Optical element driving device, camera device, and electronic device

Abstract

The present invention provides an optical element driving device, a camera device and an electronic device that require little space for swinging and are easy to miniaturize. The two end portions of the supporting holes (265) and (275) embedded in the supporting shaft (50) of the prism driving device (3) are cylindrical, and the central portion has a first outer peripheral surface (55) that is flush with the outer peripheral surface of the cylinder along the axis (AXS) of the cylinder and a second outer peripheral surface (52) that is located on the inner side of the outer peripheral surface of the cylinder. The center of the first outer peripheral surface (55) is located on the supporting surface (49), and the second outer peripheral surface (52) is located as a whole on the side of the first outer peripheral surface (55) than the supporting surface (49).

Description

Technical Field

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

[0002] In a camera device mounted on an electronic device such as a smartphone, there is a camera device having a structure that includes a prism for image blur correction and a component that holds the prism in a swingable manner, and the light from the subject is guided to the camera surface of the camera after being reflected by the prism. As a document that discloses technology related to such a camera device, there is Patent Document 1. The periscope camera module described in Patent Document 1 includes a prism, a prism stand having a conical surface for mounting the prism, a support shaft inserted through an axial hole of the prism stand, a magnet and a coil that generate a driving force for the prism stand, and a frame that supports the two ends of the support shaft to swing freely. In this periscope camera module, the prism stand and the prism on its supporting surface swing with the support shaft as a swing axis due to the driving force of the magnet and the coil.

[0003] [Prior art literature]

[0004] [Patent Literature]

[0005] [Patent Document 1] China Utility Model CN205942054U Publication Summary of the invention

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

[0007] However, in the technology of Patent Document 1, the swing axis of the prism does not coincide with the reflection surface of the prism, so there is a problem that a large space is required for the prism to swing at the same angle, making it difficult to reduce the size of the device.

[0008] The present invention has been made in view of such a problem, and an object of the present invention is to provide an optical element driving device, a camera device, and an electronic device that require a small space for swinging and can be easily miniaturized.

[0009]

Methods for solving the problem

[0010] In order to solve the above-mentioned problems, an optical element driving device as a preferred embodiment of the present invention is characterized in that it comprises: a fixing portion having a support hole; a holding component having a support surface formed by the support portion supporting the optical element; and a support shaft that supports the holding component to swing freely relative to the fixing portion, in which the two end portions embedded in the support hole are cylindrical, and the central portion has a first outer peripheral surface that is flush with the outer peripheral surface of the cylinder along the axis of the cylinder and a second outer peripheral surface that is located inner than the outer peripheral surface of the cylinder, the center of the first outer peripheral surface is located on the support surface, and the second outer peripheral surface as a whole is located closer to the first outer peripheral surface than the support surface.

[0011] In this aspect, the second outer peripheral surface may be a flat surface.

[0012] Furthermore, a part of the outer peripheral surface of the support shaft constituted by the first outer peripheral surface and the outer peripheral surface of the cylindrical shape may be fixed to the holding member.

[0013] Alternatively, the fixing portion may include: a frame having two opposing side plates; and a support bearing having the support hole, fixed in all the through holes of the two side plates, and clamped between the frame and the support shaft, the two end portions of the support shaft being respectively embedded in the support holes of the support bearing, so that the component formed by integrating the optical element, the retaining component and the support shaft swings relative to the frame with the center of the support hole of the support bearing as the swing center.

[0014] A camera device as another preferred embodiment of the present invention is characterized by comprising an upper optical element driving device.

[0015] Another preferred embodiment of the present invention is an electronic device comprising the camera device described above.

[0016] [Effects of the invention]

[0017] In the present invention, the two ends of the support hole embedded in the support shaft are cylindrical, and the central part has a first outer peripheral surface that is coplanar with the outer peripheral surface of the cylinder along the axis of the cylinder and a second outer peripheral surface that is located on the inner side of the outer peripheral surface of the cylinder, the center of the first outer peripheral surface is located on the support surface, and the second outer peripheral surface is located on the side of the first outer peripheral surface than the support surface. As a result, the surface of the optical element placed on the support surface can be made consistent with the center of the outer peripheral surface of the support shaft serving as the swing axis. Therefore, according to the present invention, it is possible to provide an optical element driving device that requires a small space for swinging and is easy to miniaturize. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1It is a front view of a smartphone 400 which is an electronic device equipped with the camera device 1 including the prism drive device 3 as one embodiment of the present invention.

