KR20230104848A - Motor for actuating lens - Google Patents

Abstract

Embodiments include a housing including a body having a through hole in the center and two or more support parts formed at corners of the body; a magnet unit having at least two or more magnets formed in a shape that can be disposed between opposite surfaces of each of the support units; and a coil unit disposed to correspond to an inner surface of the magnet unit.

Description

Lens drive motor {MOTOR FOR ACTUATING LENS}

An embodiment of the present invention relates to a lens driving motor and a camera module having an improved structure.

In the conventional camera module, foreign substances may be generated when the magnet is assembled to the housing, and such foreign substances may remain inside the camera module and deteriorate camera performance.

In addition, the process of assembling the housing and the magnet having a conventional structure has a problem in that the overall manufacturing cost of the camera module may increase.

In addition, the conventional camera module has a high thickness according to the coupling structure of the housing and the magnet, so there is a need to reduce it.

(001) Korean Patent Publication No. 10-2012-0059844 (2012.06.11) (002) Korean Patent Publication No. 10-2012-0065492 (2012.06.21)

Embodiments are to simplify the manufacturing process and provide a camera module with improved reliability.

Embodiments include a housing including a body having a through hole in the center and two or more support parts formed at corners of the body; a magnet unit having at least two or more magnets formed in a shape that can be disposed between opposite surfaces of each of the support units; and a coil unit disposed to correspond to an inner surface of the magnet unit.

On the other hand, the embodiment is a cover can formed with an opening on the upper side and an open lower side; a housing having a through hole corresponding to the opening and corresponding to the inner surface of the cover can, and including two or more support parts formed at corners of the body and accommodated in the cover can; a magnet unit having at least two or more magnets formed in a shape that can be disposed between opposite surfaces of each of the support units; a base coupled to the housing; a mover including a coil part disposed to correspond to the magnet part and a bobbin disposed on an outer surface of the coil part; and a substrate for applying power to the coil unit.

In addition, the magnet may be formed such that a length of a surface in contact with the support is the same as that of the support.

In addition, the magnet may be formed such that a length of a surface in contact with the support is shorter than a length of the support.

In addition, the support part may be disposed at each of the four corners of the body.

In addition, each of the support portions may be formed in a rectangular shape, and a surface or corner in the direction of the optical axis may be formed with a curved portion formed at a predetermined distance from the through hole.

In addition, a fixing groove may be formed at a lower side of each support part, and a fixing protrusion corresponding to the fixing groove of the support part may be formed in the base.

In addition, at least two or more stoppers protruding from the upper surface of the body to absorb external impact may be formed at a predetermined interval.

The lower spring may further include an outer portion fixed between the mover and the housing, an inner portion supporting a lower surface of the bobbin, and a connection portion connecting the outer portion and the inner portion.

The upper spring may further include an outer portion fixed to the housing, an inner portion supporting an upper surface of the bobbin, and a connection portion connecting the outer portion and the inner portion.

In addition, a seating groove in which the outer portion is seated may be formed on an upper surface of the body.

According to an embodiment of the present invention, a lens driving motor and a camera module with improved reliability can be implemented by improving the coupling structure of the housing and the magnet unit to simplify the assembly process and improve durability.

1 is an exploded perspective view of a lens driving motor according to an embodiment of the present invention;
2 is a perspective view of a housing according to an embodiment of the present invention;
3 is a view showing a magnet part coupled to a housing according to an embodiment of the present invention;

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

Unless otherwise defined, all terms in this specification have the same general meaning as understood by those skilled in the art, and if a term used in this specification conflicts with the general meaning of the term, the definition used in this specification shall apply.

However, the invention to be described below is not intended to limit the scope of the present invention only for explaining the embodiments of the present invention, and the same reference numerals used throughout the specification indicate the same components.

Hereinafter, the camera module of the embodiment will be described in detail with reference to the drawings.

1 is an exploded perspective view of a lens driving motor according to an embodiment of the present invention, FIG. 2 is a perspective view of a housing according to an embodiment of the present invention, and FIG. 3 shows a magnet unit coupled to a housing according to an embodiment of the present invention. it is a drawing

Referring to FIG. 1 , the lens driving motor according to the embodiment may largely include a stator 200 including a cover can 100, a housing 210, and a magnet unit 230, and the stator 200 may further include a base 240.

