Patent ID: 6117774
Filing Date: 2000-09-12
Classification: B05C,C23F,H01J,Y10S

Abstract:
A method of manufacturing a shadow mask, said method comprising:feeding in a substantially horizontal direction a strip-like metallic thin plate having a first main surface and a second main surface in such a manner that said first main surface faces downward, said first main surface being previously etched and having a plurality of concave sections formed thereon, and said second main surface being previously formed with a resist layer, the resist layer having a plurality of openings;(i) coating an etching resistant liquid on said first main surface, and (ii) filling said concave sections with said etching resistant liquid while coating said etching resistant liquid, coating said etching resistant liquid by making use of an etching resistant layer-coating apparatus which is disposed beneath said first main surface of the metallic thin plate, thereby forming an etching resistant layer on said first main surface, said etching resistant layer-coating apparatus being provided with a gravure roll 20 mm to 60 mm in diameter, a member for feeding said etching resistant liquid onto said gravure roll, and a doctor blade disposed over said gravure roll;wherein said coating of said etching resistant liquid on said first main surface is performed by (i) contacting a portion of said first main surface with a surface of said gravure roll carrying said etching resistant liquid, an excessive amount of said etching resistant liquid being wiped away in advance of said coating by means of said doctor blade, while a portion of said second main surface which is located opposite to said portion of said first main surface remains free of contact by said gravure roll, an auxiliary roll being adapted for contact with the second main surface downstream of said portion of said second main surface, and (ii) under conditions that said gravure roll is rotated in a direction opposite to that of said metallic thin plate and at a peripheral speed of 4 to 25 times as high as that of a feeding speed of said metallic thin plate; andetching said second main surface to form a plurality of through holes from said plurality of openings, each through hole (i) corresponding to one of the plurality of openings and (ii) passing from said second main surface to one concave section of said plurality of concave sections formed on said first main surface.