Camera actuator and camera module comprising the same

Abstract

A camera module according to an embodiment of the present application includes a first housing including a fixed lens, a second housing coupled to the first housing, an actuator disposed within the second housing, a coil and a driving magnet for moving the actuator in an optical axis direction, a first guide magnet disposed at the actuator, and a second guide magnet disposed within the second housing and facing the first guide magnet.

Description

TECHNICAL FIELD

[0001] The disclosure relates to a camera actuator and a camera module including the same. BACKGROUND

[0002] A camera is a device that photographs a subject as a photo or a video, and is installed in a portable device, a drone, a vehicle, etc. To improve image quality, a camera module can have an image stabilization (IS) function that corrects or prevents image blur caused by user movement, an auto focus (AF) function that automatically adjusts the distance between an image sensor and a lens to align the focal length of the lens, and a zoom function that photographs a distant subject while increasing or decreasing the magnification of the distant subject through a zoom lens.

[0003] However, in a camera module that is miniaturized, there is a problem of a decrease in optical performance due to decentration and tilt. In addition, there is an increasing demand for protection of circuit elements from foreign matter intrusion, i.e., improvement in reliability. SUMMARY

[0004] TECHNICAL PROBLEM

[0005] The technical problem to be solved by the disclosure is to provide a camera actuator and a camera device in which optical performance is improved by coupling between one housing including a lens assembly movable along an optical axis and another housing having a fixed lens.

[0006] TECHNICAL SOLUTION

[0007] To solve the technical problem, a camera module according to an embodiment of the disclosure includes a first housing including a fixed lens, a second housing coupled to the first housing, an actuator disposed inside the second housing, a coil and a driving magnet configured to move the actuator in an optical axis direction, a first guide magnet disposed on the actuator, and a second guide magnet disposed inside the second housing and facing the first guide magnet.

[0008] A portion of the first guide magnet and a portion of the second guide magnet facing each other can have the same polarity.

[0009] A length of the first guide magnet in the optical axis direction can be less than a length of the second guide magnet in the optical axis direction.

[0010] The actuator can include a lens holder provided with a lens and a magnet holder provided with the driving magnet, and the driving magnet can include regions having different magnetic poles and arranged in the optical axis direction.

[0011] The first guide magnet can include a first-1 guide magnet disposed adjacent to a region of the driving magnet having an N pole and a first-2 guide magnet disposed adjacent to a region of the driving magnet having an S pole, the first-1 guide magnet can have an N pole, and the first-2 guide magnet can have an S pole.

[0012] The second guide magnet can include a second-1 guide magnet disposed to face the first-1 guide magnet and a second-2 guide magnet disposed to face the first-2 guide magnet.

[0013] An inner surface of the second housing can include a first guide portion and a second guide portion, the first guide portion and the second guide portion being provided with the second guide magnet, and the first guide portion and the second guide portion being spaced apart from each other, and the coil and the driving magnet can be disposed between the first guide portion and the second guide portion.

[0014] The second guide magnet can include a second-1 guide magnet and a second-2 guide magnet disposed in the first guide portion, spaced apart from each other, and having different magnetic poles from each other, and the second guide magnet can include a second-3 guide magnet and a second-4 guide magnet disposed in the second guide portion, spaced apart from each other, and having different magnetic poles from each other.

[0015] The camera module can include a substrate coupled to an outer surface of the second housing, and the coil can be disposed on the substrate and electrically connected to the substrate.

[0016] A first stop portion can be disposed on one surface of the first housing facing the second housing, a second stop portion can be disposed on an inner surface of a side opposite to a side of the second housing on which the first housing is disposed, and a maximum stroke length of the actuator can be equal to or less than a distance between the first stop portion and the second stop portion in the optical axis direction.

[0017] To solve the technical problem, a camera module according to an embodiment includes a PID controller configured to perform a PID control operation based on an error value, a first value as a preset proportional gain, a second value as an integral gain, and a third value as a differential gain, the error value being a difference between a target position and a current position of a lens; a parameter generator configured to adjust at least one of the proportional gain, the integral gain, and the differential gain according to a control interval of the lens; and a controller configured to generate a driving signal using a control value generated by the PID controller.

[0018] The parameter generator can adjust at least one of the first value to the third value according to a logarithmic scale according to the error value.

[0019] During an initial movement operation of the lens, the parameter generator can increase at least one of the first value and the second value.

[0020] After the lens reaches the target position, the parameter generator can reduce at least one of the first and second values.

[0021] The control range of the lens may include a first range from the initial position to the target position, and a second range after the lens movement operation ends in the first range. When the current position of the lens corresponds to the first range, the parameter generator may increase at least one of the first value and the second value.

[0022] When the current position of the lens corresponds to the second interval, the parameter generator can decrease at least one of the first and second values.

[0023] To address this technical problem, a camera module according to another embodiment of this disclosure includes: a PID controller configured to perform PID control operations based on an error value, a first value as a preset proportional gain, a second value as an integral gain, and a third value as a derivative gain, wherein the error value is the difference between the target position and the current position of the lens; a parameter generator configured to adjust at least one of the proportional gain, integral gain, and derivative gain according to the error value; and a controller configured to generate a drive signal using the control value generated by the PID controller.

[0024] When the error value is greater than a preset first error value, the parameter generator can increase at least one of the first value and the second value, and when the error value is less than the first error value, the parameter generator can decrease at least one of the first value and the second value.

[0025] The parameter generator can adjust at least one of the first to third values ​​on a logarithmic scale based on the error value.

[0026] Beneficial effects

[0027] According to an embodiment, a camera actuator and camera device with improved optical performance can be realized by connecting a housing including a lens assembly movable along the optical axis to another housing having a fixed lens.

[0028] Furthermore, by using an actuator with a magnetic levitation structure, the effects of dynamic tilt caused by the verticality and flatness of the injection-molded parts can be minimized, and since no guide ball is used, dents caused by impacts are not generated.

[0029] Furthermore, camera actuators and camera devices can achieve improved reliability of components in optical alignment.

[0030] In addition, it can protect circuit components from foreign objects, thereby improving the reliability of camera actuators and camera devices.

[0031] In addition, a protrusion or the like can be added to the housing to further improve the flatness of the guide portion, thereby realizing a camera actuator and a camera device with minimized eccentricity and inclination.

[0032] In addition, a camera actuator suitable for a super-thin, super-small, high-resolution camera can be realized.

[0033] In addition, the moving speed of the lens to the target position can be increased according to the control interval, and the control operation can be stably ended after the lens reaches the target position. Therefore, magnification change and focus change can be performed more quickly than ever, thereby improving optical performance. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a perspective view of a camera module according to the present embodiment.

[0035] Figure 2 is an exploded perspective view of a camera module according to the present embodiment.

[0036] Figure 3 is a cross-sectional view of a camera module according to the present embodiment.

[0037] Figure 4 is a perspective view of a first housing according to the present embodiment.