In addition, the lens driving motor according to the embodiment may further include a mover 300 that is disposed inside the housing 210 and moves, and the mover 300 is supported by an upper spring 221 to be described later. It can be.

The cover can 100 accommodates the mover 300 and the stator 200 to be described later and is mounted on the base 240 to form the exterior of the camera module. As shown, the cover can 100 may be formed in the shape of a rectangular parallelepiped in which the opening 110 is formed on the upper side and the lower side is open, but the shape of the cover can 100 may be formed in various ways. there is. In short, the shape of the cover can 100 may be a quadrangular shape or an octagonal shape when viewed from above, but is not limited thereto.

The inner surface of the cover can 100 is in close contact with the side surface of the base 240 to be described later so that the lower surface can be closed by the base 240, protecting internal components from external impact and at the same time external contamination. It may have a material penetration prevention function.

In addition, the cover can 100 may also perform a function of protecting components of the camera module from external radio wave interference generated by a mobile phone or the like. Accordingly, the cover can 100 may be formed of a metal material, but may also be formed of various materials such as an injection-molded product or an insert injection-molded product using a metal material.

In addition, although not shown, the cover can 100 may additionally include at least one fastening piece (not shown) formed on at least one surface of the lower end, and the base 240 has a fastening groove into which the fastening piece is inserted (not shown). When) is formed on the side, a more robust sealing function and fastening function of the camera module can be implemented.

1 to 3, the housing 210 may be formed in a shape corresponding to the inner surface of the cover can 100, and may include a body 211 and two or more support parts 212. can

The body 211 has a through hole 211a corresponding to the opening 110 formed in the center and may be formed to correspond to the inner surface of the cover can 100, so that the housing 210 is formed in the cover can ( 100) can be fixed to the inside.

In addition, at least two or more stoppers 211b protruding from the upper surface of the body 211 to absorb external impact may be formed at a predetermined interval. The stopper 211b may be integrally formed at the edge of the housing 210, and may be formed on the bobbin 310 to be described later, or may not be formed.

In addition, a seating groove 211c in which an outer portion 221a of the upper spring 221, which will be described later, is seated may be formed on an upper surface of the body 211. Each corner of the upper side may be formed in an arc shape, but is not limited thereto.

The support part 212 may be formed on the outer side or lower side of the body 211, and the support part 212 is fastened with a base 240 to be described later to secure the housing 210 inside the cover can 100. allow it to be firmly fixed. Specifically, the support part 212 is disposed at each of the four corners of the body 211 to stably fix the body 211 inside the cover can 100 . Also, the support parts 212 may be formed at regular intervals.

In addition, each of the support portions 212 may be formed in a rectangular shape, and the facing surface or corner of the support portion 212 is a curved portion 212a formed spaced apart from the through hole 211a by a predetermined distance. It may be formed to include. The curved portion 212a may be formed to eliminate mutual interference between the support portion 212 and the bobbin 310 when the bobbin 310 of the mover 300 to be described later moves in the optical axis direction. Accordingly, each of the support portions 212 may be formed in any shape that does not include the curved portion 212a as long as the shape does not interfere with the driving of the bobbin 310 . That is, the support part 212 may be formed as a flat part.

In addition, each of the support parts 212 has a fixing groove 212b formed thereon, and is coupled with a fixing protrusion 241 of the base 240 to be described later to maintain a firm coupling. In addition, the fixing groove 212b may be formed other than the facing surface between the support parts 212 and may be formed on an outer surface of the support part 212 . In addition, each of the support parts 212 may be coupled to the base without the fixing groove 212b being formed. The fixing groove 212b of the support part 212 includes a first part disposed on the opposite side of the surface facing the bobbin, a second part connected to one side of the first part, and a third part connected to the other side of the first part. can include

The magnet part 230 may include at least two or more magnets formed in a shape that can be disposed between opposite surfaces of the support parts 212 . Specifically, each of the four magnets constituting the magnet part 230 is formed so that the outer surface can be interviewed with the inner surface of the cover can 100, and both sides can be interviewed with the support part 212 facing each other. It can be.

