JPH0675061A - Manufacture of dial for wrist watch - Google Patents

Abstract

PURPOSE:To obtain a dial of novel design at low cost by forming a colored transparent resin layer, in turtleback shape, on the top surface of a protrusion such as a character mark on the dial for wrist watch. CONSTITUTION:A surface pattern is formed through machining on a dial base 1 and a nonconductive film layer, i.e., a paint layer 2, is formed thereon. Such parts as corresponding to character, abbreviation, mark, and the like are then embossed and superficial film is removed therefrom. Furthermore, a part where a conductive underlying metal layer is exposed is cut partially to form a groove and a resin layer 3 is formed therein. The resin layer 3 and the outside metal layer are then polished to provide a flush plane thus forming a colored transparent resin layer 4 of turtleback shape on the top surface of the resin layer 3 and the metal layer.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method of manufacturing a dial for a wristwatch.

[0002]

2. Description of the Related Art Conventionally, a dial plate for a wristwatch has a material such as radial eyes, vertical eyes, etc. applied to a cloth, plating, painting, etc., and letters are planted on the dial. Although this method can obtain a three-dimensional dial, it has the disadvantages that the number of processing steps is large and the cost is high because the letters are formed as a separate body and are embedded in the base.

As a method for saving the time and effort for implanting characters, a surface pattern is formed on a dial base by machining, and a portion to be a character is projected by a mold to form a protrusion, and the protrusion is cut with a diamond tool or the like. There is a method of forming a character shape by doing so, and finally plating the character portion as needed to form a dial (hereinafter referred to as the WD method).

However, most of the dials made by the WD method are simple, because the finish of the character portion is mainly plating. Further, conventionally, there has been a method of forming a color resin layer, but there are many simple methods of forming a color resin layer on a metal layer.

[0005]

SUMMARY OF THE INVENTION According to the present invention, the letters, abbreviations, marks, etc. of a dial for a wristwatch are easily formed by the WD method, and the letters, abbreviations, marks with a unique three-dimensional colored transparent resin layer finish are formed. Etc., expand the variety of designs, and try to create a dial with jewel-like decoration at a low cost and with a short delivery time.

[0006]

According to the present invention, a surface pattern is formed on a dial plate base by machining, plating is applied if necessary, and a non-conductive film layer is formed by coating on the surface pattern by the WD method. The letters, abbreviations, marks, etc. are projected. Only the projected characters, abbreviations, marks, etc. are cut and removed with a diamond tool to expose the underlying metal layer. Furthermore, a part of the exposed portion of the conductive underlying metal layer is further cut with a diamond bite or the like to form a groove. A resin layer is formed in the groove and is polished so that the metal layer outside the groove and the resin layer in the groove are flush with each other. A three-dimensionally colored transparent resin layer is formed on the resin layer and the metal layer to be colored.

As the material of the dial base, brass, nickel silver, etc. are usually used. The resin applied to the dial surface is usually a thermosetting resin such as an acrylic resin or an epoxy resin, which is applied by spray coating or the like and heated to form a coating layer. As a method of removing the non-conductive coating layer, a method of cutting with a cutting tool was used, but another method is also possible.

A gem-like appearance can be obtained by combining the resin layer on the upper surface of the protruding, plated letters, abbreviations, marks and the like, the metal layer and the three-dimensional colored transparent resin layer.

[0009]

[Operation] Through the above steps, it is possible to easily obtain a dial plate with a variety of bright letters, abbreviations, marks, etc., depending on the combination of the reflected light of the resin layer and the metal layer and the color tone of the round transparent resin layer. be able to.

[0010]

【Example】

(Example 1) The present invention will be described in detail below with reference to examples. FIG. 1 is a cross-sectional view of a wristwatch dial according to a first embodiment of the present invention, and FIG. 2 is a cross-sectional view showing respective steps of a wristwatch dial manufacturing method according to the first embodiment of the present invention.

(A) The dial plate base 1 was formed of a brass plate having a thickness of 0.3 mm, and radial basis weight was applied. Nickel plating and silver plating were applied on the dial plate base 1 and then clear coating was applied to form a coating layer 2 which is a non-conductive coating layer. (B) Depending on the type, parts that should become letters, abbreviations, and marks were made to protrude.

(C) The coating layer 2 in the shape of a protruding letter was cut off from the coating layer 2 with a diamond bite to expose the conductive base metal surface of the dial base 1. (D) A part of the metal surface cut and removed with a diamond bite was further cut with a diamond bite to form a groove.

(E) Further, the resin 3 was dropped into the groove and cured by heating. (F) The resin in the groove and the metal layer on the outside were polished to finish on the same plane. (G) A colored transparent resin in which a transparent epoxy paint mixed with a red pigment is dripped on the resin layer 3 in the groove and the outer metal layer with a syringe and raised in a round shape by utilizing surface tension. Layer 4 was formed.

The resin layer 3 and the metal layer can be seen through the round transparent resin layer 4 of red color, and a jewel-like appearance can be obtained. As the color tone of the transparent resin layer, blue, yellow, green or other colors can be used by changing the pigment.

(Embodiment 2) FIG. 3 is a sectional view showing another embodiment of the wristwatch dial according to the present invention. After the resin layer and the metal layer were polished to the same plane in the step (F) of FIG. 2, the plating layer 5 was attached to the metal surface, and the colored transparent resin layer 4 was formed in the step (G).

As the plating, silver plating, gold plating, rhodium plating or the like can be used. The plating can further increase the variety of metal parts.

[0017]

As described in the above embodiments, according to the present invention, the letters, abbreviations, etc. of the dial for a wristwatch can be easily three-dimensional and the unique dial made of a combination of resin and metal and transparent resin on the upper surface. Can be obtained and the design variety can be expanded.

[Brief description of drawings]

FIG. 1 is a sectional view of a wristwatch dial according to the present invention.

2 (A) to (G) are cross-sectional views showing respective steps of a method of manufacturing a wristwatch dial according to the present invention.

FIG. 3 is a sectional view showing another embodiment of the wristwatch dial according to the present invention.

[Explanation of symbols]

 1 dial base 2 coating layer 3 resin layer 4 transparent resin layer 5 plating layer

Claims (2)

[Claims] 1. A non-conductive coating layer is formed on a dial plate base by painting, and then letters, abbreviations, marks, etc. are made to protrude by a mold, and only the non-conductive coating on the protruding portions of letters, abbreviations, marks, etc. To remove the conductive base metal, form a groove in a part of the conductive base metal, form a resin layer in the groove, and polish the resin layer and the outer metal layer to be flush with each other. Then, a method for producing a wristwatch dial is characterized in that an instep-shaped colored transparent resin layer is formed on the upper surfaces of the resin layer and the metal layer. 2. A resin layer is formed in the groove, the resin layer and the outer metal layer are polished to be flush with each other, the exposed metal layer is plated, and the upper surface of the resin layer and the plated layer is rounded. The method for manufacturing a wristwatch dial according to claim 1, wherein a colored transparent resin layer is formed.