JP2008058120A - Dial and molding die therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dial having a dial body hard to be cracked even if a large number of nicking grooves are formed on one surface of the dial body which is made up by bringing a resin to flow from the center part toward the peripheral part. <P>SOLUTION: The dial body 10 is made up by bringing the resin to flow radially from the center part toward the peripheral part, and the large number of nicking grooves 16 are formed radially on the upper surface of the dial body 10 except the vicinity 14 of the center part and the peripheral part 15. Since the nicking grooves 16 are not formed on the vicinity 14 of the center part and the peripheral part 15 of the dial body 10, any crack is prevented from occurring along the radial nicking grooves 16 at the vicinity 14 of the center part and the peripheral part 15 of the dial body 10, even if the arrangement direction of molecules of the resin being arranged radially coincides with that of the large number of nicking grooves 16 formed on the upper surface of the dial body 10. The dial body 10 is thereby made hard to be cracked. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a dial plate used for a display device such as a clock or an instrument, and a molding die for the dial plate.

Conventionally, a dial of a wristwatch is formed by forming a dial main body into a thin plate by injection-molding the dial main body with a transparent resin, and on the surface of the dial main body, there are a number of designs for improving design. There is one in which the weight groove is formed in a straight line.
JP2003-110129A

  Since such a dial has a thin dial body, the dial body is warped during injection molding. In order to prevent this, when injection molding the dial main body, a gate is provided at the center of the molding die corresponding to the center of the dial main body, and resin is injected into the molding die from this gate, The resin molecules are radially arranged from the central portion in the molding die toward the outer peripheral side in the molding die to form the resin molecules in a radial arrangement.

  However, in such a conventional dial, the dial body is formed in a state in which resin molecules are radially arranged by the resin flowing radially from the center of the dial body toward the outer periphery. Therefore, when a large number of weighting grooves for improving the design are formed on the surface of the dial body in a straight line, resin molecules in which a part of the plurality of weighting grooves formed in a straight line are arranged radially. Matches the direction of the array. For this reason, there is a problem that the dial main body is likely to crack along the straight line portion where the basis groove and the resin molecule arrangement direction coincide with each other, and the dial main body is easily broken.

  The problem to be solved by the present invention is that even if a dial plate body is formed by flowing resin from the central portion toward the outer peripheral side and a plurality of weighting grooves are formed linearly on one surface of the dial plate body, It is an object of the present invention to provide a dial plate and a molding die for the dial plate that are difficult to break.

In order to solve the above problems, the present invention includes the following components.
In addition, the reference numerals of the drawings attached to the respective elements described in the section of each embodiment described later are attached to the respective constituent elements together with parentheses.

As shown in FIGS. 1 to 13, 29, and 30, the invention according to claim 1 forms the dial body (10) by flowing resin radially from the central portion toward the outer peripheral portion. On the dial,
Except for the vicinity of the central portion (near the central portion 14, 82) and the outer peripheral portion (15, 83) on the front and back surfaces of the dial main body, a number of weight grooves (16, 81) are linearly formed. The dial is characterized by being formed.

  As shown in FIGS. 1 to 7, 29, and 30, the center of the dial body (10) in which the weight groove (16, 81) is formed is the center of the dial body (10). 2. The dial according to claim 1, wherein the surface in the vicinity of the portion (14, 82) and the surface of the outer peripheral portion (15, 83) are each formed on a flat surface.

  As shown in FIGS. 1 to 9, 29, and 30, the invention described in claim 3 includes the vicinity of the central portion (14, 82) and the outer peripheral portion (on the one surface of the dial body (10)). 15. The dial according to claim 2, wherein each of the flat surfaces (15, 83) is formed one step lower than a portion where the weights (16, 81) are formed.

  In the invention according to claim 4, as shown in FIGS. 12 and 13, the flat surfaces of the vicinity of the central portion (14) and the outer peripheral portion (15) on the one surface of the dial main body (10) are provided. The dial according to claim 2, wherein the dial is formed one step higher than a portion where the weighting groove (16) is formed.

  As shown in FIG. 10 and FIG. 11, the invention according to claim 5 includes the flat surface in the vicinity of the central portion (14) of the dial body (10) and the flat surface of the outer peripheral portion (15). A plurality of circular grooves (cross grooves 31 and 32) centering on the central portion of the dial body corresponding to the portion where the resin is injected are formed concentrically on at least one flat surface. The dial according to any one of claims 1 to 4, wherein the dial is provided.

  The invention according to claim 6 is, as shown in FIGS. 12 and 13, near the central portion of the dial body (10) formed one step higher than the portion where the weighting groove (16) is formed. A plurality of continuous grooves (36) corresponding to the plurality of weighting grooves are formed on at least one of the flat surface of (14) and the flat surface of the outer peripheral portion (15). The dial according to claim 4.

As shown in FIGS. 14 to 19, the invention described in claim 7 is a dial in which the dial main body (10) is formed by flowing resin radially from the center portion toward the outer peripheral portion.
The dial is characterized in that a large number of weight grooves (41, 46) are formed in a discontinuous state on one surface of the front and back of the dial body.

As shown in FIGS. 20 to 23, the invention according to claim 8 is a dial in which the dial main body (10) is formed by flowing resin radially from the central portion toward the outer peripheral portion.
A plurality of weighting grooves (51) are formed in a straight line on one surface of the dial body, and a sheet member (decorative sheets 52, 56 is provided on one of the one surface of the dial body and the other surface facing the groove. ) Is attached to the dial.

The invention according to claim 9 is a dial in which the dial body (10) is formed by flowing resin radially from the center portion toward the outer peripheral portion as shown in FIGS.
A number of weighting grooves (62) are formed linearly on one surface of the dial body, and the dial body is molded in the vicinity of the central portion of the dial body where the resin is injected. The dial is characterized in that it is provided with a recess (concave groove 61) for sometimes disturbing the resin flow and turbulent flow of the resin.

  As shown in FIGS. 27 and 28, the invention described in claim 10 is characterized in that an insert member (71) is provided in the recess (concave groove 61). It is a board.

The invention according to claim 11 corresponds to a cavity (64) formed in the same shape as the dial body (10) and a central portion of the dial body in the cavity, as shown in FIGS. A gate (65) provided at a location to be injected, resin is injected from the gate into the cavity, and the resin is caused to flow radially from the center to the outer peripheral side of the cavity. A mold for molding,
An obstruction (protrusion 67, insert member 71) is provided in the vicinity of the central portion of the cavity where the gate is provided to obstruct the flow of the resin and turbulent the resin. This is a molding die.

