Aperture module and camera module including same

Abstract

A camera module according to an embodiment of the present invention includes an aperture module comprising: a coil part including a plurality of coils; a fixed part on which the coil part is disposed; a ring magnet that faces the coil part and interacts with the coil part to rotate about a first axis; a moving part on which the ring magnet is disposed; and a blade part that is coupled to the fixed part and the moving part to form a variable aperture. The ring magnet includes a plurality of N poles and a plurality of S poles alternately arranged with each other, the blade part includes a plurality of blade layers stacked in a direction parallel to the first axis, each of the plurality of blade layers includes a plurality of blades, the number of coils is greater than the number of blade layers, the sum of the plurality of N poles and the plurality of S poles is greater than the number of coils, and the number of coils, the number of N poles, and the number of blade layers may be multiples of 3.

Description

Aperture module and camera module including the same

[0001] The present invention relates to an aperture module and a camera module including the same, and more specifically, to an aperture module capable of minimizing diffraction phenomena by having nine blades arranged in three layers.

[0002] The following description provides background information regarding the present embodiment and does not describe prior art.

[0003] Recently, cameras have been standardly incorporated into portable electronic devices, including smartphones, tablet PCs, and laptop computers. As competition for product differentiation in portable electronics intensifies, there is an increasing number of cases where the functions of standard digital cameras are applied to the cameras in these devices. Among these, there is a growing demand to obtain bright and clear photos by controlling the amount of light through changing the aperture size using the aperture.

[0004] FIG. 1 is an exemplary illustration showing an aperture (10) having six blades. The light incident aperture (17) formed by the plurality of blades (11 to 16) is symmetrical. That is, as illustrated, it is point-symmetric with respect to the center (A) of the hexagonal light incident aperture (17) formed by the six blades (11 to 16). That is, the first blade (11) is point-symmetric with respect to the fourth blade (14). The rotation axis hole (11a) of the first blade (11) is point-symmetric with respect to the rotation axis hole (14a) of the fourth blade (14) with respect to the line (L1), and the driving hole (11b) of the first blade (11) is point-symmetric with respect to the driving hole (14b) of the fourth blade (14) with respect to the line (L1). The second blade (12) is point-symmetric with the fifth blade (15), and the third blade (13) is point-symmetric with the sixth blade (16). The same can be applied to the rotation axis holes (12a, 13a, 15a, 16a) and driving holes (12b, 13b, 15b, 16b) of each blade (12, 13, 15, 16).

[0005] As a result, diffraction phenomena become more pronounced. This phenomenon occurs not only in aperture modules with six blades as illustrated in Fig. 1, but also in aperture modules equipped with an even number of blades, such as four or eight. Furthermore, if roundness that is as close to a circle as possible is not secured depending on the rotation angle of the blades, diffraction may occur in a straight shape. Additionally, to implement multi-stepping, it is necessary to realize a light incident aperture that is as circular as possible, but the length of the blades increases to improve roundness. For example, in configurations where a total of six blades are arranged with two blades on each of three layers, or where a total of eight blades are arranged with two blades on each of the two layers above and below the intermediate separation layer, overlapping spaces occur between the blades, resulting in a disadvantage of increased thickness of the blade structure. Therefore, there is a need to develop aperture modules that are advantageous for miniaturization and slimming, which are suitable for application in portable electronic devices.

[0006] The present invention aims to provide an aperture module capable of minimizing diffraction phenomena.

[0007] Another objective of the present invention is to provide an aperture module capable of maximizing the roundness of the light incident aperture formed by the rotation of the blade.

[0008] Another objective of the present invention is to provide a thin aperture module that is advantageous for application in portable electronic devices.

[0009] A camera module according to the present invention for achieving such an objective includes an aperture module, wherein the aperture module includes a coil portion comprising a plurality of coils, a fixed portion in which the coil portion is disposed, a ring magnet facing the coil portion and rotating about a first axis in interaction with the coil portion, a moving portion in which the ring magnet is disposed, and a blade portion that forms a variable opening by combining the fixed portion and the moving portion, wherein the ring magnet includes a plurality of N poles and a plurality of S poles arranged alternately with each other, and the blade portion includes a plurality of blade layers stacked in a direction parallel to the first axis, and each of the plurality of blade layers includes a plurality of blades, the number of the plurality of coils is greater than the number of the plurality of blade layers, the sum of the plurality of N poles and the plurality of S poles is greater than the number of the plurality of coils, and the number of the plurality of coils, the number of the plurality of N poles, and the number of the plurality of blade layers may be multiples of 3.

[0010] The aperture module according to the embodiment comprises: a support member including a first opening that overlaps with a lens; a rotor rotatably disposed on the support member about an optical axis and including a second opening that overlaps with the lens and the first opening; and a blade member having nine blades each rotatably disposed in conjunction with the rotation of the rotor and forming three layers in a direction perpendicular to the optical axis to form light incident openings of various sizes.

[0011] In the aperture module according to the present invention, each of the three blades arranged in the same layer in a direction perpendicular to the optical axis may be arranged such that a plurality of virtual lines connecting each rotation axis hole and the optical axis form an angle of 120° with each other.

[0012] In the aperture module according to the present invention, two blades arranged adjacent to each other in the direction of the optical axis can be arranged such that a virtual line connecting the rotation axis hole of the upper layer blade and the optical axis forms an angle of 35° to 45° with a virtual line connecting the rotation axis hole of the lower layer blade and the optical axis.

[0013] In the aperture module according to the present invention, the first angle formed by the first virtual line connecting the rotation axis hole of the blade placed in the lowest layer in the direction of the optical axis and the optical axis, and the second virtual line connecting the rotation axis hole of the blade placed in the middle layer in the direction of the optical axis and the optical axis, may be arranged such that it is different from the second angle formed by the second virtual line connecting the third virtual line connecting the rotation axis hole of the blade placed in the upper layer in the direction of the optical axis and the optical axis.

[0014] In the aperture module according to the present invention, the difference between the first angle and the second angle may be less than 5°.

[0015] In the aperture module according to the present invention, each of the three blades arranged in the same layer in a direction perpendicular to the optical axis does not overlap in the direction of the optical axis throughout the entire range of rotational operation.

[0016] In the aperture module according to the present invention, one blade disposed in the upper layer of the blade portion is supported by constantly overlapping with two blades in the lower layer.

[0017] In the aperture module according to the present invention, each of the nine blades is positioned on the rotor such that the distance between the rotation axis hole and the drive axis hole of each blade is the greatest when the size of the light incident aperture formed by the blade portion is the smallest.

[0018] In the aperture module according to the present invention, each of the nine blades is formed such that the inner surface of the blade body adjacent to the optical axis has a curved portion, and the outer surface of the blade body has at least one inflection portion.

[0019] In the aperture module according to the present invention, when the amount of light incident on the lens is at a maximum value, the amount of light incident on the lens is determined by the inner surface adjacent to each rotation axis hole of each blade, and

[0020] An aperture module in which, as the amount of light incident on the lens decreases from its maximum value, the amount of light incident on the lens is determined by the inner surface of each blade body adjacent to the optical axis.

[0021] An aperture module according to another embodiment of the present invention may comprise: a support member including a first opening that overlaps with a lens; a rotor disposed on the support member so as to be rotatable about an optical axis and including a second opening that overlaps with the lens and the first opening; and a blade member that forms a light incident opening with a left-right asymmetric or up-down asymmetric shape about the optical axis in a direction perpendicular to the optical axis in conjunction with the rotation of the rotor.

[0022] In the aperture module according to the present invention, nine blades are arranged three per layer in three layers so that when the size of the light incident aperture changes, the three blades in each layer do not overlap with each other, so no defects occur during aperture operation. In addition, in the aperture module according to the present invention, the light incident aperture formed by the operation of the blades is asymmetric with respect to the optical axis, so diffraction phenomena are less likely to occur.

