Timepiece

Abstract

The present application provides a timepiece that can be downsized while maintaining magnetic resistance. The timepiece includes a case, a movement (10) disposed in the case and having a bottom plate, a train (50) disposed on the bottom plate and having a plurality of gear wheels, a train bridge (51) holding the train (50), and a first magnetic resistance member (31) disposed between the bottom plate and the train bridge (51) when viewed from a direction parallel to a surface of the bottom plate. The first magnetic resistance member (31) is annular when viewed from above and is disposed inward of an outer periphery of the bottom plate. At least a portion of the train (50) is disposed inward of the annular first magnetic resistance member (31) when viewed from above.

Description

Technical Field

[0001] This invention relates to clocks and watches. Background Technology

[0002] Patent Document 1 discloses the structure of an electronically controlled mechanical watch with a magnetic-resistant plate capable of shielding against external magnetic fields. Specifically, the magnetic-resistant plate is disposed on the back cover side of the movement and on the outer periphery of the movement.

[0003] Patent Document 1: Japanese Patent Application Publication No. 2001-108764 Summary of the Invention

[0004] However, in the technology described in Patent Document 1, because a non-magnetic plate is arranged on the back cover side and the outer periphery of the movement, the watch becomes thicker or the outer diameter of the watch becomes larger. That is, there is a requirement to achieve a thinner and smaller diameter watch while maintaining the non-magnetic performance.

[0005] The watch includes: a case; and a movement disposed within the case, having: a base plate; a gear train disposed on the base plate and having a plurality of gears; a gear train clamp that holds the gear train; and a first magnetic-resistant member, which, when viewed from the side in a direction parallel to the surface of the base plate, is disposed between the base plate and the gear train clamp, and when viewed from the top in a direction perpendicular to the surface of the base plate, is annular and disposed at a position inward of the outer periphery of the base plate, is disposed within the area where the gear train is disposed in the side view, and at least a portion of the gear train is disposed inside the first magnetic-resistant member in the top view. Attached Figure Description

[0006] Figure 1 This is a top view showing the structure of the dial side of a clock.

[0007] Figure 2 This is a top view showing the structure of the back cover side of the clock.

[0008] Figure 3 This is a top view showing the dial side of the movement.

[0009] Figure 4 This is a top view showing the date wheel with the movement removed.

[0010] Figure 5 yes Figure 2 and Figure 7 The shown is a cross-sectional view of the movement along the DD line.

[0011] Figure 6 This is a top view showing the back cover side of the movement.

[0012] Figure 7 It is a top view showing the movement with the gear train bridges removed.

[0013] Figure 8A This is a top view showing the structure of the first magnetically resistant component.

[0014] Figure 8B It is along Figure 8A The cross-sectional view of the first magnetically resistant component along line AA is shown.

[0015] Figure 8C It is along Figure 8A The cross-sectional view of the first magnetically resistant component along the BB line is shown.

[0016] Figure 9A This is a top view showing the structure of the second magnetically resistant component.

[0017] Figure 9B It is along Figure 9A A cross-sectional view of the second magnetically resistant component along the CC line.

[0018] Figure 10 It is shown in magnification Figure 7 A three-dimensional view of part E of the movement shown.

[0019] Figure 11 It is shown in magnification Figure 7 A three-dimensional view of part F of the movement shown.

[0020] Figure 12 It is a graph showing the relationship between the strength of the external magnetic field and the magnetic flux density flowing in the stator.

[0021] Figure 13A This is a cross-sectional view showing the fixing method of a modified example.

[0022] Figure 13B This is a cross-sectional view showing the fixing method of a modified example.

[0023] Figure 13C This is a cross-sectional view showing the fixing method of a modified example.

