clock

Abstract

To provide a timepiece that is resistant to static electricity and can reduce a volume occupied by a coil spring inside a case.SOLUTION: A timepiece 1 includes: a dial 5 which includes a center part 21 having a non-conductive surface in a plane view, and a peripheral part 22 having a conductive surface and provided around a periphery of the center part 21; and a case 3 which is conductive to the peripheral part 22 and to a rear lid 17.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a timepiece. [Background technology]

[0002] When wearing a wristwatch, static electricity can be transmitted from the outside to the dial. If this static electricity charges the circuit block, it could destroy the integrated circuit. Static electricity on the dial needs to be removed to the outside of the watch without passing through the circuit block. Patent Document 1 discloses a watch with a structure that allows static electricity from the dial to flow to the back cover. According to this, through holes are formed in the base plate, housing, and circuit board that run through the thickness of the base plate. A coil spring is installed in the through hole. The coil spring connects the dial and back cover in a conductive state. The static electricity on the dial flows through the coil spring to the back cover.

[0003] Multifunctional watches have many parts stored inside the case. This makes the case larger, making it difficult for people with thin wrists to wear. Even watches that do not have many functions are in demand for smaller watches. When making a watch smaller, it is necessary to reduce the volume of the parts that occupy the inside of the case. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 9-230065 Summary of the Invention [Problem to be solved by the invention]

[0005] The watch in Patent Document 1 has a coil spring inside the case through which static electricity flows. It is necessary to ensure a certain volume inside the case for the coil spring. When making a wristwatch smaller or adding multiple functions, the volume of the parts that conduct electricity between the dial and case back must be reduced. There has been a demand for a watch structure that is static-resistant and allows the volume occupied by the coil spring inside the case to be reduced. [Means for solving the problem]

[0006] The timepiece comprises a dial having a central portion whose surface is non-conductive in a plan view and an outer peripheral portion whose surface is conductive and is provided on the outer periphery of the central portion, and a case that is conductive to the outer peripheral portion and also to the back cover.

[0007] In a watch, static electricity that enters the dial passes through the case, which is conductive to the outer periphery of the dial, and flows to the back cover. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a schematic cross-sectional side view showing the internal structure of a timepiece according to a first embodiment. [Figure 2] FIG. [Figure 3] FIG. [Figure 4] FIG. 4 is a schematic cross-sectional side view of a main part illustrating a structure in which the dial and the case are electrically connected. [Figure 5] 10 is a schematic side cross-sectional view of a main part illustrating the structure in which the dial and the case are electrically connected according to a second embodiment. [Figure 6] FIG. 10 is a schematic plan view showing the structure of the dial according to the third embodiment. [Figure 7] FIG. [Figure 8] FIG. 4 is a schematic cross-sectional side view of a main part illustrating a structure in which the dial and the case are electrically connected. [Figure 9] FIG. 10 is a schematic cross-sectional side view of a main part for explaining the structure in which the dial and the case are electrically connected according to a fourth embodiment. [Figure 10] FIG. 11 is a schematic cross-sectional side view of a main part for explaining the structure in which the dial and the case are electrically connected according to a fifth embodiment. [Figure 11] FIG. 13 is a schematic cross-sectional side view of a main part for explaining the structure in which the dial and the case are electrically connected according to a sixth embodiment. [Figure 12] FIG. 13 is a schematic cross-sectional side view of a main part for explaining the structure in which the dial and the case are electrically connected according to the seventh embodiment. [Figure 13] FIG. 13 is a schematic cross-sectional side view of a main part for explaining the structure in which the dial and the case are electrically connected according to the eighth embodiment. [Figure 14] FIG. 13 is a schematic cross-sectional side view of a main part for explaining the structure in which the dial and the case are electrically connected according to the ninth embodiment. [Figure 15] FIG. 23 is a schematic cross-sectional side view of a main part for explaining the structure in which the dial and the case are electrically connected according to the tenth embodiment. [Figure 16] FIG. 23 is a schematic cross-sectional side view of a main part for explaining the structure in which the dial and the case are electrically connected according to the eleventh embodiment. [Figure 17] FIG. 23 is a schematic side view illustrating the structure of the dial according to the twelfth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0009] First embodiment In this embodiment, a characteristic example of a timepiece will be described. A timepiece according to a first embodiment will be described with reference to the drawings.

[0010] As shown in Figure 1, clock 1 is a wristwatch. A crystal plate 2 is placed on a case 3 at the top of clock 1 in the figure. The crystal plate 2 side in the thickness direction of clock 1 is the Z positive direction. The 12 o'clock direction of clock 1 is the X positive direction. The 9 o'clock direction of clock 1 is the Y positive direction.

