CN111983773A

CN111983773A - Optical element driving device, camera device, and electronic apparatus

Info

Publication number: CN111983773A
Application number: CN201911220532.5A
Authority: CN
Inventors: 鹫尾纪之
Original assignee: New Shicoh Technology Co Ltd
Current assignee: New Shicoh Motor Co Ltd; New Shicoh Technology Co Ltd
Priority date: 2019-05-22
Filing date: 2019-12-03
Publication date: 2020-11-24
Also published as: CN210864162U; JP6710419B1; JP2020190658A

Abstract

The invention provides an optical component and an optical element driving device, a camera device and an electronic device, wherein the optical component is supported by the optical component and is difficult to move along a supporting shaft and collide with other parts. The prism drive device (3) is provided with a support shaft (50) fixed on a holding member (40), and support bearings (26) and (27) which are fixing parts for supporting the support shaft (50) in a manner of freely swinging in the support holes (265) and (275). The support shaft (50) is fitted into the support holes (265) and (27)5 from one end thereof, and plates (96) and (97) of the housing (90) as fixing portions close the other ends of the support holes (265) and (275). Spaces between the support shaft (50) and the plates (96) and (97) in the support holes (265) and (275) that support the bearings (26) and (27) are air-tight, and air can be trapped in the spaces, and the air can be trapped and function as an air spring.

Description

Optical element driving device, camera device, and electronic apparatus

Technical Field

The present invention relates to an optical element driving device, a camera device, and an electronic device used in an electronic device such as a smartphone.

Background

Some camera devices mounted on electronic devices such as smartphones include a prism for image blur correction and a swingable holding member, and light from an object is guided to an imaging surface of a camera by reflection of the prism. As a document disclosing a technique related to such a camera device, there is patent document 1. The periscopic imaging module described in patent document 1 includes a prism, a prism base having a tapered surface on which the prism is placed, a support shaft inserted into a shaft hole of the prism base, a magnet and a coil that generate a driving force of the prism base, and a frame that supports both ends of the support shaft so as to be swingable. In this periscopic imaging module, the prism base and the prism on the support surface thereof are swung about the support shaft as a swing shaft by the driving forces of the magnet and the coil.

[ Prior art documents ]

[ patent document ]

[ patent document 1 ] Chinese Utility model CN205942054U gazette

Disclosure of Invention

[ problem to be solved by the invention ]

However, the supporting shaft of the periscopic camera module of patent document 1 is fixed to supporting bearings fixed to both left and right side walls of the housing, and the prism base and the prism are supported so as to be swingable with respect to the supporting shaft. Therefore, the prism base and the prism may move along the support shaft toward the side wall of the housing and collide with each other.

The present invention has been made in view of the above problems, and an object thereof is to provide an optical element driving device, a camera device, and an electronic apparatus in which an optical member and a member supporting the optical member are less likely to move along a support shaft and collide with other parts.

[ MEANS FOR SOLVING PROBLEMS ] to solve the problems

In order to solve the above problem, an optical element driving device according to a preferred embodiment of the present invention includes: a holding member having a supporting portion that supports the optical element; a support shaft fixed to the holding member; and a fixing portion configured to support the support shaft so as to be swingable in the support hole, wherein the support shaft is inserted into the support hole from one end thereof, and the other end of the fixing portion closes the other end of the support hole.

In this aspect, a resin material may be filled between the outer peripheral surface of the support shaft and the inner peripheral surface of the support hole.

Further, the fixing body may include: a frame body having a through hole and two side plates facing each other; and a support bearing having the support hole, the support bearing having a cylindrical small diameter portion and a cylindrical large diameter portion having a larger diameter than the small diameter portion, the small diameter portion of the support bearing being inserted into and fixed to the through holes of the two side plates of the frame, and both end portions of the support shaft being fitted in the middle from one end of the support hole of the support bearing.

The fixing body may include a housing having two plates facing each other with the frame interposed therebetween, and covering the device body, end surfaces of the large diameter portions of the support bearings may abut against the plates, respectively, and the abutting portions of the two plates may close the support holes.

A camera device according to another preferred embodiment of the present invention includes the optical element driving device.

An electronic device according to another preferred embodiment of the present invention includes the camera device.

