Optical Element Driving Device, Camera Device, and Electronic Equipment

Abstract

The present invention provides an optical element driving device, a camera device, and an electronic device that are difficult to transmit an impact to an optical element even when the impact is applied. The prism driving device (3) includes a support shaft (50) that supports and holds a support and holding member (40), and support bearings (26) and (27) as fixed portions that are disposed at both end portions of the support shaft (50) and support the support shaft (50) so as to be swingable freely within the support holes (265) and (275). Further, a resin having viscoelasticity is filled between the outer peripheral surface of the support shaft (50) and the inner peripheral surfaces within the support holes (265) and (275) of the support bearings (26) and (27).

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 configured to include a prism for image blur correction and a member that swingably holds the prism, and light from a subject is introduced into an imaging surface of the camera through reflection by the prism. As a document disclosing a technique related to such a camera device, there is Patent Document 1. The periscope imaging module described in Patent Document 1 includes a prism, a prism pedestal on which a conical surface of the prism is placed, a support shaft inserted through a shaft hole of the prism pedestal, a magnet and a coil that generate a driving force for the prism pedestal, and a frame that swingably supports both ends of the support shaft. In this periscope imaging module, the prism pedestal and the prism on its support surface swing about the support shaft by the driving force of the magnet and the coil.

[0003]

Prior Art Documents

[0004]

Patent Documents

[0005]

Patent Document 1

[0006]

Problems to be Solved by the Invention

[0007] However, in the technique of Patent Document 1, there is a problem that when an impact is applied, it is easy to transmit the impact to the prism.

[0008] The present invention has been completed in view of this problem, and an object thereof is to provide an optical element driving device, a camera device, and an electronic device that are difficult to transmit an impact to an optical element even when an impact is applied.

[0009]

Means for Solving the Problems

[0010] In order to solve the above problems, an optical element driving device as a preferred embodiment of the present invention is characterized by comprising: a fixed part having a support hole; a holding member having a support part for supporting an optical element; and a support shaft for supporting the holding member. The shape of the support shaft is such that a central part occupying its extending direction is cut off from a slender cylindrical shape, leaving a semi-cylindrical shape, and both end parts of the support shaft are cylindrical. The both end parts of the support shaft respectively pass through through-holes of the holding member and are inserted into the support hole of the fixed part, and the support shaft is swingably supported in the support hole. An adhesive is filled between the outer peripheral surface of the support shaft in the through-hole and the inner peripheral surface of the through-hole to fix the holding member and the support shaft, and a resin having viscoelasticity is filled between the outer peripheral surface of the support shaft and the inner peripheral surface of the support hole of the fixed part.

[0011] In this embodiment, the resin having viscoelasticity may be damping rubber.

[0012] Alternatively, the fixed part may comprise: a frame body having two opposing side plates; and a support bearing having the support hole and fixed to the frame body. The both end parts of the support shaft are respectively inserted into the support holes of the support bearing, and a resin having viscoelasticity is provided between the outer peripheral surface of the support shaft in the support hole of the support bearing and the inner peripheral surface of the support hole, and on the end surface of the support shaft.

[0013] A camera device as another preferred embodiment of the present invention is characterized by comprising the above optical element driving device.

[0014] An electronic device as another preferred embodiment of the present invention is characterized by comprising the above camera device.

[0015]

Advantages of the Invention

[0016] In the present invention, there are provided: a support shaft for supporting a holding member; and a fixed part disposed at positions of both end parts of the support shaft. The support shaft swingably supported in the support hole, and a resin having viscoelasticity is filled between the outer peripheral surface of the support shaft and the inner peripheral surface of the support hole of the fixed part. Due to this resin, impact is difficult to be transmitted to the support shaft, that is, difficult to be transmitted to the optical component supported by the support shaft. Therefore, according to the present invention, an optical element driving device that is difficult to transmit impact to the optical element even when impact is applied can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a front view of a smartphone 400 which is an electronic device equipped with a camera device 1 including a prism driving device 3 as an embodiment of the present invention.

[0018] Figure 2 is a perspective view of the camera device 1 of the prism driving device 3 including Figure 1 .

[0019] Figure 3 is Figure 2 a sectional view taken along line A-A' of

[0020] Figure 4 is a perspective view of the camera device 1 of the prism driving device 3 including Figure 2 observed from another angle.

