CN110895365A - Lens driving device, camera device, and electronic apparatus - Google Patents

Abstract

The invention provides a lens driving device, a camera device and an electronic device, which make a current path part difficult to fall off. A lens driving device (1) according to one embodiment of the present invention includes: a base assembly (12) having a base (20) and a terminal section (21) provided on the base (20); a lens support body (30) for fixing the lens body; a drive unit (50) for generating a drive force for moving the lens support body (30) relative to the base assembly (12); and a current path portion electrically connecting the terminal portion (21) and the drive portion (50). The base (20) is rectangular in shape and has a through hole at the center, the terminal section (21) has an external terminal section (121) electrically connected to an external power supply and an internal terminal section (122) electrically connected to the current path section, the external terminal section (121) is disposed at a 1 st corner section (22a) of the rectangular base (20), and the internal terminal section (122) is disposed at a 2 nd corner section (22b) adjacent to the 1 st corner section (22 a).

Description

Lens driving device, camera device, and electronic apparatus

Technical Field

The invention relates to a lens driving device, a camera device and an electronic apparatus.

Background

In general, a small camera device is mounted on an electronic device such as a smartphone, and a lens driving device such as that shown in patent document 1 is mounted on the camera device.

Patent document 1: chinese patent publication No. CN104914547A

Disclosure of Invention

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

The lens driving device is mounted on a substrate provided with an image pickup element by soldering an external terminal portion after completion. Thus, the heat of the soldering is transmitted from the external terminal portion to the internal terminal portion, and the solder for fixing the plate spring is re-melted, so that the plate spring may be detached from the terminal.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a lens driving device, a camera device, and an electronic apparatus, which make a current path portion less likely to come off.

In order to achieve the above object, a lens driving device according to the present invention includes: a base assembly having a base and a terminal portion provided on the base; a lens support for fixing the lens body; a driving unit for generating a driving force for moving the lens support relative to the base assembly; and a current path portion electrically connecting the terminal portion and the driving portion, wherein the base has a rectangular outer shape and a through hole at a center thereof, the terminal portion includes an external terminal portion electrically connected to an external power supply and an internal terminal portion electrically connected to the current path portion, the external terminal portion is disposed at a 1 st corner portion of the rectangular base, and the internal terminal portion is disposed at a 2 nd corner portion adjacent to the 1 st corner portion.

The present invention also provides a camera device including the lens driving device.

The present invention further provides an electronic device including the camera device.

According to the present invention, the external terminal portion is disposed at the 1 st corner portion of the base, and the internal terminal portion is disposed at the 2 nd corner portion adjacent to the 1 st corner portion, so that a distance between the internal terminal portion and the external terminal portion can be sufficiently secured, and heat is hardly transferred from the external terminal portion to the internal terminal portion even if the external terminal portion is soldered. Therefore, the current path portion is not easily detached.

Drawings

Fig. 1 is an example of an exploded perspective view showing a lens driving device according to an embodiment of the present invention.

Fig. 2 is an example of a sectional view showing an assembly of a lens driving device according to an embodiment of the present invention.

Fig. 3 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.

Fig. 4 is an example of a perspective view showing a base assembly of a lens driving device according to an embodiment of the present invention.

Description of the reference symbols

1 lens driving device

12 a base assembly; 18 a housing; 20 a base; 21 terminal part; 21a 1 st terminal part; 21b 2 nd terminal part; 22a to 22d corner portions; 23 an opening part; 24a to 24 d; 25a to 25 d; 30 a lens support; 31 a thread groove; 32 grooves; 33 coils; 34 a magnet; 36 washers; 40 lower leaf springs; 41 1 st lower leaf spring; 41a, 41b outer side portions; 41c inner side portion; 41d arm parts; 42 nd 2 nd lower leaf spring; 42a, 42b outer side portions; 42c inner side portion; 42d arm parts; 50 a drive section; 60 upper side leaf springs; 61 outer side portion; 62 inner side part; 63 an arm section; 121. 121a, 121b external terminal portions; 122. 122a, 122b internal terminal portions; 123. 123a, 123 b; 124. 124a, 124b extensions; 125. 125a, 125b extensions; 126 are protruded; 181 vertical lower part; 201 a base body portion; 202 flange portion; 203 is cut out.

Detailed Description

Hereinafter, a lens driving device according to an embodiment of the present invention will be described in detail with reference to the drawings. The present invention is not limited to the following embodiments, and various modifications can be made without departing from the scope of the present invention. The drawings are schematic, and the proportions of the dimensions and the like may be different from those in reality. Specific dimensions and the like are determined by referring to the following description. In addition, it is obvious that the drawings include portions having different dimensional relationships and ratios from each other. In the drawings, the same reference numerals denote the same or equivalent components.

