Patent Publication Number: US-2021181693-A1

Title: Watch Component And Electronic Watch

Description:
The present application is based on, and claims priority from JP Application Serial Number 2019-225195, filed Dec. 13, 2019, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a watch component and an electronic watch. 
     2. Related Art 
     JP-A-2016-125989 discloses a radio watch including a movement including a magnetic shield plate and a motor. In JP-A-2016-125989, the magnetic shield plate is disposed to overlap at least a portion of the motor in plan view of the movement in order to suppress the adverse influence of external magnetic fields on the motor. Further, in JP-A-2016-125989, an antenna core and the magnetic shield plate are disposed at a predetermined distance from each other in plan view in order to suppress a situation where radio waves are absorbed at the magnetic shield plate and the reception sensitivity of the antenna is reduced. Specifically, in JP-A-2016-125989, the magnetic shield plate is disposed such that the influence of external magnetic fields on the motor can be suppressed and that reduction in reception sensitivity of the antenna can be suppressed. 
     In JP-A-2016-125989, however, the number of components is disadvantageously increased since the magnetic shield plate is required to be provided, for components that can be influenced by external magnetic fields such as motors, in order to suppress the influence. 
     SUMMARY 
     A watch component of the present disclosure includes a first region including a first soft magnetic layer composed of a ferrite phase, a first non-magnetic layer composed of an austenized phase in which the ferrite phase is austenized, and a first mixed layer in which the ferrite phase and the austenized phase are mixed, the first mixed layer being formed between the first soft magnetic layer and the first non-magnetic layer, and a second region including a second non-magnetic layer composed of the austenized phase, the second non-magnetic layer having a thickness greater than that of the first non-magnetic layer. 
     A watch of the present disclosure includes the above-described watch component. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a front view illustrating an electronic watch of a first embodiment of the present disclosure. 
         FIG. 2  is a plan view illustrating a main portion of the electronic watch of the first embodiment. 
         FIG. 3  is a side view of the electronic watch as viewed from an axial direction of an antenna. 
         FIG. 4  is a cross-sectional view illustrating a main portion of a case body according to the first embodiment. 
         FIG. 5  is a schematic diagram illustrating a manufacturing process of the case body of the first embodiment. 
         FIG. 6  is a schematic diagram illustrating a manufacturing process of the case body of the first embodiment. 
         FIG. 7  is a schematic diagram illustrating a manufacturing process of the case body of the first embodiment. 
         FIG. 8  is a cross-sectional view illustrating a main portion of a case body of a second embodiment. 
         FIG. 9  is a cross-sectional view illustrating a main portion of a case body of a third embodiment. 
         FIG. 10  is a cross-sectional view illustrating a main portion of a case body of a fourth embodiment. 
         FIG. 11  is a plan view illustrating a main portion of an electronic watch of a fifth embodiment. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     First Embodiment 
     An electronic watch  1  of a first embodiment of the present disclosure will be described below with reference to the drawings. 
       FIG. 1  is a front view illustrating the electronic watch  1  of this embodiment. In this embodiment, the electronic watch  1  is configured as a wrist watch that is worn on the user&#39;s wrist. 
     As illustrated in  FIG. 1 , the electronic watch  1  includes a metal case  10 . In addition, the case  10  includes a case body  100  formed in a substantially ring shape, a cover glass  11  mounted on a front surface side of the case body  100 , and a case back (not illustrated) removably attached to the back surface side of the case body  100 . Note that the case body  100  is an example of the watch component of the present disclosure. 
     In addition, the electronic watch  1  includes a disk-shaped dial  2 , a second hand  3 , a minute hand  4 , an hour hand  5 , a crown  6 , an A-button  7  and a B-button  8 , which are disposed inside the case  10 . 
     In this embodiment, the electronic watch  1  is configured as a radio watch that can receive a long-wavelength standard radio wave as a radio wave including time information, and can correct the indication positions of the second hand  3 , the minute hand  4  and the hour hand  5  on the basis of the received time information. 
       FIG. 2  is a plan view illustrating a main portion of the electronic watch  1 . Specifically, the plan view illustrates a main portion of the electronic watch  1  in the state where the cover glass  11  and the dial  2  illustrated in  FIG. 1  are removed. 
     As illustrated in  FIG. 2 , the antenna unit  9  is housed in the case body  100 . 
     In addition, motors  81  and  82 , a secondary battery  83 , and a circuit board and a wheel train (not illustrated), and the like, are housed in the case body  100 . 
     Antenna Unit 
     The antenna unit  9  includes an antenna  20 , a first antenna frame  40 , and a second antenna frame  50 . 
