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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Prior art keywords
slide
magnet
key according
positions
pole
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Expired - Lifetime
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US83753A
Inventor
Rudolf Hubrich
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Rafi Raimund Finsterholzl Elektrotechnische Spezialfabrik
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Finsterhoelzl Rafi Elekt
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    • 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.

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  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
  • Adjustable Resistors (AREA)
  • Push-Button Switches (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)

Abstract

A magnetic key suitable for use with electronic equipment comprises a magnetically controllable semiconductor device mounted between two soft iron pole pieces, and a permanent magnet movable relative to the device. The magnet is carried by a slide movable between two positions and biased by a spring towards one of the positions. In one position only a substantial part of the magnetic flux of the magnet passes through the device, so the condition of the device can be controlled by movement of the slide.

Description

United States, Paten 1151 3,668,596 Hubrlc i 1451 June 6, 1972 [5 1 MAGNETIC KEYS [56] References Cited UNITED STATES PATENTS [72] Inventor: Rudolf l-lubrich, Ravensburg, Germany 3,571,774 3/1971 l-lubrich ..338/32 R 1 Asslsnw kalmufld Fmslerholll Elektrotech- 3,590,134 6 1971 Ogi ..338/32 R x n1sche spezlalfabrik, Ravensburg/Wun- I tgmberg Germany I Primary Examiner-C. L. Albritton Filed: o. 1970 Attorney-Emest S. Montague [2l] Appl. No.: 83,753 [57] 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. ..338/32 R 323/94 11 324 46 swing a 51 1111.01 .3 .1166 7/16 stamial magneic flux magnet Passes mush 581 Field of Search ..338/32 R, 32 11; 323/54 1-1- device can be by 324/45, 46; 335 1; 307 309; 317 235 H mwemen Slide- 10 Claims, 3 Drawing y BACKGROUND OF THE INVENTION Numerous different embodiments of magnetic keys, particularly, but not exclusively, designed to be fitted in electronic equipment, are already known. The invention relates specifically to such keys in which a change in the position of a magnet relative to a magnetically controllable semiconductor device produces a change in the electrical resistance of the semiconductor device. So-called field plates have already been used for this purpose; with these, the electrical resistance is known to depend on the strength of the magnetic field permeating them. 7
SUMMARY OF THE INVENTION 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.
According to the present invention there is provided 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 result is that in one of said positions of the slide the magnetically controllable semiconductor device is permeated 4 by a many times stronger magnetic field'than in the other of said positions. The electrical resistance of the device is consequentlydependent on the position of the slide, and this physical effect can be used in known manner to generate electric switching pulses. 5
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.
It is advantage for the two pole pieces to be plate-shaped and made of magnetically soft iron.
In a preferred embodiment of the invention 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.
In order to make maximum use of the flux emanating from the permanent magnet, it has been found desirableto taper the cross section of one pole piece in the direction of said device preferably to less than half.
Naturally, it will be appreciated that many variations may I be effected without departing from the spirit and scope of the present inventive concept.
BRIEF DESCRIPTION OF THE DRAWING 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.
'2 DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, 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. As can be seen clearly from FIG. 2, 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. Within the case 1, in the region of the magnetic field of the permanent magnet 6, is mounted 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'.
By providing appropriate stops or by suitably shaping the case 1 and/or the slide 2, 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. 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.
In 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. 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. When the knob 10 is depressed, the ohmic resistance of the device 7 is thus changed, and this can be caused to generate a switching pulse. For this purpose, the device 7 is coupled via connecting leads (not shown) to the control circuit of a logic element mounted on a support 1 1.
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'. Between the two plates 9 and 9' is the device 7, 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. In order that the magnetic flux of the magnet 6 can be utilized as effectively as possible, that is supplied via the plates 9 and 9 to the active surface of the device 7, 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. In the example illustrated, 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.
In the embodiment illustrated, 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.
Many possible modifications will become apparent from the foregoing without departing from the spirit of the present invention. However, the foregoing disclosure is presented in an illustrative sense rather than a limiting'sende and the appended claims are relied upon to definethe scope of the present-invention.
What is claimed as new and desired to beprotected by Letters Patent is set-forth in the appended claims.
What isclaimed is:
I 1. 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.
2.-A key according to claiml wherein the casing is made'of plastics material.
3. A key accordingto claim Zwherein 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.
4. A key according to claim 3 whereinthe slide is made of plastics material.
5. A. key according to claim 1 wherein the magnet is generally U-shaped.
6. A key accordingto claim 1 wherein the two pole pieces are plate-shaped and made of magnetically soft iron.
7. A key according to claim 6 wherein 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.
8: A key according to claim 7 wherein the end faces of the two pole pieces, which face towards one another, are parallel with one another and substantially perpendicular to said direction, said device in plate-shaped, and the two large surfaces of said device extend perpendicular to said direction.
9. A key according to'claim.8 wherein the cross section of one pole piece is taperedin the direction of saiddevice.
10. A key according toclaim 9: wherein the end face of the taperedpole piece has at most one third of thecross-sectional area of the non-tapered part of said pole piece.