[0024] Label Explanation

[0025] 1: Clock; 2: Case; 3: Dial; 3A: Date window; 3B: Time markers; 4A: Hour hand; 4B: Minute hand; 4C: Second hand; 5: Power reserve scale; 6: Date wheel; 8: Glass cover; 9: Case back; 9A: Frame; 9B: Case back glass; 10: Movement; 11: Baseplate; 12: Crown; 13a: First fixing screw; 13b: Second fixing screw; 14: Clamping component; 15: Pendulum; 15A: Pendulum body; 15B: Opening; 15C: Outer perimeter; 21: Hour wheel; 22: Date changing wheel; 24: Coil assembly; 24a: Coil; 24b: Stator; 25: Gear train bridge; 26: Barrel wheel; 27: Second bridge; 28: Generator; 30: Antimagnetic component on the dial side; 31: First Magnetic-resistant component; 31a1: Stepped portion; 31a2: Bending portion; 31a: First main body portion; 31b: Second main body portion; 31c: First contact portion; 31d: Second contact portion; 32: Second magnetic-resistant component; 32a1: Stepped portion; 32a2: Stepped portion; 32a: First main body portion; 32b1: Stepped portion; 32b2: Stepped portion; 32b: Second main body portion; 32c: First contact portion; 32d: Second contact portion; 32e: Fixing portion; 40: Rotor; 41: Rotor magnet; 42: Rotor wheel; 43: Rotor inertia plate; 50: Display wheel system; 53: Wheel No. 3; 54: Wheel No. 4; 55: Wheel No. 5; 56: Wheel No. 6; 57: Eccentric wheel; 58: Transmission wheel. Detailed Implementation

[0026] In the following figures, the three mutually orthogonal axes are referred to as the X-axis, Y-axis, and Z-axis. The direction along the X-axis is designated as the "X-direction," the direction along the Y-axis as the "Y-direction," and the direction along the Z-axis as the "Z-direction." The direction of the arrow is the "+" direction, and the direction opposite to the "+" direction is designated as the "-" direction. Additionally, the +Z direction is sometimes referred to as "up" or "above," and the -Z direction as "down" or "below." Views from the +Z and -Z directions are also referred to as top views or plane views. Furthermore, the surface on the +Z side is designated as the upper surface, and the surface on the -Z side (opposite to it) is designated as the lower surface.

[0027] First, refer to Figure 1 and Figure 2 The structure of clock 1 will be explained.

[0028] like Figure 1 As shown, watch 1 is a wristwatch worn on a user's wrist, having a cylindrical case 2, with a dial 3 arranged on the inner circumference of the case 2. The opening on the face side of the two openings in the case 2 is blocked by a glass cover 8, and the opening on the back side is blocked by a back cover 9. Furthermore, the case 2 and the back cover 9 may not be separate pieces, but may be formed as a single piece.

[0029] like Figure 2As shown, the back cover 9 is composed of an annular frame 9A and a back cover glass 9B mounted on the frame 9A. The clock 1 of this embodiment is a skeleton-type clock that allows the pendulum 15 and the energy storage hand to be viewed from the back cover 9 side of the clock 1.

[0030] Clock 1 has: a movement 10 housed within the case 2 (see reference) Figure 2 The dial 3 includes an hour hand 4A, a minute hand 4B, and a second hand 4C for displaying time information, as well as a power reserve hand for indicating duration. A calendar window 3A is provided on the dial 3, through which the date wheel 6 is visible. Additionally, a time marker 3B is provided on the dial 3 for indicating the time. A fan-shaped power reserve scale 5 is provided on the back cover side of the gear train bridge 25 (described later). By indicating this power reserve scale 5 with the power reserve hand, the remaining winding amount of the mainspring can be displayed. Although not shown, the power reserve hand is mounted to rotate about the center of the fan-shaped power reserve scale 5.

[0031] A mounting bracket for the handle 12 is provided on the side of the housing 2 (see reference). Figure 3 The crown 7 is located in the movement 10. The crown 7 can be pulled out from the 0th position, which is pressed towards the center of the watch 1, and moved to the 1st and 2nd positions. When the crown 7 is rotated in the 0th position, the mainspring, which serves as a mechanical energy source, is wound in the movement 10. The energy storage hand moves in conjunction with the winding of the mainspring.

[0032] When the crown 7 is pulled to position 1 and rotated, the date wheel 6 moves to calibrate the date. When the crown 7 is pulled to position 2, the second hand 4C stops. When the crown 7 is rotated to position 2, the hour hand 4A and minute hand 4B move to calibrate the time.

