Patent Publication Number: US-11381139-B2

Title: Motor and rotary apparatus including the same

Description:
CROSS REFERENCE TO RELATED APPLICATIONS 
     The present application is a continuation application of International Patent Application No. PCT/JP2017/029882 filed on Aug. 22, 2017, which claims the benefit of Japanese Patent Application No. 2016-167939, filed on Aug. 30, 2016 and Japanese Patent Application No. 2017-099780, filed on May 19, 2017. The contents of these applications are incorporated herein by reference in their entirety. 
    
    
     BACKGROUND 
     Technical Field 
     The present disclosure relates to a motor and a rotary apparatus including the motor. 
     Background 
     For example, in Japanese Patent Laid-Open No. 2013-158172, a motor having a holder allowing a flexible printed circuit board to be mounted accurately and reliably, preventing wire disconnection and rupture of the flexible printed circuit board even after mounting the flexible printed circuit board and thus enabling stable quality to be maintained, and allowing detachment together with the flexible printed circuit board when some hindrance is caused and an actuator (hereinafter, referred to as a rotary apparatus) using the motor are disclosed. 
     For example, a rotary apparatus is used in an air-conditioning system of an automobile and the like, and on the periphery of the rotary apparatus, other electronic components and the like are also arranged. 
     Upon driving the rotary apparatus, electromagnetic noise is generated from a motor serving as a driving source of the rotary apparatus, and the other electronic components arranged on the periphery of the rotary apparatus may be adversely affected. 
     The present disclosure is related to providing a motor inhibiting emission of electromagnetic noise to the outside and a rotary apparatus including the motor. 
     SUMMARY 
     In accordance with one aspect of the present disclosure, 
     (1) a rotary apparatus includes: a housing; a motor arranged inside the housing; a circuit board arranged inside the housing and electrically connected to the motor; and a flexible wiring board electrically connecting the motor to the circuit board, the motor includes a frame formed with a conductive member, and the frame is electrically connected via the flexible wiring board to a ground of the circuit board. 
     (2) In the above-described configuration (1), the motor includes: a holder provided at the frame; and a plate-like spring supported to the holder, the spring electrically connects the frame and the flexible wiring board, bent one part of the spring contacts the frame, and the spring is elastically deformable in such a direction as to be away from the frame. 
     (3) In the above-described configuration (2), the flexible wiring board is placed at the holder, other part of the spring is supported to a surface of the holder, the surface facing the frame, the motor includes a terminal led out from the frame outwardly, and the terminal passes through the holder and is electrically connected to the flexible wiring board. 
     (4) In the above-described configuration (3), the frame has an opening part leading out the terminal, the flexible wiring board has a first connection part electrically connected to the terminal, the holder includes a placement part, the first connection part placed at the placement part, the placement part is arranged on the opening part, and the spring formed with a conductive member is electrically connected to the first connection part. 
     (5) In the above-described configuration (4), the holder includes a supporting part extending from the placement part to an outside of the opening part, and the placement part is supported by the supporting part to the frame. 
     (6) In the above-described configuration (4) or (5), the terminal passes through a hole part of the placement part, a first end portion of the terminal is led out to a side of the placement part, the side being opposite to a side of the frame, and the first end portion is electrically connected to the first connection part. 
     (7) In any one of the above-described configurations (4) to (6), the motor includes a guide part provided inside the opening part, and the guide part engages with the holder. 
     (8) In the above-described configuration (1), the rotary apparatus includes a flat plate-like member electrically attached to a side surface of the frame, and the frame is electrically connected via the flat plate-like member and the flexible wiring board to a ground of the circuit board. 
     (9) In any one of the above-described configurations (1) to (8), the rotary apparatus includes a gear transmitting rotation of the motor arranged inside the housing to the outside. 
     In accordance with another aspect of the present disclosure, 
     (10) a motor includes: a frame formed with a conductive member; a terminal led out from the frame outwardly; a holder having a placement part, a flexible wiring board placed at the placement part; and a plate-like spring formed with a conductive member, the flexible wiring board is electrically connected to the terminal, bent one part of the spring contacts the frame, other part of the spring is supported to the holder, and the frame is electrically connectable via the spring and the flexible wiring board to a ground. 
     According to the present disclosure, the motor inhibiting emission of electromagnetic noise to the outside and the rotary apparatus including the motor can be provided. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a partially exploded perspective view of a rotary apparatus in a first embodiment according to the present disclosure; 
         FIG. 2  is a partially exploded perspective view of a motor in the first embodiment according to the present disclosure; 
         FIG. 3  is a perspective view showing a state with a spring, a holder, and a flexible wiring board assembled in the first embodiment according to the present disclosure; 
         FIG. 4  is a perspective view of the motor in the first embodiment according to the present disclosure; 
         FIG. 5  is a partially exploded perspective view of a motor in a second embodiment according to the present disclosure; 
         FIG. 6  is a perspective view showing a state with a spring, a holder, and a flexible wiring board assembled in the second embodiment according to the present disclosure; 
         FIG. 7  is a perspective view showing a configuration of a motor in a third embodiment according to the present disclosure; 
         FIG. 8  is a perspective view showing a configuration of the motor with a flexible wiring board removed in the third embodiment according to the present disclosure; 
         FIG. 9  is a partially exploded perspective view showing a configuration of the motor in the third embodiment according to the present disclosure; and 
         FIG. 10  is a sectional view showing one part of the motor in the third embodiment according to the present disclosure. 
