Sensor shift actuator and imaging device including the same

Abstract

A sensor shift actuator and a device including the same are provided. The sensor shift actuator includes a first movable body, a fixed body, a driving unit, and a position sensing unit. In the first movable body, an image sensor having an imaging surface is provided. In the fixed body, the first movable body is arranged to be movable in a first direction and a second direction parallel to the imaging surface. The driving unit is configured to provide a driving force to the first movable body. The position sensing unit is configured to sense the position of the first movable body and includes a sensing coil provided on any one of the first movable body and the fixed body and a sensing yoke unit provided on the other of the first movable body and the fixed body. The sensing yoke unit includes a plurality of sensing yokes spaced apart from each other in a direction orthogonal to the imaging surface, and each sensing yoke is configured to have a width that varies in the moving direction of the first movable body.

Description

[0001] Cross - reference to related applications

[0002] This application claims the priority benefit of Korean Patent Application No. 10 - 2021 - 0185825, filed with the Korean Intellectual Property Office on December 23, 2021. For all purposes, the entire disclosure of the Korean patent application is incorporated herein by reference. Technical field

[0003] The following description relates to a sensor shift actuator. Background art

[0004] Recently, camera modules have been implemented in mobile communication terminals such as, but not limited to, smart phones, tablet personal computers (PCs), and laptop computers.

[0005] In addition, the camera module is provided with one or more actuators having a focus adjustment operation and a shake correction operation to produce a high - resolution image.

[0006] For example, the focus can be adjusted by moving the lens module in the optical axis (Z - axis) direction, or the shake can be corrected by moving the lens module in a direction orthogonal to the optical axis (Z - axis).

[0007] However, with the improvement of the performance of camera modules in recent years, the weight of the lens module has also increased, and in addition, due to the influence of the weight of the driving unit for moving the lens module, it may be difficult to precisely control the driving force to achieve shake correction.

[0008] In addition, a Hall sensor can be used as a position sensor to sense the position of the lens module, and as the number of Hall sensors increases, the accuracy of position determination can be improved. However, as the number of Hall sensors increases, the control configuration becomes complex, the unit cost increases, and there are limitations in reducing the size from a mechanical perspective.

[0009] In addition, since the Hall sensor is a method of detecting the magnetic force of a permanent magnet, a permanent magnet may be required, and thus there is a problem that the magnetic flux of the permanent magnet affects surrounding electronic components. Summary of the invention

[0010] This summary of the invention is provided to introduce a selection of concepts that are further described below in the specification in a simplified form. This summary of the invention is not intended to identify key features or essential features of the claimed subject matter, nor is it intended to be used to help determine the scope of the claimed subject matter.

[0011] In general, the sensor shift actuator includes a first movable body, a fixed body, a driving unit, and a position sensing unit. An image sensor having an imaging surface is provided in the first movable body. In the fixed body, the first movable body is arranged to be movable in a first direction parallel to the imaging surface and a second direction parallel to the imaging surface. The driving unit is configured to provide a driving force to the first movable body, and the position sensing unit is configured to sense the position of the first movable body and includes a sensing coil provided on either the first movable body or the fixed body and a sensing yoke unit provided on the other of the first movable body and the fixed body. The sensing yoke unit includes a plurality of sensing yokes spaced apart from each other in a direction orthogonal to the imaging surface, and each sensing yoke is configured to have a width that varies in the moving direction of the first movable body.

[0012] Each of the plurality of sensing yokes may include a first sensing yoke and a second sensing yoke, and the first sensing yoke and the second sensing yoke each face the sensing coil in a direction parallel to the imaging surface.

[0013] The first sensing yoke and the second sensing yoke may each have a width that increases and decreases in the moving direction of the first movable body, and the positions where the widths of the first sensing yoke and the second sensing yoke increase or decrease may be different.

[0014] The first sensing yoke and the second sensing yoke may each have a plurality of minimum widths and a plurality of maximum widths. The position where the first sensing yoke has the minimum width is different from the position where the second sensing yoke has the minimum width, and the position where the first sensing yoke has the maximum width is different from the position where the second sensing yoke has the maximum width.

[0015] The winding thickness of the sensing coil may be greater than the minimum width of each sensing yoke and less than the maximum width of each sensing yoke.

[0016] The boundary line defining the width of each sensing yoke among the plurality of sensing yokes may have a sine wave shape.

[0017] The direction of the current flowing through the portion of the sensing coil facing the first sensing yoke may be different from the direction of the current flowing through the portion of the sensing coil facing the second sensing yoke.

[0018] The distance between the first sensing yoke and the second sensing yoke in the direction orthogonal to the imaging surface may be less than the distance between the two ends of the sensing coil in the direction orthogonal to the imaging surface.

[0019] The position sensing unit may include a first position sensor and a second position sensor. The first position sensor is configured to sense the position of the first movable body in the first direction, and the second position sensor is configured to sense the position of the first movable body in the second direction. The first direction and the second direction may be orthogonal to each other.

[0020] The first position sensor may include a first sensing coil disposed on a fixed body and a first sensing yoke unit disposed on a first movable body. The first sensing coil and the first sensing yoke unit may face each other in a second direction. The first sensing yoke unit may include a first sensing yoke and a second sensing yoke spaced apart from each other in a direction orthogonal to the imaging plane. The second position sensor may include a second sensing coil disposed on the fixed body and a second sensing yoke unit disposed on the first movable body. The second sensing coil and the second sensing yoke unit may face each other in a first direction, and the second sensing yoke unit may include a third sensing yoke and a fourth sensing yoke spaced apart from each other in a direction orthogonal to the imaging plane.

[0021] The sensor shift actuator may include a second movable body disposed between the first movable body and the fixed body. Wherein, the first movable body may move together with the second movable body in a first direction, and wherein, the first movable body may be movable relative to the second movable body in a second direction.

[0022] The sensor shift actuator may include a first ball member disposed between the second movable body and the fixed body and a second ball member disposed between the first movable body and the second movable body. Wherein, the first ball member is arranged to be rollable in a first direction, and the second ball member is arranged to be rollable in a second direction.

[0023] A first magnetic member may be disposed on the second movable body, and a second magnetic member may be disposed at positions facing the first magnetic member on each of the first movable body and the fixed body, and an attractive force acts between the first magnetic member and the second magnetic member.

[0024] The drive unit may include a coil unit disposed on any one of the first movable body and the fixed body and a movable yoke unit disposed on the other of the first movable body and the fixed body. And wherein, the movable yoke unit may be formed of a soft magnetic material capable of being magnetized by the magnetic field of the coil unit.

[0025] The coil unit may include a first coil, a second coil, a third coil, and a fourth coil disposed on the fixed body. The movable yoke unit may include a first movable yoke, a second movable yoke, a third movable yoke, and a fourth movable yoke disposed on the first movable body. The first coil and the second coil are spaced apart from each other in a first direction, the third coil and the fourth coil are spaced apart from each other in a second direction, and the first movable yoke to the fourth movable yoke are arranged to face the first coil to the fourth coil respectively.

[0026] When power is supplied to the coil unit, the movable yoke unit may be magnetized, and when power supply to the coil unit is cut off, the movable yoke unit loses its magnetism.

