Record matrix preparation
AssigneeEMI Limited
InventorDavid E. Birt
Life of this patent
Estimating the term…
Abstract
An apparatus, for use in an electroplating arrangement, for establishing electrical contact with a metal or metalized cathode plate used in production of a disc record matrix. The apparatus includes an electrically conductive contact member and a clamping means for holding the contact member against a cathode plate supported by the apparatus. The contact member and clamping means are shaped so that electrical contact is established at the periphery only of the cathode plate.
Claims4
An electroplating arrangement comprising a metal or metalised cathode plate suitable for use in production of a disc record matrix, a current terminal located on an axis intersecting substantially the centre of said cathode plate and an electrically conducting annular contact member, a clamping means including a current distribution member, said clamping means being adapted to hold said contact member against said cathode plate, said current distribution member establishing a substantially uniform distribution of current from said terminal to the contact member, wherein the distribution member comprises a plurality of spaced electrical conductors, said conductors comprising an electrically conductive strip extending substantially radially from a common location on said axis and including an electrically conductive linkage member connecting each said strip to the contact member.
Dependencies are inferred from the claim text.