WO2003065552A2 - Device for producing mechanical vibrations - Google Patents

Device for producing mechanical vibrations Download PDF

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Publication number
WO2003065552A2
WO2003065552A2 PCT/IB2003/000179 IB0300179W WO03065552A2 WO 2003065552 A2 WO2003065552 A2 WO 2003065552A2 IB 0300179 W IB0300179 W IB 0300179W WO 03065552 A2 WO03065552 A2 WO 03065552A2
Authority
WO
WIPO (PCT)
Prior art keywords
component
ofthe
counterforce
permanent magnet
coil configuration
Prior art date
Application number
PCT/IB2003/000179
Other languages
French (fr)
Other versions
WO2003065552A3 (en
Inventor
Ernst Ruberl
Stefan Scheichl
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2003065552A2 publication Critical patent/WO2003065552A2/en
Publication of WO2003065552A3 publication Critical patent/WO2003065552A3/en

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K33/00Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/16Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with polarised armatures moving in alternate directions by reversal or energisation of a single coil system
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02KDYNAMO-ELECTRIC MACHINES
    • H02K33/00Motors with reciprocating, oscillating or vibrating magnet, armature or coil system
    • H02K33/02Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs
    • H02K33/04Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation
    • H02K33/06Motors with reciprocating, oscillating or vibrating magnet, armature or coil system with armatures moved one way by energisation of a single coil system and returned by mechanical force, e.g. by springs wherein the frequency of operation is determined by the frequency of uninterrupted AC energisation with polarised armatures