[0011] Crystal plate 2 is fixed to case 3 via first gasket 4. Crystal plate 2 is made of a light-transmitting material such as glass. Dial 5 is disposed on the negative Z direction of crystal plate 2. Hour hand 6, minute hand 7, and second hand 8 are disposed between dial 5 and crystal plate 2. The operator can see hour hand 6, minute hand 7, and second hand 8 through crystal plate 2. A scale is disposed on dial 5. The operator can tell the current time by looking at the positions of hour hand 6, minute hand 7, and second hand 8 relative to the scale.

[0012] A movement 9 and a battery 11 are arranged on the negative Z side of the dial 5. The movement 9 has a main plate 12. The main plate 12 is arranged opposite the dial 5. A motor 13 and a wheel train 14 are arranged on the main plate 12. The movement 9 has a circuit board 15 that drives the motor 13. The circuit board 15 has a CPU (Central Processing Unit), a quartz oscillator, a divider circuit, a motor drive circuit, etc. The watch 1 is a quartz watch. If static electricity flows through the circuit board 15, there is a risk that circuit elements such as the CPU will be destroyed. It is necessary to prevent static electricity from flowing through the circuit board 15.

[0013] Circuit board 15 controls the rotation speed of motor 13. The torque of motor 13 is transmitted to gear train 14. In the center of the figure, a pointer stud 14a of gear train 14 protrudes in the positive Z direction and penetrates dial 5. Hour hand 6, minute hand 7, and second hand 8 are attached to the protruding pointer stud 14a. Circuit board 15 controls the motor 13 and gear train 14 to rotate hour hand 6, minute hand 7, and second hand 8, thereby controlling the position at which each hand indicates the scale.

[0014] A guide frame 16 is arranged on the outer periphery of the movement 9 in the X and Y directions. The guide frame 16 is located between the case 3 and the movement 9. When an impact is applied to the watch 1 from the X and Y directions, the guide frame 16 absorbs the impact. The guide frame 16 reduces the impact applied to the movement 9.

[0015] A back cover 17 is disposed on the negative Z side of the case 3. A second packing 18 is disposed between the back cover 17 and the case 3. The second packing 18 prevents moisture from entering the interior of the timepiece 1.

[0016] 2 and 3, the outer shape of the dial 5 is not particularly limited, but in this embodiment, for example, it is a disk shape. A central hole 5a through which the pivot 14a passes is located in the center of the dial 5. Four recesses 5b are located on the outer periphery of the dial 5. The recesses 5b are used to align the dial 5 with the case 3.

[0017] The dial 5 comprises a conductive substrate 19. The substrate 19 comprises a first surface 19a and a second surface 19b. The first surface 19a is the surface on the crystal 2 side. The second surface 19b is the surface on the movement 9 side. The dial 5 has a central portion 21 and an outer peripheral portion 22. The central portion 21 is located in the center of the first surface 19a of the substrate 19 in a planar view. The outer peripheral portion 22 is located on the outer periphery of the central portion 21. The outer peripheral portion 22 includes the first surface 19a, the second surface 19b and the side surface 19c. In a planar view of the dial 5 seen from the crystal 2 side, the outer peripheral portion 22 overlaps with the case 3.

[0018] The dial 5 has a paint film 23 in the central portion 21. The paint film 23 is a resin film. The paint film 23 is formed by applying a resin material to the first surface 19a and drying it. Various printing methods such as offset printing and screen printing are used for application. Graduations 24 are arranged on the paint film 23. The paint film 23 is non-conductive. Therefore, the surface of the central portion 21 is non-conductive. The non-conductive central portion 21 of the dial 5 is achieved by the paint film 23.

[0019] According to this configuration, the dial 5 has a paint film 23 in the center portion 21. The paint film 23 can be painted with any desired paint, and the design of the dial 5 can be improved.

[0020] The dial 5 does not have a paint film 23 on the outer periphery 22. The surface of the outer periphery 22 is conductive. In addition, the surface of the outer periphery 22 is provided with a metal film 25 formed by plating. The outer periphery 22 is electrically connected to the substrate 19, and the surface is made of the conductive metal film 25. There are no particular restrictions on the material of the metal film 25, but in this embodiment, for example, nickel is used.

[0021] According to this configuration, the outer peripheral portion 22 is plated, which prevents oxidation, discoloration, and corrosion of the outer peripheral portion 22. As a result, the electrical resistance between the outer peripheral portion 22 and the case 3 can be maintained low. A gold film may be laminated on top of the nickel film. This reduces contact resistance.

[0022] The manufacturing process for the dial 5 is not particularly limited, but in this embodiment, the dial 5 is manufactured, for example, in the following order of steps. First, a plate-shaped material is blanked to form the outer shape of the substrate 19 and the central hole 5a. Next, the substrate 19 is cleaned. A coating film 23 is formed on the first surface 19a of the substrate 19. Next, the scale 24 is printed. Next, the outer periphery 22 of the first surface 19a is machined. A numerically controlled machining center is used for the cutting process. In the cutting process, the substrate 19 is cut to a depth of approximately 0.05 mm from the surface of the substrate 19. At this time, the coating film 23 on the outer periphery 22 is removed by cutting. The substrate 19 is exposed at the outer periphery 22. Next, the exposed outer periphery 22 of the substrate 19 is nickel-plated. The plating may be electroplating or electroless plating. A metal film 25 may be formed on the side surface 19c and the second surface 19b. The dial 5 is completed through the above steps.

