TWI716531B - Optical unit with vibration correction function - Google Patents

Abstract

The present invention uses a support mechanism using a movable frame to support an optical unit with a vibration correction function for a movable body to reduce the amount of movement of the movable body caused by external impact.

The optical unit 1 with vibration correction function has: a movable body 10 that holds the optical module 2 by a holder 40; and a gimbal ring frame mechanism 30 that supports the movable body 10 to swing relative to the fixed body 20. The gimbal ring frame mechanism 30 includes a movable frame 60 as a gimbal spring. The movable frame 60 includes a fulcrum portion 61 and a connecting portion 62, and the connecting portion 62 includes a serpentine portion 63. The cross-sectional shape of the serpentine portion 63 is as follows: in the direction orthogonal to the first axis R1 and the second axis R2 as the first direction Q1, it is orthogonal to the first direction Q1 and is perpendicular to the serpentine portion 63 When the direction orthogonal to the serpentine path S is the second direction Q2, the thickness t2 in the second direction Q2 of a single leaf of the leaf spring constituting the movable frame 60 is greater than the thickness t0 in the first direction Q1 thereof.

Description

Optical unit with vibration correction function

The invention relates to an optical unit with a vibration correction function that uses a universal ring frame mechanism to support a movable body to be able to swing.

From the past, various optical units equipped with optical modules for shooting have been used. In order to suppress the disturbance of the captured image caused by hand shake and vibration, the optical unit is equipped with a vibration correction drive mechanism that swings the optical module to correct the vibration. In addition, the optical unit is provided with a gimbal ring frame mechanism arranged between the movable body and the fixed body as a support mechanism for supporting the movable body with the optical module mounted thereon to be able to swing with respect to the fixed body. Patent Document 1 discloses an optical unit with vibration correction function having such a universal ring frame mechanism.

[Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2015-64501

The gimbal ring frame mechanism of Patent Document 1 includes a rectangular frame-shaped gimbal spring (movable frame) and a swing support portion that supports the gimbal spring. One of the two sets of swing support parts set at the diagonal position of the universal spring is set on the fixed body, and the other set is set on the movable body. The universal spring is provided with a fulcrum part supported by the swing support part, and a serpentine part is provided at the connecting part connecting the fulcrum part and the fulcrum part.

Because the universal spring (movable frame) is provided with a meandering part, the universal spring not only has a plane direction Elasticity also has elasticity in the direction orthogonal to the plane direction. However, depending on the purpose of the optical unit with the vibration correction function, it is sometimes undesirable that the serpentine portion has too much elasticity. For example, there are cases where it is desired to reduce the amount of movement of the movable body when an external impact is applied. However, no universal spring with a shape corresponding to this expectation has been proposed.

In view of this problem, the subject of the present invention is to reduce the amount of movement of the movable body caused by external impact in an optical unit with a vibration correction function that uses a support mechanism using a movable frame to support a movable body.

In order to solve the above-mentioned problems, the optical unit with vibration correction function of the present invention has: a movable body and a fixed body; a support mechanism that supports the movable body to swing around a first axis and a second axis that cross each other; and vibration A correction drive mechanism that swings the movable body; the support mechanism includes a movable frame and a plurality of swing support parts supporting the movable frame, one part of the plurality of swing support parts is provided on the fixed body, and a part other than the part The movable frame is provided on the movable body, and the movable frame is a sheet-shaped spring or a laminated body in which a plurality of the sheet-shaped springs are stacked in a first direction orthogonal to the first axis and the second axis, the plate-shaped The spring includes a fulcrum portion contacting the swing support portion and a connecting portion connecting the fulcrum portion and the fulcrum portion, the connecting portion includes a serpentine portion or a curved portion located on an inner peripheral side of the fulcrum portion, the serpentine portion Or the thickness of a single sheet of the leaf spring of the bent portion in the second direction orthogonal to the first direction and perpendicular to the meandering path of the serpentine portion or the bent path of the bent portion is greater than the thickness of the first The thickness in 1 direction.

According to the present invention, the support mechanism for supporting the movable body to be able to swing is provided with a movable frame, the movable frame is a sheet-shaped spring or a laminated body formed by stacking a plurality of the above-mentioned sheet-shaped springs, and the plate-shaped spring is provided with a swing support part supported The fulcrum part and the serpentine part located on the inner peripheral side of the fulcrum part or 者flexion. Therefore, the movable frame has the elasticity in the plane direction including the plate spring, so it can prevent the damage of the device due to external impact. On the other hand, in the present invention, a shape that increases the rigidity of the serpentine portion or the curved portion is adopted. Specifically, the following shape is adopted: when the direction orthogonal to the first axis and the second axis is set as the first direction, the meandering path of the serpentine part or the curved path of the curved part is orthogonal to the first direction When the orthogonal direction is set as the second direction, the thickness in the second direction (thickness of the meandering part or curved part when viewed from the first direction) is greater than the thickness in the first direction (orthogonal to the plane including the leaf spring) The thickness in the direction) of the cross-sectional shape. Such a shape not only enables the serpentine portion or the curved portion to have elasticity in the plane direction, but also can appropriately improve the rigidity of the serpentine portion or the curved portion. Therefore, the amount of movement of the movable body due to external impact can be reduced.

In the present invention, it is preferable that the connecting portion includes the serpentine portion and a linear portion connecting the serpentine portion and the fulcrum portion, and the serpentine portion includes: a first curved portion that protrudes toward the outer peripheral side; 2 a curved portion that protrudes toward the inner peripheral side on one side of the first curved portion in the circumferential direction; and a third curved portion that protrudes toward the inner peripheral side on the other side of the circumferential direction of the first curved portion; and The second curved portion and the third curved portion are connected to the straight portion in a curved shape. In this way, the elasticity can be increased compared to a curved shape. In addition, since the number of windings is small, it is possible to suppress an excessive increase in elasticity. Therefore, damage to the device due to external impact can be prevented, and the amount of movement of the movable body due to external impact or the like can be reduced.

