Patent Publication Number: US-2022224213-A1

Title: Actuator

Description:
TECHNICAL FIELD 
     The present invention relates to an actuator which relatively moves a movable member with respect to a fixed member. 
     BACKGROUND ART 
     An actuator is provided which includes a fixed member, a movable member and a magnetic drive mechanism for vibrating the movable member relative to the fixed member and in which the movable member and the fixed member are connected with a connection member. 
     In the actuator of patent literature 1, a connection member is arranged at a place where a movable member and a fixed member (support member) are opposite each other in a direction orthogonal to the direction of vibration of the movable member. The connection member of patent literature 1 is a gel damper member. When the movable member is vibrated on the fixed member (support member), the gel damper member is deformed in a shearing direction. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: Japanese Unexamined Patent Application Publication No. 2019-13086 
     SUMMARY OF THE INVENTION 
     Problems to be Solved by the Invention 
     In patent literature 1, the connection member (gel damper member) is arranged at a place where a yoke provided in the movable member and a cover member provided in the fixed member (support member) are opposite each other. Although one surface of the gel damper member in the direction of thickness is adhered to the yoke and the other surface is adhered to the cover member, on the outer circumferential side of the gel damper member, gaps are provided over the entire circumference. Hence, when the movable member is vibrated with a magnetic drive mechanism, the movable member can also be moved in the direction orthogonal to the direction of the vibration, with the result that the movable member is disadvantageously moved in an unintended direction. 
     In view of the problem described above, an object of the present invention is to reduce, in an actuator in which a movable member and a fixed member are connected with a connection member, the movement of the movable member in a direction other than the direction of vibration. 
     Means for Solving the Problem 
     In order to solve the problem described above, an actuator according to the present invention includes: a movable member that includes one of a magnet and a coil; a fixed member that includes the other of the magnet and the coil; and a connection member that connects the fixed member and the movable member, the magnet and the coil form a magnetic drive mechanism that vibrates the movable member relative to the fixed member, one of the movable member and the fixed member includes an inner circumferential side part that is arranged on an inner circumferential side of the other of the movable member and the fixed member, the other of the movable member and the fixed member includes an outer circumferential side part that surrounds an outer circumferential side of the inner circumferential side part, the connection member continuously surrounds an entire circumference of the inner circumferential side part and an inner circumferential portion of the connection member is connected to the inner circumferential side part and an outer circumferential portion of the connection member is connected to the outer circumferential side part. 
     In the present invention, the connection member which connects the movable member and the fixed member continuously surrounds the inner circumferential side part provided in the one of the movable member and the fixed member over the entire circumference, the inner circumferential portion of the connection member is connected to the one of the movable member and the fixed member and the outer circumferential portion of the connection member is connected to the other of the movable member and the fixed member. As described above, the connection member is continuously arranged between the movable member and the fixed member, and thus when the movable member is vibrated with the magnetic drive mechanism, the connection member is deformed in a shearing direction whereas when the movable member is moved in a direction other than the direction of the vibration, the connection member is deformed in such a direction that the connection member is collapsed. In this way, as compared with a case where the movable member is vibrated, when the movable member is moved in a direction other than the direction of the vibration, the spring constant of the connection member can be increased, with the result that it is possible to reduce the movement of the movable member in a direction different from the direction of the vibration. Hence, it is possible to reduce the movement of the movable member in an unintended direction, and thus it is possible to reduce the collision of the movable member and the fixed member. 
     In the present invention, the fixed member surrounds an outer circumferential side of the movable member, and the inner circumferential portion of the connection member is connected to the inner circumferential side part provided in the movable member and the outer circumferential portion of the connection member is connected to the outer circumferential side part provided in the fixed member. In this way, when a tactile device is formed in which the movable member is arranged on the inner circumferential side of the fixed member and in which the vibration of the movable member is output through the fixed member to the outside, it is possible to reduce the vibration of the movable member in a direction different from the direction of the vibration, with the result that it is possible to reduce the collision of the movable member and the fixed member. 
     In the present invention, the connection member preferably connects the movable member and the fixed member on one end side and the other end side of the movable member in a direction of the vibration. In this way, both the ends of the movable member in the direction of the vibration are supported with the connection member. Hence, the movable member can be stably supported, and thus it is possible to reduce the movement of the movable member in an unintended direction. 
     In the present invention, the connection member is preferably formed with a gel damper member. As the connection member, a gel damper member such as a silicone gel is used, and thus the spring constant when the connection member is deformed in such a direction that the connection member is collapsed is about three times as high as the spring constant when the connection member is deformed in the shearing direction. Hence, the gel damper member is arranged between the movable member and the fixed member over the entire circumference, and thus it is possible to reduce the movement of the movable member in a direction different from the direction of the vibration. 
     In the present invention, the connection member is preferably cylindrical. In this way, the connection member is uniformly arranged over the entire circumference. Hence, it is possible to cause the spring constant of the connection member to be uniform over the entire circumference. Therefore, the movable member is prevented from being easily moved in a specific direction, and thus it is possible to stably support the movable member. 
     In the present invention, the height of the inner circumferential portion of the connection member is preferably greater than the height of the outer circumferential portion. In this way, an area difference between an area fixed to the inner circumferential portion and an area fixed to the outer circumferential portion can be reduced, and thus the concentration of stress at the inner circumferential portion can be reduced. The concentration of stress at the connection member is reduced, and thus it is possible to increase the allowable range of an amplitude when the movable member is vibrated. Hence, the movable member can be vibrated with a large amplitude. It is also possible to enhance the durability of the connection member. 
     Preferably, in the present invention, the inner circumferential portion is connected to the inner circumferential side part over the entire circumference, and part of the outer circumferential portion in a circumferential direction is connected to the outer circumferential side part. In this way, an area difference between an area fixed to the inner circumferential portion and an area fixed to the outer circumferential portion can be reduced, and thus the concentration of stress at the inner circumferential portion can be reduced. The concentration of stress at the connection member is reduced, and thus it is possible to increase the allowable range of an amplitude when the movable member is vibrated. Hence, the movable member can be vibrated with a large amplitude. It is also possible to enhance the durability of the connection member. 
     Preferably, in the present invention, the connection member is arranged between a cylindrical first member and a cylindrical second member arranged on an outer circumferential side of the first member so as to connect the first member and the second member, the inner circumferential portion is connected through the first member to the inner circumferential side part over the entire circumference and an entire circumference of the outer circumferential portion is connected through the second member to the outer circumferential side part or part of the outer circumferential portion in a circumferential direction is connected through the second member to the outer circumferential side part. As described above, the component obtained by directly molding the gel damper member between the frame member (first member) on the inner circumferential side and the frame member (second member) on the outer circumferential side is manufactured, and thus when the actuator is assembled, the movable member and the fixed member and the gel damper member can be connected through the first member and the second member. Hence, when the actuator is assembled, it is not necessary to provide an operation of adhering the gel damper member and an operational space therefor. Thus, it is possible to efficiently manufacture the actuator. 
     Preferably, in the present invention, the movable member includes an inner annular member arranged on an inner circumferential side of the connection member, the inner annular member is a weight for adjusting mass of the movable member and the inner circumferential side part to which the connection member is fixed is provided in the inner annular member. In a linear actuator in which the movable member and the fixed member are connected with the connection member, as indicated by formula (1) below, the resonance frequency f0 of the movable member is specified by a formula including the mass m of the movable member and the spring constant k of the connection member. 
     
