KR20170001994A - Lens driving unit and camera module including the same - Google Patents

Abstract

According to an embodiment, a lens moving unit comprises: a housing supporting a first magnet; a bobbin having a first coil arranged in an internal side of the first magnet at an outer circumference, and moved in a first direction in the housing; a base arranged in a lower portion of the bobbin, having a stopper formed to protrude to be opposite to a lower surface of the bobbin; and a lower elastic member provided in a lower side of the bobbin. A contact blocking unit may be interposed between the bobbin and the stopper.

Description

[0001] The present invention relates to a lens driving apparatus and a camera module including the lens driving unit,

An embodiment relates to a lens driving apparatus and a camera module including the lens driving apparatus.

The contents described in this section merely provide background information on the embodiment and do not constitute the prior art.

In recent years, IT products such as mobile phones, smart phones, tablet PCs, and notebooks, which incorporate ultra-compact digital cameras, are actively under development.

In the case of a lens driving apparatus mounted on a small electronic device such as a smart phone and a camera module including the same, an apparatus for implementing auto focusing may be incorporated. Specifically, in order to realize auto focusing, the lens driving device may be equipped with a bobbin for moving the lens in the optical axis direction.

Such a bobbin frequently moves in the direction of the optical axis, so that it can repeatedly contact other parts of the lens driving apparatus. During this process, the contact areas of the bobbin and other parts may wear out.

Wear can cause worn particles of the bobbin and the parts in contact therewith. These particles may cause malfunction or breakage of the lens driving device.

In addition, such particles may block a part of the light incident on the lens or image sensor mounted on the camera module, and consequently reduce the quality of the image to be photographed. Therefore, improvement is required.

The present invention relates to a lens driving apparatus and a camera module including the lens driving apparatus, which can remarkably reduce generation of particles caused by abrasion and abrasion due to repeated contact between a bobbin and other parts housed in a lens driving apparatus.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

One embodiment of the lens driving device includes: a housing for supporting a first magnet; A bobbin having a first coil disposed on an inner circumferential surface of the first magnet and moving in a first direction within the housing; A base disposed at a lower portion of the bobbin and formed with a stopper protruding to face the lower surface of the bobbin; And a lower elastic member provided on a lower side of the bobbin, and a contact blocking portion may be interposed between the bobbin and the stopper.

The contact blocking portion may be formed on the lower elastic member.

The lower elastic member includes an inner frame coupled with the bobbin; An outer frame coupled with the housing; And a connecting member connecting the inner frame and the outer frame.

The contact blocking portion may be formed in a plate shape and integrally formed with the inner frame.

The contact blocking portion may be configured such that the upper surface thereof is opposed to a part of the lower surface of the bobbin and the lower surface thereof is opposed to the upper surface of the stopper.

The contact blocking portion may be formed in a plate shape and attached to an upper surface of the stopper so that the upper surface of the contact blocking portion is opposed to a part of the lower surface of the bobbin.

The contact blocking portion and the stopper may be spaced apart from each other in the second direction or the third direction perpendicular to the first direction.

The plurality of stoppers may be disposed radially with respect to the central portion of the base, and the contact breakers may be provided at the positions opposite to the top surface of the stoppers in the same number as the stoppers.

The bobbin and the stopper may be formed of a plastic material, and the contact blocking portion may be formed of a metal material.

The contact blocking portion may have a surface roughness lower than a surface roughness of a portion of the upper surface or the lower surface where the surface roughness of the bobbin or the stopper contacts the contact blocking portion.

One embodiment of the lens driving device may further include an upper elastic member provided on the upper side of the bobbin.

The contact blocking portion may block direct contact between the lower surface of the bobbin and the upper surface of the stopper.

Another embodiment of the lens driving device includes: a housing for supporting a first magnet; A bobbin having a first coil disposed on an inner circumferential surface of the first magnet and moving in a first direction within the housing; A base disposed at a lower portion of the bobbin and having a stopper protruded to face the lower surface of the bobbin; An upper elastic member provided on the upper side of the bobbin; A lower elastic member provided below the bobbin; And a contact blocking portion formed integrally with the lower elastic member and having an upper surface opposed to a part of the lower surface of the bobbin and a lower surface opposed to the upper surface of the stopper so as to block direct contact between the bobbin and the stopper can do.

