EP2059351B1 - Générateur de vibrations - Google Patents

Générateur de vibrations Download PDF

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Publication number
EP2059351B1
EP2059351B1 EP07822254.4A EP07822254A EP2059351B1 EP 2059351 B1 EP2059351 B1 EP 2059351B1 EP 07822254 A EP07822254 A EP 07822254A EP 2059351 B1 EP2059351 B1 EP 2059351B1
Authority
EP
European Patent Office
Prior art keywords
piezo actuator
vibration generator
oscillating arm
generator according
swing arm
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.)
Not-in-force
Application number
EP07822254.4A
Other languages
German (de)
English (en)
Other versions
EP2059351A1 (fr
Inventor
Wolfgang Athenstaedt
Heinz Florian
Igor Kartashev
Klaus Reichmann
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.)
TDK Electronics AG
Original Assignee
Epcos AG
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 Epcos AG filed Critical Epcos AG
Publication of EP2059351A1 publication Critical patent/EP2059351A1/fr
Application granted granted Critical
Publication of EP2059351B1 publication Critical patent/EP2059351B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0603—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using a piezoelectric bender, e.g. bimorph

Definitions

  • a vibration generator with a piezoelectric element is from the document US 5,229,744 known.
  • a vibration generator in which vibrating plates are mounted with their edge on a connecting plate.
  • the connection plate can be arranged directly on a support. Instead, one of the vibrating plates may be mounted on an edge portion opposite the connecting plate via a connecting part on a support. There may be several vibrating plates and also several connecting plates.
  • a vibration generator is described in which a piezoelectric crystal is mounted on a carrier and coupled to two oscillating arms of different resonance frequencies.
  • Object of the present invention is to provide a vibration generator for mobile phones, which can be produced easily and with compact dimensions and whose frequency is largely independent of material properties tunable. This object is achieved with the vibration generator for mobile phones with the features of claim 1. Embodiments emerge from the dependent claims.
  • a vibration generator provided for generating a vibration alarm is provided with a vibratable oscillating arm which has at least one bend or an angled region, wherein the oscillating arm is coupled to a piezoactuator.
  • the swing arm By the specified embodiment of the swing arm it is possible to achieve a particularly large length of the swing arm with a small size.
  • the great length has the advantage that a low oscillation frequency can be achieved with it.
  • a further reduction of the oscillation frequency can be effected by a weight connected to the oscillating arm.
  • the swing arm can be attached to a carrier.
  • the bend may be formed as a fold.
  • the oscillating arm is capable of oscillating except for its end region fastened in or on the carrier.
  • a first end of the swing arm is preferably vibratable and a second end attached to or in the carrier.
  • the carrier is preferably the housing or a printed circuit board of a radio, which is preferably portable.
  • the piezoelectric actuator can be connected to a voltage source, from which it is electrically driven to vibrate.
  • the piezoelectric actuator has a body, in which a plurality of internal electrodes lying parallel to one another can be arranged, which are alternately connected to a first and a second outer electrode.
  • the outer electrodes are preferably arranged on the opposite side surfaces of the body. These side surfaces are arranged in a variant parallel to the main surface of the swing arm. Alternatively, they can stand perpendicular to the main surface of the swing arm.
  • the swing arm preferably has a major surface which is disposed substantially parallel to the surface of the carrier.
  • the oscillating arm has an angled or curved coupling region, which is coupled to the carrier.
  • the coupling region is arranged in a variant perpendicular or oblique to the main surface of the swing arm.
  • the swing arm is formed in an advantageous embodiment as a U-piece with two legs and a yoke connecting the legs, ie connector.
  • the remote from the connector end of the first, z. B. upper leg is preferably freely oscillatable, whereas the end remote from the connecting piece of the second leg is coupled to the carrier.
  • the second, z. B. lower leg preferably has a major surface which is aligned parallel to the main surface of the first leg, as well as at least an angled portion which is provided for attachment to the carrier or in the carrier interior.
  • the swing arm is preferably made of an electrically conductive material and can be used as an electrical lead to the piezoelectric actuator.