[0023] The number of N and S poles of the coils and magnets for driving the blade can be designed as multiples of the blade layers. For example, if the blade consists of three layers, the number of coils in the coil section (800) that drives the blade and the number of S and N poles of the second magnet (710) that drives the blade are also determined as multiples of three. When there are three coils, each blade layer is driven by one coil. When there are six coils, each blade layer is driven by two coils. The same applies to the second magnet (710). When there are three S and N poles of the second magnet (710), each blade layer is driven by one S and one N pole. When there are six S and N poles of the second magnet (710), each blade layer is driven by two S and two N poles. Therefore, the number of coils and magnets required to operate the blade is determined as multiples of the number of blade layers. The number of N and S poles of the magnet mentioned above refers to the number when viewed from a top view, when viewed from a direction parallel to the optical axis. When the blade is composed of four layers, the number of coils of the coil section (800) driving the blade and the number of S and N poles of the second magnet (710) driving the blade are also determined as multiples of 4. The number of N and S poles of the magnet mentioned above refers to the number when viewed from a top view, when viewed from a direction parallel to the optical axis.

[0024] Figure 1 is an example diagram showing an aperture having six blades.

[0025] FIG. 2 is a perspective view illustrating a lens driving device including an aperture module according to one embodiment of the present invention.

[0026] FIG. 3 is an exploded perspective view of the cover of the lens driving device shown in FIG. 2.

[0027] FIG. 4 is an exploded view of the lens driving device (excluding the first to third covers) illustrated in FIG. 3.

[0028] FIGS. 5A to 5C are drawings illustrating an aperture module according to an embodiment of the present invention, where FIG. 5A illustrates a blade portion, FIG. 5B illustrates a moving portion, and FIG. 5C illustrates a fixed portion.

[0029] Figure 6 is a bottom view of the coil portion of the fixed portion of Figure 5c.

[0030] FIGS. 7a to 7d are plan views illustrating the magnetic field interference phenomenon of a lens driving device according to a comparative example.

[0031] FIGS. 8a and 8b are plan views illustrating the magnetic field interference phenomenon of a lens driving device including an aperture module according to an embodiment.

[0032] FIGS. 9a to 9c are bottom views illustrating a plurality of coils, a fixed axis, and a rolling member of an aperture module according to an embodiment.

[0033] FIG. 10 is a perspective view showing the configuration of an aperture module according to the present invention.

[0034] FIG. 11 is an exploded perspective view showing the configuration of an aperture module according to the present invention.

[0035] FIGS. 12a and FIGS. 12b are exemplary diagrams showing the shape according to the operation of the blade portion in an aperture module according to one embodiment of the present invention.

[0036] FIGS. 13a and FIGS. 13b are exemplary diagrams showing the shape according to the operation of the blade portion in an aperture module according to another embodiment of the present invention.

[0037] FIG. 14 is an exemplary diagram showing the shape of a light incident aperture formed by an aperture module according to the present invention.

[0038] FIG. 15 is an example diagram showing the change in the shape of the light incident aperture when the blade constituting the junction module is changed.

[0039] With respect to the embodiments of the present invention disclosed in the text, specific structural or functional descriptions are provided merely for the purpose of explaining the embodiments of the present invention, and the embodiments of the present invention may be implemented in various forms and should not be interpreted as being limited to the embodiments described in the text.

[0040] The present invention is capable of various modifications and may take various forms, and specific embodiments are illustrated in the drawings and described in detail in the text. However, this is not intended to limit the invention to the specific disclosed forms, and it should be understood that the invention includes all modifications, equivalents, and substitutions that fall within the spirit and scope of the invention.

[0041] Terms such as "first," "second," etc., may be used to describe various components, but said components are not limited by said terms. These terms are used solely for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be named the second component, and similarly, the second component may be named the first component.

[0042] When it is stated that one component is "connected" or "connected" to another component, it should be understood that while it may be directly connected or connected to that other component, there may also be other components present in between. Conversely, when it is stated that one component is "directly connected" or "directly connected" to another component, it should be understood that there are no other components present in between. Other expressions describing the relationship between components, such as "between" and "exactly between," or "adjacent to" and "directly adjacent to," should be interpreted in the same way. Likewise, the meaning of "placed on" may imply that it is placed directly on the surface of a component or placed above it at a distance from the surface.

[0043] The terms used in this application are used merely to describe specific embodiments and are not intended to limit the invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, terms such as “comprising” or “having” are intended to specify the existence of the disclosed features, numbers, steps, actions, components, parts, or combinations thereof, and should be understood as not precluding the existence or addition of one or more other features, numbers, steps, actions, components, parts, or combinations thereof.

[0044] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as generally understood by those skilled in the art to which the present invention pertains. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and should not be interpreted in an ideal or overly formal sense unless explicitly defined in this application.

[0045] The following description does not cover all components necessary for the aperture and lens driving device, and even for the described configurations, only the parts necessary for the implementation of the present invention are described. Matters not specifically described in this description may be replaced by configurations known to those skilled in the art or by known technical configurations.

[0046] In the drawings, for convenience, the Cartesian coordinate system (x-axis, y-axis, z-axis) is used for explanation. However, it is not necessarily limited to this, and it is understood that it can also be explained using other coordinate systems. According to the Cartesian coordinate system, the x-axis, y-axis, and z-axis are orthogonal to each other, but the embodiments are not limited to this. That is, the x-axis, y-axis, and z-axis may intersect each other.

[0047] Here, the x-axis direction may be a concept that includes both the +x-axis and -x-axis directions, the y-axis direction may be a concept that includes both the +y-axis and -y-axis directions, and the z-axis direction may be a concept that includes both the +z-axis and -z-axis directions.

[0048] The optical axis may be the optical axis of the lens mounted on the lens barrel. Alternatively, for example, the optical axis may be an axis perpendicular to the imaging area of ​​the image sensor and passing through the center of the imaging area. The direction of the optical axis is denoted as 'OA', and the direction parallel to or parallel to the optical axis may be referred to as the 'Z-axis direction'. This description is based on the assumption that each component is aligned around the optical axis, and is written under the assumption that the optical axis refers to the center of the aperture of each component. Furthermore, when the direction perpendicular to the optical axis is referred to in this description, it may be a concept that includes the x-axis direction and the y-axis direction. Alternatively, it may be used to refer to the x-axis direction or the y-axis direction, or it may be used to refer to a direction other than the x-axis direction and the y-axis direction.

[0049] Hereinafter, an aperture module according to the present invention will be described with reference to the attached drawings.

[0050] Hereinafter, a lens driving device (20) according to an embodiment of the present invention will be described with reference to FIGS. 2 to 4. FIG. 2 is a perspective view showing a lens driving device (20) including an aperture module (500) according to an embodiment of the present invention, FIG. 3 is an exploded perspective view showing the cover of the lens driving device (20) shown in FIG. 2 exploded, and FIG. 4 is an exploded perspective view of the lens driving device (20) (excluding the first cover (21) to the third cover (23)) shown in FIG. 3.

[0051] Referring to FIGS. 2 and 3, the lens driving device (20) includes a first cover (21) and a second cover (22) that surround a substrate part (30), and a lens module (60) and an aperture module (500) that are positioned to protrude through the opening of the first cover (21). A third cover (23) may be positioned on the upper side of the aperture module (500). The internal space formed by the first cover (21) and the second cover (22) may include a substrate part (30) and a housing (40) positioned on the substrate part (30).

[0052] Referring to FIG. 4, the lens driving device (20) may include a substrate (30) that is stacked or arranged in order based on the z-axis direction, a housing (40), a bobbin disposed within the housing (40), a lens module (60) that is stacked or arranged in order based on the z-axis direction on the bobbin, an aperture module (500), and a third cover (23).

[0053] Additionally, although not shown in the drawing, an upper elastic member may be further included that is divided into multiple parts and coupled to the bobbin and housing (40) to elastically support the movement of the bobbin in a direction parallel to the optical axis.

[0054] Additionally, although not specifically illustrated, the lens driving device (20) of the present invention may include a plurality of coils, a driving magnet, a position sensor, and a sensing magnet, etc., for performing an optical image stabilizer (OIS) and auto-focusing function.

[0055] Here, the image stabilization function refers to a feature that prevents the outline of a captured image from being formed clearly due to vibrations caused by the user's hand shake when capturing a still image. To correct image shaking caused by factors such as the user's hand shake, the lens module (60) can be moved in a direction perpendicular to the optical axis (OA). That is, the image stabilization function compensates for shaking by applying a relative displacement corresponding to the shaking to the lens module (60) when shaking occurs during video recording due to the user's hand shake, etc.

[0056] Additionally, the auto-focusing function refers to automatically focusing the image of a subject onto the image sensor surface. In order to automatically focus the image of a subject, the lens module (60) can be moved in a direction parallel to the optical axis (OA). That is, the auto-focusing function provides the lens module (60) with a displacement to focus on the subject.