[0038] Figure 5 is a perspective view of a second housing according to the present embodiment.

[0039] Figure 6 is a perspective view of a second housing according to the present embodiment, viewed from another angle.

[0040] Figure 7 is a perspective view of an actuator according to the present embodiment.

[0041] Figure 8 is a perspective view of a first actuator, a first coil, and a first position sensor according to the present embodiment.

[0042] Figure 9 is a perspective view of a second actuator, a second coil, and a second position sensor according to the present embodiment.

[0043] Figure 10 is another cross-sectional view of a camera module according to the present embodiment.

[0044] Figure 11 and Figure 12 is a view for explaining an optical axis stroke of an actuator according to the present embodiment.

[0045] Figure 13 is still another cross-sectional view of a camera module according to the present embodiment.

[0046] Figure 14 is a block diagram of a camera module according to the present embodiment.

[0047] Figure 15 is a block diagram of a camera module according to the present embodiment.

[0048] Figures 16 to 18 is a view for explaining a control operation of a camera module according to the present embodiment.

[0049] Figure 19 is a perspective view of a mobile terminal to which a camera module according to the present embodiment is applied.

[0050] Figure 20 is a perspective view of a vehicle to which a camera module according to the present embodiment is applied. DETAILED DESCRIPTION

[0051] Hereinafter, preferred embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

[0052] However, the technical idea of the present disclosure is not limited to some embodiments described herein, but can be implemented in various different forms, and one or more components of the embodiments can be selectively combined or replaced within the scope of the technical idea of the present disclosure.

[0053] In addition, unless explicitly and specifically defined and described otherwise, the terms used in the present embodiment (including technical terms and scientific terms) can be interpreted as the meanings commonly understood by those skilled in the art to which the present embodiment pertains, and commonly used terms (for example, terms defined in a dictionary) can be interpreted in consideration of the contextual meaning in the relevant art.

[0054] In addition, the terms used in the present embodiment are intended to describe the embodiments, and are not intended to limit the present disclosure.

[0055] In the present specification, the singular form can include the plural form unless specifically stated otherwise in the context of the phrase, and when reciting "at least one of (or one or more of) A, B, and C," at least one of all combinations of A, B, and C can be included.

[0056] In addition, in describing the components of the present embodiment, the terms first, second, A, B, (a), (b), and the like can be used. These terms are used only to distinguish one component from another component, and the nature, order, sequence, and the like of the corresponding components are not limited by these terms.

[0057] Moreover, when one member is described as being "connected", "coupled" or "engaged" with another member, the one member can be directly connected, coupled or engaged with the other member, or can be connected, coupled or engaged with the other member with a further member interposed therebetween.

[0058] Moreover, when one member is described as being formed or disposed "on (above)" or "under" another member, "on (above)" or "under" can include not only a case where the two members are in direct contact with each other, but also a case where one or more additional members are formed or disposed between the two members. Furthermore, when expressed as "on (above)" or "under", the expression can include not only an upward direction with respect to one member, but also a downward direction with respect to the one member.

[0059] Figure 1 is a perspective view of a camera module according to the present embodiment, Figure 2 is an exploded perspective view of a camera module according to the present embodiment, Figure 3 is a cross-sectional view of a camera module according to the present embodiment, Figure 4 is a perspective view of a first housing according to the present embodiment, Figure 5 is a perspective view of a second housing according to the present embodiment, Figure 6 is a perspective view of a second housing according to the present embodiment, viewed from another angle, Figure 7 is a perspective view of an actuator according to the present embodiment, Figure 8 is a perspective view of a first actuator, a first coil and a first position sensor according to the present embodiment, Figure 9 is a perspective view of a second actuator, a second coil and a second position sensor according to the present embodiment, Figure 10 is another cross-sectional view of a camera module according to the present embodiment, Figure 11 and Figure 12 is a view for explaining an optical axis stroke of an actuator according to the present embodiment, and Figure 13 is still another cross-sectional view of a camera module according to the present embodiment.

[0060] A camera module 1000 according to the present embodiment can include a first housing 1100, a second housing 1200, a lens unit 100, a first actuator 200 and a second actuator 300. The camera module 1000 can include stops ST1 and ST2, a yoke YK, a shield can (not shown), an elastic portion (not shown) and an adhesive member (not shown).

[0061] A shield can (not shown) can be located in one area of the camera module 1000, for example, at the outermost side thereof, to surround components described below. The shield can block or reduce electromagnetic waves generated from the outside. Accordingly, the occurrence of malfunctions in the first actuator 200 and the second actuator 300 can be reduced.

[0062] The camera module 1000 can be a component separate from an image sensor and a base member described below, or can be a concept including the image sensor and the base member. Hereinafter, a main substrate part or a circuit board separate from the camera module 1000 will be described as including the image sensor and the base member.

[0063] The lens unit 101 to 104 (hereinafter, 100) can be located in a shield can (not shown). The lens unit 100 can move in a Z-axis direction or an optical axis direction. Accordingly, an AF function and a zoom function can be performed. The lens unit 100 can be disposed in the first housing 1100 and the second housing 1200. Accordingly, at least a part of the lens unit 100 can move in the optical axis direction or the Z-axis direction in the first housing 1100 and the second housing 1200.

[0064] The lens unit 100 can include a first lens group 101 to a third lens group 103 and a rear optical part 104.

[0065] Each of the first lens group 101 to the third lens group 103 can include at least one lens. The first lens group 101, the second lens group 102, and the third lens group 103 can be disposed in order along the optical axis direction. The rear optical part 104 can be disposed rearward of the third lens group 103. The rear optical part 104 can include a lens made of glass or the like.

[0066] The first lens group 101 can be coupled to the first housing 1100 and fixed to the first housing 1100. The first lens group 101 can not move in the optical axis direction. The second lens group 102 can be coupled to the first actuator 200 and move in the optical axis direction. Magnification adjustment can be performed by the movement of the first actuator 200 and the second lens group 102. The third lens group 103 can be coupled to the second actuator 300 and move in the optical axis direction. Focus adjustment or auto focus can be performed by the movement of the third lens group 103. However, the number of lens groups is not limited thereto, and an additional lens group can be further provided.

[0067] The camera module 1000 can include a first housing 1100 and a second housing 1200. The first housing 1100 can be coupled to the first lens group 101. The first housing 1100 can be positioned in front of the second housing 1200. The second housing 1200 can be positioned behind the first housing 1100. The second lens group 102 and the third lens group 103, and the rear optical portion 104 can be disposed in the second housing 1200.

[0068] The first housing 1100 of the camera module 1000 can include a fixed lens. The second housing 1200 can be disposed side by side with the first housing 1100 in the optical axis direction or Z-axis direction. A moving assembly that is movable in the optical axis direction can be disposed in the second housing 1200, and a lens that is not movable in the optical axis direction (i.e., a fixed lens) can be disposed in the first housing 1100. The first housing 1100 and the second housing 1200 can be coupled to each other by a coupling member BM disposed between the first housing 1100 and the second housing 1200.