  • the swing arm is preferably in one piece, for example formed from a multiply bent metal sheet.
  • the swing arm contains in a further variant, preferably reinforced with glass fibers plastic.
  • the surface of the swing arm may in this case have a metallization, which can be used as an electrical supply to the piezoelectric actuator.
  • the main surfaces of the legs running parallel to the carrier surface have, in a variant, different lengths from each other.
  • the length of the major surface of the leg of the U-piece coupled to the carrier may be greater than that of the leg having a free end. It can also be chosen shorter.
  • the piezoelectric actuator is attached in a variant on the first or second leg of the U-piece and spaced from the other leg.
  • the piezoelectric actuator can also be arranged between the legs of the U-piece, wherein it is preferably spaced from the connecting piece.
  • the piezoelectric actuator is preferably clamped in this case between the legs and biased.
  • a preferably electrically insulating intermediate layer is arranged between the piezoactuator and the oscillating arm.
  • the intermediate layer is preferably as one Adhesive layer provided to mediate the adhesion between the actuator and the swing arm.
  • the piezoelectric actuator is firmly connected in one variant by means of the intermediate layer over the entire surface with the swing arm.
  • the piezoelectric actuator is arranged in an advantageous variant between the swing arm and the carrier, preferably clamped and biased.
  • a weight is attached in a variant.
  • the weight value is - depending on the length of the swing arm and the weight of the piezoelectric actuator - preferably chosen such that a predetermined resonance frequency is achieved in the vibration generator.
  • the piezoelectric actuator is preferably excited with an electrical signal whose frequency is at the resonant frequency of the vibration generator or in the vicinity of this frequency.
  • each transmission element preferably has a taper.
  • the base surface is preferably fixedly connected to the actuator body. The edge remote from the base surface and an area of the prism adjacent to this edge touches the swinging arm.
  • the actuator body with such tapers to minimize a contact area between the actuator and the swing arm.
  • the oscillating arm preferably has at least one formation into which a contact region of the piezoelectric actuator or the transmission element protrudes.
  • the molding is formed in a variant in the form of a groove and formed for example by a bulge or notch of the swing arm. If the piezoelectric actuator between the swing arm and the carrier should be biased, such a shape can be provided in the carrier.
  • the orientation of the vibration axis of the piezoelectric actuator, d. H. an axis along which the vibrations of the actuator body are excited preferably corresponds to the maximum cross-sectional size, d. H. the length, the body. Thus vibrations with the lowest frequency can be excited. Other orientations of the vibration axis are also possible.
  • the oscillation axis of the piezoelectric actuator is preferably aligned in the longitudinal direction of this oscillating arm in the case of a piezoactuator fastened to the oscillating arm.
  • a region of the oscillating arm connected to it is pulled along and thus deformed. Due to the expansion of the actuator upon application of an electrical voltage occurs a mechanical bending stress, which deflects the swing arm.
  • vibrations of the system can be excited, comprising the composite of the actuator and the swing arm.
  • the vibration axis of the piezoactuator which is arranged between two major surfaces of the legs of the swing arm, is preferably perpendicular to these major surfaces, that is aligned perpendicular to the alignment of the legs of the swing arm.
  • the piezoelectric actuator may comprise two bodies with mutually oppositely directed polarization axes. These bodies are in a first variant z. B. by bonding to form a composite of the body firmly connected. This composite is firmly connected to the swing arm, whereby a composite of the body and the swing arm comes about.
  • the swing arm is arranged between these bodies.
  • Each body is firmly connected to the swing arm, whereby a composite of the body and the swing arm comes about.
  • bending vibrations of the composite of the body and the swinging arm are produced.
  • FIG. 1 a vibration generator with a swinging arm 2 is shown, which is angled several times, with one end, and fastening area 2 d, of the swing arm in the carrier 4 is fixed.
  • the swing arm 2 has a U-piece with a lower leg 2a and an upper leg 2b and a yoke, d. H. Connecting piece 2c, which connects the legs 2a, 2b. The main surfaces of the legs 2a, 2b are aligned in the rest state parallel to the surface of the carrier 4.
  • a piezoelectric actuator 1 is attached at the top of the lower leg 2a.