Here, the length of the surface in contact with the support may be the same as the length of the support, or the length of the surface in contact with the support may be shorter than the length of the support. That is, these magnets face the housing only on the top and both sides, and are disposed on the housing 210 with the lower side exposed. This structural shape can reduce the height of the lens driving motor by substantially removing the lower end of the housing. In addition, bonding and fixation may be performed by adding an adhesive material such as epoxy to a surface in contact with the magnet and the support part 212 .

In the embodiment, the support portion 212 is formed at the corner of the body 211 so that each magnet is formed in a rectangular shape, but if the support portion 212 is formed at the center of each side of the body 211, the Each magnet may be formed in the shape of a prism such as an 'L'-shaped bent piece or a triangular pillar or trapezoidal pillar, and may be disposed at a corner of the cover can. In addition, the magnet may be processed to have a partially curved edge during processing.

One end of the upper spring 221 may be seated and fixed in the seating groove 211c of the housing 210, and the other end may be coupled to the upper surface of the bobbin 310 to be described later to support the bobbin 310, , It may be provided to provide restoring force to the original position when the bobbin 310 moves upward. In addition, the other end may have holes or grooves formed to correspond to protrusions formed on the upper surface of the bobbin 310 and fixed by thermal fusion or bonding.

The upper spring 221 may be formed as a plate spring, and an outer portion 221a seated and fixed in the seating groove 211c of the body 211 and an inner portion supporting the upper surface of the bobbin 310. (221b) and a connection portion (221c) connecting the outer portion (221a) and the inner portion (221b) may be included. The connecting portion 221c may be disposed from a portion of the upper side of the body 211 to the inside of the through hole 211a, and may be formed by bending one or more times.

In addition, a lower spring 222 may be further included in addition to the upper spring 221 . The lower spring 222 includes an outer portion 222a on the upper portion of the base, an inner portion 222b supporting the lower surface of the bobbin 310, and a connecting portion 222c connecting the outer portion 222a and the inner portion 222b. ) may be included. The outer part may be disposed on the upper surface of the base or may be disposed between the base and the housing.

Here, the upper spring 221 and/or the lower spring 222 may have a ring shape or a square shape, but are not limited thereto, and may be changed according to design, and the inner circumference corresponds to the shape of the bobbin. It is made of a substantially circular shape as much as possible, and the outer circumference may be made of a substantially rectangular shape so that it can be supported in the shape of the housing 210 and/or the base 240, but is not limited thereto.

The upper spring 221 or the lower spring 222 may be electrically connected to the winding of the coil unit 320 to transmit a current applied from a substrate to be described later. In addition, when the spring serves as a terminal for transmitting current applied from the board, the upper spring or the lower spring may include two separate springs. The two separate springs are electrically insulated from each other and spaced apart. In addition, for electrical connection with a substrate, which will be described later, the two separate springs may further include a bending portion bent toward the substrate, and may be connected to the substrate through the bending portion. The bending part may protrude in a direction opposite to the bobbin based on the base 240 through a hole or groove formed in the base 240 .

The base 240 may be fastened to the housing 210 to close the open lower surface of the cover can 100 . The base 240 may have fixing protrusions 241 corresponding to the fixing grooves 212b of the support part 212 formed on the upper side, and the outer surface of each fixing protrusion 241 is the cover can 100 The inner surface of the interview, the other surface may be interviewed to the fixing groove (212b) of the housing (210). Alternatively, the fixing groove may be formed on the base and the fixing protrusion may be formed on the housing. In addition, the base may be combined with the cover can by forming a groove on a certain portion or the entire circumference of the base without a separate fixing protrusion. The groove portion serves to guide the coupling position with the cover can and to prevent the cover can from protruding outward.

That is, the base 240 of the embodiment may be coupled to the housing 210, and the base may be coupled to the cover can 100, so that the base and the housing may be fixed inside the cover can. Such a structural shape makes it possible to more simply implement the assembly process of the lens driving motor, and at the same time, it is possible to seek solid fixation after fastening.

