Lens driving device, camera device, and electronic equipment

Abstract

The present invention provides a lens driving device, a camera device, and an electronic device that make it difficult for a current path part to fall off. According to one embodiment of the present invention, the lens driving device (1) comprises: a base assembly (12) having a base (20) and a terminal part (21) provided on the base 20; a lens support (30) for fixing the lens body; a driving part (50) generating a driving force for causing the lens support (30) to move relative to the base assembly (12); and a current path part electrically connecting the terminal part (21) and the driving part (50). The base (20) has a rectangular outer shape and a through hole at the center. The terminal part (21) has an external terminal part (121) electrically connected to an external power source and an internal terminal part (122) electrically connected to the current path part. The external terminal part (121) is arranged at a first corner (22a) of the rectangular base (20), and the internal terminal part (122) is arranged at a second corner (22b) adjacent to the first corner (22a).

Description

Technical Field

[0001] The present invention relates to a lens driving device, a camera device and an electronic device. Background Art

[0002] Generally, electronic devices such as smartphones are equipped with a small camera device, and the camera device is equipped with a lens driving device such as that disclosed in Patent Document 1.

[0003] Patent document 1: Chinese patent publication number CN104914547A Summary of the invention

[0004] In the lens driving device, a terminal formed by bending a metal plate is inserted into a base. The terminal has an internal terminal portion exposed from the upper surface of the base and electrically connected to a leaf spring, and an external terminal portion protruding from the lower surface of the base and connected to an external power source. The leaf spring also functions as a current path portion and is electrically connected to the coil. The internal terminal portion and the leaf spring are electrically connected by welding or the like.

[0005] After the lens driving device is completed, the external terminal portion is mounted on the substrate provided with the imaging element by welding. In this way, the heat of the welding is transferred from the external terminal portion to the internal terminal portion, so that the solder fixing the leaf spring is melted again, and the leaf spring may fall off from the terminal.

[0006] An object of the present invention is to provide a lens driving device, a camera device, and an electronic device that solve the above-mentioned problems and make it difficult for a current path portion to fall off.

[0007] In order to achieve the above-mentioned purpose, the lens driving device of the present invention is characterized in that it comprises: a base assembly having a base and a terminal portion arranged on the base; a lens support body for fixing the lens body; a driving portion that generates a driving force for causing the lens support body to move relative to the base assembly; and a current path portion that electrically connects the terminal portion and the driving portion, wherein the base has a rectangular outer shape and a through hole is provided in the center, and the terminal portion has an external terminal portion that is electrically connected to an external power source and an internal terminal portion that is electrically connected to the current path portion, and the external terminal portion is arranged at the first corner of the rectangular base, and the internal terminal portion is arranged at the second corner adjacent to the first corner.

[0008] Furthermore, the present invention provides a camera device including the above-mentioned lens driving device.

[0009] Furthermore, the present invention provides electronic equipment including the above-mentioned camera device.

[0010] According to the present invention, the external terminal is arranged at the first corner of the base, and the internal terminal is arranged at the second corner adjacent to the first corner, so that the distance between the internal terminal and the external terminal can be sufficiently large, and even if the external terminal is welded, heat is difficult to be transferred from the external terminal to the internal terminal. Therefore, the effect of preventing the current path from falling off is obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is an example of an exploded perspective view showing a lens driving device according to an embodiment of the present invention.

[0012] Figure 2 FIG. 1 is an example of a cross-sectional view showing an assembly of a lens driving device according to an embodiment of the present invention.

[0013] Figure 3 FIG. 1 is an example of an exploded perspective view showing a base assembly of a lens driving device according to an embodiment of the present invention.

[0014] Figure 4 FIG. 1 is an example of a perspective view showing a base assembly of a lens driving device according to an embodiment of the present invention.