[0019] Figure 2 Yes Figure 1 A stereoscopic view of the camera device 1 with a prism drive device 3.

[0020] Figure 3 yes Figure 2 A-A' line cross-section diagram.

[0021] Figure 4 From other perspectives, including Figure 2 A stereoscopic view of the camera device 1 with a prism drive device 3.

[0022] Figure 5 (A) is Figure 4 (B) is a cross-sectional view along the line BB' of FIG. 1 , and (B) is an enlarged view within the frame of (A).

[0023] Figure 6 It is decomposed Figure 2 A stereoscopic view of the prism driving device 3.

[0024] Figure 7 Observe from other angles Figure 6 80 , coil 64 , frame 10 , support bearings 26 and 27 , holding member 40 , support shaft 50 , magnet 61 , leaf spring 70 , and prism 30 .

[0025] Figure 8 (A) is viewed from the direction of arrow C Figure 6 (B) is a diagram of the support shaft 50, (A) is observed from the direction of arrow D, and (C) is a diagram showing the relationship between the second outer peripheral surface 52 of the support shaft 50 of (A) and the reflecting surface 32 of the prism 30.

[0026] Fig. 9 Observed from the direction of arrow E Figure 6 as well as Figure 7 FIG. 70 of the leaf spring.

[0027] Fig.10 (A) means to make Figure 1 (B) is a diagram showing the appearance of the leaf spring 70 when the holding member 40 of the prism driving device 3 is swung in the counterclockwise direction, and (B) is a diagram showing the appearance of the leaf spring 70 when the holding member 40 is swung in the reverse direction.

[0028]

Explanation of symbols

[0029] 1 camera device; 3 prism drive device; 8 lens drive device; 9 lens body; 10 frame; 13 upper plate; 15 rear plate; 16, 17 side plates; 26, 27 support bearing; 30 prism; 31 incident surface; 32 reflection surface; 34 emission surface; 36, 37 side surface; 40 holding member; 41 solid part; 42, 56, 57 end surface; 43 upper surface; 45 rear surface; 46, 47 wall part; 48 support part; 49 support surface; 50 support shaft; 52 second peripheral surface; 55 first peripheral surface; 61 magnet; 64 coil; 70 leaf spring; 73 central part; 76, 77 outer part; 80 FPC; 81 first face part; 82 The second face portion; 83 the recess; 90 the shell; 91, 95, 96, 97 the plate; 100 the image sensor; 151, 731 the opening; 165, 175, 465, 475 the through hole; 261, 271 the small diameter portion; 262, 272 the large diameter portion; 265, 275 the supporting hole; 400 the smartphone; 424 the depression; 425 the recess; 431 the convex portion; 432 the protrusion; 561, 571 the rising surface; 760, 770 the wrist portion; 761, 771 the first cable; 762, 772 the second cable; 801 the frame; 802 the lens holder; 911, 951 the opening; 912, 952 the plate; 941 the base. DETAILED DESCRIPTION

[0030] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, the camera device 1 is embedded in a corner of the back of the housing of the smartphone 400. The camera device 1 includes a prism 30 and a lens 9 as optical elements, a prism drive device 3, a lens drive device 8, and an image sensor 100 that performs photoelectric conversion on light introduced from a subject via the prism 30 and the lens 9.

[0031] In the following, the optical axis direction along the optical axis of the lens body 9 is appropriately referred to as the X direction. In addition, a direction that is orthogonal to the X direction and in which light from the subject enters the prism 30 is appropriately referred to as the Z direction, and the direction orthogonal to both the X direction and the Z direction is appropriately referred to as the Y direction. In addition, the side of the X direction where the prism 30 exists as viewed from the lens body 9 is referred to as the upper side, and the image sensor 100 side as the opposite side is referred to as the lower side. In addition, the side of the subject observed from the prism 30 in the Z direction is referred to as the front side, and the opposite side is referred to as the rear side. In addition, one direction of the Y direction is sometimes referred to as the left side, and the other direction is referred to as the right side. The Z direction is the thickness direction of the camera device 1, the prism drive device 3, and the lens drive device 8, and is the thickness direction of the fixing portion described later.

