Actuator for camera

Abstract

An actuator for a camera according to an embodiment of the present invention is characterized by comprising: a reflector that reflects light of a subject toward an image sensor provided in an inclined form, and a reflection surface of the reflector having an inclination angle different from an inclination angle of the image sensor; a carrier provided with the reflector; a drive unit that moves the carrier forward and backward in the direction of the image sensor; a housing supporting movement of the carrier; the guide rail is arranged on one or more of the shell and the carrier; and a ball disposed on the guide rail.

Description

Technical Field

[0001] The present invention relates to an actuator for a camera, and more particularly, to an actuator for a camera in which driving accuracy is further improved by improving a structure for physically supporting movement of a carrier, etc. Background Art

[0002] With the development of hardware technology for image processing and the increase in user demand for image capture, etc., functions such as auto focus (AF) and optical image stabilization (OIS) have been applied to independent camera devices and camera modules installed in mobile terminals such as mobile phones and smartphones.

[0003] The autofocus (auto focus) function is a function that adjusts the focal distance with the subject by moving a carrier equipped with a lens etc. along the optical axis, thereby generating a clear image in an image sensor (CMOS, CCD, etc.) provided at the rear end of the lens.

[0004] The optical image stabilization function is a function for improving the clarity of an image by adaptively moving a carrier on which a lens (or image sensor) is mounted in a direction to compensate for the shaking of the lens or image sensor due to hand shaking.

[0005] One of the representative methods for realizing the autofocus function or OIS function is to set a magnet (coil) on the mover (carrier) and set a coil (magnet) on the stator (housing, base or other forms of carrier, etc.), and then generate a driving force between the coil and the magnet to move the mover along the optical axis or in a direction perpendicular to the optical axis.

[0006] Recently, an actuator having a structure that refracts the light of a subject that has passed through a lens toward an image sensor using a reflector has been disclosed in order to improve space utilization, etc. In the case of such an actuator, the focus, etc. is adjusted by moving a carrier on which the reflector is mounted forward and backward in the direction of the image sensor.

[0007] Image sensors are usually fixed in an upright position on a mainboard of an application device such as a smartphone. Therefore, when a carrier provided with a reflector for AF or the like approaches or moves away from the image sensor, the light of the subject is shifted in the vertical direction based on the reference position as the position of the carrier changes.

[0008] In this way, the light reflected from the reflector and incident on the image sensor is shifted, and accordingly, the image data of the object may also be shifted.

[0009] In order to solve this existing problem, an algorithm for post-correcting the image data is mainly applied. However, this method is a method of accurately calculating the movement amount of the dynamically changing carrier and applying an appropriate correction algorithm accordingly, so not only the processing speed may be reduced, but also in order to improve the image deviation, it is inevitable to remove the image data of the edge area, so it is impossible to provide an image that accurately matches the desired shooting area. Summary of the invention

[0010] Technical issues to be solved The present invention is made to solve the problems described in the background technology as mentioned above, and its purpose is to provide an actuator for a camera, which improves the structure of guiding the physical movement of a carrier so that the posture of the carrier can naturally change with the moving position of the carrier provided with a reflector, so that regardless of the position of the carrier, the light of the subject can always be maintained at the same position.

[0011] Other purposes and advantages of the present invention will be understood through the following description and will be more clearly understood through the embodiments of the present invention.In addition, the purposes and advantages of the present invention can be achieved through the structures and combinations of structures appearing in the claims.

[0012] Means of solving the problem An actuator for a camera according to an embodiment of the present invention for achieving the above-mentioned purpose may be constructed to include: a reflector, which reflects light of a subject toward an image sensor arranged in an inclined state, and a reflecting surface of the reflector has an inclination angle different from the inclination of the image sensor; a carrier, on which the reflector is provided; a driving unit, which enables the carrier to move forward and backward in the direction of the image sensor; a shell, which supports the movement of the carrier; a guide rail, which is provided in one or more of the shell and the carrier; and a ball, which is arranged on the guide rail.