     
    
    
     DETAILED DESCRIPTION 
     Hereinafter, modes for carrying out the present disclosure (hereinafter, referred to as “embodiments”) will be described in detail with reference to the accompanying drawings. 
     The same components are denoted with the same reference numerals throughout the description of the embodiments. 
     First Embodiment 
       FIG. 1  is a partially exploded perspective view of a rotary apparatus  10  in a first embodiment according to the present disclosure. 
     As shown in  FIG. 1 , the rotary apparatus  10  includes a housing  20  and various components (a plurality of gears  30 , a motor  40 , a flexible wiring board  44 , a circuit board  50 , and the like) arranged inside the housing  20 . 
     (Housing) 
     The housing  20  includes a first housing  21  with the various components (the plurality of gears  30 , the motor  40 , the circuit board  50 , and the like) arranged and a second housing  22  united with the first housing  21  so as to cover an opening side (an upper side in  FIG. 1 ) of the first housing  21  and serving as a lid part. 
     These first housing  21  and second housing  22  are formed with, for example, a resin material such as polypropylene, polyethylene-terephthalate, polybutylene terephthalate, and ABS. 
     (Gears) 
     The plurality of gears  30  are gears for mechanically transmitting rotation of the motor  40  at a predetermined gear ratio to the outside. 
     Specifically, as shown in  FIG. 1 , the plurality of gears  30  include a worm gear  31  fixed to a shaft of the motor  40 , a first gear  32  connected to the worm gear  31 , a second gear  33  connected to the first gear  32 , and an output gear  34  connected to the second gear  33 . 
     Since the first gear  32  is connected to the worm gear  31  and the second gear  33 , the first gear  32  is constituted of a two-step gear. Of the two-step gear, a gear  32   a  having a large diameter is connected to the worm gear  31  and a gear  32   b  having a small diameter is connected to the second gear  33 . 
     Similarly, since the second gear  33  is connected to the first gear  32  and the output gear  34 , the second gear  33  is constituted of a two-step gear. Of the two-step gear, a gear  33   a  having a large diameter is connected to the first gear  32  (the gear  32   b  having the small diameter) and a gear  33   b  having a small diameter is connected to the output gear  34 . 
     In the first housing  21 , an opening part  21   a  communicating with the outside is formed in a position corresponding to the output gear  34 . 
     This allows access to the output gear  34  from the outside of the housing  20  via the opening part  21   a.    
     Accordingly, a shaft of a louver or the like used in an air-conditioning system of an automobile or the like can be fitted to the fitting part  34   a  provided for the output gear  34  via the opening part  21   a.    
     (Flexible Wiring Board) 
     A flexible wiring board  44  electrically connects a motor  40  and a circuit board  50 . 
     The details as to the flexible wiring board  44  have relevance to attachment and the like to the motor  40  and therefore, will be described in the description of the motor  40 . 
     (Circuit Board) 
     On a circuit board  50 , wiring for electrically connecting at least the later-described flexible wiring board  44  and the outside is formed. 
     In an example shown in  FIG. 1 , the circuit board  50  is provided with circuitry for controlling rotation and the like of the motor  40 , and the circuitry is located in the vicinity of a connector connection part  23  of the first housing  21 . 
     The circuit board  50  is provided with external connection terminals (not shown) arranged so as to extend from the circuit board  50  into the connector connection part  23 . 
     In addition, the circuit board  50  is also provided with internal connection terminals (not shown) located on a side of the motor  40  and electrically connected to the motor  40 . 
     (Motor) 
       FIG. 2  is a partially exploded perspective view of a motor  40 . 
     In  FIG. 2 , a state with a worm gear  31  attached to the shaft of the motor  40  is shown. 
     The motor  40  includes a motor body  41 , a spring  42 , and a holder  43 , and a flexible wiring board  44  is electrically connected to the motor  40 . 
     (Motor Body) 
     A motor body  41  has a frame  41   a  serving as an outer frame and formed with a conductive member, and a rotor and a stator housed inside the frame  41   a.    
     The rotor and the stator may have configurations similar to a rotor and a stator of the heretofore known motor. 
     The rotor includes, for example, a shaft serving as a shaft having one part led out from the motor body  41  and a rotor magnet attached to the outer periphery of the shaft. 
