JP2011028180A - Lens driving device and camera module including the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lens driving device configured to prevent a radio wave noise from leaking to the outside the lens driving device, and to provide a camera module including the lens driving device. <P>SOLUTION: The lens driving device includes: a base 30 having a nearly planar base 31 and support rod parts extending from the base 31; a case 40 attached to the base 30; coils 60 each formed by winding a conductive wire on the support rod part; a holder 10 which is stored in an inner space formed by the base 30 and the case 40, and which holds lenses; and magnets 20 secured to the holder. In the lens driving device, the case 40 is composed of a metal material, and on the case 40, side plates 42 which surround the case 40 from the outside of the coils 60 in a radial direction are disposed. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lens driving device that includes a base having a base, a case attached to the base, and a holder that holds the lens while being housed in an internal space formed by the base and the case.

  In recent years, a camera mounted on a mobile phone has been increased in the number of pixels and has become an essential function. In order to perform autofocus of this camera, a lens driving device that moves the lens in the optical axis direction is used. On the other hand, with the reduction in thickness and size of mobile phones, there is an increasing demand for reducing the space provided to the lens driving device. In order to respond to this requirement, as a structure for driving the lens of the lens driving device, for example, a voice coil type structure as in Patent Document 1 is adopted. This voice coil type structure can be simplified in comparison with a structure using a general stepping motor, so that it is known that the lens driving device can be miniaturized.

  In the above voice coil type structure, a coil is mounted on the holder side that holds the lens, a magnet is mounted on the base side, and the holder is attached to the optical axis of the lens by electromagnetic driving force generated by applying current to the coil. Moving in the direction. Further, the holder is supported by a spring member, and the spring member is shared for power supply to the coil so that the wiring is not drawn from the holder (see, for example, Patent Document 1).

  According to this configuration, since the wiring for supplying power to the coil is not pulled out from the holder, the problem that the wiring is damaged due to unnecessary vibration or tension applied to the wiring when the lens is moved is suppressed. Can do. On the other hand, in this configuration, since the structure of the spring member is complicated, there arises a problem that the yield at the time of manufacturing the lens driving device tends to be lowered.

  As a configuration for solving such a problem, a configuration in which a magnet is mounted on the holder side and a coil is mounted on the base side is conceivable. In this configuration, since it is not necessary to wire the holder, it is possible to prevent the wiring from being damaged during the movement of the lens and simplify the configuration of the lens driving device by removing the spring member (for example, Patent Document 2).

With reference to FIG. 14, the configuration of a conventional voice coil type lens driving device will be described.
As shown in FIG. 14, the lens driving device 100 is provided with a base 110. A side cover 130 is fitted to the base 110. An upper cover 120 is fitted to the side cover 130 on the side opposite to the base 110. The base 110, the side cover 130, and the upper cover 120 constitute an outer frame of the lens driving device 100. A holder 140 that holds the lens G is housed in an internal space S formed by the base 110, the upper cover 120, and the side cover 130.

  Each of the base 110 and the upper cover 120 is formed with coils 150 and 151 formed by winding a conductive wire. A magnet 160 is arranged between the coils 150 and 151 in the optical axis direction of the lens G. The magnet 160 is fixed to the holder 140. The side cover 130 is disposed outside the coils 150 and 151 in the radial direction of the lens G so as to surround the coils 150 and 151.

  By energizing one or both of the coils 150 and 151, a magnetic circuit is formed between the coils 150 and 151 and the magnet 160. Due to the action of the magnetic circuit, the holder 140 and the lens G move in the optical axis direction.

JP 2004-280031 A JP 2005-148586 A

  By the way, in the conventional structure, the side cover 130 surrounding the coils 150 and 151 from the outer side in the radial direction is formed of a resin material. In this case, radio wave noise (hereinafter referred to as “radio wave noise”) generated due to the side cover 130 energizing each of the coils 150 and 151 leaks outward from the side cover 130 in the radial direction. Is difficult to suppress. As a result, the radio noise may leak outside the lens driving device 100.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a lens driving device that suppresses leakage of radio noise to the outside of the lens driving device, and a camera module including the lens driving device. It is.

  In order to achieve the above object, the invention according to claim 1 is directed to a base having an opening for exposing a lens, a base having a support extending from the base, a case attached to the base, and the support. A coil formed by winding a conductive wire around the part, a holder that is housed in an internal space formed by the base and the case and holds the lens, and a magnet fixed to the holder, In the lens driving device in which the holder moves in an optical axis direction that is a direction along the optical axis of the lens, the case is made of a metal material, and the case is formed outward of the lens in the radial direction from the coil. The gist of the invention is that a side plate is provided.

  According to the present invention, since the case surrounds from the outside in the radial direction of the lens from the coil and is made of a metal material, it is possible to suppress leakage of radio wave noise from the lens driving device to the outside. become.

  According to a second aspect of the present invention, in the lens driving device according to the first aspect, the lens driving device is disposed outward in the radial direction from the coil, and is opposed to the magnet in the radial direction. The side plate is provided with a concave portion recessed outward in the radial direction, the magnetic plate is accommodated in the concave portion, and the side plate surrounds the lens from the radial direction. The gist is to enclose the entire circumference of the coil from the outside in the radial direction.

According to the present invention, since the side plate surrounds the entire circumference of the coil in the circumferential direction, it is possible to suppress leakage of radio wave noise from the lens driving device to the outside.
By the way, as a structure which provides a magnetic plate accommodating part in a case, the structure which provides the notch which penetrates a side plate to radial direction in a side plate, and accommodates a magnetic plate in this notch can be considered. However, in this configuration, radio noise may leak from between the magnetic plate and the notch. In that respect, in the present invention, the side plate is not provided with the notch, and thus leakage of the radio noise caused by the notch can be suppressed.

  According to a third aspect of the present invention, in the lens driving device according to the second aspect, the radially outer surface of the side plate is formed flush with the side plate, and the concave portion is provided with the concave portion. The inner surface in the radial direction is provided as a concave shape that is outward in the radial direction with respect to the inner surface in the radial direction of the other part of the side plate.

  According to this invention, since the outer surface of the side plate is flush and the recess has a configuration in which only the inner surface of the side plate is recessed, the side plate is prevented from expanding radially outward to provide the recess. Will be able to.

  The gist of the invention according to claim 4 is the lens driving device according to any one of claims 1 to 3, wherein the case is formed by pressing a metal plate.

  According to the present invention, the case is formed by pressing the metal plate, so that the case is formed by cutting the metal material, and the case is formed by casting the metal material. The case can be manufactured at a low cost. In particular, compared with the case of casting a metal material, the thickness of the side plate of the case can be reduced, so that the case can be downsized in the radial direction.

  According to a fifth aspect of the present invention, in the lens driving device according to any one of the first to fourth aspects, the base portion is formed in a substantially square shape in plan view, and is attached to the base portion of the side plate. The end portion is formed in a substantially square ring shape in a plan view in the optical axis direction, and the base portion and the side plate are provided with a positioning portion that determines a mounting direction in the circumferential direction of the side plate with respect to the base portion. The gist.