[0015] Description of symbols

[0016] 1Lens drive device

[0017] 12 base assembly; 18 housing; 20 base; 21 terminal portion; 21a first terminal portion; 21b second terminal portion; 22a to 22d corner portion; 23 opening portion; 24a to 24d fitting piece; 25a to 25d positioning portion; 30 lens support body; 31 thread groove; 32 groove; 33 coil; 34 magnet; 36 washer; 40 lower leaf spring; 41 first lower leaf spring; 41a, 41b outer portion; 41c inner portion; 41d arm portion; 42 second lower leaf spring; 42a, 42b outer Side portion; 42c inner portion; 42d arm portion; 50 driving portion; 60 upper leaf spring; 61 outer portion; 62 inner portion; 63 arm portion; 121, 121a, 121b external terminal portion; 122, 122a, 122b internal terminal portion; 123, 123a, 123b connecting portion; 124, 124a, 124b extension portion; 125, 125a, 125b extension portion; 126 protrusion; 181 hanging portion; 201 base body portion; 202 flange portion; 203 cutout portion. DETAILED DESCRIPTION

[0018] Hereinafter, the lens driving device involved in the embodiment of the present invention will be described in detail with reference to the accompanying drawings. In addition, the present invention is not limited to the following embodiments, and various changes can obviously be made without departing from the main points of the present invention. In addition, the accompanying drawings are schematic, and there are cases where the proportions of various dimensions are different from the actual ones. The specific dimensions, etc. should be determined by referring to the following description. In addition, the drawings obviously also include parts with different dimensional relationships and proportions. In addition, in each of the drawings, the same reference numeral represents the same or equivalent structural element.

[0019] A lens driving device 1 according to an embodiment of the present invention is used for a camera device that is mounted on an electronic device such as a mobile phone or a smart phone to realize a focus adjustment function. For convenience of description, in this embodiment, the photographic object side in the optical axis direction of the lens driving device 1 is also referred to as the front side or the upper side, and the opposite photographic object side is referred to as the rear side or the lower side.

[0020] The lens driving device 1 of this embodiment is as follows: Figure 1 As shown, the lens driving device 1 includes: a base assembly 12; a lens support body 30 that moves relative to the base assembly 12; a lower leaf spring 40 and an upper leaf spring 60 that support the lens support body 30; and a housing 18 that is arranged on the front side of the base assembly 12 so as to accommodate the lens support body 30. In addition, a driving unit 50 that generates a driving force for moving the lens support body 30 relative to the base assembly 12 has a coil 33 and a magnet 34. The lower leaf spring 40 also functions as a current path for supplying current to the coil 33. Through holes are formed in the centers of the base assembly 12, the lens support body 30, the lower leaf spring 40, the upper leaf spring 60, and the housing 18, respectively, and their centers are substantially aligned. In addition, a lens body (not shown) is attached to the through hole of the lens support body 30, and light from the front side, that is, the side of the photographed object, passes through these through holes and the lens body and enters a light receiving sensor (not shown) located on the rear side of the lens driving device 1.

[0021] When viewed from the optical axis of the lens body, the base assembly 12 is in a square shape. Figure 3 As shown, the present invention comprises: a rectangular non-conductive base 20 having a through hole at the center; and a terminal portion 21 formed integrally with the base 20 .

[0022] The base 20 is formed of, for example, an insulating resin material and has a base body 201 having a substantially square shape. Figure 3 and Figure 4As shown, the terminal portion 21 is insert molded (integrally molded) in a state where a portion of it is exposed. A circular opening portion 23 is formed near the center of the base 20 at a position corresponding to the light-receiving sensor not shown. In addition, the base 20 has a flange portion 202 that protrudes outward from the lower side of the outer periphery of the base main body 201 and abuts against the rear end of the housing 18, and a cutout portion 203 is provided on the flange portion 202 that is cut to the side edge of the base main body 201. At the four corners of the base main body 201, engaging pieces 24a to 24d that engage with the inner wall of the housing 18 are vertically provided. In the first corner portions 22a, 22d of the base 20, the external terminal portions 121a, 121b of the terminal portion 21 described later protrude downward from the surface of the lower side of the base main body 201. However, in Figure 4 In the figure, the external terminal portion 121b of the corner portion 22d is not visible. In addition, in the second corner portions 22b and 22c of the base 20 adjacent to the first corner portions 22a and 22d, the internal terminal portions 122a and 122b of the terminal portion 21 described later are exposed from the upper surface of the base body portion 201. In addition, columnar positioning portions 25a to 25d for positioning the lower leaf spring 40 mounted on the base assembly 12 are vertically provided on the upper surface of the first corner portions 22a and 22d and the second corner portions 22b and 22d.

