JP7325233B2 - Manufacturing method of welded structure and optical unit with anti-shake function - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for manufacturing a welded structure in which a metal ball fixing member and a metal ball are welded together. The present invention also relates to an optical unit with a shake correction function having such a welded structure.

In optical units mounted on mobile terminals or mobile bodies, the movable body on which the optical module is mounted is oscillated around a predetermined axis or rotated to suppress disturbance of captured images when mobile terminals or mobile bodies are moved. Some have a mechanism for correcting shake by rotating. Japanese Patent Application Laid-Open No. 2002-200000 discloses an optical unit with a shake correction function of this type.

The optical unit with a shake correction function disclosed in Patent Document 1 includes a gimbal mechanism that supports a movable body so that it can swing around a predetermined axis. The gimbal mechanism includes a metal rectangular gimbal frame and a connection mechanism that connects the gimbal frame and the movable body so as to be rotatable about an axis. The connection mechanism includes a metal sphere, a sphere fixing portion to which the sphere is fixed, and a sphere support portion having a hemispherical concave portion with which the sphere contacts. The spherical body fixing portion is the inner side surface of a pair of corners of the gimbal frame that face each other in a predetermined axial direction. The sphere is fixed by welding to the inner surface of each corner. The sphere support portions are provided at two locations on the movable body facing the respective sphere fixing portions in a predetermined axial direction.

Japanese Patent Application No. 2015-217432

Here, it is not easy to fix the metal sphere to the metal sphere fixing member with high positional accuracy. For example, when welding a metal sphere to a metal sphere-fixing member, the sphere is pressed against the sphere-fixing member, and the welding laser is irradiated from the side of the sphere to the contact area between the sphere and the sphere-fixing member. do. However, with such a welding method, it is difficult to position the sphere on the member. Therefore, the fixing position of the sphere may deviate from the desired position.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method of manufacturing a welded structure capable of fixing a sphere with high positional accuracy when joining the sphere and a sphere fixing member by welding. Another object of the present invention is to provide an optical unit with a shake correction function having such a welded structure.

In order to solve the above problems, the present invention provides a method for manufacturing a welded structure in which a metal sphere and a metal sphere fixing member are joined by welding, wherein the sphere fixing member has a through hole smaller than that of the sphere. A hole is provided, the sphere is partially inserted into the through hole, the sphere is pressed against the sphere fixing member, and the inside of the through hole is from the opposite side of the sphere fixing member to the side where the sphere is pressed. are irradiated with a plurality of laser beams to simultaneously weld a plurality of linear circular contact portions where the spherical body fixing member and the spherical body are in contact , and a direction perpendicular to a virtual plane containing the circular contact portions. When viewed from above, each laser beam is irradiated in a direction overlapping a tangential line in contact with the circular contact portion .

According to the present invention, during welding, the sphere is partially inserted into the through hole provided in the sphere fixing member. As a result, the sphere fixing member and the sphere have a linear circular contact portion, so that the sphere is supported in a state of being accurately positioned with respect to the sphere fixing member. During welding, the inside of the through-hole is irradiated with a plurality of laser beams to simultaneously weld a plurality of linear circular contact portions where the sphere fixing member and the sphere are in contact with each other. Therefore, the sphere does not shift its position with respect to the sphere fixing member during welding. Therefore, the sphere can be fixed to the sphere fixing member with high positional accuracy. Moreover, by doing so, it becomes easy to dispose each of the plurality of light source devices that irradiate laser light at positions that do not interfere with each other.

A first laser beam directed from a first light source device toward the circular contact portion, and a second laser beam directed toward the circular contact portion from a second light source device arranged on the opposite side of the spherical body from the first light source device. A laser beam may be applied to weld two portions of the circular contact portion separated by 180°. This makes it easy to dispose the first light source device that emits the first laser beam and the second light source device that emits the second laser beam at positions that do not interfere with each other.

In the present invention, each laser beam can be irradiated from a direction perpendicular to a virtual plane containing the circular contact portion. By doing so, it is possible to prevent or suppress the blocking of the laser beams directed to the circular contact portion by the opening edge of the through hole in the spherical body fixing member.

In the present invention, the through hole is provided in the spherical body fixing member by a punching process in which a punch is passed through the spherical body fixing member from the first surface toward the second surface, and the spherical body is removed from the second surface side. It can be inserted into a through hole. In this way, sagging is formed on the opening edge of the through hole on the first surface. That is, the opening edge of the through hole on the first surface has an annular curved surface that is inclined toward the second surface toward the inner peripheral side. Therefore, it is possible to prevent or suppress blocking of the laser beams directed to the circular contact portion by the opening edge of the through hole in the first surface of the spherical body fixing member.

In the present invention, after the punching process, the opening edges of the through holes on the second surface may be ground, and then the spheres may be inserted into the through holes. In this way, if burrs are formed on the opening edges of the through holes on the second surface due to the punching process, the burrs can be removed. Further, the edge of the opening of the through-hole on the second surface can be flattened by polishing. Therefore, when the sphere is partially inserted into the through hole from the second surface side, the sphere is held in the through hole with high positional accuracy.

In the present invention, the sphere is pressed against the sphere fixing member using a jig, and the jig includes a support jig for supporting the sphere fixing member along a predetermined reference plane, and a moving jig that advances and retreats in a direction perpendicular to the reference plane and has a holding portion that holds the ball at the end on the side of the reference plane; and a biasing member that biases the moving jig toward the reference plane. and a movement restricting jig that is detachably fixed to the support jig and restricts movement of the spherical body fixing member from the reference plane in a direction opposite to the movement of the moving jig, and A gap may be provided between an end portion of the sphere opposite to the reference surface and the holding portion when held by the holding portion. In this way, it is easy to press the sphere against the sphere fixing member. In addition, the holding portion prevents the end portion of the sphere on the opposite side from the sphere fixing member from being deformed or adhered with foreign matter.

Next, the present invention provides a movable body having an optical module, supporting the movable body so as to be swingable around a first axis intersecting an optical axis, and moving the movable body between the optical axis and the first axis. a gimbal mechanism that supports the movable body so as to be swingable about a second axis intersecting with the gimbal mechanism; a fixed body that supports the movable body via the gimbal mechanism; and the movable body about the first axis and the second axis. a magnetic drive mechanism for rocking, wherein the gimbal mechanism includes a gimbal frame, a first connection mechanism that connects the movable body and the gimbal frame so as to be rotatable about the first axis, and the fixed body. and a second connection mechanism that connects the gimbal frame and the gimbal frame so as to be rotatable about the second axis, wherein the first connection mechanism includes a metal first sphere and a first sphere to which the first sphere is fixed. A first welded structure including a first metal thrust receiving member including a ball fixing portion and the first ball contacting each other in a first axial direction along the first axis, facing the first ball fixing portion. a first supporting portion having a first concave curved surface, wherein the first welded structure is held by the movable body; the first supporting portion is provided on the gimbal frame; The portion includes a circular first through-hole penetrating the first thrust receiving member in the first axial direction , and the opening edge of the first through-hole on the side of the first surface of the spherical body fixing member The fixing member has a sag formed when the punch is passed through the fixing member from the first surface toward the second surface, and the first sphere partially extends into the first through hole from the second surface side . and the linear circular contact portion where the first spherical body and the inner wall surface of the first through hole in the first thrust receiving member contact the first spherical body, the first thrust receiving member A plurality of first welding marks are provided for fixing to the first surface, and the first welding marks are provided on the circular contact portion from the first surface side .

In the optical unit with a shake correction function of the present invention, the first connection mechanism, which connects the movable body and the gimbal frame so as to be rotatable about the first axis, is joined by welding the first spherical body and the first thrust receiving member to the first connection mechanism. Use a welded structure. In the first connection mechanism, the first spherical body can be fixed to the first thrust receiving member with high positional accuracy, so that the movable body can be rotated about the first axis with high accuracy.

