US3668596A - Magnetic keys - Google Patents

Magnetic keys Download PDF

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Publication number
US3668596A
US3668596A US83753A US3668596DA US3668596A US 3668596 A US3668596 A US 3668596A US 83753 A US83753 A US 83753A US 3668596D A US3668596D A US 3668596DA US 3668596 A US3668596 A US 3668596A
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US
United States
Prior art keywords
slide
magnet
key according
positions
pole
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 - Lifetime
Application number
US83753A
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English (en)
Inventor
Rudolf Hubrich
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.)
Rafi Raimund Finsterholzl Elektrotechnische Spezialfabrik
Original Assignee
Finsterhoelzl Rafi Elekt
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 Finsterhoelzl Rafi Elekt filed Critical Finsterhoelzl Rafi Elekt
Application granted granted Critical
Publication of US3668596A publication Critical patent/US3668596A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
    • H03K17/965—Switches controlled by moving an element forming part of the switch
    • H03K17/97—Switches controlled by moving an element forming part of the switch using a magnetic movable element
    • H03K17/972—Switches controlled by moving an element forming part of the switch using a magnetic movable element having a plurality of control members, e.g. keyboard
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
    • H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
    • H03K17/90—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of galvano-magnetic devices, e.g. Hall-effect devices
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K3/00—Circuits for generating electric pulses; Monostable, bistable or multistable circuits

Definitions

  • ABSTRACT A magnetic key suitable for use with electronic equipment comprises a magnetically controllable semiconductor device [30] Foreign Appnmhon Pnomy Data mounted between two soft iron pole pieces, and a permanent July I, 1970 Germany G 70 24 6434 magnet movable relative to the device. The magnet is carried by a slide movable between two positions and biased by a 52 us. c1.
  • One object of the present invention is to provide a new or improved magnetic key.
  • Another object of the present invention is to provide a particularly advantageous form of magnetic key, which is simple and therefore cheap to produce, and with which good durability and great security of operation is also obtained.
  • a magnetic key comprising a casing, a slide mounted in the casing for linear movement between two positions, spring means urging the slide towards one of said positions, apermanent magnet carried by the slide and having a North pole and a South polealigned in the direction of said movement of the slide, two pole pieces mounted within the casing, a magnetically controllable semiconductor device mounted between the pole pieces, the arrangement being such that in one of said positions of the slide said two poles of the magnet are adjacent to the two pole pieces respectively-whereby a substantial part of the magnetic flux of the magnet passes through said device, and in the other of said positions of the slide said two poles of the magnet are both adjacent to one of the two pole pieces.
  • the casing is preferably of plastics material and has on the inside two grooves disposed parallel to said direction, and the slide is provided with two rib-like projections slidable in respective grooves.
  • the two pole pieces prefferably be plate-shaped and made of magnetically soft iron.
  • said device is plate-shaped, the end faces of the two pole pieces which face towards one another are parallel with one another and substantially perpendicular to said direction, and the two large surfaces of said device extend perpendicular to said direction.
  • FIG. 1 is a longitudinal section through the key;
  • FIG. 2 is a section on the line A'B of FIG.. I; and
  • F IG. 3 is a constructional detail on a larger scale.
  • the magnetic key comprises a plastics case 1, in which a plastics slide 2, arranged at right angles, is movably mounted and linearly displaceable against the force of a spring 3 between two limit positions.
  • the slide 2 is provided on two opposite sides with projecting ribs 4 and 4', respectively; the ribs 4 and 4 being guided in corresponding grooves 5 and 5 respectively in the case 1.
  • the slide 2 carries a generally U-shaped permanent magnet 6 with its North and South poles aligned on behind the other in the direction of movement of the slide 2.
