Patent Application
20180242711
In an aspect, a brush comprises a plurality of filaments having a crimp structure and a J structure to provide a full distribution of filaments at an end surface of the brush, wherein the crimp structure of a majority of the filaments is configured with a period length of 2 mm to 5 mm and a peak to peak length of not greater than 0.8 mm, and the J structure is configured with a long length about 0.02 inches to about 1.2 inches, and a difference between the long length and a short length is about 0.2 inches to about 0.5 inches.
In an embodiment, a majority of the filaments have a diameter of about 0.002 inches to about 0.02 inches.
In an embodiment, the long length ends in a taper and the short length ends in a round end or flat cut end.
In an embodiment, the filaments are bent, and a bent portion of the filament is inserted within a recess in a base of the brush, the bent filaments define the long length and the short length of the J structure.
In an embodiment, the filaments comprise a blend of filaments of different diameters.
In an embodiment, the brush comprises a total weight of filaments, wherein the total weight includes from 70 wt % to 90 wt % of 3 mil filaments, from 5 wt % to 20 wt % of 4 mil filaments, and from 5 wt % to 20 wt % of 5 mil filaments, wherein mil is defined as one-thousandth (0.001) of an inch.
In an embodiment, the filaments comprise a plurality of cross-sectional shapes.
In an embodiment, the filaments comprise solid and hollow filaments.
In an embodiment, the filaments are made from polybutylene terephthalate polyester or a thermoplastic elastomer or a combination thereof.
In an embodiment, the brush comprises a plurality of tufts of filaments, each tuft being separated by spaces from other tufts at a base of the brush, and the filaments fill in the spaces between the tufts to give a uniform distribution of the filaments at a distal end of the brush.
In an aspect, a method for applying a liquid cosmetic comprises applying a liquid cosmetic to a skin surface with the brush of Claim 1 oscillating at a frequency of about 150 to about 185 Hz and at an amplitude between about 1 degrees to 18 degrees peak to peak.
In an aspect, a brush appliance, comprises a brush head coupled to an electro-mechanical resonator of the appliance, wherein the brush head is configured to reciprocate at a sonic frequency; and one or more magnets on the brush head or the appliance, wherein the one or more magnets are configured to attract iron-containing loose particles.
In an embodiment, the magnets are permanent or electro-magnetic magnets.
In an embodiment, the brush comprises one or more brush head magnets positioned on the brush head; and one or more appliance magnets positioned on the appliance adjacent to the brush head, wherein the one or more brush head magnets are positionable between a first and second position, the first position is a position wherein the brush head magnets have a magnetic field strength, and the second position is a shunt position wherein the magnetic field strength of the brush head magnets is reduced.
In an embodiment, the brush comprises a timer to shut off the appliance after being on for a predetermined time period.
In an embodiment, the brush head magnets are position on a first ring, and the appliance magnets are positioned on a second ring adjacent to the first ring, wherein the first ring is rotatable to align the brush head magnets with the appliance magnets.
In an aspect, a method for applying a dry cosmetic comprises applying a dry cosmetic to a skin surface with a brush reciprocating at a sonic frequency having a plurality of filaments, wherein the majority of the filaments have a diameter of 3 to 5 mils and a length of 0.3 to 0.7 inches.
In an embodiment, the dry cosmetic is a loose powder or compacted cake.
In an embodiment, the brush head has an oscillating amplitude of 2 degrees to 3 degrees.
In an embodiment, the method comprises exfoliating skin cells with the brush.
This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the Detailed Description. This summary is not intended to identify key features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
The foregoing aspects and many of the attendant advantages of this invention will become more readily appreciated as the same become better understood by reference to the following detailed description, when taken in conjunction with the accompanying drawings, wherein:
The detailed description set forth below in connection with the appended drawings where like numerals reference like elements is intended as a description of various embodiments of the disclosed subject matter and is not intended to represent the only embodiments. Each embodiment described in this disclosure is provided merely as an example or illustration and should not be construed as preferred or advantageous over other embodiments. The illustrative examples provided herein are not intended to be exhaustive or to limit the claimed subject matter to the precise forms disclosed.