In addition, the base 240 may include a recessed portion 242 recessed downward on an upper surface so that a bobbin 310 to be described below may be disposed thereon, and at the center of the recessed portion 242 A through hole 243 corresponding to a lens unit to be described later may be formed. The bobbin may be in contact with the upper surface of the base at an initial position where no current is applied, or may be spaced apart from each other. In addition, a recess may or may not be formed on the upper surface of the base, and depending on the design, the bobbin and the base may be in contact or separated from each other at an initial position where no current is applied, regardless of whether there is a recess or not.

The base 240 may function as a sensor holder for protecting an image sensor (not shown) to be described later, and in this case, a protrusion may be formed downward along a side surface of the base 240 . In addition, the base 240 may have a filter seating groove for positioning a filter (not shown). The filter seating groove may be formed on an upper or lower surface of the base, or may be formed in a separate sensor holder.

In this case, the filter may be mounted in the through hole 243 formed in the center of the base 240, and an infrared ray filter or a blue filter may be provided. In addition, the IR filter may be formed of, for example, a film material or a glass material, and an infrared blocking coating material or the like may be disposed on a flat optical filter such as a cover glass for protecting an imaging surface or a cover glass.

In addition, in the case where the filter is installed on the outside of the lens (not shown), the filter may be coated on the lens surface to block infrared rays without being separately configured.

In addition, although not shown, when the cover can 100 includes a fastening piece, a fastening groove (not shown) that can be coupled with the fastening piece (not shown) is formed on the outer surface of the base 240. can These fastening grooves are formed locally on the outer surface of the base 240 in a shape corresponding to the length of the fastening piece, or a predetermined portion of the lower end of the cover can 100 including the fastening piece can be inserted into the base 240. ) can be formed entirely on the outer surface.

The mover 300 may largely include a coil part 320 and a bobbin 310 .

The bobbin 310 may be coupled to a lens unit to be described later to fix the lens unit, and the coupling method between the lens unit and the bobbin 310 is a screw thread formed on an inner circumferential surface of the bobbin 310 and an outer circumferential surface of the lens unit, respectively. A coupling method may be used, but it may also be coupled by a threadless method using an adhesive. Of course, even in the screw thread coupling method, after screw thread coupling, an adhesive may be used to promote more robust mounting between the two.

In addition, although not shown, a guide part may be formed on the outer circumferential surface of the bobbin 310 to guide winding or mounting of the coil part 320 to be described later. The guide part may be integrally formed with the outer surface of the bobbin 310, and may be continuously formed along the outer surface of the bobbin 310 or may be formed spaced apart at predetermined intervals. In addition, a step (not shown) to which a pre-wound coil unit can be mounted may be formed on an outer circumferential surface of the bobbin, and the pre-wound coil may be positioned and fixed to the bobbin through the step.

In addition, although not shown, an upper spring 221 provided on the upper side and/or lower side of the bobbin 310 so that the bobbin 310 can be supported on the upper side of the base 240 to be described later, and/or A fastening protrusion to which the lower spring 222 is fastened may be formed. The shape of the fastening protrusion may be a circular shape or an angular shape such as a cylindrical shape or a square column shape, or may have a combination thereof.

The coil part 320 may be guided by the guide part and wound on the outer surface of the bobbin 310, or a pre-wound coil part 320 may be mounted on the guide part. Alternatively, four individual coils may be disposed on the outer surface of the bobbin 310 at intervals of 90°. The coil unit 320 may receive power applied from a substrate to be described later and interact with the magnet unit to form an electromagnetic field.

On the other hand, the lens driving motor according to the embodiment may be mounted on a camera module, and this camera module is used in a variety of multimedia fields such as mobile phones or notebook personal computers, camera phones, PDAs, smart devices, toys, and even surveillance It can be provided in an image input device such as a camera or an information terminal of a video tape recorder.

In short, when the lens driving motor according to the embodiment is provided in the camera module, the camera module may further include a lens unit (not shown), a substrate, an image sensor, and the like, although not shown.

The lens unit (not shown) may be a lens barrel, but is not limited thereto, and may include any holder structure capable of supporting a lens. In the embodiment, a case in which the lens unit is a lens barrel will be described as an example.

