Electronically controlled scent producing element, a method of electronically controlled scent production and an ultrasonic micro-plug based nebulizer

213911/4 0Ό2 oomi •ίηορ'ζχ Ίραη nn ίιϊ"1? nirvy ,υηΰρ^χ ipan nn nx"1? non ‘pip-mn'iix ηιηοω-ηρ'η

AN ELECTRONICALLY CONTROLLED SCENT PRODUCING ELEMENT, A METHOD OF ELECTRONICALLY CONTROLLED SCENT PRODUCTION AND AN ULTRASONIC MICRO-PLUG BASED NEBULIZER 213911/4

TECHNICAL FIELD

[0001] The invention relates generally to the field of electronically controlled scent production, and more particularly to an apparatus exhibiting an ultrasonic micro-plug unit.

BACKGROUND

[0002] Video games, particularly computer based games and game stations, have become extremely popular. The combination of visual and audio stimulation has succeeded in capturing a significant portion of people’s leisure time. Various games have been developed, with associated hardware, that further involve the sense of touch, by allowing for varying input instruments. In one example, a musical instrument such as a mock guitar, is utilized as a game input, thus involving the sense of touch.

[0003] Games have been developed providing for a virtual reality world, again based on stimulating various user senses. However, to date, the remaining senses, namely smell and taste have not been stimulated.

[0004] U.S. Patent S/N 6,656,041 issued December 2, 2003 to Kaminkow et al, provides for a method and apparatus for emulating a storm as part of a gaming device, preferably as a topper unit including a blower to create an air stream, an illumination source to emulate lightning, and a sound card arranged to transmit thunder. Thus, the sense of touch is stimulated, in addition to the sense of hearing and seeing.

[0005] U.S. Patent Application Publication S/N 2008/0043204 published February 21, 2008 to Guo, is addressed to a digital scent movie projector with sound channels. Scent making devices release a scent into a cinema, thereby providing for film arts to provide a sense of sight, hearing and smell as part of movie.

[0006] A movie proceeds along a predetermined script, which does not allow for user interaction. Thus, the scent to be provided by Guo, are predetermined, and are not subject to 1 213911/2 change by a user action. Additionally, scent provided by Guo is arranged for releasing scent into a large space, which is not appropriate for an individual playing a computer game.

[0008] An additional problem with many prior art solutions is residual scent; particularly the scent continues to linger for a relatively long period after the desired 5 emission. Residual scent is particularly problematic in the case of individual computer gamers, which often play in undisturbed spaces, where scents easily linger. In particular, any physical element which has been contacted by a concentration of scent molecules continues to exude the scent. The residual scent further contaminates additional scents, which may need to be rapidly emitted in line with progress of the game. 10 [0009] World Intellectual Property Organization publication WO 02/32470 A1 published 25 April 2002 to SENEIT, Inc. is addressed to an apparatus for emitting an odor. Unfortunately, the apparatus as described suffers greatly from the aforementioned residual scent, as scent molecules are deposited along the enclosed spaces of scented air travel.

[0010] Various nebulizer schemes are known to the prior art, including placing a 15 vibrating fine mesh in contact with a liquid to be nebulized. The mesh typically is arranged to be sufficiently fine so as to block any flow of the liquid and is vibrated, typically at ultrasonic frequencies, thereby atomizing the liquid. Unfortunately, such a scheme suffers from certain drawbacks, such as spontaneous scent leakage since there is no means to prevent spontaneous release of volatile vapors via the mesh opening. Furthermore any molecules 20 adhering to the mesh walls may be released without further vibration, further leading to residual scents. Additionally, there is a tendency for the fine mesh to become blocked by the aromatic molecules adhering to the mesh openings. Furthermore, the mesh aperture which is fixed in size is designed for a particular molecule size and viscosity, and a particular fixed mesh based nebulizer can not be used for a plurality of liquids having a range of viscosity 25 without changing the fixed mesh.

