GB1395592A

GB1395592A – Magnetic domain store
– Google Patents

GB1395592A – Magnetic domain store
– Google Patents
Magnetic domain store

Info

Publication number
GB1395592A

GB1395592A
GB5175772A
GB5175772A
GB1395592A
GB 1395592 A
GB1395592 A
GB 1395592A
GB 5175772 A
GB5175772 A
GB 5175772A
GB 5175772 A
GB5175772 A
GB 5175772A
GB 1395592 A
GB1395592 A
GB 1395592A
Authority
GB
United Kingdom
Prior art keywords
domain
sheet
light
magnetic
field
Prior art date
1971-11-12
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)

Expired

Application number
GB5175772A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)

Philips Electronics UK Ltd

Original Assignee
Philips Electronic and Associated Industries Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
1971-11-12
Filing date
1972-11-09
Publication date
1975-05-29

1972-11-09
Application filed by Philips Electronic and Associated Industries Ltd
filed
Critical
Philips Electronic and Associated Industries Ltd

1975-05-29
Publication of GB1395592A
publication
Critical
patent/GB1395592A/en

Status
Expired
legal-status
Critical
Current

Links

Espacenet

Global Dossier

Discuss

Classifications

G—PHYSICS

G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS

G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION

G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes

G09G3/02—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes by tracing or scanning a light beam on a screen

G—PHYSICS

G11—INFORMATION STORAGE

G11C—STATIC STORES

G11C13/00—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00

G11C13/04—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam

G11C13/06—Digital stores characterised by the use of storage elements not covered by groups G11C11/00, G11C23/00, or G11C25/00 using optical elements ; using other beam accessed elements, e.g. electron or ion beam using magneto-optical elements

Abstract

1395592 Magnetic storage arrangements PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 9 Nov 1972 [12 Nov 1971] 51757/72 Heading H3B Binary information is represented by the position of a cylindrical domain 4, Fig. 1, in a two-position bit location 5 in a sheet of magnetic material 1, the stored information being changed by first applying a light beam to locally heat the sheet above its compensation temperature, and then during the cooling phase applying an in-phase magnetic field h or h1 in the direction in which domain movement is required. As shown a matrix of bit locations are provided in the sheet which has a normal bias field H stabilizing the domains. A domain is located in a selected position by a permalloy dot 2, 3, a permalloy strip 7, Fig. 2, or a pattern of permanent cylindrical domains 35 in an adjacent magnetic plate 34, Fig. 6. An in-plane field particular to each row of a matrix of bit locations may be produced by appropriately energizing the conductors 12, Fig. 3, of a set of parallel conductors, simultaneous domain movement in a selected column of bit locations being obtained in the cooling phase which follows optical heating of the selected column area 11. Generally the effect of heat is to alter a domain shape to that of a strip 41, Figs. 1 and 2, which contracts to a cylindrical domain during the cooling phase in a direction determined by the direction of the in-phase field h, h1. An information storage system is shown in Fig. 4, in which a light beam 16 from a source 15 is directed on to a selected bit location 5 by a light deflection unit 19, the light source being controlled by a signal 18 so that high and low intensity beams, respectively, are provided for the thermal writing operation and for non- destructive optical read-out. An apertured plate 26 is located at the rear of sheet 1, with the apertures so positioned that light can pass through one position only of each of the twoposition bit locations 5 to a light guide 27 and a detector 28. An output 29 is produced by the detector when the plane of polarization of light transmitted through an interrogated location is rotated by the Faraday magnetooptic effect due to the presence of a domain in the apertured position. In a modification providing a word organized store, Fig. 8, the beam from the deflection unit passes through a beam splitter 41, the plurality of beams so produced being directed respectively to a corresponding location on each of a plurality of magnetic sheets 33 in structures 42. Each structure comprises a permanent cylindrical domain storage plate 34, an apertured plate 26 and a light guide 27 is addition to the magnetic sheet 33, the bit written into each sheet being determined by an associated field source 43 providing in-plane field h, h1. An arrangement is provided for maintaining the store at a constant temperature.

