JP2009236640A - Method of manufacturing timepiece dial plate, timepiece dial plate and timepiece - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a timepiece dial plate comprising shell which is not flat and having an excellent aesthetic appearance, a manufacturing method for manufacturing the timepiece dial plate, and a timepiece with the timepiece dial plate. <P>SOLUTION: The method of manufacturing the timepiece dial plate 1 has: a recess forming process for forming a recess by projecting a projection material 7 to a shell substrate 3 comprising the shell; and a colored section forming process for filling the recess with a colored section forming material 9, and forming a colored section. Preferably, a spray pressure of the projection material 7 in the recess forming process is 2.0-5.0 kgf/cm<SP>2</SP>. An average particle diameter of the projection material 7 used in the recess forming process is preferably 50-80 μm. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a timepiece dial manufacturing method, a timepiece dial, and a timepiece.

Conventionally, a metal dial or a plastic dial has been widely used as a timepiece dial.
On the other hand, there is also a timepiece dial using a shell having a greatly different appearance from the timepiece dial as described above. The shell generally has a unique luster and pattern, and has an excellent aesthetic appearance and a high-class feeling.

  However, shells are generally difficult to be finely processed. In particular, when trying to apply to a watch dial with a limited thickness, it is difficult to apply irregularities to the shells. It was extremely difficult. For this reason, in a timepiece dial using a conventional shell, a flat plate that has not been finely processed is only pasted on a part or the entire surface of the substrate. For this reason, it has not been possible to meet the demand for further improvement of the aesthetic appearance of the timepiece dial (particularly, to obtain a timepiece dial having an excellent three-dimensional appearance and a high-quality appearance).

  By the way, as an attempt to form a recess in the shell, there is a method by etching (see, for example, Patent Document 1). However, with such a method, it is extremely difficult to form a recess having a desired shape. That is, the shell generally has a ridge pillar layer, and has a structure in which polygonal araleite crystals are stacked in multiple layers (a structure like a brickwork). When the shell is etched, the etchant enters between the aragonite crystals, and isotropic etching cannot be performed, and the recess formed by etching. The inner surface of the sword will become a sizzling and inferior aesthetic appearance.

JP 2000-98059 A

  An object of the present invention is to provide a timepiece dial composed of an uneven shell and having an excellent aesthetic appearance, to provide a production method capable of producing the timepiece dial, The object is to provide a timepiece having a timepiece dial.

Such an object is achieved by the present invention described below.
The manufacturing method of the timepiece dial of the present invention includes a concave portion forming step of forming a concave portion by projecting a projection material onto a shell base material composed of a shell.
And a colored portion forming step of filling the recessed portion with a colored portion forming material to form a colored portion.
Thereby, the manufacturing method which can be comprised with the uneven shell and can manufacture the dial for timepieces which has the outstanding aesthetic appearance can be provided.

In the timepiece dial manufacturing method of the present invention, the colored portion forming step may be performed by projecting a mixture of a projection material and the colored portion forming material toward the shell base material. preferable.
Thereby, the adhesiveness with respect to the shell base material of a coloring part can be made especially excellent.
In the timepiece dial manufacturing method of the present invention, the colored portion forming material is preferably fine particles having an average particle diameter of 500 nm or less.
Thereby, while being able to make the adhesiveness with respect to the shell base material of a coloring part especially excellent, the aesthetic appearance of the timepiece dial manufactured can be made especially excellent.

In the timepiece dial manufacturing method of the present invention, it is preferable that an injection pressure of the projection material in the colored portion forming step is smaller than an injection pressure of the projection material in the concave portion forming step.
Thereby, it is possible to suitably form the colored portion while reliably preventing unintentional cracking or chipping from occurring in the shell material.

In the timepiece dial manufacturing method of the present invention, it is preferable that an average particle size of the projection material used in the colored portion forming step is smaller than an average particle size of the projection material used in the concave portion forming step. .
Thereby, it is possible to efficiently form the colored portion while reliably preventing unintentional cracks and chips from being generated in the shell base material. In addition, the adhesion of the colored portion to be formed to the shell base material can be made particularly excellent, and the aesthetic appearance of the timepiece dial can be made particularly excellent.

In the timepiece dial manufacturing method of the present invention, it is preferable that an injection pressure of the projection material in the colored portion forming step is 0.5 to 2.5 kgf / cm ² .
As a result, the adhesion to the shellfish substrate of the colored portion to be formed can be made particularly excellent while reliably preventing unintentional cracks and chips from occurring in the shellfish substrate. The aesthetic appearance of the timepiece dial can be made particularly excellent.

In the timepiece dial manufacturing method of the present invention, it is preferable that an average particle diameter of the projection material used in the colored portion forming step is 5 to 25 μm.
Thereby, it is possible to efficiently form the colored portion while reliably preventing unintentional cracks and chips from being generated in the shell base material. In addition, the adhesion of the colored portion to be formed to the shell base material can be made particularly excellent, and the aesthetic appearance of the timepiece dial can be made particularly excellent.

In the timepiece dial manufacturing method of the present invention, the colored portion forming step projects a projection material toward the colored portion forming material in a state where the colored portion forming material is arranged on the shell base material. It is preferable that it is performed by doing.
Thereby, the formation efficiency of the colored portion can be made particularly excellent, and the productivity of the timepiece dial can be made particularly excellent. Further, it becomes easy to collect and reuse the coloring portion forming material that has not been used for forming the coloring portion.

In the timepiece dial manufacturing method of the present invention, the colored portion forming material is preferably a metal thin film.
Thereby, the formation efficiency of the colored portion can be further improved, and the productivity of the timepiece dial can be further improved.
In the method for manufacturing a timepiece dial according to the aspect of the invention, it is preferable that the colored portion forming material is a metal powder.
Thereby, the formation efficiency of the colored portion can be made particularly excellent, the productivity of the timepiece dial can be made particularly excellent, and the adhesion of the colored portion to the shellfish base material is particularly excellent. Can be. Moreover, the selective arrangement | positioning of the colored part formation material in the recessed part of a shellfish base material can be performed suitably in the colored part formation process. As a result, it is possible to more reliably prevent the colored portion forming material from adhering to unintentional parts, and the aesthetic appearance of the timepiece dial can be more reliably improved.