[0011] U.S. Patent Application Publication S/N 2007/0189919 published August 17, 2007 to Prince et al, is addressed to a method for cleaning a medicament from a portion of a nebulizer. In particular, the above mentioned application is addressed to the problem of prior art mesh based nebulizers becoming occluded. 30 [0012] Thus, there is a need for an electronically controlled nebulizer addressing the issue of residual scent and arranged to avoid occlusion. 2 WO 2010/079485 PCT/IL2010/000016

SUMMARY

[0013] Accordingly, it is a principal object of the present invention to overcome at least some of the disadvantages of prior art. This is accomplished in certain embodiments by providing an electronically controlled scent producing element comprising: a plate exhibiting 5 a plurality of perforations extending from a first face of the plate to a second face of the plate opposing the first face; a volatile scent liquid in physical contact with the first face of the plate; a plurality of micro-plugs juxtaposed with the plate, each of the plurality of microplugs extending longitudinally from a base end to a tip end, and arranged to mate with one of the plurality of perforations; a translation mechanism in communication with one of the plate 10 and the plurality of micro-plugs, the translation mechanism arranged to translate the plurality of micro-plugs in relation to the plate from a first position wherein each of the plurality of micro-plugs is seated flush within a respective one of the plurality of the perforations to a second position wherein each of the plurality of micro-plugs is at least partially removed from a wall of the respective one of the plurality of perforations; and a vibrator in 15 communication with at least one of the plate and the plurality of micro-plugs.

[0014] In one further embodiment the plurality of micro-plugs seated in the first position prevents the flow of the volatile scent liquid from the first face of the plate to the second face of the plate. In another further embodiment each of the plurality of micro-plugs exhibits a generally conically shaped taper towards the tip end. In one yet further 20 embodiment each of the plurality of perforations are generally conically shaped, the base of the generally conically shaped plurality of perforations facing tire base end of the plurality of micro-plugs. In another yet further embodiment each of the plurality of perforations exhibits a diameter of about 30 microns at the second face.

[0015] In one further embodiment the plurality of micro-plugs exhibits a shape 25 arranged to form a ring shaped droplet towards the tip ends when the plurality of micro-plugs in relation to the plate is in the second position. In another further embodiment the translation mechanism and the vibrator are constituted of a single piezoelectric element.

[0016] In one further embodiment the vibrator is only in communication with the plurality of micro-plugs. In one yet further embodiment, the electronically controlled scent 30 producing element further comprises a driver in communication with the translation mechanism and the vibrator, the driver arranged to translate, via the translation mechanism, the plurality of micro-plugs to the first position and vibrate the vibrator while the plurality of 3 WO 2010/079485 PCT/IL2010/000016 micro-plugs are in the first position, thereby ultrasonically cleaning the second face of the plate and the tip ends of the plurality of micro-plugs. (0017] In one further embodiment the electronically controlled scent producing element further comprises a driver in communication with the translation mechanism and the 5 vibrator, the driver arranged to translate, via the translation mechanism, the plurality of micro-plugs to the second position and vibrate the vibrator while the plurality of micro-plugs are in the second position, thereby atomizing the volatile scent liquid. In one yet further embodiment the driver is further arranged to detect an electrical characteristic of the vibrator, and in the event the electrical characteristic meets a predetermined value, output a signal 10 indicative of the absence of the volatile scent liquid.

[0018] Independently the embodiments further provide for a method of electronically controlled scent production, the method comprising: providing a plate exhibiting a plurality of perforations extending from a first face of the provided plate to a second face of the provided plate opposing the first face; providing a volatile scent liquid in physical contact 15 with the first face of the provided plate; providing a plurality of micro-plugs juxtaposed with the provided plate, each of the provided plurality of micro-plugs extending longitudinally from a base end to a tip end, and arranged to mate with one of the plurality of perforations; translating the provided plurality of micro-plugs in relation to the provided plate from a first position wherein each of the provided plurality of micro-plugs is seated flush within a 20 respective one of the plurality of perforations to a second position wherein each of the provided plurality of micro-plugs is at least partially removed from a wall of the respective one of the plurality of perforations; and vibrating at least one of the provided plate and the provided plurality of micro-plugs with ultrasonic energy to thereby produce a scent.