[0033] like Figure 2 As shown, an opening 15B is formed in the hammer body 15A of the pendulum 15, thereby reducing the situation where the energy storage needle displaying the remaining winding amount of the mainspring cannot be visually seen due to the position of the pendulum 15.

[0034] Next, refer to Figures 3 to 5 The structure of the movement 10 as seen from the dial 3 side will be explained. Here, movement 10 refers to a structure assembled from the watch 1, excluding external components such as the case 2, dial 3, and hands 4A-4C, and including drive components such as the gear train for driving the hands 4A-4C. Furthermore, Figure 4 It shows from Figure 3 The movement 10 shown is in its state after the date wheel 6 has been removed. Figure 5 The movement 10 shown is configured with the side of the dial 3 (hereinafter referred to as the dial 3 side) facing downwards.

[0035] like Figure 3 and Figure 4As shown, the movement 10 has an hour wheel 21 mounted on the base plate 11. An hour hand 4A is fixed on the hour wheel 21. A date-changing intermediate wheel is mounted on the hour wheel 21, and a date-changing claw that rotates the date wheel 6 is mounted on the date-changing wheel 22 that rotates through the date-changing intermediate wheel.

[0036] like Figure 4 As shown, when the date wheel 6 is removed from the movement 10, a ring-shaped antimagnetic component 30 on the dial side is arranged overlapping the date wheel 6. The dial-side antimagnetic component 30 is used to shield against magnetic fields from outside the watch 1. Furthermore, a coil assembly 24 is arranged below and inside the ring-shaped dial-side antimagnetic component 30. This suppresses the influence of magnetic fields from the dial 3 side on the coil assembly 24.

[0037] The non-magnetic component 30 on the dial side is made of, for example, pure iron, permalloy, etc.

[0038] Next, refer to Figures 5 to 11 The structure of the movement 10 as seen from the side of the back cover 9 will be explained. Furthermore, Figure 7 It shows from Figure 6 The movement 10 shown is in the state where the gear train bridge 25 has been removed. As described above, Figure 5 The movement 10 shown is configured with the dial 3 side facing down, that is, with the back cover 9 side facing up.

[0039] like Figure 6 and Figure 7 As shown, the movement 10 viewed from the back cover 9 has a barrel wheel 26 for storing the mainspring. The hour hand 4A, minute hand 4B, and second hand 4C are respectively mounted on the hour wheel 21, minute wheel, and fourth wheel 54 of the movement 10, and are driven by the mainspring of the movement 10.

[0040] Movement 10 includes base plate 11 and second bridge plate 27 (see reference). Figure 5 The gear train clamp 25 holds the gear train in place. The base plate 11, the second clamp 27, and the gear train clamp 25 are flat, plate-shaped components with surfaces. For example... Figure 5 As shown, between the base plate 11 and the second clamping plate 27 and the gear train clamping plate 25 are arranged: a barrel for storing the mainspring; an energy storage and display mechanism; a manual winding mechanism and part of an automatic winding mechanism for winding the mainspring; a display gear train 50 that transmits the torque of the mainspring; and a generator 28 (see reference). Figure 5 The display gear train 50 is driven by torque transmitted via the display gear train 50; and a circuit board equipped with an IC (not shown) is driven by electricity from the generator 28 to control the rotation cycle of the display gear train 50.

[0041] like Figure 7As shown, the generator 28 is configured to include a rotor 40 and a coil assembly 24. The rotor 40 includes a rotor magnet 41, a rotor wheel 42, and a rotor inertia disc 43. Furthermore, as described later, torque from the mainspring is transmitted to the rotor 40 via a display gear train 50. The coil assembly 24 consists of a coil 24a and a stator 24b.

[0042] When the rotor 40 rotates due to the torque of the spring, the generator 28 can generate induced electricity through the coil assembly 24, output electrical energy and supply it to the IC, etc. In addition, by short-circuiting the coil 24a, braking can be applied to the rotor 40, and the braking force can be controlled by the IC, thereby making the rotation period of the rotor 40, that is, the rotation period of the display gear train 50, constant.

[0043] As described above, the clock 1 in this embodiment is configured as an electronically controlled mechanical clock. This electronically controlled mechanical clock uses the rotation of the rotor 40 of the generator 28, which generates induced electricity and outputs electrical energy, and is also used as a speed regulating mechanism.

