Lens driving device, camera module, and method for manufacturing lens driving device

Abstract

Provided is a lens driving device capable of more reliably suppressing a foreign object from reaching a photographing element. A lens drive device (101) is provided with: a lens holding member (2) capable of holding a lens body (LS); a base member (8) having an opening (8K) provided corresponding to the lens body (LS) and penetrating in the vertical direction; a drive unit (DM) that moves the lens holding member (2) relative to the base member (8); and a housing member (1) as a support member for supporting the base member (8). The housing member (1) has a base portion (1B) disposed on the lower side of the base member (8), and a cylindrical portion (1C) protruding upward from the inner edge portion of the base portion (1B) and disposed on the inner side of the opening (8K). An adhesive foreign matter capturing member (FM) is disposed on the tip portion (1CT) of the cylindrical portion (1C).

Description

Technical Field

[0001] The present disclosure relates to a lens driving device mounted on, for example, a portable device with a camera. Background Art

[0002] In the past, there is known a lens driving device, which includes: a lens holder (lens holding component) capable of holding a lens barrel (lens body); a base (base component) having an opening provided corresponding to the lens body and extending in the vertical direction; and a driving unit for moving the lens holding component relative to the base component (see Patent Document 1). In the lens driving device, a dust capture agent (foreign matter capturing material) is provided on the base component.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2009-251517 Summary of the invention

[0006] Problems that the invention will solve

[0007] However, in the above-mentioned device, since the foreign matter capturing material is provided at a position away from the opening, there is a risk that foreign matter may enter the opening and reach the imaging element.

[0008] Therefore, it is desirable to provide a lens driving device that can more reliably suppress foreign matter from reaching an image pickup element.

[0009] Means for solving problems

[0010] A lens driving device in one embodiment of the present disclosure comprises: a lens holding component capable of holding a lens body; a base component having an opening that is arranged corresponding to the lens body and passes through in the up-down direction; and a driving unit that moves the lens holding component relative to the base component, the lens driving device having a supporting component that supports the base component, the supporting component having a base arranged on the lower side of the base component and a cylindrical portion that protrudes upward from the inner edge of the base and is arranged on the inner side of the opening, and an adhesive foreign matter capturing component is arranged at the front end of the cylindrical portion.

[0011] Effects of the Invention

[0012] The lens driving device described above can more reliably prevent foreign matter from reaching the image pickup element. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a perspective view of a camera module including a lens driving device.

[0014] Figure 2It is an exploded perspective view of the lens driving device.

[0015] Figure 3 This is a perspective view of the coil, lower leaf spring, and conductive member that constitute the lens drive device.

[0016] Figure 4 These are a top view and a bottom view of a housing member constituting the lens driving device.

[0017] Figure 5 It is a cross-sectional view of a lens driving device.

[0018] Figure 6 This is a diagram showing a procedure for installing a foreign matter capturing member on a housing member.

[0019] Figure 7 This is a diagram showing another procedure for providing a foreign matter capturing member on a housing member. DETAILED DESCRIPTION

[0020] Hereinafter, the lens driving device 101 according to the embodiment of the present disclosure will be described with reference to the drawings. Figure 1 It is an exploded perspective view of a camera module CD including the lens driving device 101 . Figure 2 It is an exploded perspective view of the lens driving device 101 .

[0021] exist Figure 1 as well as Figure 2 In , X1 represents one direction of the X axis constituting the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X axis. In addition, Y1 represents one direction of the Y axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z axis. Figure 1 as well as Figure 2 In the figure, the X1 side of the lens driving device 101 corresponds to the front side (front side) of the lens driving device 101, and the X2 side of the lens driving device 101 corresponds to the rear side (back side) of the lens driving device 101. In addition, the Y1 side of the lens driving device 101 corresponds to the right side of the lens driving device 101, and the Y2 side of the lens driving device 101 corresponds to the left side of the lens driving device 101. In addition, the Z1 side of the lens driving device 101 corresponds to the upper side (subject side) of the lens driving device 101, and the Z2 side of the lens driving device 101 corresponds to the lower side (photographing element side) of the lens driving device 101. The same is true in other figures.

[0022] like Figure 1 As shown in FIG. 1 , the camera module CD includes a substrate SB, a lens driving device 101, a lens body LS mounted on the lens driving device 101, and an image pickup element IS mounted on the substrate SB so as to face the lens body LS. Figure 1 The lens body LS schematically shown in the figure is, for example, a cylindrical lens barrel having at least one lens. In addition, the camera module CD may be connected to a control device CTR composed of a microcomputer including a CPU and a memory. In the example shown in the figure, the control device CTR is arranged outside the camera module CD, but it may also be arranged inside the camera module CD. The lens driving device 101 having a substantially cubic shape is shown in FIG. Figure 1 As shown, it is mounted on a substrate SB on which an imaging element IS is mounted.

[0023] Specifically, the lens driving device 101 is as follows Figure 1 as well as Figure 2 As shown, the housing member 1 and the cover member 4 are included as a part of the fixed side member FB. The housing member 1 and the cover member 4 are configured to function as a part of the frame HS covering other members. In the present embodiment, the housing member 1 and the cover member 4 are formed of non-magnetic metal. However, the housing member 1 and the cover member 4 may be formed of magnetic metal or synthetic resin.