       
         
           
             
               
                 
                   
                     Resonance 
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                     frequency 
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                     f 
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                     0 
                   
                   = 
                   
                     
                       ( 
                       
                         
                           1 
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                           2 
                         
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                       ) 
                     
                     × 
                     
                       √ 
                       
                         ( 
                         
                           k 
                           / 
                           m 
                         
                         ) 
                       
                     
                   
                 
               
               
                 
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     k: spring constant of connection member, m: mass of movable member 
     Hence, the weight is provided in the movable member, and thus the mass m of the movable member is adjusted to be able to set the resonance frequency f0 of the movable member to an appropriate frequency. For example, when the actuator is used as a tactile device, the resonance frequency f0 can be caused to be equal to a frequency for providing a tactile sense desired by a user. The inner annular member to which the connection member is connected is used as the weight, and thus when the mass m of the movable member is adjusted, the outside diameter of the inner annular member is changed to simultaneously change the thickness of the connection member in the radial direction, with the result that the spring constant k of the connection member can be changed. Hence, only by changing the shape of one member (inner annular member), it is possible to simultaneously adjust the two values (k and m) for determining the resonance frequency f0 of the movable member. When the thickness of the connection member in the radial direction is reduced, an area difference between the area of the inner circumferential portion of the connection member fixed to the movable member and the area of the outer circumferential portion of the connection member fixed to the fixed member can be reduced, with the result that the concentration of stress at the inner circumferential portion can be simultaneously reduced. 
     Preferably, in the present invention, the fixed member includes a holder member including a coil fixing portion on which the coil is wound and an outer annular member fixed to the holder member, and the outer circumferential side part to which the connection member is fixed is provided in the outer annular member. In this way, when the coil is arranged in the fixed member, the outer annular member for connecting the connection member and the holder member including the coil fixing portion are used as separate members, with the result that it is not necessary to perform an operation of directly connecting the connection member to the member on which the coil is wound. Hence, it is possible to efficiently perform an operation of assembling the actuator. 
     Effect of the Invention 
     In the present invention, a connection member which connects a movable member and a fixed member continuously surrounds an inner circumferential side part provided in one of the movable member and the fixed member over the entire circumference, the inner circumferential portion of the connection member is connected to the one of the movable member and the fixed member and the outer circumferential portion of the connection member is connected to the other of the movable member and the fixed member. When as described above, the connection member is continuously arranged between the movable member and the fixed member over the entire circumference, and thus the movable member is vibrated with a magnetic drive mechanism, the connection member is deformed in a shearing direction whereas when the movable member is moved in a direction other than the direction of the vibration, the connection member is deformed in such a direction that the connection member is collapsed. In this way, as compared with a case where the movable member is vibrated, when the movable member is moved in a direction other than the direction of the vibration, the spring constant of the connection member can be increased, with the result that it is possible to reduce the movement of the movable member in a direction different from the direction of the vibration. Hence, it is possible to reduce the movement of the movable member in an unintended direction, and thus it is possible to reduce the collision of the movable member and the fixed member. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a cross-sectional view of an actuator according to embodiment 1 of the present invention. 
         FIG. 2  is an exploded cross-sectional perspective view of the actuator of  FIG. 1 . 
         FIG. 3  is an illustrative view of a method for manufacturing a damper member. 
         FIG. 4  is a cross-sectional view of an actuator according to embodiment 2 of the present invention. 
         FIG. 5  is an exploded perspective view when the actuator of  FIG. 4  is seen from an L1 side. 
         FIG. 6  is an exploded perspective view when the actuator of  FIG. 4  is seen from an L2 side. 
         FIG. 7  is a cross-sectional view of an actuator according to embodiment 3 of the present invention. 
         FIG. 8  is an exploded perspective view when the actuator of  FIG. 7  is seen from the L1 side. 
         FIG. 9  is an exploded perspective view when the actuator of  FIG. 7  is seen from the L2 side. 
         FIG. 10  is a perspective view and a side view of the gel damper member of variation 1. 
         FIG. 11  is an illustrative view of the gel damper members of variations 2 and 3. 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     Embodiments of the present invention will be described below with reference to drawings. In the following description, an axis line L refers to the center axis line of a movable member. One side of a direction (direction of the axis line L) in which the axis line L extends is assumed to be L1, and the other side of the direction of the axis line L is assumed to be L2. In an actuator to which the present invention is applied, the movable member is vibrated on a fixed member in the direction of the axis line L. At least part of one of the movable member and the fixed member is arranged on the inner circumferential side of the other. The movable member and the fixed member are connected with a connection member which is continuously arranged over the entire circumference in a gap in a radial direction between the movable member and the fixed member. 
     Although in embodiments 1 to 3 below, a description will be given using, as an example, a form in which the fixed member surrounds the outer circumferential side of the movable member, in which the inner circumferential portion of the connection member is connected to the movable member and in which the outer circumferential portion of the connection member is connected to the fixed member, the present invention is also applicable to a configuration in which the arrangements of the movable member and the fixed member are replaced with each other such that the movable member surrounds the outer circumferential side of the fixed member. Although in embodiments 1 to 3, the movable member is connected to the fixed member with the connection member at two places on one side (L1 side) of the direction of the axis line L and on the other side (L2 side), in the present invention, a form in which the connection member is arranged at one or three or more places may be adopted. Furthermore, although in embodiments 1 to 3, a magnetic drive mechanism for vibrating the movable member relative to the fixed member includes a magnet arranged in the movable member and a coil arranged in the fixed member, in the present invention, it is also possible to adopt a configuration in which the arrangements of the magnet and the coil are reversed. 
     In the present invention, the connection member is a gel damper member which is continuously arranged over the entire circumference in the gap in the radial direction between the movable member and the fixed member. Hence, when the movable member is vibrated in the direction of the axis line L, the gel damper member is deformed in a shearing direction whereas when the movable member is moved in a direction (that is, the radial direction) different from the direction of the vibration (direction of the axis line L), the gel damper member is deformed in such a direction that the gel damper member is collapsed. 
     Hence, when the movable member is about to be moved in the direction different from the direction of the vibration (direction of the axis line L), since the spring constant of the gel damper member is about three times as high as the spring constant when the movable member is vibrated in the direction of the axis line L, the movable member is unlikely to be moved in the direction different from the direction of the vibration (direction of the axis line L). 
     Embodiment 1 
     Overall Configuration 
       FIG. 1  is a cross-sectional view of an actuator  1  according to embodiment 1 of the present invention.  FIG. 2  is an exploded cross-sectional perspective view of the actuator  1  of  FIG. 1 . As shown in  FIGS. 1 and 2 , the actuator  1  includes a fixed member  2 , a movable member  3 , a damper member  10  which connects the fixed member  2  and the movable member  3  and a magnetic drive mechanism  6  which relatively moves the movable member  3  in the direction of the axis line L with respect to the fixed member  2 . The magnetic drive mechanism  6  includes a magnet  61  and a coil  62 . The magnet  61  is arranged in the movable member  3 , and the coil  62  is arranged in the fixed member  2 . The movable member  3  is connected to the fixed member  2  through the damper member  10  in each of the positions of an end portion on the L1 side and an end portion on the L2 side. Hence, the damper members  10  are arranged at two places which are separate from each other in the direction of the axis line L. 
     Fixed Member 
     The fixed member  2  includes a case  20  and a first holder  4  and a second holder  5  which are held by the case  20 . The case  20  includes a tubular case  21  which extends in the direction of the axis line L, a first end plate  22  which is fixed to the end portion of the tubular case  21  on the L1 side and a second end plate  23  which is fixed to the end portion of the tubular case  21  on the L2 side. The first holder  4  and the second holder  5  are arranged inside the tubular case  21 . The coil  62  is fixed to the first holder  4 , and the damper member  10  is also connected thereto. The damper member  10  is connected to the second holder  5 . In the present embodiment, the first holder  4  and the second holder  5  are made of resin, and the case  20  is made of metal. 
     The first holder  4  includes an annular portion  42  in which a circular opening portion  41  is provided in the center and a coil fixing portion  43  which protrudes from the inner circumferential portion of the annular portion  42  to the L2 side and which is cylindrical. The coil  62  is wound on the outer circumferential side of the coil fixing portion  43 . In the opening portion  41 , the damper member  10  is arranged. 
     The outer circumferential surface of the annular portion  42  is a cylindrical surface, and is in contact with the tubular case  21  within the tubular case  21 . As shown in  FIG. 2 , in the annular portion  42 , ribs  421  which extend in the radial direction are formed. Between the ribs  421  adjacent to each other in a circumferential direction, a lightening portion  422  is formed. A base plate  63  to which a coil wire is connected is fixed to the annular portion  42 . The base plate  63  is arranged in a recess portion  44  which is provided in the outer circumferential surface of the annular portion  42 . 
     The second holder  5  includes an annular portion  52  in which a circular opening portion  51  is provided in the center, a cylindrical portion  53  which protrudes from the outer circumferential edge of the annular portion  52  to the L1 side and a protrusion portion  54  which protrudes from part of the cylindrical portion  53  in the circumferential direction to the L1 side. The tip of the protrusion portion  54  is arranged in the recess portion  44  of the first holder  4 . The damper member  10  is arranged inside the opening portion  51 . The outer circumferential surface of the annular portion  52  and the cylindrical portion  53  is a cylindrical surface, and is in contact with the tubular case  21  within the tubular case  21 . 
     Movable Member 
     The movable member  3  includes a shaft  31  which extends in the direction of the axis line L at the center of the fixed member  2  in the radial direction, the magnet  61  which is fixed substantially to the center of the shaft  31  in the direction of the axis line L, a first yoke  32  which is overlaid on the magnet  61  on the L1 side, a second yoke  33  which is overlaid on the magnet  61  on the L2 side, an inner annular member  36  which is overlaid on the first yoke  32  on the L1 side and an inner annular member  37  which is overlaid on the second yoke  33  on the L2 side and which is made of metal. The inner annular members  36  and  37  include shaft holes into which the shaft  31  is fitted. The inner annular members  36  and  37  have the same shape, and are arranged in the direction of the axis line L to be directed in opposite directions. The inner annular members  36  and  37  are weights for adjusting the mass of the movable member  3 . 
     In the actuator  1  in which the movable member  3  and the fixed member  2  are connected with a connection member (gel damper member  14 ), as indicated by formula (1) below, the resonance frequency f0 of the movable member  3  is specified by a formula including the mass m of the movable member  3  and the spring constant k of the connection member (gel damper member  14 ). 
       Resonance frequency  f 0=(½π)×√( k/m )  (1)
 
