Electronically controlled mechanical clock

Abstract

To provide an electronic control type mechanical watch that can reduce the leakage magnetic flux leaking from a rotor magnet to a magnetic body part of a bottom board and can prevent loss of eddy current on the bottom board.SOLUTION: An electronic control type mechanical watch comprises: a rotor that includes a rotation shaft, a pinion that is provided on the rotation shaft and to which torque from a spiral spring is transmitted, and a rotor magnet that is attached to the rotation shaft, and rotates by the torque; a power generator that has a coil and a stator and generates power through the rotation of the rotor; and a bottom board that is formed including material of a magnetic body, has a facing surface facing the stator, and supports the rotation shaft of the rotor. In a cross-sectional view seen from a direction perpendicular to an axial direction of the rotation shaft, the center of the stator along the axial direction is arranged closer to the facing surface than the center of the rotor magnet along the axial direction.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to an electronically controlled mechanical timepiece. [Background technology]

[0002] Patent Document 1 discloses an electronically controlled mechanical timepiece in which the mechanical energy output when the mainspring unwinds is converted into electrical energy by a generator, and that electrical energy is used to operate a rotation control means to control the rotation of the rotor, thereby accurately moving the hands fixed to the train wheel.

[0003] In Patent Document 1, the magnetic part of the ground plate is positioned away from the rotor magnet of the rotor, thereby reducing leakage magnetic flux from the rotor magnet to the magnetic part of the ground plate, thereby suppressing eddy current loss in the ground plate. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 11-281760 Summary of the Invention [Problem to be solved by the invention]

[0005] As described in Patent Document 1, if part of the magnetic flux generated by the rotor magnet becomes leakage flux and interlinks with the magnetic part of the base plate, eddy current loss occurs in the base plate, increasing the torque required to rotate the rotor, consuming spring energy and shortening the duration. For this reason, there is a demand to further reduce the influence of a base plate made of a magnetic material. [Means for solving the problem]

[0006] The electronically controlled mechanical timepiece disclosed herein comprises a rotating shaft, a pinion provided on the rotating shaft to which torque from a mainspring is transmitted, and a rotor magnet attached to the rotating shaft, a rotor that rotates with the torque, a generator having a coil and a stator and generating electricity through the rotation of the rotor, and a base plate formed from a magnetic material, having an opposing surface facing the stator, and supporting the rotating shaft of the rotor, characterized in that in a cross-sectional view taken from a direction perpendicular to the axial direction of the rotating shaft, the center of the stator along the axial direction is located closer to the opposing surface than the center of the rotor magnet along the axial direction.

[0007] The electronically controlled mechanical timepiece disclosed herein comprises a dial having a front and back surface, a main plate arranged on the back side of the dial and formed containing a magnetic material, a rotating shaft having tenons on both ends, a pinion provided on the rotating shaft to which torque from a mainspring is transmitted, and a rotor magnet attached to the rotating shaft, a rotor arranged on the opposite side of the main plate from the dial and rotates by the torque, a frame body fixed to the main plate and formed using a non-magnetic material, a hole jewel fixed to the frame body and through which one tenon of the rotating shaft is inserted, a jewel arranged inside the frame body, and a pressure spring that presses the jewel, and a bearing that supports the one tenon, characterized in that, when viewed in a cross-section perpendicular to the axial direction of the rotating shaft, the frame body is fixed to the main plate at a position closer to the dial than the hole jewel with respect to the rotor magnet. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing an electronically controlled mechanical timepiece according to a first embodiment. [Figure 2] FIG. 2 is a plan view showing the main parts of the movement of the first embodiment. [Figure 3] FIG. 2 is a cross-sectional view showing the main part of the movement of the first embodiment. [Figure 4] FIG. 2 is an enlarged cross-sectional view showing the main part of the movement of the first embodiment. [Figure 5]FIG. 10 is a diagram showing the relationship between the overlap ratio of the rotor magnet and the stator and the magnetic flux density. [Figure 6] FIG. 10 is a cross-sectional view showing the main part of a movement according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] [First embodiment] An electronically controlled mechanical timepiece 1 according to a first embodiment of the present disclosure will be described below with reference to the drawings. In the description of this embodiment, a plan view refers to a state seen from the axial direction of a rotation shaft 82 of a rotor 81, which will be described later. A cross-sectional view refers to a state seen from a direction perpendicular to the axial direction of a rotation shaft 82 of a rotor 81, which will be described later. Figure 1 is a front view of an electronically controlled mechanical timepiece 1. The electronically controlled mechanical timepiece 1 is a wristwatch worn on the user's wrist, and is equipped with a cylindrical exterior case 2, with a dial 3 located on the inner periphery of the exterior case 2.