[ Effect of the invention ]

In the present invention, the support shaft is fitted into the support hole from one end thereof, and the other end of the fixing portion closes the other end side of the support hole. The space between the support shaft and the fixing portion in the support hole of the fixing portion is airtight, and air remains in the space, and the air remains to function as an air spring. Thus, even if the support shaft fixed to the holding member moves in the axial direction, the support shaft is less likely to collide with the portion of the fixing portion that closes the other end side of the support hole, and the collision is small even if the collision occurs. Therefore, according to the present invention, it is possible to provide an optical element driving device in which the optical element and the member supporting the optical element are less likely to move along the support shaft and collide with other portions.

Drawings

Fig. 1 is a front view of a smartphone 400 as an electronic device on which a camera device 1 including a prism drive device 3 according to an embodiment of the present invention is mounted.

Fig. 2 is a perspective view of the camera apparatus 1 including the prism drive apparatus 3 of fig. 1.

Fig. 3 is a sectional view taken along line a-a' of fig. 2.

Fig. 4 is a perspective view of the camera apparatus 1 including the prism drive apparatus 3 of fig. 2 viewed from another angle.

FIG. 5 (A) is a sectional view taken along line B-B' of FIG. 4, and (B) is an enlarged view taken within the frame of (A).

Fig. 6 is a perspective view of the prism drive device 3 of fig. 2.

Fig. 7 is a perspective view of the FPC80, the coil 64, the frame 10, the

support bearings

26 and 27, the holding member 40, the support shaft 50, the magnet 61, the plate spring 70, and the prism 30 of fig. 6, viewed from another angle.

Fig. 8 (a) is a view of the support shaft 50 of fig. 6 as viewed from the direction of arrow C, (B) is a view of (a) as viewed from the direction of arrow D, and (C) is a view showing the relationship between the 2 nd outer peripheral surface 52 of the support shaft 50 of (a) and the reflection surface 32 of the prism 30.

Fig. 9 is a view of the plate spring 70 of fig. 6 and 7 as viewed from the direction of arrow E.

Fig. 10 (a) is a diagram showing the appearance of the plate spring 70 when the holding member 40 of the prism drive device 3 of fig. 1 is swung in the counterclockwise direction, and (B) is a diagram showing the appearance of the plate spring 70 when the holding member 40 is swung in the reverse direction.

[ notation ] to show

1 a camera device; 3 prism driving device; 8 a lens driving device; 9 a lens body; 10 a frame body; 13, mounting the plate; 15 a rear plate; 16. 17 side plates; 26. 27 supporting the bearing; 30 prisms; 31 an incident surface; 32 a reflective surface; 34 an exit surface; 36. 37 side surface; 40 a holding member; 41 a solid portion; 42. 56, 57 end faces; 43 an upper surface; 45 behind; 46. 47 wall parts; 48 a support part; 49 a support surface; 50 supporting the shaft; 52, a 2 nd outer peripheral surface; 55, 1 st outer circumferential surface; 61 a magnet; 64 coils; 70 leaf springs; 73 a central portion; 76. 77 outer side portion; 80 FPC; 81, face 1; 82, a 2 nd face; 83 a recess; 90 a housing; 91. 95, 96, 97 plates; 100 an image sensor; 151. 731 opening; 165. 175, 465, 475 through the hole; 261. 271 a small diameter part; 262. 272 large diameter section; 265. 275 support the hole; 400 a smart phone; 424 recess; 425 a recess; 431 a boss; 432 of a protrusion; 561. 571 starting up a vertical surface; 760. 770 wrist portion; 761. 771 No. 1 Cable; 762. 772 the 2 nd cable; a frame body 801; an 802 lens holder; 911. 951 an opening; 912. 952 board; 941 base.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in fig. 1, the camera device 1 is embedded in a corner of the rear surface of the housing of the smartphone 400. The camera device 1 includes a prism 30 and a lens body 9 as optical elements, a prism drive device 3, a lens drive device 8, and an image sensor 100 that photoelectrically converts light introduced from a subject through the prism 30 and the lens body 9.

Hereinafter, the optical axis direction along the optical axis of the lens body 9 is appropriately referred to as the X direction. One direction orthogonal to the X direction and in which light from the subject enters the prism 30 is appropriately referred to as a Z direction, and a direction orthogonal to both the X direction and the Z direction is appropriately referred to as a Y direction. The side of the X direction where the prism 30 exists when viewed from the lens body 9 is referred to as an upper side, and the side of the image sensor 100 opposite to the upper side is referred to as a lower side. The side of the object 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. One direction of the Y direction may be referred to as a left side, and the other direction may be referred to as a right side. The Z direction is a thickness direction of the camera device 1, the prism drive device 3, and the lens drive device 8, and is a thickness direction of a fixing portion described later.

