EP0451676A2 - Clavier pour un appareil électronique de divertissement - Google Patents

Clavier pour un appareil électronique de divertissement Download PDF

Info

Publication number
EP0451676A2
EP0451676A2 EP91105225A EP91105225A EP0451676A2 EP 0451676 A2 EP0451676 A2 EP 0451676A2 EP 91105225 A EP91105225 A EP 91105225A EP 91105225 A EP91105225 A EP 91105225A EP 0451676 A2 EP0451676 A2 EP 0451676A2
Authority
EP
European Patent Office
Prior art keywords
contact
input keyboard
key
contact pads
plastic film
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.)
Withdrawn
Application number
EP91105225A
Other languages
German (de)
English (en)
Other versions
EP0451676A3 (en
Inventor
Richard Kramer
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.)
Nokia Deutschland GmbH
Original Assignee
Nokia Unterhaltungselektronik Deutschland GmbH
Nokia Deutschland GmbH
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 Nokia Unterhaltungselektronik Deutschland GmbH, Nokia Deutschland GmbH filed Critical Nokia Unterhaltungselektronik Deutschland GmbH
Publication of EP0451676A2 publication Critical patent/EP0451676A2/fr
Publication of EP0451676A3 publication Critical patent/EP0451676A3/de
Withdrawn legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H13/00—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch
    • H01H13/70—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard
    • H01H13/702—Switches having rectilinearly-movable operating part or parts adapted for pushing or pulling in one direction only, e.g. push-button switch having a plurality of operating members associated with different sets of contacts, e.g. keyboard with contacts carried by or formed from layers in a multilayer structure, e.g. membrane switches
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2215/00—Tactile feedback
    • H01H2215/004—Collapsible dome or bubble
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H2239/00—Miscellaneous
    • H01H2239/078—Variable resistance by variable contact area or point

