The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 1984
Filed:
Oct. 01, 1980
Fujitsu Limited, Kawasaki, JP;
Abstract
A cassette type magnetic bubble memory device is dismountably attached to a main apparatus, having a bubble driving circuit, a bubble writing circuit and a bubble reading circuit, and which comprises a case and, contained therein, a magnetic bubble memory element including at least a bubble chip, a coil for producing a revolving magnetic field and a magnet for producing a bias magnetic field. A writing-inhibiting member is mounted on the surface of the case to hold the state of inhibition of the writing operation in the magnetic bubble memory element. This writing-inhibiting member is arranged so that the state of inhibition of the writing operation and the state of allowance of the writing operation can be switched by a manual operation. A lock mechanism for preventing separation of the cassette while a revolving magnetic field is produced and a converse insertion-inhibiting mechanism for inhibiting converse insertion of the cassette when the cassette is being attached to the main apparatus are also provided.