[0027] In general, the apparatus includes a camera module, the camera module including a fixed body, a first movable body, a second movable body, and a position sensing unit, wherein the first movable body is configured to move an image sensor in a first direction orthogonal to an optical axis and a second direction orthogonal to the optical axis, the second movable body is disposed between the first movable body and the fixed body, and the position sensing unit is configured to detect a position of the first movable body in the first direction and the second direction, wherein each of the position sensing units includes a sensing coil and a sensing yoke unit, wherein the sensing yoke unit includes a first sensing yoke and a second sensing yoke spaced apart from each other, and wherein each of the first sensing yoke and the second sensing yoke is configured to have a width that continuously increases and decreases along a direction in which the first movable body moves.

[0028] A position at which the first sensing yoke has a maximum width may be different from a position at which the second sensing yoke has a maximum width.

[0029] Boundary lines defining a width of the first sensing yoke and a width of the second sensing yoke may be configured to have a sinusoidal shape.

[0030] Other features and aspects will be apparent from the following detailed description, the accompanying drawings, and the claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic cross-sectional view showing an example sensor shift actuator according to one or more embodiments is shown.

[0032] Figure 2A 、 Figure 2B and Figure 2C A traction unit or device according to one or more embodiments is shown.

[0033] Figure 3 A schematic plan view showing an example sensor shift actuator according to one or more embodiments is shown.

[0034] Figure 4A 、 Figure 4B 、 Figure 4C and Figure 4D A state in which a first movable body moves is schematically shown according to one or more embodiments.

[0035] Figure 5 An example in which a position of a driving unit or a driver is changed in a sensor shift actuator according to one or more embodiments is shown.

[0036] Figure 6A 、 Figure 6B 、 Figure 6C and Figure 6D A state in which a first movable body moves in an arrangement of a driving unit as shown in Figure 5 is schematically shown.

[0037] Figure 7A and Figure 7B shows that Figure 3 The examples also include examples of a position sensing unit or sensor.

[0038] Figure 8 Shows a view of a sensing yoke and a sensing coil of a position sensor according to one or more embodiments.

[0039] Figure 9A and Figure 9B Is a diagram showing changes in the positional relationship between a first sensing yoke and a first sensing coil in a position sensor according to the movement of a first movable body according to one or more embodiments.

[0040] Figure 10 Is a graph showing the inductance of a first sensing coil according to the movement of a first movable body in one direction.

[0041] Figure 11A Is a graph showing a plurality of inductances of a first sensing coil corresponding to a first sensing yoke and a second sensing yoke of a sensor displacement actuator according to one or more embodiments.

[0042] Figure 11B shows Figure 11A The arctangent processing values of the plurality of inductances shown in

[0043] Figure 12 Is a schematic cross-sectional view of an example camera module according to one or more embodiments.

[0044] Figure 13 Is a schematic cross-sectional view of an example camera module according to one or more embodiments.

[0045] In all the drawings and the detailed description, the same reference numerals may refer to the same or similar elements. The drawings may not be drawn to scale, and for clarity, illustration, and convenience, the relative dimensions, proportions, and depictions of elements in the drawings may be exaggerated. Detailed Description

[0046] The following detailed description is provided to assist the reader in obtaining a comprehensive understanding of the methods, apparatuses, and / or systems described herein. However, after understanding the disclosure of the present application, various variations, modifications, and equivalents of the methods, apparatuses, and / or systems described herein will be apparent. For example, the sequences of operations described herein are merely examples and are not limited to the sequences set forth herein, but rather may be changed as will be apparent after understanding the disclosure of the present application, except for operations that must occur in a certain order. Additionally, descriptions of features known after understanding the disclosure of the present application may be omitted for greater clarity and conciseness, noting that the omission of features and descriptions of features is not intended to admit them as common general knowledge.

[0047] The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatuses, and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0048] Although terms such as "first", "second", and "third" may be used herein to describe various components, parts, regions, layers, or sections, these components, parts, regions, layers, or sections should not be limited by these terms. Rather, these terms are only used to distinguish one component, part, region, layer, or section from another. Thus, without departing from the teachings of the examples described herein, the first component, first part, first region, first layer, or first section mentioned in the examples may also be referred to as the second component, second part, second region, second layer, or second section.

[0049] Throughout the specification, when an element such as a layer, region, or substrate is described as being "on", "connected to", or "coupled to" another element, it may be directly "on", directly "connected to", or "coupled to" the other element, or there may be one or more other elements intervening therebetween. In contrast, when an element is described as being "directly on", "directly connected to", or "directly coupled to" another element, there can be no other elements intervening therebetween. Similarly, expressions such as "between", "directly between", "adjacent to", and "directly adjacent to" may be interpreted as described above.

[0050] The terms used in this disclosure are for the purpose of describing particular examples only and are not intended to limit the disclosure. As used herein, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more of them. As used herein, the terms "comprises," "comprising," and "having" mean the presence of the stated features, numbers, operations, elements, components, and / or combinations thereof, but do not preclude the presence or addition of one or more other features, numbers, operations, elements, components, and / or combinations thereof. The term "may" as used herein with respect to an example or embodiment (e.g., what may be included or implemented with respect to an example or embodiment) means that there is at least one example or embodiment that includes or implements such a feature, and all examples or embodiments are not limited thereto.

[0051] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs after understanding this disclosure. Terms such as those defined in a common dictionary should be interpreted to have a meaning consistent with their meaning in the context of the relevant art and this disclosure, and should not be understood in an idealized or overly formal sense unless expressly so defined herein.

[0052] According to one or more examples, a sensor shift actuator may be a component of a camera module. Additionally, the camera module may be mounted on a portable electronic device. By way of example only, the portable electronic device may be a portable electronic device such as a mobile communication terminal, a smart phone, or a tablet PC.

[0053] One or more examples may provide a sensor shift actuator that improves jitter correction performance.

[0054] Figure 1 A schematic cross-sectional view of an example sensor shift actuator according to one or more embodiments is shown.

[0055] Referring Figure 1 , the sensor shift actuator 100 includes a first movable body 110, a fixed body 130, and a driving unit 120.

[0056] An image sensor 111 is disposed on the first movable body 110, and the first movable body 110 is disposed to be movable relative to the fixed body 130.

[0057] The first movable body 110 is a component that moves together with the image sensor 111. For example, the first movable body 110 may include a sensor substrate 112 on which the image sensor 111 is mounted and a sensor bracket 113 coupled to the sensor substrate 112.

[0058] The image sensor 111 may be disposed on a first surface of the sensor substrate 112, and a connector 150 for transmitting signals of the image sensor 111 to the outside may be disposed on a second surface of the sensor substrate 112. A flexible substrate 151 that is flexibly bent according to the movement of the image sensor 111 may be connected to the connector 150.

[0059] Signals from the image sensor 111 may be transmitted to other electronic components through the sensor substrate 112, the connector 150, and the flexible substrate 151.

[0060] The fixing body 130 may include a base 131 and a member fixedly coupled to the base 131. For example, the fixing body 130 may include a coil unit 122 that will be described later.

[0061] The driving unit 120 may move the first movable body 110 and the image sensor 111.

[0062] Through the operation of the driving unit 120, the first movable body 110 may move in a direction orthogonal to the direction facing the imaging surface 111a of the image sensor 111 (i.e., orthogonal to the optical axis or orthogonal to the Z-axis direction). In an example, the driving unit 120 may correct jitter that occurs when a camera module (e.g., Figure 12 the camera module 10) on which the image sensor 111 is mounted performs an imaging operation.