The following discussion provides examples of devices that relate to skin care, and more particularly, to brushes and the replaceable brush heads suitable for use with a personal care appliance for skin treatment of any exterior body part of a subject.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of one or more embodiments of the present disclosure. It will be apparent to one skilled in the art, however, that many embodiments of the present disclosure may be practiced without some or all of the specific details. Further, it will be appreciated that embodiments of the present disclosure may employ any combination of features described herein.
Turning now to
In an aspect, a brush 30 is disclosed. In an embodiment, the brush 30 is constructed on the brush head 20 to be used with appliance 22. However, other embodiments of the brush 30 are constructed to be attached to wooden or plastic handles (not shown). In an embodiment, an oscillating appliance 20 and a brush 30 having crimped filaments is used to apply a liquid, including a liquid foundation to the skin, face, or other areas of the body. The method results in the application of liquid foundation smoother than manual application, with a reduction in the visibility of fine lines, pores, and skin imperfections, while maintaining long-wearing results.
As shown in
The brush head 20 includes a brush portion or brush 30.
In an embodiment, the brush head outer surface 48 includes a plurality of recesses, wherein each recess holds a tuft of filaments. In an embodiment, each of the recesses, and therefore, the tufts 32 at the outer surface 48 are separated from each other. The characteristics of the individual filaments are such that at the distal end 34 of the brush 30, the individual tufts 32 cannot be perceived. In other words, the filament ends appear as a uniform distribution of filaments rather than as tufts 32. In an embodiment, the filaments that make up the individual tufts 32 include one or more crimps. The crimps give the brush 30 a uniform distribution of the filaments, as opposed to individual tufts 32, at the distal end surface 34 of the brush 30. In an embodiment, all filament lengths are similar so that the distal end surface 34 of the brush 30 appears flat. In another embodiment, the filament lengths are longer in the center and shorten along the radial direction so that the brush 30 has a tip or taper.
In an embodiment, each tuft 32 includes from about 10 to 360 individual filaments. In an embodiment, each tuft 32 includes from about 20 to 180 individual filaments. In an embodiment, each tuft includes 120 to 180 filaments per tuft, given a tuft hole that is 0.070 inches. In an embodiment, a density of filament tips at the application surface is about 10,000 to 15,000 tips per square inch, or any value in between. In an embodiment, a density of filament tips at the application surface is about 7,500 to 20,000 tips per square inch, or any value in between.
In an embodiment, the filaments have a length (from surface 48 to surface 34) of about 0.20 inches (5.08 millimeters) to about 1.2 inches (30.48 millimeters) or greater and a diameter in the range of about 0.002 inches (0.0508 millimeters) to about 0.020 inches (0.508 millimeters) or greater. In an embodiment not all filament lengths are the same. In some embodiments, one tuft of filaments can have a longer length than another tuft of filaments. In an embodiment, the tufts 32 near the center of the brush 30 have longer filaments, and the length of filaments decreases as the tufts are placed radially outward. In an embodiment, filament lengths vary even among a single tuft 32. The filaments are constructed out of a variety of materials, including but not limited to elastomers, co-elastomers, polymers, co-polymers, and blends or combinations thereof, etc. In another embodiment, the filaments can be natural, such as mammal hair or fur.
In an embodiment, one or more of the filaments are constructed out of polybutylene terephthalate (PBT) polyester or thermoplastic elastomer (TPE) or a TPE/PBT blend. Representative filaments are constructed from DuPont™ Tynex®, Supersoft Hytrel® thermoplastic elastomer filaments or DuPont™ Natrafil® polyester with texturing additives with high performance suitable for sonic applications. Filaments with differing bending characteristics, such as DuPont™ Tynex® nylon of differing blends (i.e., 6, 6.10, 6.12 etc.), are also selected depending on its intended application and desired characteristics. Other DuPont™ Tynex® nylons are employed to construct the filaments, including DuPont™ Tynex® PTFE i.e., DuPont™ Tynex® PTFE is Nylon 6.12 (i.e., 0906). In an embodiment, the filaments are constructed out of or include an elastomer. In an embodiment, a filament includes an elastomeric (e.g., TPE) inner core and a polymer (e.g., PBT) outer jacket. Although DuPont materials are mentioned herein with their trade names, it is understood that generic equivalents and variations may be suitable for use also, such as: polypropylene, polyethylene, such as DuPont™ Bynel®, with combinations or blends thereof, etc.
