EP 0224296 B1 19900221 - METHOD OF DRAPE DRAWING A SHADOW MASK FOR A COLOUR DISPLAY TUBE, SHADOW MASK MANUFACTURED BY SAID METHOD, AND COLOUR DISPLAY TUBE COMPRISING SUCH A SHADOW MASK
Title (en)
METHOD OF DRAPE DRAWING A SHADOW MASK FOR A COLOUR DISPLAY TUBE, SHADOW MASK MANUFACTURED BY SAID METHOD, AND COLOUR DISPLAY TUBE COMPRISING SUCH A SHADOW MASK
Publication
Application
Priority
NL 8503087 A 19851111
Abstract (en)
[origin: EP0224296A1] A shadow mask sheet 1 for a colour display tube consisting of an iron-nickel alloy of the invar type is drape drawn by means of a drawing process. During said drawing process the shadow mask sheet 1 is provided with a skirt 2. By keeping the rim 16 of the skirt 22 clamped in a slip-free manner during the drawing process, the skirt 22 can be plastically deformed simultaneously with the formation of the skirt 22, as a result of which the reproducibility of the shape of the shadow mask sheet 1 is increased.
IPC 1-7
IPC 8 full level
B21D 22/26 (2006.01); H01J 9/14 (2006.01); H01J 29/07 (2006.01)
CPC (source: EP KR)
H01J 9/14 (2013.01 - KR); H01J 9/142 (2013.01 - EP); H01J 29/07 (2013.01 - KR)
Designated contracting state (EPC)
AT DE ES FR GB IT
DOCDB simple family (publication)
EP 0224296 A1 19870603; EP 0224296 B1 19900221; AT E50470 T1 19900315; CN 1007849 B 19900502; CN 86107752 A 19880518; DD 250398 A5 19871008; DE 3669089 D1 19900329; ES 2013993 B3 19900616; JP H0754662 B2 19950607; JP S62113333 A 19870525; KR 870005431 A 19870608; KR 950002261 B1 19950315; NL 8503087 A 19870601
DOCDB simple family (application)
EP 86201961 A 19861110; AT 86201961 T 19861110; CN 86107752 A 19861108; DD 29601186 A 19861106; DE 3669089 T 19861110; ES 86201961 T 19861110; JP 26491286 A 19861108; KR 860009419 A 19861108; NL 8503087 A 19851111