[0063] The driving unit 120 may move the first movable body 110 on which the image sensor 111 is mounted in a first direction (e.g., the X direction) and a second direction (e.g., the Y direction) orthogonal to the optical axis (Z axis). The first direction (e.g., the X direction) and the second direction (e.g., the Y direction) may intersect each other or may be perpendicular to each other. For example, the driving unit 120 may move the first movable body 110 in a first direction (e.g., the X direction) and / or a second direction (e.g., the Y direction) orthogonal to the optical axis (Z axis), and accordingly correct jitter.

[0064] In one or more examples, the direction facing the imaging surface 111a of the image sensor 111 may be referred to as the optical axis (Z-axis) direction. That is, the first movable body 110 may move in a direction orthogonal to the optical axis (Z axis) with respect to the fixing body 130.

[0065] In the drawings showing one or more examples, when the first movable body 110 moves in a direction parallel to the imaging surface 111a, it may be understood that the first movable body 110 moves in a direction orthogonal to the optical axis (Z axis).

[0066] When the first movable body 110 moves in the first direction (e.g., the X direction), it can be understood that the first movable body 110 moves in a direction orthogonal to the optical axis (Z axis). In another example, when the movable yoke unit 121 and the coil unit 122 face each other in the first direction (e.g., the X direction), it can be understood that the movable yoke unit 121 and the coil unit 122 face each other in a direction orthogonal to the optical axis (Z axis).

[0067] In addition, the first direction (e.g., the X direction) and the second direction (e.g., the Y direction) are examples of two directions that are orthogonal to the optical axis (Z axis) and cross each other, and in one or more examples, the first direction (e.g., the X direction) and the second direction (e.g., the Y direction) can be understood as two directions that are orthogonal to the optical axis (Z axis) and cross each other or are perpendicular to each other.

[0068] In an example, the sensor shift actuator 100 may include a second movable body 140 disposed between the first movable body 110 and the fixed body 130. The second movable body 140 may include a guiding member 141 and a component (e.g., a first magnetic member 124) fixedly coupled to the guiding member 141.

[0069] In an example, the first ball member B1 may be disposed between the fixed body 130 and the second movable body 140, and the second ball member B2 may be disposed between the second movable body 140 and the first movable body 110.

[0070] At least one of the fixed body 130 and the second movable body 140 may include a first guiding groove G1 that houses at least a portion of the first ball member B1. For example, the first guiding groove G1 may be provided on at least one of the surfaces of the fixed body 130 and the second movable body 140 that face each other in the optical axis (Z axis) direction.

[0071] At least one of the second movable body 140 and the first movable body 110 may include a second guiding groove G2 that houses at least a portion of the second ball member B2. For example, the second guiding groove G2 may be provided on at least one of the surfaces of the second movable body 140 and the first movable body 110 that face each other in the optical axis (Z axis) direction.

[0072] In one or more examples, for ease of description, the first ball member B1, the second ball member B2, the first guiding groove G1, and the second guiding groove G2 may be described in the singular form, but in the examples, these parts may be provided in plural.

[0073] The first guide groove G1 and the second guide groove G2 can extend in two directions orthogonal to the optical axis (Z-axis) respectively, and can cross each other. In the example, the first guide groove G1 can extend in a first direction (e.g., the X direction), and the second guide groove G2 can extend in a second direction (e.g., the Y direction). The first ball member B1 and the second ball member B2 can roll along the first guide groove G1 and the second guide groove G2 respectively.

[0074] For example, the first ball member B1 can roll along the first guide groove G1 in the first direction (e.g., the X direction), and the second ball member B2 can roll along the second guide groove G2 in the second direction (e.g., the Y direction).

[0075] Therefore, in the example, the second movable body 140 can move relative to the fixed body 130 in the first direction (e.g., the X direction), and the movement in a direction other than the first direction (e.g., the X direction) can be restricted. In addition, the first movable body 110 can move relative to the second movable body 140 in the second direction (e.g., the Y direction), and the movement in a direction other than the second direction (e.g., the Y direction) can be restricted.

[0076] When a driving force is generated in the first direction (e.g., the X direction), the first movable body 110 and the second movable body 140 can move together relative to the fixed body 130 in the first direction (e.g., the X direction). In addition, when a driving force is generated in the second direction (e.g., the Y direction), the first movable body 110 can move relative to the second movable body 140 in the second direction (e.g., the Y direction).

[0077] In Figure 1 the first guide groove G1 is formed in the second movable body 140, and the second guide groove G2 is formed in the first movable body 110. However, this is only an example. For example, the first guide groove G1 can be formed in both the base 131 and the guide member 141. That is, the first guide groove G1 can be formed on the surfaces of the base 131 and the guide member 141 that face each other in the optical axis (Z-axis) direction. In the example, the first guide groove G1 can be formed in the base 131. In addition, the second guide groove G2 can be formed in both the guide member 141 and the sensor bracket 113. That is, the second guide groove G2 can be formed on the surfaces of the guide member 141 and the sensor bracket 113 that face each other in the optical axis (Z-axis) direction.

[0078] In the example, the second movable body 140 or the guide member 141 can be omitted. For example, the first movable body 110 can move directly on the base 131.

[0079] That is, in Figure 1In [the structure], the second movable body 140 may be omitted, the spherical member may be disposed between the sensor bracket 113 and the base 131, and the sensor bracket 113 and / or the base 131 may include a guide groove for accommodating the spherical member.

[0080] Figures 2A to 2C A traction unit according to one or more embodiments is shown.

[0081] The first movable body 110 may move only in a direction orthogonal to the optical axis (Z-axis) and may not move in a direction parallel to the optical axis (Z-axis). Additionally, the first movable body 110 and the second movable body 140 may respectively maintain contact with the first spherical member B1 and the second spherical member B2. Thus, the sensor displacement actuator 100 may include a traction unit.

[0082] First, referring to Figure 2A , the traction unit may include a first magnetic member 124 and second magnetic members 125 and 126 that are arranged to face each other in the optical axis (Z-axis) direction. Magnetic attraction may act between the first magnetic member 124 and the second magnetic members 125 and 126. For example, the first magnetic member 124 may be a permanent magnet, and the second magnetic members 125 and 126 may be yokes. In another example, both the first magnetic member 124 and the second magnetic members 125 and 126 may be permanent magnets.

[0083] In an example, the first magnetic member 124, which is a permanent magnet, may be disposed on the second movable body 140 provided between the first movable body 110 and the fixed body 130. Additionally, the second magnetic members 125 and 126 may be respectively disposed at positions on the first movable body 110 and the fixed body 130 that face the first magnetic member 124 in the optical axis (Z-axis) direction.

[0084] Referring to Figure 1 and Figure 2A , the first movable body 110 and the fixed body 130 are respectively pulled toward the second movable body 140 by the magnetic force generated between the first magnetic member 124 and the corresponding second magnetic members 125 and 126, and the first spherical member B1 and the second spherical member B2 may respectively roll in close contact with the first guide groove G1 and the second guide groove G2.

[0085] When the second movable body 140 is omitted, the first magnetic member 124 and the second magnetic member 125 may be respectively mounted on the sensor bracket 113 and the base 131 such that the magnetic force therebetween may pull the sensor bracket 113 toward the base 131 (i.e., in the -Z direction).

[0086] Referring to Figure 2B and Figure 2C, either the first magnetic member 124 or the second magnetic member 125 may be disposed on the fixed body 130, and the other of the first magnetic member 124 and the second magnetic member 125 may be disposed on the first movable body 110.

[0087] Even in this example, the first movable body 110 can be pulled toward the fixed body 130 by the magnetic force generated between the first magnetic member 124 and the second magnetic member 125.