[0013] Preferably, the guide rail of the present invention may include an inclined portion that inclines the posture of the carrier when the carrier moves.

[0014] In addition, preferably, the reflector is provided on the carrier in such a manner that when a horizontal plane reference angle of the image sensor is A°, the angle of the reflecting surface is 0.5A° with reference to the horizontal plane.

[0015] Specifically, the guide rail of the present invention may include: a first guide rail having a shape extending along the direction in which the carrier moves; and a second guide rail having a shape extending along the direction in which the carrier moves and disposed at a position closer to the image sensor than the first guide rail.

[0016] In addition, preferably, the first guide rail of the present invention is configured to include a shape that becomes lower as it goes toward the image sensor.

[0017] Further, preferably, the second guide rail of the present invention includes a shape that becomes higher toward the image sensor.

[0018] According to an implementation, the camera actuator according to an embodiment of the present invention may further include an OIS carrier, in which a lens is mounted, moves along two directions orthogonal to each other with a horizontal plane as a reference, and is accommodated in the carrier. In this case, the reflector of the present invention reflects the light of the subject that has passed through the lens toward the image sensor.

[0019] Effects of the Invention According to a preferred embodiment of the present invention, since a structure is used in which a reflector is used to refract the light path of the object that has passed through the lens, the space utilization rate of the actuator can be further improved.

[0020] According to the present invention, the posture of the carrier that changes with the moving position of the reflector, that is, the angle at which the light passing through the lens is incident on the image sensor, can be dynamically changed only through simple structural improvements, thereby fundamentally solving the problem of light shift of the subject incident on the image sensor even without using a complex post-correction algorithm.

[0021] According to the present invention, the path of the light generated by the reflector is changed through a physical structure, so that the clarity of the action relationship can always be maintained, and no post-processing process is required, thereby further improving the accuracy and immediacy of AF driving. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following drawings attached to this specification illustrate preferred embodiments of the present invention and, together with the detailed description of the present invention described later, serve to more effectively understand the technical ideas of the present invention. Therefore, the present invention should not be interpreted as being limited to the matters recorded in such drawings.

[0023] Figure 1 is a diagram showing the overall structure of a camera actuator according to a preferred embodiment of the present invention; Figure 2 is a diagram showing a carrier and a detailed structure related thereto according to an embodiment of the present invention; Figure 3 is a diagram illustrating a structure for reflecting light from a subject toward an image sensor; Figure 4 is a diagram illustrating a guide rail, etc. according to the present invention; Figure 5is a diagram illustrating a guide rail, etc. according to the present invention; Figure 6 is a diagram for explaining the light path that changes according to the posture change of the carrier; Figure 7 is a diagram showing a first guide rail and a second guide rail according to another embodiment of the present invention; Figure 8 is a diagram showing a detailed structure of the present invention for implementing OIS; Fig. 9 : is a diagram showing a detailed structure of the present invention for realizing OIS.

[0024] Description of Reference Numerals 1000: Actuator 30: Lens 2000: Image sensor 100: carrier 110A: first guide rail 110B: Second guide rail 120: Second track 200: reflector 300: lens carrier 310: First rail 400: Intermediate guide 410: First track 420: Second track 500: housing 510A: first guide rail 510B: Second guide rail 560: Sub-yoke 600: second circuit substrate 700: first circuit board 800: Housing CA: AF Coil MA: AF magnet BA: AF ball C1 (2): first (second) coil M1 (2): first (second) magnet B1(2): First (Second) OIS Ball MS: Sub-Magnet DETAILED DESCRIPTION Hereinafter, the preferred embodiments of the present invention will be described in detail with reference to the attached drawings. Prior to this, the terms or words used in this specification and claims cannot be interpreted as the commonly used or dictionary-defined meanings, and should be interpreted as the meanings and concepts that conform to the technical ideas of the present invention based on the principle that the inventor can appropriately define the concepts of the terms in order to explain his invention in the best way.

[0025] Therefore, the embodiments described in this specification and the structures shown in the accompanying drawings are merely the most preferred embodiments of the present invention and cannot represent the entire technical concept of the present invention. It is understandable that there may be a variety of equivalents and modifications that can replace them for this application.