     In addition, the stator includes a stator core (also referred to as a yoke) provided so as to form a space for arranging a rotor magnet in a central portion of the stator core and having a plurality of teeth, an insulator (also referred to as a bobbin) covering the stator core, and a plurality of coils wound onto the teeth via the insulator. 
     The rotor is rotatably supported by bearings arranged on one end side and another end side of the frame  41   a  so as to locate the rotor magnet in the space provided in the central portion of the stator core. 
     In addition, positions for locating the bearings can be appropriately changed. 
     For example, the one bearing may be located on the one end side of the frame  41   a  and the other bearing may be located outside or inside the frame  41   a.    
     Further, the plurality of coils are respectively connected to terminals  41   b , and current is supplied from the terminals  41   b.    
     When the current is supplied from these terminals  41   b  to the coils, in accordance with winding directions of the coils around the teeth of the stator core and directions of the current applied to the coils, the teeth are excited to an N pole or an S pole, mutual attraction with the rotor magnet occurs, and the rotor rotates. 
     The directions of the current applied to the coils or the coils with the current supplied are switched, an exciting state of the teeth is controlled, and thus, the rotation of the rotor continues. 
     In the present embodiment, as shown in  FIG. 2 , the frame  41   a  includes a first frame  41   aa  constituting a substantially half of the frame  41   a  and a second frame  41   ab  constituting the remaining substantially half of the frame  41   a.    
     The first frame  41   aa  is located on the one end side of the frame  41   a.    
     The second frame  41   ab  is located on the other end side of the frame  41   a.    
     In end portions of the first frame  41   aa  and the second frame  41   ab , recessed portions  41   c  are respectively formed. 
     These recessed portions  41   c  face each other in a direction of the shaft. 
     In addition, between these recessed portions  41   c , the terminals  41   b  are located. 
     Accordingly, when the first frame  41   aa  and the second frame  41   ab  are united to be in a state of the frame  41   a , the frame  41   a  comes to have an opening part  41   d  for leading out the terminals  41   b  to the outside. 
     In other words, the opening part  41   d  is formed by the recessed portions  41   c  of the first frame  41   aa  and the second frame  41   ab , and the terminals  41   b  are led out from the frame  41   a  outwardly. 
     (Spring) 
     In the present embodiment, the spring  42  is a plate-like spring formed with a conductive member. 
     As shown in  FIG. 2 , the spring  42  includes two end portions (one part) and central portions  42   b  (other part). 
     This spring  42  has a substantially rectangular opening  42   e  (laterally long and rectangular opening) in a central portion of the spring  42  and is formed with a plate member (conductive member) having a laterally long and rectangular outer shape. 
     In addition, both end portions of the spring  42  are elastic parts  42   a  formed by bending the plate member. 
     These elastic parts  42   a  are formed by bending the end portions of the spring  42  with respect to the central portions  42   b  and are bent portions. 
     The spring  42  is a laterally long and substantially rectangular frame body. 
     By bending the two end portions of this frame body with respect to the central portions  42   b  toward a side of the frame  41   a , a pair of the elastic parts  42   a  generates a biasing force in such a direction as to be away from the frame  41   a.    
     On the central portions  42   b  of the spring  42 , projecting parts  42   ba  projecting toward an inside of the opening are formed. 
       FIG. 3  is a perspective view showing a state with the spring  42 , the holder  43 , and the flexible wiring board  44  assembled. 
       FIG. 3  is the perspective view, viewed from a side of the frame  41   a  when the spring  42 , the holder  43 , and the flexible wiring board  44  are attached to the frame  41   a.    
     As shown in  FIG. 3 , the spring  42  is supported to the holder  43 , and the spring  42  is supported to a surface of the holder  43 , the surface facing the frame  41   a.    
     In detail, the central portions  42   b  (the other part) of the spring  42  are supported to the surface of the holder  43 , the surface facing the frame  41   a.    
     In addition, the two end portions (the one part) of the spring  42  contact the frame  41   a.    
     The pair of the projecting parts  42   ba  formed at the central portions  42   b  of this spring  42  constitutes flange parts contacting the holder  43 . 
     In addition, as shown in  FIG. 2 , the spring  42  has, at one part of the outer periphery of the central portions  42   b , a connection pin  42   c  formed so as to be bent toward a side of the holder  43 . 
     This connection pin  42   c  plays a role as a terminal electrically connected to the later-described flexible wiring board  44  by a conductive member such as solder. 
     In other words, the spring  42  electrically connects the frame  41   a  and the flexible wiring board  44 . 
     (Holder) 
     The holder  43  is provided at the frame  41   a.    
     As shown in  FIG. 2 , this holder  43  has a placement part  43   a  arranged on an opening part  41   d  of a frame  41   a  and a pair of supporting parts  43   b  supporting the placement part  43   a  to the frame  41   a.    
     The placement part  43   a  is supported by the supporting parts  43   b  to the frame  41   a.    
     This pair of supporting parts  43   b  extends from the placement part  43   a  toward an outside of the opening part  41   d  and extends along an outer peripheral surface of the frame  41   a.    
