Sound reproduction apparatus

Abstract

R); f•ded in Britain 25 March 1977 Printed circuit conductors are interleaved with or surround this tone arm made entirely of electrical insulation material such as a resin or wood, and which is solid rather than tubular. The conductors are formed by evaporation or electro-deposition prior to etching. The four signal conductors 4 which are in a stereophonic embodiment as shown here in cross section, alternate in position with the conductors connected to ground 5. This arrangement minimizes mutual interference while rigidly positioning the conductors. The nonmetallic and nontubular tone arm is claimed to be less prone to resonate, more readily formable in manufacture, light in weight, and rigid.-DSG 4,246,444 43.88.Si TELEPHONE HANDSET ACOUSTIC COUPLING This patent describes the mechanical construction of a magnetic telephone receiver.-RWC 246