separate portion B of Figure 3;

6 is a longitudinal sectional view of a camera actuator for a portable terminal according to a second embodiment of the present invention.

The present invention relates to a camera actuator including a camera shake correction function for correcting camera shake by moving the lens in a vertical direction of the lens optical axis.

2 is a perspective view of a camera actuator for a portable terminal according to a first embodiment of the present invention, Figure 3 is an exploded perspective view of a camera actuator for a portable terminal according to a first embodiment of the present invention, Figure 4 (a) is a view 4 is a longitudinal cross-sectional view taken along line AA, and FIG. 4 (b) is a view showing a state in which the first moving part is moved in FIG. 4 (a), and FIG. 5 is an exploded perspective view showing a part B of FIG. As a figure, it shows the components mounted on the first moving part and the second moving part except the fixed part and the first moving part and the second moving part.

Hereinafter, a camera actuator for a portable terminal of the present invention will be described in detail with reference to the accompanying drawings.

First embodiment

As shown in FIGS. 2 to 5, the camera actuator for the portable terminal according to the first embodiment of the present invention includes the fixing unit 10, the first moving unit 20, the magnet 30, and the first coil 40. ), The second moving unit 50 and the second coil (60).

The fixing part 10 is mounted on the portable terminal, and forms the outer shape of the actuator as shown in FIG.

Specifically, as shown in FIG. 3, the fixing unit 10 includes a base 11 mounted to the mobile terminal, and the first moving unit 20 and the second moving unit 50 mounted to the base 11. Cover 12 and a spacer 13 mounted on an inner upper surface of the cover 12.

A space in which the first moving part 20 and the second moving part 50 are disposed is formed between the base 11 and the spacer 13.

The first moving part 20 is disposed inside the fixing part 10 to move in the vertical direction (x-axis direction or y-axis direction) of the lens optical axis.

The first moving part 20 is spaced apart from an upper portion of the base 11 by the first suspension member 21 and disposed between the base 11 and the spacer 13.

The first suspension member 21 is formed in a coil spring shape so that an upper end is mounted on the spacer 13 and a lower end is mounted on the first moving part 20.

Since the first suspension member 21 is formed in a coil spring shape, the shape of the first suspension member 21 is easily changed and restored, and thus the first moving part 20 is easily moved, and the impact resistance is excellent.

In some embodiments, the first suspension member 21 may be a straight wire.

The magnet 30 is mounted to the first moving part 20 as shown in FIGS. 4 and 5.

Specifically, the magnet 30 is composed of a single pole as shown in Figure 4 is polarized in the vertical direction of the optical axis.

That is, the magnet 30 is polarized such that the outer side adjacent to the first coil 40 and the inner side adjacent to the second coil 60 have different polarities.

As shown in FIG. 5, four magnets 30 are mounted on the side surfaces of the first moving part 20 in the front, rear, left, and right directions.

Each of the magnets 30 protrudes from the outer side of the first moving part 20.

In other words, the thickness of the first moving part 20 is formed to be thinner than the thickness of the magnet 30.

Thus, the present invention can reduce the manufacturing cost of the actuator while generating a sufficient driving force for camera shake correction and focus adjustment by using the magnet 30 of the single pole.

The first coil 40 is mounted to the fixing part 10 so as to correspond to each magnet 30, and is wound around the correction space 41 into which the magnet 30 can be inserted as shown in FIG. 3. It is.

Specifically, as shown in FIG. 4, the circuit board 42 is mounted on the inner surface of the cover 12, and the four first coils 40 are mounted on the inner surface of the cover 12. 42 and a magnet 30 corresponding to each of the magnets 30, and a magnet 30 corresponding to any one of the four first coils 40, the center of the first coil 40. It may be inserted into the correction space 41 formed in the.

That is, in the pair of first coil 40 and the magnet 30 corresponding to each other, the magnet 30 may be inserted into the correction space 41 formed in the center of the first coil 40. .

In addition, when a current flows in the first coil 40 for camera shake correction, an electromagnetic force is generated, and the electromagnetic force is a driving force for moving the first moving part 20 in the vertical direction of the optical axis. As shown in the drawing, the first coil 40 facing one of the magnets 30 of the magnets 30 of the plurality of magnets 30 in the direction in which the first moving part 20 moves by the driving force. Is inserted into the correction space 41.

Meanwhile, a hall sensor 43 is mounted on the circuit board 42 to detect a change in the position of the magnet 30.

The hall sensor 43 is disposed above the magnet 30 to provide feedback information on the position of the first moving part 20 that moves to correct camera shake.

The second mover 50 has a lens (not shown) mounted therein, and is coupled to the first mover 20 to move in the optical axis direction (z-axis direction) of the lens.

As shown in FIG. 5, the second moving part 50 is supported by the second suspension member 51 to be movable in the optical axis direction of the lens.

That is, the second suspension member 51 is a leaf spring, one end of which is mounted to the first moving part 20 and the other end of which is mounted to the second moving part 50 to support the second moving part 50.

The second suspension member 51 may be formed in various shapes according to the embodiment.

The second coil 60 is mounted on the outer circumferential surface of the second moving part 50 and positioned in a magnetic field formed by the magnet 30.

