Masking device for a color cathode-ray display tube with a flat screen, of the type comprising a support frame for a tensioned shadowmask, and tensioned shadowmask
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United States of America Patent
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Jul 16, 2002
Grant Date -
N/A
app pub date -
Jun 22, 2000
filing date -
Jun 22, 1999
priority date (Note) -
Expired
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Abstract
Masking device for a color cathode-ray display tube with a flat scree, of the type comprising a support frame for a tensioned shadowmask and a tensioned shadowmask mounted on the support frame so as to undergo tensioning at room temperature, in which device the support frame is made of a hardened Fe--Ni alloy having a thermal expansion coefficient between 20.degree. and 150.degree. C. of less than 5.times.10.sup.31 6 K.sup.-1 and a yield stress R.sub.p0.2 at 20.degree. C. of greater than 700 MPa, and the tensioned shadowmask is made of a hardened FeNi or Fe--Ni alloy having a thermal expansion coefficient between 20.degree. C. and 150.degree. C. of less than 5.times.10.sup.-6 K.sup.-1.
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