[0044] The barrel stores the mainspring and includes a barrel wheel 26 and a barrel shaft. A large steel wheel 29, which rotates integrally with the barrel shaft, is mounted on the barrel shaft.

[0045] The automatic winding mechanism has the following features: Figure 5 The pendulum 15 shown; the bearing shown is omitted, which supports the axis of the pendulum 15 for free rotation and has a gear that rotates integrally with the pendulum 51. Figure 7 The eccentric wheel 57 shown meshes with the gear of the bearing; the pawl bar; and the drive wheel 58. When the pendulum 51 rotates, the large steel wheel 29, coaxially mounted on the barrel wheel 26, rotates via the eccentric wheel 57, the pawl bar, and the drive wheel 58, thereby winding the mainspring housed in the barrel wheel 26. Furthermore, in this embodiment, the description of the manual winding mechanism is omitted.

[0046] Next, the display gear train 50, which uses mechanical energy from the mainspring to drive the hour hand 4A, minute hand 4B, and second hand 4C, will be described. For example... Figure 7 As shown, the display wheel system 50 includes wheel 2, wheel 3, wheel 4, wheel 55, and wheel 6, and is mounted on the base plate 11. The rotation of the cartridge wheel 26 is transmitted to wheel 2, then sequentially increased in speed by wheel 3, wheel 4, wheel 55, and wheel 6, before being transmitted to the rotor 40. A minute hand 4B is fixed to wheel 2 via a minute wheel. A second hand 4C is fixed to wheel 4. Additionally, the hour wheel 21 is connected to the minute wheel via a cross wheel. An hour hand 4A is fixed to the hour wheel 21.

[0047] In addition, the eccentric wheel 57, ratchet bar, drive wheel 58, and display wheel system 50 in the bar box, automatic winding mechanism are sometimes collectively referred to as the wheel system.

[0048] like Figure 7 As shown, a first magnetically resistant component 31 is disposed on the inner side of the outer periphery of the base plate 11. That is, the first magnetically resistant component 31 is configured to overlap with a portion of the stator 24b of the coil assembly 24 when viewed from above.

[0049] Furthermore, when viewed from above along the Z-axis direction perpendicular to the surface of the base plate 11, in other words, when viewed from above in the -Z direction, the first magnetically resistant member 31 is formed in a ring shape. When viewed from above, at least a portion of the gear train is disposed inside the first magnetically resistant member 31. Specifically, at least a fourth wheel 54, an eccentric wheel 57, and a transmission wheel 58 are disposed inside the first magnetically resistant member 31. In other words, the ring-shaped first magnetically resistant member 31 is disposed in a manner that avoids a portion of the gear train at the center of the movement 10.

[0050] In addition, such as Figure 5 As shown, when viewed from the side in a direction parallel to the surface of the rear cover 9, the first magnetic-resistant component 31 is disposed between the base plate 11 and the wheel train clamping plate 25. Specifically, the first magnetic-resistant component 31 is at the same height as a portion of the wheel train and is disposed within the area where the wheel train is disposed in the Z direction perpendicular to the surface of the base plate 11.

[0051] Furthermore, the same height in this embodiment is not limited to a state where the height of a portion of the components constituting the gear train, such as the second wheel 52, the third wheel 53, the fourth wheel 54, the drive wheel 58, the pawl, and the eccentric wheel 57, is aligned with the height of the first magnetic component 31. For example, when viewed from the side, this includes a state where the first magnetic component 31 overlaps with a portion of the component, and a state where the first magnetic component 31 is positioned closer to the base plate than the component positioned on the rear cover side of the gear train. In this embodiment, the first magnetic component 31 is positioned closer to the base plate side than the eccentric wheel 57. That is, since the first magnetic component 31 is positioned at a height within the Z-direction range of the components constituting the gear train when viewed from the side, the thickness of the watch 1 can be reduced compared to the case where the magnetic component is positioned on the rear cover 9 side of the movement 10, as in the prior art.

