KR102397326B1 - Motor for actuating lens - Google Patents

Abstract

The embodiment includes a body having a through-hole formed in the center, and a housing including two or more supporting parts formed at corners of the body; a magnet portion having at least two or more magnets formed in a shape that can be disposed between opposite surfaces of each of the support portions; and a coil part disposed to correspond to the inner surface of the magnet part; provides a lens driving motor comprising a.

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 occur when assembling the magnet in the housing, and these foreign substances may remain inside the camera module to deteriorate camera performance.

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

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

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

An embodiment is to provide a camera module that simplifies the manufacturing process and has improved reliability.

The embodiment includes a body having a through-hole formed in the center, and a housing including two or more supporting parts formed at corners of the body; a magnet portion having at least two or more magnets formed in a shape that can be disposed between opposite surfaces of each of the support portions; and a coil part disposed to correspond to the inner surface of the magnet part; provides a lens driving motor comprising a.

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

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

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

In addition, the support portion 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 edge in the optical axis direction may be formed with a curved surface portion formed to be spaced apart from the through hole by a predetermined distance.

In addition, each of the support portions may have a fixing groove formed at a lower side thereof, and the base may have fixing protrusions corresponding to the fixing grooves of the support portion.

In addition, at least two or more stoppers protruding from the upper surface of the body to absorb an external shock may be formed to be spaced apart from each other by a predetermined distance.

In addition, it may further include a lower spring including 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.

In addition, it may further include an upper spring including 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 part is seated may be formed on the 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 part, thereby simplifying the assembly process and improving 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 unit coupled to the housing according to the 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 specified, all terms herein 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 herein shall govern.

However, the invention to be described below is only for explaining the embodiments of the present invention and not for limiting the scope of the present invention, and the same reference numbers 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 that a magnet part is coupled to the housing according to an embodiment of the present invention it is one drawing

Referring to FIG. 1 , the lens driving motor according to the embodiment may largely include a cover can 100 , a housing 210 and a stator 200 including 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 disposed inside the housing 210 to move, and the mover 300 is supported by an upper spring 221 to be described later. can be

The cover can 100 accommodates a movable member 300 and a stator 200, which will 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 opened, but the shape of the cover can 100 may be formed in various ways. there is. In other words, the shape of the cover can 100 may be a quadrangular shape or an octagonal shape when viewed from the top, but is not limited thereto.

The inner surface of the cover can 100 may be closed by the base 240 in close contact with the side surface of the base 240 to be described later. It may have a material penetration prevention function.

In addition, the cover can 100 may also perform a function of protecting the components of the camera module from external 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 side of the lower end, and a fastening groove (not shown) into which the fastening piece is inserted in the base 240 . City) is formed on the side to realize a more robust sealing and fastening function of the camera module.

1 to 3 , the housing 210 may be formed in a shape corresponding to the inner surface of the cover can 100 , and may largely 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 in the center, and may be formed to correspond to the inner surface of the cover can 100, so that the housing 210 is attached to the cover can ( 100) can be fixed on the inside.

In addition, at least two stoppers 211b protruding from the upper surface of the body 211 and capable of absorbing an external shock may be formed to be spaced apart from each other by a predetermined distance. The stopper 211b may be integrally formed on the edge of the housing 210, may be formed on the bobbin 310 to be described later, but may not be formed.

In addition, a seating groove 211c in which the outer part 221a of the upper spring 221 to be described later is seated may be formed on the upper surface of the body 211 , and this seating groove 211c is formed in the body 211 . It may be formed in an arc shape at each of the corners of the upper side, but is not limited thereto.

The support part 212 may be formed on the outside or the 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 . to be able to be fixed. Specifically, the support part 212 may be disposed at each of the four corners of the body 211 to stably fix the body 211 inside the cover can 100 . In addition, the support parts 212 may be formed at equal intervals.

In addition, each of the support parts 212 may be formed in a rectangular shape, and the opposite surface or corner of the support part 212 is a curved part 212a formed to be 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, which will be described later, moves in the optical axis direction. Accordingly, as long as each of the support parts 212 does not interfere with the driving of the bobbin 310, it may be formed in any shape that does not include the curved part 212a. 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 on the lower side thereof to be coupled to the 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 the 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. may include

The magnet unit 230 may include at least two or more magnets formed in a shape that may be disposed between opposite surfaces of each of the support units 212 . Specifically, each of the four magnets constituting the magnet unit 230 has an outer surface capable of interviewing the inner surface of the cover can 100 , and formed so that both sides of each of the four magnets can be interviewed with the support portion 212 opposite to each other. can be

Here, in the magnet, a length of a surface in contact with the support may be the same as the length of the support, or a length of a surface in contact with the support may be shorter than a length of the support. That is, these magnets are disposed in the housing 210 in an exposed state, with only the upper surface and both sides facing the housing, and the lower surface being exposed. This structural shape allows the lower end of the housing to be substantially removed, thereby reducing the height of the lens driving motor. In addition, a separate adhesive material such as epoxy may be added to the surface in contact with the magnet and the support part 212 to be fixed by bonding.