[0026] Figure 11 is a diagram showing the overall structure of a camera actuator (hereinafter referred to as “actuator”) 1000 according to a preferred embodiment of the present invention. Figure 2 1 is a diagram showing a carrier 100 and a detailed structure related thereto according to an embodiment of the present invention. Figure 3 This is a diagram for explaining a structure for reflecting light from a subject toward the image sensor 2000 .

[0027] Hereinafter, the overall structure of the present invention and an embodiment of the present invention for implementing AF will be described first, and a detailed description of an embodiment of the present invention for implementing OIS will be described later.

[0028] Figure 1 The actuator 1000 of the present invention illustrated in the examples is an embodiment that realizes AF and OIS together, but it goes without saying that the actuator 1000 of the present invention can also be realized as an actuator only for AF according to the implementation mode.

[0029] As shown in the figure, the actuator 1000 of the present invention may include a carrier 100 , a reflector 200 , a lens carrier 300 , an intermediate guide 400 , a housing 500 and a casing 800 .

[0030] The housing 500 providing the internal space is equivalent to the basic frame structure of the actuator 1000 according to the present invention, and can be realized not only in an integrated form, but also in a form of being divided into a plurality of parts and then assembled according to needs in order to improve the efficiency of the assembly process, etc. According to an embodiment, the housing 800 used as a shield can can be combined with the housing 500.

[0031] The lens carrier 300 and / or the intermediate guide 400 of the present invention, as a structure for realizing OIS, corresponds to a mover that moves in a direction perpendicular to the optical axis direction (one or more directions of the X-axis direction and the Y-axis direction).

[0032] The axes shown in the drawings, the terms representing the axes, and the terms such as upper, lower, front, rear, vertical, and horizontal described with reference to the axes are merely used to indicate relative references for describing the embodiments of the present invention, and are not used to specify a direction or position of a certain party from an absolute reference. Of course, they may also be relatively different depending on the position of the object being the subject or the position of the observer, the viewing direction, etc.

[0033] In the following description of the present invention, the directional axis corresponding to the path of the light (light) of the subject incident on the lens 30, that is, the directional axis corresponding to the vertical length direction of the lens is defined as the optical axis (Z axis), and two axes on the plane (horizontal plane) perpendicular to the optical axis (Z axis) are defined as the X axis and the Y axis.

[0034] The carrier 100 of the present invention is configured such that the housing 500 moves forward and backward relative to the stator in the direction of the image sensor 2000 , and as shown in the figure, a reflector 200 for reflecting or refracting light of a subject is mounted in the middle portion.

[0035] like Figure 3 As shown in FIG. 1 , the light of the subject incident along the optical axis (Z axis) is refracted toward the image sensor 2000 by the reflector 200 mounted on the carrier 100 and introduced into the image sensor 2000 . Figure 3 , the direction indicated by Z1 is the path direction of the light reflected by the reflector 200 and incident on the image sensor 2000 .

[0036] For the sake of efficiency, Figure 3 The Z axis shown, that is, the direction axis of the light of the subject incident on the reflector 200 is defined as the first optical axis. Figure 3 The Z1 axis shown in FIG. 1 , that is, the direction axis of the light reflected from the reflector 200 and incident on the image sensor 2000 is defined as a second optical axis.

[0037] Preferably, if Figure 3 As exemplified in FIG. 1 and FIG. 2 , the image sensor 2000 is disposed in an inclined state with a predetermined angle, rather than being disposed in a vertical state with respect to a horizontal plane.

[0038] With such a configuration, even if the reflector 200 is close to or away from the image sensor 2000 , the optical center can be more effectively maintained, and a phenomenon in which light shift of the subject due to the reflector 200 can be suppressed.

[0039] If the carrier 100 of the present invention moves in a direction (the Y-axis direction in the figure) toward or away from the image sensor 2000, the reflector 200 is fixed to the carrier 100 and thus physically moves together with the carrier 100. If the reflector 200 moves in this way, the length of the light path of the light of the subject incident on the image sensor 2000 changes, thereby achieving AF.