[0019] In one further embodiment the provided plurality of micro-plugs seated in the 25 first position prevents the flow of the provided volatile scent liquid from the first face of the provided plate to the second face of the provided plate. In another further embodiment each of the provided plurality of micro-plugs exhibits a generally conically shaped taper towards the tip end. In one yet further embodiment each of the plurality of perforations are generally conically shaped, the base of the provided generally conically shaped plurality of perforations 30 facing the base end of the provided plurality of micro-plugs. In yet another further embodiment each of the plurality of perforations exhibits a diameter of about 30 microns at the second face. 4 WO 2010/079485 PCT/IL2010/000016 [0020] In one further embodiment the translating and the vibrating are performed by a single piezoelectric element. In another further embodiment, the vibrating is only of the provided plurality of micro-plugs. In one yet further embodiment, the method further comprises ultrasonically cleaning the second face of the plate and the tip ends of the provided 5 plurality of micro-plugs by translating the provided plurality of micro-plugs to the first position and vibrating the provided plurality of micro-plugs in the first position.

[0021] In one further embodiment the vibrating is accomplished by a vibrator, and further comprising: automatically detecting an electrical characteristic of the vibrator; and in the event the electrical characteristic meets a predetermined value, outputting a signal 10 indicative of the absence of the provided volatile scent liquid. In one yet further embodiment the vibrating is at a frequency associated with the natural resonant frequency of the vibrator and the vibrated at least one of the provided plate and the provided plurality of micro-plugs. In one further embodiment, the method further comprises forming ring shaped droplets towards the tip ends when the provided plurality of micro-plugs in relation to the provided 15 plate is translated to the second position.

[0022] Independently the embodiments further provide for an ultrasonic micro-micro- plug based nebulizer comprising: a plate exhibiting a plurality of perforations extending from a first face of the plate to a second face of the plate opposing the first face; a plurality of micro-plugs juxtaposed with the plate, each of the plurality of micro-plugs extending 20 longitudinally from a base end to a tip end, and arranged to mate with one of the plurality of perforations; a translation mechanism in communication with one of the plate and the plurality of micro-plugs, the translation mechanism arranged to translate the plurality of micro-plugs in relation to the plate from a first position wherein each of the plurality of micro-plugs is seated flush within a respective one of the plurality of the perforations to a 25 second position wherein each of the plurality of micro-plugs is at least partially removed from a wall of the respective one of the plurality of perforations; and a vibrator in communication with at least one of the plate and the plurality of micro-plugs. Preferably, a liquid is placed in physical contact with the first face of the plate.

[0023] Additional features and advantages of the invention will become apparent 30 from the following drawings and description. 5 1 »

I WO 2010/079485 PCT/IL2010/000016 BRIEF DESCRIPTION OF THE DRAWINGS [0024] For a better understanding of various embodiments of the invention and to show how the same may be carried into effect, reference will now be made, purely by way of example, to the accompanying drawings in which like numerals designate corresponding 5 elements or sections throughout.

[0025] With specific reference now to the drawings in detail, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of the preferred embodiments of the present invention only, and are presented in the cause of providing what is believed to be the most useful and readily understood description of the 10 principles and conceptual aspects of the invention. In this regard, no attempt is made to show structural details of the invention in more detail than is necessary for a fundamental understanding of the invention, the description taken with the drawings making apparent to those skilled in the art how the several forms of the invention may be embodied in practice. In the accompanying drawings: 15 [0026] FIGs. 1A - 1J illustrate various views of an exemplary embodiment of an electronically controlled scent producing element comprising a plurality of micro-plugs and a perforated plate juxtaposed with the plurality of micro-plugs, in accordance with an exemplary embodiment; [0027] FIGs. 2A and 2B illustrate a first alternative embodiment for the scent 20 producing element of FIG. ΪΑ, in which a separate translation mechanism and vibrator are supplied in a stacked manner, in accordance with an exemplary embodiment; [0028] FIGs. 3A - 3C illustrate a second alternative embodiment for the scent producing element of FIG. 1 A, in which a separate translation mechanism and vibrator are supplied in disparate locations, in accordance with an exemplary embodiment; 25 [0029] FIGs. 4A - 4C illustrate a third alternative embodiment for the scent producing element of FIG. 1 A, in which a separate translation mechanism and vibrator are supplied, the vibrator arranged to vibrate only the perforated plate, in accordance with an exemplary embodiment; [0030] FIG. 5 illustrates a high level schematic diagram of a driving circuit useable 30 with scent producing element 800 of any of FIGs. 1A - 4C; and [0031] FIG. 6 illustrates a high level flow chart of the operation of control circuit of FIG. 5, in accordance with an exemplary embodiment. 6 WO 2010/079485 PCT/IL2010/000016

