KR20210028635A - Actuator mounted with structure of multi magnetic pole magnet - Google Patents

Abstract

According to the present invention, an actuator with a multipolar magnet structure comprises: a carrier, where a lens is mounted, linearly moved in a direction of the optical shaft; a housing storing the carrier; a coil unit composed of n coils, wherein the n is natural number of at least two, vertically arranged based on the direction of the optical shaft and provided to the housing; and a magnet mounted in the carrier, facing the coil unit, and having stimulation in a direction of facing the coil unit composed of n+1 stimuli.

Description

Actuator equipped with multi-pole magnet structure {ACTUATOR MOUNTED WITH STRUCTURE OF MULTI MAGNETIC POLE MAGNET}

The present invention relates to an actuator for driving a lens, and more particularly, to an actuator in which a multi-pole magnet structure is mounted on a carrier equipped with a lens.

In accordance with the development of hardware technology and changes in user environments, various and complex functions in addition to basic functions for communication are integrated in portable terminals (mobile terminals).

A typical example is a camera module that implements functions such as auto focus (AF) and optical image stabilization (OIS). Recently, voice recognition, fingerprint recognition, iris recognition for authentication or security, etc. Functions and the like are also being installed in portable terminals.

Also, in recent years, attempts have been made to mount a zoom lens capable of varying the size of a subject by variously adjusting the focal length through zoom-in and zoom-out functions.

The light of the subject passing through the zoom lens flows into an image pickup device such as a charged-coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS) like other lenses, and is then generated as image data through subsequent processing.

In the case of a zoom lens, since it has a structure in which a plurality of lenses or lens groups are arranged coaxially in the direction of the optical axis, which is the direction in which light is introduced, the length thereof is extended in the optical axis direction than a general lens. For adjustment, it has a characteristic that the moving displacement moving relative to the direction of the optical axis is relatively large.

In the case of a zoom lens, since the weight and volume of the lens itself is large and the moving displacement (also referred to as stroke) is large, as shown in Fig. A plurality of magnets (20) are mounted, and a plurality of magnets (20-1, 20-2) and a plurality of coils (10) facing each other are mounted in a fixed body housing corresponding to the carrier (30), and therebetween. The carrier 30 may be configured to move by the generated magnetic force, and in this case, it can be said that the driving force is dispersed in the vertical direction and the driving force is increased.

On the other hand, as seen in the positional relationship between the coil 10 and the magnet 20 as shown in FIG. 1(a), the magnet 20 in the area S parallel to the optical axis direction Z among the areas of the coil 10 Since a magnetic force orthogonal to the magnetic force of) is generated, a driving force for moving the carrier 30 is not generated, and a driving force is generated in a region P perpendicular to the optical axis direction Z.

In the case of an embodiment in which a plurality of magnets 20 are provided as in the prior art, as shown in FIG. 1(b), when the moving displacement of the carrier 30 is not large, the P region of the coil 10 is the magnet 20 Because it faces the corresponding stimulus of, the driving force can act. However, when the moving displacement of the carrier 30 increases as shown in Fig. 1(c), the P area of the coil 10 is out of the corresponding magnetic pole range of the magnet 20, so it is not suitable for zoom driving with a large movement displacement (stroke). There is a problem that it is not possible.

In order to solve this problem, it is inevitable to sufficiently separate the gap D1 between the coils 10 and the gap D2 between the magnets, and mount a magnet 20 having a considerably large size on the carrier 30.

Therefore, in the case of such a conventional technique, the space between the magnet 20 and the coil 10 must be increased that much, so the volume of the actuator itself increases, and the driving efficiency decreases as the weight of the carrier increases. The efficiency of the assembly process can also be said to be low because the magnets must be arranged at an appropriate distance.

The present invention was invented to solve the above-described problems in the background as described above, and by improving the magnetic pole structure of the magnet, the coil and the magnet can be kept facing each other even if the moving distance of the carrier increases, thereby driving efficiency of the carrier. Its purpose is to implement an actuator that can further improve

Other objects and advantages of the present invention can be understood by the following description, and will be more clearly understood by the embodiments of the present invention. In addition, the objects and advantages of the present invention can be realized by the configuration shown in the claims and a combination of the configuration.

An actuator equipped with a multi-pole magnet structure of the present invention for achieving the above object includes: a carrier mounted with a lens and linearly moving in an optical axis direction; A housing accommodating the carrier; A coil unit including n (n is a natural number of 2 or more) coils provided in the housing and disposed vertically with respect to the optical axis direction; And a magnet mounted on the carrier and facing the coil unit, wherein magnetic poles in a direction facing the coil unit are formed of n+1 magnetic poles.