[0069] The first housing 1100 can include a holder portion HP and a wing portion WP extending outward from the holder portion HP. The wing portion WP can be disposed around a portion of an outer surface of the holder portion HP. The holder portion HP and the wing portion WP can have a one-piece structure or a split structure. The length of the holder portion HP in the X-axis direction or the Y-axis direction can be less than the length of the wing portion WP in the X-axis direction or the Y-axis direction.

[0070] The holder portion HP can include a first holder portion HP1 disposed above the wing portion WP and a second holder portion HP2 disposed below the wing portion WP. The first holder portion HP1, the wing portion WP, and the second holder portion HP2 can be disposed in order in the optical axis direction. The length LT1 of the first holder portion HP1 in the optical axis direction can be less than the length LT2 of the second holder portion HP2 in the optical axis direction. With such a configuration, the coupling force between the first housing 1100 and the second housing 1200 can be improved, and optical alignment can be easily performed by tilting the first housing 1100. Accordingly, the resolution of the camera module can be improved.

[0071] The wing portion WP can include one surface and another surface. The one surface and the other surface of the wing portion WP can be disposed in order in the optical axis direction. The other surface of the wing portion WP can be disposed to face an inner surface of the second housing 1200. The other surface of the wing portion WP can be spaced apart from the second housing 1200. At least a portion of the other surface of the wing portion WP can be spaced apart from the second housing 1200.

[0072] The first stop portions ST1a and ST1b can be provided on the wing portion WP. The 1-1 stop ST1a and the 1-2 stop ST1b can be symmetrically provided on the other surface of the wing portion WP with respect to the optical axis direction. The 1-1 stop ST1a can be provided to face the first magnet holder 220 of the first actuator 200. The 1-2 stop ST1b can be provided to face the second magnet holder 320 of the second actuator 300. The first stop portions ST1a and ST1b can mitigate contact with and impact on the first housing 1100 when the first actuator 200 and the second actuator 300 are moved along the optical axis direction.

[0073] The second housing 1200 can include a side groove in a region adjacent to the first housing 1100. Accordingly, even when the first housing 1100 is tilted with respect to the optical axis to perform optical alignment, contact with the second housing 1200 can be inhibited. Thereby, a movement range for optical axis alignment or the like can be easily secured, and the reliability of the camera module 1000 can be improved.

[0074] The first actuator 200 and the second actuator 300 can be seated within the second housing 1200, respectively. The first actuator 200 and the second actuator 300 can be referred to as a moving assembly. The first actuator 200 and the second actuator 300 can be referred to as a lens assembly. In the first actuator 200, the first magnet holder 220 provided with the first guide magnet M1 can be provided to face the first side portion. In the second actuator 300, the second magnet holder 320 provided with the third guide magnet M3 can be provided to face the second side portion. The first actuator 200 and the second actuator 300 can be provided to overlap each other in the optical axis direction. The first actuator 200 and the second actuator 300 can be provided to overlap each other in the Y-axis direction perpendicular to the optical axis direction.

[0075] The first actuator 200 and the second actuator 300 can be spaced apart from each other in the optical axis direction (i.e., the Z-axis direction). The first actuator 200 and the second actuator 300 can be moved in the optical axis direction (i.e., the Z-axis direction) by a driving portion including a driving magnet and a coil. For example, an auto focus function or a zoom function can be performed by the movement of the first actuator 200 and the second actuator 300.

[0076] The moving assembly can be coupled to an elastic portion (not shown) at its upper end and rear end. Accordingly, the moving assembly can be supported by the elastic portion (not shown) when it is moved in the Z-axis direction. That is, the moving assembly can be held in the Z-axis direction while its position is maintained. The elastic portion (not shown) can be made of various elastic elements such as a leaf spring or the like.

[0077] The first actuator 200 can include a first lens holder 210 holding the second lens group 102 and coupled to the second lens group 102. The first lens holder 210 can be coupled to the second lens group 102. Also, the first lens holder 210 can include a first lens hole LH1 for accommodating the second lens group 102. The second lens group 102 including at least one lens can be disposed in the first lens hole LH1. An area in which the second lens group 102 is seated in the first actuator 200 can be located at a front end of the first actuator 200.

[0078] The first actuator 200 can include a first magnet holder 220 disposed outside the first lens holder 210. The first driving magnet 401 can be disposed on the first magnet holder 220. The first magnet holder 220 can include a protrusion 221 configured to guide and fix a position of the first driving magnet 401. The protrusion 221 can protrude from the first magnet holder 220 in the Y-axis direction. The protrusion 221 can be formed to contact both sides of the first driving magnet 401. The first driving magnet 401 can be formed as a single magnet including areas having different magnetic poles. Alternatively, the first driving magnet 401 can include magnets having different magnetic poles and spaced apart from each other.

[0079] The first guide magnet M1 can be disposed on the first magnet holder 220 around the first driving magnet 401. The first guide magnet M1 can be disposed symmetrically with respect to the first driving magnet 401 in the X-axis direction. The first guide magnet M1 can be disposed to be spaced apart in the optical axis direction. The first guide magnet M1 can include a 1-1 guide magnet M11 and a 1-2 guide magnet M12 disposed above the first driving magnet 401 and spaced apart from each other. The first guide magnet M1 can include a 1-3 guide magnet M13 and a 1-4 guide magnet M14 disposed below the first driving magnet 401 and spaced apart from each other. A portion of the first guide magnet M1 and a portion of the second guide magnet M2 facing each other can have the same polarity. The first guide magnet M1 can guide movement of the first actuator 200 in the optical axis direction by repulsive force between the first guide magnet M1 and the second guide magnet M2.

[0080] The second actuator 300 can include a second lens holder 310 holding the third lens group 103 and coupled to the third lens group 103. The second lens holder 310 can include a second lens hole LH2 for accommodating the third lens group 103. The third lens group 103 including at least one lens can be disposed in the second lens hole LH2. An area in which the third lens group 103 is seated in the second actuator 300 can be located at a rear end of the second actuator 300.

[0081] The second actuator 300 can include a second magnet holder 320 disposed outside the second lens holder 310. A second driving magnet 501 can be disposed on the second magnet holder 320. The second magnet holder 320 can include a protrusion 321 configured to guide and fix a position of the second driving magnet 501. The protrusion 321 can protrude from the second magnet holder 320 in the Y-axis direction. The protrusion 321 can be formed to contact both sides of the second driving magnet 501. The second driving magnet 501 can be formed as a single magnet including regions having different magnetic poles. Alternatively, the second driving magnet 501 can include magnets having different magnetic poles and spaced apart from each other.