In the timepiece dial manufacturing method of the present invention, it is preferable that an injection pressure of the projection material in the recess forming step is 2.0 to 5.0 kgf / cm ² .
Thereby, the recessed part of the target shape can be formed efficiently, preventing reliably that an unintentional crack, a chip | tip, etc. will generate | occur | produce in a shell base material. Moreover, the adhesiveness with respect to the shell base material of the coloring part formed at a later process can be made particularly excellent.

In the timepiece dial manufacturing method of the present invention, it is preferable that an average particle diameter of the projection material used in the recess forming step is 40 to 80 μm.
Thereby, the recessed part of the target shape can be formed efficiently, preventing reliably that an unintentional crack, a chip | tip, etc. will generate | occur | produce in a shell base material. Moreover, the adhesiveness with respect to the shell base material of the coloring part formed at a later process can be made particularly excellent.

The timepiece dial of the present invention is manufactured using the method of the present invention.
Thereby, it is possible to provide a timepiece dial which is composed of an uneven shell and has an excellent aesthetic appearance.
The timepiece of the present invention includes the timepiece dial of the present invention.
Thereby, the timepiece having an excellent aesthetic appearance can be provided.

  According to the present invention, there is provided a timepiece dial composed of an uneven shell and having an excellent aesthetic appearance, a production method capable of producing the timepiece dial, and A timepiece having a timepiece dial can be provided.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. Note that the drawings referred to in this specification show part of the configuration in an emphasized manner, and do not accurately reflect actual dimensions and the like.
<Manufacturing method of timepiece dial>
First, the manufacturing method of this invention is demonstrated.
<< First Embodiment >>
FIG. 1 is a cross-sectional view showing a first embodiment of a method for manufacturing a timepiece dial according to the present invention.
The manufacturing method of this embodiment includes a shell base material preparation step (1a) for preparing a shell base material 3 on a thin plate made of shells, and a mask for forming a mask 6 in a predetermined pattern on the shell base material 3 A recess forming step (1c, 1d) for forming the recess 31 by projecting the projection material 7 onto the shell substrate 3 partially covered with the mask 6 with the forming step (1b), and the recess 31 A colored part forming step (1e, 1f) for filling the colored part forming material in the inside to form the colored part 4, and a joining step (1g) for joining the shell base material 3 provided with the colored part 4 to the substrate 2 And a mask removing step (1h) for removing the mask 6 from the shell base material 3. In particular, in this embodiment, in the colored portion forming step, the colored portion 4 is formed by a method of projecting a mixture of the projection material 8 and the colored portion forming material 9 toward the shell base material 3.

[Shell base material preparation process]
First, a shell base material 3 composed of shells is prepared (1a).
The shell base material 3 is a thin plate-like member made of shells.
Examples of shells constituting the shell base material 3 include shells such as white butterfly shells, black butterfly shells, brown butterfly shells, red butterfly shells, yellow butterfly shells, and abalone. The shell base material 3 can be obtained, for example, by subjecting the shell as described above to press processing, punching processing, or the like. Further, the shell substrate 3 may have a surface cleaned by washing or the like. Moreover, you may perform processes, such as grinding | polishing, with respect to the shell base material 3 as needed.

The average thickness of the shell base material 3 is preferably 50 to 700 μm, and more preferably 100 to 500 μm.
Since shells are generally excellent in electromagnetic wave permeability, a timepiece dial 1 having such a shell base material 3 is, for example, a radio timepiece, a solar timepiece (a timepiece with a built-in solar cell), or a solar radio wave. It can be suitably applied to a timepiece or the like.

[Mask formation process]
Next, a mask 6 is formed in a predetermined pattern on the surface of the shell substrate 3 (1b).
For example, the mask 6 is formed by a method such as a gravure coating method, a bar coating method, a spray coating method, a spin coating method, a knife coating method, a roll coating method, a die coating method, a brush coating method, a laminating method for applying a photosensitive film, or the like. The mask 3 can be formed by forming a mask forming film on the entire surface of one main surface of the material 3 and then selectively removing a part of the mask forming film. As the mask forming film, for example, a film made of a resist material can be used. Further, as a method for selectively removing a part of the mask formation film, for example, a photoresist method using a photomask can be employed. The mask 6 may be formed by various printing methods such as a screen printing method, a gravure printing method, and an ink jet method, for example.

  Although the thickness of the mask 6 formed at this process is not specifically limited, It is preferable that it is 1-80 micrometers, and it is more preferable that it is 5-50 micrometers. Thereby, the adhesion of the mask 6 to the shell base material 3 is sufficiently excellent, and the mask of the shell base material 3 is used in a recess forming step, which will be described later, while reliably preventing misalignment or the like. The part covered with 6 can be reliably protected.

[Recess formation step]
Next, the recessed part 31 is formed in the surface side in which the mask 6 of the shellfish base material 3 was provided (1c, 1d).
The recess 31 is formed by projecting the projection material 7 onto the shellfish substrate 3 partially covered with the mask 6.
By the way, the shell generally has a ridge pillar layer, and has a structure in which polygonal araleite crystals are stacked in layers (a structure like brickwork). Further, the plurality of layers are not oriented in the same direction but are directed in various directions. For this reason, for example, when the concave portion is formed by etching, the etching solution enters between the araleite crystals, and isotropic etching cannot be performed. , It will be a little standing, and it will be inferior in aesthetic appearance. Moreover, when a recessed part is formed by etching, the inner surface of the formed recessed part is raised and it is difficult to reliably remove it from the shell material. Therefore, the shell base material is gradually etched by the remaining etching solution, and the manufactured timepiece dial is extremely inferior in durability. On the other hand, in the present invention, a concave portion having a smooth inner wall surface can be formed, and the aesthetic appearance of the finally obtained dial 1 for watch is very excellent.

