Abstract In a method of forming a fluorescent screen of a color picture tube by a dry process, the method comprises a first step of precoating an emulsion containing a powder of acryl resin on an inner surface of a face plate of the color picture tube to form a primary coating, a second step of coating on the primary coating a photosensitive composition consisting essentially of a diazonium salt to form a thin film, a third step of exposing to light a selected portion of the thin film to render the same to become adhesive, a fourth step of depositing a powder of a phosphor on the selected portion to form a phosphor layer of a first color and a fifth step of repeating the third and fourth steps to form phosphor layers of second and third colors.
A method of forming a fluorescent screen of a color picture tube comprising: a first step of precoating an emulsion containing a powder of acryl resin on an inner surface of a face plate of the color picture tube to form a primary coating; a second step of coating on said primary coating a photosensitive composition consisting essentially of a diazonium salt to form a thin film; a third step of exposing to light a selected portion of said thin film to render the same to become adhesive; a fourth step of depositing a powder of a phosphor on said selected portion to form a phosphor layer of a first color; and a fifth step of repeating the third and fourth steps to form phosphor layers of second and third colors.
Claim 2
Independent Claim
131 words
A method of forming a fluorescent screen of a color picture tube comprising: a first step of precoating an emulsion containing a powder of acryl resin on an inner surface of a face plate of the color picture tube to form a primary coating; a second step of coating on said primary coating a photosensitive composition consisting essentially of a diazonium salt to form a thin film; a third step of exposing to light a selected portion of said thin film to render the same to become adhesive; a fourth step of depositing a powder of a phosphor on said selected portion to form a phosphor layer of a first color; and a fifth step of repeating the third and fourth steps to form phosphor layers of second and third colors.
Claim 3
Dependent Claim
22 words
The method according to claim 1 wherein said powder of acryl resin had a particle size of from 0.5 to 0.01 microns.