Citizen Watch Company, Ltd.

Citizen Holdings Company, Ltd.

Other

Yukio Miya

Osamu Sugiyama

Takashi Toida

Ryota Koike

Toshiichi Sekine

Koichi Naoi

Fumio Tase

Takanori Nanya

Yuji Fukazawa

Yoshitsugu Shibuya

Osamu Tanaka

Yukio Tanokura

Kazunari Kume

Katsuo Nishimura

Yasuhiro Koizumi

Yasuhiro Ogura

Hisao Wakabayashi

Yutaka Fukumura

Sosaku Kimura

Shinji Ikeda

Junji Sato

Shigeru Kizaki

Shotaro Shimizu

Takatoshi Osaka

Kazumi Hamano

Kouichi Nose

Hidefumi Kasai

Mitsugu Enomoto

Yuh Yasuda

Shirou Takigawa

Hachirou Kushida

Mitugu Enomoto

Akiyoshi Takagi

Hideo Shinomiya

Takanobu Hori

Sigeru Kizaki

Kunihiko Kokubo

Masayoshi Ushikubo

Hiroshi Tagawa

Akiteru Hatayama

A decorative part and a process for producing the decorative part. A first nitride layer containing at least one metal selected among hafnium, titanium, and zirconium is formed on the surface of a decorative part comprising a soft base made of a material selected among stainless steel, titanium and titanium alloys, brass, etc., and a second nitride layer containing at least one metal which is selected among hafnium, titanium, and zirconium and is different from that in the first nitride layer is formed on the first nitride layer to thereby form a primer layer. A multilayered hardened layer including a gold alloy layer is further formed as a finish layer on the primer layer.

Decorative part and process for producing the same

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

A golden ornament includes a base material; a Ti coating film which is formed on a surface of the base material in an atmosphere of an inert gas other than nitrogen and whose Ti atom content is constant in the thickness direction; a TiN gradient coating film which is formed on the Ti coating film and whose N atom content has a gradient in the thickness direction; a TiN coating film which is formed on the TiN gradient coating film and whose contents of Ti atoms and N atoms are constant in the thickness direction; an Au&#x2014;TiN mixture gradient coating film which is formed on the TiN coating film and whose Au atom content has a gradient in the thickness direction; and an Au&#x2014;TiN mixture coating film which is formed on the Au&#x2014;TiN mixture gradient coating film and whose contents of Au atoms, Ti atoms, and N atoms are constant in the thickness direction. The golden ornament may further include an Au coating film or an Au alloy coating film which is formed on the Au&#x2014;TiN mixture coating film and whose Au atom content is constant in the thickness direction.

Golden ornament and process for producing the same

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

Tableware of Ti or a Ti alloy having a surface hardened layer comprising a first hardened layer in which nitrogen and oxygen are diffused so as to form a solid solution and a second hardened layer which is formed in a region deeper than the first hardened layer. The substrate may have a hard decorative coating film. A substrate comprising Ti or a Ti alloy has on its surface an internal hardened layer comprising a first hardened layer and a second hardened layer, wherein the hard decorative coating film is formed on the surface of the internal hardened layer. The cutlery comprises a working part and a grip, the grip provided with a floating means such as a hollow part. Titanium tableware having excellent long-term mar resistance and high quality appearance, increasing the decorative value of the tableware. Further, a process for surface treatment to obtain the titanium tableware with high productivity and a substrate having a hard decorative coating film with excellent mar resistance and high surface hardness. The cutlery is lightweight, mar-resistant and can be easily handled.

Tableware and method for surface treatment thereof, substrate having hard decorative coating film and method for production thereof

The present invention includes a personal ornament having a white coating layer and a method for making the same. The base article is made of metal and the white-colored stainless steel coating layer is formed by a dry plating process. The base metal may be ferrous or non-ferrous.

Decorative article having white film and production method therefor

An arc evaporator comprises: an anode; an evaporation source electrode as a cathode; and a current control unit for supplying an AC square wave arcing current across the anode and the evaporation source electrode.

Arc evaporator, method for driving arc evaporator, and ion plating apparatus

A cavity ( ) for a mold for molding a resin is formed by a fixed mold ( ) and a moving mold ( ), and a diamond-like carbon film ( ) is formed on at least at a part to be contacted with a stamper ( ) on a surface ( ) of the mold ( ) to which the stamper ( ) is attached with an intermediate layer ( ) made of silicon, tungsten, titanium carbide, silicon carbide, chromium carbide, or the like which improves adhesion to the surface ( ) of the mold ( ) interposed in-between to drastically increase useful life of the mold for molding a resin and also increase useful life of the stamper without causing damage thereto.

Resin molding mold

A hard carbon film ( ) is formed directly or through an intermediate layer for enhancing adhesion over an inner surface ( ) of a guide bush ( ) for holding a workpiece ( ) rotatably and axially slidable on an automatic lathe at a position near a cutting tool, to be in sliding contact with the workpiece ( ) or directly or through an intermediate layer for enhancing adhesion on the surface of a superhard lining fixed to the inner surface ( ). The guide bush ( ) has remarkably enhanced durability and prevents damaging the workpiece ( ) and seizing that makes a machining operation impossible even when the guide bush ( ) is used for an extended period of time and when the automatic lathe operates for heavy machining. The hard carbon film ( ) having satisfactory adhesion to the inner surface ( ) can be efficiently formed in a uniform thickness over the inner surface ( ) by placing the guide bush ( ) in a vacuum vessel, extending an auxiliary electrode in the center bore of the guide bush ) and producing a plasma of a gas containing carbon.