[0010] The electronically controlled mechanical timepiece 1 is equipped with a movement 10 shown in Figures 2 and 3 housed in an exterior case 2, and an hour hand 4A, minute hand 4B, and second hand 4C that indicate time information as shown in Figure 1. The dial 3 is provided with a small calendar window 3A, through which the date wheel 6 can be seen. The dial 3 is a plate-shaped member with a front and back surface, the front surface being the surface visible to the user. Hour marks 3B for indicating the time are displayed on the front side of the dial 3.

[0011] A crown 7 is provided on the side of the exterior case 2. The crown 7 can be moved from a 0 position where it is pushed toward the center of the electronically controlled mechanical timepiece 1 to a 1 position or a 2 position by being pulled out. When the crown 7 is rotated to the 0 position, the first mainspring 20 and the second mainspring 30 provided in the movement 10 can be wound. When the first mainspring and the second mainspring are fully wound, the electronically controlled mechanical watch 1 can ensure a running time of approximately 120 hours. When the crown 7 is pulled out to the first position and rotated, the date wheel 6 moves and the date can be set. When the crown 7 is pulled out to the second position, the second hand 4C stops, and when the crown 7 is rotated in the second position, the hour hand 4A and minute hand 4B move and the time can be set. The method of adjusting the date wheel 6, hour hand 4A and minute hand 4B using the crown 7 is the same as that of conventional mechanical watches, so a description will be omitted.

[0012] [Movement] FIG. 2 is a plan view showing the main parts of the movement 10 of this embodiment, and FIG. 3 is a cross-sectional view showing the main parts of the movement 10. As shown in FIG. 2 and 3, the movement 10 includes a first barrel 21 that houses a first mainspring 20 and a second barrel 31 that houses a second mainspring 30. The hour hand 4A, minute hand 4B, and second hand 4C are driven by the first mainspring 20 and second mainspring 30 of the movement 10. The first mainspring 20 and second mainspring 30 are examples of the mainsprings of the present disclosure.

[0013] The movement 10 includes a main plate 11 disposed on the back side of the dial 3, and a train wheel bridge 14. Between the main plate 11 and the train wheel bridge 14 are disposed a first barrel complete 21, a second barrel complete 31, a manual winding mechanism 40 that winds the first mainspring 20 and the second mainspring 30, and an automatic winding mechanism 50. Also disposed between the main plate 11 and the train wheel bridge 14 are an indicator train wheel 90 that transmits the torque of the first mainspring 20 and the second mainspring 30, and a generator 80 that is driven by the torque transmitted via the indicator train wheel 90.

[0014] In this embodiment, the base plate 11 is made of a non-magnetic material such as brass or synthetic resin, and the surface of the base plate is subjected to a surface treatment using a magnetic material such as nickel plating for the purpose of rust prevention and improving appearance. That is, in this embodiment, the base plate 11 is made of a magnetic material. In this embodiment, the base plate 11 has an opposing surface 12 that faces stators 881 and 891, which will be described later. Furthermore, a circuit insulating plate 15 is arranged on the opposing surface 12 of the base plate 11 on the side of the stators 881 and 891. The base plate 11 is not limited to the above configuration, and may be formed, for example, using a magnetic material as the base material.

[0015] [First mainspring and first barrel] The first mainspring 20 is housed in a first barrel complete 21. The first barrel complete 21 includes a first barrel 22 and a first barrel arbor 23. A first ratchet wheel 24 that rotates integrally with the first barrel arbor 23 is attached to the first barrel arbor 23.

[0016] [Manual winding mechanism] The manual winding mechanism 40 includes a winding stem 41 to which the crown 7 is attached, a clutch wheel 42, a timing pinion 43, a crown wheel 44, a square-hole first transmission wheel 45, a square-hole second transmission wheel 46, and a square-hole third transmission wheel 47. The square-hole third transmission wheel 47 meshes with the first square-hole wheel 24. Therefore, when the user rotates the crown 7 at the 0-position, the winding stem 41 and the clutch wheel 42 rotate. When the crown 7 is at the 0-position, the clutch wheel 42 meshes with the timing wheel 43, and the rotation of the clutch wheel 42 is transmitted in sequence from the timing wheel 43 to the crown wheel 44, the first square-bore transmission wheel 45, the second square-bore transmission wheel 46, and the third square-bore transmission wheel 47. As a result, the first square-bore wheel 24 and the first barrel stem 23 rotate, and the first mainspring is wound up.

[0017] [Automatic winding mechanism] The automatic winding mechanism 50 includes an oscillating weight 51, an eccentric wheel 53, a pawl lever 54, and a transmission wheel 55. The eccentric wheel 53 includes an eccentric gear 531 and an eccentric shaft member 532, and rotates in both forward and reverse directions in conjunction with the rotary weight 51. The pawl lever 54 is attached to the eccentric shaft portion of the eccentric shaft member 532 of the eccentric wheel 53 so as to be rotatable. When the eccentric wheel 53 rotates in conjunction with the oscillating weight 51, the pawl lever 54 attached to the eccentric wheel 53 moves back and forth toward and away from the transmission wheel 55, rotating the transmission wheel 55 in one direction.