     The antenna  20  is composed of an antenna core  21  and a coil  25  wound on the antenna core  21 . That is, the antenna  20  is configured as a coil antenna. 
     In addition, in this embodiment, the antenna  20  is configured as a bar antenna in which the coil winding of the antenna core  21  is formed in a straight-line shape. 
     The antenna core  21  is, for example, a member obtained by die-cutting a cobalt-based amorphous metal foil as a magnetic foil material, or a member obtained by stacking, in the thickness direction of the electronic watch 1, 10 to 30 sheets formed by etching and then performing thermal treatment such as annealing to stabilize the magnetic properties. In addition, the antenna core  21  includes a first lead  23  and a second lead  24 . 
     Note that a magnetic collecting plate may be attached to the surface of the first lead  23  and the second lead  24  in order to improve the reception performance of the antenna  20 . 
     The magnetic collecting plate can be formed by laminating several magnetic foil members composed of amorphous sheets, for example. Examples of the magnetic foil member include a cobalt-based amorphous metal and an iron-based amorphous metal. 
     The first antenna frame  40  is a member made of a synthetic resin and is a member that holds the antenna core  21 . As with the first antenna frame  40 , the second antenna frame  50  is a member made of a synthetic resin and is a member that holds the antenna core  21 . 
     That is, in this embodiment, the antenna core  21  is held by the first antenna frame  40  and the second antenna frame  50 . 
     Case Body  100   
       FIG. 3  is a side view as viewed from an axial direction O of the antenna  20 . Here, the axial direction O of the antenna  20  is the longitudinal direction of the antenna core  21 , and refers to a direction orthogonal to the direction in which the directivity of radio wave reception is highest in the antenna  20 . 
     As illustrated in FIGS .  2  and  3 , the case body  100  is composed of an austenized ferritic stainless steel including a first region  110  and a second region  120 . Note that, in this embodiment, the first region  110  and the second region  120  are regions ranging from a first surface  101 , which is the outer surface, to a second surface  102 , which is the inner surface opposite the first surface  101 , in the case body  100  as illustrated in  FIG. 2 . That is, the second region  120  is a region defined by virtual lines M and N, the first surface  101 , and the second surface  102  illustrated in  FIG. 2  in the case body  100 . In this embodiment, as the second region  120 , two regions are disposed along the axial direction O on the opposite sides with the antenna  20  therebetween. The first region  110  is the region other than the second region  120  in the case body  100 . 
     The first region  110  is a region that has magnetic resistance and blocks external magnetic fields and the like in the case body  100 . Thus, in the case body  100 , the motors  81  and  82 , the secondary battery  83  and the like disposed at positions corresponding to the first region  110  are less influenced by external magnetic fields. 
     The second region  120  is a region configured to be able to transmit radio waves such as a long-wavelength standard radio wave in the case body  100 . It is disposed at a position overlapping the antenna  20  in a side view as viewed from the axial direction O of the antenna  20  as illustrated in  FIG. 3  in this embodiment. In addition, the second region  120  is configured to have a cross-sectional area greater than that of the antenna core  21  in the side view. 
     In this manner, in this embodiment, the case body  100  includes the first region  110  configured to block external magnetic fields and the like and the second region  120  configured to be able to transmit radio waves. 
     First Region 
       FIG. 4  is a cross-sectional view of a main portion of the case body  100  taken along a direction parallel to the dial  2 . Note that  FIG. 4  illustrates an enlarged view of the first region  110  and the second region  120  disposed with the virtual line M therebetween in  FIG. 2  in the case body  100 . 
     As illustrated in  FIG. 4 , the first region  110  of the case body  100  includes a first soft magnetic layer  111  composed of a ferrite phase, and a first non-magnetic layer  112  composed of an austenite phase in which the ferrite phase is austenized (hereinafter referred to as “austenized phase”) , and a first mixed layer  113  in which the ferrite phase and the austenized phase are mixed between the first soft magnetic layer  111  and the first non-magnetic layer  112 . 
     In this embodiment, the first non-magnetic layer  112  and the first mixed layer  113  are provided on the first surface  101  side with respect to the first soft magnetic layer  111 . Further, the first non-magnetic layer  112  and the first mixed layer  113  are provided also on the second surface  102  side with respect to the first soft magnetic layer  111 . In other words, the first soft magnetic layer  111  is provided between the first mixed layers  113  in the thickness direction of the case body  100 . The first mixed layers  113  are provided between the first soft magnetic layer  111  and the first non-magnetic layers  112 . In other words, in the direction from the first surface  101  side toward the second surface  102  side, the first non-magnetic layer  112 , the first mixed layer  113 , the first soft magnetic layer  111 , the first mixed layer  113 , and the first non-magnetic layer  112  are stacked in this order. 