  • a magnetically controllable semiconductor device 7 which, during operation, has a current flowing through it.
  • the electrical resistance of the device 7 can be varied by varying the strength of the magnetic field in which it is disposed.
  • Such devices are commercially obtainable, for example, under the name of field plates.
  • the device 7 is secured between the soft iron plates 9 and 9'.
  • the displacement path of the slide 2 is limited, so that, in one limit position, that is the inoperative position which is shown in FIG. 1, the slide 2 is urged upwardly (as viewed in FIG. 1) by the force of the spring 3.
  • the slide 2 By pressing a knob 10 fixed on the slide 2, the slide 2 can be moved into the other limit position.
  • the device 7 is so mounted relative to the magnet 6 that in the first-mentioned position of the slide 2 a far larger proportion of the magnetic flux between the poles of the magnet 6 flows through the device 7 than in the other position of the slide 2.
  • FIG. 1 position substantially all the magnetic flux of the magnet 6 passes through the device 7, the plates 9 and 9 acting as pole pieces and concentrating the flux through the device 7.
  • the magnet 6 When the knob 10 is depressed, the magnet 6 will be disposed such that the plate 9' extends across both poles of the magnet 6, so that substantially all the magnetic flux passes through the plate 9', and so does not pass through the device 7.
  • the ohmic resistance of the device 7 is thus changed, and this can be caused to generate a switching pulse.
  • the device 7 is coupled via connecting leads (not shown) to the control circuit of a logic element mounted on a support 1 1.
  • the device 7 it is preferable for the device 7 to be in series with an ohmic resistor in a voltage divider circuit, and for the connecting point to be coupled to the control electrode of a transistor.
  • the parameters are selected such that a change in the ohmic resistance of the device 7 will so change the potential of the control electrode of the transistor that the transistor passes from the blocked to the conductive state or vice versa.
  • a material which has proved particularly successful for the magnet 6 is ALNICO 450.
  • FIG. 3 is a side view on a larger scale of the plates 9 and 9'.
  • the top and bottom end faces of which (as viewed in FIG. 3) have, in one embodiment, the dimensions 1.7 X 3.7 mm.
  • the active surface on the top of the device 7 has the dimensions 0.7 X 1.7 mm.
  • the end of the plate 9 abutting the device 7 is tapered to one third of the area of the non-tapered cross section of the plates 9.
  • the thicknesses of the plates 9 and 9 are 0.8 and 1.5 mm respectively, while both plates 9 and 9' have a width of 45 mm (in the non-tapered portion).
  • An angle of 45 has been found useful for the wedge-like tapering of the plate 9.
  • displacement of the knob 10 and of the magnet 6 coupled thereto causes the ohmic resistance of the device 7 to be changed in the ratio 1:5.
  • This change in resistance obtained with simple means, is not merely adequate for virtually all fields of application, but also ensures security of operation.
  • a magnetic key comprising a casing, a slide mounted in the casing for linear movement between two positions, spring. means urging the slide towards oneof said positions, a .permanent magnetcarried by the slide and having aNorth'pole and a South pole aligned'in the direction 'of'saidmovement of the slide, two pole pieces mountedwithin the casing, a magnetically'controllable semiconductor device mounted between the pole pieces, the arrangement being'suchthat in one of said positions of the'slide said two poles of the magnet are adjacent to the two pole pieces respectively whereby a substantial partof the magnetic fluxof the magnet passes through said device, and in the other of said positions of the slide said-two poles of v the magnet are both adjacent to one of the'twopole pieces.
  • a key accordingto claim Z wherein the casing has on the inside two grooves disposed parallel to 'said direction, and the slide is provided with two rib-like projections slidable in respective grooves.
  • a key accordingto claim 1 wherein the two pole pieces are plate-shaped and made of magnetically soft iron.
  • one polepiece as measured in said direction, is substantially longer than the other pole piece, and. said one pole piece is arranged in the casing such that in said other of said positions of the slide said twopoles of the. magnet are both adjacent to said one pole piece.