  • a Weight 3 is attached at the free end of the upper leg 2b.
  • the lower leg 2a is formed shorter than the upper leg 2b. In this case, a particularly large oscillation amplitude of the free end of the swing arm can be achieved.
  • the piezoelectric actuator 1 is disposed between the legs 2a, 2b, but coupled only to the lower leg 2a, while it is spaced from the upper leg 2b.
  • the piezoelectric actuator can also be arranged on the upper leg 2b.
  • This layer is preferably electrically insulating, if electrical contact between the actuator and the electrically conductive swing arm 2 is to be prevented.
  • this layer may also be electrically conductive, if an electrical contact, for example, between the lower outer electrode of the actuator and the electrically conductive swing arm 2 is intended.
  • the piezoelectric actuator 1 comprises a body with a plurality of piezoelectric layers, which preferably contain ceramic.
  • Internal electrodes 7 are arranged between the piezoelectric layers and external electrodes 71, 72 are arranged on the surface of the body, see Fig. 3A, 3B , A plurality of first internal electrodes are conductively connected to the first external electrode 71 and a plurality of second internal electrodes are connected to the second external electrode 72. First and second internal electrodes are arranged alternately.
  • the outer electrodes 71, 72 are electrically contacted via connecting wires 9.
  • the surfaces of the internal electrodes 7 in the variant according to the FIG. 3A are parallel to the support surface of the piezoelectric actuator 1, that is arranged parallel to the surface region of the swing arm 2, to which the piezoelectric actuator 1 is coupled. In this case, vibrations are excited parallel to the internal electrodes with the piezoelectric coefficient d 31 .
  • the lower region of the outer electrode 71 may in this case be conductively connected to the oscillating arm 2 by means of a conductive adhesive, ie a conductive intermediate layer 5.
  • the upper portion of the outer electrode 72 is connected to a lead wire 9. Alternatively, it is possible to contact the arranged on the side surfaces of the actuator body portions of the outer electrodes 71, 72 via connecting wires.
  • the surfaces of the internal electrodes 7 in the variant according to the FIG. 3B are arranged perpendicular to the bearing surface of the piezoelectric actuator 1. In this case, vibrations are excited perpendicular to the internal electrodes with the piezoelectric coefficient d 33 . So that a short circuit between the outer electrodes 71, 72 can be prevented, the piezoelectric actuator is in this case preferably secured by means of an electrically insulating intermediate layer 5 on the swing arm 2.
  • FIG. 4 a variant is shown, in which between the piezoelectric actuator 1 and the lower leg of the swing arm 2, to which the actuator is attached, an air gap is provided.
  • the actuator is connected to the swing arm by means of connecting elements 6, which serve as spacers to form the gap.
  • the piezoelectric actuator 1 is arranged in this case between the main surface 2b of the swing arm and the carrier.
  • the position of a contact area between the actuator and the surface 2b determines the length of a lever arm formed by a swingable portion of the surface 2b and its oscillation frequency.
  • the actuator is spaced from the angled portion 2c of the swing arm 2, but disposed in the vicinity of this range. Alternatively, the actuator can directly adjoin this area.
  • the piezoelectric actuator 1 between the legs 2a, 2b of the U-shaped swing arm 2 is arranged.
  • the carrier 4 forms in this case a housing in which the vibration generator is included. In other embodiments, the carrier 4 may be formed as a housing.
  • a transmission element 8 which is preferably fixedly connected to the actuator body or part of this body.
  • the transmission elements 8 are used to transmit vibrations from the piezoelectric actuator 1 to the oscillating arm 2.
  • Each transmission element 8 is in the form of a prism whose base surface faces the piezoelectric actuator, see Fig. 8 ,
  • a groove-shaped formation 10 is formed in each leg.
  • the formation 10 is formed as a bulge.
  • the inner electrodes 7 are in the arrangement of the actuator between the legs of the swing arm 2 preferably as in the variant according to the FIG. 8 aligned parallel to the major surfaces of the legs.
  • the vibration is excited in this case perpendicular to the internal electrodes 7 with a piezoelectric coefficient d 33 .
  • a different orientation of the internal electrodes is also possible in principle, wherein in particular a piezoelectric effect can be exploited, which is characterized by piezoelectric coefficients d 31 and d 15 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
  • Manipulator (AREA)