[0082] A third guide magnet M3 can be disposed on the second magnet holder 320 around the second driving magnet 501. The third guide magnet M3 can be disposed symmetrically with respect to the second driving magnet 501 in the X-axis direction. The third guide magnet M3 can be disposed to be spaced apart in the optical axis direction. The third guide magnet M3 can include a 3-1 guide magnet M31 and a 3-2 guide magnet M32 disposed above the second driving magnet 501 and spaced apart from each other. The third guide magnet M3 can include a 3-3 guide magnet M33 and a 3-4 guide magnet M34 disposed below the second driving magnet 501 and spaced apart from each other. A portion of the third guide magnet M3 and a portion of the fourth guide magnet M4 facing each other can have the same polarity. The third guide magnet M3 can guide movement of the second actuator 300 in the optical axis direction by repulsive force between the third guide magnet M3 and the fourth guide magnet M4.

[0083] A hole can be formed in a side portion of the second housing 1200. The first coil 402 and the second coil 502 can be disposed in the hole. The second housing 1200 can include a first side portion and a second side portion. The first side portion and the second side portion can be disposed corresponding to each other. The first side portion and the second side portion can be disposed symmetrically with respect to the optical axis direction.

[0084] The first coil 402 can be disposed on the first side portion of the second housing 1200. The first coil 402 can be disposed to face the first driving magnet 401. The first substrate 404 can be disposed on an outer surface of the first side portion. The first coil 402 can be electrically connected to the first substrate 404. The first coil 402 can receive a current or the like through the first substrate 404. The first position sensor 403 can be disposed inside the first coil 402 having a ring shape. The first position sensor 403 can be electrically connected to the first substrate 404. The first position sensor 403 can sense a change in magnetic flux of the first driving magnet 401, and thus position sensing between the first driving magnet 401 and the first position sensor 403 can be performed.

[0085] The second coil 502 can be disposed on the second side of the second housing 1200. The second coil 502 can be disposed to face the second driving magnet 501. The second substrate 504 can be disposed on the outer surface of the second side. The second coil 502 can be electrically connected to the second substrate 504. The second coil 502 can receive a current or the like through the second substrate 504. The second position sensor 503 can be disposed inside the second coil 502 having a ring shape. The second position sensor 503 can be electrically connected to the second substrate 504. The second position sensor 503 can sense a change in magnetic flux of the second driving magnet 501, and thus can perform position sensing between the second driving magnet 501 and the second position sensor 503.

[0086] The yoke portion YK can be disposed outside the second housing 1200. The yoke portion YK can be disposed outside the first coil 402 and the second coil 502. The yoke portion YK can include a first yoke YK1 and a second yoke YK2. The first yoke YK1 and the second yoke YK2 can be disposed to face each other. The first yoke YK1 and the second yoke YK2 can be disposed to correspond to each other with respect to the optical axis.

[0087] The first yoke YK1 can be disposed adjacent to the first coil 402. The second yoke YK2 can be disposed adjacent to the second coil 502. The first coil 402 and the second coil 502 can be located inside the first yoke YK1 and the second yoke YK2. The first yoke YK1, the first coil 402, the second coil 502, and the second yoke YK2 can be sequentially disposed in one direction, for example, the second direction. The first yoke YK1 can generate an attractive force with the first driving magnet 401. The second yoke YK2 can generate an attractive force with the second driving magnet 501. Accordingly, the postures of the first actuator 200 and the second actuator 300 can be maintained.

[0088] The thicknesses of the first yoke YK1 and the second yoke YK2 can vary in some regions. Through such a configuration, it is possible to suppress an influence on another magnet or coil by a magnetic force or the like generated by the first driving magnet 401 and the second driving magnet 501 or the first coil 402 and the second coil 502. The first yoke YK1 can suppress a magnetic force generated by the first driving magnet 401 from being applied to the second driving magnet 501 and the second coil 502.

[0089] The first guide portion GG1a and the second guide portion GG1b can be located on the inner surface of the first side portion of the second housing 1200. The first guide portion GG1a and the second guide portion GG1b can be symmetrically disposed above and below the side hole of the second housing 1200. The first guide portion GG1a and the second guide portion GG1b can face the first guide magnet M1 of the first actuator 200. The first guide portion GG1a and the second guide portion GG1b can be spaced apart from each other in the X-axis direction. The first driving magnet 401 and the first coil 402 can be disposed between the first guide portion GG1a and the second guide portion GG1b.

[0090] The second guide magnet M2 can be disposed at the first guide portion GG1a and the second guide portion GG1b. The 2-1 guide magnet M21 and the 2-2 guide magnet M22 spaced apart from each other in the Z-axis direction can be disposed at the first guide portion GG1a. The 2-3 guide magnet M23 and the 2-4 guide magnet M24 spaced apart from each other in the Z-axis direction can be disposed at the second guide portion GG1b.

[0091] The third guide portion GG2a and the fourth guide portion GG2b can be located on the inner surface of the second side portion of the second housing 1200. The third guide portion GG2a and the fourth guide portion GG2b can be symmetrically disposed above and below the side hole of the second housing 1200. The third guide portion GG2a and the fourth guide portion GG2b can face the third guide magnet M3 of the second actuator 300. The third guide portion GG2a and the fourth guide portion GG2b can be spaced apart from each other in the X-axis direction. The second driving magnet 501 and the second coil 502 can be disposed between the third guide portion GG2a and the fourth guide portion GG2b.

[0092] The fourth guide magnet M4 can be disposed at the third guide portion GG2a and the fourth guide portion GG2b. The 4-1 guide magnet M41 and the 4-2 guide magnet M42 spaced apart from each other in the Z-axis direction can be disposed at the third guide portion GG2a. The 4-3 guide magnet M43 and the 4-4 guide magnet M44 spaced apart from each other in the Z-axis direction can be disposed at the fourth guide portion GG2b.

[0093] The second housing 1200 can include a housing protrusion pr including pr1 to pr4 protruding inward in the optical axis direction or the Z-axis direction. The second housing 1200 can include a third side portion connecting the first side portion and the second side portion and a fourth side portion opposite the third side portion.

[0094] The housing protrusions pr can include first and second housing protrusions pr1 and pr2. The first and second housing protrusions pr1 and pr2 can be located on the inner surface of the third side. The first and second housing protrusions pr1 and pr2 can protrude or extend from the inner surface of the third side toward the fourth side or toward the first and second actuators 200 and 300.

[0095] The third and fourth housing protrusions pr3 and pr4 can be located on the inner surface of the fourth side. The third and fourth housing protrusions pr3 and pr4 can protrude or extend from the inner surface of the fourth side toward the third side or toward the first and second actuators 200 and 300.

[0096] The deformation of the guide portions GG1a, GG1b, GG2a, and GG2b can be reduced by the housing protrusions pr. By the improvement in rigidity provided by the housing protrusions pr, the flatness of the adjacent guide portions GG1a, GG1b, GG2a, and GG2b can be maintained. The housing protrusions pr can provide further improved straightness when the first and second actuators 200 and 300 move within the second housing 1200. Accordingly, the camera module 1000 can minimize the occurrence of decentration or tilting and provide optimal optical characteristics.