[0018] The transmission wheel 55 has a gear that meshes with the first ratchet wheel 24, and when it rotates in one direction in conjunction with the forward and backward movement of the pawl lever 54, it rotates the first ratchet wheel 24. When the first ratchet wheel 24 rotates, the first barrel arbor 23 rotates integrally with the first ratchet wheel 24, and the first mainspring 20 is wound up. Therefore, the electronically controlled mechanical timepiece 1 of this embodiment can wind the first mainspring 20 both manually by operating the crown 7 and automatically by rotating the oscillating weight 51.

[0019] [Second mainspring and second barrel] The second mainspring 30 is housed in a second barrel complete 31. The second barrel complete 31 is equipped with a second barrel 32. The second mainspring 30 is wound by the first mainspring 20. That is, when the first mainspring 20 is wound and torque sufficient to wind the second mainspring 30 is accumulated, the first barrel 22 of the first barrel complete 21 rotates. The first barrel 22 is engaged with the second ratchet wheel 34 via the barrel intermediate wheel 27, and when the first barrel 22 rotates, the second ratchet wheel 34 and the second barrel arbor rotate, and the second mainspring is wound up.

[0020] Therefore, in the electronically controlled mechanical timepiece 1 of this embodiment, the first mainspring 20 and the second mainspring 30 can be wound by either the manual winding mechanism 40 or the automatic winding mechanism 50. Note that the electronically controlled mechanical timepiece 1 may be provided with only one of the manual winding mechanism 40 or the automatic winding mechanism 50.

[0021] [Generator] The generator 80 is configured to include a rotor 81 and coil blocks 88 and 89 . Coil block 88 is configured by winding a coil 882 around a stator 881, and coil block 89 is configured by winding a coil 892 around a stator 891. As described above, the stators 881 and 891 are disposed opposite the opposing surface 12 of the main plate 11 . In this embodiment, when the rotor 81 of the generator 80 is rotated by an external torque, induced electromotive force is generated by the coil blocks 88 and 89, and electrical energy is output and supplied to a capacitor, etc. Also, by shorting the coils 882 and 892, a brake can be applied to the rotor 81, and by controlling the braking force, the rotational period of the rotor 81 can be adjusted to a constant speed. In this way, the electronically controlled mechanical timepiece 1 of this embodiment is equipped with a generator 80 that generates induced power and outputs electrical energy.

[0022] Rotor 81 includes a rotating shaft 82, a rotor pinion 83, a rotor magnet 84, a rotor inertia plate 85, and a stopper 86. Rotor magnet 84, rotor inertia plate 85, and stopper 86 are each attached to rotating shaft 82. Rotor inertia plate 85 is a component that reduces fluctuations in the rotation speed of rotor 81 in response to fluctuations in the drive torque from second barrel 32.

[0023] A first tenon 821 is formed at the end of the rotating shaft 82 facing the main plate 11, and a second tenon 822 is formed at the end facing the train wheel bridge 14. A rotor pinion 83, to which torque from the mainspring is transmitted, is formed integrally with the rotating shaft 82. The rotating shaft 82 also includes a large-diameter flange 823 and a small-diameter shaft portion 824 formed continuously from the flange 823, with the first tenon 821 provided at the tip of the shaft portion 824. The tip of the shaft portion 824 is formed in a tapered shape that gradually reduces in diameter and is continuous with the first tenon 821. The continuous portion of the first tenon 821 and the shaft portion 824 is curved, preventing the first tenon 821 from breaking at its base even when a radial force is applied to the rotor 81.

[0024] An end face 825 of the rotating shaft 82 on the train wheel bridge 14 side has a larger diameter than the second tenon 822. In addition, the base portion of the second tenon 822 that is continuous with the end face 825 is curved, which prevents the second tenon 822 from breaking at the base even when a radial force is applied to the rotor 81.

[0025] The rotor magnet 84 is formed in a cylindrical shape, with the surface facing the main plate 11 being a first surface 841 and the surface facing the train wheel bridge 14 being a second surface 842. The shaft portion 824 is inserted into the rotor magnet 84, and the second surface 842 abuts against the flange 823.

[0026] The stopper 86 is formed in a substantially cylindrical shape and is press-fitted and fixed onto the shaft portion 824. As a result, the rotor magnet 84 is sandwiched and fixed between the flange 823 and the stopper 86. Therefore, the stopper 86 also serves as a magnet fixing seat that fixes the rotor magnet 84.