[0023] The terminal portion 21 is used to connect an external power source that supplies current to the drive portion 50 described later, and is formed by a bent plate-shaped metal plate. The external power source is provided outside the lens drive device 1. The terminal portion 21 has an external terminal portion 121 electrically connected to the external power source and an internal terminal portion 122 electrically connected to the lower leaf spring 40 as a current path portion, and the external terminal portion 121 and the internal terminal portion 122 are connected by a connecting portion 123. In addition, the terminal portion 21 has a first terminal portion 21a and a second terminal portion 21b that are independently constructed. In addition, the external terminal portion 121 is arranged at the first corner portions 22a, 22d of the base 20, and the internal terminal portion 122 is arranged at the second corner portions 22b, 22c adjacent to the first corner portions 22a, 22d. The connecting portion 123 extends along the periphery between the first corner portions 22a, 22d and the second corner portions 22b, 22c.

[0024] This is described in more detail below. Figure 3As shown, the terminal portion 21 has the first and second terminal portions 21a, 21b which are arranged line-symmetrically with the virtual center line II of the base 20 as the center axis. The first and second terminal portions 21a, 21b have external terminal portions 121a, 121b and internal terminal portions 122a, 122b. The external terminal portions 121a, 121b are electrically connected to an external power source. The internal terminal portions 122a, 122b are electrically connected to the lower leaf spring 40 as a current path portion described later. In addition, the first and second terminal portions 21a, 21b have connecting portions 123a, 123b which respectively connect the external terminal portions 121a, 121b and the internal terminal portions 122a, 122b. The external terminal portion 121a is arranged at the first corner portion 22a, and the internal terminal portion 122a is arranged at the second corner portion 22b, and the external terminal portion 121b is arranged at the first corner portion 22d, and the internal terminal portion 122b is arranged at the second corner portion 22c. In addition, the connecting portion 123a extends along the periphery between the first corner portion 22a and the second corner portion 22b, and the connecting portion 123b extends along the periphery between the first corner portion 22d and the second corner portion 22c.

[0025] The external terminal portions 121a and 121b are formed by bending downward at one end of the connecting portions 123a and 123b. In addition, the internal terminal portions 122a and 122b are formed by bending twice at the other end of the connecting portions 123a and 123b so as to be located above the connecting portions 123a and 123b. In addition, the connecting portions 123a and 123b change their direction by 90 degrees at the first corner portions 22a and 22d to form first extension portions 124a and 124b extending in a direction orthogonal to the direction in which the connecting portions 123a and 123b extend. In addition, second extension portions 125a and 125b extending in a direction orthogonal to the direction in which the connecting portions 123a and 123b extend are formed from the internal terminal portions 122a and 122b. The second extension portion 125 extends obliquely downward from the internal terminal portion 122 and then changes to a horizontal direction to extend. Thus, the connection parts 123a and 123b are mainly formed in such a manner that they are embedded in the base 20, and then the external terminal parts 121a and 121b of the first terminal part 21a and the second terminal part 21b protrude downward from the surface on the lower side at the first corners 22a and 22d of the base 20, respectively. The internal terminal parts 122a and 122b are exposed from the surface on the upper side at the second corners 22b and 22c adjacent to the first corners 22a and 22d, respectively. The connection parts 123a and 123b extend along the periphery between the first corners 22a and 22d and the second corners 22b and 22c of the base 20.

[0026] In addition, the internal terminal portion 122 of the terminal portion 21 is exposed to the upper surface of the base 20 and is electrically connected to the current path portion described later. The exposed internal terminal portion 122 is formed in a coplanar manner with the surface of the base 20 surrounding the internal terminal portion 122. As described above, the internal terminal portion 122 is formed to stand upright relative to the terminal portion 21 around it, such as the connecting portion 123 or the second extension portion 125. With such a structure, the terminal portion 21 is insert-molded into the base 20, so that a high-strength base assembly 12 can be obtained.