[0097] The first and second housing protrusions pr1 and pr2 can be located between the first and third guide portions GG1a and GG2a. The first and second housing protrusions pr1 and pr2 can overlap the first and third guide portions GG1a and GG2a in the Y-axis direction. The third and fourth housing protrusions pr3 and pr4 can be located between the second and fourth guide portions GG1b and GG2b. The third and fourth housing protrusions pr3 and pr4 can overlap the second and fourth guide portions GG1b and GG2b in the Y-axis direction.

[0098] The second stop portions ST2a and ST2b can be disposed on the bottom surface of the second housing 1200. The first housing 1100 can be coupled to the upper end of the second housing 1200, and the bottom surface of the second housing 1200 can be disposed opposite the first housing 1100. The first and second stop portions ST1a and ST1b and ST2a and ST2b can be disposed in sequence in the optical axis direction. The first and second stop portions ST1a and ST1b and ST2a and ST2b can be disposed on the movement paths of the first and second actuators 200 and 300.

[0099] The second stop portions ST2a and ST2b can include a 2-1 stop ST2a and a 2-2 stop ST2b symmetrically disposed on a bottom surface of the second housing 1200 with respect to the optical axis direction. The 2-1 stop ST2a can be disposed to face the first magnet holder 220 of the first actuator 200. The 2-1 stop ST2a can be disposed to overlap the 1-1 stop ST1a in the optical axis direction. The 2-2 stop ST2b can be disposed to face the second magnet holder 320 of the second actuator 300. The 2-2 stop ST2b can be disposed to overlap the 1-2 stop ST1b in the optical axis direction. The second stop portions ST2a and ST2b can mitigate contact with and impact on the second housing 1200 when the first actuator 200 and the second actuator 300 move in the optical axis direction.

[0100] A distance between the 1-1 stop ST1a and the 2-1 stop ST2a in the optical axis direction can be less than a distance between the 1-2 stop ST1b and the 2-2 stop ST2b in the optical axis direction. This reflects that a maximum moving distance (stroke) of the first actuator 200 is less than a maximum moving distance (stroke) of the second actuator 300.

[0101] The camera actuator can perform zooming by movement of the first actuator 200. The camera actuator can perform auto-focusing by movement of the second actuator 300. Accordingly, a moving distance for zooming can be less than a moving distance or stroke for auto-focusing.

[0102] To provide such a difference in moving distance or stroke, the 1-1 stop ST1a and the 1-2 stop ST1b can be disposed to be at least partially offset from each other in a second direction (i.e., the Y-axis direction). The 2-1 stop ST2a and the 2-2 stop ST2b can be disposed to be at least partially offset from each other in the second direction (i.e., the Y-axis direction).

[0103] The first driving magnet 401 can be disposed on the first actuator 200 in a perpendicular magnetization manner. N-pole and S-pole regions of the first driving magnet 401 can both be disposed to face the first coil 402. Accordingly, the N-pole and S-pole regions of the first driving magnet 401 can be disposed to correspond to regions in which a current flows in the X-axis direction or a direction opposite to the X-axis direction of the first coil 402, respectively.

[0104] When a magnetic force is applied from the N-pole region of the first driving magnet 401 in a direction opposite to the Y-axis direction and a current DE1 flows in a region of the first coil 402 corresponding to the N-pole region in a direction opposite to the X-axis direction, an electromagnetic force DEM1 can act in the Z-axis direction according to electromagnetic interaction (e.g., Fleming's left-hand rule). When a magnetic force is applied from the S-pole region of the first driving magnet 401 in a second direction (i.e., the Y-axis direction) and a current DE1 flows in a region of the first coil 402 corresponding to the S-pole region in the X-axis direction, an electromagnetic force DEM1 can act in the Z-axis direction according to electromagnetic interaction.

[0105] Since the first coil 402 is fixed to the side portion of the second housing 1200, the first actuator 200 on which the first driving magnet 401 is disposed can be moved in a direction opposite to the Z-axis direction by the electromagnetic force DEM1 according to the direction of the current. That is, the first driving magnet 401 can be moved in a direction opposite to the direction of the electromagnetic force applied to the first coil 402. In addition, the direction of the electromagnetic force can be changed according to the current of the coil and the magnetic force of the magnet.

[0106] An electromagnetic force DEM1 can be generated between the first driving magnet 401 and the first coil 402 so that the first actuator 200 can be moved in the optical axis direction by the first guide magnet M1 along the second guide magnet M2 located on the inner surface of the second housing 1200. The portions of the first guide magnet M1 and the second guide magnet M2 facing each other can have the same polarity, and a repulsive force can act between the portions.

[0107] Therefore, when the first actuator 200 is moved in the optical axis direction, tilting of the first actuator 200 can be prevented and its stroke movement can be guided by a magnetic levitation effect. In addition, the second guide magnet M2 can function as a guide rail, the effect of dynamic tilting caused by perpendicularity and flatness during injection molding of the actuator can be reduced, and since a ball is not used, dents caused by impact do not occur.

[0108] The length of the second guide magnet M2 in the optical axis direction can be set according to the stroke length of the first actuator 200 in the optical axis direction. The maximum stroke length of the first actuator 200 can be the distance between the 1-1 stopper ST1a and the 2-1 stopper ST2a in the optical axis direction. The maximum stroke length of the first actuator 200 can be less than the distance between the 1-1 stopper ST1a and the 2-1 stopper ST2a in the optical axis direction.

[0109] The first guide magnet M1 can always overlap the second guide magnet M2 in the Y-axis direction, regardless of when the first actuator 200 is maximally moved toward the first housing 1100 or when the first actuator 200 is maximally moved toward the bottom surface of the second housing 1200. For example, the 1-1 guide magnet M11 can be disposed to always face the 2-1 guide magnet M21 even when the first actuator 200 is maximally moved toward the first housing 1100 or toward the bottom surface of the second housing 1200.

[0110] A portion of the second guide magnet M2 and regions of the first driving magnet 401 adjacent to each other in the X-axis direction can have the same polarity. For example, a portion of the second guide magnet M2 disposed adjacent to a region of the first driving magnet 401 having an N pole can have an N pole. Respective portions of the 2-1 guide magnet M21 and the 2-2 guide magnet M22 facing the first guide magnet M1 can have different polarities from each other. Respective portions of the 2-1 guide magnet M21 and the 2-3 guide magnet M23 facing the first guide magnet M1 can have the same polarity. Respective portions of the 2-3 guide magnet M23 and the 2-4 guide magnet M24 facing the first guide magnet M1 can have different polarities from each other. Respective portions of the 2-2 guide magnet M22 and the 2-4 guide magnet M24 facing the first guide magnet M1 can have the same polarity. With this magnet polarity arrangement, magnetic interference can be minimized.