Definitions

  • the invention relates to a device for producing mechanical vibrations.
  • the invention further relates to a communications device having a device for producing mechanical vibrations.
  • a communications device namely a portable telephone, in particular a cell phone, with a device for producing mechanical vibrations and consequently such a device for producing mechanical vibrations have been marketed in manifold variants and are also known for example from patent document US 5,379,032 A.
  • the device for producing mechanical vibrations is equipped with a magnet, which is arranged between two bumpers, preferably of rubber, and which is moved to and fro between these bumpers during operation and successively strikes against each ofthe two bumpers, wherein the successive impacting ofthe magnet against the bumpers produces the desired vibrations.
  • the impact ofthe magnet against the bumpers produces relatively high mechanical loads, which is unfavorable with regard to maximum service life.
  • the mechanical impact ofthe magnet on the bumper does not only result in the production of vibrations but also in the production of disturbing audible noise, which is not desirable, however.
  • a device according to the invention may be characterized in the following way, namely:
  • a device for producing mechanical vibrations which comprises at least one component displaceable under the action of a magnetic field, which component is mounted so as to be displaceable along a movement path, and which comprises a coil configuration surrounding the component, and which comprises energy supply means for supplying energy to the coil configuration, wherein magnetic fields may be produced by the energy supplied to the coil configuration by means of said coil configuration, which magnetic fields occur in alternating succession at at least one alternation frequency and act on the component in opposing directions and thereby effect to-and-fro displacement ofthe component, and which comprises counterforce means, which are designed and provided for the constant application of in each case a counterforce opposing displacement ofthe component under the action of the magnetic fields, wherein the component and the counterforce means are components of an oscillatory system, in which a mechanical resonant frequency is dependent on the mass of the component and on a counterforce characteristic value ofthe counterforce means.
  • a communications device such that a communications device according to the invention may be characterized in the following way, namely:
  • a communications device having a device for producing mechanical vibrations, which comprises a coil configuration surrounding the component, and which comprises energy supply means for supplying energy to the coil configuration, wherein magnetic fields may be generated by the energy supplied to the coil configuration by means of said coil configuration, which magnetic fields occur in alternating succession at at least one alternation frequency and act on the component in opposing directions and thereby effect to-and-fro displacement ofthe component, and which comprises counterforce means, which are designed and provided for the constant application of in each case a counterforce opposing displacement ofthe component under the action ofthe magnetic fields, wherein the component and the counterforce means are components of an oscillatory system, in which a mechanical resonant frequency is dependent on the mass ofthe component and on a counterforce characteristic value ofthe counterforce means.
  • a device for producing mechanical vibrations is provided in a structurally simple and consequently economic manner and additionally also in reliable manner, in which device virtually no disturbing audible noises occur and which makes it possible to manage with a relatively low mass component decisively influencing the intensity ofthe vibrations, such that a relatively small amount of space is needed, because this component may be displaced over a relatively large displacement path, i.e. a large travel, such that a good compromise may be achieved between the space required for such a device and the intensity ofthe mechanical vibrations achievable with such a device.
  • the counterforce means are formed by two rubber cylinders or by two compression springs each in the form of cylindrical or conical helical springs, wherein both the rubber cylinders and the compression springs are each permanently connected on the one hand with the displaceably mounted component and on the other hand with one of two stationary counter-bearings and act in opposite directions on the displaceably mounted component.
  • both the rubber cylinders and the compression springs are each permanently connected on the one hand with the displaceably mounted component and on the other hand with one of two stationary counter-bearings and act in opposite directions on the displaceably mounted component.
  • the displaceably mounted component may comprise soft iron or a combination of at least one soft iron part and at least one permanent magnet.
  • the component it has proven particularly advantageous for the component to take the form of a permanent magnet. In this way, a device for producing mechanical vibrations may be provided which is particularly efficient.
  • auxiliary magnets provided as counterforce means, allow a particularly simple structural embodiment. Moreover, such auxiliary magnets are additionally advantageous when it comes to achieving a high level of efficiency.
  • Fig. 1 is an oblique view of a communications device, in this case a cell phone according to an example of embodiment ofthe invention, which comprises a device for producing mechanical vibrations according to a first example of embodiment ofthe invention.
  • Fig. 2 is an oblique view ofthe device for producing mechanical vibrations in the cell phone according to Fig. 1.
  • Fig. 3 is a longitudinal section through the device for producing mechanical vibrations according to Fig. 2.
  • Fig. 4 is a schematic view ofthe device for producing mechanical vibrations according to Figs. 2 and 3 in the form of a block diagram.