[0023] As shown in FIG. 4 , the dial 5 is sandwiched between the case 3 and the guide frame 16 in the Z direction. Furthermore, the dial 5 and the guide frame 16 are sandwiched between the case 3 and the back cover 17. The guide frame 16 is made of a resin material. The guide frame 16 contracts while sandwiched between the case 3 and the back cover 17. The guide frame 16 presses against the dial 5. The metal film 25 on the outer periphery 22 of the dial 5 is pressed against the case 3.

[0024] A protrusion 17a is formed on the outer periphery of the back cover 17. A recess 3a is formed on the case 3 in a position facing the protrusion 17a. When the case 3 and back cover 17 are assembled, the protrusion 17a fits into the recess 3a. The case 3 and back cover 17 are fitted together. Because the case 3 and back cover 17 are made of metal, they are electrically connected. Therefore, the case 3 is electrically connected to the metal film 25 on the outer periphery 22 of the dial 5, and is also electrically connected to the back cover 17. This "electrically connected" includes both an electrical connection through direct contact and an electrical connection via a conductive member.

[0025] The watch 1 is worn on the human body 26. Static electricity is discharged to the dial 5. Current 27 due to the static electricity enters the substrate 19 of the dial 5. Current 27 due to the static electricity entering the dial 5 passes through the case 3, which is conductive with the outer periphery 22 of the dial 5, and flows to the back cover 17. More specifically, current 27 passes through the substrate 19, metal film 25, case 3, and back cover 17 and enters the human body 26.

[0026] With this configuration, current 27 due to static electricity entering dial 5 flows to human body 26 via substrate 19, outer periphery 22 of dial 5, case 3, and back cover 17. Watch 1 does not include a coil spring that occupies a certain volume, as in Patent Document 1. Specifically, watch 1 does not include components such as a coil spring that conducts current 27 due to static electricity. As a result, the volume occupied by the coil spring inside case 3 can be reduced. Reducing the interior of case 3 allows for a more compact watch 1. Additionally, the case 3 can be designed with large irregularities on the exterior. Furthermore, because no coil spring is included, the number of coil spring components can be reduced. Furthermore, when viewed from the crystal 2 side, the case 3 and dial 5 are electrically connected where they overlap. This allows for effective use of the space inside case 3.

[0027] Second embodiment This embodiment differs from the first embodiment in that the timepiece has a conductive portion between the metal film 25 of the dial 5 and the case 3. Note that the same components as those in the first embodiment are given the same reference numerals and redundant explanations will be omitted.

[0028] As shown in Figure 5, a timepiece 31 has a case 32 and a dial 5. A conductive part 33 is arranged between the case 32 and the outer periphery 22 of the dial 5. The conductive part 33 provides electrical continuity between the outer periphery 22 of the dial 5 and the case 32. The conductive part 33 is composed of a leaf spring 34 and conductive double-sided tape 35. The conductive double-sided tape 35 secures the leaf spring 34 to the case 32. The leaf spring 34 is elastic. Therefore, the conductive part 33 is elastic.

[0029] According to this configuration, the conductive portion 33 provides electrical continuity between the outer periphery 22 of the dial 5 and the case 32. As a result, electrical continuity between the outer periphery 22 and the case 32 can be ensured.

[0030] With this configuration, the conductive portion 33 has elasticity and presses the outer periphery 22 of the dial 5 against the case 32. As a result, the conductive portion 33 can reduce the contact resistance between the outer periphery 22 and the case 32.

[0031] Static electricity is discharged to the dial 5. Current 27 due to static electricity enters the substrate 19 of the dial 5. Current 27 due to static electricity entering the dial 5 passes through the substrate 19, metal film 25, conductive part 33, case 32, and back cover 17 and enters the human body 26.

[0032] Third embodiment This embodiment differs from the first embodiment in that a leaf spring is provided on the outer periphery of the dial. Note that the same components as those in the first embodiment are given the same reference numerals, and redundant explanations will be omitted.

[0033] As shown in Figures 6 and 7, timepiece 38 has a dial 39. Figure 6 is a view of dial 39 from the crystal 2 side. Figure 7 is a view of dial 39 from the movement 9 side. Dial 39 has a substrate 41 which is a conductive member. Substrate 41 has a first surface 41a and a second surface 41b. First surface 41a is the surface on the crystal 2 side. Second surface 41b is the surface on the movement 9 side.