Claims (14)

  1. Générateur de vibrations pour téléphone portable, comprenant :
    - un actionneur piézoélectrique (1),
    - un bras oscillant (2) capable d'osciller, qui comprend des branches de longueurs différentes (2a, 2b), une pièce de connexion (2c) et une région de fixation coudée (2d), le bras oscillant étant accouplé à l'actionneur piézoélectrique,
    - un poids (3) connecté au bras oscillant (2) et
    - un support (4) sur lequel est fixée la région de fixation (2d),
    - l'une des branches (2a) reliant la région de fixation (2d) et la pièce de connexion (2c) l'une à l'autre et l'autre branche (2b) reliant la pièce de connexion (2c) et le poids (3) l'un à l'autre.
  2. Générateur de vibrations selon la revendication 1, dans lequel le bras oscillant (2) est réalisé d'une seule pièce à partir d'une tôle métallique cintrée plusieurs fois.
  3. Générateur de vibrations selon la revendication 1, dans lequel le bras oscillant (2) est réalisé avec un plastique renforcé par des fibres de verre et
    la surface du bras oscillant présente une métallisation en tant qu'amenée d'alimentation électrique pour l'actionneur piézoélectrique (1).
  4. Générateur de vibrations selon l'une quelconque des revendications 1 à 3, dans lequel
    l'actionneur piézoélectrique (1) est fixé au niveau des deux branches (2a, 2b) du bras oscillant (2) et est espacé de la pièce de connexion (2c).
  5. Générateur de vibrations selon la revendication 4, dans lequel l'actionneur piézoélectrique (1) est serré et précontraint entre les branches (2a, 2b).
  6. Générateur de vibrations selon la revendication 4 ou 5, dans lequel des éléments de transmission (8) sont disposés entre l'actionneur piézoélectrique (1) et les branches (2a, 2b) du bras oscillant (2),
    les éléments de transmission (8) présentent un rétrécissement et
    les branches (2a, 2b) présentent à chaque fois une formation en creux (10) dans laquelle pénètre l'un des éléments de transmission (8).
  7. Générateur de vibrations selon l'une quelconque des revendications 1 à 3, dans lequel
    l'actionneur piézoélectrique (1) est fixé à une branche (2b) du bras oscillant (2) et au support (4) et est espacé de la pièce de connexion (2c).
  8. Générateur de vibrations selon la revendication 7, dans lequel l'actionneur piézoélectrique (1) est précontraint entre le bras oscillant (2) et le support (4).
  9. Générateur de vibrations selon la revendication 7 ou 8, dans lequel des éléments de transmission (8) sont disposés entre l'actionneur piézoélectrique (1) et la branche (2b) au niveau de laquelle l'actionneur piézoélectrique (1) est fixé, et entre l'actionneur piézoélectrique (1) et le support (4),
    les éléments de transmission (8) présentent un rétrécissement et
    la branche (2b) au niveau de laquelle l'actionneur piézoélectrique (1) est fixé et le support (4) présentent chacun une formation en creux (10) dans laquelle pénètre l'un des éléments de transmission (8).
  10. Générateur de vibrations selon l'une quelconque des revendications 1 à 9, dans lequel
    plusieurs électrodes internes (7) situées parallèlement les unes aux autres sont disposées dans l'actionneur piézoélectrique (1), lesquelles sont raccordées en alternance à une première et à une deuxième électrode externe (71, 72),
    les électrodes internes (7) sont disposées parallèlement à une région de surface du bras oscillant (2) et l'actionneur piézoélectrique (1) est accouplé à cette région de surface.
  11. Générateur de vibrations selon l'une quelconque des revendications 1 à 9, dans lequel
    plusieurs électrodes internes (7) situées parallèlement les unes aux autres sont disposées dans l'actionneur piézoélectrique (1), lesquelles sont raccordées en alternance à une première et à une deuxième électrode externe (71, 72),
    les électrodes internes (7) sont disposées perpendiculairement à une région de surface du bras oscillant (2) et
    l'actionneur piézoélectrique (1) est accouplé à cette région de surface.
  12. Générateur de vibrations selon l'une quelconque des revendications 1 à 11, dans lequel
    l'actionneur piézoélectrique (1) est connecté par le biais d'éléments de connexion (6) au bras oscillant (2) et
    les éléments de connexion (6) sont disposés à distance les uns des autres et servent à former une fente entre l'actionneur piézoélectrique et le bras oscillant.
  13. Générateur de vibrations selon la revendication 10, dans lequel
    une couche intermédiaire électriquement conductrice (5) est disposée entre l'actionneur piézoélectrique (1) et le bras oscillant (2) et
    la couche intermédiaire (5) relie une électrode externe (71) de l'actionneur piézoélectrique (1) de manière conductrice au bras oscillant (2).
  14. Générateur de vibrations selon la revendication 11, dans lequel
    l'actionneur piézoélectrique (1) est fixé au bras oscillant (2) au moyen d'une couche intermédiaire électriquement isolante (5).
EP07822254.4A 2006-11-13 2007-11-06 Générateur de vibrations Not-in-force EP2059351B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE200610053421 DE102006053421A1 (de) 2006-11-13 2006-11-13 Vibrationsgenerator
PCT/EP2007/061937 WO2008058870A1 (fr) 2006-11-13 2007-11-06 Générateur de vibrations