[0040] The driving unit of the present invention is a structure for moving the carrier 100. As long as the carrier 100 can be moved in a specific direction by using an external control signal or a detected signal system, it can be realized by various application examples such as shape memory alloy (Shape Memory Alloy, SMA), piezoelectric elements, micro electro mechanical system (Micro Electro Mechanical System, MEMS), etc. This is self-evident.

[0041] Just in consideration of efficiency in device miniaturization, power consumption, noise suppression, space utilization, linear movement characteristics, precise control, etc., the driver is preferably implemented as a configuration using electromagnetic force generated between a magnet and a coil.

[0042] Specifically, the driver according to a preferred embodiment of the present invention may include an AF magnet MA and an AF coil CA, wherein the AF magnet MA is arranged in one of a carrier 100 serving as a mover and a shell 500 serving as a relative stator, and the AF coil CA is arranged in a structure in the carrier 100 and the shell 500 that does not have the AF magnet MA.

[0043] In order to more simply realize the electrical wiring relationship and the physical coupling structure, etc., preferably, the AF magnet MA is arranged on the carrier 100 as the mover, and the AF coil CA is arranged on the housing 500 as the relative stator.

[0044] As shown in the drawings, the AF coil CA is preferably configured to be bendable or have a three-dimensional shape and is mounted on a first circuit substrate 700 that is fully or partially exposed to the outside to enable effective interfacing with an external module, a power supply unit, and an external device.

[0045] If electric power of appropriate magnitude and direction is applied to the AF coil CA through the control of a driver (not shown), a magnetic force (electromagnetic force) is generated between the AF coil CA and the AF magnet MA provided on the carrier 100. The carrier 100 uses the generated magnetic force to move the housing 500 forward and backward in the direction of the image sensor 2000 relative to the stator.

[0046] According to an embodiment, a sensing sensor may be further included as a component for such movement control. In this case, if the sensing sensor senses the position of the carrier 100 (specifically, the AF magnet MA or the sensing magnet provided on the carrier 100) and transmits a corresponding signal to the driver, the driver performs feedback control by applying electric power of a corresponding magnitude and direction to the AF coil CA.

[0047] The sensing sensor may be implemented by a Hall sensor, which utilizes the Hall effect to sense changes in the magnetic field strength and direction of a magnet in a sensing area and outputs an electrical signal corresponding thereto.

[0048] If the actuator 1000 according to the present invention is an actuator that only implements AF, the lens carrier 300 illustrated in the drawings may be fixedly coupled to the carrier 100 . It goes without saying that, depending on the embodiment, the lens 30 may also be directly mounted on the carrier 100 .

[0049] At least one of the housing 500 and the carrier 100 may include guide rails 510A, 510B, 110A, 110B, and at least one AF ball BA may be arranged in the guide rails 510A, 510B, 110A, 110B.

[0050] In order to more clearly realize the movement directionality, preferably, the above-mentioned AF ball BA is configured in a form in which a part of it is accommodated in the guide rails 510A, 510B, 110A, and 110B.

[0051] When the AF ball BA is set in this way, the minimized friction caused by the rolling, moving, rotation, and point contact with the opposing object of the ball can have the following advantages: the mover (carrier 100) can move more flexibly, which can not only reduce noise and minimize the driving force, but also improve the driving accuracy, etc.

[0052] According to an embodiment, the housing 500 of the present invention may include a sub-yoke 560 made of a magnetic material, and the sub-yoke 560 generates an attractive force with a sub-magnet MS or the like provided on the carrier 100 .

[0053] In such a configuration, the carrier 100 with the AF ball BA clamped therein is tightly attached in the direction of the shell 500 (the Z-axis direction in the drawing) by the gravitational force and attractive force between the sub-magnet MS and the sub-yoke 560, so that not only the physical contact between the AF ball BA and the carrier 100 is maintained, but also the physical contact between the AF ball BA and the shell 500 is maintained.

