Method of fabricating a light-shielding blade composed of beryllium-aluminum alloy
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United States of America Patent
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-
Jan 7, 2003
Grant Date -
May 24, 2001
app pub date -
Jan 9, 2001
filing date -
Jul 16, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A light-shielding blade material is provided that contributes to increased focal plane shutter speeds. A focal plane shutter has a front blade group and a rear blade group, each being composed of a plurality of light-shielding blades. At least one of these light-shielding blades is made of a Be--Al alloy material containing 40% by weight or more of Be, and has a thickness of 40 to 150 microns. This light-shielding blade is light in weight and high in stiffness, thereby significantly contributing the increased focal plane shutter speeds.
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