Lens driving device, camera device, and electronic equipment

Abstract

The present invention provides a lens driving device, a camera device and an electronic device, which can obtain a more efficient vibration reduction effect through a simple structure. The lens driving device (1) has a fixed part and a movable part, and the movable part has a holding part for holding a lens body (4) and moves relative to the fixed part. Thus, the fixed part and the movable part are opposite to each other, and a pin (8) is provided on a base (60) as the fixed part, and the pin (8) protrudes toward a bracket (40) as the movable part, and a viscoelastic resin is provided in a manner to connect the bracket (40) and the pin (8).

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 smart phones. Background Art

[0002] In some camera devices equipped with an autofocus function, a gel-like buffer material is used to suppress resonance caused by the drive of a bracket held in a frame. Patent Document 1 is a document that discloses technology related to such a camera device. The camera device disclosed in Patent Document 1 has a substantially quadrilateral base and a substantially octagonal bracket supported on the base. A column having an adhesive groove is provided at a corner of the base, and a coated support surface protruding toward the adhesive groove is provided on a corner surface of the bracket facing the adhesive groove, and a buffer glue is applied between the adhesive groove and the coated support surface. In this camera device, the mechanical energy of the bracket is converted into the internal energy of the buffer glue, thereby suppressing the resonance of the bracket.

[0003] [Prior art literature]

[0004] [Patent Literature]

[0005] [Patent Document 1] China Gazette No. 209044147U Summary of the invention

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

[0007] However, the technique of Patent Document 1 has a problem in that it is necessary to provide an adhesive groove on the base and to provide a coating expansion surface on the bracket, which makes the structure complicated.

[0008] The present invention has been made in view of the above problems, and an object of the present invention is to provide a lens driving device capable of obtaining a more efficient vibration reduction effect with a simple structure.

[0009]

Methods used to solve the problem

[0010] In order to solve the above-mentioned problems, a lens driving device as a preferred embodiment of the present invention is characterized in that it comprises a fixed part and a movable part, the movable part has a holding part for holding the lens and moves relative to the fixed part, the fixed part and the movable part are opposite to each other, a pin protruding toward the other side is provided on one of the fixed part and the movable part, and a viscoelastic resin is provided in such a manner that the other side and the pin are connected.

[0011] In this aspect, a recess may be provided on the other side, and the recess and the side surface of the pin may face each other.

[0012] Furthermore, the pin may protrude in a direction parallel to a moving direction of the movable portion.

[0013] Alternatively, the movable portion may have a bracket having a through hole as the retaining portion, the fixed portion may have a base supporting the bracket to move freely from the rear side, the recess may be provided at the rear of the bracket, and the pin may be provided at a rear side position of the recess on the front surface of the base.

[0014] Furthermore, the bracket may include a coil wound around the bracket, the recess may be hollowed out at the front side and opened at the side, and the side open portion of the recess may be covered by the coil.

[0015] Furthermore, the pin may protrude in a direction perpendicular to a moving direction of the movable portion.

[0016] Alternatively, the movable part may include: a bracket having a holding part for holding the lens; and an intermediate supporting body which supports the bracket so as to be movably supported in a direction parallel to the optical axis of the lens, and the fixed part includes a base which supports the intermediate supporting body so as to be movably supported in a direction orthogonal to the optical axis of the lens, the intermediate supporting body is provided with the recess, and the base is provided with the pin.

[0017] A camera device according to another preferred embodiment of the present invention is characterized by including the above-mentioned lens driving device.

[0018] Another preferred embodiment of the present invention is an electronic device comprising the camera device described above.

[0019] [Effects of the invention]

[0020] The lens driving device of the present invention comprises a fixed part and a movable part, wherein the movable part has a holding part for holding a lens and moves relative to the fixed part, the fixed part and the movable part are opposite to each other, a pin protruding toward the other side is provided on one side of the fixed part and the movable part, and a viscoelastic resin is provided in a manner that connects the other side and the pin. Thus, the viscoelastic resin can suppress vibration caused by the driving of the movable part. Therefore, a lens driving device that can obtain a more efficient vibration reduction effect with a simple structure can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a smartphone 100 equipped with a camera device 9 including the lens driving device 1 according to the first embodiment of the present invention.