  As the projection material 7, for example, steel grit, alumina powder, glass beads, stainless beads, garnet, cinnabar sand, plastic, cut wire, slag and the like can be used. Of these, alumina powder is particularly preferable. Thereby, it is possible to selectively form the recess 31 in the shell base material 3 while effectively preventing the mask 6 from being damaged. For this reason, the recessed part 31 of a desired shape can be formed easily and reliably.

  The average particle diameter of the projection material 7 is preferably 40 to 80 μm, and more preferably 50 to 70 μm. When the average particle diameter of the projection material 7 is a value within the above range, the shell base material 3 is reliably prevented from being unintentionally cracked or chipped, and the concave portion 31 having the target shape is formed. It can be formed efficiently. Moreover, the adhesiveness with respect to the shell base material 3 of the coloring part 4 formed at a later process can be made particularly excellent. On the other hand, when the average particle diameter of the projection material 7 is less than the lower limit value, the projection materials are likely to aggregate together, and it becomes difficult to efficiently form the recesses 31. Moreover, when the average particle diameter of the projection material 7 exceeds the said upper limit, it may become difficult to form the recessed part 31 of the target shape. In particular, when the fine pattern of the concave portion 31 is formed, the above tendency becomes remarkable.

Injection pressure of the shot material 7 is preferably from 2.0~5.0kgf / cm ^2, and more preferably 2.5~4.5kgf / cm ^2. When the injection pressure of the projection material 7 is a value within the above range, the shell base material 3 can be efficiently prevented from having undesired cracks, chips, etc., while the recess 31 having the desired shape is efficiently produced. Can be well formed. Moreover, the adhesiveness with respect to the shell base material 3 of the coloring part 4 formed at a later process can be made particularly excellent.

The depth (average value) of the recess 31 formed in this step is preferably 10 to 60% of the average thickness of the shell base material 3, and more preferably 30 to 50%. Thereby, the aesthetic appearance of the timepiece dial 1 can be made particularly excellent while the durability of the timepiece dial 1 is sufficiently excellent.
The specific value (average value) of the depth of the recess 31 is preferably 10 to 300 μm, and more preferably 50 to 250 μm.

  Further, the surface roughness Ra (surface roughness Ra of the processed surface) of the inner surface of the recess 31 formed in this step is preferably 0.1 to 10 μm, and preferably 0.2 to 8.0 μm. More preferred. When the surface roughness Ra of the inner surface of the concave portion 31 is a value within the above range, the timepiece dial produced is manufactured while the adhesion between the colored portion 4 and the shell base material 3 described in detail later is particularly excellent. The aesthetic appearance of 1 can be made particularly excellent.

[Colored part forming step]
Next, the colored portion forming material is filled in the recess 31 to form the colored portion 4 (1e, 1f). By forming the colored portion 4 in this manner, the timepiece dial 1 includes the shell base material 3 made of a shell and the colored portion 4 made of a colorant forming material. It is possible to express the unique texture of the material. As a result, the appearance of the timepiece dial can be varied. In particular, by changing the arrangement pattern of the colored portions, it is possible to provide a wide variety of timepiece dials having excellent aesthetic appearance.
In particular, in this embodiment, the colored portion 4 is formed by a method of projecting a mixture of the projection material 8 and the colored portion forming material 9 toward the shell base material 3. By using such a method, the adhesion of the colored portion 4 to the shell base material 3 can be made particularly excellent.

  As the colored portion forming material 9, for example, a metal material, a colorant such as a pigment / dye, a colored resin material, or the like can be used. Among these, a metal material is preferable. Thus, the manufactured timepiece dial 1 can exhibit the glossiness and high-class feeling peculiar to the metal material, and the aesthetic appearance of the timepiece dial 1 can be made particularly excellent. The adhesion to the base material 3 can be made particularly excellent, and the durability of the timepiece dial 1 can be made particularly excellent.

Examples of the metal material constituting the colored portion forming material include Fe, Cu, Zn, Ni, Mg, Cr, Mn, Mo, Nb, Al, V, Zr, Sn, Au, Pd, Pt, Ag, and Co. , In, W, Ti, Rh, and alloys containing at least one of these.
In the present embodiment, the colored portion forming material 9 may be any material that can be mixed with the projection material 8, but is preferably fine particles having an average particle size of 500 nm or less. Thereby, while being able to make the adhesiveness with respect to the shell base material 3 of the coloring part 4 excellent especially, the aesthetic appearance of the timepiece dial 1 manufactured can be made especially excellent.
As described above, the average particle diameter of the colored portion forming material 9 is preferably 500 nm or less, more preferably 5 to 400 nm, and even more preferably 10 to 300 nm. Thereby, the effects as described above are more remarkably exhibited.

  As the projection material 8, for example, steel grit, alumina powder, glass beads, stainless beads, garnet, cinnabar sand, plastic, cut wire, slag and the like can be used. Of these, alumina powder is particularly preferable. Thereby, the coloring part 4 can be formed suitably, preventing the mask 6 and the shellfish base material 3 from being damaged effectively. For this reason, the aesthetic appearance and durability of the timepiece dial 1 can be easily and reliably formed.

It is preferable that the injection pressure of the projection material 8 in this process is smaller than the injection pressure of the projection material 7 in the above-described recess forming process. Thereby, the colored part 4 can be suitably formed while reliably preventing unintentional cracks, chips, and the like from occurring in the shell base material 3.
Specifically, the injection pressure of the shot material 8 in this step is preferably from 0.5~2.5kgf / cm ^2, and more preferably 0.8~2.3kgf / cm ^2. When the spray pressure of the projecting material 8 is a value within the range of the predecessor, the shell of the colored portion 4 that is formed is more reliably prevented from unintentionally cracking or chipping in the shell base material 3. The adhesion to the base material 3 can be further improved, and the aesthetic appearance of the timepiece dial 1 can be further improved.