[0027] [Display gear train] Next, the display train wheel 90 that drives the hour hand 4A, minute hand 4B, and second hand 4C using mechanical energy from the first mainspring 20 and second mainspring 30 will be described. The display wheel train 90 includes a center wheel, a third wheel 93, a fourth wheel 94, a fifth wheel 95, and a sixth wheel 96 (not shown). After the rotation of the second barrel 32 is transmitted to the center wheel, the rotation speed is increased successively through the third wheel 93, the fourth wheel 94, the fifth wheel 95, and the sixth wheel 96, and then transmitted to the rotor 81. Therefore, the rotor 81 rotates with the torque transmitted from the first mainspring 20 and the second mainspring 30.

[0028] A minute hand 4B is fixed to the center wheel 94 via a cannon pinion (not shown), and a second hand 4C is fixed to the fourth wheel 94 via a second hand shaft 941. In addition, an hour wheel (not shown) is connected to the cannon pinion, and an hour hand 4A is fixed to this hour wheel.

[0029] In the above electronically controlled mechanical clock 1, the AC output from the generator 80 is boosted and rectified through a rectifier circuit consisting of a boost rectifier, full-wave rectifier, half-wave rectifier, transistor rectifier, etc., before being charged into a smoothing capacitor, and the power from this capacitor operates a rotation control device (not shown) that controls the rotation period of the generator 80. The rotation control device is composed of an integrated circuit including an oscillation circuit, a frequency divider circuit, a rotation detection circuit, a rotation speed comparison circuit, electromagnetic brake control means, etc., and a quartz oscillator is used in the oscillation circuit.

[0030] [Rotor bearing] The bearings that support the rotor 81 include a first bearing 100 attached to the main plate 11 and a second bearing 200 attached to the train wheel bridge 14. The rotating shaft 82 of the rotor 81 is supported by the main plate 11 and the train wheel bridge 14 via the first bearing 100 and the second bearing 200.

[0031] [First bearing] The first bearing 100 comprises a frame body 110 fixed to the base plate 11, a hole stone 120 fixed to the frame body 110, a receiving stone 130 arranged within the frame body 110, and a pressing spring 140 that presses down on the receiving stone 130.

[0032] The frame 110 is made of a non-magnetic material such as a non-magnetic metal or synthetic resin, and includes a disk-shaped holding portion 111 and a ring-shaped positioning portion 112 that is continuous with the outer periphery of the holding portion 111 . The hole stone 120 is made of, for example, ruby, and has a first tenon 821 of the rotation shaft 82 inserted through its center. The hole stone 120 is press-fitted and fixed into the frame 110, and rotatably supports the first tenon 821 of the rotation shaft 82.

[0033] The jewel 130 is a generally disc-shaped component made of, for example, ruby, and is disposed in the holder 111 of the frame 110. The pressing spring 140 is configured by a plate spring member made of, for example, metal, and its outer peripheral end is held by the holding portion 111 of the frame body 110, and urges the jewel 130 toward the rotary shaft 82 side.

[0034] [Second bearing] The second bearing 200 includes a frame 210, a hole jewel 220, a bearing jewel 230, and a pressure spring 240. The frame 210 has a configuration similar to that of the holding portion 111 of the frame 110 , and is fixed to the train wheel bridge 14 . The holed stone 220, the receiving stone 230, and the pressure spring 240 are the same parts as the holed stone 120, the receiving stone 130, and the pressure spring 140, and therefore their explanation will be omitted.

[0035] [Regarding the arrangement of the stator and rotor magnets] Next, the arrangement of the stators 881, 891 and the rotor magnet 84 will be described. FIG. 4 is an enlarged cross-sectional view showing the main part of the movement 10. 4, in this embodiment, the stators 881, 891 are arranged so that the center line P extending in a direction perpendicular to the axial direction of the rotating shaft 82 in a cross-sectional view, that is, the center line P passing through the dimensional center of the stators 881, 891 along the axial direction of the rotating shaft 82, is located closer to the opposing surface 12 of the main plate 11 than the center line O of the rotor magnet 84, that is, the center line O passing through the dimensional center of the rotor magnet 84 along the axial direction of the rotating shaft 82. In other words, in this embodiment, the rotor magnet 84 is arranged so that the center line O extending in a direction perpendicular to the rotating shaft 82 is located closer to the train wheel bridge 14 than the center line P of the stators 881, 891. As a result, in this embodiment, the rotor magnet 84 can be positioned at a greater distance from the base plate 11 compared to when the rotor magnet 84 is positioned so that the center line O of the rotor magnet 84 coincides with the center line P of the stators 881, 891 in a cross-sectional view. This reduces leakage flux from the rotor magnet 84 to the magnetic material portion of the base plate 11, and suppresses eddy current loss in the base plate 11.

