| 摘要 |
PURPOSE:To enable uniform control of current density in the stage of plating in a disc type rotary plating device for producing a matrix for a disc record by forming an anode which is a plating metal with respect to a cathode which is the matrix into plural ring shapes and using respectively independent power sources for the same. CONSTITUTION:A matrix 13 is attached freely rotatably in a cathode chamber 23 and is connected via a fabric diaphragm 22 to an anode chamber 24 in the stage of plating Ni at a uniform thickness on the surface of a cathode disc 13 as a matrix for a disc record. Three pieces of annular anodes 41, 42, 43 contg. pellet-shaped Ni 50 in a Ti vessel are provided concentrically in an anode chamber 24 and the parts between the same are electrically insulated by means of partition plates 44, 45. The respective anodes are connected to the positive poles of respectively independent power sources 38, 39, 40, and the negative electrodes of the power sources are connected to the matrix 13 by means of a power feed brush 18. An Ni plating soln. is put in the device and while the matrix 13 is rotated with a motor 19, the voltages of the respective anodes are controlled, whereby the current for plating is conducted at uniform current density over the entire surface of the matrix 13 and the uniform Ni plating film is formed.
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