As shown in fig. 2 and 4, the housing 90 of the camera device 1 has a hollow rectangular parallelepiped shape. The lens body 9, the lens driving device 8 for holding the lens body, the prism 30, and the prism driving device 3 for holding the prism are arranged in parallel in the X direction and are housed in a space in the housing 90. The prism drive device 3 is an optical element drive device. The optical element may be a mirror or the like in addition to the prism 30.

As shown in fig. 6, an opening 911 is present in the front plate 91 of the housing 90, and an opening 951 is present in the rear plate 95. The opening 911 allows the lens body 9 to pass therethrough and exposes the incident surface 31 of the prism 30. The lens body 9 is attached to the front opening 911 and the rear opening 951 and the mounting plate 952. In a state where the plate 912 is attached to the opening 911, the prism 30 is exposed forward from an upper portion of the opening 911. A base 941 is fitted into the lower opening of the housing 90. The image sensor 100 has a light receiving surface fixed to the base 941 so as to face the lens body 9. The housing 90 has an upper opening, and a housing 10 of the prism drive device 3, which will be described later, is fitted into and exposed from the upper opening.

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 electric signal given from the substrate of the smartphone 400. As shown in fig. 3, the lens driving device 8 includes 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 a current is supplied to the X-direction driving coil or the Y-direction driving coil of the lens driving device 8, an electromagnetic force is generated in the X-direction driving coil or the Y-direction driving coil, and the lens body 9 moves in the X-direction or the Y-direction against the biasing force of the X-direction spring or the Y-direction spring. 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.

The prism drive device 3 holds the prism 30, and drives the prism 30 around an axis parallel to the Y direction by an electric signal given from the substrate of the smartphone 400. This enables hand shake in the Z direction to be corrected. As shown in fig. 6 and 7, the prism drive device 3 includes an 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 plate spring 70. The FPC80, the coil 64, the frame 10, and the

support bearings

26 and 27 are collectively referred to as a fixing portion including the housing 90.

The FPC80 serves to relay the current supplied from the substrate of the smartphone 400 to the coil 64. The FPC80 has a 1 st face 81 in the shape of a T and a 2 nd face 82 in the shape of a "コ". The 1 st surface portion 81 of the FPC80 is folded back at the connection portion with the 2 nd surface portion 82, and is housed inside the housing 90 with the rear side plate 95 of the housing 90 interposed therebetween. That is, FPC80 is attached to case 90 by sandwiching board 95 on the rear side of case 90 from both sides in the Z direction by way of 1 st surface portion 81 and 2 nd surface portion 82.

A recess 83 recessed rearward is provided at one corner of the front surface of the 1 st surface 81 of the FPC 80. The coil 64 is fixed to the 1 st surface 81 of the FPC 80. The coil 64 has 2 linear portions extending in the X direction and 2 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 1 st surface 81 of the FPC80, and the inner end of the coil 64 is pulled out of the coil 64 through the recess 83 and connected to the 1 st surface 81 of the FPC 80.

Housing 10 is located at a position in case 90 where first surface 81 of FPC80 is covered from the front side. The housing 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. Right circular through

holes

165 and 175 are formed right in the middle between the

side plates

16 and 17. A recess extending in the Z direction is provided in the central rear portion of the upper plate 13, and a protrusion 431 of a holding 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.

The

support bearings

26 and 27 are interposed between the through

holes

165 and 175 and the support shaft 50, support the support shaft 50 so as to be swingable 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 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 the small diameter portions. Support holes 265 and 275 are bored in the centers of the

support bearings

26 and 27, respectively. The support hole 265 penetrates between both end surfaces of the support bearing 26, and the support hole 275 penetrates between both 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 portions 261 and 271, and fixed to the housing 10.

The prism 30, the holding member 40, and the support shaft 50 are integrated into one body, and the holding member 40 is supported by the housing 10 via a plate spring 70 in the housing 10. The prism 30 has an incident surface 31, a reflecting surface 32, an exit surface 34, and two

side surfaces

36 and 37 orthogonal to these in the Y direction. 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 emission surface 34. Light from the incident surface 31 of the object incident prism 30 is reflected by the reflection surface 32 and guided to the lens body 9 through the emission surface 34.