[0032] like Figure 2 as well as Figure 4As shown, the housing 90 of the camera device 1 is in the shape of a hollow rectangular parallelepiped. The lens body 9 and the lens driving device 8 holding it, and the prism 30 and the prism driving device 3 holding it are arranged side by side in the X direction and accommodated in the space inside the housing 90. The prism driving device 3 is an optical element driving device. As an optical element, in addition to the prism 30, a reflector or the like can also be used.

[0033] like Figure 6 As shown, there is an opening 911 in the plate 91 on the front side of the housing 90, and an opening 951 in the plate 95 on the rear side. The opening 911 enables the lens body 9 to pass through and expose the incident surface 31 of the prism 30. A plate 912 is installed in the opening 911 on the front side, and a plate 952 is installed in the opening 951 on the rear side, so as to cover the lens body 9 from the front and back. In a state where the plate 912 is installed in the opening 911, the prism 30 is exposed to the front side from the upper part of the opening 911. The lower side of the housing 90 is opened, and a base 941 is embedded. On the base 941, the image sensor 100 is fixed with its light-receiving surface facing the lens body 9. In addition, the upper side of the housing 90 is opened, and the frame 10 of the prism drive device 3 described later is embedded and exposed.

[0034] The lens driving device 8 holds the lens body 9 and drives the lens body 9 in the X direction and the Y direction by an electrical signal given from the substrate of the smartphone 400. Figure 3 As shown, the lens driving device 8 has an X-direction support spring (not shown), an X-direction drive magnet and an X-direction drive coil (not shown), and a Y-direction support spring (not shown), a Y-direction drive magnet and a Y-direction drive coil (not shown). When current is supplied to the X-direction drive coil or the Y-direction drive coil of the lens driving device 8, the X-direction drive coil or the Y-direction drive coil generates an electromagnetic force to resist the force of the X-direction spring or the Y-direction spring, and the lens body 9 moves along the X-direction or the Y-direction. The focus can be adjusted by the X-direction movement of the lens body 9, and the hand shake in the Y-direction can be corrected by the Y-direction movement of the lens body 9.

[0035] The prism driving device 3 holds the prism 30 and drives the prism 30 around an axis parallel to the Y direction by an electrical signal given from the substrate of the smartphone 400. Thus, hand shaking in the Z direction can be corrected. Figure 6 as well as Figure 7 As shown, the prism driving device 3 includes a FPC (Flexible Printed Circuits) 80, a coil 64, a frame 10, support bearings 26 and 27, a holding member 40, a support shaft 50, and a leaf spring 70. The housing 90 includes the FPC 80, the coil 64, the frame 10, and the support bearings 26 and 27, which are collectively referred to as a fixing portion.

[0036] The FPC 80 is a component that plays a role in relaying the current supply from the substrate of the smartphone 400 to the coil 64. The FPC 80 has a T-shaped first surface 81 and a U-shaped second surface 82. The first surface 81 of the FPC 80 is folded back at the connection portion with the second surface 82, and the plate 95 on the rear side of the housing 90 is sandwiched between them, and the FPC 80 is stored inside the housing 90. That is, the FPC 80 is mounted on the housing 90 by sandwiching the plate 95 on the rear side of the housing 90 from both sides in the Z direction through the first surface 81 and the second surface 82.

[0037] A recessed portion 83 that is recessed toward the rear side is provided at a corner of the front surface of the first face portion 81 of the FPC 80. The coil 64 is fixed to the first face portion 81 of the FPC 80. The coil 64 has two straight portions extending along the X direction and two semicircular portions connecting them. One of the two semicircular portions of the coil 64 spans the recessed portion 83. The outer portion of the recessed portion 83 is located on the outer side of the coil 64, and the inner portion is located on the inner side of the coil 64. The outer end portion of the coil 64 is connected to the first face portion 81 of the FPC 80, and the inner end portion of the coil 64 is pulled out to the outer side of the coil 64 via the recessed portion 83 and connected to the first face portion 81 of the FPC 80.

[0038] The frame 10 is present at a position in the housing 90 that covers the first surface 81 of the FPC 80 from the front side. The frame 10 has two side plates 16 and 17 that face each other in the Y direction, and an upper plate 13 and a rear plate 15 that are sandwiched between the two side plates 16 and 17. Circular through holes 165 and 175 are formed in the middle of the two side plates 16 and 17. A recess extending in the Z direction is provided at the rear center of the upper plate 13, and a protrusion 431 of the retaining member 40 described later is accommodated in the recess. An opening 151 for accommodating the coil 64 is formed in the rear plate 15. The small diameter portion 261 of the fixed support bearing 26 is inserted into the through hole 165, and the small diameter portion 271 of the fixed support bearing 27 is inserted into the through hole 175.