DETAILED DESCRIPTION

[0032] Before explaining at least one embodiment in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangement of the components set forth in the following description or illustrated in the 5 drawings. The invention is applicable to other embodiments or of being practiced or carried out in various ways. Also, it is to be understood that the phraseology and terminology employed herein is for the purpose of description and should not be regarded as limiting. [0033] FIGS. 1A - 1J illustrate various exploded views of an exemplary embodiment of an electronically controlled scent producing element 800, the views being described taken 30 together. Electronically controlled scent producing element 800 may be used in place of electronically controlled scent producing element 130, or independently, without exceeding the scope. Electronically controlled scent producing element 800 may be further be used to nebulize, or atomize, any liquid, such as a medicament, without exceeding the scope. In particular, FIG. 1A illustrates an isometric view of electronically controlled scent producing 15 element 800; FIG. IB illustrates a more detailed view of a top portion of electronically controlled scent producing element 800 of FIG. 1A; FIG. 1C illustrates an isometric cutaway view of electronically controlled scent producing element 800; FIG. ID illustrates a more detailed view of the top portion of FIG. IB; FIG. IE illustrates a first exploded view of electronically controlled scent producing element 800; FIG. IF illustrates a second exploded 20 view of electronically controlled scent producing element 800; FIG. 1G illustrates a first position for certain portions of electronically controlled scent producing element 800; FIG. 1H illustrates a second position for certain portions of electronically controlled scent producing element 800; FIG. 31 illustrates a highly detailed view of the perforations and plugs of electronically controlled scent producing element 800; and FIG. 1J illustrates the 25 resultant shape of scent producing liquid droplets, in accordance with an exemplary embodiment.

[0034] Electronically controlled scent producing element 800 comprises: a container 805; a lower reservoir 810; a unidirectional flow membrane 815; an upper reservoir 816; a sealing ring 818; a plug base 820; a first electrode 830; a piezoelectric element 840; a second 30 electrode 850; and a plate 860. Plate 860 exhibits a plurality of perforations 880 extending from first face 882 to second face 884. Plug base 820 exhibits a plurality of pass through channels 890, and a plurality of micro-plugs 870 extending longitudinally from a base portion attached to plug base 820 to a tip end 875, with each plug arranged to mate with a respective 7 WO 2010/079485 PCT/1L2010/000016 one of perforations 880. Preferably, a portion of each plug 870, and particularly the portion extending through perforations 880 are conically shaped with an apex extending away from plug base 820. Perforations 880 are preferably similarly conically shaped, such that when plug base 820 is brought to its closest position in relation to first face 882, micro-plugs 870 are seated flush against the inner walls of the respective perforation 880. Preferably, perforations 880 exhibit a diameter of about 30 microns at first face 882, matching the diameter of micro-plugs 870 when completely seated therein. The space created towards second face 884 when each micro-plug 870 is separated from the respective perforation 880 is denoted space 895, and a ring shaped droplet 897 of volatile scent liquid is formed by the shape of plug 870 in proximity of second face 884.