Another embodiment of the lens driving device includes: a housing for supporting a first magnet; A bobbin having a first coil disposed on an inner circumferential surface of the first magnet and moving in a first direction within the housing; A base disposed at a lower portion of the bobbin and having a stopper protruded to face the lower surface of the bobbin; An upper elastic member provided on the upper side of the bobbin; A lower elastic member provided below the bobbin; And an abatement portion attached to an upper surface of the stopper and having an upper surface facing a part of the lower surface of the bobbin to block direct contact between the bobbin and the stopper.

One embodiment of the camera module comprises: an image sensor; And the lens driving apparatus described above.

In the embodiment, since the contact blocking portion is provided on the upper surface of the stopper and the lower surface of the bobbin corresponding to the upper surface of the stopper, the wear amount and the wear rate due to the direct contact between the stopper and the bobbin can be remarkably reduced. In addition, the amount of particles generated due to abrasion of the stopper and the bobbin can be remarkably reduced.

In addition, by significantly reducing the amount of particles generated, these particles can block some of the light incident on the lens or image sensor and prevent degradation of the quality of the image being photographed.

1 is a perspective view showing a lens driving apparatus according to an embodiment.
2 is an exploded perspective view showing a lens driving apparatus according to an embodiment.
3 is a perspective view illustrating a state in which a base and a lower elastic member are disposed according to an embodiment.
4 is a perspective view of a base according to one embodiment.
5 is a plan view of a lower elastic member according to an embodiment.
6 is a cross-sectional view showing a part of a lens driving apparatus according to an embodiment.
7 is a view showing part A of Fig.
8 is a perspective view showing a state in which a base and a lower elastic member are arranged according to another embodiment.
9 is a view showing a portion B in Fig.
10 is a sectional view showing a part of a lens driving apparatus according to another embodiment.
11 is a view showing a portion C in Fig.

Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. The embodiments are to be considered in all aspects as illustrative and not restrictive, and the invention is not limited thereto. It is to be understood, however, that the embodiments are not intended to be limited to the particular forms disclosed, but are to include all modifications, equivalents, and alternatives falling within the spirit and scope of the embodiments. The sizes and shapes of the components shown in the drawings may be exaggerated for clarity and convenience.

The terms "first "," second ", and the like can be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. In addition, terms specifically defined in consideration of the constitution and operation of the embodiment are only intended to illustrate the embodiments and do not limit the scope of the embodiments.

In the description of the embodiments, when it is described as being formed on the "upper" or "on or under" of each element, the upper or lower (on or under Quot; includes both that the two elements are in direct contact with each other or that one or more other elements are indirectly formed between the two elements. Also, when expressed as "on" or "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

It is also to be understood that the terms "top / top / top" and "bottom / bottom / bottom", as used below, do not necessarily imply nor imply any physical or logical relationship or order between such entities or elements, But may be used only to distinguish one entity or element from another entity or element.

Further, in the drawings, an orthogonal coordinate system (x, y, z) can be used. In the drawing, the x axis and y axis mean a plane perpendicular to the optical axis. For convenience, the optical axis direction (z axis direction) can be referred to as a first direction, the x axis direction as a second direction, and the y axis direction as a third direction .

1 is a perspective view showing a lens driving apparatus according to an embodiment. 2 is an exploded perspective view showing a lens driving apparatus according to an embodiment.

An auto focusing device applied to a small camera module of a mobile device such as a smart phone or a tablet PC is a device that automatically focuses an image of a subject on an image sensor (not shown).

Such an auto focusing apparatus can be variously configured. In the embodiment, the auto focus operation can be performed by moving the optical module including the plurality of lenses in the first direction.

As shown in FIG. 2, the lens driving apparatus according to the embodiment may include a movable portion. At this time, the movable part can perform the auto focusing function of the lens. The movable part may include a bobbin 110, a first coil 120, a first magnet 130, a housing 140, an upper elastic member 150, and a lower elastic member 160.

The bobbin 110 has a first coil 120 disposed on an outer circumferential surface of the first magnet 130 and a second coil 120 disposed on an inner side of the first magnet 130. The bobbin 110 has an electromagnetic interaction between the first magnet 130 and the first coil 120 And may be installed in the inner space of the housing 140 to reciprocate in the first direction. The first coil 120 may be installed on the outer circumferential surface of the bobbin 110 to enable electromagnetic interaction with the first magnet 130.

Further, the bobbin 110 is elastically supported by the upper and lower elastic members 150 and 160, and can perform the auto focusing function by moving in the first direction.