  The invention according to a twelfth aspect is characterized in that, as shown in FIGS. 24 to 26, the blocking portion is a protrusion (67) integrally formed on the inner surface of the cavity (64). 11 is a molding die.

  As shown in FIGS. 27 and 28, the invention described in claim 13 is the insert member (71) arranged on the inner surface of the cavity (64) as shown in FIGS. 27 and 28. The molding die as described.

  According to a fourteenth aspect of the present invention, as shown in FIGS. 24 to 28, a plurality of weight forming grooves (66) are linearly formed on the inner surface of the cavity (64). The dial according to any one of Items 11 to 13.

  According to the invention described in claim 1, in the dial plate in which the dial main body is formed by flowing resin radially from the central portion toward the outer peripheral portion, the central portion of the dial main body is provided on one surface of the dial main body. Except for the vicinity and the outer periphery, a large number of weighting grooves are formed in a straight line, so that the alignment direction of the resin molecules arranged radially and the straight weighting grooves formed on one surface of the dial body are provided. Even if a part of the dial body matches, the center of the dial body is aligned along the weighting groove that matches the arrangement direction of the resin molecules, because the weighting groove is not formed in the vicinity of the center part of the dial body and the outer peripheral part. It can suppress that a crack generate | occur | produces in a part vicinity and an outer peripheral part, and, thereby, can make a dial main body hard to break.

  According to the second aspect of the present invention, the surface near the central portion and the surface of the outer peripheral portion on one surface of the dial main body in which the weight grooves are formed are respectively formed on a flat surface, whereby the dial main body Since the surfaces near the center and the outer periphery of the plate are flat surfaces with no weighting grooves formed, the alignment direction of the resin molecules arranged radially and the linear shape formed on one surface of the dial body Even if a part of the weight of the dial is coincident, it is possible to prevent cracks from occurring in the vicinity of the central portion and the outer periphery of the dial body along the matched weight of the dial. Can be made difficult to break.

  According to the third aspect of the present invention, even if the vicinity of the central portion, the outer peripheral portion, and each flat surface on one surface of the dial main body are formed one step lower than the portion where the weighting grooves are formed, the dial main body In the vicinity of the center portion and the outer peripheral portion, there are no weighting grooves formed, so that the arrangement direction of the resin molecules arranged radially and a part of the straight weighting grooves formed on one surface of the dial body Can be prevented from generating cracks in the vicinity of the central portion of the dial main body and at the outer peripheral portion along the matched weighting groove, thereby making it difficult to break the dial main body. .

  According to the fourth aspect of the present invention, the vicinity of the central portion, the outer peripheral portion, and each flat surface on one surface of the dial main body are formed one step higher than the portion where the weight grooves are formed. Not only is the weighting groove formed in the central part of the main body and the outer peripheral part, but the thickness of the vicinity of the central part and the outer peripheral part is thicker than the part of the weighting groove. The strength with the part can be increased. For this reason, even if the arrangement direction of the resin molecules arranged radially and a part of the linear weight groove formed on one surface of the dial main body coincide with each other, the characters are aligned along the matching weight grooves. It is possible to reliably prevent cracks from occurring in the vicinity of the center portion and the outer peripheral portion of the plate main body, and to make the dial plate main body more difficult to break.

  According to the invention described in claim 5, the dial main body corresponding to the location where the resin is injected into at least one of the flat surface near the center of the dial main body and the flat surface of the outer peripheral portion. A plurality of circular grooves formed on one of the flat surfaces near the center and the outer periphery of the dial main body by concentrically forming a plurality of circular grooves centered on the center. And a large number of straightening grooves formed on one surface of the dial main body, the crack generation direction can be changed between a plurality of circular grooves and a linear weighting groove. It is possible to reliably prevent the occurrence of cracks in the direction along the straight perforated grooves in the vicinity of the central portion and the outer peripheral portion of the dial main body in which a plurality of circular grooves are formed. The main body can be made difficult to break.

  According to the sixth aspect of the present invention, at least one of the flat surface in the vicinity of the center portion of the dial main body and the flat surface of the outer peripheral portion formed one step higher than the portion in which the weight grooves are formed is flat. By forming a large number of continuous grooves corresponding to a large number of weighting grooves on the surface, the thickness of the vicinity of the central portion of the dial main body and the outer peripheral portion is thicker than the portion where the weighting grooves are formed. Similar to the described invention, the strength of the dial body in the vicinity of the central portion and the outer peripheral portion can be increased, so that a large number of continuous grooves can be associated with a large number of weighting grooves in the vicinity of the central portion and the outer peripheral portion. Even if it is formed, it is possible to suppress the occurrence of cracks in the direction along the straight weighting grooves that coincide with the alignment direction of the resin molecules in the vicinity of the center portion and the outer peripheral portion of the dial body. The main body can be made difficult to break.

  According to the invention described in claim 7, in the dial plate in which the dial main body is formed by flowing resin radially from the central portion toward the outer peripheral portion, a large number of weights are formed on one surface of the dial main body. Since the grooves are formed in a straight line in a discontinuous state, even if the arrangement direction of the resin molecules arranged in a radial pattern coincides with a part of the straight weight grooves, the straight weight grooves continue. Therefore, it is possible to suppress the occurrence of continuous cracks in the dial main body along the weighted grooves, and thus the dial main body can be made difficult to break.

  According to the invention described in claim 8, in the dial plate in which the dial plate body is formed by flowing resin radially from the center portion toward the outer peripheral portion, a large number of weight grooves are formed on one surface of the dial body. Is formed in a straight line, and a sheet member is attached to one side of the dial main body and the other surface opposite to the dial body. Therefore, the arrangement direction of the resin molecules arranged in a radial direction and a large number of linear weights Even if a part of the groove matches, the sheet member pasted on the dial plate causes a crack in the dial plate along the straight fabric groove that matches the resin molecule arrangement direction. Therefore, it is possible to make the dial body difficult to break.

  According to the invention described in claim 9, in the dial plate in which the dial main body is formed by flowing resin radially from the center portion toward the outer peripheral portion, a large number of weight grooves are formed on one surface of the dial main body. In the vicinity of the central portion of the location where the resin is injected in the dial main body, a recess for preventing the resin flow at the time of molding the dial main body and making the resin turbulent is provided. When molding the dial body by flowing the resin from the center to the outer periphery, the resin is turbulently arranged by the recess provided near the center of the dial body, and the resin molecules are irregularly arranged. Can be made. For this reason, even if a large number of weight grooves are formed on the front and back surfaces of the dial main body, it is possible to prevent the linear weight grooves from aligning with the resin molecules. Since it can suppress that a crack generate | occur | produces in a dial main body along a linear weighting groove | channel, a dial main body can be made hard to break.

