KR101270656B1 - Af actuator for camera module - Google Patents

Abstract

PURPOSE: An AF actuator for a camera module is provided to obtain the accuracy and speed of auto-focusing and to make a movable body stably move with low current consumption. CONSTITUTION: An AF actuator(1) for a camera module comprises a stator(10), a movable body(20), and an actuator unit. A lens is mounted in the movable body. The actuator includes a permanent magnet(31) arranged in one surface of an inner wall of the stator; and a coil and a stopper(33) of a metal material which are arranged respectively in an outer wall facing the inner wall where the permanent magnet is arranged. The movable body is moved along an optical axis(CL) by the electromagnetic coherence of electromagnetic force generated in the coil and permanent magnetic force of the permanent magnet and stopped by the electromagnetic coherence formed between the permanent magnet and the metallic stopper.

Description

AF actuator for camera module

The present invention relates to an AF actuator for a camera module, and more particularly, an electromagnetic coupling force formed between a permanent magnetic force and an electromagnetic force by a movable member equipped with a lens, and a magnetic coupling force formed between the permanent magnetic force and the magnetic metal body. The present invention relates to an AF actuator for a camera module that performs focusing by adjusting a distance between a lens and an image sensor by performing movement and stop operations along an optical axis through current control.

Recently, various electronic devices such as PDAs, notebook computers, cameras, camcorders, and smartphones have been installed with a camera module to obtain an image of a subject whose focus is adjusted through a lens and an image sensor.

In addition, the AF actuator for the camera module provides a means for moving and stopping the lens so as to secure focus by adjusting the distance between the image sensor and the lens through the movement and stop operation of the mover fixing the lens.

The movement of the AF actuator mover for the camera module is implemented by an electromagnetic coupling force formed between the permanent magnetic force and the electromagnetic force.

In general, the movement and stop motion of the mover fixing the lens in the camera module uses the correlation between the restoring force according to the elastic modulus of the leaf spring and the electromagnetic coupling force of the permanent magnet and the coil.

Specifically, if the electromagnetic coupling force formed between the permanent magnet and the coil is higher than the restoring force of the leaf spring, the mover installed with the lens moves along the optical axis while pressing the leaf spring, and if the restoring force of the electromagnetic coupling force and the leaf spring is in parallel, the lens The mover equipped with the motor is stopped at one point of the optical axis.

However, the AF module for the camera module to which the leaf spring is applied has a bulky and slow reaction speed because the leaf spring is stacked in the stator, and the fatigue force of the leaf spring is increased due to the repeated use of the mover. As a result, the cycle is short.

In addition, when the lens-mounted mover performs a stop operation at one point of the optical axis, it is necessary to apply a current to the coil at all times, causing continuous consumption of current, which uses a battery that stores a limited current as a main power source. In portable optical devices, the use time of the battery may be shortened after charging.

In addition, the AF actuator for the camera module to which the plate spring is applied is accommodated in the stator, and the movable member moving along the optical axis is unable to form a stable support state with the stator, so that a bias (decenter) phenomenon or a distortion (tilter) phenomenon is inevitable in the movement process. As a result, it is pointed out that the image quality of the image sensor is deteriorated.

The object of the present invention devised to solve the above problems,

First, the stop operation of the mover equipped with a lens is configured to be implemented by the magnetic coupling force between the permanent magnet and the magnetic metal body to block the current supplied to the coil when the stop operation is performed,

Second, applying a bracket (or yoker) to the back of the permanent magnet to shield the permanent magnetic leakage to the outside, and the shielded permanent magnetic is directed to the permanent magnetic force to the coil and the magnetic metal body electromagnetic coupling force required for the moving operation of the mover Even for lower current supply,

Third, by forming a stable support structure between the mover and the stator, when the mover moves and stops along the optical axis, it prevents the mover (decenter) and distortion (tilter) generation of the mover,

Fourthly, by simplifying the structure by minimizing the number of parts constituting the AF module for the camera module, to provide a camera module AF actuator to ensure a stable quality while reducing manufacturing costs.

The above object is achieved by the following constitutions provided in the present invention.