In the present invention, the second connection mechanism includes a second welded structure including a second metal thrust receiving member including a second metal sphere and a second sphere fixing portion to which the second sphere is fixed; a second support portion having a second concave curved surface facing the second ball fixing portion in a second axial direction along the second axis and with which the second ball contacts; is held by the fixed body, the second support portion is provided on the gimbal frame, and the second spherical body fixing portion is a circular second thrust receiving member penetrating in the second axial direction. A through hole is provided, the second spherical body is partially fitted in the second through hole, and the second spherical body and the inner wall surface of the second through hole in the second thrust receiving member are in contact with each other. The linear circular contact portion may be provided with a plurality of second welding marks for fixing the second sphere to the second thrust receiving member. With this configuration, the second welded structure in which the second spherical body and the second thrust receiving member are joined by welding is used in the second connection mechanism that connects the gimbal frame and the fixed body so as to be rotatable about the second axis. . In the second connection mechanism, the second spherical body can be fixed to the second thrust receiving member with high positional accuracy, so that the gimbal frame can be rotated about the second axis with high accuracy.

According to the present invention, when manufacturing a welded structure in which a sphere and a sphere fixing member are joined by welding, the sphere can be fixed with high positional accuracy.

Further, in the optical unit with a shake correction function of the present invention, the first spherical body and the plate-like first thrust receiving member are welded to the first connection mechanism that connects the movable body and the gimbal frame so as to be rotatable about the first axis. A first welded structure is used that is joined by In the first connection mechanism, the first spherical body can be fixed to the first thrust receiving member with high positional accuracy, so that the movable body can be rotated about the first axis with high accuracy.

1 is a perspective view of a welded structure comprising a sphere fixing member and a sphere; FIG. 1 is an exploded perspective view of a welded structure; FIG. 4 is a flow chart of a method for manufacturing a welded structure; 4A and 4B are a perspective view and a cross-sectional view of a jig used in a positioning process and a welding process; FIG. It is explanatory drawing of a welding process. 4 is an enlarged view of a portion of the sphere fixing member and the sphere irradiated with laser light; FIG. FIG. 10 is a perspective view of a state in which a laser beam is irradiated in a welding process, as viewed from the side of the jig; FIG. 4 is a plan view of a jig, viewed from above, in which a laser beam is applied in a welding process; 1 is an external perspective view of an optical unit with a shake correction function to which the present invention is applied; FIG. FIG. 10 is an exploded perspective view of the optical unit with a shake correction function in FIG. 9; FIG. 10 is a plan view of the optical unit with a shake correction function in FIG. 9; 4 is a cross-sectional view of the movable body and the gimbal frame cut along the first axis; FIG. 4 is an exploded perspective view of a gimbal frame, a first gimbal frame receiving member, and a second gimbal frame receiving member; FIG. FIG. 4 is a partial cross-sectional perspective view of the first fulcrum viewed from the inner peripheral side, and an exploded perspective view of the first fulcrum.

Embodiments of a method for manufacturing a welded structure to which the present invention is applied and an optical unit with a shake correction function having the welded structure will be described below with reference to the drawings.

(Welded structure)
FIG. 1 is a perspective view of a welded structure. FIG. 2 is an exploded perspective view of the welded structure. As shown in FIGS. 1 and 2, the welded structure 100 is formed by joining a plate-shaped spherical body fixing member 101 and a spherical body 102 by welding.

The sphere fixing member 101 and the sphere 102 are made of metal. The spherical body fixing member 101 includes a first plate portion 104 having a rectangular shape as a whole. The first plate portion 104 has a first surface 105 located on one side in the thickness direction O and a second surface 106 located on the other side. The first surface 105 and the second surface 106 are parallel. The spherical body fixing member 101 also includes a second plate portion 107 that extends from one end of the first plate portion 104 in the longitudinal direction P to the second surface 106 while being bent at right angles. Furthermore, the first plate portion 104 includes a pair of third plates that extend from both ends in the short direction Q of the other end portion in the longitudinal direction P of the first plate portion 104 while bending at right angles to the second surface 106 side. A unit 108 is provided. The tip of each third plate portion 108 is bent in the direction opposite to the side where the first plate portion 104 is located. Arc-shaped cutouts 109 are provided at positions adjacent to the third plate portion 108 on both edges of the first plate portion 104 in the transverse direction Q, respectively. Here, the longitudinal direction P, the transverse direction Q and the thickness direction O of the spherical body fixing member 101 are directions perpendicular to each other.

In addition, the spherical body fixing member 101 includes a through hole 110 passing through the central portion of the first plate portion 104 in the transverse direction Q in the thickness direction O. As shown in FIG. The through hole 110 is positioned between the second plate portion 107 and the pair of third plate portions 108 in the longitudinal direction P of the first plate portion 104 . An opening edge 110 a of the through hole 110 on the first surface 105 of the spherical body fixing member 101 has a sagging 111 . In other words, the opening edge 110a of the through hole 110 in the first surface 105 of the spherical body fixing member 101 has an annular curved surface that inclines toward the second surface 106 toward the inner peripheral side. The opening edge 110b of the through-hole 110 on the second surface 106 of the spherical body fixing member 101 is polished. As shown in FIG. 2, diameter D1 of through hole 110 is smaller than diameter D2 of sphere 102 .

The sphere 102 is fixed to the first plate portion 104 while being partially fitted into the through hole 110 from the second surface 106 side of the first plate portion 104 . When the ball 102 is fixed to the first plate portion 104 , the other end of the ball 102 in the thickness direction O of the first plate portion 104 is positioned inside the through hole 110 . That is, the sphere 102 does not protrude outward from the first surface 105 of the first plate portion 104 .

The sphere 102 is fixed to the first plate portion 104 by welding. That is, as shown in FIG. 1B, the linear circular contact portion 112 where the first sphere 102 and the inner wall surface of the through hole 110 in the sphere fixing member 101 contact the first sphere 102 is attached to the first plate. A plurality of weld marks 113 for fixing to the portion 104 are provided. In this example, a first weld mark 113(1) and a second weld mark 113(2) are provided at positions spaced apart by 180° in the circumferential direction of the sphere 102 .

(Manufacturing method of welded structure)
Next, a method for manufacturing the welded structure 100 will be described. FIG. 3 is a flow chart of a method for manufacturing the welded structure 100. As shown in FIG. FIG. 4(a) is a perspective view of a jig used in the sphere positioning process and the welding process, and FIG. 4(b) is a sectional view of the jig in FIG. 4(a). FIG. 5 is an explanatory diagram of the welding process. FIG. 6 is an enlarged view of the vicinity of the portion of the sphere fixing member and the sphere irradiated with the laser beam. FIG. 7 is a perspective view of a state in which a laser beam is applied in the welding process, viewed from the side of the jig. FIG. 8 is a plan view of the jig, viewed from above, in which a laser beam is applied in the welding process.

As shown in FIG. 3, the manufacturing method of the welded structure 100 includes a through-hole forming step ST1 in which a through-hole 110 smaller than the sphere 102 is formed in the sphere fixing member 101; a sphere positioning step ST3 of partially inserting the sphere 102 into the through hole 110 and pressing the sphere 102 against the sphere fixing member 101; a welding step ST4 of welding the sphere fixing member 101 and the sphere 102; Prepare.

In the through-hole forming step ST1, a punching process is performed in which a punch penetrates from the first surface 105 of the spherical body fixing member 101 toward the second surface 106 thereof. When punching is performed, as shown in FIG. 1B, a sagging 111 is formed at the opening edge 110a of the through hole 110 in the first surface 105 of the first plate portion 104. As shown in FIG. That is, the opening edge 110a of the through-hole 110 in the first surface 105 has an annular curved surface that inclines toward the second surface 106 toward the inner peripheral side.

Here, if the punching process is performed, burrs may be generated on the opening edge 110a of the through hole 110 in the second surface 106 of the spherical body fixing member 101 . Therefore, in this example, the polishing step ST2 is provided after the through-hole forming step ST1. In the polishing step ST2, as shown in FIG. 2, the opening edges 110b of the through holes 110 on the second surface 106 are polished to remove burrs. In the polishing step ST2, the opening edge 110b of the through-hole 110 on the second surface 106 is polished flat.