  According to the invention described in claim 10, since the insert member is provided in the recess, the resin can be turbulent by the insert member and the resin molecules can be irregularly arranged. As in the invention described in, since it is possible to prevent the alignment direction of the linear weighting grooves and the resin molecules from being aligned, it is possible to suppress the occurrence of cracks in the dial body along the straight weighting grooves. In addition, since the strength of the dial main body at the location corresponding to the recess can be increased by the insert member, the dial main body can be made more difficult to break.

  According to the eleventh aspect of the present invention, there is provided a cavity formed in the same shape as the dial main body, and a gate provided at a location corresponding to the central portion of the dial main body in the cavity. A molding die for molding the dial main body by pouring resin into the cavity and flowing the resin radially from the center of the cavity toward the outer periphery, in the vicinity of the center of the cavity where the gate is provided In addition, since the obstruction part for disturbing the resin flow is provided, the resin is caused to flow by the obstruction part when molding the dial body by flowing the resin from the central part of the cavity toward the outer peripheral side. The molecules of the resin can be arranged irregularly by turbulent flow. For this reason, it can suppress that a crack generate | occur | produces in a dial main body linearly, and, thereby, the dial main body which cannot be broken easily can be shape | molded.

  According to the twelfth aspect of the present invention, since the obstructing portion is a protrusion integrally formed on the inner surface of the cavity, the obstructing portion can be easily provided on the inner surface of the cavity, and the resin can be formed by the protrusion. Since the resin molecules can be irregularly arranged by turbulent flow, cracks can be prevented from occurring linearly in the dial body, thereby making it possible to form a dial body that is difficult to break. .

  According to the thirteenth aspect of the present invention, since the obstructing portion is an insert member disposed on the inner surface of the cavity, the obstructing portion can be easily provided on the inner surface of the cavity, and at the center of the dial body. Since the resin can be turbulent and the resin molecules can be irregularly arranged by the insert member provided in the vicinity, cracks can be prevented from being generated linearly in the dial body, and the insert member Since the strength of the dial body can be increased, a dial body that is more difficult to break can be formed.

  According to the invention described in claim 14, the dial main body is formed by flowing resin from the central portion of the cavity toward the outer peripheral side by forming a large number of weight forming grooves on the inner surface of the cavity. When doing so, a large number of weighting grooves can be formed linearly on one surface of the dial body. Thus, even if a large number of weighting grooves are formed linearly on one surface of the dial main body, the resin molecules are irregularly arranged, so the linear weighting grooves and the alignment direction of the resin molecules are different. It is possible to prevent the occurrence of matching, and thereby it is possible to suppress the occurrence of cracks linearly in the dial plate body along the weighting grooves, and thus it is possible to form a dial plate body that is difficult to break.

(Embodiment 1)
A first embodiment in which the dial of the present invention is applied to a wristwatch will be described below with reference to FIGS.
1 is an enlarged cross-sectional view of the main part showing the wristwatch of the present invention, FIG. 2 is a front view of the dial, FIG. 3 is a cross-sectional view of the dial of FIG. 2, and (a) is an AA of FIG. The expanded sectional view in an arrow view, (b) is an expanded sectional view in the BB arrow view of FIG.
As shown in FIG. 1, the wristwatch includes a wristwatch case 1. A watch glass 2 is attached to the upper part of the watch case 1 via a packing 3.

  Inside the watch case 1, a timepiece module 5 is arranged corresponding to the timepiece glass 2 via a parting part 4. As shown in FIG. 1, the parting member 4 is disposed along the inner peripheral surface of the watch case 1 in a state of being positioned between the watch glass 2 and the watch module 5. Further, the timepiece module 5 includes a housing 6 as shown in FIG. A dial plate 8 is provided on the upper surface of the housing 6 via a solar panel 7. The dial 8 has light transparency and is configured to transmit external light and irradiate the solar panel 7. The outer peripheral portion of the dial 8 is pressed against the housing 6 via the solar panel 7 by the lower surface of the parting member 4 disposed on the inner peripheral surface of the watch case 1.

  Further, the housing 6 is provided with a timepiece movement (not shown) as shown in FIG. In this timepiece movement, the pointer shaft 11 is inserted into the shaft insertion hole 9 provided in the dial plate 8 and the solar panel 7 from the lower side and protrudes above the dial plate 8. Is attached, and the pointer 12 moves the dial 8 above to indicate the time.

  In this case, as shown in FIG. 1, the pointer shaft 11 includes a cylindrical hour hand shaft 11a and a cylindrical minute hand that is rotatably inserted into the hour hand shaft 11a and has an upper end protruding above the hour hand shaft 11a. The shaft 11b includes a second hand shaft 11c that is rotatably inserted into the minute hand shaft 11b and has an upper end protruding above the minute hand shaft 11b. The pointer 12 includes an hour hand 12a having a flange portion 13a attached to the upper end portion of the cylindrical hour hand shaft 11a, a minute hand 12b having a flange portion 13b attached to the upper end portion of the cylindrical minute hand shaft 11b, and a second hand shaft 11c. And a second hand 12c having a flange portion 13c attached to the upper end portion.

  On the other hand, the dial 8 is made of a transparent synthetic resin such as polycarbonate (PC), and includes a dial main body 10 formed in a disc shape having a thickness of about 0.3 mm as shown in FIGS. ing. A shaft insertion hole 9 is provided at the center of the dial body 10. Further, as shown in FIGS. 2 and 3, a large number of portions on the upper surface of the dial main body 10 are provided except for the vicinity of the central portion 14 located around the shaft insertion hole 9 and the outer peripheral portion 15 of the dial main body 10. Are formed in a radial pattern. In this case, the vicinity 14 of the central portion of the dial main body 10 is arranged corresponding to the lower side of the flange portions 13a to 13c of the pointer 12, as shown in FIG. Are arranged corresponding to the lower side of the parting member 4.

  Further, the upper surfaces of the central portion 14 and the outer peripheral portion 15 of the dial main body 10 are respectively formed as flat surfaces as shown in FIGS. 3 (a) and 3 (b). The large number of radial grooves 16 are for improving the design of the dial 8, and as shown in FIGS. 3 (a) and 3 (b), the bottom of each valley is in the vicinity of the central portion 14 and the outer periphery. A state in which the crests between adjacent weights 16 are formed at the same height as each flat surface of the portion 15 and protrude slightly above the flat surfaces of the dial 14 in the vicinity of the center portion 14 and the outer peripheral portion 15. It is formed with.