  • Fig. 5 is a diagram showing an electrical supply signal occurring in the device according to Figs. 2 to 4.
  • Fig. 6 is a diagram showing part ofthe electrical supply signal occurring in the device according to Fig. 5 over a longer time scale.
  • Fig. 7 shows a device for producing mechanical vibrations according to a second example of embodiment ofthe invention.
  • Fig. 1 shows a cell phone 1.
  • the cell phone 1 comprises a housing 2, which is equipped on the housing front wall 3 with an acoustically transmissive cover 4, behind which are arranged a microphone, not shown, and a loudspeaker, not shown, and with a display means 5 and a keypad 6.
  • a device 7, shown only schematically in Fig. 1, for producing mechanical vibrations is accommodated in the housing 2.
  • the device 7 serves to produce vibrations in the event of an incoming call, which vibrations provide a tactile signal to a user ofthe cell phone 1 that a call may or should be taken.
  • the device 7 is shown in more detail in Figs. 2 to 4.
  • the device 7 for producing mechanical vibrations comprises a housing 8, which comprises of two cup-like sleeves 9 and 10 of metal, in the present case of brass. Instead of brass, it is also possible to use non-magnetic or magnetic iron, wherein in the latter case a particularly good magnetic shielding is achieved.
  • Each ofthe two sleeves 9 and 10 comprises four air passage holes 11 in the area of its closed end.
  • a coil holder 12 is accommodated in the housing 8, which coil holder 12 is tubular, in the form of a hollow cylinder, and from which a separating ring 13 projects in its central area.
  • the coil holder 12 consists, together with the separating ring 13, of an electrically insulating material, namely plastic.
  • the coil holder 12 is provided for holding a coil configuration 14.
  • the coil configuration 14 comprises two coil portions 15 and 16, which are connected in parallel with one another, as may be seen from Fig. 4.
  • the construction of the two coil portions 15 and 16, and in particular the winding direction of these two coil portions 15 and 16, is such that the magnetic fields generated at a particular time by means of the two coil portions 15 and 16 are in mutually opposing directions.
  • the coil configuration 14 thus forms drive means for this component.
  • the two coil portions 15 and 16 are connected in electrically conductive manner with two terminal lugs 17 and 18.
  • the terminal lugs 17 and 18 are of electrically conductive construction and are each connected in mechanically and electrically conductive manner with one ofthe sleeves 9 and 10, also consisting of electrically conductive material. In this way, it is ensured that the two sleeves 9 and 10 may be used as electrical terminal fittings for electrically conductive connection and serve for this purpose.
  • the device 7 additionally comprises a component 19 displaceable under the action of a magnetic field.
  • this component 19 takes the form of a permanent magnet 19, which is cylindrical in construction and which is mounted inside the hollow-cylindrical tubular coil holder 12 so as to be displaceable along a movement path which is indicated by a double-headed arrow 20 and in the present case is straight.
  • the device 7 further comprises energy supply means 21, as is clear from Fig. 4.
  • the energy supply means 21 are provided for supplying energy in the form of an electrical supply signal SIG to the coil configuration 14 and formed by an electrical signal generator.
  • the energy supply means 21 are provided spatially separately from the housing 8 ofthe device 7 on a printed circuit board in the communications device 1.
  • the energy supply means 21 may, however, also be connected directly with the housing 8. To this end, the energy supply means 21 are connected in electrically conductive manner with the two sleeves 9 and 10 and consequently with the two terminal lugs 17 and 18.
  • magnetic fields may be generated by means of this coil configuration 14, which occur in alternating succession at at least one alternating frequency f ⁇ and act in opposite directions on the permanent magnet 19 and thereby effect a to-and-fro displacement ofthe permanent magnet 19.
  • the permanent magnet 19 effects a to-and-fro displacement motion parallel to the movement path 20 as a consequence of supplying the supply signal SIG to the coil configuration 14, which results in the production of mechamcal vibrations by means ofthe device 7.
  • the permanent magnet 19 moves an air cushion in the area of each of its two ends 25 and 26, whereby air flows through the air passage holes 11, such that no undesirable air cushion damping arises for the permanent magnet 19.
  • the device 7 additionally comprises counterforce means 22, which in the present case are designed and provided in a particularly advantageous manner for constant application of counterforce in each case opposing displacement ofthe permanent magnet 19 under the action ofthe magnetic fields.
  • the counterforce means 22 comprise two auxiliary magnets 23 and 24, of which one auxiliary magnet 23 is arranged opposite one end 25 ofthe displaceably mounted permanent magnet 19 and the other auxiliary magnet 24 is arranged opposite the other end 26 ofthe displaceably mounted permanent magnet 19. Magnetization ofthe permanent magnet 19 and the auxiliary magnets 23 and 24 and consequently the magnetic polarity ofthe permanent magnet 19 and the auxiliary magnets 23 and 24 are selected, as may be seen from Fig.
  • each auxiliary magnet 23 or 24 constantly exerts a repulsive force on the displaceably mounted permanent magnet 19.
  • the auxiliary magnets 23 and 24 are each held firmly in the relevant sleeve 9 and 10 ofthe housing 8 by means of an adhesive bond.
  • the device 7 is so constructed that the permanent magnet 19 and the counterforce means 22, i.e. the two auxiliary magnets 23 and 24, are components of an oscillatory system 27, in which a mechanical resonant frequency f R is dependent on the mass ofthe permanent magnet 19 and on a counterforce characteristic value ofthe counterforce means 22, in the present case therefore on the repulsive magnetic force of each ofthe auxiliary magnets 23 and 24.