[0024] Specifically, the housing component 1 is as follows Figure 2 As shown, it has a rectangular cylindrical outer wall portion 1A and a rectangular ring-shaped and flat base 1B continuously arranged with the lower end (end on the Z2 side) of the outer wall portion 1A. A roughly circular opening 1K is formed in the center of the base 1B. The outer wall portion 1A includes a first side plate portion 1A1 to a fourth side plate portion 1A4. The first side plate portion 1A1 and the third side plate portion 1A3 are opposite to each other, and the second side plate portion 1A2 and the fourth side plate portion 1A4 are opposite to each other. Moreover, the first side plate portion 1A1 and the third side plate portion 1A3 extend vertically relative to the second side plate portion 1A2 and the fourth side plate portion 4A4. In addition, the base 1B is not limited to a flat plate shape, and may also have a recessed portion or a convex portion.

[0025] Cover member 4 Figure 2 As shown, it has a rectangular cylindrical outer wall portion 4A and a rectangular ring-shaped top plate portion 4B continuously arranged with the upper end (end on the Z1 side) of the outer wall portion 4A. A roughly circular opening 4K is formed in the center of the top plate portion 4B. The outer wall portion 4A includes a first side plate portion 4A1 to a fourth side plate portion 4A4. The first side plate portion 4A1 and the third side plate portion 4A3 are opposite to each other, and the second side plate portion 4A2 and the fourth side plate portion 4A4 are opposite to each other. Moreover, the first side plate portion 4A1 and the third side plate portion 4A3 extend perpendicularly relative to the second side plate portion 4A2 and the fourth side plate portion 4A4. In addition, the top plate portion 4B has recessed portions formed at the four corners respectively, but it can also be configured as a flat plate, or it can be configured to have a convex portion.

[0026] like Figure 1As shown, the cover member 4 is bonded to the case member 1 by an adhesive. Also, the outer peripheral wall portion 1A of the case member 1 is arranged to partially cover the outer peripheral wall portion 4A of the cover member 4. However, the cover member 4 may be bonded to the case member 1 by a conductive adhesive, solder, welding, or the like.

[0027] like Figure 2 As shown, the frame HS contains a lens holding member 2, a coil 3, a magnet 5, an upper leaf spring 6, a lower leaf spring 7, a base member 8, etc. The lens holding member 2 is capable of holding the lens body LS (see Figure 1 ) constitutes the movable side member MB. The lens body LS is arranged so that the optical axis OA is along the central axis of the lens driving device 101.

[0028] The lens holding member 2 is formed by injection molding a synthetic resin such as a liquid crystal polymer (LCP). Figure 2 As shown, it includes a cylindrical portion 2C formed to extend along the optical axis OA, an upper pedestal portion 2D on which the upper leaf spring 6 is mounted, an outer peripheral portion 2E on which the coil 3 is wound, and a lower pedestal portion 2F on which the lower leaf spring 7 is mounted.

[0029] A spiral groove is formed on the inner circumference of the cylindrical portion 2C. This is to increase the bonding strength of the adhesive applied between the lens body LS and the inner circumference of the cylindrical portion 2C. In addition, the lens body LS can also be configured to be screwed onto the inner circumference of the cylindrical portion 2C.

[0030] The coil 3 is a member constituting the drive unit DM. The drive unit DM is a mechanism for moving the lens holding member 2 relative to the fixed-side member FB. In the example shown in the figure, the coil 3 is wound around the outer peripheral surface of the outer peripheral portion 2E of the lens holding member 2 .

[0031] The magnet 5 is a member constituting the driving unit DM. In the example shown in the figure, the magnet 5 is a bipolar magnet and includes a first magnet 5A to a fourth magnet 5D. The magnet 5 is fixed to the inner peripheral surface of the outer peripheral wall portion 4A of the cover member 4 by an adhesive.

[0032] The base member 8 is formed by injection molding using a synthetic resin such as a liquid crystal polymer (LCP). In the present embodiment, the base member 8 has a generally rectangular shape when viewed from above, and has a circular opening 8K in the center. Specifically, the base member 8 has a rectangular ring-shaped base 8B configured to surround the circular opening 8K. Moreover, the base 8B has four sides 8E (a first side 8E1 to a fourth side 8E4). In addition, fixed side seating portions 8D for mounting the lower leaf spring 7 are formed at the four corners of the base member 8. The fixed side seating portion 8D is formed to protrude upward from the base 8B of the base member 8. In addition, a conductive component CM is embedded in the base 8B of the base member 8.

[0033] The base member 8 is integrated with the housing member 1 (see Figure 5 Specifically, the base member 8 is disposed on the upper surface of the base portion 1B of the case member 1 and is fixed to the case member 1 by an adhesive. That is, the case member 1 constitutes a support member that supports the base member 8.

[0034] The upper leaf spring 6 is configured to support the movable side member MB (lens holding member 2) so that it can move relative to the fixed side member FB (cover member 4) in a direction parallel to the optical axis OA. The lower leaf spring 7 is configured to support the movable side member MB (lens holding member 2) so that it can move relative to the fixed side member FB (base member 8) in a direction parallel to the optical axis OA.

[0035] The upper leaf spring 6 is configured to connect the upper seat portion 2D formed on the lens holding member 2 and the four corners of the cover member 4. The lower leaf spring 7 is configured to connect the lower seat portion 2F formed on the lens holding member 2 and the fixed side seat portion 8D formed on the base member 8.

[0036] In the present embodiment, the upper leaf spring 6 and the lower leaf spring 7 are made of metal plates mainly made of, for example, copper alloy, titanium-copper alloy (titanium-copper), or copper-nickel alloy (nickel-tin-copper).