In the sphere positioning step ST3, the sphere 102 is pressed against the sphere fixing member 101 using the jig 120 shown in FIG. As shown in FIG. 4A, the jig 120 includes a support jig 121 for supporting the ball fixing member 101 along a predetermined reference plane 120a. The support jig 121 has a flat upper surface 121a as a reference surface 120a. Further, the support jig 121 has a rectangular recess 122 into which the ball fixing member 101 is inserted on the upper surface 121a. Further, the support jig 121 has a jig through-hole 123 vertically passing through the support jig 121 inside the recess 122 . The jig through-hole 123 includes a large-diameter hole portion 123a and a small-diameter hole portion 123b having an inner diameter smaller than that of the large-diameter hole portion 123a.

The jig 120 also includes a moving jig 124 that advances and retreats in a direction orthogonal to the reference plane 120a, and a biasing member 125 that biases the moving jig 124 toward the reference plane 120a. The moving jig 124 has a column portion 126 inserted into the jig through-hole 123 from below. The column portion 126 has a large diameter portion 126a and a small diameter portion 126b having an outer diameter smaller than that of the large diameter portion 126a from the bottom to the top. The large-diameter portion 126 a is located inside the large-diameter hole portion 123 a of the jig through-hole 123 , and the small-diameter portion is located inside the small-diameter hole portion 123 b of the jig through-hole 123 . The column portion 126 is vertically movable within the jig through-hole 123 . A spherical holding portion 127 having a circular concave portion is provided at the upper end portion of the column portion 126 (small diameter portion 126b). The holding portion 127 has a tapered inner peripheral surface 127a that tapers downward. The biasing member 125 is a spring member such as a coil spring. The biasing member 125 is positioned below the column portion 126 .

Further, the jig 120 includes two movement restricting jigs 128 which are detachably fixed to the support jig 121 to restrict the ball fixing member 101 from moving from the reference surface 120a in the direction opposite to the moving jig 124. have.

Each of the two movement restricting jigs 128 has a flat lower end surface. The two movement restricting jigs 128 are fixed on the upper surface 121 a of the support jig 121 at positions facing each other in the longitudinal direction of the recess 122 . When the two movement restricting jigs 128 fixed to the support jig 121 are viewed from above and below, each movement restricting jig 128 has an overlapping portion 128a overlapping the concave portion 122 .

Here, the sphere 102 is placed on the column portion 126 of the moving jig 124 from above and held by the holding portion 127 . As shown in FIG. 4B , when the sphere 102 is held by the holding portion 127 , the upper portion of the sphere 102 protrudes upward from the holding portion 127 . Further, when the spherical body 102 is held by the holding portion 127, the lower end portion of the spherical body 102 and the inner peripheral surface 127a of the holding portion 127 do not come into contact with each other. That is, a gap is provided between the lower end portion of the sphere 102 and the holding portion 127 .

Next, the spherical body fixing member 101 is placed inside the recess 122 with the second plate portion 107 and the third plate portion 108 protruding downward. That is, the ball fixing member 101 is placed in the recess 122 with the first surface 105 facing upward and the second surface 106 facing downward. As shown in FIG. 4B, a sagging 111 is provided on the opening edge 110a of the through-hole 110 on the first surface 105. As shown in FIG. When the ball fixing member 101 is arranged inside the recess 122, the column portion 126 and the through hole 110 of the ball fixing member 101 are coaxially positioned.

Here, the column portion 126 is biased toward the upper surface 121 a of the support jig 121 by the biasing member 125 . Therefore, the sphere 102 held by the column 126 is pressed against the sphere fixing member 101 with its upper end inserted into the through hole 110 of the sphere fixing member 101 . Further, since the column portion 126 is biased toward the upper surface 121 a of the support jig 121 by the biasing member 125 , the spherical body fixing member 101 and the spherical body 102 are lifted upward by the moving jig 124 .

After that, two movement restricting jigs 128 are fixed to the upper surface 121 a of the support jig 121 . When the movement restricting jig 128 is fixed to the support jig 121, the first surface of the first plate portion 104 of the spherical body fixing member 101 abuts from below on the overlapping portion 128a of the movement restricting jig 128 that overlaps the concave portion 122. . As a result, the first surface 105 of the spherical body fixing member 101 is aligned with the upper surface 121 a (reference surface 120 a ) of the support jig 121 . Also, the first surface 105 is positioned on the same plane as the reference surface 120a. Further, the spherical body fixing member 101 is restricted from moving upward from the reference plane 120a by the two movement restricting jigs 128 .

When the sphere 102 is pressed against the sphere fixing member 101 in the jig 120 , the sphere 102 contacts the opening edge 110 a of the through hole 110 in the sphere fixing member 101 . Thereby, the sphere 102 is positioned on the sphere fixing member 101 . In addition, the sphere 102 and the sphere fixing member 101 are provided with a linear circular contact portion 112 that contacts each other.

In the welding step ST4, a plurality of welding laser beams are simultaneously irradiated from above the jig 120 to the inside of the through hole 110 of the spherical body fixing member 101 . As shown in FIG. 5, in this example, the first laser beam 131a and the first laser beam 132a are irradiated at the same time to simultaneously weld two portions of the circular contact portion 112 separated by 180°.

More specifically, the first light source device 131 that emits the first laser beam 131a and the second light source device 132 that emits the first laser beam 132a are positioned above the sphere 102 and the sphere fixing member 101 (the sphere fixing member 101 on the first surface 105 side). Also, the first light source device 131 and the second light source device 132 are arranged on the opposite sides with the sphere 102 interposed therebetween. Then, as shown in FIG. 6, the first laser beam 131a is applied to the first contact portion 112a, which is a portion of the circular contact portion 112 in the circumferential direction. Also, the second laser beam 132a is applied to the second contact portion 112b of the circular contact portion 112, which is separated from the first contact portion 112a by 180°.

Here, as shown in FIG. 7, the optical axis L1 of the first laser beam 131a and the optical axis L2 of the first laser beam 132a are perpendicular to the vertical line (the line perpendicular to the virtual plane including the circular contact portion 112). Tilt 20°. Also, as shown in FIG. 8, the optical axis L1 of the first laser beam 131a and the optical axis L2 of the first laser beam 132a are aligned in a direction that overlaps the tangent line contacting the circular contact portion 112 when viewed from above. be irradiated.

(Action and effect of manufacturing method of welded structure)
According to the manufacturing method of the welded structure 100 of this example, the sphere 102 is partially inserted into the through hole 110 provided in the sphere fixing member 101 during welding. As a result, the spherical body fixing member 101 and the spherical body 102 are provided with the linear circular contact portion 112, so that the spherical body 102 is supported in a state of being accurately positioned with respect to the spherical body fixing member 101. FIG. During welding, a plurality of laser beams are irradiated to the inside of the through hole 110 to simultaneously weld the linear circular contact portions 112 where the spherical body fixing member 101 and the spherical body 102 are in contact with each other. Therefore, the sphere 102 does not shift its position with respect to the sphere fixing member 101 during welding. Therefore, the sphere 102 can be fixed to the sphere fixing member 101 with high positional accuracy.

Further, in the welding step ST4, the first laser beam 131a and the first laser beam 132a are applied in a direction overlapping a tangent line in contact with the circular contact portion 112 when viewed from a direction orthogonal to a virtual plane including the circular contact portion 112. Irradiate. Therefore, the first light source device 131 and the second light source device 132 that emit the first laser light 131a and the first laser light 132a can be arranged at positions that do not interfere with each other.

Furthermore, in the welding process ST4, the first laser light 131a directed from the first light source device 131 toward the circular contact portion 112 and the second light source device arranged on the opposite side of the first light source device 131 with the sphere 102 interposed therebetween A first laser beam 132a directed from 132 toward the circular contact portion 112 is irradiated to weld two portions of the circular contact portion 112 separated by 180°. Therefore, it is easier to dispose the first light source device 131 that emits the first laser beam 131a and the second light source device 132 that emits the first laser beam 132a at positions that do not interfere with each other.

Further, in this example, a through hole 110 is provided in the spherical body fixing member 101 by a punching process in which a punch penetrates from the first surface 105 of the spherical body fixing member 101 toward the second surface 106 , and the spherical body 102 is attached to the second surface 106 . side is inserted into the through hole 110 . Accordingly, a sagging 111 is formed on the opening edge 110 a of the through hole 110 on the first surface 105 . That is, the opening edge 110a of the through-hole 110 in the first surface 105 has an annular curved surface that inclines toward the second surface 106 toward the inner peripheral side. As a result, the first laser light 131a and the first laser light 132a directed toward the circular contact portion 112 can be prevented or suppressed from being blocked by the opening edge 110a of the through hole 110 in the first surface 105 of the spherical body fixing member 101. .