     The holder  43  is formed with, for example, an insulating material such as an insulating resin. 
       FIG. 4  is a perspective view of the motor  40 . 
     In  FIG. 4 , a state with the worm gear  31  attached to the shaft of the motor  40  is shown. 
     In addition,  FIG. 4  also shows the flexible wiring board  44 . 
     As shown in  FIG. 4 , the placement part  43   a  of the holder  43  is a part with one part of the flexible wiring board  44  placed. 
     In detail, the placement part  43   a  is a part with a first connection part  44   a  placed, the first connection part  44   a  electrically connected to the terminals  41   b  of the motor body  41  of the flexible wiring board  44 . 
     Thus, the flexible wiring board  44  is placed at the holder  43 . 
     Therefore, the placement part  43   a  has hole parts  43   aa  for leading out the terminals  41   b  connected to the first connection part  44   a . The terminals  41   b  pass through the hole parts  43   aa , and one end portion (first end portion) of each of the terminals  41   b  is led out from a surface of a side of the placement part  43   a  opposite to a surface of a side of the frame  41   a  with the first connection part  44   a  arranged. 
     Thus, the terminals  41   b  pass through the holder  43  and are electrically connected to the flexible wiring board  44 . 
     In the present embodiment, since the motor body  41  has the four terminals  41   b , the four hole parts  43   aa  are formed in the placement part  43   a  in positions corresponding to the four terminals  41   b.    
     In addition, as shown in  FIG. 3 , the placement part  43   a  plays a role also as a reception part receiving the pair of projecting parts  42   ba  formed at the central portions  42   b  of the spring  42  by a surface of the placement part  43   a  on the side of the frame  41   a.    
     On the other hand, as shown in  FIG. 3 , the holder  43  is provided with U-shaped recessed parts  43   ab  opened toward a central side of the placement part  43   a  in portions connecting the placement part  43   a  and the supporting parts  43   b.    
     These recessed parts  43   ab  are formed in a surface of the holder  43  on the side of the frame  41   a.    
     As shown in  FIG. 2 , inside the opening part  41   d  of the frame  41   a , a guide part  41   e  arranged so as to surround the terminals  41   b  is provided. The above-mentioned recessed parts  43   ab  are formed each in a size allowing engagement with this guide part  41   e.    
     This guide part  41   e  serves as a contact part contacting the recessed parts  43   ab  or a positioning part for the recessed parts  43   ab.    
     The guide part  41   e  is formed with a member of an insulator, and the terminals  41   b  are press-fitted into the insulator and fixed. 
     This guide part  41   e  serves as a contact part contacting the recessed parts  43   ab  or a positioning part for the recessed parts  43   ab.    
     Therefore, as shown in  FIG. 4 , when the holder  43  is placed on the frame  41   a , this guide part  41   e  engages with the recessed parts  43   ab  of the holder  43  and inhibits movement of the holder  43  in such a direction as to be away from the frame  41   a  and in a direction orthogonal to the frame  41   a.    
     It is not necessary for this guide part  41   e  to be a part press-fitted into the recessed parts  43   ab , and it is only required for the guide part  41   e  to be capable of inhibiting large movement of the holder  43 . 
     (Flexible Wiring Board) 
     The flexible wiring board  44  is a member for electrically connecting the terminals  41   b  of the motor body  41  and the above-mentioned internal connection terminals (not shown) provided at the circuit board  50  to one another. 
     Therefore, as shown in  FIG. 2 , the flexible wiring board  44  includes the first connection part  44   a  electrically connected to the terminals  41   b , a second connection part  44   b  connected to the internal connection terminals (not shown) of the circuit board  50 , and a wiring part  44   c  connecting the first connection part  44   a  and the second connection part  44   b  to each other. 
     As shown in  FIG. 2 , the first connection part  44   a  is provided with four hole parts in positions corresponding to the four terminals  41   b  of the motor body  41 . 
     On the respective peripheries of the four hole parts, lands  44   aa  for electrically connecting to the terminals  41   b  are provided by using a conductive member such as solder. 
     On the other hand, as shown in  FIG. 3 , the second connection part  44   b  is provided with four hole parts, the four internal connection terminals (not shown) of the circuit board  50  inserted into the four hole parts, the four internal connection terminals (not shown) of the circuit board  50  electrically connected to the four terminals  41   b  of the motor body  41 . 
     On the respective peripheries of the four hole parts of the second connection part  44   b , lands  44   ba  for electrically connecting to the internal connection terminals (not shown) are provided by using solder or the like. 
     In addition, the respective lands  44   aa  and the respective lands  44   ba  are electrically connected to one another by conductive patterns (not shown) formed at the wiring part  44   c  or the like. 
     As shown in  FIG. 2 , the first connection part  44   a  of the flexible wiring board  44  is also provided with a hole part in a position corresponding to the connection pin  42   c  of the spring  42 , the connection pin  42   c  inserted into the hole part. Also on the periphery of the hole part, a land  44   ab  for electrically connecting to the connection pin  42   c  is provided by using the conductive member such as the solder. 