[0036] In this embodiment, the rotor magnet 84 is disposed so as to partially overlap the stators 881 and 891 in the height direction, i.e., in the axial direction of the rotating shaft 82. That is, the rotor magnet 84 and the stators 881 and 891 are disposed so as to at least partially overlap in a cross-sectional view. Furthermore, the rotor magnet 84 is disposed so that a first surface 841, which is the surface facing the main plate 11, is located closer to the train wheel bridge 14 than the center line P of the stators 881 and 891. That is, the stators 881 and 891 are disposed so that the center line P is located closer to the opposing surface 12 of the main plate 11 than the first surface 841 of the rotor magnet 84. In other words, the stators 881 and 891 and the rotor magnet 84 are disposed so that the dimension from the center line O along the axial direction of the rotating shaft 82 to the opposing surface 12 is greater than the dimension from the center line P along the axial direction of the rotating shaft 82 to the opposing surface 12. More specifically, the rotor magnet 84 and the stators 881, 891 are arranged so that, in a cross-sectional view, dimension T2 of the portion where the rotor magnet 84 and the stators 881, 891 overlap in the height direction is 50% or more of dimension T1 in the height direction of the rotor magnet 84. In other words, the rotor magnet 84 and the stators 881, 891 overlap by 50% or more of the dimension in the height direction of the rotor magnet 84. In other words, the rotor magnet 84 is arranged so that the center line O of the rotor magnet 84 is located closer to the main plate 11 than the surfaces of the stators 881, 891 on the train wheel bridge 14 side.

[0037] Fig. 5 is a diagram showing the relationship between the overlap ratio of rotor magnet 84 and stators 881, 891 and the magnetic flux density at stators 881, 891. In Fig. 5, the horizontal axis shows the overlap ratio of rotor magnet 84 and stators 881, 891 with respect to the height dimension of rotor magnet 84, the vertical axis on the left shows the magnetic flux density at stators 881, 891, and the vertical axis on the right shows the ratio of magnetic flux density when the magnetic flux density at an overlap ratio of 100% is set to 100. As shown in Figure 5, when the overlap ratio between the rotor magnet 84 and the stators 881, 891 is 50%, that is, when the rotor magnet 84 and the stators 881, 891 are arranged so that T2 in Figure 4 is half of T1, the magnetic flux density in the stators 881, 891 is approximately 0.158 Tesla. This is approximately 97% of the magnetic flux density when the overlap ratio between the rotor magnet 84 and the stators 881, 891 is 100%. This suggests that if the overlap ratio between the rotor magnet 84 and the stators 881, 891 is 50% or more, the magnetic flux density in the stators 881, 891 is hardly affected. Therefore, in this embodiment, even if a portion of the rotor magnet 84 is positioned so as not to overlap with the stators 881, 891 in a cross-sectional view, the rotor magnet 84 and the stators 881, 891 are positioned so as to overlap by 50% or more of the height dimension of the rotor magnet 84, so there is almost no effect on the magnetic flux density in the stators 881, 891 and there is almost no effect on power generation in the generator 80. Note that the present invention is not limited to the above configuration, and for example, rotor magnet 84 and stators 881, 891 may be arranged so that, in a cross-sectional view, dimension T2 of the portion where rotor magnet 84 and stators 881, 891 overlap in the height direction is 35% or more of dimension T1 in the height direction of rotor magnet 84. With this configuration, a magnetic flux density of approximately 95% of the magnetic flux density when the overlap ratio of rotor magnet 84 and stators 881, 891 is 100% can be ensured, so there is almost no effect on the magnetic flux density in stators 881, 891, and there is almost no effect on power generation by generator 80.

[0038] [Effects of the first embodiment] In this embodiment, the following effects can be obtained. In this embodiment, in a cross-sectional view taken from a direction perpendicular to the axial direction of rotation shaft 82 of rotor 81, center line P of stators 881, 891 is positioned closer to opposing surface 12 of main plate 11 than center line O of rotor magnet 84, so main plate 11, which is formed including a magnetic material, and rotor magnet 84 can be positioned apart. This reduces leakage magnetic flux leaking from rotor magnet 84 to the magnetic material portion of main plate 11, and suppresses eddy current loss in main plate 11. This allows the duration of first mainspring 20 and second mainspring 30 to be extended.

[0039] In this embodiment, the rotor magnet 84 and the stators 881, 891 are positioned so that they at least partially overlap in a cross-sectional view, and the center lines P of the stators 881, 891 are positioned closer to the opposing surface 12 than the first surface 841, which is the surface of the rotor magnet 84 that faces the main plate 11. This makes it possible to position the rotor magnet 84 away from the main plate 11 while suppressing the effect on the magnetic flux density of the stators 881, 891. Furthermore, because the stators 881, 891 can be positioned closer to the main plate 11, the electronically controlled mechanical timepiece 1 can be made thinner.

[0040] In this embodiment, when viewed in cross section, the rotor magnet 84 and the stators 881, 891 overlap by 35% or more of the height dimension of the rotor magnet 84, so the rotor magnet 84 can be positioned away from the base plate 11 with little effect on the magnetic flux density in the stators 881, 891. In this embodiment, in cross-sectional view, the rotor magnet 84 and the stators 881, 891 overlap by more than 50% of the height dimension of the rotor magnet 84, so that the rotor magnet 84 can be positioned away from the base plate 11 without further affecting the magnetic flux density in the stators 881, 891.