In an embodiment, the filaments have cross sections including but not limited to solid or hollow, round, rectangular, star, diamond, X-shape, quadralobal, and also including textured surfaces. In an embodiment, additives are added that can either enhance sonic resonance characteristics, or provide extra benefits such as silver zeolite for antibacterial effects. In an embodiment, additives are used to modify the surface energy of the filaments and control the surface energy. In an embodiment, the filaments also contain an anti-microbial additive that helps prevent microbial growth.
Referring to
Methods for crimping filaments 100 generally include the application of heat and pressure, or by the rolling of the filaments 100 between fluted rolls. Other methods for crimping filaments 100 include the injection of high pressure air being directed at the outlet of the nozzle as the filaments 100 are being extruded. Other methods for crimping include the use of a matching set of crimp heads, wherein one head (the die) has a cavity and the mated head (the anvil) presses the filament 100 against the cavity to create the crimp structure. Embodiments are not limited to any one particular method of manufacture.
In an embodiment, a plurality of crimped filaments 100 are joined to construct an individual tuft 32. In an embodiment, a plurality of individual tufts 32 form the brush 30. In an embodiment, a plurality of filaments 100 with a crimp structure create a uniformly distributed filament surface 34 at the distal end of the brush 30. In an embodiment, a uniform filament surface means that when the brush 30 is viewed from the filament ends, the filament ends are uniformly spaced from each other giving the appearance of having no visibly discernable tufts. In other words, the filaments' ends are uniformly spaced from each other. In an embodiment, the filaments with a crimp structure coupled together into a plurality of tufts deliver smoother application of liquid foundation, for example.
In an embodiment, the crimping of filaments allows the brush to appear fuller and bushier and appear more like a kabuki makeup brush. Current cosmetic brushes are made by collecting a large amount of filaments, then, gluing and fusing them together. This gives the effect of having an even/regular distribution of filament spacing across the entirety of the brush. With tufted brush construction (staple set or anchor free), typical filaments (when tufted) tend to stand up straight creating defined spaces between tufts and open spaces even at the end of the brush. These spaces between tufts can cause “streaking” when applying cosmetic as the edges of the tufts can push the liquid foundation into the gaps between tufts. Thus, by crimping the filaments 100, a brush is achieved that has staple set tufting and overcomes problems, such as streaking.
In an embodiment, a tuft 32 includes crimped filaments 100 having a plurality of diameters in a proportional mixture. A plurality of filaments 100 having a crimp structure can have an advantage of stability and inertia in operation with the oscillating appliance 22.
In an embodiment, the crimped filaments 100 are constructed into individual tufts 32 with a J-offset structure as shown in
In an embodiment, the filaments 100 have an ultra-fine taper 204 at the long length end 202 and a round (non-tapered end) at the short length end 206. In an embodiment, using an ultra-fine taper 204 at the long length end 202 and having a generally round non-tapered end on the short length 206 on the filaments 100 minimizes the effect of exfoliation while applying foundation. Exfoliation while applying liquid foundation at the same time can lead to exfoliated skin being mixed into the foundation and applied back onto the skin, leaving an uneven finish. In an embodiment, filaments 100 of the brush 30 include a crimp structure, a J structure, a tapered end at the long length 202 and a rounded end at the short length end 206, or any combination thereof.
In an embodiment, the definition of an ultra-fine taper is where the taper length 204 on the tapered end of the filament 100 is greater than 2 mm. In an embodiment, the definition of an ultra-fine taper is where the taper length 204 on the tapered end of the filament 100 is greater than 5 mm. In an embodiment, the definition of an ultra-fine taper is where the taper length 204 on the tapered end of the filament 100 is greater than 11 mm. The taper length begins when the diameter of the filament 100 becomes less than the maximum filament diameter.
In an embodiment, the J-offset structure in the brush 30 provides advantages in performance. In an embodiment, a J-offset structure minimizes the risk of exfoliation by keeping the non-tapered end further away from interaction with the skin during application. In an embodiment, a J-offset structure creates a filament density differential so that the filament density increases below the J-offset so that the liquid formulation is hindered from moving further down along filaments. In an embodiment, the J-offset is the same for all filaments in a tuft 32 or in the brush 30. In an embodiment, the J-offsect is different for filaments in a tuft 32 or throughout the brush 30.