[0021] Figure 5 (A) of Figure 4 is a sectional view taken along line B-B' of , and (B) is an enlarged view of the inside of the frame of (A).

[0022] Figure 6 is a perspective view of the disassembled Figure 2 prism driving device 3.

[0023] Figure 7 is a perspective view of the FPC 80, coil 64, housing 10, support bearings 26 and 27, holding member 40, support shaft 50, magnet 61, leaf spring 70, and prism 30 of Figure 6 observed from another angle.

[0024] Figure 8 (A) of Figure 6 is a view of the support shaft 50 observed from the direction of arrow C, (B) is a view of (A) observed from the direction of arrow D, and (C) is a view 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.

[0025] Figure 9 is a view of the leaf spring 70 of Figure 6 and Figure 7 observed from the direction of arrow E.

[0026] Figure 10 (A) of Figure 1 is a view showing the state of the leaf spring 70 when the holding member 40 of the prism driving device 3 of

[0027]

Reference Signs

[0028] 1 Camera device; 3 Prism drive device; 8 Lens drive device; 9 Lens body; 10 Housing; 13 Upper plate; 15 Rear plate; 16, 17 Side plates; 26, 27 Support bearings; 30 Prism; 31 Incident surface; 32 Reflecting surface; 34 Exit surface; 36, 37 Side surfaces; 40 Holding member; 41 Solid portion; 42, 56, 57 End faces; 43 Upper surface; 45 Rear surface; 46, 47 Wall portions; 48 Support portion; 49 Support surface; 50 Support shaft; 52 Second outer peripheral surface; 55 First outer peripheral surface; 61 Magnet; 64 Coil; 70 Leaf spring; 73 Central portion; 76, 77 Outer portions; 80 FPC; 81 First face; 82 Second face; 83 Recess; 90 Housing; 91, 95, 96, 97 Plates; 100 Image sensor; 151, 731 Openings; 165, 175, 465, 475 Through holes; 261, 271 Small diameter portions; 262, 272 Large diameter portions; 265, 275 Support holes; 400 Smart phone; 424 Depression; 425 Recess; 431 Protrusion; 432 Projection; 561, 571 Upright surfaces; 760, 770 Wrist portions; 761, 771 First cables; 762, 772 Second cables; 801 Housing; 802 Lens holder; 911, 951 Openings; 912, 952 Plates; 941 Base. Detailed implementation mode

[0029] Hereinafter, embodiments of the present invention will be described with reference to the drawings. As Figure 1 shown, the camera device 1 is buried in a corner of the back surface of the housing of the smart phone 400. The camera device 1 includes a prism 30 as an optical element, a lens body 9, a prism drive device 3, a lens drive device 8, and an image sensor 100 that photoelectrically converts light introduced from a subject via the prism 30 and the lens body 9.

[0030] Hereinafter, the optical axis direction along the optical axis of the lens body 9 will be appropriately referred to as the X direction. In addition, one direction orthogonal to the X direction and in which light from the subject enters the prism 30 will be appropriately referred to as the Z direction, and a direction orthogonal to both the X direction and the Z direction will be appropriately referred to as the Y direction. In addition, the side where the prism 30 exists when viewed from the lens body 9 in the X direction is referred to as the upper side, and the side of the image sensor 100 as the opposite side is referred to as the lower side. In addition, the side of the subject when viewed 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 in the Y direction may be referred to as the left side, and the other direction may be 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 a fixing portion described later.

[0031] As Figure 2 and Figure 4As shown, the housing 90 of the camera device 1 is in the shape of a hollow rectangular parallelepiped. The lens unit 9 and the lens driving device 8 that holds it, as well as the prism 30 and the prism driving device 3 that holds it, are arranged side by side in the X direction and housed in the space inside the housing 90. The prism driving device 3 is an optical element driving device. As the optical element, in addition to the prism 30, it can also be a mirror or the like.

[0032] As Figure 6 shown, there is an opening 911 in the front plate 91 of the housing 90, and an opening 951 in the rear plate 95. The opening 911 allows the lens unit 9 to pass through and exposes the incident surface 31 of the prism 30. A plate 912 is installed in the front opening 911, and a plate 952 is installed in the rear opening 951 to cover the lens unit 9 from the front and rear. In the state where the plate 912 is installed in the opening 911, starting from the upper side portion of the opening 911, the prism 30 is exposed to the front side. A base 941 is embedded in the lower opening of the housing 90. On the base 941, the image sensor 100 is fixed with its light-receiving surface facing the lens unit 9. In addition, a frame 10 of the prism driving device 3 described later is embedded and exposed in the upper opening of the housing 90.

