GB856755A - Improvements in apparatus for reading marks of magnetizable material on records - Google Patents

Improvements in apparatus for reading marks of magnetizable material on records

Info

Publication number
GB856755A
GB856755A GB23896/57A GB2389657A GB856755A GB 856755 A GB856755 A GB 856755A GB 23896/57 A GB23896/57 A GB 23896/57A GB 2389657 A GB2389657 A GB 2389657A GB 856755 A GB856755 A GB 856755A
Authority
GB
United Kingdom
Prior art keywords
mark
frequency
line
oscillator
winding
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
Application number
GB23896/57A
Other languages
English (en)
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.)
International Business Machines Corp
Original Assignee
International Business Machines Corp
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.)
Filing date
Publication date
Application filed by International Business Machines Corp filed Critical International Business Machines Corp
Publication of GB856755A publication Critical patent/GB856755A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Burglar Alarm Systems (AREA)
  • Recording Or Reproducing By Magnetic Means (AREA)
  • Measuring Magnetic Variables (AREA)
GB23896/57A 1957-01-28 1957-07-29 Improvements in apparatus for reading marks of magnetizable material on records Expired GB856755A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US636642A US2875429A (en) 1957-01-28 1957-01-28 Phase sensitive magnetic head

Publications (1)

Publication Number Publication Date
GB856755A true GB856755A (en) 1960-12-21

Family

ID=24552743

Family Applications (1)

Application Number Title Priority Date Filing Date
GB23896/57A Expired GB856755A (en) 1957-01-28 1957-07-29 Improvements in apparatus for reading marks of magnetizable material on records

Country Status (5)

Country Link
US (1) US2875429A (enExample)
DE (1) DE1088726B (enExample)
FR (1) FR1202124A (enExample)
GB (1) GB856755A (enExample)
NL (2) NL224365A (enExample)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1256926B (de) * 1964-03-07 1967-12-21 Olympia Werke Ag Abtastvorrichtung fuer gelochte Aufzeichnungstraeger
DE1286792B (de) * 1965-02-11 1969-01-09 Plessey Company U K Ltd Durch Einfuehrung einer einen magnetischen oder elektrischen Auftrag tragenden Fahrkarte od. dgl. gegen einen Anschlag ausgeloeste elektrische Steuereinrichtung

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3045220A (en) * 1957-12-11 1962-07-17 Armour Res Found Magnetic modulator system
US3103653A (en) * 1958-10-20 1963-09-10 Westinghouse Electric Corp Indicational system for electromagnets
US3071774A (en) * 1959-08-07 1963-01-01 Standard Conveyor Co Magnetic recorders
FR1296703A (fr) * 1961-05-10 1962-06-22 Saxby Ets Détecteur de passage pour la signalisation ferroviaire
US3209245A (en) * 1961-12-05 1965-09-28 Gen Electric Inductive metal detection device
US3281825A (en) * 1963-01-25 1966-10-25 United Aircraft Corp Non-contacting encoder
NL298177A (enExample) * 1963-01-30
US3293636A (en) * 1963-07-22 1966-12-20 Unimation Inc Magnetic flux responsive sensing device
DE1239363B (de) * 1963-12-04 1967-04-27 Standard Elektrik Lorenz Ag Schaltungsanordnung mit magnetischen Koppelelementen zur Codeumsetzung, insbesondere in Fernsprechvermittlungsanlagen
US3508031A (en) * 1965-08-23 1970-04-21 Ind Instrumentations Inc Control system employing card having conductive inserts
FR1509926A (fr) * 1966-03-21 1968-01-19 Saint Gobain Techn Nouvelles Circuit multiplicateur scalaire
US3505595A (en) * 1966-10-20 1970-04-07 Robert Favre Rotational speed sensor utilizing the phase shift caused by superposition of an a.c. signal in the sensor and a signal induced from the rotating body
US3557321A (en) * 1967-10-25 1971-01-19 Nippon Electronics Co Ltd System for detecting a magnetic thin film
US3435443A (en) * 1968-03-05 1969-03-25 Molins Organisation Ltd Flux sensitive transducer with tuned resonant circuit
US3896371A (en) * 1973-12-17 1975-07-22 Allen W Hametta Metal detector with a resonating circuit being driven by a frequency higher than its natural resonance frequency
US4005359A (en) * 1975-11-07 1977-01-25 Smoot William N Resonant frequency measuring device for gauging coating thickness
JP2005181173A (ja) * 2003-12-22 2005-07-07 Toshiba Corp 磁性体量検出装置

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2722569A (en) * 1951-04-12 1955-11-01 Socony Mobil Oil Co Inc Reproduction of low-frequency magnetically recorded signals

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1256926B (de) * 1964-03-07 1967-12-21 Olympia Werke Ag Abtastvorrichtung fuer gelochte Aufzeichnungstraeger
DE1286792B (de) * 1965-02-11 1969-01-09 Plessey Company U K Ltd Durch Einfuehrung einer einen magnetischen oder elektrischen Auftrag tragenden Fahrkarte od. dgl. gegen einen Anschlag ausgeloeste elektrische Steuereinrichtung

Also Published As

Publication number Publication date
DE1088726C2 (enExample) 1961-03-09
US2875429A (en) 1959-02-24
NL224365A (enExample)
FR1202124A (fr) 1960-01-07
NL224364A (enExample)
DE1088726B (de) 1960-09-08

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