The holding member 40 functions to hold the prism 30. The holding member 40 has a shape in which a triangular prism-shaped portion occupying substantially half of a rectangular parallelepiped extending in the Y direction is cut out. That is, the holding member 40 has an isosceles right triangular prism-shaped solid portion 41, and two

wall portions

46 and 47 extending in an isosceles right triangular shape from the Y-direction end of the solid portion 41 and facing 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 with the solid portions 41 of the

wall portions

46 and 47, respectively.

As shown in fig. 6, an end surface 42 facing the front-lower direction corresponding to the base of the right triangle in the solid portion 41 of the holding member 40 is a tapered surface inclined at substantially 45 degrees with respect to the XY plane and the YZ plane. At each position of the end face 42 separated from the boundary portions between the

wall portions

46 and 47, a semicircular support portion 48 slightly raised from the end face 42 is provided. The support portion 48 is used for mounting the prism 30. The front ends of the four support portions 48 form support surfaces 49, and the support surfaces 49 coincide with the reflection surfaces 32 of the prisms 30. The centers of the support holes 265 and 275 that support the

bearings

26 and 27 coincide as viewed from the Y direction and are included in the support face 49. The support surface 49 is substantially parallel to the end surface 42, and the end surface 42 does not extend beyond and protrude beyond the support surface 49.

A semicircular recess 425 is formed in the end surface 42 of the solid portion 41. The through-hole 465 of the wall portion 46 and the through-hole 475 of the wall portion 47 overlap the recess 425 of the solid portion 41 when viewed in the Y direction. The through

holes

465 and 475 recesses 425 are provided substantially at the center of the end face 42. The support shaft 50, which will be described later, is accommodated and fixed in the through

holes

465 and 475 and the concave portion 425. In addition, four recesses 424 each recessed in a stepped shape are provided in the end surface 42 in order to balance the weight around the support shaft 50 when the prism 30 is attached.

As shown in fig. 3 and 5 (a), a recess for housing and fixing the magnet 61 is provided on the rear surface 45 of the solid portion 42. The magnet 61 functions as a driving unit for driving the holding member 40 together with the coil 64. The rear end surface of the magnet 61 faces the coil 64 with a slight gap therebetween. As shown in fig. 3 and 7, the central portion of the upper surface 43 of the solid portion 41 in the Y direction protrudes upward as a protrusion 431. The boss 431 is fitted into the opening 731 of the plate spring 70.

The support shaft 50 is a member that functions to support the holding member 40 so as to be able to swing. As shown in fig. 8 (a) and 8 (B), the support shaft 50 has a shape in which a central portion occupying the extending direction thereof is cut from an elongated cylindrical shape to leave 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 interval between the

wall portions

46 and 47 opposed in the Y direction in the holding member 40 and shorter than the interval between the

plates

96 and 97 opposed in the Y direction in the housing 90.

Both end portions of the support shaft 50 are cylindrical. The support shaft 50 has a 1 st outer peripheral surface 55 and a 2 nd outer peripheral surface 52 accommodated inside the 1 st outer peripheral surface 55 at a central portion thereof. The 1 st outer peripheral surface 55 is flush with the cylindrical outer peripheral surfaces at both ends along an axis AXS passing through the center O of the cylindrical shape. The center of the 1 st outer peripheral surface 55 is located at the same position as the axis AXS. The 2 nd outer peripheral surface 52 is substantially flat. The 2 nd outer peripheral surface 52 is located more inward than the cylindrical outer peripheral surface. The 2 nd outer peripheral surface 52 is provided at a position which is cut into the inside from the outer periphery of the cylindrical shape of which the 1 st outer peripheral surface 55 forms a part beyond the axis AXS. The 2 nd outer peripheral surface 52 is gently curved at the boundary between the rising

surfaces

571 and 561 at both ends thereof. As shown in fig. 8 (C), the prism 30 is disposed so as to be accommodated in a position that is cut out beyond the axis AXS.

The support shaft 50 is supported such that the 2 nd outer peripheral surface 52 thereof faces the normal direction of the end surface 42 of the holding member 40, and the center portion thereof is fitted into the concave portion 425 of the holding member 40. Both ends of the support shaft 50 in the Y direction are inserted from one ends of the support holes 265 and 275 of the

support bearings

26 and 27 through the through

holes

465 and 475 of the holding member 40. The centers O of the cylindrical shapes of both end portions of the support shaft 50 coincide with the centers of the through

holes

465 and 475 of the holding member 40.