In the present invention, it is preferable that the thickness of the serpentine portion in the second direction is greater than the thickness of the straight portion in the second direction. In this way, the rigidity of the serpentine portion can be appropriately increased, and the arrangement space of the straight portion can be reduced. Therefore, the rigidity of the serpentine portion can be appropriately increased, and the overall size of the device can be reduced.

In the present invention, it is possible to adopt a configuration in which the movable frame is the laminated body, and a part or the whole of the plurality of plate springs is joined to the fulcrum portion. So even though When the thickness direction dimension of the plate spring cannot be freely set due to the manufacturing method of the plate spring, etc., the required cross-sectional shape can also be realized by laminating the plate spring. In addition, the rigidity can be improved by joining to the fulcrum part which is the part to which the load is applied.

In the present invention, it is preferable that the thickness in the second direction of the serpentine portion of each of the plurality of leaf springs is more than twice the thickness of the serpentine portion in the first direction. In this way, even when one plate spring is used, the rigidity of the meandering portion or the bent portion can be appropriately increased, and when two plate springs are used, the rigidity can be further improved.

For example, the following configuration can be adopted: when the plurality of plate springs include a first plate spring, a second plate spring, and a third plate spring stacked in the first direction, the first plate spring The second plate spring is joined to the fulcrum portion, and the third plate spring is joined to the second plate spring on both sides of the fulcrum portion in the circumferential direction. In this way, as long as the plate spring is joined to the fulcrum portion and its vicinity, it can be joined to the portion where the load is applied and its vicinity, and therefore the rigidity can be improved. In addition, by adding another plate spring to the movable frame in which the two plate springs are overlapped and joined to the fulcrum portion, and joined, the rigidity can be improved compared with the case of two plate springs.

In this case, it is preferable that the third plate spring includes a thin-walled portion joined to the second plate spring. In this way, when welding is performed by laser welding, even if welding is not performed with high output, the welding can be performed reliably.

In the present invention, it is preferable that the third plate spring includes an outer notch that cuts the outer periphery of the connecting portion to be closer to the first plate spring and the second plate spring. From the inside position. Furthermore, it is preferable that the third plate-shaped spring includes an inner notch portion that cuts off the outer periphery of the connecting portion to a position more outside than the first plate-shaped spring and the second plate-shaped spring Become. If such a cut is formed, you can When the movable frame tilts when the movable body swings, the third plate spring located at a position separated from the contact point of the movable frame and the swing support part is less likely to contact with surrounding parts.

In the present invention, it is preferable that the movable body includes an optical module and a wall portion located on the outer peripheral side of the optical module, the wall portion is provided at a plurality of positions separated in the circumferential direction, and the wall portion is fixed to the wall portion. In the coil of the drive mechanism for vibration correction, the serpentine portion or the curved portion of the movable frame is located on the inner peripheral side of the wall portion, and the fulcrum portion is arranged between the wall portions adjacent in the circumferential direction. In this way, when the serpentine portion or the curved portion passes through the inner peripheral side of the wall portion for fixing the coil, and the fulcrum portion is arranged between the adjacent wall portions in the circumferential direction, the movable frame is a serpentine portion or a curved portion The shape is recessed toward the inner circumference. Therefore, the wall portion and the coil can be arranged on the inner peripheral side. In addition, it is not necessary to ensure a space for disposing the wall portion on the outer peripheral side of the fulcrum. Therefore, the entire device can be miniaturized.

According to the present invention, the support mechanism for supporting the movable body to be able to swing includes a movable frame. The movable frame is a plate spring or a plurality of the plate springs along a first axis orthogonal to the first axis and the second axis. In the laminated body formed by overlapping directions, the plate-shaped spring includes a serpentine portion or a curved portion between the fulcrum portion and the fulcrum portion. In addition, the serpentine portion or the curved portion shall be the first direction orthogonal to the first axis and the second axis, and shall be orthogonal to the first direction and be perpendicular to the meandering path of the serpentine portion or the curved path of the curved portion When the orthogonal direction is set as the second direction, the thickness of the second direction of a single leaf spring (the thickness of the meandering or curved portion when viewed from the first direction) is greater than the thickness of the first direction (and the thickness of the plate The thickness of the direction perpendicular to the plane of the spring). With such a cross-sectional shape, the serpentine portion or the curved portion can have elasticity in the plane direction, and the rigidity of the serpentine portion or the curved portion can be appropriately increased. Therefore, it is possible to prevent damage to the device due to an external impact, and it is possible to suppress an excessive increase in the amount of movement of the movable body due to an external impact.

1: Optical unit with vibration correction function

2: Optical module

2A: Upper module

4: lens holder

10: movable body

11: counterweight

20: fixed body

30: Universal ring frame mechanism

31: 1st contact spring holding part

32: 2nd contact spring holding part

33: The first contact spring

34: 2nd contact spring

35: Contact

36: The first swing support part

37: The second swing support part

38: Sphere

40: retainer

41: Frame

42: Keep hole

44: Wall

45: Coil holding part

46: Notch

48: Fixing convex part

49: Restricted Department

50: Drive mechanism for vibration correction

51: Magnetic drive mechanism

52: Magnet

53: Coil

60: movable frame

60A: The first plate spring

60B: 2nd plate spring

60C: 3rd plate spring

61, 61A, 61B, 61C: fulcrum

62, 62A, 62B, 62C: connecting part

63, 63A, 63B, 63C: meandering part

64A, 64B, 64C: Thin-walled part

65A, 65B, 65C: Notch

66: straight part

67, 67A, 67B, 67C: Outside cut

68C: Inside cut

70: Spring parts

71: Fixed body side connection part

72: Movable body side connection part

73: Arm

75: recess

80: Flexible wiring board

81: rectangular frame part

82: Winding part

210: first shell

211: Body

212: End plate

214: Window

216: Side Board

250: second shell

251: Part 1

252: Part 2

254, 255: side wall

631: first bend

632: second bend

633: third bend

L: Optical axis

Q1: First direction

Q2: Second direction

R1: 1st axis

R2: 2nd axis

S: winding path

t0: The thickness in the first direction of a single sheet of the plate spring

t1: The thickness of the first direction of the whole laminate

t2: thickness in the second direction

Figure 1 (a) and (b) are perspective views of the optical unit with vibration correction function to which the present invention is applied, viewed from the object side and the image side.