The AF actuator for a camera module proposed by the preferred embodiment of the present invention,

A stator formed to accommodate the receiving space; A mover installed to be accommodated in the accommodating space of the stator and mounted with a lens; It is formed between the inner wall of the stator and the outer wall of the mover facing each other, comprising an actuator portion for implementing the movement and stop operation of the mover,

The actuator portion and the permanent magnet disposed on the inner wall surface of the stator; It comprises a coil and a stopper made of a magnetic metal material, respectively disposed on the outer wall of the mover facing the inner wall of the stator in which the permanent magnet is disposed,

The mover moves along the optical axis by electromagnetic coupling force formed between the electromagnetic force generated in the coil and the permanent magnet of the permanent magnet, and the mover is stopped by the magnetic coupling force formed between the permanent magnet of the permanent magnet and the stopper of magnetic metal material. Configured to

One inner wall surface of the stator on which the permanent magnet is disposed is formed through a bracket of magnetic metal material that forms a single body with the stator through insert injection,

The permanent magnet is attached to a bracket of magnetic metal material and is disposed on one inner wall surface of the stator, and the permanent magnetic force leaked to the rear surface of the permanent magnet is directed forward by the shielding action of the bracket disposed on the rear surface of the coil, and the stopper. It is characterized in that it is configured to diverge.

On the other hand, the AF module for a camera module proposed in another embodiment of the present invention,

A stator formed to accommodate the receiving space; A mover installed to be accommodated in the accommodating space of the stator and mounted with a lens; It is formed between the inner wall of the stator and the outer wall of the mover facing each other, comprising an actuator portion for implementing the movement and stop operation of the mover,

The actuator unit may include a coil disposed on an inner wall surface of one side of the stator; And a permanent magnet disposed on an outer wall of one side of the mover facing the inner wall of one side of the stator on which the coil is disposed, and the inner wall of one side of the stator on which the coil is disposed to form a stator and a unit through insert injection. It is formed through the magnetic metal bracket,

The mover moves along the optical axis by an electromagnetic coupling force formed between the electromagnetic force generated in the coil and the permanent magnet of the permanent magnet, and the mover is formed by the magnetic coupling force formed between the permanent magnet of the permanent magnet and the bracket of the magnetic metal material. And configured to stop.

As described above, the camera-mounted AF moves the mover mounted on the lens by the electromagnetic coupling force formed between the permanent magnet and the coil, and the mover mounted on the lens stops by the magnetic coupling force formed between the permanent magnet and the stopper. Proposed actuator.

Since the AF module for the camera module does not need to supply current to the coil when the mover equipped with the lens is stopped, it has an improved power saving and also does not include a leaf spring in which elastic force is deteriorated by repeated elastic deformation. It combines improved durability, while ensuring the speed and precision of auto focusing.

In the present invention, by locally supporting the mover and the stator and arranging guides parallel to the optical axis, the warp of the mover is prevented through local support through the guide while maintaining the state where the mover and the stator are entirely separated from each other. have.

In particular, since the mover and the stator form contact states by the guide portion, together with the stable support of the mover, the frictional force is reduced due to the reduction of the contact area between the stator and the mover, which enables stable movement of the mover while consuming low current.

In addition, in the present invention, by placing a bracket on the back of the permanent magnet to prevent the leakage of permanent magnetism, even if the strength of the electromagnetic force generated in the coil is weak, a strong electromagnetic coupling force for the movement of the mover can be formed between the stator and the mover. have.

Thus, stable movement of the mover is possible even if a small amount of current is supplied to the coil, which has improved power saving efficiency.

Further, in the present invention, the guide portion is integrally formed on the bracket, the bracket formed integrally with the guide portion is installed on the stator through the insert injection, and the stopper is integrally fixed to the mover through the insert injection. Silver can combine the improved quality stability while reducing the accompanying costs due to the improved manufacturing process and the simplified number of parts.

In addition, since the permanent magnet and the coil constituting the actuator part form a state of being accommodated in the 'c' shaped bracket in which the guide part and the shielding piece are integrally formed and the shielding space formed between the stoppers, the permanent magnet disposed in the shielding space is external. As a result of preventing the leakage of oil into the furnace or the introduction of magnetic force into the shielded space from the outside, it is possible to have improved operational stability.