     As shown in  FIG. 3 , the second connection part  44   b  of the flexible wiring board  44  is provided with a hole part, a ground terminal (not shown) of the circuit board  50  inserted into the hole part. On the periphery of the hole part, a land  44   bb  electrically connected to the land  44   ab  (see  FIG. 2 ) is provided by using a conductive pattern (not shown) formed at the wiring part  44   c  or the like. 
     The conductive patterns connecting the lands  44   aa  and the lands  44   ba  to one another and formed at the wiring part  44   c  are not electrically connected to the conductive pattern connecting the land  44   ab  and the land  44   bb  to each other and formed at the wiring part  44   c.    
     Accordingly, the spring  42  is capable of electrically connecting to a ground of the circuit board  50  via the flexible wiring board  44 . 
     When the spring  42  is electrically connected to the ground of the circuit board  50 , the spring  42  is brought to have the same potential as a potential of the ground of the circuit board  50 . 
     In addition, by connecting an external apparatus to external connection terminals, the ground of the circuit board  50  is brought to have the same potential as a potential of a ground of the external apparatus. 
     Next, procedures and the like for attaching the spring  42 , the holder  43 , and the flexible wiring board  44  onto the motor body  41  will be described and further detailed description will be set forth. 
     As shown in  FIG. 4 , the spring  42 , the holder  43 , and the first connection part  44   a  of the flexible wiring board  44  are arranged so as to be positioned in the order of the spring  42 , the holder  43 , and the first connection part  44   a  from the side of the frame  41   a  of the motor body  41 . 
     At this time, the terminals  41   b  of the motor body  41  are arranged so as to be led out from the hole parts  43   aa  (see  FIG. 2 ) formed in the placement part  43   a  of the holder  43  and the hole parts (with the lands  44   aa  formed) of the first connection part  44   a.    
     At this time, the connection pin  42   c  of the spring  42  is also brought to be led out from the corresponding hole part (with the land  44   ab  formed) of the first connection part  44   a.    
     Here, as shown in  FIG. 4 , when only the spring  42 , holder  43 , and first connection part  44   a  are arranged, the holder  43  and the first connection part  44   a  are biased in such a direction as to be away from the frame  41   a  by a biasing force of the elastic parts  42   a  of the spring  42  contacting the frame  41   a.    
     Therefore, by fixing the holder  43  and the first connection part  44   a  to the frame  41   a  and biasing the spring  42  to a side of the frame  41   a , the supporting parts  43   b  of the holder  43  are brought to contact the frame  41   a  via the opening  42   e  inside the spring  42 . 
     At this time, the elastic parts  42   a  of the spring  42  are elastically deformed, and the spring  42  is brought to firmly contact the frame  41   a.    
     With the supporting parts  43   b  of the holder  43  contacting the frame  41   a , a first fixing part (not shown) for fixing, by using the conductive member such as the solder, to each of the lands  44   aa  of the first connection part  44   a , a first end portion of each of the terminals  41   b  in the placement part  43   a  and the first connection part  44   a  led out to a side opposite to the frame  41   a  (a portion of each of the terminals  41   b  extending out from each of the hole parts shown in  FIG. 4 ) through each of the hole parts (with lands  44   aa  formed) is formed. 
     At this time, the connection pin  42   c  of the spring  42  is also fixed to the land  44   ab  of the first connection part  44   a  by using the conductive member such as the solder. 
     The first fixing part formed as described above not only electrically connects the first connection part  44   a  of the flexible wiring board  44  and each of the terminals  41   b  but also plays a role of inhibiting the movement of the holder  43  in such a direction as to be away from the frame  41   a  by the biasing force of the spring  42 . 
     Thus, since the holder  43  does not move in such a direction as to be away from the frame  41   a , the elastic parts  42   a  of the spring  42  are kept in the elastically deformed state, and the spring  42  continues to contact the frame  41   a.    
     As described above, since both of the spring  42  and the frame  41   a  are formed with the conductive member, when the spring  42  contacts the frame  41   a , the frame  41   a  and the spring  42  are short-circuited. 
     Accordingly, since the frame  41   a  is also brought to be electrically connected to the ground of the circuit board  50  via the flexible wiring board  44 , the frame  41   a  comes to have the same potential as the potential of the ground of the circuit board  50  and to play a role as an electromagnetic shield. 
     Therefore, emission of electromagnetic noise generated inside the motor body  41  to the outside of the motor  40  is inhibited. 
     On the other hand, since the first connection part  44   a  of the flexible wiring board  44  is inhibited from moving to the side of the frame  41   a  by the holder  43 , stress exerted on the first fixing part is inhibited, and a crack and the like caused in the first fixing part can be inhibited. 
     Because the biasing force of the spring  42  is exerted on the first fixing part, due to this influence, breakage of the first fixing part may be caused. 
