KR20210150195A - Actuator for folded zoom camera module and Compact camera containing the same - Google Patents

Abstract

Disclosed are an actuator applied to a folded zoom camera module including a reflective member that reflects incoming light at 90 degrees and transmits the same to an optical system, and an optical refraction camera module including the same. An optical refraction camera module actuator according to the present invention comprises: a reflective member for reflecting the incident light from the subject toward the image conversion unit; a first movable member on which the reflective member is mounted; and a fixing member for supporting the first movable member to be tiltable about the axis in the first direction with respect to the image conversion unit. A first tilting shaft having an arc shape is formed on the first movable member or the fixed member. A first tilting guide having a first arc-shaped groove for receiving the first tilting shaft is formed on the fixed member or the first movable member. The radius of curvature of the first groove is larger than the radius of curvature of the first tilting axis, thereby causing tilting of the first movable member about the first direction axis with respect to the image conversion unit due to the rolling motion of the first tilting axis on the first groove.

Description

Actuator for folded zoom camera module and Compact camera containing the same}

The present invention relates to an actuator for a camera module, and more particularly, to an actuator for an optical refractive camera module applied for optical image stabilizer to a folded zoom camera module, and a camera module including the same will be.

Recently, portable terminals such as smart phones (hereinafter referred to as 'mobile') are moving away from the existing simple phone function to keep pace with the advancement of technology, and are a multi-convergence system that can perform various functions such as music, movies, TV, and games. It is evolving, and one of the factors leading to the development of multi-convergence is the Camera Module.

The camera module mounted on the mobile is changed to a structure with various additional functions, such as an auto focus function and an optical zoom function, in order to meet the recent trend toward high-pixel and high-functionality based on user needs. are doing In particular, attempts to implement optical image stabilizer (image stabilization prevention) technology in a mobile size have been recently progressing from various angles.

Shake compensation technology is a technology that maintains the optimal resolution of the captured image by automatically controlling the focus of the lens assembly constituting the camera module to move in the direction against the shake. In order to implement this vibration compensation technology, a camera module applied to a mobile device, a camcorder, etc. is equipped with an actuator for compensation for vibration.

The VCM (Voice Coil Motor) type, well-known as an actuator for vibration compensation, is a method that uses the interaction of a magnetic field and an electric field. The VCM type usually includes a magnetic circuit composed of a face-to-face coil and a magnetic material, and uses the electromagnetic force generated by the magnetic circuit to move a lens-mounted drive part in a plane to compensate for vibration.

In general, a method of applying four magnetic circuits, two pairs facing each other in the two-axis direction, is adopted so that vibration can be corrected by moving the driving part in the X and Y two-axis directions. However, since the method of applying four magnetic circuits requires a large accommodating space, the size of the product increases and the device configuration becomes complicated, making it difficult to implement the product in a compact size.

There is also a VCM (Voice Coil Motor) type that uses the principle of interaction between magnetic and electric fields as well as the auto focus function provided along with the vibration compensation function. In addition, there is a close loop type that automatically adjusts the lifting position of the lens assembly through feedback control based on the position value recognized by the sensor. VCM and closed loop type can be clearly distinguished in terms of structure and control.

The VCM type is advantageous in terms of cost compared to the closed loop type, but has a disadvantage in that the driving precision is relatively low. On the other hand, the closed-loop type has disadvantages in terms of cost, such as an increase in manufacturing cost as parts such as sensors are required, but it has a mechanism that operates based on the position value confirmed by the sensor, so the driving precision is very high. There is this.

On the other hand, most of the camera modules mounted on the conventional mobile realize automatic focus control by moving the optical system composed of a plurality of lenses in the optical axis direction, which is the direction in which the light is introduced. At this time, the movement direction of the optical system becomes the thickness direction of the mobile when the camera module is mounted on the mobile. Therefore, in the prior art, it is necessary to secure a minimum space in which the optical system of the camera module can move in the mobile thickness direction.

That is, most conventional camera modules of a configuration in which the optical system moves in the thickness direction of the mobile have a structure that must secure a minimum space sufficient to mount them in the thickness direction of the mobile when mounted on the mobile. Therefore, there is a structural problem in that it is difficult to meet the market demand in the recent slimming trend to implement thinner mobile devices.

In order to solve this problem, there is a conventional method of reducing the size of the optical system itself by adjusting the angle, size, spaced apart distance, focal length, etc. of the lens, but this method is a method of physically reducing the size of a zoom lens or a zoom lens barrel Therefore, there is a limitation in achieving slimming, and there is a problem in that the essential characteristics of a zoom lens may be deteriorated.

By installing a reflective member that refracts the incoming light at 90 degrees, and laying down the optical system that allows the light refracted by the reflective member to pass in the width or length direction of the mobile to secure a sufficient distance between the lenses constituting the optical system, high magnification optics A folded zoom camera module that can implement zoom and achieve slimming has been proposed.

Unlike the conventional method of vertically stacking sensors (imaging devices such as CCD and CMOS) and lenses, this optical refraction camera module adopts a periscope structure to realize high magnification optical zoom without increasing the overall height. In addition, unlike the existing method of vertically stacking lenses, since it has a periscope structure, it has the advantage of being very advantageous in terms of slimming compared to the existing method.

