JP7339021B2 - actuator - Google Patents

Description

The present invention relates to an actuator that moves a movable body relative to a fixed body.

Some actuators include a fixed body, a movable body, and a magnetic drive mechanism for driving the movable body, and the movable body and the fixed body are connected by a connecting body. The actuator (linear actuator) of Patent Document 1 includes a spring member that connects the movable body and the fixed body, and a gel-like damper member that is arranged between the movable body and the fixed body. The movable body is movably supported with respect to the fixed body by a spring member. Further, when the movable body vibrates, the gel-like damper member deforms in a crushing direction, so resonance between the spring member and the movable body is suppressed.

JP 2016-032417 A

In Patent Document 1, the spring member that connects the movable body and the fixed body includes an annular fixed body side connecting portion and a plurality of movable body side connecting portions arranged on the outer peripheral side of the fixed body side connecting portion and extending in the circumferential direction. connected by an arm. Since the arm of such a spring member is easily bent, there is a problem that when the movable body vibrates, the movable body moves in a direction different from the vibrating direction due to deviation of the center of gravity of the movable body.

In view of the above problems, an object of the present invention is to suppress movement of the movable body in a direction different from the vibration direction in an actuator that vibrates the movable body with respect to the fixed body.

In order to solve the above problems, an actuator according to the present invention provides a fixed body, a movable body, a magnetic drive mechanism for vibrating the movable body with respect to the fixed body, and a connection between the fixed body and the movable body. a first connection body and a third connection body arranged on one end side of the movable body in the vibration direction, and the connection bodies arranged on the other end side in the vibration direction of the movable body. The first connection body and the second connection body are leaf springs extending in a direction orthogonal to the vibration direction of the movable body, and the leaf spring is the A deformation suppressing portion is provided to suppress movement of the movable body in a direction orthogonal to the vibration direction, the movable body includes a shaft extending in the vibration direction, and the third connection body and the fourth connection body are: The viscoelastic member is a viscoelastic member that connects locations where the movable body and the fixed body are opposed to each other in the vibration direction of the movable body at the center of the movable body in a radial direction about the shaft.

According to the present invention, a leaf spring (a first connecting body and a second connector) is used. Further, the plate springs are arranged at two locations, one end side and the other end side in the vibration direction of the movable body. Therefore, since it is possible to suppress the movement of both ends of the movable body in the direction perpendicular to the vibration direction, it is possible to suppress the movable body from moving in an unintended direction when the movable body is vibrated. As a result, collisions between the movable body and the fixed body can be suppressed, so that the impact resistance of the actuator can be enhanced. Moreover, since the gap between the movable body and the fixed body can be reduced, the degree of freedom in designing the actuator is high, and the size of the actuator can be reduced. Furthermore, by using not only a leaf spring but also a viscoelastic member as a connection body for connecting the movable body and the fixed body, unlike the case where the movable body and the fixed body are connected only by the leaf spring, the movable body can be moved by the viscoelastic member. Excessive vibration of the body can be suppressed. As a result, collisions between the movable body and the fixed body can be suppressed, so that the impact resistance of the actuator can be enhanced. Moreover, since the gap between the movable body and the fixed body can be reduced, the degree of freedom in designing the actuator is high, and the size of the actuator can be reduced.

In the present invention, the movable body includes: a magnet fixed substantially at the center of the shaft in the vibration direction; a first member having a cylindrical portion fitted to the end of the shaft on the one end side in the vibration direction; A first receiving member having a first annular groove in which the tubular portion of the first member fits, and a second member having a tubular portion fitted to the other end of the shaft in the vibration direction. and a second receiving member having a second annular groove in which the cylindrical portion of the second member is fitted, wherein each of the first member and the second member extends from the cylindrical portion to the outer peripheral side. the first connection body is sandwiched between the disk part of the first member and the first receiving member; and the second connection body extends from the second member and the second receiving member, and the fixed body includes a cylindrical case in which the shaft is arranged at the center in the radial direction; a first cover member fixed to the end on the one end side; and a second cover member fixed to the end on the other end side of the tubular case in the vibrating direction; is disposed between the first lid member and the disk portion of the first member, and the fourth connector is disposed between the second lid member and the disk portion of the second member is preferably arranged .

In the present invention, the leaf spring includes an inner annular portion, an outer annular portion disposed on the outer peripheral side of the inner annular portion, and a plurality of arms connecting the inner annular portion and the outer annular portion. , one of the inner annular portion and the outer annular portion is fixed to the movable body, the other of the inner annular portion and the outer annular portion is fixed to the fixed body, and each of the plurality of arms is fixed to the inner annular portion. an inner connecting portion connected to a portion, an outer connecting portion connected to the outer annular portion, and a spiral portion extending from the inner connecting portion toward the outer connecting portion in the circumferential direction, wherein the It is preferable that the deformation suppressing portion is a bent portion provided in the spiral portion. By providing the bent portion in this manner, the rigidity of the arm can be increased. As a result, the rigidity in the direction intersecting the vibrating direction of the leaf spring can be increased. Therefore, it is possible to suppress the movement of the movable body in the direction intersecting with the vibration direction.

