Timepiece or jewelry part and method of manufacturing timepiece or jewelry part

By uniformly dispersing gold particles in the matrix of watch or jewelry components, controlling particle size and density, and utilizing optical effects, the stability problem of dark-toned or black-toned gold alloys is solved, achieving material color consistency and simplifying manufacturing.

CN121970002APending Publication Date: 2026-05-01PATEK PHILIPPE SA
1 Cites 0 Cited by

Patent Information

Application Number
CN202480064011.8
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2024-04-26
Filing Date
2024-10-02
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing technologies struggle to reliably manufacture gold alloys ranging from 9 to 21 carats, especially for dark-toned or black watch or jewelry components, and existing methods are complex or result in unstable colors.

Method used

By uniformly dispersing gold particles in the matrix and controlling the particle size and density, the material is made to be similar to the matrix hue in the CIE L*a*b* color space. Optical effects are used to ensure color consistency, plasma effects are avoided, and simple manufacturing methods such as mixing and sintering are used.

Benefits of technology

It achieves a stable dark or black tone in gold alloys between 9 and 21 carats, with a uniform surface color that makes it difficult for observers to distinguish the gold particles from the matrix color from 30cm away, simplifying the manufacturing process.

✦ Generated by Eureka AI based on patent content.
Patent Text Reader

Abstract

The invention relates to a timepiece or jewelry part made entirely or partially of a material comprising gold between 9 and 21 carat, the material (1) comprising a matrix (2) of a predetermined color and at least gold particles (3) dispersed in the matrix, the predetermined color matrix is defined by coordinates a *, b * and L * of the predetermined color matrix in the CIE L * a * b * space, the density of the predetermined color matrix being less than or equal to 10 g / cm3, preferably less than or equal to 8 g / cm3. According to the invention, the size of the gold particles (3) is such that, in the plane of the surface of the material under study, the maximum size of the gold particles (3) is less than 60 [mu] m, preferably less than 30 [mu] m, and, in the plane of the surface of the material under study, the minimum size of the gold particles (3) is greater than 1 nm, preferably greater than 10 nm, preferably greater than 200 nm, preferably greater than 0.5 [mu] m, more preferably greater than 1 [mu] m, the gold particles (3) do not have a plasma effect and are uniformly dispersed in the matrix (2), and the amount of gold particles (3) dispersed in the matrix (2) is predetermined such that, for the same observer placed at a distance of at least 30 cm, preferably at least 10 cm, from the surface of the material (1), the gold particles (3) are irradiated by the light source under the same irradiation conditions. The material (1) appears such that the color of the material is the same as or close to the predetermined color of the substrate (2), the color of the material being such that in the CIE L * a * b * color space, the color difference [Delta] E * between the color of the material and the color of the substrate is less than 10, preferably less than or equal to 5, preferably less than or equal to 4, more preferably less than or equal to 3. The invention also relates to a method for manufacturing a timepiece or jewelry part as defined above.
Need to check novelty before this filing date? Find Prior Art