[0037] The upper leaf spring 6 has an outer portion 6E fixed to the fixed side member FB (cover member 4), two inner portions 6N fixed to the movable side member MB (lens holding member 2), and four elastic arm portions 6G that are elastically deformable and connect the outer portion 6E to each of the two inner portions 6N. The outer portion 6E is fixed to the cover member 4 and the magnet 5 by an adhesive in a state of being sandwiched between the upper surface of the magnet 5 and the ceiling surface (lower surface of the recessed portion) of the cover member 4. The inner portion 6N is fixed to the upper seat portion 2D of the lens holding member 2 by an adhesive.

[0038] The lower leaf spring 7 includes a first lower leaf spring 7A and a second lower leaf spring 7B. The first lower leaf spring 7A and the second lower leaf spring 7B each have an outer portion 7E fixed to the fixed side member FB (base member 8), an inner portion 7N fixed to the movable side member MB (lens holding member 2), and two elastic arm portions 7G that are elastically deformable and connect the outer portion 7E and the inner portion 7N.

[0039] Here, refer to Figure 3 , the path of the current flowing through the coil 3, that is, the connection relationship between the coil 3, the lower leaf spring 7 and the conductive member CM will be described. Figure 3 3 is a perspective view of the coil 3, the lower leaf spring 7 and the conductive member CM. Specifically, Figure 3The upper figure (the figure located on the upper side of the block arrow) is an exploded perspective view of the coil 3, the lower leaf spring 7 and the conductive member CM. Figure 3 The lower figure (the figure located on the lower side of the block arrow) is an assembly stereoscopic diagram of the coil 3, the lower leaf spring 7 and the conductive component CM, showing the positional relationship between the coil 3, the lower leaf spring 7 and the conductive component CM in the lens driving device 101.

[0040] The coil 3 has one end, i.e., the first end 3A, fixed to the inner portion 7N of the first lower leaf spring 7A by means of a conductive adhesive, solder, or welding (hereinafter referred to as "welding, etc."), and the other end, i.e., the second end 3B, fixed to the inner portion 7N of the second lower leaf spring 7B by means of welding, etc.

[0041] The conductive member CM partially embedded in the base member 8 is as follows: Figure 3 As shown, it includes a first conductive component CM1, a second conductive component CM2 and a third conductive component CM3.

[0042] Specifically, the conductive component CM has a terminal portion TM (first terminal portion TM1 to third terminal portion TM3) protruding downward from the lower surface of the base component 8, an exposed portion CP (first exposed portion CP1 to third exposed portion CP3) exposed from the surface of the base component 8, and an embedded portion EP (first embedded portion EP1 to third embedded portion EP3) embedded in the inside of the base component 8. In addition, the first conductive component CM1 has a first terminal portion TM1, a first exposed portion CP1, and a first embedded portion EP1, the second conductive component CM2 has a second terminal portion TM2, a second exposed portion CP2, and a second embedded portion EP2, and the third conductive component CM3 has a third terminal portion TM3, four third exposed portions CP3, and a third embedded portion EP3.

[0043] The outer portion 7E of the first lower leaf spring 7A is fixed to the first exposed portion CP1 of the first conductive member CM1 by welding or the like, and the outer portion 7E of the second lower leaf spring 7B is fixed to the second exposed portion CP2 of the second conductive member CM2 by welding or the like. The four third exposed portions CP3 of the third conductive member CM3 are fixed to the lower end portions of the corners of the outer peripheral wall portion 4A of the cover member 4 by welding or the like. The outer peripheral wall portion 4A of the cover member 4 is fixed to the outer peripheral wall portion 1A of the case member 1 by welding or the like.

[0044] The terminal portion TM passes through a through hole 1T formed in the base portion 1B of the case member 1 (see Figure 4 ) protrudes downward and is connected to the conductor pattern of the substrate SB. Figure 4 1 is a top view and a bottom view of the housing member 1. Specifically, the through hole 1T is as shown in FIG. Figure 4As shown, the first through hole 1T1, the second through hole 1T2 and the third through hole 1T3 are included. The first terminal portion TM1 penetrates the first through hole 1T1 and protrudes downward, the second terminal portion TM2 penetrates the second through hole 1T2 and protrudes downward, and the third terminal portion TM3 penetrates the third through hole 1T3 and protrudes downward.

[0045] With this configuration, when the first terminal portion TM1 of the first conductive member CM1 is connected to a high potential and the second terminal portion TM2 of the second conductive member CM2 is connected to a low potential, the current flows to the first lower leaf spring 7A through the first terminal portion TM1, the first embedded portion EP1 and the first exposed portion CP1, and then flows to the first end portion 3A of the coil 3 through the outer portion 7E, the elastic arm portion 7G and the inner portion 7N of the first lower leaf spring 7A. Thereafter, the current that has passed through the coil 3 flows to the second lower leaf spring 7B through the second end portion 3B of the coil 3, and flows to the second conductive member CM2 through the inner portion 7N, the elastic arm portion 7G and the outer portion 7E of the second lower leaf spring 7B, and then flows to the second terminal portion TM2 through the second exposed portion CP2 and the second embedded portion EP2 of the second conductive member CM2. When the second terminal portion TM2 of the second conductive member CM2 is connected to a high potential and the first terminal portion TM1 of the first conductive member CM1 is connected to a low potential, the same is true except that the current flows in the opposite direction.