     In addition, as illustrated in  FIGS. 2 and 4 , each of the first region  110  and the second region  120  has a thickness of t 1 . In other words, the first region  110  and the second region  120  are configured to have thicknesses equal to each other. Note that the thickness t 1  of the first region  110  and the second region  120 , i.e., the thickness t 1  of the case body  100 , is approximately 4 mm, for example. 
     First Soft Magnetic Layer 
     As described above, the first soft magnetic layer  111  is composed of a ferrite phase. In this manner, the first soft magnetic layer  111  has magnetic resistance. 
     In this embodiment, the first soft magnetic layer  111  is composed of a ferritic stainless steel that contains, by mass %, 18 to 22% Cr, 1.3 to 2.8% Mo, 0.05 to 0.50% Nb, 0.1 to 0.8% Cu, less than 0.5% Ni, less than 0.8% Mn, less than 0.5% Si, less than 0.10% P, less than 0.05% S, less than 0.05% N, and less than 0.05% C, with the remainder composed of Fe and unavoidable impurities. Note that the first soft magnetic layer  111  is not limited to the above-described configuration as long as the first soft magnetic layer  111  is composed of a ferrite phase. 
     In addition, in this embodiment, the first region  110  is configured such that the first soft magnetic layer  111  has a thickness a of 100 μm or greater. In this manner, the first region  110  has a predetermined magnetic resistance required as a watch. 
     First Non-Magnetic Layer 
     The first non-magnetic layer  112  is formed by subjecting the base material forming the first soft magnetic layer  111  to a nitrogen absorption treatment such that the ferrite phase is austenized. 
     In this embodiment, a thickness b of the first non-magnetic layer  112  provided on the first surface  101  side is set to approximately 350 μm, and a thickness c of the first non-magnetic layer  112  provided on the second surface  102  side is set to approximately 350 μm. In other words, in this embodiment, the first region  110  is configured such that the thickness b of the first non-magnetic layer  112  provided on the first surface  101  side and the thickness c of the first non-magnetic layer  112  provided on the second surface  102  side are substantially equal to each other. 
     Note that the thicknesses b and c of the first non-magnetic layers  112  are the thicknesses of the layers composed of the austenized phase, and are the shortest distances from the first surface  101  or the second surface  102  to the ferrite phase of the first mixed layer  113  in the field of view in SEM observation at a magnification of 500 to 1000. Alternatively, they are the austenized phases closest from the first surface  101  or the second surface  102 . In addition, the thickness of the first non-magnetic layer  112  may be set to an average value of the distances measured at a plurality of points where the distance from the first surface  101  or the second surface  102  to the ferrite phase is short. 
     In addition, in this embodiment, the content of nitrogen in the first non-magnetic layer  112  is 1.0 to 1.6% by mass % 
     Note that the first non-magnetic layer  112  is not limited to the above-described configuration. For example, the first non-magnetic layer  112  may be configured to have a thickness of 350 μm or greater, or may be configured to have a thickness of 350 μm or smaller as long as the first non-magnetic layer  112  is provided in accordance with the hardness and corrosion resistance required as a watch. 
     First Mixed Layer 
     The first mixed layer  113  is formed by a variation in the transfer rate of nitrogen entering the first soft magnetic layer  111  composed of the ferrite phase in the process of forming the first non-magnetic layer  112 . Specifically, at the portion where the transfer rate of nitrogen is high, nitrogen enters into a deep portion in the ferrite phase to austenize it, whereas at a portion where the transfer rate of nitrogen is low, the ferrite phase is austenized only in a shallow portion, and thus, the first mixed layer  113  in which the ferrite phase and the austenized phase are mixed with respect to the depth direction is formed. Note that the first mixed layer  113  is a layer including the shallowest part to the deepest part of the austenized phase in a cross-sectional view, and is a layer thinner than the first non-magnetic layer  112 . 
     Second Region 
     The second region  120  is composed of a second non-magnetic layer  122  composed of an austenized phase. Specifically, in the second region  120 , the second non-magnetic layer  122  is formed from the first surface  101 , which is the outer surface, to the second surface  102 , which is the inner surface, in the case body  100 . In this manner, the second region  120  is configured to be able to transmit radio waves such as a long-wavelength standard radio wave. 
     Second Non-magnetic Layer 
     As with the above-described first non-magnetic layer  112 , the second non-magnetic layer  122  is formed by performing a nitrogen absorption treatment such that the ferrite phase is austenized. 
