PERANGKAT PELINDUNG UNTUK SUATU TABUNG SINAR KATODA LAYAR DATAR PENAYANG WARNA DENGAN SUATU PELINDUNG BAYANGAN YANG DITEGANGKAN YANG DIBUAT DARI PADUAN Fe-Ni

摘要

Masking device for color display cathode-ray tubes, with a flat screen, comprising a support frame to a stretched shadow mask and a stretched shadow mask. The support frame is made of hardened fe - ni alloy having a coefficient of thermal expansion between 20degrec and 150degre 5 × 10 - 6 / k and a limit of elasticity rp0, 2 to 20degrec 700 mpa; the stretched shadow mask is in the alloy fe.sub.0.8 - or having a coefficient of thermal expansion between 20degrec and 150degrec 3 × 10 - 6 / k; the fe-co-cr alloys - ni are chosen such that: below a temperature t1, the coefficient of expansion means alpha20 - t, between 20degrec and t, of the alloy of the support frame is to the coefficient of expansion means alpha20 - t of the alloy of the shadow mask, at the top of t1, the coefficient alpha20 - t, of the alloy of the frame is to the coefficient alpha20 - t of the alloy of the shadow mask. With t1 350degrec, and preferably 300degrec.