In an embodiment, fine tip profiles/shapes (for example, less than 2 mil (0.002″) cross section/diameter at the tips) on larger diameter filaments (for example, greater than 5 mil diameter), also apply a more even application when coupled with oscillating sonic technology.
In an embodiment, a blend of filaments 100 is controlled before bristling by organizing filaments into groups or bundles by weight and/or fiber diameter. In an embodiment, a blend of filaments 100 has a plurality of portions measuring from 5% to 95% by weight. For example, in an embodiment, a blend of filaments 100 has the following proportions: 48 grams (80 wt %) of 3 mil filaments; 6 grams (10 wt %) of 4 mil filaments; 6 grams (10 wt %) of 5 mil filaments (where mil refers to a thousandth of an inch). In an embodiment, a blend of filaments 100 has from 70 wt % to 90 wt % of 3 mil filaments. In an embodiment, a blend of filaments 100 has from 1 wt % to 20 wt % of 4 mil filaments. In an embodiment, a blend of filaments 100 has from 1 wt % to 20 wt % of 5 mil filaments. In all of the above, the filaments include a crimp structure. In one embodiment, the filaments 100 include the crimp structure, the J-offset structure, a tapered long length end, and a rounded short length end.
The mixed diameter filaments with crimping allows for a fuller looking brush while keeping the mass light enough to couple more effectively with most resonant oscillating appliances.
In an aspect, a method to apply liquid foundation or any other liquid cosmetic includes oscillating a brush in contact with a liquid cosmetic, wherein the brush includes a plurality of tufts of the filaments 100 having the crimp structure, the J-offset structure or both the crimp structure and the J-offset structure. In an embodiment, the filaments 100 further include the tapered long length end and the rounded short length end. In an embodiment, the filaments 100 include a blend of filament diameters in the proportions indicated. In an embodiment, the oscillating brush head 20 operates between 40 to 350 Hz. In an embodiment, the oscillating brush head 20 operates between a frequency 150 to 185 Hz. In an embodiment, the oscillating brush head 20 oscillates at an angular amplitude between 1 to 18 degrees peak to peak. In an embodiment, the oscillating brush head 20 oscillates at an angular amplitude between 1 to 18 degrees peak to peak.
In an embodiment, the liquid composition includes liquid foundation. In an embodiment, the liquid composition is applied on skin. In an embodiment, the skin is the face. In an embodiment, the method further includes dry exfoliation of the skin which helps prepare the skin surface to apply cosmetic, and blends smoothly to the skin surface.
The method further includes applying an amount of foundation on the skin, for example, with the use of finger tips, sponges, and the like. Then, the appliance brush head combination is used by starting at the cheek, moving the appliance 22 in a circular motion. In an embodiment, no or very little pressure is applied. Blending of foundation can include the forehead, nose, and chin area, in that order. In an embodiment, longer filaments are used around corners and curves, such as, nose, under eyes, over and between the eyebrows, and around the lip area. Using the above steps also keeps the liquid foundation from becoming lodged deeper into the brush, thus making it easier to clean and stay sanitary.
In another aspect, a method for applying dry formulations is disclosed. In an embodiment, dry cosmetics are applied using an appliance 22 that oscillations in the sonic range. A dry cosmetic includes powder and compacted cosmetics, such as a pressed cake. The method results in more effective application without creating excessive aerosol, resulting in a smooth polished look.
In an embodiment, the addition of one or more magnets in the brush head 20 decreases the amount of aerosol generated when removing the cosmetic from the source and while applying the cosmetic. Although it would be anticipated that the brush 30 would generate a dust cloud, the specific amplitude and frequency, however, enables the filaments to be coated with powder while preventing excess build up. One or more magnets surrounding the brush head 20 also helps with aerosol reduction. Then, the brush loaded with cosmetic is contacted against the skin where the cosmetic is needed, and caused to oscillate at sonic frequencies. This transfers the cosmetic to the skin. During the application step, the filaments also loosen and remove the lightly adhered dry skin cells. These are the cells that can cause manually applied cosmetic to look flakey and patchy due to the cells being coated with cosmetic and being visually accentuated. In an embodiment of the method, the exfoliation of cells allows the cosmetic to occupy the area formerly occupied by the exfoliated cells resulting in a smooth polished look. In an embodiment, sonic application includes dry exfoliation of skin cells. Typically consumers use an exfoliating cleanser to remove excessive buildup of dry or dead skin cells. However, a brush oscillating at sonic frequencies is used to gently remove this build up.