[0046] Therefore, the control device CTR can make current flow through the coil 3 and change the direction of the current flowing through the coil 3 by controlling the voltage applied to each of the first terminal portion TM1 and the second terminal portion TM2. Therefore, the control device CTR can use the force acting on the charged particles moving in the magnetic field generated by the magnet 5, that is, the Lorentz force, to move the movable side part MB (lens holding part 2) relative to the fixed side part FB (magnet 5) along the optical axis OA. Moreover, by moving the lens holding part 2 in this way, the control device CTR can realize an automatic focus adjustment function as one of the lens adjustment functions. Specifically, the control device CTR can move the lens holding part 2 in a direction away from the imaging element IS to achieve macro photography, and can move the lens holding part 2 in a direction close to the imaging element IS to achieve infinity photography.

[0047] In addition, if the third terminal portion TM3 of the third conductive component CM3 is grounded, the case member 1 and the cover member 4 are also grounded. This is because the four third exposed portions CP3 of the third conductive component CM3 are conductively connected to the lower end portions of the corner portions of the outer peripheral wall portion 4A of the cover member 4 by welding or the like, and the outer peripheral wall portion 4A of the cover member 4 is conductively connected to the outer peripheral wall portion 1A of the case member 1 by welding or the like.

[0048] Therefore, the control device CTR can remove the charged housing HS by controlling the grounding of the third terminal portion TM3. In addition, the control device CTR can realize the electromagnetic shielding function of the housing HS composed of the case member 1 and the cover member 4.

[0049] In the example shown in the figure, the frame HS is configured such that the outer peripheral wall portion 1A of the case member 1 is located outside the outer peripheral wall portion 4A of the cover member 4 , but the outer peripheral wall portion 1A of the case member 1 may be located inside the outer peripheral wall portion 4A of the cover member 4 .

[0050] Next, refer to Figure 4 as well as Figure 5 Next, a foreign matter capturing member FM, which is a member for capturing foreign matter in the housing HS of the lens driving device 101, will be described. Figure 4 1 is a diagram showing a configuration example of the housing member 1. Specifically, Figure 4 The above figure is a top view of the housing component 1. Figure 4 The lower figure is a bottom view of the shell component 1. Figure 5 is a cross-sectional view of the lens driving device 101. Specifically, Figure 5 The above picture is viewed from the X1 side. Figure 1 FIG. 1 is a diagram showing a cross section of the lens driving device 101 on a virtual plane that is parallel to the YZ plane and is along the dotted line L1. Figure 5 The following figure is from Figure 5 An enlarged view of the range R1 enclosed by the dotted line in the above figure.

[0051] The foreign matter capturing component FM is a component that prevents foreign matter in the frame HS of the lens driving device 101 from reaching the imaging element IS through the opening 1K of the housing component 1, and is also called dust-catching gel or dust-proof adhesive. The foreign matter is typically dust generated in the frame HS of the lens driving device 101, such as abrasion powder generated when the movable side component MB (lens holding component 2) contacts the fixed side component FB (cover component 4 or base component 8, etc.). In addition, the foreign matter includes dust generated outside the frame HS of the lens driving device 101 and intruding into the frame HS.

[0052] The housing component 1 is as follows Figure 4 As shown in FIG. 1 , the base 1B and the cylindrical portion 1C protruding upward (Z1 side) from the inner edge of the base 1B and arranged outside the opening 1K. Figure 5 As shown in the figure below, an adhesive foreign matter capturing member FM is arranged at the front end portion 1CT of the cylindrical portion 1C.

[0053] In the example shown in the figure, Figure 5As shown in the above figure, the cylindrical portion 1C is configured such that the tip end portion 1CT is located above the lower end portion of the lens body LS held by the lens holding member 2. However, the cylindrical portion 1C may be configured such that the tip end portion 1CT is located below the lower end portion of the lens body LS.

[0054] In the example shown in the figure, the cylindrical portion 1C is configured such that the tip end portion 1CT is located below the upper surface of the side portion 8E of the base member 8 , but the tip end portion 1CT may be located above the upper surface of the side portion 8E of the base member 8 .

[0055] In addition, in the example shown in the figure, the foreign matter capturing component FM is realized by solidifying the foreign matter capturing material RM, which is a synthetic resin material with fluidity, into a gel state. Specifically, the foreign matter capturing material RM is an adhesive made of synthetic resin, and is solidified into a gel state by being irradiated with ultraviolet rays in a state of being applied to the front end portion 1CT of the cylindrical portion 1C. The foreign matter capturing material RM solidified into a gel state exerts adhesiveness as the foreign matter capturing component FM. In addition, the foreign matter capturing material RM can also be a material that is solidified by a curing method other than ultraviolet curing, such as moisture curing, heat curing, or anaerobic curing.

[0056] The foreign matter capturing component FM is configured to have an appropriate height HT so that the foreign matter capturing component FM does not contact the movable side component MB (lens holding component 2 and lens body LS) when the movable side component MB (lens holding component 2 and lens body LS) moves, and foreign matter does not pass through the gap between the front end portion 1CT and the movable side component MB (lens holding component 2 and lens body LS) and enter the foreign matter opening 1K.

[0057] In addition, if Figure 5 As shown in the figure below, the housing member 1 is configured to form a gap GP between the cylindrical portion 1C and the base member 8 in the radial direction of a circle centered on the optical axis OA. According to this configuration, the housing member 1 can capture a portion of foreign matter into the space SP, and can prevent foreign matter from reaching the imaging element IS through the opening 1K. The space SP is a space formed between the upper surface of the base 1B of the housing member 1 and the lower surface of the base 8B of the base member 8.