[0034] The outer shape of the dial 39 is not particularly limited, but in this embodiment, for example, it is a disk shape. A central hole 39a through which the pivot 14a passes is disposed in the center of the dial 39. Four concave-convex portions 39b are disposed on the outer periphery of the dial 39. The concave-convex portions 39b are used for alignment with the case 3.

[0035] The dial 39 has a central portion 42 and an outer peripheral portion 43. The central portion 42 is on the base plate 41 in a plan view. The outer peripheral portion 43 is outside the outer periphery of the base plate 41.

[0036] The dial 39 has a coating film 23 on the center portion 42. The coating film 23 is a resin film. The coating film 23 is formed by applying a resin material to the first surface 41a and drying it. The coating film 23 is non-conductive. Therefore, the surface of the center portion 21 is non-conductive.

[0037] Four leaf springs 44 are fixed to the second surface 41b of the base plate 41 of the dial 39 by, for example, spot welding. The leaf springs 44 located on the outer periphery 43 are conductive parts 45. The conductive parts 45 also serve as the outer periphery 43. When the dial 39 is viewed from the crystal plate 2 side, the leaf springs 44 protrude from the outer periphery of the base plate 41. The four leaf springs 44 may also be fixed by a method other than spot welding, such as with conductive double-sided tape.

[0038] 8, the timepiece 38 includes a case 46, a guide frame 47, and a movement 48. In the Z direction, the case 46 has a first protrusion 46a at a location facing the conductive portion 45. The first protrusion 46a comes into contact with the conductive portion 45 of the outer circumferential portion 43, providing electrical continuity.

[0039] With this configuration, the outer periphery 43 comes into contact with the first protrusion 46a. Without the first protrusion 46a, there is a possibility that the leaf spring 44 and the case 46 would come into point contact when the leaf spring 44 twists. By providing the first protrusion 46a, it is possible to ensure a sufficient contact area between the case 46 and the conductive portion 45 of the outer periphery 43, even when the leaf spring 44 twists. Therefore, poor contact between the case 46 and the dial 39 can be prevented.

[0040] In the dial 39, the conductive portion 45 is the outer periphery 43. The conductive portion 45 is electrically connected to the case 46. Therefore, the conductive portion 45 electrically connects the outer periphery 43 and the case 46.

[0041] According to this configuration, the conductive portion 45 provides electrical continuity between the outer peripheral portion 43 and the case 46. As a result, electrical continuity between the outer peripheral portion 43 and the case 46 can be ensured.

[0042] The conductive portion 45 is part of the leaf spring 44 and has elasticity. With this configuration, the conductive portion 45 has elasticity, so that the outer peripheral portion 43 presses against the case 46. As a result, the conductive portion 45 can reduce the contact resistance between the outer peripheral portion 43 and the case 46. The leaf spring 44 may be provided on the first surface 41a of the substrate 41. There are no particular limitations on the method for fixing the leaf spring 44, but in this embodiment, for example, conductive double-sided tape is used.

[0043] Static electricity is discharged to the dial 39. Current 27 due to static electricity enters the substrate 41 of the dial 39. Current 27 due to static electricity entering the dial 39 passes through the substrate 41, conductive part 45, case 46, and back cover 17 and enters the human body 26.

[0044] Fourth embodiment This embodiment differs from the first embodiment in that the portion corresponding to the case 3 is composed of a case and a first member. Note that the same components as those in the first embodiment are denoted by the same reference numerals, and redundant explanations will be omitted.

[0045] As shown in Figure 9, a watch 51 comprises a case 52 and a first member 53. The first member 53 is also called the bezel. The case 52 and the first member 53 are connected via a third gasket 54. The crystal plate 2 is fixed to the first member 53 via a first gasket 4. The dial 5 is fixed by being sandwiched between the first member 53 and the guide frame 16. The outer periphery 22 of the dial 5 contacts the first member 53 and is electrically conductive. A first leaf spring 55 is disposed between the case 52 and the first member 53. The first leaf spring 55 ensures electrical conductivity between the case 52 and the first member 53.

[0046] The first member 53 contacts the outer periphery 22 of the dial 5. The first member 53 is electrically connected to the metal film 25 of the outer periphery 22. The first member 53 is electrically connected to the case 52. With this configuration, the case 52 is electrically connected to the first member 53. The first member 53 is electrically connected to the outer periphery 22 of the dial 5. The case 52 is structured to house the movement 9. Compared to when the case 52 and the first member 53 are formed as a single piece, the first member 53 can be made to have a shape that makes it easier to connect to the outer periphery 22. In addition, the case 52 and the first member 53 can be made easier to manufacture. In a plan view of the dial 5 seen from the crystal 2 side, the outer periphery 22 overlaps the first member 53. The portion where the first member 53 contacts the dial 5 may be a dial ring.

[0047] A recess 52b is formed in the case 52 at a location facing the protrusion 17a. When the case 52 and the back cover 17 are assembled, the protrusion 17a fits into the recess 52b.