As shown in fig. 5 (B), the inner surface of plate 96 and the inner surface of plate 97 of case 90 face each other in the Y direction across frame 10, and abut against the end surfaces of

large diameter portions

262 and 272 of

support bearings

26 and 27. The inner surfaces of the plate 96 and the plate 97 close the other end sides of the support hole 265 of the support bearing 26 and the support hole 275 of the support bearing 27.

The side surfaces 36 and 37 of the prism 30 on the support surface 49 of the holding member 40 and the

wall portions

46 and 47 of the holding member 40 are fixed by adhesion. Further, a part of the outer peripheral surface of the support shaft 50, which is composed of the 1 st outer peripheral surface 55 and the cylindrical outer peripheral surfaces of both end portions, is fixed to at least one of the through

holes

465 and 475 and the recessed portion 425 of the holding member 40. The 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, thereby fixing the holding member 40 and the support shaft 50. Thereby, the holding member 40, the prism 30, and the support shaft 50 are integrated.

When the holding member 40, the prism 30, and the support shaft 50 are integrated as viewed in the Y direction, the center O of the 1 st outer peripheral surface 55 of the support shaft 50 is positioned on the supporting surface 49 of the holding member 40 and the reflecting surface 32 of the prism 30, and the entire 2 nd outer peripheral surface 52 is positioned on the 1 st outer peripheral surface 55 side with respect to the supporting surface 49 and the reflecting surface 32. That is, since the assembly is performed in parallel with the end face 42, the 2 nd 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 as shown in fig. 8 (C). In addition, even if the 2 nd outer peripheral surface 52 is not parallel to the end surface 42, the 2 nd outer peripheral surface 52 is smaller than the height of the support surface 49 of the holding member 40. Thereby, as shown in fig. 8 (C), a gap GP can be formed between the reflection surface 32 of the prism 30 and the 2 nd outer peripheral surface 52 of the support shaft 50.

As shown in fig. 5 (B), the portions of the support shaft 50 that fit into 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 a resin having viscoelasticity. The resin having viscoelasticity is a so-called cushion rubber. The end surfaces 56 and 57 of the support shaft 50 are also provided with cushion rubber. The cushion rubber can suppress vibration generated by the holding member 40, the prism 30, and the support shaft 50 being integrated by being supported by the plate spring 70 as early as possible. In addition, the cushion rubber is easy to maintain the shape with respect to a so-called liquid lubricant in general, and to hold the support shaft 50 at the center position of the support holes 265 and 275. In addition, the spaces between the end surfaces 56 and 57 of the support shaft 50 and the

plates

96 and 97 of the housing 90 as the fixing portions in the support holes 265 and 275 become airtight. The holding member 40, the prism 30, and the holding member 40 are integrated so as to be swingable with respect to the housing 10.

The plate spring 70 serves to restrict the movement of the holding member 40, the prism 30, and the holding member 40 by coupling the frame 10 and the holding member 40 as the fixed parts. The plate spring 70 extends in the YZ plane, that is, in the extending direction of the support shaft 50 and the thickness direction of the fixed body, that is, the thickness direction of the frame 10. That is, the plate spring 70 is provided along the stacking direction of the coil 64 and the magnet 61 so as not to overlap the coil 64 and the magnet 61. As shown in fig. 9, the plate spring 70 includes

outer portions

76 and 77 formed at both ends, a central portion 73 formed at the center, and arm portions 760 and 770 connecting the

outer portions

76 and 77 and the central portion 73. The two wrist portions 760 and 770 have twisted shapes, respectively. The outer portions 76, the central portion 73, and the outer portions 77 are formed in parallel in the Y direction so as to 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 referred to as plate springs, respectively. The plate spring 70 is formed to be line-symmetrical as a whole with the center portion 73 as a symmetry axis. The two plate springs are formed in line symmetry in the Y direction and the Z direction, respectively.

More specifically, the plate 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 in 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 holding member 40. The arm 760 includes a 1 st cable 761 connecting front ends of the central portion 73 and the outer portion 76 and a 2 nd cable 762 connecting rear ends of the central portion 73 and the outer portion 76, and the arm 770 includes a 1 st cable 771 connecting front ends of the central portion 73 and the outer portion 77 and a 2 nd cable 772 connecting rear ends of the central portion 73 and the outer portion 77.