  • This resonant frequency f R represents a desired frequency, at which the to-and-fro displacement motion ofthe permanent magnet 19 should occur.
  • this mechanical resonant frequency f R is not constant, because the mechanical resonant frequency f R is dependent on the travel ofthe permanent magnet 19, in such a way that, in the case of relatively small travel ofthe permanent magnet 19, a relatively small counterforce is exerted on the permanent magnet 19 by the auxiliary magnets 23 and 24, whereas, in the case of relatively large travel ofthe permanent magnet 19, the auxiliary magnets 23 and 24 exert a relatively large counterforce on the permanent magnet 19, wherein the profile ofthe increase from small counterforce to large counterforce is non-linear, and progressive.
  • the permanent magnet 19 initially effects a relatively small travel, relatively small counterforces therefore acting on the permanent magnet 19.
  • the energy supply means 21 are advantageously so designed that the supply of energy to the coil configuration 14 produces an alternately successive occurrence ofthe magnetic fields acting on the permanent magnet 19 with at least one alternation frequency f A such that the at least one alternation frequency f ⁇ is within a frequency range containing the mechanical resonant frequency f R .
  • the energy supply means 21 may be designed to generate a supply signal SIG of variable frequency.
  • the supply signal SIG is shown schematically in Figs. 5 and 6.
  • the supply signal SIG contains a pulse-form signal with oppositely polarized amplitude values, which signal is repeated periodically during a time period TI, wherein the phases in which the signal occurs are interrupted by signal-free phases of duration T2.
  • the provision of signal-free phases in the supply signal SIG saves energy.
  • Fig. 6 shows a signal phase .of duration TI on an enlarged scale.
  • the supply signal SIG comprises a lower alternation frequency f A at the start ofthe time period TI than at the end ofthe time period TI .
  • the device 7 was so designed that the time period TI had a value of approximately 200 msec and the time period T2 had a value of 400 msec. Within the time period TI, a total of twenty-one (21) pulses of varying polarity is applied, as is clear from Fig. 6.
  • the alternation frequency f A ofthe supply signal SIG had a value of approximately 95 Hz at the start ofthe time period TI and a value of approximately 135 Hz at the end ofthe time period TI.
  • the alternation frequency f A is not kept constant for the magnetic fields acting on the permanent magnet 19 displaceable to-and- fro, but rather is changed, and in particular increased, in such a way that the alternation frequency f A always corresponds as precisely as possible to the resonant frequency f R ofthe oscillatory system 27 containing the permanent magnet 19 and the auxiliary magnets 23 and 24, whereby a "resonance step-up" is achieved, by means of which advantageously strong mechanical vibrations are obtained.
  • a substantially tubular coil holder 12 is again provided, to which a coil configuration 14 with two coil portions 15 and 16 is fitted.
  • a component 19 likewise in the form of a permanent magnet 19 is guided so as to be displaceable to-and-fro, specifically parallel to the straight movement path indicated by a double-headed arrow 20.
  • the permanent magnet 19 is hollow- cylindrical in this instance and therefore comprises a bore 30.
  • a bearing element 31 consisting of a disk-shaped foot part 32 and a sleeve-shaped top part 33 is inserted into the bore 30.
  • the bearing element 31 is guided so as to be displaceable to-and-fro on a bearing pin 34.
  • the bearing pin 34 is held fast in two end pieces 35 and 36, which end pieces 35 and 36 are in turn held fast in a coil holder 12.
  • counterforce means 22 are again provided which in the present case comprise a helical spring 37.
  • the helical spring 37 is connected firmly in the region of one end 38 with the disk-shaped foot part 32 ofthe bearing element 31 by means of an adhesive bond, such that the helical spring is consequently connected firmly with the permanent magnet 19 in the region of its end 38.
  • the helical spring 37 is connected firmly in the region of its other end 39 with the end piece 36 by means of an adhesive bond, which end piece 36 forms a stationary counter- bearing.
  • the helical spring 37 is in this case used to apply both a tensile force and a pressure force to the permanent magnet 19.
  • the permanent magnet 19 and the helical spring 37 are components of an oscillatory system 40, in which a mechanical resonant frequency f R is dependent on the mass ofthe permanent magnet 19 and on a counterforce characteristic value of the counterforce means 22, i.e. the helical spring 37, which counterforce characteristic value is formed in the present case by the spring constant ofthe helical spring 37.
  • the mechanical resonant frequency f R is substantially constant, because the spring constant ofthe helical spring 37 is constant, such that it is advantageous, in the case ofthe device 7 according to Fig. 7, for the coil configuration 14 to be supplied with a constant alternation frequency f A .
  • the coil configuration 14 to be supplied with a constant alternation frequency f A .
  • the advantages are in principle achieved which have already been mentioned above in connection with the device 7 according to Figs. 2 to 4.
  • the component 19 guided so as to be displaceable to-and-fro and capable of being caused to oscillate is guided displaceably along a straight movement path.
  • Such a component may however also be guided displaceably along an arcuate movement path.
  • a circular-cylindrical permanent magnet 19 is provided as the displaceable component 19.
  • such a permanent magnet may also exhibit a square or rectangular cross section, wherein a particularly flat construction may be achieved.
  • the coil configuration 14 comprises two coil portions 15 and 16.
  • Such a coil configuration may however also comprise only a single coil, which is fed in oppositely poled manner, or indeed more than two coil portions may be provided.

