KR20230007300A - Motor for actuating lens - Google Patents

Abstract

An embodiment provides a lens driving motor, which comprises: a first operator disposed on a side surface of a lens unit to move the lens unit; a second operator located to face the first operator on a side surface of the first operator; a stator located to face a lower side of the second operator in order to move the second operator and formed with a through hole corresponding to the lens unit at the center thereof; and a base having a hollow hole supporting the stator and the second operator and corresponding to the through hole of the second operator formed at the center and including a mounting protrusion unit protruding from an upper side surface on which the through hole is formed to insert the through hole of the second operator so as to fix the second operator. The present invention can prevent an image sensor from being contaminated by foreign substances.

Description

Lens drive motor {MOTOR FOR ACTUATING LENS}

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

As the spread of various portable terminals is widely generalized and wireless Internet services are commercialized, consumers' demands related to portable terminals are also diversifying. Accordingly, various types of additional devices are being installed in portable terminals.

Among them, a lens driving motor is a typical example that can take a picture or video of a subject, store the image data, and then edit and transmit the image data as needed.

Recently, the demand for small lens drive motors for various multimedia fields such as notebook personal computers, camera phones, PDAs, smart devices, and toys, and image input devices such as information terminals for surveillance cameras and video tape recorders is increasing. there is.

Conventional lens driving motors can be roughly classified into a fixed focus (F.F) type, an auto focus (A.F) type, and an optical image stabilization (OIS) type lens driving motor.

Here, the lens drive motors are constantly being developed to protect components inside the cover can from foreign substances that are commonly penetrated or generated. In particular, in the case of the OIS type, FPCB However, there may be a problem of infiltrating the image sensor or the like by foreign matter generated when processing into a shape suitable for the inside of the lens driving motor or generated later.

Such foreign matter may cause a problem because the quality and performance of the lens driving motor are deteriorated as a result.

In addition, the fixing of the FPCB and the coil unit mounted on the base may lift the base from the base after a lapse of time, and thus the reliability of the lens driving motor may deteriorate.

(Patent Document 1) JP 2013-024938 A

Embodiments provide a lens driving motor in which reliability is improved by preventing an image sensor or the like from being contaminated by foreign substances and firmly implementing fastening to a base of a stator.

The embodiment includes a first mover disposed on a side surface of the lens unit to move the lens unit, a second mover disposed opposite to the first mover on a side surface of the first mover, and moving the second mover. A stator located opposite the lower side of the second mover and having a through hole corresponding to the lens unit formed in the center, and a hollow hole supporting the stator and the second mover and corresponding to the through hole of the second mover Provided is a lens driving motor including a base formed at the center and including a seating protrusion protruding from an upper surface where the hollow hole is formed so that the through hole of the second mover is inserted and the second mover is fixed.

In addition, the seating protrusion may be integrally formed with the base.

In addition, the seating protrusion may protrude in the shape of a circular rim.

In addition, the seating protrusion may be formed by protruding at least two or more protrusions at equal intervals.

In addition, the first mover includes a bobbin for fixing the lens unit and a first coil unit provided on an outer circumferential surface of the bobbin, and the second mover includes a magnet unit disposed to face the first coil unit and a magnet unit disposed to face the first coil unit. A fixed housing may be included, and the stator may include a second coil part positioned opposite to a lower side of the magnet part and an FPCB that fastens the second coil part to an upper surface to apply power.

In addition, at least two or more bonding grooves may be formed on an upper surface of the base in an outer direction of the seating protrusion, and the stator may have a concave groove formed at a position corresponding to the bonding groove.

In addition, the concave groove may be formed to have a larger diameter than the diameter of the bonding groove.

Also, the second coil unit may be an FP coil.

In addition, an elastic unit for providing a return force to the first mover and the second mover may be further included.

The elastic unit may include a lower spring fastened to lower surfaces of the bobbin and the housing, an upper spring coupled to upper surfaces of the bobbin and the housing, and a side spring coupled to side surfaces of the bobbin.