In an embodiment, the method is for the application of dry cosmetics, including, but not limited to, foundations, blushes, bronzers, eye shadow, eyeliner, concealer, and eyebrow cosmetic. In an embodiment, a dry cosmetic includes iron oxide pigments. In an embodiment, a foundation is a loose powder or pressed cake formulation. In an embodiment, a foundation includes pigments, such as iron oxide, to hide imperfections and to give a healthier look to the skin. In an embodiment, a bronzer is similar to a foundation, but is used on the body to give the consumer a tanned look. In an embodiment, a blush is similar to a foundation, but includes redder hues. Blushes are applied to the cheeks of the face after the base foundation is applied. The redder hue gives a healthy glow and can be used to create the illusion of higher cheek bones. In an embodiment, a concealer is a type of foundation. A concealer is used to hide or conceal, for example, dark circles under the eyes and even on thin eyelids with apparent veins. In an embodiment, an eye shadow includes highly pigmented powders that are applied to the eyelid to accentuate the iris of the eye.
In an embodiment, the filament material for sonic application of dry cosmetics includes, but is not limited, to Tynex® nylon filaments, Supersoft elastomeric polymers (Hytrel®), or a combination thereof. In an embodiment, the filament characteristics include tip characteristics, which are tapered or rounded, or a combination. In an embodiment, a method of applying dry cosmetics includes using a brush having filaments, wherein the filaments are 3 to 5 mils in diameter and 0.3 to 0.8 mm in length, or any value in between these ranges. In an embodiment, the optimal range of filament characteristics is dependent on the acoustical energy generated by the handle (frequency and amplitude).
In an embodiment, a method of applying dry cosmetics includes a brush head oscillating amplitude of 2 to 3 degrees. In an embodiment, a method of applying dry cosmetics includes a brush head oscillating amplitude of 1 to 5 degrees, or any amplitude within the range.
In the application of dry cosmetics via sonic application several advantages may be noted. In an embodiment, a smoother application of the cosmetic after continual use of a sonic cleansing brush is noted. In an embodiment, dry cosmetic goes on smoother if the skin is sonically cleansed. In an embodiment, application of dry cosmetics directly on the skin using sonic application results in an even and polished look without an excessive dusty aerosol. In an embodiment, sonic application also prepares the skin by removing the loosely adherent skin cells resulting in a minimal cosmetic layer requirement with excellent coverage. In an embodiment, cells are known to respond to various stimuli including mechanical stimulation. In an embodiment, the sonic action increases blood flow, and activates cells to accelerate division and increase collagen.
In an embodiment, the brush head 20 includes magnets. In an embodiment, the magnets pick up iron oxide, which is a common ingredient in dry cosmetics. In an embodiment, the magnets prevent excessive aerosol and splatter when the cosmetic is being picked up by the brush and during its application.
Referring to
In an embodiment, the magnets 304 and 308 are permanent magnets. In an embodiment, the outer ring 302 is positioned with the inner ring 304 as in
In an embodiment, a timer sequence is initiated when the appliance 22 is turned on. In an embodiment, the timer is set to time out after a certain period, automatically shutting off the appliance 22. The timer period may be set from a few seconds to infinite time out (user must turn off the device). In an embodiment, the period of operation is 15 seconds.
