GB1445948A - Erasing a visible magnetic record medium - Google Patents
Erasing a visible magnetic record mediumInfo
- Publication number
- GB1445948A GB1445948A GB5132874A GB5132874A GB1445948A GB 1445948 A GB1445948 A GB 1445948A GB 5132874 A GB5132874 A GB 5132874A GB 5132874 A GB5132874 A GB 5132874A GB 1445948 A GB1445948 A GB 1445948A
- Authority
- GB
- United Kingdom
- Prior art keywords
- magnetic
- record medium
- medium
- erasing
- magnetic record
- Prior art date
- 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
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F13/00—Apparatus or processes for magnetising or demagnetising
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/12—Measuring magnetic properties of articles or specimens of solids or fluids
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/02—Recording, reproducing, or erasing methods; Read, write or erase circuits therefor
- G11B5/027—Analogue recording
- G11B5/03—Biasing
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
- G11C19/08—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11C—STATIC STORES
- G11C19/00—Digital stores in which the information is moved stepwise, e.g. shift registers
- G11C19/02—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements
- G11C19/08—Digital stores in which the information is moved stepwise, e.g. shift registers using magnetic elements using thin films in plane structure
- G11C19/085—Generating magnetic fields therefor, e.g. uniform magnetic field for magnetic domain stabilisation
Landscapes
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Magnetic Heads (AREA)
- Manufacturing Of Magnetic Record Carriers (AREA)
Abstract
1445948 Magnetic erasing heads HONEYWELL Inc 27 Nov 1974 [29 Nov 1973] 51328/74 Addition to 1319047 Heading G5R A web-form magnetic record medium 2, e.g. of the kind containing particles orientable in response to a magnetic field, is passed between two U-section magnetic cores 4, 6 having windings 8, 9, 16, 20 and power supplies 12, 18 such as to produce a steady magnetic field passing transversely through the medium 2, Fig. 3, and an alternating field passing longitudinally through the medium 2, Fig. 2. The resultant field rotates in an oscillatory manner.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US420284A US3879754A (en) | 1973-11-29 | 1973-11-29 | Magnetic field producing apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1445948A true GB1445948A (en) | 1976-08-11 |
Family
ID=23665854
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5132874A Expired GB1445948A (en) | 1973-11-29 | 1974-11-27 | Erasing a visible magnetic record medium |
Country Status (4)
Country | Link |
---|---|
US (1) | US3879754A (en) |
JP (1) | JPS571045B2 (en) |
CA (1) | CA1035035A (en) |
GB (1) | GB1445948A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3736024C1 (en) * | 1987-10-24 | 1989-03-23 | Agfa Gevaert Ag | Demagnetising device |
Families Citing this family (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4063296A (en) * | 1974-07-08 | 1977-12-13 | Simrad A.S. | Method and means for erasing recordings on magnetic paper, particularly for distance measuring equipment |
DE2520581C3 (en) * | 1975-05-09 | 1980-09-04 | Kienzle Apparate Gmbh, 7730 Villingen-Schwenningen | Arrangement for erasable recording of measured quantities |
US4107653A (en) * | 1977-05-23 | 1978-08-15 | Burroughs Corporation | Document processing, magnetic character detecting apparatus |
FR2408890A1 (en) * | 1977-11-10 | 1979-06-08 | Transac Dev Transact Automat | METHOD AND DEVICE FOR ORIENTATION AND FIXATION IN A DETERMINED DIRECTION OF MAGNETIC PARTICLES CONTAINED IN A POLYMERISABLE INK |