The bobbin 110 may include a lens barrel (not shown) in which at least one lens is installed. The lens barrel can be coupled to the inside of the bobbin 110 in various ways.

For example, female threads may be formed on the inner circumferential surface of the bobbin 110, male thread corresponding to the threads may be formed on the outer circumferential surface of the lens barrel, and the lens barrel may be coupled to the bobbin 110 by screwing.

However, the present invention is not limited thereto, and the lens barrel may be directly fixed to the inside of the bobbin 110 by a method other than screwing, without forming a thread on the inner circumferential surface of the bobbin 110. Alternatively, the one or more lenses may be formed integrally with the bobbin 110 without a lens barrel.

The lens coupled to the lens barrel may be composed of a single lens, or two or more lenses may be configured to form an optical system.

The auto focusing function is controlled according to the direction of the current, and the auto focusing function may be realized by moving the bobbin 110 in the first direction. For example, when the forward current is applied, the bobbin 110 can move upward from the initial position, and when the reverse current is applied, the bobbin 110 can move downward from the initial position.

Alternatively, the amount of unidirectional current may be adjusted to increase or decrease the movement distance from the initial position in one direction.

The upper and lower surfaces of the bobbin 110 may have a plurality of upper support protrusions and lower support protrusions. The upper support protrusion may be provided in a cylindrical shape or a prismatic shape, and the upper elastic member 150 may be engaged and fixed.

The lower support protrusions may be cylindrical or prismatic like the upper support protrusions, and the lower elastic members 160 may be engaged and fixed.

The upper elastic member 150 may be provided on the upper side of the bobbin 110 and the lower elastic member 160 may be provided on the lower side of the bobbin 110. At this time, the upper elastic member 150 may have a through hole corresponding to the upper supporting protrusion, and the lower elastic member 160 may have a through hole corresponding to the lower supporting protrusion. The support protrusions and the through holes may be fixedly joined by an adhesive member such as a thermal fusion adhesive or an epoxy.

The housing 140 has a hollow column shape for supporting the first magnet 130, and may be formed in a substantially rectangular shape. The first magnet 130 may be coupled to the housing 140. As described above, the bobbin 110, which is guided by the elastic members 150 and 160 and moves in the first direction, may be disposed inside the housing 140.

The housing 140 may have four flat sides. The side surface of the housing 140 may be formed to have an area corresponding to the first magnet 130 or larger. Each of the opposite side surfaces of the four sides of the housing 140 may have through holes or grooves for the magnets on which the pair of first magnets 130 are mounted.

Accordingly, the pair of first magnets 130 may be arranged symmetrically with respect to the center of the housing 140. If the first magnets 130 are disposed opposite to each other while being biased to one side irrespective of the center of the housing 140, the electromagnetic force acts on one side of the coil 120 of the bobbin 110, 110) may be tilted. Therefore, it is appropriate that the pair of first magnets 130 are arranged symmetrically with respect to the center of the housing 140.

In another embodiment, a pair of first magnets 130 may be disposed on opposite sides of the housing 140, and a pair of the first magnets 130 may be disposed on the center of the housing 140 May be arranged to be symmetrical with respect to each other.

The upper elastic member 150 and the lower elastic member 160 may be coupled to the bobbin 110 and the housing 140 and may be respectively provided on the upper side and the lower side of the bobbin 110 and the housing 140 .

The upper elastic member 150 and the lower elastic member 160 can elastically support the bobbin 110 in the first direction in the upward and downward directions. The upper elastic member 150 and the lower elastic member 160 may be formed of leaf springs.

As shown in FIG. 2, the lower elastic members 160 may be provided as two separate members. The divided portions of the lower elastic member 160 can be supplied with different polarities of current or different power sources through the two-divided structure.

A terminal 164 may be formed on each of the divided portions of the lower elastic member 160. Accordingly, the lower elastic member 160 can be connected to the printed circuit board (not shown) through the terminal 164, and can receive current or power from the printed circuit board.

Further, as an alternative embodiment, the upper elastic member 150 may have a two-piece structure, and the lower elastic member 160 may have an integral structure.

Meanwhile, the upper elastic member 150, the lower elastic member 160, the bobbin 110, and the housing 140 may be assembled through heat bonding and / or bonding using an adhesive or the like. At this time, for example, the fixing operation can be completed by bonding using an adhesive after fixing by heat fusion.