[0033] The lens driving device 8 holds the lens unit 9 and drives the lens unit 9 in the X direction and the Y direction by an electrical signal given from the substrate of the smartphone 400. As Figure 3 shown, the lens driving device 8 has an X-direction support spring (not shown), an X-direction driving magnet, an X-direction driving coil (not shown), a Y-direction support spring (not shown), a Y-direction driving magnet, and a Y-direction driving coil (not shown). When a current is supplied to the X-direction driving coil or the Y-direction driving coil of the lens driving device 8, the X-direction driving coil or the Y-direction driving coil generates an electromagnetic force that resists the force exerted by the X-direction spring or the Y-direction spring, and the lens unit 9 moves in the X direction or the Y direction. By moving the lens unit 9 in the X direction, the focus can be adjusted, and by moving the lens unit 9 in the Y direction, shake in the Y direction can be corrected.

[0034] The prism driving device 3 holds the prism 30 and drives the prism 30 to rotate about an axis parallel to the Y direction by an electrical signal given from the substrate of the smartphone 400. Thereby, shake in the Z direction can be corrected. As Figure 6 and Figure 7 shown, the prism driving device 3 has an FPC (Flexible Printed Circuits), a coil 64, a frame 10, support bearings 26 and 27, a holding member 40, a support shaft 50, and a leaf spring 70. Including the housing 90, the FPC 80, the coil 64, the frame 10, and the support bearings 26 and 27 are collectively referred to as the fixed part.

[0035] The FPC80 is a component that functions to relay the current supply from the substrate of the smartphone 400 to the coil 64. The FPC80 has a T-shaped first face 81 and a U-shaped second face 82. The first face 81 of the FPC80 folds back at the connecting portion with the second face 82, sandwiches the rear plate 95 of the housing 90 therebetween, and is housed inside the housing 90. That is, the FPC80 sandwiches the rear plate 95 of the housing 90 from both sides in the Z direction by the first face 81 and the second face 82, and is mounted on the housing 90.

[0036] At a corner of the front surface of the first face 81 of the FPC80, there is a recess 83 that is recessed backward. The coil 64 is fixed to the first face 81 of the FPC80. The coil 64 has two linear portions extending along the X direction and two semicircular portions connecting them. One of the two semicircular portions of the coil 64 straddles the recess 83. The outer portion of the recess 83 is located outside the coil 64, and the inner portion is located inside the coil 64. The outer end of the coil 64 is connected to the first face 81 of the FPC80, and the inner end of the coil 64 is pulled out to the outside of the coil 64 via the recess 83 and is connected to the first face 81 of the FPC80.

[0037] At a position inside the housing 90 that covers the first face 81 of the FPC80 from the front side, there is a frame 10. The frame 10 has two side plates 16 and 17 facing each other in the Y direction and an upper plate 13 and a rear plate 15 sandwiched between the two side plates 16 and 17. At the exact middle between the two side plates 16 and 17, circular through-holes 165 and 175 are formed. At the center rear of the upper plate 13, there is a recess extending along the Z direction, and a convex portion 431 of a holding member 40 described later is housed in this recess. An opening 151 for housing the coil 64 is formed in the rear plate 15. The small-diameter portion 261 of the support bearing 26 is inserted and fixed in the through-hole 165, and the small-diameter portion 271 of the support bearing 27 is inserted and fixed in the through-hole 175.

[0038] 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 so as to be freely swingable within the support holes 265 and 275, and assist the swinging of the support shaft 50. The support bearings 26 and 27 have cylindrical small-diameter portions 261 and 271 having substantially the same diameter as the through-holes 165 and 175 and cylindrical large-diameter portions 262 and 272 having a slightly larger diameter than that. In the support bearings 26 and 27, support holes 265 and 275 are respectively formed at the centers. The support hole 265 penetrates between the two end faces of the support bearing 26, and the support hole 275 penetrates between the two end faces of the support bearing 27. The support bearings 26 and 27 insert the small-diameter portions 261 and 271 into the through-holes 165 and 175 and are fixed to the frame 10.

