METAL FOIL FOR SPRING MEMBER, SPRING MEMBER FOR ELECTRONIC DEVICE, PRODUCTION METHOD FOR METAL FOIL FOR SPRING MEMBER, AND PRODUCTION METHOD FOR SPRING MEMBER FOR ELECTRONIC DEVICE
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United States of America
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Issued Date -
Nov 28, 2024
app pub date -
Aug 6, 2024
filing date -
Aug 6, 2024
priority date (Note) -
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status (Latency Note)
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Abstract
A metal foil includes a first region on which the spring member is formed. The first region has a square shape with one side being 300 mm. A difference value between a maximum value and a minimum value of a first thickness at each of points on a straight line in a rolling direction in the first region is a first difference value. A difference value between a maximum value and a minimum value of a second thickness at each of points on a straight line in a width direction orthogonal to the rolling direction is a second difference value. An absolute value of the difference value obtained by subtracting the second difference value from the first difference value is less than or equal to 0.8 μm.
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