In the present invention, the bent portion includes an inclined portion that is inclined with respect to the circumferential direction, a first bent portion that is bent from one end of the inclined portion to one side in the circumferential direction, and a first bent portion that is bent from one end of the inclined portion to one side in the circumferential direction, and It is preferable to have a second bent portion bent to the other side of the. In this way, since the bent portion has a shape that bends within the plane of the plate spring, it is possible to increase the rigidity of the arm in the direction intersecting the vibration direction. Therefore, since the rigidity of the leaf spring can be increased in the direction intersecting the vibration direction, the movement of the movable body in the direction intersecting the vibration direction can be suppressed.

In the present invention, it is preferable that a plurality of the spiral portions provided on the arms different from each other overlap when viewed from the radial direction. In the present invention, each of the plurality of arms extending in the circumferential direction extends to a position where it overlaps with the helical portion of another arm when viewed from the radial direction. Therefore, since a plurality of arms are arranged over the entire range in the circumferential direction, the rigidity of the leaf spring can be increased in all directions intersecting with the vibration direction.

In the present invention, the plurality of arms are a first arm, a second arm arranged on one side of the first arm in the circumferential direction, and one side of the second arm in the circumferential direction. a third arm, wherein each of the first arm, the second arm, and the third arm includes a plurality of the bends provided in the spiral portion; Arms different from each other, comprising a bent portion, a second bent portion positioned on one side of the first bent portion in the circumferential direction, and a third bent portion positioned on the one side of the second bent portion in the circumferential direction It is preferable that the first bent portion, the second bent portion, and the third bent portion provided in the are similar in shape and arranged in a row in this order from the inner peripheral side to the outer peripheral side. . Thus, each of the three arms has three bending portions, so that the rigidity of each arm can be increased. In addition, since the bent portions have similar shapes and are arranged in a line from the inner peripheral side to the outer peripheral side and the positions of the bent portions in the circumferential direction are aligned, the space between the arms is equal to the amount of the bent portions. does not need to be increased. Therefore, the rigidity can be increased without increasing the size of the leaf spring.

In the present invention, in each of the plurality of arms, the inner connecting portion is a protruding portion that protrudes from the inner annular portion toward the outer peripheral side, is connected to the spiral portion in a bent shape, and is connected to the outer connecting portion. is a protruding portion protruding from the outer annular portion to the inner peripheral side, is connected to the spiral portion in a bent shape, and includes the inner connecting portion, the first bent portion, the second bent portion, the second It is preferable that the 3 bent portions and the outer connection portion are arranged in a line in this order from the inner peripheral side to the outer peripheral side. In this way, since the five bent portions are aligned in the circumferential direction, there is no need to increase the distance between the arms by the amount of the bent portions. Therefore, the rigidity can be increased without increasing the size of the leaf spring.

According to the present invention, a leaf spring (a first connecting body and a second connector) is used. Further, the plate springs are arranged at two locations, one end side and the other end side in the vibration direction of the movable body. Therefore, since it is possible to suppress the movement of both ends of the movable body in the direction perpendicular to the vibration direction, it is possible to suppress the movable body from moving in an unintended direction when the movable body is vibrated. As a result, collisions between the movable body and the fixed body can be suppressed, so that the impact resistance of the actuator can be enhanced. Moreover, since the gap between the movable body and the fixed body can be reduced, the degree of freedom in designing the actuator is high, and the size of the actuator can be reduced. Furthermore, by using not only a leaf spring but also a viscoelastic member as a connection body for connecting the movable body and the fixed body, unlike the case where the movable body and the fixed body are connected only by the leaf spring, the movable body can be moved by the viscoelastic member. Excessive vibration of the body can be suppressed. As a result, collisions between the movable body and the fixed body can be suppressed, so that the impact resistance of the actuator can be enhanced. Moreover, since the gap between the movable body and the fixed body can be reduced, the degree of freedom in designing the actuator is high, and the size of the actuator can be reduced.

1 is a cross-sectional view of an actuator according to Embodiment 1 of the present invention; FIG. 2 is an exploded perspective view of the actuator of FIG. 1 as seen from the L1 side; FIG. 2 is an exploded perspective view of the actuator of FIG. 1 as seen from the L2 side; FIG. It is the top view of a 2nd connection body, and its partial enlarged view. FIG. 5 is a cross-sectional view of an actuator according to Embodiment 2 of the present invention;

Embodiments of the present invention will be described below with reference to the drawings. In the following description, the axis L is the central axis of the movable body 3. As shown in FIG. Also, one side in the direction in which the axis L extends (the direction of the axis L) is L1, and the other side in the direction of the axis L is L2.