The base 210 may be disposed at a lower portion of the bobbin 110 and may have a substantially rectangular shape and may include a printed circuit board (not shown) and a lower elastic member 160. The cover member 300 can be coupled to the upper portion of the base 210 and the base 210 and the cover member 300 can be fixed and sealed with an adhesive or the like at respective ends contacting each other.

Meanwhile, a printed circuit board (not shown) may be coupled to one side of the housing 140. The printed circuit board may receive an external power source and apply a current or a power to the first coil 120 of the bobbin 110.

The cover member 300 may be provided in a substantially box shape, and may receive the moving part, a part of the printed circuit board, and the like, and may be coupled to the base 210.

The cover member 300 protects a moving part, a printed circuit board, and the like accommodated in the cover member 300 from being damaged. Particularly, an electromagnetic field generated by the first magnet 130, the first coil 120, The electromagnetic field can be focused by restricting leakage to the outside.

3 is a perspective view illustrating a state in which the base 210 and the lower elastic member 160 are disposed according to one embodiment. 4 is a perspective view illustrating the base 210 according to one embodiment. In the embodiment, a stopper 215 may be formed on the base 210.

The stopper 215 may protrude to face the lower surface of the bobbin 110. 4, a plurality of the stoppers 215 may be provided, and each of the stoppers 215 may be disposed radially with respect to a central portion of the base 210. As shown in FIG.

Although a total of four stoppers 215 are disposed in the embodiment, they may be provided in an appropriate number of two or more as long as they can be disposed radially with respect to the center of the base 210. The stopper 215 may prevent the bobbin 110 from falling in a set range but excessively lower the bobbin 110 in a downward direction.

Accordingly, the stopper 215 can function to set a range in which the bobbin 110 can be moved to the maximum in the lens driving apparatus. In addition, in the case of autofocusing, the bobbin 110 may be moved upward in the first direction while being placed on the stopper 215, so that the autofocusing function may be performed. Therefore, the stopper 215 may serve as a seating portion of the bobbin 110.

Meanwhile, a contact blocking part 900 may be interposed between the bobbin 110 and the stopper 215. In one embodiment, as shown in FIG. 3, the contact blocking portion 900 may be formed on the lower elastic member 160.

The contact blocking portion 900 may be formed such that its upper surface is opposed to a part of the lower surface of the bobbin 110 and the lower surface thereof is opposed to the upper surface of the stopper 215. That is, the contact blocking portion 900 is positioned on the lower surface of the bobbin 110 and the upper surface of the stopper 215 at a position where the bobbin 110 can directly contact the stopper 215, It is possible to prevent the stopper 215 from directly coming into direct contact with it.

5 is a plan view showing a lower elastic member 160 according to an embodiment. The lower elastic member 160 may include an inner frame 161, an outer frame 162, a connecting member 163, a terminal 164, and a contact blocking portion 900. Further, although the lower elastic members 160a and 160b are provided in a two-part structure in the embodiment, as described above, they may be provided as an integral structure.

As described above, in the inner frame 161 and the outer frame 162, through holes for coupling with the support protrusions formed on the bobbin 110 and the housing 140 are formed at positions corresponding to the support protrusions .

The inner frame 161 is formed on the inner side of the lower elastic member 160 and can be engaged with the bobbin 110. The outer frame 162 is formed on the outer side of the lower elastic member 160 and can engage with the housing 140.

The connecting member 163 may have one side coupled to the inner frame 161 and the other side coupled to the outer frame 162 to connect the inner frame 161 and the outer frame 162 .

Due to this structure, the bobbin 110 coupled to the lower elastic member 160 is elastically supported by the lower elastic member 160 and moves in the first direction to perform the auto focusing function.

On the other hand, the lower elastic member 160 may be provided with a contact blocking portion 900. For example, as shown in FIGS. 3 and 5, the contact blocking portion 900 may be formed in a plate shape and formed integrally with the inner frame 161.

In addition, the contact blocking portion 900 may be provided in the same number as the stopper 215 at a position facing the upper surface of the stopper 215. When the lower elastic member 160 is engaged with the housing 140 and the bobbin 110, the upper surface of the stopper 215 and the lower surface of the bobbin 110 are positioned, Direct contact can be blocked.

6 is a cross-sectional view showing a part of a lens driving apparatus according to an embodiment. 7 is a view showing part A of Fig. 6, in the embodiment, the upper surface of the stopper 215 and the lower surface of the bobbin 110 corresponding to the upper surface of the stopper 215 may be cut off by the contact blocking portion 900.