[0048] The current 27 due to static electricity entering the dial 5 passes through the substrate 19, the metal film 25, the first member 53, the first leaf spring 55, the case 52, and the back cover 17 and enters the human body 26.

[0049] Fifth embodiment This embodiment differs from the fourth embodiment in that a conductive part 33 is disposed between the dial 5 and the first member. Note that the same components as those in the fourth embodiment are given the same reference numerals, and redundant explanations will be omitted.

[0050] As shown in Figure 10, a timepiece 58 comprises a case 52 and a first member 59. The case 52 and the first member 59 are joined via a third packing 54. The crystal plate 2 is fixed to the first member 59 via a first packing 4. The dial 5 is sandwiched and fixed between the first member 59 and the guide frame 16.

[0051] A recess 59a is formed in the first member 59 at a location facing the outer periphery 22 of the dial 5. A conductive portion 33 is arranged in the recess 59a between the first member 59 and the outer periphery 22 of the dial 5. The conductive portion 33 provides electrical continuity between the outer periphery 22 of the dial 5 and the first member 59. The conductive portion 33 is composed of a leaf spring 34 and conductive double-sided tape 35. The conductive double-sided tape 35 fixes the leaf spring 34 to the first member 59. The leaf spring 34 is elastic. Therefore, the conductive portion 33 is elastic.

[0052] According to this configuration, the conductive portion 33 electrically connects the outer circumferential portion 22 and the first member 59. As a result, electrical continuity between the outer circumferential portion 22 and the first member 59 can be ensured.

[0053] Current 27 due to static electricity entering dial 5 passes through substrate 19, metal film 25, leaf spring 34, conductive double-sided tape 35, first member 59, first leaf spring 55, case 52, and back cover 17 before entering human body 26. Therefore, current 27 due to static electricity does not flow through circuit board 15, and watch 58 is static-resistant.

[0054] Sixth embodiment This embodiment differs from the third embodiment in that the portion corresponding to the case 3 is composed of a case and a first member, as in the fourth embodiment. Note that the same components as those in the third and fourth embodiments are denoted by the same reference numerals, and redundant explanations will be omitted.

[0055] As shown in Figure 11, a timepiece 62 has a dial 39. Four leaf springs 44 are fixed to the second surface 41b of the dial 39 by spot welding. The leaf springs 44 located on the outer periphery 43 form conductive parts 45. The conductive parts 45 also serve as the outer periphery 43.

[0056] The timepiece 62 comprises a case 52, a first member 63, a guide frame 47, and a movement 48. In the Z direction, the first member 63 has a second protrusion 63a at a location facing the conductive portion 45. The second protrusion 63a comes into contact with the leaf spring 44, which is the conductive portion 45 of the outer circumferential portion 43, and provides electrical conduction.

[0057] With this configuration, the leaf spring 44, which is the conductive portion 45 of the outer peripheral portion 43, comes into contact with the second protrusion 63a. Without the second protrusion 63a, there is a possibility that the leaf spring 44 and the first member 63 will come into point contact when the leaf spring 44 twists. By providing the second protrusion 63a, it is possible to ensure a sufficient contact area between the first member 63 and the conductive portion 45 of the outer peripheral portion 43. This prevents poor contact between the first member 63 and the dial 39.

[0058] The case 52 and the first member 63 are connected via a third packing 54. The dial 39 is fixed between the first member 63 and the movement 48. A first leaf spring 55 is disposed between the case 52 and the first member 63.

[0059] Current 27 due to static electricity entering dial 39 passes through substrate 41, leaf spring 44, second protrusion 63a, first member 63, first leaf spring 55, case 52, and back cover 17 and enters human body 26. Therefore, current 27 due to static electricity does not flow through circuit board 15, and timepiece 62 is static-resistant.

[0060] Seventh embodiment This embodiment differs from the sixth embodiment in that the first member 63 does not have the second protrusion 63a and has a different shape of the leaf spring 44. Note that the same components as those in the sixth embodiment are denoted by the same reference numerals, and redundant explanations will be omitted.

[0061] As shown in FIG. 12 , a timepiece 66 has a dial 67. The dial 67 has a substrate 41. The dial 67 has a central portion 42 and an outer peripheral portion 43. The central portion 42 is on the substrate 41 in a plan view. The outer peripheral portion 43 is outside the outer periphery of the substrate 41. A coating film 23 is disposed on a first surface 41 a of the substrate 41.

[0062] Four leaf springs 68 are fixed by spot welding to the second surface 41b of the substrate 41. In a plan view of the dial 67, the positions of the leaf springs 68 are the same as the leaf springs 44 of the third embodiment. The leaf springs 68 located on the outer periphery 43 are conductive portions 69. The conductive portions 69 also serve as the outer periphery 43. The leaf springs 68 are bent at approximately a right angle in the middle of the outer periphery 43, and the end faces 68a of the tips of the leaf springs 68 face in the positive Z direction.