  Moreover, it is preferable that the average particle diameter of the projection material 8 used at this process is smaller than the average particle diameter of the projection material 7 used at the recessed part formation process mentioned above. Thereby, the colored part 4 can be efficiently formed while reliably preventing unintentional cracks, chipping, and the like from occurring in the shell base material 3. Moreover, while being able to make the adhesiveness with respect to the shell base material 3 of the colored part 4 formed especially excellent, the aesthetic appearance of the timepiece dial 1 can be made especially excellent.

  Specifically, the average particle diameter of the projection material 8 used in this step is preferably 5 to 25 μm, and more preferably 7 to 20 μm. When the average particle diameter of the projection material 8 is a value within the above range, the colored portion 4 can be more efficiently prevented while more reliably preventing unintentional cracks and chips from occurring in the shell base material 3. Can be formed. Moreover, while being able to make the adhesiveness with respect to the shell base material 3 of the coloring part 4 formed further excellent, the aesthetic appearance of the timepiece dial 1 can be further improved.

The average thickness of the colored portion 4 formed in this step is preferably smaller than the average depth of the concave portion 31. Thereby, it can prevent more reliably that the colored part 4 will be worn out in the manufactured timepiece dial 1.
Although the specific value of the average thickness of the coloring part 4 is not specifically limited, It is preferable that it is 5-250 micrometers, and it is more preferable that it is 30-200 micrometers.

[Jointing process]
The shell material 3 provided with the colored portion 4 is joined to the substrate 2 (1 g).
The joining of the substrate 2 and the shell material 3 can be performed using, for example, an adhesive.
Examples of the constituent material of the substrate 2 include various metal materials and various non-metal materials.
When the board | substrate 2 is comprised by the metal material, the timepiece dial 1 which has the especially outstanding intensity | strength characteristic can be provided. Moreover, when the board | substrate 2 is comprised with a metal material, the board | substrate (dial board main body) 2 itself distribute | arranged to the back surface (surface opposite to an observer) of the shell base material 3 will have the outstanding glossiness. The aesthetic appearance of the timepiece dial 1 as a whole can be made particularly excellent.

When the board | substrate 2 is comprised with a nonmetallic material, the dial 1 for timepieces which are generally comparatively lightweight and easy to carry can be provided, for example. Moreover, when the board | substrate 2 is comprised with a nonmetallic material, it can shape | mold to a desired shape comparatively easily, for example. Moreover, when the board | substrate 2 is comprised with a nonmetallic material, the effect which shields electromagnetic noise is also acquired.
Examples of the metal material constituting the substrate 2 include various metals such as Fe, Cu, Zn, Ni, Mg, Cr, Mn, Mo, Nb, Al, V, Zr, Sn, Au, Pd, Pt, and Ag. , And alloys containing at least one of these (for example, bronze, brass, and white).
Examples of the non-metallic material constituting the substrate 2 include ceramics, plastic (particularly heat resistant plastic), stone, and wood.
When the board | substrate 2 is comprised with ceramics, the dial 1 for timepieces which has the especially outstanding intensity | strength and hardness can be obtained.

  Since plastic is generally excellent in electromagnetic wave (visible light and radio wave) transparency, when the substrate 2 is made of plastic, the timepiece dial 1 is used for a solar timepiece (a timepiece equipped with a solar cell). It can be suitably applied to a dial, a dial for a radio timepiece, and the like. Moreover, when the board | substrate 2 is comprised with a plastic, since especially outstanding moldability can be ensured, it can apply suitably for manufacture of the timepiece dial 1 of a complicated shape.

The substrate 2 may have a substantially uniform composition at each site, or may have a different composition depending on the site. For example, the substrate 2 may have a base portion and a coat layer provided on the base portion.
The shape and size of the substrate 2 are not particularly limited, and are usually determined based on the shape and size of the timepiece dial 1. In the illustrated configuration, the substrate (dial plate main body) 2 has a flat plate shape, but may have a curved plate shape, for example.
Although the average thickness of the board | substrate 2 is not specifically limited, It is preferable that it is 200-700 micrometers, and it is more preferable that it is 300-600 micrometers.

[Mask removal process]
Next, the mask 6 is removed from the shell substrate 3 provided with the colored portions 4 (1h). Thereby, the timepiece dial 1 is obtained.
The removal of the mask 6 can be performed by, for example, peeling from the shell substrate 3 or a method using a solvent that selectively dissolves the mask 6.

<< Second Embodiment >>
FIG. 2 is a cross-sectional view showing a second embodiment of the timepiece dial manufacturing method of the present invention.
The manufacturing method of this embodiment includes a shell base material preparation step (2a) for preparing a shell base material 3 on a thin plate made of shells, and a mask for forming a mask 6 in a predetermined pattern on the shell base material 3 A forming step (2b), a recess forming step (2c, 2d) for forming the recess 31 by projecting the projection material 7 onto the shell substrate 3 partially covered with the mask 6, and a colored portion By projecting the projection material 8 toward the colored portion forming material 9 in a state where the forming material 9 is disposed on the shell base material 3, the colored portion forming material is filled in the concave portion 31, and the colored portion 4 is filled. A colored portion forming step (2e, 2f) for forming the shell, a joining step (2g) for joining the shell base material 3 provided with the colored portion 4 to the substrate 2, and a mask for removing the mask 6 from the shell base material 3 And a removal step (2h). In particular, in this embodiment, in the colored portion forming step, the projection material 8 is projected toward the colored portion forming material 9 in a state where a metal thin film as the colored portion forming material 9 is arranged on the shell base material 3. Thus, the colored portion 4 is formed. That is, it is the same as that of 1st Embodiment mentioned above except the method of a coloring part formation process differing. Hereinafter, the difference from the above-described embodiment will be mainly described.

[Colored part forming step]
In the present embodiment, in the colored portion forming step, the projection material 8 is projected toward the colored portion forming material 9 in a state where the colored portion forming material 9 is disposed on the shell base material 3, so that the inside of the recess 31. Is filled with a coloring portion forming material to form the coloring portion 4 (2e, 2f). By forming the colored portion 4 by such a method, the formation efficiency of the colored portion 4 can be made particularly excellent, and the productivity of the timepiece dial 1 can be made particularly excellent. Further, the colored portion forming material 9 that has not been used for forming the colored portion 4 can be easily recovered and reused.