Preferably, the n number of coils of the present invention may be composed of two upper and lower coils, and in this case, the magnet of the present invention may be formed of three poles.

In addition, the magnet of the present invention is located in the middle of the common magnetic pole consisting of one of the N-pole or S-pole; And upper and lower magnetic poles that have magnetic poles opposite to the common magnetic pole and are positioned above and below the common magnetic pole with respect to the optical axis direction.

Further, the common magnetic pole of the magnet of the present invention faces with the lower part of the upper coil and the upper part of the lower coil, the upper magnetic pole of the magnet faces the upper part of the upper coil, and the lower magnetic pole of the magnet faces the upper part of the upper coil. It is preferably configured to face the lower part of the lower coil.

In addition, a length of the common stimulus based on the optical axis direction of the present invention may be longer than a length of the upper stimulus and the lower stimulus based on the optical axis direction.

Preferably, the upper coil and the lower coil of the present invention may be configured such that the directions of the applied power are opposite to each other, and the magnet of the present invention may be made of 6-pole magnetization.

Furthermore, the present invention may further include an optical system module that reflects light of a subject incident from the outside in the direction of the optical axis.

In addition, the n coils of the present invention are formed in a track shape including an upper part and a lower part in a direction perpendicular to the optical axis direction, in this case, based on the optical axis direction among two adjacent coils from the n coils. The lower part of the upper coil positioned above and the upper part of the lower coil positioned lower than the upper coil may be configured to face the same magnetic pole among n+1 poles of the magnet.

According to a preferred embodiment of the present invention, it is possible to improve the driving force between the magnet and the coil, and at the same time, it is possible to implement a single number of magnets mounted on the carrier, thereby improving process efficiency.

In addition, according to the present invention, by improving the magnetic pole of the magnet facing the plurality of coils into a three-pole structure and configuring the length of the central common electrode in the optical axis direction to be relatively longer than that of other electrodes, movement of the carrier is reduced, such as zoom driving. It can also be optimized for larger drives.

In addition, since the corresponding structure of the coil and the magnet can be implemented more simply, the design of the actuator and the utilization of the space arrangement can be further improved, as well as the size of the magnet as it does not require an extended space between multiple magnets as in the prior art. The downsizing of the actuator can be made as a whole, making the actuator itself more compact.

The following drawings attached to the present specification illustrate preferred embodiments of the present invention, and serve to more effectively understand the technical spirit of the present invention together with the detailed description of the present invention to be described later, so the present invention is described in these drawings. It is limited to matters and should not be interpreted.
1 is an explanatory diagram for zoom driving by a plurality of magnets in the related art;
2 is a view showing the overall configuration of an actuator according to an embodiment of the present invention,
3 is an exploded view showing a detailed configuration of an actuator according to an embodiment of the present invention,
Figure 4 is a view showing the arrangement of the coil and the magnet of the present invention shown in Figure 3;
5 is a diagram showing a relationship between a coil and a magnet according to an embodiment of the present invention;
6 is a diagram showing the configuration of a magnet according to a preferred embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the specification and claims should not be construed as being limited to their usual or dictionary meanings, and the inventors appropriately explain the concept of terms in order to explain their own invention in the best way. Based on the principle that it can be defined, it should be interpreted as a meaning and concept consistent with the technical idea of the present invention.

Therefore, the embodiments described in the present specification and the configurations shown in the drawings are only the most preferred embodiment of the present invention, and do not represent all the technical spirit of the present invention, and various equivalents that can replace them at the time of application It should be understood that there may be water and variations.

2 is a diagram showing the overall configuration of an actuator 100 (hereinafter referred to as “actuator”) equipped with a multi-pole magnet structure according to an exemplary embodiment of the present invention.

The actuator 100 of the present invention may be implemented as a single device by itself, and may also be implemented as an integrated actuator 1000 that is combined with the optical system module 200 as shown in FIG. 2.

The actuator 100 of the present invention may implement auto focus or zoom by linearly moving the carrier 110 on which the lens 50 is mounted (refer to FIG. 3, etc.) in the optical axis direction.

Since the present invention is mainly applied to a case where the stroke is large, such as zoom driving, the zoom driving will be described as a basic example in the following description, but it is a matter of course that it can be applied to other examples including AF according to the embodiment.

The optical system module 200 performs a function of reflecting or refracting the light path Z1 of the subject to the path Z in the lens direction. As such, the light reflected or refracted in the optical axis direction Z is introduced into an image pickup device (not shown) such as CMOS or CCD through the lens 50 provided in the carrier.