[Embodiment 1]
(overall structure)
FIG. 1 is a cross-sectional view of an actuator 1 according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the actuator 1 of FIG. 1 viewed from the L1 side. FIG. 3 is an exploded perspective view of the actuator 1 of FIG. 1 as seen from the L2 side. As shown in FIGS. 1 to 3, the actuator 1 of the first embodiment includes a fixed body 2 and a movable body 3, a connection body 8 that connects the fixed body 2 and the movable body 3, and a movable body with respect to the fixed body 2. A magnetic drive mechanism 6 for relatively moving the body 3 in the direction of the axis L is provided. The magnetic drive mechanism 6 includes a magnet 61 arranged on the movable body 3 and a coil 62 arranged on the fixed body 2 . It should be noted that the arrangement of the magnet 61 and the coil 62 can be reversed.

The connection body 8 is an elastic member, and connects the movable body 3 and the fixed body 2 at two points spaced apart in the axis L direction. In this embodiment, as the connection bodies 8, a first connection body 8A arranged at the end of the movable body 3 on the L1 side and a second connection body 8B arranged at the end on the L2 side of the movable body 3 are provided. Moreover, in this embodiment, the first connection body 8A and the second connection body 8B are leaf springs. The first connector 8A has an inner peripheral portion fixed to the end portion of the movable body 3 on the L1 side, and an outer peripheral portion fixed to the fixed body 2 . The second connection body 8B has an inner peripheral portion fixed to the end of the movable body 3 on the L2 side, and an outer peripheral portion fixed to the fixed body 2 . Therefore, the first connection body 8A and the second connection body 8B support the movable body 3 so as to be movable in the axis L direction.

(fixed body)
The fixed body 2 includes a resin case 20 and a holder 4 held by the case 20 . The case 20 includes a tubular case 21, a first lid member 22 fixed to the L1 side end of the tubular case 21, and a second lid member 23 fixed to the L2 side end of the tubular case 21. Prepare. As shown in FIGS. 2 and 3, the cylindrical case 21 has three locking portions 2 protruding from the inner peripheral surface of the end on the L1 side.
5 , and the first lid member 22 has a hook 26 that is locked to the locking portion 25 . Further, the cylindrical case 21 has three hooks 27 protruding from the end on the L2 side, and the second lid member 23 has locking recesses 28 in which the hooks 26 are locked.

The first lid member 22 has a facing surface 221 that faces the end of the movable body 3 on the L1 side in the direction of the axis L. As shown in FIG. As shown in FIG. 3 , the facing surface 221 is a circular surface provided in the radial center of the first lid member 22 . In addition, the outer peripheral portion of the first lid member 22 protrudes toward the holder 4 (L2 side). As shown in FIG. 1 , the outer peripheral portion of the first connecting member 8A is sandwiched between the outer peripheral portion of the first lid member 22 and the holder 4 and fixed to the fixed member 2 .

The second lid member 23 has a facing surface 231 that faces the end of the movable body 3 on the L3 side in the direction of the axis L. As shown in FIG. As shown in FIG. 2 , the facing surface 231 is a circular surface provided in the radial center of the second lid member 23 . As shown in FIG. 3, an annular projecting portion 29 projecting inwardly is provided at the L2 side end portion of the cylindrical case 21 . As shown in FIG. 2, the outer peripheral portion of the second lid member 23 protrudes toward the annular protrusion 29 (L2 side). As shown in FIG. 1, the second connecting body 8B is fixed to the fixed body 2 with its outer peripheral portion sandwiched between the annular projecting portion 29 and the outer peripheral portion of the second lid member 23 .

The holder 4 includes an annular portion 42 arranged on the L2 side of the outer peripheral portion of the first lid member 22 and a coil fixing portion 43 protruding from the inner peripheral portion of the annular portion 42 toward the L2 side. The coil 62 is wound around the outer circumference of the coil fixing portion 43 . The terminal pin 64 protrudes radially outward from the terminal holding portion 44 provided in the annular portion 42 . A substrate 63 that is connected to the coil wire via a terminal pin 64 is fixed to the cylindrical case 21 . The substrate 63 is placed in the recess 24 provided on the outer peripheral surface of the cylindrical case 21 .

(movable body)
The movable body 3 includes a shaft 31 extending in the direction of the axis L at the radial center of the fixed body 2, a magnet 61 fixed substantially in the center of the shaft 31 in the direction of the axis L, and a first yoke overlapping the magnet 61 on the L1 side. 32, a second yoke 33 that overlaps the magnet 61 on the L2 side, a weight 30 that contacts the first yoke 32 from the L1 side, a first receiving member 36 that contacts the weight 30 from the L1 side, and the second yoke 33. A second receiving member 37 abutting from the L2 side is provided. A first member 38 fitted to the L1 side end of the shaft 31 from the L1 side is attached to the L1 side end of the movable body 3 , and the L2 side of the shaft 31 is attached to the L2 side end of the movable body 3 . A second member 39 that fits from the L2 side is attached to the end of the side,

A first annular groove 361 that opens to the L1 side is provided between the first receiving member 36 and the outer peripheral surface of the shaft 31 . The first member 38 includes a cylindrical portion 381 in which the end of the shaft 31 is fitted, and a disk portion 382 that extends outward from the end of the cylindrical portion 381 on the L1 side. It fits in the first annular groove 361 of the member 36 . The disk portion 382 faces the facing surface 221 provided in the radial center of the first lid member 22 in the direction of the axis L. As shown in FIG. The first connector 8A is fixed to the movable body 3 while being sandwiched between the L1-side end of the first receiving member 36 and the inner peripheral portion of the disc portion 382 .