GB5175772A
1971-11-12
1972-11-09
Magnetic domain store

Expired

GB1395592A
(en)

Applications Claiming Priority (1)

Application Number
Priority Date
Filing Date
Title

NL7115628A

NL7115628A
(en)

1971-11-12
1971-11-12

Publications (1)

Publication Number
Publication Date

GB1395592A
true

GB1395592A
(en)

1975-05-29

Family
ID=19814472
Family Applications (1)

Application Number
Title
Priority Date
Filing Date

GB5175772A
Expired

GB1395592A
(en)

1971-11-12
1972-11-09
Magnetic domain store

Country Status (8)

Country
Link

US
(1)

US3787825A
(en)

BE
(1)

BE791239A
(en)

CA
(1)

CA966581A
(en)

DE
(1)

DE2254046B2
(en)

FR
(1)

FR2159521B1
(en)

GB
(1)

GB1395592A
(en)

NL
(1)

NL7115628A
(en)

SE
(1)

SE376504B
(en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

BE791317A
(en)

*

1971-11-13
1973-05-14
Philips Nv

OPTO-MAGNETIC MEMORY

NL7203555A
(en)

*

1972-03-17
1973-09-19

JPS5329415B2
(en)

*

1973-03-05
1978-08-21

IT1123608B
(en)

*

1975-08-11
1986-04-30
Sperry Rand Corp

TRANSISTOR MATRIX ACCESSIBLE TO LIGHT WITH SINGLE WALL DOMAINS FOR AN OPTICAL DATA PROCESSING SYSTEM

US4040039A
(en)

*

1975-08-11
1977-08-02
Sperry Rand Corporation
Single wall domain latrix for optical data processing system

JPS59180806A
(en)

*

1983-03-31
1984-10-15
Sony Corp
Bit shifting method for thermal magneto-optic recording system

DE3483671D1
(en)

*

1983-03-31
1991-01-10
Sony Corp

THERMOMAGNETIC OPTICAL RECORDING METHOD.

DE3542279A1
(en)

*

1984-11-30
1986-06-05
Canon K.K., Tokio/Tokyo
Recording and/or reproducing method for Bloch-line memories

DE3607346A1
(en)

*

1986-03-06
1987-09-10
Philips Patentverwaltung

MAGNETO-OPTICAL LIGHT SWITCHING ELEMENT AND METHOD FOR THE PRODUCTION THEREOF

DE3607345A1
(en)

*

1986-03-06
1987-09-10
Philips Patentverwaltung

MAGNETO-OPTICAL LIGHT SWITCHING ELEMENT AND METHOD FOR THE PRODUCTION THEREOF

US4872078A
(en)

*

1986-04-24
1989-10-03
International Business Machines Corporation
Method and apparatus for encoding and direct overwriting of magneto-optic data

Family Cites Families (7)

* Cited by examiner, † Cited by third party

Publication number
Priority date
Publication date
Assignee
Title

US3150356A
(en)

*

1961-12-22
1964-09-22
Ibm
Magnetic patterns

US3164816A
(en)

*

1963-12-18
1965-01-05
Bell Telephone Labor Inc
Magnetic-optical information storage unit and apparatus

GB1143836A
(en)

*

1965-05-26

US3506974A
(en)

*

1967-04-11
1970-04-14
Bell Telephone Labor Inc
Magnetic memory implementation

US3503054A
(en)

*

1967-10-12
1970-03-24
Bell Telephone Labor Inc
Domain wall propagation in magnetic shefts

US3729724A
(en)

*

1971-06-08
1973-04-24
Ibm
High-density magneto-optic readout apparatus

US3696346A
(en)

*

1971-08-30
1972-10-03
Honeywell Inc
Beam addressed optical memory

0

BE
BE791239D
patent/BE791239A/en
unknown

1971

1971-11-12
NL
NL7115628A
patent/NL7115628A/xx
unknown

1972

1972-11-04
DE
DE19722254046
patent/DE2254046B2/en
active
Granted

1972-11-06
US
US00303980A
patent/US3787825A/en
not_active
Expired – Lifetime

1972-11-09
SE
SE7214523A
patent/SE376504B/xx
unknown

1972-11-09
GB
GB5175772A
patent/GB1395592A/en
not_active
Expired

1972-11-13
FR
FR7240180A
patent/FR2159521B1/fr
not_active
Expired

1972-11-14
CA
CA156,299A
patent/CA966581A/en
not_active
Expired

Also Published As

Publication number
Publication date

NL7115628A
(en)

1973-05-15

DE2254046B2
(en)

1976-09-02

FR2159521A1
(en)

1973-06-22

BE791239A
(en)

1973-05-10

DE2254046A1
(en)

1973-05-17

FR2159521B1
(en)

1976-01-30

US3787825A
(en)

1974-01-22

SE376504B
(en)

1975-05-26

CA966581A
(en)

1975-04-22

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Legal Events

Date
Code
Title
Description

1975-10-08
PS
Patent sealed [section 19, patents act 1949]

1981-06-24
PCNP
Patent ceased through non-payment of renewal fee

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