Abstract

A device (7) for producing mechanical vibrations comprises a component (19) displaceable under the action of a magnetic field and a coil configuration (14) surrounding the component (19) and energy supply means (21) for supplying energy to the coil configuration (14), wherein magnetic fields may be generated by means of the coil configuration (14) for displacing the component (19) to and fro and wherein counterforce means (22) are provided, which constantly exert counterforces on the component (19) and form an oscillatory system (27) with the component (19).

Description

Device for producing mechanical vibrations
The invention relates to a device for producing mechanical vibrations.
The invention further relates to a communications device having a device for producing mechanical vibrations.
A communications device, namely a portable telephone, in particular a cell phone, with a device for producing mechanical vibrations and consequently such a device for producing mechanical vibrations have been marketed in manifold variants and are also known for example from patent document US 5,379,032 A. In the arrangement known from patent document US 5,379,032 A, the device for producing mechanical vibrations is equipped with a magnet, which is arranged between two bumpers, preferably of rubber, and which is moved to and fro between these bumpers during operation and successively strikes against each ofthe two bumpers, wherein the successive impacting ofthe magnet against the bumpers produces the desired vibrations. The impact ofthe magnet against the bumpers produces relatively high mechanical loads, which is unfavorable with regard to maximum service life. In addition, the mechanical impact ofthe magnet on the bumper does not only result in the production of vibrations but also in the production of disturbing audible noise, which is not desirable, however.
It is an object ofthe invention to eliminate the above-described problems and to provide an improved device for producing mechanical vibrations and an improved communications device. To achieve the above-mentioned object, features according to the invention are provided for a device according to the invention, such that a device according to the invention may be characterized in the following way, namely:
A device for producing mechanical vibrations, which comprises at least one component displaceable under the action of a magnetic field, which component is mounted so as to be displaceable along a movement path, and which comprises a coil configuration surrounding the component, and which comprises energy supply means for supplying energy to the coil configuration, wherein magnetic fields may be produced by the energy supplied to the coil configuration by means of said coil configuration, which magnetic fields occur in alternating succession at at least one alternation frequency and act on the component in opposing directions and thereby effect to-and-fro displacement ofthe component, and which comprises counterforce means, which are designed and provided for the constant application of in each case a counterforce opposing displacement ofthe component under the action of the magnetic fields, wherein the component and the counterforce means are components of an oscillatory system, in which a mechanical resonant frequency is dependent on the mass of the component and on a counterforce characteristic value ofthe counterforce means.
To achieve the above-mentioned object, features according to the invention are provided for a communications device according to the invention, such that a communications device according to the invention may be characterized in the following way, namely:
A communications device having a device for producing mechanical vibrations, which comprises a coil configuration surrounding the component, and which comprises energy supply means for supplying energy to the coil configuration, wherein magnetic fields may be generated by the energy supplied to the coil configuration by means of said coil configuration, which magnetic fields occur in alternating succession at at least one alternation frequency and act on the component in opposing directions and thereby effect to-and-fro displacement ofthe component, and which comprises counterforce means, which are designed and provided for the constant application of in each case a counterforce opposing displacement ofthe component under the action ofthe magnetic fields, wherein the component and the counterforce means are components of an oscillatory system, in which a mechanical resonant frequency is dependent on the mass ofthe component and on a counterforce characteristic value ofthe counterforce means.
By providing the features according to the invention, a device for producing mechanical vibrations is provided in a structurally simple and consequently economic manner and additionally also in reliable manner, in which device virtually no disturbing audible noises occur and which makes it possible to manage with a relatively low mass component decisively influencing the intensity ofthe vibrations, such that a relatively small amount of space is needed, because this component may be displaced over a relatively large displacement path, i.e. a large travel, such that a good compromise may be achieved between the space required for such a device and the intensity ofthe mechanical vibrations achievable with such a device.
In the case of a device or a communications device respectively, according to the invention, it has proven particularly advantageous for the measures as claimed in claim 2 or claim 6 to be additionally provided. In this way, it is advantageously ensured that "resonance step-up" occurs during operation of such a device, which resonance step-up produces a particularly large travel for the displaceably mounted component while requiring the supply of a relatively small amount of energy, such that particular strong vibrations and a particularly high level of efficiency may be achieved. In the case of a device or a communications device respectively, according to the invention, the counterforce means are formed by two rubber cylinders or by two compression springs each in the form of cylindrical or conical helical springs, wherein both the rubber cylinders and the compression springs are each permanently connected on the one hand with the displaceably mounted component and on the other hand with one of two stationary counter-bearings and act in opposite directions on the displaceably mounted component. In the case of a device or a communications device respectively, according to the invention, however, it has proven advantageous for the features as claimed in claim 3 or claim 7 to be additionally provided. In this way, a structurally particularly compact embodiment is enabled, because it is possible to manage with a single helical spring. In the case of a device or a communications device respectively, according to the invention, the displaceably mounted component may comprise soft iron or a combination of at least one soft iron part and at least one permanent magnet. However, it has proven particularly advantageous for the component to take the form of a permanent magnet. In this way, a device for producing mechanical vibrations may be provided which is particularly efficient.
In the case of a device or a communication device according to the invention, wherein the component takes the form of a permanent magnet, it has proven particularly advantageous, however, for the features as claimed in claim 5 or claim 10 to be additionally provided. Such auxiliary magnets, provided as counterforce means, allow a particularly simple structural embodiment. Moreover, such auxiliary magnets are additionally advantageous when it comes to achieving a high level of efficiency.