  According to this invention, since the mounting direction of the side plate with respect to the base is determined by providing the positioning portion on the base and the side plate, it is possible to suppress the worker from attaching the case to the base in the wrong direction. Will be able to.

  For example, when the case is attached to the base in a state where the magnetic plate is attached to the case, the side plate provided with the concave portion that houses the magnetic plate of the case and the base portion where the magnetic plate is disposed do not coincide with each other. And the magnetic plate may interfere with each other. As a result, due to the interference between the magnetic plate and the base, there arises a problem that the lens driving device is assembled with the magnetic plate deformed. In that respect, in the present invention, the positioning part suppresses the operator from attaching the case to the base in the wrong direction, so that the occurrence of the above problem can be suppressed.

  According to a sixth aspect of the present invention, in the lens driving device according to any one of the first to fifth aspects, the case is in contact with the base at the outer side in the radial direction than the coil. The gist of the invention is that a contact avoiding portion for avoiding contact between the case and the coil is provided.

  According to the present invention, since the contact avoiding portion is provided in the base, the case comes into contact with the contact avoiding portion before contacting the coil, and the case and the coil are mechanically avoided from contacting each other. . Therefore, the short circuit of the coil due to the contact between the case and the coil can be reliably suppressed.

  By the way, when miniaturizing a lens drive device, it is necessary to closely arrange each member which comprises a lens drive device. Thereby, the coil and the case surrounding the coil may be close to each other. Therefore, when the case is attached to the base, the coil and the case may come into contact with each other due to an assembly error or the like. In particular, since the case is made of a metal material, the coil may be short-circuited due to contact between the coil and the case. In that respect, since the contact between the coil and the case is avoided by the contact avoiding portion, the present invention suppresses the short circuit of the coil caused by the contact between the coil and the case even if the lens driving device is downsized. Will be able to.

  According to a seventh aspect of the present invention, in the lens driving device according to any one of the first to sixth aspects, an end on the other end side which is the base side in the optical axis direction of the side plate and the end And the base portion facing the optical axis direction are fixed to each other by an adhesive, and an adhesive reservoir in which the adhesive accumulates at least one of the end portion of the side plate and the base portion. Is provided.

  According to this invention, since the space between the side plate and the base portion of the case is fixed by the adhesive, the bonding strength between the base and the case can be further improved. In addition, since the adhesive reservoir is provided on at least one of the side plate and the base, the bonding area between the side plate and the base increases, so that the bonding strength between the side plate and the base can be improved.

  According to an eighth aspect of the present invention, in the lens driving device according to the seventh aspect, a bent portion that is bent outward in a radial direction of the lens is provided at the end portion of the side plate, and the bent portion is provided. The gist of the present invention is that an adhesive reservoir for storing the adhesive is provided between an inner portion in the radial direction and the portion of the base.

  According to the present invention, the adhesive reservoir portion is further formed between the bent portion and the base portion, so that the adhesion area between the side plate and the base portion is further increased. Therefore, the joint strength between the side plate and the base can be further improved.

  In particular, when the case is formed by pressing a metal plate, a bent portion is provided when separating the portion formed as the case from the metal plate. Since the adhesive reservoir portion is provided between the bent portion and the base portion, it is possible to omit forming a dedicated shape for providing the adhesive reservoir portion.

  According to a ninth aspect of the present invention, in the lens driving device according to any one of the first to eighth aspects, the case has an opening for opening the lens and is connected to the side plate. The gist is that a top plate is provided, and the side plate and the top plate are configured as a single member.

  According to the present invention, since the side plate and the top plate are composed of a single member, out of the radio noise, in addition to the radio noise toward the side plate, the radio noise toward the top plate is prevented from leaking outside the case. Will be able to.

  By the way, as a structure of a case which has a top plate and a side plate, the structure from which a side plate and a top plate become another member can be considered. In this case, the radio wave noise of the coil may leak from the joint between the side plate and the top plate. In that respect, in the present invention, since the side plate and the top plate are formed of a single member, the above-described seam does not exist. Therefore, compared with the case where the side plate and the top plate are configured as separate members, it is possible to suppress leakage of radio wave noise from the case to the outside.

The gist of the invention described in claim 10 is a camera module including the lens driving device according to any one of claims 1 to 9.
According to the present invention, the lens driving device can be suitably applied to the camera module.

  ADVANTAGE OF THE INVENTION According to this invention, the lens drive device which suppresses that the electromagnetic wave noise of a coil leaks outside the lens drive device, and a camera module provided with the same can be provided.

The perspective view which shows the disassembled perspective structure of the lens drive device about one Embodiment which actualized the lens drive device which concerns on this invention. About the lens drive device of the embodiment, (a) a perspective view showing a perspective structure of the case, (b) a perspective view showing a perspective structure of the case viewed from a direction different from (a), (c) a side plate of the case Sectional drawing which shows a cross-sectional structure. The schematic diagram which shows each process by which a case is shape | molded by press work from the metal plate (a)-(e) about the lens drive device of the embodiment. About the lens drive device of the embodiment, (a) A perspective view showing a perspective structure in a state where a magnetic plate is attached to a case, (b) a plan view showing a bottom surface structure in a state where a magnetic plate is attached to the case. (A) A perspective view showing a perspective structure of a base, (b) A perspective view showing a perspective structure of a base viewed from a direction different from (a). About the lens drive device of the embodiment, (a) a perspective view showing a perspective structure in a state where the case is attached to the base, (b) a side view showing a side structure in a state where the case is attached to the base, (c) Sectional drawing which shows the cross-section of a side plate and a base in the state where the case was attached to the base. About the lens drive device of the embodiment, (a) a perspective view showing a perspective structure in a state where the case is attached to the base, (b) a side view showing a side structure in a state where the case is attached to the base, (c) The side view which shows the side structure seen from the direction different from (b). (A) Sectional drawing which shows the cross-sectional structure of the lens driving device, (b) The enlarged view which shows the enlarged structure which expanded a part of (a) about the lens drive device of the embodiment. The top view which shows the relationship between a holder and a magnetic board about the lens drive device of the embodiment. About the lens drive device of the embodiment, (a) A sectional view showing a sectional structure in a state where a movable body is located at a home position, (b) A sectional view showing a sectional structure in a state where the movable body is located at an on-focus position. The schematic diagram which shows the structure of the camera module carrying the lens drive device of the embodiment. (A) A perspective view showing a perspective structure of the lens driving device, (b) a side view showing a side structure of the lens driving device, and (c) (b) The side view which shows the side structure seen from a different direction. (A) The top view which shows the lower surface structure of a case about the other embodiment which actualized the lens drive device based on this invention, (b) The top view which shows the lower surface structure in the state in which the magnetic board was attached to the case. Sectional drawing which shows the cross-section of the lens drive device about the conventional lens drive device.

  1 to 11, an embodiment in which the lens driving device according to the present invention is embodied as a lens driving device used for autofocus of a camera mounted on a mobile phone will be described. Hereinafter, the direction along the optical axis of the lens is referred to as “optical axis direction”, the radial direction of the lens is referred to as “radial direction”, and the direction surrounding the lens from the radial direction is referred to as “circumferential direction”. Further, in the optical axis direction of the lens driving device 1, the side on which the base 30 is arranged is “downward”, and the side on which the case 40 is arranged is “upper”. In the radial direction of the lens driving device 1, the side toward the optical axis is “inward”, and the side away from the optical axis is “outward”.

