Abstract: An envelope of an image display device has a front substrate and a rear substrate opposed to the front substrate, and respective peripheral edge portions of the front substrate and the rear substrate are sealed together with a sealing layer which contains an electrically conductive sealing material. An electrode for energizing the sealing layer is attached to the envelope. The electrode is formed of an electrically conductive member, is in electrical contact with the sealing layer, and has a conduction portion exposed to the outside.

Abstract: A shadow mask manufacturing method comprising the cleaning step performs rapid cleaning by spraying a cleaning solution, which is inert with respect to the band-like thin metal plate, upon upper and lower surfaces of the band-like thin metal plate and thereby generating cavitation near the surfaces of the band-like thin metal plate by using cavitation jet means, while regulating a position of the band-like thin metal plate and preventing the cleaning solution from leaking in a direction opposite to the conveyance direction of the band-like thin metal plate by using a first leakage-preventing seal unit provided upstream the cavitation jet means.