The lower surface of the bobbin 110 is in contact with the upper surface of the contact blocking portion 900 and the upper surface of the bobbin 110 is in contact with the contact blocking portion 900 And the bobbin 110 and the stopper 215 are not in direct contact with each other.

7, the lower elastic member 160 is disposed between the inner frame 161 coupled to the bobbin 110 and the outer frame 162 coupled to the housing 140, There can be a difference. At this time, the outer frame 162 may be positioned lower than the inner frame 161 in the first direction.

In the embodiment, the contact blocking portion 900 is provided to block the direct contact between the stopper 215 and the bobbin 110 for the following reasons. The contact blocking portion 900 may be formed of a material different from that of the stopper 215 or the bobbin 110.

For example, the bobbin 110 and the stopper 215 may be formed of a plastic material, and the contact blocking portion 900 may be formed of a metal material. Metal and plastic materials may have different surface roughnesses.

In an embodiment, the contact blocking portion 900 may be formed with a low surface roughness. That is, the contact blocking portion 900 may be formed to have a surface roughness lower than that of a portion where the surface roughness of the upper surface or the lower surface of the bobbin 110 or the stopper 215 is in contact with the contact blocking portion 900.

When the reliability test of the lens driving device is performed or when the bobbin 110 formed of a plastic material without the contact blocking part 900 and the stopper 215 come into direct repeated contact in actual use of the lens driving device, The lower surface of the bobbin 110 and the upper surface of the stopper 215 may be worn by such contact.

The portions worn by such contact can form particles. These particles may diffuse into the lens driving device, which may cause performance degradation or failure of the lens driving device.

In particular, such particles may block some of the light incident on the lens or image sensor, resulting in a reduction in the quality of the image being photographed.

When the plastic bobbin 110 and the stopper 215 are repeatedly in direct contact with each other, since the plastic is weak in abrasion and has a high surface roughness, abrasion can occur rapidly in a short period of time.

Particularly, when abrasion occurs due to direct contact between the bobbin 110 having a high surface roughness and the stopper 215, the surface roughness can play a large role in increasing the wear amount and wear rate.

Further, as the wear progresses, the surface roughness of the contact surface of each of the bobbin 110 and the stopper 215 can further increase. As the surface roughness increases, the wear amount and the wear rate can be further increased.

When the contact blocking portion 900 for blocking direct contact between the bobbin 110 and the stopper 215 is formed as in the embodiment, the lower portion of the bobbin 110 and the corresponding stopper 215 The wear amount and the wear rate of the upper surface portion of the abrasive article can be remarkably reduced because of the following reasons.

In the embodiment, the metal contact breaker 900 has a lower surface roughness than the plastic bobbin 110 and the stopper 215. On the other hand, as described above, the greater the roughness of the contact surface, the more the wear rate and wear amount increase.

Therefore, the bobbin 110 and the stopper 215 are formed on the upper and lower surfaces of the metal contact breaker 900, respectively, as compared with the case where the plastic bobbin 110 and the stopper 215 are in direct contact with each other, Contact between the stopper 215 and the bobbin 110 and the stopper 215 can significantly reduce the amount of wear and wear of the bobbin 110 and the stopper 215.

Also, the metal material has higher abrasion resistance than the plastic material. On the other hand, as described above, the surface roughness of each contact surface can be further increased as the wear progresses due to repeated contact, and the wear amount and wear rate can be further increased as the surface roughness is increased.

However, even if the plastic bobbin 110 and the stopper 215 are repeatedly brought into contact with the metal contact breaker 900, the contact breaker 900 made of a metal having high abrasion resistance has almost no increase in surface roughness No or very small.

Therefore, since the surface roughness of the contact blocking portion 900 hardly increases, the increase of the abrasion speed and wear amount of the bobbin 110 and the stopper 215 due to the increase of the surface roughness can be remarkably reduced.

As a result, since the contact blocking portion 900 is provided on the upper surface of the stopper 215 and the lower surface of the bobbin 110 corresponding to the upper surface of the stopper 215, the wear amount due to the direct contact between the stopper 215 and the bobbin 110, The wear rate can be remarkably reduced. In addition, the amount of particles generated due to wear of the stopper 215 and the bobbin 110 can be remarkably reduced.

