Citizen Watch Company, Ltd.

Citizen Holdings Company, Ltd.

Yukio Tanokura

Yukio Miya

Koichi Naoi

Fumio Tase

Kazumi Hamano

Takeshi Inoue

Shinji Ikeda

Hachirou Kushida

Kenji Hanai

Yoshitugu Andou

Akira Meguro

Yosuke Matsumoto

A personal ornament having an ornament base article made of a metal or the like; an underlayer, preferably nickel-free, formed on the base article; and a coloring layer constituted of an abrasion-resistant layer of 0.2-1.5 &#x3bc;m thick formed by dry-plating on the surface of the underlayer and an outermost layer of 0.002-0.1 &#x3bc;m thick formed by dry-plating on the surface of the abrasion-resistant layer. The coloring layer is a white hard coating film of a stainless-steel color which provides superior quality, high resistance to deterioration of appearance by scratching, and a high-quality image like a stainless steel film.

Decorative article having a white coating

The present invention provides personal ornaments having as an outermost layer a white ornamental coating film having platinum or a platinum alloy formed by dry-plating, including: an ornament base article made of a metal or ceramic, an underlayer formed on the surface on the base article, an abrasion resistant layer formed on the surface of the underlayer by dry-plating, and an ornamental coating layer having platinum or platinum alloy formed on the surface of the abrasion resistant layer by dry-plating. Also, the present invention provides personal ornaments having a coloring layer including an abrasion-resistant layer, a mixture layer and an outermost layer, the outermost layer being a white hard coating film having a noble metal or a noble metal alloy formed by dry-plating on the surface of the mixture layer.

Decorative article having white coating and method for manufacture thereof

A decorative item and method for making same, such as an exterior part of a timepiece, wristwatch band and the like, includes a basis material of stainless steel having a carburized hardened later thereon in which carbon is diffused so as to form a solid solution in which crystalline chromium carbide is not formed and at least one hard coating is deposited on the carburized hardened layer of basis material, wherein the hard coating has a surface hardness greater than that of the carburized layer.

Decorative item and process for producing the same

Decorative member

Growing community of inventors

Tokyo, Japan

Yukio Tanokura