Anti-shake technology is also applied to such a light refraction camera module. In the method of compensating for the shake of the optical refraction camera module, a lens or an imaging device is installed by moving the reflective member based on two axes parallel to the plane of the reflective member, or by coupling the reflective member to a fixed structure and rotating the reflective member in a specific direction. As a standard, there is a method of correcting the shake of the captured image.

Korean Patent Application Laid-Open No. 10-2018-0095420 'Reflecting module for hand shake correction and camera module including the same' corresponds to a technology for realizing shake compensation by moving an electronic reflective member, and Korean Patent Application Laid-Open No. 10-2018-0125989 The 'rotational ball-guided voice coil motor' disclosed through ' corresponds to the technique of realizing vibration compensation by rotating the latter, the reflective member.

Korean Patent Application Laid-Open No. 10-2018-0095420 'Reflecting module for hand shake correction and camera module including the same' and 'Rotary ball-guide voice coil motor' of Korean Patent Application Laid-Open No. 10-2018-0125989 are specific reflective members for stabilizing vibration. Although the driving mechanism is different, the ball-guide method has in common that the ball moves or rotates while the ball rolls or slides along the rail.

However, in the ball-guide method, due to the impact applied by the ceramic ball to the synthetic resin ball rail during a drop test that applies a direct impact to the ball rail or an actual drop, micro dents (ball dents) on the ball rail There is a problem in that the state of the captured image is deteriorated due to the deterioration of the behavioral characteristics of the reflective member.

There is a way to reduce the impact of the ball by increasing the size of the ball, but if the size of the ball is increased, the overall camera module size will be increased. In addition to this problem, vibration easily occurs even with minute changes in the ball rail, thereby deteriorating driving performance.

In addition, in the case of the ball-guide method, since considerable manufacturing precision is required for mounting a very small ball on a rail or groove, it takes a lot of time and inevitably increases the cost. In other words, it takes a lot of time and money as much as the precision of the work is required, so it is difficult to secure price competitiveness, and there are disadvantages in terms of mass productivity of the product.

Korean Patent Publication No. 10-2018-0095420 (published on August 27, 2018) Korean Patent Publication No. 10-2018-0125989 (published on November 26, 2018)

The technical problem to be solved by the present invention is a method that responds to vibration by rotating the reflective member in the two-axis direction while the tilting axis rolls along the arc-shaped groove, not the ball-guide method, and there is a risk of ball nicking. It is intended to provide an actuator applied to a light refraction type camera module that has no and stable behavior characteristics of the reflective member.

Another technical problem to be solved by the present invention is that it can exhibit improved driving performance with a simple configuration compared to the conventional ball-guide method, and does not require a separate lubrication work because it does not use a ball, reducing costs and improving mass productivity of products It is to provide an actuator for an optical refractive camera module that can achieve this.

According to one aspect of the present invention as a means of solving the problem,

a reflection member for reflecting the incident light from the subject toward the image conversion unit;

a first movable member on which the reflective member is mounted;

and a fixing member supporting the first movable member to be tiltable about an axis in the first direction with respect to the image conversion unit; and

A first tilting shaft having an arc shape is formed on the first movable member or the fixed member,

A first tilting guide having a first arc-shaped groove for accommodating the first tilting shaft is formed on the fixing member or the first movable member,

When the radius of curvature of the first groove is larger than the radius of curvature of the first tilting axis, the first movable member is tilted about the first axis with respect to the image conversion unit due to the rolling motion of the first tilting axis on the first groove. A type camera module actuator is provided.

The optical refractive camera module actuator according to an aspect of the present invention is also

a second movable member interposed between the reflecting member and the first movable member so that the reflecting member is tiltable with respect to the first movable member about an axis in a second direction perpendicular to the first direction; A second tilting shaft having an arc-shaped second tilting shaft is formed on the second movable member or the first movable member, and the first movable member or the second movable member has a second arc-shaped second groove for accommodating the second tilting shaft. A guide is formed, and the radius of curvature of the second groove is larger than the radius of curvature of the second tilting shaft, so that the second movable member moves the second axis with respect to the first movable member by the rolling motion of the second tilting shaft on the second groove. It may be configured to be tilted to the center.

In addition, the optical refraction camera module actuator according to an aspect of the present invention includes a first tilt driving unit that generates a driving force so that the first movable member can be tilted with respect to the fixed member about an axis in a first direction, and the second The movable member may further include a second tilt driving unit for generating a driving force so that the movable member can be tilted with respect to the first movable member about the axis in the second direction.

Here, the first tilt driving unit is preferably mounted on a pair of first magnets coupled with a magnet yoke to one side wall portion and the opposite side wall portion of the first movable member, and an FPCB partially enclosing the fixing member. and a pair of first coils disposed to face each of the pair of first magnets through first openings formed in both sidewalls of the fixing member.

And the second tilt driving unit, a second magnet coupled together with the magnet yoke to the lower surface of the second movable member, and a second opening that is mounted on the FPCB partially surrounding the fixing member is formed in the bottom plate of the fixing member It may be configured to include a second coil disposed to face the second magnet through the second coil, and a second coil yoke attached to the FPCB opposite to the surface on which the second coil is mounted.

At this time, a portion of the bottom plate of the first movable member may be opened so that the second magnet coupled to the second movable member and the second coil disposed in the second opening directly face each other. The second movable member may be in close contact with the first movable member by a suction force acting between the two coil yokes, and the first movable member may be in close contact with the fixed member.

