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US 4,455,199 AGranted
Method of manufacturing a timepiece component
AssigneeCitizen Watch Co., Ltd.
InventorTadao Enomoto
Life of this patent
Estimating the term…
Abstract
A timepiece display component such as hands and dial plates, which component comprises a first electroformed metal layer having an internal compressive stress, and a second electroformed metal layer formed over said first electroformed metal layer and including an internal tensile stress, such that the internal stresses of the first and second metal layers cancel each other out to reduce the amount of warping distortion in the display component.
Claims6
A timepiece display component comprising:
- a first metal layer formed by electroforming processing step;
- and
- a second metal layer formed upon said first metal layer by electroforming processing step;
- said first metal layer having an internal compressive stress while said second metal layer has an internal tensile stress such that said internal stresses are arranged to cancel each other out to reduce the amount of warping of said timepiece display component;
- and
- said first metal layer including a flat portion, a boss portion extending from said flat portion through said second metal layer, and a bore formed through said boss portion, said second metal layer including a flat portion formed on the flat portion of said first metal layer, and a boss portion formed around an outer wall of the boss portion of said first metal layer.
3 more elements
A timepiece display component comprising:
- a first metal layer formed by electroforming processing step;
- and
- a second metal layer formed upon said first metal layer by electroforming processing step;
- said first metal layer having an internal compressive stress while said second metal layer has an internal tensile stress such that said internal stresses are arranged to cancel each other out to reduce the amount of warping of said timepiece display component.
1 more element
Dependencies are inferred from the claim text.