The above-stated aspects ofthe invention and further aspects thereof emerge from the examples of embodiment described below and are explained with reference to these examples of embodiment.
The invention will be further described with reference to examples of embodiment shown in the drawings, to which, however, the invention is not restricted. Fig. 1 is an oblique view of a communications device, in this case a cell phone according to an example of embodiment ofthe invention, which comprises a device for producing mechanical vibrations according to a first example of embodiment ofthe invention. Fig. 2 is an oblique view ofthe device for producing mechanical vibrations in the cell phone according to Fig. 1.
Fig. 3 is a longitudinal section through the device for producing mechanical vibrations according to Fig. 2.
Fig. 4 is a schematic view ofthe device for producing mechanical vibrations according to Figs. 2 and 3 in the form of a block diagram.
Fig. 5 is a diagram showing an electrical supply signal occurring in the device according to Figs. 2 to 4.
Fig. 6 is a diagram showing part ofthe electrical supply signal occurring in the device according to Fig. 5 over a longer time scale. Fig. 7 shows a device for producing mechanical vibrations according to a second example of embodiment ofthe invention.
Fig. 1 shows a cell phone 1. The cell phone 1 comprises a housing 2, which is equipped on the housing front wall 3 with an acoustically transmissive cover 4, behind which are arranged a microphone, not shown, and a loudspeaker, not shown, and with a display means 5 and a keypad 6. A device 7, shown only schematically in Fig. 1, for producing mechanical vibrations is accommodated in the housing 2. The device 7 serves to produce vibrations in the event of an incoming call, which vibrations provide a tactile signal to a user ofthe cell phone 1 that a call may or should be taken. The device 7 is shown in more detail in Figs. 2 to 4.
The device 7 for producing mechanical vibrations comprises a housing 8, which comprises of two cup-like sleeves 9 and 10 of metal, in the present case of brass. Instead of brass, it is also possible to use non-magnetic or magnetic iron, wherein in the latter case a particularly good magnetic shielding is achieved. Each ofthe two sleeves 9 and 10 comprises four air passage holes 11 in the area of its closed end.
A coil holder 12 is accommodated in the housing 8, which coil holder 12 is tubular, in the form of a hollow cylinder, and from which a separating ring 13 projects in its central area. The coil holder 12 consists, together with the separating ring 13, of an electrically insulating material, namely plastic. The coil holder 12 is provided for holding a coil configuration 14. The coil configuration 14 comprises two coil portions 15 and 16, which are connected in parallel with one another, as may be seen from Fig. 4. The construction of the two coil portions 15 and 16, and in particular the winding direction of these two coil portions 15 and 16, is such that the magnetic fields generated at a particular time by means of the two coil portions 15 and 16 are in mutually opposing directions. In this way, in each case one coil portion has an attracting effect and the other coil portion a repelling effect on a component mounted displaceably inside the coil configuration 14, which component will be examined in more detail below. The coil configuration 14 thus forms drive means for this component. The two coil portions 15 and 16 are connected in electrically conductive manner with two terminal lugs 17 and 18. The terminal lugs 17 and 18 are of electrically conductive construction and are each connected in mechanically and electrically conductive manner with one ofthe sleeves 9 and 10, also consisting of electrically conductive material. In this way, it is ensured that the two sleeves 9 and 10 may be used as electrical terminal fittings for electrically conductive connection and serve for this purpose.
The device 7 additionally comprises a component 19 displaceable under the action of a magnetic field. In the case ofthe device 7, this component 19 takes the form of a permanent magnet 19, which is cylindrical in construction and which is mounted inside the hollow-cylindrical tubular coil holder 12 so as to be displaceable along a movement path which is indicated by a double-headed arrow 20 and in the present case is straight.
The device 7 further comprises energy supply means 21, as is clear from Fig. 4. The energy supply means 21 are provided for supplying energy in the form of an electrical supply signal SIG to the coil configuration 14 and formed by an electrical signal generator. In the present case, the energy supply means 21 are provided spatially separately from the housing 8 ofthe device 7 on a printed circuit board in the communications device 1. The energy supply means 21 may, however, also be connected directly with the housing 8. To this end, the energy supply means 21 are connected in electrically conductive manner with the two sleeves 9 and 10 and consequently with the two terminal lugs 17 and 18. Through the supply of energy to the coil configuration 14, magnetic fields may be generated by means of this coil configuration 14, which occur in alternating succession at at least one alternating frequency fλ and act in opposite directions on the permanent magnet 19 and thereby effect a to-and-fro displacement ofthe permanent magnet 19. In this way, it is ensured that the permanent magnet 19 effects a to-and-fro displacement motion parallel to the movement path 20 as a consequence of supplying the supply signal SIG to the coil configuration 14, which results in the production of mechamcal vibrations by means ofthe device 7. When effecting such a to-and-fro displacement motion, the permanent magnet 19 moves an air cushion in the area of each of its two ends 25 and 26, whereby air flows through the air passage holes 11, such that no undesirable air cushion damping arises for the permanent magnet 19. The device 7 additionally comprises counterforce means 22, which in the present case are designed and provided in a particularly advantageous manner for constant application of counterforce in each case opposing displacement ofthe permanent magnet 19 under the action ofthe magnetic fields. In the case ofthe device 7, the counterforce means 22 comprise two auxiliary magnets 23 and 24, of which one auxiliary magnet 23 is arranged opposite one end 25 ofthe displaceably mounted permanent magnet 19 and the other auxiliary magnet 24 is arranged opposite the other end 26 ofthe displaceably mounted permanent magnet 19. Magnetization ofthe permanent magnet 19 and the auxiliary magnets 23 and 24 and consequently the magnetic polarity ofthe permanent magnet 19 and the auxiliary magnets 23 and 24 are selected, as may be seen from Fig. 3, in such a way that each auxiliary magnet 23 or 24 constantly exerts a repulsive force on the displaceably mounted permanent magnet 19. The auxiliary magnets 23 and 24 are each held firmly in the relevant sleeve 9 and 10 ofthe housing 8 by means of an adhesive bond.