[0052] like Figure 7 As shown, in a top view, a second magnetic-resistant component 32 is positioned outside the first magnetic-resistant component 31 and inside the outer periphery of the base plate 11. Specifically, the second magnetic-resistant component 32 is positioned to cover a portion of the side surface of the generator 28 (see reference). Figure 10 Furthermore, the second magnetic-resistant component 32 is in contact with a portion of the first magnetic-resistant component 31 (see reference). Figure 10 ).

[0053] Furthermore, the first magnetic-resistant component 31 and the second magnetic-resistant component 32 are formed of pure iron, permalloy, etc., similar to the magnetic-resistant component 30 on the dial side.

[0054] like Figure 8A , Figure 8B , Figure 8C As shown, the annular first magnetically resistant component 31 includes a first main body portion 31a, a second main body portion 31b, a first contact portion 31c, and a second contact portion 31d. The second main body portion 31b is positioned higher than the first main body portion 31a, separated by a step difference portion 31a1. The first contact portion 31c and the second contact portion 31d are positioned lower than the first main body portion 31a, separated by a bend portion 31a2.

[0055] like Figure 9A as well as Figure 9B As shown, the second magnetically resistant member 32 is bent to surround half of the outer periphery of the first magnetically resistant member 31. The second magnetically resistant member 32 includes a first main body portion 32a, a second main body portion 32b, a first contact portion 32c, a second contact portion 32d, and a fixing portion 32e.

[0056] Specifically, the first main body portion 32a and the second main body portion 32b are disposed at the same height. The first contact portion 32c is disposed at a lower position than the first main body portion 32a, separated by a step difference portion 32a1. The second contact portion 32d is disposed at a lower position than the second main body portion 32b, separated by a step difference portion 32b1. The fixing portion 32e is disposed at a lower position than the first main body portion 32a and the second main body portion 32b, separated by step differences portions 32a2 and 32b2.

[0057] That is, the first magnetically resistant component 31 has a stepped difference in the axial direction (Z direction) of the housing 2, and in this embodiment, it has a stepped difference portion 31a1. A large steel wheel 29, as part of the gear train, is arranged within the stepped difference formed by the stepped difference portion 31a1. Thus, since part of the gear train is arranged within the stepped difference of the first magnetically resistant component 31, in other words, since the first magnetically resistant component 31 is housed within the height range of the gear train, it is possible to arrange the first magnetically resistant component 31 within the movement 10 while making the watch 1 thinner. Furthermore, by providing a stepped difference, it is not necessary to provide a cut on the first magnetically resistant component 31 to avoid the large steel wheel 29, and the first magnetically resistant component 31 can be made into a continuous ring shape. As a result, as will be described later, the influence of external magnetic fields on the stator 24b can be reduced.

[0058] like Figure 7 As shown, at part E, the first magnetically resistant component 31 and the second magnetically resistant component 32 are in contact with each other at the first contact portion 31c and the first contact portion 32c. Furthermore, the first magnetically resistant component 31 and the second magnetically resistant component 32 are fixed to, for example, the base plate 11 by the first fixing screw 13a (see reference). Figure 10On the other hand, at part F, the second contact portion 31d of the first magnetically resistant component 31 contacts the second contact portion 32d of the second magnetically resistant component 32. Furthermore, the first magnetically resistant component 31 and the second magnetically resistant component 32 are fixed to, for example, the base plate 11 by the second fixing screw 13 (see reference). Figure 11 ).

[0059] Furthermore, the fixing portion 32e of the second magnetically resistant component 32 is fixed to the base plate 11 without passing through the first magnetically resistant component 31. Moreover, the contact between the first magnetically resistant component 31 and the second magnetically resistant component 32 is not limited to two locations; contact can occur at three or more locations. Furthermore, contact is not limited to the first contact portions 31c, 32c, and the second contact portions 31d, 32d; contact can also occur using other portions.

[0060] In this way, by arranging the first magnetically resistant component 31 and the second magnetically resistant component 32 in contact with each other, a magnetic path that does not pass through an air layer can be formed between the second magnetically resistant component 32 and the first magnetically resistant component 31, thereby improving the magnetic resistance performance. In addition, by assembling the first magnetically resistant component 31 and the second magnetically resistant component 32 inside the movement 10, the watch 1 can be miniaturized compared to placing the magnetically resistant component between the movement 10 and the case 2.