Similarly, a second annular groove 371 is provided between the second receiving member 37 and the outer peripheral surface of the shaft 31 and opens on the L2 side. The second member 39 includes a cylindrical portion 391 to which the end of the shaft 31 is fitted, and a disk portion 392 that extends outward from the L2 side end of the cylindrical portion 391. The cylindrical portion 391 serves as a second receiving It fits in the second annular groove 371 of the member 37 . The disk portion 392 faces the facing surface 231 provided in the radial center of the second lid member 23 in the direction of the axis L. As shown in FIG. The second connector 8B is fixed to the movable body 3 while being sandwiched between the L2-side end of the second receiving member 37 and the inner peripheral portion of the disc portion 392 .

The magnet 61 has a cylindrical shape and is magnetized so as to be polarized into an N pole and an S pole in the axis L direction. The shaft 31 extends in the direction of the axis L at the radial center of the fixed body 2 . A coil fixing portion 43 provided in the holder 4 is arranged coaxially with the magnet 61 on the outer peripheral side of the magnet 61 . Therefore, the magnet 61 and the coil 62 are arranged coaxially.

The first yoke 32 is a magnetic plate whose outside diameter is slightly larger than the outside diameter of the magnet 61 . The outer peripheral surface of the first yoke 32 protrudes radially outward from the outer peripheral surface of the magnet 61 . The first yoke 32 is fixed to the L1 side surface of the magnet 61 by a method such as adhesion. The second yoke 33 is composed of two magnetic plates (first magnetic plate 34 and second magnetic plate 35). The first magnetic plate 34 includes an end plate portion 341 arranged on the L2 side of the magnet 61 and a cylindrical side plate portion 342 extending from the outer edge of the end plate portion 341 to the L1 side. The side plate portion 342 is arranged on the outer peripheral side of the coil fixing portion 43 . The second magnetic plate 35 has a disc shape slightly smaller than the end plate portion 341 of the first magnetic plate 34 . The second magnetic plate 35 is laminated on the end plate portion 341 of the first magnetic plate 34 on the L2 side and welded to the end plate portion 341 . In the second yoke 33, the second magnetic plate 35 is fixed to the surface of the magnet 61 on the L2 side by a method such as adhesion.

(Connector)
4A and 4B are a plan view and a partially enlarged view of the connector 8. FIG. In this embodiment, the first connector 8A and the second connector 8B are the same member. The connection bodies 8 (first connection body 8A, second connection body 8B) are circular leaf springs arranged perpendicular to the axis L (see FIG. 1). When the movable body 3 vibrates in the axis L direction, the connector 8 elastically deforms in the axis L direction. As shown in FIG. 4 , the connector 8 includes an inner annular portion 81 , an outer annular portion 82 , and a plurality of arms 83 arranged between the inner annular portion 81 and the outer annular portion 82 . The inner annular portion 81 is fixed to the movable body 3 and the outer annular portion 82 is fixed to the fixed body 2 . The connection body 8 includes a first arm 83A, a second arm 83B arranged on one side CCW in the circumferential direction with respect to the first arm 83A, and one side CCW in the circumferential direction with respect to the second arm 83B. Three third arms 83C are provided.

The three arms 83 (first arm 83A, second arm 83B, third arm 83C) have an inner connection portion 84 connected to the inner annular portion 81 and an outer connection portion 85 connected to the outer annular portion 82, respectively. , and a spiral portion 86 extending from the inner connecting portion 84 toward the outer connecting portion 85 to one side CCW in the circumferential direction. The inner connecting portion 84 is a protrusion that protrudes from the inner annular portion 81 to the outer peripheral side. The inner connection portion 84 and the spiral portion 86 are connected in a bent shape. Further, the outer connecting portion 85 is a protruding portion that protrudes from the outer annular portion 82 toward the inner peripheral side. The outer connection portion 85 and the spiral portion 86 are connected in a bent shape.

The helical portions 86 of the three arms 83 extend in the circumferential direction over an angle range larger than the angle range for one round (360°). Therefore, when the connector 8 is viewed from the radial direction, the four spiral portions 86 overlap at any angular position. Therefore, since the connection body 8 has four spiral portions 86 arranged in all directions intersecting with the direction of the axis L, the rigidity of the connection body 8 (plate spring) is increased in all directions intersecting with the direction of the axis L. ing.