[0057] The substrate portion (30) may include a body and a first opening penetrating in the optical axis direction at the center of the body. The first opening may have a length extended in the z-axis direction by a protrusion protruding from the body in the z-axis direction.

[0058] Various circuit devices for driving a plurality of AF magnets (hereinafter, first magnets (31)) and a lens driving device (20) may be arranged in the body of the substrate (30). The various circuit devices may be, for example, an image sensor, an integrated circuit storing an algorithm for performing auto-focusing operation and image stabilization functions, an aperture module control board (810) that provides a signal for controlling the aperture module (500), etc. These are merely examples and are not necessarily required to be included, and other configurations other than those mentioned may be added.

[0059] The housing (40) has a protrusion on the outer side that protrudes in the direction of the -z axis, and the housing (40) can be coupled with the substrate part (30) by the protrusion of the housing (40) to form an internal space between the housing (40) and the substrate part (30). A plurality of first magnets (31) and various circuit devices disposed on the body of the aforementioned substrate part (30) can be disposed in the formed internal space.

[0060] The substrate portion (30) and the housing (40) may include a plurality of insertion grooves into which a plurality of first magnets (31) can be coupled or inserted, and the plurality of first magnets (31) may be placed and fixed within a plurality of spaces formed by the plurality of insertion grooves of each of the substrate portion (30) and the housing (40) coupled in the z-axis direction. The z-axis length of the plurality of spaces may be equal to or greater than the z-axis length of the first magnet (31).

[0061] The housing (40) can be positioned inside the first cover (21) and between the first cover (21) and the bobbin. The housing (40) can accommodate the bobbin inside, and the outer surface of the housing (40) can be spaced apart from the inner surface of the side plate of the first cover (21). Due to the space between the housing (40) and the first cover (21), the housing (40) can move horizontally with respect to the optical axis. Through this, the aforementioned optical image stabilization (OIS) function can be performed.

[0062] The housing (40) may have a hollow column shape overall. For example, the housing (40) may have a polygonal (e.g., square or octagonal) or circular opening, and the opening of the housing (40) may be in the form of a through hole penetrating the housing (40) in the direction of the optical axis.

[0063] A bobbin may be placed inside the housing (40) (e.g., the opening of the housing (40)).

[0064] The bobbin may include an opening for mounting a plurality of lenses or a lens module (60) including a plurality of lenses and a lens barrel.

[0065] The opening of the bobbin may be a through hole that penetrates the bobbin in the direction of the optical axis and extends in the direction of the z-axis, and the shape of the opening of the bobbin may be circular, elliptical, or polygonal, but is not limited thereto.

[0066] A lens may be directly mounted in the opening of the bobbin, but is not limited thereto; in other embodiments, a lens barrel for mounting or coupling at least one lens may be coupled or mounted in the opening of the bobbin. The lens or lens barrel may be coupled to the inner circumference of the bobbin in various ways.

[0067] A coil receiving groove is formed on the back of the bobbin to mount a coil. The coil receiving groove is designed to secure the coil without it detaching from the groove through the use of fixing protrusions or the like.

[0068] A coil placed on the back surface of the bobbin allows the bobbin to move in the direction of the optical axis inside the housing (40) through electromagnetic interaction with a plurality of first magnets (31) placed on the substrate portion (30). Through this, the aforementioned autofocus (AF) function can be performed.

[0069] In order for the bobbin to move in the direction of the optical axis, the N pole (702) and S pole (701) of each first magnet (31) may be positioned in the z-axis direction, and the coil coupled to the bobbin may be positioned to face the side of the first magnet (31) facing the optical axis.

[0070] The lens module (60) may include a plurality of lenses or a lens barrel in which a plurality of lenses are combined.

[0071] A plurality of lenses may include two or more lenses, and each of the plurality of lenses may be sequentially stacked and arranged in the direction of the optical axis within the lens barrel by means of a coupling projection for alignment or self-alignment.

[0072] In the case of FIGS. 2 to 4, the aperture module (500) is shown positioned above the lens module (60), but the embodiment is not limited thereto. The following description of the aperture module (500) may also apply when the aperture module (500) is positioned between multiple lenses.

[0073] Hereinafter, an aperture module (500) according to an embodiment of the present invention will be described with reference to FIGS. 5a to 6. FIGS. 5a to 5c are drawings illustrating an aperture module (500) according to an embodiment of the present invention, FIG. 5a is a drawing illustrating a blade part (300), FIG. 5b is a drawing illustrating a moving part (500-2), FIG. 5c is a drawing illustrating a fixed part (500-3), FIG. 6 is a drawing illustrating a bottom view of the nose part (800) of the fixed part (500-3) of FIG. 5c.

[0074] The aperture module (500) may largely include a blade portion (300), a moving portion (500-2), and a fixed portion (500-3). The third cover (23) may be a part of the aperture module (500).

[0075] The blade portion (300) according to the present invention consists of three layers (300-1L, 300-2L, 300-3L) in a direction perpendicular to the optical axis and is composed of a total of nine blades. Three blades are arranged in each layer. The third blade (313), the sixth blade (316), and the ninth blade (319) are arranged in the first layer (300-1L), which is the lowest layer. The second blade (312), the fifth blade (315), and the eighth blade (318) are arranged in the second layer (300-2L), which is the middle layer. The first blade (311), the fourth blade (314), and the seventh blade (317) are arranged in the third layer (300-3L), which is the uppermost layer.

[0076] The third cover (23) is combined with the fixed part (500-3) to form an internal space, and the blade part (300) and the moving part (500-2) can be arranged in the formed internal space.

[0077] In the aperture module (500), the fixed part (500-3) may be an element or configuration that is directly or indirectly coupled to the lens module (60) and does not rotate with respect to the optical axis. In the aperture module (500), the fixed part (500-3) may be a fixed element or configuration that moves the moving part (500-2) or drives the blade part (300). In the aperture module (500), the fixed part (500-3) may be expressed as a "fixed body."

[0078] Referring to FIG. 5c, the fixed part (500-3) of the aperture module (500) may include a stator (900, Stator, which can be replaced with "stator") and a coil part (800). These are merely examples and are not limited to these configurations, and may further include other configurations, such as a position sensor, a temperature sensor, a fixed member, a reinforcing member, etc. In the present invention, the third cover (23) is described as a separate component, but it may be considered to be included in the fixed part (500-3).

[0079] The stator (900) includes a disc-shaped body containing an opening and a side protruding in the z-axis direction on the outside of the body, and the side and the body include a fixed shaft (901) protruding in the z-axis direction. The fixed shaft (901) protrudes most in the z-axis direction from the stator (900) and forms the rotation center of each of the plurality of blades (311-319) by coupling, connecting, inserting, or penetrating the fixed shaft holes (613) of the plurality of blades (311-319) to be described later.

[0080] The fixed axis (901) is arranged point-symmetrically around the optical axis, and the number of fixed axes (901) may be equal to the number of blades (311~319).

[0081] The space between the fixed axis (901) may include a first space (910) and a second space (920).

[0082] The first space (910) may include a guide groove that provides a path for the cloud member (911), which will be described later, to be positioned and moved. Accordingly, the first space (910) may include a protrusion that protrudes in the direction of the optical axis from the side and has a guide groove positioned therein. The number of the first space (910) may be equal to the number of cloud members (911).

[0083] Unlike the first space (910), the second space (920) may not include a protrusion. At least a portion of each of the plurality of coils (820) of the coil portion (800), which will be described later, may be placed in the second space (920). Accordingly, the number of the second space (920) may be equal to the number of the plurality of coils (820).

[0084] Additionally, the second space (920) may include a through hole through which the substrate (810) of the coil section (800) can pass through the side and body. The substrate (810) of the coil section (800) includes a ring-shaped first substrate (811) on which a plurality of coils (820) are arranged, and a second substrate (812) formed extending from the first substrate (811). A terminal section (812-1) for applying an external voltage to the plurality of coils (820) is arranged on the second substrate (812). This terminal section (812-1) can be directly or indirectly connected to the circuit device of the aforementioned substrate section (30). To this end, the second substrate (812) can pass through the stator (900) through the through hole and be connected to the substrate section (30) or the upper elastic member, etc., which is positioned on the lower side of the aperture module (500).