     Here, in this embodiment, the second non-magnetic layer  122  is provided from the first surface  101  to the second surface  102  in the case body  100  as described above. That is, there is no layer composed of a ferrite phase in the second region  120 . As such, the thickness of the second non-magnetic layer  122  is greater than that of the first non-magnetic layer  112 . 
     In addition, in this embodiment, the content of nitrogen in the second non-magnetic layer  122  is 1.0 to 1.6% by mass % as with the above-described first non-magnetic layer  112 . 
     Manufacturing Method of Case Body 
     Next, a manufacturing method of the case body  100  will be described. 
       FIGS. 5 to 7  are schematic views illustrating manufacturing processes of the case body  100 . 
     As illustrated in  FIG. 5 , first, a ferritic stainless steel is machined to form a base material  200 . At this time, the base material  200  is formed such that the thickness of the portion corresponding to the first region  110  is greater than that of the portion corresponding to the second region  120  by a predetermined length. 
     Next, as illustrated in  FIG. 6 , a nitrogen absorption treatment is performed on the base material  200  machined in the above-mentioned manner. As a result, nitrogen enters the base material  200  from the surface, and the ferrite phase is austenized. At this time, in the portion corresponding to the first region  110 , nitrogen does not completely enter the portion in the nitrogen absorption treatment and the ferrite phase remains by a predetermined thickness since the base material  200  is formed such that the thickness of the portion is greater than that of the portion corresponding to the second region  120 . On the other hand, nitrogen enters the portion corresponding to the second region  120  across the entire layer, and the ferrite phase is austenized. In other words, the nitrogen absorption treatment of this embodiment is performed such that nitrogen enters the portion corresponding to the second region  120  across the entire layer. 
     Finally, as illustrated in  FIG. 7 , the surface side of the base material  200  is cut by a predetermined length and thus the case body  100  as described above is formed. Specifically, in this embodiment, the surface side of the base material  200  is cut such that the thicknesses b and c of the first non-magnetic layers  112  are approximately 350 μm in the first region  110 . In this manner, the case body  100  can achieve the hardness and corrosion resistance required as a watch. 
     Advantageous Effects of First Embodiment 
     According to the first embodiment, the following effects can be achieved. 
     The case body  100  of this embodiment includes the first region  110  including the first soft magnetic layer  111  composed of a ferrite phase, the first non-magnetic layer  112  composed of an austenized phase, and the first mixed layer  113  in which the ferrite phase and the austenized phase are mixed between the first soft magnetic layer  111  and the first non-magnetic layer  112 . Further, the case body  100  includes the second region  120  including the second non-magnetic layer  122  composed of an austenized phase with a thickness greater than that of the first non-magnetic layer  112 . 
     In this manner, in the second region  120 , the thickness of the second non-magnetic layer  122  composed of the austenized phase capable of transmitting radio waves can be increased, and thus transmission of radio waves such as a long-wavelength standard radio wave can be facilitated. Further, in this embodiment, the second region  120  is composed only of the second non-magnetic layer  122  composed of the austenized phase, that is, the second region  120  includes no ferrite phase, and thus transmission of radio waves such as a long-wavelength standard radio wave can be further facilitated. 
     In addition, since the first region  110  includes the first soft magnetic layer  111  composed of the ferrite phase, magnetic resistance can be achieved. That is, in this embodiment, with only a single component as the case body  100 , both the improvement in radio wave reception sensitivity and the improvement in magnetic resistance can be achieved and the need for a magnetic shield plate and the like can be eliminated, and thus, the number of components can be reduced. Note that while a configuration in which the second region  120  includes no ferrite phase is described above, it is also possible to adopt a configuration in which the ferrite phase remains in the second region  120  without forming a layer. In this case, when the ferrite phase remaining in the second region  120  is sufficiently smaller than the ferrite phase of the first region  110 , the above-described effect can be achieved. 
     In this embodiment, the first soft magnetic layer  111  has a thickness a of 100 μm or greater. 
     In this manner, in the first region  110 , a predetermined magnetic resistance required as a watch can be achieved. 
     In this embodiment, the thickness of the first region  110  and the thickness of the second region  120  are equal to each other. 
     In this manner, in the manufacturing process of the case body  100 , the first region  110  and the second region  120  can be simultaneously cut, and thus the ease of the manufacturing of the case body  100  can be increased. 
     In this embodiment, the electronic watch  1  includes the antenna  20  including the antenna core  21 , and the second region  120  is disposed at a position overlapping the antenna  20  in a side view from the axial direction O of the antenna  20 . Further, in the above-described side view, the area of the second region  120  is larger than the cross-sectional area of the antenna core  21 . 