[0111] The second driving magnet 501 can be disposed on the second actuator 300 by a perpendicular magnetization method or the like. An N pole region and an S pole region of the second driving magnet 501 can both be disposed to face the second coil 502. Accordingly, the N pole region and the S pole region of the second driving magnet 501 can be respectively disposed to correspond to regions in which a current flows in the X-axis direction or in a direction opposite to the X-axis direction in the second coil 502.

[0112] When a magnetic force DM2 is applied from an N pole region of the second driving magnet 501 in the Y-axis direction and a current DE2 flows in the X-axis direction in a region of the second coil 502 corresponding to the N pole region, an electromagnetic force DEM2 can act in the Z-axis direction according to electromagnetic interaction (e.g., Fleming's left-hand rule). When a magnetic force is applied from an S pole region of the second driving magnet 501 in a direction opposite to the Y-axis direction and a current DE2 flows in a direction opposite to the X-axis direction in a region of the second coil 502 corresponding to the S pole region, an electromagnetic force DEM2 can act in the Z-axis direction according to electromagnetic interaction.

[0113] Since the second coil 502 is fixed to the side of the second housing 1200, according to the direction of the current, the second actuator 300 on which the second driving magnet 501 is disposed can be moved in a direction opposite to the Z-axis direction by the electromagnetic force DEM2. The direction of the electromagnetic force can change according to the current of the coil and the magnetic force of the magnet. That is, the second driving magnet 501 can be moved in a direction opposite to the direction of the electromagnetic force applied to the second coil 502. In addition, the direction of the electromagnetic force can change according to the current of the coil and the magnetic force of the magnet.

[0114] An electromagnetic force DEM2 can be generated between the second driving magnet 501 and the second coil 502, so that the second actuator 300 can be moved in the optical axis direction by the third guide magnet M3 along the fourth guide magnet M4 located on the inner surface of the second housing 1200. The portions of the third guide magnet M3 and the fourth guide magnet M4 facing each other can have the same polarity, and a repulsive force can act between the portions.

[0115] Therefore, when the second actuator 300 is moved in the optical axis direction, tilting of the second actuator 300 can be prevented and its stroke movement can be guided by the magnetic levitation effect. In addition, the fourth guide magnet M4 can be used as a guide rail, the effect of dynamic tilting caused by perpendicularity and flatness during actuator injection molding can be reduced, and since a ball is not used, dents caused by impact do not occur.

[0116] The length of the fourth guide magnet M4 in the optical axis direction can be set according to the stroke length of the second actuator 300 in the optical axis direction. The maximum stroke length of the second actuator 300 can be the distance between the 1-2 stopper ST1b and the 2-2 stopper ST2b in the optical axis direction. The maximum stroke length of the second actuator 300 can be less than the distance between the 1-2 stopper ST1b and the 2-2 stopper ST2b in the optical axis direction.

[0117] The third guide magnet M3 can always overlap the fourth guide magnet M4 in the Y-axis direction, regardless of when the second actuator 300 is maximally moved toward the first housing 1100 or when the second actuator 300 is maximally moved toward the bottom surface of the second housing 1200. For example, the 3-1 guide magnet M31 can be disposed to always face the 4-1 guide magnet M41 even when the second actuator 300 is maximally moved toward the first housing 1100 or toward the bottom surface of the second housing 1200.

[0118] A portion of the fourth guide magnet M4 adjacent to a region of the second driving magnet 501 having an N pole in the X-axis direction can have an N pole. For example, a portion of the fourth guide magnet M4 disposed adjacent to a region of the second driving magnet 501 having an N pole can have an N pole. Respective portions of the 4-1 guide magnet M41 and the 4-2 guide magnet M42 facing the third guide magnet M3 can have different polarities from each other. Respective portions of the 4-1 guide magnet M41 and the 4-3 guide magnet M43 facing the third guide magnet M3 can have the same polarity. Respective portions of the 4-3 guide magnet M43 and the 4-4 guide magnet M44 facing the third guide magnet M3 can have different polarities from each other. Respective portions of the 4-2 guide magnet M42 and the 4-4 guide magnet M44 facing the third guide magnet M3 can have the same polarity. With such a magnet polarity arrangement, magnetic interference can be minimized.

[0119] The first driving magnet 401 and the first coil 402 can provide driving forces F3A and F3B for moving the first actuator 200 in the optical axis direction. The first actuator 200 on which the first driving magnet 401 is seated can be moved in the optical axis direction by electromagnetic forces F3A and F3B between the first coil 402 and the first driving magnet 401. The second lens group 102 seated on the first actuator 200 can also be moved in the optical axis direction.

[0120] The second driving magnet 501 and the second coil 502 can provide driving forces F4A and F4B for moving the second actuator 300 in the optical axis direction. The second actuator 300 on which the second driving magnet 501 is seated can be moved in the optical axis direction by electromagnetic forces F4A and F4B between the second coil 502 and the second driving magnet 501. The third lens group 103 seated on the second actuator 300 can also be moved in the optical axis direction.

[0121] The focal length or magnification of the optical system can be changed by movement of the second lens group 102 and the third lens group 103. The magnification can be changed by movement of the second lens group 102. In other words, zooming can be performed. The focus can be adjusted by movement of the third lens group 103. In other words, autofocusing can be performed. With such a configuration, the camera module 1000 can be a fixed zoom camera module or a continuous zoom camera module.

[0122] A base or a base member of the circuit board can be located between the lens unit 100 and the image sensor IS. Components such as a filter can be fixed to the base member. The base member can be disposed to surround the image sensor. With such a configuration, the image sensor can be protected from foreign matter, etc., thereby improving the reliability of the element. However, the base member is omitted in some of the following drawings for the purpose of illustration. However, the present disclosure can not be limited to such a structure.

[0123] The camera module 1000 can be a zoom actuator and an AF actuator. For example, the camera module 1000 can support one or more lenses and move the lenses according to a control signal of a predetermined controller to perform at least one of an auto focus function and a zoom function. The first actuator 200 can be a fixed zoom actuator or a continuous zoom actuator. The second actuator 300 can be a fixed zoom actuator or a continuous zoom actuator. The first actuator 200 can provide movement of the second lens group 102. The second actuator 300 can provide movement of the third lens group 103.

[0124] In addition to the first actuator 200 and the second actuator 300, at least one of a third actuator (not shown) and a guide pin (not shown) can be provided. The above description can be applied to the third actuator and the guide pin. Accordingly, the second camera actuator can perform a high magnification zoom function through the second driving part. For example, the first actuator 200 and the second actuator 300 can be moving lenses that move through the second driving part and the guide pin (not shown), and the third lens assembly (not shown) can be a fixed lens, but the present disclosure is not limited thereto.