Fig. 2 is an exploded perspective view of the optical unit with vibration correction function of Fig. 1 viewed from the object side.

FIG. 3 is a cross-sectional perspective view of the optical unit with vibration correction function of FIG. 1. FIG.

4(a) and (b) are a plan view of the optical unit with vibration correction function after the first housing and the optical module are disassembled, and a partial cross-sectional view of the swing support part.

Figure 5 (a) and (b) are a perspective view and a cross-sectional perspective view of the movable frame.

Figure 6 is an exploded perspective view of the movable frame.

(Overall composition)

Hereinafter, an embodiment of the optical unit 1 with vibration correction function to which the present invention is applied will be described with reference to the drawings. In this specification, the three axes of XYZ are orthogonal to each other. One side of the X-axis direction is represented by +X, the other side is represented by -X, and one side of the Y-axis direction is represented by +Y. The other side is represented by -Y, one side in the Z-axis direction is represented by +Z, and the other side is represented by -Z. The Z-axis direction is a direction along the optical axis L of the optical module 2 mounted on the movable body 10 when the movable body 10 of the optical unit 1 with vibration correction function is not swinging. In addition, the -Z direction is the image side in the optical axis L direction, and the +Z direction is the object side (subject side) in the optical axis L direction.

Fig. 1(a) is a perspective view of the optical unit 1 with vibration correction function viewed from the object side, and Fig. 1(b) is a perspective view viewed from the image side. Fig. 2 is an exploded perspective view of the optical unit 1 with vibration correction function viewed from the object side. Fig. 3 is a cut-away perspective view of the optical unit 1 with vibration correction function, and is a cut-away perspective view of A-A in Fig. 1(a). Optical unit 1 with vibration correction function such as It is used as an optical device such as a mobile phone with a camera, a driving recorder, etc., or an optical device such as a sports camera or a wearable camera mounted on a helmet, a bicycle, a remote control helicopter, etc. In this kind of optical machine, in order to avoid the disturbance of the captured image caused by vibration during shooting, the optical unit 1 with a vibration correction function is driven to correct the vibration.

The optical unit 1 with a vibration correction function includes: a movable body 10; a fixed body 20; a gimbal ring frame mechanism 30 as a support mechanism that supports the movable body 10 to swing relative to the fixed body 20; and a drive mechanism for vibration correction 50, which generates a magnetic driving force for relative displacement of the movable body 10 with respect to the fixed body 20; a spring member 70 which connects the movable body 10 and the fixed body 20; and a flexible wiring board 80. The optical unit 1 with the vibration correction function supplies power to the vibration correction drive mechanism 50 via the flexible wiring board 80. The control device installed on the upper side of the main body of the optical device equipped with the optical unit 1 with the vibration correction function drives the drive mechanism for vibration correction based on the output of the gyroscope (vibration detection sensor) that detects vibration when the optical device vibrates 50. Swing the movable body 10 to perform vibration correction.

The movable body 10 is supported by the gimbal ring frame mechanism 30 so as to be able to swing around a first axis R1 crossing the optical axis L, and can swing around a second axis R2 crossing the optical axis L and the first axis R1. The first axis R1 and the second axis R2 are diagonal directions of the fixed body 20 and are orthogonal to the optical axis L. In addition, the first axis R1 and the second axis R2 are orthogonal to each other.

(Fixed body)

The fixed body 20 includes a first housing 210 having a substantially square outer shape when viewed from the Z-axis direction, and a second housing 250 assembled from the −Z direction side with respect to the first housing 210. The first housing 210 is fixed to the second housing 250 by welding or the like. The first housing 210 includes a square cylindrical main body 211 surrounding the periphery of the movable body 10 and a rectangular frame-shaped end plate 212 that bulges inward from an end of the main body 211 in the +Z direction. A window 214 is formed in the center of the end plate portion 212. The main body 211 is provided in the +X direction The side plate portions 216 of each of the side, the -X direction side, the +Y direction side, and the -Y direction side.

The second housing 250 is composed of two members of a rectangular frame-shaped first member 251 and a rectangular frame-shaped second member 252 attached to the +Z direction side of the first member 251. A spring member 70 connecting the movable body 10 and the fixed body 20 is attached to the inner peripheral side of the second housing 250. The second member 252 includes side wall portions 254 and 255 that stand up from a diagonal position on the first axis R1 toward the +Z direction. The side wall portions 254 and 255 are formed with a first contact spring holding portion 31 constituting the first swing support portion 36 of the universal ring frame mechanism 30.

(Movable body)

The movable body 10 includes: an optical module 2; a holder 40 holding the optical module 2; a weight 11 fixed to the end of the optical module 2 on the +Z direction side; and a holder 40 installed in the -Z direction A frame-shaped stopper 49 at the end. When the movable body 10 swings, the restricting portion 49 abuts on the inner peripheral surface of the second housing 250 of the fixed body 20 to limit the swing range of the movable body 10. As shown in FIG. 3, the optical module 2 includes a cylindrical upper module 2A that holds a lens unit as an optical element. The cylindrical lens holder 4 protrudes from the end on the +Z direction side of the upper module 2A. The weight 11 is formed of a non-magnetic metal, and is attached so as to surround the outer peripheral side of the lens holder 4 and the +Z direction side.