[0088] In Figure 2B In the example shown in, the second movable body 140 is disposed between the first magnetic member 124 and the second magnetic member 125. In contrast, in Figure 2C In the example shown in, a through hole 142 may be provided in the second movable body 140 such that the first magnetic member 124 and the second magnetic member 125 can directly face each other in the optical axis (Z-axis) direction.

[0089] Referring again to Figure 1 , in the example, the drive unit 120 includes a coil unit 122 coupled to any one of the first movable body 110 and the fixed body 130 and a movable yoke unit 121 coupled to the other of the first movable body 110 and the fixed body 130.

[0090] In the example, the coil unit 122 may be coupled to the base 131, and the movable yoke unit 121 may be coupled to the sensor bracket 113. The movable yoke unit 121 and the coil unit 122 face each other in a direction orthogonal to the optical axis (Z-axis). The electromagnetic interaction between the movable yoke unit 121 and the coil unit 122 causes the first movable body 110 to move relative to the fixed body 130 in a direction orthogonal to the optical axis (Z-axis).

[0091] In the example, the drive unit 120 may further include a back yoke unit 123 disposed on one side of the coil unit 122. The back yoke unit 123 enables the magnetic field generated in the coil unit 122 to be concentrated only in the direction toward the movable yoke unit 121. Since the back yoke unit 123 can be disposed on one side of the coil unit 122, the magnetic field generated by the coil unit 122 can be prevented or minimized from affecting other electronic components. The back yoke unit 123 may be disposed between the base 131 and the coil unit 122.

[0092] In one or more examples, the coil unit 122 may be coupled to the fixed body 130, and the movable yoke unit 121 may be coupled to the first movable body 110. However, this is for ease of description, and in another example, the coil unit 122 may be coupled to the first movable body 110, and the movable yoke unit 121 may be coupled to the fixed body 130.

[0093] An air gap may be formed between the coil unit 122 and the movable yoke unit 121 facing each other. For example, a space may be formed between the coil unit 122 and the movable yoke unit 121 facing each other. That is, there may be no other components (e.g., magnets) between the coil unit 122 and the movable yoke unit 121 facing each other. The coil unit 122 and the movable yoke unit 121 may face each other directly with an air gap therebetween.

[0094] In an example, the driving unit 120 may not include a permanent magnet. In an example, when no current flows in the coil unit 122, the magnetic field caused by the movable yoke unit 121 may be 0 (zero) or at a very low level. Therefore, the magnetic field caused by the driving unit 120 itself can be prevented or minimized from affecting other electronic components (e.g., other electronic components within the camera module or electronic components within another camera module).

[0095] In an example, the movable yoke unit 121 may be formed of a soft magnetic material. The soft magnetic material has a small coercive force and is magnetized when exposed to a magnetic field, but loses magnetism or has a relatively low level of magnetism when the magnetic field disappears.

[0096] When a current is applied to the coil unit 122, the movable yoke unit 121 is magnetized, thereby generating a magnetic drag force between the coil unit 122 and the movable yoke unit 121. An attractive force is generated in the direction in which the movable yoke unit 121 and the coil unit 122 face each other, such that the first movable body 110 moves relative to the fixed body 130 in the corresponding direction.

[0097] Figure 3 is a schematic plan view of a sensor displacement actuator according to one or more embodiments.

[0098] Reference Figure 3 , the coil unit 122 includes a first coil 122a, a second coil 122b, a third coil 122c, and a fourth coil 122d, and the movable yoke unit 121 includes a first movable yoke 121a, a second movable yoke 121b, a third movable yoke 121c, and a fourth movable yoke 121d. In addition, the rear yoke unit 123 includes a first rear yoke 123a, a second rear yoke 123b, a third rear yoke 123c, and a fourth rear yoke 123d.

[0099] The first coil 122a to the fourth coil 122d of the coil unit 122 may each be disposed on the inner surface of the base 131. The first coil 122a and the second coil 122b may be spaced apart from each other in a first direction (e.g., the X direction), and the third coil 122c and the fourth coil 122d may be spaced apart from each other in a second direction (e.g., the Y direction). Accordingly, the direction in which the first coil 122a and the second coil 122b are spaced apart from each other is orthogonal to the direction in which the third coil 122c and the fourth coil 122d are spaced apart from each other.

[0100] The first movable yoke 121a to the fourth movable yoke 121d may be disposed on the outer surface of the sensor bracket 113 to face the first coil 122a to the fourth coil 122d, respectively.

[0101] When a current is applied to the first coil 122a, an attractive force is generated between the first coil 122a and the first movable yoke 121a, and this attractive force may move the first movable body 110 in the -X direction. Conversely, when a current is applied to the second coil 122b, an attractive force is generated between the second coil 122b and the second movable yoke 121b, and this attractive force may move the first movable body 110 in the +X direction.

[0102] In addition, when a current is applied to the third coil 122c, an attractive force is generated between the third coil 122c and the third movable yoke 121c, and this attractive force may move the first movable body 110 in the +Y direction. Conversely, when a current is applied to the fourth coil 122d, an attractive force is generated between the fourth coil 122d and the fourth movable yoke 121d, and this attractive force may move the first movable body 110 in the -Y direction.

[0103] The driving unit 120 may include a plurality of unit driving units 120a, 120b, 120c, and 120d. Each of the plurality of unit driving units 120a, 120b, 120c, and 120d may include a movable yoke and a coil facing each other.

[0104] Since an attractive force is generated only between the facing coil and the movable yoke, at least two unit driving units are required to reciprocate the first movable body 110 in any direction.

[0105] Reference Figure 3 , to correct the jitter in the X direction, the driving unit 120 may include a first unit driving unit 120a disposed in the -X direction of the first movable body 110 and a second unit driving unit 120b disposed in the +X direction of the first movable body 110.

[0106] The first unit drive unit 120a may include a first movable yoke 121a coupled to the sensor bracket 113 and a first coil 122a coupled to the base 131. The second unit drive unit 120b may include a second movable yoke 121b coupled to the sensor bracket 113 and a second coil 122b coupled to the base 131.

[0107] To correct for jitter in the Y direction, the drive unit 120 may include a third unit drive unit 120c disposed in the +Y direction of the first movable body 110 and a fourth unit drive unit 120d disposed in the -Y direction of the first movable body 110.

[0108] The third unit drive unit 120c may include a third movable yoke 121c coupled to the sensor bracket 113 and a third coil 122c coupled to the base 131. The fourth unit drive unit 120d may include a fourth movable yoke 121d coupled to the sensor bracket 113 and a fourth coil 122d coupled to the base 131.

[0109] Figures 4A to 4D The state in which the first movable body 110 moves is schematically illustrated.

[0110] Reference Figure 4A , when a current is applied to the first coil 122a, the first coil 122a may pull the first movable yoke 121a in the direction of the arrow, which may move the first movable body 110 in the -X direction.

[0111] Reference Figure 4B , when a current is applied to the second coil 122b, the second coil 122b may pull the second movable yoke 121b in the direction of the arrow, which may move the first movable body 110 in the +X direction.

[0112] Reference Figure 4C , when a current is applied to the third coil 122c, the third coil 122c may pull the third movable yoke 121c in the direction of the arrow, which may move the first movable body 110 in the +Y direction.

[0113] Reference Figure 4D , when a current is applied to the fourth coil 122d, the fourth coil 122d may pull the fourth movable yoke 121d in the direction of the arrow, which may move the first movable body 110 in the -Y direction.