Also, the elastic unit may be a plate spring.

In addition, a hall sensor unit mounted on a lower surface of the FPCB may be further included to correspond to the position of the magnet unit.

In addition, a cover can accommodating the first mover, the stator, and the second mover and being mounted on the base forms the outer appearance of the lens driving motor.

In addition, the cover can may have at least one extending fastening piece formed on each surface of the lower end, and a fastening groove into which the fastening piece is inserted may be formed in the base.

In addition, the base may further include a printed circuit board mounted on an upper surface and having an image sensor for converting an optical signal incident from the lens unit into an electrical signal mounted at the center thereof.

According to an embodiment of the present invention, a lens driving motor with improved reliability is implemented by providing a seating protrusion to prevent foreign matter generated from internal components of the lens driving motor from penetrating into the image sensor.

1 is a combined perspective view of a lens driving motor according to an embodiment of the present invention.
2 is an exploded perspective view of a lens driving motor according to an embodiment of the present invention;
3 is a perspective view of a combination of a base and a stator according to an embodiment of the present invention;
4 is a perspective view of a base 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 'hollow hole 510' may be referred to as a 'hole', the 'seating protrusion 550' may be referred to as a 'protrusion', and the hall sensor accommodating groove 540 may be referred to as a 'groove 540'.

Hereinafter, the lens driving motor of the embodiment will be described in detail with reference to the drawings.

1 is a combined perspective view of a lens driving motor according to an embodiment of the present invention, Figure 2 is an exploded perspective view of a lens driving motor according to an embodiment of the present invention, Figure 3 is a base and a stator according to an embodiment of the present invention It is a combined perspective view, and Figure 4 is a perspective view of the base according to an embodiment of the present invention.

1 to 4, the lens driving motor according to the embodiment largely includes a cover can 100, a first mover 200, a second mover 300, a stator 400, a base 500 and An elastic unit 700 may be included. In addition, although not shown, the lens driving motor may further include a printed circuit board, an IR filter, an image sensor, and the like.

The cover can 100 accommodates the elastic unit 700, the first mover 200, the stator 400, and the second mover 300, which will be described later, and is mounted on the base 500, so that the lens driving motor has an appearance. form Specifically, the inner surface of the cover can 100 is mounted on the base 500 in close contact with a part or all of the side surface of the base 500 to be described later, and protects internal components from external impact and at the same time external contamination. It has a material penetration prevention function.

In addition, the cover can 100 should also perform a function of protecting components of a lens driving motor or a camera module from external radio wave interference generated by a mobile phone or the like. Therefore, the cover can 100 is preferably formed of a metal material.

The cover can 100 may be implemented as a yoke part itself, which will be described later, or may be molded and fixed to the inside of the yoke part. In the embodiment, the upper surface of the cover can 100 is formed with an opening 110 through which a lens unit (not shown) is exposed, and the lower part of the upper surface of the cover can 100 is bent toward the inside of the cover can 100. A formed inner yoke (not shown) may be formed. This inner yoke may be located in a concave portion 213 formed in the bobbin 210 to be described later. In this case, the inner yoke may be disposed at a corner around the upper side opening of the yoke unit or disposed at a side surface, and the concave portion of the bobbin may be formed at a corresponding position.

In addition, the cover can 100 may have at least one extended fastening piece 120 formed on each surface of the lower end, and a fastening groove 520 into which the fastening piece 120 is inserted into the base 500 to be described later. ) is formed to implement a more robust sealing function and fastening function of the lens driving motor. In addition, the fastening piece and the fastening groove may not be separately formed, and only one of the two may be formed.

Meanwhile, the first mover 200 is disposed on the side of the lens unit to move the lens unit (not shown). The first mover 200 includes a bobbin 210 for fixing the lens unit and a first coil unit 220 provided on an outer circumferential surface of the bobbin 210 .

The lens unit (not shown) may be a lens barrel having one or more lenses (not shown), but is not limited thereto, and may include any holder structure capable of supporting lenses.