First, the overall configuration of the lens driving device 1 will be described with reference to FIG.
As shown in FIG. 1, the lens driving device 1 includes a fixed body 1B fixed to a device on which the lens driving device 1 is mounted, and a moving body 1A that can move in the optical axis direction of the lens with respect to the fixed body 1B. Is configured to be stored. The lens driving device 1 performs autofocus of the camera by moving the lens in the optical axis direction as the moving body 1A moves in the optical axis direction. In addition, the lens driving device 1 of the present embodiment is formed in a square of about 8.5 mm in a plan view in the optical axis direction, and the height of the lens driving device 1 in the optical axis direction is formed to be about 3 mm. ing.

  The moving body 1A includes a cylindrical lens holder RH that holds a lens (not shown), a substantially octagonal holder 10 in plan view, and a plate-like magnet 20. Specifically, the lens holder RH is fixed to the opening portion 11 which is a substantially circular through hole in a plan view and penetrates the holder 10 in the optical axis direction at the center portion of the holder 10. Further, four magnets 20 are fixed to the outer side of the holder 10 in the radial direction through a certain distance in the circumferential direction. The magnets 20 are neodymium magnets (Ne-Fe-B).

  The fixed body 1B includes a base 30 and a case 40 that constitute an outer frame of the lens driving device 1, two cylindrical shafts 50 and 51, a coil 60 that forms a magnetic field by applying an electric current, and two It is comprised by the rectangular plate-shaped magnetic plates 70 and 71. FIG.

  Specifically, the base 30 is provided with a square base 31 having an opening 31a for exposing the lens at the center in a plan view that constitutes the lower surface of the outer frame of the lens driving device 1. At four corners of the base 31, support columns 32 extending from the base 31 along the optical axis direction are provided. Two magnetic plates 70 and 71 are fixed at two central positions of the sides constituting the periphery of the base 31.

  A coil 60 is formed on the support column 32 by winding a conductive wire so as to surround the four support columns 32 in the circumferential direction. The coil 60 includes a first coil 61 formed by winding a conductive wire in one direction in the circumferential direction, and the conductive wire wound in a direction opposite to the circumferential direction of the first coil 61. The second coil 62 is formed by being rotated.

  The case 40 is provided with a square top plate 41 that constitutes the upper surface of the outer frame of the lens driving device 1 and has a central opening 41a that is substantially circular in plan view at the center. A side plate 42 that extends downward from the top plate 41 in the optical axis direction and forms the side surface of the outer frame of the lens driving device 1 is provided on the outer peripheral edge of the top plate 41. The case 40 is attached to the base 30 such that the side plate 42 surrounds the outer side of the coil 60 in the radial direction.

  Next, the structure and manufacturing method of the case 40 will be described with reference to FIGS. The case 40 of this embodiment is configured as a single member by pressing a nonmagnetic metal plate.

  As shown in FIG. 2A, the side plate 42 of the case 40 is provided with four plane portions 421 having a planar shape along the circumferential direction and the optical axis direction. Between the respective circumferential directions of these flat portions 421, there are provided connecting portions 422 that connect the flat portions 421 and are bent into a curved shape. Further, the side plate 42 is formed in a substantially square ring shape in plan view in the optical axis direction (see FIG. 2B).

  A central opening 41a, which is a through hole for exposing the lens, is provided at the center of the top plate 41 of the case 40. In addition, at the four corners of the top plate 41 of the case 40, openings 41b that are circular through-holes in plan view are provided through the top plate 41 in the optical axis direction. Moreover, the outer surface 42a of each plane part 421 of the side plate 42 of the case 40 is provided flush with the circumferential direction.

  As shown in FIG. 2B, at the center position in the circumferential direction of the two sides of the side plate 42, a concave radial recess 42c that is recessed radially outward from the inner surface 42b of the flat portion 421 of the side plate 42. Are provided. At the lower end of the radial recess 42c in the optical axis direction, there is provided an optical axis recess 42d that is recessed upward in the optical axis direction.

  As shown in FIG. 2C, a bent portion 43 that is bent outward in the radial direction is provided at the lower end portion of the side plate 42 of the case 40 in the optical axis direction. The bent portion 43 is provided over the entire periphery of the lower end portion of the side plate 42 excluding the concave portion 42d in the optical axis direction. The bent portion 43 includes a protruding portion 43 a that protrudes outward in the radial direction from the side plate 42, and a curved surface portion 43 b that connects the protruding portion 43 a and the side plate 42.

As shown in FIG. 3, the case 40 is processed in the order of a drawing process (see FIG. 3B), an opening forming process (see FIG. 3C), and a separation process (see FIG. 3D). ing.
Specifically, as shown in FIG. 3B, a shape corresponding to the top plate 41 and the side plate 42 is formed from a single metal plate M in FIG. Yes. Here, projections P11 for forming the radial recesses 42c are provided on two sides of the drawing punch P10. Thereby, the magnetic plate storage portion is formed simultaneously with the drawing step. Next, as shown in FIG. 3C, through holes corresponding to the central opening 41a and the opening 41b are respectively formed by punching a mold. Finally, as shown in FIG. 3D, the molded product is separated from the metal plate by the cutting tool P20 for separating the mold. Further, as shown in FIG. 3 (e), a bent portion 43 is provided at the lower end portion in the optical axis direction of the side plate 42 of the case 40 which is a molded product separated from the metal plate.

Next, the positional relationship between the case 40 and the magnetic plates 70 and 71 will be described with reference to FIG.
As shown in FIG. 4, the magnetic plates 70 and 71 are respectively disposed in the radial recesses 42 c of the case 40. Specifically, the magnetic plates 70 and 71 are fixed to the radial recess 42c with an adhesive in a state where the magnetic plates 70 and 71 are in contact with one of the radial recesses 42c in the circumferential direction. In a state where the magnetic plates 70 and 71 are fixed to the radial recess 42c, the inner surface 42b of the side plate 42 and the inner surfaces 70a and 71a of the magnetic plates 70 and 71 are flush with each other. That is, the radial positions of the inner surface 42b of the side plate 42 and the inner surfaces 70a and 71a of the magnetic plates 70 and 71 are substantially equal to each other. As described above, the radial recess 42c serves as a magnetic plate storage portion for storing the magnetic plates 70 and 71.