The helical portion 86 of each arm 83 includes a plurality of circumferentially spaced bends 87 . In this embodiment, the spiral portion 86 of each arm 83 includes a plurality of curved portions 87, a first curved portion 87A closest to the inner connection portion 84 in the circumferential direction, and a CCW on one side of the first curved portion 87A in the circumferential direction. and a third bent portion 87C positioned on one side CCW in the circumferential direction of the second bent portion 87B.

The three bent portions 87 provided on each arm 83 are a slanted portion 871 that is slanted with respect to the circumferential direction, and a slanted portion 871 that is bent from one end of the slanted portion 871 (the end on the outer peripheral side) to the one side CCW in the circumferential direction. It has a first bent portion 872 and a second bent portion 873 bent from the other end (inner peripheral side end) of the inclined portion 871 to the other side CW in the circumferential direction. The first bent portion 87A, the second bent portion 87B, and the third bent portion 87C have similar shapes, and the length of the inclined portion 871 is increasing.

As described above, the bent portion 87 has a shape bent in a plane perpendicular to the direction of the axis L, and thus the rigidity of each arm 83 in the direction perpendicular to the direction of the axis L is high by providing the bent portion 87 . Therefore, the connection body 8 has high rigidity in the direction perpendicular to the axis L direction.

The three arms 83 (first arm 83A, second arm 83B, third arm 83C) are arranged at equal intervals in the circumferential direction. Also, in each arm 83, three bent portions 87 (first bent portion 87A, second bent portion 87B, and third bent portion 87C) are arranged at regular intervals in the circumferential direction. In this embodiment, three arms 83 are arranged at intervals of 120° in the circumferential direction, and each arm 83 has three bending portions 87 (first bending portion 87A, second bending portion 87B, third bending portion 87B, and three bending portions 87). 87C) are arranged at intervals of 120° in the circumferential direction. Furthermore, the inner connecting portion 84 and the first bent portion 87A are arranged at intervals of 120°, and the third bent portion 87C and the outer connecting portion 85 are arranged at intervals of 120°.

With such an arrangement, in the connection body 8, the first bent portion 87A, the second bent portion 87B, and the third bent portion 87C provided on the mutually different arms 83 are arranged in a line from the inner peripheral side to the outer peripheral side. . Furthermore, since the inner connecting portion 84 is arranged on the inner peripheral side of the first bent portion 87A, and the outer connecting portion 85 is arranged on the outer peripheral side of the third bent portion 87C, the five bent portions are arranged from the inner peripheral side to the outer peripheral side. Lined up side by side. The configuration in which five bent portions are arranged in a row from the inner peripheral side to the outer peripheral side is provided at three locations in the connector 8 at equal angular intervals.

(Main effects of Embodiment 1)
As described above, the actuator 1 of Embodiment 1 includes the fixed body 2, the movable body 3, the magnetic drive mechanism 6 for vibrating the movable body 3 with respect to the fixed body 2, and the fixed body 2 and the movable body 3. and a connector for connecting. The connecting bodies are a first connecting body 8A arranged on one end side (L1 side) in the vibration direction (axis L direction) of the movable body 3 and the other end side (L2 side). The first connection body 8A and the second connection body 8B are leaf springs extending in a direction orthogonal to the vibration direction (axis L direction) of the movable body 3, and the first connection body 8A and the second connection body 8B are the movable bodies. 3 is provided with a deformation suppressing portion (a bending portion 87 of the arm 83) that suppresses the movement of the arm 3 in a direction perpendicular to the vibration direction.

The actuator 1 of the first embodiment includes leaf springs (first connecting body 8A and second connecting body 8B) having deformation suppressing portions capable of suppressing movement of the movable body 3 in a direction perpendicular to the vibration direction (axis L direction). support both ends of the movable body 3 in the vibration direction. Therefore, since both ends of the movable body 3 can be suppressed from moving in a direction intersecting the vibration direction (axis L direction), when the movable body 3 is vibrated, the movable body 3 intersects the vibration direction (axis L direction). You can suppress movement in the direction you want. As a result, the collision between the movable body 3 and the fixed body 2 can be suppressed, so that the impact resistance of the actuator 1 can be enhanced. Moreover, since the gap between the movable body 3 and the fixed body 2 can be reduced, the degree of freedom in designing the actuator 1 is high, and the size of the actuator 1 can be reduced. Furthermore, since the movable body 3 is supported using a plate spring which is a thin member, the supporting structure can be made compact. Therefore, the degree of freedom in designing the actuator 1 is high.