Figure 1 shows the overall configuration of the AF module for the camera module proposed as a preferred embodiment of the present invention,
FIG. 2 is a view illustrating an assembly state of an actuator unit in an AF actuator for a camera module proposed as a preferred embodiment of the present invention.
3 is a view showing the movement and the stop state of the mover by the actuator in the AF module for a camera module proposed as a preferred embodiment of the present invention,
4 is a view illustrating a detailed configuration of a guide unit and a support state of a mover through the AF actuator for a camera module proposed as a preferred embodiment of the present invention.
Figure 5 shows the angle alignment of the mover through the flat projection formed on the mover.

Hereinafter, an AF actuator for a camera module proposed as a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 shows the overall configuration of the camera module AF actuator proposed in a preferred embodiment of the present invention, Figure 2 is a camera module AF actuator proposed in a preferred embodiment of the present invention, the assembled state of the actuator portion 3 shows a movement and a stop state of the mover by the actuator in the AF module for the camera module proposed as a preferred embodiment in the present invention, and FIG. 4 is a preferred embodiment in the present invention. In the proposed AF module for the camera module, it shows the detailed configuration of the guide portion, and the support state of the mover through it, Figure 5 shows the angle alignment state of the mover through the flat projection formed on the mover.

The AF actuator 1 for a camera module according to the present invention is disposed in front of the image sensor IS, as shown in FIGS. 1 to 5, and adjusts the distance between the lens L and the image sensor to adjust the image sensor IS. It performs the movement of movement and stop that provides the optimal focusing light.

The AF module (1) for the camera module includes: a stator (10) formed so that the accommodation space (10b) is recessed; A mover 20 installed to be accommodated in the accommodation space 10b of the stator 10 and having a lens L mounted thereon; The actuator unit 30 is formed between the inner wall of the stator 10 facing each other and the outer wall of the mover 20 to generate a thrust and a stop force for the movement and the stop operation of the mover 20 mounted with a lens. Wow; It includes a cover 11 to provide an installation space of the IR filter (not shown) and the image sensor (IS).

The stator 10 is made of an injection-molded object in which the object light entry hole 10a is formed, and a cover 11 in which a focus light entry hole 11a is formed is provided below the open receiving space 10b. Other light sources are introduced into the portions except for the balls 10a and 11a to reach the image sensor.

In addition, the mover 20 accommodated in the accommodation space 10b of the stator 10 is composed of an injection molded product formed with a lens mounting hole 21 on which the lens L is mounted.

When the movable element 20 is accommodated in the accommodation space 10b of the stator 10, the object light entry hole 10a formed in the stator 10 and the focus light entry hole 11a formed in the cover 11, and The lens mounting holes 21 formed in the mover 20 form a state in which they are aligned, and the center of these object light entry holes 10a and the center of the focus light entry holes 11a and the lens installation holes 21 are formed. ) Is the optical axis CL at the center.

In the present embodiment, the outer wall surface 20a of the movable part 20 on which the coil 32 and the stopper 33 of the actuator part 30 which will be described later are disposed is formed in a plane, and the outer wall except the one outer wall surface is formed. The surface is composed of curved surfaces so that the weight is reduced through volume reduction.

In addition, the receiving space 10b is formed in the stator 10 in a similar shape to the outer shape of the mover. When the movable element 20 is accommodated in the receiving space 10b, the inner wall surface 10c of one side of the stator 10 may be formed. One outer wall surface 20a of the mover 20 is to face each other.

In the present embodiment, the movable member 20 mounted with the lens L is moved between the inner wall surface 10c of the stator 10 facing each other and the outer wall surface 20a of one side of the mover 20 through an electromagnetic coupling force. And the actuator part 30 which stops the mover 20 through a magnetic coupling force.

In detail, in the present embodiment, a permanent magnet 31 configured to span the N pole and the S pole in the optical axis direction with respect to one surface is disposed on one inner wall surface 10c of the stator 10, and movable to face the same. The coil 32 and the stopper 33 are disposed on the outer wall surface 20a of the ruler 20, respectively, so that the single actuator unit 30 moves and stops the mover 20.

In this way, the actuator portion is not disposed on each of the inner wall surfaces of the stators facing each other and the outer wall surfaces of the movers, and one inner wall surface 10c of the stator 10 facing each other and one outer wall surface of the mover 20 ( If the actuator unit 30 is disposed only in 20a), the number of parts is reduced, thereby reducing ancillary costs associated with manufacturing and reducing weight.

