KR102105697B1 - Motor for actuating lens - Google Patents

Abstract

An embodiment includes a mover fixing the lens unit, a stator moving the mover, and a magnetic unit provided between the mover and the stator, wherein the magnetic unit includes a magnetic body provided on one side of the bobbin, It may include a metal plate provided in the housing to contact the magnetic body

Description

Lens driving motor {MOTOR FOR ACTUATING LENS}

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

2. Description of the Related Art As the spread of various mobile terminals is widely generalized and wireless Internet services are commercialized, the demands of consumers related to the mobile terminals are also diversified. Accordingly, various types of additional devices are mounted on the mobile terminals.

Among them, a camera module is one that can photograph a subject as a photo or video, store the image data, and edit and transmit it as needed.

2. Description of the Related Art In recent years, demand for a small camera module has been increasing for a variety of multimedia fields such as notebook personal computers, camera phones, PDAs, smarts, and toys, and also for image input devices such as surveillance cameras or video tape recorder information terminals. .

Conventional lens driving motors include an elastic unit such as a coil spring or a leaf spring to provide a return force to the bobbin.

However, the elastic unit occupies a space inside the lens driving motor, thereby reducing the efficiency of component arrangement, and may cause limitations in miniaturization of the lens driving motor.

In addition, in the case of an elastic unit implemented as a plate spring, since the plate spring in the form of a thin plate is easily deformed, the manufacturing cost is high, and deterioration may occur due to deformation caused when assembling the lens driving motor or using the lens driving motor. .

In addition, there is a difficulty in designing the plate spring in consideration of the elastic modulus according to the weight deformation of the mover.

The embodiment provides a lens driving motor capable of miniaturization, improving tilting control performance, simplifying a product assembly process, and improving cost, and rapidly adjusting focus.

An embodiment provides a lens driving motor including a mover fixing a lens unit, a stator moving the mover, and a magnetic unit provided between the mover and the stator.

In addition, the mover may include a bobbin fixing the lens unit, and a magnet unit provided outside the bobbin.

In addition, the stator may include a coil part disposed to face the magnet part, and a housing supporting the coil part.

In addition, the stator may further include a base supporting the housing and the mover.

In addition, it may further include a cover can that is mounted to the base to accommodate the mover and the stator.

In addition, the cover can may be formed of a metal material.

In addition, the cover can has a fastening piece formed on the lower side, and the base may have a fastening groove or fastening hole into which the fastening piece is inserted.

In addition, the magnetic unit may include a magnetic body provided on one side of the bobbin, and a metal plate provided on the housing to contact the magnetic body.

In addition, a magnetic body receiving groove in which the magnetic body is mounted may be formed on an outer surface of the bobbin.

In addition, the magnetic body may be provided with at least two or more may be disposed at equal intervals on the outer surface of the bobbin.

In addition, the magnetic body may be formed in a cylindrical shape.

In addition, the magnetic body may be provided on the bobbin so that the longitudinal direction of the magnetic body and the optical axis direction of the lens unit coincide.

In addition, a plate receiving groove in which the metal plate is mounted may be formed on the inner surface of the housing.

In addition, the metal plate may be formed of an iron plate.

In addition, the magnet portion is formed of two magnets opposed to each other, the coil portion is formed of two coil portions, the magnetic body is provided between the two magnets, and the metal plate can be provided between the two coil portions. have.

In addition, it may further include a hall sensor portion disposed to correspond to the magnet portion.

In addition, the hall sensor unit may be provided on the inner surface of the housing.

In addition, the stator further includes a base supporting the housing and the mover, and the hall sensor unit may be provided on the base.

In addition, the base may be formed with a hall sensor receiving groove in which the hall sensor is seated.

In addition, the hall sensor unit may include a hall sensor disposed to correspond to the auxiliary magnet and a power unit electrically connected to the hall sensor to receive power from the outside.

According to an embodiment of the present invention, including a magnetic unit, miniaturization, tilting control performance improvement, product assembly process simplification and cost improvement, and provided with a Hall sensor unit to provide a lens driving motor capable of rapid focus adjustment.