In Embodiment 1, the connection body 8 (the first connection body 8A and the second connection body 8B) includes an inner annular portion 81, an outer annular portion 82 arranged on the outer peripheral side of the inner annular portion 81, and an inner annular portion 81 and an outer annular portion 82 , the inner annular portion 81 is fixed to the movable body 3 and the outer annular portion 82 is fixed to the fixed body 2 . Each of the plurality of arms 83 has an inner connection portion 84 connected to the inner annular portion 81, an outer connection portion 85 connected to the outer annular portion 82, and a circumferential direction extending from the inner connection portion 84 to the outer connection portion 85. and a bending portion 87 provided in the spiral portion 86 as a deformation suppressing portion. By providing the bent portion 87 in this manner, the rigidity of the arm 83 can be increased. Thereby, the rigidity of the connector 8 can be increased in the direction intersecting with the vibration direction (the direction of the axis L). Therefore, it is possible to suppress the movement of the movable body 3 in the direction intersecting with the vibration direction (the direction of the axis L).

In the first embodiment, since the fixed body 2 is arranged on the outer peripheral side of the movable body 3, the inner annular portion 81 is fixed to the movable body 3 and the outer annular portion 82 is fixed to the fixed body 2. When adopting a configuration in which the positions of the movable body 3 and the fixed body 2 are interchanged, the inner annular portion 81 may be fixed to the fixed body 2 and the outer annular portion 82 may be fixed to the movable body 3 .

In the first embodiment, the bent portion 87 includes an inclined portion 871 inclined with respect to the circumferential direction, a first bent portion 872 bent from one end of the inclined portion 871 to one side CCW in the circumferential direction, and the other end of the inclined portion 871. It has a second bent portion 873 bent from to the other side CW in the circumferential direction. Thus, by providing the bending portion 87 that bends in a plane orthogonal to the vibration direction (axis L direction) in the middle of the spiral portion 86, the rigidity of the arm 83 is increased in the direction orthogonal to the vibration direction (axis L direction). can increase Therefore, the rigidity of the connection body 8 can be increased in the direction intersecting the vibration direction (axis L direction), and the movement of the movable body 3 in the direction intersecting the vibration direction (axis L direction) can be suppressed.

In the connection body 8 of Embodiment 1, a plurality of spiral portions 86 provided on arms 83 different from each other overlap when viewed from the radial direction. In Embodiment 1, each of the plurality of arms 83 extends to a position in the circumferential direction where the other arm 83 is arranged, and the spiral portions 86 of the plurality of arms 83 overlap when viewed in the radial direction. By arranging the plurality of arms 83 over the entire range in the circumferential direction in this way, the rigidity of the connection body 8 can be increased in all directions intersecting with the vibration direction (the direction of the axis L). Therefore, it is possible to suppress the movement of the movable body 3 in the direction intersecting with the vibration direction (the direction of the axis L).

In the first embodiment, the plurality of bent portions 87 (the first bent portion 87A, the second bent portion 87B, and the third bent portion 87C) have similar shapes and are provided on the arms 83 that are different from each other. 87 are arranged in a line from the inner peripheral side to the outer peripheral side. In this manner, the bent portions 87 are similar in shape and arranged in a line to align the positions in the circumferential direction. Therefore, the rigidity can be increased without increasing the size of the connection body 8 .

The connection body 8 of the first embodiment has a plurality of arms 83, including a first arm 83A, a second arm 83B arranged on one side of the first arm 83A in the circumferential direction, and one side of the second arm 83B in the circumferential direction. It has a third arm 83C arranged on the side. Each of the first arm 83A, the second arm 83B, and the third arm 83C includes a plurality of bent portions 87 provided in the spiral portion 86, and the plurality of bent portions 87 includes the first bent portion 87A and the first It has a second bent portion 87B positioned on one side in the circumferential direction of the bent portion 87A and a third bent portion 87C positioned on one side in the circumferential direction of the second bent portion 87B. The first bent portion 87A, the second bent portion 87B, and the third bent portion 87C provided on the arms 83 different from each other have similar shapes, and are arranged in one row in this order from the inner peripheral side to the outer peripheral side. Lined up. Thus, when each of the three arms 83 has three bending portions 87, the rigidity of each arm 83 is high. In addition, since the bending portions 87 of the arms 83 which are different from each other are arranged in a row from the inner peripheral side to the outer peripheral side, the rigidity of the connection body 8 can be increased in all directions intersecting with the vibration direction. Therefore, it is possible to suppress the movement of the movable body 3 in the direction intersecting with the vibration direction (the direction of the axis L). Further, by making the bent portions 87 similar in shape and arranging them in a line to align the positions in the circumferential direction, it is not necessary to increase the interval between the arms 83 by the amount of the bent portions 87 provided. Therefore, the rigidity can be increased without increasing the size of the connection body 8 .

In the first embodiment, in each of the plurality of arms 83, the inner connecting portion 84 is a protruding portion that protrudes from the inner annular portion 81 toward the outer peripheral side and is connected to the spiral portion 86 in a bent shape. Reference numeral 85 denotes a protruding portion that protrudes from the outer annular portion 82 toward the inner peripheral side and is connected to the spiral portion 86 in a bent shape, and includes an inner connecting portion 84, a first bent portion 87A, a second bent portion 87B, a second bent portion 87B, and a second bent portion 87B. The 3-bent portion 87C and the outer connection portion 85 are arranged in a line in this order from the inner peripheral side to the outer peripheral side. By aligning the positions of the five bent portions in the circumferential direction in this way, it is not necessary to increase the interval between the arms 83 by the amount of the bent portions 87 provided. Therefore, the rigidity can be increased without increasing the size of the connection body 8 .