Guide bush and method of forming hard carbon film over the inner surface of the guide bush

The invention provides a guide bush wherein a cemented carbide alloy containing at least cobalt is provided on an inner surface thereof for holding a workpiece rotatably and slidably in the longitudinal axial direction thereof in close proximity of a cutting tool, and a DLC film is formed over the cemented carbide alloy, cobalt being removed from the surface of the cemented carbide alloy, adjoining the DLC film. By forming the DLC film on the surface of the cemented carbide alloy from which cobalt has been removed, with an intermediate layer formed therebetween, adhesiveness of the DLC film against the cemented carbide alloy fixedly attached to the inner surface of the guide bush is further enhanced.

Guide bush and method of forming diamond-like carbon film over the guide bush

The invention provides a guide bush wherein a cemented carbide alloy containing at least cobalt is provided on an inner surface thereof for holding a workpiece rotatably and slidably in the longitudinal axial direction thereof in close proximity of a cutting tool, and a DLC film is formed over the cemented carbide alloy, cobalt being removed from the surface of the cemented carbide alloy, adjoining the DLC film. By forming the DLC film,on the surface of the cemented carbide alloy,from which cobalt has been removed, with an intermediate layer formed therebetween, adhesiveness of the DLC film against the cemented carbide alloy fixedly attached to the inner surface of the guide bush is further enhanced.

The present invention relates to a method of forming an intermediate film and a hard carbon film over the inner surface of a cylindrical member having a bore, such as a bushing or a cylinder, with the hard carbon film being formed on the intermediate film with a uniform thickness, greatly enhancing of abrasion resistance of the inner surface. The cylindrical member is placed in a vacuum vessel, an auxiliary electrode of an intermediate film forming material, such as a titanium-silicon alloy or the like, is inserted in the bore of the cylindrical member, a sputtering gas is supplied into the vacuum vessel, a voltage is applied to the auxiliary electrode to produce a plasma around the auxiliary electrode in order that the intermediate film forming material is sputtered from the auxiliary electrode and an intermediate film is formed over the inner surface of the cylindrical member. Subsequently, a gas containing carbon, such as methane gas or the like, is supplied into the vacuum vessel, and a voltage is applied to the cylindrical member to produce a plasma in the vacuum vessel in order that a hard carbon film (DLC film) is formed on the previously formed intermediate film over the inner surface of the cylindrical member.

Method of forming films over inner surface of cylindrical member

A hard carbon film is formed over an inner surface of a guide bush by fixing an auxiliary electrode support member for supporting an auxiliary electrode of a jig for forming a film in a center bore of the guide bush by an auxiliary electrode insulation member, disposing an auxiliary electrode in alignment with the axis of the center bore so as to face the inner surface, disposing legs, and a first electrode plate, a second electrode plate, and the insulation member which are fixed to the legs are placed on the bottom of a vacuum vessel placing the guide bush on the first electrode plate contacted electrically with a power source, while the projection of the auxiliary electrode support member projecting out of the auxiliary electrode insulation member is contacted electrically with the second electrode plate. The auxiliary electrode is grounded through the auxiliary electrode support member, the second electrode plate, the legs, and the vacuum vessel, a gas containing carbon is introduced into the vacuum vessel after evacuating the vacuum vessel, and a plasma is produced in the vacuum vessel by supplying electric power to the guide bush through the first electrode plate from the power source.

Jig for forming hard carbon film over inner surface of guide bush using

The present invention relates to a method of forming an intermediate film and a hard cabon film over the inner surface of a cylindrical member having a bore, such as a bushing or a cylinder, with the hard carbon film being formed on the intermediate film with a uniform thickness, greatly enhancing of abrasion resistance of the inner surface. The cylindrical member is placed in a vacuum vessel, an auxiliary electrode of an intermediate film forming material, such as a titanium-silicon alloy or the like, is inserted in the bore of the cylindrical member, a sputtering gas is supplied into the vacuum vessel, a voltage is applied to the auxiliary electrode to produce a plasma around the auxiliary electrode in order that the intermediate film forming material is sputtered from the auxiliary electrode and an intermediate film is formed over the inner surface of the cylindrical member. Subsequently, a gas containing carbon, such as methane gas or the like, is supplied into the vacuum vessel, and a voltage is applied to the cylindrical member to produce a plasma in the vacuum vessel in order that a hard carbon film (DLC film) is formed on the previously formed intermediate film over the inner surface of the cylindrical member.

A hard carbon film is formed over an inner surface of a guide bush including the steps of fixing an auxiliary electrode support member for supporting an auxiliary electrode of a jig for forming a film in a center bore of the guide bush by an auxiliary electrode insulation member, disposing an auxiliary electrode in alignment with the axis of the center bore so as to face the inner surface, disposing legs, and a first electrode plate, a second electrode plate, and the insulation member which are fixed to the legs are placed on the bottom of a vacuum vessel placing the guide bush on the first electrode plate contacted electrically with a power source, while the projection of the auxiliary electrode support member projecting out of the auxiliary electrode insulation member is contacted electrically with the second electrode plate. The auxiliary electrode is grounded through the auxiliary electrode support member, the second electrode plate, the legs, and the vacuum vessel, a gas containing carbon is introduced into the vacuum vessel after evacuating the vacuum vessel, and a plasma is produced in the vacuum vessel by supplying electric power to the guide bush through the first electrode plate from the power source.

Growing community of inventors

Kawagoe, Japan

Yukio Miya