[0061] In addition, such as Figure 5 As shown, in order to make the pendulum 15 rotate smoothly and easily, the thickness L1 of the outer periphery 15C, which is the weight, is thicker than the thickness L2 of the hammer body 15A. However, by making the outer periphery 15C decrease in the Z direction in accordance with the step difference of the first magnetic component 31, the thickness of the clock 1 can be reduced compared to the case where the thickness of the clock 1 increases due to the thickening of the outer periphery 15C in the +Z direction, as in the prior art.

[0062] Next, refer to Figure 12 The following explains how the configuration of the first magnetically resistant component 31 affects, for example, how much magnetic flux density affects the stator 24b constituting the coil assembly 24.

[0063] Figure 12 This is a graph showing the results of magnetic field analysis obtained by analyzing the relationship between the strength (G) of the externally received magnetic field and the magnetic flux density (T) generated in the stator 24b for different shapes of the first magnetically resistant component 31. The horizontal axis represents the strength (G) of the externally received magnetic field, which increases as it moves to the right. The vertical axis represents the magnetic flux density (T) generated in the stator 24b, which increases as it moves upward.

[0064] The magnetically resistant components used in magnetic field analysis come in five shapes: ring-shaped (i.e., annular), C-ring with a partial ring defect, narrow rectangle, wide rectangle 1, and wide rectangle 2. Furthermore, as an analytical condition, since the magnetic resistance performance depends on the volume of the magnetically resistant component, all shapes are designed as plates with a uniform thickness. Moreover, all shapes except wide rectangle 2 have the same volume; only wide rectangle 2 is shorter in length than wide rectangle 1 and has a smaller volume than the other shapes. Additionally, each magnetically resistant component is arranged to overlap with the stator in the coil assembly.

[0065] like Figure 12 As shown, the most effective shape is a ring shape, where the magnetic flux density affecting the stator 24b is small even when the external magnetic field strength is high. As in this embodiment, since the first magnetically resistant member 31 is ring-shaped, the influence of the external magnetic field can be minimized.

[0066] As described above, the clock 1 of this embodiment includes: a housing 2; and a movement 10 disposed in the housing 2, having: a base plate 11, a gear train disposed on the base plate 11 and having a plurality of gears, a gear train clamp 25 for holding the gear train, and a first magnetically resistant member 31. When viewed from the side in a direction parallel to the surface of the base plate 11, the first magnetically resistant member 31 is disposed between the base plate 11 and the gear train clamp 25. When viewed from the top in a direction perpendicular to the surface of the base plate 11, the first magnetically resistant member 31 is annular and is disposed at a position closer to the inner side of the outer periphery of the base plate 11. When viewed from the side, it is disposed within the area where the gear train is disposed. When viewed from the top, at least a portion of the gear train is disposed inside the first magnetically resistant member 31.

[0067] According to this structure, since the first magnetically resistant component 31 is positioned inside the outer periphery of the base plate 11 when viewed from above, and is positioned within the area where the gear train is located when viewed from the side, it is possible to reduce the outer diameter of the clock 1 (smaller diameter) while maintaining the magnetic resistance performance, and also to make the thickness of the clock 1 thinner.

[0068] Furthermore, in the watch 1 of this embodiment, it is preferable that the movement 10 includes a mainspring and a generator 28 driven by the mainspring to generate electrical energy, and that a first magnetic-resistant member 31 covers a portion of the generator 28 on the rear cover 9 side. According to this structure, in the watch 1 which includes a mechanical energy source and a generator 28, since the first magnetic-resistant member 31 covers a portion of the generator 28, the influence of external magnetic fields on the generator 28 can be suppressed, thereby maintaining its magnetic resistance. Furthermore, the watch 1 can be miniaturized.

[0069] Furthermore, in the watch 1 of this embodiment, it is preferable that the movement 10 includes a second magnetic-resistant member 32 covering a portion of the side surface of the generator 28. When viewed from above, the second magnetic-resistant member 32 is positioned closer to the outer periphery of the base plate 11 and contacts a portion of the first magnetic-resistant member 31. According to this structure, since the second magnetic-resistant member 32, positioned closer to the outer periphery of the base plate 11, contacts a portion of the first magnetic-resistant member 31, a magnetic path that does not pass through an air layer can be formed between the second magnetic-resistant member 32 and the first magnetic-resistant member 31. Therefore, it is possible to improve the magnetic resistance performance while miniaturizing the watch 1.