[0058] The front end portion 1CT of the cylindrical portion 1C is as shown in FIG. Figure 4 As shown in the above figure, it is formed to be continuous in a circular ring shape throughout the entire circumference of the cylindrical portion 1C. Moreover, the foreign matter capture component FM is arranged on the front end portion 1CT in a manner to be continuous in a circular ring shape throughout the entire circumference of the cylindrical portion 1C. However, the front end portion 1CT of the cylindrical portion 1C can also be formed to include a local recessed portion or a convex portion. Even in this case, the foreign matter capture component FM is also expected to be set to be continuous in a circular ring shape throughout the entire circumference of the cylindrical portion 1C.

[0059] In addition, the cylindrical portion 1C is Figure 4As shown in the above figure, it is formed into a circular ring shape when viewed from above, but it can also be formed into a polygonal ring shape such as a square ring shape, a hexagonal ring shape, or an octagonal ring shape when viewed from above, and it can also be formed into other shapes such as an elliptical ring shape when viewed from above. In addition, in the example shown in the figure, the housing member 1 is configured to have a cylindrical cylindrical portion 1C extending along the optical axis OA, but it can also be configured to have a cylindrical cylindrical portion 1C. That is, the cylindrical portion 1C can also be formed so that the inner diameter of the front end portion 1CT is different from the inner diameter of the lower end portion 1CB.

[0060] Next, refer to Figure 6 , a procedure for providing the foreign matter capturing member FM at the front end portion 1CT of the cylindrical portion 1C of the housing member 1 will be described. Figure 6 1 is a diagram showing the sequence for setting the foreign matter capturing member FM at the front end portion 1CT. Specifically, Figure 6 The four diagrams (first state diagram to fourth state diagram) indicated by block arrows in the figure show the state of the housing component 1 that changes with the passage of time. In addition, the first state diagram to the fourth state diagram include the following diagrams: Figure 4 The first state diagram and the second state diagram include a cross-sectional view of the housing member 1 in an upside-down state on a virtual plane parallel to the XZ plane and along the dotted line L2 in the lower figure. In addition, the first state diagram and the second state diagram include a cross-sectional view of the receiving member CR receiving the foreign matter capturing material RM.

[0061] The foreign matter capturing material RM is a synthetic resin material having fluidity, and is configured to be cured into a gel state when irradiated with ultraviolet rays UV, thereby becoming a foreign matter capturing member FM having adhesiveness.

[0062] The receiving component CR is a container for receiving the foreign matter capturing material RM, and is also referred to as a pool. In the illustrated example, the receiving component CR is a lidless box-shaped container having a cylindrical wall. Specifically, the receiving component CR has an outer diameter that is larger than the inner diameter of the opening 1K of the shell component 1 and smaller than the width of the outer shape of the shell component 1. That is, as shown in the second state diagram, the receiving component CR is constructed so that the fluid surface (liquid surface) of the foreign matter capturing material RM will not adhere to the portion other than the front end portion 1CT of the tubular portion 1C, and the liquid surface of the foreign matter capturing material RM can only adhere to the front end portion 1CT.

[0063] First, as shown in the first state diagram, the case member 1 is moved to a position directly above the receiving member CR in a state in which it is inverted upside down.

[0064] After that, the housing member 1 is lowered so that the front end portion 1CT of the cylindrical portion 1C is attached to the liquid surface of the foreign matter capturing material RM accommodated in the accommodation member CR. As shown in the second state diagram, the front end portion 1CT is immersed in the foreign matter capturing material RM accommodated in the accommodation member CR. In the example shown in the figure, the front end portion 1CT is not only attached to the front end surface but also to the foreign matter capturing material RM. Figure 5 As shown in the figure below, the foreign matter capturing material RM is immersed in the foreign matter capturing material RM in a manner that it is attached to the inner surface 1CN and the outer surface 1CE.

[0065] After that, the front end portion 1CT to which the foreign matter capturing material RM is attached is lifted from the liquid surface of the foreign matter capturing material RM and moved to the position directly above the light source SR capable of emitting ultraviolet light UV. In addition, the foreign matter capturing material RM is attached to the front end portion 1CT lifted from the liquid surface of the foreign matter capturing material RM. Through this sequence, the foreign matter capturing material RM is applied to the front end portion 1CT of the cylindrical portion 1C. This process of applying the foreign matter capturing material RM to the front end portion 1CT is called a coating process.

[0066] After that, the front end portion 1CT to which the foreign matter capturing material RM is attached is irradiated with ultraviolet light UV from the light source SR as shown in the third state diagram. The foreign matter capturing material RM irradiated with ultraviolet light UV is solidified into a gel state and becomes an adhesive foreign matter capturing component FM as shown in the fourth state diagram. Through this sequence, the foreign matter capturing material RM applied to the front end portion 1CT is solidified. This process in which the foreign matter capturing material RM is solidified is called a curing process.

[0067] Moreover, through this series of procedures, the foreign matter capturing material RM is applied to the front end portion 1CT of the cylindrical portion 1C of the shell member 1, and the foreign matter capturing material RM applied to the front end portion 1CT is irradiated with ultraviolet rays UV to become a gel-like foreign matter capturing member FM with adhesiveness.