     Accordingly, it is better for the biasing force of the spring  42  to be too strong. When the holder  43  is brought to be fixed by the first fixing part so as not to move in such a direction as to be away from the frame  41   a , it is preferable that a spring force exhibited by one of the elastic parts  42   a  is less than or equal to 80 gf and it is more preferable that the spring force exhibited by one of the elastic parts  42   a  is less than or equal to 70 gf. 
     The spring force referred to herein is a force exhibited by one of the elastic parts  42   a  when the supporting parts  43   b  of the holder  43  are brought to contact the frame  41   a.    
     By employing the above-described configuration, the frame  41   a  can be easily connected to the ground of the circuit board  50  by utilizing the flexible wiring board  44  for electrically connecting the terminals  41   b  of the motor body  41  and the internal connection terminals (not shown) of the circuit board  50  to one another. 
     Moreover, since by the extremely simple configuration attained by providing the side of the frame  41   a  of the holder  43  with the spring  42 , the frame  41   a  can be electrically connected to the flexible wiring board  44 , cost is hardly increased, and it is made possible to inhibit the emission of the electromagnetic noise to the outside of the motor  40 . 
     The frame  41   a  may forms an electromagnetic shield. 
     Second Embodiment 
     Next, a second embodiment according to the present disclosure will be described. 
     Since also in the second embodiment, a basic configuration is similar to the basic configuration of the first embodiment, hereinafter, points differing from the first embodiment will be mainly described, and the description as to the configuration similar to the configuration of the first embodiment may be omitted. 
       FIG. 5  is a partially exploded perspective view of a motor  40  in the second embodiment. 
     In  FIG. 5 , a state with a worm gear  31  attached to a shaft of a motor  40  is shown. 
     In addition, a flexible wiring board  44  is also shown in  FIG. 5 . 
     In addition,  FIG. 6  is a perspective view showing a state with a spring  42 , a holder  43 , and the flexible wiring board  44  in the second embodiment assembled. 
       FIG. 6  is the perspective view, viewed from a side of a frame  41   a  when the spring  42 , the holder  43 , and the flexible wiring board  44  are attached to the frame  41   a.    
     As shown in  FIG. 5 , a motor body  41  and the flexible wiring board  44  are similar to those in the first embodiment, and in the second embodiment, the holder  43  and the spring  42  are different from those in the first embodiment. 
     The holder  43  in the second embodiment is provided with a fixing part  43   c  extending sideways from a placement part  43   a  (see  FIG. 2 ) in the first embodiment and fixing the spring  42 . 
     More specifically, supposing that a direction of alignment of a pair of supporting parts  43   b  is a first direction (see a Z axis), the holder  43  in the second embodiment is provided with the fixing part  43   c  formed in a direction (second direction) orthogonal to this first direction so as to extend from the placement part  43   a.    
     A plane formed by this first direction and the second direction is along one surface of the placement part  43   a.    
     The fixing part  43   c  is provided with a hole part  43   ca  for inserting a connection pin  42   c  of the spring  42 . 
     In addition, as shown in  FIG. 6 , the fixing part  43   c  on the side of the frame  41   a  is provided with a circular protruding part  43   cb  projecting toward the side of the frame  41   a  and fixing the spring  42 . 
     On the other hand, the spring  42  has a contact part  42   d  received by a surface of the fixing part  43   c  on the side of the frame  41   a  and one elastic part  42   a  bent from the contact part  42   d  toward the side of the frame  41   a.    
     In addition, the spring  42  has the connection pin  42   c  provided at one part of the outer periphery of the contact part  42   d  and bent toward a side away from the frame  41   a.    
     The contact part  42   d  is provided with a circular hole part  42   da  fitted to the protruding part  43   cb  of the fixing part  43   c.    
     In order to facilitate fitting of the circular hole part  42   da  to the protruding part  43   cb  of the fixing part  43   c , a slit is formed from the outer periphery of the contact part  42   d  toward the hole part  42   da  of the contact part  42   d.    
     Even by configuring the holder  43  and the spring  42  as described above, as in the first embodiment, the connection pin  42   c  of the spring  42  is electrically connected to a land  44   ab  of the flexible wiring board  44  by using a conductive member such as solder, and the spring  42  connected to the land  44   ab  can be caused to contact the frame  41   a.    
     Accordingly, as in the first embodiment, the frame  41   a  is electrically connected to a ground of a circuit board  50  via the flexible wiring board  44  and is made to serve as an electromagnetic shield. 
     Thus, also in the second embodiment, emission of electromagnetic noise generated inside the motor body  41  to the outside of the motor  40  can be inhibited. 
     Hereinbefore, the present disclosure is described based on the embodiments. However, the present disclosure is not limited to the embodiments, and it is needless to say that various modifications within the scope not departing from the gist of the present disclosure should be possible. 
     For example, the motor  40  may be used in an apparatus other than a rotary apparatus  10 . 