The holder 40 includes a frame 41 whose planar shape when viewed from the Z-axis direction is substantially square. A circular holding hole 42 for arranging the optical module 2 is formed in the center of the frame 41 (refer to FIG. 3). The frame portion 41 is provided with a wall portion 44 that rises in the +Z direction at four locations surrounding the outer periphery of the holding hole 42. The wall portion 44 extends linearly in the X-axis direction or the Y-axis direction at the center of each side edge of the frame portion 41. The wall portions 44 at the four locations are each provided with a coil holding portion 45 formed on an outer surface facing the side opposite to the holding hole 42. The coil holding portion 45 is a rectangular convex portion, and the coil 53 of the magnetic drive mechanism 51 is mounted. As shown in FIG. 3, the coil holding portion 45 protrudes from the center of the coil 53 toward the magnet 52 side and faces the magnet 52. Because the movable body 10 is along the X axis due to vibration, etc. When it is displaced in the direction or the Y-axis direction, the coil holding portion 45 abuts the magnet 52 to restrict the range of movement of the movable body 10.

A flexible wiring board 80 for supplying power to the coil 53 is mounted on the frame 41. The flexible wiring board 80 includes: a frame portion 81 extending along the inner circumference of the wall 44 at four locations; and a strip shape extending from the inner periphery of the rectangular frame portion 81 through the holding hole 42 and drawn in the -Z direction之引圈部82.

A notch 46 (refer to FIG. 2) is provided at a diagonal position on the first axis R1 of the frame 41, and the notch 46 is formed by being cut off by a plane perpendicular to the first axis R1. When the movable body 10 is assembled to the fixed body 20, the side wall portions 254 and 255 provided at the diagonal positions on the first axis R1 of the second housing 250 are arranged in the cutout portion 46. Therefore, the first contact spring holding portion 31 provided on the side wall portions 254 and 255 is arranged at a diagonal position on the first axis R1 of the frame portion 41. In addition, a second contact spring holding portion 32 constituting the second swing support portion 37 of the gimbal ring frame mechanism 30 is formed at a diagonal position on the second axis R2 of the frame portion 41.

A fixing convex portion 48 is formed in the center of each surface of the outer peripheral surface of the frame 41 on the -Z direction side toward the +X direction side, -X direction side, +Y direction side, and -Y direction side (refer to figure 2). The fixing convex portion 48 extends linearly in the Z-axis direction and functions as an engaging portion for engaging the spring member 70. In addition, a restricting portion 49 is attached to the end of the frame portion 41 in the -Z direction.

(Spring parts)

The spring member 70 is arranged at the end of the fixed body 20 in the -Z direction, and connects the fixed body 20 and the movable body 10. The posture of the movable body 10 when it is in a static state where the vibration correction drive mechanism 50 is not driven is defined by the spring member 70. As shown in FIG. 2, the spring member 70 is a rectangular frame-shaped leaf spring formed by processing a metal plate. The spring member 70 is connected to the fixed body 20 by being fixed to the first member 251 of the second housing 250 by a connecting portion 71 provided on the fixed body side of the outer peripheral portion thereof. Also, Yu Chun The inner periphery of the member 70 is provided with a frame-shaped movable body side connecting portion 72, and the movable body side connecting portion 72 is connected to the fixed body side connecting portion by an arm portion 73. When the movable body 10 is assembled to the fixed body 20, the concave portion 75 provided on the movable body side connecting portion 72 engages with the fixing convex portion 48 provided on the outer peripheral surface of the movable body 10. By fixing the engagement site with an adhesive, the spring member 70 is connected to the movable body 10.

(Drive mechanism for vibration correction)

4(a) is a plan view of the optical unit with vibration correction function after the first housing 210 and the optical module 2 are removed, and FIG. 4(b) is a partial cross-sectional view of the second swing support part 37 (FIG. 4( a) BB section view). The driving mechanism 50 for vibration correction includes four sets of magnetic driving mechanisms 51 provided between the fixed body 20 and the movable body 10. Each magnetic drive mechanism 51 includes a magnet 52 and a coil 53. The coil 53 is an air-core coil, and is held on the +X direction side and the −X direction side of the movable body 10 and the +Y direction side and the −Y direction side of the movable body 10. The magnet 52 is held in the main body portion 211 of the first housing 210 in the side plate portion 216 (refer to FIG. 2) located in each of the +X direction side, the -X direction side, the +Y direction side, and the -Y direction side. surface. Therefore, between the movable body 10 and the main body 211 of the first housing 210, the magnet 52 and the coil 53 are either on the +X direction side, -X direction side, +Y direction side, and -Y direction side. All face to face.

The outer surface of the magnet 52 connected to the main body 211 and the inner surface facing the coil 53 are magnetized into different magnetic poles. In addition, the magnet 52 is divided into two parts in the direction of the optical axis L (ie, the direction of the Z axis), and magnetized in such a way that the magnetic poles on the inner surface side differ with the dividing position as the boundary. Therefore, the coil 53 uses the upper and lower long sides as effective sides. The patterns on the outer surface side and the inner surface side of the 4 magnets are the same. The first housing 210 is made of a magnetic material, and functions as a yoke for the magnet 52.

As shown in Fig. 4(a), the two sets of magnetic drive mechanism 51 composed of two sets of magnets 52 and coils 53 located on the +Y direction side and the -Y direction side of the movable body 10 generate the same around the X axis when energized direction The magnetic driving force is used for wiring connection. In addition, the two sets of magnetic drive mechanism 51 composed of two sets of magnets 52 and coils 53 located on the +X direction side and the -X direction side of the movable body 10 generate a magnetic drive force in the same direction around the Y axis when energized Make wiring connections. Therefore, the driving force generated by energizing the two sets of magnetic drive mechanism 51 composed of the two sets of magnets 52 and coils 53 located on the +Y direction side and the -Y direction side and the direction of the drive force generated by the two sets located on the +X direction side and the -X direction The resultant force of the magnetic driving force generated by the energization of the two magnetic driving mechanisms 51 formed by the two sets of magnets 52 and coils 53 on the side causes the movable body 10 to swing around the first axis R1 and the second axis R2. Thereby, the movable body 10 swings in a direction opposite to the swing around the first axis R1 and swings in a direction opposite to the swing around the second axis R2, and the vibration in the pitch and roll directions is corrected.