[0027] In addition, a protrusion 126 remaining from the terminal portion 21 and connected to the external frame during insert molding protrudes toward the outside of the base 20. The protrusion 126 is provided in the cutout portion 203 of the base 20.

[0028] return Figure 1 , on the front side of the base assembly 12, the lens support body 30 is supported via the lower leaf spring 40 and the upper leaf spring 60. The lower leaf spring 40 is divided into two, the first and second lower leaf springs 41 and 42, each of which is integrally formed of a metal material (conductive material). The first and second lower leaf springs 41 and 42 also function as a current path portion through which the current supplied to the drive portion 50 flows, and respectively include outer portions 41a, 41b, 42a, 42b and inner portions 41c, 42c and arm portions 41d, 42d. The outer portions 41a, 42a are positioned at the first corner portions 22a, 22d by the positioning portions 25a, 25d, and are fixed to the upper surface of the base 20. The outer portions 41b, 42b are positioned at the second corner portions 22c, 22d by the positioning portions 25b, 25c, and are fixed to the upper surface of the base 20. The inner parts 41c and 42c are fixed to the lower part of the lens support body 30. The arm part 41d connects the outer parts 41a and 41b and the inner part 41c, and the arm part 42d connects the outer parts 42a and 42b and the inner part 42c, and can be elastically deformed. The outer parts 41b and 42b are further electrically connected to the internal terminal parts 122a and 122b by soldering or the like.

[0029] The lens support body 30 is provided with a coil 33 on its outer periphery. The coil 30 constitutes a part of the driving unit 50. In addition, the lens support body 30 is provided with a circular through hole in the center to fix the lens body, and Figure 1 and Figure 2As shown, a thread groove 31 into which the lens body can be screwed can also be provided on its inner periphery. The outer shape of the lens support body 30 is an octagon with the corners of the square cut off when viewed from the front-back direction, and a groove 32 for positioning the coil 33 is provided in the approximate center of its outer periphery. The coil 33 is configured by being wound around the groove 32. One end of the coil 33 is connected to the inner portion 41c of the first lower leaf spring 41, for example, and the other end is connected to the inner portion 42c of the second lower leaf spring 42. Through the above structure, the current supplied from the external power supply to the lens driving device 1 reaches the internal terminal portion 122a from the external terminal portion 121a of the first terminal portion 21a via the connecting portion 123a. Then, it flows from the internal terminal portion 122a to the outer portion 41b of the first lower leaf spring 41 of the lower leaf spring 40, and then reaches the inner portion 41c via the arm portion 41d. Then, the current flows into the coil 30 from the inner portion 41c. The current then flows from the coil 30 through the inner portion 42c, the arm portion 42d, and the outer portion 42b of the second lower leaf spring 42, and then through the inner terminal portion 122b, the connecting portion 123b, and the outer terminal portion 121b of the second terminal portion, and returns to the external power source. In this way, the current can be supplied to the coil 33, and the lower leaf spring 40 functions as a current path portion.

[0030] The upper leaf spring 60 is not divided into two parts like the lower leaf spring 40, but may have the same structure as the lower leaf spring 40. The upper leaf spring 60 includes an outer portion 61 fixed to the washer 36, an inner portion 62 disposed on the upper side of the lens support 30, and an arm portion 63 connecting the outer portion 61 and the inner portion 62, wherein the washer 36 is fixed to the housing 18. The arm portion 63 is elastically deformable.

[0031] The magnet 34 is disposed in the housing 18, and the coil 33 and the magnet 34 constitute a driving unit 50 that generates a driving force for moving the lens support 30 relative to the base assembly 12. Figure 2 As shown, the magnet 34 is bonded to the housing 18 in a manner opposite to the coil 33. Furthermore, the magnet 34 is a rectangular parallelepiped, and one is disposed on the inner side of each side wall of the housing 18. Therefore, when current flows through the coil 33, an electromagnetic force is generated between the magnet 34 and the coil 33, thereby being able to drive the relative movement of the lens support body 30 and the base assembly 12.