  By the way, as a structure for housing the magnetic plate in the case, as shown in FIG. 12A, the side plate 42A of the case 40A is provided with a cutout portion 42A1 that penetrates the side plate 42A in the radial direction, and the cutout portion 42A1 includes the cutout portion 42A1. A structure for accommodating the magnetic plates 70A and 71A is conceivable. In this configuration, since the notch 42A1 is formed, the strength of the case 40A is reduced compared to a configuration in which the notch is omitted from the case 40A. As a result, the side plate 42A may be deformed, and the magnetic plates 70A and 71A may be attached in an inclined state along with the deformation. In addition, in order to house the magnetic plates 70A and 71A in the cutout portion 42A1, the circumferential width H6 of the cutout portion 42A1 must be larger than the circumferential width H5 of the magnetic plates 70A and 71A (see FIG. 12 (b), (c)). In particular, when the case 40 is formed by press working, the cutout portion 42A1 cannot be formed with high accuracy. Therefore, in order to arrange the magnetic plates 70A and 71A at preset positions, the width H6 in the circumferential direction of the notch 42A1 must be set to a size that takes into account a molding error due to press working. As a result, the width H6 of the notch 42A1 must be increased with respect to the width H5 of the magnetic plates 70A and 71A. Accordingly, there is a possibility that radio wave noise of the coil 60 leaks outside the case 40A from the gap formed between the cutout portion 42A1 and the magnetic plates 70A and 71A in the circumferential direction.

  In that respect, in this embodiment, since the radial recess 42c does not penetrate the side plate 42 in the radial direction, the above-described case strength reduction and the radio wave noise of the coil 60 leak from the case to the outside. Each will come to restrain.

  In addition to the structure having the above-described notch, the structure in which the magnetic plate is accommodated in the case is shown in FIG. 13 in which the outer surface 42B1 and the inner surface 42B2 of the side plate 42B are arranged in the radial direction on the side plate 42B of the case 40B. A structure is conceivable in which a concave radial recess 42B3 that protrudes outward is provided, and the magnetic plates 70B and 71B are accommodated in the radial recess 42B3. According to this configuration, since the cutout portion is not provided in the case 40B, it is possible to suppress a reduction in the strength of the case due to the cutout portion and leakage of radio noise of the coil 60 to the outside of the case. It becomes like this. However, since the outer surface 42B1 of the side plate 42B protrudes outward in the radial direction in order to form the radial recess 42B3, it is difficult to reduce the size of the case 40B in the radial direction.

  In this respect, in the present embodiment, only the inner surface 42b of the side plate 42 provided with the radial recess 42c is concave, and the outer surface 42a of the side plate 42 is flush with each other. Will be able to.

Next, the structure of the base 30 will be described with reference to FIG. The base 30 of this embodiment is configured as a single member by injection molding a resin material.
As shown to Fig.5 (a), the support | pillar part 32 is provided with the upper connection part 33 and the lower connection part 34 which each connect the support | pillar part 32 adjacent to the circumferential direction. The upper connecting portion 33 connects the upper ends of the support column portions 32 in the optical axis direction. The lower connecting portion 34 connects the lower ends of the column portions 32 in the optical axis direction. The lower connecting portion 34 is provided radially inward from the side surface 31 b of the base portion 31 and is provided so as to protrude upward in the optical axis direction from the base portion 31.

  An upper protruding portion 35 (in FIG. 5) protrudes inward in the radial direction from the upper end in the optical axis direction of the other supporting column 32 at the upper end in the optical axis direction of one supporting column 32a among the four supporting columns 32. (Hatched area). The upper projecting portion 35 is connected to each of the support column portion 32 and the upper connecting portion 33. The upper projecting portion 35 is provided with a column-side shaft receiving portion 36 that receives the shaft 50 (see FIG. 1).

  A base side shaft receiving portion 37 that receives the shaft 50 is provided at a position corresponding to the column side shaft receiving portion 36 and the radial direction and the circumferential direction in the base portion 31. Therefore, the shaft 50 is received at two positions in the optical axis direction by the column-side shaft receiving portion 36 and the base-side shaft receiving portion 37. Further, a base side shaft receiving portion 38 is provided where the shaft 51 (see FIG. 1) in the base portion 31 is disposed. The shaft 51 is received only by the base side shaft receiving portion 38.

In addition, a protrusion 32c that protrudes upward in the optical axis direction from the upper end surface 32b of the support column 32 in the optical axis direction is provided at the upper end of each support column 32 in the optical axis direction.
At the upper end in the optical axis direction of two sides of the side surface 31b of the base portion 31, a concave portion 31d that is recessed inward in the radial direction from the side surface 31b is provided. The recess 31d is opened upward in the optical axis direction.

  As shown in FIG. 5B, on the two sides of the side surface 31 b of the base portion 31, mounting portions 31 e for mounting the magnetic plates 70 and 71 are provided. The placement portion 31e is provided so as to protrude above the upper surface of the base portion 31 in the optical axis direction.

  On both sides in the circumferential direction of the mounting portion 31e on one side of the side surface 31b of the base portion 31, recessed portions 31f that are recessed from the side surface 31b in the radial direction are respectively provided. The recess 31f is opened upward in the optical axis direction in the same manner as the recess 31d.

  On both sides in the circumferential direction of the mounting portion 31e on one side of the side surface 31b of the base portion 31, storage portions 31g for storing the terminal portions of the lens driving device 1 (see FIG. 1) are respectively provided. . Between the circumferential direction of this accommodating part 31g and the mounting part 31e, the recessed part 31h dented toward the radial direction from the side surface 31b is each provided. The recess 31h is open upward in the optical axis direction, like the recesses 31d and 31f.

Next, with reference to FIG.6 and FIG.7, the structure of the state which attached the case 40 to the base 30 is demonstrated.
The case 40 is fitted to the base 30 in a state where the magnetic plates 70 and 71 are previously attached to the radial recess 42c, and is fixed to each other by an adhesive. Specifically, the protrusions 32 c of the support columns 32 are inserted into the openings 41 b of the top plate 41. In this state, the side plate 42 surrounds the column portion 32 and the coil 60 from the outside in the radial direction, and the lower end portion of the side plate 42 in the optical axis direction is in contact with the outer peripheral edge of the base portion 31 substantially correspondingly. Then, the base 30 and the case 40 are bonded and fixed to each other by filling an adhesive between the opening 41b and the protrusion 32c and between the base 31 and the side plate 42, respectively.

  As shown in FIG. 6A, the side plate 42 of the case 40 and the side surface 31b of the base 31 are formed flush with each other. An outer adhesive reservoir 80 is provided between the lower end of the side plate 42 in the optical axis direction and the recess 31d of the base 31 in the optical axis direction. The outer adhesive reservoir 80 is formed as a concave space that is recessed inward in the radial direction from the side plate 42 and the side surface 31b. Further, as shown in FIG. 6B, the circumferential length H1 of the outer adhesive reservoir 80 is substantially equal to the circumferential length H2 of the side plate 42.

  As shown in FIG. 6C, the bent portion 43 of the side plate 42 is in contact with the base portion 31 (hereinafter referred to as “contact surface A”). An inward adhesive reservoir portion 81 is provided between the curved surface portion 43 b of the bent portion 43 and the base portion 31 in the radial direction from the contact surface A. This inward adhesive reservoir 81 is formed as a space in which the gap between the optical axis directions increases as it goes inward in the radial direction. Further, the above-described outer adhesive reservoir 80 is provided by the protruding portion 43a of the bent portion 43 and the concave portion 31d of the base portion 31 outward in the radial direction from the contact surface A.