An inner circumferential surface of the bobbin 210 is coupled to an outer circumferential surface of the lens unit to fix the lens unit. In addition, the bobbin 210 may have a guide part 211 formed on an outer circumferential surface of the bobbin 210 to guide winding or mounting of the first coil part 220 to be described later. The guide part 211 may be integrally formed with the outer surface of the bobbin 210, and may be continuously formed along the outer surface of the bobbin 210 or may be formed spaced apart at predetermined intervals.

In addition, on the upper and lower surfaces of the bobbin 210, a spring to which an upper spring 710 or a lower spring 720 provided so that the bobbin 210 can be supported on the upper side of the base 500, which will be described later, is fastened. A fastening protrusion 212 may be formed.

In addition, the bobbin 210 has a yoke formed on an outer circumferential surface of the bobbin 210 so that the inner yoke of the cover can 100, which will be described later, can be positioned between the bobbin 210 and the first coil part 220 wound on the bobbin 210. A mouth 213 may be further included.

In addition, the first coil part 220 may be guided by the guide part 211 and wound on the outer surface of the bobbin 210, but four individual coils are 90° to the outer surface of the bobbin 210. They may be arranged at intervals. The first coil unit 220 may receive power applied from a printed circuit board (not shown) to be described later and form an electromagnetic field.

Meanwhile, the second mover 300 is located on the side of the first mover 200 to face the first mover 200, and is a magnet disposed to face the first coil part 220. It may include a part 310 and a housing 320 to which the magnet part 310 is fixed.

Specifically, the magnet part 310 is attached to the housing 320 with an adhesive so that it can be disposed at a position corresponding to the outer surface of the first coil part 220, and inside the housing 320, 4 It is mounted on the corners of the dog at equal intervals to promote efficient use of the internal volume.

The housing 320 may be formed in a shape corresponding to the inner surface of the cover can 100 forming the exterior of the lens driving motor. In addition, the housing 320 is formed of an insulating material and may be formed as an injection molding product in consideration of productivity. can

In the embodiment, the housing 320 is formed in a hexahedral shape by being spaced a certain distance from each other corresponding to the shape of the cover can 100, and the upper and lower sides are open to support the first mover 200. In addition, the housing 320 may include a magnet part fastening hole 311 or a magnet part fastening groove formed in a shape corresponding to the magnet part 310 on a side surface.

In addition, at least two stoppers 312 protruding at a predetermined distance from the upper surface of the housing 320 may be formed to absorb impact by coming into contact with the upper surface of the cover can 100 when an external impact occurs. . The stopper 312 may be integrally formed with the housing 320 .

In addition, on the upper and lower surfaces of the housing 320, an upper spring 710 or a lower spring 720 provided to support the housing 320 on the upper side of a base 500, which will be described later, is fastened. A fastening protrusion 313 may be formed.

Meanwhile, the stator 400 is positioned opposite to the lower side of the second mover 300 to move the second mover 300, and the through holes 411 and 421 corresponding to the lens unit are formed in the center

Specifically, the stator 400 includes a second coil unit 410 positioned opposite to the lower side of the magnet unit 310 and a substrate to which power is applied by disposing the second coil unit 410 on the upper side. Including, the substrate includes a flexible printed circuit board (FPCB, 420).

The second coil unit 410 may be mounted on an FPCB 420 provided on the upper side of a base 500 to be described later or formed on an FPCB or a substrate, and to pass an optical signal of the lens unit (not shown) A through hole 411 is formed in the center. On the other hand, considering the miniaturization of the lens driving motor, specifically, the reduction of the height in the z-axis direction, which is the optical axis direction, the second coil unit 410 is formed of a patterned coil FP coil to form the FPCB can be placed on top.

The FPCB 420 may be provided on the upper side of the base 500 to apply power to the second coil part 410, and corresponds to the through hole 411 of the second coil part 410. A through hole 421 is formed. In addition, the FPCB 420 includes a terminal portion 422 that protrudes downward from the base 500 with one end or both opposite ends bent, and external power can be supplied through the terminal portion 422 .