[0035] Sealing ring 818 is provided of a compliant material so as to form a seal against liquid, in particular a volatile scent liquid. Unidirectional flow membrane 815, in cooperation with container 805, forms lower reservoir 810. Unidirectional flow membrane 815, in cooperation with plug base 820, forms upper reservoir 816. In particular, unidirectional flow membrane 815 defines the top of lower reservoir 810 and the bottom of upper reservoir 816. The top of upper reservoir 816 is defined by one end of plug base 820 in particular the side not exhibiting micro-plugs 870. First electrode 830 is placed at one side of piezoelectric element 840, in electrical contact therewith, and in physical contact with plug base 820, in particular the side of plug base 820 exhibiting micro-plugs 870. Piezoelectric element 840 is preferably a ring shaped element, and second electrode 850 is placed on the second side of piezoelectric element 840, in electrical contact therewith. Plate 860 is placed in physical contact with second electrode 850, and in one embodiment is secured thereto with an adhesive to prevent the escape of plate 860. Face 882 of plate 860 is juxtaposed with plug base 820 such that each micro-plug 870 extends into a matching perforation 880. The combination of micro-plugs 870 and perforations 880 forms an ultrasonic micro plug unit [0036] In a first mode of operation, as illustrated in FIGS. 1G and 1H, a low frequency electric power is applied to piezoelectric element 840, and in response piezoelectric element 840 expands, separating plug base 820 from plate 860 shown in FIG. 1G as being in closest proximity, to a separated position as illustrated in FIG. 1H - II After expansion, an additional high frequency electrical power is further supplied, superimposed on the low frequency electrical power, vibrating piezoelectric element 840. In an exemplary embodiment the high frequency electrical power exhibits a frequency range of 150 - 200 kHz, however this is not meant to be limiting in any way. The preferred conical shape of 8 WO 2010/079485 PCT/IL2010/000016 micro-plugs 870 function to focus the acoustical energy supplied by piezoelectric element 840 towards tip ends 875, thereby atomizing any volatile scent liquid in contact with microplugs 870 and within perforations 880 so as to be scented distal of second face 884.

I

Advantageously, the conical shape of micro-plugs 870 forms ring shaped droplet 897, which requires a reduced amount of energy to atomize, or nebulize, when compared to a standard droplet of volatile scent liquid. Advantageously, the amount of separation between plug base 820 and plate 860 may be varied responsive to the viscosity of the liquid being atomized or nebulized thus varying the dimensions of the ring shaped aperture produced by micro-plugs 870 in cooperation with perforations 880, and thus a single ultrasonic micro-plug unit may be utilized for liquids having a wide range of viscosity without being blocked.

[0037] In a second mode of operation, electrical power is disconnected from piezoelectric element 840, and in response piezoelectric element 840 contracts bringing plug base 820 into closer proximity with plate 860 until micro-plugs 870 are seated flush within perforations 880, i.e. a closed position, thus sealing the volatile scent liquid from second face 884, and preventing any further scent from being experienced distal of second face 884. The particular conical shape mentioned above results in a complete seal, which is preferred for use with a volatile scent liquid, however this is not meant to be limiting in any way. In another embodiment a complete seal is not required in the second mode, but only that the plurality of micro-plugs travel sufficiently through perforations 880 to ensure that no residual liquid remains within perforations 880 to prevent occlusion.

[0038] In a third mode of operation, while micro-plugs 870 are seated flush within perforations 880, a medium to high frequency electrical power, in one non-limiting embodiment being from 40 kHz to 400 kHz, is supplied to piezoelectric element 840, thus vibrating the combination of plate 860 and micro-plugs 870. Any residual volatile scent on tip ends 875 and second face 884 is promptly atomized, or nebulized, and removed thus completely ceasing scent production.

[0039] FIGs. 2A and 2B illustrate a first alternative embodiment for electronically controlled scent producing element 800, in which a plurality of elements 840 are supplied in a stacked manner, a first element being a translation mechanism 840A and a second element being a vibrator 840B. In particular, a pair of piezoelectric elements is provided, each provided with a pair of electrodes, and physically stacked. Translation mechanism 840A translates plug base 820 in relation to plate 860 between a first closed position, as shown in FIG. 2A, wherein plug base 820 is proximate plate 860 to a second open position as shown in 9 WO 2010/079485 PCT/IL2010/000016 FIG. 2B, wherein plug base 820 is removed from plate 860. Vibrator 840B operates as described above to vibrate plug base 820 and plate 860 thereby controllabiy producing a scent. The combination of micro-plugs 870 and perforations 880 forms an ultrasonic microplug unit.

[0040] FIGs. 3A - 3C illustrate a second alternative embodiment for electronically controlled scent producing element 800, in which a plurality of elements 840 are supplied, a first element being a translation mechanism 840A and a second element being a vibrator 840B, in which plate 860 is fixed, and vibration energy is supplied only to plug base 820, FIG. 3 A illustrates a cut away view of the second alternative embodiment, FIG. 3B illustrates the second alternative embodiment in a closed position wherein plug base 820 is proximate plate 860, and FIG. 3C illustrates the second alternative embodiment in an open position wherein plug base 820 is removed from plate 860.

