Magnetic field confirming case with inclined portions for magnetic bubble memory module

A magnetic bubble memory module comprising:

• (a) a rectangular annular core having two pairs of opposite sides wound by a pair of wires, respectively;
• (b) a magnetic bubble memory chip disposed at a position surrounded by said core;
• (c) a flexible substrate loading said magnetic bubble memory chip and electrically connecting the same for leading input and output signals to said chip out of a case for confining a revolving magnetic field, said revolving-magnetic-field confining case accommodating said core, said chip and said flexible substrate;
• (d) a pair of magnetic bodies mounted on upper and lower surfaces of said revolving-magnetic-field confining case;
• and
• (e) inclined portions formed on said revolving-magnetic-field confining case at positions at which said pair of magnetic bodies are mounted, said inclined portions causing said pair of magnetic bodies to be inclined at a predetermined angle to said chip in said case, said inclined portions of said case being provided by a varying plate thickness of said case.