Abstract:
To provide an speed control mechanism capable of minimizing a reduction in an oscillating angle of a balance with hairspring and a mechanical timepiece having the same. A regulator structure of a speed control mechanism of a mechanical timepiece comprises a nonmagnetic material. Here, the regulator structure typically inc1udes a regulator inc1uding a regulator member, a stud and a hairspring rod, a regulator tail portion, and a finely moving lever. Preferably, among them, at least the regulator and the regulator tail portion comprise a nonmagnetic material. However, at least, a hairspring in the speed control mechanism comprises a magnetic material.

Description:
BACKGROUND OF THE INVENTION  
       [0001]     1. Field of the Invention  
         [0002]     The present invention relates to a speed control mechanism and a mechanical timepiece having the same.  
         [0003]     2. Description of the Prior Art  
         [0004]     In a speed control mechanism of a mechanical timepiece, when a balance with hairspring is constituted by a balance stem and accessories thereof (hairspring, hairspring bead, oscillating seat and the like) and a balance wheel, the speed control mechanism of the mechanical timepiece inc 1 udes a balance with hairspring, a hairspring, a stud structure and a regulator structure. The hairspring in a mode of a spiral spring is fixed to the hairspring bead press-fitted to the balance stem at an inner side end portion in a radius direction thereof, fixed to the stud at an outer side end portion in the radius direction, and an effective length thereof is adjusted by a regulator having a hairspring rod or a hairspring receive brought into contact with the hairspring at a vicinity of the outer side end portion in the radius direction. The balance with hairspring is reciprocally pivoted centering on the balance stem grossly at a period rectified by the effective length of the hairspring under control of an escapement inc 1 uding an escape wheel &amp; pinion and a pallet fork. There is also well known a structure enabling to roughly adjust and finely adjust a position in a peripheral direction at which the hairspring rod or the hairspring receive is brought into contact with the hairspring (for example, JP-A-48-19262). Further, it is also known that a magnitude of an oscillating angle (rotating angle) of the balance wheel effects an influence on the period of reciprocally pivoting the balance with hairspring and effects an influence on a rate of a timepiece.  
         [0005]     Various kinds of improvements have been carried out over many years in order to optimize structures and shapes of respective portions constituting a speed control mechanism and minimize friction or the like of relatively moving portions to minimize loss in reciprocally pivoting a balance with hairspring. The improvements inc 1 ude to form a hairspring by a ferromagnetic material to make a temperature coefficient of Young&#39;s modulus positive in order to cancel thermal expansion of the hairspring by a temperature change of Young&#39;s modulus to minimize a temperature dependency in a reciprocally pivoting period of the balance with hairspring.  
         [0006]     On the other hand, a frequency adjusting structure of a regulator structure and a regulator fine adjustment structure is seen immediately in removing a case back of a timepiece and therefore, in a background art, the frequency adjusting structure is formed by a material whose major component is iron such as carbon steel in order to meet various requests of c 1 early polishing a structure in consideration of an outlook thereof, to make the structure as thin as possible to minimize an increase in a thickness of a movement and necessitating a strength for a material to be able to adjust a pivoting position only when a large force is operated thereto. The material is a (ferro) magnetic material.  
         [0007]     Further, also with regard to a frequency settling structure such as a stud support, there is a case in which the structure is formed by a material whose major component is iron such as carbon steel by reason similar to that of the frequency adjusting structure and the material is a (ferro)magnetic material.  
         [0008]     On the other hand, according to JP-B-44-15925, an escape wheel is covered by a large portion of a plate-like extended portion provided at a pallet fork bridge. A material having a high permeability isused for the pallet fork bridge. Thereby, although the escape wheel cannot be moved by 55 oersted in an ordinary constitution, the escape wheel can be moved up to about 80 oersted.  