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

One end of the upper spring 221 may be fixed by being seated 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, , may be provided to provide restoring force to the original position when the bobbin 310 moves upward. In addition, the other end is formed with a hole or groove corresponding to the protrusion formed on the upper surface of the bobbin 310, so that it can be fixed by heat sealing or bonding.

The upper spring 221 may be formed as a leaf spring, and includes an outer portion 221a that is seated and fixed in the seating groove 211c of the body 211 , and an inner portion that supports the upper surface of the bobbin 310 . It may include a 221b and a connection part 221c connecting the outer part 221a and the inner part 221b. The connection part 221c may be disposed from a portion of the upper surface of the body 211 to the inside of the through hole 211a, and may be bent more than once.

In addition, in addition to the upper spring 221, it may further include a lower spring 222. 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 connection 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 substantially 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 may be made in a substantially circular shape, and the outer periphery may be formed in a substantially rectangular shape so as to be supported by 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 a winding of the coil unit 320 to transmit a current applied from a substrate to be described later. In addition, when the spring functions as a terminal for transmitting a current applied from the substrate, the upper spring or the lower spring may include two separate springs. The two separate springs are electrically isolated from each other and spaced apart. In addition, the two separate springs may further include a bending portion bent toward the substrate for electrical connection with the substrate, which will be described later, and may be connected to the substrate through the bending portion. The bending part may protrude in a direction opposite to the bobbin with respect to the base 240 through a hole or groove formed in the base 240 .

The base 240 may be coupled to the housing 210 to close the open lower surface of the cover can 100 . The base 240 may have a fixing protrusion 241 corresponding to the fixing groove 212b of the support part 212 formed on the upper surface thereof, and the outer surface of each of these fixing projections 241 is the cover can 100 . may be interviewed on the inner surface of the , and other surfaces may be interviewed on the fixing groove 212b of the housing 210 . Alternatively, the fixing groove may be formed in the base and the fixing protrusion may be formed in the housing. In addition, the base may not be formed with a separate fixing protrusion, and may be coupled to the cover can by forming a groove portion on the periphery of a certain portion or the entire circumference of the base. The groove part serves to guide the coupling position with the cover can and prevents 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. This structural shape makes it possible to implement the assembly process of the lens driving motor more simply and at the same time to achieve a firm fixation after fastening.

In addition, the base 240 may include a recessed portion 242 recessed downwardly on the upper surface so that a bobbin 310 to be described later can 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 to which 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 contact or be spaced apart from each other at an initial position to which no current is applied, regardless of the presence or absence of the recess.

The base 240 may perform a sensor holder function to protect an image sensor (not shown) to be described later, and in this case, a protrusion may be formed in a downward direction along the side surface of the base 240 . In addition, the base 240 may include a filter seating groove for positioning a filter (not shown). The filter seating groove may be formed on an upper surface or a lower surface of the base, or may be formed on 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 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 may be disposed on a plate-shaped optical filter such as a cover glass for protecting an imaging surface or a cover glass.

In addition, when the filter is installed on the outside of the lens (not shown), it is possible to block infrared rays by coating the lens surface without separately configuring the filter.

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

The mover 300 may largely include a coil unit 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 forms a screw thread on the inner circumferential surface of the bobbin 310 and the outer circumferential surface of the lens unit, respectively. A bonding method may be used, but it may be combined by a threadless method using an adhesive. Of course, even in the screw thread coupling method, it is possible to achieve a more robust mounting between each other by using an adhesive after the screw thread fastening.

In addition, although not shown, a guide part for guiding the winding or mounting of the coil part 320, which will be described later, may be formed on the outer peripheral surface of the bobbin 310 . The guide portion may be integrally formed with the outer surface of the bobbin 310 , and may be formed continuously along the outer surface of the bobbin 310 or may be formed to be spaced apart from each other by a predetermined interval. In addition, a step (not shown) to which a pre-wound coil unit can be mounted may be formed on the outer peripheral surface of the bobbin, and the pre-wound coil may be fixed to the bobbin by being position-guided through the step.

In addition, although not shown, an upper spring 221 provided on an upper side and/or a 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 pillar shape, and may have a combined shape thereof.

The coil unit 320 may be guided by the guide unit to be wound on the outer surface of the bobbin 310 , and a pre-wound coil unit 320 may be mounted to the guide unit. 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 such a camera module is a mobile phone or a notebook personal computer, a camera phone, a PDA, a smart, a variety of multimedia fields such as toys (toy), and further monitoring It may be provided in an image input device such as an information terminal of a camera or a video tape recorder.