Accordingly, when a current flows in the second coil 60, an electromagnetic force is generated, and the electromagnetic force is a driving force for moving the second moving part 50 in the optical axis direction.

Hereinafter, a method of operating a camera actuator for a portable terminal according to a first embodiment of the present invention will be described.

In the initial state in which no current flows in the first coil 40, the first moving part 20 is located very close to the first coil 40 so that the magnet 30 is not inserted into the correction space 41.

If the camera shakes due to camera shake, a current flows through the first coil 40, and a magnet 30 forming a magnetic field around the first coil 40 and the first coil 40 through which the current flows. As a result, a driving force for correcting hand shake is generated.

The first moving part 20 moves in the vertical direction of the lens optical axis by the driving force, and when the first moving part 20 moves in one of the vertical direction of the lens optical axis, that is, the front, rear, left, and right directions, the first moving part 20 moves in the corresponding direction. The magnet 30 positioned is inserted into the correction space 41 formed in the center of the first coil 40.

The front, rear, left, and right directions described above are based on the drawings for convenience of description and may vary depending on the use state of the portable terminal equipped with the camera actuator or the direction in which the camera actuator is viewed.

As described above, when the camera shake correction is performed, the magnet 30 mounted on the first moving part 20 moving in the vertical direction of the lens optical axis is inserted into the correction space 41 formed at the winding center of the coil. By minimizing the operating space between the first moving unit 20 and the second moving unit 50 for image stabilization, it is easy to secure the internal space excluding the operating space while keeping the overall size of the actuator small. It is easy to assemble and can increase the size of installable parts.

In addition, when a current flows in the second coil 60, a driving force for adjusting the focus is generated by the magnet 30 and the second coil 60, which form a magnetic field around the second coil 60. The second moving part 50 moves in the optical axis direction of the lens by the driving force.

Second embodiment

The camera actuator for the portable terminal according to the second embodiment is different from the magnet in comparison with the first embodiment, and thus the magnet will be described.

6 (a) is a longitudinal cross-sectional view of a camera actuator for a mobile terminal according to a second embodiment of the present invention, Figure 6 (b) is a second coil different from the second coil of Figure 6 (a) is mounted Is a longitudinal sectional view of a camera actuator for a portable terminal.

The camera actuator for a mobile terminal according to the second embodiment of the present invention includes a fixed part 10, a first moving part 20, a magnet 30, a first coil 40, a second moving part 50, and It consists of a second coil (60).

The fixing part 10, the first moving part 20, and the first coil 40 are the same as in the first embodiment, and thus detailed description thereof will be omitted.

The magnet 30 is mounted to the first moving part 20 and includes a first magnet 30a and a second magnet 30b.

As illustrated in FIG. 6A, the first magnet 30a is polarized in the vertical direction of the lens optical axis.

That is, the first magnet 30a is polarized such that the outer side adjacent to the first coil 40 and the inner side adjacent to the second coil 60 have different polarities.

The second magnet 30b is formed above and below the first magnet 30a, and is polarized in the opposite direction to the first magnet 30a.

Meanwhile, the second coil 60 is mounted on the outer circumferential surface of the second moving part 50 in the same manner as in the first embodiment.

In addition, the second coil 60 may be composed of an upper coil 60a and a lower coil 60b spaced apart from each other, as shown in FIG. 6 (b).

The structure of the magnet 30 and the coil according to the second embodiment is to increase the driving force for correcting the camera shake or adjusting the focus, and the manufacturing cost is increased compared to the first embodiment, but the driving force can be increased. There is an advantage to that.

It is the same as that of 1st Embodiment except the above-mentioned matter.

The camera actuator for a portable terminal of the present invention is not limited to the above-described embodiment, and can be modified in various ways within the range to which the technical idea of the present invention is permitted.

Claims (5)

In the camera actuator comprising a camera shake correction function for correcting camera shake by moving the lens in the vertical direction of the lens optical axis, A fixed part mounted to the portable terminal; A first moving part disposed in the fixing part and moving in a vertical direction of the optical axis; A plurality of magnets mounted to the first moving part; A plurality of first coils mounted on the fixing part to correspond to the magnets and wound around a correction space into which the magnets can be inserted, When a current flows in the first coil, any one of the magnet is inserted into the correction space of the first coil facing the magnet, the camera actuator for a mobile terminal. The method according to claim 1, The magnet is a camera actuator for a mobile terminal, characterized in that the polarized in the vertical direction of the optical axis consisting of a single pole. The method according to claim 1, The magnet, A first magnet polarized in the vertical direction of the optical axis, And a second magnet formed on an upper portion and a lower portion of the first magnet and polarized in a direction opposite to the first magnet, respectively. The method according to any one of claims 1 to 3, It further comprises a focus adjusting unit for adjusting the focus of the camera by moving the lens in the optical axis direction, The focus adjusting unit, A second mover mounted to the lens and coupled to the first mover to move in the optical axis direction; And a second coil mounted on an outer circumferential surface of the second moving part and positioned in a magnetic field formed by the magnet. The method according to claim 4, The second coil is a camera actuator for a portable terminal, characterized in that consisting of the upper coil and the lower coil spaced apart up and down.

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