Definitions

  • the invention relates to an input keyboard according to the preamble of claim 1 for an electrical device for consumer electronics.
  • Consumer electronics devices increasingly contain input keyboards both for local operation on the device itself and for remote control in a remote control transmitter, which are based on a printed circuit board with printed switch contacts. This design of an input keyboard facilitates the production of such an input keyboard and lowers the manufacturing costs.
  • Such an input keyboard for a remote control transmitter is known for example from the German magazine rme, 1980, number 11, pages 311 to 315.
  • This known remote control transmitter contains on a printed circuit board in copper-carbon technology contacts for several pushbuttons of the remote control transmitter and a contact rubber mat placed between the circuit board and the buttons guided in the cover plate of the remote control transmitter. At the location of the buttons on the remote control transmitter, rubber domes are formed in the contact mat as spring elements, which produce a cracking effect when the button is pressed and which contain a carbon contact vulcanized on the side facing the contacts of the printed circuit board.
  • the invention is therefore based on the object of providing key switch devices in an input keyboard according to the preamble of claim 1, via which not only a switching process but also an adjustment process is generated and which do not significantly complicate the manufacturing process of such an input keyboard.
  • An input keyboard designed according to the invention can be configured essentially in the same way as a conventional input keyboard containing only switching functions.
  • the additionally required carbonized plastic film with the additional conductor layer requires only a few 10 micrometers of additional height, which, even with a total height of only a few millimeters, of such an input keyboard is of no importance.
  • a switching element is known from EP patent application 0050231 A2 which essentially contains two layers of elastomeric substance interspersed with electrically conductive particles, the volume resistance of which has a pressure-dependent resistance value.
  • Such an arrangement requires an extension in height that is much too great for input keyboards.
  • the substances are not sufficiently resistant to aging, neither against the environmental influences, nor against the number of pressure changes, as studies have shown.
  • the carbonized plastic film used in the input keyboard according to the invention has many times better results in this regard.
  • a spring element between the key base of a key and its counter contact, which distributes the key pressure of the actuated key evenly over the surface of the carbonized plastic film acting as a counter contact.
  • this spring element also acts as a displacement pressure transducer, which gives the user of the input keyboard the feeling of having a certain, albeit small Keystroke to record the setting speed or setting height controlled with the key in a psychologically familiar manner.
  • the formation of the conductive layers as a graphite layer has an advantageous effect in that graphite layers of this type are not very sensitive to environmental influences and change the transition properties of the touch contact arrangement at most insignificantly over a long period of time and over many operations.
  • a particularly advantageous embodiment of the support of the carbonized plastic film in relation to the contact surfaces to be bridged is the edge of a section of a thin insulating plate arranged between the printed circuit board and the plastic film, the cutouts of which are provided in the thin insulating plate in the area of the contact surfaces to be bridged.
  • Such an insulating plate also does not require any additional expansion of the input keyboard between the printed circuit board and the keyboard cover plate because of its small thickness and also only a small stroke of the carbonized plastic film.
  • FIG. 1 The area of a key 22 of an input keyboard 1 is shown in detail in FIG. 1, which is guided in a hole 26 of a keyboard cover plate 23 and which is provided for the pressure-sensitive connection of two contact pads 11.1 and 11.2 of a switch arrangement 3.
  • a plate-shaped spring element 20 made of a pressure-elastic plastic is attached.
  • the underside 19 of the spring element 20 is first covered with an electrically conductive layer 17 of high conductivity and finally with a carbonized plastic film 14.
  • the carbonized plastic film 14 and the electrically conductive layer 17 thereon together form the counter-contact 16 of the switch arrangement 3 actuated by the button 22.
  • the contacts of the switch arrangement 3 to be connected by the counter-contact 16 are to be corresponding as contact pads 11.1 and 11.2 in the area of the contact pads Widened conductor tracks 12.1 and 12.2 of a printed circuit board 10 of the input keyboard are applied and, in the exemplary embodiment shown, consist of a graphite coating.
  • a thin insulating plate 13 is arranged on the conductor tracks as a spacer between the counter contact 16 of the key 22 and the contact pads 11.1 and 11.2 of the electrical conductors 12.1 and 12.2 of the printed circuit board 10. In the area of the contact surfaces 11.1 and 11.2, the thin insulating plate 13 contains a recess 25, on the edge 26 of which the mating contact 16 of the switch arrangement 3 essentially rests.
  • the mode of operation of the bridging resistance formed between the contact resistors Rk (P) between the contact surfaces 15 and 18 and the resistance Rd of the mating contact 16 between the conductors 12.1 and 12.2 to be connected is explained in more detail with reference to the circuit diagram shown in FIG.
  • the thickness d of the carbonized plastic film 14 of the mating contact 16 is dimensioned such that the electrical resistance Rd of the carbonized plastic film between the two surfaces is relatively small compared to the overall bridging resistance and to a current electrical longitudinal resistance Ra of the film, despite the low electrical conductivity of the film. Therefore, the film thickness d is significantly smaller than the distance a between the two contact pads 11.1 and 11.2 to be connected. In the exemplary embodiment shown, the film thickness is approximately 20 micrometers.
  • the power line in the carbonized plastic film 14 is oriented essentially perpendicular to the film, as is illustrated schematically in FIG. 2 by the resistances Rd inside the bar 14 representing the carbonized plastic film.
  • the longitudinal resistance Ra shown therein which represents the longitudinal resistance of the film between the two contact paths 11.1 and 11.2 bridged by the counter-contact 16, is considerably greater than the volume resistances Rd through the carbonized plastic film, so that current flow in the film parallel to its surfaces is not weight.
  • Such current conduction only takes place outside the carbonized plastic film, namely in the electrically conductive layer 17, as is schematically illustrated by the electrical line 21 within this layer.
  • the pressure-dependent contact resistance between the contact surface 18 of the carbonized plastic film and the contact surfaces 15.1 and 15.2 of the contact pads 11.1 and 11.2 of the conductor tracks 12.1 and 12.2 of the printed circuit board 10 is shown schematically in FIG. 2 by the resistances Rk (P) which can be controlled by a pressure P. These resistances decrease approximately linearly with increasing contact pressure over a range of two to three powers of ten.
  • This contact pressure is formed from the actuation pressure P on the button 22, which is transmitted via the spring element 20 to the contact surface 18 of the carbonized plastic film 14.
  • the electrical conductor 12.1 of the printed circuit board 10 is a reference potential conductor, as is shown schematically in FIG. 1 by the reference potential line 4.
  • the other contact pad 11.2 is one via the conductor track 12.2 with the control input 5 Control circuitry 6 connected.
  • the control circuit arrangement 6 When the button 22 is pressed, the control circuit arrangement 6 generates a function command Bf for setting a specific function of an electrical device, which is operated from the input keyboard, and a command dependent on the value of the bridging resistance of the pressed button 22, on account of the bridging resistance applied to its control input 5 Bw for setting a certain value associated with the triggered function or the value of a setting speed.
  • the thickness and resilience of the spring body 20 is dimensioned such that not only approximately the same contact pressure over the entire contact surface 18 of the mating contact 16 on the contact pads 11.1 and 11.2 of the switch arrangement 3 is achieved, but that Spring element 20 also serves as a sensitive pressure-transducer for the user of the input keyboard and provides the user with an emotional increase in pressure through an increasing actuation path.
  • the top surface of a rubber dome of a contact mat to which the spring element 20 is attached is arranged between the key base 27 of a key 22 and its associated spring element 20.
  • the rubber dome is supported instead of the thin insulating plate on the printed circuit board 10 and, when the associated key 22 is pressed, first causes a switching operation with a cracking effect and then allows a function variable to be set as a function of pressure. In this way it is possible with a switch mat to combine switch arrangements with and without an additional pressure-dependent setting function.
  • the carbonized plastic film extends in one piece over the entire key area of the input keyboard.
  • either the underside of the spring element of the individual buttons or the side of the carbonized plastic film facing the buttons 22 is coated with an electrically conductive layer of high conductivity in the area of the switch arrangement.