1 is a schematic top view of a lens driving motor according to an embodiment of the present invention.
FIG. 2 is a cross-sectional side view of the lens driving motor shown in FIG. 1 taken along line A-A '.
3 is an exploded perspective view of a lens driving motor 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 specified, all terms in this specification are the same as the general meaning of terms understood by those skilled in the art, and if the terms used in this specification conflict with the general meanings of the terms, the definitions used in the present specification follow.

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

1 is a schematic top view of a lens driving motor according to an embodiment of the present invention, and FIG. 2 is a side cross-sectional view taken along line A-A 'in the lens driving motor shown in FIG. 1, and FIG. It is an exploded perspective view of a lens driving motor according to an embodiment of the invention.

1 to 3, the lens driving motor according to the embodiment may include a mover 100 for fixing the lens unit (not shown) and a stator 200 for moving the mover 100. You can.

Here, the mover 100 may include a bobbin 110 for fixing the lens unit, and a magnet unit 120 provided outside the bobbin 110.

Specifically, the bobbin 110 is coupled to the lens portion to fix the lens portion, the coupling method of the lens portion and the bobbin 110, as shown in the thread 111, the inner peripheral surface of the bobbin 110 and the lens portion It is also possible to use a thread-coupling method that is formed on the outer circumferential surface, respectively, but it can also be combined as a screw-free method using an adhesive. Of course, even in the thread coupling method, after the thread is fastened, an adhesive may be used to promote a more robust mounting between the bobbin 110 and the lens unit.

In addition, although the bobbin 110 is shown in an octagonal column shape, it may be implemented in various shapes. The outer circumferential surface of the bobbin 110 may be formed with a magnet receiving groove 112 recessed in a shape corresponding to the magnet of the magnet unit 120 so that the magnet unit 120 to be described later can be mounted. The magnet receiving groove 112 may be continuously formed along the outer surface of the bobbin 110 or spaced apart at a predetermined interval.

In addition, a magnetic body accommodating groove 113 in which a magnetic body 510 to be described later is mounted may be formed on the outer surface of the bobbin 110. The magnetic body receiving groove 113 may be concave and formed in a shape corresponding to the magnetic body 510, and may be formed between the magnet receiving groove 112.

Meanwhile, 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. The embodiment describes, for example, the case where the lens portion is a lens barrel. The lens unit is installed on an upper side of a printed circuit board (not shown), which will be described later, and is disposed at a position corresponding to an image sensor. The lens unit is provided with one or more lenses (not shown).

The magnet unit 120 may be mounted on the bobbin 110 so as to be disposed on the outer surface of the bobbin 110, or may be inserted into the magnet receiving groove 112 as shown, or the magnet receiving groove It can be mounted on the 112 as an adhesive or the like. The magnet unit 120 is illustrated as two opposing magnets, but four magnets may be mounted at equal intervals on the outer surface of the bobbin 110.

Each of the magnets constituting the magnet unit 120 may be formed in a rectangular plate shape as illustrated, but unlike this, a triangular prism shape with an inner surface forming a curved surface according to structural changes of the bobbin 110, It may be formed in each column shape, such as a square column shape or a trapezoidal column shape.

Meanwhile, the stator 200 may include a coil part 210 disposed opposite the magnet part 120 and a housing 220 supporting the coil part 210, and the housing 220. And it may further include a base 230 for supporting the mover 100.

The coil part 210 is formed and illustrated as two coiled coil parts 210, but may be provided to correspond to the magnet part 120 as described above. That is, if the magnet unit 120 is formed of four magnets, four individual coils may be arranged toward the magnet unit 120. The coil unit 210 may receive an electric power applied from a printed circuit board, which will be described later, to form an electromagnetic field.

The housing 220 may be formed in a shape corresponding to the inner surface of the cover can 300 to be described later. In an embodiment, the housing 220 may be formed and disposed in a hexahedral shape corresponding to the shape of the cover can 300, and the upper and lower sides may be opened to support the mover 100.