In addition, by significantly reducing the amount of particles generated, these particles can block some of the light incident on the lens or image sensor and prevent degradation of the quality of the image being photographed.

8 is a perspective view showing a state in which the base 210 and the lower elastic member 160 are arranged according to another embodiment. 9 is a view showing a portion B in Fig. In an embodiment, the contact blocking portion 900 is formed in a plate shape and may be attached to the upper surface of the stopper 215 by an adhesive.

At this time, the adhesive may be an epoxy, a thermosetting adhesive, an ultraviolet ray-curable adhesive, or the like. The plate-like contact blocking portion 900 may be formed in a shape corresponding to the upper surface of the stopper 215 by cutting or etching the metal plate.

8 and 9, for example, when the difference between the height at which the lower elastic member 160 is disposed in the first direction and the height at the upper surface of the stopper 215 is relatively large . ≪ / RTI >

That is, when the upper surface of the stopper 215 is positioned higher than the position where the lower elastic member 160 is disposed in the first direction, the lower elastic member 160 may be provided with a contact blocking portion The contact blocking portion 900 can be disposed on the upper surface of the stopper 215.

At this time, the contact blocking portion 900 may be provided in the same number as the stopper 215 on the upper surface of each stopper 215 in a plurality of radial directions. In addition, the contact blocking portion 900 may be formed such that its upper surface is opposed to a part of the lower surface of the bobbin 110.

Due to such a structure, the contact blocking portion 900 intervenes between the upper surface of the stopper 215 and the lower surface of the bobbin 110 corresponding thereto, thereby blocking the direct contact between the stopper 215 and the bobbin 110 can do.

As described above, the contact blocking portion 900 may be formed of a material different from the stopper 215 or the bobbin 110. For example, the bobbin 110 and the stopper 215 may be formed of a plastic material, and the contact blocking portion 900 may be formed of a metal material.

8 and 9, the contact blocking portion 900 and the stopper 215 are spaced apart from the lower elastic member 160 in the second direction or the third direction perpendicular to the first direction, .

That is, it is appropriate that the contact blocking portion 900 and the stopper 215 are disposed so as not to interfere with the lower elastic member 160 for smooth operation of the lower elastic member 160. 8 and 9, for example, the contact blocking portion 900 and the stopper 215 are disposed between the inner frame 161 and the outer frame 162 of the lower elastic member 160, The connecting portion of the lower elastic member 160 may be formed to avoid the contact blocking portion 900 and the stopper 215.

10 is a sectional view showing a part of a lens driving apparatus according to another embodiment. 11 is a view showing a portion C in Fig. 10 and 11, in the embodiment, the upper surface of the stopper 215 and the lower surface of the bobbin 110 corresponding to the upper surface of the stopper 215 can be cut off by the contact blocking portion 900.

11, the lower elastic member 160 is disposed between the inner frame 161 coupled to the bobbin 110 and the outer frame 162 coupled to the housing 140, There can be a difference. At this time, the outer frame 162 may be positioned lower than the inner frame 161 in the first direction.

The lower surface of the bobbin 110 may be in contact with the upper surface of the contact blocking portion 900 while the bobbin 110 is seated on the stopper 215. At this time, even when the bobbin 110 moves upward and downward in the first direction to repeatedly mount and separate on the stopper 215, contact and separation are made only between the lower surface of the bobbin 110 and the upper surface of the contact blocking portion 900 The contact blocking portion 900 which is bonded to the upper surface of the stopper 215 by an adhesive is not separated from the upper surface of the stopper 215. [

Therefore, the upper surface portion of the stopper 215, which is not separated from the contact blocking portion 900, does not substantially wear due to repetition of contact and spacing, or the occurrence of abrasion is remarkably small.

The bobbin 110 and the contact blocking portion 900 may also be formed between the lower surface of the bobbin 110 formed of a plastic material and the upper surface of the contact blocking portion 900 formed of a metal material, 900), and the wear rate can be remarkably reduced. Due to the above structure, the amount of particles generated by the abrasion of the stopper 215, the contact blocking portion 900, and the bobbin 110 can be significantly reduced.

Meanwhile, the lens driving apparatus according to the above-described embodiments can be used in various fields, for example, a camera module. For example, the camera module can be applied to a mobile device such as a mobile phone.

The camera module according to the embodiment may include a lens barrel coupled to the bobbin 110, and an image sensor (not shown). At this time, the lens barrel may include at least one lens that transmits an image to the image sensor.