Publications (2)

Publication Number Publication Date
EP2059351A1 EP2059351A1 (fr) 2009-05-20
EP2059351B1 true EP2059351B1 (fr) 2015-03-04

Family

ID=38929632

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07822254.4A Not-in-force EP2059351B1 (fr) 2006-11-13 2007-11-06 Générateur de vibrations

Country Status (3)

Country Link
EP (1) EP2059351B1 (fr)
DE (1) DE102006053421A1 (fr)
WO (1) WO2008058870A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010021867A1 (de) 2010-05-28 2011-12-01 Eurocopter Deutschland Gmbh Kraftgenerator zur Anbringung an einer Struktur

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2983903A (en) 1956-11-13 1961-05-09 Philipps Electronics Corp Crystal vibrated reed and receiver and system of communication using same
US5229744A (en) 1990-11-27 1993-07-20 Ngk Spark Plug Co., Ltd. Piezoelectric type pager
US5488351A (en) * 1993-08-02 1996-01-30 Motorola, Inc. Rocking vibrator alert apparatus driven by opposite phases of a frequency generator
DE19727951A1 (de) * 1997-07-01 1999-01-21 Stettner Gmbh & Co Vibratoreinrichtung zur Erzeugung eines stillen Alarms
DE19818988A1 (de) * 1998-04-28 1999-11-11 Siemens Ag Elektronisches Gerät mit einem elektroakustischen Wandler
US5945772A (en) * 1998-05-29 1999-08-31 Motorla, Inc. Damped resonant piezoelectric alerting device
US6078126A (en) * 1998-05-29 2000-06-20 Motorola, Inc. Resonant piezoelectric alerting device
DE60115220T2 (de) * 2000-03-23 2006-08-17 Elliptec Resonant Actuator Ag Vibrationsantrieb und herstellungsverfahren sowie verwendung desselben
JP2002159917A (ja) 2000-11-22 2002-06-04 Terumo Kogyo:Kk 振動発生装置
US7369115B2 (en) * 2002-04-25 2008-05-06 Immersion Corporation Haptic devices having multiple operational modes including at least one resonant mode
WO2004007007A1 (fr) * 2002-07-16 2004-01-22 Teijin Limited Procede et dispositif de production d'un doseur multiple pour un medicament en poudre

Also Published As

Publication number Publication date
WO2008058870A1 (fr) 2008-05-22
DE102006053421A1 (de) 2008-05-15
EP2059351A1 (fr) 2009-05-20

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