In the first embodiment, the first connection body 8A and the second connection body 8B are circular leaf springs, but the shape of the leaf springs may be other than circular. For example, it may be rectangular. Further, the material of the leaf spring may be metal or may be other than metal. For example, resin may be used.

[Embodiment 2]
(overall structure)
FIG. 5 is a cross-sectional view of an actuator 1A according to Embodiment 2 of the present invention. Only points different from the first embodiment will be described below, and descriptions of the same points will be omitted. The actuator 1A of the second embodiment includes a fixed body 2 and a movable body 3, a magnetic drive mechanism 6 that vibrates the movable body 3 in the direction of the axis L, and connecting bodies 8 and 7 that connect the fixed body 2 and the movable body 3. Prepare. The connection body 8 is a leaf spring, and the connection body 7 is a viscoelastic member. The actuator 1A includes, as the connecting bodies 8, a first connecting body 8A and a second connecting body 8B. The configurations of the first connector 8A and the second connector 8B are the same as those of the first embodiment. The first connection body 8A and the second connection body 8B support the movable body 3 so as to be movable in the axis L direction.

The connection body 7 is arranged at a position where the movable body 3 and the fixed body 2 face each other in the direction of the axis L, and is sandwiched between the movable body 3 and the fixed body 2 . In this embodiment, as the connection bodies 7, a third connection body 7A arranged at the end of the movable body 3 on the L1 side and a fourth connection body 7B arranged at the end on the L2 side of the movable body 3 are provided. The third connector 7A is arranged between the facing surface 221 of the first lid member 22 and the disc portion 382 of the first member 38 attached to the end of the shaft 31 on the L1 side. The L1-side end of the third connector 7A is fixed to the facing surface 221 by adhesion or the like. Further, the L2-side end of the third connection body 7A is fixed to the disc portion 382 by adhesion or the like. The fourth connector 7B is arranged between the facing surface 231 of the second lid member 23 and the disk portion 392 of the second member 39 attached to the end of the shaft 31 on the L2 side. The L2-side end of the fourth connector 7B is fixed to the facing surface 231 by adhesion or the like. Further, the L1-side end of the fourth connector 7B is fixed to the disc portion 392 by adhesion or the like.

The third connection body 7A and the fourth connection body 7B are columnar gel-like damper members. For example, silicone gel with a penetration of 90 degrees to 110 degrees can be used as the third connector 7A and the fourth connector 7B. The shapes of the third connector 7A and the fourth connector 7B are not limited to cylindrical. For example, the third connection body 7A and the fourth connection body 7B can be rectangular parallelepipeds.

As described above, the actuator 1A of the second embodiment uses not only the plate spring (connector 8) but also the viscoelastic member (connector 7) as the connector that connects the movable body 3 and the fixed body 2. FIG. The viscoelastic member (connector 7) is sandwiched between the movable body 3 and the fixed body 2 in the vibrating direction (the direction of the axis L), so that it functions as a damper member when the movable body 3 vibrates. . Therefore, in the second embodiment, in addition to the effects of the first embodiment, the following effects can be obtained.

The actuator 1A of the second embodiment suppresses excessive vibration of the movable body 3 by the viscoelastic member (connector 7), unlike the case where the movable body 3 and the fixed body 2 are connected only by the plate spring (connector 8). can. Thereby, collision between the movable body 3 and the fixed body 2 can be suppressed, so that the impact resistance of the actuator 1A can be improved. Moreover, the gap between the movable body 3 and the fixed body 2 can be reduced, the degree of freedom in designing the actuator 1A is high, and the size of the actuator 1A can be reduced. Furthermore, it is possible to adjust the resonance frequency of the movable body 3 by adjusting the spring constant and shape of the viscoelastic member.

Reference Signs List 1, 1A Actuator 2 Fixed body 3 Movable body 4 Holder 6 Magnetic drive mechanism 7 Connector 7A Third connector 7B Fourth connector 8 Connector 8A... First connector, 8B... Second connector, 20... Case, 21... Cylindrical case, 22... First cover member, 23... Second cover member, 24... Concave part, 25... Locking part, 26... Hook 27 Hook 28 Retaining recess 29 Annular protrusion 30 Weight 31 Shaft 32 First yoke 33 Second yoke 34 First magnetic plate 35 Second magnetism Plate 36 First receiving member 37 Second receiving member 38 First member 39 Second member 42 Annular portion 43 Coil fixing portion 44 Terminal holding portion 61 Magnet 62 ... coil, 63 ... substrate, 64 ... terminal pin, 70 ... film, 81 ... inner annular portion, 82 ... outer annular portion, 83 ... arm, 83A ... first arm, 83B ... second arm, 83C ... third arm, 84... Inner connecting part 85... Outer connecting part 86... Spiral part 87... Bending part 87A... First bending part 87B... Second bending part 87C... Third bending part 221... Opposite surface 231... Opposing surface 341... End plate part 342... Side plate part 361... First annular groove 371... Second annular groove 381... Cylindrical part 382... Disc part 392... Disc part 391... Cylindrical part, 871... Inclined portion 872... First curved portion 873... Second curved portion CCW... One side in circumferential direction CW... Other side in circumferential direction L... Axis line