         [0009]     The inventors have noticed that there is a possibility that a magnetic field effects an influence on a reciprocating characteristic of a balance with hairspring when the inventors have analyzed a characteristic of oscillation of the balance with hairspring, and when the inventors have carried out a test, to the inventor&#39;s surprise, the inventors have found that magnetization of a regulator structure effects an influence which is difficult to be disregarded on an oscillating angle of the balance with hairspring (experimentally confirmed).  
         [0010]     The invention has been carried out in view of the above-described point and it is an object thereof to provide a speed control mechanism capable of minimizing a reduction in an oscillating angle of a balance with hairspring and a mechanical timepiece having the same.  
       SUMMARY OF THE INVENTION  
       [0011]     A speed control mechanism of the invention inc 1 udes a frequency setting mechanism having a stud attaching structure and a frequency adjusting mechanism having a regulator structure, wherein at least either one of the stud attaching structure and the regulator structure comprises a nonmagnetic material.  
         [0012]     The frequency setting mechanism of the invention inc 1 udes a balance with hairspring, a stud and a stud support structure (also referred to as stud support). The balance with hairspring is constituted by a structure inc 1 uding a balance stem, a balance wheel, an oscillating seat, a hairspring bead and a hairspring. Further, the frequency adjusting mechanism is constituted by a structure comprising only a regulator structure (also referred to as regulator), or the regulator structure and a regulator finely moving structure. The regulator structure is constituted by a structure inc 1 uding a regulator member, a hairspring receive, and a hairspring rod. The regulator finely moving mechanism is constituted by a structure inc 1 uding a finely moving lever and a regulator tail portion.  
         [0013]     The speed control mechanism of the invention comprises a nonmagnetic material and therefore, there is not a concern of magnetizing the speed control mechanism or a portion of the speed control mechanism. Therefore, according to the speed control mechanism of the invention, when integrated to the speed control mechanism, there is not a concern of a reduction in an oscillating angle of the balance with hairspring caused by magnetizing the regulator structure and therefore, the oscillating angle of reciprocally pivoting the balance with hairspring can maximally be maintained. As a result, a concern that operation of the speed control mechanism is influenced by an attitude of an apparatus integrated with the speed control mechanism inc 1 uding the regulator structure (typically, timepiece) or an outer environment is reduced.  
         [0014]     It seems that the oscillating angle of the balance with hairspring is reduced when the speed control mechanism comprises a magnetic material and the speed control mechanism is magnetized because of the following reason. That is, when the speed control mechanism comprising a magnetic material is magnetized under an influence of an outside magnetic field, an eddy current is generated at the balance wheel when the balance wheel comprising a metal material is reciprocally pivoted under a nonuniform magnetic field generated by residual magnetization of the speed control mechanism, a brake force against reciprocal pivoting of the balance wheel is produced and therefore, the oscillating angle of the balance with hairspring is reduced. However, the interpretation with regard to the cause shows one way of view at a current time point, the invention is constituted by formation per se of forming the regulator structure by a nonmagnetic material in order to avoid a reduction (decrease) of the oscillating angle and is not limited to whether the main cause of the reduction in the oscillating angle is derived from generation of the eddy current.  
         [0015]     As a nonmagnetic material, for example, there is used austenitic (for example, 18Ni-8Cr species) stainless steel (for example, SUS304, SUS316 species or the like), titanium or an alloy thereof (for example, Ti-6Al-4V) or the like. However, any other nonmagnetic material will do so far as the material meets requests of a mechanical strength, polishability and the like. For example, the nonmagnetic material may be other kind of metal or alloy as in a copper alloy such as brass.  
         [0016]     A speed control mechanism of the invention achieving the above-described object inc 1 udes a regulator inc 1 uding a regulator member, hairspring receive and a hairspring rod, a regulator tail portion and a finely moving lever and the regulator and regulator tail portion comprise a nonmagnetic material. Although it is preferable that also the finely moving lever for finely adjusting a position of the regulator by way of the regulator tail portion comprises a nonmagnetic material, the finely moving lever is relatively provided with a comparatively small volume and a distance between the finely moving lever and the balance wheel is long and therefore, depending on cases, the finely moving lever may comprise a magnetic material. Further, although it is preferable that the magnetic material is a soft magnetic material such that even when the material is temporarily magnetized, residual magnetization is inconsiderable, an influence thereof is comparatively inconsiderable as described above and therefore, the material may be a hard magnetic material such as carbon steel.  