Furthermore, in this example, after the punching process, the opening edge 110a of the through-hole 110 on the second surface 106 is polished, and then the sphere 102 is inserted into the through-hole 110 . As a result, if burrs are generated on the opening edges 110a of the through holes 110 on the second surface 106 due to the punching process, the burrs can be removed. In addition, the opening edge 110a of the through-hole 110 on the second surface 106 can be flattened by polishing. Therefore, when the spherical body 102 is partially inserted into the through hole 110 from the second surface 106 side, the spherical body 102 is held in the through hole 110 with high positional accuracy.

Also, in this example, a gap is provided between the ball 102 and the holding portion 127 of the moving jig 124 . Therefore, when the jig 120 is used to press the sphere 102 against the sphere fixing member 101 , the end portion of the sphere 102 opposite to the sphere fixing member 101 is not deformed.

(Modified example of manufacturing method)
In the through-hole forming step ST1, the through-holes 110 may be formed by a method other than punching. Furthermore, if no burr occurs on the opening edge 110b of the through-hole 110 in the second surface 106 of the spherical body fixing member 101, the polishing step ST2 can be omitted.

Also, in the welding step ST4, the spherical body fixing member 101 and the spherical body 102 may be welded at three or more locations.

Furthermore, in the welding step ST4, the first laser beam 131a and the second laser beam 132a may be irradiated from a direction perpendicular to the virtual plane including the circular contact portion 112. FIG. In this case, the optical axis L1 of the first laser beam 131a and the optical axis L2 of the second laser beam 132a are parallel. Even in this way, the first laser beam 131 a and the second laser beam 132 a directed toward the circular contact portion 112 can be prevented or suppressed from being blocked by the opening edge 110 a of the through hole 110 in the ball fixing member 101 .

Also, the optical axis L1 of the first laser beam 131a and the optical axis L2 of the second laser beam 132a overlap the radius of the circular contact portion 112 when viewed from a direction perpendicular to the virtual plane including the circular contact portion 112. You can irradiate as In this case, the optical axis L1 of the first laser beam 131a and the optical axis L2 of the second laser beam 132a are inclined toward the circular contact portion 112 from the side where the sphere 102 is located. By doing so, it is possible to prevent the first laser beam 131 a and the second laser beam 132 a directed toward the circular contact portion 112 from being blocked by the opening edge 110 a of the through hole 110 in the ball fixing member 101 .

(optical unit with shake correction function)
Next, an optical unit with a vibration correction function including the welded structure 100 described above will be described. FIG. 9 is a perspective view of an optical unit with a shake correction function. 10 is an exploded perspective view of the optical unit with a shake correction function in FIG. 9. FIG. 11 is a plan view of the optical unit with a shake correction function in FIG. 9. FIG. In the description of the optical unit with a shake correction function, three mutually orthogonal axes are the X-axis direction, the Y-axis direction, and the Z-axis direction. One side in the X-axis direction is indicated by +X, the other side is indicated by -X, one side in the Y-axis direction is indicated by +Y, the other side is indicated by -Y, one side in the Z-axis direction is indicated by +Z, and the other side is indicated by -Z. indicated by . The Z-axis direction coincides with the optical axis L direction of the camera module 2 . The +Z direction is one side (subject side) of the optical axis L direction, and the -Z direction is the other side (image side) of the optical axis L direction.

An optical unit 1 with a shake correction function is a camera module 2 having an optical element such as a lens.
have The optical unit 1 with a shake correction function is used, for example, in optical equipment such as camera-equipped mobile phones and drive recorders, and in optical equipment such as action cameras and wearable cameras mounted on mobile objects such as helmets, bicycles, and radio-controlled helicopters. . In such an optical device, if the optical device shakes during shooting, the captured image is disturbed. The optical unit 1 with a shake correction function corrects the inclination of the camera module 2 based on the acceleration, angular velocity, amount of shake, etc. detected by a detection means such as a gyroscope in order to avoid tilting of the photographed image.

As shown in FIGS. 9 to 11, the optical unit 1 with a shake correction function includes a movable body 3 having a camera module 2, a gimbal mechanism 4 supporting the movable body 3 so as to swing, and a gimbal mechanism 4. a fixed body 5 that supports the movable body 3 by means of the fixed body 5; a shake correction drive mechanism 6 that rocks the movable body 3 with respect to the fixed body 5; , a second flexible printed circuit board 8 attached to the fixed body 5 .

The optical unit 1 with a shake correction function performs shake correction by swinging the movable body 3 around two axes that intersect the optical axis L (Z axis) and each other. That is, the optical unit 1 with a shake correction function corrects shake around the X axis and around the Y axis, thereby correcting shake in the pitching (vertical shaking) direction and correcting shake in the yawing (rolling) direction. image stabilization.

As shown in FIG. 9, the movable body 3 is supported by a gimbal mechanism 4 so as to be swingable about a first axis R1 perpendicular to the optical axis L (Z-axis). is pivotally supported around a second axis R2 perpendicular to the . The first axis R1 and the second axis R2 are inclined 45 degrees with respect to the X-axis and the Y-axis. By synthesizing the rotation about the first axis R1 and the rotation about the second axis R2, the movable body 3 can swing about the X axis and the Y axis. Therefore, the movable body 3 is supported by the gimbal mechanism 4 so as to be swingable about the X-axis and the Y-axis.

As shown in FIGS. 10 and 11, the gimbal mechanism 4 includes a gimbal frame 9, first fulcrum portions 41 provided at diagonal positions on the first axis R1 of the movable body 3, and second and a second fulcrum portion 42 provided at a diagonal position on the axis R2. The gimbal frame 9 is a leaf spring made of metal, and includes two first support portions 901 provided at diagonal positions on the first axis R1 and two support portions 901 provided at diagonal positions on the second axis R2. Two second support portions 902 are provided. The gimbal mechanism 4 is assembled so that the first support portion 901 is in point contact with the first fulcrum portion 41 and the second support portion 902 is in point contact with the second fulcrum portion 42 . As a result, the movable body 3 is supported via the gimbal frame 9 so as to be able to swing about the first axis R1, and is also supported so as to be able to swing about the second axis R2.

The first fulcrum portion 41 of the movable body 3 and the first support portion 901 of the gimbal frame 9 constitute a first connection mechanism 47 that supports the movable body 3 rotatably around the first axis R1 in the gimbal mechanism 4. . The second fulcrum portion 42 of the fixed body 5 and the second support portion 902 of the gimbal frame 9 form a second connection mechanism 48 that supports the gimbal frame 9 rotatably about the second axis R2 in the gimbal mechanism 4. Configure.

As shown in FIGS. 9 to 11, the shake correction driving mechanism 6 includes a first magnetic driving mechanism 6X that generates driving force around the X axis for the movable body 3, and a driving force that drives the movable body 3 around the Y axis. It comprises a second magnetic drive mechanism 6Y for generating. The first magnetic drive mechanism 6X is arranged on the -Y direction side of the movable body 3. As shown in FIG. The second magnetic drive mechanism 6Y is arranged on the +X direction side of the movable body 3 .

The first magnetic drive mechanism 6X includes a set of magnets 61X and coils 62X. The second magnetic drive mechanism 6Y comprises a set of magnets 61Y and coils 62Y. The magnet 61X and the coil 62X of the first magnetic drive mechanism 6X face each other in the Y-axis direction. The magnet 61Y and the coil 62Y of the second magnetic drive mechanism 6Y face each other in the X-axis direction. In this example, magnets 61X and 61Y are arranged on the movable body 3, and coils 62X and 62Y are arranged on the fixed body 5. FIG. Alternatively, the magnets 61X and 61Y may be arranged on the fixed body 5 and the coils 62X and 62Y may be arranged on the movable body 3.