In particular, in the present embodiment, the colored portion 4 is projected by projecting the projection material 8 toward the colored portion forming material 9 in a state where the metal thin film as the colored portion forming material 9 is arranged on the shell base material 3. Form. Thereby, the formation efficiency of the colored part 4 can be further improved, and the productivity of the timepiece dial 1 can be further improved.
Although the average thickness of the metal thin film as the coloring part forming material 9 is not particularly limited, it is preferably 5 to 250 μm, and more preferably 30 to 200 μm. When the average thickness of the metal thin film is a value within the above range, the ease of handling the colored portion forming material 9 (metal thin film) at the time of manufacturing the timepiece dial 1 is sufficiently excellent. The colored portion 4 having excellent adhesion to the material 3 can be efficiently formed.
The conditions of the projection material 8 and the projection conditions in the colored portion forming step are preferably the same as those in the above-described embodiment.

<< Third Embodiment >>
FIG. 3 is a cross-sectional view showing a third embodiment of the timepiece dial manufacturing method of the present invention.
The manufacturing method of this embodiment includes a shell base material preparation step (3a) for preparing a shell base material 3 on a thin plate made of shells, and a mask for forming a mask 6 in a predetermined pattern on the shell base material 3 A forming step (3b), a recess forming step (3c, 3d) for forming the recess 31 by projecting the projection material 7 onto the shell substrate 3 partially covered with the mask 6, and a colored portion By projecting the projection material 8 toward the colored portion forming material 9 (metal powder) in a state where the metal powder as the forming material 9 is disposed on the shell base material 3, the colored portion is formed in the recess 31. A colored portion forming step (3e, 3f) for filling the material and forming the colored portion 4, a joining step (3g) for joining the shell base material 3 provided with the colored portion 4 to the substrate 2, and the shell base material 3 And a mask removing step (3h) for removing the mask 6 from above. That is, it is the same as that of 1st, 2nd embodiment mentioned above except the method of a coloring part formation process differing. Hereinafter, the difference from the above-described embodiment will be mainly described.

[Colored part forming step]
In this embodiment, in the colored portion forming step, the projection material 8 is directed toward the colored portion forming material 9 (metal powder) in a state where the metal powder as the colored portion forming material 9 is arranged on the shell base material 3. By projecting, the colored portion forming material is filled in the concave portion 31 to form the colored portion 4 (3e, 3f). By forming the colored portion 4 by such a method, the formation efficiency of the colored portion 4 can be made particularly excellent, and the productivity of the timepiece dial 1 can be made particularly excellent. The adhesion of the colored portion 4 to the shell base material 3 can be made particularly excellent. In addition, in the colored portion forming step, for example, by using a squeegee or the like, the selective arrangement of the colored portion forming material 9 in the concave portion 31 of the shell base material 3 can be suitably performed. As a result, it is possible to more reliably prevent the colored portion forming material 9 from adhering to an unintentional portion, and the aesthetic appearance of the timepiece dial 1 can be more reliably improved. .

The average particle size of the metal powder as the colored portion forming material 9 is preferably smaller than the average particle size of the projection material 8. Thereby, the aesthetic appearance of the manufactured timepiece dial 1 can be made particularly excellent while making the adhesion between the shell base material 3 and the colored portion 4 particularly excellent.
Although the average particle diameter of the metal powder as the coloring part forming material 9 is not particularly limited, it is preferably 1 to 250 μm, and more preferably 4 to 100 μm. When the average particle size of the metal powder is within the above range, the ease of handling of the colored portion forming material 9 (metal powder) at the time of manufacturing the timepiece dial 1 is sufficiently excellent. The colored portion 4 having particularly excellent adhesion with the material 3 can be formed more efficiently. Moreover, the aesthetic appearance of the timepiece dial 1 to be manufactured can be further improved.
The conditions of the projection material 8 and the projection conditions in the colored portion forming step are preferably the same as those in the above-described embodiment.

<Watch dial>
Next, the timepiece dial of the present invention will be described.
The timepiece dial 1 is manufactured by the method as described above.
As described above, the timepiece dial 1 is provided with the colored portion 4 in the recess 31 provided in the shell base material 3. Thereby, for example, the colored portion 4 can function as an index or a pattern such as a time letter or a mark, and the aesthetic appearance of the timepiece dial 1 can be made excellent. Moreover, since the coloring part 4 is excellent in visibility, for example, when the coloring part 4 functions as an index, the user can easily and accurately recognize the time, etc. The function is also particularly excellent. Further, since the colored portion 4 is provided so as to enter the recess 31, the adhesion between the shell base material 3 and the colored portion 4 is excellent, and the durability and reliability of the timepiece dial 1 as a whole are also improved. Are better.

Next, the timepiece of the present invention provided with the timepiece dial of the present invention as described above will be described.
The timepiece of the present invention has the timepiece dial of the present invention as described above. As parts other than the timepiece dial (the timepiece dial of the present invention) constituting the timepiece of the present invention, known components can be used. Hereinafter, an example of the configuration of the timepiece of the present invention (substrate 2) Is a solar radio timepiece made of a material having electromagnetic wave permeability such as plastic.

FIG. 3 is a cross-sectional view showing a preferred embodiment of the timepiece (watch) of the present invention.
As shown in FIG. 3, a wristwatch (portable watch) 100 according to the present embodiment includes a case (case) 82, a back cover 83, a bezel (edge) 84, and a glass plate (cover glass) 85. . Further, in the case 82, the timepiece dial 1 of the present invention as described above, the solar cell 94, and the movement 81 are accommodated, and further, hands (pointers) not shown are accommodated. . The timepiece dial 1 is provided between a solar cell 94 and a glass plate (cover glass) 85, and the surface (first surface) on which the colored portion 4 of the shell base material 3 is provided is glass. It arrange | positions so that it may face the board (cover glass) 85 side.