[0063] The timepiece 66 comprises a case 52, a first member 71, a guide frame 47, and a movement 48. The leaf spring 68 biases the first member 71 at its tip end face 68a. The tip end face 68a of the leaf spring 68 is pressed against the first member 71, ensuring electrical continuity between the leaf spring 68 and the first member 71. It is preferable to place a metal film 25 on the tip end face 68a, which can reduce contact resistance.

[0064] Current 27 due to static electricity entering dial 67 passes through substrate 41, leaf spring 68, first member 71, first leaf spring 55, case 52, and back cover 17 before entering human body 26. Therefore, current 27 due to static electricity does not flow through circuit board 15, and timepiece 66 is static-resistant.

[0065] Eighth embodiment This embodiment differs from the seventh embodiment in the shape of the leaf spring 68. The same components as those in the seventh embodiment are denoted by the same reference numerals, and redundant explanations will be omitted.

[0066] As shown in Figure 13, a timepiece 74 has a dial 75. The dial 75 has a substrate 41. Four leaf springs 76 are fixed to the second surface 41b of the substrate 41 by spot welding. In a plan view of the dial 75, the positions of the leaf springs 76 are the same as the leaf springs 44 of the third embodiment. The leaf springs 76 located on the outer periphery 43 are conductive parts 77. The conductive parts 77 also serve as the outer periphery 43. The leaf springs 76 are bent at an angle exceeding a right angle in the middle of the outer periphery 43, and the tips 76a of the leaf springs 76 face in the positive Z direction and toward the center part 42.

[0067] The timepiece 74 comprises a case 52, a first member 78, a guide frame 47, and a movement 48. The tip 76a of the leaf spring 76 biases the first member 78. Because the tip 76a of the leaf spring 76 is pressed against the first member 78, electrical continuity between the leaf spring 76 and the first member 78 is ensured. It is preferable to place a metal film 25 on the tip 76a, which can reduce contact resistance.

[0068] Current 27 due to static electricity that enters dial 75 passes through substrate 41, leaf spring 76, first member 78, first leaf spring 55, case 52, and back cover 17 and then enters human body 26. Therefore, current 27 due to static electricity does not flow through circuit board 15, and timepiece 74 is static-resistant.

[0069] The leaf spring 76 of this embodiment can have a longer spring length than the leaf spring 68 of the seventh embodiment, and therefore the displacement of the leaf spring 76 can be increased.

[0070] Ninth embodiment This embodiment differs from the sixth embodiment in that the leaf spring 44 is electrically connected to the case. Note that the same components as those in the sixth embodiment are given the same reference numerals, and redundant explanations will be omitted.

[0071] As shown in Figure 14, a timepiece 81 is equipped with a dial 39 of the sixth embodiment. In the dial 39, four leaf springs 44 are fixed by spot welding to the second surface 41b of the substrate 41. The leaf springs 44 form conductive parts 45 on the outer periphery 43.

[0072] A timepiece 81 comprises a case 82, the first member 71 of the seventh embodiment, a guide frame 47, and a movement 48. A conductive portion 45 provides electrical continuity between the outer circumferential portion 43 and the case 82.

[0073] According to this configuration, the conductive portion 45 provides electrical continuity between the outer peripheral portion 43 and the case 82. As a result, electrical continuity between the outer peripheral portion 43 and the case 82 can be ensured.

[0074] In the drawing, in the positive X direction, case 82 has first protrusion 82a at a location facing conductive portion 45. First protrusion 82a comes into contact with leaf spring 44, which is conductive portion 45 of outer circumferential portion 43, to establish electrical continuity.

[0075] According to this configuration, outer peripheral portion 43 comes into contact with first protrusion 82a of case 82. By providing first protrusion 82a, the contact area between case 82 and conductive portion 45 of outer peripheral portion 43 can be secured.

[0076] Current 27 due to static electricity entering dial 39 passes through substrate 41, leaf spring 44, first protrusion 82a, case 82, and back cover 17 and enters human body 26. Therefore, current 27 due to static electricity does not flow through circuit board 15, and timepiece 81 is static-resistant.

[0077] Tenth embodiment This embodiment differs from the ninth embodiment in that the first protrusion 82a is not provided on the case. Note that the same components as those in the ninth embodiment are denoted by the same reference numerals, and redundant explanations will be omitted.

[0078] As shown in Figure 15, a timepiece 85 is equipped with a dial 39 of the sixth embodiment. In the dial 39, four leaf springs 44 are fixed by spot welding to the second surface 41b of the substrate 41. The leaf springs 44 form conductive parts 45 on the outer periphery 43.

[0079] A timepiece 85 includes the case 52 of the fifth embodiment, the first member 71, the guide frame 47, and the movement 48 of the seventh embodiment. A leaf spring 44, which is a conductive part 45, presses against the inner wall 52a of the case 52. The conductive part 45 provides electrical continuity between the outer circumferential part 43 and the case 52. In this embodiment, the case 52 does not include the first protrusion 82a of the ninth embodiment.

