ELECTROPLATING APPARATUS FOR COATING A DIELECTRIC RESONATOR

摘要

PCT No. PCT/JP89/01140 Sec. 371 Date Jul. 20, 1990 Sec. 102(e) Date Jul. 20, 1990 PCT Filed Nov. 7, 1989 PCT Pub. No. WO90/05389 PCT Pub. Date May 17, 1990.A resonator of dielectric ceramic includes a cylindrical body (40) having a bore (50) extending axially through the body, wherein the outside surface of the body (40) and the inside surface of the bore (50) covered with a deposited electrode (80), thereby enhancing the Q characteristics. This principal object of the invention is achieved by roughening at least a part of the outside surface of the body and then chemically etching the roughened body. The dually roughened body (40) is supported by supporting pins((110) fixed to a rotor (100) submerged in a plating bath (26), the rotor being vertical or inclined to a horizontal plane so that the body is provided with a deposited electrode (80). The surface of the rotor is provided with hills and valleys, the supporting pins being fixed on the hills. The rotor may additionally include apertures between the pins to allow the plating agent to pass through.