Next, with reference to FIGS. 4-6, the case where this dial main body 10 is formed with the metal mold | die 17 for shaping | molding is demonstrated.
As shown in FIG. 4, the molding die 17 includes an upper die 17a and a lower die 17b. A concave portion having the same shape as the dial plate body 10 is formed on the lower surface of the upper die 17a. Is closed by the upper surface of the lower mold 17b, so that a cavity 18 which is a cavity having the same shape as the dial body 10 is formed in the upper mold 17a and the lower mold 17b.

  As shown in FIG. 4, the upper mold 17 a has a gate 19 at a location corresponding to the center of the dial main body 10 in the cavity 18, that is, a location corresponding to the center of the shaft insertion hole 9 of the dial main body 10. Are provided on the inner surface of the upper mold 17a corresponding to the upper surface of the cavity 18 and the vicinity 14 of the central portion located around the shaft insertion hole 9 in the dial main body 10 and the outer peripheral portion 15 of the dial main body 10. Except for the portions corresponding to, a large number of weight forming grooves 20 are formed radially.

  When the dial 8 is molded with the molding die 17, polycarbonate (PC) or the like is placed in the cavity 18 from the gate 19 of the upper die 17a with the upper die 17a and the lower die 17b overlapped. Inject resin. Then, the injected resin flows radially from the center in the cavity 18 toward the outer peripheral side, as indicated by arrows in FIG. As a result, a molded product 21 to be the dial body 10 is formed in the cavity 18. The molded product 21 is formed in a state in which resin molecules 22 are radially arranged as shown in FIG. 6 by the resin flowing radially from the center in the cavity 18 toward the outer peripheral side.

  Further, at this time, a large number of weight forming grooves 20 formed radially on the inner surface of the upper mold 17a are formed on the upper surface of the molded product 21 on the vicinity of the central portion 14 and the outer peripheral portion 15 as shown in FIG. Except for the corresponding portions, a large number of weight grooves 16 are formed radially. Thereafter, the upper mold 17a and the lower mold 17b are separated from each other, the molded product 21 is taken out, the gate is removed from the center of the molded product 21, and the shaft insertion hole 9 is formed. Thereby, the dial 8 shown in FIGS. 2 and 3 is formed.

  Thus, according to the dial 8, the dial main body 10 is formed by flowing the resin radially from the central portion to the outer peripheral portion in the cavity 18 of the molding die 17. The dial main body 10 is not warped, and the dial main body can be formed flat. In addition, a large number of weighting grooves 16 for improving the design are formed on the upper surface of the dial plate body 10 except for the vicinity of the central portion 14 and the outer peripheral portion 15. Even if the alignment grooves 16 are aligned with the arrangement direction of the resin molecules 22 arranged radially, a large number of alignment grooves 16 are not formed in the vicinity of the central portion 14 and the outer peripheral portion 15 of the dial body 10. Therefore, the occurrence of cracks in the vicinity of the central portion 14 and the outer peripheral portion 15 of the dial main body 10 can be suppressed along the radial weight grooves 16.

  That is, a large number of weighting grooves 16 are not formed in the vicinity 14 of the dial main body 10 and the outer peripheral portion 15, and the upper surface of the dial main body 10 near the central portion 14 and the upper surface of the outer peripheral portion 15 are flat. Therefore, even if the arrangement direction of the resin molecules 22 arranged in the radial direction coincides with a large number of the radially formed weight grooves 16, along the corresponding radial weight grooves 16, It is possible to prevent cracks from occurring near the central portion 14 and the outer peripheral portion 15 of the dial main body 10, thereby making it difficult to crack the dial main body 10.

  In the first embodiment, the case has been described in which the valley bottom portions of the numerous weighting grooves 16 are formed at the same height as the flat surfaces of the central portion 14 and the outer peripheral portion 15 of the dial body 10. For example, as shown in FIG. 7 (a) and FIG. 17 (b), for example, the valley bottoms of the plurality of weighting grooves 16 are flattened around the central portion 14 and the outer peripheral portion 15 of the dial body 10. The crests between the weighting grooves 16 that are lower than the surface and are adjacent to each other may be formed at the same height as the flat surfaces of the vicinity 14 of the dial body 10 and the outer peripheral portion 15. Even if comprised in this way, there exists an effect similar to Embodiment 1. FIG.

(Embodiment 2)
Next, a second embodiment in which the present invention is applied to a dial of a wristwatch will be described with reference to FIGS. In addition, the same code | symbol is attached | subjected and demonstrated to the same part as Embodiment 1 shown by FIGS.
The dial plate 25 has a configuration in which each upper surface of the central portion 14 and the outer peripheral portion 15 of the dial plate body 10 is formed into a flat surface by cutting, and the other configuration is substantially the same as in the first embodiment. .

  That is, the dial 25 is formed with a large number of weighting grooves 16 on the upper surface of the dial main body 10 except for the vicinity of the central portion 14 and the outer peripheral portion 15 in the same manner as in the first embodiment. Each flat surface of the central portion 14 and the outer peripheral portion 15 may be formed by cutting to a flat surface that is one step lower than the portion where the weight grooves 16 are formed, and may be formed over the entire upper surface of the dial body 10. A number of weighting grooves 16 are formed radially, and in this state, the central portion 14 and the outer peripheral portion 15 on the upper surface of the dial main body 10 are cut by a flat work, one level lower than the portion where the weighting grooves 16 are formed. The structure formed in the surface may be sufficient.

  Also in such a dial plate 25, similarly to the first embodiment, the central portion 14 and the outer peripheral portion 15 on the upper surface of the dial main body 10 are cut by one step from the portion where the weight grooves 16 are formed. Even when formed on a flat surface, as in the first embodiment, since the weight grooves 16 are not formed in the vicinity of the central portion 14 and the outer peripheral portion 15 of the dial main body 10, the arrangement of the resin molecules 22 arranged in a radial manner is provided. Even if the direction and the large number of radially formed weight grooves 16 coincide with each other, cracks occur in the central portion 14 and the outer peripheral portion 15 of the dial main body 10 along the corresponding radial weight grooves 16. This can prevent the dial main body 10 from being broken.

(Embodiment 3)
Next, with reference to FIGS. 10 and 11, a third embodiment in which the present invention is applied to a dial of a wristwatch will be described. Also in this case, the same portions as those in the first embodiment shown in FIGS.
The dial 30 is formed by concentrically forming a plurality of circular intersecting grooves 31 and 32 centering on the shaft insertion hole 9 of the dial main body 10 on the upper surfaces of the vicinity 14 and the outer peripheral portion 15 of the dial main body 10. The other configuration is substantially the same as that of the first embodiment.