         [0017]     When the invention is described from a view point of a speed control mechanism, in order to achieve the above-described object, a speed control mechanism of the invention inc 1 udes a frequency setting mechanism having a stud attaching structure and a frequency adjusting mechanism having a regulator structure and a regulator finely adjusting structure, wherein at least any one the stud attaching structure, the regulator structure and the regulator finely adjusting structure comprises a nonmagnetic material.  
         [0018]     According to the speed control mechanism of the invention, the speed control mechanism comprises a nonmagnetic material and therefore, there is not a concern of magnetizing the speed control mechanism or a portion of the speed control mechanism and therefore, even when the timepiece is thinned, there is not a concern of reducing the oscillating angle of reciprocally pivoting the balance wheel by a magnetic field caused by magnetizing the speed control mechanism. That is, when the speed control mechanism comprises a magnetic material, it is necessary to shorten a distance between the regulator structure and the balance wheel in accordance with thin formation of the timepiece, a nonuniform magnetic field generated by the regulator structure at a region of reciprocally pivoting the balance wheel is intensified and there is a higher concern of reducing the oscillating angle of the balance wheel, however, according to the speed control mechanism of the invention, such a problem can be avoided from being brought about.  
         [0019]     In the speed control mechanism of the invention, typically, the balance with hairspring comprises a nonmagnetic conductive material, the stud structure comprises a nonmagnetic material, and the hairspring comprises a magnetic material.  
         [0020]     The balance wheel of the balance with hairspring typically comprises a nonmagnetic metal material such as brass. Further, the balance stem comprises a magnetic metal material such as carbon steel. However, when desired, the material may not be a metal. The stud structure typically inc 1 udes a stud support, a stud and a hairspring setscrew respectively made of a nonmagnetic material.  
         [0021]     On the other hand, the hairspring is formed by a magnetic material, that is, a ferromagnetic material in order to minimize a temperature dependency of a characteristic of oscillating the hairspring by utilizing ΔE effect for making a temperature coefficient of Young&#39;s modulus positive.  
         [0022]     A mechanical timepiece of the invention inc 1 udes the above-described speed control mechanism. 
     
    
     BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS  
       [0023]     A preferred form of the present invention is illustrated in the accompanying drawings in which:  
         [0024]      FIG. 1  is a perspective explanatory view of a speed control mechanism according to a preferable embodiment of the invention;  
         [0025]      FIG. 2  is an explanatory view of a section taken along a line II-II of the speed control mechanism of  FIG. 1 ;  
         [0026]      FIG. 3  is an explanatory view of a section taken along a line III-III of the speed control mechanism of  FIG. 1 ;  
         [0027]      FIG. 4  is a plane explanatory view showing an experimental condition of being exposed to an outside magnetic field; and  
         [0028]      FIG. 5  show experimental results of an influence of a magnetic field for various samples,  FIG. 5A  is a diagram showing a list of a kind of a sample used in the experiment, and  FIG. 5B  is a diagram showing an amount of changing an oscillating angle (difference between the oscillating angle and the oscillating angle before being exposed to a magnetic field) after taking out the various samples from the magnetic field. 
     
    
     DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS  
       [0029]     Next, an explanation will be given of a preferable embodiment of the invention based on a preferable embodiment shown in the attached drawings as follows.  
         [0030]     As shown by  FIG. 1  through  FIG. 3 , a speed control mechanism  1  of a preferable embodiment of the invention inc 1 udes a balance with hairspring  2  and an upper bearing  60  and a lower bearing (not illustrated) thereof, a hairspring  30 , a stud structure  80 , a regulator structure  3 . The balance with hairspring  2  is rotatable in C 1 , C 2  directions around a center axis line C and inc 1 udes a balance stem  10  and a balance wheel  20 .  