     In this manner, the reception sensitivity of the antenna  20  for receiving radio waves such as a long-wavelength standard radio wave transmitted through the second region  120  of the case body  100  can be increased. 
     Second Embodiment 
     Next, a second embodiment will be described with reference to  FIG. 8 . 
     The second embodiment differs from the above-described first embodiment in that a second soft magnetic layer  121 A and a second mixed layer  123 A are formed in a second region  120 A. 
     Note that the same configurations as those of the case body  100  of the first embodiment are denoted by the same reference signs, and description thereof will be omitted. 
       FIG. 8  is a cross-sectional view illustrating a main portion of a case body  100 A of the second embodiment. 
     As illustrated in  FIG. 8 , the second region  120 A of the case body  100 A includes the second soft magnetic layer  121 A composed of a ferrite phase, a second non-magnetic layer  122 A composed of an austenized phase, and the second mixed layer  123 A in which the ferrite phase and the austenized phase are mixed between the second soft magnetic layer  121 A and the second non-magnetic layer  122 A. 
     As with the second non-magnetic layer  122  of the above-described first embodiment, the second non-magnetic layer  122 A is provided by austenizing the ferrite phase such that the content of nitrogen is 1.0 to 1.6% by mass %. In addition, as in the above-described first embodiment, the thickness of the second non-magnetic layer  122 A is greater than that of the first non-magnetic layer  112 . 
     The second soft magnetic layer  121 A is composed of a ferritic stainless steel similar to that of the first soft magnetic layer  111  of the above-described first embodiment. 
     In addition, as with the first mixed layer  113  of the above-described first embodiment, the second mixed layer  123 A is formed by a variation in the transfer rate of nitrogen entering the second soft magnetic layer  121 A composed of a ferrite phase, and is formed as a mixture of the ferrite phase and the austenized phase with respect to the depth direction. 
     In addition, in this embodiment, the second region  120 A is configured such that a thickness d of a combination of the second soft magnetic layer  121 A and the second mixed layer  123 A is smaller than the thickness a of the first soft magnetic layer  111  of the first region  110 , and is 100 μm or smaller. 
     In this manner, the thickness of the second soft magnetic layer  121 A and the second mixed layer  123 A including the ferrite phase capable of absorbing radio waves can be reduced, and thus the influence on the reception sensitivity of the antenna  20  can be reduced. 
     As described above, in the second region  120 A of this embodiment, the second non-magnetic layer  122 A is not formed across the entire layer of the case body  100 A in the nitrogen absorption treatment, and the second soft magnetic layer  121 A and the second mixed layer  123 A partially remain unlike in the above-described first embodiment. Specifically, in this embodiment, the nitrogen absorption treatment is performed such that the entry depth of nitrogen is smaller than in the above-described first embodiment. 
     Advantageous Effects of Second Embodiment 
     According to the second embodiment, the following effects can be achieved. 
     In this embodiment, the second region  120 A includes the second soft magnetic layer  121 A composed of a ferrite phase, and the second mixed layer  123 A in which the ferrite phase and the austenized phase are mixed between the second soft magnetic layer  121 A and the second non-magnetic layer  122 A. 
     In this manner, when the second non-magnetic layer  122 A is formed by the nitrogen absorption treatment, the entry depth of nitrogen can be reduced, and thus the treatment time of the nitrogen absorption treatment can be reduced. 
     In this embodiment, the thickness d of the combination of the second soft magnetic layer  121 A and the second mixed layer  123 A is 100 μm or smaller. 
     In this manner, the influence on the reception sensitivity of the antenna  20  can be reduced. 
     Third Embodiment 
     Next, a third embodiment will be described with reference to  FIG. 9 . 
     The third embodiment differs from the above-described first embodiment in that in a first region  110 B, a thickness e of a first non-magnetic layer  112 B provided on the first surface  101  side is greater than a thickness f of the first non-magnetic layer  112 B provided on the second surface  102  side. 
     Note that the same configurations as those of the case body  100  of the first embodiment are denoted by the same reference signs, and description thereof will be omitted. 
       FIG. 9  is a cross-sectional view illustrating a main portion of a case body  100 B of the third embodiment. 
     As illustrated in  FIG. 9 , the first region  110 B of the case body  100 B includes a first soft magnetic layer  111 B composed of a ferrite phase, the first non-magnetic layer  112 B composed of an austenized phase, and a first mixed layer  113 B in which the ferrite phase and the austenized phase are mixed between the first soft magnetic layer  111 B and the first non-magnetic layer  112 B. 