     Also in this case, by electrically connecting the frame  41   a  to an external ground via the flexible wiring board  44 , emission of electromagnetic noise to the outside of the motor  40  can be inhibited. 
     The spring in the above-described embodiment is a plate-like spring formed with a conductive member, and both end portions of the spring are elastic parts or bent parts formed by bending a plate member. 
     The spring is not limited to this and may be a plate-like spring having a wholly curved shape. 
     Specifically, the plate-like spring is curved convexly toward the holder from one end portion to another end portion of the spring. 
     Surfaces of the two end portions facing the frame contact the frame. 
     A central portion of the spring is supported by the holder, and a biasing force of the spring exerted from the frame toward the holder is inhibited by the holder. 
     Thus, the flexible wiring board is prevented from floating up in a direction from the frame toward the holder due to the spring. Connection failure of the flexible wiring board with terminals, caused by this floating-up of the flexible wiring board, can be prevented from occurring. 
     Accordingly, various modifications within the scope not departing from the gist of the present disclosure as described above are also embraced within the technical scope of the present disclosure, and this is apparent for those skilled in the art from the description of the appended claims. 
     Third Embodiment 
     Next, a third embodiment according to the present disclosure will be described with reference to  FIG. 7  to  FIG. 9 . 
     Since also in the third embodiment, a basic configuration is similar to the basic configuration of the first embodiment, hereinafter, points differing from the first embodiment will be mainly described, and the description as to the configuration similar to the configuration of the first embodiment may be omitted. As a side surface, an end surface and an outer peripheral side surface are included. 
       FIG. 7  is a perspective view showing a configuration of a motor  40  in the third embodiment. In  FIG. 7 , unlike in the first embodiment, a state with a flexible wiring board  84  and a frame  41   a  electrically connected via the later-described spring  71  is shown. To facilitate illustration,  FIG. 8  shows a state with the flexible wiring board  84  removed.  FIG. 9  is a partially exploded perspective view showing a configuration of the motor  40 .  FIG. 10  is a sectional view showing one part of the motor  40 . 
     In the motor  40  in the third embodiment, instead of a flexible wiring board  44  in each of the first and second embodiments, the flexible wiring board  84  is used and instead of a spring  42 , the spring  71  is used. 
     The flexible wiring board  84  has the same basic structure as the basic structure of the flexible wiring board  44  and has the same lands  84   aa  as the lands  44   aa  and the same land  84   ab  as the land  44   ab  of said flexible wiring board  44 . However, an interval between the lands  84   aa  and the land  84   ab  is wider than an interval between the lands  44   aa  and the land  44   ab . In addition, as similar to the flexible wiring board  44 , the flexible wiring board  84  is provided with a second connection part  84   b , lands  84   ba  (not shown), a land  84   bb  (not shown), and a wiring part  84   c  respectively corresponding to a second connection part  44   b , lands  44   ba , a land  44   bb , and a wiring part  44   c.    
     The spring  71  is supported to the frame  41   a , with the spring  71  arranged between an end surface  41   abm  in an axis direction of a second frame  41   ab  of the frame  41   a  of a motor body  41  and a disk-shaped lid body  61  covering the end surface  41   abm  of the second frame  41   ab.    
     Specifically, the spring  71  is a flat substantially disk-shaped thin plate-like member (hereinafter, also referred to as a “flat plate-like member”) having an external diameter smaller than an external diameter of the second frame  41   ab  and same as or slightly smaller than a diameter of the lid body  61 . However, the spring  71  is not limited to the disk-shaped spring, it is only required for the spring  71  to be the flat plate-like member, and the spring  71  may be of other shape such as a rectangular shape. The shapes of the first frame  41   aa  and the second frame  41   ab  are not limited to cylindrical shapes and may be square tube shapes or the like. Also in this case, an outer shape of the spring  71  is smaller than an outer shape of the second frame  41   ab . The spring  71  has a portion formed to be ring-shaped, elastic parts projecting from the portion formed to be ring-shaped toward an inside of the spring  71  and having elasticity, and a through-hole  71   h  allowing a shaft  41   j  of the motor body  41  to be inserted into the central portion of the spring  71 . The through-hole  71   h  has an external diameter larger than a diameter of the shaft  41   j . The through-hole  71   h  and the later-described gaps  75  are surrounded by an inner peripheral part  71   c  of the spring  71  and formed as one part of an opening part of the spring  71 . 
     In the spring  71 , a plurality of the gaps  75  radially extending with the through-hole  71   h  being the center so as to each have a predetermined length are formed. The plurality of gaps  75  are formed in the spring  71  at regular intervals in a circumferential direction. Respectively between the plurality of gaps  75 , elastic portions  76  are formed. The plurality of elastic portions  76  radially extend toward the through-hole  71   h  in a radial direction. The plurality of elastic portions  76  are capable of warping toward the lid body  61  in a direction of the shaft. In other words, the spring  71  has the plurality of elastic portions  76  warping in the direction of the shaft and being flexible respectively between the gap  75  and the gap  75 . 