     k: spring constant of connection member (gel damper member  14 ), m: mass of movable member  3   
     The magnet  61  is cylindrical, and is magnetized so as to be polarized into N and S poles in the direction of the axis line L. The shaft  31  extends in the direction of the axis line L at the center of the fixed member  2  in the radial direction. On the outer circumferential side of the magnet  61 , the coil fixing portion  43  provided in the first holder  4  is arranged coaxially with the magnet  61 . Hence, 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 that of the magnet  61 . 
     The outer circumferential surface of the first yoke  32  projects outward in the radial direction beyond the outer circumferential surface of the magnet  61 . The first yoke  32  is fixed to the surface of the magnet  61  on the L1 side by a method of adhesion or the like. The second yoke  33  is formed with two magnetic plates (a first magnetic plate  34  and a second magnetic plate  35 ). The first magnetic plate  34  includes an end plate portion  341  which is arranged on the L2 side of the magnet  61  and a side plate portion  342  which extends from the outer edge of the end plate portion  341  to the L1 side and which is cylindrical. The side plate portion  342  is arranged on the outer circumferential side of the coil fixing portion  43 . The second magnetic plate  35  is in the shape of a disk which is slightly smaller than the end plate portion  341  of the first magnetic plate  34 . The second magnetic plate  35  is staked on the end plate portion  341  of the first magnetic plate  34  on the L1 side, and is 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 of adhesion or the like. 
     Damper Member 
     The damper members  10  are arranged at the two places between the shaft  31  and the first holder  4  and between the shaft  31  and the second holder  5 . In the following description, the damper member  10  which connects the shaft  31  and the first holder  4  is assumed to be a first damper member  10 A, and the damper member  10  which connects the shaft  31  and the second holder  5  is assumed to be a second damper member  10 B. The first damper member  10 A and the second damper member  10 B have the same configuration, and are arranged in the direction of the axis line L to be directed in opposite directions. 
     The damper member  10  (the first damper member  10 A, the second damper member  10 B) includes a cylindrical first member  11 , a second member  12  which is arranged on the outer circumferential side of the first member  11  and the gel damper member  14  which is the connection member arranged between the first member  11  and the second member  12 . The first member  11  and the second member  12  are cylindrical and are arranged coaxially. The gel damper member  14  is a cylindrical member whose thickness in the radial direction is constant, and a dimension (height) in the direction of the axis line L is also constant. The gel damper member  14  is formed of a silicone gel. For example, as the gel damper member  14 , a silicone gel in which the degree of penetration is 90 to 110 degrees can be used. 
     The inner circumferential portion  141  of the gel damper member  14  is connected to the first member  11 , and the outer circumferential portion  142  of the gel damper member  14  is connected to the second member  12 . The gel damper member  14  is molded by filling a gel material between the first member  11  and the second member  12  and thermally curing the gel material. When the gel material is thermally cured, parts thereof in contact with a primer  13  (see  FIG. 3 ) which is applied to the outer circumferential surface of the first member  11  and the inner circumferential surface of the second member  12  react, and thus the gel material is fixed to the surfaces to which the primer  13  is applied. Hence, the gel damper member  14  does not need to be fixed to the first member  11  and the second member  12  with an adhesive after the curing, and, by the adhesive force of the gel damper member  14  itself reacting with the primer  13 , the inner circumferential portion  141  is connected to the first member  11  and the outer circumferential portion  142  is connected to the second member  12 . 
     Attachment Structure of Damper Member 
     The first damper member  10 A which connects the shaft  31  and the first holder  4  is arranged in the opening portion  41  of the first holder  4 . The second member  12  of the first damper member  10 A is fixed to the inner surface of the opening portion  41  by adhesion or the like. The first member  11  of the first damper member  10 A is fixed to the end portion of the shaft  31  on the L1 side with a bolt  310  arranged in a shaft hole  19  penetrating the center part of the first member  11 . In this way, the first holder  4  and the shaft  31  are connected with the first damper member  10 A. The first member  11  abuts on the inner annular member  36  from the L1 side. 
     The second damper member  10 B which connects the shaft  31  and the second holder  5  is arranged in the opening portion  51  of the second holder  5 . The second member  12  of the second damper member  10 B is fixed to the inner surface of the opening portion  51  by adhesion or the like. The first member  11  of the second damper member  10 B is fixed to the end portion of the shaft  31  on the L2 side with a bolt  310  arranged in a shaft hole  19 . In this way, the second holder  5  and the shaft  31  are connected with the second damper member  10 B. The first member  11  abuts on the inner annular member  37  from the L2 side. 
     Operation of Actuator 
     In the actuator  1 , the coil  62  is energized, and thus the magnetic drive mechanism  6  generates a drive force for driving the movable member  3  in the direction of the axis line L. When the energization of the coil  62  is stopped, the movable member  3  is returned to an origin position by the restoration force of the gel damper member  14 . Hence, the coil  62  is intermittently energized, and thus the movable member  3  is vibrated in the direction of the axis line L. 
     The first damper member  10 A includes the gel damper member  14  which surrounds the end portion of the shaft  31  on the L1 side over the entire circumference between the shaft  31  and the first holder  4 . The second damper member  10 B includes the gel damper member  14  which surrounds the end portion of the shaft  31  on the L2 side over the entire circumference between the shaft  31  and the second holder  5 . In the first damper member  10 A and the second damper member  10 B, the gel damper member  14  is filled between the first member  11  and the second member  12  without any gap, and is continuously arranged over the entire circumference. When the movable member  3  is vibrated on the fixed member  2  in the direction of the axis line L, the first member  11  fixed to the inner circumferential portion  141  of the gel damper member  14  and the second member  12  fixed to the outer circumferential portion  142  of the gel damper member  14  are relatively moved in the direction of the axis line L. Hence, the gel damper member  14  is deformed in a shearing direction so as to follow the vibration of the movable member  3 . 
     Method for Manufacturing Damper Member 
       FIG. 3  is an illustrative view of a method for manufacturing the damper member  10 . A manufacturing jig  90  used in the manufacturing of the damper member  10  includes a circular recess portion  91  and a pin  92  which protrudes from the center of the bottom surface of the circular recess portion  91 . The method for manufacturing the damper member  10  includes a first step for mounting the first member  11  and the second member  12  on the manufacturing jig  90 , a second step for filling the gel material  140  in a gap S between the first member  11  and the second member  12 , a third step for thermally curing the gel material  140  and a fourth step for removing the damper member  10  from the manufacturing jig  90 . 
     In the first step, the first member  11  and the second member  12  are caused to abut on the manufacturing jig  90  so as to be located, and thus the gap S in the radial direction is formed between the first member  11  and the second member  12 . As shown in  FIG. 3 , in the first step, the pin  92  protruding from the center of the circular recess portion  91  is inserted into the shaft hole  19  of the first member  11 , and the first member  11  is caused to abut on the bottom surface of the circular recess portion  91  from the L1 side. The second member  12  is bought into contact with the inner circumferential surface of the circular recess portion  91  within the circular recess portion  91 , and the second member  12  is caused to abut on the outer circumferential region of the bottom surface of the circular recess portion  91 . In this way, the first member  11  and the second member  12  are located in the direction of the axis line L and in the radial direction, and the annular gap S is formed between the first member  11  and the second member  12 . The annular gap S is formed over the entire circumference, and its width in the radial direction is constant over the entire circumference. 