     In this embodiment, the first region  110 B is configured such that the thickness e of the first non-magnetic layer  112 B provided on the first surface  101  side is greater than the thickness f of the first non-magnetic layer  112 B provided on the second surface  102  side. Specifically, the thickness e of the first non-magnetic layer  112 B provided on the first surface  101  side is approximately 350 μm, and the thickness f of the first non-magnetic layer  112 B provided on the second surface  102  side is approximately 100 μm. 
     In this manner, the first non-magnetic layer  112 B having a sufficient thickness is provided on the first surface  101  side, which is the outer side of the case body  100 B, and thus the hardness and corrosion resistance required as a watch can be achieved. On the other hand, the thickness of the first non-magnetic layer  112 B can be reduced on the second surface  102  side, which is the inner side of the case body  100 B, and thus the inner space of the case body  100 B can be increased. In this manner, the freedom of the arrangement of components such as the motors  81  and  82 , the secondary battery  83 , and the like can be increased, and the size of the electronic watch  1  can be reduced. 
     Advantageous Effects of Third Embodiment 
     According to the third embodiment, the following effects can be achieved. 
     In this embodiment, the first region  110 B includes the first surface  101  and the second surface  102  located opposite the first surface  101 , and the thickness e of the first non-magnetic layer  112 B provided on the first surface  101  side is greater than the thickness f of the first non-magnetic layer  112 B provided on the second surface  102  side. 
     In this manner, the hardness and corrosion resistance required as a watch can be achieved, and the inner space of the case body  100 B can be increased. Thus, the degree of freedom of the arrangement of components such as the motors  81  and  82  and the secondary battery  83  can be increased, and the size of the electronic watch  1  can be reduced. 
     Fourth Embodiment 
     Next, a fourth embodiment will be described with reference to  FIG. 10 . 
     The fourth embodiment differs from the above-described first embodiment in that the thickness of a first region  110 C and the thickness of a second region  120 C differ from each other in a case body  100 C. 
     Note that the same configurations as those of the case body  100  of the first embodiment are denoted by the same reference signs, and description thereof will be omitted. 
       FIG. 10  is a cross-sectional view illustrating a main portion of the case body  100 C of the fourth embodiment. 
     As illustrated in  FIG. 10 , the case body  100 C includes the first region  110 C and the second region  120 C. 
     As in the above-described first embodiment, the first region  110 C includes a first soft magnetic layer  111 C, a first non-magnetic layer  112 C, and a first mixed layer  113 C. In addition, the second region  120 C includes a second non-magnetic layer  122 C as in the above-described first embodiment. 
     Here, in this embodiment, the case body  100 C is configured such that the thickness of the first region  110 C and the thickness of the second region  120 C are different from each other. 
     Specifically, in the second region  120 C, a first surface  101 C side and a second surface  102 C side are cut more than in the first region  110 C, and a step is formed in the first surface  101 C and the second surface  102 C. In other words, in this embodiment, the second region  120 C is formed to have a thickness smaller than that of the first region  110 C. In this manner, in transmission of radio waves such as a long-wavelength standard radio wave through the second region  120 C, the distance of the portion for transmission through the first region  110 C is reduced, and thus the attenuation of the radio waves can be reduced. 
     Advantageous Effects of Fourth Embodiment 
     According to the fourth embodiment, the following effects can be achieved. 
     In this embodiment, the thickness of the first region  110 C and the thickness of the second region  120 C are different from each other. Specifically, the second region  120 C are provided so as to have a thickness smaller than that of the first region  110 C. 
     In this manner, the attenuation of radio waves such as a long-wavelength standard radio wave can be reduced, and thus the reception sensitivity of the antenna  20  can be further improved. 
     Fifth Embodiment 
     Next, a fifth embodiment will be described below with reference to  FIG. 11 . 
     The fifth embodiment differs from the above-described first embodiment in that a first region  110 D is not disposed in a predetermined range from a center  61 D of a magnetic sensor  60 D in a case body  100 D. 
     Note that the same configurations as those of the case body  100  of the first embodiment are denoted by the same reference signs, and description thereof will be omitted. 
       FIG. 11  is a plan view illustrating a main portion of an electronic watch  1 D of the fifth embodiment. Specifically, the plan view illustrates a main portion of the electronic watch  1 D in the state where the cover glass  11  and the dial  2  illustrated in  FIG. 1  are removed. 
     As illustrated in  FIG. 11 , the electronic watch  1 D includes the magnetic sensor  60 D in the case body  100 D. 