[0114] Figure 5 An example in which the position of the drive unit is changed in the sensor displacement actuator according to one or more embodiments is shown.

[0115] Reference Figure 5, a plurality of unit drive units 120a, 120b, 120c, and 120d can be arranged in a direction diagonal to the driving direction of the image sensor 111.

[0116] In the example, the first movable body 110 can move in two directions that are orthogonal to the optical axis (Z-axis) and orthogonal to each other. For example, the first movable body 110 can move in the X direction and the Y direction.

[0117] The image sensor 111 can include a horizontal side 111b extending in the X direction and a vertical side 111c extending in the Y direction, and the first guide groove G1 and the second guide groove G2 can extend in the X direction and the Y direction, respectively.

[0118] A plurality of unit drive units 120a, 120b, 120c, and 120d can be provided in a direction orthogonal to the optical axis (Z-axis), and can cross two mutually orthogonal moving directions (X direction and Y direction).

[0119] For example, the first unit drive unit 120a and the second unit drive unit 120b can be arranged to be spaced apart from each other in the first diagonal direction D1 of the image sensor 111. The third unit drive unit 120c and the fourth unit drive unit 120d can be arranged to be spaced apart from each other in the second diagonal direction D2 of the image sensor 111.

[0120] In the example, each coil and each movable yoke of each of the drive units can face each other in a direction between the first direction (e.g., X direction) and the second direction (e.g., Y direction). For example, when the drive unit 120 is configured to move the first movable body 110 in the first direction (e.g., X direction) and the second direction (e.g., Y direction), each coil and each movable yoke can face each other in directions D1 and D2 that form a 45-degree angle with the X-axis or the Y-axis.

[0121] Figures 6A to 6D Schematically shows the state of movement of the first movable body in the arrangement of the drive units as shown in Figure 5 as shown.

[0122] Refer to Figure 6A , when current is applied to the first coil 122a and the fourth coil 122d, the first coil 122a and the fourth coil 122d can pull the first movable yoke 121a and the fourth movable yoke 121d in the directions of their respective arrows, and thus, the first movable body 110 can move in the -X direction.

[0123] Refer to Figure 6B, when current is applied to the second coil 122b and the third coil 122c, the second coil 122b and the third coil 122c can pull the second driving yoke 121b and the third driving yoke 121c in the directions of their respective arrows, and thus, the first movable body 110 can move in the +X direction.

[0124] Reference Figure 6C , when current is applied to the first coil 122a and the third coil 122c, the first coil 122a and the third coil 122c can pull the first driving yoke 121a and the third driving yoke 121c in the directions of their respective arrows, and thus, the first movable body 110 can move in the +Y direction.

[0125] Reference Figure 6D , when current is applied to the second coil 122b and the fourth coil 122d, the second coil 122b and the fourth coil 122d can pull the second driving yoke 121b and the fourth driving yoke 121d in the directions of their respective arrows, and thus, the first movable body 110 can move in the -Y direction.

[0126] Figure 7A and Figure 7B shows Figure 3 Examples also include examples of a position sensing unit, and Figure 8 is a view showing a sensing yoke unit and a sensing coil of a position sensing unit according to one or more embodiments.

[0127] Reference Figure 7A 、 Figure 7B and Figure 8 , according to one or more embodiments, the sensor shift actuator 100 may further include a position sensing unit 160.

[0128] For example, when the first movable body 110 moves in a first direction (e.g., the X direction), the position of the first movable body 110 can be sensed by the position sensing unit 160, and when the first movable body 110 can move in a second direction (e.g., the Y direction), the position of the first movable body 110 can be sensed by the position sensing unit 160.

[0129] The position sensing unit 160 includes a first position sensor 170 and a second position sensor 180. The first position sensor 170 can be used to detect the position of the first movable body 110 in the first direction (e.g., the X direction), and the second position sensor 180 can be used to detect the position of the first movable body 110 in the second direction (e.g., the Y direction).

[0130] The first position sensor 170 includes a first sensing coil 172 and a first sensing yoke unit 171. One of the first sensing coil 172 and the first sensing yoke unit 171 may be disposed on the first movable body 110, and the other of the first sensing coil 172 and the first sensing yoke unit 171 may be disposed on the fixed body 130. In an example, the first sensing yoke unit 171 may be disposed on the sensor bracket 113, and the first sensing coil 172 may be disposed on the base 131. Accordingly, the first sensing yoke unit 171 may be a movable member that moves together with the sensor bracket 113.

[0131] The first sensing coil 172 and the first sensing yoke unit 171 may be arranged to face each other in a direction orthogonal to the optical axis (Z-axis). In an example, the first sensing coil 172 and the first sensing yoke unit 171 may be arranged to face each other in a second direction (Y-direction).

[0132] The first sensing yoke unit 171 may include a first sensing yoke 171a and a second sensing yoke 171b that are spaced apart from each other.

[0133] The second position sensor 180 includes a second sensing coil 182 and a second sensing yoke unit 181. One of the second sensing coil 182 and the second sensing yoke unit 181 may be disposed on the first movable body 110, and the other of the second sensing coil 182 and the second sensing yoke unit 181 may be disposed on the fixed body 130. In an example, the second sensing yoke unit 181 may be disposed on the sensor bracket 113, and the second sensing coil 182 may be disposed on the base 131. Accordingly, the second sensing yoke unit 181 may be a movable member that moves together with the sensor bracket 113.

[0134] The second sensing coil 182 and the second sensing yoke unit 181 may be arranged to face each other in a direction orthogonal to the optical axis (Z-axis). In an example, the second sensing coil 182 and the second sensing yoke unit 181 may be arranged to face each other in a first direction (e.g., X-direction).

[0135] The second sensing yoke unit 181 may include a third sensing yoke 181a and a fourth sensing yoke 181b that are spaced apart from each other.

[0136] Since the configurations and sensing methods of the first position sensor 170 and the second position sensor 180 are the same, for ease of description, only the first position sensor 170 will be described below.

[0137] The inductance of the first sensing coil 172 may vary according to a change in the position of the first sensing yoke unit 171.

[0138] Specifically, when the first sensing yoke unit 171 moves in one direction, the magnitude of the eddy current of the first sensing yoke unit 171 that affects the inductance of the first sensing coil 172 can change, the intensity of the magnetic field can change according to the eddy current, and thus, the inductance of the first sensing coil 172 can change.

[0139] The first sensing yoke unit 171 can be a conductor or a magnetic material.

[0140] The sensor displacement actuator 100 can determine the displacement of the first movable body 110 based on the change in the inductance of the first sensing coil 172. For example, the sensor displacement actuator 100 can further include at least one capacitor, and the at least one capacitor and the first sensing coil 172 can form a predetermined oscillation circuit.

[0141] For example, the at least one capacitor can be set to correspond to the number of the first sensing coils 172, and one capacitor and one first sensing coil 172 can be configured in the same form as a predetermined LC oscillator, and in addition, the at least one capacitor and the first sensing coils 172 can be configured in the form of a typical Colpitts oscillator.

[0142] The sensor displacement actuator 100 can determine the displacement of the first movable body 110 based on the change in the frequency of the oscillation signal generated by the oscillation circuit. Specifically, when the inductance of the first sensing coil 172 forming the oscillation circuit changes, the frequency of the oscillation signal generated by the oscillation circuit can be changed, and thus, the displacement of the first movable body 110 can be detected based on the change in the frequency.