     In the second step, the gel material  140  before being cured is filled in the gap S in the radial direction formed between the first member  11  and the second member  12 . As shown in  FIG. 3 , in the second step, a given amount of gel material  140  is discharged from a dispenser  93  into the gap S. Here, before the gel material  140  before being cured is filled in the gap S, the primer  13  is applied to the outer circumferential surface of the first member  11  and the inner circumferential surface of the second member  12  serving as the surfaces to be in contact with the gel material  140 . The operation of applying the primer  13  may be performed before or after the first member  11  and the second member  12  are mounted on the manufacturing jig  90 . 
     In the third step, the gel material  140  is heated together with the manufacturing jig  90  and is maintained at a specified temperature for a specified time so as to be cured. In this way, in the gap S, the gel damper member  14  is formed. When the gel material  140  is thermally cured, the parts thereof in contact with the primer  13  react, and thus the gel material  140  is fixed to the outer circumferential surface of the first member  11  and the inner circumferential surface of the second member  12 . Hence, in the gel damper member  14  after being cured, without use of an adhesive, by the adhesive force of the gel damper member  14  itself, the inner circumferential portion  141  of the gel damper member  14  is fixed to the first member  11 , and the outer circumferential portion  142  of the gel damper member  14  is fixed to the second member  12 . 
     In the fourth step, the completed damper member  10  is removed from the manufacturing jig  90 . For example, in the surface of the manufacturing jig  90  on which the first member  11  abuts and the surface on which the second member  12  abuts, through holes for arranging ejection pins are provided, and the ejection pins are used to remove the damper member  10  from the manufacturing jig  90 . In this way, it is possible to obtain the damper member  10  in which the first member  11  and the second member  12  are connected with the gel damper member  14 . 
     Main Effects of Embodiment 1 
     As described above, in the actuator  1  of embodiment 1, the damper members  10  which connect the movable member  3  and the fixed member  2  are arranged at the two places between the end portion of the shaft  31  on the L1 side which is an inner circumferential side part provided in the movable member  3  and the opening portion  41  of the first holder  4  which is an outer circumferential side part provided in the fixed member  2  and between the end portion of the shaft  31  on the L2 side which is an inner circumferential side part provided in the movable member  3  and the opening portion  51  of the second holder  5 . Each of the damper members  10  includes the gel damper member  14  serving as the connection member which is continuously arranged in the gap in the radial direction between the movable member  3  and the fixed member  2  over the entire circumference, and in the gel damper member  14 , the inner circumferential portion  141  is fixed to the shaft  31  through the first member  11 , and the outer circumferential portion  142  is fixed to the fixed member  2  through the second member  12 . 
     In the configuration described above, when the movable member  3  is vibrated in the direction of the axis line L with the magnetic drive mechanism  6 , the gel damper member  14  is deformed in the shearing direction whereas when the movable member  3  is moved in the radial direction, the gel damper member  14  is deformed in such a direction that the gel damper member  14  is collapsed. Since the spring constant when the gel damper member  14  is deformed in such a direction that the gel damper member  14  is collapsed is about three times as high as the spring constant when the gel damper member  14  is deformed in the shearing direction, the damper member  10  of embodiment 1 is used, and thus it is possible to reduce the movement of the movable member  3  in a direction different from the direction of the vibration (direction of the axis line L). 
     Hence, it is possible to reduce the movement of the movable member  3  in an unintended direction, and thus it is possible to reduce the collision of the movable member  3  and the fixed member  2 . 
     In the actuator  1  of embodiment 1, the damper members  10  are arranged on one end side (L1 side) of the movable member  3  in the direction of the vibration (direction of the axis line L) and on the other end side (L2 side), and in each of the positions of the one end side (L1 side) of the movable member  3  and on the other end side (L2 side), the movable member  3  and the fixed member  2  are connected with the gel damper member  14 . As described above, both the ends of the movable member  3  in the direction of the vibration are supported with the gel damper member  14 , and thus the movable member  3  can be stably supported. It is also possible to reduce the movement of the movable member  3  in an unintended direction. 
     In embodiment 1, the gel damper member  14  is cylindrical, and thus the spring constant when the gel damper member  14  is deformed in such a direction that the gel damper member  14  is collapsed is uniform in the circumferential direction. Hence, it is possible to reduce the movement of the movable member  3  in a direction different from the direction of the vibration. Since the thickness of the gel damper member  14  in the radial direction is constant over the entire circumference, the spring constant of the gel damper member  14  is constant over the entire circumference. Hence, the movable member  3  is prevented from being easily moved in a specific direction, and thus it is possible to stably support the movable member  3 . 
     The actuator  1  of embodiment 1 includes the magnetic drive mechanism  6  which vibrates the movable member  3  on the fixed member  2 , the magnet  61  is fixed to the outer circumferential surface of the shaft  31  and the coil  62  is wound on the annular coil fixing portion  43  which is arranged so as to surround the outer circumferential side of the magnet  61 . The movable member  3  includes the first yoke  32  and the second yoke  33 , and the second yoke  33  includes the side plate portion  342  arranged on the outer circumferential side of the coil fixing portion  43 . In the configuration described above, with a simple structure, a large drive force can be obtained, and thus it is possible to increase the output of the actuator  1 . 
     In embodiment 1, the damper member  10  includes the tubular first member  11  and the second member  12  which is arranged on the outer circumferential side of the first member  11  and which is tubular, and the first member  11  and the second member  12  are connected with the gel damper member  14  serving as the connection member. In a case where as described above, the gel damper member  14  is molded between the two frame members into a component, when the actuator  1  is assembled, it is not necessary to perform an operation of adhering the gel damper member  14 , with the result that it is not necessary to provide an operational space therefor. Hence, it is possible to efficiently manufacture the actuator  1 . 
     In embodiment 1, when the damper member  10  is manufactured, the gel material  140  is filled between the outer circumferential surface of the first member  11  and the inner circumferential surface of the second member  12  to which the primer  13  is applied and is thermally cured, and thus the primer  13  and the gel material are caused to react with each other, with the result that, by the adhesive force of the gel damper member  14  itself, the first member  11  and the second member  12  are connected to the gel damper member  14 . Hence, even in a step for manufacturing the damper member  10 , it is not necessary to perform the operation of adhering the gel damper member  14 , and it is also not necessary to handle the gel damper member  14  as a single member. A step for curing the gel material  140  does not need to be performed on the main parts of the movable member  3  and the fixed member  2 . Hence, it is possible to efficiently manufacture the actuator  1 . 
     Embodiment 2 
     Overall Configuration 
       FIG. 4  is a cross-sectional view of an actuator  1 A according to embodiment 2 of the present invention.  FIG. 5  is an exploded perspective view when the actuator  1 A of  FIG. 4  is seen from the L1 side.  FIG. 5  is an exploded perspective view when the actuator  1 A of  FIG. 4  is seen from the L2 side. In the following description, the same configurations as in embodiment 1 are identified with the same symbols, and the descriptions thereof will be omitted. As shown in  FIGS. 4 to 6 , the actuator  1 A includes a fixed member  2 A, a movable member  3 A, a gel damper member  14  serving as a connection member which connects the fixed member  2 A and the movable member  3 A and a magnetic drive mechanism  6  which relatively moves the movable member  3 A in the direction of the axis line L with respect to the fixed member  2 A. As in embodiment 1, the magnetic drive mechanism  6  includes a magnet  61  arranged in the movable member  3 A and a coil  62  arranged in the fixed member  2 A. 
     In the actuator  1 A of embodiment 2, the gel damper member  14  is not previously molded between frame members (the first member  11  and the second member  12  of embodiment 1) into a component as the damper member  10 , and the gel damper members  14  are molded between components (inner annular members  36 A and  37 A which will be described later) on the side of the movable member  3 A and components (outer annular members  40  and  50 ) on the side of the fixed member  2 A. In each of the positions of the end portion of the movable member  3 A on the L1 side and the end portion on the L2 side, the gel damper member  14  is arranged in a gap in the radial direction between the fixed member  2 A and the movable member  3 A. In the following description, the gel damper member  14  arranged in the end portion of the movable member  3 A on the L1 side is assumed to be a first gel damper member  14 A, and the gel damper member  14  arranged in the end portion of the movable member  3 A on the L2 side is assumed to be a second gel damper member  14 B. 
