GB1375087A - - Google Patents

Info

Publication number
GB1375087A
GB1375087A GB4498772A GB4498772A GB1375087A GB 1375087 A GB1375087 A GB 1375087A GB 4498772 A GB4498772 A GB 4498772A GB 4498772 A GB4498772 A GB 4498772A GB 1375087 A GB1375087 A GB 1375087A
Authority
GB
United Kingdom
Prior art keywords
plates
card
plate
voltage
capacitors
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
GB4498772A
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 filed Critical
Priority to GB4498772A priority Critical patent/GB1375087A/en
Publication of GB1375087A publication Critical patent/GB1375087A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G06K7/081—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 electrostatic, e.g. by detecting the charge of capacitance between electrodes

Abstract

1375087 Identity card: key REMVAC SYSTEMS CORP 29 Sept 1972 44987/72 Headings B6A A42A and A42D An identity card or a key 10 contains conductive plates in a plastics coating. A central plate 15 is joined to smaller plates 20 arranged in rows by strips 22 which may be broken or left complete to represent bits of data. A reader for the card has a slot receiving the card such that the card can only be inserted one way round to operate a voltage supply switch S. The reader has a central plate 28 corresponding to plate 15 and connected via the switch to a voltage source with smaller plates 33 in rows corresponding to plates 20 each being connected to a detector. The two pairs of plates 28, 15 and 33, 21 form two capacitors in series and if strip 21 is complete a voltage applied to strip 28 charges the capacitors and the charging current and voltage at plate 33 is detected by MOSFET 85 to operate S.C.R. 86.
GB4498772A 1972-09-29 1972-09-29 Expired GB1375087A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB4498772A GB1375087A (en) 1972-09-29 1972-09-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB4498772A GB1375087A (en) 1972-09-29 1972-09-29

Publications (1)

Publication Number Publication Date
GB1375087A true GB1375087A (en) 1974-11-27

Family

ID=10435469

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4498772A Expired GB1375087A (en) 1972-09-29 1972-09-29

Country Status (1)

Country Link
GB (1) GB1375087A (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485231A1 (en) * 1980-06-20 1981-12-24 Computrol Systems Ltd ELECTRONIC IDENTIFICATION SYSTEM
US4587410A (en) * 1984-04-09 1986-05-06 Milnes Arthur G Capacitive card and reader parking system
GB2185440A (en) * 1986-01-17 1987-07-22 Sato Kenneth Douglas Magnetic card
US4857828A (en) * 1986-05-30 1989-08-15 Control Logic (Proprietary) Limited Method and apparatus for detecting presence of objects
GB2455779A (en) * 2007-12-21 2009-06-24 Novalia Ltd Reader and electronic tag with conductive tracks having narrow and wide sections

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2485231A1 (en) * 1980-06-20 1981-12-24 Computrol Systems Ltd ELECTRONIC IDENTIFICATION SYSTEM
US4587410A (en) * 1984-04-09 1986-05-06 Milnes Arthur G Capacitive card and reader parking system
GB2185440A (en) * 1986-01-17 1987-07-22 Sato Kenneth Douglas Magnetic card
US4857828A (en) * 1986-05-30 1989-08-15 Control Logic (Proprietary) Limited Method and apparatus for detecting presence of objects
GB2455779A (en) * 2007-12-21 2009-06-24 Novalia Ltd Reader and electronic tag with conductive tracks having narrow and wide sections

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee