FR2390778A1 - Dispositif de lecture d'informations magnetiques - Google Patents
Dispositif de lecture d'informations magnetiquesInfo
- Publication number
- FR2390778A1 FR2390778A1 FR7714661A FR7714661A FR2390778A1 FR 2390778 A1 FR2390778 A1 FR 2390778A1 FR 7714661 A FR7714661 A FR 7714661A FR 7714661 A FR7714661 A FR 7714661A FR 2390778 A1 FR2390778 A1 FR 2390778A1
- Authority
- FR
- France
- Prior art keywords
- magnetic
- information
- reading device
- magneto
- information reading
- 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.)
- Granted
Links
- 238000001514 detection method Methods 0.000 abstract 2
- 230000026683 transduction Effects 0.000 abstract 2
- 238000010361 transduction Methods 0.000 abstract 2
- 230000006698 induction Effects 0.000 abstract 1
- 230000005415 magnetization Effects 0.000 abstract 1
- 230000003071 parasitic effect Effects 0.000 abstract 1
Classifications
-
- 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
- G11B5/127—Structure or manufacture of heads, e.g. inductive
- G11B5/33—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only
- G11B5/39—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects
- G11B5/3903—Structure or manufacture of flux-sensitive heads, i.e. for reproduction only; Combination of such heads with means for recording or erasing only using magneto-resistive devices or effects using magnetic thin film layers or their effects, the films being part of integrated structures
- G11B5/3906—Details related to the use of magnetic thin film layers or to their effects
- G11B5/3945—Heads comprising more than one sensitive element
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
- G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
- G06K1/125—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by magnetic means
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
- G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
- G06K7/087—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors flux-sensitive, e.g. magnetic, detectors
-
- G—PHYSICS
- G11—INFORMATION STORAGE
- G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
- G11B23/00—Record carriers not specific to the method of recording or reproducing; Accessories, e.g. containers, specially adapted for co-operation with the recording or reproducing apparatus ; Intermediate mediums; Apparatus or processes specially adapted for their manufacture
- G11B23/0007—Circuits or methods for reducing noise, for correction of distortion, or for changing density of recorded information
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Artificial Intelligence (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Measuring Magnetic Variables (AREA)
- Magnetic Heads (AREA)
- Recording Or Reproducing By Magnetic Means (AREA)
- Signal Processing For Digital Recording And Reproducing (AREA)
Abstract
Dispositif de lecture d'informations magnétiques comprenant un dispositif d'aimantation des informations et un dispositif de transduction magnétique de détection desdites informations. Selon l'invention, le dispositif de lecture est caractérisé en ce que : 1 degrés Le dispositif d'aimantation comprend au moins une couche magnétique comportant une succession de zones adjacentes de longueurs d1 et d2 , telles que d2 beaucoup plus grande que d1 , celles-ci ayant des inductions magnétiques de sens opposés; 2 degrés Le disporitif de transduction magnétique comprend au moins un élément magnéto-résistant de détection des informations et un élément magnéto-résistant de compensation disposé à proximité dudit élément de détection à une distance telle qu'il soit sensible aux mêmes champs parasites que celui-ci. Applicable aux lecteurs de chéques.
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7714661A FR2390778A1 (fr) | 1977-05-13 | 1977-05-13 | Dispositif de lecture d'informations magnetiques |
ES467766A ES467766A1 (es) | 1977-05-13 | 1978-03-10 | Dispositivo de lectura de informaciones magneticas. |
NL7802749A NL7802749A (nl) | 1977-05-13 | 1978-03-14 | Leesinrichting voor magnetische informatie. |
IT22172/78A IT1109814B (it) | 1977-05-13 | 1978-04-11 | Dispositivo di lettura di informazioni magentiche |
GB14413/78A GB1603553A (en) | 1977-05-13 | 1978-04-12 | Device for reading magnetic information |
US05/899,217 US4184631A (en) | 1977-05-13 | 1978-04-24 | Device for reading information magnetically coded on a carrier |
BR7802557A BR7802557A (pt) | 1977-05-13 | 1978-04-25 | Dispositivo de leitura de informacoes magneticas |
JP53055044A JPS5842900B2 (ja) | 1977-05-13 | 1978-05-11 | 磁気情報を読取るための装置 |
DE19782820835 DE2820835C3 (de) | 1977-05-13 | 1978-05-12 | Magnetische Leseeinrichtung |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR7714661A FR2390778A1 (fr) | 1977-05-13 | 1977-05-13 | Dispositif de lecture d'informations magnetiques |
Publications (2)
Publication Number | Publication Date |
---|---|
FR2390778A1 true FR2390778A1 (fr) | 1978-12-08 |
FR2390778B1 FR2390778B1 (fr) | 1980-02-01 |
Family
ID=9190763
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR7714661A Granted FR2390778A1 (fr) | 1977-05-13 | 1977-05-13 | Dispositif de lecture d'informations magnetiques |
Country Status (8)
Country | Link |
---|---|
US (1) | US4184631A (fr) |
JP (1) | JPS5842900B2 (fr) |
BR (1) | BR7802557A (fr) |
ES (1) | ES467766A1 (fr) |
FR (1) | FR2390778A1 (fr) |
GB (1) | GB1603553A (fr) |
IT (1) | IT1109814B (fr) |
NL (1) | NL7802749A (fr) |
Families Citing this family (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2443733A1 (fr) * | 1978-12-08 | 1980-07-04 | Thomson Csf | Tete de lecture magnetique et lecteur muni d'une telle tete |
JPS58154615A (ja) * | 1982-03-10 | 1983-09-14 | Copal Co Ltd | 磁気検出装置 |
US4639584A (en) * | 1985-07-25 | 1987-01-27 | Adams Robert T | Non-alterable magnetic coding |
US4962437A (en) * | 1988-02-24 | 1990-10-09 | Magnetic Peripherals Inc. | Thin film servo head employing the inactive transducer coils to cancel write noise from nearby data heads |
US4954803A (en) * | 1988-03-18 | 1990-09-04 | Yamaha Corporation | Magnetic-resistor sensor and a magnetic encoder using such a sensor |
US5266786A (en) * | 1991-10-01 | 1993-11-30 | Ncr Corporation | Magnetoresistive head for reading magnetic ink characters |
US20060110023A1 (en) * | 2004-11-24 | 2006-05-25 | Goetz Ronald J | Document validation device |
Family Cites Families (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3509535A (en) * | 1966-06-09 | 1970-04-28 | Arcs Ind Inc | Ferromagnetic recognizer of documents |
US3959824A (en) * | 1970-11-30 | 1976-05-25 | Tohoku Metal Industries Limited | Two gap read/write head assembly |
FR2165206A5 (fr) * | 1971-12-22 | 1973-08-03 | Cii | |
US3945038A (en) * | 1971-12-22 | 1976-03-16 | Compagnie Internationale Pour L'informatique | Read-write magnetoresistive transducer having a plurality of MR elements |
US3796859A (en) * | 1971-12-27 | 1974-03-12 | Ibm | Magnetic ink recording system to both magnetize and read ink |
NL7405727A (nl) * | 1974-04-29 | 1975-10-31 | Philips Nv | Magnetoweerstandkop. |
GB1519142A (en) * | 1974-07-04 | 1978-07-26 | Emi Ltd | Detection of magnetic patterns |
US4072994A (en) * | 1974-12-28 | 1978-02-07 | Canon Kabushiki Kaisha | Read-after-write head |
NL168981C (nl) * | 1975-04-15 | 1982-05-17 | Philips Nv | Magnetoweerstand leeskop. |
US4008493A (en) * | 1975-07-11 | 1977-02-15 | Pizzuto John N | Magnetic head structure with minimum feedthrough |
US4087789A (en) * | 1977-04-27 | 1978-05-02 | Burroughs Corporation | Magnetic ink character recognition system |
-
1977
- 1977-05-13 FR FR7714661A patent/FR2390778A1/fr active Granted
-
1978
- 1978-03-10 ES ES467766A patent/ES467766A1/es not_active Expired
- 1978-03-14 NL NL7802749A patent/NL7802749A/xx not_active Application Discontinuation
- 1978-04-11 IT IT22172/78A patent/IT1109814B/it active
- 1978-04-12 GB GB14413/78A patent/GB1603553A/en not_active Expired
- 1978-04-24 US US05/899,217 patent/US4184631A/en not_active Expired - Lifetime
- 1978-04-25 BR BR7802557A patent/BR7802557A/pt unknown
- 1978-05-11 JP JP53055044A patent/JPS5842900B2/ja not_active Expired
Also Published As
Publication number | Publication date |
---|---|
IT7822172A0 (it) | 1978-04-11 |
JPS5842900B2 (ja) | 1983-09-22 |
FR2390778B1 (fr) | 1980-02-01 |
ES467766A1 (es) | 1978-11-16 |
BR7802557A (pt) | 1978-12-26 |
IT1109814B (it) | 1985-12-23 |
DE2820835C2 (de) | 1983-03-24 |
GB1603553A (en) | 1981-11-25 |
JPS53141544A (en) | 1978-12-09 |
NL7802749A (nl) | 1978-11-15 |
DE2820835A1 (de) | 1978-11-23 |
US4184631A (en) | 1980-01-22 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
ST | Notification of lapse |