WO2008087630A2 - A method for the fully automated production of a piezoelectric switch and a process therefor - Google Patents

A method for the fully automated production of a piezoelectric switch and a process therefor Download PDF

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Publication number
WO2008087630A2
WO2008087630A2 PCT/IL2008/000057 IL2008000057W WO2008087630A2 WO 2008087630 A2 WO2008087630 A2 WO 2008087630A2 IL 2008000057 W IL2008000057 W IL 2008000057W WO 2008087630 A2 WO2008087630 A2 WO 2008087630A2
Authority
WO
WIPO (PCT)
Prior art keywords
piezoelectric
pcb
piezoelectric ceramic
switch
metal sheet
Prior art date
Application number
PCT/IL2008/000057
Other languages
French (fr)
Other versions
WO2008087630A3 (en
Inventor
Armand Rosenberg
Original Assignee
Baran Advanced Technologies (86) 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 Baran Advanced Technologies (86) Ltd. filed Critical Baran Advanced Technologies (86) Ltd.
Priority to EP08702638A priority Critical patent/EP2104588B1/en
Publication of WO2008087630A2 publication Critical patent/WO2008087630A2/en
Publication of WO2008087630A3 publication Critical patent/WO2008087630A3/en

Links

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
    • H03K17/96—Touch switches
    • H03K17/964—Piezoelectric touch switches
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K2217/00—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00
    • H03K2217/94—Indexing scheme related to electronic switching or gating, i.e. not by contact-making or -breaking covered by H03K17/00 characterised by the way in which the control signal is generated
    • H03K2217/96—Touch switches
    • H03K2217/96015—Constructional details for touch switches