     Fixed Member 
     The fixed member  2  includes a case  20 A which is made of resin, a holder  4 A (holder member) which is held by the case  20 A and the outer annular members  40  and  50 . The outer annular members  40  and  50  have the same shape and are arranged in the direction of the axis line L to be directed in opposite directions. The case  20 A of embodiment 2 includes a tubular case  21 A, a first lid member  22 A which is fixed to the end portion of the tubular case  21 A on the L1 side and a second lid member  23 A which is fixed to the end portion of the tubular case  21 A on the L2 side. A base plate  63 A to which a coil wire is connected is fixed to the tubular case  21 A. The base plate  63 A is arranged in a recess portion  24  provided in the outer circumferential surface of the tubular case  21 A. 
     The holder  4 A includes an annular portion  42 A which is fixed to the L2 side of the first lid member  22 A and a coil fixing portion  43 A which protrudes from the annular portion  42 A to the L2 side. In the inner circumferential portion of the annular portion  42 A, an annular recess portion  41 A which is recessed toward the L2 side is provided, and the outer annular member  40  is fixed to the annular recess portion  41 A. The outer annular member  40  is fixed to the outer circumferential portion  142  of the first gel damper member  14 A. 
     As shown in  FIG. 6 , the tubular case  21 A includes a case side annular portion  25  which protrudes from the position of the second lid member  23 A on the L1 side to the inner circumferential side. The second lid member  23 A is fixed to the case side annular portion  25  from the L2 side. The case side annular portion  25  includes a circular opening portion  51 A, and the outer annular member  50  is fixed to the opening portion  51 A. The outer annular member  50  is fixed to the outer circumferential portion  142  of the second gel damper member  14 B. 
     Movable Member 
     The movable member  3 A includes a shaft  31 A which extends in the direction of the axis line L at the center of the fixed member  2 A in the radial direction, the magnet  61  which is fixed substantially to the center of the shaft  31 A in the direction of the axis line L, a first yoke  32 A which is overlaid on the magnet  61  on the L1 side, a second yoke  33 A which is overlaid on the magnet  61  on the L2 side, the inner annular member  36 A which is overlaid on the first yoke  32 A on the L1 side and the inner annular member  37 A which is overlaid on the second yoke  33 A on the L2 side and which is made of metal. The inner annular members  36 A and  37 A include shaft holes into which the shaft  31 A is fitted. The inner annular members  36 A and  37 A have the same shape, and are arranged in the direction of the axis line L to be directed in opposite directions. As in embodiment 1, the inner annular members  36 A and  37 A are weights for adjusting the mass of the movable member  3 A. 
     In embodiment 2, the first magnetic plate  34 A of the second yoke  33 A includes an end plate portion  341 A which is fixed to the surface of the magnet  61  on the L2 side by a method of adhesion or the like and a side plate portion  342 A which extends from the outer edge of the end plate portion  341 A to the L1 side and which is cylindrical. The second magnetic plate  35 A of the second yoke  33 A abuts on the end plate portion  341 A from the L2 side. 
     Gel Damper Member 
     In embodiment 2, as the gel damper members  14 , the first gel damper member  14 A arranged between the inner annular member  36 A attached to the end portion of the shaft  31 A on the L1 side and the outer annular member  40  and the second gel damper member  14 B arranged between the inner annular member  37 A attached to the end portion of the shaft  31 A on the L2 side and the outer annular member  50  are provided. The gel damper member  14  is a cylindrical member whose thickness in the radial direction is constant, and a dimension (height) in the direction of the axis line L is also constant. The gel damper member  14  is formed of a silicone gel. For example, as the gel damper member  14 , a silicone gel in which the degree of penetration is 90 to 110 degrees can be used. 
     In the first gel damper member  14 A, an inner circumferential portion  141  is connected to the inner annular member  36 A, and an outer circumferential portion  142  is connected to the outer annular member  40 . In the second gel damper member  14 B, an inner circumferential portion  141  is connected to the inner annular member  37 A, and an outer circumferential portion  142  is connected to the outer annular member  50 . When the first gel damper member  14 A and the second gel damper member  14 B are connected to the members arranged on the inner circumferential side and the outer circumferential side thereof, the same method as used for molding the gel damper member  14  between the first member  11  and the second member  12  in embodiment 1 is performed. 
     For example, the inner annular member  36 A and the outer annular member  40  are mounted on a jig to form a predetermined gas between the inner annular member  36 A and the outer annular member  40 , and the gel material is filled in the gap and is thermally cured. Before the gel material is filled, a primer  13  is applied to the outer circumferential surface of the inner annular member  36 A and the inner circumferential surface of the outer annular member  40 . In this way, when the gel material is thermally cured, the parts thereof in contact with the primer  13  react, and, by the adhesive force of the first gel damper member  14 A itself, the inner circumferential portion  141  of the first gel damper member  14 A is fixed to the inner annular member  36 A and the outer circumferential portion  142  of the first gel damper member  14 A is fixed to the outer annular member  40 . The second gel damper member  14 B is also molded between the inner annular member  37 A and the outer annular member  50  by the same method. 
     In the actuator  1 A of embodiment 2, as in embodiment 1, the coil  62  is energized, and thus the magnetic drive mechanism  6  generates a drive force for driving the movable member  3 A in the direction of the axis line L, with the result that the movable member  3 A is vibrated in the direction of the axis line L. The gel damper members  14  are filled between the inner annular member  36 A and the outer annular member  40  and between the inner annular member  37 A and the outer annular member  50  without any gap, and are continuously arranged over the entire circumference. When the movable member  3 A is vibrated on the fixed member  2 A in the direction of the axis line L, the gel damper member  14  is deformed in the shearing direction so as to follow the vibration of the movable member  3 A. 
     Main Effects of Embodiment 2 
     As described above, in the actuator  1 A of embodiment 2, the gel damper members  14  serving as the connection members which connect the movable member  3 A and the fixed member  2 A are arranged at the two places between the inner annular member  36 A which is an inner circumferential side part provided in the movable member  3  and the outer annular member  40  which is an outer circumferential side part provided in the fixed member  2 A and between the inner annular member  37 A which is an inner circumferential side part provided in the movable member  3 A and the outer annular member  50  which is an outer circumferential side part provided in the fixed member  2 A. Each of the gel damper members  14  is continuously arranged in the gap in the radial direction between the movable member  3 A and the fixed member  2 A over the entire circumference, the inner circumferential portion  141  of the gel damper member  14  is connected to the movable member  3 A and the outer circumferential portion  142  of the gel damper member  14  is connected to the fixed member  2 A. Hence, it is possible to reduce the movement of the movable member  3 A in a direction different from the direction of the vibration (direction of the axis line L). 
     Therefore, it is possible to reduce the movement of the movable member  3 A in an unintended direction, and thus it is possible to reduce the collision of the movable member  3 A and the fixed member  2 A. 
     Embodiment 2 is the same as embodiment 1 in that the gel damper members  14  are arranged at both the ends of the movable member  3 A in the direction of the axis line L and that the gel damper members  14  are cylindrical. Hence, in these respects, the same operational effects as in embodiment 1 can be obtained. 
     In embodiment 2, the weights (inner annular members  36 A and  37 A) for adjusting the mass of the movable member  3 A are used as the frame members to which the inner circumferential portions  141  of the gel damper members  14  are connected. As described above, the frame members are also used as the weights, and thus it is possible to reduce the number of components. When the gel damper members  14  are molded, as the members on the side of the movable member  3 A, the inner annular members  36 A and  37 A are preferably used, with the result that it is not necessary to mold the gel damper members  14  on the main parts of the movable member  3 A. Therefore, it is possible to efficiently manufacture the actuator  1 . 