(Universal ring frame mechanism)

The gimbal ring frame mechanism 30 is configured between the second housing 250 and the holder 40. The gimbal frame mechanism 30 is provided with a first swing support portion 36 that is arranged at two locations separated in the direction of the first axis R1 when the movable body 10 is assembled to the fixed body 20; and is arranged to be separated in the direction of the second axis R2 The two second swing support portions 37; and the movable frame 60 supported by the first swing support portion 36 and the second swing support portion 37.

5(a) is a perspective view of the movable frame 60, and FIG. 5(b) is a sectional perspective view of the movable frame 60. The movable frame 60 is a universal spring having a substantially rectangular shape. The movable frame 60 includes fulcrum portions 61 provided at four locations around the optical axis L, and a connecting portion 62 connecting adjacent fulcrum portions 61 around the optical axis L. A metal ball 38 is fixed to the inner surface of each fulcrum portion 61 by welding or the like. The sphere 38 is provided with a hemispherical convex surface facing the center of the movable frame 60 at each fulcrum portion 61. The connecting portion 62 includes a serpentine portion 63 extending in the X-axis direction or the Y-axis direction, and can be elastically deformed in a direction orthogonal to the optical axis L.

The first swing support portion 36 includes a first contact spring holding portion 31 provided on the second housing 250 of the fixed body 20 and a first contact spring 33 held by the first contact spring holding portion 31. 1st connection The point spring 33 is a U-shaped curved metal leaf spring. The first swing support portion 36 is arranged on the inner peripheral side of the fulcrum portion 61 provided at a diagonal position in the direction of the first axis R1, and is installed via a first contact spring 33 that can be elastically deformed in the direction of the first axis R1 Support the movable frame 60.

The second swing support portion 37 includes a second contact spring holding portion 32 provided on the holder 40 of the movable body 10 and a second contact spring 34 held by the second contact spring holding portion 32. As shown in FIG. 4(b), the second contact spring 34 is a metal plate spring bent in a U-shape, and has the same shape as the first contact spring 33. The second swing support portion 37 supports the movable frame 60 by a second contact spring 34 attached in a state capable of being elastically deformed in the direction of the second axis R2.

The first contact spring 33 of the first swing support portion 36 and the second contact spring 34 of the second swing support portion 37 each have a hemispherical contact portion 35 (refer to the figure) which is in contact with the ball 38 welded to the fulcrum portion 61 4(b)). The movable frame 60 is formed by point contact with the sphere 38 and the hemispherical contact portion 35 of the first contact spring 33 and the second contact spring 34 that are engaged with the fulcrum portions 61 provided at 4 locations around the optical axis L. Is supported. Therefore, the movable frame 60 is supported in a state of being rotatable in each of two directions (the first axis R1 direction and the second axis R2 direction) orthogonal to the optical axis L direction.

(Movable frame)

The movable frame 60 is a laminate formed by laminating the first plate spring 60A, the second plate spring 60B, and the third plate spring 60C along the optical axis L direction (Z axis direction), and is joined by laser welding . The three plate springs are frame-shaped plate springs with the optical axis L as the plate thickness direction, and the plate thicknesses are the same. The first plate spring 60A and the second plate spring 60B are joined at the fulcrum portion 61, and the ball 38 is joined at the joining portion of the first plate spring 60A and the second plate spring 60B. In addition, the third plate spring 60C is joined to the second plate spring 62B on both sides of the fulcrum portion 61 in the circumferential direction. The first plate spring 6A, the second plate spring 60B, and the third plate spring 60C are formed by etching. Furthermore, these parts can also be formed by stamping.

FIG. 6 is an exploded perspective view of the movable frame 60. FIG. As shown in FIGS. 5 and 6, the first plate spring 60A is provided with fulcrum parts 61A joined to the sphere 38 at four locations, and a meandering portion 62A connecting the fulcrum parts 61A adjacent to the optical axis L is formed部63A. A semicircular thin wall portion 64A is formed at the center of the fulcrum portion 61A in the circumferential direction, and a semicircular cutout portion 65A is formed at the center of the thin wall portion 64A. The thin-walled portion 64A and the cut-out portion 65A are provided on the inner peripheral edge of the fulcrum portion 61A. Similarly, the second plate spring 60B has fulcrum portions 61B joined to the sphere 38 at four locations, and a serpentine portion 63B is formed in the connecting portion 62B connecting the fulcrum portions 61B adjacent to the optical axis L. A semicircular thin wall portion 64B and a semicircular cutout portion 65B located in the center of the thin wall portion 64B are formed on the fulcrum portion 61B.

As shown in FIG. 5(b), in the fulcrum portion 61, the thin-walled portions 64A and 64B abut in the Z-axis direction (optical axis L direction). The thin-walled portions 64A and 64B are joined by laser welding, whereby the first plate spring 60A and the second plate spring 60B are joined at four places. When the thin-walled parts 64A and 64B are joined by laser welding, the ball 38 is simultaneously welded to the end surfaces on the inner peripheral side of the thin-walled parts 64A and 64B.

The third plate spring 60C has four fulcrum portions 61C overlapping the fulcrum portions 61B of the second plate spring 60B, and a serpentine portion is formed in the connecting portion 62C connecting the fulcrum portions 61C adjacent to the optical axis L 63C. Thin-walled portions 64C are formed on both sides in the circumferential direction of each fulcrum portion 61C, and a cutout portion 65C is formed in the center of the thin-walled portion 64C. The thin portion 64C and the cutout portion 65C are located on the outer periphery of the corner connecting the fulcrum portion 61C and the connecting portion 62C. The thin portion 64C of the third plate spring 60C is welded to the second plate spring 60B by laser welding.