The 1 st cables 761 and 771 and the 2 nd cables 762 and 772 have the following shapes: the letter "S" is opposed to its mirror image letters, and each end portion facing the outside of the two letters extends in the Y direction, is connected to the end portions of the central portion 73 and the

outer portions

76 and 77, and the end portions facing the inside are connected to each other to extend in the Y direction.

The plate spring 70 is fixed to the holding member 40 so that the projection 431 of the holding member 40 is fitted into the opening 731. The

outer portions

76 and 77 of the plate spring 70 are fixed to projections 432 located at the intersection of the upper plate 13 and the

side plates

16 and 17 of the frame 10. The plate spring 70 is attached in a state of substantially holding a flat plate. The holding member 40 in the housing 10 is held by the plate spring 70 at a position where the upper surface 43 faces the upper plate 13 of the housing 10 in parallel (hereinafter, this position is referred to as an initial position).

In fig. 3, when a current flows from the FPC80 to the coil 64, the magnet 61 generates a driving force in the X direction by an electromagnetic action between the coil 64 and the magnet 61. The magnet 61 is disposed offset to the rear side in the Z direction with respect to the support shaft 50, and therefore when the magnet 61 generates a driving force on the lower side in the X direction, the holding member 40 and the prism 30 held therein rotate in the counterclockwise direction about the support shaft 50. At this time, since the holding member 40 and the housing 10 are coupled together by the plate spring 70, the prism 30, the holding member 40, and the support shaft 50 are rotated to a position where the driving force generated in the magnet 61 and the biasing force caused by the deformation of the plate spring 70 are balanced. Thus, the light emitted from the prism 30 is emitted in a direction rotating counterclockwise with respect to the light emitted from 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 member in which the prism 30, the holding member 40, and the support shaft 50 are integrated is rotated in the clockwise direction by the restoring force of the plate spring 70, and is returned to the initial position.

When a reverse current flows through the coil 64, a driving force is generated on the magnet 61 in the X direction, and the prism 30, the holding member 40, and the support shaft 50 are rotated clockwise to a position where the driving force and the biasing force are balanced. Thus, the light emitted from the prism 30 is emitted in a clockwise direction with respect to the light emitted from the initial position, and reaches the image sensor 100 via the lens body 9. When the supply of the current to the coil 64 is stopped, the member in which the prism 30, the holding member 40, and the support shaft 50 are integrated rotates counterclockwise to return to the initial position.

As shown in fig. 10 (a) and (B), when the prism 30, the holding member 40, and the support shaft 50 are integrated into one, the central portion 73 of the plate spring 70 moves relative to the

outer portions

76 and 77 in the front-rear direction when the support shaft 50 is swung. At this time, strictly, the central portion 73 of the plate spring 70 swings in an arc shape about the support shaft 50, and therefore the plate spring 70 deforms while twisting between the central portion 73 and the

outer portions

76 and 77.

The above is the details of the present embodiment. According to the present embodiment, the following effects can be obtained.

In the present embodiment, the support shaft 50 has cylindrical shape at both ends of the fitting support holes 265 and 275, and has a 1 st outer peripheral surface 55 flush with the cylindrical outer peripheral surface along the cylindrical axis AXS and a 2 nd outer peripheral surface 52 located inside the cylindrical outer peripheral surface at the center portion. The center of the 1 st outer peripheral surface 55 is positioned on the support surface 49, and the entire 2 nd outer peripheral surface 52 is positioned closer to the 1 st outer peripheral surface 55 side than the support surface 49. Therefore, the reflection surface 32 of the prism 30 placed on the support surface 49 can be aligned with the center of the outer peripheral surface of the support shaft 50 as the swing shaft. Therefore, according to the present embodiment, it is possible to provide the prism drive device 3 which requires a small space for swinging and is easy to be downsized.

In the present embodiment, the support shaft 50 that supports the holding member 40 so as to be swingable with respect to the housing 10 and the leaf spring 70 that couples the housing 10 and the holding member 40 are provided. The plate spring 70 extends and is provided on a YZ plane, which is a plane including the Y direction in which the support shaft 50 extends. Thereby, the holding member 40 supporting the prism 30 can be easily returned to the initial position by the elastic force of the plate spring 70. Therefore, according to the present embodiment, it is possible to provide the prism drive device 3 that easily returns the mounted prism 30 to the initial position.