[0039] Inside the housing 10, a component formed by integrating the prism 30, the holding member 40, and the support shaft 50 is housed. The holding member 40 is supported by the housing 10 via the 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. The light incident on the incident surface 31 of the prism 30 from the subject is reflected by the reflection surface 32 and introduced into the lens body 9 via the exit surface 34.

[0040] The holding member 40 is a member that functions to hold the prism 30. The holding member 40 has a shape obtained by cutting a triangular prism portion that occupies approximately half of a rectangular parallelepiped extending along the Y direction. That is, the holding member 40 has a solid portion 41 in the shape of an isosceles right triangular prism, and two wall portions 46 and 47 that extend in an isosceles right triangle shape from the end portions of the solid portion 41 in the Y direction and face each other in the Y direction. The holding member 40 has a rectangular shape when viewed from the Y direction. Through holes 465 and 475 are provided at the boundary portions of the solid portion 41 with the wall portions 46 and 47, respectively.

[0041] As Figure 6 shown, the end face 42 of the solid portion 41 of the holding member 40 corresponding to the base of the right triangle and facing the lower front side direction is a conical surface that is inclined approximately 45 degrees with respect to the XY plane and the YZ plane. At the end face 42, at each position separated from the boundary portions of the wall portions 46 and 47, semi-circular support portions 48 that protrude slightly from the end face 42 are provided. The support portions 48 are used to place the prism 30. The front ends of the four support portions 48 form a support surface 49, and the support surface 49 coincides 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 coincide when viewed from the Y direction and are included in the support surface 49. The support surface 49 and the end face 42 are substantially parallel, and the end face 42 does not cross and protrude from the support surface 49.

[0042] At the end face 42 of the solid portion 41, there is a semi-circular recess 425 dug out. 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 coincide with the recess 425 of the solid portion 41. The through holes 465 and 475 and the recess 425 are provided at approximately the center of the end face 42. The support shaft 50 described later is housed and fixed in the through holes 465 and 475 and the recess 425. In addition, on the end face 42, in order to achieve weight balance around the support shaft 50 when the prism 30 is installed, four depressions 424 that are recessed stepwise are provided.

[0043] As Figure 3 、 Figure 5As shown in (A) of FIG. , a recess for receiving and fixing the magnet 61 is provided behind 45 the solid portion 42. The magnet 61, together with the coil 64, functions as a driving portion of the driving and holding member 40. The rear end face of the magnet 61 faces the coil 64 with a slight gap therebetween. Further, as Figure 3 and Figure 7 shown, a central 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.

[0044] The support shaft 50 functions to swingably support the holding member 40. As shown in (A) of FIG. Figure 8 and (B) of FIG. Figure 8 The shape of the support shaft 50 is such that it starts from an elongated cylindrical shape and is cut to remove the central portion in its extending direction, leaving a semi-cylindrical shape. 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 distance between the wall portions 46 and 47 facing each other in the Y direction in the holding member 40 and shorter than the distance between the plates 96 and 97 facing each other in the Y direction in the housing 90.

[0045] Both 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 received inside the first outer peripheral surface 55. The first outer peripheral surface 55 is coplanar with the cylindrical outer peripheral surfaces of the 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 substantially planar. The second outer peripheral surface 52 is located inside the cylindrical outer peripheral surface. The second outer peripheral surface 52 is provided at a position where it starts from the outer circumference of the cylinder of which the first outer peripheral surface 55 forms a part, exceeds the axis AXS, and is cut into the interior. The boundary between the second outer peripheral surface 52 and the upright surfaces 571 and 561 at its both ends is gently curved. The prism 30 is arranged to be received in the position cut across the axis AXS as shown in (C) of FIG. Figure 8 As shown in (C) of FIG.

[0046] The support shaft 50 is supported such that its second outer peripheral surface 52 faces the normal direction of the end face 42 of the holding member 40, and the central portion is fitted into the recess 425 of the holding member 40. The 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 275 of the support bearings 26 and 27. The centers O of the cylindrical shapes at both ends of the support shaft 50 coincide with the centers of the through holes 465 and 475 of the holding member 40.