[0085] Additionally, the body of the stator (900) includes a recessed groove (930) that is recessed in the -z-axis direction. The recessed groove (930) may contain at least a portion of a sensor (e.g., a position sensor (830), etc.) disposed on the bottom surface of the coil portion (800) to be described later. Accordingly, the number of recessed grooves (930) may be equal to the number of sensors.

[0086] The coil section (800) may include a plurality of coils (820), a substrate (810) on which the plurality of coils (820) are arranged (which may be replaced with "circuit board (810)"), and a position sensor (830) arranged between the plurality of coils (820) on the substrate (810) (however, it is not limited thereto, and various sensors such as temperature sensors may be arranged). Additionally, the substrate (810) further includes a first terminal to which the position sensor is connected, a second terminal connected to an external power source, etc., and a circuit element (not shown in the drawing) connecting each of the second terminal and the first terminal to the plurality of coils (820).

[0087] Additionally, the coil portion (800) may further include a protective material. The coil portion (800) illustrated in FIG. 6 is a diagram showing a substrate (810) and a plurality of coils (820) covered by a protective material and disposed inside the protective material. The protective material may be PSR (Photo Solder Resist), but is not necessarily limited thereto. However, the first terminal and the second terminal may be exposed without being covered by the protective material for electrical connection with the position sensor and the external power source, respectively.

[0088] When the blade is composed of three layers, the number of coils in the coil section (800) that drives the blade and the number of S and N poles of the second magnet (710) that drives the blade are also determined as multiples of 3. When there are three coils, each blade layer is driven by one coil. When there are six coils, each blade layer is driven by two coils. The same applies to the second magnet (710). When there are three S and N poles of the second magnet (710), each blade layer is driven by one S and one N pole. When there are six S and N poles of the second magnet (710), each blade layer is driven by two S and two N poles. Therefore, the number of coils and magnets required to operate the blade is determined as a multiple of the number of blade layers. The number of N and S poles of the magnet mentioned above refers to the number when viewed from a top view, parallel to the optical axis.

[0089] As described above, the substrate (810) may include a first substrate (811) having a ring or disc shape and a second substrate (812) formed by extending from the second substrate (812).

[0090] At least some of a plurality of coils (820), a first terminal, a position sensor (830), and circuit elements may be disposed on the first substrate (811), and the remaining portion of a second terminal and circuit elements may be disposed on the second substrate (812).

[0091] The first substrate (811) may include a protrusion (811-1) that protrudes radially at the position where the coil is placed and has a shape corresponding to the shape of the coil when viewed in the z-axis direction. These protrusions (811-1) may be placed in the second space (920) of the aforementioned stator (900), and this structure may help to fix the coil portion (800) without rotating within the stator (900).

[0092] Additionally, each of the plurality of coils (820) may include at least one of an upper pattern coil disposed on the upper surface of the substrate (810) and a lower pattern coil disposed on the lower surface of the substrate (810), and when both the upper pattern coil and the lower pattern coil are included, the upper pattern coil and the lower pattern coil may be electrically connected through a via hole penetrating the substrate (810).

[0093] The upper pattern coil or the lower pattern coil includes a hollow and a spiral pattern shape extending outwardly and inwardly, and the spiral pattern may be a pattern formed by the pattern coil extending alternately in the circumferential and radial directions. A via hole may be formed on the hollow side, that is, on the innermost side of the pattern coil.

[0094] The magnitude of the thrust that rotates the moving part (500-2) can be adjusted by controlling the size, number, and number of turns of the coils.

[0095] Additionally, the coil portion (800) may include a position sensor that detects the rotational displacement of the ring magnet or rotor (200) by detecting the magnetic field of the ring magnet (700). For example, the position sensor may be placed or coupled on the lower or upper surface of the substrate (810).

[0096] For example, the position sensor may be a Hall sensor, a driver IC including a Hall sensor, an Anisotropic Magneto-Resistive (AMR) sensor, a Giant Magneto-Resistive (GMR) sensor, or a Tunnel Magneto-Resistive (TMR) sensor.

[0097] For example, if the position sensor is a Hall sensor or a TMR sensor, it is preferable to have two or more of them arranged to ensure high linearity with respect to the rotational displacement of the ring magnet (700), and in particular, in the case of the position sensor, it may be preferable for the two position sensors (830) to be arranged asymmetrically rather than symmetrically facing each other with respect to the optical axis.

[0098] In the aperture module (500), the moving part (500-2) may be an element or component that moves or rotates relative to the fixed part (500-3). In the aperture module (500), the moving part (500-2) may be replaced with a "rotating part."

[0099] For example, in the aperture module (500), the moving part (500-2) may include a rotor (200). Additionally, the moving part (500-2) may include at least one of a component coupled to the rotor (200), such as a support plate (510), a ring magnet (700) (a second magnet (700)), and a yoke (530). In the present invention, the blade part (300) is described as a separate component, but it may be considered to be included in the moving part (500-2). Such a configuration is merely an example and is not limited thereto, and other components may be additionally included.

[0100] The support plate (510) can serve to support the blade, and the yoke (530) can serve to allow the second magnet (700) to be attached to the rotor (200) and to direct the magnetism of the second magnet (700) toward the coil portion (800).

[0101] The rotor (200) includes a movable axis (521) protruding in the z-axis direction. The movable axis (521) is arranged point-symmetrically with respect to the optical axis, and the number of movable axes (521) may be equal to the number of multiple blades (311-319). Accordingly, the number of movable axes (521) may also be equal to the number of fixed axes (901). The movable axis (521) may be coupled, connected, inserted, or penetrated with the movable axis holes (612) of the multiple blades (311-319) to be described later, thereby causing each of the multiple blades (311-319) to rotate around the fixed axis (901).

[0102] The second magnet (700) included in the moving part (500-2) will be described later.

[0103] The blade section (300) may include a plurality of blades (311 to 319). Although FIG. 5a illustrates four blades (610) arranged on the upper and lower sides forming a single layer with a blade separator (620) in between, the embodiment is not limited thereto. That is, the blade separator (620) may or may not be included, and the number of the plurality of blades (311 to 319) may be eight or more, or eight or fewer. Additionally, it may be composed of one layer, or two or more layers.

[0104] Multiple blades (311 to 319) can form a variable opening (611) (hereinafter referred to as a "second opening") by being arranged alternately or stacked. In the case of blades separated into multiple layers as shown in FIG. 5a, a variable opening (611) can be formed for each layer.

[0105] Each of the plurality of blades (311–319) may include an inner surface that is at least partially bent or curved. For example, the inner surface of each of the plurality of blades (311–319) may include a curved or concave portion. For example, the curved or concave portion of each of the plurality of blades (311–319) may be arranged in a rounded shape toward the optical axis.

[0106] The shape of the inner surface of each of the multiple blades (311 to 319) can determine the shape of the variable opening (611). The shape of the variable opening (611) viewed from above may be circular, polygonal, or a polygonal shape composed of curved sides.

[0107] The shape of the variable opening (611) does not necessarily have to be circular, but it may be desirable to be circular to reduce light scattering, light splitting, and flare phenomena. The number of blades required to make the variable opening (611) circular may vary depending on the curved shape of the inner surface of the plurality of blades (311 to 319).

[0108] Each of the plurality of blades (311 to 319) may include a movable shaft hole (612) into which the movable shaft (521) of the movable part (500-2) is inserted or passes, and a fixed shaft hole (613) into which the fixed shaft (901) of the fixed part (500-3) is inserted or passes. The movable shaft hole (612) may be expressed as a "drive shaft hole," "rotational shaft hole," "coupling hole," "guide hole," or "first hole (or second hole)." The fixed shaft hole (613) may be expressed as a "rotational shaft hole," "coupling hole," or "second hole (or first hole)."

[0109] The movable shaft hole (612) may be a hole extended in one direction in which the movable shaft (521) moves while the fixed shaft (901) is inserted into the fixed shaft hole (613). That is, the movable shaft hole (612) may correspond to the path in which the movable shaft (521) moves. For example, the movable shaft hole (612) may be extended to guide the path in which the movable shaft (521) moves. For example, the movable shaft hole (612) may be extended or formed at an angle to the rotational direction of the moving part (500-2).

[0110] With the movable axis (521) and the fixed axis (901) respectively fitted into the movable axis hole (612) and the fixed axis hole (613), as the movable part (500-2) rotates around the optical axis, the plurality of blades (311~319) can move or rotate within a preset range (e.g., the range in which the movable axis hole (612) is extended) around the fixed axis (901).