Definitions

  • the present invention relates to the field of producing piezoelectric switches. More particularly, the invention relates to a method for assembling piezoelectric switches which is fully automated, simple and cost effective.
  • the piezoelectric switches may be constructed with no moving parts, a feature that enhances the life span of the switch in many ways. Firstly, the switch components are less likely to wear off from friction of movement. Secondly, the switches may be hermetically sealed against environmental changes, vandalism, and cleaning liquids. When pressure is applied to the outer deformable surface of the piezoelectric switch, the pressure is transferred to the piezoelectric material, which in turn produces a potential for activating the switching circuit. Upon activation, the switching circuit produces an electric connection between its two ports, effectively closing the outer electric circuit where the switch is connected. Nevertheless, since the piezoelectric switches must be pressure sensitive, their construction usually requires a tight assembly of their inner components.
  • some of the prior art piezoelectric switches comprise a rigid outer cup-shaped casing where all the inner components are inserted inside, with great precision, and tightly fastened, a complex process which in effect raises manufacturing costs.
  • the piezoelectric switches are injected with a relatively rigid insulating substance for transferring the pressure from the deformable surface to the piezoelectric material, a process which also raises manufacturing costs. Therefore, a method is needed for assembling simple piezoelectric switches, where the assembly is fully automated, simple and, cost effective.
  • US patent 4,896,069 discloses a piezoelectric switch which includes a cup- shaped casing, a piezoelectric ceramic for sensing the external mechanical force applied on the casing and converting the force to an electrical signal, a conductive rubber connector disposed adjacent to and in contact with the ceramic for conducting the electrical signal, and a PCB (Printed Circuit Board) disposed adjacent to and in contact with the conductive member for receiving and processing the conducted electrical signal received from the piezoelectric ceramic.
  • the disclosed switch requires a precise assembly and a tight seal which is costly to manufacture.
  • each piezoelectric switch requires a separate assembly and a specially cut individual circuit for inserting in the cup-shaped casing.
  • US patent 5,231,326 discloses a push button piezoelectric switch which does not produce false switching caused by fast temperature rise.
  • the piezoelectric transducer is connected to the switching circuit with a polarity to provide a switching voltage in response to actuation of the push button switch by finger pressure.
  • the connection is such that the polarity of the voltage generated as a result of differential thermal expansion of the piezoelectric transducer is opposite to that produced by finger pressure on the push button switch and does not produce false switching caused by fast temperature rise.
  • the switch is injected with a thermal insulating material between the outer surface and the piezoelectric transducer. Nevertheless, the disclosed switch is difficult and costly to manufacture. It is an object of the present invention to provide a method for a simple assembly of a piezoelectric switch.
  • the present invention relates to a method for fully automated production of a piezoelectric switch comprising the steps of: (a) providing a pliable metal sheet, suitable to flex under pressure; (b) providing and attaching to said metal sheet a piezoelectric ceramic element, which is capable of developing an electric potential under pressure; (c) providing a conductive elastomeric element juxtaposed to said piezoelectric ceramic element; (d) providing a switching circuit, printed in a PCB, having two electrically disconnected ports, said PCB being juxtaposed to said conductive elastomeric element; and (e) bending both sides of said metal sheet to clamp over said PCB to create a sandwich like structure enclosing said piezoelectric ceramic element and said elastomeric element.
  • the piezoelectric ceramic element is positioned off-center of the pliable metal sheet.
  • more than one piezoelectric switch is produced on a PCB slider.
  • the invention further relates to a piezoelectric switch comprising: (a) a switching circuit, printed in a PCB, having two electrically disconnected ports; (b) a piezoelectric ceramic element which is capable of developing an electric potential under pressure; (c) a conductive elastomeric element; and (d) a pliable metal sheet suitable to flex under pressure, having a length sufficient to clamp on opposite sides of said PCB.
  • the piezoelectric ceramic element is positioned off-center of the pliable metal sheet.
  • Fig. Ia is a spread view of the piezoelectric switch and its components according to one of the embodiments of the invention.
  • Fig. Ib is an exploded view of the piezoelectric switch according to one of the embodiments of the invention.
  • Fig. 2 is a perspective view of the assembled piezoelectric switch according to one of the embodiments.