[0039] The support bearings 26 and 27 are components that are sandwiched between the through holes 165 and 175 and the support shaft 50, support the support shaft 50 in a manner that it can swing freely in the support holes 265 and 275, and assist the swing of the support shaft 50. The support bearings 26 and 27 have cylindrical small diameter parts 261 and 271 with approximately the same diameter as the through holes 165 and 175, and cylindrical large diameter parts 262 and 272 with slightly larger diameters than the through holes 165 and 175. The support holes 265 and 275 are respectively formed in the center of the support bearings 26 and 27. The support hole 265 penetrates between the two end surfaces of the support bearing 26, and the support hole 275 penetrates between the two end surfaces of the support bearing 27. The support bearings 26 and 27 are inserted into the through holes 165 and 175 of the small diameter parts 261 and 271, and are fixed to the frame 10.

[0040] The frame 10 contains a prism 30, a holding member 40, and a support shaft 50 as an integrated component, and the holding member 40 is supported by the frame 10 via a leaf spring 70. The prism 30 has an incident surface 31, a reflection surface 32, an exit surface 34, and two side surfaces 36 and 37 in the Y direction orthogonal to them. The prism 30 has an optical axis parallel to the Z direction from the incident surface 31 to the reflection surface 32, and an optical axis parallel to the X direction from the reflection surface 32 to the exit surface 34. Light from the subject incident on the incident surface 31 of the prism 30 is reflected by the reflection surface 32 and introduced into the lens body 9 via the exit surface 34.

[0041] The holding member 40 is a member that plays a role in holding the prism 30. The holding member 40 is in the shape of a rectangular parallelepiped extending in the Y direction, and a triangular prism-shaped portion that occupies approximately half of the rectangular parallelepiped is cut out. That is, the holding member 40 has a solid portion 41 in the shape of an isosceles right triangular prism, and two walls 46 and 47 that extend from the end of the solid portion 41 in the Y direction in the shape of an isosceles right triangle and face each other in the Y direction. The holding member 40 is in the shape of a rectangle when viewed from the Y direction. The boundary portions of the solid portion 41 with the walls 46 and 47 are provided with through holes 465 and 475, respectively.

[0042] like Figure 6 As shown, the end face 42 facing the front lower side corresponding to the base of the right triangle in the solid part 41 of the holding member 40 is formed into a tapered surface inclined at approximately 45 degrees relative to the XY plane and the YZ plane. At each position separated from each other at the boundary part of the end face 42 with the wall parts 46 and 47, a semicircular support part 48 slightly raised than the end face 42 is provided. The support part 48 is used to carry the prism 30. The front ends of the four support parts 48 form a support surface 49, and the support surface 49 is consistent with the reflection surface 32 of the prism 30. The centers of the support holes 265 and 275 of the support bearings 26 and 27 are consistent when viewed from the Y direction and are included in the support surface 49. The support surface 49 and the end face 42 are approximately parallel, and the end face 42 does not exceed and protrude from the support surface 49.

[0043] The end surface 42 of the solid portion 41 has a recessed portion 425 that is hollowed out in a semicircular shape. When viewed from the Y direction, the through hole 465 of the wall portion 46 and the through hole 475 of the wall portion 47 overlap with the recessed portion 425 of the solid portion 41. The through hole 465 and the recessed portion 425 are provided at the approximate center of the end surface 42. The support shaft 50 described later is accommodated and fixed in the through hole 465 and the recessed portion 425. In addition, four recesses 424 that are recessed in a stepped shape are provided on the end surface 42 in order to balance the weight around the support shaft 50 when the prism 30 is mounted.

[0044] like Figure 3 , Figure 5As shown in (A), a recessed portion for accommodating and fixing the magnet 61 is provided on the rear side 45 of the solid portion 42. The magnet 61 is a component that functions as a driving portion of the driving holding component 40 together with the coil 64. The rear side end surface of the magnet 61 is slightly spaced from the coil 64 and faces each other. Figure 3 as well as Figure 7 As shown in FIG. 1 , the center portion in the Y direction of the upper surface 43 of the solid portion 41 protrudes upward as a convex portion 431 . The convex portion 431 is fitted into the opening 731 of the leaf spring 70 .