Preferably, the first direction is a direction perpendicular to the incident light and is a direction in which the light reflected from the reflective member travels (optical axis direction), and the second direction is a direction perpendicular to the first direction on a plane perpendicular to the direction of the incident light. The direction may be orthogonal.

According to another aspect of the present invention as a means of solving the problem,

Actuator for a camera module according to the above-described aspect;

an optical system arranged in a first direction (optical axis direction) so that the light reflected through the reflective member of the actuator passes; and

An image conversion unit disposed behind the optical system based on the movement direction of the reflected light, receiving the light passing through the optical system, and outputting image information corresponding to the received light; do.

The actuator for a light refraction camera module according to an embodiment of the present invention responds to vibration by rotating (tilting) the reflective member in two directions while the tilting axis rolls along the arc-shaped groove, not the ball-guide method. Since it is a method of doing so, there is no risk of denting the ball as in the prior art. That is, it is possible to provide a highly reliable product with excellent durability of the device and stable behavioral characteristics of the reflective member.

In addition, compared to the existing ball-guide method, it has a simpler configuration, but because the tilting shaft responds to vibration while rolling, the friction force between the relative moving parts is greatly reduced to increase the driving efficiency. There is no need for lubrication, which is advantageous in terms of cost reduction and mass production of products.

1 is a completely exploded perspective view of an actuator for an optical refractive camera module according to an embodiment of the present invention.
Fig. 2 is a partially exploded perspective view of the actuator shown in Fig. 1;
Figure 3 is a perspective view of the actuator shown in Figure 1 coupled.
4 is a partial detailed view of the present invention showing a state in which the second movable member is coupled to the first movable member shown in FIG. 1 or FIG. 2 .
5 is a view of the configuration in which the second movable member is coupled to the first movable member as viewed in the direction of the arrow of FIG.
Figure 6 is a partial detailed view of the present invention showing a state in which the first movable member is coupled to the fixing member shown in Figure 1 or Figure 2;
FIG. 7 is a view in which the first movable member is coupled to the fixed member as viewed in the direction of the arrow of FIG. 6 .
FIG. 8 is a cut-away cross-sectional view of the actuator of FIG. 3 taken along line AA.
9 is a cut-away cross-sectional view of the actuator of FIG. 3 viewed from the line BB.
10 is a cut-away cross-sectional view of the actuator of FIG. 3 viewed from the CC line.
11 is a schematic configuration diagram of a camera module including an actuator for an optical refractive camera module according to an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail.

Terms used in the specification are used only to describe specific embodiments, and are not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly dictates otherwise.

In the present specification, terms such as “comprise” or “have” are intended to designate that a feature, number, step, operation, component, part, or combination thereof described in the specification exists, and includes one or more other features or It should be understood that the existence or addition of numbers, steps, operations, components, parts, or combinations thereof does not preclude the possibility of addition.

Also, terms such as first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The above terms are used only for the purpose of distinguishing one component from another.

In addition, terms such as “…unit”, “…unit”, “…module”, etc. described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software. can

In the description with reference to the accompanying drawings, the same reference numerals will be assigned to the same components for the same components, and overlapping descriptions thereof will be omitted. And, in the description of the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

The present embodiments, which will be described later, are applied to “portable user equipment”, and mobile refers to portable user equipment. However, these are only general terms, and the present embodiment includes a mobile phone, a palm sized personal computer (PC), a personal communication system (PCS), a personal digital assistant (PDA), and a portable PC. (HPC: Hand-held PC), smart phone, wireless LAN (Local Area Network) terminal, laptop computer, netbook, tablet personal computer, non-mobile game console, VR device (Virtual Reality) ), vehicles, etc., can be applied to various devices or fields.

Hereinafter, for convenience of description, a three-dimensional coordinate system will be used in the drawings.

Among the directions indicated in the three-dimensional coordinate system shown in the drawings, the first direction is a direction perpendicular to the light (incident light) incident on the reflective member, and indicates the direction in which the light reflected from the reflective member travels (optical axis direction), and the second direction is On a plane perpendicular to the direction of the incident light, a direction orthogonal to the first direction and a third direction indicate a traveling direction of the incident light, that is, a direction in which light is introduced (incident) from the outside to the reflective member.

1 is a completely exploded perspective view of an actuator for an optical refractive camera module according to an aspect of the present invention, and FIG. 2 is a partially exploded perspective view of the actuator shown in FIG. 1 . And FIG. 3 is a perspective view illustrating a coupled state of the actuator shown in FIG. 1 .

4 is a partial detailed view of the present invention showing a state in which the second movable member is coupled to the first movable member shown in FIG. 1 or 2, and FIG. 5 is a second movable member coupled to the first movable member It is a view viewed from the direction of the arrow in FIG. And FIG. 6 is a partial detailed view of the present invention showing a state in which the first movable member is coupled to the fixing member shown in FIG. 1 or 2, and FIG. 7 is a configuration in which the first movable member is coupled to the fixing member. 6 is a view viewed from the arrow direction.

In the actuator for a photorefraction camera module according to a preferred embodiment of the present invention, the light reflected from the subject does not directly flow into the optical system, and the path of light is changed (refracted or reflected) through the reflective member into the optical system. It is an actuator applied for optical image stabilizer to the incoming light refraction camera module (Folded zoom camera module).