[0022] Figure 2 It is decomposed Figure 1 A stereoscopic view of the lens driving device 1.

[0023] Figure 3It is a perspective view showing a holder 40 and a base 60 in a lens driving device 1 as a modified example of the present invention.

[0024] Figure 4 It is a perspective view showing an intermediate support body 40A and a base 60A in a lens driving device 1A according to a second embodiment of the present invention.

[0025] Figure 5 Observe from another direction Figure 4 A three-dimensional view of the intermediate support body 40A and the base 60A.

[0026]

Explanation of symbols

[0027] 1, 1A lens drive device; 4 lens body; 6 image sensor; 8, 108 pin; 9 camera device; 10 housing; 11, 41, 61 through hole; 12 top plate; 13 side plate; 15, 47, 48, 147 recess; 20 barrier; 30 front spring; 31, 51 inner side; 32, 52 outer side; 33, 53 wrist; 40 bracket; 40A intermediate support body; 45 side; 46 Angle surface; 50 Rear spring; 54 Mounting portion; 60, 60A base; 62 Bottom plate portion; 64, 164 Column portion; 65 Support plate portion; 67, 68, 88, 140, 141, 161 Opening; 70 Coil; 73 Magnet; 80 Hall magnet; 81 Counterweight component; 82 FPC; 85 Terminal; 100 Smart phone; 143, 144, 146, 165 Plate portion; 166 Peripheral wall portion. DETAILED DESCRIPTION

[0028] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0029] <First Embodiment>

[0030] like Figure 1 As shown, a camera device 9 including a lens driving device 1 according to a first embodiment of the present invention is accommodated in a housing of a smartphone 100 .

[0031] The camera device 9 includes a lens body 4 , an image sensor 6 that converts light incident through the lens body 4 into an image signal, and a lens driving device 1 that holds the lens body 4 and the image sensor 6 and drives the lens body 4 .

[0032] Hereinafter, the optical axis direction of the lens body 4 is appropriately referred to as the Z direction, a direction orthogonal to the Z direction is appropriately referred to as the X direction, and a direction orthogonal to both the Z direction and the X direction is appropriately referred to as the Y direction. In addition, the side of the subject viewed from the lens body 4 is sometimes referred to as the front side, and the opposite side (the side of the image sensor 6) is sometimes referred to as the rear side. The front side corresponds to the +Z side, and the rear side corresponds to the -Z side.

[0033] The lens driving device 1 is formed by accommodating a bracket 40, a coil 70, a barrier 20, a front spring 30, two rear springs 50, two magnets 73, a Hall magnet 80, a Hall sensor (not shown), and an FPC (Flexible printed circuits) 82 in a frame formed by combining a base 60 and a housing 10. Among these components, the fixed part includes the base 60, the housing 10, the magnet 73, the barrier 20, the Hall sensor, and the FPC 82, and the movable part that moves relative to the fixed part in the Z direction includes the bracket 40, the coil 70, the Hall magnet 80, and the weight component 81.

[0034] The following describes the details of the structure of each part. The housing 10 has a top plate portion 12 in a quadrilateral shape and four side plate portions 13 extending from the four sides of the top plate portion 12 on the -Z side. A through hole 11 is provided at the center of the top plate portion 12. A recess 15 recessed toward the +Z side is provided at the rear end of the side plate portion 13 on the +X side.

[0035] The base 60 includes a bottom plate portion 62 in a quadrilateral shape, four pillar portions 64 protruding from four corners of the bottom plate portion 62 toward the +Z side, and a support plate portion 65 rising toward the +Z side from the end edge of the bottom plate portion 62 on the +X side. A through hole 61 is provided at the center of the bottom plate portion 62. Two rectangular openings 67 and 68 are provided in the support plate portion 65.