Landscapes

  • Push-Button Switches (AREA)
EP19910105225 1990-04-11 1991-03-30 Input keyboard for a consumer electronic device Withdrawn EP0451676A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4011636A DE4011636A1 (de) 1990-04-11 1990-04-11 Drucksensitiver tastschalter
DE4011636 1990-04-11

Publications (2)

Publication Number Publication Date
EP0451676A2 true EP0451676A2 (fr) 1991-10-16
EP0451676A3 EP0451676A3 (en) 1991-12-11

Family

ID=6404163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910105225 Withdrawn EP0451676A3 (en) 1990-04-11 1991-03-30 Input keyboard for a consumer electronic device

Country Status (4)

Country Link
US (1) US5164697A (fr)
EP (1) EP0451676A3 (fr)
JP (1) JPH04230918A (fr)
DE (1) DE4011636A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692803A1 (fr) 1994-07-13 1996-01-17 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co. KG. Dispositif pour la transmission à un capteur de force, de la force appliquée à une touche
WO2001041171A1 (fr) * 1997-10-01 2001-06-07 Armstrong Brad A Capteur a conductance variable avec bouton-poussoir elastomere

Families Citing this family (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6344791B1 (en) 1998-07-24 2002-02-05 Brad A. Armstrong Variable sensor with tactile feedback
US6222525B1 (en) 1992-03-05 2001-04-24 Brad A. Armstrong Image controllers with sheet connected sensors
US6906700B1 (en) 1992-03-05 2005-06-14 Anascape 3D controller with vibration
US6347997B1 (en) 1997-10-01 2002-02-19 Brad A. Armstrong Analog controls housed with electronic displays
US6208271B1 (en) 1998-09-04 2001-03-27 Brad A. Armstrong Remote controller with analog button(s)
US5999084A (en) * 1998-06-29 1999-12-07 Armstrong; Brad A. Variable-conductance sensor
US5625333A (en) * 1995-09-22 1997-04-29 Morton International, Inc. Bend sensor horn switch assembly
US8674932B2 (en) 1996-07-05 2014-03-18 Anascape, Ltd. Image controller
US6351205B1 (en) * 1996-07-05 2002-02-26 Brad A. Armstrong Variable-conductance sensor
US6532000B2 (en) 1997-10-01 2003-03-11 Brad A. Armstrong Analog controls housed with electronic displays for global positioning systems
US6456778B2 (en) 1997-10-01 2002-09-24 Brad A. Armstrong Analog controls housed with electronic displays for video recorders and cameras
US6415707B1 (en) 1997-10-01 2002-07-09 Brad A. Armstrong Analog controls housed with electronic displays for coffee makers
US6404584B2 (en) 1997-10-01 2002-06-11 Brad A. Armstrong Analog controls housed with electronic displays for voice recorders
US6404323B1 (en) 1999-05-25 2002-06-11 Varatouch Technology Incorporated Variable resistance devices and methods
US7190251B2 (en) * 1999-05-25 2007-03-13 Varatouch Technology Incorporated Variable resistance devices and methods
AU764647B2 (en) * 1999-09-10 2003-08-28 Sony Interactive Entertainment Inc. Remote control device with pressure-sensitive keys
US6717568B1 (en) 1999-09-10 2004-04-06 Sony Computer Entertainment Inc. Method of controlling the movement of a position indicating item, storage medium on which a program implementing said method is stored, and electronic device
JP2001318758A (ja) 2000-03-03 2001-11-16 Sony Computer Entertainment Inc 操作装置および同装置の信号出力調整方法
US7474772B2 (en) 2003-06-25 2009-01-06 Atrua Technologies, Inc. System and method for a miniature user input device
US7587072B2 (en) 2003-08-22 2009-09-08 Authentec, Inc. System for and method of generating rotational inputs
JP4190426B2 (ja) * 2004-01-08 2008-12-03 ローランド株式会社 電子打楽器
US7440290B2 (en) * 2004-05-17 2008-10-21 Qualcomm Incorporated Control systems
TWI380211B (en) * 2006-02-10 2012-12-21 Forest Assets Ii Ltd Liability Company A system generating an input useful to an electronic device and a method of fabricating a system having multiple variable resistors
US9235274B1 (en) 2006-07-25 2016-01-12 Apple Inc. Low-profile or ultra-thin navigation pointing or haptic feedback device
DE102007011364B4 (de) * 2007-03-07 2008-11-27 Carl Freudenberg Kg Sensoranordnung mit elastischer Hinterfütterung
TWI485305B (zh) * 2009-09-30 2015-05-21 Hon Hai Prec Ind Co Ltd 沖水系統
US8791792B2 (en) 2010-01-15 2014-07-29 Idex Asa Electronic imager using an impedance sensor grid array mounted on or about a switch and method of making
US8866347B2 (en) 2010-01-15 2014-10-21 Idex Asa Biometric image sensing
US8421890B2 (en) 2010-01-15 2013-04-16 Picofield Technologies, Inc. Electronic imager using an impedance sensor grid array and method of making
US20130279769A1 (en) 2012-04-10 2013-10-24 Picofield Technologies Inc. Biometric Sensing
CN105551864A (zh) * 2015-12-28 2016-05-04 合肥联宝信息技术有限公司 一种键盘和电子设备
EP3747037B1 (fr) 2018-02-01 2023-11-22 Razer (Asia-Pacific) Pte. Ltd. Mécanismes des boutons-poussoir, dispositifs d'entrée d'utilisateur et procédés de fabrication d'un mécanisme d'un bouton-poussoir