(movable body)
FIG. 12 is a cross-sectional view of the movable body 3 and the gimbal frame 9 taken along the first axis R1, and is a cross-sectional view taken along line AA in FIG. As shown in FIGS. 10 and 12 , the movable body 3 has a camera module 2 . The camera module 2 is held by a housing 20 which is an exterior case, a substrate 25 arranged at the end of the housing 20 in the -Z direction, a cylindrical portion 26 protruding from the housing 20 in the +Z direction, and the cylindrical portion 26. A lens group 2A (optical element), a lens driving mechanism 27 arranged inside the housing 20, and an imaging element 28 mounted on a substrate 25 are provided. The imaging element 28 is arranged on the optical axis L of the lens group 2A.

The housing 20 is made of resin. As shown in FIG. 10, the housing 20 has an octagonal planar shape when viewed from the optical axis L direction. The housing 20 has a first side face 21 facing the +X direction, a second side face 22 facing the -X direction, a third side face 23 facing the +Y direction, and a fourth side face 24 facing the -Y direction. A magnet 61Y of the second magnetic drive mechanism 6Y is fixed to the first side surface 21 . Also, the magnet 61X of the first magnetic drive mechanism 6X is fixed to the fourth side surface 24 . A yoke member 63 is fixed to the first side surface 21 and the fourth side surface 24 . The yoke member 63 is a magnetic plate, and the magnets 61Y and 61X are fixed to the outer surface of the housing 20 via the yoke member 63 (magnetic plate). The magnets 61X and 61Y are magnetized in such a way that the magnets on the radially outer side face the magnetization polarization line located substantially at the center in the Z-axis (optical axis L) direction as a boundary.

The housing 20 includes chamfered portions 29A and 29B that are chamfered at diagonal positions in the direction of the first axis R1 and chamfered portions 29C and 29D that are chamfered at diagonal positions in the direction of the second axis R2. The chamfered portion 29A is provided at a corner where the first side surface 21 and the third side surface 23 of the housing 20 are connected, and is inclined at 45° with respect to the +X direction and the +Y direction. Further, the chamfered portion 29B is provided at a corner where the second side surface 22 and the fourth side surface 24 of the housing 20 are connected, and is inclined at 45° with respect to the -X and -Y directions. The housing 20 is provided with a protruding portion 10 that protrudes outward from the chamfered portions 29A and 29B. The projecting portion 10 is formed integrally with the housing 20 . The protrusion 10 has a recess 43 recessed in the -Z direction.

The lens driving mechanism 27 adjusts the lens position of the lens group 2A arranged in the optical axis L direction to focus on the subject. The lens driving mechanism 27 has a magnetic driving mechanism. The lens driving mechanism 27 is arranged on the opposite side of the first magnetic driving mechanism 6X or the second magnetic driving mechanism 6Y with the optical axis L therebetween. In this example, the lens driving mechanism 27 is arranged on the opposite side of the optical axis L from the first magnetic driving mechanism 6X.

The movable body 3 has a first fulcrum portion 41 of the gimbal mechanism 4 . The first fulcrum portions 41 are respectively provided on the two projecting portions 10 provided at diagonal positions in the direction of the first axis R1 of the camera module 2 . The first fulcrum portion 41 includes a recess 43 provided in the projecting portion 10 and a first gimbal frame receiving member 440 arranged in the recess 43 . The first gimbal frame receiving member 440 is a welded structure 100 in which the sphere 102 is welded to the sphere fixing member 101 .

(fixed body)
The fixed body 5 is fixed to the outer surface of the case 50 so as to cover the case 50 made of resin, the coils 62X and 62Y arranged in the coil arrangement holes 56 of the case 50, and the coils 62X and 62Y from the outside in the radial direction. A second flexible printed circuit board 8 is provided. The case 50 is a frame-shaped member that surrounds the outer peripheral side of the movable body 3 . The case 50 includes a first frame portion 51 and a second frame portion 52 extending parallel to the Y-axis direction on the +X direction side and the −X direction side of the movable body 3 , and the +Y direction of the movable body 3 .
It has a third frame portion 53 and a fourth frame portion 54 extending parallel to the X-axis direction on the direction side and the -Y direction side.

The case 50 includes a coil placement hole 56 to which the coil 62X of the first magnetic drive mechanism 6X and the coil 62Y of the second magnetic drive mechanism 6Y are fixed with an adhesive or the like. In this example, the coil placement hole 56 penetrates through the first frame portion 51 and the fourth frame portion 54 . The coils 62X and 62Y are oval air-core coils, and the two long sides located on the +Z direction side and the -Z direction side are used as effective sides. The second flexible printed circuit board 8 is fixed to the case 50 from the radially outer side with respect to the first frame portion 51 and the fourth frame portion 54 . The second flexible printed circuit board 8 has a first board portion 81 that overlaps the coil arrangement hole 56 of the fourth frame portion 54 from the radial direction outside, and a radial direction outside of the coil arrangement hole 56 of the first frame portion 51 . A second substrate portion 82 is provided which overlies from. After the coil 62X is fixed to the first substrate portion 81 and the coil 62Y is fixed to the second substrate portion 82, the second flexible printing is performed so that the coils 62X and 62Y are arranged in the coil arrangement holes 56 of the case 50. A substrate 8 is fixed to the case 50 .

Rectangular magnetic plates 64 are arranged between the first substrate portion 81 and the coil 62X and between the second substrate portion 82 and the coil 62Y, respectively. A magnetic plate 64 disposed between the first substrate portion 81 and the coil 62X faces the magnet 61X and serves as a magnetic spring for returning the movable body 3 to the reference rotational position in the rotational direction around the X axis. Configure. A magnetic plate 64 disposed between the second substrate portion 82 and the coil 62Y faces the magnet 61Y, and is a magnetic plate for returning the movable body 3 to the reference rotational position in the rotational direction around the Y-axis. make up the spring.

The magnetic plate 64 has a rectangular through-hole at a position overlapping the center holes of the coils 62X and 62Y, and the magnetic sensor 65 is arranged in the through-hole. The magnetic sensor 65 is, for example, a Hall element. The optical unit 1 with a shake correction function detects the swing angle of the movable body 3 about the X-axis from the output of the magnetic sensor 65 arranged at the center of the coil 62X. Also, the swing angle of the movable body 3 about the Y-axis is detected from the output of the magnetic sensor 65 arranged at the center of the coil 62Y.

The case 50 includes second fulcrum portions 42 of the gimbal mechanism 4 at two diagonal positions in the direction of the second axis R2. The second fulcrum portion 42 includes a recess 45 that is recessed radially outward on the inner surface of the case 50 and a second gimbal frame receiving member 460 arranged in the recess 45 . The second gimbal frame receiving member 460 is a welded structure 100 in which the sphere 102 is welded to the sphere fixing member 101 .

(gimbal frame)
13 is an exploded perspective view of the gimbal frame 9, the first gimbal frame receiving member 440, and the second gimbal frame receiving member 460. FIG. The gimbal frame 9 includes a substantially square first frame portion 91 when viewed from the Z-axis direction, and a first frame portion 91 that extends in the −Z direction by bending at a substantially right angle from the diagonal position of the first frame portion 91 in the direction of the first axis R1. It has a support extension 93 and a second support extension 94 that bends at a substantially right angle from the diagonal position of the first frame portion 91 in the direction of the second axis R2 and extends in the -Z direction. A central hole 90 is provided in the center of the first frame portion 91 so as to pass through the first frame portion 91 . As shown in FIG. 11, the first frame portion 91 overlaps the housing 20 of the camera module 2 when viewed from the Z-axis (optical axis L) direction.

As shown in FIGS. 9 and 12, the first frame portion 91 has a center portion 911 located in the center in the second axis R2 direction recessed in the −Z direction, and corner portions 912 at both ends in the second axis R2 direction. is located on the +Z direction side of the central portion 911 . That is, in the first frame portion 91, the corner portion 912 in the direction of the second axis R2 is further away from the movable body 3 than the central portion 911 is. Therefore, even when the movable body 3 swings about the first axis R1 on the -Z direction side of the gimbal frame 9 and both ends of the movable body 3 in the second axis R2 direction move in the Z-axis direction, the movable body 3 and the gimbal frame 9 can be avoided.