  That is, the circular intersecting grooves 31 and 32 are circular and centered on the shaft insertion hole 9 of the dial main body 10 on the upper surfaces of the vicinity 14 of the dial main body 10 and the outer peripheral portion 15. A plurality are formed in a shape. As a result, the circular intersecting grooves 31 and 32 are configured to be orthogonal to the large number of weighting grooves 16 formed radially on the upper surface of the dial main body 10 as shown in FIGS. 10 and 11. Yes.

  According to such a dial 30, a plurality of circular shapes centering on the central portion of the shaft insertion hole 9 of the dial main body 10 are provided on the upper surfaces of the vicinity 14 of the central portion 10 and the outer peripheral portion 15 of the dial main body 10. Since the intersecting grooves 31 and 32 are formed concentrically, the circular intersecting grooves 31 and 32 formed on the upper surfaces of the central portion 14 and the outer peripheral portion 15 and the upper surface of the dial main body 10 are radially formed. Since a large number of fabric grooves 16 are orthogonal to each other, the direction of occurrence of cracks can be changed between the circular intersecting grooves 31 and 32 and the radial fabric grooves 16. For this reason, it is possible to prevent cracks from occurring in the vicinity of the central portion 14 and the outer peripheral portion 15 of the dial main body 10 along the radially formed weighting grooves 16, and this also breaks the dial main body 10. Can be difficult.

  In the third embodiment, the case where the circular intersecting grooves 31 and 32 are formed concentrically on the upper surfaces of the vicinity 14 of the dial body 10 and the outer peripheral portion 15 is not limited to this. A configuration in which at least one of the circular intersecting grooves 31 and 32 is formed concentrically on at least one of the upper surfaces of the vicinity 14 of the central portion 10 and the outer peripheral portion 15 of the dial main body 10 may be employed. Even in such a configuration, it is possible to prevent cracks from occurring in the vicinity 14 of the central portion 14 and the outer peripheral portion 15 of the dial main body 10 along the radial weighting grooves 16. be able to.

(Embodiment 4)
Next, a fourth embodiment in which the present invention is applied to a dial of a wristwatch will be described with reference to FIGS. Also in this case, the same portions as those in the first embodiment shown in FIGS.
The dial plate 35 has a configuration in which each thickness t1 of the central portion 14 and the outer peripheral portion 15 of the dial plate body 10 is formed thicker than the thickness t2 of the portion where the weighting groove 16 is formed. The configuration is almost the same as in the first embodiment.

  That is, the central portion 14 and the outer peripheral portion 15 of the dial main body 10 are closer to the central portion of the dial main body 10 than the crests between the adjacent dosing grooves 16 as shown in FIGS. 14 and the outer peripheral portion 15 are formed one step higher, whereby the thickness t1 between the central portion 14 and the outer peripheral portion 15 is formed to be thicker than the thickness t2 of the portion where the weight groove 16 is formed. Yes. On each upper surface of the dial main body 10, a number of continuous grooves 36 corresponding to the number of radial weighting grooves 16 are formed.

  According to such a dial plate 35, each upper surface of the central portion 14 and the outer peripheral portion 15 of the dial main body 10 is formed one step higher than the upper surface of the portion where the weighting groove 16 is formed. Since the thickness t1 between the central portion 14 and the outer peripheral portion 15 can be made thicker than the thickness t2 of the portion where the radial weight grooves 16 are formed, the strength between the central portion 14 and the outer peripheral portion 15 is increased. As a result, cracks can be reliably prevented from occurring in the vicinity of the central portion 14 and the outer peripheral portion 15 of the dial main body 10 along the radial weighting grooves 16. 10 can be made difficult to break.

  As described above, the thickness t1 between the central portion 14 of the dial main body 10 and the outer peripheral portion 15 is formed to be thicker than the thickness t2 of the portion where the weight groove 16 is formed. Since the strength of the vicinity 14 and the outer periphery 15 can be increased, a large number of continuous grooves corresponding to a large number of radial weighting grooves 16 are formed on the upper surfaces of the vicinity 14 and the outer periphery 15 of the dial body 10. Even if 36 is formed, it is possible to suppress the occurrence of cracks in the vicinity of the central portion 14 and the outer peripheral portion 15 of the dial main body 10 along the radial weight grooves 16, thereby cracking the dial main body 10. Can be difficult.

(Embodiment 5)
Next, with reference to FIGS. 14-16, Embodiment 5 which applied this invention to the dial of a wristwatch is demonstrated. Also in this case, the same portions as those in the first embodiment shown in FIGS.
The dial 40 has a configuration in which a large number of weighting grooves 41 are formed radially in a discontinuous state over the entire upper surface of the dial main body 10. Except for this, the dial 40 has substantially the same configuration as that of the first embodiment. Also in this case, the dial main body 10 is formed in a state in which resin molecules 22 are radially arranged by flowing resin radially from the central portion toward the outer peripheral portion. A shaft insertion hole 9 is formed at the center of the shaft.

  As shown in FIGS. 14 to 16, the large number of weight grooves 41 are formed radially from the periphery of the shaft insertion hole 9 toward the outer peripheral end of the dial main body 10, and at predetermined locations along the radial direction. The structure is regularly interrupted. That is, as shown in FIG. 16, the weight groove 41 is provided with a discontinuity portion 41 a at regular intervals S in the radial direction, and each weight groove 41 adjacent to each other as shown in FIG. 15. It is formed in a state where the positions of the interrupted portions 41a are alternately shifted.

  According to such a dial plate 40, the dial plate body 10 is formed in a state where the resin molecules 22 are radially arranged by flowing resin radially from the center portion of the dial plate body 10 toward the outer peripheral portion. Since a large number of weighting grooves 41 are formed radially on the upper surface of the dial plate body 10 in a discontinuous state, the arrangement direction of the resin molecules 22 arranged radially and the number of weights formed radially are formed. Even if the grooves 41 coincide with each other, it is possible to prevent cracks from occurring continuously in the dial main body 10 along the radial weight grooves 41 by the discontinuous portions 41a provided in the respective weight grooves 41. Thus, the dial main body 10 can be made difficult to break.

  In the fifth embodiment, the case is described in which a large number of weighting grooves 41 are radially formed in a regular discontinuous state over the entire upper surface of the dial main body 10. However, the present invention is not limited to this. For example, FIGS. As in the case of the dial plate 45 of the modification shown in FIG. 19, a configuration may be adopted in which a large number of weighting grooves 46 are formed radially and irregularly in the entire upper surface of the dial plate body 10.