     In embodiment 2, the holder  4 A (holder member) including the coil fixing portion  43 A and the outer annular members  40  and  50  used as the frame members when the gel damper members  14  are molded are used as separate components, and the outer annular member  40  is fixed to the holder  4 A (holder member). Hence, when the gel damper members  14  are molded, as the components on the side of the fixed member  2 A, the outer annular members  40  and  50  are preferably used, with the result that it is not necessary to mold the gel damper member  14  for the component on which the coil  62  is wound. Therefore, it is possible to efficiently manufacture the actuator  1 . 
     In embodiment 2, when the gel damper member  14  is manufactured, the gel material  140  is filled between the component on the side of the movable member  3 A and the component on the side of the fixed member  2 A to which the primer  13  is applied and is thermally cured, and thus the primer  13  and the gel material are caused to react with each other, with the result that, by the adhesive force of the gel damper member  14  itself, the component on the side of the movable member  3 A and the component on the side of the fixed member  2 A are connected. Hence, in a step for manufacturing the actuator  1 , it is not necessary to perform an operation of adhering the gel damper member  14 , with the result that it is not necessary to provide an operational space therefor. Therefore, it is possible to efficiently manufacture the actuator  1 . 
     Embodiment 3 
     Overall Configuration 
       FIG. 7  is a cross-sectional view of an actuator  1 B according to embodiment 3 of the present invention.  FIG. 8  is an exploded perspective view when the actuator  1 B of  FIG. 7  is seen from the L1 side.  FIG. 9  is an exploded perspective view when the actuator  1 B of  FIG. 7  is seen from the L2 side. In the following description, the same configurations as in embodiments 1 and 2 are identified with the same symbols, and the descriptions thereof will be omitted. As shown in  FIGS. 7 to 9 , the actuator  1 B includes a fixed member  2 B, a movable member  3 B, a gel damper member  14  serving as a connection member which connects the fixed member  2 B and the movable member  3 B and a magnetic drive mechanism  6  which relatively moves the movable member  3 B in the direction of the axis line L with respect to the fixed member  2 B. As in embodiments 1 and 2, the magnetic drive mechanism  6  includes a magnet  61  arranged in the movable member  3 B and a coil  62  arranged in the fixed member  2 B. 
     In the actuator  1 B of embodiment 3, as in embodiment 2, the gel damper members  14  are molded between components (inner annular members  36 B and  37 B which will be described later) on the side of the movable member  3 B and components (a first holder  4 B and a second holder  5 B) on the side of the fixed member  2 B. In each of the positions of the end portion of the movable member  3 B on the L1 side and the end portion on the L2 side, the gel damper member  14  is arranged in a gap in the radial direction between the fixed member  2 B and the movable member  3 B. In the following description, the gel damper member  14  arranged in the end portion of the movable member  3 B on the L1 side is assumed to be a first gel damper member  14 A, and the gel damper member  14  arranged in the end portion of the movable member  3 B on the L2 side is assumed to be a second gel damper member  14 B. 
     Fixed Member 
     The fixed member  2  includes a case  20 B which is made of metal, the first holder  4 B and the second holder  5 B held by the case  20 B and a coil holder  70 . The case  20 B of embodiment 3 includes a tubular case  21 B, a first end plate  22 B which is fixed to the end portion of the tubular case  21 B on the L1 side and a second end plate  23 B which is fixed to the end portion of the tubular case  21 B on the L2 side. A base plate  63 B to which a coil wire is connected is fixed to the tubular case  21 B. The base plate  63 B is fixed to a fixing component  26  which protrudes from the outer circumferential surface of the tubular case  21 B. 
     The first holder  4 B (outer annular member) includes an annular portion  42 B which is fixed to the inner side of the end portion of the tubular case  21 B on the L1 side, a frame part  45  which is arranged on the inner circumferential side of the annular portion  42  and a connection portion  46  which connects the annular portion  42 B and the frame part  45 . As will be described later, the outer circumferential portion  142  of the gel damper member  14  is fixed to the frame part  45 . The coil holder  70  (holder member) includes a holder fixing portion  71  which is fixed to the first holder  4 B from the L1 side and a coil fixing portion  72  which protrudes from the holder fixing portion  71  to the L2 side. As shown in  FIGS. 8 and 9 , the holder fixing portion  71  includes hooks  73  which protrude from three places separate in the circumferential direction to the L1 side. The hooks  73  are arranged in recess portions  47  provided in the outer circumferential surface of the first holder  4 B, and the tips of the hooks  73  are locked on the edge of the tubular case  21 B. 
     The second holder  5 B includes a cylindrical portion  55  which is fixed to the inner side of the end portion of the tubular case  21 B on the L2 side, a frame part  56  which is arranged on the inner circumferential side of the cylindrical portion  55  and a connection portion  57  which connects the cylindrical portion  55  and the frame part  56 . As will be described later, the outer circumferential portion  142  of the gel damper member  14  is fixed to the frame part  56 . 
     Movable Member 
     The movable member  3 B includes a shaft  31 B which extends in the direction of the axis line L at the center of the fixed member  2 B in the radial direction, the magnet  61  which is fixed substantially to the center of the shaft  31 B in the direction of the axis line L, a first yoke  32 B which is overlaid on the magnet  61  on the L1 side, a second yoke  33 B which is overlaid on the magnet  61  on the L2 side, an inner annular member  36 B which is overlaid on the first yoke  32 B on the L1 side and an inner annular member  37 B which is overlaid on the second yoke  33 B on the L2 side and which is made of metal. The inner annular members  36 B and  37 B include shaft holes into which the shaft  31 B is fitted. The inner annular members  36 B and  37 B have the same shape, and are arranged in the direction of the axis line L to be directed in opposite directions. As in embodiments 1 and 2, the inner annular members  36 B and  37 B are weights for adjusting the mass of the movable member  3 B. 
     In embodiment 3, the first magnetic plate  34 B of the second yoke  33 B includes an end plate portion  341 B which is fixed to the surface of the magnet  61  on the L2 side by a method of adhesion or the like and a side plate portion  342 B which extends from the outer edge of the end plate portion  341 B to the L1 side and which is cylindrical. The second magnetic plate  35 B of the second yoke  33 B abuts on the end plate portion  341 B from the L2 side. 
     Gel Damper Member 
     In embodiment 3, as the gel damper members  14 , the first gel damper member  14 A arranged between the inner annular member  36 B attached to the end portion of the shaft  31 B on the L1 side and the frame part  45  of the first holder  4 B and the second gel damper member  14 B arranged between the inner annular member  37 B attached to the end portion of the shaft  31 B on the L2 side and the frame part  56  of the second holder  5 B are provided. The gel damper member  14  is a cylindrical member whose thickness in the radial direction is constant, and a dimension (height) in the direction of the axis line L is also constant. The gel damper member  14  is formed of a silicone gel. The gel damper member  14  is formed of a silicone gel. For example, as the gel damper member  14 , a silicone gel in which the degree of penetration is 90 to 110 degrees can be used. 
     In the first gel damper member  14 A, an inner circumferential portion  141  is connected to the inner annular member  36 B, and an outer circumferential portion  142  is connected to the frame part  45  of the first holder  4 B. In the second gel damper member  14 B, an inner circumferential portion  141  is connected to the inner annular member  37 B, and an outer circumferential portion  142  is connected to the frame part  56  of the second holder  5 B. When the first gel damper member  14 A and the second gel damper member  14 B are connected to the members arranged on the inner circumferential side and the outer circumferential side thereof, the same method as used for molding the gel damper member  14  between the first member  11  and the second member  12  in embodiment 1 is performed. 