The lens driving device 1 according to one embodiment of the present invention is used for a camera device that is mounted on an electronic apparatus such as a mobile phone or a smart phone to realize a focus adjustment function. For convenience of explanation, in the present embodiment, the subject 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 subject side is also referred to as the rear side or the lower side.

As shown in fig. 1, a lens driving device 1 of the present embodiment includes: a base assembly 12; a lens support 30 that moves relative to the base assembly 12; a lower plate spring 40 and an upper plate spring 60 for supporting the lens support body 30; and a housing 18 disposed on the front side of the base assembly 12 so as to accommodate the lens support 30. The driving unit 50 for generating a driving force to move the lens support 30 relative to the base assembly 12 includes a coil 33 and a magnet 34. The lower plate spring 40 also functions as a current path portion for supplying current to the coil 33. Through holes are formed in the centers of the base assembly 12, the lens support 30, the lower plate spring 40, the upper plate spring 60, and the housing 18, respectively, and the centers thereof are substantially aligned with each other. Further, a lens body (not shown) is attached to the through hole of the lens support 30, and light from the front side, i.e., the subject side, passes through the through hole and the lens body and enters a light receiving sensor (not shown) located on the rear side of the lens driving device 1.

The base assembly 12 is square when viewed from the optical axis direction of the lens body, and as shown in fig. 3, includes: a rectangular non-conductive base 20 having a through hole at the center; and a terminal portion 21 formed integrally with the base 20.

The base 20 is formed of, for example, an insulating resin material, has a substantially rectangular base main body portion 201, and is insert-molded (integrally molded) with a terminal portion 21 partially exposed as shown in fig. 3 and 4. A circular opening 23 is formed near the center of the base 20 at a position corresponding to a light receiving sensor, not shown. The base 20 has a flange portion 202 protruding outward from the lower side of the outer periphery of the base body 201 and abutting against the rear end of the housing 18, and the flange portion 202 is provided with a notch portion 203 cut to the side edge of the base body 201. Fitting pieces 24a to 24d that fit into the inner wall of the housing 18 are erected at four corners of the base main body 201. In the 1 st corner portions 22a and 22d of the base 20, external terminal portions 121a and 121b of the terminal portion 21, which will be described later, protrude downward from the lower surface of the base main body portion 201. However, in fig. 4, the external terminal portion 121b of the corner portion 22d is not visible. In addition, in the 2 nd corner portions 22b and 22c of the base 20 adjacent to the 1 st corner portions 22a and 22d, internal terminal portions 122a and 122b of the terminal portion 21, which will be described later, are exposed from the upper surface of the base main body portion 201. Further, columnar positioning portions 25a to 25d for positioning the lower leaf spring 40 attached to the base assembly 12 are provided upright on the upper surface of the 1 st corner portions 22a and 22d and the 2 nd corner portions 22b and 22 d.

The terminal portion 21 is formed by bending a plate-shaped metal plate for connecting an external power supply for supplying a current to a driving portion 50 described later. The external power supply is provided outside the lens driving device 1. The terminal portion 21 includes an external terminal portion 121 electrically connected to an external power supply 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 coupled to each other by a coupling portion 123. The terminal portion 21 has a 1 st terminal portion 21a and a 2 nd terminal portion 21b which are independently configured. The external terminal portion 121 is disposed at the 1 st corner portions 22a, 22d of the base 20, and the internal terminal portion 122 is disposed at the 2 nd corner portions 22b, 22c adjacent to the 1 st corner portions 22a, 22 d. The coupling portion 123 extends along the peripheral edge between the 1 st corner portions 22a, 22d and the 2 nd corner portions 22b, 22 c.

This is explained in more detail below. As shown in fig. 3, the terminal portion 21 has the 1 st and 2 nd terminal portions 21a and 21b which are arranged line-symmetrically with respect to the virtual center line I-I of the base 20. The 1 st and 2 nd terminal portions 21a and 21b have external terminal portions 121a and 121b and internal terminal portions 122a and 122 b. The external terminal portions 121a and 121b are electrically connected to an external power supply. The inner terminal portions 122a and 122b are electrically connected to a lower plate spring 40 as a current path portion described later. The 1 st and 2 nd terminal portions 21a and 21b have coupling portions 123a and 123b for coupling the external terminal portions 121a and 121b and the internal terminal portions 122a and 122b, respectively. The external terminal portion 121a is disposed at the 1 st corner portion 22a, the internal terminal portion 122a is disposed at the 2 nd corner portion 22b, the external terminal portion 121b is disposed at the 1 st corner portion 22d, and the internal terminal portion 122b is disposed at the 2 nd corner portion 22 c. In addition, the joint 123a extends along the peripheral edge between the 1 st corner 22a and the 2 nd corner 22b, and the joint 123b extends along the peripheral edge between the 1 st corner 22d and the 2 nd corner 22 c.