[0111] The size (e.g., diameter) of the variable opening (611) formed by the plurality of blades can be varied by the movement or motion of the plurality of blades (311 to 319) and the bent or curved inner surface of each blade (610). By controlling the movement of the plurality of blades (311 to 319), variable openings (611) having different sizes can be realized.

[0112] The aperture module (500) may include a rolling member (911) disposed between the moving part (500-2) (e.g., rotor (200)) and the fixed part (500-3) (e.g., stator (900)) to facilitate rotation or movement of the moving part (500-2) (e.g., rotor (200)). For example, at least a portion of the rolling member (911) may be in contact with the rotor (200). Also, for example, at least another portion of the rolling member (911) may be in contact with the stator (900).

[0113] The rolling member (911) can reduce friction between the rotor (200) and the stator (900) by performing rolling or sliding motion between the rotor (200) and the stator (900), thereby facilitating the movement of the rotor (200) and reducing the driving current or power consumption required to move the rotor (200).

[0114] The rolling member (911) may be represented as a ball, a ball member, or a ball bearing. For example, the rolling member (911) may be made of metal, plastic, or resin, but is not limited thereto. The rolling member (911) may have a circular shape and may have a diameter of a size sufficient to support the movement of the rotor (200) (moving part (500-2)).

[0115] For example, the cloud member (911) may include a plurality of balls. In an embodiment of the present invention, the number of cloud members (911) is four, but in other embodiments, there may be two or three, or five or more. For example, the cloud member (911) may include a plurality of balls of different sizes.

[0116] At least one guide groove may be formed in the rotor (200) and the stator (900) to facilitate the placement or seating of the rolling member (911) and to guide its movement. The guide groove may be expressed as a "groove" or "path groove." For example, the number of guide grooves may be equal to the number of rolling members (911). For example, the guide groove of the rotor (200) and the guide groove of the stator (900) may face each other, and as the rotor (200) and the stator (900) are arranged vertically, a guide space capable of accommodating the rolling member (911) vertically may be provided.

[0117] The aperture module (500) (e.g., moving part (500-2)) may include a ring magnet (700) (second magnet (700)) that rotates around an optical axis.

[0118] The ring magnet (700) may face or overlap with a plurality of coils (820) of the coil section (800) in the direction of the optical axis, and may move through interaction with the plurality of coils (820) by electromagnetic force or rotate within a preset range centered on the optical axis (e.g., can be determined by the extension range of the movement axis hole (612)). The ring magnet (700) may rotate the rotor (200) together as it is fixedly coupled to the bottom surface of the rotor (200).

[0119] The ring magnet (700) may have an annular shape including a hollow. Additionally, the ring magnet (700) may include a flat portion (700A) having a flat shape on at least a portion of its outer surface. The rotor (200) may include a protrusion (200A) that includes a flat portion (200B) facing the flat portion (700A) of the ring magnet (700). The flat shape of the ring magnet (700) formed by the flat portion (700A) may correspond to the bottom shape of the rotor (200) formed by the protrusion (200A). The protrusion (200A) of the rotor (200) may serve to guide the ring magnet (700) to be assembled or coupled in the correct position when the ring magnet (700) is coupled to the rotor (200), and to prevent the ring magnet (700) from rotating within the rotor (200).

[0120] The number of planar sections (200A) may be one or more. The number of planar sections (200A) may be determined by the number of protrusions (200A) or planar sections (200B) of the rotor (200), and these may be subject to change depending on the design of the rotor (200). Additionally, in FIG. 4b, a plurality of planar sections (700A) are shown symmetrical to each other, with the center of the planar section (700A) overlapping with the contact surface of the N pole (702) and S pole (701) of the ring magnet, but this is merely an example and is not necessarily limited to this shape.

[0121] The ring magnet (700) may include a plurality of magnet units (710).

[0122] The magnet unit may be a single-pole magnet of a N pole or a S pole, a two-pole magnet of N poles and S poles arranged in a circumferential direction, a two-pole magnet of N poles and S poles arranged in a direction parallel to the optical axis, or a four-pole magnet in which N poles and S poles are alternately arranged in a circumferential direction and a direction parallel to the optical axis. For convenience of explanation in the following description and drawings, the magnet unit (710) will be described as a two-pole magnet including N poles (702) and S poles (701) arranged in a circumferential direction.

[0123] The number of magnet units (710) may be two, three, or more. Additionally, the magnet unit (710) may be a two-pole magnet including an N pole (702) and an S pole (701).

[0124] Multiple magnet units (710) may be arranged so that the N pole (702) and the S pole (701) alternate in the circumferential direction to form a ring shape. That is, the parts where two adjacent magnet units (710) come into contact with each other may have opposite polarities. The ring shape viewed from above may be a circular or polygonal shape including a hollow. In the embodiment, it is illustrated as a circle, but it is not necessarily limited thereto.

[0125] The ring magnet (700) can be arranged such that each pole is symmetrical with respect to the center of the ring magnet (700). As a result, the ring magnet (700) can have the following characteristics.

[0126] Regardless of whether the number of magnet units (710) constituting the ring magnet (700) is odd or even, the total number of poles constituting the ring magnet (700) may be an even number (number of magnet units (710) × 2 poles).

[0127] The angle formed by the center of each magnet unit (710) with respect to the center of the ring magnet (700) may be the same as the angle formed by the contact surface between the magnet units (710). Additionally, the angle formed by the center of each magnet unit (710) may be the same as the angle formed by the center of an adjacent S pole (701) or the angle formed by the center of an adjacent N pole (702).

[0128] Additionally, the angle between the centers of each pole (including both the N pole (702) and the S pole (701)) constituting the ring magnet (700) may be equal to each other ('equal' means equal within the margin of error). Additionally, the angle between the centers of each pole (701, 702) may be equal to the angle formed by the surfaces where each pole (701, 702) contacts. The angle between the surfaces where the N pole (702) and the S pole (701) contact each other may be equal to the angle between the centers of the N pole (702) and the S pole (701).

[0129] Additionally, the center of each of the magnet units (710) may be a concept corresponding to the center of the N pole (702) or S pole (701) included in the ring magnet (700), or the center of the contact surface between adjacent magnet units (710). The following describes the magnetic field interference phenomenon of the lens driving device (10) according to a comparative example with reference to FIGS. 7a to 7d. FIGS. 7a to 7d are plan views showing the lens driving device (10) including the aperture module (500) as viewed from direction A, and are drawings that do not show the configuration of the rest except for the substrate part (30), the first magnet (31), and the second magnet (700), which is a ring magnet. FIGS. 7a and 7c illustrate the case with 4 magnet units (710) (8 poles), and FIGS. 7b and 7d illustrate the case with 8 magnet units (710) (16 poles).

[0130] Referring to FIGS. 3 and 4, the first magnet (31) and the second magnet (700) do not overlap in a direction perpendicular to the optical axis (e.g., in the x-axis direction or the y-axis direction). However, the embodiment is not necessarily limited thereto, and at least a portion of the second magnet (700) may overlap with the first magnet (31) in a direction perpendicular to the optical axis.

[0131] As described above, the two poles of the first magnet (31) can be arranged in the z-axis direction. Since the second magnet (700) is located close to the upper side of the first magnet (31), the pole located on the upper side of the first magnet (31) can exert magnetic field interference on the second magnet (700), whether or not at least a portion of the first magnet (31) and the second magnet (700) overlap in the direction perpendicular to the optical axis.

[0132] In the following, a first magnet (31) having an N pole (702) on the upper side and an S pole (701) on the lower side will be described as an example. Accordingly, the shaded portion of the second magnet (700) shown in FIGS. 7a to 9 is considered to be the S pole (701). It is obvious that the following description applies equally even when the shaded portion is the N pole (702) and the unshaded portion is the S pole (701). The N pole (702) of the second magnet (700) can generate a repulsive force with the N pole of the first magnet (201), and the S pole (701) of the second magnet (700) can generate an attractive force with the N pole of the first magnet (201). Therefore, the second magnet (700) may show a tendency to rotate so that the S pole (701) faces the N pole of the first magnet (201).