1 to 7 , the actuator 2 for a light refractive camera module according to the present invention includes a reflective member 20 and a second movable member 22 fixing the reflective member 20 . The reflective member 20 reflects incident light from the subject toward the image conversion unit 5 (see FIG. 11 ), and the second movable member 22 exposes a portion of the reflective member 20 to be mounted. .

The reflective member 20 is a mirror or prism that reflects the incident light at an angle of 45 degrees with respect to the plane perpendicular to the third direction, which is the direction in which the reflective surface 200 refracts the incident light, is inclined at an angle of 90 degrees. ), and the second movable member 22 is the reflective member ( It is composed of both side wall portions 224 defining a space in which the 20) is to be mounted.

The actuator (2) according to the present invention also includes a first movable member (24) for accommodating the second movable member (22). The first movable member 24 is mounted on a fixing member 26 to be described later and is configured to accommodate the second movable member 22 in a state in which the reflective member 20 is fixed. Preferably, it may be composed of a bottom plate 242 having an opening 243 of a predetermined size, and side wall portions 244 disposed upright at both ends of the bottom plate 242 in the first direction.

Second tilting shafts 226 are formed on the outer surfaces of both sidewalls 224 of the second movable member 22 . In addition, second tilting guides 246 are formed on the upper ends of both sidewalls 244 of the first movable member 24 accommodating the second movable member 22 to correspond to the second tilting shaft 226 . At this time, the second tilting guide 246 has an arc-shaped second groove 247 having a size that can accommodate all or a part of the second tilting shaft 226 .

The radius of curvature R1 of the second groove 247 is at least greater than the radius of curvature R2 around the second tilting axis 226 . Therefore, the second tilting shaft 226 rolls along the groove surface of the second groove 247 by a drive force generated by the second tilt driving unit 27 to be described later, and thus a relatively fixed chain With respect to the first movable member 24, the second movable member 22 is tilted in a clockwise or counterclockwise direction with respect to the second tilting guide 246 in a counterclockwise or clockwise direction about the second direction axis. cancels tremors.

The first movable member 24 in which the second movable member 22 is accommodated is mounted on the fixed member 26 . The fixing member 26 is disposed upright at both ends of the bottom plate 262 and the bottom plate 262 in the second direction to face a pair of side wall portions 264 , and is perpendicular to the bottom plate 242 and is a pair The side wall portion 264 of the rear plate 266 to interconnect one end, as shown in the figure, the upper surface portion and one side portion may be completely open configuration.

A first opening 265 is formed in one side wall portion and the other side wall portion 264 of the fixing member 26 facing each other, and a second opening 263 is formed in the bottom plate 262 of the fixing member 26 . ) is formed. A first coil 284 of a first tilt driving unit 28 to be described later is disposed in the first opening 265 , and a second coil ( 284 ) of a second tilt driving unit 27 to be described later is disposed in the second opening 263 . 274) is placed.

A first tilting shaft 248 is formed in the second direction at the center of the lower surface of the first movable member 24 in the second direction. A first tilting guide 268 is formed in the center of the upper surface of the bottom plate 242 of the fixing member 26 on which the first movable member 24 is mounted in the first direction corresponding to the first tilting shaft 248 . do. At this time, the first tilting guide 268 has an arc-shaped first groove 269 concave to a size capable of accommodating all or part of the first tilting shaft 248 .

The radius of curvature R3 of the first groove 269 is greater than the radius of curvature R4 of at least the circumference of the first tilting axis 248 . Therefore, the first tilting shaft 248 rolls along the groove surface of the first groove 269 with a drive force generated by the first tilt driving unit 28 to be described later, and, accordingly, the fixing member 26 As the first movable member 24 is tilted in a clockwise or counterclockwise direction with respect to the first tilting guide 268, the vibration generated in the counterclockwise or clockwise direction about the first direction axis is offset.

The clockwise or counterclockwise tilting of the second movable member 22 with respect to the first movable member 24 based on the second tilting guide 246 is a force generated by the aforementioned second tilt driving unit 27 . (Drive force) is implemented. And the clockwise or counterclockwise tilting of the first movable member 24 with respect to the fixing member 26 with respect to the first tilting guide 268 is a force generated by the first tilt driving unit 28 (Drive force) is implemented by

Hereinafter, the first tilt driving unit 28 and the second tilt driving unit 27 will be described in more detail.

First, a configuration of the first tilt driving unit 28 will be described.

The first tilt driving unit 28 includes a pair of first magnets 280 coupled with the magnet yoke 282 to the magnet mounting units 249 of both sidewalls 244 of the first movable member 24 . In addition, the pair of first magnets 280 are mounted on the FPCB 29 partially surrounding the fixing member 26 and through the first openings 265 formed in both sidewalls 264 of the fixing member 26 . ) and a pair of first coils 284 disposed to face each other.

An air core may be formed in the center of each of the first coils 284, and the Hall sensor H3 may be mounted in the air core of any one of the first coils 284 to form an electrical connection with the FPCB 29. can At this time, the Hall sensor H3 senses the magnetic force of the facing first magnet 280 and provides the sensed information to the driving element, and the driving element is a pair of second magnets based on the actuator driving command and Hall sensor H3 information. 1 coil 284 is controlled.