         [0031]     According to the balance stem  10 , one end  11  thereof is rotatably supported by a balance lower bearing (not illustrated) mounted to a main plate (not illustrated), and other end portion  12  is rotatably supported by the balance upper bearing  60  in a mode of an aseismatic bearing. Therefore, the balance stem  10  is rotatable in C 1 , C 2  directions around the center axis line C relative to the main plate (not illustrated). The balance upper bearing  60  is fittingly attached to a balance bridge  70  at a balance upper outer frame  61 , and inc 1 udes a balance upper movable hole jewel frame  62 , a balance upper hole jewel  63 , a balance upper receive jewel  64  and a balance upper receive jewel holding spring  65  in this example.  
         [0032]     The balance bridge  70  comprises a thick wall shape member  71  made of a nonmagnetic material such as brass, and positioned and fixed to the main plate  2  by a setscrew  73  fitted to an opening  72  and a positioning guide leg portion (not illustrated). The balance bridge  70  further inc 1 udes a hole  74  to which the upper outer frame  61  of the balance upper bearing  60  is fitted and a projected peripheral wall portion  75  thereof as well as a recess portion  76  and a hole  77  arranged with a finely moving lever, mentioned later.  
         [0033]     The balance wheel  20  made of brass integrally inc 1 udes a rim portion  21  in a circular shape, and a plurality of arm portions  23  extended in a radius direction between the rim portion  21  and a center boss portion  22 , and is fittingly attached to the balance stem  10  at the boss portion  22 .  
         [0034]     The balance stem  10  is further mounted with a hairspring bead  14 , and the hairspring receive  14  is fixed with a radius direction inner side end portion  31  of the hairspring  30  comprising a magnetic material. An oscillating seat  15  comprising a nonmagnetic material such as brass is provided with an oscillating jewel (not illustrated) and is engaged with an escapement (pallet fork and escape wheel &amp; pinion) (not illustrated).  
         [0035]     An outer side end portion  32  of a spiral of the hairspring  30  is attached to a stud structure  80  comprising a nonmagnetic material such as brass by adhering, calking or the like. The stud structure  80  inc 1 udes a stud bridge  81 , a stud  82 , and a stud setscrew  83 . The stud bridge  81  inc 1 udes a ring-like base end portion  84  fitted to an outer periphery of the projected peripheral wall portion  75  of the balance bridge  70 , and a front end side hole portion  85  for receiving to incorporate the stud  82 . The stud  82  locking the outer side end portion  32  of the hairspring  30  is fitted to the hole portion  85  of the stud bridge  81  and is fixed to the stud bridge  81  by the setscrew  83 .  
         [0036]     In the illustrated example, a frequency adjusting mechanism  3  is constituted by a regulator  40  constituting a main body of the mechanism  3 , a regulator tail portion  50 , and a finely moving lever  90 . The regulator  40  and the regulator tail portion  50  also comprise a nonmagnetic material such as brass. The nonmagnetic material may be austenitic (for example, 18Ni-8Cr species) stainless steel (for example, SUS304, SUS316 or the like), titanium or an alloy thereof (for example, Ti-6Al-4V) or the like in place of brass.  
         [0037]     The regulator tail portion  50  is fitted above of the ring-like base end portion  84  of the stud bridge  81  and at an outer periphery of a truncated cone shape large diameter portion  66  of upper outer frame  61  of the balance upper bearing  60  to be relatively pivotably in C 1 , C 2  directions by a ring-like portion  51  having a section substantially in an L-like shape. The regulator tail portion  50  is provided with a tail portion main body portion  52  in a U-like shape extended from the ring-like portion  51  in a radius direction and the U-like tail portion main body portion  52  is engaged with a circular disk shape head portion  91  of the finely moving lever  90 .  