US4286295A (en) * | 1979-06-22 | 1981-08-25 | George Ipolyi | Device for erasing visible recorded signals from a recording medium having oriented magnetic components |
FR2476375A1 (en) * | 1980-02-15 | 1981-08-21 | Aimants Ugimag Sa | DEVICE FOR THE MULTIPOLAR MAGNET OF BAND MATERIAL |
US4346426A (en) * | 1981-01-07 | 1982-08-24 | Fluxcom, Inc. | Magnetic tape de-gausser and method of erasing magnetic recording tape |
US4466034A (en) * | 1982-12-27 | 1984-08-14 | Magnetic Peripherals Inc. | Carriage assembly |
JPH0823925B2 (en) * | 1984-07-31 | 1996-03-06 | 株式会社東芝 | Magnetic recording / reproducing device |
US4758742A (en) * | 1987-04-14 | 1988-07-19 | Echlin Inc. | Shunt activated pulse generator |
JPH02132603A (en) * | 1988-11-11 | 1990-05-22 | Fuji Photo Film Co Ltd | Magneto-optical disk initializing method |
US5317340A (en) * | 1990-08-23 | 1994-05-31 | Mody Hemant K | Method and device for erasing and writing on magnetic recording media suitable for direct viewing |
US5969933A (en) * | 1998-03-25 | 1999-10-19 | Data Security, Inc. | Transient magnet field degaussing system |
US5959824A (en) * | 1998-03-25 | 1999-09-28 | Data Security, Inc. | Transient magnetic field degaussing system with auto calibration |
US6731491B2 (en) | 2001-06-15 | 2004-05-04 | Data Security, Inc. | Bulk degausser with fixed arrays of magnet poles |
US7164569B1 (en) | 2004-06-30 | 2007-01-16 | Data Security, Inc. | Mechanism for automated permanent magnet degaussing |
US20060018075A1 (en) * | 2004-07-23 | 2006-01-26 | Data Security, Inc. | Permanent magnet bulk degausser |
US7715166B2 (en) * | 2006-07-14 | 2010-05-11 | Data Security, Inc. | Method and reciprocating apparatus for permanent magnet erasure of magnetic storage media |
US7701656B2 (en) * | 2006-07-14 | 2010-04-20 | Data Security, Inc. | Method and apparatus for permanent magnet erasure of magnetic storage media |
US8206793B2 (en) * | 2008-03-26 | 2012-06-26 | Reald Inc. | Enhanced projection screen |
US20090284890A1 (en) * | 2008-05-16 | 2009-11-19 | Thiel Leroy D | Mechanism and Method for Permanent Magnet Degaussing |
US20140211360A1 (en) * | 2009-06-02 | 2014-07-31 | Correlated Magnetics Research, Llc | System and method for producing magnetic structures |
DE102018007179A1 (en) | 2017-09-22 | 2019-03-28 | Albert Maurer | Device for demagnetizing long-configured components and method for demagnetizing such components |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2604550A (en) * | 1947-01-21 | 1952-07-22 | Brush Dev Co | Erase head for use with commercial alternating current or equivalent |
US2498423A (en) * | 1947-04-17 | 1950-02-21 | Indiana Steel Products Co | Means for demagnetizing high coercive force materials |
US2550753A (en) * | 1949-06-22 | 1951-05-01 | Rca Corp | Erasing head for magnetic recorders |
US2908768A (en) * | 1955-04-13 | 1959-10-13 | Steinegger Giovanni | Device for demagnetizing the magnetized wire of a sound recording and reproducing apparatus |
US2928078A (en) * | 1956-08-16 | 1960-03-08 | Ibm | Magnetic transducer |
US3449529A (en) * | 1965-08-02 | 1969-06-10 | Iit Res Inst | Erase head |
-
1973
- 1973-11-29 US US420284A patent/US3879754A/en not_active Expired - Lifetime
-
1974
- 1974-08-28 CA CA207,975A patent/CA1035035A/en not_active Expired
- 1974-11-27 GB GB5132874A patent/GB1445948A/en not_active Expired
- 1974-11-29 JP JP13768474A patent/JPS571045B2/ja not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3736024C1 (en) * | 1987-10-24 | 1989-03-23 | Agfa Gevaert Ag | Demagnetising device |
Also Published As
Publication number | Publication date |
---|---|
JPS571045B2 (en) | 1982-01-09 |
US3879754A (en) | 1975-04-22 |
JPS5087621A (en) | 1975-07-14 |
CA1035035A (en) | 1978-07-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed [section 19, patents act 1949] |