[0041] In particular, plurality of elements 840 is a pair of piezoelectric elements, each provided with a pair of electrodes. Translation mechanism 840A is in communication with plate 860 and is seated against a rim of the container. Vibrator 840B is in communication with plug base 820 and mechanically isolated from plate 860. The combination of microplugs 870 and perforations 880 forms an ultrasonic micro-plug unit.

[0042] In a first mode of operation a low frequency electric power is applied to translation mechanism 840A, and in response translation mechanism 840A expands, separating plate 860 from base plate 820, particular by separating plate 860 from the rim of container 805. A high frequency electrical power is further supplied to vibrator 840B thus vibrating micro-plugs 870. Micro-plugs 870, exhibiting the preferred conical shape, act as a micro-acoustic lens, breaking the volatile second liquid received via pass through channels 890 into micro-drops, thus atomizing any volatile scent liquid in contact with micro-plugs 870 and within perforations 880 so as to be scented distal of second face 884. Advantageously, as described above in relation to FIGs. II - I J, the shape of micro-plugs 870 are arranged to form ring shaped droplet 897, which requires a reduced amount of energy to atomize, or nebulize, when compared to a standard droplet of volatile scent liquid. In an exemplary embodiment the high frequency electrical power exhibits a frequency range of 150 - 200 kHz, however this is not meant to be limiting in any way. Advantageously, the amount of separation between plug base 820 and plate 860 may be varied responsive to the viscosity of the liquid being atomized or nebulized thus varying the dimensions of the ring shaped aperture produced by micro-plugs 870 in cooperation with perforations 880, and thus a single 10 WO 2010/079485 PCT/1L2010/000016 ultrasonic micro-plug unit may be utilized for liquids having a wide range of viscosity without being blocked.

[0043] In a second mode of operation, electrical power is disconnected from translation mechanism 840A, and in response translation mechanism 840A contracts bringing 5 plate 860 into closer proximity with plug base 820 until micro-plugs 870 are seated flush within perforations 880, i.e. a closed position, thus sealing the volatile scent liquid from second face 884, and preventing any further scent from being experienced distal of second face 884. The particular conical shape mentioned above results in a complete seal, which is preferred for use with a volatile scent liquid, however this is not meant to be limiting in any 10 way. In another embodiment a complete seal is not required in the second mode, but only that the plurality of micro-plugs travel sufficiently through perforations 880 to ensure that no residual liquid remains within perforations 880 to prevent occlusion.

[0044] FIGs. 4A - 4C illustrate a third alternative embodiment for electronically controlled scent producing element 800, in which a plurality of elements 840 are supplied, a 15 first element being a translation mechanism 840A and a second element being a vibrator 840B, in which vibration energy is supplied only to plate 820 via a member 910 passing through unidirectional flow membrane 815. FIG. 4A illustrates a cut away view of the third alternative embodiment, FIG. 4B illustrates the third alternative embodiment in a closed position wherein plug base 820 is proximate plate 860, and FIG. 4C illustrates the third 20 alternative embodiment in an open position wherein the plate 860 is moved from the plug base 820. A sealing ring 818 is further supplied providing a seal between plate 860 and a flange 915 connected to the walls of electronically controlled scent producing element 800, [0045] In particular, plurality of elements 840, particularly translation mechanism 840A and vibrator 840B, is a pair of piezoelectric elements, each provided with a pair of 25 electrodes. Translation mechanism 840A and vibrator 840B are each in contact with plate 860 via member 910. Vibrator 840B is mechanically isolated from plug base 820.