         [0038]     The finely moving lever  90  is provided with a shaft portion  92  fitted to the hole  77  of the balance bridge  70  in D 1 , D 2  directions around a center axis line D, and the head portion  91  is eccentric to the shaft portion  92 . Therefore, when the eccentric head portion  91  of the finely moving lever  90  is pivoted in D 1 , D 2  directions around the center axis line D, the tail portion main body portion  52  is pivoted in C 1 , C 2  directions (or conversely in C 1 , C 2  directions) around the center axis line C by a small amount. Also the finely moving lever  90  preferably comprises a nonmagnetic material such as brass. However, depending on cases, the finely moving lever  90  may comprise a magnetic material.  
         [0039]     A regulator member  41  of the regulator  40  is fitted to above the ring-like base end portion  84  of the stud bridge  81  and an outer periphery of the ring-like portion  51  having the section in the L-like shape of the regulator tail portion  50  relatively pivotably in C 1 , C 2  directions by a ring-like base end portion  42 . Therefore, when the regulator tail portion  50  is pivoted in C 1 , C 2  directions by rotating the finely moving lever  90 , also the regulator  40  inc 1 uding the regulator member  41  is pivoted integrally with the tail portion  50  in C 1 , C 2  directions.  
         [0040]     The regulator member  41  is provided with an arm portion  43  extended from the ring-like portion  42  in a radius direction, a hole portion  43   a  of a middle portion of the arm portion  43  is fittingly attached with a hairspring rod  44  by a base end large diameter portion  44   a , and a hole portion  43   b  on a front end side is fittingly attached with a hairspring receive  45  by a base end small diameter portion  45   a . The hairspring rod  44  is provided with a hairspring rod main body  46  having an axis line E extended in parallel with the axis line C and eccentric to the hole portion  43   a  of the regulator member. When the hairspring rod arm portion  44   a  is pivoted in e 1 , e 2  directions, the hairspring rod main body  46  is pivoted to make a distance between the hairspring rod main body  46  and the hairspring receive  45  variable. In a free stationary state of the balance with hairspring  2 , one portion  33  of an outer peripheral side portion of the hairspring  30  can be adjusted to a position at which the portion is not brought into contact with the hairspring rod main body  46  and the hairspring receive  45 , or can be adjusted to be brought into contact with the hairspring rod main body  46 , or the hairspring receive  45 . Further, in accordance with a rotating angle (oscillating angle) of the balance with hairspring  2 , the hairspring rod main body  46  or the hairspring receive  45  and the hairspring can also be adjusted to switch contact and noncontact states.  
         [0041]     Therefore, when the regulator tail portion  50  is pivoted in C 1 , C 2  directions by rotating the finely moving lever  90  and the regulator  40  is pivoted in C 1 , C 2  directions, also the hairspring rod  44  and the hairspring receive  45  are pivoted in C 1 , C 2  directions, a position of the contact end portion  33  of the hairspring  30  is changed in C 1 , C 2  directions, by changing the effective length of the hairspring  30 , a period of reciprocally pivoting the balance with hairspring  2  is changed and the speed control mechanism  1  controls the speed.  
         [0042]     The larger the oscillating angle of the balance with hairspring  2 , the more stable the operation of the above-described speed control mechanism  1  and when the oscillating angle is reduced, the operation of reciprocating the balance with hairspring  2  is liable to be varied by an attitude of the timepiece  5  having the speed control mechanism  1 , shock (acceleration) received by the timepiece  5  or the like.  
         [0043]     Further, according to the mechanical timepiece  5 , further strictly, the period of reciprocally pivoting the balance with hairspring  2  restricted by the escapement (not illustrated) is slightly changed and the “rate” (an amount (second/day) by which the timepiece  5  gains or loses per day when a state and an environment of the oscillating angle in measuring the rate are maintained) is changed depending not only on a torque (wound up state) of the mainspring but also on the “oscillating angle” of the balance with hairspring  2 . Therefore, there is also a concern that the rate is varied by varying the oscillating angle.  