The external terminal portions 121a and 121b are formed by bending downward at one end of the coupling portions 123a and 123 b. The internal terminal portions 122a and 122b are bent twice at the other end portions of the coupling portions 123a and 123b, and are formed so as to be located above the coupling portions 123a and 123 b. The coupling portions 123a, 123b are changed in orientation to 90 degrees at the 1 st corner portions 22a, 22d, and form 1 st extending portions 124a, 124b extending in a direction orthogonal to the direction in which the coupling portions 123a, 123b extend. Further, from the internal terminal portions 122a and 122b, second extending portions 125a and 125b extending in a direction orthogonal to the direction in which the coupling portions 123a and 123b extend are formed. The 2 nd extending portion 125 extends obliquely downward from the inner terminal portion 122, and further extends in a horizontal direction. Accordingly, the coupling portions 123a and 123b are molded to be embedded in the base 20, and the external terminal portions 121a and 121b of the 1 st and 2 nd terminal portions 21a and 21b protrude downward from the lower surface at the 1 st corner portions 22a and 22d of the base 20, respectively. The internal terminal portions 122a and 122b are exposed from the upper surfaces of the 2 nd corner portions 22b and 22c adjacent to the 1 st corner portions 22a and 22d, respectively. The connection portions 123a, 123b extend along the peripheral edge between the 1 st corner portions 22a, 22d and the 2 nd corner portions 22b, 22c of the base 20.

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 a current path portion described later. The exposed internal terminal portion 122 is formed to be coplanar 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 up with respect to the terminal portion 21 around it, for example, the coupling portion 123 or the 2 nd extending portion 125. With such a structure, the terminal portion 21 is insert-molded into the base 20, and thus the base assembly 12 having high strength can be obtained.

Further, the terminal portion 21 projects outward from the base 20 with a projection 126 remaining to be connected to an external housing at the time of insert molding. The protrusion 126 is disposed in the cutout portion 203 of the base 20.

Returning to fig. 1, the lens support body 30 is supported on the front side of the base assembly 12 via a lower plate spring 40 and an upper plate spring 60. The lower plate spring 40 is divided into two 1 st and 2 nd lower plate springs 41 and 42, and is integrally formed of a metal material (conductive material). The 1 st and 2 nd lower leaf springs 41 and 42 also function as current path portions through which current supplied to the drive portion 50 flows, and include outer portions 41a, 41b, 42a, and 42b, inner portions 41c and 42c, and arm portions 41d and 42d, respectively. The outer portions 41a and 42a are positioned by the positioning portions 25a and 25d at the 1 st corner portions 22a and 22d, and fixed to the upper surface of the base 20. The outer portions 41b and 42b are positioned by the positioning portions 25b and 25c at the 2 nd corner portions 22c and 22d, and fixed to the upper surface of the base 20. The inner portions 41c and 42c are fixed to the lower portion of the lens support 30. The arm 41d connects the outer portions 41a, 41b and the inner portion 41c, and the arm 42d connects the outer portions 42a, 42b and the inner portion 42c, and is elastically deformable. The outer portions 41b and 42b are further electrically connected to the inner terminal portions 122a and 122b by solder or the like.

The lens support 30 has a coil 33 disposed on the outer periphery thereof. The coil 30 constitutes a part of the driving section 50. The lens support 30 may have a circular through hole in the center thereof to which the lens body can be fixed, and may have a screw groove 31 in the inner periphery thereof to which the lens body can be screwed, as shown in fig. 1 and 2. The lens support 30 has an octagonal shape with corners cut off when viewed from the front-rear direction, and a notch 32 for positioning a coil 33 is provided at a substantially central portion of the outer periphery thereof. 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 1 st lower leaf spring 41, for example, and the other end is connected to the inner portion 42c of the 2 nd lower leaf spring 42. With the above configuration, 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 1 st terminal portion 21a via the coupling portion 123 a. Then, the internal terminal portion 122a flows toward the outer portion 41b of the 1 st lower leaf spring 41 of the lower leaf spring 40, and further reaches the inner portion 41c via the arm portion 41 d. Then, the current flows from the inner portion 41c into the coil 30. The current is returned from the coil 30 to the external power supply via the inner portion 42c, the arm portion 42d, and the outer portion 42b of the 2 nd lower plate spring 42, and further via the inner terminal portion 122b, the coupling portion 123b, and the external terminal portion 121b of the 2 nd terminal portion. Thus, a current can be supplied to the coil 33, and the lower plate spring 40 functions as a current path portion.