  That is, as shown in FIGS. 18 and 19, the weighting groove 46 of the dial plate 45 has a configuration in which break portions 46 a are provided at irregular intervals in the radial direction. Also in such a dial plate 45, as in the fifth embodiment, cracks are continuously generated in the dial plate body 10 along the radial fabric grooves 46 by the discontinuous portions 46 a provided in the respective fabric grooves 46. This can prevent the dial main body 10 from being broken.

(Embodiment 6)
Next, with reference to FIGS. 20 and 21, a sixth embodiment in which the present invention is applied to a dial of a wristwatch will be described. Also in this case, the same portions as those in the first embodiment shown in FIGS.
The dial plate 50 has a structure in which a large number of weight grooves 51 are formed radially on the entire upper surface of the dial body 10 and a decorative sheet 52 is attached to the upper surface on which the large number of weight grooves 51 are formed. Has substantially the same configuration as that of the first embodiment. Also in this case, the dial main body 10 is formed in a state in which resin molecules 22 are radially arranged by flowing resin radially from the central portion toward the outer peripheral portion. A shaft insertion hole 9 is formed at the center of the shaft.

  As shown in FIG. 20, a large number of weighting grooves 51 are formed radially from the periphery of the shaft insertion hole 9 provided at the center of the dial main body 10 toward the outer periphery of the dial main body 10. The decorative sheet 52 is made of a transparent synthetic resin such as PET (polyethylene terephthalate) or PC (polycarbonate), and has concentric circular shapes having different sizes around the center of the shaft insertion hole 9 that is the center of the dial body 10. It is formed in a ring shape. As shown in FIGS. 20 and 21, the decorative sheet 52 is attached to the vicinity of the center portion 53 and the vicinity of the outer peripheral portion 54 of the dial body 10 by thermocompression bonding or the like.

  According to such a dial plate 50, the resin molecules 22 are radially arranged by flowing resin radially from the center portion of the dial plate body 10 toward the outer peripheral portion, and the dial plate body 10 is formed. A large number of weighting grooves 51 are formed radially on the upper surface of the dial main body 10, and a decorative sheet 52 is formed on each upper surface near the center 53 and the outer periphery 54 of the dial main body 10 where the weighting grooves 51 are formed. Are attached, so that even if the arrangement direction of the resin molecules 22 arranged in a radial pattern and the numerous massing grooves 51 formed in a radial pattern coincide with each other, the vicinity of the central portion 53 and the outer peripheral portion of the dial main body 10 are obtained. The decorative sheet 52 attached to each upper surface with the vicinity 54 can suppress the occurrence of continuous cracks in the dial plate body 10 along the radial weighting grooves 51, and thereby the dial plate body 10. It can be difficult to break.

  In the sixth embodiment, the case where the decorative sheet 52 is attached to the upper surfaces of the vicinity of the central portion 53 and the vicinity of the outer peripheral portion 54 of the dial main body 10 in which a large number of weights 51 are formed has been described. Not limited to this, a transparent synthetic resin is formed on the entire lower surface of the dial main body 10 in which a large number of weight grooves 51 are radially formed on the upper surface, such as the dial 55 of the modification shown in FIGS. The disk-shaped sheet member 56 made of may be attached with an adhesive 57. Even in such a dial plate 55, as in the case of the sixth embodiment, even if the arrangement direction of the resin molecules 22 arranged in a radial pattern and the numerous dovetail grooves 51 formed in a radial pattern coincide with each other, The decorative sheet 56 affixed to the entire lower surface can prevent the dial main body 10 from being cracked along the radial weight grooves 51, thereby making the dial main body 10 difficult to break.

(Embodiment 7)
Next, a seventh embodiment in which the present invention is applied to a dial of a wristwatch will be described with reference to FIGS. Also in this case, the same portions as those in the first embodiment shown in FIGS.
The dial 60 has a configuration in which a concave groove 61 is formed in a circular shape in the vicinity of the periphery of the shaft insertion hole 9 located at the center of the dial main body 10, and the other configuration is substantially the same as that of the first embodiment. Yes.

  That is, on the upper surface of the dial main body 10, as shown in FIG. 24, a large number of weighting grooves 62 radiate from the periphery of the shaft insertion hole 9 to the outer peripheral end of the dial main body 10 except for the concave grooves 61. Is formed. As shown in FIGS. 24 to 26, the concave groove 61 of the dial main body 10 prevents the resin from flowing radially from the center portion of the dial main body 10 to the outer peripheral portion, thereby turbulently flowing the resin. The cross section is formed in a rectangular shape that is sufficiently deeper and wider than the radial weight groove 62, and is formed in a circular shape along the periphery of the shaft insertion hole 9.

  Such a dial plate 60 is formed by a molding die 63 shown in FIG. That is, the molding die 63 includes an upper die 63a and a lower die 63b as in the first embodiment, and a concave portion having the same shape as the dial main body 10 is formed on the lower surface of the upper die 63a. By closing the recess with the upper surface of the lower mold 63b, a cavity 64 having the same shape as the dial body 10 is formed in the upper mold 63a and the lower mold 63b.

  Further, as shown in FIG. 29, the upper mold 63a is provided with a gate 65 at a location corresponding to the central portion of the dial body 10 in the cavity 64, that is, a location corresponding to the shaft insertion hole 9 of the dial body 10. It has been. Further, on the inner surface of the upper mold 63 a corresponding to the upper surface of the cavity 64, a number of weight forming grooves 66 are formed radially from the periphery of the shaft insertion hole 9 in the dial main body 10 to the outer peripheral end of the dial main body 10. Is formed. Further, on the inner surface of the upper mold 63 a corresponding to the upper surface of the cavity 64, a protrusion 67 having a rectangular cross section for forming the concave groove 61 of the dial main body 10 is circular along the periphery of the shaft insertion hole 9. It is formed into a shape.

  When the dial 60 is molded with the molding die 63, polycarbonate (PC) or the like is put into the cavity 64 from the gate 65 of the upper die 63a with the upper die 63a and the lower die 63b being overlapped. Inject resin. Then, as shown by the arrow in FIG. 26, the injected resin is disturbed in the radial direction by the protrusions 67 provided around the gate 65 of the cavity 64 and turbulently flows. As a result, the resin molecules 22 are injected into the cavity 64 in an irregular arrangement state, and a molded article to be the dial body 10 is formed.