[0046] In a first mode of operation a low frequency electric power is applied to translation mechanism 840A, and in response translation mechanism 840A expands, separating plate 860 from base plate 820 of micro-plugs 870, to a scent producing position. 30 A high frequency electrical power is further supplied to vibrator 840B thus vibrating plate 860 and atomizing liquid in contact with first face 882. In an exemplary embodiment the high frequency electrical power exhibits a frequency range of 150 - 200 kHz, however this is not meant to be limiting in any way. Advantageously, the amount of separation between plug 11 WO 2010/079485 PCT/1L2010/000016 base 820 and plate 860 may be varied responsive to the viscosity of the liquid being atomized or nebulized thus varying the dimensions of the ring shaped aperture produced by micro-plugs 870 in cooperation with perforations 880, and thus a single ultrasonic micro-plug unit may be utilized for liquids having a wide range of viscosity without being blocked. 5 [0047] In a second mode of operation, electrical power is disconnected from, or supplied inverted to, translation mechanism 840A, and in response translation mechanism 840A contracts, bringing plate 860 into closer proximity with plug base 820 until micro-plugs 870 are seated flush within perforations 880, i.e. a closed position, thus sealing the volatile scent liquid from second face 884, and preventing any further scent from being experienced 10 distal of second face 884. The particular conical shape mentioned above results in a complete seal, which is preferred for use with a volatile scent liquid, however this is not meant to be limiting in any way. In another embodiment a complete seal is not required in the second mode, but only that the plurality of micro-plugs travel sufficiently through perforations 880 to ensure that no residual liquid remains within perforations 880 to prevent occlusion. 15 [0048] In a third mode of operation, while micro-plugs 870 are seated flush within perforations 880, a medium to high frequency electrical power, in one non-limiting embodiment being from 40 kHz to 400 kHz, is supplied to piezoelectric element 840, thus vibrating the combination of plate 860 and micro-plugs 870. Any residual volatile scent on tip ends 875 and second face 884 is promptly atomized, or nebulized, and removed thus 20 completely ceasing scent production.

[0049] FIG. 5 illustrates a high level schematic diagram of a driving circuit useable with electronically controlled scent producing element 800 of FIGS, 1A - 4C, comprising a pulse generator 950, a driver 960, a first piezoelectric element 840A and a second piezoelectric element 840B, an electrical characteristic sense circuit 970 and control circuit 25 980. Pulse generator 950 preferably comprises a low frequency functionality 952, a high frequency functionality 954 and an ultrasonic cleaning functionality 956. Control circuit 980 is in communication with each of pulse generator 950, driver 960 and electrical characteristic sense circuit 970. The output of pulse generator 950, which may comprise a plurality of outputs as illustrated, is connected via driver 960, to a first contact of each of first 30 piezoelectric element 840A and second piezoelectric element 840B, respectively. The second contact of each of first piezoelectric element 840A and second piezoelectric element 840B, are respectively to electrical characteristic sense circuit 970, which may comprise a sense resistor and a comparator arranged to compare the voltage drop across the sense resistor with 12 WO 2010/079485 PCT/IL2010/000016 a value supplied by control circuit 980. In the event that a single piezoelectric element 840 is provided, one of pulse generator 950 and driver 960 are arranged to provide a combined signal to piezoelectric element 840. Alternately, as described above, a pair of electrodes are supplied at each end of the single piezoelectric element 840, a first of the pair of electrodes 5 responsive to low frequency functionality 952 and a second of the pair of electrodes responsive to high frequency functionality 954.

[0050] ♦ In operation, and as described above, control circuit 980 operates low frequency functionality 952 to generate a low frequency electrical power, which is driven towards piezoelectric element 840 by driver 960, and is operative, for example, to separate 10 plate 860 from base plate 820. High frequency functionality 954 is arranged to vibrate one or more of plate 860 and base plate 820. In particular modes, responsive to control circuit 980, ultrasonic cleaning functionality 956 is operative in the absence of both low frequency electrical power from low frequency functionality 952 and high frequency electrical power from high frequency functionality 954 to perform ultrasonic cleaning by providing vibrating 15 energy to base plate 820 and plate 860 while seated flush.

[0051] Control circuit 980 is further operative to monitor at least one electrical characteristic of piezoelectric element 840 in combination with the vibrated elements, via electrical characteristic sense circuit 970. In a first mode of operation, the natural resonant frequency of piezoelectric element 840 in combination with the vibrated elements is found by 20 sweeping, or stepping through, a range of frequencies. The natural frequency exhibits the lowest resistance to electrical current flow, and thus by monitoring the amount of current flow through piezoelectric element 840 responsive to high frequency functionality 954, the natural resonant frequency of piezoelectric element 840 in combination with the vibrated elements is found. In the event that the natural resonant frequency does not match an integer 25 function of frequencies supplied by high frequency functionality 954, in one embodiment the frequency is toggled between one just above and just below the natural resonant frequency to achieve an average of the natural resonant frequency.