  The outer adhesive reservoir 80 is filled with the adhesive after the case 40 is attached to the base 30. Then, the adhesive filled in the outer adhesive reservoir 80 penetrates into the inner adhesive reservoir 81 through the contact surface A. As a result, the inner adhesive reservoir 81 is filled with the adhesive.

  As described above, by filling the outer adhesive reservoir 80 and the inner adhesive reservoir 81 with the adhesive, the side plate 42 (bending portion 43) and the base 31 are joined to each other. In addition, the side plate 42 is compared with the side plate and base structure in which the outer adhesive reservoir 80 and the inner adhesive reservoir 81 are omitted by the outer adhesive reservoir 80 and the inner adhesive reservoir 81. The adhesion area between the (bent portion 43) and the base portion 31 is increased.

  Further, the lower connecting portion 34 of the base portion 31 is formed above the inner adhesive reservoir portion 81 in the optical axis direction. As a result, the adhesive in the inner adhesive reservoir portion 81 is prevented from entering inward in the radial direction from the lower connecting portion 34.

  As shown in FIG. 7A, the case 40 and the base 30 are attached such that the optical axis direction concave portion 42d of the case 40 and the mounting portion 31e of the base 30 are fitted to each other. With this configuration, the circumferential mounting direction of the case 40 with respect to the base 30 is determined.

  In particular, in this embodiment, the case 40 is attached to the base 30 in a state where the magnetic plates 70 and 71 are attached to the radial recess 42c. Therefore, if the side plate 42 provided with the radial recess 42c to which the magnetic plates 70 and 71 are attached and the mounting portion 31e of the base portion 31 do not coincide with each other, the base portion 31 and the magnetic plates 70 and 71 interfere with each other. May end up. As a result, the lens driving device 1 is assembled while the magnetic plates 70 and 71 are deformed and the magnetic plates 70 and 71 are attached in the wrong mounting direction, and the side plate 42 has the diameter of each of the magnetic plates 70 and 71. There is a case where a problem that the pressing state remains inward in the direction may occur.

  In that respect, by using a configuration in which the mounting direction of the side plate 42 with respect to the base portion 31 is determined by fitting the optical axis direction concave portion 42d to the mounting portion 31e of the present embodiment, the optical axis direction concave portion is provided in the mounting portion 31e. If 42d does not fit, the case 40 cannot be attached to the base 30. Accordingly, when the case 40 is not attached to the base 30, the operator can recognize that the attachment direction is incorrect. Therefore, the lens is attached with the case attached to the base in the wrong direction. Assembling of the drive device 1 is suppressed. Accordingly, deformation of the magnetic plates 70 and 71 due to interference between the base 31 and the magnetic plates 70 and 71 is suppressed.

  An outer adhesive reservoir 82 is provided between the lower end portion in the optical axis direction of the side plate 42 on the side where the terminal 39 is not disposed and the optical axis direction between the base portion 31. The outer adhesive reservoir 82 is formed as a concave space that is recessed inward in the radial direction between the side plate 42 and the placement portion 31e and the recess 31f in the optical axis direction. Further, as shown in FIG. 7B, the circumferential length H3 of the outer adhesive reservoir portion 82 is provided to be approximately equal to the circumferential length H2 of the flat portion 421 of the side plate 42. ing.

  Further, an inward adhesive reservoir (not shown) is provided between the curved surface portion 43b of the bent portion 43 of the side plate 42 and the concave portion 31f of the base portion 31 in the optical axis direction. Similar to the inner adhesive reservoir 81 (see FIG. 6C), the inner adhesive reservoir is formed as a space in which the gap between the optical axes increases toward the inner side in the radial direction. ing.

  The outer adhesive reservoir 82 is filled with the adhesive after the case 40 is attached to the base 30. Then, the adhesive filled in the outer adhesive reservoir 82 penetrates into the inner adhesive reservoir through the contact surface between the protruding portion 43 a of the bent portion 43 and the base 31. As a result, the adhesive is filled in the inner adhesive reservoir. Further, by filling the space formed between the placement portion 31e and the optical axis direction concave portion 42d in the outer adhesive reservoir portion 82 with the adhesive, the magnetic plate 70 (see FIG. 1) and the base portion are filled. 31 and the optical axis direction recess 42d are bonded to each other.

  On the other hand, an outer adhesive reservoir 83 is provided between the lower end portion in the optical axis direction of the side plate 42 on the side where the terminal 39 is disposed and the optical axis direction between the base portion 31. The outer adhesive reservoir 83 is formed as a concave space that is recessed inward in the radial direction between the side plate 42, the placement portion 31e, the recess 31h, and the storage portion 31g in the optical axis direction. Further, as shown in FIG. 7C, the circumferential length H4 of the outer adhesive reservoir 83 is provided to be approximately equal to the circumferential length H2 of the flat portion 421 of the side plate 42. ing.

  Next, as shown in FIG. 8A, the side plate 42 of the case 40 surrounds the upper connecting portion 33 and the lower connecting portion 34 of the base 30 and is fitted to the upper connecting portion 33 and the lower connecting portion 34. is doing.

The coil 60 is formed between the upper connecting portion 33 and the lower connecting portion 34 in the optical axis direction.
The radial positions of the upper connecting portion 33 and the lower connecting portion 34 are provided so as to be located on the outer side in the radial direction with respect to the outermost position in the radial direction of the coil 60. As a result, the radial position of the side plate 42 is positioned more outward in the radial direction than the radial position of the coil 60. When the side plate 42 is moved inward in the radial direction due to an assembly error or the like, it contacts both the upper connecting portion 33 and the lower connecting portion 34 before contacting the coil 60. Contact is suppressed. As described above, the upper connecting portion 33 and the lower connecting portion 34 serve as a contact avoiding portion that avoids contact between the side plate 42 of the case 40 and the coil 60.

  As shown in FIG. 8B, the magnetic plate 70 is disposed radially outward from the upper connecting portion 33 and the lower connecting portion 34. As a result, the radial position of the magnetic plate 70 is positioned more radially outward than the outermost position of the coil 60 in the radial direction. When the magnetic plate 70 is moved inward in the radial direction due to an assembly error or the like, the magnetic plate 70 and the coil 60 are in contact with both the upper connecting portion 33 and the lower connecting portion 34 before contacting the coil 60. The contact with is suppressed. The above-described configuration is the same for the magnetic plate 71.

  Next, the structure of the holder 10 and the relationship between the holder 10 and the magnetic plates 70 and 71 will be described with reference to FIG. Further, in the moving body 1A of FIG. 9, the lens holder RH of the moving body 1A is omitted. The holder 10 of this embodiment is configured by injection molding using a resin material.

  As shown in FIG. 9, a holding portion 12 for holding each magnet 20 is provided at a position where the magnet 20 of the holder 10 is disposed. The holding portion 12 is provided as a concave shape that opens upward in the optical axis direction and is recessed inward in the radial direction from the side surface of the holder 10.

Between the magnets 20 adjacent to each other in the circumferential direction in the holder 10, insertion portions 13 and 14 that allow the shafts 50 and 51 to be inserted are respectively provided.
The insertion portion 13 penetrates the holder 10 in the optical axis direction and is provided as a circular through hole in a plan view in the optical axis direction. An inner diameter R1 of the insertion portion 13 is provided so as to be substantially the same as the outer diameter of the shaft 50.

