Lens driving device, camera device, and electronic equipment

Abstract

The present invention provides a lens driving device, a camera device, and an electronic device capable of fully ensuring the output of a magnetic detection element. The lens driving device (5) comprises a base (80) formed by inserting metal parts (9a, 9b, 9c, 9d, 9e, and 9f), a carrier (50) for holding a lens body (59), a Hall IC (8) as a magnetic detection element mounted in the base (80), and a Hall magnet (6) as a magnetic detection magnet mounted in the carrier (50) opposite to the Hall IC (8). Thus, the base (80) has a first upright portion (1) erected from its bottom plate portion (82), the metal parts (9a, 9b, 9c, 9d, 9e, and 9f) are erected inside the first upright portion (1), and the Hall IC (8) is mounted on the first upright portion (1) and is electrically connected to the metal parts (9a, 9b, 9c, 9d, 9e, and 9f).

Description

Technical Field

[0001] The present invention relates to a lens driving device, a camera device, and an electronic device used in electronic devices such as smartphones. Background Art

[0002] Some camera devices equipped with an autofocus function use a magnetic sensor to detect changes in the relative positional relationship between the carrier holding the lens and the frame that houses it. Patent Document 1 is a document that discloses technology related to this type of camera device. The camera device disclosed in Patent Document 1 has a drive coil wound around the carrier and a built-in magnetic detection magnet. The drive magnet and the magnetic detection element are provided on the inner wall of the frame where the drive coils face each other. In this camera device, the magnetic detection element detects the position of the carrier in the direction of the optical axis based on the changes in the magnetic field generated by the magnetic detection magnet as the carrier moves in the direction of the optical axis.

[0003]

Prior art literature

[0004] [Patent Literature]

[0005] [Patent Document 1] U.S. Patent Publication No. 2018 / 0196217A1 Summary of the Invention

[0006] [Problems to be solved by the invention]

[0007] However, the lenses used in these camera devices are becoming increasingly larger. To ensure sufficient driving force to operate the heavier lenses, camera devices equipped with large lenses tend to increase the number of turns of the drive coil wound around the carrier. This results in an increase in the radial thickness of the drive coil, which increases the distance between the magnetic detection magnet and the magnetic detection element, making it difficult to ensure sufficient output from the magnetic detection element.

[0008] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a lens driving device capable of sufficiently ensuring the output of a magnetic detection element.

[0009]

Methods for solving the problem

[0010] In order to solve the above-mentioned problems, the lens driving device as a preferred embodiment of the present invention is characterized in that it comprises: a base formed by inserting a metal part; a carrier for holding the lens body; a magnetic detection element mounted on the base; and a magnet for magnetic detection mounted on the carrier and opposite to the magnetic detection element, the base having a standing portion erected from its bottom plate portion, the metal part standing upright inside the standing portion, the magnetic detection element being installed on the standing portion and being conductive with the metal part.

[0011] In this embodiment, a coil may be wound on a side surface of the carrier, the magnet for magnetic detection may be arranged inside the coil, and the magnetic detection element may be arranged inside the magnet for magnetic detection.

[0012] Furthermore, the bottom plate portion may be provided with a through hole, and the upright portion may be provided at an edge portion of the through hole.

[0013] Alternatively, the metal member may include a horizontal portion embedded in the bottom plate, one end of the metal member may protrude into the upright portion as a rising portion, and the other end of the metal member may protrude forward or backward from the bottom plate as a terminal.

[0014] Furthermore, the bottom plate portion may be provided with a hole so that the horizontal portion and the rising portion can be seen through the hole from the rear side of the bottom plate portion.

[0015] Alternatively, the base other than the upright portion including the horizontal portion and the terminal and the upright portion having the standing portion may be provided, the upright portion may be adhesively fixed to the base other than the upright portion, and the horizontal portion and the standing portion may be electrically joined at the hole.

[0016] A camera device according to another embodiment of the present invention is characterized by including the above-mentioned lens driving device.

[0017] An electronic device according to another embodiment of the present invention includes the camera device described above.

[0018] Effects of the invention

[0019] The lens driving device of the present invention comprises a base formed by inserting a metal component, a carrier for holding a lens body, a magnetic detection element mounted on the base, and a magnet for magnetic detection mounted on the carrier and facing the magnetic detection element. The base has a standing portion erected from its bottom plate portion, the metal component stands upright inside the standing portion, and the magnetic detection element is mounted on the standing portion and is connected to the metal component. Therefore, regardless of the thickness of the coil in the radial direction, a lens driving device that fully ensures the output of the magnetic detection element can be provided. Therefore, the degree of freedom of coil design can be increased. In addition, an FPC used to electrically connect the magnetic detection element is no longer required, and the manufacturing process can be shortened. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view of a smartphone 100 equipped with a camera device 3 including a lens driving device 5 as one embodiment of the present invention.