[0054] Figure 4 and Figure 5 1 is a diagram illustrating a guide rail etc. according to the present invention, Figure 6 FIG. 1 is a diagram for explaining the light path that changes according to the posture of the carrier. Figures 4 to 6 An embodiment of the present invention in which the posture of the reflector 200 changes due to AF driving will be described in detail.

[0055] As described above, the guide rail of the present invention may be provided in one or more of the housing 500 and the carrier 100 .

[0056] When the guide rail is provided only on one side of the housing 500 and the carrier 100 , one or more pockets may be provided on the other side, the pockets accommodating the AF ball BA and preventing the AF ball BA from escaping to the outside.

[0057] In the following description, the technical content of the present invention is described based on an embodiment in which both the housing 500 and the carrier 100 are provided with guide rails.

[0058] In the following description, the positions of the guide rails are distinguished, and the guide rails included in the housing 500 are denoted by reference numeral 510 ( 510A, 510B), and the guide rails included in the carrier 100 are denoted by reference numeral 110 ( 110A, 110B).

[0059] In addition, for the purpose of stably supporting and guiding the carrier 100, as illustrated in the accompanying drawings, the guide rails of the present invention may include: first guide rails 510A, 110A, located at a relatively distant position based on the spacing distance from the image sensor 2000; and second guide rails 510B, 110B, located at a closer position.

[0060] As shown in the accompanying drawings, one or more of the guide rails 510A, 110A, 510B, 110B may be provided in plurality. Preferably, all or a portion of the guide rails 510A, 110A, 510B, 110B are constructed in a shape having a groove or a corresponding structure extending in the direction in which the carrier 100 moves (the Y-axis direction).

[0061] As illustrated in the drawings, the first guide rails 510A and 110A according to an embodiment of the present invention are configured to have a shape in which the height of the first guide rails 510A and 110A decreases toward the image sensor 2000 .

[0062] That is, the first guide rails 510A and 110A may be configured to include a member having a shape with a lower height near the image sensor 2000 and a higher height far from the image sensor 2000. Such a shape with a height change may be implemented as a slope such as a straight line or a curved line.

[0063] like Figure 6 As shown, according to an embodiment in which the first guide rail 510A, 110A includes a shape whose height decreases toward the image sensor 2000 (hereinafter referred to as the "first inclined shape"), when the carrier 100 moves toward a direction approaching the image sensor 2000 (the +Y-axis direction in the drawing), the rear of the carrier 100 becomes relatively lower.

[0064] On the contrary, when the carrier 100 moves in a direction away from the image sensor 2000 (the −Y axis direction in the drawing), the rear of the carrier 100 becomes relatively higher.

[0065] According to an embodiment, the angle or position of the first inclined shape is preferably designed so that the carrier 100 is horizontal when the carrier 100 is located at a reference position (default position) that can be designated as the center of the AF driving area.

[0066] The first inclined shape may be implemented in the entire first guide rail 510A, 110A, or may be implemented in a portion of the first guide rail 510A, 110A. In addition, the inclination angle or curvature radius of the first inclined shape may be set in consideration of the optical characteristics of the reflector 200, the characteristics of the image sensor 2000, the spacing distance between the reflector 200 and the image sensor 2000, the total driving distance of the AF, and the like.

[0067] When the posture of the carrier 100 is tilted according to the direction and degree of movement of the carrier 100 , the reflector 200 provided on the carrier 100 may also be tilted at the same angle.

[0068] Specifically, when the reflector 200 moves in a direction away from the image sensor 2000, the angle of the reflective surface of the reflector 200 toward the image sensor 2000 (hereinafter referred to as the "reflection angle") which has a functional relationship with the distance away is tilted downward accordingly. Due to such a change in the reflection angle, the light incident from the reflector 200 to the image sensor 2000 moves downward.

[0069] If the reflector moves backward along a straight line direction (linearly) corresponding to the horizontal plane without such a tilt or angle change, the point where the light of the subject is incident on the reflector rises (Z-axis direction) due to the parallel movement, so the light reflected from the reflector and incident on the image sensor is also shifted in the upward direction (Z-axis direction).