The device 7 is so constructed that the permanent magnet 19 and the counterforce means 22, i.e. the two auxiliary magnets 23 and 24, are components of an oscillatory system 27, in which a mechanical resonant frequency fR is dependent on the mass ofthe permanent magnet 19 and on a counterforce characteristic value ofthe counterforce means 22, in the present case therefore on the repulsive magnetic force of each ofthe auxiliary magnets 23 and 24. This resonant frequency fR represents a desired frequency, at which the to-and-fro displacement motion ofthe permanent magnet 19 should occur. In the present case, this mechanical resonant frequency fR is not constant, because the mechanical resonant frequency fR is dependent on the travel ofthe permanent magnet 19, in such a way that, in the case of relatively small travel ofthe permanent magnet 19, a relatively small counterforce is exerted on the permanent magnet 19 by the auxiliary magnets 23 and 24, whereas, in the case of relatively large travel ofthe permanent magnet 19, the auxiliary magnets 23 and 24 exert a relatively large counterforce on the permanent magnet 19, wherein the profile ofthe increase from small counterforce to large counterforce is non-linear, and progressive. When the device 7 is brought into service, the permanent magnet 19 initially effects a relatively small travel, relatively small counterforces therefore acting on the permanent magnet 19. As the operating time increases, the travel ofthe permanent magnet 19 increases, which also leads to progressively increasing counterforces. This has the effect that, in the case ofthe device 7, when said device 7 is first brought into service a relatively low resonant frequency f ofthe oscillatory system 27 is produced and that, as the operating time increases, the mechanical resonant frequency f increases. To take account ofthe above-described situation, in the case ofthe device 7 the energy supply means 21 are advantageously so designed that the supply of energy to the coil configuration 14 produces an alternately successive occurrence ofthe magnetic fields acting on the permanent magnet 19 with at least one alternation frequency fA such that the at least one alternation frequency fΑ is within a frequency range containing the mechanical resonant frequency fR. In other words, the energy supply means 21 may be designed to generate a supply signal SIG of variable frequency. The supply signal SIG is shown schematically in Figs. 5 and 6. As is clear from Figs. 5 and 6, the supply signal SIG contains a pulse-form signal with oppositely polarized amplitude values, which signal is repeated periodically during a time period TI, wherein the phases in which the signal occurs are interrupted by signal-free phases of duration T2. The provision of signal-free phases in the supply signal SIG saves energy. Fig. 6 shows a signal phase .of duration TI on an enlarged scale. As is clear from Fig. 6, the supply signal SIG comprises a lower alternation frequency fA at the start ofthe time period TI than at the end ofthe time period TI .
In a device 7 produced for experimental purposes, the device 7 was so designed that the time period TI had a value of approximately 200 msec and the time period T2 had a value of 400 msec. Within the time period TI, a total of twenty-one (21) pulses of varying polarity is applied, as is clear from Fig. 6. The alternation frequency fA ofthe supply signal SIG had a value of approximately 95 Hz at the start ofthe time period TI and a value of approximately 135 Hz at the end ofthe time period TI. In the case ofthe cell phone 1 and its device 7 for producing mechanical vibrations, it is particularly advantageously ensured that the mechanical vibrations are produced in a manner which causes the least possible mechanical stress, and consequently in an aging-resistant, reliable and interference signal-free manner and that very easily felt, perceptible mechanical vibrations are produced, because the alternation frequency fA is not kept constant for the magnetic fields acting on the permanent magnet 19 displaceable to-and- fro, but rather is changed, and in particular increased, in such a way that the alternation frequency fA always corresponds as precisely as possible to the resonant frequency fR ofthe oscillatory system 27 containing the permanent magnet 19 and the auxiliary magnets 23 and 24, whereby a "resonance step-up" is achieved, by means of which advantageously strong mechanical vibrations are obtained.
In the case ofthe device 7 illustrated in Fig. 7 for producing mechanical vibrations, a substantially tubular coil holder 12 is again provided, to which a coil configuration 14 with two coil portions 15 and 16 is fitted.
In the coil holder 12, a component 19 likewise in the form of a permanent magnet 19 is guided so as to be displaceable to-and-fro, specifically parallel to the straight movement path indicated by a double-headed arrow 20. The permanent magnet 19 is hollow- cylindrical in this instance and therefore comprises a bore 30. A bearing element 31 consisting of a disk-shaped foot part 32 and a sleeve-shaped top part 33 is inserted into the bore 30. The bearing element 31 is guided so as to be displaceable to-and-fro on a bearing pin 34. The bearing pin 34 is held fast in two end pieces 35 and 36, which end pieces 35 and 36 are in turn held fast in a coil holder 12.
In the case of a device 7 according to Fig. 7, counterforce means 22 are again provided which in the present case comprise a helical spring 37. The helical spring 37 is connected firmly in the region of one end 38 with the disk-shaped foot part 32 ofthe bearing element 31 by means of an adhesive bond, such that the helical spring is consequently connected firmly with the permanent magnet 19 in the region of its end 38. On the other hand, the helical spring 37 is connected firmly in the region of its other end 39 with the end piece 36 by means of an adhesive bond, which end piece 36 forms a stationary counter- bearing. The helical spring 37 is in this case used to apply both a tensile force and a pressure force to the permanent magnet 19.
In this case, the permanent magnet 19 and the helical spring 37 are components of an oscillatory system 40, in which a mechanical resonant frequency fR is dependent on the mass ofthe permanent magnet 19 and on a counterforce characteristic value of the counterforce means 22, i.e. the helical spring 37, which counterforce characteristic value is formed in the present case by the spring constant ofthe helical spring 37. In the case ofthe device 7 according to Fig. 7, the mechanical resonant frequency fR is substantially constant, because the spring constant ofthe helical spring 37 is constant, such that it is advantageous, in the case ofthe device 7 according to Fig. 7, for the coil configuration 14 to be supplied with a constant alternation frequency fA. Also in the case ofthe device 7 according to Fig. 7, the advantages are in principle achieved which have already been mentioned above in connection with the device 7 according to Figs. 2 to 4. In the case ofthe two above-described devices 7 for producing mechanical vibrations, the component 19 guided so as to be displaceable to-and-fro and capable of being caused to oscillate is guided displaceably along a straight movement path. Such a component may however also be guided displaceably along an arcuate movement path. In the case ofthe above-described devices 7 for producing mechanical vibrations, a circular-cylindrical permanent magnet 19 is provided as the displaceable component 19. However, such a permanent magnet may also exhibit a square or rectangular cross section, wherein a particularly flat construction may be achieved.
In the case ofthe two above-described devices 7 for producing mechamcal vibrations, the coil configuration 14 comprises two coil portions 15 and 16. Such a coil configuration may however also comprise only a single coil, which is fed in oppositely poled manner, or indeed more than two coil portions may be provided.