The intensity and direction of the current supplied to the pair of first coils 284 are simultaneously adjusted according to the control of the driving element, and as long as it corresponds to the electric field generated by the application of the current to the pair of first coils 284 Tilt the first movable member 24 clockwise or counterclockwise with respect to the fixing member 26 based on a drive force (the first tilting guide 268) due to the interaction between the magnetic fields of the pair of first magnets 280 force) is generated.

A driving device (not shown) may apply currents having the same strength but opposite flow directions to the pair of first coils 284 based on the actuator driving command and Hall sensor H information. Accordingly, as in the example of FIG. 7 , a force (Drive force, refer to arrow) having the same magnitude but opposite direction is generated in the right drive system and the left drive system, and as a result, the first tilting shaft 248 is rotated clockwise or counterclockwise torque is generated.

The first tilting axis 248 rolls along the groove surface of the first groove 269 in the direction and displacement corresponding to the direction and strength of the current applied to each of the pair of first coils 284 by this torque. and the first movable member 24 with respect to the fixed member 26 by the rotation of the first tilting shaft 248 according to the rolling motion clockwise or counterclockwise with respect to the first tilting guide 268 as a reference. By tilting, the vibration generated in the counterclockwise or clockwise direction around the first direction axis is canceled.

Next, the configuration of the second tilt driving unit 27 will be described.

The second tilt driving unit 27 includes a second magnet 270 coupled together with the magnet yoke 272 to the magnet mounting unit (refer to the partial enlarged view of FIG. 1 , 228) of the lower surface of the second movable member 22. . In addition, a second coil mounted on the FPCB 29 partially surrounding the fixing member 26 and disposed to face the second magnet 270 through the second opening 263 of the bottom plate 242 of the fixing member 26 . 274 and a second coil yoke 276 attached to the FPCB 29 opposite to the surface on which the second coil 274 is mounted.

A second magnet 270 coupled to the magnet mounting part 228 on the lower surface of the second movable member 22 and a second coil positioned in the second opening 263 of the bottom plate 242 of the fixing member 26 ( 274) directly faces as a part of the bottom plate 242 of the first movable member 24 is opened as described above, and the suction force between the second magnet 270 and the second coil yoke 276 due to this By this, the receptor is bound in a structure that is in close contact with the receptor, which is a relative concept.

That is, by the suction force between the second magnet 270 and the second coil yoke 276, the second movable member 22 receives a force to adhere to the first movable member 24 in the third direction, and the fixing member ( 26), the first movable member 24 receives a force to adhere in the third direction. As a result, the first and second tilting shafts 248 and 226 receive a force in a direction in close contact with the groove surfaces of the corresponding first and second grooves 269 and 247.

As the first and second tilting shafts 248 and 226 receive a force in a direction in close contact with the groove surfaces of the first and second grooves 269 and 247, the actuator 2 does not operate or the actuator When the applied power is cut off after power is applied to the reflective member at a neutral position where the curved points of the first and second tilting axes 226 and 248 are in line contact with the curved points of the first and second grooves 269 and 247, respectively. (20) can automatically align or return to a neutral position after movement.

The second coil 274 may have an annular shape in which an air core is formed in the center, and Hall sensors H1 and H2 may be mounted in the air core to form an electrical connection with the FPCB 29 . The Hall sensors H1 and H2 sense the magnetic force of the second magnet 270 and generate a corresponding signal to output it to the driving device, and the driving device includes an external input signal (actuator driving command) and Hall sensors H1 and H2. The second coil 274 is controlled based on the signal.

The intensity and direction of the current supplied to the second coil 274 are adjusted according to the control of the driving element, and as the current is applied to the second coil 274, the electric field generated by the second coil 274 and the second A force for tilting the second movable member 22 with respect to the first movable member 24 in a clockwise or counterclockwise direction based on a force (Drive force, the second tilting guide 246 ) due to the interaction between the magnetic fields of the magnet 270 . ) occurs.

By this force, the second tilting shaft 226 rolls along the groove surface of the second groove 247 in the direction and displacement corresponding to the direction and strength of the current applied to the second coil 274, With the rotation of the second tilting shaft 226 according to the rolling motion, the second movable member 22 is tilted clockwise or counterclockwise with respect to the first movable member 24 with respect to the second tilting guide 246 . The vibration generated in the counterclockwise or clockwise direction around the second direction axis is canceled.

1 to 3, reference numeral 21 denotes a shield can made of a magnetic material. In the shield can 21 , the second movable member 22 on which the reflective member 20 is mounted is assembled to the first movable member 24 , and this first movable member 24 is assembled to the fixed member 26 . In this state, by being coupled to the fixing member 26 so as to cover the edge of the opening on the upper side of the fixing member 26, it functions as a finishing material to prevent separation of the parts mounted on the fixing member 26 and for magnetic shielding.

The operation of the actuator for an optical refractive camera module according to a preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings.

First, let's take a look at vibration compensation by the second tilt driver (correction for vibration in a clockwise or counterclockwise direction centered on the second direction axis).

8 and 9 are views for explaining the operation of the present invention by the second tilt driving unit, and FIG. 8 is a cut-away cross-sectional view of the actuator of FIG. 3 as viewed in the AA direction, and FIG. 9 is the actuator of FIG. is a cross-sectional view viewed from the BB line.

8 and 9, the second magnet 270 coupled to the second movable member 22 and the second coil yoke 276 on the fixing member 26 side acts as a suction force, which is a pulling force. Accordingly, in a state in which power is not applied to the second tilt driving unit 27, the second tilting shaft 226 receives a force in a direction in which it closely adheres to the groove surface of the corresponding second groove 247 due to the suction force. .