     The motor  40  in the third embodiment is further provided with a supporting member  77  rotatably supporting the shaft  41   j  to the lid body  61 . This supporting member  77  is inserted or fitted into an opening part  61   a  provided in a central portion of the lid body  61 . Inside the supporting member  77 , a recessed part  77   a  is provided, and the shaft  41   j  is inserted into the recessed part  77   a . An end portion of the shaft  41   j  is rotatably arranged inside the recessed part  77   a . In addition, an outer peripheral portion of the supporting member  77  contacts the elastic portions  76  forming the through-hole  71   h  of the spring  71  and is supported by the elastic portions  76 . An outer peripheral portion  71   b  of the spring  71  is arranged between an outer peripheral portion of the lid body  61  and the second frame  41   ab  and is fixed to the second frame  41   ab . In addition, in the direction of the shaft, the elastic portions  76  of the spring  71  are warped from the end surface  41   abm  of the second frame  41   ab  toward the lid body  61 , and end portions of the elastic portions  76  are located closer to a side of the lid body  61  than the outer peripheral portion of the spring  71 . The warped elastic portions  76  of the spring  71  bias the shaft  41   j  toward an inside of the frame  41   a  via the supporting member  77 . 
     The spring  71  has a projecting part  73  in the radial direction, extending from an outer peripheral edge of the spring  71  toward the outside (in such a direction as to be away from the frame  41   a ). This projecting part  73  has a bent shape having a first bent part  73   a  bent along the end surface  41   abm  and an outer peripheral side surface of the second frame  41   ab  and a second bent part  73   b  bent from the outer peripheral side surface of the frame  41   a  toward the flexible wiring board  84 . The projecting part  73  has a connection pin  73   c  electrically connected to the flexible wiring board  84  and a coupling part (the first bent part  73   a  and the second bent part  73   b ) coupling the connection pin  73   c  and the outer peripheral edge of the spring  71 . In the projecting part  73 , the connection pin  73   c  may include the first bent part  73   a  and the second bent part  73   b , the coupling part may include the first bent part  73   a  and the second bent part  73   b , and the coupling part may include the first bent part  73   a  and the connection pin  73   c  may include the second bent part  73   b.    
     Hereinafter, an example with the connection pin  73   c  including the second bent part  73   b  and with the second bent part  73   b  provided between the connection pin  73   c  and the first bent part  73   a  will be described. 
     Specifically, the spring  71  has the projecting part  73  projecting from the outer peripheral edge of said spring  71  to the outside. The projecting part  73  projects from the outer peripheral edge of the spring  71  in a direction perpendicular to the axis direction and is an L-shaped conductive member having the first bent part  73   a  bent along the end surface  41   abm  and the outer peripheral side surface of the second frame  41   ab , the second bent part  73   b  bent from the outer peripheral side surface of the frame  41   a  toward the flexible wiring board  84 , and the connection pin  73   c  formed integrally with the second bent part  73   b.    
     As with the connection pin  42   c  in the first and second embodiments, this projecting part  73  also plays a role as a terminal electrically connected to the flexible wiring board  84  by using the solder or the like. In other words, the projecting part  73  electrically connects the frame  41   a  and the flexible wiring board  84 . In this case, the projecting part  73  of the spring  71  and the land  84   ab  of the flexible wiring board  84  are electrically connected. 
     The spring  71  having the configuration as described above is supported to the second frame  41   ab , being arranged and sandwitched between the end surface  41   abm  of the second frame  41   ab  and the lid body  61 , with the shaft  41   j  of the motor body  41  inserted into the through-hole  71   h  together with the supporting member  77 . 
     At this time, the plurality of elastic portions  76  of the spring  71  are biasing the supporting member  77 . In other words, the shaft  41   j  is biased toward an inside of the second frame  41   ab  by an elastic force of the plurality of elastic portions  76  and thus, the movement of the shaft  41   j  in the direction of the shaft can be inhibited. As a result of this, even when the motor body  41  rotates the shaft  41   j , the spring  71  is made possible to inhibit vibration of the motor and generation of sound. 
     Further, since the second frame  41   ab  is brought to be electrically connected to the land  84   ab  of the flexible wiring board  84  via the connection pin  73   c  of the spring  71 , the frame  41   a  comes to have the same potential as a potential of a ground of a circuit board  50  and thus, is capable of playing a role as an electromagnetic shield. Hence, emission of electromagnetic noise generated inside the motor body  41  to the outside of the motor  40  can be inhibited. 
     In addition, the present disclosure is not limited to the above-described embodiments. Embodiments configured by appropriately combining the above-described components are also embraced in the present disclosure. In addition, further effects and variants can be easily derived by those skilled in the art. Hence, broader aspects of the present disclosure are not limited to the above-described embodiments, and various modifications should be possible.