     For example, the inner annular member  36 B and the first holder  4 B are mounted on a jig to form a predetermined gas between the inner annular member  36 B and the frame part  45  of the first holder  4 B, and the gel material is filled in the gap and is thermally cured. Before the gel material is filled, a primer  13  is applied to the outer circumferential surface of the inner annular member  36 B and the inner circumferential surface of the frame part  45 . In this way, when the gel material is thermally cured, the parts thereof in contact with the primer  13  react, and, by the adhesive force of the first gel damper member  14 A itself, the inner circumferential portion  141  of the first gel damper member  14 A is fixed to the inner annular member  36 B and the outer circumferential portion  142  of the first gel damper member  14 A is fixed to the frame part  45 . The second gel damper member  14 B is also molded between the inner annular member  37 B and the frame part  56  of the second holder  5  by the same method. 
     In the actuator  1 B of embodiment 3, as in embodiment 1, the coil  62  is energized, and thus the magnetic drive mechanism  6  generates a drive force for driving the movable member  3 B in the direction of the axis line L, with the result that the movable member  3 B is vibrated in the direction of the axis line L. The gel damper members  14  are filled between the inner annular member  36 B and the frame part  45  and between the inner annular member  37 B and the frame part  56  without any gap, and are continuously arranged over the entire circumference. When the movable member  3 B is vibrated on the fixed member  2 B in the direction of the axis line L, the gel damper member  14  is deformed in the shearing direction so as to follow the vibration of the movable member  3 B. 
     Main Effects of Embodiment 3 
     As described above, in the actuator  1 B of embodiment 3, the gel damper members  14  serving as the connection members which connect the movable member  3 B and the fixed member  2 B are arranged at the two places between the inner annular member  36 B which is an inner circumferential side part provided in the movable member  3  and the frame part  45  which is an outer circumferential side part provided in the fixed member  2 B and between the inner annular member  37 B which is an inner circumferential side part provided in the movable member  3 B and the frame part  56  which is an outer circumferential side part provided in the fixed member  2 B. Each of the gel damper members  14  is continuously arranged in the gap in the radial direction between the movable member  3 B and the fixed member  2 B over the entire circumference, the inner circumferential portion  141  of the gel damper member  14  is connected to the movable member  3 B and the outer circumferential portion  142  of the gel damper member  14  is connected to the fixed member  2 B. Hence, it is possible to reduce the movement of the movable member  3 B in a direction different from the direction of the vibration (direction of the axis line L). Therefore, it is possible to reduce the movement of the movable member  3 B in an unintended direction, and thus it is possible to reduce the collision of the movable member  3 B and the fixed member  2 B. 
     Embodiment 3 is the same as embodiments 1 and 2 in that the gel damper members  14  are arranged at both the ends of the movable member  3 B in the direction of the axis line L and that the gel damper members  14  are cylindrical. Hence, in these respects, the same operational effects as in embodiment 1 can be obtained. 
     Embodiment 3 is also the same as embodiment 2 in that the weights (inner annular members  36 B an  37 B) for adjusting the mass of the movable member  3 B are used as the frame members to which the inner circumferential portions  141  of the gel damper members  14  are connected and that the coil holder  70  (holder member) including the coil fixing portion  72  and the first holder  4 B (outer circumferential side member) including the frame part  45  used as the frame member when the gel damper member  14  is molded are separate components. Embodiment 3 is also the same as embodiment 2 in that when the gel damper member  14  is manufactured, the gel material  140  is filled between the component on the side of the movable member  3 B and the component on the side of the fixed member  2 B to which the primer  13  is applied and is thermally cured, and thus the primer  13  and the gel material are caused to react with each other, with the result that, by the adhesive force of the gel damper member  14  itself, the component on the side of the movable member  3 B and the component on the side of the fixed member  2 B are connected. Hence, in these respects, the same operational effects as in embodiment 2 can be obtained. 
     Variation 1 
     As the forms of the gel damper member  14  of the embodiments described above, the forms of variations below can be adopted. (a) of  FIG. 10  is a perspective view of the gel damper member  14 C of variation 1, and (b) of  FIG. 10  is a side view of the gel damper member  14 C of variation 1. (a) and (b) of  FIG. 10  show, together with the gel damper member  14 C, an inner frame member  15  to which the inner circumferential portion  141 C of the gel damper member  14 C is fixed and an outer frame member  16  to which the outer circumferential portion  142 C of the gel damper member  14 C is fixed. One of the inner frame member  15  and the outer frame member  16  is fixed to a movable member, and the other of the inner frame member  15  and the outer frame member  16  is fixed to a fixed member. The inner frame member  15  and the outer frame member  16  are cylindrical. The height H 1  of the inner frame member  15  in the direction of the axis line L is smaller than the height H 2  of the outer frame member  16  in the direction of the axis line L. 
     In the gel damper member  14 C of variation 1, the height of the inner circumferential portion  141 C is equal to that of the inner frame member  15 , and the height of the outer circumferential portion  142 C is equal to that of the outer frame member  16 . Hence, in the gel damper member  14 C, the height of the inner circumferential portion  141 C in the direction of the axis line L is greater than that of the outer circumferential portion  142 C in the direction of the axis line L. In this way, an area difference between the area of the gel damper member  14  fixed to the inner frame member  15  and the area of the gel damper member  14  fixed to the outer frame member  16  can be reduced as compared with a case where the heights of the inner circumferential portion  141 C and the outer circumferential portion  142 C in the direction of the axis line L are equal to each other, with the result that the concentration of stress at the inner circumferential portion  141 C can be reduced. As described above, the concentration of stress at the gel damper member  14 C is reduced, and thus it is possible to increase the allowable range of an amplitude when the movable member is vibrated. Hence, the movable member can be vibrated with a large amplitude. It is also possible to enhance the durability of the gel damper member  14 C. 
     Variation 2 
     (a) of  FIG. 11  is a perspective view of the gel damper member  14 D of variation 2. In the gel damper member  14 D of variation 2, as in the embodiments described above, an inner circumferential portion  141 D is annular. Hence, the entire circumference of the inner circumferential portion  141 D is connected to one of a movable member and a fixed member. On the other hand, the outer circumferential portion  142 D of the gel damper member  14 D includes, in part in a circumferential direction, recess portions  143  which are recessed toward an inner circumferential side, and parts of arc-shaped outer circumferential surfaces  144  other than the recess portions  143  are connected to the other of the movable member and the fixed member. 
     In variation 2, an area difference between an area fixed to the inner circumferential portion  141 D and an area fixed to the outer circumferential portion  142 D can be reduced by an area corresponding to the provision of the recess portions  143  in the outer circumferential surface, and thus the concentration of stress at the inner circumferential portion  141 D can be reduced. As described above, the concentration of stress at the gel damper member  14 D is reduced, and thus it is possible to increase the allowable range of an amplitude when the movable member is vibrated. Hence, the movable member can be vibrated with a large amplitude. It is also possible to enhance the durability of the gel damper member  14 D. 
     Variation 3 
     (b) of  FIG. 11  is a perspective view of the gel damper member  14 E of variation 3. In the gel damper member  14 E of variation 3, the height of an inner circumferential portion  141 E in the direction of the axis line L is greater than that of an outer circumferential portion  142 E in the direction of the axis line L. In addition, in the gel damper member  14 E of variation 3, recess portions  143  which are recessed toward an inner circumferential side and arc-shaped outer circumferential surfaces  144  which are not recessed toward the inner circumferential side are alternately provided in the outer circumferential portion  142 E. Hence, in variation 3, an area difference between an area fixed to the inner circumferential portion  141 E and an area fixed to the outer circumferential portion  142 E can be reduced, and thus the concentration of stress at the inner circumferential portion  141 E can be reduced. As described above, the concentration of stress at the gel damper member  14 E is reduced, and thus it is possible to increase the allowable range of an amplitude when the movable member is vibrated. Hence, the movable member can be vibrated with a large amplitude. It is also possible to enhance the durability of the gel damper member  14 E. 
     DESCRIPTION OF REFERENCE NUMERALS 
     