In addition, the housing 220 may include a coil part fastening hole 221 or a coil part fastening groove formed in a shape corresponding to the coil part 210 on a side surface, and an inner surface of the housing 220 may be provided. A plate receiving groove 222 in which the metal plate 520 is mounted may be formed. The coil part 210 or the metal plate 520 may be more firmly mounted on the housing 220 with an adhesive or the like.

Further, at least two or more stoppers 223 formed at equal intervals on the upper surface of the housing 220 are formed to interview the upper surface of the cover can 300 against external impact to absorb shock and absorb the lens unit. Can protect.

In addition, the housing 220 is formed of an insulating material, and may be made as an injection material in consideration of productivity, and the housing 220 is a moving part for auto focusing (AF) driving, and a certain distance from the cover can 300. It can be spaced apart.

The base 230 is disposed under the lens driving motor to support the housing 220 and the mover 100.

Specifically, the base 230 supports the stator 200 and the mover 100, and the recess portion 231 recessed downward in a circular shape in the center so that the bobbin 110 can be spaced apart from each other. ) Is formed, a hole sensor receiving groove 232 in which a hall sensor unit to be described later is seated may be formed on a side of the recess 231, and a through hole corresponding to an image sensor (not shown) to be described later in the center. 233 is formed.

The base 230 may function as a sensor holder to protect the image sensor, and the through hole 233 may be provided to position a filter (not shown).

In this case, the filter may be provided with an infrared filter (Infrared Ray Filter). In addition, the filter may be formed of, for example, a film material or a glass material, and an infrared ray blocking coating material or the like 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, a separate sensor holder may be located below the base 230 in addition to the base 230.

In addition, the base 230 may protrude at the upper edge and may be formed with one or more fixing protrusions 234 that interview or engage the inner surface of the housing 220, and such fixing protrusions 234 may include the housing ( 220) It is possible to easily guide the fastening, and at the same time, to secure a firm fixation after fastening.

In addition, although not shown, the base 230 may be formed with a fastening groove (not shown) into which the fastening piece 310 of the cover can 300 to be described later is inserted. These fastening grooves are formed locally on the outer surface of the base 230 in a shape corresponding to the length of the fastening piece 310, or a predetermined portion of the bottom of the cover can 300 including the fastening piece 310 is inserted. It can be formed as a whole on the outer surface of the base 230 to be.

In addition, the side portion of the base 230 may be formed with a recessed terminal groove 235 corresponding to the shape of the terminal portions 411 and 421 to be described later.

Meanwhile, the embodiment may further include a cover can 300 that is mounted to the base 230 by accommodating the mover 100 and the stator 200.

The cover can 300 forms an external appearance of the lens driving motor, an opening formed to open the lens unit on an upper surface, and a lower surface may be formed as an open surface.

Specifically, the cover can 300 is mounted on the base 230, the inner surface of which is in close contact with the side portion of the base 230 to be described later, and protects internal components from external impact while preventing external pollutant penetration. It has a function.

In addition, the cover can 300 should also perform a function of protecting the components of the camera module from external radio interference generated by a mobile phone or the like. Therefore, the cover can 300 may be formed of a metal material.

In addition, the cover can 300 is formed with at least one fastening piece 310 formed on at least one surface of each lower end, and the base 230 has a fastening groove into which the fastening piece 310 into which the fastening piece 310 is inserted is inserted ( Or not shown) or a fastening hole may be formed to implement a more robust sealing function and fastening function of the camera module.

The embodiment may further include a terminal 400 electrically connected to the coil unit 210 so as to supply power to the coil unit 210 from a printed circuit board to be described later. The terminal 400 may be disposed on the upper surface of the base 230 and may be connected in a soldering manner to be electrically connected to the coil part 210. The terminal 400 may be formed of two metal materials 410 and 420 in a symmetric shape, and one end of each terminal 400 is bent to form a terminal groove 235 formed on the side of the base 230. It may include a terminal portion (411, 421) disposed in each.

Here, the embodiment includes a magnetic unit 500 provided between the mover 100 and the stator 200. Specifically, the magnetic unit 500 includes a magnetic body 510 provided on one side of the bobbin 110 and a metal plate 520 provided on the housing 220 to contact the magnetic body 510. can do.