[0021] Figure 2 yes Figure 1A three-dimensional diagram of the lens driving device 5.

[0022] Figure 3 Observing from other directions Figure 2 Stereoscopic image.

[0023] Figure 4 It is decomposition Figure 2 as well as Figure 3 A three-dimensional diagram of the lens driving device 5.

[0024] Figure 5 It is from Figure 2 A perspective view of the lens driving device 5 with the housing 10 removed.

[0025] Figure 6 Observing from other directions Figure 5 Stereoscopic image.

[0026] Figure 7 It is cut along a pair of diagonal lines Figure 2 as well as Figure 3 A partial cross-sectional view of the lens driving device 5.

[0027] Figure 8 Yes Figure 2 as well as Figure 3 A perspective view showing the positional relationship between the bottom plate portion 82 of the base 80, the first upright portion 1, the second upright portion 2, and the metal parts 9a, 9b, 9c, 9d, 9e, 9f and the Hall IC 8 and the Hall magnet 6 in the lens driving device 5.

[0028] Figure 9 Observing from other directions Figure 8 perspective drawing.

[0029] Figure 10 Observed from the rear Figure 2 as well as Figure 3 A three-dimensional view of the bottom plate portion 82 of the base 80 and the first upright portion 1.

[0030] Figure 11 Yes Figure 10 A perspective view showing the positional relationship between the bottom plate portion 82 of the base 80, the first upright portion 1, and the metal components 9a, 9b, 9c, 9d, 9e, 9f, the Hall IC 8, and the Hall magnet 6.

[0031] [Description of Reference Numerals]

[0032] 1. First upright portion; 2. Second upright portion; 3. Camera unit; 4. Rear spring; 5. Lens drive unit; 6. Hall magnet; 8. Hall IC; 9a, 9b, 9c, 9d, 9e, 9f. Metal parts; 10. Housing; 11. Through-holes 51, 81; 12. Top plate; 13. Side plate; 20. Front spring; 21. Inner portion 71; 22. Outer portion 72; 23. Wrist; 30. Frame; 33. Support plate; 40. Drive magnet; 50. Carrier; 54. 58 slot; 56 coil winding portion; 59 lens body; 60 coil; 70 rear spring; 80 base; 82 bottom plate portion; 83 column portion; 88 hole; 89 image sensor; 90a, 90b, 90c, 90d, 90e, 90f terminals; 91a, 91b, 91c, 91d, 91e, 91f rising portions; 92a, 92b, 92c, 92d, 92e, 92f horizontal portions; 100 smartphone; 101 middle plate; 102 side plate. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, the camera device 3 including the lens driving device 5 according to one embodiment of the present invention is housed in the housing of the smartphone 100 .

[0034] The camera device 3 includes a lens 59, an image sensor 89 that converts light incident through the lens 59 into an image signal, and a lens driving device 5. The lens driving device 5 has a structure for holding the lens 59 and the image sensor 89 and drives the lens 59.

[0035] Hereinafter, the optical axis direction of the lens body 59 will be referred to as the Z direction, the direction perpendicular to the Z direction will be referred to as the X direction, and the direction perpendicular to both the Z and X directions will be referred to as the Y direction. Furthermore, when viewed from the lens body 59, the side of the object being recorded will sometimes be referred to as the front side, and the opposite side (the side facing the image sensor 89) will sometimes be referred to as the rear side. The front side corresponds to the +Z side, and the rear side corresponds to the -Z side.

[0036] like Figure 4 As shown, the lens driving device 5 houses a carrier 50 , a coil 60 , a front spring 20 , a rear spring 70 , four driving magnets 40 , a Hall magnet 6 , and a Hall IC 8 in a housing formed by combining a base 80 and a housing 10 .

[0037] The housing 10 is a quadrilateral having a top plate 12 with a through hole 11 formed in the center and four side plates 13 extending from four sides of the top plate 12 along the -Z side.

[0038] The base 80 is quadrilateral and has a bottom plate 82 with a through hole 81 in the center, four pillars 83 erected at the four corners of the bottom plate 82 , and a first erect portion 1 and a second erect portion 2 erected around the through hole 81 of the bottom plate 82 .