At this time, the outer wall surface 20a of the mover 20 is formed with a pair of abutment protrusions 22a and 22b spaced apart from each other, and the actuator unit 30 is formed through the pair of abutment protrusions 22a and 22b. The stopper 33 and the coil 32 to be configured to be fixed in position

In detail, the stopper 33 made of a magnetic metal material is fixed between the adhesive protrusions 22a and 22b and the hollow of the coil 32 is fixed to the adhesive protrusions 22a and 22b.

Accordingly, the stopper 33 and the coil 32 are fixed to the outer wall surface 20a of one side of the mover 20 through a pair of adhesive projections 22a and 22b.

Of course, the stopper 33 made of a magnetic metal material may be fixed to the movable member 20 which has been injection-molded as described above through a separate assembly process.

However, in the present embodiment, in injection molding the mover 20, the stopper 33 made of a magnetic metal body is insert-injected so that the mover 20 and the stopper 33 form a unitary body. The coil 32 is affixed and fixed to the movable element 20 in which 33 is integrally formed.

In this embodiment, the permanent magnet is formed on one inner wall surface 10c of the stator 10 through a two-pole magnetization method, and the magnetic poles of the N pole and the S pole are vertically divided by one pole separation line on one side thereof. 31).

In addition, in the present embodiment, a magnetic metal bracket (or yoke) surrounding the rear surface of the permanent magnets 31 is disposed on the rear surface of the permanent magnets 31, and the permanent magnetic force is formed on the rear surface of the permanent magnets 31. This leakage is shielded and the shielded permanent magnetic force is directed toward the front surface where the coil 32 and the stopper 33 are disposed, and the external magnetic force is introduced into the actuator part 30 to prevent the phenomenon of interference. .

In this embodiment, the bracket 12 is manufactured in a 'c' shape surrounding the rear surface of the permanent magnet 31, the coil 32 disposed in front of the permanent magnet 31, and the side of the stopper 33. As shown in FIG. 4C, a rectangular shielding space S is formed through the 'c' shaped bracket 12 and the stopper 33 disposed in the opening of the 'c' shaped bracket 12.

As such, the shielding shields the permanent magnetic force leaking to the rear surface of the permanent magnet 31 through the bracket 12 disposed on the rear surface of the permanent magnet 31, and the shielded permanent magnetic force is applied to the coil 32 and the stopper 32. When configured to diverge in a forward direction to be disposed, the permanent magnetic force of stronger strength reaches the coil 32 and the stopper 32 disposed close to the front surface of the permanent magnet 31.

Thus, even if the strength of the electromagnetic force generated in the coil 32 is weak, an electromagnetic coupling force for the movement of the mover 20 is formed between the stator 10 and the mover 20.

Therefore, even if the driving circuit unit reduces the supply amount of current to the coil 32, the mover 20 can implement a moving operation through a stable electromagnetic coupling force can reduce the current consumption required for the moving operation of the mover.

At this time, the bracket 12 may be installed through a separate assembly process to the injection-molded stator 10.

However, in the present embodiment, the bracket 12 and the stator 10 are integrally molded by insert injection so that the bracket 12 and the stator 10 form a unitary body.

The permanent magnet 31 constituting the actuator part 30 is attached to the bracket 12 having the inner wall surface 10c of the stator 10 by the insert injection method.

In addition, in the present exemplary embodiment, the lead wire 32a and the lead wires 32a and 32b of the coil 32 and the output terminal (not shown) of the driving circuit part have a terminal Pad and a line to enable electrical connection. An electric circuit board 34 in the form of a PCB or an F-PCB is constructed.

At this time, it is more preferable to embed the driving circuit portion in the electric circuit board 34 so as to form a contact point with the lead wire and the lead wire of the coil 32.

Accordingly, the coil 32 emits electromagnetic forces of different polarities with respect to one surface of the coil according to the direction of the current supplied from the driving circuit unit through the electric circuit board 34, and the mover 20 is the coil 32. The distance between the lens (L) and the image sensor (IS) mounted forward or backward along the optical axis (CL) through the electromagnetic coupling force formed between the electromagnetic force emitted from the) and the permanent magnetic force emitted from the permanent magnet (31) Will be adjusted.