[0070] Furthermore, in the watch 1 of this embodiment, it is preferable that the first magnetic-resistant member 31 has a stepped difference in a direction perpendicular to the surface of the base plate 11, and a portion of the gear train is disposed within the stepped difference. According to this structure, since a portion of the gear train is disposed within the stepped difference of the first magnetic-resistant member 31, in other words, since the first magnetic-resistant member 31 is housed within the height range of the gear train, it is possible to make the watch 1 thinner while simultaneously disposing of the first magnetic-resistant member 31 within the movement 10.

[0071] Hereinafter, variations of the above-described embodiments will be described.

[0072] In the above-described embodiment, as a structure for forming a magnetic path that does not pass through an air layer, a structure is described in which the first magnetically resistant member 31 and the second magnetically resistant member 32 are contacted and fixed by the first fixing screw 13a and the second fixing screw 13b, but it is not limited to this. For example, it may be as follows: Figures 13A-13C As shown.

[0073] Figure 13A The diagram shows a structure in which the first magnetically resistant component 31 is pressed by a spring force to make it contact the second magnetically resistant component 32. Figure 13B The diagram illustrates a configuration in which a protrusion formed on the first magnetically resistant member 31 is inserted into a hole formed on the second magnetically resistant member 32 for contact fixation. Alternatively, the first magnetically resistant member 31 and the second magnetically resistant member 32 may be configured in opposite ways. Figure 13C The structure uses clamping member 14 to contact and fix the first magnetically resistant member 31 and the second magnetically resistant member 32. According to these methods, a magnetic path that does not pass through an air layer can be formed between the second magnetically resistant member 32 and the first magnetically resistant member 31, thereby improving the magnetic resistance performance.

[0074] In the above-described embodiment, a clock 1 is described as an electronically controlled mechanical clock. This clock 1 has a mainspring, a generator 28 driven by the mainspring to generate electrical energy, and an IC that controls the rotational speed of the display gear train 50, but is not limited thereto. For example, it can also be applied to clocks that do not have a generator 28 but have a mechanical energy source with a mainspring, a pendulum 15, an automatic winding gear train that winds the mainspring based on the rotation of the pendulum 15, and a speed regulator such as a balance wheel.

[0075] Based on this structure, it is possible to simultaneously maintain magnetic resistance and miniaturize the watch in a mechanical timepiece.

Claims

1. A type of clock, The clock features: Casing; and The movement, disposed within the housing, includes: a base plate; a gear train disposed on the base plate and having a plurality of gears; a gear train clamp for holding the gear train; and a first antimagnetic component, which, when viewed from the side in a direction parallel to the surface of the base plate, is disposed between the base plate and the gear train clamp. When viewed from above perpendicular to the surface of the base plate, the first magnetically resistant component is annular and positioned inward from the outer periphery of the base plate. When viewed from the side, the first magnetically resistant component is positioned within the area where the gear train is located. In the top view, at least a portion of the gear train is positioned inside the first magnetically resistant component.

2. The clock according to claim 1, wherein, The movement has: A mechanical energy source, which has a spring; pendulum; as well as An automatic winding train winds the mainspring based on the rotation of the pendulum. The gear train is an automatic winding gear train.

3. The clock according to claim 1, wherein, The movement features: Mechanical energy source; and A generator, driven by the aforementioned mechanical energy source, produces electrical energy. The first magnetic-resistant component covers a portion of the generator on the back cover side of the clock.

4. The clock according to claim 3, wherein, The mechanism includes a second non-magnetic component that covers a portion of the side of the generator. In the top view, the second magnetic-resistant component is positioned inside the outer periphery of the base plate and contacts a portion of the first magnetic-resistant component.

5. The clock according to claim 3, wherein, The first magnetically resistant component has a stepped difference in a direction perpendicular to the surface of the base plate, and a portion of the gear train is disposed within the stepped difference.

Images