EP2059351A1 - Vibrationsgenerator - Google Patents
VibrationsgeneratorInfo
- Publication number
- EP2059351A1 EP2059351A1 EP07822254A EP07822254A EP2059351A1 EP 2059351 A1 EP2059351 A1 EP 2059351A1 EP 07822254 A EP07822254 A EP 07822254A EP 07822254 A EP07822254 A EP 07822254A EP 2059351 A1 EP2059351 A1 EP 2059351A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- swing arm
- vibration generator
- piezoelectric actuator
- leg
- carrier
- 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.)
- Granted
Links
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000000465 moulding Methods 0.000 claims description 2
- 239000010410 layer Substances 0.000 description 11
- 230000005540 biological transmission Effects 0.000 description 9
- 239000002131 composite material Substances 0.000 description 6
- 238000005755 formation reaction Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 5
- 238000005452 bending Methods 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000001465 metallisation Methods 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
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 known from the publication US 5,229,744.
- An object to be solved is to provide a further vibration generator which is particularly efficient.
- 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 min. at least one angled area, 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.
- Figure 1 in cross section a vibration generator with a swing arm in U-shape with unequal length legs, wherein the lower leg a piezoelectric actuator is attached;
- Figure 2 in cross-section a vibration generator with a swing arm in U-shape with unequal length of legs, wherein the upper leg a piezoelectric actuator is attached;
- FIG. 3A in cross section an exemplary piezoelectric actuator
- FIG. 3B is a perspective view of another exemplary piezoactuator;
- Figure 4 shows a variant of the vibration generator shown in Figure 1, in which between the piezoelectric actuator and the swing arm, a gap is formed.
- FIG. 5 in cross-section a vibration generator with a piezoelectric actuator, which is clamped between a swing arm and a carrier;
- FIG. 6 in cross section a vibration generator with a swing arm in a U-shape, wherein between the legs of the swing arm, a piezoelectric actuator is arranged;
- FIG. 7 shows a cross-section of a vibration generator with a swinging arm which has formations for receiving the piezoactuator
- FIG. 8 shows a perspective view of a piezoelectric actuator with tapered edge regions.
- FIG. 1 shows a vibration generator with a swinging arm 2, which is angled several times, one end, fastening area 2d, of the swinging arm being fastened in the carrier 4.
- 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 arranged between the legs 2a, 2b, but is coupled only to the lower leg 2a, while it is spaced from the upper leg 2b.
- the piezoelectric actuator can be arranged on the upper leg 2b.
- an intermediate layer 5 is arranged between the piezoactuator 1 and the leg to which it is coupled.
- 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 FIGS. 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 inner electrodes 7 in the variant according to FIG.
- 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 inner electrodes 7 in the variant according to FIG. 3B are arranged perpendicular to the contact surface of the piezoactuator 1. In this case, vibrations are excited perpendicular to the internal electrodes with the piezoelectric coefficient d33. 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 shows a variant in which an air gap is provided between the piezoactuator 1 and the lower leg of the oscillating arm 2, to which the actuator is fastened.
- 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 is arranged between the legs 2 a, 2 b of the U-shaped swinging arm 2.
- 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 is arranged between the piezoactuator 1 and the respective limb of the oscillating arm 2, which is preferably fixedly connected to the actuator body or is 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 preferably aligned in the arrangement of the actuator between the legs of the swing arm 2, as in the variant according to the figure 8 parallel to the main 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 cbi and di5.
- the design of the vibration generator in particular the shape of the oscillating arm and the internal structure of the piezoelectric actuator, is not limited to the examples shown in the figures.
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)
Abstract
Description
Claims
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 (de) | 2006-11-13 | 2007-11-06 | Vibrationsgenerator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP2059351A1 true EP2059351A1 (de) | 2009-05-20 |
| EP2059351B1 EP2059351B1 (de) | 2015-03-04 |
Family
ID=38929632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP07822254.4A Not-in-force EP2059351B1 (de) | 2006-11-13 | 2007-11-06 | Vibrationsgenerator |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP2059351B1 (de) |
| DE (1) | DE102006053421A1 (de) |
| WO (1) | WO2008058870A1 (de) |
Families Citing this family (1)
| 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)
| 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 |
| ATE311034T1 (de) * | 2000-03-23 | 2005-12-15 | 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 |
| AU2003248075B2 (en) * | 2002-07-16 | 2008-06-05 | Teijin Limited | Method and device of producing multiple doser for powdered medicine |
-
2006
- 2006-11-13 DE DE200610053421 patent/DE102006053421A1/de not_active Withdrawn
-
2007
- 2007-11-06 WO PCT/EP2007/061937 patent/WO2008058870A1/de not_active Ceased
- 2007-11-06 EP EP07822254.4A patent/EP2059351B1/de not_active Not-in-force
Non-Patent Citations (1)
| Title |
|---|
| See references of WO2008058870A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| EP2059351B1 (de) | 2015-03-04 |
| WO2008058870A1 (de) | 2008-05-22 |
| DE102006053421A1 (de) | 2008-05-15 |
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