     In this embodiment, the magnetic sensor  60 D is disposed at the 12 o&#39;clock position. In addition, the magnetic sensor  60 D is a triaxial magnetic sensor, and is configured to be able to detect the geomagnetism of the vertical component in addition to the horizontal component. 
     The case body  100 D includes the first region  110 D and a second region  120 D. 
     As in the above-described first embodiment, the first region  110 D includes a first soft magnetic layer, a first non-magnetic layer, and a first mixed layer. 
     The second region  120 D includes a second non-magnetic layer as in the above-described first embodiment. 
     Here, in plan view, the first region  110 D is not disposed at least in a range of the inside of a circle S having a radius L centered on the center  61 D of the magnetic sensor  60 D in this embodiment as illustrated in  FIG. 11 . In other words, in plan view, the second region  120 D is disposed in a range where the inside of the circle S and the case body  100 D overlap each other. More specifically, the second region  120 D is defined by a virtual line extending from the intersection point between the inner edge of the case body  100 D and the circle S in a direction orthogonal to a tangent to the inner edge of the case body  100 D at the intersection point. Note that the range inside the circle S is an example of the predetermined range of the present disclosure. 
     In this manner, the magnetic sensor  60 D and the first region  110 D are disposed at a predetermined distance from each other, and thus, when measuring the geomagnetism using the magnetic sensor  60 D, absorption of the geomagnetism at the ferrite phase of the first region  110 D can be suppressed. In this manner, the measurement accuracy of the geomagnetism at the magnetic sensor  60 D can be improved. 
     Note that in this embodiment, the radius L is set to 15 mm in consideration of the influence of the ferrite phase of the first region  110 D on the measurement of the magnetic sensor  60 D. 
     Advantageous Effects of Fifth Embodiment 
     According to the fifth embodiment, the following effects can be achieved. 
     In this embodiment, in the case body  100 D, the first region  110 D is not disposed at least in a predetermined range from the center  61 D of the magnetic sensor  60 D. Specifically, the first region  110 D is not disposed in a range inside the circle S having a radius of 15 mm centered on the center  61 D of the magnetic sensor  60 D in plan view. 
     In this manner, the measurement accuracy of the geomagnetism at the magnetic sensor  60 D can be improved. 
     MODIFICATION EXAMPLE 
     Note that the present disclosure is not limited to the above-described embodiments, and variations, modifications, and the like may be made within the scope in which the object of the present disclosure can be achieved. 
     In the above-described embodiments, the watch component of the present disclosure is configured as the case bodies  100 ,  100 A,  100 B,  100 C and  100 D, but this is not limitative. For example, the watch component of the present disclosure may be configured as at least one of a case back, a dial, a bezel, a dial ring, and a main plate of a movement. In addition, the electronic watch may include a plurality of the above-described watch components. 
     In the third embodiment, the thickness e of the first non-magnetic layer  112 B provided on the first surface  101  side is greater than the thickness f of the first non-magnetic layer  112 B provided on the second surface  102  side, but this is not limitative. For example, it is possible to adopt a configuration in which the first non-magnetic layer  112 B and the first mixed layer  113 B on the second surface  102  side are not provided. Specifically, it is possible to adopt a configuration in which the first non-magnetic layer  112 B and the first mixed layer  113 B on the second surface  102  side are removed by cutting such that the first soft magnetic layer  111 B is exposed. With such a configuration, a motor and the like can be disposed near the ferrite phase, and thus the magnetic resistance can be further improved. 
     In the above-described embodiments, the antenna  20  is configured as a bar antenna in which the coil winding of the antenna core  21  is formed in a straight-line shape, but this is not limitative. For example, the antenna may be formed in an arc shape. In this case, the axial direction of the antenna is the tangent direction of the end portion of the antenna  20 . 
     In the above-described embodiments, the antenna  20  is configured as a coil antenna, but this is not limitative. For example, the antenna may be configured as a planar antenna or a monopole antenna. 
     In the above-described embodiments, the electronic watch  1  is configured as a radio watch that receives the long-wavelength standard radio wave to adjust the time, but this is not limitative. For example, the electronic watch may be configured as a so-called GPS watch configured to be able to receive radio waves from a GPS satellite. 
     In the above-described embodiments, the case bodies  100 ,  100 A,  100 B,  100 C and  100 D are configured as a watch component, but this is not limitative. For example, it may be configured as a case of an electronic device other than a watch, i.e., a component of an electronic device such as a housing. With a housing having such a configuration, the electronic device can achieve both the improvement in radio wave reception sensitivity and the improvement in magnetic resistance, and can reduce the number of components. 
