GB1102721A - A reading arrangement for a magnetic memory - Google Patents

A reading arrangement for a magnetic memory

Info

Publication number
GB1102721A
GB1102721A GB2119865A GB2119865A GB1102721A GB 1102721 A GB1102721 A GB 1102721A GB 2119865 A GB2119865 A GB 2119865A GB 2119865 A GB2119865 A GB 2119865A GB 1102721 A GB1102721 A GB 1102721A
Authority
GB
United Kingdom
Prior art keywords
head
flux
conveyer
magnetic
spot
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
GB2119865A
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.)
Filing date
Publication date
Application filed by Philips Electronic and Associated Industries Ltd filed Critical Philips Electronic and Associated Industries Ltd
Publication of GB1102721A publication Critical patent/GB1102721A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C3/00—Sorting according to destination
    • B07C3/003—Destination control; Electro-mechanical or electro- magnetic delay memories
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07C—POSTAL SORTING; SORTING INDIVIDUAL ARTICLES, OR BULK MATERIAL FIT TO BE SORTED PIECE-MEAL, e.g. BY PICKING
    • B07C5/00—Sorting according to a characteristic or feature of the articles or material being sorted, e.g. by control effected by devices which detect or measure such characteristic or feature; Sorting by manually actuated devices, e.g. switches
    • B07C5/36—Sorting apparatus characterised by the means used for distribution
    • B07C5/361—Processing or control devices therefor, e.g. escort memory

Landscapes

  • Recording Or Reproducing By Magnetic Means (AREA)
  • Measuring Magnetic Variables (AREA)

Abstract

1,102,721. Recording and playback. PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd. 19 May, 1965 [22 May, 1964], No. 21198/65. Heading G5R. [Also in Division B8] To determine the position of a magnetic spot on a magnetizable carrier, a head arranged with its sensing direction perpendicular to the carrier surface detects the flux component at rightangles to the surface. When an indicator connected to the head shows that the flux sensed by the head is passing through zero, the position of the spot is determined. The system is of use in determining at which times to unload goods from a conveyer. A drum with a magnetic surface having a permanent magnetic polarization rotates in conjunction with the movement of the conveyer and has a number of tracks corresponding to the number of possible unloading stations. When an item is loaded on to the conveyer a write head on the appropriate track is energized to provide a magnetic spot on the drum. When the spot subsequently passes a corresponding read-head, the zero passage of the perpendicular component of the magnetic flux is sensed and the signal used to operate the corresponding unloading mechanism of the conveyer. Read-head.-The head for sensing the static perpendicular flux component may consist of a sense winding 20 with its axis in the perpendicular direction inside which is a core 21 of square loop material carrying windings 22, 23 to which a 50 kc/s. switching signal is applied. No voltage is induced in the winding 20 in the absence of an external field, due to the arrangement of the windings 22, 23, but when an external static flux links the core, an output signal of amplitude determined by this flux and of twice the switching frequency will be obtained from the winding 20. This signal is passed via a filter and a phase-sensitive rectifier to an amplifier discriminator arrangement which produces a pulse when the flux signal passes through zero. Alternatively a read-head comprising a Hall element can be used for the static reading of the perpendicular field.
GB2119865A 1964-05-22 1965-05-19 A reading arrangement for a magnetic memory Expired GB1102721A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE625264A SE329039B (en) 1964-05-22 1964-05-22

Publications (1)

Publication Number Publication Date
GB1102721A true GB1102721A (en) 1968-02-07

Family

ID=20268232

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2119865A Expired GB1102721A (en) 1964-05-22 1965-05-19 A reading arrangement for a magnetic memory

Country Status (4)

Country Link
DE (1) DE1474423A1 (en)
FR (1) FR1433294A (en)
GB (1) GB1102721A (en)
SE (1) SE329039B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117166A (en) * 1982-02-25 1983-10-05 Staar Sa System for detecting the operative face of a disc carrying data on one face only
CN111701871A (en) * 2020-06-23 2020-09-25 中国科学院上海高等研究院 Magnetic core selection device and method for magnetic balance direct current sensor

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2658956A1 (en) * 1976-12-24 1978-06-29 Ibm Deutschland Magnetic recording material with extremely high bit density - using anisotropic alloys of gadolinium with iron or cobalt

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2117166A (en) * 1982-02-25 1983-10-05 Staar Sa System for detecting the operative face of a disc carrying data on one face only
CN111701871A (en) * 2020-06-23 2020-09-25 中国科学院上海高等研究院 Magnetic core selection device and method for magnetic balance direct current sensor

Also Published As

Publication number Publication date
SE329039B (en) 1970-09-28
DE1474423A1 (en) 1969-07-10
FR1433294A (en) 1966-03-25

Similar Documents

Publication Publication Date Title
US3918091A (en) Device for controlling the position of a magnetic head with respect to an information track to be followed
US4967184A (en) Computer disk with security protection
GB814942A (en) Improvements in or relating to magnetic systems and devices
US3435440A (en) Null sweeping head
GB1095135A (en) A magnetic recording process
US3959824A (en) Two gap read/write head assembly
US3796859A (en) Magnetic ink recording system to both magnetize and read ink
US2819940A (en) Drive controls for magnetic recorder-reproducer
US4130242A (en) Data storage and retrieval system employing balanced magnetic circuits
GB752415A (en) Improvements in or relating to devices for reading magnetically recorded coded information
GB1102721A (en) A reading arrangement for a magnetic memory
US2680156A (en) Magnetic head for perpendicular recording
GB1079084A (en) Magnetic a/d encoder
US2961645A (en) Magnetic transducer
ES337736A1 (en) Magnetic read/write head which senses data track lateral alignment error
US2975239A (en) Electromagnetic eraser
US2928078A (en) Magnetic transducer
GB771383A (en) Multi-channel, flux responsive, magnetic reproducer head unit
US3521258A (en) Transducer with thin magnetic strip,drive winding and sense winding
US3399393A (en) Two-probe three-gap flux sensitive magnetic head
US3167777A (en) Recording and reproducing system
US2862199A (en) Magnetic drum storage system
GB959783A (en) Digital data read-out device
US2747024A (en) Magnetic erase heads
GB1118652A (en) Magnetic ticket