In an aspect, a brush comprises a plurality of filaments having a crimp structure to provide a full distribution of filaments at an end surface of the brush, wherein the crimp structure of a majority of the filaments is configured with a period length of 2 mm to 5 mm and a peak to peak length of not greater than 0.8 mm. In an embodiment, the brush further comprises a J structure that is configured with a long length about 0.02 inches to about 1.2 inches, and a difference between the long length and a short length is about 0.2 inches to about 0.5 inches. In an embodiment, a majority of the filaments have a diameter of about 0.002 inches to about 0.02 inches. In an embodiment, the long length ends in a taper and the short length ends in a round end or flat cut end. In an embodiment, the filaments are bent, and a bent portion of the filament is inserted within a recess in a base of the brush, the bent filaments define the long length and the short length of the J structure. In an embodiment, the filaments comprise a blend of filaments of different diameters. In an embodiment, the brush comprises a total weight of filaments, wherein the total weight includes from 70 wt % to 90 wt % of 3 mil filaments, from 5 wt % to 20 wt % of 4 mil filaments, and from 5 wt % to 20 wt % of 5 mil filaments, wherein mil is defined as one-thousandth (0.001) of an inch. In an embodiment, the filaments comprise a plurality of cross-sectional shapes. In an embodiment, the filaments comprise solid and hollow filaments. In an embodiment, the filaments are made from polybutylene terephthalate polyester or a thermoplastic elastomer or a combination thereof. In an embodiment, the brush comprises a plurality of tufts of filaments, each tuft being separated by spaces from other tufts at a base of the brush, and the filaments fill in the spaces between the tufts to give a uniform distribution of the filaments at a distal end of the brush.
In an aspect, a method for applying a liquid cosmetic comprises applying a liquid cosmetic to a skin surface with the brush of Claim 1 oscillating at a frequency of about 150 to about 185 Hz and at an amplitude between about 1 degrees to 18 degrees peak to peak.
In an aspect, a brush appliance comprises a brush head coupled to an electro-mechanical resonator of the appliance, wherein the brush head is configured to reciprocate at a sonic frequency; and one or more magnets on the brush head or the appliance, wherein the one or more magnets are configured to attract iron-containing loose particles. In an embodiment, the magnets are permanent or electro-magnetic magnets. In an embodiment, the brush comprises one or more brush head magnets positioned on the brush head; and one or more appliance magnets positioned on the appliance adjacent to the brush head, wherein the one or more brush head magnets are positionable between a first and second position, the first position is a position wherein the brush head magnets have a magnetic field strength, and the second position is a shunt position wherein the magnetic field strength of the brush head magnets is reduced. In an embodiment, the brush comprises a timer to shut off the appliance after being on for a predetermined time period. In an embodiment, the brush head magnets are position on a first ring, and the appliance magnets are positioned on a second ring adjacent to the first ring, wherein the first ring is rotatable to align the brush head magnets with the appliance magnets.
In an aspect, a method for applying a dry cosmetic comprises applying a dry cosmetic to a skin surface with a brush reciprocating at a sonic frequency having a plurality of filaments, wherein the majority of the filaments have a diameter of 3 to 5 mils and a length of 0.3 to 0.7 inches. In an embodiment, the dry cosmetic is a loose powder or compacted cake. In an embodiment, the brush head has an oscillating amplitude of 2 degrees to 3 degrees. In an embodiment, the method comprises exfoliating skin cells with the brush.
In an aspect, a brush comprises a plurality of tufts of filaments, each tuft being separated by spaces from other tufts at a base of the brush, and a majority of the filaments in each tuft have a crimp defined by a peak to peak length of 2 mm to 5 mm and a length period of not greater than 0.8 mm. In an embodiment, the filaments of the tufts are bent, and the bent portion of the filament is inserted within a recess in the base of the brush, the bent filaments have a long length and a short length. In an embodiment, the long length is about 0.02 inches to about 1.2 inches, and a difference between the long length and the short length is about 0.2 inches to about 0.5 inches. In an embodiment, a majority of the filaments have a diameter of about 0.002 inches to about 0.02 inches. In an embodiment, the long length ends in a taper and the short length ends in a round end. In an embodiment, the filaments fill in the spaces between the tufts to give a uniform distribution of the filaments at a distal end of the brush. In an embodiment, each tuft has a blend of filaments of two or more diameters.
In an aspect, a method for applying a liquid cosmetic comprises applying a liquid cosmetic to a skin surface with an oscillating brush having a plurality of tufts of filaments, each tuft being separated by spaces from other tufts at a base of the brush, and a majority of the filaments in each tuft have a crimp defined by a peak to peak length of 2 mm to 5 mm and a length period of not greater than 0.8 mm. In an embodiment, the brush oscillates at a frequency of about 150 to about 185 Hz and at an amplitude between about 1 degrees to 18 degrees peak to peak.