The glass plate 85 is usually made of transparent glass or sapphire having high transparency. Thereby, while being able to fully exhibit the aesthetics of the timepiece dial 1 of the present invention, a sufficient amount of light can be incident on the solar cell 94.
The movement 81 uses the electromotive force of the solar cell 94 to drive the pointer.
Although omitted in FIG. 6, in the movement 81, for example, an electric double layer capacitor for storing the electromotive force of the solar cell 94, a lithium ion secondary battery, a crystal oscillator as a time reference source, and a crystal vibration A semiconductor integrated circuit that generates a driving pulse for driving a clock based on the oscillation frequency of the child, a step motor that drives the pointer every second in response to this driving pulse, and a wheel that transmits the movement of the step motor to the pointer A row mechanism is provided.

The movement 81 includes a radio wave receiving antenna (not shown). And it has the function to perform time adjustment etc. using the received electromagnetic wave.
The solar cell 94 has a function of converting light energy into electric energy. The electric energy converted by the solar cell 94 is used for driving the movement.
In the solar cell 94, for example, a p-type impurity and an n-type impurity are selectively introduced into a non-single-crystal silicon thin film, and a p-type non-single-crystal silicon thin film and an n-type non-single-crystal silicon thin film are used. It has a pin structure provided with an i-type non-single-crystal silicon thin film with a low impurity concentration in between.

A winding stem pipe 86 is fitted into and fixed to the barrel 82, and a shaft 871 of a crown 87 is rotatably inserted into the winding stem pipe 86.
The body 82 and the bezel 84 are fixed by a plastic packing 88, and the bezel 84 and the glass plate 85 are fixed by a plastic packing 89.
Further, a back cover 83 is fitted (or screwed) to the body 82, and a ring-shaped rubber packing (back cover packing) 92 is inserted in a compressed state in these joint portions (seal portions) 93. Has been. With this configuration, the seal portion 93 is sealed in a liquid-tight manner, and a waterproof function is obtained.

  A groove 872 is formed on the outer periphery of the middle portion of the shaft portion 871 of the crown 87, and a ring-shaped rubber packing (crown packing) 91 is fitted in the groove 872. The rubber packing 91 is in close contact with the inner peripheral surface of the winding stem pipe 86 and is compressed between the inner peripheral surface and the inner surface of the groove 872. With this configuration, the space between the crown 87 and the winding stem pipe 86 is liquid-tightly sealed, and a waterproof function is obtained. When the crown 87 is rotated, the rubber packing 91 rotates together with the shaft portion 871 and slides in the circumferential direction while being in close contact with the inner peripheral surface of the winding stem pipe 86.

Since the above portable watch (watch) is required to have particularly excellent durability (for example, impact resistance, etc.) among various types of watches, a book with excellent aesthetic appearance and excellent durability can be obtained. The invention can be applied more suitably.
In the above description, a wristwatch (portable clock) as a solar radio timepiece has been described as an example of a clock. However, the present invention is applicable to other types of clocks such as a portable clock, a table clock, and a wall clock other than a wristwatch. Can be applied similarly. Further, the present invention can be applied to any timepiece such as a solar timepiece excluding a solar radio timepiece and a radio timepiece excluding a solar radio timepiece.
As mentioned above, although preferred embodiment of this invention was described, this invention is not limited to these.

For example, in the method for manufacturing a timepiece dial according to the present invention, an optional process can be added as necessary. For example, you may add the process of forming a coat layer in the surface side in which the coloring part of the shellfish base material was provided for the purpose of adhesion prevention of dirt, durability improvement, aesthetics improvement, etc. Such a coat layer may be removed, for example, when a timepiece dial is used.
Moreover, in the manufacturing method of this invention, you may replace the order of each process mentioned above suitably. For example, the shell base material and the substrate may be joined prior to the formation of the concave portion and the colored portion. For example, the mask removal step may be performed prior to the joining of the shell base material and the substrate.

Moreover, in the manufacturing method of this invention, you may abbreviate | omit a part of process demonstrated by embodiment mentioned above. For example, the mask removal process and the mask formation process may be omitted.
Further, the colored portion forming step may be performed by a method other than the method described in the first to third embodiments. For example, the colored portion forming step may be performed by a vapor deposition method or the like.
In the above-described embodiment, the timepiece dial has been described as having a substrate. However, the timepiece dial may not have a substrate. More specifically, the timepiece dial of the present invention may be composed of a shell base material and a colored portion, for example.

Next, specific examples of the present invention will be described.
1. Manufacture of timepiece dial (Example 1)
100 clock dials (watch dials) were manufactured for each example and each comparative example by the method as described below.
First, a shell base material having a diameter of 20 mm × thickness: 200 μm was formed from a white butterfly shell by press processing (shell base material preparation step).

Next, this shellfish substrate was washed. As the shell substrate cleaning, pure water ultrasonic cleaning was performed for 5 minutes.
Next, a resist material was applied to one surface of the washed shellfish substrate by a roll coater to form a mask forming film. Thereafter, exposure and development processes were performed to form a mask having a predetermined pattern (mask formation process). The average thickness of the formed mask was 10 μm.
Next, the projection material was projected onto the side of the shell base material on which the mask was provided, thereby forming a recess corresponding to the mask pattern (reverse pattern) on the shell base material (recess formation step). As the projection material, an alumina powder having an average particle diameter of 60 μm was used. Moreover, the injection pressure of the projection material was 3.5 kgf / cm ² . The average depth of the recess formed in this step was 80 μm. The average width of the recesses was 480 μm. Further, the surface roughness Ra of the inner surface of the recess (surface roughness Ra of the processed surface) was 4.0 μm.