Also, the central portion 911 extends to the corner portion of the first frame portion 91 in the direction of the first axis R1. Here, the corner portion of the first frame portion 91 in the direction of the first axis R1 swings around the second axis R2 around the second fulcrum portion 42 when the movable body 3 swings around the second axis R2. The gimbal frame 9 is the part that moves the most in the Z-axis (optical axis L) direction.

As shown in FIGS. 10 and 13, the first support extension 93 extends linearly in the −Z direction from the corner of the first frame portion 91 . The first support portion extension portion 93 includes a first support portion 901 having a first concave curved surface 901a at the tip portion thereof. The first concave curved surface 901a is formed by pressing and is recessed radially inward. The first concave curved surface 901 a has a radius of curvature larger than the radius of the first spherical body 444 provided on the first fulcrum portion 41 . In addition, the first support extending portion 93 includes a pair of first notch recesses 93 a formed by notching both end edges in the circumferential direction around the optical axis L in the +Z direction of the first support portion 901 .

As shown in FIGS. 9 and 12, the first support extensions 93 extend in the −Z direction along the chamfers 29A and 29B of the housing 20 on both sides of the camera module 2 in the direction of the first axis R1. A first fulcrum portion 41, which is a fulcrum portion of the gimbal mechanism 4 provided on the movable body 3 side, is disposed on the protruding portion 10 protruding from the chamfered portions 29A and 29B of the housing 20 to the outer peripheral side. A distal end portion of the extension portion 93 is supported by the first fulcrum portion 41 . Thereby, the first connection mechanism 47 is configured, and the movable body 3 and the gimbal frame 9 are connected so as to be rotatable about the first axis R1.

The second support extending portion 94 includes a first portion 941 extending in the -Z direction from a corner of the first frame portion 91 and a second portion bending substantially at right angles from the first portion 941 and extending radially outward. 942, and a third portion 943 bent substantially at right angles from the second portion 942 and extending in the -Z direction. The third portion 943 has a second support portion 902 having a second concave curved surface 902a at its distal end portion. The second concave curved surface 902a is formed by pressing and is recessed radially inward. The second concave curved surface 902 a has a radius of curvature larger than the radius of a second spherical body 464 (described later) provided on the second fulcrum portion 42 . In addition, the second support portion extending portion 94 includes a pair of second notch recesses 94a formed by notching both end edges in the circumferential direction around the optical axis L in the +Z direction of the second support portion 902 . The +Z direction end of the first support extension portion 93 and the Z direction end of the second support extension portion 94 are connected by the first frame portion 91 .

In addition, the first portion 941 of the second support extending portion 94 extends in the -Z direction along the chamfered portions 29C and 29D of the housing 20 on both sides of the camera module 2 in the direction of the second axis R2. The third portion 943 extends in the −Z direction on the outer peripheral side of the first portion 941 . A second fulcrum portion 42, which is a fulcrum portion of the gimbal mechanism 4 provided on the fixed body 5 side, is arranged on the inner surface of the case 50 at a diagonal position with respect to the second axis R2. A distal end portion of the second support portion extension portion 94 is supported by the second fulcrum portion 42 . Thereby, the second connection mechanism 48 is configured, and the fixed body 5 and the gimbal frame 9 are connected so as to be rotatable about the second axis R2.

(Details of first connection mechanism and second connection mechanism)
FIG. 14(a) is a partial cross-sectional perspective view of the first fulcrum portion 41 viewed from the inner peripheral side, and is a cross-sectional perspective view taken along the line BB in FIG. 14B is an exploded perspective view of the first fulcrum portion 41. FIG.

The first connection mechanism 47 includes a first support portion 901 of the gimbal frame 9 and a first fulcrum portion 41 provided on the movable body 3 . As shown in FIGS. 10 and 13 , the first fulcrum portion 41 includes recesses 43 provided in projections 10 projecting outward from the housing 20 on both sides of the camera module 2 in the first axis R1 direction, and recesses 43 provided in the projections 10 . 43 , and a first spherical body 444 fixed to the first spherical body fixing portion 44 a of each first thrust receiving member 44 . The opening edge of the first through hole 443 on the inner peripheral surface of the first plate portion 441 of the first thrust receiving member 44 is the first spherical body fixing portion 44a to which the first spherical body 444 is fixed. The first thrust receiving member 44 and the first spherical body 444 constitute a first gimbal frame receiving member 440 that makes point contact with the first support portion 901 . Each concave portion 43 is an accommodation portion that accommodates the first gimbal frame receiving member 440 .

As shown in FIGS. 11, 12, and 14, the projecting portion 10 includes a wall portion 11 that faces the outer peripheral surface of the housing 20, and connection portions 12 and 13 that connect the wall portion 11 and the housing 20 together. In this example, the protruding portion 10 protruding from the chamfered portion 29A of the housing 20 includes a wall portion 11 extending in the optical axis L direction on the outer peripheral side of the chamfered portion 29A and an end portion of the wall portion 11 in the optical axis L direction (this example Then, the connection portion 12 extending from the −Z direction end) to the inner peripheral side and connected to the −Z direction end of the chamfered portion 29A, and the inner peripheral side from both sides of the wall portion 11 in the circumferential direction around the optical axis L and a pair of connecting portions 13 extending to. Similarly, the protruding portion 10 protruding from the chamfered portion 29B of the housing 20 includes a wall portion 11 extending in the optical axis L direction on the outer peripheral side of the chamfered portion 29B and an end portion of the wall portion 11 in the optical axis L direction (in this example, , −Z direction end) to the inner peripheral side and connected to the −Z direction end of the chamfered portion 29B; and a pair of extending connecting portions 13 .

As shown in FIG. 14(b), the recess 43 is surrounded by the wall portion 11 and the connecting portions 12 and 13. As shown in FIG. The concave portion 43 has a bottom surface 43a extending in the first axis R1 direction, a back surface 43b extending in the +Z direction from the outer peripheral end of the bottom surface 43a, and a pair of side surfaces 43c extending in the +Z direction from both ends of the bottom surface 43a in the circumferential direction around the optical axis L. and stipulated by The bottom surface 43a has a first groove 43d extending in the direction of the first axis R1 with a constant width in a central portion in the circumferential direction. The rear surface 43b has a second groove 43e extending in the Z-axis direction with a constant width in the central portion in the circumferential direction. The first groove 43d and the second groove 43e communicate with each other.

As shown in FIGS. 13 and 14(b), the first thrust receiving member 44 includes a plate-like first plate portion 441 extending in the Z-axis direction, and an end portion of the first plate portion 441 in the -Z direction. A second plate portion 442 that is bent at right angles and extends radially inward, a first through hole 443 that penetrates the first plate portion 441 in the direction of the first axis R1, and an end portion of the first plate portion 441 in the +Z direction. A pair of third plate portions 445 bent substantially at right angles from both sides in the circumferential direction and extending radially inward are provided. The inner peripheral side end portions of the pair of third plate portions 445 are bent in the direction of separating from each other in the circumferential direction. The first through hole 443 is positioned between the second plate portion 442 and the pair of third plate portions 445 in the Z-axis direction.

Here, the first gimbal frame receiving member 440 is the welded structure 100 in which the sphere 102 is welded to the sphere fixing member 101 . The first thrust receiving member 44 is the sphere fixing member 101 in the welded structure 100 , and the first sphere 444 is the sphere 102 in the welded structure 100 . As described with reference to welded structure 100 , diameter D 1 of first through hole 443 is smaller than diameter D 2 of first sphere 444 . The first sphere 444 is fixed to the first plate portion 441 by welding while being partially fitted in the first through hole 443 . In the state where the first spherical body 444 is fixed to the first plate portion 441, as shown in FIG. end) is located inside the first through hole 443 . Therefore, the first spherical body 444 does not protrude from the first plate portion 441 to the outer peripheral side.