That is, when a forward current is supplied to the coil 32 by the driving circuit unit as shown in FIG. 3A, an electromagnetic force of N pole is generated on one surface of the coil 32, so that the mover 20 having the coil 32 fixedly disposed is N. FIG. The electromagnetic coupling force generated between the coil of polarity and the S pole of the permanent magnet manufactured by the one-sided two-pole magnetization method advances and moves (moves) the S pole of the permanent magnet 31 (upward direction). Thus, the distance between the lens L and the image sensor is widened.

On the contrary, when the reverse direction current is supplied to the coil 32 by the driving circuit unit as shown in FIG. 3B, an electromagnetic force of the S pole is generated on one surface of the coil 32. Retreat to the N-pole direction (lower direction) of the permanent magnet 31 by the electromagnetic coupling force generated between the S-pole coil and the N-pole part of the permanent magnet manufactured by the one-sided 2-pole magnetization method (movement direction shifting operation). As a result, the distance between the lens L and the image sensor becomes narrow.

At this time, the electromagnetic coupling force is formed by the electromagnetic force emanating from the coil 32 and the permanent magnet emanating from the permanent magnet 31 to promote the movement of the movable element 20. The electromagnetic coupling force is the permanent magnet 31 and the magnetic metal body. It is greater than the magnetic coupling force formed between the stoppers 33 of the material.

When the driving circuit unit cuts off the current supply to the coil 32 as shown in FIG. 3C, the mover stops by a magnetic coupling force which is always formed between the stopper 33 made of the magnetic metal material and the permanent magnetic force of the permanent magnet 31. By doing this, the lens L mounted on the mover at one point of the optical axis CL is fixed in position.

The AF actuator for a camera module of the present invention is provided between the lens L and the image sensor IS by moving and stopping the mover 20 equipped with the lens L according to the supply current control of the driving circuit unit. Adjust the interval. In addition, the driving circuit unit performs an AF function to control the current supply direction of the coil 32 and the supply direction of the current to form an optimal focus light in the image sensor IS.

On the other hand, as in the present embodiment, the actuator portion 30 is formed only between the bracket 12 which forms the inner wall surface 10c of one side of the stator 10 facing each other, and the outer wall surface 20a of the one side of the mover 20. When arranged, the movable member 20 mounted with the lens L in the receiving space 10b of the stator 10 by the electromagnetic coupling force generated by the actuator part 30 or the magnetic coupling force is biased relative to the optical axis ( Decenter) or distortion (tilter) may occur.

As such, when the movable member 20 equipped with the lens L is distorted or biased with respect to the optical axis, the focus formed between the lens L and the image sensor IS may be disturbed. The image quality of the image sensor will be degraded.

In order to solve this problem, in this embodiment, the bracket forming the outer wall surface 20a of the mover 20 on which the actuator part 30 is disposed and the inner wall surface 10c of the stator 10 facing the same ( The inner wall of 12) is taken as the reference plane.

Then, a contact portion for contacting the mover 20 and the stator 10 in a surface contact or a line contact state is formed at corner portions located at both sides of the reference surface, so that the inner wall surface of the stator 10 except the contact portion and the mover ( The outer wall surface of 20) is kept in a spaced state so as to be non-friction.

At this time, in order to prevent the bias (decenter) and the distortion (tilter), when manufacturing the AF actuator for the camera module, the part to be configured to be formed parallel to the optical axis on the basis of the optical axis is the movable part 20 and the stator 10 ) Is a contact portion that is circumscribed between and, and the portion to be configured to be orthogonal to the optical axis is the image sensor IS and the lens L.

In this embodiment, a straight comb surface 23 parallel to the optical axis CL is formed on both sides of one outer wall surface 20a of the mover 20 on which the coil 32 and the stopper 33 are disposed, and the insert injection method is used. The guide portion 12b having a straight comb surface 12b-a is integrally formed at both ends of the 'c' shaped bracket 12 which is manufactured to form one inner wall surface 10c of the stator 10, and these straight shapes The movable part 20 is supported in local contact with the inner wall of the stator 10 through a contact part formed of the inclined surface and the guide part.

At this time, if the oil film is formed by applying a lubricant to the contact portion formed between the mover 20 and the stator 10, it is possible to reduce the friction force that reduces the movement operation of the mover 20.