The optical system module 200 for changing the path of light includes an optical system 210 that may be formed of one selected from a mirror or a prism, or a combination thereof. The optical system 210 may be implemented by various members capable of changing light introduced from the outside in the direction of an optical axis, but it is preferable to be implemented with a glass material in order to improve optical performance.

Since the integrated actuator 1000 of the present invention including the optical system module 200 is configured to refract the path of light so that light flows in the direction of the lens 50, the lens itself is not installed in the thickness direction of the mobile terminal and is in the longitudinal direction. Since it can be installed as a portable terminal, it does not increase the thickness of the portable terminal, so it can be optimized for miniaturization or slimming of the portable terminal.

Depending on the embodiment, the optical system 210 may be configured to be rotated and moved by a driving means for generating magnetic force such as a magnet and a coil. In this way, when the optical system 210 moves or rotates in a clockwise or counterclockwise direction based on the YZ plane, the light of the subject reflected (refracted) through the optical system 210 moves in the +Y direction or the -Y direction. Since it is incident on the image pickup device or the lens, correction in the Y-axis direction for hand shake can be implemented through the driving of this mechanism.

3 is an exploded view showing a detailed configuration of the actuator 100 according to an embodiment of the present invention. As shown in FIG. 3, the actuator 100 of the present invention includes a case 101, a lens 50, a carrier 110, and a housing 120.

The carrier 110 of the present invention is configured to linearly move in the optical axis (Z) direction. Since the lens 50 is mounted on the carrier 110, the lens 50 mounted by the linear movement of the carrier 110 is also It moves together and linearly moves in the direction of the optical axis.

The housing 120 provides a space for accommodating the carrier 110, and if the carrier 110 is a moving object, the housing 120 corresponds to a fixed body from a corresponding side thereof. As is well known, a magnet 130 is provided in the carrier 110, which is a moving object, and a coil unit 140 is provided to face the magnet 130 in the housing 120 corresponding to the fixed body or a fixed body equivalent thereto. do.

The carrier 110 of the present invention is an object that moves by the magnetic force between the magnet 130 and the coil unit 140, and the magnetic force between the magnet 130 and the coil unit 140 forms a mutual relationship. As a matter of course, the coil unit 140 may be provided on the carrier 110, which is a moving object, and the magnet 130 may be provided on the housing 120, which is a fixed body.

However, in order to increase the efficiency of structural design and wiring lines, the magnet 130 is provided on the carrier 110, which is a moving object, and the coil unit 140 is mounted on the circuit board 150, and the housing 120 is a fixed body. It is desirable to configure it to be provided in.

A plurality of balls 170 may be provided between the carrier 110 and the housing 120 of the present invention. As such, the plurality of balls 170 are disposed between the carrier 110 and the housing 120, thereby Since the 110 moves relative to the housing 120 with a minimum frictional force due to movement, rolling, and point-contact of the ball, noise is reduced, as well as the driving force is minimized and driven. Precision can be improved.

In order to maintain the distance between the housing 120 and the carrier 110 by an appropriate distance and to guide the linear movement of the carrier 110 more effectively, the ball 170 may be formed of the carrier 110 or It is preferable that a certain portion is accommodated in the guide rails 111 and 121 formed on one or more of the housings 120.

In the drawings, the guide rails 111 and 121 are shown in a form in which the grooves are extended in the Z-axis direction (optical axis direction), but this is only an example, and prevents the ball 170 from being separated or prevents the movement of the ball 170. It goes without saying that it can be implemented in various shapes for guiding.

In addition, some of the first guide rail 111, which is a guide rail provided in the carrier 110, and a part of the second guide rail 121, which is a guide rail provided in the housing 120 in order to increase the efficiency of driving force and linear movement. The cross section is composed of a V-shaped rail, and other guide rails may be composed of a U-shaped rail.

The yoke 160 of the present invention is a configuration arranged to face the magnet 130 with the ball 170 therebetween, and generates an attractive force on the magnet 130 provided in the carrier 110 so that the magnet 130 is The provided carrier 110 is prevented from being separated from the housing 120, and point contact between the carrier 110 and the ball 170, as well as point contact between the housing 120 and the ball 170, etc., can be effectively maintained. To be able to.

The position of the carrier 110, specifically, the position of the magnet 130 or the sensing magnet (not shown) provided in the carrier 110, so that the movement in the optical axis direction of the carrier 110 can be implemented more precisely is a hall effect (hall effect). A Hall sensor or a driving driver 102 in which a Hall sensor is built-in for sensing by using) may be further provided.