[0133] Additionally, for convenience of explanation and understanding, the following description refers to a virtual line passing through the center of the optical axis and the first magnet (31) as P1 when viewed from a direction parallel to the optical axis, and a virtual line passing through the center passing through the optical axis and the S pole (701) of the second magnet (700) as P2. P1 is equal to the number of the first magnet (31), and P2 may be equal to the number of S poles (701) of the second magnet (700) (which is equal to the number of multiple magnet units (710)). The virtual line passing through the center of each of the optical axis and the multiple magnet units (710) may completely overlap with P2 as the second magnet (700) rotates about the optical axis.

[0134] Referring to FIGS. 7a and 7b, the upper pole (hereinafter, N pole (702)) of the first magnet (31) can generate a rotational force that causes the S pole (701) of the second magnet (700) to be positioned in the x-axis direction or the y-axis direction by creating an attractive force with the S pole (701) of the second magnet (700). Accordingly, in the case of FIG. 7a, the second magnet (700) receives a force that causes P2 to rotate by θ1, and in the case of FIG. 7b, the second magnet (700) receives a force that causes P2 to rotate by θ2. As a result, as shown in FIG. 7c and FIG. 7d, P1 and P2 completely overlap, and in this case, even if the second magnet (700) receives a Lorentz force from the coil, the second magnet (700) can be fixed without rotating due to the attractive force between the first magnet (31) and the second magnet (700).

[0135] As illustrated in FIGS. 7a and 7b, when the number of magnet units (710) constituting the second magnet (700) within the angle formed by adjacent P1s is a multiple of a natural number (this may correspond to the case where the product of the 'number of first magnets (31)' and the natural number is equal to the 'number of multiple magnet units (710) constituting the second magnet (700)'), at least a portion of P2 overlaps with all of P1. In this case, the magnetic field interference of the first magnet (31) becomes maximum, making it difficult to drive the aperture module (500).

[0136] Therefore, in order to reduce or prevent such magnetic field interference phenomena, the present invention proposes a structure in which part or all of P1 does not overlap with P2, that is, intersects with P2.

[0137] This is explained with reference to FIGS. 8a and 8b. FIGS. 8a and 8b are plan views of a lens driving device (10) according to an embodiment, and, like FIGS. 7a and 7b, are plan views taken from A, and the remaining components, excluding the substrate part (30), the first magnet (31), and the second magnet (700), are not shown. FIG. 8a shows the case where the number of multiple magnet units (710) is 5 (10 poles), and FIG. 8b shows the case where the number of multiple magnet units (710) is 6 (16 poles).

[0138] When the number of first magnets (31) is 4, or when the number of multiple magnet units (710) is not a multiple of 4, for example, 5 or 6, only some of P1 may overlap with some of P2 as illustrated. In the case of FIG. 8a, only 1 P1 may overlap with some of P2, and in the case of FIG. 8b, only 2 P1s may overlap with some of P2. In FIG. 8a and FIG. 8b, P2 that does not overlap with P1 is illustrated as P2'.

[0139] In this case, unlike in FIGS. 7a and 7b, since not all P1 overlaps with P2, the magnetic field interference of the first magnet (31) can be reduced, and even if some P1 and P2 overlap, this may not affect the driving of the aperture module (500) by the coil.

[0140] In order to ensure that all P1s do not overlap with P2s, the angle formed by adjacent P1s and the angle formed by two P2s must not be the same angle, and the natural number product of the angle formed by adjacent P2s must not match the angle between adjacent P1s. The number of P1s is equal to the number of first magnets (31), and the angle formed by adjacent P1s is the number obtained by dividing 360 degrees by the number of first magnets (31s). This applies equally to the second magnet (700). The condition that all P1s do not overlap with P2s may be that the number of magnet units (710) constituting the second magnet (700) within the angle formed by adjacent P1s does not form a multiple of a natural number, or that the natural number product of the number of first magnets (31s) is not equal to the number of multiple magnet units (710) constituting the second magnet (700).

[0141] According to this, for example, if the number of P1 (number of first magnets (31)) is 4, the number of second virtual lines (number of S poles (701) of the second magnet (700) or number of magnet units (710)) may be 3, 5, 6, 7, 9, or 11.

[0142] The following describes the design of the coil, fixed shaft (901), and rolling member according to the number of magnet units (710) with reference to FIGS. 9a to 9c. FIGS. 9a to 9c are plan views of the aperture module (500) viewed from direction A, and the configuration of the remaining parts, excluding the second magnet (700), a plurality of coils (820), a position sensor (830), a fixed shaft (901), and a rolling member (911), is not shown.

[0143] The hatched circles in FIGS. 9a to 9c represent the fixing pins, the white circles represent the cloud members, and the checkered squares represent the position sensors (830).

[0144] The number of multiple coils (820) can be determined according to the number of magnet units (710). The number of multiple coils (820) may be any one of two to the number of poles constituting the second magnet (700).

[0145] In order for each of the plurality of coils (820) to generate rotational force in the same direction, as shown in FIGS. 9a and 9c, the area occupied by the N pole (702) and the S pole (701) of the second magnet (700) within the area overlapping each of the plurality of coils (820) in a direction parallel to the optical axis must be the same. In this case, current can flow in the plurality of coils (820) in the same rotational direction.

[0146] Alternatively, as shown in FIG. 9b, two types of coils may be included having an overlapping area where the area occupied by the N pole (702) and the area occupied by the S pole (701) are opposite to each other. In this case, current may flow in opposite rotational directions in the two types of coils. For example, if current flows clockwise in the three coils at the same location as in FIG. 9a in FIG. 9c, the area occupied by the S pole (701) and N pole (702) of the second magnet (700) that overlaps with the remaining three coils is opposite to the area occupied by the S pole (701) and N pole (702) of the second magnet (700) that overlaps with the three coils at the same location as in FIG. 9a, and in this case, current may flow counterclockwise.

[0147] In order for the coils to be arranged in this manner, each of the plurality of coils (820) may be arranged point-symmetrically with respect to the optical axis, or plane-symmetrically with respect to a plane containing the optical axis (or line-symmetrically with respect to an imaginary line perpendicular to the optical axis). In addition, in this case, the position or number of poles of the second magnet (700) must also be taken into account.

[0148] The number of coils satisfying this can be a factor of the number of poles constituting the second magnet (700) (defined as a set of divisors excluding 1 and itself). When the number of poles constituting the second magnet (700) is 12 poles, the factors of 12 are 2, 3, 4, and 6, so the plurality of coils (820) can be 2, 3, 4, or 6.

[0149] A plurality of coils (820) can be arranged such that three coils are point-symmetric with respect to the optical axis at θ3 (120 degrees) as in FIG. 9a, four coils are arranged such that they are point-symmetric with respect to the optical axis at θ4 (90 degrees) as in FIG. 9b, or are arranged such that they are line-symmetric with respect to the S1 plane, and are arranged such that they are line-symmetric with respect to the S2 plane as in FIG. 9c.

[0150] Below, we examine the relationship between the multiple coils (820), the fixed shaft (901), and the rolling member.

[0151] As illustrated in FIG. 5c, the guide groove in which the rolling member (911) is placed is in the first space (910) among the multiple spaces formed by adjacent fixed axes (901), and the coil is placed in the second space (920) among the multiple spaces. Accordingly, the multiple coils (820), fixed axes (901), and rolling members may not overlap each other in the z-axis direction.

[0152] Additionally, as described above, a plurality of coils (820) are arranged such that a number corresponding to the factor of the number of poles constituting the second magnet (700) is point-symmetric with respect to the optical axis or line-symmetric with respect to a plane including the optical axis, and the fixed axis (901) and the rolling member (911) are also arranged point-symmetric with respect to the optical axis.

[0153] Ultimately, a cloud member (911) must be placed in a space that is point-symmetric with respect to the optical axis among the interspaces (equal to the number of fixed axes (901)) formed by multiple fixed axes (901), and multiple coils (820) may be placed point-symmetric or line-symmetric in at least a part of the other space.

[0154] The number of fixed shafts (901) satisfying this can be the number of rolling members (911) multiplied by a natural number greater than or equal to 2, and the number of multiple coils (820) can be the same value as the value obtained by limiting the number of rolling members (911) from the number of fixed shafts (901) among the factors of the number of poles of the second magnet (700).