[0036] The FPC 82 is used to supply current to the Hall sensor and the coil 70 from the main body of the camera device 9. The FPC 82 is in a quadrilateral shape. Four terminals 85 are provided at the rear end of the FPC 82. The four terminals 85 are electrically connected to the Hall sensor. A rectangular opening 88 is provided in front of the terminals 85 on the +Y side and the -Y side of the FPC 82. The outer side portions 52 of the two rear springs 50 described later are electrically connected to the FPC 82 at the portion of the opening 88, and the rear springs 50 are electrically connected to the Hall sensor. The Hall sensor is fixed at a position adjacent to the opening 88 on the +Y side of the surface on the -X side of the FPC 82. The FPC 82 is fixed to the support plate portion 65 with the fixed surface of the Hall sensor facing the support plate portion 65. The Hall sensor is accommodated in the opening 67 of the support plate portion 65 from the +X side of the opening 67.

[0037] The bracket 40 has an octagonal shape with four corners of the quadrilateral chamfered when viewed from the Z direction. A through hole 41 as a holding portion for holding the lens body 4 is provided at the center of the bracket 40. The bracket 40 has two pairs of side surfaces 45 facing each other in the X direction and the Y direction corresponding to the four sides, and two pairs of diagonal surfaces 46 corresponding to the four corners. The coil 70 is wound around the side surfaces 45 and the diagonal surfaces 46 of the bracket 40 with the Z direction as the axis.

[0038] Two recesses 47 are present on the rear surface of the bracket 40 at the +Y end of the +X side of the quadrilateral and at the -Y end of the -X side. The two recesses 47 are located symmetrically with respect to the center point of the through hole 41.

[0039] The two recesses 47 are in the shape of a rectangular parallelepiped with the front side hollowed out. The side of the recess 47 located on the +X side is open to the +X side, and the side of the recess 47 located on the -X side is open to the -X side. The open parts of the +X side and the -X side of the two recesses 47 are covered by the coil 70. The recess 47 on the +X side of the two recesses 47 accommodates the Hall magnet 80. The Hall magnet 80 sandwiches the coil 70 between them and is opposite to the aforementioned Hall sensor. The recess 47 on the -X side accommodates a counterweight component 81. The counterweight component 81 is used to obtain a balance with the Hall magnet 80.

[0040] The rear surface of the bracket 40 has two recesses 48 at the -Y end of the +X side of the quadrilateral and at the +Y end of the -X side. The two recesses 48 are located symmetrically with respect to the center point of the through hole 41.

[0041] The two recesses 48 are in the shape of a rectangular parallelepiped hollowed out at the front side, and the side of the recess 48 located on the +X side is open to the +X side, and the side of the recess 48 located on the -X side is open to the -X side. The open parts of the +X side and -X side of the two recesses 48 are covered by the coil 70. A resin having viscoelasticity as described later is provided in the two recesses 48. The resin having viscoelasticity is a so-called buffer glue, and the rear surface is marked as "viscoelastic resin".

[0042] The barrier member 20 is in the shape of a quadrilateral ring and is mounted on the rear surface of the top plate portion 12 of the housing 10. The front spring 30 includes an inner portion 31, an outer portion 32, and four arm portions 33 connecting the inner portion 31 and the outer portion 32. The inner portion 31 is in the shape of a circular ring and is formed along the front peripheral edge of the through hole 41 of the bracket 40 and is mounted thereon. The outer portion 32 is in the shape of a quadrilateral ring and is mounted on the barrier member 20.

[0043] The two rear springs 50 have a quadrilateral shape as a whole. The two rear springs 50 are separated in the ±Y direction and electrically insulated from each other. The two rear springs 50 respectively have an inner portion 51, an outer portion 52, and two arm portions 53 connecting the two. The inner portion 51 is formed in a shape along the rear peripheral edge of the through hole 41 of the bracket 40 and is installed there. At both ends of the outer portion 52, there are mounting portions 54 formed in a shape avoiding the column portion 64, which are installed on the bottom plate portion 62 of the base 60. In addition, the two mounting portions 54 on the +X side are electrically connected to the FPC 82 respectively. The inner portion 51 has an electrical connection portion electrically connected to the coil 70.