         [0000]     &lt;Test&gt; 
         [0044]     It is experimentally investigated how the oscillating angle of the balance with hairspring  2  is changed when a magnetic material is used in place of a nonmagnetic material for the regulator member  41 , the regulator tail portion  50  and the finely moving lever  90  of the regulator  40  constituting the regulator structure  3  with regard to the speed control mechanism  1  shown in the above-described embodiment.  
         [0000]     &lt;Sample&gt; 
         [0045]     An experiment of investigating an influence effected on a speed control mechanism by magnetization by preparing the timepiece  5  integrated with various samples shown in  FIG. 5A . In the experiment, 3 pieces of samples are prepared respectively for each sample. Further, as shown by  FIG. 4 , in a state of being integrated to the timepiece  5 , the regulator  40  is extended in parallel with a direction precisely connecting 8 o&#39;c 1 ock and 2 o&#39;c 1 ock in a case  6  of the timepiece  1 .  FIG. 4  shows a state viewing a portion of the speed control mechanism  1  of the timepiece  5  from a side of a back case.  
         [0046]     Sample 5 comprises brass constituting a nonmagnetic material for all of the regulator member  41 , the regulator tail portion  50  and the finely moving lever  90  in addition to the stud bridge  81  and the stud  82 , sample 4 comprises carbon steel which is a ferromagnetic material in place of brass only for the finely moving lever  90 , and sample 2 or sample 3 comprises carbon steel which visa ferromagnetic material in place of brass for the regulator tail portion  50  or the regulator member  41  other than the finely moving lever  90 . On the other hand, sample 1 is of a type used in the background art and comprises carbon steel which is a ferromagnetic material for all of the regulator structure  2  comprising the regulator member  41 , the regulator tail portion  50  and the finely moving lever  90 . Here, sample 5 and sample 4 correspond to the embodiment and samples 1 through 3 are comparative examples. Further, sample 1 is the background art.  
         [0047]     In the above-described, the hairspring rod  44  and the hairspring receive  45  of the regulator  40  are made of brass in any of the cases and therefore, when the regulator member  41  is made of brass (sample 5, sample 4 and sample 2) , a total of the regulator  40  is made of brass.  
         [0000]     &lt;Test condition&gt; 
         [0048]     (1) Each sample previously demagnetized and winding up the hairspring in a fully wound up state is mounted on a test base in an attitude of directing a dial upward, left under a magnetic field of 1600 A/m (200 (Oe)) after gradually strengthen the outer magnetic field and taken out from the magnetic field of at a time point of elapse of one minute.  
         [0049]     (2) According to experiments 1 through 3, directions of applied magnetic fields differ respectively as shown by FIG.  4 . In experiment 1, the magnetic field is applied in a direction directed from 6 o&#39;c 1 ock to 12 o&#39;c 1 ock of the timepiece, in experiment 2, the magnetic field is applied in a direction directed from 8 o&#39;c 1 ock to 2 o&#39;c 1 ock of the timepiece, and in experiment 3, the magnetic field is applied in a direction directed from 7 o&#39;c 1 ock to 1 o&#39;c 1 ock of the timepiece.  
         [0000]     &lt;Measurement&gt; 
         [0050]     (1) Before applying the magnetic field, the “oscillating angle” is measured for each sample. The oscillating angle is measured by Watch Expert II made by Witschi corporation.  
         [0051]     (2) The “oscillating angle” is measured similarly also for each sample taken out from the magnetic field.  
         [0000]     &lt;Experimental Result of Oscillating Angle&gt; 
         [0052]     An amount of a change in the “oscillating angle” is calculated from the “oscillating angle” before applying the magnetic field ((1) of &lt;Measurement&gt;) and the “oscillating angle” after having been exposed in the magnetic field ((2) of &lt;Measurement&gt;). The result is as shown by  FIG. 5B . Further, each numerical result is an average value of a result provided by 3 pieces of samples.  