[0039] like Figure 2 、 Figure 3 、 Figure 8 as well as Figure 9 As shown, the first upright portion 1 and the second upright portion 2 of the base 80 are located across the through hole 81 and face a diagonal line of the bottom plate 82. The first upright portion 1 includes a center plate 101 and two side plates 102 protruding from both ends of the center plate 101 toward the side opposite to the through hole 81.

[0040] Parts of six metal components 9a, 9b, 9c, 9d, 9e, and 9f are embedded in the bottom plate 82. Each of the metal components 9a, 9b, 9c, 9d, 9e, and 9f has horizontal portions 92a, 92b, 92c, 92d, 92e, and 92f embedded in the bottom plate 82. One end of each metal component serves as rising portions 91a, 91b, 91c, 91d, 91e, and 91f, protruding into the first upright portion 1. The other end of each metal component serves as terminals 90a, 90b, 90c, 90d, 90e, and 90f, protruding from the base 80.

[0041] The base ends of the standing portions 91a, 91b, 91c, 91d, 91e and 91f are arranged in parallel at approximately equal intervals in the first standing portion 1. Figure 10 、 Figure 11 As shown, six holes 88 are provided on the bottom plate portion 82 so that the ends of the horizontal portions 92a, 92b, 92c, 92d, 92e and 92f and the base ends of the standing portions 91a, 91b, 91c, 91d, 91e and 91f can be seen through the holes 88 from the rear side of the bottom plate portion 82.

[0042] like Figure 11 As shown, rising portions 91a and 91b extend forward slightly forward of rising portions 91c and 91d, respectively, and curve toward the sides of rising portions 91c and 91d. The front end of rising portion 91a is located forward of the front end of rising portion 91d, and the front end of rising portion 91b is located forward of the front end of rising portion 91c. Standing portion 91f extends forward slightly forward of rising portion 91e, and curves toward the side of rising portion 91e. The front end of rising portion 91f is located forward of the front end of rising portion 91e. At least the front ends of rising portions 91a, 91b, 91c, 91d, 91e, and 91f are exposed radially outward of first rising portion 1.

[0043] like Figure 7 , Figure 8 ,as well as Figure 9As shown, Hall effect IC 8, a magnetic detection element, is mounted at the exposed tips of the rising portions 91a, 91b, 91c, 91d, 91e, and 91f of the first upright portion 1. The tips of the rising portions 91a, 91b, 91c, 91d, 91e, and 91f are connected to the signal input and output contacts of Hall effect IC 8. Hall effect IC 8 is electrically conductive to the rising portions 91a, 91b, 91c, 91d, 91e, and 91f.

[0044] Terminals 90a, 90b, 90c, 90d, 90e, and 90f are bent at the other ends of horizontal portions 92a, 92b, 92c, 92d, 92e, and 92f. Terminals 90a, 90b, 90c, and 90d protrude toward the -Z side from the +Y side edge of bottom plate 82. Terminals 90e and 90f protrude toward the +Z side from respective positions near two posts 83 on the -X side of the front surface of bottom plate 82.

[0045] Here, the base 80, which integrates the metal components 9a, 9b, 9c, 9d, 9e, and 9f, is produced in the following order. The base 80, excluding the first upright portion 1, is formed by insert molding using the portions of the metal components 9a, 9b, 9c, 9d, 9e, and 9f other than the rising portions 91a, 91b, 91c, 91d, 91e, and 91f as the first embedded metal. The first upright portion 1 is formed by insert molding using the portions of the rising portions 91a, 91b, 91c, 91d, 91e, and 91f as the second embedded metal. Next, the base 80, excluding the first upright portion 1, is bonded and secured to the first upright portion 1. Then, the ends of the horizontal portions 92a, 92b, 92c, 92d, 92e, and 92f exposed through the hole 88 of the bottom plate portion 82 and the rear ends of the rising portions 91a, 91b, 91c, 91d, 91e, and 91f are electrically joined by welding using electrodes inserted from the rear side of the hole 88. The electrical joining can be accomplished using soldering or a conductive adhesive.

[0046] like Figure 4 As shown, the carrier 50 has an octagonal shape when viewed in the Z direction. A through-hole 51 is provided at the center of the carrier 50 for holding the lens 59. Coil winding portions 56 and wound coils 60 are located in the Z-direction center of the eight side surfaces of the carrier 50. The front end of the carrier 50 is formed in a circular annular shape protruding forward. The rear end of the carrier 50 is formed in a circular annular shape protruding rearward.