  • - Fig. 3 is a perspective view of an array of assembled piezoelectric switches mounted on a PCB slider according to one of the embodiments.
  • - Fig. 4a is a spread view of a piezoelectric switch and its components according to one of the embodiments.
  • Fig. 4b is an exploded view of the piezoelectric switch according to one of the embodiments.
  • Fig. Ia is a spread view of the piezoelectric switch and its components according to one of the embodiments of the invention.
  • the first component of the piezoelectric switch is a metal foil sheet 10 which is sufficiently flexible to yield under light finger pressure.
  • the second component is a piezoelectric ceramic 20, which is attached to the metal sheet 10, capable of producing an electric potential under light finger pressure, where the light finger pressure is determined as a statistical factor derived from the light finger pressure applied by the general public, or a test group representative of the general population.
  • the third component is a conductive elastomer 30 which is formed as a sandwich, in which a conductive portion 40 is layered between two insulating layers 70.
  • the conductive portion 40 is constructed from strips of conductive material alternating with strips of insulating material, in order to transfer electric potential between upper side and lower side of the conductive elastomer 30.
  • the forth component is the switch circuit printed on PCB 50 which, upon receiving electrical potential, abridges connecting wires 60, effectively causing electrical connectivity between the wires 60.
  • the wires 60 may be external wires attached to PCB 50, as shown, or conducting wires printed on PCB 50 according to one of the embodiments.
  • the wires or any other connecting arrangement is referred to hereinafter as ports.
  • Fig. Ib is an exploded view of the piezoelectric switch according to one of the embodiments of the invention.
  • the automatic assembly of the piezoelectric switch is described in relations to Fig. Ia and begins by providing a metal foil sheet 10.
  • the provided metal foil sheet 10 should have enough width to cover the piezoelectric ceramic 20 and conductive elastomer 30, whereas its length should be long enough to bend around the PCB 50, as shown in Fig. Ib.
  • a piezoelectric ceramic 20 is attached or glued to the metal foil sheet 10 in the area designated to receive the impact of light finger pressure applied to the other side of the metal foil sheet 10.
  • Conductive elastomer 30 is then provided for placing on the piezoelectric ceramic 20, which in turn is responsible for conducting the electric potential of the piezoelectric ceramic 20 to the switching circuit on PCB 50. All three components: metal foil sheet 10, piezoelectric ceramic 20, and conductive elastomer 30, are thus placed on PCB 50 and securely fastened to PCB 50 by bending both sides of metal foil 10 to clamp over the PCB 50, effectively enclosing the piezoelectric ceramic 20 and elastomer 30 inside. Thus when the light finger pressure is applied to metal foil sheet 10 from the outer side, the pressure is transferred to the piezoelectric ceramic 20 which in turn produces an electric potential. The electric potential is then conducted by the conductive elastomer 30 to circuit 50, which in turn abridges the gap between connecting ports 60, effectively interconnecting the switch.
  • Fig. 2 is a perspective view of the assembled piezoelectric switch according to one of the embodiments.
  • the metal foil sheet 10 is bended on both sides in order to cover and protect the inner components of the piezoelectric switch. Inside the protection of the metal foil sheet 10 are the piezoelectric ceramic 20 which is attached under the metal sheet 10, the conductive elastomer 30, and the switch circuit on PCB 50.
  • Fig. 3 is a perspective view of an array of assembled piezoelectric switches mounted on a PCB slider according to one of the embodiments.
  • a number of piezoelectric switches, each having its own metal foil sheet covering 10 are mounted on a single PCB slider 50 in an automated process, as described in relation to Fig. Ib, and the switches connect between conductive ports printed in the PCB 50.
  • the PCB slider may have a single printed circuit having a number of switches each having its own metal foil sheet 10 enclosing the inner parts of the switch.
  • Fig. 4a is a spread view of another piezoelectric switch and its components according to one of the embodiments
  • Fig. 4b is an exploded view of the same piezoelectric switch.
  • the piezoelectric ceramic 20 is positioned off-center of the metal foil sheet 10. Eventually, at the end of the assembly, the piezoelectric ceramic 20 is bound to be closer to one of the foil sheet 10 bended sides. The proximity of the piezoelectric ceramic 20 to one of the bended sides of the foil sheet 10 causes the piezoelectric ceramic 20 to produce an electric potential even when softer pressures than light finger pressures are applied, thus improving the sensitiveness of the switch.
  • the rest of the switch components are similar to the components described before in relations to Fig. Ia and Fig. Ib.