In addition, the camera module may further include an infrared cut filter (not shown). The infrared cut filter serves to block the infrared light from entering the image sensor.

In this case, in the base 210 illustrated in FIG. 2, an infrared cutoff filter may be installed at a position corresponding to the image sensor, and may be combined with a holder member (not shown). Further, the holder member can support the lower side of the base 210.

A separate terminal member may be provided on the base 210 for energizing the printed circuit board, or a terminal may be integrally formed using a surface electrode or the like.

Meanwhile, the base 210 may function as a sensor holder for protecting the image sensor. In this case, a protrusion may be formed downward along the side surface of the base 210. However, this is not essential, and although not shown, a separate sensor holder may be disposed below the base 210 to perform its role.

While only a few have been described above with respect to the embodiments, various other forms of implementation are possible. The technical contents of the embodiments described above may be combined in various forms other than the mutually incompatible technologies, and may be implemented in a new embodiment through the same.

110: Bobbin
120: first coil
130: first magnet
140: housing
150: upper elastic member
160: Lower elastic member
161: inner frame
162: outer frame
163:
164: terminal
210: Base
215: Stopper
900:

Claims (15)

A housing for supporting the first magnet;
A bobbin having a first coil disposed on an inner circumferential surface of the first magnet and moving in a first direction within the housing;
A base disposed at a lower portion of the bobbin and formed with a stopper protruding to face the lower surface of the bobbin; And
And a lower elastic member provided below the bobbin,
And a contact blocking portion is interposed between the bobbin and the stopper. The method according to claim 1,
And the contact blocking portion is formed on the lower elastic member. 3. The method of claim 2,
The lower elastic member
An inner frame coupled with the bobbin;
An outer frame coupled with the housing; And
And a connecting member connecting the inner frame and the outer frame. The method of claim 3,
Wherein the contact-
Wherein the inner frame is formed integrally with the inner frame. 3. The method of claim 2,
Wherein the contact-
Wherein the upper surface is opposed to a part of the lower surface of the bobbin and the lower surface is opposed to the upper surface of the stopper. The method according to claim 1,
Wherein the contact blocking portion is formed in a plate shape and is attached to an upper surface of the stopper, and the upper surface of the contact blocking portion is opposed to a part of the lower surface of the bobbin. The method according to claim 6,
Wherein the contact blocking portion and the stopper are spaced apart from each other in a second direction or a third direction perpendicular to the first direction. The method according to claim 1,
Wherein the plurality of stoppers are disposed radially with respect to the center of the base, and the contact blocking portions are provided in the same number as the stoppers at positions opposed to the upper surface of the stopper. The method according to claim 1,
Wherein the bobbin and the stopper are made of a plastic material, and the contact breaker is made of a metal material. The method according to claim 1,
Wherein the contact-
Wherein the surface roughness of the upper surface or the lower surface is lower than the surface roughness of the portion where the surface roughness of the upper surface or the lower surface is in contact with the contact blocking portion of the bobbin or the stopper. The method according to claim 1,
And an upper elastic member provided on the upper side of the bobbin. The method according to claim 1,
And the contact blocking portion blocks direct contact between the lower surface of the bobbin and the upper surface of the stopper. A housing for supporting the first magnet;
A bobbin having a first coil disposed on an inner circumferential surface of the first magnet and moving in a first direction within the housing;
A base disposed at a lower portion of the bobbin and having a stopper protruded to face the lower surface of the bobbin;
An upper elastic member provided on the upper side of the bobbin;
A lower elastic member provided below the bobbin; And
A stopper which is integrally formed with the lower elastic member and whose upper surface is opposed to a part of the lower surface of the bobbin and whose lower surface is opposed to the upper surface of the stopper,
And the lens driving device. A housing for supporting the first magnet;
A bobbin having a first coil disposed on an inner circumferential surface of the first magnet and moving in a first direction within the housing;
A base disposed at a lower portion of the bobbin and having a stopper protruded to face the lower surface of the bobbin;
An upper elastic member provided on the upper side of the bobbin;
A lower elastic member provided below the bobbin; And
A stopper attached to an upper surface of the stopper and having an upper surface opposed to a part of a lower surface of the bobbin to prevent direct contact between the bobbin and the stopper,
And the lens driving device. Image sensor; And
A camera module comprising the lens driving device according to any one of claims 1 to 14.

Images