Due to this, the curved point of the second groove 247 and the curved point of the second tilting shaft 226 are in line contact with each other. And the reflective member 20 mounted thereon is maintained in an accurately aligned state in a neutral position without being tilted (or rotated) in either clockwise or counterclockwise direction with respect to the second tilting guide 246 .

In this state, when a counterclockwise or clockwise vibration around the second direction axis is sensed, a current is applied to the second coil 274 through the FPCB 29 under the control of a driving element (not shown). More specifically, depending on whether the direction in which the shaking is sensed is counterclockwise or clockwise based on the second tilting guide 246 of FIG. is applied or, conversely, -/+ current is applied.

When +/- or -/+ current is applied to the second coil 274 as above by controlling the driving element according to the sense of vibration, the second coil 274 is magnetized according to the applied current to generate an electric field in a specific direction. The second movable member 22 is attached to the first movable member 24 based on a drive force (the second tilting guide 246) due to the interaction between the generated electric field and the magnetic field of the second magnet 270. force to rotate clockwise or counterclockwise) is generated.

Due to this force, the second tilting shaft 226 rolls along the groove surface of the second groove 247 in the direction and displacement corresponding to the direction and strength of the current applied to the second coil 274, Due to this, the second movable member 22 is tilted clockwise or counterclockwise with respect to the first movable member 24 with respect to the second tilting guide 246 in a counterclockwise or clockwise direction about the first axis. cancels the tremor.

In this vibration compensation, the Hall sensors H1 and H2 disposed in the air core of the second coil 274 sense a change in the distance of the second magnet 270 , and the driving element is the corresponding Hall sensors H1 and H2 ), the position of the second movable member 22 is recognized in real time based on the output information. Further, by feedback-controlling the second tilt driver 27 based on the recognized position value compared to the initial position, vibration correction in the second direction may be accurately implemented.

On the other hand, the force for tilting the second movable member 22 on which the reflective member 20 is mounted in the clockwise or counterclockwise direction based on the second tilting guide 246 after the vibration correction (the driving force of the second tilt driving unit) is When removed, the reflective member 20 and the reflective member 20 and it are mounted by the attraction force, which is a force acting between the second magnet 270 coupled to the second movable member 22 and the second coil yoke 276 on the side of the fixing member 26 . One second movable member 22 naturally returns to its original neutral position on the first movable member 24 .

Next, compensation for vibration by the first tilt driver (correction for vibration in a clockwise or counterclockwise direction centered on the first direction axis) will be described.

FIG. 10 is a view for explaining the operation of the present invention by the first tilt driving unit, and is a cut-away cross-sectional view of the actuator of FIG. 3 previously attached as viewed from the line C-C.

Referring to FIG. 10 , the first movable member 24 is positioned between the second movable member 22 and the fixing member 26 and the second magnet 270 and the fixing member coupled to the second movable member 22 ( 26) A suction force acts between the second coil yokes 276 on the side. Therefore, in a state in which power is not applied to the first tilt driving unit 28 , the first tilting shaft 248 receives a force in a direction in close contact with the groove surface of the corresponding first groove 269 .

Due to this, the curved point of the first groove 269 and the curved point of the first tilting shaft 248 are in line contact with each other. maintains precisely aligned in a neutral position on the fixing member 26 without being tilted (or rotated) in either clockwise or counterclockwise direction based on the first tilting guide 268 formed on the fixing member 26 do.

In this state, when counterclockwise or clockwise vibration about the second direction axis is sensed, the two first coils 284 oppositely arranged in the first direction through the FPCB 29 under the control of the driving element based on the vibration information. ), a current is applied at the same time.

More specifically, depending on whether the direction in which the shaking is sensed is counterclockwise or clockwise based on the first tilting guide 268 of FIG. A +/- current is applied to the first coil 284R and -/+ current is applied to the first coil 284L of the other side, or -/+ current is applied to the first coil 284R of one side at the same time. A +/- current is applied to the first coil 284L on the other side.

When currents are applied in opposite directions to the two first coils 284L and 284R as above by controlling the driving element according to the sense of vibration, the pair of first coils 284L and 284R are magnetized by the applied current. Thus, an electric field is generated, but an electric field having the same magnitude but opposite directions is generated in the first coil 284L located on the left and the first coil 284R on the right with reference to FIG. 10 .

Accordingly, the interaction between the electric field generated by the first coil 284L on the left and the magnetic field of the first magnet 280L and the electric field generated by the first coil 28R4 on the right side and the magnetic field of the first magnet 280R With the interaction of , a force (drive force, electromagnetic force) of the same magnitude but opposite in direction to the left drive system and the right drive system, as a result, a torque to rotate the first tilting shaft 248 clockwise or counterclockwise is generated.

The first tilting shaft 248 rolls along the groove surface of the first groove 269 in the direction and displacement corresponding to the direction and strength of the current applied to the two first coils 284 by this torque. Due to this, the first movable member 24 is tilted clockwise or counterclockwise with respect to the fixed member 26, which is a fixed body, based on the first tilting guide 268. This will cancel out the clockwise vibration.