[0041] [Second embodiment] Next, an electronically controlled mechanical timepiece according to a second embodiment of the present disclosure will be described with reference to Fig. 6. In the second embodiment, the same or similar components as those in the first embodiment will be given the same reference numerals, and descriptions thereof will be omitted or simplified. FIG. 6 is a cross-sectional view showing the main part of a movement 10A of an electronically controlled mechanical timepiece according to the second embodiment. As shown in FIG. 6, the movement 10A of the second embodiment includes a main plate 11A arranged on the back side of the dial 3, and a train wheel bridge 14, similar to the movement 10 of the first embodiment described above. Furthermore, the movement 10A has a rotor 81, stators 881 and 891, coils 882 and 892, a first bearing 100A, and a second bearing 200. In this embodiment, as in the first embodiment described above, the stators 881, 891 and the rotor magnet 84 are arranged so that the center lines of the stators 881, 891 are positioned closer to the opposing surface 12A of the base plate 11A than the center line of the rotor magnet 84.

[0042] [First bearing] In this embodiment, the first bearing 100A comprises a frame body 110A fixed to the base plate 11A, a hole stone 120 fixed to the frame body 110A, a receiving stone 130 arranged within the frame body 110A, and a pressure spring 140 that presses down on the receiving stone 130. Frame 110A is formed using a non-magnetic material such as a non-magnetic metal or synthetic resin, and has a disk-shaped retaining portion 111A, a ring-shaped positioning portion 112A that is continuous with the outer periphery of retaining portion 111A, and an extending portion 113A that extends toward dial 3 beyond jewel 130. Specifically, extending portion 113A extends in a ring shape toward dial 3 on the outer periphery of retaining portion 111A. In other words, extending portion 113A is located on the opposite side of positioning portion 112A on the outer periphery of retaining portion 111A.

[0043] In this embodiment, the main plate 11A has a fixing portion 13A that fixes the extension portion 113A of the frame body 110A. This allows the main plate 11A to fix the frame body 110A at a position on the dial 3 side. Therefore, the fixing portion 13A of the frame body 110A on the main plate 11A and the rotor magnet 84 can be arranged apart from each other.

[0044] Furthermore, in this embodiment, the base plate 11A has an opening S formed in a position on the rotor magnet 84 side of the fixed portion 13A. Specifically, the opening S has a diameter larger than that of the opening constituting the fixed portion 13A that fixes the frame body 110A. This prevents the base plate 11A and the rotor magnet 84 from being disposed too close to each other at the position on the rotor magnet 84 side of the fixed portion 13A. That is, as shown in FIG. 6, the shortest distance L2 between the rotor magnet 84 and the base plate 11A when the opening S is provided can be made larger than the shortest distance L1 between the rotor magnet 84 and the base plate 11A when the opening S is not provided. This allows the base plate 11A and the rotor magnet 84 to be disposed farther apart.

[0045] [Effects of the second embodiment] In this embodiment, the following effects can be obtained. In this embodiment, in a cross-sectional view taken from a direction perpendicular to the axial direction of the rotation shaft 82 of the rotor 81, the frame 110A is fixed to the main plate 11A at a position closer to the dial 3 than the hole jewel 120 is to the rotor magnet 84. This allows the main plate 11A for fixing the frame 110A to be positioned closer to the dial 3, so the main plate 11A, which is formed including a magnetic material, and the rotor magnet 84 can be positioned apart. This reduces leakage magnetic flux from the rotor magnet 84 to the magnetic material portion of the main plate 11A, and suppresses eddy current loss in the main plate 11A.

[0046] In this embodiment, the main plate 11A fixes the extension portion 113A that extends further toward the dial 3 than the jewel 130, so the fixing point of the frame body 110A by the main plate 11A can be positioned closer to the dial 3. This allows the rotor magnet 84 and the main plate 11A to be positioned farther apart. Furthermore, compared to when the extension portion 113A is not provided, the contact surface between the frame body 110A and the main plate 11A can be made larger, so the frame body 110A can be reliably fixed by the main plate 11A.

[0047] In this embodiment, an opening S is formed in the base plate 11A on the rotor magnet 84 side of the fixed part 13A, which prevents the base plate 11A and the rotor magnet 84 from being disposed too close to each other at the position on the rotor magnet 84 side of the fixed part 13A. This allows the base plate 11A and the rotor magnet 84 to be disposed farther apart.

[0048] [Variations] The present disclosure is not limited to the above-described embodiments, and includes modifications, improvements, etc. within the scope of achieving the object of the present disclosure.