[0068] Next, refer to Figure 7 Another procedure for providing the foreign matter capturing member FM at the front end portion 1CT of the cylindrical portion 1C of the housing member 1 will be described. Figure 7 1 is a diagram showing another procedure for setting the foreign matter capturing member FM at the front end portion 1CT. Specifically, Figure 7 The six figures (first state figure to sixth state figure) indicated by the block arrows in the figure show the state of the housing member 1 changing with the passage of time. In addition, the third state figure to the sixth state figure include the state of the housing member 1 as viewed from the Y1 side. Figure 4 The figure is a cross-sectional view of the shell component 1 on a virtual plane parallel to the XZ plane and along the dotted line L3 in the above figure. In addition, the first state figure and the second state figure include a cross-sectional view of the receiving component CR that receives the foreign matter capturing material RM, and the first state figure to the fourth state figure include a cross-sectional view of the die ST.

[0069] The stamper ST is a component used when attaching the foreign matter capturing material RM to the front end portion 1CT of the cylindrical portion 1C of the housing member 1, and is equivalent to a pad printing head used in soft printing (pad printing). In the example shown in the figure, the stamper ST is a bottomless box-shaped component having a cylindrical wall surface, and has a base BS and a cylindrical portion SC protruding downward (Z2 side) from the outer edge of the base BS.

[0070] First, the stamper ST moves to a position just above the receiving member CR as shown in the first state diagram.

[0071] Then, the die ST descends to make the tip SCT of the tubular portion SC adhere to the fluid surface (liquid surface) of the foreign matter capturing material RM accommodated in the accommodating member CR. Then, the tip SCT is immersed in the foreign matter capturing material RM accommodated in the accommodating member CR as shown in the second state diagram.

[0072] After that, the front end portion SCT to which the foreign matter capturing material RM is attached is lifted from the liquid surface of the foreign matter capturing material RM and moved to the top of the shell member 1. Specifically, as shown in the third state diagram, the die ST is configured such that the front end portion SCT of the cylindrical portion SC is opposed to the front end portion 1CT of the cylindrical portion 1C of the shell member 1 in the up-down direction.

[0073] Then, the stamper ST descends to bring the front end SCT of the cylindrical portion SC into contact with the front end 1CT of the cylindrical portion 1C. When the stamper ST descends, the front end SCT to which the foreign matter capturing material RM is attached comes into contact with the front end 1CT as shown in the fourth state diagram.

[0074] Afterwards, the stamper ST is separated from the case member 1 , but the foreign matter capturing material RM attached to the front end portion SCT of the cylindrical portion SC is transferred to the front end portion 1CT of the case member 1 , and the front end portion 1CT is in a state where the foreign matter capturing material RM is attached.

[0075] Through this procedure, the foreign matter capturing material RM is applied to the front end portion 1CT of the cylindrical portion 1C. This step of applying the foreign matter capturing material RM to the front end portion 1CT is called a coating step.

[0076] Thereafter, the housing member 1 is moved to be directly below the light source SR capable of emitting ultraviolet rays UV.

[0077] After that, the front end portion 1CT to which the foreign matter capturing material RM is attached is irradiated with ultraviolet light UV from the light source SR as shown in the fifth state diagram. The foreign matter capturing material RM irradiated with ultraviolet light UV is solidified into a gel state and becomes an adhesive foreign matter capturing component FM as shown in the sixth state diagram. Through this sequence, the foreign matter capturing material RM applied to the front end portion 1CT is solidified. This process in which the foreign matter capturing material RM is solidified is called a curing process.

[0078] Moreover, through this series of procedures, the foreign matter capturing material RM is applied to the front end portion 1CT of the cylindrical portion 1C of the shell member 1, and the foreign matter capturing material RM applied to the front end portion 1CT is irradiated with ultraviolet rays UV to become a gel-like foreign matter capturing member FM with adhesiveness.

[0079] As described above, the lens driving device 101 according to the embodiment of the present disclosure is Figure 1 As shown, it comprises: a lens holding component 2 capable of holding a lens body LS as an example of an optical element; a base component 8 having an opening 8K extending through in the up-down direction and arranged corresponding to (opposite to) the lens body LS; a driving portion DM for moving the lens holding component 2 relative to the base component 8; and a supporting component (shell component 1) for supporting the base component 8. In the present embodiment, the supporting component is composed of a shell component 1 capable of accommodating at least a portion of the base component 8. The supporting component (shell component 1) has a base portion 1B arranged on the lower side (Z2 side) of the base component 8 (on the side opposite to the side where the lens holding component 2 is arranged) and a cylindrical portion 1C protruding upward from the inner edge portion of the base portion 1B and arranged on the inner side of the opening 8K. Furthermore, as shown in Figure 5 As shown, an adhesive foreign matter capturing member FM is disposed at the front end portion 1CT of the cylindrical portion 1C.

[0080] With this configuration, the lens driving device 101 can prevent foreign matter such as garbage, dust, or abrasion powder from reaching the imaging element IS through the opening 8K of the base member 8. This is because the adhesive foreign matter capturing member FM provided at the front end portion 1CT of the cylindrical portion 1C of the housing member 1, which is the supporting member located inside the opening 8K of the base member 8, can capture foreign matter. Furthermore, the foreign matter capturing member FM is disposed on a narrow entry path between the supporting member (housing member 1) and the lens body LS through which foreign matter can pass.

[0081] In the example shown in the figure, the driving unit DM is composed of a voice coil motor including the coil 3 and the magnet 5 , but may be composed of other components such as a shape memory alloy wire or a piezoelectric element.