[0155] However, the above conditions may be applied when only the number of magnet units (710) constituting the second magnet (700) is changed while maintaining the same design conditions for other configurations. Therefore, if the design is such that the diameter of the stator (900) is increased so that multiple coils (820) are not placed in the space between the fixed shafts (901) (second space (920)), the above conditions must not necessarily be satisfied.

[0156] It may be preferable that there be at least three or more rolling members (911) so that the moving part (500-2) can rotate smoothly within the fixed part (500-3).

[0157] For example, if the number of poles of the second magnet (700) is 12 (factors are 2, 3, 4, 6) and the number of rolling members (911) is 3, the number of fixed shafts (901) (number of rolling members (911) * 2 or greater natural number) may be 6, 9, or 12, and since the value obtained by subtracting the number of rolling members (911) from the number of fixed shafts (901) is 3, 6, or 9, the number of multiple coils (820) may be 3 or 6 (see FIG. 9a and FIG. 9c).

[0158] For example, if the number of poles of the second magnet (700) is 12 (factors are 2, 3, 4, 6) and the number of rolling members (911) is 4, the number of fixed shafts (901) (number of rolling members (911) × 2 or greater natural number) can be 8 or 12, and since the value obtained by subtracting the number of rolling members (911) from the number of fixed shafts (901) is 4 or 8, the number of multiple coils (820) can be 4 (see FIG. 8b).

[0159] Accordingly, when the number of poles of the second magnet (700) is 12, the fixed shaft (901) may be 8 or 9, and the rolling member (911) may be 3 or 4. This means that as long as the above conditions are satisfied, the aperture module (500) (e.g., the number or position of multiple coils (820), fixed shafts (901), and rolling member (911), etc.) can be designed in a more diverse way.

[0160] Thus, the embodiment of the present invention adjusts the number of poles of the second magnet (700) to appropriately adjust the positions of the poles of the first magnet (31) and the second magnet (700) to cancel out magnetic field interference, thereby enabling the aperture module (500) to operate smoothly.

[0161] In addition, the embodiment allows for a more free design of the aperture module (500) by increasing the number of poles of the second magnet (700) to ensure diversity in the number or position of multiple coils (820), fixed shafts (901), and rolling members (911) inside the aperture module (500).

[0162] The aperture module (500) and lens driving device (10) according to the embodiment of the present invention are not limited to the configuration described above. That is, the aperture module (500) and lens driving device (10) according to the embodiment may also be applied to an aperture module (500) having a configuration different from the configuration described above.

[0163] FIG. 10 is a perspective view showing the configuration of an aperture module according to the present invention, and FIG. 11 is an exploded perspective view showing the configuration of an aperture module according to the present invention.

[0164] The aperture module according to the present invention comprises a support member (100), a rotor (200), and a blade member (300) that are stacked in sequence.

[0165] The support member (100) includes a first opening (101) that overlaps with a lens (not shown) and supports the rotor (200) and the blade member (300).

[0166] The rotor (200) is rotatably disposed on the support member (100) around the optical axis (OA) and includes a lens and a second opening (201) that overlaps with the first opening (101), and supports the blade member (300).

[0167] The blade portion (300) is formed in three layers in a direction perpendicular to the optical axis (OA) and is equipped with nine blades that are each rotatably arranged in conjunction with the rotation of the rotor (200) to form light incident apertures of various sizes.

[0168] FIG. 11 is a perspective view showing that the blade portion of the aperture module according to the present invention is composed of three layers, and FIG. 12a and FIG. 12b are exemplary diagrams showing the shape according to the operation of the blade portion in the aperture module according to one embodiment of the present invention. FIG. 13a and FIG. 13b are exemplary diagrams showing the shape according to the operation of the blade portion in the aperture module according to another embodiment of the present invention. The shape of the blade shown in FIG. 12a and FIG. 12b in the first embodiment differs from the shape of the blade in FIG. 13a and FIG. 13b only in the position of the rotation axis holes (311a ~ 319a) and the drive axis holes (311b ~ 319b). A plurality of drive axes (211~219) formed in the rotor (200) rotate each blade (311~319) by moving along the drive axis holes (311b ~ 319b) according to the counterclockwise rotation of the rotor (200). In other words, although the positions of the rotation shaft hole and the drive shaft hole are arranged differently in the two embodiments, the operating principle is the same.

[0169] FIG. 12a shows the blade portion (300) forming the maximum light incident aperture, and FIG. 12b shows the blade portion (300) forming the minimum light incident aperture.

[0170] Each blade (311-319) is formed such that the inner surface of the blade body adjacent to the optical axis has a curved portion, and the outer surface of the blade body has at least one inflection portion.

[0171] The plurality of blades (311~319) are formed to include a shielding area that shields a light incident opening by rotating around a rotation axis (111~119) protruding from the support member (100) inserted into the rotation axis hole (311a~319a), and a driving section in which the drive axes (211~219) of a rotor (200) inserted into the drive axis hole (311b~319b) and rotating move along the slit of the drive axis hole (311b~319b).

[0172] When viewed from the direction of the optical axis, the first blade (311) to the ninth blade (319) are displayed in a clockwise order. As shown in FIG. 12a, for the three blades (311, 314, 317) placed on the same layer, for example, the top layer (300-3L), in a direction perpendicular to the optical axis, the angle (θ1) formed by the plurality of virtual lines (VL1-1, VL1-2, VL1-3) connecting each rotation axis hole (311a, 314a, 317a) and the optical axis can be 120°.

[0173] As illustrated in FIG. 12b, for two blades (311 and 319) of different layers (300-3L and 300-1L) placed adjacent to each other in the direction of the optical axis, the angle (θ2) formed by the virtual line (VL1-1) connecting the rotational axis hole (311a) of the upper layer (300-3L) blade (311) and the optical axis connecting the rotational axis hole (319a) of the lower layer (300-1L) blade (319) can be 35° to 45°. When the blades of each layer (300-1L to 300-3L) are placed at equal intervals, multiple virtual lines can be 40° apart.

[0174] The angle between the blade (313) of the lowest layer (300-1L) and the blade (312) of the middle layer (300-2L) may be 35°, and the angle between the blade (312) of the middle layer (300-2L) and the blade (311) of the top layer (300-1L) may be 40°. That is, the lowest layer (300-1L) and the middle layer (300-2L), and the middle layer (300-2L) and the top layer (300-3L) may be arranged slightly offset from each other. When an actuator, etc. is designed to be inserted between the drive shafts (211~219) inserted into the rotation shaft holes (311a~319a) and drive shaft holes (311b~319b) of each blade (311~319), the drive shaft between each blade may be formed by shifting it by about 5°. Therefore, the design freedom of the actuator structure is improved. However, if the gap exceeds 5°, the overlapping area between the upper and lower blades is eliminated, and the blades may get caught on each other, causing a defect in aperture operation.

[0175] At this time, each of the three blades arranged in the same layer in a direction perpendicular to the optical axis does not overlap in the direction of the optical axis throughout the entire rotational movement section. That is, as shown in FIG. 12a, the third blade (313), the sixth blade (316), and the ninth blade (319) of the first layer (300-1L), which is the lowest layer forming the maximum light incident aperture, do not overlap each other when rotated counterclockwise to have the minimum size light incident aperture as shown in FIG. 12b by the aperture operation. This is also the case for the operation of the second blade (312), the fifth blade (315), and the eighth blade (318) of the middle layer (300-2L), and for the rotational operation of the first blade (311), the fourth blade (314), and the seventh blade (317) of the top layer (300-3L).

[0176] Meanwhile, any one blade placed in the upper layer may be supported by always overlapping with two blades in the lower layer. For example, the first blade (311) of the top layer (300-3L) is supported by the two blades (312, 318) by always overlapping in a vertical direction with the second blade (312) and the eighth blade (318) of the middle layer (300-2L). The fourth blade (314) of the top layer (300-3L) is supported by the two blades (312, 315) by always overlapping in a vertical direction with the second blade (312) and the fifth blade (315) of the middle layer (300-2L). The 7th blade (317) of the top layer (300-3L) is partially overlapped vertically with the 5th blade (315) and the 8th blade (315) of the middle layer (300-2L) and is supported by two blades (315, 318). Likewise, the 2nd blade (312) of the middle layer (300-2L) is partially overlapped vertically with the 3rd blade (313) and the 9th blade (319) of the bottom layer (300-1L) and is supported by two blades (313, 319). The 5th blade (315) of the middle layer (300-2L) is always partially overlapped vertically with the 3rd blade (313) and the 6th blade (316) of the bottom layer (300-1L) and is supported by two blades (313, 316). The 8th blade (318) of the middle layer (300-2L) is partially overlapped in the vertical direction with the 6th blade (316) and the 9th blade (319) of the lowest layer (300-1L) and is supported by the two blades (316, 319).

