公开(公告)号：JPH06139930A

公开(公告)日：1994-05-20

申请号：JP29060392

申请日：1992-10-29

Applicant: TOSHIBA CORP

Inventor： NAKAMURA MICHIO ,  SONE TOSHIHISA ,  KADOKAWA SATOSHI ,  JO KATSUYOSHI

IPC: H01J9/227

Abstract: PURPOSE:To restrain the occurrence of rust for reducing a phosphor screen defect, and improve breakdown voltage characteristics of a color cathode-ray tube by electrically connecting a metal member having higher ionization tendency than iron to a support seat made of soft steel material. CONSTITUTION:A support seat 30 for positioning and supporting a panel 1 mainly comprises a soft steel material (iron material) as a base material, and the required section thereof is applied with paint. A part of the seat 30 is not applied with the paint, and the base material is exposed. Also, the lower side of the seat 30 is fitted with a metal block 36 (zinc block) mainly comprising zinc having higher ionization tendency than iron constituting the base material. In this case, when the block 36 having higher ionization tendency than iron as the constituent element of the seat 30 is electrically connected to the seat 30, the block 36 corrodes faster than the seat 30. Also, electrons generated at the time of the appearance of cation are supplied to the iron constituting the seat 30. As a result, the occurrence of rust on the seat 30 is restrained, thereby reducing a phosphor screen defect. At the same time, the breakdown voltage characteristics of a cathode-ray tube can be improved.