[0082] In addition, the foreign matter capture component FM is as follows Figure 5 As shown, the conductive layer may be disposed not only at the front end portion 1CT of the cylindrical portion 1C but also at the inner surface 1CN and the outer surface 1CE located on the front end side of the cylindrical portion 1C.

[0083] This configuration has an effect of making it difficult for foreign matter to enter the imaging element IS side, that is, more reliably suppressing foreign matter from reaching the imaging element IS, compared to a configuration in which the foreign matter capturing member FM is disposed only at the front end portion 1CT.

[0084] In addition, the supporting member can also be formed by a housing member 1 formed of a metal plate, such as Figure 5 As shown, a gap GP may be provided between an inner surface 8N of the base member 8 facing the opening 1K and an outer surface 1CE of the cylindrical portion 1C.

[0085] The composition is as Figure 5 As shown in the figure below, foreign matter can be captured into the space SP through the gap GP, that is, foreign matter can be captured not only by the foreign matter capturing member FM but also between the base member 8 and the cylindrical portion 1C of the housing member 1, thereby having the effect of more reliably suppressing foreign matter from reaching the imaging element IS. In addition, this configuration having the housing member 1 formed of a metal plate can reduce the thickness of the housing member 1 (cylindrical portion 1C) compared to the case where the housing member 1 is formed of a synthetic resin or the like, thereby having the effect of suppressing the inner diameter of the opening 1K for exposing the imaging element IS from becoming smaller due to the thickness of the cylindrical portion 1C.

[0086] In addition, if Figure 2 As shown, the housing member 1 as a supporting member may also have an outer peripheral wall portion 1A located outside the base member 8. Furthermore, the housing member 1 formed of a metal plate may also constitute a frame body HS together with the cover member 4 formed of a metal plate. In this case, the housing member 1 and the cover member 4 may also be connected to each other.

[0087] This configuration is different from a configuration in which at least one of the case member 1 and the cover member 4 is formed of a material other than a metal plate, and has an effect of being able to have an electromagnetic shielding function.

[0088] In addition, the front end portion 1CT of the cylindrical portion 1C is as shown in FIG. Figure 4 As shown in FIG. 1 , the foreign matter capturing member FM may be formed to be continuous in an annular shape over the entire circumference of the cylindrical portion 1C. Furthermore, the foreign matter capturing member FM may be formed to be continuous in an annular shape over the entire circumference of the cylindrical portion 1C.

[0089] This configuration has an effect of making it difficult for foreign matter to enter the imaging element IS side, that is, more reliably suppressing foreign matter from reaching the imaging element IS, compared with a configuration in which the foreign matter capturing member FM is intermittently provided along the front end portion 1CT of the cylindrical portion 1C.

[0090] In addition, the manufacturing method of the lens driving device 101 according to the embodiment of the present disclosure is as follows: Figure 6 Or Figure 7 As shown, there are a coating step of coating a foreign matter capturing material RM which is a synthetic resin material having fluidity on the front end portion 1CT of the cylindrical portion 1C, and a curing step of curing the foreign matter capturing material RM to form a foreign matter capturing member FM having adhesiveness.

[0091] The lens driving device 101 manufactured by this manufacturing method can prevent foreign matter such as dust, or abrasion powder from reaching the imaging element IS through the opening 8K of the base member 8. This is because the adhesive foreign matter capturing member FM provided at the front end portion 1CT of the cylindrical portion 1C of the housing member 1, which is a supporting member located inside the opening 8K of the base member 8, can capture foreign matter.

[0092] Furthermore, the method for manufacturing the lens driving device 101 may include a combining step of combining the base member 8 and the housing member 1 , which is a supporting member, after the curing step.

[0093] This manufacturing method has an effect of being able to suppress the foreign matter capturing material RM from being attached to the base member 8 when the base member 8 and the case member 1 are combined. This is because the foreign matter capturing material RM is already solidified during the combining step.

[0094] In addition, the coating process such as Figure 6 As shown in the second state diagram, this can also be achieved by bringing the inverted (upside down) supporting member, namely the front end portion 1CT of the cylindrical portion 1C of the housing member 1 into contact with the foreign matter capturing material RM stored in the receiving member CR.

[0095] This manufacturing method has an effect of improving workability compared to a manufacturing method including a step of applying the foreign matter capturing material RM to the front end portion 1CT using a nozzle, etc. That is, this manufacturing method has an effect of making it easy to apply the foreign matter capturing material RM to the front end portion 1CT.

[0096] Alternatively, the curing process may be Figure 6 As shown in the third state diagram of FIG. 1 , the ultraviolet rays UV are irradiated to the front end portion 1CT in a state where the supporting member, namely the housing member 1, is turned upside down.

[0097] This manufacturing method has an effect of improving workability compared to a manufacturing method including a step of returning the inverted housing member 1 to its original position before irradiating the front end portion 1CT with ultraviolet rays UV.

[0098] In addition, the coating process such as Figure 7 As shown, it can also be done by transfer printing. Figure 7 In the example shown, in the coating step, the foreign matter capturing material RM adhering to the front end portion SCT of the cylindrical portion SC of the stamper ST is transferred to the front end portion 1CT of the case member 1 .

[0099] This manufacturing method has an effect of improving workability compared to a manufacturing method including a step of applying the foreign matter capturing material RM to the front end portion 1CT using a nozzle, etc. This is because the foreign matter capturing material RM attached to the front end portion SCT of the cylindrical portion SC of the stamp ST is transferred to the front end portion 1CT of the case member 1 simply by bringing the front end portion SCT of the cylindrical portion SC of the stamp ST into contact with the front end portion 1CT of the cylindrical portion 1C of the case member 1.