  The insertion portion 14 penetrates the holder 10 in the optical axis direction and is provided as a long hole-shaped through hole in a plan view in the optical axis direction. The insertion part 14 is formed with a direction along the diagonal L2 connecting the centers of the insertion part 13 and the insertion part 14 as a major axis R2, and a direction orthogonal to the diagonal L2 as a minor axis R3. Further, the insertion portion 14 is provided such that the short diameter R <b> 3 is substantially the same as the outer diameter of the shaft 51 and the long diameter R <b> 2 is larger than the outer diameter of the shaft 51. Thereby, a gap is formed between the inner peripheral surface corresponding to the major axis R <b> 2 of the insertion portion 14 and the outer peripheral surface of the shaft 51.

Next, the arrangement relationship between the moving body 1A and the magnetic plates 70 and 71 will be described.
Shafts 50 and 51 are inserted into the insertion portions 13 and 14 of the holder 10 of the moving body 1A, respectively. The magnetic plates 70 and 71 are arranged only on one side of the center line with the diagonal line L2 formed by the insertion portions 13 and 14 as the center line. These two magnetic plates 70 are respectively arranged at the central positions of the magnets 20 that are opposed to the respective magnetic plates 70 in the radial direction.

  Here, the direction of the attractive force F1 to the outside in the radial direction of the magnet 20 generated by the magnetic plate 70 and the magnet 20 facing the magnetic plate 70 in the radial direction, and the magnetic plate 71 and the magnetic plate 71 in the radial direction The direction of the attractive force F2 to the outside in the radial direction of the magnet 20 generated by the opposing magnet 20 is orthogonal to each other. The direction of the resultant force F3 of the attractive force F1 and the attractive force F2 works in a direction perpendicular to the diagonal line L2.

  Since the moving body 1A is pulled in the direction of the resultant force F3 by the resultant force F3, the inner peripheral surfaces constituting the insertion portions 13 and 14 and the shafts 50 and 51 are always kept in contact with each other. That is, the two magnets 20 and the magnetic plates 70 and 71 that are opposed to the magnets 20 in the radial direction make the movable body 1A (holder 10) perpendicular to the diagonal line L2 that is one direction in the radial direction. An urging means for urging is configured. By this urging means, the inner peripheral surface constituting the insertion portions 13 and 14 of the holder 10 and the shafts 50 and 51 are kept in pressure contact with each other. When the moving body 1A moves in the optical axis direction, the inner peripheral surface of the insertion portions 13 and 14 and the shafts 50 and 51 slide, whereby the moving body 1A is guided by the shafts 50 and 51. .

Next, the driving operation of the lens driving device 1 will be described with reference to FIG. A one-dot chain line in FIG. 10 indicates the optical axis direction.
In FIG. 10A, the moving body 1A is located at the home position. Specifically, the lower surface of the holder 10 of the moving body 1 </ b> A is in contact with the upper surface of the base portion 31 of the base 30. When the moving body 1A is located at the home position, no current is applied to the coil 60.

  When the current shown in FIG. 10A is applied to the coil 60, the moving body 1A moves to the position shown in FIG. Specifically, a magnetic field is generated around the coil 60. Then, a magnetic circuit is formed by the magnetic field and the magnet 20, and a force for moving the moving body 1A upward in the optical axis direction is generated. Then, the moving body 1A moves from the home position shown in FIG. 10A upward in the optical axis direction to the position shown in FIG. 10B.

  On the other hand, when a current in the direction opposite to the direction shown in FIG. 10A is applied to the coil 60, a magnetic circuit is formed by this magnetic field and the magnet 20, and the moving body 1A is moved downward in the optical axis direction. A moving force is generated. That is, the moving body 1A moves from the position shown in FIG. 10B toward the home position. Here, regarding the mark attached to the coil 60 in FIG. 10A, a black dot mark indicates a direction toward the drawing reference person, and a cross mark indicates a direction away from the drawing reference person. Indicates.

  As described above, the lens is moved to the on-focus position while moving the moving body 1A upward and downward in the optical axis direction. At this time, the moving body 1A slides with respect to the shafts 50 and 51 by the magnetic force generated between the magnetic plates 70 and 71 and the magnetic plates 70 and 71 and the magnets 20 facing in the radial direction. For this reason, even when the moving body 1A is moved in the vertical direction, it is less susceptible to the influence of gravity. Further, even if the current application to the coil 60 is interrupted after the lens is moved to the on-focus position, the moving body 1A is moved to the on-focus position by the magnetic force between the magnet 20 and the magnetic plates 70 and 71. Maintained.

Next, a configuration of a camera module when the lens driving device 1 of the present embodiment is mounted on a camera will be described with reference to FIG.
As shown in FIG. 11, the filter 2 and the image sensor 3 are disposed on the base 30 side of the lens driving device 1. That is, the filter 2 and the image sensor 3 are disposed below the base 30 in the optical axis direction. In the base 30, the Hall element 4 is disposed as a position detection element. Based on the signal from the Hall element 4, the position of the moving body 1A is detected.

  During the focus operation, a CPU (Central Processing Unit) 5 controls the driver 6 to move the moving body 1A upward from the home position to a preset position in the optical axis direction. At this time, a position detection signal from the Hall element 4 is input to the CPU 5. At the same time, the CPU 5 processes a signal input from the image sensor 3 to obtain a contrast value of the captured image. Then, the position of the moving body 1A having the best contrast value is acquired as the on-focus position.

  Thereafter, the CPU 5 drives the moving body 1A toward the on-focus position. At that time, the CPU 5 monitors the signal from the hall element 4 and drives the moving body 1A until the signal from the hall element 4 is in a state corresponding to the on-focus position. Thereby, the moving body 1A is positioned at the on-focus position.

According to the lens driving device 1 of the present embodiment, the following effects can be obtained.
(1) In this embodiment, the case 40 covers the coil 60 from the outside in the radial direction and is made of a metal material. Therefore, it is possible to suppress the radio noise generated by the coil 60 from leaking to the outside from the lens driving device 1.

  (2) In the present embodiment, the side plate 42 of the case 40 is provided with a radial recess 42c, and the magnetic plates 70 and 71 are accommodated in the radial recess 42c, respectively. Therefore, it is possible to suppress leakage of radio wave noise from the lens driving device 1 to the outside as compared with the configuration in which the side plate 42A is provided with the cutout portion 42A1 for storing the magnetic plates 70A and 71A shown in FIG. It becomes like this. Furthermore, compared with the said structure, the fall of the intensity | strength of case 40 can be suppressed now.

  (3) In the present embodiment, the outer surface 42a of the side plate 42 is formed flush with the inner surface 42b of the side plate 42, and a radial recess 42c is provided. Therefore, in order to accommodate the magnetic plates 70B and 71B shown in FIG. 13, both the outer surface 42B1 and the inner surface 42B2 of the side plate 42B are provided with radial recesses 42B3 protruding outward in the radial direction. The size in the radial direction can be reduced.