[0052] The natural resonant frequency is a function of liquid volume in communication with piezoelectric element 840, the vibrated elements, temperature and age of 30 piezoelectric element 840., Thus, in the event that the found natural resonant frequency is indicative, due to the parameters being outside of a predetermined range, that an insufficient amount of volatile scent liquid is in communication with piezoelectric element 840, control circuit 980 is operative to assert a low liquid alarm signal.' 13 WO 2010/079485 PCT/IL2010/000016 [0053] FIG. 6 illustrates a high level flow chart of the operation of control circuit 980 of FIG. 12, in accordance with an exemplary embodiment. In stage 3000, a protocol is loaded by control circuit 980, preferably comprising a target frequency for low frequency functionality 952, a target frequency for high frequency functionality 954, a driving 5 amplitude for driver 960, a length of time for operation, an operation mode and a low fluid alarm condition. In one non-limiting example, a scent producing protocol comprises a low frequency target value of 50 Hz, a low frequency amplitude of 20V, a hi&h frequency target value of 159 kHz, a high frequency amplitude of 30V, a length of time of 2 seconds, and a pulsed mode of operation. In one non-limiting example, a cleaning protocol comprises a low 10 frequency target value of 0 Hz, a low frequency amplitude of 0V, a high frequency target value of 50 kHz, a high frequency amplitude of 25V, a length of time of 6 seconds, and a continuous mode of operation. As described above the amplitude of driver 960 may be set for electrical power responsive to low frequency functionality 952, thus the amount of separation between plug base 820 and plate 860 may be varied responsive to the viscosity of 15 the liquid being atomized or nebulized, and thus a single ultrasonic micro-plug unit may be utilized for liquids having a wide range of viscosity without being blocked.

[0054] In stage 3010, control circuit 980 is operative to separate plate 860 from plug base 820 by operating a translation mechanism. In an exemplary embodiment, the translation mechanism is a piezoelectric element 840A,with a signal responsive to low frequency V. 20 functionality 952. The amplitude of the low frequency signal is controlled by driver 960 responsive to the loaded protocol of stage 3000.

[0055] In stage 3020, the natural frequency of vibration is found and the frequency of vibration being driven by pulse generator 950, and in particular by high frequency functionality 954 is modified to match the natural frequency of vibration, by sweeping or 25 steeping above and below the loaded high frequency target frequency of stage 3000. In the event that the natural resonant frequency does not match an integer function of frequencies supplied by high frequency functionality 954, in one embodiment the frequency is toggled between one just above and just below the natural resonant frequency to achieve an average of the natural resonant frequency. 30 [0056] In stage 3030, the electrical characteristic at the found natural frequency of vibration is compared with a predetermined range loaded as part of the protocol of stage 3000, In the event that the found natural frequency of vibration, or the electrical characteristic at the found natural frequency of vibration, is not with the predetermined range, 14 213911/2 but is instead indicative of a lack of volatile scent liquid an out of fluid alarm signal is asserted.

[0057] In stage 3040, at least one of plug base 820 and plate 860 is vibrated at the found natural frequency of stage 3020, in accordance with the operation mode and length of 5 time of operation, loaded as part of the protocol of stage 3000.

[0058] It is appreciated that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may also be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any 10 suitable sub-combination.

[0059] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as are commonly understood by one of ordinary skill in the art to which this invention belongs. Although methods similar or equivalent to those described herein can be used in the practice or testing of the present invention, suitable methods are described 15 herein.

[0060] In case of conflict, the patent specification, including definitions, will prevail.

In addition, the materials, methods, and examples are illustrative only and not intended to be limiting.

[0061] It will be appreciated by persons skilled in the art that the present invention is 20 not limited to what has been particularly shown and described hereinabove. Rather the scope of the present invention is defined by the appended claims and includes both combinations and sub-combinations of the various features described hereinabove as well as variations and modifications thereof, which would occur to persons skilled in the art upon reading the foregoing description. 15 cra&’an , crnxan rwzn ατα inia^n pnow pnszn irn πτ “|»oa ,ρνιη ηχΰπ naoana ma™ na^maa np’ioa .zruwan rwaa mpnan pmi1? oxnm οιηπη Pi?

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.(moia nannn) cras^an mwa