Since the magnetic body 510 and the metal plate 520 can hold the bobbin 110 at a specific location in a spaced apart space between the bobbin 110 and the housing 220 as mutual attraction, the bobbin at a specific location ( The power of the additional lens driving motor applied so that 110) can be continuously positioned is unnecessary, and the anti-vibration function of the bobbin 110 is improved. In addition, since the existing elastic unit is unnecessary, efficient use of the internal space of the lens driving motor can be promoted, so that the overall size of the lens driving motor can be reduced.

The magnetic body 510 may be formed of a magnet, and at least two or more may be provided to be disposed at equal intervals on the outer surface of the bobbin 110, and provided between the magnet parts 120 as shown. To be able to be mounted on the magnetic body receiving groove 113 as an adhesive or the like, it is possible to implement the holding function of the stable bobbin 110.

In addition, the magnetic body 510 may be formed in various shapes, but since it is effective in terms of the electric power of the lens driving motor to contact the metal plate 520 with a minimum area, it is formed into a spherical shape or a cylindrical shape as illustrated. Can be. In the latter case, the magnetic body 510 may be provided on the bobbin 110 so that the longitudinal direction of the magnetic body 510 and the optical axis direction of the lens portion coincide so that the lens unit is easily moved in the optical axis direction.

The metal plate 520 may be formed of a metal material that reacts with the magnetic body 510, for example, may be formed of an iron plate. Of course, the magnetic body 510 may be formed in a plate shape, and the metal plate 520 may be formed in a cylindrical shape or the like so that an area in contact with the magnetic body 510 can be minimized.

The metal plate 520 may be provided between the two coil parts 210 as shown, and firmly mounted as an adhesive or the like in the plate receiving groove 220 formed in the housing 220 as described above. You can.

On the other hand, the embodiment further includes a Hall sensor unit (not shown) disposed corresponding to the magnet unit 120 to detect and feedback the position information of the mover 100 to implement faster and more accurate lens driving. have.

Specifically, the hall sensor unit is provided to precisely control the mover 100 by detecting the movement of the magnet unit 120, the hall sensor unit may be provided with one or more.

Since the hall sensor unit needs only to correspond to the magnet unit 120, it may be provided on the inner surface of the housing 220 or may be provided on the base 230. In the latter case, as described above, the hall sensor receiving groove 232 is formed in the base 230 to facilitate efficient space allocation of the hall sensor unit. In the former case, considering that the Hall sensor part is adjacent to the coil part 210, but considering that the strength of the magnetic field formed in the magnet is several hundred times greater than that of the electromagnetic field formed in the coil part 210, the magnet part ( The influence of the coil part 210 in detecting the movement of 120 is not considered.

The hall sensor unit may include a hall sensor disposed to correspond to the magnet unit 120 and a power unit electrically connected to the hall sensor to receive power from the outside. The power supply unit may receive external power from a printed circuit board (not shown), which will be described later. When the power supply unit is disposed on the upper surface of the base 230, the power supply unit is a separate FPCB (Flexible Printed Circuit Board) on the base 230. , Not shown) to receive power.

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, camera phone, PDA, smart, toy (toy), various multimedia fields, and further surveillance It may be provided in an image input device such as an information terminal of a camera or video tape recorder.

In short, 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 printed circuit board (not shown) and an image sensor (not shown).

The image sensor may be mounted in the center of the upper side of the printed circuit board, and various elements (not shown) for driving the camera module may be mounted. Further, the printed circuit board is electrically connected to the terminal portions 411 and 421 of the terminal 400 or directly to the coil portion 210 to apply power to drive the lens driving motor according to the embodiment. .

The image sensor (not shown) may be mounted on the center of the upper surface of the printed circuit board so that it can be positioned along the optical axis direction with one or more lenses (not shown) accommodated in the lens unit. The image sensor converts the optical signal of the object incident through the lens into an electrical signal.

