Decorative article having black hard coating film
AssigneeCitizen Watch Co., Ltd.
InventorOsamu Tanaka
Life of this patent
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Abstract
Provided is a decorative article including a black hard coating film which is excellently inhibited from suffering a deterioration of appearance quality such as a scratch due to use thereof, and which has excellent decorativeness. The decorative article according to the present invention is a decorative article including: a base; and a black hard coating film which is formed on the base, and which includes diamond-like carbon, wherein the hydrogen content of a surface, reverse to a surface closer to the base, of the black hard coating film is more than the hydrogen content of the surface, closer to the base, of the black hard coating film; and the hydrogen content of the surface, reverse to the surface closer to the base, of the black hard coating film is 30.0 to 75.0 atm %.
Claims9
An article comprising a decorative article,
- the decorative article comprising:
- a base;
- and a black hard coating film which is formed on the base, and which comprises diamond-like carbon,
- wherein a hydrogen content of a surface, reverse to a surface closer to the base, of the black hard coating film is more than a hydrogen content of the surface, closer to the base, of the black hard coating film;
- and the hydrogen content of the surface, reverse to the surface closer to the base, of the black hard coating film is 30.0 to 75.0 atm %, and
- wherein the article comprising the decorative article is a timepiece, a necklace, a pendant, a brooch, or glasses.
A method for producing an article comprising a decorative article comprising a base and a black hard coating film which is formed on the base, and which comprises diamond-like carbon,
- the method comprising a black hard coating film formation step of forming the black hard coating film by a plasma CVD method, wherein
- in the black hard coating film formation step, the black hard coating film is formed so that a hydrogen content of a surface, reverse to a surface closer to the base, of the black hard coating film is more than a hydrogen content of the surface, closer to the base, of the black hard coating film, and the hydrogen content of the surface, reverse to the surface closer to the base, of the black hard coating film is 30.0 to 75.0 atm %,
- wherein the article comprising the decorative article is a timepiece, a necklace, a pendant, a brooch, or glasses.
Dependencies are inferred from the claim text.