     Overview of Present Disclosure 
     A watch component of the present disclosure includes a first region including a first soft magnetic layer composed of a ferrite phase, a first non-magnetic layer composed of an austenized phase in which the ferrite phase is austenized, and a first mixed layer in which the ferrite phase and the austenized phase are mixed, the first mixed layer being formed between the first soft magnetic layer and the first non-magnetic layer, and a second region including a second non-magnetic layer composed of the austenized phase, the second non-magnetic layer having a thickness greater than that of the first non-magnetic layer. 
     In this manner, in the second region, the thickness of the second non-magnetic layer composed of the austenized phase capable of transmitting radio waves can be increased, and thus transmission of radio waves such as a long-wavelength standard radio wave can be facilitated. 
     In addition, since the first region includes the first soft magnetic layer composed of the ferrite phase, magnetic resistance can be achieved. That is, with the watch component of the present disclosure, both the improvement in radio wave reception sensitivity and the improvement in magnetic resistance can be achieved with only a single component and the need for a magnetic shield plate and the like can be eliminated, and thus, the number of components can be reduced. 
     In the watch component of the present disclosure, the second region may include a second soft magnetic layer composed of the ferrite phase, and a second mixed layer in which the ferrite phase and the austenized phase are mixed, the second mixed layer being formed between the second soft magnetic layer and the second non-magnetic layer. 
     In this manner, when the second non-magnetic layer is formed by the nitrogen absorption treatment, the entry depth of nitrogen can be reduced, and thus the treatment time of the nitrogen absorption treatment can be reduced. 
     In the watch component of the present disclosure, a thickness of a combination of the second soft magnetic layer and the second mixed layer may be 100 μm or smaller. 
     In this manner, the influence on the reception sensitivity of the antenna housed in the watch component can be reduced, for example. 
     In the watch component of the present disclosure, a thickness of the first soft magnetic layer may be 100 μm or greater. 
     In this manner, in the first region, a predetermined magnetic resistance required as a watch can be achieved. 
     In the watch component of the present disclosure, the first region may include a first surface and a second surface located opposite the first surface, the first non-magnetic layer and the first mixed layer may be provided on a first surface side and a second surface side with respect to the first soft magnetic layer, and a thickness of the first non-magnetic layer formed on the first surface side may be greater than a thickness of the first non-magnetic layer formed on the second surface side. 
     In this manner, the hardness and corrosion resistance required as a watch component can be achieved. Further, the inner space of the watch component can be increased. Thus, the degree of freedom of the arrangement of the components such as the motor and the secondary battery housed in the watch component can be increased, and the size of the watch can be reduced, for example. 
     In the watch component of the present disclosure, a thickness of the first region and a thickness of the second region may be equal to each other. 
     In this manner, the first region and the second region can be simultaneously cut in the manufacturing process of the watch component, and thus the ease of the manufacturing of the watch component can be increased. 
     In the watch component of the present disclosure, a thickness of the first region and a thickness of the second region may be different from each other. 
     In this manner, when the second region is provided in a thickness smaller than that of the first region, attenuation of the radio waves such as the long-wavelength standard radio wave propagating in the second region can be reduced, for example. Thus, the reception sensitivity of the antenna housed in the watch component can be further improved, for example. 
     In the watch component of the present disclosure, the watch component may be at least one of a case body, a case back, a dial, a bezel, a dial ring, and a main plate of a movement. 
     An electronic watch of the present disclosure includes the above-mentioned watch component. 
     The electronic watch of the present disclosure may further include an antenna including an antenna core and a coil wound on the antenna core. In a side view as viewed from an axial direction of the antenna, the second region may be disposed at a position overlapping the antenna. 
     In this manner, the reception sensitivity of the antenna that receives radio waves such as the long-wavelength standard radio wave transmitted through the second region can be increased. 
     In the electronic watch of the present disclosure, in the side view, an area of the second region may be larger than a cross-sectional area of the antenna core. 
     In this manner, the reception sensitivity of the antenna that receives radio waves such as the long-wavelength standard radio wave transmitted through the second region can be increased. 
     The electronic watch component of the present disclosure may further include a magnetic sensor configured to detect geomagnetism. The first region may not be disposed at least in a predetermined range from a center of the magnetic sensor. 
     In this manner, the measurement accuracy of the geomagnetism at the magnetic sensor can be improved. 
     In the electronic watch of the present disclosure, in plan view, the predetermined range may be a range inside a circle centered on the center of the magnetic sensor, the circle having a radius of 15 mm. 
     In this manner, the measurement accuracy of the geomagnetism at the magnetic sensor can be improved.