[0143] Reference Figure 8 , the first sensing yoke unit 171 can include a first sensing yoke 171a and a second sensing yoke 171b.

[0144] In an example, the first sensing yoke unit 171 can further include a support member 171c on which the first sensing yoke 171a and the second sensing yoke 171b are disposed. The support member 171c can be attached to the sensor bracket 113.

[0145] In an example, the first sensing yoke 171a and the second sensing yoke 171b can be attached to the support member 171c. In another example, by way of example only, the first sensing yoke 171a and the second sensing yoke 171b can be manufactured integrally with the support member 171c by an insert injection method.

[0146] However, one or more examples are not limited thereto, and the first sensing yoke unit 171 may not include the support member 171c. In this example, by way of example only, the first sensing yoke 171a and the second sensing yoke 171b may be directly attached to the sensor bracket 113, or may be manufactured integrally with the sensor bracket 113 by an insert injection method.

[0147] The first sensing yoke 171a and the second sensing yoke 171b may be arranged to be spaced apart from each other in the optical axis (Z-axis) direction. In addition, each sensing yoke may be arranged to face a part of the first sensing coil 172. For example, the first sensing yoke 171a and the second sensing yoke 171b may be respectively arranged to face the first sensing coil 172 in the second direction (e.g., the Y direction).

[0148] The direction of the current flowing in the part of the first sensing coil 172 facing the first sensing yoke 171a may be different from the direction of the current flowing in the part of the first sensing coil 172 facing the second sensing yoke 171b. In an example, the direction of the current flowing in the part of the first sensing coil 172 facing the first sensing yoke 171a may be opposite to the direction of the current flowing in the part of the first sensing coil 172 facing the second sensing yoke 171b.

[0149] The distance between the first sensing yoke 171a and the second sensing yoke 171b in the optical axis (Z-axis) direction may be shorter than the distance between the two ends of the first sensing coil 172 in the optical axis (Z-axis) direction.

[0150] Each of the first sensing yoke 171a and the second sensing yoke 171b may be arranged to move together with the first movable body 110, and may have a width that varies according to the coordinates of the direction (e.g., the X direction) in which the first movable body 110 moves.

[0151] The first sensing yoke 171a and the second sensing yoke 171b may each output magnetic flux due to eddy currents. The magnitude of the eddy currents and the magnitude of the magnetic flux may depend on each other.

[0152] The magnitude of the eddy currents that may be formed in each of the first sensing yoke 171a and the second sensing yoke 171b may depend on the width of the parts of the first sensing yoke 171a and the second sensing yoke 171b that face the first sensing coil 172.

[0153] In an example, since the first sensing coil 172 may move in the first direction (e.g., the X direction) from the perspective of the first sensing yoke 171a and the second sensing yoke 171b, the magnitude of the eddy currents that may be formed in each of the first sensing yoke 171a and the second sensing yoke 171b may depend on the relative movement of the first sensing coil 172 in the first direction (e.g., the X direction).

[0154] Since the inductance of the first sensing coil 172 can be the sum or difference of the mutual inductance caused by the magnetic flux and the self-inductance of the first sensing coil 172, the inductance of the first sensing coil 172 can vary according to the magnitude of the magnetic flux caused by the eddy current. The position of the first movable body 110 can be sensed based on the inductance of the first sensing coil 172.

[0155] Since the change in the magnitude of the eddy current according to the moving displacement of the first movable body 110 in each of the first sensing yoke 171a and the second sensing yoke 171b becomes linear, the position of the first movable body 110 can be sensed more precisely.

[0156] Each of the first sensing yoke 171a and the second sensing yoke 171b can have a width that repeatedly increases or decreases in the direction in which the first movable body 110 moves (e.g., the X direction). The width refers to the width in the optical axis (Z axis) direction.

[0157] For example, the width of the first sensing yoke 171a can have a width that repeatedly decreases - increases - decreases - increases in the first direction (e.g., the X direction). The second sensing yoke 171b can have a width that repeatedly decreases - increases - decreases - increases - decreases in the first direction (e.g., the X direction).

[0158] Each of the first sensing yoke 171a and the second sensing yoke 171b can have a width that increases or decreases in one direction, and the first sensing yoke 171a and the second sensing yoke 171b can have a configuration in which the positions where the width increases and decreases are different.

[0159] Each of the first sensing yoke 171a and the second sensing yoke 171b can have a plurality of minimum widths and a plurality of maximum widths.

[0160] The boundary line defining the width of each sensing yoke can have a sine wave shape.

[0161] The winding thickness of the first sensing coil 172 can be greater than the minimum width of each sensing yoke and less than the maximum width of each sensing yoke.

[0162] The position where the first sensing yoke 171a has the minimum width is different from the position where the second sensing yoke 171b has the minimum width. In addition, the position where the first sensing yoke 171a has the maximum width is different from the position where the second sensing yoke 171b has the maximum width.

[0163] Therefore, the coordinates of the first movable body 110 in one direction (e.g., the X direction) corresponding to the maximum width (the maximum width in the optical axis (Z axis) direction) of the first sensing yoke 171a may be different from the coordinates of the first movable body 110 in one direction (e.g., the X direction) corresponding to the maximum width (the maximum width in the optical axis (Z axis) direction) of the second sensing yoke 171b.

[0164] In the example, the X-direction coordinates corresponding to the minimum width W1 of the first sensing yoke 171a of the first movable body 110 and the X-direction coordinates corresponding to the minimum width of the second sensing yoke 171b may be different from each other, and the X-direction coordinates corresponding to the maximum width W2 of the first sensing yoke 171a of the first movable body 110 and the X-direction coordinates corresponding to the maximum width of the second sensing yoke 171b may be different from each other.

[0165] Therefore, the influence of the displacement of the first sensing yoke 171a in one direction on the eddy current magnitude of the first sensing yoke 171a according to the change pattern of the relative movement of the first sensing yoke 171a and the influence of the displacement of the second sensing yoke 171b in one direction on the eddy current magnitude of the second sensing yoke 171b according to the change pattern of the relative movement of the second sensing yoke 171b may be complementary to each other.

[0166] Therefore, the inductance of the first sensing coil 172 can change more stably according to the combination of the inductance change factor according to the eddy current magnitude change of the first sensing yoke 171a and the inductance change factor according to the eddy current magnitude change of the second sensing yoke 171b, and thus, the sensor displacement actuator 100 according to the example can detect the movement of the first movable body 110 more stably and / or more precisely, and detect the movement of the first movable body 110 more linearly and / or more effectively.

[0167] The length of the first sensing yoke 171a in the first direction (e.g., the X direction) may be one or more cycles of the width of the first sensing yoke 171a, and the length of the second sensing yoke 171b in the first direction (e.g., the X direction) may be one or more cycles of the width of the second sensing yoke 171b.

[0168] The width of each of the first sensing yoke 171a and the second sensing yoke 171b may repeat once every 1 cycle. The length of the width of each of the first sensing yoke 171a and the second sensing yoke 171b in the first direction (e.g., the X direction) may vary according to the movement sensing range of the first movable body 110.

[0169] Due to the difference between the coordinates in one direction (e.g., the X direction) corresponding to the maximum width of the first sensing yoke 171a of the first movable body 110 and the coordinates in one direction (e.g., the X direction) corresponding to the maximum width of the second sensing yoke 171b of the first movable body 110, the output value of the first sensing coil 172 according to the movement of each sensing yoke can be a sine wave with a 90-degree phase difference.