[0070] However, according to the embodiment of the present invention, when the reflector 200 moves away from the image sensor 2000, the reflection angle of the reflector 200 tilts downward according to the moving distance of the reflector 200, thereby fundamentally solving the existing problem of light deviation of the subject.

[0071] In a corresponding viewpoint, when the carrier 100 moves in a direction approaching the image sensor 2000 , the reflection angle of the reflector 200 increases upward according to the distance the reflector 200 moves, so that the light incident on the image sensor 2000 also moves upward.

[0072] On the other hand, preferably, when the horizontal plane reference angle of the image sensor 2000 provided in the application device, etc. is A° so that the light of the subject can be introduced into the image sensor 2000 in the vertical direction, the reflector 200 is arranged on the carrier 100 in such a manner that the angle of its reflecting surface is 0.5A° with the horizontal plane as a reference.

[0073] like Figure 3 and Figure 6As illustrated, the reflection surface of the reflector 200 is aligned with the image sensor 2000 , specifically, the incident surface of the image sensor 2000 , at different angles with reference to the second optical axis Z1 or the like.

[0074] As described above, when the reflector 200 moves toward or away from the image sensor 2000 by physical movement of the carrier 100 , the degree of angular misalignment between the reflection surface of the reflector 200 and the incident surface of the image sensor 2000 increases or decreases.

[0075] The angle misalignment changes with the moving direction and moving distance of the reflector 200, so that even if the reflector 200 moves, the light of the subject reflected from the reflector 200 always enters the specified position of the image sensor 2000, thereby fundamentally solving the phenomenon of light deviation of the subject.

[0076] In addition, it is self-evident that the reflector 200 of the present invention may be one of a mirror and a prism or a combination thereof, and may also be implemented by various elements capable of changing the optical path of the subject introduced from the outside toward the image sensor 2000. It is self-evident that the reflector 200 described above may be implemented in the form of a component together with a frame for physically supporting the reflector, etc. according to the embodiment.

[0077] The above-mentioned embodiment is an embodiment in which the first guide rail 510A of the shell 500 and the first guide rail 110A of the carrier 100 both include a first inclined shape. However, it goes without saying that the technical idea of ​​the present invention can be realized even if only one of the first guide rail 510A of the shell 500 and the first guide rail 110A of the carrier 100 includes the first inclined shape and the other is formed by a straight shape or a bag-like shape.

[0078] Figure 7 1 is a diagram showing a first guide rail 510A, 110A and a second guide rail 510B, 110B according to another embodiment of the present invention.

[0079] As described above, in the actuator 1000 according to the present invention, when the carrier 100 approaches or moves away from the image sensor 2000, the carrier 100, specifically the reflector 200 arranged on the carrier 100, can be tilted accordingly, so that the reflection angle of the reflection surface of the reflector 200 toward the image sensor 2000 changes dynamically and naturally.

[0080] The above-described embodiment corresponds to an embodiment in which the first guide rails 510A and 10A include an inclined portion to incline the posture of the reflector 200 .

[0081] like Figure 7 As exemplified above, the technical idea of ​​the present invention can also be realized by the second guide rails 510B and 110B provided at the position close to the image sensor 2000 in the guide rail.

[0082] For this reason, Figure 7 As exemplified in (a), the second guide rails 510B and 110B may include a shape in which the height increases toward the image sensor 2000 (hereinafter referred to as a “second inclined shape”).

[0083] If the second guide rails 510B and 110B have the second inclined shape, when the carrier 100 moves toward the direction approaching the image sensor 2000 (the +Y axis direction in the drawing), the front of the carrier 100 becomes relatively higher and the rear of the carrier 100 becomes relatively lower.

[0084] On the contrary, when the carrier 100 moves in a direction away from the image sensor 2000 (the −Y axis direction in the drawing), the front of the carrier 100 becomes relatively lower and the rear of the carrier 100 becomes relatively higher.