Next, the colored part was formed in the recessed part of a shellfish base material by projecting the mixture of a projection material and a colored part formation material toward a shellfish base material (coloring part part formation process). As the colored part forming material, Au powder having an average particle diameter of 100 nm was used. As the projection material, an alumina powder having an average particle size of 10 μm was used as the colored portion forming material. Moreover, the injection pressure of the projection material was adjusted to 2.0 kgf / cm ² . Moreover, the average thickness of the formed colored part was 60 μm.
On the other hand, a base material having the shape of a timepiece dial (watch dial) was produced by compression molding using polycarbonate, and then necessary portions were cut and polished. The obtained base material was substantially disk-shaped and had a diameter of 30 mm × thickness: 300 μm.

Next, this base material was washed. As the cleaning of the substrate, first, alkali immersion degreasing was performed for 30 seconds, and then neutralization was performed for 10 seconds, water washing for 10 seconds, and pure water cleaning for 10 seconds.
The base material thus cleaned and the shell base material (shell base material provided with a colored portion) obtained as described above were bonded together using an adhesive (joining step). At this time, the surface of the shell substrate opposite to the surface provided with the colored portion was made to face the substrate.
Thereafter, the 2.36 wt% tetramethylammonium hydroxide aqueous solution was used to peel and remove the mask from the shellfish base material (mask removal step). As a result, a timepiece dial was obtained.

(Examples 2 to 6)
A timepiece dial was manufactured in the same manner as in Example 1 except that the manufacturing conditions were changed as shown in Table 1.
(Example 7)
In the colored part forming step, instead of projecting the mixture of the projection material and the colored part forming material toward the shell material, the metal thin film as the colored part forming material is arranged on the shell material, A timepiece dial was manufactured in the same manner as in Example 1 except that the projection material was projected toward the colored portion forming material. As a coloring part forming material (metal thin film), a gold foil (Au thin film) having an average thickness of 60 μm was used.

(Examples 8 to 12)
A timepiece dial was manufactured in the same manner as in Example 7 except that the manufacturing conditions were changed as shown in Table 1.
(Example 13)
In the colored part forming step, instead of projecting the mixture of the projection material and the colored part forming material toward the shell material, the metal powder as the colored part forming material is arranged on the shell material, A timepiece dial was manufactured in the same manner as in Example 1 except that the projection material was projected toward the colored portion forming material (metal powder). As the colored part forming material (metal powder), Au powder having an average particle diameter of 5 μm was used. In addition, in the colored portion forming step, after the colored portion forming material (metal powder) is applied to the surface side where the concave portion of the shell material is provided, the squeegee is used to place the portion other than the concave portion of the shell material. The arranged colored part forming material (metal powder) was removed. That is, the coloring part forming material (metal powder) was selectively present in the concave portion of the shell base material, and then the projection material was projected thereon to form the coloring part.

(Examples 14 to 18)
A timepiece dial was manufactured in the same manner as in Example 13 except that the manufacturing conditions were changed as shown in Table 2.
(Comparative Example 1)
A timepiece dial was manufactured in the same manner as in Example 1 except that the recess forming step was performed by etching.
The shell material was etched by immersing the shell material provided with a mask in 1N hydrochloric acid for 0.5 minutes. The recess forming step is made of the same material as the mask in order to prevent etching from the back side on the back side of the shell substrate (the side opposite to the side where the mask of the predetermined pattern is provided). This was carried out with the back-surface protective film provided. The average thickness of the back protective film was 30 μm.

(Comparative Example 2)
A timepiece dial was manufactured in the same manner as in Example 1 except that the colored portion forming step was omitted.
(Comparative Example 3)
A timepiece dial was manufactured in the same manner as in Example 1 except that the concave portion forming step was omitted and the colored portion forming step was performed by a vacuum deposition method.
Tables 1 and 2 show the manufacturing conditions and the configuration of the timepiece dial of each example and each comparative example. In Tables 1 and 2, the “Method” column of the colored part forming step is “A”, which is a method of projecting a mixture of the projection material and the colored part forming material toward the shell material. In the state where the metal thin film as the part forming material is arranged on the shell base material, the method of projecting the projection material toward the coloring part forming material is “B”, and the metal powder as the coloring part forming material is shell base The method of projecting the projection material toward the colored portion forming material (metal powder) in a state of being arranged on the material is indicated by “C”, and the vacuum deposition method is indicated by “D”. In Tables 1 and 2, the polycarbonate is indicated by “PC” and the acrylonitrile-butadiene-styrene copolymer is indicated by “ABS”.

2. Appearance evaluation of timepiece dials Each timepiece dial produced in each of the above Examples and Comparative Examples was visually and microscopically observed, and the appearance was evaluated according to the following four-stage criteria.
A: Appearance is excellent.
B: Appearance is good.
C: Appearance is slightly poor.
D: Appearance defect.

3. 3. Evaluation of durability 3-1. Thermal cycle test Each timepiece dial was subjected to the following thermal cycle test.
First, the watch dial is placed in a 20 ° C. environment for 1 hour, then in a 70 ° C. environment for 2 hours, then in a 20 ° C. environment for 1 hour, and then in a −25 ° C. environment for 2 hours. Left to stand. Thereafter, the environmental temperature was returned again to 20 ° C., which was set as one cycle (6 hours), and this cycle was repeated a total of 4 times (total 24 hours).
Thereafter, the appearance of the timepiece dial was visually observed, and the appearance was evaluated according to the following four-stage criteria.
A: The floating of the colored part and the crack of the shell base material are not recognized at all.
B: Floating colored portions and cracks in the shell base material are hardly observed.
C: The float of a coloring part or the crack of a shell base material is recognized clearly.
D: Peeling of the colored part or cracks are clearly recognized in the shell material.

3-2. Impact Test Each timepiece dial was dropped from a height of 1.8 m onto a stainless steel plate having a thickness of 3 cm 100 times in succession.
Thereafter, the appearance of the timepiece dial was visually observed, and the appearance was evaluated according to the following four-stage criteria.
A: The floating of the colored part and the crack of the shell base material are not recognized at all.
B: Floating colored portions and cracks in the shell base material are hardly observed.
C: The float of a coloring part or the crack of a shell base material is recognized clearly.
D: Peeling of the colored part or cracks are clearly recognized in the shell material.