[0170] Therefore, the output value obtained by performing the arctangent process on the output of the sine wave with a 90-degree phase difference can be linear with respect to the movement of the first movable body 110.

[0171] As an example, each of the first sensing yoke 171a and the second sensing yoke 171b may include at least one of copper, silver, gold, and aluminum. Since copper, silver, gold, and aluminum have relatively high conductivity, the eddy currents formed in the first sensing yoke 171a and the second sensing yoke 171b can increase according to the total magnitude of the magnetic flux of the first sensing coil 172, and the movement detection sensitivity of the first movable body 110 can be further improved.

[0172] In one or more examples, the first sensing coil 172 may be configured as a plurality of sensing coils, and the inductance change factor according to the change in the eddy current magnitude of the first sensing yoke 171a and the inductance change factor according to the change in the eddy current magnitude of the second sensing yoke 171b are respectively applied to the plurality of sensing coils. In this example, the first sensing yoke 171a and the second sensing yoke 171b may be arranged to face different sensing coils.

[0173] Since the inductance of each of the plurality of sensing coils is used together to generate information about the movement of the first movable body 110, the inductance change factor according to the change in the eddy current magnitude of the first sensing yoke 171a and the inductance change factor according to the change in the eddy current magnitude of the second sensing yoke 171b can be used as a whole, and the sensor displacement actuator 100 according to the example can detect the movement of the first movable body 110 more linearly.

[0174] Figure 9A and Figure 9B are diagrams showing changes in the positional relationship according to the movement of the first movable body between the first sensing yoke unit and the first sensing coil in the position sensing unit according to one or more embodiments.

[0175] Reference Figure 9A and Figure 9B Since the width of the first sensing yoke unit 171 changes along the movement direction of the first movable body 110, the overlapping area between the first sensing yoke unit 171 and the first sensing coil 172 in the second direction (e.g., the Y direction) changes according to the movement of the first movable body 110.

[0176] The widths of the portions of the first sensing yoke 171a and the second sensing yoke 171b that overlap the first sensing coil 172 in the second direction (e.g., the Y direction) may vary according to the movement of the first sensing yoke 171a and the second sensing yoke 171b in the first direction (e.g., the X direction). Accordingly, the inductance of the first sensing coil 172 may vary according to the movement of the first movable body 110 in the first direction (e.g., the X direction), and the movement of the first movable body 110 in the first direction (e.g., the X direction) may be sensed.

[0177] Figure 10 is a graph showing the inductance of a first sensing coil according to the movement of a first movable body in one direction.

[0178] Reference Figure 10 , the period of the width of the first sensing yoke 171a may correspond to a phase of 360 degrees.

[0179] When a specific region of the first sensing coil 172 (e.g., the center of the first sensing coil 172) overlaps with the minimum width of the first sensing yoke 171a, the normalized inductance of the first sensing coil 172 may have a maximum value.

[0180] When a specific region of the first sensing coil 172 (e.g., the center of the first sensing coil 172) overlaps with the maximum width of the first sensing yoke 171a, the normalized inductance of the first sensing coil 172 has a minimum value.

[0181] In an example, normalization may be a value obtained by applying a specific weight to the inductance.

[0182] Figure 11A is a graph showing a plurality of inductances of a first sensing coil corresponding to each of a first sensing yoke and a second sensing yoke of a sensor shift actuator according to one or more embodiments.

[0183] Reference Figure 11A , the phase difference between a first inductance L1 of the first sensing coil 172 corresponding to the first sensing yoke 171a and a second inductance L2 of the first sensing coil 172 corresponding to the second sensing yoke 171b may be 90 degrees. In an example, the inductance may be a value obtained by subtracting a specific value from the normalized inductance such that the average value is 0.

[0184] Figure 11B is a graph showing Figure 11A the arctangent processing values of the plurality of inductances shown in

[0185] Reference Figure 11B , the arctangent processing values may linearly vary in terms of phase change.

[0186] When the first inductor L1 and the second inductor L2 have a 90-degree phase difference from each other, one of the first inductor L1 and the second inductor L2 can correspond to {sin(phase)}, and the other can correspond to {cos(phase)}.

[0187] In the triangular model, the angle pointing from the origin to a point on the circle can correspond to the phase of one period of the sensing yoke. The distance from the origin to a point on the circle is r, and the X-direction vector value and the Y-direction vector value from the origin to a point on the circle can be X and Y, respectively.

[0188] {sin(phase)} is (y / r), {cos(phase)} is (x / r). {tan(phase)} is (y / x), {sin(phase)} / {cos(phase)}, and (the second inductor) / (the first inductor).

[0189] Therefore, arctan{(the second inductor) / (the first inductor)} can correspond to the phase of one period of the displacement recognition layer and can be the arctangent processing value.

[0190] Figure 12 is a schematic cross-sectional view of an exemplary camera module according to one or more embodiments.

[0191] Reference Figure 12 , according to one or more embodiments, the camera module 10 includes a lens module 200, a housing 300 that houses the lens module 200, and a sensor shift actuator 100.

[0192] At least one lens for imaging an object can be housed in the lens module 200. When a plurality of lenses are arranged in the lens module 200, the plurality of lenses can be mounted along the optical axis (Z-axis) within the lens module 200.

[0193] The lens module 200 can have a hollow cylindrical shape.

[0194] In an example, the lens module 200 can include a lens barrel and a lens holder. In this example, at least one lens can be housed in the lens barrel, and the lens barrel can be coupled to the lens holder.

[0195] The housing 300 houses the lens module 200, and the housing 300 is coupled to the sensor shift actuator 100.

[0196] The sensor shift actuator 100 can be the sensor shift actuator 100 according to the above example.

[0197] An image sensor 111 can be provided in the sensor shift actuator 100, and the image sensor 111 can be moved in a first direction (e.g., the X direction) and a second direction (e.g., the Y direction) by a driving unit 120.

[0198] Therefore, the shake correction function (i.e., optical image stabilization) can be performed by moving the image sensor 111.

[0199] The camera module 10 according to one or more embodiments can perform shake correction by moving the image sensor 111 instead of the lens module 200. Since the relatively light image sensor 111 is moved, the image sensor 111 can be moved with a smaller driving force. Accordingly, the form factor of the camera module 10 can be miniaturized.

[0200] Figure 13 is a schematic cross-sectional view of a camera module according to one or more embodiments.

[0201] Reference Figure 13 , the camera module 20 according to one or more embodiments includes a housing 300, a reflection member R, a lens module 200, and a sensor shift actuator 100.

[0202] In an example, the optical axis (Z-axis) of the lens module 200 may be parallel to a direction orthogonal to the thickness direction of the portable electronic device (the direction from the front surface to the back surface of the portable electronic device or the opposite direction).

[0203] For example, the optical axis (Z-axis) of the lens module 200 may be formed in the width direction or the length direction of the portable electronic device.

[0204] If the components constituting the camera module are stacked in the thickness direction of the portable electronic device, the thickness of the portable electronic device may increase.

[0205] However, in the exemplary camera module 20, since the optical axis (Z-axis) of the lens module 200 is formed in the width direction or the length direction of the portable electronic device, the thickness of the portable electronic device can be reduced.

[0206] The reflection member R and the lens module 200 are disposed within the housing 300. However, this is merely an example, and the reflection member R and the lens module 200 may be disposed in separate housings, and the respective housings may be coupled to each other.

[0207] The reflection member R is configured to change the traveling direction of light. For example, the traveling direction of light incident into the housing 300 may be changed toward the lens module 200 by the reflection member R. The reflection member R may be a mirror or a prism that reflects light.

