Serum dispensing cosmetic applicator head

Abstract

Embodiments of the present invention provide a multifunctional cosmetic applicator head and application device designed for controlled and hygienic application of skincare products. The applicator head comprises a main body with a liquid supply channel extending between a first end, which is detachably connected to a container, and a second end configured with a sealing member and one or more rolling elements. The sealing member includes a fixed portion and an elastically deformable movable portion that opens under internal pressure and automatically reseals when pressure is released. The second end features recessed rolling grooves that partially house rolling elements, enabling uniform product application and massage. A detachable cover presses the rolling elements inward to maintain sealing during non-use. The device may further include a stimulation element to provide one or more therapies to a user.

Description

TECHNICAL FIELD

[0001] The present invention relates to the technical field of fluid application devices, and more particularly to an applicator head and application system equipped with an elastic sealing member and a rolling applicator, suitable for controlled and hygienic dispensing of fluid compositions such as skincare products.BACKGROUND

[0002] Applicator devices are widely used in the cosmetic and skincare industry for dispensing and applying products such as eye creams, serums, lotions, and emulsions. These devices are typically attached to containers and allow the user to spread the product directly onto the skin through a nozzle, sponge, or rolling element. While such applicators offer convenience, they often suffer from poor sealing performance. However, a major drawback of existing applicator devices is inadequate sealing, which results in unintended leakage of fluid during storage or transport. In many cases, even minimal pressure applied to the container, such as during transport in a handbag or suitcase, can cause the contents to leak through the applicator outlet. This results in product wastage, contamination of surrounding items, and an unsatisfactory user experience. Attempts to mitigate this issue using simple caps or plugs have proven inadequate, as these solutions often fail to counteract pressure build-up inside the container or provide consistent sealing after repeated use.

[0003] In addition to improved sealing, modern users increasingly seek multifunctional applicators that not only dispense cosmetic products efficiently but also enhance their effectiveness through features such as massage or therapeutic light. Phototherapy, in particular, has gained attention for its ability to promote skin health. Light in specific wavelengths, such as red, blue, or near infrared, can stimulate collagen production, improve circulation, and reduce inflammation, offering substantial cosmetic and dermatological benefits. However, most existing phototherapy solutions are delivered through standalone devices that are either too bulky for convenient use or lack integration with fluid applicators. As a result, users must rely on separate tools to achieve product application and light-based treatment, which compromises convenience, portability, and user engagement.

[0004] The limitations of conventional applicator head devices and the growing demand for combined functionality highlight the need for a novel solution that integrates fluid dispensing, anti-leakage performance, rolling massage, and phototherapy into a unified system.

[0005] The present invention addresses this need by providing an applicator head that incorporates a deformable elastic sealing member at the outlet, which remains closed under ambient conditions and opens only when internal pressure reaches a sufficient threshold. A rolling element is positioned adjacent to the outlet to facilitate smooth product application, while a cover component engages with the rolling element to press the sealing member closed when not in use, thereby preventing leakage. In certain embodiments, the applicator head further includes a light-transmitting end and an embedded light-emitting element for phototherapy, configured to emit light directly onto the user’s skin during use. This integration of controlled product dispensing, reliable sealing, rolling application, and therapeutic light within a compact structure enables a superior user experience and represents a significant advancement in the field of skincare applicator technology.OBJECTS OF THE INVENTION

[0006] Some of the objects of the invention are as follows:

[0007] An object of the present invention is to provide an applicator head device that allows for controlled and hygienic dispensing of skincare products, thereby preventing leakage during storage and transport.

[0008] Another object of the present invention is to provide a coating device equipped with a sealing member having a movable elastic portion, which opens only under internal pressure and automatically reseals upon pressure release.

[0009] Another object of the present invention is to provide an applicator head with integrated rolling elements that enable even distribution and massaging of the skincare formulation across the skin surface.

[0010] Another object of the present invention is to provide a multifunctional applicator head that supports additional features such as vibration massage and light therapy for enhanced skincare benefits.

[0011] Another object of the present invention is to offer an ergonomically designed applicator head with inclined rolling elements that conform better to facial contours and enhance user comfort.

[0012] Another object of the present invention is to ensure ease of manufacturing and assembly by providing a modular structure suitable for plastic injection molding and integration into various types of skincare packaging.SUMMARY OF THE INVENTION

[0013] According to a first aspect of the present invention, an applicator head is provided. The applicator head comprising: a main body having a first end configured to be coupled to a container and a second end; a liquid supply channel extending through the main body from the first end to the second end; a sealing member disposed adjacent to an outlet of the liquid supply channel, the sealing member comprising a fixed portion and a movable portion, the movable portion being elastically deformable relative to the fixed portion and configured to selectively open or close the outlet; at least one rolling element rotatably positioned at the second end and configured to contact a target surface; and a cover body configured to enclose at least part of the second end and comprising a protrusion positioned to abut the rolling element and transmit force to the movable portion of the sealing member to prevent liquid flow.