As shown in Figure 5(a), in the movable frame 60 as a laminate of plate springs, the central portion of the connecting portion 62 connecting the fulcrum portion 61 and the fulcrum portion 61 is formed as a serpentine portion 63, and the serpentine portion The portion 63 connected to the fulcrum portion 61 is a straight portion 66 extending parallel to the radial direction. The serpentine portion 63 is located on the inner peripheral side of the fulcrum portion 61. The serpentine portion 63 includes: a first curved portion protruding toward the outer peripheral side 631; a second curved portion 632 protruding toward the inner periphery on one side of the first curved portion 631 in the circumferential direction; and a third curved portion 633 protruding toward the inner periphery on the other side of the first curved portion 631 in the circumferential direction. The second curved portion 632 and the third curved portion 633 are connected to the straight portion 66 in a curved shape.

The gimbal ring frame mechanism 30 supports the movable body 10 so as to be swingable relative to the fixed body 20, and the movable body 10 is supported so as to be able to pass around the first axis R1 of a pair of fulcrum portions 61 provided at one of the diagonal positions of the movable frame 60 And two axes that are orthogonal to the first axis R1 and pass through the second axis R2 of the other pair of fulcrum parts 61 swing. Here, assuming that the direction orthogonal to the first axis R1 and the second axis R2 is the first direction Q1 (see FIG. 5(a)), the first direction Q1 is orthogonal to the meandering portion 63 When the direction orthogonal to the serpentine path S (see FIG. 5(b)) is set to the second direction Q2 (see FIG. 5(b)), the first direction Q1 is a direction orthogonal to the plane including the movable frame 60. In addition, the second direction Q2 is the member width (thickness) direction of the serpentine portion 63 when viewed from the first direction Q1. In the state where the movable body 10 is not swinging, the first direction Q1 coincides with the optical axis L direction, that is, the Z axis direction.

The width (thickness) of the connecting portion 62 of the movable frame 60 when viewed from the first direction Q1 (that is, the optical axis L direction) is not fixed, but the thickness of the serpentine portion 63 is formed thicker than that of the straight portion 66 Degree rough. That is, on the outer peripheral edge of the straight portion 66, an outer cut portion 67 is formed by cutting to the inner peripheral side at a fixed depth. Therefore, the straight portion 66 is thinner than the serpentine portion 63 and corresponds to the amount of cut of the outer cut portion 67. By increasing the thickness of the member of the serpentine portion 63, the serpentine portion 63 can be made to have an appropriate rigidity, and it is possible to suppress an excessive increase in elasticity. The serpentine portion 63 has a shape in which the first curved portion 631, the second curved portion 632, and the third curved portion 633 are connected. However, regardless of the position of the three curved portions, the width (thickness) of the part when viewed from the first direction Q1 Degree) are the same.

The serpentine portion 63A, serpentine portion 63B, and serpentine portion 63C of each plate spring have the following cross-sectional shape: the thickness t2 of a single sheet of each plate spring in the second direction Q2 (refer to FIG. 5(b)) is greater than this The thickness t0 in the first direction Q1 (see FIG. 5(b)). Furthermore, it is preferable that the serpentine part 63A and the serpentine part The thickness t2 in the second direction Q2 of each of 63B and the serpentine portion 63C is more than twice the thickness t0 in the first direction Q1. Furthermore, as described above, the movable frame 60 is a laminate of three plate springs, so the thickness t1 of the entire laminate in the first direction Q1 is thicker than the thickness t2 in the second direction Q2. Since the thickness t1 in the first direction Q1 of the entire laminate is thicker than the thickness t2 in the second direction Q2, the rigidity of the serpentine portion 63 can be further improved. Therefore, it is possible to further reduce the amount of movement of the movable body due to an external impact.

As shown in Figures 3 and 4(a), if the movable frame 60 is assembled to the first swing support portion 36 and the second swing support portion 37, the serpentine portion 63 passes through the upper module 2A of the optical module 2 (Refer to Figure 3) and the wall 44. In addition, the fulcrum portion 61 is located at an angular position between the wall portions 44 adjacent in the circumferential direction, and the fulcrum portion 61 is located on the outer peripheral side of the wall portion 44 and the coil 53. In this way, the portion of the movable frame 60 forming the serpentine portion 63 has a planar shape recessed toward the inner peripheral side. In addition, a space for arranging the fulcrum portion 61 is ensured between the wall portions 44 of the holder 40 adjacent in the circumferential direction. Therefore, the wall 44 and the coil 53 can be arranged on the inner peripheral side, and the magnet 52 facing the coil 53 can also be arranged on the inner peripheral side. Therefore, the entire device can be downsized in the direction orthogonal to the optical axis L.

As described above, in the movable frame 60, in order to form the straight portion 66 connecting the serpentine portion 63 and the fulcrum portion 61 to be thinner than the serpentine portion 63, an outer cut portion 67 is provided on the outer periphery of the straight portion 66. Thereby, the arrangement space of the wall portion 44 and the coil 53 provided on the outer peripheral side of the serpentine portion 63 is enlarged by an amount equivalent to the area cut off by the outer cut portion 67. Therefore, the length of the X-axis direction or the Y-axis direction of the wall part 44 can be extended, and the coil 53 can be enlarged. Alternatively, the entire device can be downsized without increasing the wall portion 44 and the coil 53 in size.

As shown in FIG. 5(a), the outer cut portion 67 is provided in the outer cut portion 67A of the first plate spring 60A, the outer cut portion 67B is provided in the second plate spring 60B, and the third plate spring 60C The portion where the outer cutout portion 67C overlaps. Here, the outer cutout portions 67A and 67B are the same The shape, but the outer cut portion 67C is cut out one more turn than the outer cut portions 67A, 67B. That is, the third plate spring 60C includes an outer cutout portion 67C by cutting the outer periphery of the straight portion 66 to a position more inside than the first plate spring 60A and the second plate spring 60B Become. In addition, the third plate spring 60C is provided with an inner cut portion 68C by cutting the inner periphery of the straight portion 66 to a position on the outside of the first plate spring 60A and the second plate spring 60B Become.