As shown in FIG. 14A, when the first gimbal frame receiving member 440 is inserted into the recess 43, the third plate portion 445 of the first thrust receiving member 44 contacts the pair of side surfaces 43c of the recess 43. touch. Thereby, the first fulcrum portion 41 is positioned in the circumferential direction around the optical axis L. As shown in FIG. Further, the second plate portion 442 of the first thrust receiving member 44 contacts the bottom surface 43a of the recess 43, thereby positioning the first fulcrum portion 41 in the Z-axis (optical axis L) direction. The first thrust receiving member 44 is fixed to the recess 43 with an adhesive applied to the first groove 43d and the second groove 43e. When the first thrust receiving member 44 is fixed to the concave portion 43, as shown in FIG. 12, the first spherical body 444 fixed to the first plate portion 441 and the chamfered portions 29A and 29B of the housing 20 are aligned with the first axis R1. facing direction.

When connecting the gimbal frame 9 and the movable body 3, as shown in FIG. 11 and FIG. It is inserted into the inner peripheral side of the receiving member 440 . As a result, the first support portion 901 provided in the first support portion extending portion 93 and the first plate portion 441 of the first thrust receiving member 44 fixed to the movable body 3 are opposed to each other, and the first plate portion 441 is inserted into the first concave surface 901a to bring the first spherical body 444 and the first support portion 901 into point contact. In parallel with this, the pair of third plate portions 445 of the first thrust receiving member 44 are inserted into the pair of first notch recesses 93a of the extension portion 93 for the first support portion. This constitutes the first connection mechanism 47 .

Here, since the first support extension portion 93 is elastically deformable in the direction of the first axis R1, when the first spherical body 444 and the first support portion 901 are brought into contact with each other, the first support extension portion 93 is deformed. The portion 93 is deflected toward the inner periphery and brought into contact. As a result, the first support extending portion 93 is in a state of generating an elastic force toward the outer periphery, and the first support portion 901 elastically contacts the first spherical body 444 from the inner periphery. Therefore, the first sphere 444 is less likely to come off the first support portion 901 . Further, in a state where the first connection mechanism 47 is configured, the second plate portion 442 of the first thrust receiving member 44 and the first support portion extension portion 93 face each other with a gap in the Z-axis direction. .

Next, the second connection mechanism 48 includes a second support portion 902 of the gimbal frame 9 and a second fulcrum portion 42 provided on the fixed body 5 . As shown in FIG. 10 , the second fulcrum portion 42 is the inner surface of the corner where the first frame portion 51 and the fourth frame portion 54 of the case 50 are connected, and the second frame portion 52 and the third frame portion 53 . A recess 45 recessed radially outward in each of the inner surfaces of the corners where the two are connected, a second thrust receiving member 46 arranged in each recess 45, and each second thrust receiving member 46 fixed to the second spherical body fixing portion 46a. and a second sphere 464 . An opening edge portion of the second through hole 463 on the inner peripheral surface of the first plate portion 461 is a second spherical body fixing portion 46a to which the second spherical body 464 is fixed. The second thrust receiving member 46 and the second spherical body 464 constitute a second gimbal frame receiving member 460 that makes point contact with the second support portion 902 . Here, the second gimbal frame receiving member 460 is the welded structure 100 in which the sphere 102 is welded to the sphere fixing member 101 . The second thrust receiving member 46 is the sphere fixing member 101 in the welded structure 100 , and the second sphere 464 is the sphere 102 in the welded structure 100 .

As shown in FIG. 10, each recess 45 has a bottom surface 45a extending in the direction of the second axis R2, a back surface 45b extending in the +Z direction from the outer peripheral end of the bottom surface 45a, and both ends of the bottom surface 45a in the circumferential direction around the optical axis L. and a pair of side surfaces 45c extending in the +Z direction. The bottom surface 45a has a first groove 45d extending in the direction of the second axis R2 with a constant width in the central portion in the circumferential direction. The rear surface 45b has a second groove 45e extending in the Z-axis direction with a constant width in the circumferential central portion. The first groove 45d and the second groove 45e communicate with each other.

As shown in FIGS. 13 and 7, the second thrust receiving member 46 includes a plate-shaped first plate portion 461 extending in the Z-axis direction, and an end portion of the first plate portion 461 in the -Z direction that is bent at a substantially right angle. a second plate portion 462 extending radially inward, a second through hole 463 passing through the first plate portion 461 in the direction of the second axis R2, and an end of the first plate portion 461 in the +Z direction. A pair of third plate portions 465 bent substantially at right angles from both sides and extending radially inward are provided. The ends of the pair of third plate portions 465 on the inner peripheral side are bent in the direction of separating from each other in the circumferential direction. The second through hole 463 is positioned between the second plate portion 462 and the pair of third plate portions 465 in the Z-axis direction.

Here, the diameter D1 of the second through hole 463 is shorter than the diameter D2 of the second sphere 464. As shown in FIG. The second sphere 464 is fixed to the first plate portion 461 by welding while being partially fitted in the second through hole 463 . When the second spherical body 464 is fixed to the second spherical body fixing portion 46a, the end of the second spherical body 464 on the outer peripheral side in the direction of the second axis R2 (the end opposite to the second support portion 902) is the second through hole. Located inside the hole 463 . Therefore, the second spherical body 464 does not protrude from the first plate portion 461 to the outer peripheral side.

When the second gimbal frame receiving member 460 is inserted into the recess 45 of the case 50 , the third plate portion 465 of the second thrust receiving member 46 contacts the pair of side surfaces 45 c of the recess 45 . Thereby, the second fulcrum portion 42 is positioned in the circumferential direction around the optical axis L. As shown in FIG. Further, the second plate portion 462 of the second thrust receiving member 46 contacts the bottom surface 45a of the concave portion 45, thereby positioning the second fulcrum portion 42 in the Z-axis (optical axis L) direction. The second thrust receiving member 46 is fixed to the recess 45 with an adhesive applied to the first groove 45d and the second groove 45e.

When connecting the gimbal frame 9 and the fixed body 5, as shown in FIG. It is inserted between housing 20 and case 50 . As a result, the second support portion 902 provided in the second support portion extending portion 94 and the first plate portion 461 of the second thrust receiving member 46 fixed to the fixed body 5 are opposed to each other. The second spherical body 464 fixed to is inserted into the second concave curved surface 902 a to point-contact the second spherical body 464 and the second support portion 902 . In parallel with this, the pair of third plate portions 465 of the second thrust receiving member 46 are inserted into the pair of second cutout recesses 94a of the extension portion 94 for the second support portion. This constitutes the second connection mechanism 48 .

Here, since the second support portion extension portion 94 is elastically deformable in the direction of the second axis R2, when the second spherical body 464 and the second support portion 902 are brought into contact with each other, the second support portion extension portion 94 is deformed. The portion 94 is deflected toward the inner peripheral side and brought into contact. As a result, the second support extending portion 94 is in a state of generating an elastic force directed toward the outer periphery, and the second support portion 902 elastically contacts the second spherical body 464 from the inner periphery. Therefore, the second sphere 464 is less likely to come off the second support portion 902 . When the second connection mechanism 48 is configured, the second plate portion 462 of the second thrust receiving member 46 and the second support extension portion 94 face each other with a gap in the Z-axis direction. .

According to this example, the first spherical body 444 and the first thrust receiving member 44 are joined by welding to the first connection mechanism 47 that connects the movable body 3 and the gimbal frame 9 so as to be rotatable about the first axis R1. 1 gimbal frame receiving member 440 (welded structure 100) is used. Since the first connecting mechanism 47 can fix the first spherical body 444 to the first thrust receiving member 44 with high positional accuracy, the movable body 3 can be rotated about the first axis R1 with high accuracy.

Further, the end portion of the first sphere 444 opposite to the first thrust receiving member 44 is prevented from being deformed in the sphere positioning step ST for pressing the first sphere 444 against the first thrust receiving member 44 during manufacturing. Therefore, in the first connection mechanism 47, when the first spherical body 444 is supported by the first concave curved surface 901a of the first support portion 901, the deformation of the first spherical body 444 may cause positional deviation. do not have. Therefore, the movable body 3 can be rotated around the first axis R1 with high accuracy.

Further, a first gimbal frame receiver in which a second spherical body 464 and a second thrust receiving member 46 are welded to a second connection mechanism 48 that connects the gimbal frame 9 and the fixed body 5 so as to be rotatable about the second axis R2. Member 460 (welded structure 100) is used. Since the second connecting mechanism 48 can fix the second spherical body 464 to the second thrust receiving member 46 with high positional accuracy, the gimbal frame 9 can be rotated about the second axis R2 with high accuracy.