[0047] As shown in Figure 5As shown in (B) thereof, the inner surfaces of the plate 96 and the plate 97 of the housing 90 face each other in the Y direction with the frame 10 therebetween, and abut against the end faces of the large-diameter portions 262 and 272 of the support bearings 26 and 27. The inner surfaces of the plate 96 and the plate 97 block the other end sides of the support holes 265 of the support bearing 26 and the support holes 275 of the support bearing 27.

[0048] The sides 36 and 37 of the prism 30 located on the support surface 49 of the holding member 40 and the wall portions 46 and 47 of the holding member 40 are adhesively fixed. In addition, a part of the outer peripheral surface of the support shaft 50 composed of the first outer peripheral surface 55 and the cylindrical outer peripheral surfaces at both ends is fixed to at least one of the through holes 465 and 475 or the recess 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.

[0049] When observing the integrated component of the holding member 40, the prism 30, and the support shaft 50 in the Y direction, the center O of the first outer 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 entire second outer peripheral surface 52 is located on the side of the first outer peripheral surface 55 with respect to the support surface 49 and the reflection surface 32. That is, since it is assembled in parallel with the end face 42, as Figure 8 shown in (C) thereof, 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 reflection surface 32. In addition, even if the second outer peripheral surface 52 is not parallel to the end face 42, the second outer peripheral surface 52 is also smaller than the height of the support surface 49 of the holding member 40. Thus, as Figure 8 shown in (C) thereof, 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.

[0050] As Figure 5As shown in (B) of FIG. 0, the portions of the support shaft 50 embedded in the support holes 265 and 275 of the support bearings 26 and 27, between the outer peripheral surface of the support shaft 50 and the inner peripheral surface of the support hole 265, and between the outer peripheral surface of the support shaft 50 and the inner peripheral surface of the support hole 275, are filled with viscoelastic resin. The viscoelastic resin is a so-called damping rubber. Damping rubber is also provided on the end faces 56 and 57 of the support shaft 50. Through this damping rubber, it is possible to suppress as early as possible the vibration generated by the integration of the holding member 40, the prism 30, and the support shaft 50 due to being supported by the leaf spring 70. In addition, the damping rubber is easy to maintain its shape with respect to the so-called liquid lubricant and is easy to hold the support shaft 50 at the center positions of the support holes 265 and 275. In addition, the spaces 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 portions become airtight. In addition, the holding member 40, the prism 30, and the integrated member of the holding member 40 can swing relative to the frame 10.

[0051] The leaf spring 70 is a member that functions to restrict the action of connecting the fixing portion, i.e., the frame 10, and the holding member 40 to integrate the holding member 40, the prism 30, and the holding member 40. The leaf spring 70 is provided to extend in the YZ plane, that is, it is provided to extend in the extending 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 provided to be along the lamination direction of the coil 64 and the magnet 61 and not to overlap with the coil 64 and the magnet 61. As Figure 9 shown, the leaf spring 70 has outer portions 76 and 77 formed at both ends, a central portion 73 formed at the center, and wrist portions 760 and 770 connecting the central portions 73 of the outer portions 76 and 77. The two wrist portions 760 and 770 each have a twisted shape. The outer portion 76, the central portion 73, and the outer portion 77 are formed side by side in the Y direction in a manner of extending along the Z direction. For convenience, the portion having the outer portion 76, the central portion 73, and the wrist portion 760 and the portion having the outer portion 77, the central portion 73, and the wrist portion 770 are respectively referred to as leaf spring pieces. The leaf spring 70 is formed symmetrically as a whole with the central portion 73 as the axis of symmetry. In addition, the two leaf spring pieces are formed symmetrically in the Y direction and the Z direction.

[0052] More specifically, the leaf spring 70 is a plate body as a whole, and the central portion 73, and the outer portions 76 and 77 are also flat plate bodies. At the center of the central portion 73, there is a rectangular opening 731. The size of the opening 731 is slightly larger than the size of the convex portion 431 of the holding member 40. The wrist portion 760 has a first cable 761 connecting the front end portions of the central portion 73 and the outer portion 76 to each other and a second cable 762 connecting the rear end portions of the central portion 73 and the outer portion 76 to each other. The wrist portion 770 has a first cable 771 connecting the front end portions of the central portion 73 and the outer portion 77 to each other and a second cable 772 connecting the rear end portions of the central portion 73 and the outer portion 77 to each other.

