| 摘要 |
1,184,150. Making magnetic heads; grinding. INTERNATIONAL BUSINESS MACHINES CORP. 14 Oct., 1968 [28 Nov., 1967], No. 48539/68. Headings B3A and B3D. [Also in Division G5] In manufacturing magnetic transducers, a section is formed by covering the pole tip of a polepiece 22 extending from a support 10a defining a reference surface 36<SP>1</SP> with a coating 44 of material of greater abrasion resistance than the polepiece and grinding the coating and polepiece until a new pole tip 22 is exposed, set back by an amount d into the coating. A gap-forming shim is therefore unnecessary. A multitrack head with read-after-write gaps is formed of three brass housing sections 10 containing Fe-Ni alloy laminated cores 22 separated by copper screeens 20. Each section first has its reference surface (36-42, Fig. 2, not shown) lapped then etched to expose the polepieces 22. Chromium or a non-magnetic Ni-Sn alloy is deposited and ground as above and the mating surfaces of the sections joined. Alternatively only one side of a transducer section may be ground. The gaps may be filled with epoxy or glass by dipping the assembly into a bath. |
