JPH04115187A - Manufacture of dial plate for wrist watch - Google Patents

Abstract

PURPOSE:To expand a design variety by a method wherein a nonconductive film layer is formed on a dial plate base, parts of characters and others are made to product thereafter, a plating layer is formed only on the lateral side of the projecting part and further printing is made on the top surfaces of the characters and others. CONSTITUTION:A character base 1 is formed of a brass plate about 0.3mm thick, for instance and radial graduation is conducted. Thereafter nickel plating and silver plating are applied on this base 1 and clear coating is applied to form a coating layer 2. Next, parts to form abbreviations are made to project by a die and sheared surfaces of the projecting parts are exposed to such an extent that the coating layer 2 is absent there completely. Nickel plating and gold plating are applied on a dial plate thus prepared, so as to form a plating layer 3. Moreover, a blue printed layer 4 is formed on the top surfaces of the projecting abbreviations. By this method, the lateral sides and the top surfaces of the abbreviations projecting one the silver surface of the dial plate can be made gold and blue respectively, for instance.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method for manufacturing a wristwatch dial.

[Summary of the Invention] The present invention involves forming a surface pattern on a dial base by machining, plating if necessary, and coating the pattern to form a non-conductive film layer. , etc., and plate only the exposed part of the conductive base metal layer on the side of the protruding part, and then print on the upper surface of the convex letters, abbreviations, marks, etc. to create a dial with a new design. That's what you're trying to get.

[Prior Art] Conventionally, wristwatch dials have been made by applying a radial opening, vertical grain, etc. to fabric, plating, painting, etc., and then planting letters on top of the fabric. Although this method allows a three-dimensional dial to be obtained, the disadvantage is that the characters are made separately and then embedded into the base, which requires a large number of processing steps and increases costs.

As a method to save the trouble of embedding letters, a surface pattern is formed by machining on the dial base, the part that should become the letters is made to protrude using a mold, and the shape of the letters is created by cutting these protrusions with a diamond cutting tool. Finally, if necessary, there is a method of plating the text to form a dial. (Hereinafter, referred to as the WD method.) However, the finishing of the character portions of the dials produced using the WD method was mainly done by plating, and many of them were simple.

[Problem to be Solved by the Invention 1] The present invention solves the problem of changing the characters, abbreviations, marks, etc. of a wristwatch dial to W.
The purpose is to expand the variety of designs by easily forming dial plates using the D method, and by changing the color tones of the side and top surfaces of letters, abbreviations, marks, etc., and to produce dial plates at low cost and in a short delivery time.

[Means for Solving the Problems] The present invention involves forming a surface pattern on a dial base by machining, applying plating if necessary, and coating it to form a non-conductive film layer, and applying the WD method. Make characters, abbreviations, marks, etc. stand out. Protruding letters, abbreviations,
By protruding the sides of the marks, etc., a shearing force is applied and the base metal layer is exposed. The exposed side surfaces of the conductive base metal layer are plated, and the plated layer is formed only on the side surfaces of the protruding portions to metallize them. The upper surface of protruding characters, abbreviations, marks, etc. can be further colored by printing or the like.

Brass, nickel silver, etc. are usually used as the material for the dial base.

The resin to be coated is usually a thermosetting resin such as acrylic resin or epoxy resin, which is applied by spray coating or the like and heated to form a coating layer.

The exposed metal surface of the side surface of the convex valve is plated with a non-conductive coating layer, and in the present invention, gold plating, rhodium plating, etc. are used.

The upper surface of protruding characters, abbreviations, marks, etc. can be further colored by printing or the like.

[Operation] Through the above steps, only the side surfaces of letters, abbreviations, marks, etc. formed three-dimensionally on the dial plate can be easily metallized.

[Example 1] The present invention will be explained in detail below with reference to Examples.

FIG. 1 is a cross-sectional view of a wristwatch dial according to Embodiment 1 of the present invention;
FIG. 2 is a cross-sectional view showing each step of the method for manufacturing a wristwatch dial according to Example 1 of the present invention.

(A) The dial base 1 is made of a brass plate with a thickness of 0.3 mm, and after applying nickel plating and silver plating on the 0 dial base 1 with a radial basis weight, applying Knorr painting to the paint layer 2. did.

(B) The part that should be an abbreviation was made to protrude in a convex shape by the mold. The coating layer 2 is removed from the sheared surface of the protruding portion, and the metal surface is exposed.

(C) Nickel plating and gold plating were applied to this dial plate to form plating layer 3.

(D) A blue printed layer 4 was further formed on the upper surface of the protruding abbreviations.

The sides of the abbreviations protruding from the silver dial surface were gold colored, and the top surface was colored blue.

Gold, gray, or other color plating can also be used as the plating layer on the dial surface.

[Example 2] (A) A radial basis weight was applied to the dial base l, and nickel plating was applied. A white coating was applied on the plating layer to form coating layer 2.

(B) The part that should be an abbreviation was made to protrude in a convex shape by the mold. The coating layer 2 is removed from the sheared surface of the protruding portion, and the metal surface is exposed.

(C) Nickel plating and rhodium plating were applied to this dial plate to form plating layer 3.

(DJ) Furthermore, a black printed layer 4 was formed on the upper surface of the protruding abbreviations.

It was possible to create abbreviations on a white dial surface with silver sides and black tops.

〔Effect of the invention〕

As described in the embodiments above, according to the present invention, the letters, abbreviations, etc. on the wristwatch dial can be easily made three-dimensional and the side and top surfaces can be made in different colors, making it possible to obtain a unique dial. can. In addition, even thin letters can be precisely formed, expanding the variety of designs, and can be produced in a short delivery time and at low cost.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a wristwatch dial according to the present invention. Figure 2 (A) (D) teeth, Wrist time according to the invention FIG. 3 is a cross-sectional view showing each step of a method for manufacturing a meter dial. dial base ・Paint layer ・Plating layer ・Printing layer Below Up a applicant Seiko Electronic Industries Co., Ltd.

Claims (1)

[Claims] After forming a non-conductive film layer on the dial base by painting, parts such as letters, abbreviations, marks, etc. are made to protrude in a convex shape using a mold, and the base metal layer is removed by shearing the sides of the protruding parts such as letters, abbreviations, marks, etc. A method for producing a wristwatch dial plate, which comprises plating the exposed surface of the dial to form a plating layer only on the side surfaces of the protruding parts, and further printing protruding characters, abbreviations, marks, etc. on the upper surface.