[0014] In one embodiment of the invention, the cover body comprises at least one protrusion configured to engage with the rolling element and push the rolling element into sealing contact with the movable portion of the sealing member when the cover body is placed, thereby preventing fluid leakage during non-use.

[0015] In one embodiment of the invention, the sealing member is normally closed and opens in response to pressure applied by a user to the container.

[0016] In one embodiment of the invention, the movable portion of the sealing member comprises a pad and a protrusion extending toward the rolling element.

[0017] In one embodiment of the invention, the protrusion is arranged to be engaged by the rolling element during rotation.

[0018] In one embodiment of the invention, the second end comprises a rolling groove for housing the rolling element, wherein the outlet of the liquid supply channel is located on a groove wall of the rolling groove.

[0019] In one embodiment of the invention, a rolling gap is defined between the rolling element and the groove wall, the rolling gap configured to accommodate elastic deformation of the movable portion.

[0020] In one embodiment of the invention, the second end includes a guide groove extending from the outlet toward a peripheral notch of the rolling groove.

[0021] In one embodiment of the invention, the sealing member is secured within a receiving groove formed in the second end of the main body.

[0022] According to a second aspect of the present invention, an applicator head is provided. The applicator head comprising: a main body having a first end configured to be coupled to a fluid container and a second end; a liquid supply channel extending from the first end to the second end; at least one rolling element disposed at the second end and configured to contact a target surface; at least one light-emitting element disposed within the main body and configured to emit light toward the target surface; a light-transmitting component disposed between the light-emitting element and the rolling element, the light-transmitting component being configured to guide light emitted by the light-emitting element toward the target surface through the rolling element; and a sealing member positioned at an outlet of the liquid supply channel and configured to regulate fluid flow.

[0023] In one embodiment of the invention, the light-emitting element comprises at least one LED configured to emit visible, ultraviolet, or infrared light.

[0024] In one embodiment of the invention, the rolling element comprises a light-transmitting material to permit light from the light-emitting element to reach the target surface.

[0025] In one embodiment of the invention, the sealing member comprises a fixed portion and a movable portion; the movable portion is elastically deformable relative to the fixed portion and configured to selectively open or close the outlet.

[0026] In one embodiment of the invention, the applicator head further comprising a cover body having at least one protrusion positioned to abut the rolling element and transmit force to the movable portion of the sealing member to prevent liquid flow.

[0027] According to a third aspect of the present invention, a method for applying a liquid to a target surface using an applicator head is provided. The method comprising: providing an applicator head having a main body with a first end configured to be coupled to a container, a second end, and a liquid supply channel extending from the first end to the second end; providing a sealing member adjacent to an outlet opening of the liquid supply channel, the sealing member comprising a fixed portion and a movable portion; positioning at least one rolling element at the second end of the applicator head such that the rolling element is rotatable and contacts the target surface; applying pressure to the container or actuating the applicator head to elastically deform the movable portion of the sealing member and open the outlet opening to dispense the liquid; and rolling the at least one rolling element across the target surface to apply the dispensed liquid.

[0028] In one embodiment of the invention, the method further comprising: placing a cover body over the second end of the applicator head, the cover body comprising a protrusion configured to abut the rolling element and transmit force to the movable portion of the sealing member to seal the outlet opening and prevent leakage during non-use.

[0029] In one embodiment of the invention, the cover body encloses the second end to seal and prevent accidental actuation or contamination of the rolling element and outlet opening during storage.

[0030] In one embodiment of the invention, the method further comprising: activating a light-emitting element disposed within the applicator head to emit therapeutic light through a light-transmitting rolling element toward the target surface during application.

[0031] In one embodiment of the invention, the method further comprising: providing one or more therapies to a user by providing at least one stimulation element in the applicator head.

[0032] In one embodiment of the invention, the method further comprising: detecting user-applied pressure and actuating at least one stimulation element in response to the pressure.

[0033] In the context of the specification, when an element is referred to as being “fixed to” or “disposed to” another element, it may either be directly on another element or indirectly on that other element. When a component is said to be “connected” or “connected to” another component, it may be directly connected to another component or indirectly connected to other components on the piece.

[0034] In the context of the specification, the terms “first”, “second,” and “third” are only used for descriptive purposes and do not imply the relative importance or implicitly indicate the quantity of technical features indicated.

[0035] In the context of the specification, the term “plurality” means two or more than two, unless otherwise indicated.

[0036] In the context of the specification, the term "several" means more than one, unless otherwise specified.