[0045] The support shaft 50 is a member that plays the role of supporting the holding member 40 so that it can swing freely. Figure 8 (A) and Figure 8 As shown in (B), the support shaft 50 has a shape that is a semi-cylindrical shape obtained by cutting off the central portion of the elongated cylindrical shape in the extending direction. The diameter of the support shaft 50 is slightly smaller than the diameters of the through holes 465, 475, 265, and 275. The length of the support shaft 50 is longer than the interval between the walls 46 and 47 facing each other in the Y direction in the holding member 40, and shorter than the interval between the plates 96 and 97 facing each other in the Y direction in the housing 90.

[0046] The two ends of the support shaft 50 are cylindrical. The central portion of the support shaft 50 has a first outer peripheral surface 55 and a second outer peripheral surface 52 housed on the inner side than the first outer peripheral surface 55. The first outer peripheral surface 55 is flush with the cylindrical outer peripheral surfaces at both ends along the axis AXS passing through the center O of the cylinder. The center of the first outer peripheral surface 55 is located at the same position as the axis AXS. The second outer peripheral surface 52 is a substantially flat surface. The second outer peripheral surface 52 is located on the inner side than the outer peripheral surface of the cylinder. The second outer peripheral surface 52 is disposed at a position where the outer periphery of the cylinder of which the first outer peripheral surface 55 forms a part exceeds the axis AXS and is cut to the inside. The boundary between the second outer peripheral surface 52 and the rising surfaces 571 and 561 at both ends thereof is gently curved. The prism 30 is as shown in FIG. Figure 8 As shown in (C), it is configured to be housed in a position across the cutout of the axis AXS.

[0047] The support shaft 50 is supported so that its second outer peripheral surface 52 faces the normal direction of the end surface 42 of the holding member 40, and the central portion is embedded in the recessed portion 425 of the holding member 40. Both ends of the support shaft 50 in the Y direction pass through the through holes 465 and 475 of the holding member 40, and are inserted halfway from one end of the support holes 265 and 27 of the support bearings 26 and 27. The center O of the cylindrical shape at both ends of the support shaft 50 coincides with the center of the through holes 465 and 475 of the holding member 40.

[0048] like Figure 5As shown in (B), the inner surface of the plate 96 of the housing 90 and the inner surface of the plate 97 face each other in the Y direction with the frame 10 sandwiched therebetween, and abut against the end surfaces of the large diameter portions 262 and 272 of the support bearings 26 and 27. The inner surface of the plate 96 and the inner surface of the plate 97 block the other end sides of the support hole 265 of the support bearing 26 and the support hole 275 of the support bearing 27.

[0049] The side surfaces 36 and 37 of the prism 30 located on the support surface 49 of the holding member 40 are bonded and fixed to the wall portions 46 and 47 of the holding member 40. In addition, a portion of the outer peripheral surface of the support shaft 50, which is composed of the first outer peripheral surface 55 and the cylindrical outer peripheral surfaces of the two end portions, is fixed to at least one of the through holes 465 and 475 or the recessed portion 425 of the holding member 40. An adhesive is filled between the outer peripheral surface of the support shaft 50 in the through hole 465 and the inner peripheral surface of the through hole 475, and between the outer peripheral surface of the support shaft 50 in the through hole 475 and the inner peripheral surface of the through hole 475, to fix the holding member 40 and the support shaft 50. Thus, the holding member 40, the prism 30, and the support shaft 50 are integrated.

[0050] When the holding member 40, the prism 30 and the support shaft 50 are integrated, the center O of the first peripheral surface 55 of the support shaft 50 is located on the support surface 49 of the holding member 40 and the reflection surface 32 of the prism 30, and the second peripheral surface 52 is located on the first peripheral surface 55 side relative to the support surface 49 and the reflection surface 32. That is, since the assembly is parallel to the end surface 42, the center O of the first peripheral surface 55 of the support shaft 50 is located on the support surface 49 of the holding member 40 and the reflection surface 32. Figure 8 As shown in (C), the second outer peripheral surface 52 is smaller than the height of the support surface 49 of the holding member 40 and does not contact the reflecting surface 32. In addition, even if the second outer peripheral surface 52 is not parallel to the end surface 42, the second outer peripheral surface 52 is smaller than the height of the support surface 49 of the holding member 40. Figure 8 As shown in FIG. 5C , a gap GP can be formed between the reflection surface 32 of the prism 30 and the second outer peripheral surface 52 of the support shaft 50 .

