Patent ID: 7387741

Claim:
A wet treatment method of a metal-ceramic bonded member for wet-treating the metal-ceramic bonded member having a metal circuit plate bonded on one surface of a ceramic substrate by using a wet treatment equipment, the method comprising: bonding a metal plate for the metal circuit plate to one surface of said ceramic substrate, so that an outer peripheral edge portion of the surface of said ceramic substrate is exposed having a width; providing a protective pattern having a resistance against etching solution on said metal plate, according to a desired metal circuit pattern; making a metal-ceramic bonded member covered with a masking member having a square shape with a recessed portion in a center thereof or a plate shape, and having a window portion from which said metal plate is exposed, making the metal-ceramic bonded member covered with said masking member so that said metal plate is exposed and the surface of the outer peripheral edge portion of the ceramic substrate of said metal-ceramic bonded member is brought into contact with a surrounding part of the window portion of said masking member; and installing this metal-ceramic bonded member on an opening part provided in an upper part of said wet-treatment equipment, in a state that a surface exposed from the window portion of said masking member and bonded with said metal plate is directed downward; pressing a part of the masking member, where the masking member and the outer peripheral edge portion of one surface of the ceramic substrate are in contact with each other, against the outer peripheral edge portion of one surface of the ceramic substrate, by pressing the metal-ceramic bonded member from an opposite side of the surface bonded with the metal plate, wherein a pressing portion forms the window portion; and making a treatment solution for wet-treating the metal circuit plate come in contact with the metal plate to form the desired metal circuit pattern.