The driving driver 102 uses the signal output from the Hall sensor and the characteristics (size and direction) of the power applied to the coil unit 140 together as a feedback control to more precisely transmit the signal to the carrier 110, that is, the carrier 110. The position of the mounted lens 50 can be controlled.

The coil unit 140 according to the present invention includes coils 140-1 and 140-2 of n (n is a natural number greater than or equal to 2) arranged vertically with respect to the optical axis direction as shown in FIG. 3.

In a corresponding viewpoint, the magnet 130 according to the present invention is configured such that the magnetic poles in the direction facing the coil unit 140 are made of n+1 magnetic poles, as described in the drawings below.

Hereinafter, a relationship between the n coil unit 140 and the magnet 130 including n+1 magnetic poles will be described in detail with reference to FIG. 4 and the like.

4 is a view showing the arrangement of the coil unit 140 and the magnet 130 of the present invention shown in Fig. 3, Fig. 5 is a coil unit 140 and a magnet 130 according to a preferred embodiment of the present invention. ) Is a diagram showing the relationship between.

FIG. 4 shows an embodiment in which the coil unit 140 is made of 2 (n=2) coils, and the magnetic poles of the magnet 130 facing the coil unit 140 are made of 3 (2+1). .

Since the coils 140-1 and 140-2 constituting the coil unit 140 are formed in a winding form, their shape forms a so-called track shape. As described above, in relation to the magnet 130, the direction of the optical axis and the Driving force is generated in a region having a vertical direction.

In the following description, the upper (based on the optical axis direction) of the two regions of the track shape of the coils 140-1 and 140-2 forming a direction perpendicular to the optical axis direction is referred to as an upper part (U, see FIG. 5), and the lower The area is referred to as a lower part (B, see Fig. 5).

In addition, among the coil units 140, the upper coil 140-1 is referred to as the upper coil 140-1, and the lower coil 140-2 is referred to as the lower coil 140-2.

The magnet 130 of the present invention is disposed to face the coil unit 140, specifically the upper coil 140-1 and the lower coil 140-2, and as shown in FIG. 4, the coil unit 140 and the It is configured to have three magnetic poles on the facing side.

Specifically, the magnet 130 of the present invention has a common magnetic pole 130-1, which is located in the middle and made of one of the N-pole or the S-pole, and the upper part located above the common magnetic pole 130-1 with respect to the optical axis direction. It consists of a magnetic pole 130-2 and a lower magnetic pole 130-3 positioned below the common magnetic pole 130-1.

The upper stimulation 130-2 and the lower stimulation 130-3 of the present invention have the same stimulation and have a stimulation opposite to that of the common stimulation 130-1.

5, the lower part (B) of the upper coil (140-1) and the upper part (U) of the lower coil (140-2) face the common magnetic pole (130-1) of the magnet (130) together. The upper part (U) of the upper coil (140-1) faces the upper magnetic pole (130-2), and the lower part (B) of the lower coil (140-2) is the lower magnetic pole (130-3) It is arranged to face.

That is, the lower part of the upper coil and the upper part of the lower coil located lower than the upper coil among the two adjacent coils of n coils are the same among the n+1 magnetic poles of the magnet. It is arranged to face the stimulus simultaneously.

When the number of coils and the number of magnetic poles of the magnet are increased, according to the above description, the magnetic poles of the coil and the magnet are arranged vertically with respect to the optical axis direction.

For example, when the number of coils is 3 (n=3), the number of magnetic poles of the magnet 130 is 4, and the upper part of the uppermost coil (the first coil based on the optical axis) is the uppermost magnetic pole of the magnet 130 ( For example, N pole) and the lower part of the uppermost coil is arranged to face the second common magnetic pole (for example, S pole) of the magnet 130 together with the upper part of the middle coil (second coil). do.

According to this arrangement order, the lower part of the middle coil (second coil) faces the third common magnetic pole (eg, N pole) of the magnet 130 together with the upper part of the lowest coil (third coil), Finally, the lower part of the lowermost coil (third coil) is disposed to face the fourth magnetic pole (eg, S pole) of the magnet 130.

Of the two adjacent coils in n coils, the upper coil 140-1 positioned at the upper position with respect to the direction of the optical axis and the lower coil 140-2 positioned at the lower side of the upper coil have the directions of power applied to each other. If the opposite direction, that is, the direction of the power applied to one coil is clockwise, the direction of the power applied to the other coil is configured to be counterclockwise.

As described above, when configuring the coil 140 and the magnet 130, the magnet 130 can be implemented as a single object, thus further simplifying the assembly and manufacturing process of the actuator, as well as shown in FIG. As described above, even if the movement of the carrier 110 increases, the magnetic poles of each magnet 130 and the facing area of the corresponding coil unit 140 can be continuously maintained, thereby effectively overcoming a conventional problem in which the driving force is broken.