[0051] like Figure 5As shown in (B), the portion of the support shaft 50 embedded in the support holes 265 and 275 of the support bearings 26 and 27, the space between the outer circumferential surface of the support shaft 50 and the inner circumferential surface of the support hole 265, and the space between the outer circumferential surface of the support shaft 50 and the inner circumferential surface of the support hole 275 are filled with a viscoelastic resin. The viscoelastic resin is a so-called shock-absorbing rubber. Shock-absorbing rubber is also provided on the end faces 56 and 57 of the support shaft 50. The shock-absorbing rubber can suppress the vibration generated by the integration of the holding component 40, the prism 30 and the support shaft 50 due to being supported by the leaf spring 70 as soon as possible. In addition, the shock-absorbing rubber is easy to maintain its shape compared to the so-called liquid lubricant, and it is easy to keep the support shaft 50 at the center position of the support holes 265 and 275. In addition, the space between the end faces 56 and 57 of the support shaft 50 in the support holes 265 and 275 and the plates 96 and 97 of the housing 90 as the fixing part becomes airtight. Furthermore, the holding member 40 , the prism 30 , and the integrated component of the holding member 40 are capable of swinging relative to the housing 10 .

[0052] The leaf spring 70 is a component that plays a role in limiting the action of connecting the fixed part, i.e., the frame 10 and the holding part 40, so as to integrate the holding part 40, the prism 30 and the holding part 40. The leaf spring 70 is extended in the YZ plane, that is, it is set to extend in the extension direction of the support shaft 50 and the thickness direction of the fixed body, i.e., the thickness direction of the frame 10. That is, the leaf spring 70 is set along the stacking direction of the coil 64 and the magnet 61 and does not overlap with the coil 64 and the magnet 61. Fig. 9 As shown, the leaf spring 70 has outer portions 76 and 77 formed at both ends, a central portion 73 formed in the center, and arm portions 760 and 770 connecting the outer portions 76 and 77 and the central portion 73. The two arm portions 760 and 770 have twisted shapes. The outer portion 76, the central portion 73, and the outer portion 77 are formed in parallel in the Y direction in such a manner that they extend in the Z direction. For convenience, the portion having the outer portion 76, the central portion 73, and the arm portion 760 and the portion having the outer portion 77, the central portion 73, and the arm portion 770 are respectively referred to as leaf spring leaves. The leaf spring 70 is formed as a whole with line symmetry with the central portion 73 as the axis of symmetry. In addition, the two leaf spring leaves are formed with line symmetry in the Y direction and the Z direction, respectively.

[0053] To explain more specifically, the leaf spring 70 as a whole is a plate body, and the central portion 73 and the outer portions 76 and 77 are also flat plate bodies. A rectangular opening 731 is provided at the center of the central portion 73. The size of the opening 731 is slightly larger than the size of the protrusion 431 of the retaining member 40. The wrist portion 760 has a first cable 761 connecting the front ends of the central portion 73 and the outer portion 76 and a second cable 762 connecting the rear ends of the central portion 73 and the outer portion 76, and the wrist portion 770 has a first cable 771 connecting the front ends of the central portion 73 and the outer portion 77 and a second cable 772 connecting the rear ends of the central portion 73 and the outer portion 77.

[0054] The first cables 761 and 771 and the second cables 762 and 772 have the following shape: the letter "S" and its mirror image are opposite to each other, and the ends toward the outside of the two letters extend along the Y direction and are connected to the ends of the central part 73 and the outer parts 76 and 77, and the ends toward the inside extend and are connected to each other along the Y direction.

[0055] The leaf spring 70 is fixed to the holding member 40 by being embedded in the convex portion 431 of the holding member 40 in the opening 731. The outer portions 76 and 77 of the leaf spring 70 are fixed to the protrusions 432 located at the intersection of the side plates 16 and 17 of the frame 10 and the upper plate 13. The leaf spring 70 is installed in a state of being substantially kept as a flat plate. The holding member 40 in the frame 10 is held by the leaf spring 70 in a position where its upper surface 43 is parallel to and opposite to the upper plate 13 of the frame 10 (hereinafter, this position is referred to as the initial position).