Claims

CLAIMS:
1. A device (7) for producing mechanical vibrations, which comprises at least one component (19) displaceable under the action of a magnetic field, which component (19) is mounted so as to be displaceable along a movement path (20), and which comprises a coil configuration (14) surrounding the component (19), and which comprises energy supply means (21) for supplying energy to the coil configuration (14), wherein magnetic fields may be generated by the energy supplied to the coil configuration (14) by means of said coil configuration (14), which magnetic fields occur in alternating succession at at least one alternation frequency (fA) and act on the component (19) in opposing directions and thereby effect to-and-fro displacement ofthe component (19), and which comprises counterforce means (22), which are designed and provided for the constant application of in each case a counterforce opposing displacement ofthe component (19) under the action ofthe magnetic fields, wherein the component (19) and the counterforce means (22) are components of an oscillatory system (27; 40), in which a mechanical resonant frequency (fR) is dependent on the mass ofthe component and on a counterforce characteristic value ofthe counterforce means (22).
2. A device (7) as claimed in claim 1 , wherein the energy supply means (21) are so designed that the supply of energy to the coil configuration (14) produces alternately successive occurrence ofthe magnetic fields acting on the permanent magnet (19) at at least one alternation frequency (fA) lying within a frequency range containing the mechanical resonant frequency (fR).
3. A device (7) as claimed in claim 1, wherein the counterforce means (22) comprise a helical spring (37), which is firmly connected on the one hand with the component (19) and on the other hand with a stationary counter-bearing (36) and which is used to apply both a tensile force and a pressure force to the component (19).
4. A device (7) as claimed in claim 1, wherein the component (19) takes the form of a permanent magnet (19).
5. A device (7) as claimed in claim 4, wherein the counterforce means (22) comprise two auxiliary magnets (23, 24), of which one auxiliary magnet (23) is arranged opposite one end (25) ofthe displaceably mounted permanent magnet (19) and the other auxiliary magnet (24) is arranged opposite the other end (26) ofthe displaceably mounted permanent magnet (19), and of which each auxiliary magnet (23, 24) constantly exerts a repulsive force on the displaceably mounted permanent magnet (19).
6. A communications device (1) having a device (7) for producing mechanical vibrations, which comprises at least one component (19) displaceable under the action of a magnetic field, which component (19) is mounted so as to be displaceable along a movement path (20), and which comprises a coil configuration (14) surrounding the component (19), and which comprises energy supply means (21) for supplying energy to the coil configuration (14), wherein magnetic fields may be generated by the energy supplied to the coil configuration (14) by means of said coil configuration (14), which magnetic fields occur in alternating succession at at least one alternation frequency (fA) and act on the component
(19) in opposing directions and thereby effect to-and-fro displacement of the component (19), and which comprises counterforce means (22), which are designed and provided for the constant application of in each case a counterforce opposing displacement ofthe component (19) under the action ofthe magnetic fields, wherein the component (19) and the counterforce means (22) are components of an oscillatory system (27; 40), in which a mechanical resonant frequency (fR) is dependent on the mass ofthe component and on a counterforce characteristic value of the counterforce means (22).
7. A communications device (1) as claimed in claim 6, wherein the energy supply means (21) are so designed that the supply of energy to the coil configuration (14) produces alternately successive occurrence ofthe magnetic fields acting on the permanent magnet (19) at at least one alternation frequency (fA) lying within a frequency range containing the mechanical resonant frequency (f ).
8. A communications device (1) as claimed in claim 6, wherein the counterforce means (22) comprise a helical spring (37), which is firmly connected on the one hand with the component (19) and on the other hand with a stationary counter-bearing (36) and which is used to apply both a tensile force and a pressure force to the component (19).
9. A communications device (1) as claimed in claim 6, wherein the component (19) takes the form of a permanent magnet (19).
10. A communications device (1) as claimed in claim 9, wherein the counterforce means (22) comprise two auxiliary magnets (23, 24), of which one auxiliary magnet (23) is arranged opposite one end (25) ofthe displaceably mounted permanent magnet (19) and the other auxiliary magnet (24) is arranged opposite the other end (26) ofthe displaceably mounted permanent magnet (19), and of which each auxiliary magnet (23, 24) constantly exerts a repulsive force on the displaceably mounted permanent magnet (19).
PCT/IB2003/000179 2002-01-30 2003-01-23 Device for producing mechanical vibrations WO2003065552A2 (en)

Applications Claiming Priority (2)

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EP02100085.6 2002-01-30
EP02100085 2002-01-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1834127A2 (en) * 2005-01-04 2007-09-19 Coactive Drive Corporation Vibration device

Citations (3)

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Publication number Priority date Publication date Assignee Title
GB2155586A (en) * 1984-03-08 1985-09-25 Fmc Corp Electromagnetic vibratory exciter
US5379032A (en) * 1992-11-02 1995-01-03 Motorola, Inc. Impulse transducer enunciator
WO1998019383A1 (en) * 1996-10-30 1998-05-07 Omron Corporation Vibration generator

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2155586A (en) * 1984-03-08 1985-09-25 Fmc Corp Electromagnetic vibratory exciter
US5379032A (en) * 1992-11-02 1995-01-03 Motorola, Inc. Impulse transducer enunciator
WO1998019383A1 (en) * 1996-10-30 1998-05-07 Omron Corporation Vibration generator

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1834127A2 (en) * 2005-01-04 2007-09-19 Coactive Drive Corporation Vibration device
EP1834127A4 (en) * 2005-01-04 2012-08-15 Coactive Drive Corp Vibration device

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