In this vibration compensation, the Hall sensor H3 disposed in the air-core portion of the first coil 284 on one side senses a change in the distance of the first magnet 280 disposed face to face, and the driving element is the corresponding Hall sensor H3 ), the position of the first movable member 24 is recognized in real time based on the output information. Further, by feedback-controlling the first tilt driver 28 based on the recognized position value compared to the initial position, vibration correction in the second direction may be accurately implemented.

On the other hand, the force (first tilt driving unit 28) that tilts the first movable member 24 on which the second movable member 22 is mounted in the clockwise or counterclockwise direction based on the first tilting guide 268 after the vibration correction ) when the driving force) is removed, the first movable by the attraction force acting between the second magnet 270 coupled to the second movable member 22 and the second coil yoke 276 on the side of the fixing member 26 . The member 24 will naturally return to its original neutral position on the holding member 26 .

On the other hand, when the correction for the clockwise or counterclockwise vibration centered on the first axis and the correction for the clockwise or counterclockwise vibration about the second axis are simultaneously performed, structurally the fixing member 26 The movement of the first movable member 24 with respect to ) may have an influence in recognizing the exact position of the second movable member 22 with respect to the first movable member 24 .

That is, the Hall sensor of the second tilt driving unit 27 should detect only a change in the position of the second movable member 22 with respect to the first movable member 24. 26), as the second magnet 270 is also tilted clockwise or counterclockwise about the first direction axis by the movement of the first movable member 24 (see FIG. 10), the actual second tilt driving unit The Hall value of (27) includes not only a change in the position of the second movable member 22 with respect to the first movable member 24, but also a change in the position of the first movable member 24 with respect to the fixed member 26. information is also included.

As such, not only the change in the position of the second movable member 22 with respect to the first movable member 24 in the Hall value of the second tilt driving unit 27, but also the first movable member with respect to the fixed member 26 ( 24), if information about the change in position is included, correction of vibration by the second tilt driving unit 27 due to inaccurate position recognition of the second movable member 22 (clockwise or counterclockwise centered on the second direction axis) When compensating for directional shake), the control precision may decrease.

Therefore, the two Hall sensors H, 1 H2 are disposed in the air-core part of the corresponding coil (second coil 274) to form a symmetrical arrangement with respect to the center line of the second coil 274 in the first direction (FIG. 2). ), only the output value when the outputs of the two hall sensors H1 and H2 change in the same direction at the same time is recognized as the movement of the second movable member 22, and the outputs of the two hall sensors H1 and H2 are simultaneously output from each other It is preferable to configure the control algorithm so that the output can be ignored only when the output is in the opposite direction.

For example, in the direction in which the output of one Hall sensor (H1) of the two Hall sensors (H1, H2) is a - value and the output is output as a + value of the other Hall sensor (H2) on the other side of the opposite side, the two Hall sensors ( By configuring the control algorithm so that the outputs of H1 and H2 can cancel each other, the change in the position of the second magnet 270 according to the change in the position of the first movable member 24 with respect to the fixed member 26 is negligible. will do

In the conventional light refraction camera module, the ball-guide method generally applied for moving the reflective member is a drop test that applies a direct impact to the ball rail or the impact applied by a ceramic ball to a ball rail made of synthetic resin during actual fall. There is a problem in that the state of the captured image is deteriorated due to the occurrence of ball dents on the ball rail, which deteriorates the behavioral characteristics of the reflective member.

On the other hand, in the actuator for a light refraction camera module according to an embodiment of the present invention, the reflective member is rotated (tilted) in two directions while the tilting axis is rolling along the arc-shaped groove, not the ball-guide type, and vibrates. Since it is a method corresponding to the prior art, there is no risk of ball dents as in the prior art. That is, it is possible to provide a highly reliable product with excellent durability of the device and stable behavioral characteristics of the reflective member.

In addition, in the case of the conventional ball-guide method, since considerable manufacturing precision is required in mounting a ball of a very small size on a rail or a groove, it takes a lot of time to manufacture and inevitably increases the cost. In other words, it takes a lot of time and money as much as the precision of the work is required, so it is difficult to secure price competitiveness, and there are disadvantages in terms of mass productivity of the product.

On the other hand, according to an embodiment of the present invention, since it has a simpler configuration compared to the conventional ball-guide method, and the tilting axis responds to vibration while rolling, the friction force between the relative moving parts is greatly reduced, and the driving efficiency can be increased. As it does not use balls, there is no need for additional lubrication, which is advantageous in terms of cost reduction and mass production of products.

11 is a schematic diagram of a camera module including an actuator for a light refractive camera module according to a preferred embodiment of the present invention.

Referring to FIG. 11 , the optical refraction camera module 1 according to another aspect of the present invention is largely composed of an actuator 2 for the optical refraction camera module, an optical system O, and an image conversion unit 5 . Here, the actuator 2 for the camera module is the same as the actuator for the camera module described above. Therefore, a redundant description thereof will be omitted below.

The optical system O includes a lens barrel (symbol omitted). The lens barrel is reflected by the subject, is incident in the third direction, receives the reflected light through the reflective member of the actuator 2, and is aligned in the optical axis direction to pass the received light in the second direction. In this case, the lens barrel accommodates a lens group composed of a plurality of lenses, and each of the lenses may have the same or different optical characteristics such as focal length and refractive index.