Landscapes

  • Push-Button Switches (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)

Abstract

The present invention relates to a method for fully automated production of a piezoelectric switch comprising the steps of: (a) providing a pliable metal sheet, suitable to flex under pressure; (b) providing and attaching to said metal sheet a piezoelectric ceramic element, which is capable of developing an electric potential under pressure; (c) providing a conductive elastomeric element juxtaposed to said piezoelectric ceramic element; (d) providing a switching circuit, printed in a PCB, having two electrically disconnected ports, said PCB being juxtaposed to said conductive elastomeric element; and (e) bending both sides of said metal sheet to clamp over said PCB to create a sandwich like structure enclosing said piezoelectric ceramic element and said elastomeric element.

Description

AMETHOD FOR THE FULLYAUTOMATED PRODUCTION OFA PIEZOELECTRIC SWITCHANDA
PROCESS THEREFOR
Field of the Invention
The present invention relates to the field of producing piezoelectric switches. More particularly, the invention relates to a method for assembling piezoelectric switches which is fully automated, simple and cost effective.
Background of the invention
In contrary to conventional mechanical switches which depend upon freedom of motion of at least one component, the piezoelectric switches may be constructed with no moving parts, a feature that enhances the life span of the switch in many ways. Firstly, the switch components are less likely to wear off from friction of movement. Secondly, the switches may be hermetically sealed against environmental changes, vandalism, and cleaning liquids. When pressure is applied to the outer deformable surface of the piezoelectric switch, the pressure is transferred to the piezoelectric material, which in turn produces a potential for activating the switching circuit. Upon activation, the switching circuit produces an electric connection between its two ports, effectively closing the outer electric circuit where the switch is connected. Nevertheless, since the piezoelectric switches must be pressure sensitive, their construction usually requires a tight assembly of their inner components. Therefore, some of the prior art piezoelectric switches comprise a rigid outer cup-shaped casing where all the inner components are inserted inside, with great precision, and tightly fastened, a complex process which in effect raises manufacturing costs. In some of the cases the piezoelectric switches are injected with a relatively rigid insulating substance for transferring the pressure from the deformable surface to the piezoelectric material, a process which also raises manufacturing costs. Therefore, a method is needed for assembling simple piezoelectric switches, where the assembly is fully automated, simple and, cost effective.
US patent 4,896,069 discloses a piezoelectric switch which includes a cup- shaped casing, a piezoelectric ceramic for sensing the external mechanical force applied on the casing and converting the force to an electrical signal, a conductive rubber connector disposed adjacent to and in contact with the ceramic for conducting the electrical signal, and a PCB (Printed Circuit Board) disposed adjacent to and in contact with the conductive member for receiving and processing the conducted electrical signal received from the piezoelectric ceramic. Nevertheless, the disclosed switch requires a precise assembly and a tight seal which is costly to manufacture. Furthermore, each piezoelectric switch requires a separate assembly and a specially cut individual circuit for inserting in the cup-shaped casing.
US patent 5,231,326 discloses a push button piezoelectric switch which does not produce false switching caused by fast temperature rise. The piezoelectric transducer is connected to the switching circuit with a polarity to provide a switching voltage in response to actuation of the push button switch by finger pressure. The connection is such that the polarity of the voltage generated as a result of differential thermal expansion of the piezoelectric transducer is opposite to that produced by finger pressure on the push button switch and does not produce false switching caused by fast temperature rise. In addition, the switch is injected with a thermal insulating material between the outer surface and the piezoelectric transducer. Nevertheless, the disclosed switch is difficult and costly to manufacture. It is an object of the present invention to provide a method for a simple assembly of a piezoelectric switch.
It is another object of the present invention to provide a method for fully automated manufacturing of piezoelectric switches.
It is still another object of the present invention to provide a method for manufacturing piezoelectric switches which are cost effective and use a minimal number of parts.
It is still another object of the present invention to provide a method for manufacturing piezoelectric switches which do not require unnecessary insulating materials.
Other objects and advantages of the invention will become apparent as the description proceeds.
Summary of the Invention
The present invention relates to a method for fully automated production of a piezoelectric switch comprising the steps of: (a) providing a pliable metal sheet, suitable to flex under pressure; (b) providing and attaching to said metal sheet a piezoelectric ceramic element, which is capable of developing an electric potential under pressure; (c) providing a conductive elastomeric element juxtaposed to said piezoelectric ceramic element; (d) providing a switching circuit, printed in a PCB, having two electrically disconnected ports, said PCB being juxtaposed to said conductive elastomeric element; and (e) bending both sides of said metal sheet to clamp over said PCB to create a sandwich like structure enclosing said piezoelectric ceramic element and said elastomeric element. Preferably, the piezoelectric ceramic element is positioned off-center of the pliable metal sheet.
Preferably, more than one piezoelectric switch is produced on a PCB slider.