[0100] The preferred embodiments of the present disclosure are described in detail above. However, the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments can be applied in various modifications or substitutions without departing from the scope of the present invention. In addition, the features described with reference to the above-mentioned embodiments can also be appropriately combined as long as they are not technically contradictory.

[0101] Description of Reference Numerals

[0102] 1···Casing member 1A···Outer peripheral wall portion 1A1···First side plate portion 1A2···Second side plate portion 1A3···Third side plate portion 1A4···Fourth side plate portion 1B···Base portion 1C···Cylinder portion 1CB···Lower end portion 1CE···Outer surface 1CN···Inner surface 1CT···Front end portion 1K···Opening 1T···Through hole 1T1···First through hole 1T2···Second through hole 1T3···Third through hole 2···Lens holding member 2C···Cylinder portion 2D···Upper pedestal portion 2E···Outer peripheral portion 2F···Lower pedestal portion 3···Coil 3A···First end part 3B···second end part 4···cover part 4A···outer wall part 4A1···first side plate part 4A2···second side plate part 4A3···third side plate part 4A4···fourth side plate part 4B···top plate part 4K···opening 5···magnet 5A···first magnet 5B···second magnet 5C···third magnet 5D···fourth magnet 6···upper leaf spring 6E···outer part 6G···elastic arm part 6N···inner part 7···lower leaf spring 7A···first lower leaf spring 7B···second lower leaf spring 7E···outer part 7G···elastic arm part 7N···inner part 8· ··Base member 8B···Base 8D···Fixed side pedestal portion 8E···Side 8E1···First side 8E2···Second side 8E3···Third side 8E4···Fourth side 8K···Opening 8N···Inner surface 101···Lens driving device BS···Base CD···Camera module CM···Conductive component CM1···First conductive component CM2···Second conductive component CM3···Third conductive component CP···Exposed portion CP1···First exposed portion CP2···Second exposed portion CP3···Third exposed portion CR···Accommodating component CTR···Control device DM ···Driving part EP···Embedded part EP1···First embedded part EP2···Second embedded part EP3···Third embedded part FB···Fixed side part FM···Foreign matter capturing part GP···Gap HS···Frame IS···Shooting element LS···Lens body MB···Movable side part OA···Optical axis RM···Foreign matter capturing material SB···Substrate SC···Cylinder part SCT···Front end part SP···Space SR···Light source ST···Mold TM···Terminal part TM1···First terminal part TM2···Second terminal part TM3···Third terminal part UV···Ultraviolet light

Claims

1. A lens driving device, characterized in that: have: A lens holding component capable of holding the lens body; a base member having an opening provided corresponding to the lens body and extending through the lens body in the up-down direction; and a driving unit for moving the lens holding member relative to the base member, The lens driving device includes a supporting member that supports the base member. The support member includes a base portion disposed on a lower side of the base member and a cylindrical portion protruding upward from an inner edge portion of the base portion and disposed inside the opening. An adhesive foreign matter capturing member is disposed at the front end portion of the cylindrical portion.

2. The lens driving device according to claim 1, characterized in that: The foreign matter capturing member is also arranged on the inner surface and the outer surface located on the front end side of the cylindrical portion.

3. The lens driving device according to claim 1 or 2, characterized in that: The support member is formed of a case member formed of a metal plate, and has a gap between an inner surface of the base member facing the opening and an outer surface of the cylindrical portion.

4. The lens driving device according to claim 1 or 2, characterized in that: The support member is formed by a housing member formed of a metal plate. The housing member has an outer peripheral wall portion located outside the base member, and constitutes a frame together with a cover member formed of a metal plate. The housing component and the cover component are in electrical communication with each other.

5. The lens driving device according to claim 1 or 2, characterized in that: The foreign matter capturing member is provided so as to be continuous in an annular shape over the entire circumference of the cylindrical portion.

6. A camera module, characterized in that: have: The lens driving device according to any one of claims 1 to 5; the lens body; and A photographing element is opposite to the lens body.

7. A method for manufacturing a lens driving device, characterized in that: The lens driving device comprises: A lens holding component capable of holding the lens body; a base member having an opening provided corresponding to the lens body and extending through the lens body in the up-down direction; and a driving unit for moving the lens holding member relative to the base member, The lens driving device includes a supporting member that supports the base member. The support member includes a base portion disposed on a lower side of the base member and a cylindrical portion protruding upward from an inner edge portion of the base portion and disposed inside the opening. The manufacturing method of the lens driving device comprises: a coating step of coating a foreign matter capturing material made of a synthetic resin having fluidity on the front end portion of the cylindrical portion; and The curing step is to cure the foreign matter capturing material to form a foreign matter capturing member having adhesiveness.

8. The method for manufacturing a lens driving device according to claim 7, wherein: After the curing step, there is a combining step of combining the base member and the support member.

9. The method for manufacturing a lens driving device according to claim 7 or 8, characterized in that: The coating step is performed by bringing the front end portion of the cylindrical portion of the inverted support member into contact with the foreign matter capturing material stored in the storage member.

10. The method for manufacturing a lens driving device according to claim 9, wherein: The curing step is performed by irradiating ultraviolet rays toward the front end portion in a state where the support member is turned upside down.

11. The method for manufacturing a lens driving device according to claim 7 or 8, characterized in that: The coating step is performed by transfer.

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