         [0000]     &lt;Evaluation of Experimental Result&gt; 
         [0053]     (1) As shown by  FIG. 5B , when at least either of the regulator member  41  and the regulator tail portion  50  comprises carbon steel (magnetic material), as is known from results of samples 1 through 3, the oscillating angle of the balance with hairspring after having been taken out to outside of the magnetic field is considerably reduced. This shows that the regulator member  41  and the regulator tail portion  50  magnetized by being arranged in the magnetic field is operated as a resistance for hampering reciprocal pivoting of the balance with hairspring  2 . Although there is more or less direction dependency of the magnetic field, the dependency is not so significant.  
         [0054]     (2) When the oscillating angle is considerably reduced in this way, there is a concern of deteriorating a stability of operation of the balance with hairspring  2  by the attitude of the timepiece  5  and a shock or the like received by the timepiece  5 . Further, depending on cases, there is also a concern of changing the rate.  
         [0055]     (3) It seems that the resistance against the reciprocal pivoting of the balance with hairspring  2  is caused by eddy current produced in the balance wheel  20  reciprocally pivoted in C 1 , C 2  directions under the magnetic field generated by residual magnetization of the regulator member  41  or the regulator tail portion  50 .  
         [0056]     That is, as is known from  FIG. 1  and  FIG. 3 , according to the speed control mechanism  1 , the balance wheel  20  comprising a conductive material (brass) is reciprocally pivoted in C 1 , C 2  directions at a location at which the balance wheel  20  is proximate to the regulator structure  40  which is slender as a whole and therefore, when the essential portion  41  or  50  of the regulator structure  40  is assumedly magnetized, the magnetization generates a nonuniform magnetic field at a region at which the balance wheel  20  is reciprocally pivoted, and the balance wheel  20  is reciprocally pivoted in the magnetic field. Therefore, an eddy current is generated in the balance wheel  20  and the eddy current exerts a brake force to the reciprocal pivoting of the balance wheel  20  under the magnetic field. However, the invention is not limited by the interpretation.  
         [0057]     (4) On the other hand, as is known by  FIG. 5B , with regard to sample 5 in which all the portions  40 ,  50 ,  90  of the regulator structure  3  comprise the nonmagnetic material (brass), the oscillating angle is hardly changed. Further, in the case of sample 4 in which only the finely moving lever  90  comprises the magnetic material (carbon steel) and the other portions comprise the nonmagnetic material (brass), although there is a slight influence of the magnetic field, the influence is comparatively small. Therefore, it is known that it is preferable to form a total of the regulator structure  3  by the nonmagnetic material in order to maintain the oscillating angle of the balance with hairspring  2  of the speed control mechanism  1  to be large and maintaining the speed control mechanism  1  stably against an outside disturbance. However, the finely moving lever  90  may be constituted by the magnetic material.  
         [0058]     (5) When the speed control mechanism  1  is thinned with an object of thin formation of the timepiece  5  or the like, a distance between the regulator member  41  or the regulator tail portion  50  and the balance wheel  20  is necessarily reduced and therefore, the magnetic field which is produced by the regulator  41  or the regulator tail portion  50  at a location of the balance wheel  20  is increased and there is a concern that the above-described influence becomes more significant. Therefore, it seems that the significance of forming a substantial portion of the total of the regulator structure  3  by the nonmagnetic material is considerable.  
         [0059]     (6) Further, in the above-described, for example, even in the case (sample 5) in which the total of the regulator structure  3  is formed by the nonmagnetic material, since the hairspring  30  is produced by a magnetic material, for example, there is a possibility that the residual magnetization of the hairspring  30  effects an influence on contracting and enlarging operation of the spiral of the hairspring  30  related to the reciprocal pivoting of the balance with hairspring  2  and effects an influence on a change in the oscillating angle of the balance with the hairspring  2 .