4). Evaluation of radio wave permeability The radio wave permeability of each timepiece dial manufactured in each of the above Examples and Comparative Examples was evaluated by the following method.
First, a watch case and a wristwatch internal module (movement) equipped with an antenna for receiving radio waves were prepared.
Next, a wristwatch internal module (movement) and a wristwatch dial were assembled in the watch case, and the radio wave reception sensitivity in this state was measured. At this time, the timepiece dial was set so that the surface of the substrate to which the shell base material was bonded faced the outer surface.

Based on the reception sensitivity in a state where the wristwatch dial is not incorporated, the reduction amount (dB) of the reception sensitivity when the wristwatch dial is incorporated was evaluated according to the following four criteria. It can be said that the lower the radio wave reception sensitivity is, the better the radio wave transmission of the wristwatch dial is.
A: No decrease in sensitivity is observed (below the detection limit).
B: A decrease in sensitivity is observed at less than 0.7 dB.
C: The decrease in sensitivity is 0.7 dB or more and less than 1.0 dB.
D: The decrease in sensitivity is 1.0 dB or more.

5. Evaluation of light transmittance The light transmittance of each dial for wristwatch manufactured in each of the above Examples and Comparative Examples was evaluated by the following method.
First, the solar cell and each watch dial were placed in a darkroom. Thereafter, light from a white fluorescent lamp (light source) separated by a predetermined distance was made incident on the light receiving surface of the solar cell alone. At this time, the power generation current of the solar cell was A [mA]. Next, light from a white fluorescent lamp (light source) separated by a predetermined distance as described above was made incident on the upper surface of the light receiving surface of the solar cell with a wristwatch dial overlapped. In this state, the generated current of the solar cell was B [mA]. Then, the light transmittance of the timepiece dial represented by (B / A) × 100 was calculated and evaluated according to the following four criteria. It can be said that the larger the light transmittance, the better the light transmittance of the timepiece dial. The timepiece dial was superposed on the solar cell so that the surface of the substrate to which the shell base material was joined faced the white fluorescent lamp (light source). Further, as the white fluorescent lamp, a white fluorescent lamp (manufactured by Toshiba, fluorescent lamp for inspection FL20S-D65) was used.

A: 33% or more.
B: 27% or more and less than 33%.
C: 19% or more and less than 27%.
D: Less than 19%.
These results are shown in Table 3.

As is clear from Table 3, each of the timepiece dials of the present invention had excellent aesthetic appearance and durability. Moreover, all were excellent in the transmittance | permeability of electromagnetic waves (light, radio waves). On the other hand, in the comparative example, a satisfactory result was not obtained.
Further, a timepiece as shown in FIG. 5 was assembled using the timepiece dials obtained in the respective examples and comparative examples. Each timepiece thus obtained was tested and evaluated in the same manner as described above, and the same results as described above were obtained.

It is sectional drawing which shows 1st Embodiment of the manufacturing method of the timepiece dial shown in FIG. It is sectional drawing which shows 2nd Embodiment of the manufacturing method of the timepiece dial shown in FIG. It is sectional drawing which shows 3rd Embodiment of the manufacturing method of the timepiece dial shown in FIG. It is sectional drawing which shows suitable embodiment of the timepiece dial of this invention. It is a fragmentary sectional view which shows suitable embodiment of the timepiece (portable timepiece) of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Timepiece dial 2 ... Board | substrate 3 ... Shell base material 31 ... Recessed part 4 ... Colored part 6 ... Mask 7 ... Projection material 8 ... Projection material 9 ... Colored part formation material 81 ... Movement 82 ... trunk | drum (case) 83 ... Back cover 84 ... Bezel (edge) 85 ... Glass plate (cover glass) 86 ... Winding pipe 87 ... Crown 871 ... Shaft portion 872 ... Groove 88 ... Plastic packing 89 ... Plastic packing 91 ... Rubber packing (crown packing) 92 ... Rubber packing (back cover packing) 93 ... Joint part (seal part) 94 ... Solar cell 100 ... Watch (portable watch)

Claims (14)

A concave portion forming step for forming a concave portion by projecting a projection material on a shell base material composed of shells,
A colored portion forming step of filling the recessed portion with a colored portion forming material to form a colored portion, and a method for manufacturing a timepiece dial.   2. The timepiece dial manufacturing method according to claim 1, wherein the colored portion forming step is performed by projecting a mixture of a projection material and the colored portion forming material toward the shell base material. 3.   The timepiece dial manufacturing method according to claim 2, wherein the colored portion forming material is fine particles having an average particle diameter of 500 nm or less.   4. The timepiece dial manufacturing method according to claim 2, wherein an injection pressure of the projection material in the colored portion forming step is smaller than an injection pressure of the projection material in the recess forming step. 5.   5. The timepiece dial according to claim 2, wherein an average particle size of the projection material used in the colored portion forming step is smaller than an average particle size of the projection material used in the concave portion forming step. Manufacturing method. 6. The timepiece dial manufacturing method according to claim ² , wherein an injection pressure of the projection material in the colored portion forming step is 0.5 to 2.5 kgf / cm ² .   The method for manufacturing a timepiece dial according to claim 2, wherein an average particle diameter of the projection material used in the colored portion forming step is 5 to 25 μm.   2. The colored portion forming step is performed by projecting a projection material toward the colored portion forming material in a state where the colored portion forming material is arranged on the shell base material. Of manufacturing a dial for a watch.   The timepiece dial manufacturing method according to claim 8, wherein the coloring portion forming material is a metal thin film.   The timepiece dial manufacturing method according to claim 8, wherein the colored portion forming material is a metal powder. 11. The timepiece dial manufacturing method according to claim 1, wherein an injection pressure of the projection material in the recess forming step is 2.0 to 5.0 kgf / cm ² .   The method for manufacturing a timepiece dial according to claim 1, wherein an average particle diameter of the projection material used in the recess forming step is 40 to 80 μm.   A timepiece dial manufactured using the method according to claim 1.   A timepiece comprising the timepiece dial according to claim 13.

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