         
         
           
               1 ,  1 A,  1 B . . . actuator 
               2 ,  2 A,  2 B . . . fixed member 
               3 ,  3 A,  3 B . . . movable member 
               4 ,  4 B . . . first holder,  4 A . . . holder 
               5 ,  5 B . . . second holder 
               6  . . . magnetic drive mechanism 
               10  . . . damper member 
               10 A . . . first damper member 
               10 B . . . second damper member 
               11  . . . first member 
               12  . . . second member 
               13  . . . primer 
               14 ,  14 C,  14 D,  14 E . . . gel damper member 
               14 A . . . first gel damper member 
               14 B . . . second gel damper member 
               15  . . . inner frame member 
               16  . . . outer frame member 
               19  . . . shaft hole 
               20 ,  20 A,  20 B . . . case 
               21 ,  21 A,  21 B . . . tubular case 
               22 A . . . first lid member 
               22 ,  22 B . . . first end plate 
               23 A . . . second lid member 
               23 ,  23 B . . . second end plate 
               24  . . . recess portion 
               25  . . . case side annular portion 
               26  . . . fixed component 
               31 ,  31 A,  31 B . . . shaft 
               32 ,  32 A,  32 B . . . first yoke 
               33 ,  33 A,  33 B . . . second yoke 
               34 ,  34 A,  34 B . . . first magnetic plate 
               35 ,  35 A,  35 B . . . second magnetic plate 
               36 ,  36 A,  36 B . . . inner annular member 
               37 ,  37 A,  37 B . . . inner annular member 
               40  . . . outer annular member 
               41  . . . opening portion 
               41 A . . . annular recess portion 
               42 ,  42 A,  42 B . . . annular portion 
               43 ,  43 A . . . coil fixing portion 
               44  . . . recess portion 
               45  . . . frame part 
               46  . . . connection portion 
               47  . . . recess portion 
               50  . . . outer annular member 
               51 ,  51 A . . . opening portion 
               52  . . . annular portion 
               53  . . . cylindrical portion 
               54  . . . protrusion portion 
               55  . . . cylindrical portion 
               56  . . . frame part 
               57  . . . connection portion 
               61  . . . magnet 
               62  . . . coil 
               63 ,  63 A,  63 B . . . base plate 
               70  . . . coil holder 
               71  . . . holder fixing portion 
               72  . . . coil fixing portion 
               73  . . . hook 
               90  . . . manufacturing jig 
               91  . . . circular recess portion 
               92  . . . pin 
               93  . . . dispenser 
               140  . . . gel material 
               141 ,  141 C,  141 D,  141 E . . . inner circumferential portion 
               142 ,  142 C,  142 D,  142 E . . . outer circumferential portion 
               143  . . . recess portion 
               144  . . . arc-shaped outer circumferential surface 
               310  . . . bolt 
               341 ,  341 A,  341 B . . . end plate portion 
               342 ,  342 A,  342 B . . . side plate portion 
               421  . . . rib 
               422  . . . lightening portion 
             L . . . axis line 
             S . . . gap