[0047] Two grooves 54 are recessed outward at mutually opposing positions on the inner surface of the through hole 51. The first upright portion 1 and the second upright portion 2 of the base 80 are accommodated in the two grooves 54. In this case, the radial inner positions of the first upright portion 1 and the second upright portion 2 are always positioned outward relative to the radial inner position of the through hole 51. Figure 7 As shown, a groove 58 is recessed forward on the rear end surface of the carrier 50. Groove 58 houses a Hall magnet 6, which serves as a magnetic detection magnet. The Hall magnet 6 is positioned opposite the Hall IC 8. The Hall IC 8 detects the magnetic field from the Hall magnet 6 to detect the position of the Hall magnet 6, and thus the position of the carrier 50 and / or the lens 59.

[0048] like Figure 4 As shown, the frame 30 is a square ring. Support pieces 33 protrude rearward at the four corners of the frame 30. The front spring 20 comprises an inner portion 21, an outer portion 22, and an arm portion 23 sandwiched between them. The rear spring 70 is divided into a first electrical connection portion and a second electrical connection portion, each comprising an inner portion 71, an outer portion 72, and an arm portion 73 sandwiched between them. Forked clamping portions corresponding to the pillars 83 are provided at the four corners of the outer portion 72.

[0049] The outer portion 22 of the front spring 20 is mounted and fixed to the frame 30. The front spring 20 and the frame 30 are integrated, but are fixed to the rear surface of the top plate 12 of the housing 10. The inner portion 21 of the front spring 20 is fixed to the peripheral edge of the through hole 51 on the front surface of the carrier 50. The outer portion 72 of the rear spring 70 is fixed to the front surface of the bottom plate 82.

[0050] The driving magnet 40 is fixed to the inner surface of the side plate portion 13 of the housing 10. Figure 5 、 Figure 6 As shown, the driving magnet 40 is positioned by the frame 30. The lower end of the side plate 13 of the housing 10 is fixed to the peripheral edge of the front surface of the bottom plate 82. The driving magnet 40 on the inner surface of the side plate 13 of the housing 10 is parallel to and faces the coil 60 with a slight gap therebetween, with the same magnetic pole facing the coil 60. The driving magnet 40 and the coil 60 generate a driving force for the carrier 50, which serves as the movable part.

[0051] like Figure 2 As shown, terminals 90a, 90b, 90c, and 90d on the +Y side of the bottom plate 82 of the base 80 are exposed toward the rear. The substrate on which the image sensor 89 is mounted is secured from the rear to the bottom plate 82 of the base 80. Terminals 90a, 90b, 90c, and 90d are electrically connected to the substrate. This forms a circuit: substrate → metal component 9a → Hall IC 8 → metal component 9d → substrate, and another circuit: substrate → metal component 9b → Hall IC 8 → metal component 9c → substrate.

[0052] Furthermore, terminals 90e and 90f are exposed on the front side of the bottom plate 82 and are electrically connected to the outer sides 72 of the first and second electrical connectors of the rear spring 70. The inner sides 71 of the first and second electrical connectors are electrically connected to one end and the other end of the coil 60. This forms a current path: Hall IC 8 → metal component 9e → first electrical connector of the rear spring 70 → coil 60 → second electrical connector of the rear spring 70 → metal component 9f → Hall IC 8.

[0053] like Figure 7 As shown, on the diagonal lines of the rectangular base 80, a Hall magnet 6 is arranged inside the coil 60, and a Hall IC 8 is arranged inside the Hall magnet 6. The Hall magnet 6 and the Hall IC 8 face each other with a slight gap. When current is supplied to the coil 60 from the Hall IC 8, the electromagnetic interaction between the coil 60 and the driving magnet 40 causes the carrier 50 to move in the Z direction along with the lens 59. The Hall IC 8 detects the position of the carrier 50 based on the changes in the magnetic field generated by the Hall magnet 6 as the carrier 50 moves, and controls the amount of current supplied to the coil 60 based on this position.