[0053] 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 opposed to each other, and the respective end portions facing the outside of the two letters extend along the Y direction, are connected to the end portions of the central portion 73 and the outer portions 76 and 77, and the end portions facing the inside extend and are connected to each other along the Y direction.

[0054] The leaf spring 70 is fixed to the holding member 40 in such a manner that the convex portion 431 of the holding member 40 is inserted into the opening 731. The outer portions 76 and 77 of the leaf spring 70 are fixed to the protrusions 432 at the crossing positions of the side plates 16 and 17 of the frame body 10 and the upper plate 13 with each other. The leaf spring 70 is mounted in a state of substantially holding a flat plate. Through the leaf spring 70, the holding member 40 in the frame body 10 is held at a position where its upper surface 43 is opposed to the upper plate 13 of the frame body 10 in parallel (hereinafter, this position is referred to as the initial position).

[0055] In Figure 3 when a current flows through the coil 64 from the FPC 80, due to the electromagnetic action between the coil 64 and the magnet 61, the magnet 61 generates a driving force in the X direction. The magnet 61 is disposed offset rearward in the Z direction with respect to the support shaft 50. Therefore, when the magnet 61 generates a driving force downward in the X direction, the holding member 40 and the prism 30 held therein rotate counterclockwise about the support shaft 50. At this time, through the leaf spring 70, the holding member 40 and the frame body 10 are connected together. Therefore, until the position where the driving force generated in the magnet 61 and the force applied due to the deformation of the leaf spring 70 are balanced, the integrated member of the prism 30, the holding member 40, and the support shaft 50 rotates. As a result, the outgoing light from the prism 30 is emitted in the direction of rotating counterclockwise with respect to the outgoing light in the initial position, and reaches the image sensor 100 via the lens body 9. When the supply of current to the coil 64 stops, due to the restoring force of the leaf spring 70, the integrated member of the prism 30, the holding member 40, and the support shaft 50 rotates clockwise and returns to the initial position.

[0056] When a current flows in the opposite direction through the coil 64, a driving force is generated on the upper side in the X direction on the magnet 61. At the position where the driving force and the applied force are balanced, the integrated component of the prism 30, the holding member 40, and the support shaft 50 rotates clockwise. As a result, the outgoing light from the prism 30 is emitted in the clockwise rotation direction with respect to the outgoing light at the initial position, and reaches the image sensor 100 via the lens body 9. When the current supply to the coil 64 stops, the integrated component of the prism 30, the holding member 40, and the support shaft 50 rotates counterclockwise and returns to the initial position.

[0057] As Figure 10 shown in (A) and (B) of, when the integrated component of the prism 30, the holding member 40, and the support shaft 50 swings about 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 centered on the support shaft 50, so the leaf spring 70 deforms while generating torsion between the central portion 73 and the outer portions 76 and 77.

[0058] The above are the details of this embodiment. According to this embodiment, the following effects can be obtained.

[0059] In this embodiment, in the support shaft 50, both end portions inserted into 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 entire second outer peripheral surface 52 is located on the side closer to the first outer peripheral surface 55 than the support surface 49. Therefore, it is possible to align the reflection surface 32 of the prism 30 placed on the support surface 49 with the center of the outer peripheral surface of the swing axis, that is, the support shaft 50. Therefore, according to this embodiment, it is possible to provide a prism driving device 3 that requires a small space for swinging and is easy to miniaturize.

[0060] In addition, in this embodiment, there is provided a support shaft 50 that supports the holding member 40 so as to be swingable relative to the frame 10, and a leaf spring 70 that connects the frame 10 and the holding member 40. The leaf spring 70 extends and is provided in a plane including the Y direction in which the support shaft 50 extends, that is, the YZ plane. As a result, the holding member 40 that supports the prism 30 can easily return to the initial position by the elastic force of the leaf spring 70. Therefore, according to this embodiment, it is possible to provide a prism driving device 3 that makes it easy for the mounted prism 30 to return to the initial position.

[0061] In addition, in the present embodiment, a support shaft 50 that supports the support and holding member 40, and support bearings 26 and 27 as fixing portions that are disposed at both end positions of the support shaft 50 and support the support shaft 50 so as to be swingable freely within its support holes 265 and 275 are provided. A resin having viscoelasticity is filled between the outer peripheral surface of the support shaft 50 and the inner peripheral surfaces within the support holes 265 and 275 of the support bearings 26 and 27. Due to this resin, impact is difficult to be transmitted to the support shaft 50, that is, difficult to be transmitted to the prism 30 supported by the support shaft 50. Therefore, according to the present embodiment, a prism driving device 3 can be provided that is difficult to transmit impact to the prism 30 even when impact is applied.