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

The lens unit (not shown) may be a lens barrel, but is not limited thereto, and any holder structure capable of supporting the lens may be included. 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 on the upper side of the base 240 and is disposed at a position corresponding to an image sensor to be described later. One or more lenses (not shown) may be provided in the lens unit.

The board (not shown) may be implemented as a printed circuit board (Printed Circuit Board), an image sensor (not shown) may be mounted on the center of the upper side, and various elements (not shown) for driving the camera module are provided. can be mounted.

In addition, the printed circuit board is to be electrically connected to the terminal part or the lower spring 222 or the upper spring 221 or directly 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, it is necessary to apply a current to the coil unit. For this purpose, a current may be applied directly to the coil unit from the substrate, and also through a separate terminal or indirectly through a spring. Current can also be applied to

The image sensor (not shown) may be mounted on the central portion of the upper side of the printed circuit board so as to be positioned along the 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 cured by moving it to an oven or by applying heat directly, and if UV (ultraviolet) epoxy is used, it is cured by applying UV (ultraviolet light) to the adhesive.

In addition, the adhesive may be an epoxy in which thermal curing and UV (ultraviolet ray) curing can be mixed, and both thermal curing and UV (ultraviolet ray) curing are possible, so it may be an epoxy that can be cured by selecting any one of them. The adhesive is not limited to the epoxy, and any material that can be adhered to may 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 with a simplified component shape compared to the prior art, the assembly process It is possible to implement a lens driving motor and a camera module with improved reliability due to the simplification of design, reduced assembly tolerance, lowered defective products, and enhanced durability.

Above, those skilled in the art from the above description will know that various changes and modifications are possible without departing from the technical spirit of the present invention. It should 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 portion 212a: curved portion
212b: fixing groove 221: upper spring
230: magnet unit 240: base
241: fixed projection 300: mover
310: bobbin 320: coil unit

Claims (14)

a cover including an upper plate including an opening and a side plate extending from the upper plate;
a housing disposed within the cover;
a bobbin disposed within the housing;
a coil disposed on the bobbin;
a magnet part disposed on 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 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 connecting portion connecting the inner portion and the outer portion,
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,
The magnet part is disposed between the plurality of support parts,
The magnet part includes an upper surface facing the lower surface of the housing, a lower surface disposed opposite to the upper surface, first and second sides connecting the upper surface and the lower surface and facing the plurality of support parts,
The housing surrounds the upper surface, the first side and the second side of the magnet part,
Each of the plurality of support portions of the housing includes a first portion disposed opposite to the surface facing the bobbin, a second portion connected to one side of the first portion, and a third portion connected to the other side of the first portion including a part,
The body of the housing includes a groove recessed from the upper surface of the body and disposed at the outer side of the upper elastic member, and a stopper protruding from the upper surface of the body,
The groove of the body is opened 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 body includes a second surface connecting the first surface of the groove and the upper surface of the body,
The second surface is a lens driving motor facing the side of the outer portion of the upper elastic member. According to claim 1,
The plurality of support parts include first to fourth support parts,
The magnet unit includes first to fourth magnets,
The first magnet is disposed between the first to second support parts, the second magnet is disposed between the second to third support parts, and the third magnet is disposed between the third to fourth support parts, and , wherein the fourth magnet is a lens driving motor disposed between the fourth to first support parts. According to claim 1,
The length in the optical axis direction of the magnet part is the same as the length in the corresponding direction of the plurality of support parts of the lens driving motor. According to claim 1,
The magnet part is a lens driving motor in contact with 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 groove and the stopper are respectively disposed in the first to fourth corner portions of the housing, wherein 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 lens driving motor. 7. The method of claim 6,
The upper surface of the body is disposed higher than the first surface of the groove of the body so that the groove and the stopper of the body form a two-step step difference on the upper surface of the body, and the upper surface of the stopper is the upper surface of the body A lens drive motor positioned higher than the image plane. 7. The method of claim 6,
At least a portion of the magnet portion overlaps the outer portion of the upper elastic member in an optical axis direction. According to claim 1,
The plurality of support parts include an inner peripheral surface facing the bobbin,
The inner circumferential surface of the plurality of support parts is a lens driving motor formed in a curved surface. 7. The method of claim 6,
The plurality of support portions include grooves recessed inward than edges of the first to fourth corner portions of the housing,
At least a portion of the stopper is overlapped with the plurality of support parts of the housing in an optical axis direction. 7. The method of claim 6,
The stopper is a lens driving motor disposed to contact the inner surface of the upper plate of the cover. image sensor;
The lens drive motor of claim 1;
A camera module including a lens coupled to the bobbin of the lens driving motor.

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