[0080] According to this configuration, electrical continuity is established between the conductive portion 45 of the outer peripheral portion 43 and the case 52. As a result, electrical continuity between the outer peripheral portion 43 and the case 52 can be ensured.

[0081] The current 27 due to static electricity that enters the dial 39 passes through the circuit board 41, the leaf spring 44, the case 52, and the back cover 17 and enters the human body 26. Therefore, the current 27 due to static electricity does not flow through the circuit board 15, and the timepiece 85 is static-resistant.

[0082] Eleventh embodiment This embodiment differs from the fourth embodiment in that the side of the dial substrate contacts the case 52. Note that the same components as those in the fourth embodiment are given the same reference numerals, and redundant explanations will be omitted.

[0083] As shown in Figure 16, a timepiece 88 has a dial 89 and a first member 90. The dial 89 has a base plate 91. The outer diameter of the base plate 91 is larger than the base plate 19 of the fourth embodiment. The base plate 91 has a first surface 91a facing the crystal plate 2, on which a paint film 23 is formed. A second surface 91b of the base plate 91 opposite the first surface 91a comes into contact with the movement 9.

[0084] A plated metal film 92 is provided on a side surface 91c of the substrate 91. The metal film 92 is a conductive portion 93. In a plan view of the dial 89, the portion where the paint film 23 is arranged is a central portion 94. In a plan view of the dial 89, the portion where the metal film 92, which is the conductive portion 93, is arranged is an outer periphery 95.

[0085] A timepiece 88 comprises a case 52, a first member 90, a dial 89, a guide frame 16, and a movement 9. The dial 89 fits into the inner wall 52a of the case 52. A metal film 92, which is a conductive portion 93, presses against the inner wall 52a of the case 52. The conductive portion 93 provides electrical continuity between an outer periphery 95 and the case 52.

[0086] According to this configuration, electrical continuity is established between the conductive portion 93 of the outer peripheral portion 95 and the case 52. As a result, electrical continuity between the outer peripheral portion 95 and the case 52 can be ensured.

[0087] Current 27 due to static electricity entering dial 89 passes through substrate 91, metal film 92, case 52, and back cover 17 into human body 26. Therefore, current 27 due to static electricity does not flow through circuit board 15, and timepiece 88 is static-resistant.

[0088] Twelfth embodiment This embodiment differs from the first embodiment in that a substrate made of a resin material is used instead of a metal substrate 19. As shown in FIG. 17, a dial 98 includes a substrate 99. The substrate 99 is made of a non-conductive material. The material of the substrate 99 is not particularly limited, but various resin materials, ceramic, glass, etc. can be used. In this embodiment, the material of the substrate 99 is, for example, polycarbonate.

[0089] The surface of the substrate 99 facing the positive Z direction is the first surface 99a. The surface opposite the first surface 99a is the second surface 99b. The substrate 99 has a first metal film 101, which is a conductive member, on the first surface 99a. The first metal film 101 can be formed by electroless plating, sputtering, vapor deposition, or the like. The substrate 99 may also have the first metal film 101 on the second surface 99b and the side surface 99c. The material of the first metal film 101 is not particularly limited, but in this embodiment, for example, the material of the first metal film 101 is nickel.

[0090] The dial 98 has a central portion 102 and an outer peripheral portion 103. The central portion 102 is located in the center of the first surface 99a of the substrate 99 in a plan view. The outer peripheral portion 103 is located on the outer periphery of the central portion 102. The dial 98 has a paint film 23 on the central portion 102. The dial 98 does not have a paint film 23 on the outer peripheral portion 103, but has a metal film 25. The metal film 25 is formed by plating. The outer peripheral portion 103 is conductive with the first metal film 101 and has a conductive metal film 25 on its surface. The surface of the central portion 102 is non-conductive.

[0091] The dial 98 can be applied to the dials 5 of the first, second, fourth and fifth embodiments. In this case, the first metal film 101 may also be provided on the second surface 99b and the side surface 99c of the substrate 99.

[0092] By providing the first metal film 101 on the second surface 99b of the substrate 99, the substrate 99 can be used as the dial 39 of the third embodiment. In addition, the dial 98 having the first metal film 101 provided on the second surface 99b can be used as the dial 39 of the sixth, ninth, and tenth embodiments. The dial 98 having the first metal film 101 provided on the second surface 99b can be used as the dial 67 of the seventh embodiment and the dial 75 of the eighth embodiment.

[0093] When the substrate 99 is applied to the dial 39 of the third, sixth, ninth and tenth embodiments, the leaf spring 44 is adhesively fixed to the substrate 99. When the substrate 99 is applied to the dial 67 of the seventh embodiment, the leaf spring 44 is adhesively fixed to the substrate 99. When the substrate 99 is applied to the dial 75 of the eighth embodiment, the leaf spring 76 is adhesively fixed to the substrate 99.