  (4) In this embodiment, case 40 is the structure shape | molded by pressing a metal plate. Therefore, it is possible to manufacture the case at a lower cost compared to molding the case by cutting the metal material and molding the case by casting the metal material. In particular, since the thickness of the top plate 41 and the side plate 42 can be reduced compared to the case of casting a metal material, the case 40 can be miniaturized in the optical axis direction and the radial direction. .

  (5) In this embodiment, the mounting part 31e is provided on two sides of the outer peripheral edge of the base 31, and the two sides of the side plate 42 are fitted to the mounting part 31e. An optical axis direction recess 42d that determines the mounting direction of the case 40 with respect to the base 30 is provided. Therefore, since the mounting direction of the side plate 42 with respect to the base 31 is determined by the mounting portion 31e and the optical axis direction concave portion 42d, it is possible to suppress the worker from attaching the case 40 to the base 30 in an incorrect direction. Will be able to. Thereby, it becomes possible to prevent the magnetic plates 70 and 71 from being deformed by attaching the base 30 to the case 40 in the wrong direction.

  (6) In this embodiment, since the upper connecting portion 33 and the lower connecting portion 34 of the base 30 are provided, the case 40 comes into contact with the upper connecting portion 33 and the lower connecting portion 34 before contacting the coil 60. The contact between the case 40 and the coil 60 is mechanically avoided. Therefore, it is possible to reliably suppress the short circuit of the coil due to the contact between the case 40 and the coil 60.

  In particular, by reducing the size of the lens driving device 1, even when the coil 60 and the case 40 are close to each other, contact between the coil 60 and the case 40 is avoided by the upper connecting portion 33 and the lower connecting portion 34. Therefore, the contact between the coil 60 and the case 40 due to the downsizing of the lens driving device 1 can be suppressed. Therefore, the short circuit of the coil resulting from this contact can be suppressed.

  (7) In the present embodiment, outer adhesive reservoirs 80, 82, and 83 are provided between the side plate 42 and the base 31. Therefore, since the side plate 42 and the base portion 31 are fixed by the adhesive, the bonding strength between the base 30 and the case 40 can be improved. In addition, since the adhesive area between the side plate 42 and the base portion 31 is increased by the outer adhesive reservoir portions 80, 82, and 83, the bonding strength between the side plate 42 and the base portion 31 can be improved.

  (8) In this embodiment, an inner adhesive reservoir 81 is further formed between the bent portion 43 and the base portion 31 of the side plate 42. Therefore, since the adhesion area between the side plate 42 and the base portion 31 is further increased, the bonding strength between the side plate 42 and the base portion 31 can be further improved.

  (9) In the present embodiment, the side plate 42 and the top plate 41 are configured as a single member. Therefore, it is possible to suppress leakage of radio noise generated by the coil 60 to the outside of the case 40 as compared with a case where the side plate and the top plate are configured as separate members.

  (10) In recent years, in addition to the reduction in thickness of mobile phones, with the increase in additional functions, the number of electronic components arranged in the mobile phone is increasing. Therefore, the space where each electronic component is arranged is reduced, and the space between the electronic components is reduced. As a result, the interior of the mobile phone is in an environment where radio noise generated by the electronic components easily affects other electronic components. In this respect, in the present embodiment, the case 40 of the lens driving device 1 is made of a metal material, thereby suppressing leakage of radio noise generated by the coil 60 to the outside of the lens driving device 1. Therefore, it is possible to suppress an adverse effect caused by the radio wave noise on the electronic components arranged near the lens driving device 1.

  (11) In this embodiment, the side plate 42 surrounds the entire circumference of the coil 60 from the radial direction. Therefore, compared with a configuration in which the side plate surrounds only a part of the coil 60 in the circumferential direction from the radial direction, the effect of suppressing leakage of radio wave noise generated by the coil 60 from the lens driving device 1 to the outside is further improved. It can be further improved.

  (12) In the present embodiment, the circumferential lengths H1, H3, and H4 of the outer adhesive reservoir portions 80 and 82 are provided substantially equal to the circumferential length H2 of the flat portion 421 of the side plate 42. Yes. Here, when the circumferential lengths H1, H3, and H4 of the outer adhesive reservoir portions 80 and 82 are shorter than the circumferential length H2 of the flat surface portion 421, the bonding strength between the side plate 42 and the base portion 31 is reduced. Resulting in. On the other hand, when the circumferential lengths H1, H3, H4 of the outer adhesive reservoir portions 80, 82 are longer than the circumferential length H2 of the flat surface portion 421, the connecting portion 422 is moved to a position corresponding to the circumferential direction. The side adhesive reservoir portions 80 and 82 are formed. However, since the connecting portion 422 has a curved shape, the connecting portion 422 is located radially inward from the outer adhesive reservoir portions 80 and 82. Therefore, the adhesive does not come into contact with the connecting portion 422. As a result, the outer adhesive reservoir portions 80 and 82 are filled with the adhesive up to a portion unnecessary for joining the side plate 42 and the base portion 31. In that respect, in this embodiment, since the circumferential lengths H1, H3, H4 of the outer adhesive reservoirs 80, 82 are substantially equal to the circumferential length H2 of the side plate 42, the side plate 42 and the base portion In addition, it is possible to suppress a decrease in the bonding strength with 31 and to suppress unnecessary filling of the adhesive.

(Other embodiments)
The specific configuration of the lens driving device of the present invention and the camera module including the lens driving device is not limited to the configuration exemplified in the above-described embodiment, and may be modified as follows, for example. Further, the following modified examples are not applied only to the above-described embodiment, and different modified examples can be implemented in combination with each other.

  In the lens driving device 1 of the above-described embodiment, the side plates 42 are provided with the radial recesses 42c as a configuration for storing the magnetic plates 70 and 71. However, the storage structure of the magnetic plates 70 and 71 is limited to this. There is nothing. For example, as shown in FIG. 12A, the side plate 42A of the case 40A can be provided with a notch 42A1 that penetrates in the radial direction, and the magnetic plates 70A and 71A can be accommodated in the notch 42A1. Thereby, there can exist an effect similar to the effect (1) of the said embodiment, and (10).

  In the lens driving device 1 of the above embodiment, the outer surface 42a of the side plate 42 of the case 40 is configured to be flush with each other, but the configuration of the outer surface 42a of the side plate 42 is not limited to this. For example, as shown in FIG. 13A, the radial recess 42B3 can be formed such that both the outer surface 42B1 and the inner surface 42B2 of the side plate 42B of the case 40B protrude outward in the radial direction. In this case, as shown in FIG. 13B, the magnetic plates 70B and 71B are accommodated in the radial recess 42B3, respectively. Thereby, the same effects as the effects (1), (2), (4), and (10) of the above embodiment can be obtained.

  -In the lens drive device 1 of the said embodiment, although the top plate 41 and the side plate 42 of the case 40 were comprised as a single member, the structure of the case 40 is not limited to this. The top plate 41 and the side plate 42 can also be configured using different members. In this case, it is desirable that both the top plate 41 and the side plate 42 are made of a metal material. Thereby, the effect similar to the effect (1)-(4) and (10) of the said embodiment can be show | played.