[0062] In addition, in the present embodiment, a support shaft 50 fixed to the holding member 40, and support bearings 26 and 27 as fixing portions that support the support shaft 50 so as to be swingable freely within its support holes 265 and 275 are provided. The support shaft 50 is inserted from one end of the support holes 265 and 275, and plates 96 and 97 of a housing 90 as fixing portions block the other end sides of the support holes 265 and 275. The space between the support shaft 50 within the support holes 265 and 275 of the support bearings 26 and 27 and the plates 96 and 97 becomes airtight, and air can be retained in this space, and this 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 does collide, the impact is small. Therefore, according to the present embodiment, a prism driving device 3 can be provided in which the prism 30 and the members that support it, namely the holding member 40 and the support shaft 50, are difficult to move along the support shaft 50 and collide with other parts.

[0063] Furthermore, in the present embodiment, the support bearings 26 and 27 may not be provided, and the support shaft 50 may be directly inserted into 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 thicknesses in the Y direction of the two side plates 16 and 17 of the frame 10 and the through holes 165 and 175 at its center become thicker, the diameters of the through holes 165 and 175 are slightly thicker than the diameter of the support shaft 50, both end portions of the support shaft 50 are inserted into the through holes 165 and 175, a resin having viscoelasticity is filled between the inner peripheral surface of the through holes 165 and 175 and the outer peripheral surface of the support shaft 50, and the outer side surfaces of the side plates 16 and 17 are brought into contact with the inner side surfaces of the plates 96 and 97 of the housing 90 to block the through holes 165 and 175.

[0064] In addition, in the present embodiment, if the leaf spring 70 extends along the extending direction of the support shaft 50, that is, extends on a plane including the Y direction, it is not necessary to be provided along the thickness direction of the housing 10. For example, it may be arranged to extend in a direction parallel to the end face 42. In this case, the central portion 73 and the outer portions 76 and 77 of the leaf spring 70 are arranged to be always juxtaposed in the Y direction. Among them, in the present embodiment, for the leaf spring 70, the outer portions 76 and 77 are mounted on the fixing portion, and the central portion 73 is mounted on the holding member 40, but it may also be that the outer portions 76 and 77 are mounted on the holding member 40 and the central portion 73 is mounted on the fixing portion.

[0065] In addition, in the present embodiment, the members for blocking the support holes 265 and 275 of the support bearings 26 and 27 do not require the plates 96 and 97 of the housing 90. For example, the members for only blocking 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 blocked, but slightly air outlets may be provided.

Claims

1. An optical element driving device, characterized in that, Comprising: A fixing part having a support hole; A holding member having a support part for supporting an optical element; and A support shaft for supporting the holding member, The shape of the support shaft is such that a central portion occupying its extending direction is cut off from an elongated cylindrical shape, leaving a semi-cylindrical shape, and both end portions of the support shaft are cylindrical, Both end portions of the support shaft respectively pass through through-holes of the holding member and are inserted into the support holes of the fixing part, and the support shaft is swingably supported in the support holes, An adhesive is filled between the outer peripheral surface of the support shaft in the through-hole and the inner peripheral surface of the through-hole to fix the holding member and the support shaft, A resin having viscoelasticity is filled between the outer peripheral surface of the support shaft and the inner peripheral surface of the support hole of the fixing part.

2. The optical element driving device according to claim 1, characterized in that, The resin having viscoelasticity is damping rubber.

3. The optical element driving device according to claim 1, characterized in that, The fixing part comprises: a frame body having two opposing side plates; and a support bearing having the support hole and fixed to the frame body, Both end portions of the support shaft are respectively inserted into the support holes of the support bearing, Resin having viscoelasticity is provided between the outer peripheral surface of the support shaft in the support hole of the support bearing and the inner peripheral surface of the support hole and on the end surface of the support shaft.

4. A camera device, characterized in that, Comprising the optical element driving device according to claim 1.

5. An electronic device, characterized in that, Comprising the camera device according to claim 4.

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