The movable frame 60 is provided with a third plate at a position farthest away in the optical axis L direction from the ball 38 welded to the fulcrum portion 61 (ie, the contact point with the first swing support portion 36 and the second swing support portion 37) Therefore, when the movable body 10 swings and the movable frame 60 inclines, the movement amount of the third plate spring 60C is larger than that of the first plate spring 60A and the second plate spring 60B. Therefore, by cutting off the outer periphery and inner periphery of the third plate spring 60C more than the first plate spring 60A and the second plate spring 60B (providing an outer cut portion 67C and an inner cut portion 78C), the movable When the movable frame 60 is tilted when the body 10 swings, the possibility of the movable frame 60 coming into contact with surrounding parts (for example, the coil 53, the wall 44) is reduced.

(Main functions and effects of this embodiment)

As described above, in the optical unit 1 with a vibration correction function of the present embodiment, the movable frame 60 of the gimbal frame mechanism 30 as a support mechanism that supports the movable body 10 as a swingable support mechanism includes the serpentine portion 63. The serpentine portion 63 is located on the inner peripheral side of the fulcrum portion 61 supported by the first swing support portion 36 and the second swing support portion 37. Furthermore, as the cross-sectional shape of the meandering portions (snaking portions 63A, 63B, 63C) of the first plate spring 60A, the second plate spring 60B, and the third plate spring 60C constituting the movable frame 60, the following cross-sectional shapes are adopted : The direction orthogonal to the first axis R1 and the second axis R2 is set as the first direction Q1, and the direction orthogonal to the first direction Q1 and orthogonal to the meandering path S of the serpentine portion 63 is set as the first In the 2 direction Q2, the second direction of a single sheet of each leaf spring The thickness t2 of Q2 is greater than the thickness t0 of the first direction Q1. Therefore, the serpentine portion 63 can have elasticity in the plane direction, and the rigidity of the serpentine portion 63 can be appropriately increased. Therefore, the amount of movement of the movable body 10 due to an external impact can be reduced.

In the present embodiment, the serpentine portion 63 includes three curved portions, and is connected to the straight portion 66 in a curved shape. In this way, if the number of windings is reduced, the winding portion 63 can be made thick even if there is a space restriction. In addition, it is possible to increase the elasticity compared to a curved shape, and it is possible to suppress an excessive increase in the elasticity. Therefore, the amount of movement of the movable body when an external impact is applied can be reduced.

In this embodiment, the thickness of the serpentine portion 63 in the second direction Q2 is greater than the thickness of the straight portion 66 in the second direction Q2. In this way, the rigidity of the serpentine portion 63 can be ensured, and the arrangement space of the straight portion 66 can be reduced. Therefore, the amount of movement of the movable body when an external impact is applied can be reduced, and the overall size of the device can be reduced.

In this embodiment, the movable frame 60 is provided with a plurality of plate springs (a first plate spring 60A, a second plate spring 60B, and a third plate spring 60C) stacked in the first direction Q1, that is, in the direction of the optical axis L. ), two of the plurality of plate springs (the first plate spring 60A and the second plate spring 60B) are joined at the fulcrum portion 61, and the other plate spring (the third plate spring 60C ) Engage with the second plate spring 60B on both sides of the fulcrum portion 61 in the circumferential direction. In this embodiment, the first plate-shaped spring 60A, the second plate-shaped spring 60B, and the third plate-shaped spring 60C are manufactured by etching. Therefore, it is impossible to increase the size in the first direction regardless of the width (thickness). Thickness t0 (plate thickness), but the required cross-sectional shape can be realized by laminating multiple plate springs.

In the present embodiment, since the first plate spring 60A, the second plate spring 60B, and the third plate spring 60C are joined at the fulcrum portion 61 and its vicinity, the joining is performed in the vicinity of the portion where the load is applied. Therefore, the rigidity of the movable frame 60 can be improved. Specifically, laser welding is used to connect the overlapping portions of the thin portions 64A and 64B of the first plate spring 60A and the second plate spring 60B. Close, the thin-walled portion 64C of the third plate spring 60C is joined to the second plate spring 60B by laser welding on both sides of the fulcrum 61 in the circumferential direction. In this way, by laser welding the thin-walled part, it is possible to surely join even if welding is not performed with high output.

In this method, the third plate-shaped spring 60C provided at the outer side notch 67C farthest from the sphere 38 welded to the fulcrum portion 61 in the optical axis L direction is larger than the other plate-shaped spring outer side notch 67A , 67B. In addition, the third plate-shaped spring 60C is provided with an inner cutout portion 68C. Therefore, even when the movable body 10 swings and the movable frame 60 inclines, the third plate spring 60C moves more than other plate springs, and the third plate spring 60C comes into contact with surrounding parts (for example, the coil 53, the wall 44) The possibility is also reduced.

(Variation example)

(1) In the above embodiment, as the movable frame 60, a laminate in which three plate-shaped springs are laminated and joined is used, but the number of plate-shaped springs may be one. In this case, a flat spring with a thickness t2 in the second direction Q2 of the meandering portion greater than the thickness t0 in the first direction Q1 is used, but it is more desirable to set the thickness t2 in the second direction Q2 to the first direction Q1 The thickness t0 is more than 2 times. As a result, the rigidity can be improved even when a plate spring is used. In addition, the number of plate springs may be two, or a plate shape with the thickness t2 of the meandering portion in the second direction Q2 being twice or more than the thickness t0 of the first direction Q1 of a single plate spring A plate-shaped spring formed by joining two spring layers. The rigidity can be improved by increasing the number of leaf springs. Or the number of leaf springs may be 4 or more. In addition, when a plurality of plate springs are laminated, the plate thickness may be different.