[0037] In the context of the specification, the term "LED " refers to one or more light-emitting diode (LED) elements that are electrically connected and configured to emit light of specific wavelengths (including visible to IR wavelengths) suitable for therapeutic purposes. The LED module may include drive circuitry, heat dissipation structures, and optical elements such as lenses or diffusers to control light distribution.

[0038] In the context of this specification, terms like “light”, “radiation”, “irradiation”, “emission” and “illumination”, etc. refer to electromagnetic radiation in frequency ranges varying from the visible frequencies to Infrared (IR) frequencies and wavelengths, wherein the range is inclusive of visible light, and IR frequencies and wavelengths. Preferably, it refers to low-level electromagnetic radiation of low-level red and near-infrared (NIR) light. It is to be noted here that IR radiation can be categorized into several categories according to respective wavelength ranges, which are again envisaged to be within the scope of this invention. A commonly used subdivision scheme for IR radiation includes Near IR (0.75-1.4 μm), Short-Wavelength IR (1.4-3 μm), Mid-Wavelength IR (3-8 μm), Long-Wavelength IR (8-15 μm), and Far IR (15-1000 μm). In this regard, light application is at relatively low energy densities, typically below about 500 mW, as compared to other forms of laser therapy that are used for ablation, cutting, and thermally coagulating tissue. In some instances, electromagnetic radiation can also be in wavelengths in the blue or ultraviolet regions, especially for the treatment of conditions that occur at the skin surface, such as psoriasis or infection.

[0039] In the context of the specification, the term “light source” or “phototherapy source” etc. refers to a source emitting coherent laser light, or light-emitting diodes (“LEDs”). The term “light therapy” refers to light generated from any of the sources, such as lasers, LED sources, or Super luminous diodes (“SLD”) or Organic light-emitting diodes (OLED).

[0040] In the context of the specification, “Light Emitting Diodes (LEDs)” refer to semiconductor diodes capable of emitting electromagnetic radiation when supplied with an electric current. The LEDs are characterized by superior power efficiencies, smaller sizes, rapid switching speeds, physical robustness, and longer lifespans compared to incandescent or fluorescent lamps. The one or more LEDs may include through-hole type LEDs (generally emitting electromagnetic radiation in red, green, yellow, blue, and white colors), Surface Mount Technology (SMT) LEDs, Bi-color LEDs, Pulse Width Modulated RGB (Red-Green-Blue) LEDs, and high-power LEDs, among others.

[0041] Materials used in one or more LEDs may vary from one embodiment to another, depending upon the frequency of radiation required. Different frequencies can be obtained from LEDs made from pure or doped semiconductor materials. Commonly used semiconductor materials include nitrides of Silicon, Gallium, Aluminum, Boron, Zinc Selenide, etc., in pure form or doped with elements such as Aluminum and Indium, etc. For example, red and amber colors are produced from Aluminum Indium Gallium Phosphide (AlGaInP) based compositions, while blue, green, and cyan use Indium Gallium Nitride based compositions. White light may be produced by mixing red, green, and blue lights in equal proportions, while varying proportions may be used to generate a wider color gamut. White and other colored lights may also be produced using phosphor coatings such as Yttrium Aluminum Garnet (YAG) in combination with a blue LED to generate white light and Magnesium-doped potassium fluorosilicate in combination with a blue LED to generate red light.

[0042] In addition to conventional mineral-based LEDs, one or more LEDs may also be provided on an Organic LED (OLED) based flexible panel or an inorganic LED-based flexible panel. Such OLED panels may be generated by depositing organic semiconducting materials over Thin Film Transistor (TFT) based substrates. Further, a discussion on the generation of OLED panels can be found in Bardsley, J. N (2004), “International OLED Technology Roadmap”, IEEE Journal of Selected Topics in Quantum Electronics, Vol. 10, No. 1, that is included herein in its entirety, by reference. An exemplary description of flexible inorganic light-emitting diode strips can be found in granted U.S. Pat. No. 7,476,557 B2, titled “Roll-to-roll fabricated light sheet and encapsulated semiconductor circuit devices”, which is included herein in its entirety, by reference.

[0043] In the case of a stimulation element being an electrode, the stimulation element may be embodied as an open-ended conductor. The electrode may then be able to provide Transcutaneous Electrical Nerve Stimulation (TENS), Electronic Muscle Stimulation (EMS), and Microcurrent Electrical Therapy (MET) to the target surfaces. TENS therapy uses low-voltage currents to provide pain relief. Electrical impulses are delivered through electrodes placed on the surface of the body of user. The electrodes are placed at or near nerves where the pain is located or at certain known trigger points.BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0044] The accompanying drawings illustrate the best mode for carrying out the invention as presently contemplated and set forth hereinafter. The present invention may be more clearly understood from a consideration of the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, wherein like reference letters and numerals indicate the corresponding parts in various figures in the accompanying drawings, and in which:

[0045] FIG. 1 illustrates a perspective view of an applicator head and a cover, in an embodiment of the present utility model.