[0094] By providing the first metal film 101 on the first surface 99a and side surface 99c of the substrate 99, the substrate 99 can be used as the dial 89 of the eleventh embodiment. In this case, the first metal film 101 may also be provided on the second surface 99b and side surface 99c of the substrate 99. Note that in all embodiments, the first metal film 101 may also be provided on the first surface 99a, the second surface 99b, and the side surface 99c of the substrate 99. In other words, the first metal film 101 may be provided on all surfaces surrounding the substrate 99.

[0095] Thirteenth embodiment In the first embodiment, the motor 13 of the timepiece 1 rotates using energy from the battery 11. The rotation of the motor 13 rotates the hour hand 6, minute hand 7, and second hand 8. The structures of the first to twelfth embodiments can also be applied to light-powered timepieces, radio-controlled timepieces, satellite-waved timepieces, Spring Drive timepieces which are electronically controlled mechanical timepieces, and Kinetic timepieces which generate power by rotating an oscillating weight. In this case, too, the same effects as those of the above embodiments can be obtained. The dial of a light-powered timepiece may use a substrate in which a metal plate and a resin plate are laminated. A hole to allow light to pass through may be provided in the center 21 of the metal plate.

[0096] Fourteenth embodiment In the third embodiment, four conductive portions 45, that is, leaf springs 44, are mounted on the substrate 41. The number of leaf springs 44 mounted on the substrate 41 is not limited to four. The number of leaf springs 44 mounted on the substrate 41 may be one to three, or may be four or more. When the number of leaf springs 44 is small, the dial 39 can be manufactured with good productivity. When the number of leaf springs 44 is large, the number of contact points between the leaf springs 44 and the case 46 is large. Therefore, electrical continuity between the leaf springs 44 and the case 46 can be reliably established. The same can be said for the sixth to tenth embodiments.

[0097] Fifteenth embodiment The timepieces of the seventh to eleventh embodiments were equipped with a case and a first member. Even if the case 3 does not include the first member as in the first embodiment, the outer periphery may be electrically connected to the case 3 as in the seventh to eleventh embodiments.

[0098] Sixteenth embodiment In the first embodiment, there were no subdials on the dial 5. When there are subdials in the center portion 21 of the dial 5, the paint film 23 does not need to be present on the subdial portion. This allows the dial 5 to have a highly aesthetically pleasing appearance.

[0099] Seventeenth embodiment In the third embodiment, the leaf spring 44 and the first protrusion 46a came into contact. In the first embodiment, the metal film 25 of the dial 5 and the first protrusion 46a may also come into contact. In the sixth embodiment, the leaf spring 44 and the second protrusion 63a came into contact. In the fourth embodiment, the metal film 25 of the dial 5 and the second protrusion 63a may also come into contact. In this case, the contact area can be secured. [Explanation of symbols]

[0100] 1,31,38,51,58,62,66,74,81,85,88...watch, 3,32,46,52,82...case, 5,39,67,75,89,98...dial, 17...back cover, 21...center, 22...periphery, 23...painted film, 25,92...metal film, 33,45,69,77,93...conductive part, 46a,82a...first convex part, 53,59,63,71,78,90...first member, 63a...second convex part.

Claims

1. A conductive substrate is provided, and a non-conductive central portion is provided on the surface of the substrate in a plan view. and a conductive outer periphery provided on the outer periphery of the central portion and on the surface of the base material. A board and a conductive case that is electrically connected to the outer periphery and to a conductive back cover; A watch characterized by comprising:

2. 2. A timepiece according to claim 1, A timepiece characterized by having a conductive part that provides electrical continuity between the outer periphery and the case.

3. A timepiece according to claim 1 or 2, The case has a first protrusion that protrudes toward the back cover and is electrically connected to the outer periphery. A clock that does this.

4. 2. A timepiece according to claim 1, a first member electrically connected to the outer circumferential portion; A timepiece characterized in that the first member is electrically connected to the case.

5. 5. A timepiece according to claim 4, The present invention is characterized in that the outer circumferential portion and the first member are electrically connected to each other. Total.

6. A timepiece according to claim 4 or 5, The first member has a second protrusion that protrudes toward the back cover and is electrically connected to the outer periphery. A clock that does this.

7. A timepiece according to claim 2 or 5, A watch characterized in that the conductive part has elasticity.

8. A timepiece according to any one of claims 1 to 7, The non-conductive central portion of the dial is realized by a paint film. A clock.

9. A timepiece according to any one of claims 1 to 8, A watch characterized in that the outer periphery is provided with a metal film.

10. A timepiece according to any one of claims 1 to 9, The static electricity entering the dial is conducted between the base material, the outer periphery, and the outer periphery of the dial. A watch characterized in that the water flows through the case and into the back cover.

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