In an aspect, a brush appliance comprises a brush head coupled to an electro-mechanical resonator of the appliance, wherein the brush head is configured to reciprocate at a sonic frequency; and one or more magnets on the brush head or the appliance, wherein the one or more magnets are configured to attract iron-containing loose particles. In an embodiment, the magnets are permanent or electro-magnetic magnets. In an embodiment, one or more brush head magnets positioned on the brush head; and one or more appliance magnets positioned on the appliance adjacent to the brush head, wherein the one or more brush head magnets are positionable between a first and second position, the first position is a position wherein the brush head magnets have a magnetic field strength, and the second position is a shunt position wherein the magnetic field strength of the brush head magnets is reduced. In an embodiment, the brush head magnets are position on a first ring, and the appliance magnets are positioned on a second ring adjacent to the first ring, wherein the first ring is rotatable to align the brush head magnets with the appliance magnets.
In an aspect, a method for applying a dry cosmetic comprises applying a dry cosmetic to a skin surface with a brush reciprocating at a sonic frequency having a plurality of tufts of filaments, each tuft being separated by spaces from other tufts at a base of the brush, and a majority of the filaments in each tuft have a crimp defined by a peak to peak length of 2 mm to 5 mm and a length period of not greater than 0.8 mm. In an embodiment, the dry cosmetic is a loose powder or compacted. In an embodiment, the brush comprises a single tuft of filaments. In an embodiment, brush filaments have a diameter of 5 mil or less. In an embodiment, brush filaments have a diameter of 3 mil or less. In an embodiment, brush filaments have a length of 0.6 inches or less. In an embodiment, the brush head has an oscillating amplitude of 2 degrees to 3 degrees.
1. Brush Head Optimization Methods
Using an in-house validated method to measure the effectiveness of products to be evenly distributed to the skins' surface, and by using questionnaires to evaluate the sensation felt during and after cosmetic application, the permissible range for an optimal brush head design for sonic cosmetic application to the skin was determined. The method used to measure the application to the skin is based on quantifying the level of cosmetic and percent coverage using before and after images. A standard cosmetics brush and a sonic brush were placed on a cake foundation compact for an equivalent amount of time. Each cosmetic laden brush was then applied to one of the two cheeks in a defined area for a given period of time. An image was taken using a Canfield™ camera before and after application.
Two filament types were tested including Tynex (nylon) and Supersoft (TPE) of the following diameters: less than 3 mil, 3 mil, 4 mil, 5 mil, and greater than 5 mil, and including the following lengths: less than 0.3, 0.3, 0.325, 0.375, 0.4, 0.5, 0.6, 0.7, and greater than 0.8 inches. Filaments with a 5 mil diameter, at lengths of 0.375 inches or greater, were tolerable by some individuals. However, most subjects could not stand facial contact for more than a few seconds.
2. Safety Study-TEWL and Redness Test
This example studied the results of the use of a brush made from filaments having a diameter of 0.4 thousands of an inch, and a sonic application of 1 minute exposure on the cheek with limited movement.
In order to ensure that the optimal design range was also safe, exfoliation-safety assays were conducted. In these safety studies the amount of water vapor transpiring from the surface of the skin was measured before and after using the brush (without cosmetic) for an extended period (1 minute) in one spot without moving it. The area was measured using a non-invasive meter. In undamaged skin water transpires at a given rate and is known as the transepidermal water loss (TEWL). If the skin is damaged and too many outer layers of cells are removed, for example when someone skins their knee, the TEWL rapidly increases. The acceleration in TEWL is often seen in products that are too harsh and abrade the skin. By comparing the skin before and after treatment with the sonic brush, the level of safety of each brush head design was determined.
The above data was collected using a brush with Supersoft filaments having 4 mil diameter and 0.6 inches length. A treatment time of 1 minute did not change the TEWL levels indicating that it is safe to use. Further, no changes in redness were observed.
While illustrative embodiments have been illustrated and described, it will be appreciated that various changes can be made therein without departing from the spirit and scope of the invention.
