EP0027337A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Magnetic bubble memory device
Assignee: Fujitsu Ltd
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Filing: 1980-10-01
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Granted: —
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Expires: 2000-10-01
Abstract
Abstract Disclosed is a cassette type magnetic bubble memory device which is dismountably attached to a main apparatus (28) comprising 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 magneticfield. A writing-inhibiting member (4) 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 (4) 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.
Inventors
- 👤 Toshiaki Sukeda
- 👤 Shiro Naoi
- 👤 Harumi Maegawa
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 14:40
CPC Classifications
H; H05; H05K; H05K5/00; H05K5/02; H05K5/0256; H05K5/026; G; G11; G11C; G11C19/00; G11C19/02; G11C19/08; G11C19/085
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
131 words
A cassette type magnetic bubble memory device which is dismountably attached to a main apparatus comprising 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, said cassette type magnetic bubble memory device further comprising a writing-inhibiting member mounted on the surface of said case to hold the state of inhibition of the writing operation to said magnetic bubble memory element, said writing-inhibiting member being 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.
Claim 2
Dependent Claim
131 words
A cassette type magnetic bubble memory device which is dismountably attached to a main apparatus comprising 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, said cassette type magnetic bubble memory device further comprising a writing-inhibiting member mounted on the surface of said case to hold the state of inhibition of the writing operation to said magnetic bubble memory element, said writing-inhibiting member being 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.
Claim 3
Dependent Claim
67 words
A cassette type magnetic bubble memory device as set forth in claim 1, wherein the writing-inhibiting member consists of a slide plate and the state of inhibition of the writing operation and the state of allowance of the writing operation are set by closing of a concave portion formed on said case by said slide plate and opening of said concave portion by said slide plate, respectively.
Claim 4
Dependent Claim
68 words
A cassette type magnetic bubble memory device as set forth in claim 2, wherein the sliding direction of the slide plate is the same as the insertion direction of the cassette type magnetic bubble memory device and when the slide plate is non-intentionally slid connectively with the operation of insertion of the cassette type magnetic bubble memory device, the state of inhibition of the writing operation is set.
Claim 5
Dependent Claim
67 words
A cassette magnetic bubble memory device as set forth in claim 2, wherein the slide plate includes at least one elastic arm, a projection is formed on the top end of the arm, and the projection is engaged with one of concave portions formed on both the end portions of an arm-guiding groove of said case to hold the slide plate at the open or closed position.
Claim 6
Dependent Claim
58 words
A cassette type magnetic bubble memory device as set forth in claim 1, wherein a switch element for discriminating the state of inhibition of the writing operation and the state of allowance of the writing operation in the writing-inhibiting member is disposed and the writing operation to the magnetic bubble memory element is controlled by said switch element.
Claim 7
Dependent Claim
76 words
A cassette type magnetic bubble memory device as set forth in claim 1, wherein a concave portion is formed on the surface of the case so that an anchoring claw of the main apparatus can be fitted into and engaged with said concave portion, and while said magnetic bubble memory device is attached to the main apparatus and is driven by the main apparatus, the magnetic bubble memory device cannot be separated from the main apparatus.
Claim 8
Dependent Claim
75 words
A cassette type magnetic bubble memory device as set forth in claim 1, wherein a guide groove is formed on each of both side surfaces of said case; and guide members which fit into said guide grooves, respectively, are formed on said main apparatus so as to support said case, in which widths of said both guide grooves are different from each other so that insertion of the cassette in an inversed state is prevented.
Claim 9
Dependent Claim
46 words
A cassette type magnetic bubble memory device as set forth in claim 1, wherein the distance between the surface of the case and the magnetic bubble memory element is adjusted so that the magnetic bubble memory element is not substantially influenced by a disturbance magnetic field.
Claim 10
Dependent Claim
28 words
A cassette type magnetic bubble memory device as set forth in claim 1, wherein detection of the slide position of said slide plate is accomplished by magnetic means.
Claim 11
Dependent Claim
70 words
A cassette type magnetic bubble memory device as set forth in claim 8, wherein said magnetic means is a permanent magnetic disposed below the slide plate of the case, the slide plate is formed of a magnetic material and a magnet-responding switch is disposed so that the switch controls the writing operation in the magnetic bubble memory element according to the quantity of magnetic fluxes leaking through said slide plate.
Claim 12
Dependent Claim
28 words
A cassette type magnetic bubble memory device as set forth in claim 2, wherein detection of the slide position of said slide plate is accomplished by optical means.
Claim 13
Dependent Claim
38 words
A cassette type magnetic bubble memory device as set forth in claim 1, wherein among a plurality of terminals of a connector of the cassette magnetic bubble memory device, two terminals are connected to a cassette attachment-detecting circuit.
Claim 14
Dependent Claim
41 words
A cassette type magnetic bubble memory device as set forth in claim 12, wherein said two terminals among a plurality of terminals of said connector are terminals most distant from each other in either the horizontal direction or the vertical direction.
References Cited (Backward Citations)
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