Claims (10)

1. 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, a permanent magnet carried by the slide and having a North pole and a South pole aligned 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.
2. A key according to claim 1 wherein the casing is made of plastics material.
3. A key according to claim 2 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.
4. A key according to claim 3 wherein the slide is made of plastics material.
5. A key according to claim 1 wherein the magnet is generally U-shaped.
6. A key according to claim 1 wherein the two pole pieces are plate-shaped and made of magnetically soft iron.
7. A key according to claim 6 wherein one pole piece, 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 two poles of the magnet are both adjacent to said one pole piece.
8. A key according to claim 7 wherein the end faces of the two pole pieces, which face towards one another, are parallel with one another and substantially perpendicular to said direction, said device in plate-shaped, and the two large surfaces of said device extend perpendicular to said direction.
9. A key according to claim 8 wherein the cross section of one pole piece is tapered in the direction of said device.
10. A key according to claim 9 wherein the end face of the tapered pole piece has at most one third of the cross-sectional area of the non-tapered part of said pole piece.
US83753A 1970-07-01 1970-10-26 Magnetic keys Expired - Lifetime US3668596A (en)

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DE19707024643U DE7024643U (en) 1970-07-01 1970-07-01 BUILT-IN BUTTONS FOR ELECTRONIC DEVICES

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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 (en) * 1973-07-12 1975-04-04
JPS5048968U (en) * 1973-08-31 1975-05-14
JPS50148879A (en) * 1974-05-20 1975-11-28
JPS50150763U (en) * 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 (en) * 2015-03-12 2017-11-28 樱桃有限公司 The method of the actuating state of the key module of keyboard key, the method for the key module of manufacture keyboard key and determination keyboard key

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2256360A1 (en) * 1972-11-17 1974-05-22 Finsterhoelzl Rafi Elekt CONTACTLESS BUTTON AND SWITCH
RU2400930C1 (en) * 2009-05-12 2010-09-27 Государственное образовательное учреждение высшего профессионального образования "Самарский государственный университет путей сообщения" (СамГУПС) Key element

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 (en) * 1973-07-12 1975-04-04
JPS5048968U (en) * 1973-08-31 1975-05-14
US3848216A (en) * 1973-10-09 1974-11-12 J Gamble Solid state keyboard switch
JPS50148879A (en) * 1974-05-20 1975-11-28
JPS50150763U (en) * 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 (en) * 2015-03-12 2017-11-28 樱桃有限公司 The method of the actuating state of the key module of keyboard key, the method for the key module of manufacture keyboard key and determination keyboard key

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FR2066166A5 (en) 1971-08-06
GB1274398A (en) 1972-05-17
DE7024643U (en) 1971-01-28

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