[0085] Therefore, as described above, according to the embodiments of the present invention, the tilt of the reflector 200 can be guided to change in a functional manner according to the moving direction and the moving degree of the carrier 100 .

[0086] According to the implementation mode, Figure 7 As shown in (b), the second guide rails 510B and 110B provided at a position close to the image sensor 2000 may include the second inclined shape, and the first guide rails 510A and 110A provided at a relatively far position may include the first inclined shape.

[0087] In such a configuration, angle tilt is achieved in combination in front and rear with respect to the image sensor 2000, and thus, compared with the above-described embodiment, the inclination of the guide rails 510A, 510B, 110A, 110B can be relatively reduced, thereby reducing the height (Z-axis direction) of the actuator 1000, thereby improving the space utilization of the actuator 1000.

[0088] Figure 8 and Fig. 9 : is a diagram showing a detailed structure of the present invention for realizing OIS.

[0089] The OIS carrier of the present invention carrying the lens 30 is accommodated in the carrier 100 and moves in two directions orthogonal to each other based on a horizontal plane (XY plane), and may include a lens carrier 300 and an intermediate guide 400 according to an embodiment.

[0090] The lens carrier 300 carrying the lens 30 is equivalent to a mover that moves in a first direction (Y-axis direction) and a second direction (X-axis direction) perpendicular to the optical axis (Z-axis). A first magnet M1 facing the first coil C1 and a second magnet M2 facing the second coil C2 are provided in the lens carrier 300.

[0091] The first OIS ball B1 may be disposed between the lens carrier 300 and the intermediate guide 400. Specifically, the first OIS ball B1 may be disposed between the first track 310 of the lens carrier 300 and the first track 410 of the intermediate guide 400.

[0092] The drawings show an embodiment in which both the lens carrier 300 and the intermediate guide 400 have the first rails 310 , 410 , but depending on the embodiment, only one of them may have the first rail.

[0093] As shown in the accompanying drawings, the first rails 310 and 410 may be formed by a groove extending in a first direction (Y-axis direction). Therefore, if a driving force is generated between the first coil C1 and the first magnet M1, the lens carrier 300 moves in the first direction through the physical guidance of the first OIS ball B1 and the first rails 310 and 410, and hand shake of the first direction component is corrected by this movement.

[0094] The second OIS ball B2 may be disposed between the second rail 420 of the intermediate guide 400 and the second rail 120 of the carrier 100. The second rails 420 and 120 have a shape extending in a second direction (X-axis direction) perpendicular to the first direction (Y-axis direction).

[0095] If a current of appropriate magnitude and direction is supplied to the second coil C2, a magnetic force (electromagnetic force) is generated between the second coil C2 and the second magnet M2. The generated magnetic force is used as a driving force, and the lens carrier 300 moves along the second direction through the physical guidance of the second OIS ball B2 and the second rails 420 and 120. This movement is used to correct hand shake of the second direction component.

[0096] The first rails 310 and 410 and the second rails 420 and 120 have shapes extending in directions orthogonal to each other and respectively accommodate the first OIS balls B1 and the second OIS balls B2 therebetween, thereby guiding movement in one direction and suppressing movement in another orthogonal direction.

[0097] Therefore, when a driving force is generated between the first coil C1 and the first magnet M1 , the lens carrier 300 moves in the Y-axis direction by being guided by the first rails 310 , 410 and the first OIS ball B1 , but the intermediate guide 400 does not move.

[0098] On the contrary, when a driving force (second direction) is generated between the second coil C2 and the second magnet M2 , the movement of the lens carrier 300 with the intermediate guide 400 as a relative stator is suppressed by the first rails 310 , 410 and the first OIS ball B1 .

[0099] Therefore, in the case where a driving force is generated between the second coil C2 and the second magnet M2, the lens carrier 300 moves in the second direction together with the intermediate guide 400 by physical guidance of the second rails 420, 120 and the second 2OIS ball B2.