[0049] In each of the above embodiments, the electronically controlled mechanical timepiece 1 is configured with two springs, the first spring 20 and the second spring 30, but this is not limited to this and, for example, it may be configured with only one spring.

[0050] In the first embodiment, the center lines P of the stators 881, 891 are located closer to the opposing surface 12 than the first surface 841, which is the surface of the rotor magnet 84 that faces the main plate 11, in a cross-sectional view, but this is not limiting. For example, the stator and rotor magnet may be located so that the center line of the stator is located closer to the train wheel receiver than the surface of the rotor magnet that faces the main plate, or the stator and rotor magnet may be located so that the center line of the stator is located closer to the opposing surface of the main plate than the center line of the rotor magnet.

[0051] In the second embodiment, the stators 881, 891 and the rotor magnet 84 are arranged so that the center lines of the stators 881, 891 are located closer to the opposing surface 12A of the main plate 11A than the center line of the rotor magnet 84, but this is not limiting. For example, the stator and the rotor magnet may be arranged so that the center line of the stator coincides with the center line of the rotor magnet in a cross-sectional view, as long as the frame 110 is fixed to the main plate at a position closer to the dial than the pins relative to the rotor magnet.

[0052] Summary of this disclosure The electronically controlled mechanical timepiece disclosed herein comprises a rotating shaft, a pinion provided on the rotating shaft to which torque from a mainspring is transmitted, and a rotor magnet attached to the rotating shaft, a rotor that rotates with the torque, a generator having a coil and a stator and generating electricity through the rotation of the rotor, and a base plate formed from a magnetic material, having an opposing surface facing the stator, and supporting the rotating shaft of the rotor, characterized in that in a cross-sectional view taken from a direction perpendicular to the axial direction of the rotating shaft, the center of the stator along the axial direction is located closer to the opposing surface than the center of the rotor magnet along the axial direction. In the present disclosure, in a cross-sectional view taken from a direction perpendicular to the axial direction of the rotor's rotation axis, the center of the stator along the axial direction is positioned closer to the opposing surface than the center of the rotor magnet along the axial direction, so the base plate formed with a magnetic material can be positioned apart from the rotor magnet, thereby reducing leakage flux from the rotor magnet to the magnetic material part of the base plate and suppressing eddy current loss in the base plate.

[0053] In the electronically controlled mechanical timepiece of the present disclosure, the rotor magnet and the stator may be positioned so that they at least partially overlap when viewed in cross section, and the center of the stator may be positioned closer to the opposing surface than the surface of the rotor magnet facing the base plate. This allows the rotor magnet to be positioned away from the ground plane while suppressing the effect on the magnetic flux density in the stator.

[0054] In the electronically controlled mechanical timepiece of the present disclosure, it is preferable that, in the cross-sectional view, the rotor magnet and the stator have an overlap of 35% or more of the height dimension of the rotor magnet. In the electronically controlled mechanical timepiece of the present disclosure, it is preferable that, in the cross-sectional view, the rotor magnet and the stator have an overlap of 50% or more of the height dimension of the rotor magnet. This allows the rotor magnets to be placed away from the ground plane with little effect on the magnetic flux density in the stator.

[0055] The electronically controlled mechanical timepiece disclosed herein comprises a dial having a front and a back, a main plate arranged on the back side of the dial and formed containing a magnetic material, a rotating shaft having tenons on both ends, a pinion provided on the rotating shaft to transmit torque from a mainspring, and a rotor magnet attached to the rotating shaft, a rotor arranged on the opposite side of the main plate from the dial and rotated by the torque, a frame body fixed to the main plate and formed using a non-magnetic material, a hole jewel fixed to the frame body and through which one tenon of the rotating shaft is inserted, a jewel arranged inside the frame body, and a pressure spring that presses the jewel, and a bearing that supports the one tenon, characterized in that, when viewed in a cross-section perpendicular to the axial direction of the rotating shaft, the frame body is fixed to the main plate at a position closer to the dial than the hole jewel with respect to the rotor magnet. In this disclosure, in a cross-sectional view taken from a direction perpendicular to the axial direction of the rotor's rotation shaft, the frame is fixed to the base plate at a position closer to the dial than the pinholes relative to the rotor magnet. This allows the base plate for fixing the frame to be positioned closer to the dial, so the base plate, which is formed by including a magnetic material, can be positioned farther apart from the rotor magnet. This reduces leakage flux from the rotor magnet to the magnetic material portion of the base plate, suppressing eddy current loss in the base plate.

[0056] In the electronically controlled mechanical timepiece of the present disclosure, the frame body may have an extension portion that extends further toward the dial side than the jewel in the cross-sectional view, and the main plate may fix the extension portion. This allows the main plate to secure the extension that extends further toward the dial than the jewels, allowing the fixing point of the frame to be positioned closer to the dial, and therefore the rotor magnet and the main plate can be positioned apart.