The lens unit is disposed above the base 240 and is disposed at a position corresponding to an image sensor to be described later. The lens unit may include one or more lenses (not shown).

The substrate (not shown) may be implemented as a printed circuit board, an image sensor (not shown) may be mounted in the center of the upper side, and various elements (not shown) for driving the camera module may be installed. can be mounted.

In addition, the printed circuit board may be electrically connected to the terminal part or the lower spring 222 or the upper spring 221 or directly to the coil part 320 in order to apply power for driving the lens driving motor according to the embodiment. can In order to drive the lens driving motor, current must be applied to the coil unit. For this purpose, current can be directly applied from the board to the coil unit, and also, indirectly through a separate terminal or through a spring, to the coil unit. Current can be applied to

The image sensor (not shown) may be mounted on a central portion of an upper side surface of the printed circuit board to be positioned along an optical axis direction with one or more lenses (not shown) accommodated in the lens unit. Such an image sensor converts an optical signal of an object incident through a lens into an electrical signal.

The adhesive may be implemented as a thermosetting epoxy or UV epoxy, and is cured by exposure to heat or UV. However, if a thermosetting epoxy is used, it is a method of curing by moving to an oven or by directly applying heat, and if a UV (ultraviolet ray) epoxy is used, it is a method of curing by applying UV (ultraviolet rays) to the adhesive.

In addition, the adhesive may be an epoxy capable of both thermal curing and UV (ultraviolet ray) curing, and may be an epoxy capable of both thermal curing and UV (ultraviolet ray) curing, and may be cured by selecting one of the two. The adhesive is not limited to the epoxy, and any adhesive material can be substituted.

That is, the embodiment has a structure that can be miniaturized by reducing the height of the lens driving motor by improving the structure of the housing 210, and since this structure can be implemented in a simplified component shape compared to the prior art, the assembly process It is possible to implement a lens driving motor and camera module with improved reliability due to simplification, reduction of assembly tolerance, reduction of defective products, and enhancement of durability.

As described above, those skilled in the art will know that various changes and modifications are possible without departing from the technical spirit of the present invention, and the technical scope of the present invention is not limited to the contents described in the embodiments, but claims It must be determined by the scope and its equivalent scope.

100: cover can 200: stator
210: housing 211: body
211b: stopper 211c: seating groove
212: support part 212a: curved part
212b: fixing groove 221: upper spring
230: magnet part 240: base
241: fixed protrusion 300: mover
310: bobbin 320: coil part

Claims (17)