[0125] For example, the third actuator (not shown) can function as a focuser configured to form an image of light at a certain position, and the first actuator 200 can function as a variator configured to reform the image formed by the third actuator (not shown) as a focuser at another position. The distance to the subject or the image distance can vary greatly in the first actuator 200, so that the magnification can vary greatly, and the first actuator 200 as a variator can play an important role in changing the focal length or magnification of the optical system. The image point formed by the first actuator 200 as a variator can vary slightly depending on the position. Accordingly, the second actuator 300 can perform a position compensation function on the image formed by the variator. For example, the second actuator 300 can function as a compensator configured to accurately form the image point formed by the first actuator 200 as a variator at the actual image sensor position.

[0126] The image sensor can be located inside or outside the camera module 1000. The image sensor can be located on a circuit board. The image sensor can receive light and convert the received light into an electrical signal. In addition, the image sensor can include a plurality of pixels arranged in an array. The image sensor can be located on the optical axis.

[0127] The camera module has a high resolution and a small size, and provides various photographing functions, such as an optical zoom function including zoom-in and zoom-out, an auto focus (AF) function, and a hand-shake correction or optical image stabilization (OIS) function.

[0128] These photographing functions can be implemented by combining a plurality of lenses and directly moving the lenses. The auto focus and hand shake correction functions can be performed by moving or tilting a plurality of lens modules fixed to a lens holder and having an aligned optical axis in the optical axis direction or a direction perpendicular to the optical axis direction, and a separate actuator can be used to drive the lens modules.

[0129] When the magnification is changed and the focus is maintained, the zoom lens and the AF lens are moved, respectively, and the time required to reach a desired position is associated with the focus time. In a conventional structure, since the magnification is not high and the stroke length is relatively short, a desired performance can be achieved by a conventional proportional-integral-derivative (PID) control. However, as the magnification increases, the stroke length increases, and thus there is a problem in that performance cannot be secured by a conventional PID control.

[0130] In addition, in a ball-type actuator, when the moving distance is small, increasing the integral gain increases the moving speed. However, when the moving distance is large, increasing the integral gain can increase the risk of oscillation, and can rather decrease the speed. In addition, when the speed of the actuator decreases, the focus can become blurred, and other subjects can be recognized due to a failure of the focus maintaining function.

[0131] Figure 14 is a block diagram of a camera module according to the present embodiment, Figure 15 is a block diagram of a camera module according to the present embodiment, Figures 16 to 18 is a view for explaining a control operation of a camera module according to the present embodiment.

[0132] The camera module according to the present embodiment can include a PID controller 11, a parameter generator 12, and a controller 13, and can further include a driving part 14 and a position sensor 15. When the camera module is a folded camera module, the camera module can further include a plurality of lens groups and a prism.

[0133] In the camera module, an actuator can drive a lens or a lens module to perform an AF function, an OIS function, or a zoom function. The actuator can drive the lens or the lens module in the optical axis direction or a direction perpendicular to the optical axis direction. A field of view can be adjusted according to a position of a zoom lens to change a magnification. A focus point can be determined according to a position of an AF lens.

[0134] The actuator can be driven by a driving signal from the controller 13 and the driving part 14. The controller 13 can generate the driving signal using a control value generated by the PID controller 11. The controller 13 can be a driver IC. The driving signal generated by the controller 13 can be a driving current.

[0135] The driving portion 14 is configured to move the actuator, and can include a coil and a magnet. When a driving current is applied to the coil in the driving portion 14, the actuator can move by electromagnetic interaction between the coil and the magnet.

[0136] The position sensor 15 detects a position of the lens or the lens module. The position sensor 15 can be driven by power applied from the controller 13. The position sensor 15 can be a Hall sensor. The position sensor 15 can detect the position of the lens or the lens module by sensing a position of a magnet disposed on the lens module. The position information of the lens detected by the position sensor 15 can be transmitted to the controller 13. The controller 13 can perform feedback control in which the driving signal is generated again using the position information of the lens detected by the position sensor 15.

[0137] The PID controller 11 can perform a PID control operation based on an error value that is a difference between a target position and a current position of the lens, a first value that is a preset proportional gain (P gain), a second value that is an integral gain (I gain), and a third value that is a differential gain (D gain). In this case, the target position of the lens can be information received from the controller 13, and the current position of the lens can be position information of the lens detected by the position sensor 15. Since the PID control operation is obvious to those skilled in the art, a description thereof will be omitted.

[0138] The parameter generator 12 can adjust at least one of the proportional gain, the integral gain, and the differential gain according to a control interval of the lens. Referring to Figure 19 , the moving operation of the lens can be performed according to a unit step response of a second-order system, and can have a form in which overshoot occurs after the lens rapidly reaches a target position, and oscillation is reduced near the target position. In the PID control operation, the degree of influence can be greater in the order of the integral gain, the proportional gain, and the differential gain. In the PID control operation, the size of the integral gain can have the greatest influence on the slope oscillation.

[0139] The parameter generator 12 can increase at least one of the first value and the second value during an initial moving operation of the lens. The parameter generator 12 can increase the proportional gain and the integral gain to values greater than the preset first value and second value, respectively, during the initial moving operation of the lens. The parameter generator 12 can decrease at least one of the first value and the second value after the lens reaches the target position. The parameter generator 12 can decrease the proportional gain and the integral gain to values smaller than the preset first value and second value, respectively, after the lens reaches the target position.

[0140] The control interval of the lens can include a first interval A of Figure 17 , and a second interval B of Figure 17a second interval B in which the movement operation of the lens ends after the first interval.

[0141] When the current position of the lens corresponds to the first interval, the parameter generator 12 can increase at least one of the first value and the second value. When the current position of the lens corresponds to the first interval, the parameter generator 12 can increase the proportional gain and the integral gain to values greater than the preset first value and the second value, respectively. When the current position of the lens corresponds to the second interval, the parameter generator 12 can decrease at least one of the first value and the second value. When the current position of the lens corresponds to the second interval, the parameter generator 12 can decrease the proportional gain and the integral gain to values less than the preset first value and the second value, respectively.

[0142] According to a modification, the parameter generator 12 can adjust at least one of the proportional gain, the integral gain, and the differential gain according to the error value. When the error value is greater than a preset first error value, the parameter generator 12 can increase at least one of the first value and the second value. When the error value is less than the preset first error value, the parameter generator 12 can decrease at least one of the first value and the second value.

[0143] When the error value, which is the difference between the initial position and the target position, is 100, the preset first error value can be about 20 to about 30. These values are merely examples, and the present disclosure is not particularly limited thereto.

[0144] As described above, when the proportional gain and the integral gain are increased during the initial operation of the lens or when the error value is large, the rate at which the error value converges to zero becomes faster than in the conventional control operation. In contrast, when the proportional gain and the integral gain are decreased after the lens reaches the target position or when the error value is small, overshoot can be reduced, and the lens can stably reach the target position.