In the present embodiment, the support shaft 50 that supports the holding member 40, and the

support bearings

26 and 27 as fixing portions that support the support shaft 50 in a manner to be swingable with respect to the support holes 265 and 275 in the support holes 265 and 275 are disposed at both end portions of the support shaft 50. Resin having viscoelasticity is filled between the outer peripheral surface of the support shaft 50 and the inner peripheral surfaces of the support holes 265 and 275 of the

support bearings

26 and 27. With this resin, the impact is hard 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 the prism drive device 3 in which even if an impact is applied, the impact is not easily transmitted to the prism 30.

In the present embodiment, the support shaft 50 fixed to the holding member 40 and the

support bearings

26 and 27 as fixing portions for supporting the support shaft 50 in a swingable manner in the support holes 265 and 275 are provided. The support shaft 50 is fitted in the middle from one end of the support holes 265 and 275, and the

plates

96 and 97 of the housing 90 as the fixing portions close the other end sides of the support holes 265 and 275. The spaces 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 become airtight, and air can stay in the spaces, and the air stays to function as air springs. Therefore, the support shaft 50 does not collide with the

plates

96 and 97 even if it moves in the Y direction, and the collision is small even if it collides. Therefore, according to the present embodiment, it is possible to provide the prism drive device 3 in which the prism 30, the holding member 40 that is a member supporting the prism, and the support shaft 50 are less likely to move along the support shaft 50 and collide with other portions.

In the present embodiment, the support shaft 50 may be directly fitted into the through

holes

165 and 175 of the housing 10 without providing the

support bearings

26 and 27. In this case, the penetrating

holes

165 and 175 are regarded as the support holes 265 and 275. The thickness of the two

side plates

16 and 17 and the center through

holes

165 and 175 of the frame 10 in the Y direction is increased, the diameter of the through

holes

165 and 175 is slightly larger than the diameter of the support shaft 50, both ends of the support shaft 50 are inserted into the through

holes

165 and 175, and a viscoelastic resin is filled between the inner circumferential surfaces of the through

holes

165 and 175 and the outer circumferential surface of the support shaft 50, so that 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 case 90, and the through

holes

165 and 175 are closed.

In the present embodiment, if the plate spring 70 is provided to extend along the extending direction of the support shaft 50, i.e., on a plane including the Y direction, it is not necessary to provide the plate spring along the thickness direction of the frame 10. For example, the end face 42 may be provided so as to extend in a direction parallel thereto. In this case, the central portion 73 and the

outer portions

76 and 77 of the plate spring 70 are arranged so as to be always juxtaposed in the Y direction. In the present embodiment, the

outer portions

76 and 77 are attached to the fixing portions and the central portion 73 is attached to the holding member 40 in the plate spring 70, but the

outer portions

76 and 77 may be attached to the holding member 40 and the central portion 73 may be attached to the fixing portions.

In the present embodiment, the

plates

96 and 97 of the housing 90 are not required as members for closing the support holes 265 and 275 for supporting the

bearings

26 and 27. For example, only the members blocking the support holes 265 and 275 may be attached to the

support bearings

26 and 27. Further, the support holes 265 and 275 may be not completely blocked and a slight air overflow port may be provided.

Claims

1. An optical element driving device is characterized by comprising:

a holding member having a supporting portion that supports the optical element;

a support shaft fixed to the holding member; and

A fixing part for supporting the supporting shaft in a freely swinging manner in the supporting hole,

the support shaft is inserted into the support hole from one end thereof, and the other end of the fixing portion closes the other end of the support hole.

2. The optical element driving device according to claim 1,

a resin material is filled between the outer peripheral surface of the support shaft and the inner peripheral surface of the support hole.

3. The optical element driving device according to claim 1,

the fixing body is provided with: a frame body having a through hole and two side plates facing each other; and a support bearing having the support hole,

the support bearing has a cylindrical small diameter portion and a cylindrical large diameter portion having a larger diameter than the small diameter portion,

the small diameter portion of the support bearing is inserted into and fixed to the through holes of the two side plates of the frame,

both ends of the support shaft are inserted into the support holes of the support bearing from one end thereof.

4. An optical element driving device according to claim 3,

the fixing body is provided with a housing which has two plates opposite to each other with the frame body therebetween and covers the device body,

The end faces of the large-diameter portions of the support bearings are abutted against the plates respectively, and the support hole plugs are blocked by the abutted portions of the two plates.

5. A camera device comprising the optical element driving device according to claim 1.

6. An electronic device comprising the camera device according to claim 5.