公开(公告)号：EP0077881A3

公开(公告)日：1985-05-22

申请号：EP82106647

申请日：1982-07-23

Applicant: International Business Machines Corporation

Inventor： Rigby, Eugene Bertrand ,  Robinson, Neil Lloyd

IPC: C04B37/00 ,  H01F01/34 ,  H01F10/20 ,  G11B05/251

CPC classification number: G11B5/232 ,  C04B37/005 ,  C04B2235/6567 ,  C04B2237/10 ,  C04B2237/34 ,  C04B2237/62 ,  C04B2237/76

Abstract: In a method of removing bubbles from glass in glass bonded ceramic pieces (44), the bonded pieces are inserted into a furnace (32). The furnace is evacuated by a pump (56) and argon under pressure is introduced into the furnace which is heated to above the working point of the glass. This temperature and pressure are held for a time to reduce the quantity and size of bubbles in the glass. The furnace is then cooled to the anneal temperature of the glass and the temperature and pressure are held for a time to anneal the glass. Thereafter, the chamber is rapidly cooled and the pressure released.

公开(公告)号：EP0105460A3

公开(公告)日：1985-05-15

申请号：EP83109670

申请日：1983-09-28

Applicant: International Business Machines Corporation

Inventor： Argumedo, Armando Jesus ,  Gniewek, John James ,  Powell, Jimmie Lee ,  Rigby, Eugene Bertrand

IPC: C04B37/00 ,  G11B05/251

CPC classification number: G11B5/105 ,  C04B37/005 ,  C04B2235/6565 ,  C04B2237/10 ,  C04B2237/34 ,  C04B2237/64 ,  C04B2237/84 ,  G11B5/1335 ,  G11B5/232

Abstract: In a method of bonding ceramic bodies together by causing molten glass to flow between the surfaces to be bonded and cooling the glass to ambient temperature, the glass is heated to a temperature in excess of a low stress anneal temperature of the glass, and the glass is quickly cooled from the low stress anneal temperature to ambient temperature at a rate greater than about 5°C/minute.

公开(公告)号：WO1981002803A1

公开(公告)日：1981-10-01

申请号：PCT/US1981000292

申请日：1981-03-09

Applicant: SPIN PHYSICS INC

Inventor： SPIN PHYSICS INC ,  GRIFFITH N

IPC: G11B05/251

CPC classification number: G11B15/12 ,  G11B5/235 ,  G11B5/245 ,  G11B5/29 ,  G11B5/4907

Abstract: A gapped magnetic core (10) is comprised of core material (12) of one type. Magnetic gapping material (16) having a magnetic saturation level that is lower than that of the core material, "completely" bridges the core gap. The gapping material prevents the gap from acting as a transducer gap until the gapping material becomes magnetically saturated. When gapped cores as described above are stacked to form a multitrack head (100), the effects of inductive coupling between the cores is prevented; i.e., when, for example, one core of the stack of cores is actuated by magnetically saturating its gap, all other cores of the stack are inherently immune to inductive coupling to the actuated core. This is because induced flux in all non-actuated cores is magnetically short-circuited through their respective magnetic gaps.