The upper leaf spring 60 is not divided into two parts like the lower leaf spring 40, but may have the same configuration as the lower leaf spring 40. The upper plate spring 60 has 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.

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. As shown in fig. 2, the magnet 34 is bonded to the case 18 so as to face the coil 33. Further, the magnets 34 are rectangular parallelepiped, and are disposed one inside each of the side walls of the casing 18. Therefore, when a current flows through the coil 33, an electromagnetic force is generated between the magnet 34 and the coil 33, and the lens support 30 and the base assembly 12 can be driven to move relative to each other.

The housing 18 is disposed on the front side of the base assembly 12, and has a substantially circular through hole opened at the center thereof, and is assembled to the base assembly 12 so as to include the lens support 30 therein. The housing 18 may also be formed of a magnetic body. When the housing 18 is assembled to the base assembly 12, the fitting pieces 24a to 24d of the base 20 are fitted to the housing 18, and the flange portion 202 is fixed by an adhesive while being in contact with the lower end of the housing 18. In addition, a hanging portion 181 hanging down to the rear side is formed corresponding to each corner portion of the housing 18. The hanging portion 181 of the housing 18 is disposed so as to be accommodated in a recess formed in the outer periphery of the lens support 30, and can function as a stopper against rotation or movement of the lens support 30.

In this way, in the lens drive device 1 of the present embodiment, the external terminal portion 121 of the terminal portion 21 is disposed at the 1 st corner portion 22a of the base 20, and the internal terminal portion 122 is disposed at the 2 nd corner portion 22b adjacent to the 1 st corner portion 22 a. Therefore, a distance between the internal terminal portion 122 and the external terminal portion 121 can be sufficiently secured. Even if the external terminal portion 121 is soldered after the lens driving device 1 is completed, heat is hard to be transferred from the external terminal portion 121 to the internal terminal portion 122. Therefore, the lower plate spring 40 as the current path portion is not easily detached.

In the present embodiment, the terminal portion 21 is integrally formed by insert molding to the base 20, but may be fixed by an adhesive or the like. The driving unit 50 is composed of the coil 33 and the magnet 34, but is not limited thereto, and for example, a piezoelectric element, a shape memory alloy, or the like may be used. Further, a plate spring is used as the current path section, but the current path section is not limited to this and may be a lead wire.

With the above configuration, the lens driving device 1 according to the embodiment of the present invention can be configured, but the lens driving device 1 may be incorporated in a camera device, and a camera device including the lens driving device 1 may be incorporated in an electronic apparatus. Examples of the electronic device include a mobile terminal such as a smartphone, a game machine, and a personal computer. These portable terminals may include a camera device including the lens driving device 1.

Claims (9)

1. A lens driving device is characterized by comprising:

a base assembly having a base and a terminal portion provided on the base;

a lens support for fixing the lens body;

a driving unit for generating a driving force for moving the lens support relative to the base assembly; and

a current path portion electrically connecting the terminal portion and the driving portion,

the base is rectangular in shape, and a through hole is arranged in the center,

the terminal portion has an external terminal portion electrically connected to an external power supply and an internal terminal portion electrically connected to the current path portion,

the external terminal portion is disposed at a 1 st corner portion of the rectangular base, and the internal terminal portion is disposed at a 2 nd corner portion adjacent to the 1 st corner portion.

2. The lens driving device according to claim 1,

the terminal portion has a coupling portion that couples the external terminal portion and the internal terminal portion, and the coupling portion extends along a peripheral edge between the 1 st corner portion and the 2 nd corner portion.

3. The lens driving device according to claim 1,

the terminal portion includes a 1 st terminal portion and a 2 nd terminal portion which are arranged line-symmetrically with a virtual center line of the base as a center axis, and the 1 st terminal portion and the 2 nd terminal portion have the external terminal portion and the internal terminal portion, respectively.

4. The lens driving device according to claim 1,

at least a part of the terminal portion is embedded in the base.

5. The lens driving device according to claim 4,

the internal terminal portion is exposed from the base and electrically connected to the current path portion, and the internal terminal portion is coplanar with a surface of the base surrounding the internal terminal portion.

6. The lens driving device according to claim 5,

the internal terminal portion is formed so as to rise from the terminal portion around the internal terminal portion.

7. The lens driving device according to claim 2,

the terminal portion further extends from at least one of the external terminal portion and the internal terminal portion in a direction orthogonal to a direction in which the coupling portion extends to form an extending portion.

8. A camera device provided with the lens driving device according to any one of claims 1 to 7.

9. An electronic device provided with the camera device according to claim 8.

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