[0145] The conventional lens stroke range is about 10 μm to about 3000 μm. According to the present embodiment, even if the lens stroke range is about 10 μm to about 5000 μm, as in a continuous zoom camera module, the target driving speed of about 15 μm / sec to about 60 μm / sec can be stably satisfied.

[0146] Referring to Figure 18 , the parameter generator 12 can adjust at least one of the first value, the second value, and the third value according to the error value on a logarithmic scale. That is, the parameter generator 12 can adjust the gain such that the amount of increase in the variable gain value decreases as the error value increases. Alternatively, when the parameter generator 12 adjusts the first value and the second value according to the position of the lens or the error value, the first value and the second value can be adjusted on a logarithmic scale.

[0147] Figure 19is a perspective view of a mobile terminal to which a camera module according to an embodiment is applied.

[0148] As shown in Figure 19 , a mobile terminal 1500 according to an embodiment can include a camera module 1000 disposed on a rear surface thereof, a flash module 1530, and an auto focus device 1510.

[0149] The camera module 1000 can include a photographing function and an auto focus function. For example, the camera module 1000 can include an auto focus function using an image. The camera module 1000 processes an image frame of a still image or a moving image acquired by an image sensor in a photographing mode or a video call mode.

[0150] The processed image frame can be displayed on a predetermined display portion and can be stored in a memory. A camera (not shown) can also be disposed on a front surface of a main body of the mobile terminal. For example, the camera module 1000 can include a first camera module 1000A and a second camera module 1000B, and OIS can be implemented with the first camera module 1000A together with an AF function or a zoom function.

[0151] The flash module 1530 can include a light emitting element configured to emit light therein. The flash module 1530 can be operated by an operation of a camera of the mobile terminal or by a control of a user.

[0152] The auto focus device 1510 can include one of packages of a surface emitting laser element as a light emitter. The auto focus device 1510 can include an auto focus function using a laser. The auto focus device 1510 can be mainly used in a condition in which an auto focus function using an image of the camera module 1000 is deteriorated, for example, at a distance of 10 m or less or in a dark environment. The auto focus device 1510 can include a light emitter including a vertical cavity surface emitting laser (VCSEL) semiconductor element and a light receiver configured to convert light energy into electrical energy, for example, a photodiode.

[0153] Figure 20 is a perspective view of a vehicle to which a camera module according to an embodiment is applied. Figure 20 is an appearance view of a vehicle including a vehicle driving assistance device to which a camera module 1000 according to an embodiment is applied.

[0154] Referring to Figure 20 , a vehicle 700 according to an embodiment can include wheels 13FL and 13FR rotated by a power source and a predetermined sensor. The sensor can be a camera sensor 2000, but the present disclosure is not limited thereto.

[0155] The camera 2000 can be a camera sensor to which the camera module 1000 according to the embodiment is applied. The vehicle 700 according to the embodiment can acquire image information through the camera sensor 2000 configured to photograph a front image or a surrounding image, determine a lane non-recognition situation using the image information, and generate a virtual lane when a lane is not recognized.

[0156] The camera sensor 2000 can photograph a front region of the vehicle 700 to acquire a front image, and a processor (not shown) can acquire image information by analyzing objects included in the front image. When a lane, a neighboring vehicle, a driving obstacle, and objects such as a median strip, a curb, or a roadside tree corresponding to an indirect road marking are photographed in an image photographed by the camera sensor 2000, the processor can detect the objects and include the objects in the image information. In this case, the processor can further supplement the image information by acquiring information about a distance of the objects detected via the camera sensor 2000.

[0157] The image information can be information about objects photographed in an image. The camera sensor 2000 can include an image sensor and an image processing module. The camera sensor 2000 can process a still image or a dynamic image acquired by the image sensor (for example, a CMOS or a CCD image sensor).

[0158] The image processing module can process a still image or a dynamic image acquired through the image sensor, extract necessary information, and transmit the extracted information to the processor. In this case, the camera sensor 2000 can include a stereo camera to improve the measurement accuracy of objects and further acquire information such as a distance between the vehicle 700 and the objects, but the disclosure is not limited thereto.

[0159] Those skilled in the art related to the present embodiment will appreciate that the present disclosure can be implemented in modified forms without departing from the essential characteristics of the above-described description. Accordingly, the disclosed method should be considered from an illustrative point of view rather than a restrictive point of view. The scope of the present disclosure is defined by the claims rather than the foregoing description, and all differences falling within the equivalent scope thereof should be interpreted as included in the present disclosure.

Claims

1. A camera module, comprising: A first housing, the first housing including a fixed lens; A second housing is connected to the first housing; An actuator, wherein the actuator is disposed within the second housing; A coil and a driving magnet, the coil and the driving magnet being configured to move the actuator along the optical axis; A first guide magnet is disposed on the actuator; as well as The second guide magnet is disposed inside the second housing and faces the first guide magnet.

2. The camera module according to claim 1, wherein, A portion of the first guide magnet and a portion of the second guide magnet, which are facing each other, have the same polarity.

3. The camera module according to claim 1, wherein, The length of the first guide magnet in the optical axis direction is less than the length of the second guide magnet in the optical axis direction.

4. The camera module according to claim 1, wherein, The actuator includes a lens holder with a lens and a magnet holder with the driving magnet, wherein the driving magnet includes regions with different magnetic poles arranged along the optical axis.

5. The camera module according to claim 4, wherein, The first guide magnet includes a first-1 guide magnet disposed adjacent to the region of the driving magnet having an N pole and a first-2 guide magnet disposed adjacent to the region of the driving magnet having an S pole, wherein the first-1 guide magnet has an N pole and the first-2 guide magnet has an S pole.

6. The camera module according to claim 5, wherein, The second guide magnet includes a second-1 guide magnet positioned facing the first-1 guide magnet and a second-2 guide magnet positioned facing the first-2 guide magnet.

7. The camera module according to claim 1, wherein, The inner surface of the second housing includes a first guide portion and a second guide portion, the first guide portion and the second guide portion are provided with the second guide magnet, and the first guide portion and the second guide portion are spaced apart from each other, wherein the coil and the driving magnet are provided between the first guide portion and the second guide portion.

8. The camera module according to claim 7, wherein, The second guide magnet includes a second-1 guide magnet and a second-2 guide magnet, which are disposed in the first guide portion and spaced apart from each other and each having different magnetic poles. The second guide magnet also includes a second-3 guide magnet and a second-4 guide magnet, which are disposed in the second guide portion and spaced apart from each other and each having different magnetic poles.

9. The camera module according to claim 2, further comprising a substrate, the substrate being coupled to the outer surface of the second housing, wherein, The coil is disposed on the substrate and electrically connected to the substrate.

10. The camera module according to claim 1, wherein, A first stop portion is provided on one surface of the first housing facing the second housing, wherein a second stop portion is provided on the inner surface of the second housing opposite to the side where the first housing is provided, and wherein the maximum stroke length of the actuator is equal to or less than the distance between the first stop portion and the second stop portion in the optical axis direction.

Images