公开(公告)号：JPH10334795A

公开(公告)日：1998-12-18

申请号：JP14025897

申请日：1997-05-29

Applicant: MATSUSHITA ELECTRONICS CORP

Inventor： HASHIMOTO TAKESHI ,  HIROTA MASAAKI

IPC: B01D35/02 ,  H01J1/14 ,  H01J1/20 ,  H01J9/04 ,  H01J29/04

Abstract: PROBLEM TO BE SOLVED: To reduce the impurities left in trace in a carbonate powder and the impurities included in the preparing process of a suspension by executing a solid-liquid separating process for reducing particles insoluble to an organic solvent to a cathode raw material suspension to be applied to a cathode gas metal, which contains a carbonate, a binder and the organic solvent, and includes particles insoluble to the organic solvent. SOLUTION: A binder is dissolved in an organic solvent, and impurities in the binder is separated and reduced by filtering at a reduced pressure of 500-600 mmHg. An alkali earth metal carbonate powder is mixed to the organic solvent containing the resulting binder to manufacture a suspension. The suspension is further filtered to filter the impurities contained in the carbonate powder and the impurities included in the preparing process of the suspension. The suspension from which the impurities are reduced is applied onto a cathode base metal by means of spray or electrodeposition. Thus, the solid foreign matter in a cathode forming the electron radiation source of electron beam of a cathode-ray tube can be reduced.

公开(公告)号：JPH11185606A

公开(公告)日：1999-07-09

申请号：JP35048097

申请日：1997-12-19

Applicant: MATSUSHITA ELECTRONICS CORP

Inventor： KAWASAKI MASAKI ,  HIROTA MASAAKI ,  HAMAGUCHI YOSHIO ,  HASHIMOTO TAKESHI ,  YAMAMOTO YOJI

IPC: C25D13/02 ,  H01J9/08

Abstract: PROBLEM TO BE SOLVED: To provide a manufacturing method for a cathode-ray tube to realize a long lifetime of a heater and stable production by ensuring uniformity of an alumina insulating layer and stability of a suspension for electrodeposition. SOLUTION: This is a manufacturing method of a cathode-ray tube that a heater 2, which is made by forming an alumina insulating layer 4 made of alumina powders on a metallic wire 3 as a heater main metal by means of an electrophoresis, is provided inside a cathode part of an electron gun. Alumina powders are suspended in a fixed liquid to form a suspension for electrodeposition after cleaning the alumina powders with warm running water, and the alumina insulating layer 4 made of alumina powders is formed on the metallic wire 3 by means of an electrophoresis.