In addition, the embodiment may further include a hall sensor unit (not shown) mounted on the lower or upper side of the FPCB 420 to correspond to the position of the magnet unit 310 .

The hall sensor unit senses the strength and phase of the voltage applied to detect the movement of the magnet unit 310 and the current flowing through the coil, and is provided to precisely control the actuator by interacting with the FPCB 420 .

Since the hall sensor unit may be provided on a straight line with respect to the magnet unit 310 and the direction of the optical axis, and should detect the displacement of the x-axis and the y-axis, the hall sensor unit may be located at two adjacent corners of the FPCB 420. It includes two Hall sensors each provided at the corner, and a Hall sensor accommodating groove 540 capable of accommodating the Hall sensors may be formed in the base 500 . In addition, one or more Hall sensors may be provided.

Although the Hall sensor unit is provided adjacent to the second coil unit 410 rather than the magnet unit 310, considering that the strength of the magnetic field formed in the magnet unit is several hundred times greater than the strength of the electromagnetic field formed in the coil, the magnet unit The influence of the second coil unit 410 is not taken into account in sensing the movement of 310 .

The independent or organic interaction of the first mover 200, the second mover 200, and the stator 400 moves the lens unit in all directions so that the first mover 200 and/or the second mover 300 ), the image focus of the subject is focused, and hand shake can be corrected through the interaction of the first mover 200 and/or the second mover 300.

Meanwhile, the base 500 supports the stator 400 and the second mover 300, and a hollow hole 510 corresponding to the through holes 411 and 421 is formed in the center.

This base 500 may perform a sensor holder function to protect an image sensor (not shown) to be described later and may be provided to position an IR filter (not shown).

In this case, the IR filter may be mounted in the hollow hole 510 formed in the center of the base 500, and an infrared ray 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 to the base, a separate sensor holder may be additionally located under the base.

In addition, the base 500 may be formed with one or more fixing protrusions 530 that protrude from the upper edge and face or combine with the inner surface of the cover can 100, and these fixing protrusions 530 are formed on the cover. It guides the fastening of the can 100 easily and at the same time makes it possible to secure it firmly after fastening.

In addition, the base 500 may be formed with a fastening groove 520 into which the fastening piece 120 of the cover can 100 is inserted. The fastening groove 520 is formed locally on the outer surface of the base 500 in a shape corresponding to the length of the fastening piece 120, or is formed at a predetermined level at the bottom of the cover can 100 including the fastening piece 120. It may be entirely formed on the outer surface of the base 500 so that the part can be inserted.

Here, foreign substances may enter through the through holes 411 and 421 and the hollow hole 510 of the stator 400 and the base 500, and these foreign substances may enter various elements mounted on the printed circuit board provided on the lower side. , the image sensor may be contaminated, and the performance of the lens driving motor may be deteriorated. In particular, when the OIS (Optical Image Stabilization) function is provided, an FP coil and/or an FPCB 420 are used. Through-holes 411 and 421 are formed in the center, and the shape according to other lens driving motors is processed In this process, many foreign substances are generated, and even if cleaning is performed after processing, foreign substances may remain, which may cause problems.

Therefore, the embodiment of the present invention includes a seating protrusion 550 protruding from the upper side of the base 500 in which the hollow hole 510 is formed.

Specifically, the seating protrusion 550 is inserted into the through holes 411 and 421 of the stator 400 and is formed to surround inner circumferential surfaces of the through holes 411 and 421 of the stator 400 . The seating protrusion 550 may have a diameter equal to or smaller than that of the inner circumferential surface of the through holes 411 and 421 of the stator 400 .

In addition, the seating protrusion 550 may be integrally formed with the base 500, and as shown, may be formed by protruding in the shape of a circular rim, or at least two or more protrusions protrude at regular intervals or at predetermined intervals can be formed.

In addition, in order to prevent the occurrence of foreign matter from the stator 400 and firmly mount the stator 400, the embodiment may further include the following features.