[0208] The sensor shift actuator 100 is coupled to the housing 300.

[0209] The sensor shift actuator 100 may be the sensor shift actuator 100 according to one or more of the above embodiments.

[0210] The image sensor 111 may be disposed on the sensor shift actuator 100, and the image sensor 111 may move in a first direction (e.g., the X direction) and a second direction (e.g., the Y direction).

[0211] Since the image sensor 111 can move in the first direction (e.g., the X direction) and the second direction (e.g., the Y direction), a shake correction function (optical image stabilization) can be performed by the movement of the image sensor 111.

[0212] As described above, the exemplary sensor shift actuator can improve shake correction performance.

[0213] Although the present disclosure includes specific examples, it will be apparent to those of ordinary skill in the art that after understanding the disclosure of the present application, various changes in form and detail can be made in these examples without departing from the spirit and scope of the claims and their equivalents. The examples described herein are considered in a descriptive sense only and not for purposes of limitation. The description of a feature or aspect in each example is considered applicable to similar features or aspects in other examples. Suitable results can also be achieved if the described techniques are performed in a different order, and / or if the components in the described system, architecture, device, or circuit are combined in a different manner, and / or replaced or supplemented by other components or their equivalents. Accordingly, the scope of the present disclosure is not limited by the detailed description, but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents will be construed as being included in the present disclosure.

Claims

1. A sensor shift actuator, comprising: A first movable body in which an image sensor having an imaging surface is provided; A fixed body in which the first movable body is arranged to be movable in a first direction parallel to the imaging surface and a second direction parallel to the imaging surface; A driving unit configured to provide a driving force to the first movable body; And A position sensing unit configured to sense the position of the first movable body, and including a sensing coil provided on any one of the first movable body and the fixed body and a sensing yoke unit provided on the other of the first movable body and the fixed body, wherein the sensing yoke unit and the sensing coil face each other; Wherein the sensing yoke unit includes a plurality of sensing yokes spaced apart from each other in a direction orthogonal to the imaging surface, and each sensing yoke is configured to have a width that varies in the moving direction of the first movable body.

2. The sensor shift actuator according to claim 1, wherein: Each of the plurality of sensing yokes includes a first sensing yoke and a second sensing yoke, and The first sensing yoke and the second sensing yoke each face the sensing coil in a direction parallel to the imaging surface.

3. The sensor shift actuator according to claim 2, wherein, The first sensing yoke and the second sensing yoke each have a width that increases and decreases in the moving direction of the first movable body, and the positions where the widths of the first sensing yoke and the second sensing yoke increase or decrease are different.

4. The sensor shift actuator according to claim 3, wherein: The first sensing yoke and the second sensing yoke each have a plurality of minimum widths and a plurality of maximum widths, The position where the first sensing yoke has a minimum width is different from the position where the second sensing yoke has a minimum width, and The position where the first sensing yoke has a maximum width is different from the position where the second sensing yoke has a maximum width.

5. The sensor shift actuator according to claim 4, wherein, The winding thickness of the sensing coil is greater than the minimum width of each sensing yoke and less than the maximum width of each sensing yoke.

6. The sensor shift actuator according to claim 1, wherein, The boundary line defining the width of each sensing yoke among the plurality of sensing yokes has a sine wave shape.

7. The sensor shift actuator according to claim 2, wherein, The direction of the current flowing through the portion of the sensing coil facing the first sensing yoke is different from the direction of the current flowing through the portion of the sensing coil facing the second sensing yoke.

8. The sensor shift actuator according to claim 2, wherein, The distance between the first sensing yoke and the second sensing yoke in the direction orthogonal to the imaging surface is less than the distance between the two ends of the sensing coil in the direction orthogonal to the imaging surface.

9. The sensor shift actuator according to claim 1, wherein: The position sensing unit includes a first position sensor configured to sense the position of the first movable body in the first direction and a second position sensor configured to sense the position of the first movable body in the second direction, Wherein the first direction and the second direction are orthogonal to each other.

10. The sensor shift actuator according to claim 9, wherein: The first position sensor includes a first sensing coil provided on the fixed body and a first sensing yoke unit provided on the first movable body, The first sensing coil and the first sensing yoke unit face each other in the second direction. The first sensing yoke unit includes a first sensing yoke and a second sensing yoke spaced apart from each other in a direction orthogonal to the imaging plane. The second position sensor includes a second sensing coil provided on the fixed body and a second sensing yoke unit provided on the first movable body. The second sensing coil and the second sensing yoke unit face each other in the first direction, and The second sensing yoke unit includes a third sensing yoke and a fourth sensing yoke spaced apart from each other in a direction orthogonal to the imaging plane.

11. The sensor displacement actuator according to claim 1, further comprising: A second movable body disposed between the first movable body and the fixed body, wherein the first movable body is capable of moving together with the second movable body in the first direction, and wherein the first movable body is capable of moving relative to the second movable body in the second direction.

12. The sensor displacement actuator according to claim 11, further comprising: A first ball member disposed between the second movable body and the fixed body; and A second ball member disposed between the first movable body and the second movable body, wherein the first ball member is configured to roll in the first direction, and the second ball member is configured to roll in the second direction.

13. The sensor displacement actuator according to claim 12, wherein: A first magnetic member is provided on the second movable body, Second magnetic members are provided at positions facing the first magnetic member on each of the first movable body and the fixed body, and An attractive force acts between the first magnetic member and the second magnetic members.

14. The sensor displacement actuator according to claim 1, wherein: The drive unit includes a coil unit provided on any one of the first movable body and the fixed body and a movable yoke unit provided on the other of the first movable body and the fixed body, and wherein the movable yoke unit is formed of a soft magnetic material that can be magnetized by the magnetic field of the coil unit.

15. The sensor displacement actuator according to claim 14, wherein: The coil unit includes a first coil, a second coil, a third coil, and a fourth coil provided on the fixed body, The movable yoke unit includes a first movable yoke, a second movable yoke, a third movable yoke, and a fourth movable yoke provided on the first movable body, The first coil and the second coil are spaced apart from each other in the first direction, the third coil and the fourth coil are spaced apart from each other in the second direction, and The first movable yoke to the fourth movable yoke are arranged to face the first coil to the fourth coil respectively.

16. The sensor shift actuator according to claim 14, wherein, When power is supplied to the coil unit, the movable yoke unit is magnetized, and when power supply to the coil unit is cut off, the movable yoke unit loses its magnetism.

17. An imaging device, comprising: A camera module, the camera module including: A fixed body; A first movable body configured to move an image sensor in a first direction orthogonal to an optical axis and a second direction orthogonal to the optical axis; A second movable body disposed between the first movable body and the fixed body; A position sensing unit configured to detect positions of the first movable body in the first direction and the second direction; and A lens module including at least one lens, wherein each of the position sensing units includes a sensing coil and a sensing yoke unit, wherein the sensing yoke unit includes a first sensing yoke and a second sensing yoke spaced apart from each other, and wherein each of the first sensing yoke and the second sensing yoke is configured to have a width that continuously increases and decreases along a direction in which the first movable body moves.

18. The imaging device according to claim 17, wherein, A position where the first sensing yoke has a maximum width is different from a position where the second sensing yoke has a maximum width.

19. The imaging device according to claim 17, wherein, Boundary lines defining the width of the first sensing yoke and the width of the second sensing yoke are configured to have a sinusoidal shape.

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