  -In the lens drive device 1 of the said embodiment, although the case 40 was shape | molded by pressing the metal plate M, the manufacturing method of the case 40 is not limited to this. For example, the case 40 can be formed by other processing methods such as casting and cutting. Thereby, there can exist an effect similar to the effect (1)-(3) and (10) of the said embodiment.

-In the lens drive device 1 of the said embodiment, although the side plate 42 was the structure which encloses from the outer side of radial direction over the perimeter of the circumferential direction of the coil 60, the side plate 42 is not limited to this. . For example, only a part in the circumferential direction of the coil 60 may be enclosed from the outside in the radial direction. According to this structure, the effect according to the effect (1) of this embodiment can be produced.
In the lens driving device 1 of the above embodiment, the outer adhesive reservoir 80 is formed as a concave space that is recessed inward in the radial direction by the lower end of the side plate 42 and the recess 31d of the base 31. The configuration of the direction adhesive reservoir 80 is not limited to this. For example, the outer adhesive may be formed by a configuration in which a concave portion that is recessed inward in the radial direction and opened downward in the optical axis direction is provided at the lower end portion in the optical axis direction of the side plate 42, and the concave portion 31 d is omitted from the base portion 31. The reservoir 80 can be configured. Further, the outer adhesive reservoir 80 can be constituted by the recess and the recess 31d provided at the lower end of the side plate 42 in the optical axis direction without omitting the recess 31d of the base 31. The same applies to the outer adhesive reservoir 82. Thereby, there can exist an effect similar to the effect (6) of the said embodiment.

  -In the lens drive device 1 of the said embodiment, although the magnet 20 and the coil 60 were arrange | positioned facing radial direction, the arrangement | positioning aspect of the magnet 20 and the coil 60 is not limited to this. For example, as in the conventional structure shown in FIG. 14, the magnet 160 is arranged between the coils 150 and 151 in the optical axis direction, that is, the magnet 160 and the coils 150 and 151 are arranged opposite to each other in the optical axis direction. It can also be set as an aspect.

  -In the lens drive device 1 of the said embodiment, although the metal material of case 40 was made non-magnetic, the metal material of case 40 is not limited to this. Case 40 can also be comprised from the metal material of a magnetic body. With this configuration, it is possible to suppress leakage of electromagnetic wave noise generated due to energization of the coil 60 in addition to the radio wave noise to the outside of the lens driving device 1.

In this case, it is desirable that the inner surfaces 70a and 71a of the magnetic plates 70 and 71 are positioned radially inward from the inner surface 42b of the side plate 42, respectively.
Further, instead of the arrangement configuration of the magnetic plates 70 and 71 and the side plate 42 described above, the magnetic plates 70 and 71 are made of a ferromagnetic material, and the side plate 42 is made of a metal material that is weaker than the magnetic plates 70 and 71. It can also be configured.

  DESCRIPTION OF SYMBOLS 1 ... Lens drive device, 1A ... Moving body, 1B ... Fixed body, 2 ... Filter, 3 ... Image sensor, 4 ... Hall element, 5 ... CPU, 6 ... Driver, 10 ... Holder, 11 ... Opening part, 12 ... Holding , 13 ... insertion part, 14 ... insertion part, 20 ... magnet, 30 ... base, 31 ... base part, 31a ... opening part, 31b ... side face, 31d ... concave part, 31e ... mounting part (positioning part), 31f ... concave part , 31 g... Storage section, 31 h... Recessed portion, 32... Support section, 32 a... Support section, 32 c... Projection section, 33 ... upper connection section (contact avoidance section), 34. Projection part, 36 ... column side shaft receiving part, 37 ... base side shaft receiving part, 38 ... base side shaft receiving part, 39 ... side face, 40, 40A, 40B ... case, 41 ... top plate, 41a ... central opening, 41b ... opening, 42, 42A, 42B Side plate, 42a, 42B1 ... outer surface, 42b, 42B2 ... inner surface, 42c, 42B3 ... radial recess (recess), 42d ... optical axis recess (positioning part), 42A1 ... notch, 421 ... flat part, 422 ... connecting part , 50, 51 ... shaft, 60 ... coil, 61 ... first coil, 62 ... second coil, 70, 71, 70A, 71A, 70B, 71B ... magnetic plate, 80 ... outer adhesive reservoir (adhesive reservoir) ), 81... Inner adhesive reservoir (adhesive reservoir), 82. Outer adhesive reservoir (adhesive reservoir), 83. Outer adhesive reservoir (adhesive reservoir), P 10. Diaphragm punch, P11 ... projection, P20 ... bite, RH ... lens holder.

Claims (10)

A base having an opening for exposing the lens and a support column extending from the base; a case attached to the base; a coil formed by winding a conductive wire around the support; and the base And an optical axis direction in which the holder is housed in an internal space formed by the case and holds the lens, and a magnet fixed to the holder, and the holder is a direction along the optical axis of the lens. In the lens driving device moving to
The case is made of a metal material,
The lens driving device according to claim 1, wherein the case is provided with a side plate that surrounds the coil from the outside in the radial direction of the lens. The lens driving device according to claim 1,
The lens driving device has a magnetic plate that is arranged outward in the radial direction from the coil, and that opposes the magnet and the radial direction,
The side plate is provided with a recess recessed outward in the radial direction,
In the recess, the magnetic plate is stored,
The lens driving device according to claim 1, wherein the side plate encloses the lens from the outer side in the radial direction over the entire circumference of the coil in a circumferential direction surrounding the lens from the radial direction. The lens driving device according to claim 2,
The radially outer surface of the side plate is formed flush with
The concave portion is provided as a concave shape in which the radially inner surface of the side plate in which the concave portion is provided is more radially outward than the radially inner surface of the other portion of the side plate. A lens driving device. In the lens drive device according to any one of claims 1 to 3,
The case is formed by press-working a metal plate. In the lens drive device according to any one of claims 1 to 4,
The base is formed in a substantially square shape in plan view,
An end portion attached to the base portion of the side plate is formed in a substantially square ring shape in plan view in the optical axis direction,
The lens driving device according to claim 1, wherein the base and the side plate are provided with positioning portions that determine a mounting direction in a circumferential direction of the side plate with respect to the base. In the lens drive device according to any one of claims 1 to 5,
The lens driving device according to claim 1, wherein the base is provided with a contact avoiding portion that avoids contact between the case and the coil by contacting the case outward in the radial direction with respect to the coil. In the lens drive device according to any one of claims 1 to 6,
The end portion on the other end side, which is the base side in the optical axis direction of the side plate, and the portion of the base portion facing the end portion and the optical axis direction are fixed to each other by an adhesive,
At least one of the end portion of the side plate and the portion of the base portion is provided with an adhesive reservoir for storing the adhesive. The lens driving device according to claim 7,
The end portion of the side plate is provided with a bent portion that bends outward in the radial direction of the lens,
A lens driving device, wherein an adhesive reservoir for storing the adhesive is provided between a radially inner portion of the bent portion and the portion of the base. In the lens drive device according to any one of claims 1 to 8,
The case has an opening for opening the lens and a top plate connected to the side plate,
The side plate and the top plate are configured as a single member.   A camera module comprising the lens driving device according to claim 1.

Images