Metal foil for spring member, production method for metal foil for spring member, and spring member for electronic device
AssigneeToppan Holdings Inc.
InventorsShinichi SHIMAMURA, Akihiko KOBAYASHI, Hiroyasu AIZAWA
Life of this patent
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Abstract
A metal foil for a spring member includes a first region on which the spring member is formed. The first region has a square shape with one side being 300 mm. In the first region, an absolute value of a difference value obtained by subtracting a standard deviation of a thickness in a width direction orthogonal to a rolling direction from a standard deviation of a thickness in the rolling direction is less than or equal to 0.15 μm. In the first region, an absolute value of a difference value obtained by subtracting a second maximum value from a first maximum value is less than or equal to 0.8 μm.
Claims48
A metal foil for a spring member used to manufacture a spring member, the metal foil comprising:
- a first region on which the spring member is formed, the first region having a square shape with one side being 300 mm, wherein, in the first region,
- an absolute value of a difference value obtained by subtracting a standard deviation of a thickness in a width direction orthogonal to a rolling direction from a standard deviation of a thickness in the rolling direction is less than or equal to 0.15 μm, and
- a maximum value of the thickness in the rolling direction is a first maximum value, a maximum value of the thickness in the width direction is a second maximum value, and an absolute value of a difference value obtained by subtracting the second maximum value from the first maximum value is less than or equal to 0.8 μm.
A method for manufacturing a metal foil for a spring member used to manufacture the spring member, the method comprising:
- rolling a base material;
- and
- preparing rolled materials obtained by rolling the base material and then selecting the metal foil for the spring member from the rolled materials, wherein
- each of the rolled materials includes a first region on which the spring member is formed, the first region having a square shape with one side being 300 mm,
- in the first region, a maximum value of the thickness in a rolling direction is a first maximum value, and a maximum value of the thickness in a width direction orthogonal to the rolling direction is a second maximum value, and
- the selecting the metal foil for the spring member selects, from the rolled materials, as the metal foil for the spring member, the rolled material in which an absolute value of a difference value obtained by subtracting a standard deviation of the thickness in the width direction from a standard deviation of the thickness in the rolling direction is less than or equal to 0.15 μm in the first region and an absolute value of a difference value obtained by subtracting the second maximum value from the first maximum value is less than or equal to 0.8 μm.
A spring member for an electronic device formed from a metal foil for a spring member, wherein
- an absolute value of a difference value obtained by subtracting a standard deviation of a thickness of the metal foil for the spring member in a width direction orthogonal to a rolling direction from a standard deviation of a thickness of the metal foil for the spring member in the rolling direction is less than or equal to 0.15 μm, and
- in the metal foil for the spring member, a maximum value of the thickness in the rolling direction is a first maximum value, a maximum value of the thickness in the width direction is a second maximum value, and an absolute value of a difference value obtained by subtracting the second maximum value from the first maximum value is less than or equal to 0.8 μm.
Dependencies are inferred from the claim text.