In addition, according to the current control (PWM method) of the driving circuit unit, it is possible to reduce the PWM noise, which is a mechanical noise generated in the contact portion, and is generated as the flat comb 23 of the mover 20 is worn by frequent movement. Dust can be absorbed by the oil film and spread to the surroundings.

In addition, when the movable member 20 mounted with the lens L is moved in the receiving space 10b of the stator 10 through a contact portion parallel to the optical axis CL, the upper portion of the movable member 20 is moved. Surface and bottom surface, and the bottom surface of the receiving space facing the stator 10, the upper surface of the cover in contact with the lower bottom surface of the mover, and the image sensor fixed to the cover mounting image sensor mounting surface is perpendicular to the optical axis It can be seen that the lens installation hole of the mover is configured to be parallel to the optical axis to improve the problem of the bias and distortion.

In addition, the difficulty of manufacturing the flatness of the upper surface and the lower surface of the mover 20, the upper surface of the cover and the upper surface of the stator receiving space during the production of the injection molding and the foreign matter is perpendicular to the optical axis when the foreign matter is caught in the surface Can be.

To compensate for this, in the present embodiment, the flat projections 24 are formed on the upper and lower surfaces of the mover 20, respectively, and the upper surfaces of the mover 20 through the flat projections 24 as shown in FIG. By forming the lower and the lower surface in contact with the upper surface of the cover 11 and the bottom surface of the stator 10 to form a state orthogonal to the optical axis.

AF of the present invention by constructing a structure for maintaining parallel and orthogonality (flat projection, image sensor mounting surface, etc.) by dividing the portion to be parallel (contact portion) and the portion to be orthogonal (image sensor, lens) based on the optical axis. The actuator is prevented from being distorted and distorted to prevent a problem of deterioration in image quality when the focus light passing through the lens is captured by the image sensor.

On the other hand, when the stator 10 and the cover 11 are combined, the stator and the cover 11 are formed on a coupling surface of the stator and the cover in a lattice structure in which a groove shape and a projection shape are symmetrically formed on the stator and the cover. By combining, the foreign matter is prevented from entering the side wall of the AF actuator, thereby providing an external foreign matter prevention effect.

In addition, in mounting the lens to the movable member, the lens mounting hole 21 includes a mounting method by a screw-line fastening method by a lens barrel, and inserts and arranges aspherical lenses in the lens mounting hole and then closes the insertion hole. It can also be configured as.

As a preferred embodiment of the arrangement structure of the actuator portion of the present invention, a magnetic metal metallic bracket is manufactured by insert injection method to be integrated with the stator, and the stator has a permanent magnet manufactured by one-sided two-pole magnetization method. The coil actuator and the stopper made of a magnetic metal material were arranged on the mover to describe the coil actuator AF actuator in which the coil moves the mover according to the supply current control of the driving circuit unit.

In addition, as another preferred embodiment of the arrangement structure of the actuator portion, a bracket of magnetic metal material is manufactured by insert injection method to be integrated into the stator, the coil is arranged on the stator, the magnetic metal of the metal material Brackets can act as stoppers, and permanent magnets made of one-pole two-pole magnetizers can be placed on the movers, and permanent magnets can be used as AF actuators in which permanent magnets move the movers according to the supply current control of the driving circuit. This is also intended to be the scope of the present invention.

The actuator for the AF of the coil movement method and the permanent magnet movement method applies an electric circuit board to implement an electrical connection state between the coil and an external terminal, and the electric circuit board controls a supply current for driving the AF actuator. It can be mounted to the drive circuit unit, and can be fixed to the inner wall surface of the stator, including the inner wall surface and the outer wall surface of the cover of the AF actuator, in particular the permanent magnet moving type AF actuator is a coil and drive to the electric circuit board The circuit part is mounted and fixed to the inner wall surface of the bracket.