(2) In the above embodiment, as the shape of the serpentine portion 63, a shape that is bent three times is adopted, but the shape of the serpentine portion 63 may be changed to a curved portion that is bent only once toward the inner peripheral side of the movable frame . In this case, as the cross-sectional shape of the curved portion, the following cross-sectional shape may be adopted: the direction orthogonal to the first direction Q1 and orthogonal to the curved path of the curved portion is set to the second direction Q2, and the plate The thickness t2 in the second direction Q2 of a single sheet of the spring is greater than the thickness t0 in the first direction Q1.

38: Sphere

60: movable frame

60A: The first plate spring

60B: 2nd plate spring

60C: 3rd plate spring

61, 61A, 61B, 61C: fulcrum

62: Connection

63, 63A, 63B, 63C: meandering part

64A, 64B, 64C: Thin-walled part

65A, 65B, 65C: Notch

66: straight part

67, 67A, 67B, 67C: Outside cut

68C: Inside cut

631: first bend

632: second bend

633: third bend

t0: The thickness in the first direction of a single sheet of the plate spring

t1: The thickness of the first direction of the whole laminate

t2: thickness in the second direction

Claims (12)

An optical unit with a vibration correction function, which is characterized by having: a movable body and a fixed body; a support mechanism that supports the movable body so as to be able to swing around a first axis and a second axis that cross each other; and a drive for vibration correction A mechanism that swings the movable body; and the support mechanism includes a movable frame and a plurality of swing support parts supporting the movable frame, one part of the plurality of swing support parts is provided on the fixed body, and a part other than the part is provided In the movable body, the movable frame is a sheet-shaped spring or a laminated body formed by stacking a plurality of the sheet-shaped springs in a first direction orthogonal to the first axis and the second axis, the plate spring It is provided with a fulcrum portion in contact with the swing support portion and a connecting portion connecting the fulcrum portion and the fulcrum portion, the connecting portion is provided with a serpentine portion or a curved portion located on an inner peripheral side of the fulcrum portion, the serpentine portion or The curved portion is a single sheet of the plate spring whose thickness in the second direction orthogonal to the first direction and perpendicular to the meandering path of the serpentine portion or the curved path of the curved portion is greater than the thickness of the first The thickness of the direction; the connecting portion includes the serpentine portion and the straight portion connecting the serpentine portion and the fulcrum portion, the serpentine portion includes: a first curved portion that protrudes toward the outer peripheral side; a second curved portion, which On one side of the first curved portion in the circumferential direction, it protrudes toward the inner circumferential side; and the third curved portion on the upper The other side of the first curved portion in the circumferential direction protrudes toward the inner circumferential side; and the second curved portion and the third curved portion are connected to the straight portion; the thickness of the serpentine portion in the second direction is greater than the straight portion The thickness of the part in the second direction. The optical unit with vibration correction function of claim 1, wherein the movable frame is the laminated body, and a part or the whole of the plurality of plate springs is joined to the fulcrum portion. The optical unit with vibration correction function of claim 2, wherein the thickness in the second direction of the serpentine portion of each of the plurality of plate springs is 2 of the thickness in the first direction of the serpentine portion Times more. The optical unit with vibration correction function of claim 2, wherein the plurality of plate springs include a first plate spring, a second plate spring, and a third plate spring that overlap in the first direction. A plate spring and the second plate spring are joined to the fulcrum portion, and the third plate spring is joined to the second plate spring on both sides of the fulcrum portion in the circumferential direction. The optical unit with vibration correction function according to claim 4, wherein the third plate spring includes a thin-walled portion joined with the second plate spring. For example, the optical unit with vibration correction function of claim 5, wherein the third plate spring is provided with an outer notch that cuts off the outer periphery of the connecting portion to be smaller than the first plate spring and the second The plate spring is more on the inner side. For example, the optical unit with vibration correction function of claim 6, wherein the third plate spring is provided with an inner notch, and the inner notch cuts off the inner peripheral edge of the connecting portion to be smaller than the first plate spring and the first 2The plate spring is made from the position on the outside. For example, the optical unit with vibration correction function of claim 7, wherein the movable body has an optical module and a wall portion located on the outer peripheral side of the optical module, and the wall portion is provided at a plurality of positions separated in the circumferential direction. The wall portion is fixed with the coil of the drive mechanism for vibration correction, the serpentine portion or the curved portion of the movable frame is located on the inner peripheral side of the wall portion, and the fulcrum portion is arranged between the wall portions adjacent in the circumferential direction between. For example, the optical unit with vibration correction function of claim 4, wherein the third plate spring is provided with an outer notch, and the outer notch cuts off the outer periphery of the connecting portion to be smaller than the first plate spring and the first 2The plate spring is made from the inner side. Such as the optical unit with vibration correction function of claim 4, where The third plate-shaped spring includes an inner notch that is formed by cutting the inner peripheral edge of the connecting portion to a position outside the first plate-shaped spring and the second plate-shaped spring. For example, the optical unit with vibration correction function of claim 1, wherein the movable body includes an optical module and a wall portion located on the outer peripheral side of the optical module, and the wall portion is provided at a plurality of positions separated in the circumferential direction. The wall portion is fixed with the coil of the drive mechanism for vibration correction, the serpentine portion or the curved portion of the movable frame is located on the inner peripheral side of the wall portion, and the fulcrum portion is arranged between the wall portions adjacent in the circumferential direction between. For example, the optical unit with vibration correction function of claim 2, wherein the movable body has an optical module and a wall portion located on the outer peripheral side of the optical module, and the wall portion is provided at a plurality of positions separated in the circumferential direction. The wall portion is fixed with the coil of the drive mechanism for vibration correction, the serpentine portion or the curved portion of the movable frame is located on the inner peripheral side of the wall portion, and the fulcrum portion is arranged between the wall portions adjacent in the circumferential direction between.

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