[0044] Magnets 73 are fixed to the inner surfaces of the side plates 13 on the +Y side and the -Y side of the housing 10. The lower ends of the side plates 13 of the housing 10 are fixed to the front peripheral edges of the bottom plate 62 of the base 60. The magnets 73 are parallel to and face the coil 70 with a slight gap therebetween.

[0045] A metal pin 8 is provided at the rear side of the recess 48 on the front surface of the base 60. The pin 8 is in the shape of an elongated cylindrical column. The pin 8 protrudes toward the bracket 40 in a direction parallel to the Z direction, which is the moving direction of the movable part. The pin 8 can be formed simultaneously with the manufacturing of the base 60 by insert molding, or can be provided by other methods such as bonding. The front end of the pin 8 is inserted into the recess 48, that is, the side surface of the pin 8 and the recess 48 are opposite, and the viscoelastic resin is provided so that the recess 48 and the pin 8 are connected.

[0046] When current is supplied to the coil 70 from the body of the camera device 9 via the rear spring 50, the movable portion moves in the Z direction by electromagnetic action between the coil 70 and the magnet 73. When the movable portion moves to the +Z side, the shallow position of the recess 48 faces the front end of the pin 8, and when the movable portion moves to the -Z side, the deep position of the recess 48 faces the front end of the pin 8.

[0047] The above are the structural details of the first embodiment. The lens driving device 1 of the first embodiment includes a fixed portion and a movable portion, and the movable portion has a holding portion for holding the lens body 4 and moves relative to the fixed portion. The fixed portion and the movable portion are opposite to each other, and a pin 8 protruding toward the bracket 40 as the movable portion is provided on the base 60 as the fixed portion, and a viscoelastic resin is provided in a manner that the bracket 40 and the pin 8 are connected. Thus, the viscoelastic resin can suppress vibration caused by the driving of the movable portion. Therefore, it is possible to provide a lens driving device 1 that can obtain a more efficient vibration reduction effect through a simple structure.

[0048] Among them, in the first embodiment, if Figure 3 As shown, the pin 8 may be a flat rectangular plate. In this case, the base 60 is formed as a component by inserting a metal component, and one end of the inserted metal component is formed as the pin 8 and protrudes forward from the end side of the base 60. In addition, an example of two pins 8 is shown, but three or more pins may be used.

[0049] In addition, in the first embodiment, the viscoelastic resin may be filled from the bottom of the recess 48, or may be formed by connecting only the side of the pin 8 and the side of the recess 48. In addition, the viscoelastic resin may be supplied and arranged by utilizing the open portion of the recess 48 not covered by the coil 70. In addition, the recess 48 has a bottom, but it may be set so as to penetrate to the front surface of the bracket 40. In this case, the viscoelastic resin can be supplied from the front surface side of the bracket 40.

[0050] In the first embodiment, the recess 48 need not be provided, and the front end of the pin 8 and the rear surface of the bracket 40 may be made to face each other so that the viscoelastic resin is supplied in a manner that the two are connected. Alternatively, the side surfaces of the pin 8 and the bracket 40 may be made to face each other so that the viscoelastic resin is supplied to the facing portions. Alternatively, the bracket 40 may be provided with a pin 8 that protrudes toward the base 60.

[0051] <Second Embodiment>

[0052] Next, a lens driving device 1A as a second embodiment of the present invention will be described. The lens driving device 1A includes a base 60A as a fixed portion, and an intermediate support body 40A and a bracket as a movable portion that moves relative to the fixed portion. Figure 4 as well as Figure 5 , only the base 60A and the intermediate support body 40A are shown, and illustration of other components is omitted. The bracket is supported by springs so that it can move relative to the intermediate support body 40A in the Z direction parallel to the optical axis direction, and is accommodated in the intermediate support body 40A. The intermediate support body 40A is a rectangular parallelepiped frame, and is supported by springs on the base 60A so that it can move relative to the base 60A together with the bracket in the X direction and the Y direction.