The invention further relates to a piezoelectric switch comprising: (a) a switching circuit, printed in a PCB, having two electrically disconnected ports; (b) a piezoelectric ceramic element which is capable of developing an electric potential under pressure; (c) a conductive elastomeric element; and (d) a pliable metal sheet suitable to flex under pressure, having a length sufficient to clamp on opposite sides of said PCB.
Preferably, the piezoelectric ceramic element is positioned off-center of the pliable metal sheet.
Brief Description of the Drawings
In the drawings:
Fig. Ia is a spread view of the piezoelectric switch and its components according to one of the embodiments of the invention. Fig. Ib is an exploded view of the piezoelectric switch according to one of the embodiments of the invention.
- Fig. 2 is a perspective view of the assembled piezoelectric switch according to one of the embodiments.
- Fig. 3 is a perspective view of an array of assembled piezoelectric switches mounted on a PCB slider according to one of the embodiments. - Fig. 4a is a spread view of a piezoelectric switch and its components according to one of the embodiments.
- Fig. 4b is an exploded view of the piezoelectric switch according to one of the embodiments.
Detailed Description of Preferred Embodiments
Fig. Ia is a spread view of the piezoelectric switch and its components according to one of the embodiments of the invention. The first component of the piezoelectric switch is a metal foil sheet 10 which is sufficiently flexible to yield under light finger pressure. The second component is a piezoelectric ceramic 20, which is attached to the metal sheet 10, capable of producing an electric potential under light finger pressure, where the light finger pressure is determined as a statistical factor derived from the light finger pressure applied by the general public, or a test group representative of the general population. The third component is a conductive elastomer 30 which is formed as a sandwich, in which a conductive portion 40 is layered between two insulating layers 70. The conductive portion 40 is constructed from strips of conductive material alternating with strips of insulating material, in order to transfer electric potential between upper side and lower side of the conductive elastomer 30. The forth component is the switch circuit printed on PCB 50 which, upon receiving electrical potential, abridges connecting wires 60, effectively causing electrical connectivity between the wires 60. The wires 60 may be external wires attached to PCB 50, as shown, or conducting wires printed on PCB 50 according to one of the embodiments. The wires or any other connecting arrangement is referred to hereinafter as ports.
Fig. Ib is an exploded view of the piezoelectric switch according to one of the embodiments of the invention. The automatic assembly of the piezoelectric switch is described in relations to Fig. Ia and begins by providing a metal foil sheet 10. The provided metal foil sheet 10 should have enough width to cover the piezoelectric ceramic 20 and conductive elastomer 30, whereas its length should be long enough to bend around the PCB 50, as shown in Fig. Ib. Next, a piezoelectric ceramic 20 is attached or glued to the metal foil sheet 10 in the area designated to receive the impact of light finger pressure applied to the other side of the metal foil sheet 10. Conductive elastomer 30 is then provided for placing on the piezoelectric ceramic 20, which in turn is responsible for conducting the electric potential of the piezoelectric ceramic 20 to the switching circuit on PCB 50. All three components: metal foil sheet 10, piezoelectric ceramic 20, and conductive elastomer 30, are thus placed on PCB 50 and securely fastened to PCB 50 by bending both sides of metal foil 10 to clamp over the PCB 50, effectively enclosing the piezoelectric ceramic 20 and elastomer 30 inside. Thus when the light finger pressure is applied to metal foil sheet 10 from the outer side, the pressure is transferred to the piezoelectric ceramic 20 which in turn produces an electric potential. The electric potential is then conducted by the conductive elastomer 30 to circuit 50, which in turn abridges the gap between connecting ports 60, effectively interconnecting the switch.
Fig. 2 is a perspective view of the assembled piezoelectric switch according to one of the embodiments. The metal foil sheet 10 is bended on both sides in order to cover and protect the inner components of the piezoelectric switch. Inside the protection of the metal foil sheet 10 are the piezoelectric ceramic 20 which is attached under the metal sheet 10, the conductive elastomer 30, and the switch circuit on PCB 50.
Fig. 3 is a perspective view of an array of assembled piezoelectric switches mounted on a PCB slider according to one of the embodiments. In this embodiment a number of piezoelectric switches, each having its own metal foil sheet covering 10, are mounted on a single PCB slider 50 in an automated process, as described in relation to Fig. Ib, and the switches connect between conductive ports printed in the PCB 50. The PCB slider may have a single printed circuit having a number of switches each having its own metal foil sheet 10 enclosing the inner parts of the switch.
Fig. 4a is a spread view of another piezoelectric switch and its components according to one of the embodiments, and Fig. 4b is an exploded view of the same piezoelectric switch. In this embodiment the piezoelectric ceramic 20 is positioned off-center of the metal foil sheet 10. Eventually, at the end of the assembly, the piezoelectric ceramic 20 is bound to be closer to one of the foil sheet 10 bended sides. The proximity of the piezoelectric ceramic 20 to one of the bended sides of the foil sheet 10 causes the piezoelectric ceramic 20 to produce an electric potential even when softer pressures than light finger pressures are applied, thus improving the sensitiveness of the switch. The rest of the switch components are similar to the components described before in relations to Fig. Ia and Fig. Ib.
While some embodiments of the invention have been described by way of illustration, it will be apparent that the invention can be carried into practice with many modifications, variations and adaptations, and with the. use of numerous equivalents or alternative solutions that are within the scope of persons skilled in the art, without departing from the spirit of the invention or exceeding the scope of the claims.