[0057] In the electronically controlled mechanical timepiece of the present disclosure, the main plate may have a fixing portion that fixes the frame body, and an opening may be formed in the main plate on the rotor magnet side of the fixing portion. As a result, an opening is formed in the base plate on the rotor magnet side of the fixed portion, which prevents the base plate and the rotor magnet from being placed too close to each other on the rotor magnet side of the fixed portion, allowing the base plate and the rotor magnet to be placed farther apart. [Explanation of symbols]

[0058] 1...Electronically controlled mechanical watch, 2...External case, 3...Dial, 3A...Calendar window, 3B...Hour mark, 4A...Hour hand, 4B...Minute hand, 4C...Second hand, 6...Date indicator, 7...Crown, 10,10A...Movement, 11,11A...Main plate, 12,12A...Opposite surface, 13A...Fixed part, 14...Train bridge, 20...First mainspring, 21...First Barrel, 22...first barrel, 23...first barrel stem, 24...first ratchet wheel, 27...barrel intermediate wheel, 30...second mainspring, 31...second barrel, 32...second barrel, 34...second ratchet wheel, 40...manual winding mechanism, 50...automatic winding mechanism, 51...oscillating weight, 53...eccentric wheel, 54...pawl lever, 55...transmission wheel, 80...generator, 81...rotor, 82...rotating Rotating shaft, 823... flange, 824... shaft portion, 825... end face, 83... rotor pinion, 84... rotor magnet, 841... first surface, 842... second surface, 85... rotor inertia plate, 86... stopper, 88, 89... coil block, 881, 891... stator, 882, 892... coil, 90... display wheel train, 93... third wheel, 94... fourth wheel Wheel, 95...fifth wheel, 96...sixth wheel, 100,100A...first bearing, 110,110A...frame, 111,111A...retaining portion, 112,112A...positioning portion, 113A...extension portion, 120...hole jewel, 130...jewel, 140...pressure spring, 200...second bearing, 210...frame, 220...hole jewel, 230...jewel, 240...pressure spring.

Claims

1. a rotor provided on the rotating shaft, to which torque from the mainspring is transmitted, and a rotor magnet attached to the rotating shaft, the rotor being rotated by the torque; a generator having a coil and a stator, and generating electricity by rotation of the rotor; a base plate including a magnetic material and having a surface facing the stator; a bearing fixed to the base plate and supporting the rotation shaft of the rotor, In a cross-sectional view seen from a first direction perpendicular to the axial direction of the rotation shaft, a center of the stator along the axial direction is disposed closer to the opposing surface than a center of the rotor magnet along the axial direction. An electronically controlled mechanical watch characterized by:

2. 2. The electronically controlled mechanical timepiece according to claim 1, In the cross-sectional view, the rotor magnet and the stator are disposed at a position where they at least partially overlap when viewed from a second direction perpendicular to the axial direction and the first direction, and the center of the stator is disposed closer to the opposing surface than the surface of the rotor magnet that faces the base plate. An electronically controlled mechanical watch characterized by:

3. 3. The electronically controlled mechanical timepiece according to claim 2, In the cross-sectional view, the rotor magnet and the stator overlap by 35% or more of the dimension in the height direction of the rotor magnet when viewed from the second direction. An electronically controlled mechanical watch characterized by:

4. 4. The electronically controlled mechanical timepiece according to claim 3, In the cross-sectional view, the rotor magnet and the stator overlap by 50% or more of the dimension in the height direction of the rotor magnet when viewed from the second direction. An electronically controlled mechanical watch characterized by:

5. a dial having a front surface and a back surface; a main plate disposed on the back side of the dial and formed of a magnetic material; a rotor having a rotating shaft with tenons on both ends, a pinion provided on said rotating shaft to which torque from the mainspring is transmitted, and a rotor magnet attached to said rotating shaft, said rotor being disposed on the opposite side of said main plate from said dial and rotated by said torque; The clock comprises a frame body fixed to the base plate and formed of a non-magnetic material, a holed stone fixed to the frame body and through which one tenon of the rotating shaft is inserted, a bearing having a receiving stone disposed inside the frame body, and a pressure spring for pressing down the receiving stone, and for supporting the one tenon, In a cross-sectional view taken along a direction perpendicular to the axial direction of the rotary shaft, the frame is fixed to the main plate at a position closer to the dial than the hole jewel with respect to the rotor magnet. An electronically controlled mechanical watch characterized by:

6. 6. The electronically controlled mechanical timepiece according to claim 5, The frame body has an extension portion that extends toward the dial side more than the jewel in the cross-sectional view, The base plate fixes the extension portion. An electronically controlled mechanical watch characterized by:

7. 7. The electronically controlled mechanical timepiece according to claim 5 or 6, the base plate has a fixing portion that fixes the frame body, An opening is formed in the base plate on the rotor magnet side of the fixed portion. An electronically controlled mechanical watch characterized by:

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