[0053] The intermediate support body 40A is formed by combining two plate portions 143 facing each other in the Z direction and two plate portions 146 facing each other in the X direction in a quadrilateral shape. A circular opening 141 is provided in the plate portion 143 on the +Z side. A quadrilateral opening 140 is provided in the center of the plate portion 144 on the -Z side. A recess 147 recessed toward the +Z side is provided on the +X side and the -X side of the opening 140 of the plate portion 144 facing the rear surface of the base 60A. The recess 147 is square-shaped. Viscoelastic resin is provided in the recess 147.

[0054] The base 60A includes a plate portion 165 extending in the X direction corresponding to the plate portion 144, a peripheral wall portion 166 protruding toward the -Z side from the peripheral edge of the rear surface of the -Z side of the plate portion 165, and a column portion 164 protruding toward the +Z side from the four corners of the front surface of the +Z side of the plate portion 165. A quadrilateral opening 161 is provided in the center of the plate portion 165. In addition, a metal pin 108 is provided at a position corresponding to the center of the recess 147 of the intermediate support body 40A on the front surface of the plate portion 165 facing the intermediate support body 40A. Figure 5 As shown, the pin 108 is in the shape of an elongated column. The pin 108 protrudes toward the side of the recess 147 along the Z direction, which is a direction orthogonal to the moving direction of the intermediate support body 40A. The front end of the pin 108 is located inside the viscoelastic resin in the recess 147. The image sensor 6 is mounted and fixed from the rear side of the base 60A.

[0055] When the intermediate support body 40A moves toward the +X side, the inner surface of the recessed portion 147 on the +X side moves away from the pin 108, and the inner surface on the -X side moves closer. When the intermediate support body 40A moves toward the -X side, the opposite action is performed. In addition, when the intermediate support body 40A moves toward the +Y side, the inner surface of the recessed portion 147 on the +Y side moves away from the pin 108, and the inner surface on the -Y side moves closer. When the intermediate support body 40A moves toward the -Y side, the opposite action is performed.

[0056] The above are details of the second embodiment. The lens driving device 1 of the second embodiment can also achieve the same effects as those of the first embodiment.

[0057] In this second embodiment, the surface on which the recess 147 is provided and the surface on which the pin 108 is provided may be opposite, and the recess 147 may be provided on the front surface of the base 60A, and the pin 108 protruding toward the recess 147 on the front surface of the base 60A may be provided on the rear surface of the intermediate support body 40A.

[0058] In the second embodiment, the recess 147 does not need to be square, but may be rectangular, triangular, circular, or other shapes. In addition, as in the first embodiment, the recess 147 may not be provided, but an open portion may be provided. In addition, although the example of two pins 8 is shown, three or more pins may be provided.

[0059] In the second embodiment, a pin protruding toward the other may be provided on one of the bracket and the intermediate support body 40A (not shown), and a resin having viscoelasticity may be provided so as to connect the other and the pin.

Claims

1. A lens driving device, characterized in that: have: a fixed portion; and a movable part having a holding part for holding the lens and moving relatively with respect to the fixed part, The fixed part and the movable part are opposite to each other, a pin is provided on one of the fixed part and the movable part and protrudes toward the other part, and a resin having viscoelasticity is provided in a manner connecting the other part and the pin. The other side is provided with a recessed portion, the recessed portion faces a side surface of the pin, and the pin protrudes in a direction parallel to a moving direction of the movable portion.

2. The lens driving device according to claim 1, characterized in that: The movable part has a bracket provided with a through hole as the holding part, The fixing portion includes a base for supporting the bracket so as to be freely movable toward the rear side. The recess is provided at the rear of the bracket, and the pin is provided at a rear side position of the recess on the front surface of the base.

3. The lens driving device according to claim 2, characterized in that: A coil is wound on the support. The recess is hollowed out at the front side and is open at the side, and the side open portion of the recess is covered by the coil.

4. A camera device, characterized in that: A lens driving device according to any one of claims 1 to 3 is provided.

5. An electronic device, characterized in that: A camera device according to claim 4.

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