Further, the end portion of the second sphere 464 opposite to the second thrust receiving member 46 is prevented from being deformed in the sphere positioning step ST3 for pressing the second sphere 464 against the first thrust receiving member 46 during manufacturing. Therefore, in the second connection mechanism 48, when the second spherical body 464 is supported by the second concave curved surface 902a of the second support portion 902, the deformation of the second spherical body 464 may cause positional deviation. do not have. Therefore, the gimbal frame 9 can be accurately rotated around the second axis R2.

1 optical unit with shake correction function 2 camera module 2A lens group 3 movable body 4 gimbal mechanism 5 fixed body 6 drive mechanism for shake correction 6X first magnetic drive mechanism 6Y Second magnetic drive mechanism 8 Second flexible printed circuit board 9 Gimbal frame 10, 10A, 10B, 10C Projection 20 Housing 21 First side 22 Second side 23 Third side surface 24 Fourth side surface 25 Substrate 26 Cylindrical portion 27 Lens drive mechanism 28 Image sensor 29A, 29B, 29C, 29D Chamfered portion 41 First fulcrum 42 Second fulcrum portion 43, 43A... Recessed portion 43a... Bottom surface 43b... Back surface 43c... Side surface 43d... First groove 43e... Second groove 44... First thrust receiving member 44a... First sphere fixing part , 45... Recess 45a... Bottom, 45b... Back, 45c... Side, 45d... First groove, 45e... Second groove, 46... Second thrust receiving member, 46a... Second ball fixing part, 47... First connection Mechanism 48 Second connection mechanism 50 Case 51 First frame 52 Second frame 53 Third frame 54 Fourth frame 56 Coil arrangement hole 61X, 61Y Magnet 62X, 62Y Coil 63 Yoke member 64 Magnetic plate 65 Magnetic sensor 81 First substrate portion 82 Second substrate portion 90 Center hole 91 First frame portion 93, 93A, 93B, 93C... Extending portion for first supporting portion, 93a... First recessed notch, 94... Extending portion for second supporting portion, 94a... Second recessed notch, 100... Welded structure, Reference Signs List 101 Sphere fixing member 102 Sphere 104 First plate 105 First surface 106 Second surface 107 Second plate 108 Third plate 110 Through hole 110a Opening edge 110b Opening edge 111 Sagging 112 Circular contact portion 112a First contact portion 112b Second contact portion 113 Welding mark 120 Jig 120a Reference surface 121 Support Jig 121a Upper surface 122 Recess 123 Jig through-hole 123a Large-diameter hole 123b Small-diameter hole 124 Moving jig 125 Biasing member 126 Column 126a Large-diameter portion 126b Small-diameter portion 127 Holding portion 127a Inner peripheral surface 128 Movement restricting jig 128a Overlapping portion 131 First light source device 131a First laser beam 132 Second second Light source device 132a First laser beam 440 First gimbal frame receiving member 441 First plate portion 442 Second plate portion 443 First through hole 444 First sphere 445 Third Plate portion 460 Second gimbal frame receiving member 461 First plate portion 462 Second plate portion 463 Second through hole 464 Second sphere 901a First concave surface 901 First Supporting portion 902a Second concave curved surface 902 Second supporting portion 911 Central portion 912 Corner portion 941 First portion 942 Second portion 943 Third portion D1 First penetration Diameter of the hole and the second through-hole, D2... Diameter of the first sphere and the second sphere, L... Optical axis, L1... Optical axis of the first laser beam, L2... Optical axis of the second laser beam, R1... First Axis, R2...Second axis

Claims (8)

In a method for manufacturing a welded structure in which a metal sphere and a metal sphere fixing member are joined by welding,
providing a through hole smaller than the sphere in the sphere fixing member;
partially inserting the sphere into the through hole and pressing the sphere against the sphere fixing member;
A plurality of laser beams are irradiated to the inside of the through-hole from the opposite side of the sphere fixing member to the side where the sphere is pressed, and a linear circular shape is formed in which the sphere fixing member and the sphere are in contact with each other. Simultaneously weld multiple points of contact ,
A method for manufacturing a welded structure, wherein each laser beam is irradiated in a direction overlapping a tangent line in contact with the circular contact portion when viewed from a direction orthogonal to a virtual plane including the circular contact portion. A first laser beam directed from a first light source device toward the circular contact portion, and a second laser beam directed toward the circular contact portion from a second light source device arranged on the opposite side of the spherical body from the first light source device. 2. The method of manufacturing a welded structure according to claim 1 , wherein two portions of the circular contact portion separated by 180[deg.] are welded by irradiating a laser beam. 2. The method for manufacturing a welded structure according to claim 1, wherein each laser beam is applied from a direction orthogonal to a virtual plane containing the circular contact portion. providing the through hole in the spherical body fixing member by a punching process in which a punch penetrates from the first surface to the second surface of the spherical body fixing member;
The method for manufacturing a welded structure according to any one of claims 1 to 3, wherein the ball is inserted into the through hole from the second surface side. After the punching process, polishing the opening edge of the through hole on the second surface,
5. The method of manufacturing a welded structure according to claim 4 , further comprising inserting said ball into said through hole after an appropriate time. pressing the sphere against the sphere fixing member using a jig;
The jig includes a support jig for supporting the spherical body fixing member along a predetermined reference plane;
a moving jig that advances and retreats in a direction orthogonal to the reference plane and has a holding portion that holds the sphere at an end on the side of the reference plane; and biases the moving jig toward the reference plane. a biasing member; and a movement restricting jig that is detachably fixed to the support jig and restricts movement of the ball fixing member from the reference surface in a direction opposite to the moving jig;
6. A gap is provided between an end portion of the sphere opposite to the reference surface and the holding portion when the sphere is held by the holding portion. The manufacturing method of the welded structure according to any one of the above. a movable body with an optical module;
A gimbal mechanism that supports the movable body swingably about a first axis that intersects with the optical axis and supports the movable body swingably about a second axis that intersects the optical axis and the first axis. and,
a fixed body that supports the movable body via the gimbal mechanism;
a magnetic drive mechanism for rocking the movable body around the first axis and around the second axis;
has
The gimbal mechanism includes a gimbal frame, a first connection mechanism that connects the movable body and the gimbal frame rotatably about the first axis, and a gimbal frame that connects the fixed body and the gimbal frame about the second axis. a second connection mechanism rotatably connected,
The first connection mechanism includes a first welded structure including a metal first thrust receiving member including a metal first sphere and a first sphere fixing portion to which the first sphere is fixed; a first supporting portion having a first concave curved surface facing the first spherical body fixing portion in a first axial direction along which the first spherical body comes into contact;
The first welded structure is held by the movable body,
The first support portion is provided on the gimbal frame,
The first spherical body fixing portion has a circular first through hole penetrating the first thrust receiving member in the first axial direction,
The opening edge of the first through hole on the side of the first surface of the spherical body fixing member has a sag formed when a punch is passed through the spherical body fixing member from the first surface toward the second surface. ,
The first sphere is partially fitted into the first through hole from the second surface side ,
A linear circular contact portion where the first sphere and the inner wall surface of the first through hole in the first thrust receiving member contact is provided with a first welding for fixing the first sphere to the first thrust receiving member. A plurality of marks are provided ,
The optical unit with a shake correction function , wherein the first welding mark is provided on the circular contact portion from the first surface side . The second connection mechanism includes a second welded structure including a second metal thrust receiving member including a second metal sphere and a second sphere fixing portion to which the second sphere is fixed; a second supporting portion having a second concave curved surface that faces the second spherical body fixing portion in a second axial direction along the second spherical body and contacts the second spherical body;
The second welded structure is held by the stationary body,
The second support is provided on the gimbal frame,
The second spherical body fixing portion has a circular second through hole penetrating the second thrust receiving member in the second axial direction,
The second spherical body is partially fitted in the second through hole,
A second welding for fixing the second sphere to the second thrust receiving member is provided at the linear circular contact portion where the second sphere and the inner wall surface of the second through hole in the second thrust receiving member contact each other. 8. The optical unit with shake correction function according to claim 7 , wherein a plurality of marks are provided.

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