[0056] exist Figure 3 In the embodiment, when a current flows from the FPC 80 to the coil 64, the magnet 61 generates a driving force in the X direction through the electromagnetic action between the coil 64 and the magnet 61. The magnet 61 is offset in the Z direction rearward relative to the support shaft 50, so when the magnet 61 generates a driving force in the X direction downward, the holding component 40 and the prism 30 held therein rotate counterclockwise around the support shaft 50. At this time, the holding component 40 and the frame 10 are connected together by the leaf spring 70, so that the prism 30, the holding component 40 and the support shaft 50 are rotated until the driving force generated in the magnet 61 and the force applied by the deformation of the leaf spring 70 are balanced. As a result, the outgoing light from the prism 30 is emitted in a direction rotating in the counterclockwise direction relative to the outgoing light at the initial position, and reaches the image sensor 100 via the lens body 9. When the supply of current to the coil 64 is stopped, the integrated component of the prism 30 , the holding member 40 , and the support shaft 50 rotates in the clockwise direction due to the restoring force of the leaf spring 70 and returns to the initial position.

[0057] When a reverse current flows through the coil 64, a driving force in the upper direction of the X direction is generated on the magnet 61, and the prism 30, the holding member 40, and the integrated member of the support shaft 50 rotate clockwise to a position where the driving force and the applied force are balanced. As a result, the emitted light from the prism 30 is emitted in a clockwise direction relative to the emitted light at the initial position, and reaches the image sensor 100 through the lens body 9. When the current supply to the coil 64 stops, the prism 30, the holding member 40, and the integrated member of the support shaft 50 rotate counterclockwise and return to the initial position.

[0058] like Fig.10 As shown in (A) and (B), when the integrated component of the prism 30, the holding member 40 and the support shaft 50 swings with the support shaft 50 as the swing axis, the central portion 73 of the leaf spring 70 moves relative to the outer portions 76 and 77 in the front-rear direction. At this time, strictly speaking, the central portion 73 of the leaf spring 70 swings in an arc shape with the support shaft 50 as the center, so the leaf spring 70 is deformed while being twisted between the central portion 73 and the outer portions 76 and 77.

[0059] The above are details of the present embodiment. According to the present embodiment, the following effects can be obtained.

[0060] In the present embodiment, the two end portions of the support shaft 50 that are embedded in the support holes 265 and 275 are cylindrical, and the central portion has a first outer peripheral surface 55 that is flush with the outer peripheral surface of the cylinder along the axis AXS of the cylinder and a second outer peripheral surface 52 that is located inside the outer peripheral surface of the cylinder. The center of the first outer peripheral surface 55 is located on the support surface 49, and the second outer peripheral surface 52 is located on the side of the first outer peripheral surface 55 that is closer to the support surface 49 as a whole. Therefore, the reflection surface 32 of the prism 30 placed on the support surface 49 can be made consistent with the center of the outer peripheral surface of the swing axis, that is, the support shaft 50. Therefore, according to the present embodiment, a prism driving device 3 that requires a small space for swinging and is easy to be miniaturized can be provided.

[0061] In addition, in the present embodiment, there are provided a support shaft 50 for supporting the holding member 40 to swing freely relative to the frame 10 and a leaf spring 70 for connecting the frame 10 and the holding member 40. The leaf spring 70 is extended and arranged on a plane including the Y direction in which the support shaft 50 extends, that is, on a YZ plane. Thus, the holding member 40 supporting the prism 30 can be easily returned to the initial position by the elastic force of the leaf spring 70. Therefore, according to the present embodiment, it is possible to provide a prism driving device 3 that can easily return the mounted prism 30 to the initial position.

[0062] In addition, in the present embodiment, a support shaft 50 for supporting the holding member 40 is provided, and support bearings 26 and 27 as fixed parts are arranged at both end positions of the support shaft 50 so that the support shaft 50 can swing freely relative to the support holes 265 and 275 in the support holes 265 and 275. A resin having viscoelasticity is filled between the outer peripheral surface of the support shaft 50 and the inner peripheral surface of the support bearings 26 and 27 in the support holes 265 and 275. The resin makes it difficult for an impact to be transmitted to the support shaft 50, that is, to the prism 30 supported by the support shaft 50. Therefore, according to the present embodiment, it is possible to provide a prism driving device 3 in which even if an impact is applied, the impact is difficult to be transmitted to the prism 30.

