公开(公告)号：CA954364A

公开(公告)日：1974-09-10

申请号：CA130416

申请日：1971-12-17

Applicant: MATSUSHITA ELECTRONICS CORP

Inventor： KOBAYASHI YOSHICHIKA ,  YAKENO KOUZI

IPC: H01J9/227

Abstract: A phosphor screen for color picture tube is usually produced by the first step which comprises suspending a blue emission phosphor in an aqueous solution of photo-setting photosensitive material comprising polyvinyl alcohol and ammonium dichromate, applying thus obtained suspension to inner surface of face panel to form a photosensitive film, exposing said film through apertures of shadow mask and developing the exposed film to form dotty phosphor film and the second and the third steps of forming the dotty phosphor films of green and red emissions in this order by substantially the same procedure as that of the first step. According to the present invention, the dotty phosphor films formed at said first and second steps are treated with chromic acid solution to harden said films, whereby color mixing, namely, so-called color fogging caused by a phosphor of other color emission used at the subsequent step is reduced and color purity of emission from phosphor screen face is improved.

公开(公告)号：AU3698271A

公开(公告)日：1973-06-21

申请号：AU3698271

申请日：1971-12-16

Applicant: MATSUSHITA ELECTRONICS CORP

Inventor： KOBAYASHI YOSHICHIKA ,  YAKENO KOUZI

IPC: H01J9/227 ,  H01J29/22 ,  H01J29/30 ,  C09K1/00

Abstract: A phosphor screen for color picture tube is usually produced by the first step which comprises suspending a blue emission phosphor in an aqueous solution of photo-setting photosensitive material comprising polyvinyl alcohol and ammonium dichromate, applying thus obtained suspension to inner surface of face panel to form a photosensitive film, exposing said film through apertures of shadow mask and developing the exposed film to form dotty phosphor film and the second and the third steps of forming the dotty phosphor films of green and red emissions in this order by substantially the same procedure as that of the first step. According to the present invention, the dotty phosphor films formed at said first and second steps are treated with chromic acid solution to harden said films, whereby color mixing, namely, so-called color fogging caused by a phosphor of other color emission used at the subsequent step is reduced and color purity of emission from phosphor screen face is improved.