  In this molded product, the resin turbulently flows from the central portion in the cavity 64 toward the outer periphery without radiating regularly, so that the resin molecules 22 are formed in an irregular arrangement state as shown in FIG. Is done. Further, at this time, a large number of weight forming grooves 66 formed radially on the inner surface of the upper mold 63a are formed on the upper surface of the dial body 10 which is a molded product, from the center portion to the outer peripheral portion. 62 is formed radially. Thereafter, the upper mold 63a and the lower mold 63b are separated from each other, and the molded product is taken out. The gate 65 is removed from the center of the molded product, and a shaft insertion hole is formed at a position located at the center of the dial plate body 10. 9 is formed. As a result, the dial 60 shown in FIGS. 24 and 25 is formed.

  As described above, according to the dial 60, a large number of weight grooves 62 are radially formed on the upper surface of the dial main body 10 formed by flowing resin radially from the center of the dial main body 10 toward the outer periphery. In the vicinity of the shaft insertion hole 9, which is the central portion of the dial plate body 10, a concave groove 61 is provided in a circular shape for obstructing the flow of the resin during the molding of the dial plate body 10 and turbulent resin. Therefore, when the dial plate body 10 is molded by flowing resin from the center portion toward the outer peripheral portion, the resin molecules 22 can be irregularly arranged by turbulent flow of the resin by the concave grooves 61.

  For this reason, even if a large number of weighting grooves 62 are formed radially on the upper surface of the dial body 10, it is possible to prevent the radial weighting grooves 62 from being aligned with the arrangement direction of the resin molecules 22. Therefore, it is possible to suppress the occurrence of cracks in the dial main body 10 along the radial weight grooves 62, so that the dial main body 10 can be made difficult to crack.

  In the seventh embodiment, a concave groove 61 is formed in the vicinity of the shaft insertion hole 9 that is the central portion of the dial main body 10 to prevent the resin from flowing when the dial main body 10 is molded and to turbulent resin. Although the case where it was provided in the shape has been described, the present invention is not limited thereto, and for example, in the vicinity of the shaft insertion hole 9 that is the center portion of the dial main body 10, like the dial 70 of the modification shown in FIGS. 27 and 28, A configuration may be provided in which a circular insert member 71 is provided for disturbing the flow of resin by molding the dial main body 10 so as to disturb the resin flow. In this case, the insert member 71 is made of metal or synthetic resin, and may be disposed in the cavity 64 of the molding die 63 in advance before injecting the resin.

  Even in such a dial plate 70, when the dial plate body 10 is formed by flowing resin from the center portion toward the outer peripheral portion, the resin molecules 22 are irregularly arranged by turbulent flow of the resin by the insert member 71. Can be made. For this reason, as in the seventh embodiment, even if a large number of weighting grooves 72 are formed radially on the upper surface of the dial main body 10, the radial weighting grooves 72 and the arrangement direction of the resin molecules 22 are prevented from matching. As a result, it is possible to suppress the occurrence of cracks in the dial plate body 10 along the radial weighting grooves 72, and the strength of the dial plate body 10 can be increased by the insert member 71. The dial body 10 can be made difficult to break.

  Moreover, in the said Embodiment 7 and its modification, although the case where the ditch | groove 61 or the insert member 71 was provided in the upper surface side of the dial main body 10 was described, it is not restricted to this, For example, in the lower surface side of the dial main body 10 The concave groove 61 or the insert member 71 may be provided, and the concave groove 61 or the insert member 71 does not have to be circular, and is formed in a non-circular shape such as a polygon such as a quadrangle, a pentagon, and a hexagon, or an ellipse. It does not have to be a continuous shape.

In the first to seventh embodiments and the modifications thereof, the description has been given of the case where the weight grooves 16, 41, 46, 51, 62, and 72 are provided radially on the upper surface of the dial main body 10. However, the present invention is not limited thereto. Instead, for example, a dial plate 80 shown in FIGS. 29 and 30 may have a configuration in which a plurality of weight grooves 81 are formed in a straight line parallel to each other on the upper surface of the dial main body 10. In this case, as shown in FIGS. 29 and 30, a large number of weighting grooves 81 are formed in a straight line parallel to each other except for the vicinity 82 of the center portion of the dial body 10 and the outer peripheral portion 83 of the dial body 10. In addition, the vicinity of the central portion 82 and the outer peripheral portion 83 of the dial plate body 10 is more than the portion where the weighting groove 81 is formed.
It may be formed one step lower, or conversely one step higher.

  In addition, for example, as in the third embodiment shown in FIGS. 10 and 11, circular intersection grooves 31, 32 are formed in the vicinity of the center portion 82 of the dial main body 10 and the outer peripheral portion 83 of the dial main body 10. May be formed concentrically. Further, as in the fourth embodiment shown in FIGS. 12 and 13, the thickness of the vicinity 82 of the center portion of the dial main body 10 and the outer peripheral portion 83 of the dial main body 10 is set to a portion where a plurality of weight grooves 81 are formed. It may be formed thicker than the thickness, and a number of continuous grooves corresponding to the number of weighting grooves 81 may be formed in the vicinity of the center portion 82 and the outer peripheral portion 83.

  Further, the present invention is not limited to these, and a number of weighting grooves 81 may be formed in a discontinuous state in a straight line parallel to each other, as in the fifth embodiment shown in FIGS. A configuration in which the decorative sheet 52 or the decorative sheet 56 is attached to one of the upper and lower surfaces of the dial body 10 in which a large number of weighting grooves 81 are formed, as in the sixth embodiment shown in FIGS. But it ’s okay. Further, as in the seventh embodiment shown in FIGS. 24 to 28 and the modification thereof, the concave groove 61 or the insert member 71 is provided in the vicinity of the center portion of the dial main body 10 to prevent the resin from flowing. The molecules 22 may be formed in an irregular arrangement state. In any of such configurations, there are the same functions and effects as in the first to seventh embodiments and their modifications.

  In the first to seventh embodiments and the modifications thereof, the description has been given of the case where the weight grooves 16, 41, 46, 51, 62, 72, 81 are provided on the upper surface of the dial main body 10. It is not necessary to provide on the upper surface of the main body 10, and it may be provided on the lower surface of the dial main body 10.

  Furthermore, in the first to seventh embodiments and each of the embodiments, the case where the present invention is applied to a wristwatch has been described. However, the present invention is not limited thereto. It can also be widely applied to various instruments such as meters.