[0032] The housing 18 is arranged on the front side of the base assembly 12, and a substantially circular through hole is opened in the center so as to be assembled to the base assembly 12 in a manner that the lens support body 30 is contained inside. The housing 18 can also be formed of a magnetic body. When the housing 18 is assembled with the base assembly 12, the engaging pieces 24a to 24d of the base 20 are engaged with the housing 18, and the flange portion 202 abuts against the lower end of the housing 18 and is fixed by an adhesive. In addition, a hanging portion 181 hanging down to the rear side is formed corresponding to each corner of the housing 18. The hanging portion 181 of the housing 18 is arranged in a manner to be accommodated in a recessed portion formed on the outer periphery of the lens support body 30, and can function as a stopper for the rotation or movement of the lens support body 30.

[0033] Thus, in the lens driving device 1 of the present embodiment, the external terminal portion 121 of the terminal portion 21 is arranged at the first corner portion 22a of the base 20, and the internal terminal portion 122 is arranged at the second corner portion 22b adjacent to the first corner portion 22a. Therefore, the distance between the internal terminal portion 122 and the external terminal portion 121 can be ensured to be sufficiently large. Even if the external terminal portion 121 is welded after the lens driving device 1 is completed, it is difficult for heat to be transferred from the external terminal portion 121 to the internal terminal portion 122. Therefore, there is an effect that the lower leaf spring 40, which serves as the current path portion, is not easy to fall off.

[0034] In addition, in the present embodiment, the terminal portion 21 is formed integrally with the base 20 by insert molding, but it may be fixed by an adhesive or the like. In addition, the drive portion 50 is composed of the coil 33 and the magnet 34, but it is not limited to this, and for example, a piezoelectric element or a shape memory alloy may be used. In addition, as the current path portion, a leaf spring is used, but it is not limited to this, and it may be a lead wire only.

[0035] The lens driving device 1 of the embodiment of the present invention can be constituted by the above structure, but the lens driving device 1 can also be installed in a camera device, and the camera device having the lens driving device 1 can also be installed in an electronic device. As the electronic device, there are portable terminals such as smart phones, game consoles, and personal computers. These portable terminals can also include a camera device having the lens driving device 1.

Claims

1. A lens driving device, characterized in that: have: A base assembly having a base and a terminal portion disposed on the base; A lens support body for fixing the lens body; A driving unit that generates a driving force for causing the lens support body to move relative to the base assembly body; as well as a current path portion electrically connecting the terminal portion and the drive portion, The base is rectangular in shape and has a through hole in the center. The terminal portion includes an external terminal portion electrically connected to an external power source and an internal terminal portion electrically connected to the current path portion. The external terminal portion is arranged at a first corner portion of the rectangular base, and the internal terminal portion is arranged at a second corner portion adjacent to the first corner portion.

2. The lens driving device according to claim 1, wherein: The terminal portion includes a connecting portion connecting the external terminal portion and the internal terminal portion, and the connecting portion extends along a peripheral edge between the first corner portion and the second corner portion.

3. The lens driving device according to claim 1, wherein: The terminal portion includes first and second terminal portions that are arranged line-symmetrically with respect to a virtual center line of the base as a center axis, and the first and second terminal portions respectively include the external terminal portion and the internal terminal portion.

4. The lens driving device according to claim 1, wherein: At least a portion of the terminal portion is buried inside the base.

5. The lens driving device according to claim 4, wherein: The internal terminal portion is exposed from the base and electrically connected to the current path portion, and the internal terminal portion is flush with a surface of the base surrounding the internal terminal portion.

6. The lens driving device according to claim 5, wherein: The internal terminal portion is formed to stand upright relative to the terminal portions surrounding the internal terminal portion.

7. The lens driving device according to claim 2, wherein: The terminal portion further extends from at least one of the external terminal portion or the internal terminal portion in a direction perpendicular to a direction in which the connecting portion extends to form an extending portion. 8 . A camera device comprising the lens driving device according to claim 1 .

9. An electronic device comprising the camera device according to claim 8.

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