[0100] The intermediate guide 400 of the present invention disposed between the carrier 100 and the lens carrier 300 has a second guide rail 420 on the upper surface and a first guide rail 410 on the lower surface, and serves as a relative stator for the movement of the lens 30 in the Y-axis direction, and serves as a mover in the relationship with the carrier 100 or the housing 500 as the relative stator for the movement of the lens 3 in the X-axis direction. According to an embodiment, the intermediate guide 400 may include an insert 430 for enhancing durability, etc.

[0101] The drawings show, as an example, a configuration in which the first coil C1 and the second coil C2 are disposed on the carrier 100 and the first magnet M1 and the second magnet M2 are disposed on the lower portion of the lens carrier 300 .

[0102] However, according to an embodiment, the first magnet and the second magnet M2 may be disposed on the side of the lens carrier 300 and the first coil C1 and the second coil C2 may be disposed on the side of the housing 500. In addition, of course, one of the first magnet M1 and the second magnet M2 may be disposed on the lens carrier 300 and the other may be disposed on the intermediate guide 400.

[0103] In the case where the actuator 1000 of the present invention includes an OIS carrier, the reflector 200 is configured to reflect the light of the subject that has passed through the lens 30 mounted on the lens carrier 300 toward the image sensor 2000 .

[0104] Similar to the first circuit substrate 700 , the first coil C1 and the second coil C2 may be implemented in a form of being mounted on a second circuit substrate 600 partially exposed to the outside.

[0105] The accompanying drawings illustrate an embodiment in which the lens carrier 300 and the intermediate guide 400 move along the X-axis and Y-axis directions, but it goes without saying that they can also be designed to move in two mutually orthogonal directions different from the X-axis and Y-axis illustrated in the accompanying drawings with the horizontal plane as the reference.

[0106] Although the present invention has been described above through limited embodiments and drawings, the present invention is not limited thereto, and it goes without saying that a person skilled in the art in the technical field to which the present invention belongs can make various modifications and variations within the scope of the technical idea of ​​the present invention and the claims described below.

[0107] In the above description of the present invention, modifiers such as first, second, etc. are merely tool concepts used to relatively distinguish components from each other, and therefore, lithotripsy is not a term used to indicate a specific order, priority, etc.

[0108] The drawings attached to the description of the present invention and the illustrations of its embodiments may be illustrated in a slightly exaggerated form in order to emphasize or highlight the technical content of the present invention, but it should be interpreted as a matter of course that various forms of modified application examples can be made at the level of ordinary technicians in the technical field to which the present invention belongs, taking into account the above-mentioned contents and matters shown in the drawings.

Claims

1. A camera actuator, characterized in that: include: A reflector that reflects light of a subject toward an image sensor disposed in an inclined state, wherein a reflection surface of the reflector has an inclination angle different from an inclination of the image sensor; a carrier provided with the reflector; A driving unit, configured to move the carrier forward and backward toward the image sensor; A housing, supporting the movement of the carrier; A guide rail, disposed in at least one of the housing and the carrier; and The balls are arranged on the guide rails.

2. The camera actuator according to claim 1, wherein: The guide rail includes an inclined portion that inclines the posture of the carrier when the carrier moves.

3. The camera actuator according to claim 1, wherein: The reflector is disposed on the carrier such that when the horizontal plane reference angle of the image sensor is A°, the angle of the reflection surface is 0.5A° with respect to the horizontal plane.

4. The camera actuator according to claim 2, wherein: The guide rail comprises: A first guide rail having a shape extending along a direction in which the carrier moves; and The second guide rail has a shape extending along the direction in which the carrier moves, and is disposed at a position closer to the image sensor than the first guide rail.

5. The camera actuator according to claim 4, wherein: The first guide rail includes a shape that becomes lower as it moves toward the image sensor.

6. The camera actuator according to claim 4 or 5, characterized in that: The second guide rail includes a shape that is higher in a direction toward the image sensor.

7. The camera actuator according to claim 1, wherein: It also includes an OIS carrier, in which a lens is mounted, moves along two directions orthogonal to each other based on a horizontal plane, and is accommodated in the carrier. The reflector reflects the light of the object that has passed through the lens toward the image sensor.

Images