[0063] In addition, in this embodiment, there are provided a support shaft 50 fixed to the holding member 40, and support bearings 26 and 27, which are fixed parts, that is, support shafts 50 are supported in the support holes 265 and 275 thereof so as to swing freely. The support shaft 50 is inserted from one end of the support holes 265 and 275, and the plates 96 and 97 of the housing 90, which are the fixed parts, block the other end side of the support holes 265 and 275. The space between the support shaft 50 and the plates 96 and 97 in the support holes 265 and 275 of the support bearings 26 and 27 becomes airtight, and air can be retained in the space, and the retained air functions as an air spring. Therefore, even if the support shaft 50 moves in the Y direction, it will not collide with the plates 96 and 97, and even if it collides, the impact is small. Therefore, according to this embodiment, it is possible to provide a prism driving device 3 in which the prism 30 and the parts supporting it, that is, the holding member 40 and the support shaft 50, are unlikely to move along the support shaft 50 and collide with other parts.

[0064] In addition, in the present embodiment, the support bearings 26 and 27 may not be provided, and the support shaft 50 may be directly embedded in the through holes 165 and 175 of the frame 10. In this case, the through holes 165 and 175 are regarded as the support holes 265 and 275. The thickness of the two side plates 16 and 17 of the frame 10 and the through holes 165 and 175 at the center thereof in the Y direction becomes thicker, and the diameter of the through holes 165 and 175 is slightly thicker than the diameter of the support shaft 50. The two ends of the support shaft 50 are inserted into the through holes 165 and 175, and the inner peripheral surface of the through holes 165 and 175 and the outer peripheral surface of the support shaft 50 are filled with a viscoelastic resin, so that the outer side surfaces of the side plates 16 and 17 are in contact with the inner side surfaces of the plates 96 and 97 of the housing 90, and the through holes 165 and 175 are blocked.

[0065] In addition, in the present embodiment, if the leaf spring 70 is extended along the extension direction of the support shaft 50, that is, on a plane including the Y direction, it is not necessary to be arranged along the thickness direction of the frame 10. For example, it can also be arranged to extend in a direction parallel to the end surface 42. In this case, the central portion 73 and the outer portions 76 and 77 of the leaf spring 70 are arranged to always be parallel in the Y direction. Among them, in the present embodiment, for the leaf spring 70, the outer portions 76 and 77 are installed on the fixed portion, and the central portion 73 is installed on the retaining member 40, but it is also possible that the outer portions 76 and 77 are installed on the retaining member 40, and the central portion 73 is installed on the fixed portion.

[0066] In addition, in the present embodiment, the member for closing the support holes 265 and 275 of the support bearings 26 and 27 does not need the plates 96 and 97 of the housing 90. For example, only the member for closing the support holes 265 and 275 may be attached to the support bearings 26 and 27. In addition, the support holes 265 and 275 may not be completely closed, but a slight air overflow port may be provided.

Claims

1. An optical element driving device, characterized in that: have: A fixing portion having a supporting hole; a holding member having a supporting surface formed by a supporting portion for supporting the optical element; and a support shaft that supports the holding member so as to be swingable relative to the fixing portion, The support shaft has two ends embedded in the support hole and is cylindrical, and the central portion has a first outer peripheral surface that is flush with the outer peripheral surface of the cylinder along the axis of the cylinder and a second outer peripheral surface that is located on the inner side of the outer peripheral surface of the cylinder. The center of the first outer peripheral surface is located on the support surface, and the entire second outer peripheral surface is located closer to the first outer peripheral surface than the support surface.

2. The optical element driving device according to claim 1, characterized in that: The optical element is a prism, and its reflecting surface and the supporting surface are located on the same plane.

3. The optical element driving device according to claim 1, characterized in that: The second outer peripheral surface is a flat surface.

4. The optical element driving device according to claim 1, characterized in that: A portion of the outer peripheral surface of the support shaft, which is constituted by the first outer peripheral surface and the outer peripheral surface of the cylindrical shape, is fixed to the holding member.

5. The optical element driving device according to claim 1, characterized in that: The fixing part comprises: a frame having two opposite side plates; and a support bearing having the support hole, fixed in the through holes of the two side plates, and sandwiched between the frame and the support shaft. The two end portions of the support shaft are respectively embedded in the support holes of the support bearing. The component in which the optical element, the holding member, and the support shaft are integrated swings relative to the frame body with the center of the support hole of the support bearing as the swing center.

6. A camera device, characterized in that: A method of driving an optical element according to claim 1 is provided.

7. An electronic device, characterized in that: A camera device according to claim 6.

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