The adhesives described above can be embodied with a thermosetting epoxy or UV epoxy, and are cured by exposure to heat or UV. However, when a thermosetting epoxy is used, it is a method of curing by moving to an oven or by directly applying heat, and when using UV (ultraviolet) epoxy, it is a method of curing by applying UV (ultraviolet) to the adhesive.

In addition, the adhesive may be an epoxy in which heat curing and UV (ultraviolet) curing can be mixed, and may be both heat curing and UV (ultraviolet) curing, and may be an epoxy that can be cured by selecting one of them. The adhesive is not limited to the epoxy, and any material that can be adhered can be substituted.

As described above, those skilled in the art from the above description will be able to see that various changes and modifications can be made without departing from the technical spirit of the present invention. It should be determined by the scope and its equivalent.

100: mover 110: bobbin
112: magnet receiving groove 113: magnetic body receiving groove
120: magnet part 200: stator
210: coil portion 220: housing
221: coil fastening hole 222: plate receiving groove
230: base 231: recess
232: Hall sensor receiving groove 300: Cover can
400: terminal 500: magnetic unit
510: magnetic material 520: metal plate

Claims (20)

housing;
A bobbin disposed in the housing;
A magnet part disposed on the bobbin;
A coil portion disposed on the housing and facing the magnet portion;
A magnetic body disposed on the bobbin; And
A metal plate disposed on the housing and facing the magnetic body,
The magnetic body and the metal plate is a lens driving motor that is not disposed on a virtual straight line connecting the magnet portion and the coil portion.
According to claim 1,
The bobbin includes first to fourth outer surfaces formed on the outer surface, and fifth to eighth outer surfaces connecting the first to fourth outer surfaces, respectively.
The magnet portion is disposed on at least one of the first to fourth outer surfaces,
The magnetic body is a lens driving motor disposed on at least one of the fifth to eighth outer surfaces.
According to claim 2,
The area of the fifth to eighth outer surfaces is smaller than that of the first to fourth outer surfaces.
According to claim 2,
Each of the fifth to eighth outer surfaces forms a predetermined angle with the first to fourth outer surfaces.
According to claim 2,
The magnet driving motor includes a first magnet disposed on the first outer surface of the bobbin, and a second magnet disposed on the third outer surface facing the first outer surface of the bobbin.
The method of claim 5,
The magnetic body includes a first to fourth magnetic body disposed on the fifth to eighth outer surfaces, respectively.
According to claim 2,
The housing is formed on the inner surface and connects the first to fourth inner surfaces and the first to fourth inner surfaces facing the first to fourth outer surfaces of the bobbin, and the fifth to fifth of the bobbin. 8 including the fifth to eighth outer surfaces facing the outer surface,
The coil portion is disposed on at least one of the first to fourth inner surfaces,
The metal plate is a lens driving motor disposed on at least one of the fifth to eighth inner surfaces.
The method of claim 7,
The coil driving motor includes a first coil disposed on the first inner surface, and a second coil disposed on the third inner surface facing the first inner surface.
The method of claim 8,
The metal plate includes a first to fourth metal plates disposed on the fifth to eighth outer surfaces, respectively.
The method of claim 8,
The housing is a lens driving motor including a coil part fastening hole in which the first coil and the second coil are disposed.
According to claim 1,
The bobbin is formed on the outer surface of the magnet driving groove for receiving the magnet portion, and a lens driving motor including a magnetic body receiving groove formed on the outer surface to receive the magnetic body.
According to claim 1,
The size of the magnet portion is a lens driving motor is formed larger than the size of the magnetic body.
According to claim 1,
The metal plate is formed in a square plate shape,
The magnetic body is a lens driving motor formed in a cylindrical shape.
According to claim 1,
The housing is formed on the inner surface and a lens driving motor including a plate receiving groove on which the metal plate is disposed.
According to claim 1,
A lens driving motor disposed below the bobbin and including a base coupled to the housing.
The method of claim 15,
A lens driving motor disposed on the base and including a Hall sensor unit overlapping the magnet unit in the optical axis direction.
The method of claim 16,
The hall sensor unit is a lens driving motor that does not overlap the metal plate and the magnetic body in the optical axis direction.
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