Landscapes

  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Adjustable Resistors (AREA)
  • Push-Button Switches (AREA)
US83753A 1970-07-01 1970-10-26 Magnetic keys Expired - Lifetime US3668596A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19707024643U DE7024643U (de) 1970-07-01 1970-07-01 Einbautaster fuer elektronische geraete

Publications (1)

Publication Number Publication Date
US3668596A true US3668596A (en) 1972-06-06

Family

ID=6612695

Family Applications (1)

Application Number Title Priority Date Filing Date
US83753A Expired - Lifetime US3668596A (en) 1970-07-01 1970-10-26 Magnetic keys

Country Status (4)

Country Link
US (1) US3668596A (https=)
DE (1) DE7024643U (https=)
FR (1) FR2066166A5 (https=)
GB (1) GB1274398A (https=)

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750077A (en) * 1971-09-23 1973-07-31 Denki Onkyo Co Ltd Contactless switching apparatus
US3848216A (en) * 1973-10-09 1974-11-12 J Gamble Solid state keyboard switch
US3873957A (en) * 1972-10-20 1975-03-25 Philips Corp Push button
JPS5030276U (https=) * 1973-07-12 1975-04-04
JPS5048968U (https=) * 1973-08-31 1975-05-14
JPS50148879A (https=) * 1974-05-20 1975-11-28
JPS50150763U (https=) * 1974-05-31 1975-12-15
US4107604A (en) * 1976-12-01 1978-08-15 Compunetics, Incorporated Hall effect displacement transducer using a bar magnet parallel to the plane of the Hall device
US4156820A (en) * 1976-05-15 1979-05-29 Matsu Kyu Kabushiki Kaisha Miniature contactless switching unit
US4203093A (en) * 1978-09-19 1980-05-13 Texas Instruments Incorporated Solid state keyswitch arrangement
EP0049457A3 (en) * 1980-10-06 1982-12-01 Honeywell Inc. Alarm pull station
US6577119B1 (en) * 1999-12-01 2003-06-10 Sena Yaddehige Pedal position sensor with magnet movable relative to a magnetic field sensor located in a stator channel
EP1055912A3 (en) * 1999-05-28 2004-05-19 Caithness Development Ltd. A sensor
US20070290642A1 (en) * 2006-06-06 2007-12-20 Matsushita Electric Industrial Co., Ltd. Vehicle switch
US20110291777A1 (en) * 2010-05-29 2011-12-01 Winfried Stiltz Magnetically operated switch
US20170217157A1 (en) * 2014-07-10 2017-08-03 Velcro BVBA Printing plate connection systems
CN107408944A (zh) * 2015-03-12 2017-11-28 樱桃有限公司 键盘键的键模块、制造键盘键的键模块的方法及确定键盘键的致动状态的方法

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2256360A1 (de) * 1972-11-17 1974-05-22 Finsterhoelzl Rafi Elekt Kontaktloser taster und schalter
RU2400930C1 (ru) * 2009-05-12 2010-09-27 Государственное образовательное учреждение высшего профессионального образования "Самарский государственный университет путей сообщения" (СамГУПС) Ключевой элемент

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3571774A (en) * 1966-09-24 1971-03-23 Raimund Finsterholzl Elektrote Non-contacting electronic switch gear
US3590134A (en) * 1968-03-29 1971-06-29 Nippon Musical Instruments Mfg Electronic musical system with magnetic field responsive switch and volume control

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3571774A (en) * 1966-09-24 1971-03-23 Raimund Finsterholzl Elektrote Non-contacting electronic switch gear
US3590134A (en) * 1968-03-29 1971-06-29 Nippon Musical Instruments Mfg Electronic musical system with magnetic field responsive switch and volume control

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3750077A (en) * 1971-09-23 1973-07-31 Denki Onkyo Co Ltd Contactless switching apparatus
US3873957A (en) * 1972-10-20 1975-03-25 Philips Corp Push button
JPS5030276U (https=) * 1973-07-12 1975-04-04
JPS5048968U (https=) * 1973-08-31 1975-05-14
US3848216A (en) * 1973-10-09 1974-11-12 J Gamble Solid state keyboard switch
JPS50148879A (https=) * 1974-05-20 1975-11-28
JPS50150763U (https=) * 1974-05-31 1975-12-15
US4156820A (en) * 1976-05-15 1979-05-29 Matsu Kyu Kabushiki Kaisha Miniature contactless switching unit
US4107604A (en) * 1976-12-01 1978-08-15 Compunetics, Incorporated Hall effect displacement transducer using a bar magnet parallel to the plane of the Hall device
US4203093A (en) * 1978-09-19 1980-05-13 Texas Instruments Incorporated Solid state keyswitch arrangement
EP0049457A3 (en) * 1980-10-06 1982-12-01 Honeywell Inc. Alarm pull station
EP1055912A3 (en) * 1999-05-28 2004-05-19 Caithness Development Ltd. A sensor
US6577119B1 (en) * 1999-12-01 2003-06-10 Sena Yaddehige Pedal position sensor with magnet movable relative to a magnetic field sensor located in a stator channel
US20070290642A1 (en) * 2006-06-06 2007-12-20 Matsushita Electric Industrial Co., Ltd. Vehicle switch
US7893800B2 (en) * 2006-06-06 2011-02-22 Panasonic Corporation Vehicle switch
US20110291777A1 (en) * 2010-05-29 2011-12-01 Winfried Stiltz Magnetically operated switch
US20170217157A1 (en) * 2014-07-10 2017-08-03 Velcro BVBA Printing plate connection systems
CN107408944A (zh) * 2015-03-12 2017-11-28 樱桃有限公司 键盘键的键模块、制造键盘键的键模块的方法及确定键盘键的致动状态的方法

Also Published As

Publication number Publication date
DE7024643U (de) 1971-01-28
FR2066166A5 (https=) 1971-08-06
GB1274398A (en) 1972-05-17

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