[0054] The above describes the structural details of this embodiment. The lens drive device 5 of this embodiment includes a base 80 formed by inserting metal components 9a, 9b, 9c, 9d, 9e, and 9f; a carrier 50 for holding a lens body 59; a Hall effect IC 8 serving as a magnetic detection element mounted on the base 80; and a Hall effect magnet 6 serving as a magnetic detection magnet mounted on the carrier 50 and facing the Hall effect IC 8. The base 80 thus includes a first upright portion 1 extending from its bottom plate 82. The metal components 9a, 9b, 9c, 9d, 9e, and 9f stand upright within the first upright portion 1. The Hall effect IC 8 is mounted on the first upright portion 1 and is electrically conductive to the metal components 9a, 9b, 9c, 9d, 9e, and 9f. This eliminates the need for a coil 60 between them, reducing the gap between the Hall effect IC 8 and the Hall effect magnet 6. Consequently, a lens drive device can be provided that sufficiently ensures the output of the Hall effect IC 8, regardless of the radial thickness of the coil 60. This increases the degree of design freedom for the coil 60. Furthermore, an FPC for electrically connecting the Hall IC 8 is unnecessary, and the manufacturing process can be shortened.

[0055] Furthermore, the lens driving device 5 of this embodiment has the Hall magnet 6 disposed inside the coil 60 on one diagonal line of the bottom plate 82, and the Hall IC 8 disposed inside the Hall magnet 6. Therefore, the Hall IC 8 need not be disposed in the thinner portion of the center inner portion of the four sides of the bottom plate 82, allowing four magnets 40 to be disposed on all four sides. Consequently, compared to the prior art in which two driving magnets 40 are disposed on two opposing sides, a lens driving device 5 with greater driving force can be provided.

[0056] Furthermore, in the above embodiment, the number of metal members 9a, 9b, 9c, 9d, 9e, and 9f may be more than or less than six, as long as the necessary number is sufficient. For example, they may be provided at positions corresponding to the corners of a quadrilateral, and by adding the necessary drive magnets and coils, the tilt of the carrier 50 and the lens 59 may be controlled simultaneously.

[0057] Furthermore, to achieve weight balance, it is desirable to also provide a slot 58 and a Hall magnet 6 at a position corresponding to the second upright portion 2. The Hall magnet 6 may be dummy. However, if weight balance is achieved, only the first upright portion 1 may be provided around the through-hole 81 of the bottom plate 82, without the second upright portion 2, slot 54, slot 58, and Hall magnet 6. The magnetic detection element is not limited to the Hall IC 8; any component capable of detecting magnetism, such as a Hall element or MR element, may be used.

Claims

1. A lens driving device, characterized in that: have: A quadrilateral base formed by inserting metal parts; A carrier for holding a lens body; a magnetic detection element mounted on the base; and A magnet for magnetic detection mounted on the carrier and facing the magnetic detection element, The base has an upright portion erected from its bottom plate portion. The metal component stands upright inside the upright portion, and the magnetic detection element is mounted on the upright portion and is in electrical communication with the metal component. A coil is wound on the side of the carrier, The magnetism detection magnet is arranged inside the coil on a diagonal line of the quadrilateral base, and the magnetism detection element is arranged inside the magnetism detection magnet.

2. The lens driving device according to claim 1, wherein: Also includes: A shell body combined with the base to form a frame; The driving magnets are fixed to the four sides of the inner surface of the side plate portion of the housing and are parallel to and opposite to the coil with a slight gap therebetween.

3. The lens driving device according to claim 1 or 2, wherein: The bottom plate is provided with a through hole. The upright portion is provided at an edge portion of the through hole.

4. The lens driving device according to claim 1 or 2, wherein: The metal component has a horizontal portion embedded in the bottom plate, one end of the metal component serves as a rising portion protruding into the upright portion, and the other end of the metal component serves as a terminal protruding forward or backward from the bottom plate.

5. The lens driving device according to claim 3, wherein: The metal component has a horizontal portion embedded in the bottom plate, one end of the metal component serves as a rising portion protruding into the upright portion, and the other end of the metal component serves as a terminal protruding forward or backward from the bottom plate.

6. The lens driving device according to claim 4, wherein: The bottom plate portion is provided with a hole so that the horizontal portion and the rising portion can be seen through the hole from the rear side of the bottom plate portion.

7. The lens driving device according to claim 5, wherein: The bottom plate portion is provided with a hole so that the horizontal portion and the rising portion can be seen through the hole from the rear side of the bottom plate portion.

8. The lens driving device according to claim 6 or 7, wherein: have: The base having the horizontal portion and the upright portion of the terminal; and The erected portion having the standing portion, The upright portion is adhesively fixed to the base outside the upright portion. The horizontal portion and the rising portion are electrically joined at the hole.

9. A camera device, characterized in that: A lens driving device according to any one of claims 1 to 8 is provided.

10. An electronic device, characterized in that: A camera device according to claim 9 is provided.

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