It is the expanded sectional view which showed the principal part of the wristwatch to which this invention is applied. (Embodiment 1) It is the front view which showed the dial plate of FIG. 2 is a cross-sectional view of the dial of FIG. 2, (a) is an enlarged cross-sectional view taken along arrow AA in FIG. 2, and (b) is an enlarged cross-sectional view taken along arrow BB in FIG. 2. It is sectional drawing which showed the metal mold | die for shape | molding the dial of FIG. It is the figure which showed the state which resin flows radially in the metal mold | die of FIG. 4 which is shown by the arrow. It is the enlarged view which showed the arrangement | sequence state of the molecule | numerator of the resin in the A section of FIG. The cross section of the dial which showed the modification of Embodiment 1 is shown, (a) is an expanded sectional view corresponding to the AA arrow of Drawing 2, and (b) corresponds to the BB arrow of Drawing 2. It is an expanded sectional view. It is the front view which expanded and showed the dial of the wristwatch to which this invention is applied. (Embodiment 2) 8 shows a cross section of the dial of FIG. 8, (a) is an enlarged sectional view taken along the line CC of FIG. 8, and (b) is an enlarged sectional view taken along the line DD of FIG. 8. It is the front view which expanded and showed the dial of the wristwatch to which this invention is applied. (Embodiment 3) 10 shows a cross section of the dial of FIG. 10, (a) is an enlarged cross-sectional view taken along the line EE in FIG. 10, and (b) is an enlarged cross-sectional view taken along the line FF of FIG. 10. It is the front view which expanded and showed the dial of the wristwatch to which this invention is applied. (Embodiment 4) 12 shows a cross section of the dial of FIG. 12, (a) is an enlarged cross-sectional view taken along line GG in FIG. 12, and (b) is an enlarged cross-sectional view taken along line HH in FIG. 12. It is the front view which expanded and showed the dial of the wristwatch to which this invention is applied. (Embodiment 5) It is the enlarged view which showed the B section of FIG. It is an expanded sectional view in the II arrow of FIG. FIG. 10 is a front view of a dial showing a modification of the fifth embodiment. It is the enlarged view which showed the C section of FIG. It is an expanded sectional view in the JJ arrow of FIG. It is the front view which expanded and showed the dial of the wristwatch to which this invention is applied. (Embodiment 6) 20 shows a cross section of the dial of FIG. 20, (a) is an enlarged cross-sectional view taken along line KK in FIG. 20, and (b) is an enlarged cross-sectional view taken along line LL in FIG. 20. FIG. 10 is a front view of a dial showing a modification of the sixth embodiment. 22 shows a cross section of the dial of FIG. 22, (a) is an enlarged cross-sectional view taken along line MM in FIG. 22, and (b) is an enlarged cross-sectional view taken along line NN in FIG. 22. It is the front view which expanded and showed the dial of the wristwatch to which this invention is applied. (Embodiment 7) 24 shows a cross section of the dial of FIG. 24, (a) is an enlarged cross-sectional view taken along the line PP of FIG. 24, and (b) is an enlarged cross-sectional view taken along the line Q-Q of FIG. It is sectional drawing which showed the metal mold | die for shape | molding the dial plate of FIG. FIG. 10 is a front view of a dial showing a modification of the seventh embodiment. 27 shows a cross-section of the dial of FIG. 27, (a) is an enlarged cross-sectional view taken along line RR in FIG. 27, and (b) is an enlarged cross-sectional view taken along line SS of FIG. It is the front view which showed the modification of the dial of this invention. It is an expanded sectional view in the TT arrow view of FIG.

Explanation of symbols

8, 25, 30, 35, 40, 45, 60, 70, 80 Dial 9 Axis insertion hole 10 Dial body 14, 82 Near the center of the dial body 15, 83 Perimeter of the dial body 16, 41, 46, 51, 62, 72, 81 Fabrication groove 17, 63 Mold 18, 64 Cavity 19, 65 Gate 20, 66 Fabrication groove 22 Resin molecule 31, 32 Circular crossing groove 36 Continuous groove 41a, 46a Interrupted portion 52, 56 Decorative sheet 61 Groove 71 Insert member 67 Projection

Claims (14)

In the dial plate forming the dial body by flowing resin radially from the center to the outer periphery,
A dial having a large number of weighting grooves formed in a straight line on one surface of the front and back of the dial main body, excluding the vicinity of the central portion and the outer peripheral portion.   2. The character according to claim 1, wherein a surface in the vicinity of the center portion and a surface of the outer peripheral portion of the one surface of the dial main body in which the weight grooves are formed are each formed as a flat surface. Board.   The flat surface of the vicinity of the central portion and the outer peripheral portion on the one surface of the dial main body is formed one step lower than a portion where the weighting groove is formed. The written dial.   The flat surface of the vicinity of the central portion and the outer peripheral portion of the one surface of the dial main body is formed one step higher than a portion where the weighting groove is formed. The written dial.   The central portion of the dial main body corresponding to the location where the resin is injected into at least one of the flat surface in the vicinity of the central portion of the dial main body and the flat surface of the outer peripheral portion. The dial according to any one of claims 1 to 4, wherein a plurality of circular grooves centering on each other are formed concentrically.   At least one flat surface of the flat surface in the vicinity of the central portion of the dial body and the flat surface of the outer peripheral portion formed one step higher than the portion where the weighting groove is formed includes: The dial according to claim 4, wherein a plurality of continuous grooves corresponding to the plurality of weighting grooves are formed. In the dial plate forming the dial body by flowing resin radially from the center to the outer periphery,
A dial having a large number of perforated grooves formed in a discontinuous state on one surface of the dial body. In the dial plate forming the dial body by flowing resin radially from the center to the outer periphery,
A plurality of weight grooves are formed linearly on one surface of the dial main body, and a sheet member is attached to one of the one surface of the dial main body and the other surface opposite thereto. Dial. In the dial plate forming the dial body by flowing resin radially from the center to the outer periphery,
On the front and back surfaces of the dial main body, a number of weight grooves are formed in a straight line, and the resin is injected into the dial main body in the vicinity of the central portion of the dial main body where the resin is injected. A dial having a concave portion for preventing the flow of the resin to turbulently flow the resin.   The dial according to claim 9, wherein an insert member is provided in the recess. A cavity formed in the same shape as the dial main body, and a gate provided at a location corresponding to the central portion of the dial main body in the cavity, a resin is injected from the gate into the cavity, and the resin A mold for molding the dial main body by flowing radially from the central portion of the cavity toward the outer peripheral side,
A molding die, wherein a blocking portion for blocking the flow of the resin and causing the resin to flow turbulently is provided in the vicinity of the central portion of the cavity provided with the gate.   The molding die according to claim 11, wherein the obstructing portion is a protrusion integrally formed on an inner surface of the cavity.   The molding die according to claim 11, wherein the obstruction part is an insert member disposed on an inner surface of the cavity.   The dial according to any one of claims 11 to 13, wherein a plurality of weight forming grooves are formed linearly on the inner surface of the cavity.

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