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4296406A (en) * 1979-12-28 1981-10-20 Sperry Corporation Pressure sensitive switch structure
EP0050231A2 (fr) * 1980-10-17 1982-04-28 Bosch-Siemens HausgerÀ¤te GmbH Dispositif de commutation à résistance variable
DE3543890A1 (de) * 1985-12-12 1987-06-19 Thomson Brandt Gmbh Eingabeelement

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DE2343980A1 (de) * 1973-08-31 1975-04-17 Bayer Ag Verfahren zur herstellung von kohlenstoffen, vorzugsweise kohlenstoff-schaumstoffen
DE2343979A1 (de) * 1973-08-31 1975-04-17 Bayer Ag Verfahren zur herstellung von kohlenstoffen, vorzugsweise kohlenstoff-schaumstoffen
DE3123438C2 (de) * 1981-06-12 1985-02-07 Wilhelm Ruf KG, 8000 München Schaltanordnung
DE3241159C2 (de) * 1982-11-08 1986-10-02 Fa. Georg Schlegel, 7941 Duermentingen Befehlstaster zum Einbau in eine Schalttafel oder dergleichen
GB8303679D0 (en) * 1983-02-10 1983-03-16 Gould Instr Ltd Variable control device
JPS60136022U (ja) * 1984-02-20 1985-09-10 アルプス電気株式会社 押釦スイツチ
US4847586A (en) * 1987-11-23 1989-07-11 Kokoku Rubber Industry Company Limited Pressure detector

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4296406A (en) * 1979-12-28 1981-10-20 Sperry Corporation Pressure sensitive switch structure
EP0050231A2 (fr) * 1980-10-17 1982-04-28 Bosch-Siemens HausgerÀ¤te GmbH Dispositif de commutation à résistance variable
DE3543890A1 (de) * 1985-12-12 1987-06-19 Thomson Brandt Gmbh Eingabeelement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Radio Mentor Elektronik no. 11, 1980, Seiten 311 - 315; "Von der Klickfeder zur Kontaktgummimatte" *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0692803A1 (fr) 1994-07-13 1996-01-17 GRUNDIG E.M.V. Elektro-Mechanische Versuchsanstalt Max Grundig & Co. KG. Dispositif pour la transmission à un capteur de force, de la force appliquée à une touche
DE4424618A1 (de) * 1994-07-13 1996-01-18 Grundig Emv Vorrichtung zur Übertragung von einer auf eine Taste ausgeübten Kraft auf einen Kraftsensor
WO2001041171A1 (fr) * 1997-10-01 2001-06-07 Armstrong Brad A Capteur a conductance variable avec bouton-poussoir elastomere

Also Published As

Publication number Publication date
DE4011636A1 (de) 1991-10-24
EP0451676A3 (en) 1991-12-11
JPH04230918A (ja) 1992-08-19
US5164697A (en) 1992-11-17

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