[0177] Interlayer support is provided only if there is an overlapping area in all situations, regardless of the size of the optical incident aperture. Interference between drives means that a blade that should be on another layer moves up or sags down, causing it to get caught on a blade on another layer. Blades within the same layer do not overlap.

[0178] As shown in FIG. 12a and FIG. 13a, when the size of the light incident aperture formed by the nine blades (311-319) is the largest, the distance (d1) between the rotation axis holes (311a-319a) and the drive axis holes (311b-319b) of each blade (311-319) is the shortest.

[0179] As shown in FIG. 12b and FIG. 13b, when the size of the light incident aperture formed by the nine blades (311-319) is the smallest, the distance (d2) between the rotation axis holes (311a-319a) and the drive axis holes (311b-319b) of each blade (311-319) is the longest.

[0180] When the amount of light incident on the lens is at its maximum, the amount of light incident on the lens is determined by the inner surface adjacent to each rotation axis hole (311a~319a) of each blade (311), and as the amount of light incident on the lens decreases from its maximum, the amount of light incident on the lens can be determined by the inner surface of each blade body adjacent to the optical axis.

[0181] FIG. 14 is an exemplary diagram showing the shape of a light incident aperture formed by an aperture module according to the present invention. As shown, the light incident aperture (400) formed by nine blades (311 to 319) has a nonagonal shape due to the inner surfaces of the nine blades. While the light incident aperture formed by an aperture having an even number of blades, namely four, six, and eight blades, is point-symmetric with respect to its center point, the shape of the light incident aperture (400) formed by the aperture module according to the present invention is asymmetric with respect to its center point (410). This can have the effect of making the diffraction phenomenon appear less prominent.

[0182] FIG. 15 is an example diagram showing the change in the shape of the light incident aperture when the blades constituting the aperture module are changed. (A) shows a light incident aperture by an aperture composed of 6 blades forming 2 layers, (B) shows a light incident aperture by an aperture composed of 8 blades forming 5 layers, and (C) shows a light incident aperture by an aperture operation composed of 9 blades divided and arranged in 3 layers as in the present invention.

[0183] Designing the blades to be long is advantageous for realizing a circular shape, but the blades must not overlap on the same layer. Therefore, when configuring eight blades by dividing them across two layers, if four blades are placed on one layer, the blades become short and it is difficult to realize a circular shape. Therefore, an aperture module with eight blades is configured by placing two blades on each of the four layers. In this case, when implementing with two blades on each of the four layers, interference occurs between the second and third layers, so an intermediate support layer must be placed between them.

[0184] On the other hand, the aperture according to the present invention has nine blades arranged in three layers, thereby enabling the realization of a desired target focus (F#) and allowing for changes in the depth of field of the subject according to the F-value. Under the same design criteria, an aperture composed of nine blades can exhibit a light incident aperture that is much closer to a circle.

[0185] As described above, the aperture module according to the present invention can form a light incident aperture that is close to a circle compared to an aperture module composed of 6 or 8 blades by arranging 9 blades in groups of 3 in 3 layers so as not to overlap each other. In addition, the blades are asymmetrical with respect to the center of the light incident aperture, which can produce the effect of making diffraction phenomena less prominent.

[0186] Although the present invention has been described above with reference to preferred embodiments, those skilled in the art will understand that various modifications and changes can be made to the invention without departing from the spirit and scope of the invention as described in the following claims.

[0187] An embodiment of the present invention can be used in an aperture module capable of minimizing diffraction phenomena and in a camera module including the same.

Claims

1. Includes an aperture module, The above aperture module is, A coil section including a plurality of coils; A fixed part on which the above coil part is placed; A ring magnet facing the coil portion and interacting with the coil portion to rotate about a first axis; A moving part on which the above ring magnet is placed; and It includes a blade part that forms a variable opening by combining with the above-mentioned fixed part and moving part, and The above ring magnet includes a plurality of N poles and a plurality of S poles arranged alternately with each other, and The blade portion includes a plurality of blade layers stacked in a direction parallel to the first axis, and Each of the above plurality of blade layers includes a plurality of blades, and The number of the plurality of coils is greater than the number of the plurality of blade layers, and The sum of the plurality of N poles and the plurality of S poles is greater than the number of the plurality of coils, and A camera module in which the number of coils, the number of N poles, and the number of blade layers are multiples of 3.

2. In claim 1, it further includes a plurality of first magnet units spaced apart from each other on the outer side of the aperture when viewed from a top view, The number of the above plurality of S poles is, Not equal to the natural number product of the number of the first magnet units mentioned above, Camera module.

3. In claim 1, the number of the plurality of coils is, One of the factors of the sum of the plurality of N poles and the plurality of S poles (wherein the factor is the set of divisors excluding 1 and itself), Camera module.

4. In claim 1, the fixing part includes a plurality of fixing axes spaced apart at the same angle with respect to the first axis, and The above moving part includes a plurality of moving axes spaced apart at the same angle with respect to the first axis, and Each of the plurality of blades includes a fixed shaft hole coupled to the fixed shaft and a movable shaft hole coupled to the movable shaft. Camera module.

5. In claim 4, the blade portion comprises three blade layers, and The blade layer comprises three blades arranged point-symmetrically with respect to the first axis. Camera module.

6. In claim 4, further comprising a rolling member disposed between the fixed part and the movable part, The plurality of coil units are disposed in a first space among a plurality of spaces formed between the plurality of fixed axes, and The above cloud member is disposed in a second space other than the first space among the plurality of spaces, Camera module.

7. In claim 4, further comprising a rolling member disposed between the fixed part and the movable part, and The above rolling member, the plurality of coils, and the plurality of fixed axes do not overlap in a direction parallel to the first axis, Camera module.

8. In claim 4, the blade portion A variable opening that becomes larger as the distance between the moving axis and the fixed axis coupled to the blade decreases, Camera module.

9. In claim 3, further comprising a rolling member disposed between the fixed part and the movable part, and The sum of the number of the plurality of coils and the number of the rolling members is included in the factor of the sum of the plurality of N poles and the plurality of S poles, Camera mode.

10. In claim 3, the moving part includes a protrusion disposed on the outer side of the ring magnet, and the inner surface of the protrusion has a flat surface, The above ring magnet is A planar portion formed on an outer surface, wherein the planar portion faces the inner surface of the protrusion. Camera module.

11. In claim 3, the plurality of coils are symmetrically arranged with respect to a virtual plane including the first axis, Camera module.

12. In claim 11, the coil portion A substrate on which the above plurality of coils are arranged; It includes a plurality of position sensors disposed on the above substrate, and The plurality of position sensors are arranged asymmetrically with respect to the first axis. Camera module.

13. In claim 12, further comprising a ring-shaped yoke disposed between the second magnet and the moving part, Camera module.

14. In claim 1, the total number of the plurality of N poles and the plurality of S poles is 12, and the number of the plurality of coils is 6. Camera module.

15. Includes an aperture module, The above aperture module is, A coil section comprising a plurality of coils, a substrate on which the plurality of coils are disposed, and a plurality of position sensors disposed on the substrate; A fixed part on which the above coil part is placed; A ring-shaped ring magnet facing the coil portion and interacting with the coil portion to rotate about a first axis; A movable part on which the above ring magnet is placed; A blade portion formed by combining the fixed portion and the movable portion to form a variable opening; and It includes a ring-shaped yoke positioned between the above-mentioned ring magnet and the moving part, and The plurality of position sensors are arranged asymmetrically with respect to the first axis, and The above ring magnet includes a plurality of N poles and a plurality of S poles arranged alternately with each other, and The blade portion comprises a plurality of blade layers stacked in the direction of the first axis, and each of the plurality of blade layers comprises a plurality of blades. The number of the above plurality of coils is, It is greater than the number of the plurality of blade layers and is one of the factors of the sum of the plurality of N poles and the plurality of S poles (wherein the factor is the set of divisors excluding 1 and itself), The sum of the plurality of coils, the plurality of N poles, and the plurality of S poles is a multiple of the plurality of coils, Camera device.

Images