Claims

1. A method for fully automated production of a piezoelectric switch comprising the steps of: a. providing a pliable metal sheet, suitable to flex under pressure; b. providing and attaching to said metal sheet a piezoelectric ceramic element, which is capable of developing an electric potential under pressure; ■ c. providing a conductive elastomeric element juxtaposed to and in contact on one side with said piezoelectric ceramic element; d. providing a switching circuit, printed in a PCB, having two electrically disconnected ports, said PCB being juxtaposed to and in contact with the other side of said conductive elastomeric element; and e. bending both sides of said metal sheet to clamp over said PCB, to create a sandwich-like structure enclosing said piezoelectric ceramic element and said elastomeric element.
2. A method according to claim 1, where the piezoelectric ceramic element is positioned off-center of the pliable metal sheet.
3. A method according to claim 1, where more than one piezoelectric switch is produced on a PCB slider.
4. A piezoelectric switch comprising: a. a switching circuit, printed in a PCB, having two electrically disconnected ports; b. a piezoelectric ceramic element which is capable of developing an electric potential under pressure; c. a conductive elastomeric element; and d. a pliable metal sheet suitable to flex under pressure, having a length sufficient to clamp on opposite sides of said PCB.
5. A switch according to claim 4, where the piezoelectric ceramic element is positioned off-center of the pliable metal sheet.
PCT/IL2008/000057 2007-01-15 2008-01-14 A method for the fully automated production of a piezoelectric switch and a process therefor WO2008087630A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP08702638A EP2104588B1 (en) 2007-01-15 2008-01-14 A method for the fully automated production of a piezoelectric switch and a process therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IL180715 2007-01-15
IL180715A IL180715A (en) 2007-01-15 2007-01-15 Method for the fully automated production of a piezoelectric switch and a process therefor

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WO2008087630A2 true WO2008087630A2 (en) 2008-07-24
WO2008087630A3 WO2008087630A3 (en) 2010-01-07

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IL (1) IL180715A (en)
WO (1) WO2008087630A2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2983353A1 (en) * 2011-11-24 2013-05-31 Apem Piezoelectric switch for commutation device i.e. keyboard, of human computer interface, has electric connection provided between printed circuit and electrodes, and compression springs arranged between piezoelectric element and circuit

Citations (2)

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Publication number Priority date Publication date Assignee Title
EP0343685A2 (en) 1988-05-27 1989-11-29 Makash - Advanced Piezo Technology Piezoelectric switch
US6064141A (en) 1997-07-01 2000-05-16 Piezo Switch Development Inc. Piezoelectric switch

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US3660602A (en) * 1970-06-01 1972-05-02 Conrac Corp Microphone cartridge with amplifier
US4430595A (en) * 1981-07-29 1984-02-07 Toko Kabushiki Kaisha Piezo-electric push button switch
US5349263A (en) * 1991-10-09 1994-09-20 Mitsumi Electric Co., Ltd. Pointing device suitable for miniaturization
US5231326A (en) * 1992-01-30 1993-07-27 Essex Electronics, Inc. Piezoelectric electronic switch
JPH11218424A (en) * 1998-02-03 1999-08-10 Alps Electric Co Ltd Vibration type gyroscope
US6310428B1 (en) * 1999-11-26 2001-10-30 Itt Manufacturing Enterprises, Inc. Piezoelectric switch with audible feedback

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Publication number Priority date Publication date Assignee Title
EP0343685A2 (en) 1988-05-27 1989-11-29 Makash - Advanced Piezo Technology Piezoelectric switch
US6064141A (en) 1997-07-01 2000-05-16 Piezo Switch Development Inc. Piezoelectric switch

Non-Patent Citations (1)

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Title
See also references of EP2104588A4

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2983353A1 (en) * 2011-11-24 2013-05-31 Apem Piezoelectric switch for commutation device i.e. keyboard, of human computer interface, has electric connection provided between printed circuit and electrodes, and compression springs arranged between piezoelectric element and circuit

Also Published As

Publication number Publication date
WO2008087630A3 (en) 2010-01-07
IL180715A0 (en) 2007-06-03
EP2104588A2 (en) 2009-09-30
IL180715A (en) 2011-04-28
EP2104588B1 (en) 2012-11-21
EP2104588A4 (en) 2010-07-07

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