1. Actuator for AF
10. Stator 10a. Subject light entry hole
10b. Receiving space 10c. One side inner wall surface
10d. Fixation projection
11. Cover 11a. Focus light entry hole
12. Bracket 12a. Shield
12b. Guide portion
20. Mover 20a. One side wall surface
21. Lens Mounter 22a, 22b. Adherent projection
23. Flat slant 24. Flat protrusion
30. Actuator section 31. Permanent magnet
32a. Incoming line 32b. Leader
33. Stopper 34. Electrical circuit board
CL. Optical axis
S. Shielded Space

Claims (10)

A stator formed to accommodate the receiving space; A mover installed to be accommodated in the accommodating space of the stator and mounted with a lens; It is formed between the inner wall of the stator and the outer wall of the mover facing each other, comprising an actuator portion for implementing the movement and stop operation of the mover,
The actuator portion and the permanent magnet disposed on the inner wall surface of the stator; It comprises a coil and a stopper made of a magnetic metal material, respectively disposed on the outer wall of the mover facing the inner wall of the stator in which the permanent magnet is disposed,
The mover moves along the optical axis by electromagnetic coupling force formed between the electromagnetic force generated in the coil and the permanent magnet of the permanent magnet, and the mover is stopped by the magnetic coupling force formed between the permanent magnet of the permanent magnet and the stopper of magnetic metal material. While configured to
One inner wall surface of the stator on which the permanent magnet is disposed is formed through a bracket of magnetic metal material that forms a single body with the stator through insert injection,
The permanent magnet is attached to a bracket of magnetic metal material and is disposed on one inner wall surface of the stator, and the permanent magnetic force leaked to the rear surface of the permanent magnet is directed forward by the shielding action of the bracket disposed on the rear surface of the coil, and the stopper. AF actuator for a camera module, characterized in that configured to diverge. A stator formed to accommodate the receiving space; A mover installed to be accommodated in the accommodating space of the stator and mounted with a lens; It is formed between the inner wall of the stator and the outer wall of the mover facing each other, comprising an actuator portion for implementing the movement and stop operation of the mover,
The actuator unit may include a coil disposed on an inner wall surface of one side of the stator; And a permanent magnet disposed on an outer wall of one side of the mover facing the inner wall of one side of the stator on which the coil is disposed, and the inner wall of one side of the stator on which the coil is disposed to form a stator and a unit through insert injection. It is formed through the magnetic metal bracket,
The mover moves along the optical axis by an electromagnetic coupling force formed between the electromagnetic force generated in the coil and the permanent magnet of the permanent magnet, and the mover is formed by the magnetic coupling force formed between the permanent magnet of the permanent magnet and the bracket of the magnetic metal material. AF actuator for a camera module, characterized in that configured to stop. The AF actuator of claim 1, wherein the stopper made of the magnetic metal body is integrally formed on one outer wall of the mover through insert injection. The AF actuator of claim 1, wherein a pair of abutment protrusions are formed on an outer wall surface of the mover to be spaced apart from each other, and the coil is fixed by attaching a hollow to the abutment protrusions. According to claim 1, wherein the bracket is made of a 'c' shape surrounding the back of the permanent magnet, the coil disposed in front of the permanent magnet, and the side of the stopper, disposed in the 'c' shaped bracket and the opening of the bracket AF actuator for a camera module, characterized in that the shielding space is formed between the stator and the mover through the stopper. According to claim 1 or 2, The stator is provided with a cover for closing the receiving space,
The cover has an electric circuit board with a built-in drive circuit portion, the lead wire and the lead wire of the coil is configured to form a contact with the drive circuit portion through the electric circuit board, the AF module for the camera module. According to claim 1 or 2, wherein the stator is provided with a cover for closing the receiving space, the upper and lower surfaces of the mover is formed with a flat projection, the mover is the upper surface of the cover through the flat projection, or By configuring the bottom of the stator to contact
An actuator for the AF of a camera module, characterized in that the flat surface of the cover, or the movable member that is in contact with the bottom surface of the stator, is configured to maintain flatness by orthogonal to the optical axis. The AF actuator according to claim 1 or 2, wherein the permanent magnet is manufactured in a one-pole bipolar magnetization manner, and the N-pole and the S-pole are partitioned on one surface of the magnetic pole separation line. According to claim 1 or 2, wherein both ends of the bracket forming the one inner wall surface of the stator is formed integrally with a guide parallel to the optical axis, and the inclined surface is formed on both ends of the outer wall surface of the mover to be external to the guide Became,
The actuator is a AF actuator for a camera module, characterized in that configured to move and stop in a state locally supported on the inner wall of the stator through a contact portion consisting of a bevel and a guide. 10. The AF actuator of claim 9, wherein an oil film is formed by applying a lubricant to the contact portion.

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