Claims (7)

a fixed body;
a movable body;
a magnetic drive mechanism for vibrating the movable body with respect to the fixed body;
a connection body that connects the fixed body and the movable body,
The connection bodies include a first connection body and a third connection body arranged on one end side in the vibration direction of the movable body, and a second connection body and a fourth connection body arranged on the other end side in the vibration direction of the movable body. comprising a connector ,
The first connection body and the second connection body are leaf springs extending in a direction perpendicular to the vibration direction of the movable body,
The leaf spring includes a deformation suppressing portion that suppresses movement in a direction intersecting the vibration direction of the movable body ,
The movable body has a shaft extending in the vibration direction,
The third connecting body and the fourth connecting body are arranged at a location where the movable body and the fixed body are opposed to each other in the vibration direction of the movable body at the center of the movable body in the radial direction about the shaft. An actuator, characterized in that it is a connecting viscoelastic member . The movable body includes a magnet fixed substantially at the center of the shaft in the vibration direction, a first member having a cylindrical portion fitted to an end portion of the shaft on the one end side in the vibration direction, and the first member. a first receiving member having a first annular groove in which the tubular portion of the shaft is fitted; a second member having a tubular portion fitted to the end of the shaft on the other end side in the vibration direction; a second receiving member having a second annular groove in which the cylindrical portions of the two members are fitted;
each of the first member and the second member includes a disk portion extending outward from the cylindrical portion;
The first connecting body is sandwiched between the disc portion of the first member and the first receiving member,
The second connecting body is sandwiched between the disc portion of the second member and the second receiving member,
The fixed body includes a tubular case in which the shaft is arranged at the center in the radial direction, a first lid member fixed to an end portion of the tubular case on the one end side in the vibration direction, and the tubular case. a second lid member fixed to the end of the other end in the vibration direction of the
The third connector is arranged between the first lid member and the disk portion of the first member,
2. The actuator according to claim 1, wherein the fourth connecting body is arranged between the second lid member and the disk portion of the second member. The leaf spring includes an inner annular portion, an outer annular portion disposed on the outer peripheral side of the inner annular portion, and a plurality of arms connecting the inner annular portion and the outer annular portion,
One of the inner annular portion and the outer annular portion is fixed to the movable body, the other of the inner annular portion and the outer annular portion is fixed to the fixed body,
Each of the plurality of arms includes an inner connecting portion connected to the inner annular portion, an outer connecting portion connected to the outer annular portion, and one end extending in the circumferential direction from the inner connecting portion to the outer connecting portion. a sidewardly extending helical portion;
3. The actuator according to claim 1, wherein the deformation suppressing portion is a bent portion provided in the spiral portion. The bent portion includes an inclined portion inclined with respect to the circumferential direction, a first bent portion bent from one end of the inclined portion to one side in the circumferential direction, and from the other end of the inclined portion to the other side in the circumferential direction. 4. The actuator of claim 3, comprising a bent second bent portion. 5. The actuator according to claim 3, wherein a plurality of said spiral portions provided on said arms different from each other overlap when viewed from the radial direction. The plurality of arms includes a first arm, a second arm arranged on one side of the first arm in the circumferential direction, and a third arm arranged on one side of the second arm in the circumferential direction. prepared,
each of the first arm, the second arm, and the third arm includes a plurality of the bending portions provided in the spiral portion;
The plurality of bent portions include a first bent portion, a second bent portion positioned on one side of the first bent portion in the circumferential direction, and a second bent portion positioned on one side of the second bent portion in the circumferential direction. comprising a third bend,
The first bent portion, the second bent portion, and the third bent portion provided on different arms have similar shapes and are arranged in a row in this order from the inner peripheral side to the outer peripheral side. The actuator according to any one of claims 3 to 5, characterized in that: In each of the plurality of arms,
The inner connecting portion is a protruding portion that protrudes from the inner annular portion to the outer peripheral side, and is connected to the spiral portion in a bent shape,
The outer connecting portion is a protruding portion that protrudes from the outer annular portion to the inner peripheral side, and is connected to the spiral portion in a bent shape,
The inner connecting portion, the first curved portion, the second curved portion, the third curved portion, and the outer connecting portion are arranged in a row in this order from the inner peripheral side to the outer peripheral side. The actuator according to claim 6, wherein

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