In addition, when the magnet 130 is configured as shown in FIG. 5, the size and arrangement of the actuator 100 can be adaptively changed according to the size and space of the actuator 100 itself, so that the space arrangement of the actuator 100 can be utilized more effectively. In addition to being able to be implemented, a region in which a magnetic force acts between the magnet 130 and the coil 140 may be expanded, so that a driving force for movement of the carrier 110 may be improved.

6 is a diagram showing the configuration of a magnet 130 according to a preferred embodiment of the present invention.

6(a), the common magnetic pole 130-1 of the magnet 130 is the lower part B of the upper coil 140-1 and the upper part U of the lower coil 140-2. And face to face. Therefore, even if the carrier 110 moves in the optical axis direction, the length D2 of the common magnetic pole 130-1 of the magnet 130 is the upper magnetic pole 130-2 of the magnet 130 and It is preferable to configure it to be longer than the lengths D1 and D3 (based on the optical axis direction) of the lower magnetic pole 130-3.

In addition, even if the upper coil 140-1 and the lower coil 140-2 of different sizes are applied according to the embodiment, the common stimulation of the magnet 130 within the scope of the technical idea of the present invention described above is maintained. The size of the regions of (130-1), the upper stimulation 130-2, and the lower stimulation 130-3 may be varied.

As described above, in the case of the present invention, it is not necessary to use a plurality of individual magnets as in the prior art, and since there is no need to separate the individual magnets so that they are sufficiently separated from each other, a magnet having a larger magnetic force is used when the same space It can be applied to improve the driving efficiency.

As shown in Figure 6, if the magnetic pole facing the coil 140 can be made of three poles, the magnet 130 of the present invention can be made of a three-pole magnetization, as well as a six-pole magnetization for the efficiency of the magnetization. Of course you can.

In the above, although the present invention has been described by limited embodiments and drawings, the present invention is not limited thereto, and the technical idea of the present invention and the following will be described by those of ordinary skill in the art to which the present invention pertains. It goes without saying that various modifications and variations are possible within the equal scope of the claims.

In the description of the present invention described above, modifiers such as first and second, upper, lower, upper, lower, etc. are only terms of instrumental concepts used to relatively distinguish components between each other, and thus a specific order, It should be interpreted that it is not a term used to indicate priority, etc.

The accompanying drawings for the description of the present invention and examples thereof may be shown in a somewhat exaggerated form in order to emphasize or highlight the technical content according to the present invention, but the contents described above and the items shown in the drawings are described. In consideration of this, it should be interpreted that it is obvious that examples of application of various types of modifications may be possible at the level of a person skilled in the art.

100: actuator
101: case 110: carrier
111: first guide rail 120: housing
121: second guide rail 130: magnet
130-1: common stimulus 130-2: upper stimulus
130-3: lower stimulation 140: coil part
140-1: upper coil 140-2: lower coil
150: circuit board 160: yoke

Claims (5)

A carrier on which a lens is mounted and linearly moves in the optical axis direction;
A housing accommodating the carrier;
A coil part provided on the same surface of the housing and including n (n is a natural number of 2 or more) coils disposed vertically with respect to the optical axis direction; And
It is mounted on the same side of the carrier and faces the coil part, and includes a magnet comprising n+1 magnetic poles arranged in a direction of the optical axis in a direction facing the coil part. Actuator. The method of claim 1, wherein the magnet,
A common stimulus located in the middle and consisting of either the N-pole or the S-pole; And
An actuator equipped with a multi-pole magnet structure, comprising an upper magnetic pole and a lower magnetic pole positioned above and below the common magnetic pole, respectively, having magnetic poles opposite to the common magnetic pole and relative to the optical axis direction. The method of claim 2, wherein a length of the common stimulus based on the direction of the optical axis is
The actuator with a multi-pole magnet structure, characterized in that longer than the lengths of the upper and lower magnetic poles based on the optical axis direction. The method of claim 2, wherein the n number of coils,
It includes an upper coil and a lower coil respectively positioned at the upper and lower sides based on the direction of the optical axis,
The common stimulus of the magnet is,
Face with the lower part of the upper coil and the upper part of the lower coil,
An actuator with a multi-pole magnet structure, characterized in that the upper magnetic pole of the magnet faces the upper part of the upper coil, and the lower magnetic pole of the magnet faces the lower part of the lower coil. The method of claim 4, wherein the upper coil and the lower coil,
An actuator equipped with a multi-pole magnet structure, characterized in that the directions of the applied power are opposite to each other.

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