At least two or more bonding grooves 560 are formed on the upper surface of the base 500 in an outer direction of the seating protrusion 550, and the stator 400 is positioned at a position corresponding to the bonding grooves 560. Concave grooves 413 and 423 formed may be formed.

That is, the concave grooves 413 and 423 are formed to correspond to the second coil unit 410 and the FPCB 420, respectively, and are arranged outside the respective through holes 411 and 421 to form small circular holes. can be formed as

Referring to FIG. 3 , when the stator 400 is mounted on the base 500 and the adhesive is injected into the concave grooves 413 and 423, the adhesive introduced into the concave grooves 413 and 423 is seated in the grooves 413 and 423. It enters between the outer circumferential surface of the protrusion 550 and the inner circumferential surface of the through-holes 411 and 421 of the stator 400 to suppress further generation of foreign matter and to secure the mounting of the stator 400, and the adhesive is applied to the lower side of the stator 400. It is introduced into the adhesive groove 560 formed in the base 500 to enable more robust mounting. That is, the base 500 may include an adhesive accommodating portion in which an adhesive for fixing the FPCB 420 to the base 500 is accommodated. At this time, the adhesive receiving portion may be an adhesive groove 560 formed on the upper surface of the base 500 .

In addition, a dust trap may be formed on the upper surface of the base at a periphery of the through hole 510, which may be formed of epoxy or the like. It may be formed around a circle having a larger diameter than the through hole, and may be formed in various shapes such as a square shape. The seating protrusion and the dust trap may be formed together, or only one of the two may be formed.

Meanwhile, the embodiment further includes an elastic unit 700 for providing a return force to the first movable element 200 and the second movable element 300, and this elastic unit 700 improves production efficiency and For miniaturization of the lens driving motor, it is preferable that a single plate member is formed of a plate spring that is bent and cut as shown.

The elastic unit 700 includes a lower spring 720 fastened to the lower surfaces of the bobbin 210 and the housing 320, and an upper spring 710 fastened to the upper surfaces of the bobbin 210 and the housing 320. ) and a side spring 730 fastened to a side surface of the bobbin 210.

Two of the side springs 730 receive power from a printed circuit board (not shown), which will be described later, and transfer the power to the upper spring 710, and the upper spring 710 returns the delivered power to the first coil unit. 220, the two side springs 730, the upper spring 710, and the first coil unit 220 may be electrically connected. At this time, the upper spring may also be composed of two, so that each can function as two terminals.

In short, the upper, lower, and side springs 710, 720, and 730 may be formed of a first fastening part, a second fastening part, and a connecting part connecting the first fastening part and the second fastening part, respectively, and the connecting part At least two or more bending parts may be implemented to connect the first fastening part and the second fastening part. Here, the first fastening part may be a part coupled to the housing, and the second fastening part may be a part connected to the bobbin, and vice versa.

In addition, the lens driving motor according to an embodiment of the present invention may further include a printed circuit board (not shown), and the printed circuit board may be mounted below the base 500 . An image sensor (not shown) is mounted on the central portion of the upper side of the printed circuit board, and various elements (not shown) for driving a lens driving motor may be mounted. In addition, the printed circuit board may be electrically connected to the side spring 730 described above to apply power for driving the first mover 200 described above.

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.

On the other hand, the adhesive disclosed in the present invention 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.

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: first mover
210: bobbin 220: first coil unit
300: second mover 310: magnet part
320: housing 400: stator
500: base 550: seating protrusion
560: adhesive groove 700: elastic unit
710: upper spring 720: lower spring
730: side spring

Claims (1)

Base;
a housing disposed on the base;
a bobbin including a hole formed in an optical axis direction and disposed within the housing;
a substrate disposed on the base;
a magnet disposed in the housing;
a first coil disposed on the bobbin;
a second coil unit disposed on the substrate and including a second coil; and
An adhesive for fixing the substrate to the base,
The substrate includes a hole formed at a position corresponding to the hole of the bobbin, and an open area formed on an inner circumferential surface of the hole of the substrate.

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