公开(公告)号：US3681225A

公开(公告)日：1972-08-01

申请号：US3681225D

申请日：1970-11-23

Applicant: VICTOR COMPANY OF JAPAN

Inventor： GENMA SUSUMU ,  KURODA AKIO ,  KATO TOSHIO ,  KISHI FUSAO

IPC: G11B5/82 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  H01F10/06

CPC classification number: H01F10/06 ,  G11B5/8404 ,  Y10S205/917 ,  Y10S205/922 ,  Y10S428/928 ,  Y10S428/935 ,  Y10T428/12944 ,  Y10T428/12993

Abstract: A METHOD OF MAKING MAGNETIC DISC WHEREIN AN ELECTRICALLY CONDUCTING MATERIAL LAYER IS FORMED ON THE SUFACES OF A BASE PLATE MADE BY SHAPING A SYNTHETIC RESINOUS MATERIAL, THEN A MAGNETIC MATERIAL IS APPLIED TO THE COAT BY ELECTRODEPOSITION AND FINALLY THE SURFACES ARE POLISHED BY A POLISHING MATERIAL OF VERY SMALL GRAIN SIZE. THE LAYER OF MAGNETIC MATERIAL FORMED BY ELECTRODEPOSITION HAS ITS SURFACES RENDERED SMOOTH BY THE POLISHING OPERATION BECAUSE MINUTE FISSURES IN THE SURFACES ARE REMOVED AND AT THE SAME TIME THE MAGNETIC MATERIAL LAYER ITSELF IS ANNEALED BY THE HEAT OF FRICTION.