The image conversion unit 5 disposed behind the optical system O based on the moving direction of the light receives the light passing through the optical system O. As shown in FIG. The image conversion unit 5 includes a substrate 52 and an image sensor 50 mounted on the substrate 52 . The image sensor 50 collects image information from the light passing through the optical system O, and the collected image information is output through the substrate 52 to the outside.

An IR filter 4 may be installed on an optical path between the optical system O and the image conversion unit 5 . The IR filter 4 filters a specific wavelength, preferably an infrared wavelength, included in the incident light, and allows the infrared wavelength filtered light to be projected on the image conversion unit 5 . Although the figure shows, for example, that the IR filter 4 is disposed between the optical system and the image conversion unit 5, the present invention is not limited thereto.

In the above, the first tilting shaft and the second tilting shaft are respectively formed on the first movable member and the second movable member, and the first tilting guide and the second tilting guide are respectively formed on the fixed member and the first movable member. However, on the contrary, since the first tilting guide and the second tilting guide are formed on the first movable member and the second movable member, and the first tilting shaft and the second tilting shaft are formed on the fixed member and the first movable member, such It should be noted that modifications may also be included within the scope of the present invention.

In the above detailed description of the present invention, only specific embodiments thereof have been described. However, it is to be understood that the present invention is not limited to the particular form recited in the detailed description, but rather, it is to be understood to cover all modifications and equivalents and substitutions falling within the spirit and scope of the present invention as defined by the appended claims. should be

1: Camera module 2: Actuator for camera module
4: IR filter 5: image conversion unit
20: reflective member 21: shield can
22: second movable member 24: first movable member
26: fixing member 27: second tilt driving unit
28: first tilt driving unit 29: FPCB
50: image sensor 52: substrate
222: mounting portion 224: side wall portion of the second movable member
226: second tilting axis 228: magnet mounting part
242: bottom plate of the first movable member 243: opening
244: side wall portion of the first movable member 246: second tilting guide
247: second groove 248: first tilting axis
249: magnet mounting portion 262: bottom plate of the fixing member
263: second opening 264: side wall portion of the fixing member
265: first opening 266: rear plate of the fixing member
268: first tilting guide 269: first groove
270: second magnet 272: magnet yoke
274: second coil 276: second coil yoke
280: first magnet 282: magnet yoke
284: first coil H1, H2, H3: hall sensor
O: optical system

Claims (9)

a reflection member for reflecting the incident light from the subject toward the image conversion unit;
a first movable member on which the reflective member is mounted;
and a fixing member for supporting the first movable member to be tiltable about an axis in the first direction with respect to the image conversion unit; and
A first tilting shaft having an arc shape is formed on the first movable member or the fixed member,
A first tilting guide having a first arc-shaped groove for accommodating the first tilting shaft is formed on the fixing member or the first movable member,
When the radius of curvature of the first groove is greater than the radius of curvature of the first tilting axis, the first movable member is tilted about the first axis with respect to the image conversion unit due to the rolling motion of the first tilting axis on the first groove. Expression camera module actuator.
The method of claim 1,
It further comprises;
A second tilting shaft having an arc shape is formed on the second movable member or the first movable member,
A second tilting guide having a second arc-shaped groove for accommodating the second tilting shaft is formed on the first movable member or the second movable member,
Light in which the radius of curvature of the second groove is larger than the radius of curvature of the second tilting axis, so that the second movable member is tilted with respect to the first movable member about the axis in the second direction by the rolling motion of the second tilting axis on the second groove. Articulated camera module actuator.
3. The method of claim 2,
a first tilt driving unit for generating a driving force so that the first movable member can be tilted with respect to the fixed member about an axis in a first direction; and
A second tilt driving unit for generating a driving force so that the second movable member can be tilted with respect to the first movable member about a second direction axis;
4. The method of claim 3,
The first tilt driving unit,
A pair of first magnets coupled together with a magnet yoke to one side wall portion and the opposite side wall portion of the first movable member;
A photorefractive camera module including a pair of first coils mounted on an FPCB that partially surrounds the fixing member and disposed to face each of the pair of first magnets through first openings formed in both sidewalls of the fixing member for actuators.
4. The method of claim 3,
The second tilt driving unit,
a second magnet coupled with a magnet yoke to the lower surface of the second movable member;
a second coil mounted on the FPCB partially surrounding the fixing member and disposed to face the second magnet through a second opening formed in the bottom plate of the fixing member;
An actuator for an optical refractive camera module comprising a second coil yoke attached to the FPCB opposite to the surface on which the second coil is mounted.
6. The method of claim 5,
An actuator for an optical refractive camera module in which a bottom plate of the first movable member is opened so that a second magnet coupled to the second movable member and a second coil disposed in the second opening directly face each other.
6. The method of claim 5,
An actuator for an optical refractive camera module in which the second movable member is in close contact with the first movable member and the first movable member is in close contact with the fixed member by a suction force acting between the second magnet and the second coil yoke.
3. The method of claim 2,
The first direction is a direction perpendicular to the incident light (optical axis direction),
The second direction is a direction orthogonal to the first direction on a plane perpendicular to the direction of the incident light.
An actuator for a camera module according to any one of claims 1 to 8;
an optical system arranged in a first direction (optical axis direction) so that the light reflected through the reflective member of the actuator passes; and
An image conversion unit disposed behind the optical system based on the movement direction of the reflected light, receiving the light passing through the optical system, and outputting image information corresponding to the received light; a photorefractive camera module comprising a.

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