a cover including a top plate including an opening and side plates extending from the top plate;
a housing disposed within the cover;
a bobbin disposed within the housing;
a coil disposed on the bobbin;
a magnet part disposed in the housing and facing the coil;
a base coupled to the side plate of the cover;
an upper elastic member disposed between the upper plate of the cover and the housing; and
And a lower elastic member disposed between the bobbin and the base,
The housing includes a body including first to fourth corner portions, and a plurality of support portions extending from the first to fourth corner portions of the body, respectively;
The plurality of supports include first to fourth supports,
The magnet part includes first to fourth magnets,
The first magnet is disposed between the first and second support parts, the second magnet is disposed between the second and third support parts, and the third magnet is disposed between the third and fourth support parts. , The fourth magnet is disposed between the fourth support part and the first support part,
The magnet part includes an upper surface facing the lower surface of the housing, a lower surface disposed opposite to the upper surface, and first and second side surfaces connecting the upper surface and the lower surface and facing the plurality of support parts,
The housing surrounds the top surface, the first side surface, and the second side surface of the magnet part,
The lower elastic member includes an inner portion coupled to a lower surface of the bobbin, an outer portion disposed outside the inner portion, and a connection portion connecting the inner portion and the outer portion,
The lower elastic member is disposed between the magnet part and the base,
The lower surface of the magnet unit is disposed to face the outer portion of the lower elastic member. According to claim 1,
Each of the plurality of support parts of the housing includes a first part disposed on the opposite side of the surface facing the bobbin, a second part connected to one side of the first part, and a third part connected to the other side of the first part. including,
The lens driving motor wherein the first portion of the plurality of supporters is coupled to the side plate of the cover. According to claim 1,
A length of the magnet part in the optical axis direction is equal to a length in a direction corresponding to the first to fourth support parts. According to claim 1,
The lens driving motor of claim 1 , wherein the magnet portion overlaps the outer portion of the lower elastic member in an optical axis direction. According to claim 1,
The lens driving motor contacting the inner surface of the side plate of the cover. According to claim 1,
The plurality of support portions extend along the side plate of the cover lens driving motor. According to claim 1,
The upper elastic member includes an inner portion coupled to the upper surface of the bobbin, an outer portion disposed outside the inner portion, and a connection portion connecting the inner portion and the outer portion,
The body of the housing includes a groove recessed from the upper surface of the body and in which the outer portion of the upper elastic member is disposed, and a stopper protruding from the upper surface of the body,
The groove and the stopper are disposed in the first to fourth corner portions of the housing, respectively, and the groove includes four grooves spaced apart from each other,
The groove of the body includes a round shape,
The outer portion of the upper elastic member includes a portion formed to correspond to the groove of the body. According to claim 7,
The groove of the body is open toward the inner surface of the housing,
The groove of the body includes a first surface disposed at a position lower than the upper surface of the housing,
The first surface of the groove of the body is connected to the inner surface of the housing,
The upper surface of the body is disposed higher than the first surface of the groove of the body so that the groove of the body and the stopper form a two-step step on the upper surface of the body, and the upper surface of the stopper is disposed above the first surface of the body. A lens driving motor disposed higher than the upper surface. According to claim 1,
The plurality of supports include an inner circumferential surface facing the bobbin,
The inner circumferential surface of the plurality of support parts is formed as a lens driving motor. According to claim 7,
The plurality of support portions include grooves that are recessed inward from edges of the first to fourth corner portions of the housing,
At least a portion of the stopper overlaps the plurality of support portions of the housing in an optical axis direction. According to claim 7,
The lens driving motor is disposed such that the stopper is in contact with an inner surface of the top plate of the cover. image sensor;
The lens driving motor of claim 1;
A camera module including a lens coupled to the bobbin of the lens driving motor. A mobile phone comprising the camera module of claim 12. a cover including a top plate including an opening and side plates extending from the top plate;
a housing disposed within the cover;
a bobbin disposed within the housing;
a coil disposed on the bobbin;
a magnet part disposed in the housing and facing the coil;
a base coupled to the side plate of the cover; and
And an upper elastic member disposed between the upper plate of the cover and the housing,
The housing includes a body including first to fourth corner portions, and a plurality of support portions extending from the first to fourth corner portions of the body, respectively;
The plurality of supports include first to fourth supports,
The magnet part includes first to fourth magnets,
The first magnet is disposed between the first and second support parts, the second magnet is disposed between the second and third support parts, and the third magnet is disposed between the third and fourth support parts. , The fourth magnet is disposed between the fourth support part and the first support part,
The magnet part includes an upper surface facing the lower surface of the housing, a lower surface disposed opposite to the upper surface, and first and second side surfaces connecting the upper surface and the lower surface and facing the plurality of support parts,
The housing surrounds the top surface, the first side surface, and the second side surface of the magnet part,
Each of the plurality of support parts of the housing includes a first part disposed on the opposite side of the surface facing the bobbin, a second part connected to one side of the first part, and a third part connected to the other side of the first part. contains a part,
Each of the plurality of support parts of the housing includes a first part disposed on the opposite side of a surface facing the bobbin,
The lens driving motor wherein the first portion of the plurality of supporters is coupled to the side plate of the cover. According to claim 14,
A length of the magnet part in the optical axis direction is equal to a length in a direction corresponding to the first to fourth support parts. According to claim 14,
The lens driving motor contacting the inner surface of the side plate of the cover. a cover including a top plate including an opening and side plates extending from the top plate;
a housing disposed within the cover;
a bobbin disposed within the housing;
a coil disposed on the bobbin;
a magnet part disposed in the housing and facing the coil;
a base coupled to the side plate of the cover; and
A lens driving motor comprising an upper elastic member disposed between the upper plate of the cover and the housing.

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