[0046] FIG. 2 illustrates a cross-sectional view of the applicator head and the cover, in accordance with an embodiment of the present invention.

[0047] FIG. 3 illustrates a perspective view of the applicator head, in accordance with an embodiment of the present invention.

[0048] FIG. 4 illustrates a structural view of a first housing of the applicator head, in accordance with an embodiment of the present invention.

[0049] FIG. 5 illustrates a cross-sectional view of the first housing of the applicator head, in accordance with an embodiment of the present invention.

[0050] FIG. 6 illustrates a top perspective view of the first housing of the applicator head, in accordance with an embodiment of the present invention.

[0051] FIG. 7 illustrates a top perspective view of the first housing of the applicator head, exposing the internal structure of the first housing, in accordance with an embodiment of the present invention.

[0052] FIG. 8 illustrates a side cross-sectional view of the first housing of the applicator head, in accordance with an embodiment of the present invention.

[0053] FIG. 9 illustrates a top perspective view of a sealing member of the applicator head, in accordance with an embodiment of the present invention.

[0054] FIG. 10 illustrates a side perspective view of a sealing member of the applicator head, in accordance with an embodiment of the present invention.

[0055] FIG. 11 illustrates a bottom perspective view of a sealing member of the applicator head, in accordance with an embodiment of the present invention.

[0056] FIG. 12 illustrates a flowchart describing the methodology of the application system of the applicator head, in accordance with an embodiment of the present inventionDETAILED DESCRIPTION

[0057] Embodiments of the present invention disclosure will be described more fully hereinafter with reference to the accompanying drawings in which like numerals represent like elements throughout the figures, and in which example embodiments are shown.

[0058] The detailed description and the accompanying drawings illustrate the specific exemplary embodiments by which the disclosure may be practiced. These embodiments are described in detail to enable those skilled in the art to practice the invention illustrated in the disclosure. It is to be understood that other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the present disclosure. The following detailed description is therefore not to be taken in a limiting sense, and the scope of the present invention disclosure is defined by the appended claims. Embodiments of the claims may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

[0059] Embodiments of the present invention provide a cosmetic application device that includes a specialised applicator head designed for the hygienic, controlled, and multi-functional application of skincare products. In an embodiment, the application head comprises a main body having a first end and a second end, with a liquid supply channel extending between the two ends. The first end is configured to be detachably connected to a container that holds a skincare formulation, such as cream, serum, or lotion. The second end of the main body incorporates a sealing member comprising a fixed portion and an elastically deformable movable portion that regulates the release of the formulation. Additionally, the second end includes one or more rolling grooves in which spherical rolling elements are partially accommodated for massaging and spreading the product onto the skin. A cover body is provided to enclose the second end, pressing against the rolling elements to maintain the sealing function during non-use. The device may further include a bracket, a battery, a circuit board, a vibration motor, and a light therapy lamp housed within the main body, enabling functions such as vibrational massage and phototherapy.In another embodiment of the present

[0060] invention, a method for applying skincare products using the coating device is disclosed. When the cover is removed and the container is squeezed, internal pressure increases within the liquid supply channel, causing the movable portion of the sealing member to deform outward. This deformation opens the outlet passage, allowing the skincare product to flow through the opening adjacent to the rolling elements. As the user moves the applicator head across the skin, the rolling elements rotate and evenly distribute the product, while simultaneously providing massaging action. If equipped, the vibrator may activate to deliver low-frequency vibrations, and the light therapy lamp may emit therapeutic light through a light-transmitting component near the second end. Once pressure is released, the elastic sealing member returns to its original position, automatically resealing the outlet. When the cover is reapplied, it presses the rolling elements inward, further reinforcing the seal and preventing leakage, thereby allowing safe storage and portability of the assembled device.

[0061] Referring to FIG. 1 and FIG. 2, a cosmetic applicator head 100 and a cover 200 are illustrated with the internal components. The applicator head 100 has a first end 348 which is configured to connect to a container (not shown), which holds a skincare product such as eye cream, face cream, lotion, medication liquids, or essence. The second end 314 of the applicator head 100 allows the skincare product to flow out from the container, enabling it to be applied directly to the user's skin. In addition to dispensing, the applicator head 100 may be equipped with a component selected from a group of functional components, such as a stimulation element 336 to enhance the skincare experience. The stimulation element 336 may include but are not limited to, a rolling element 312, a light emitting element 332 (LEDs or laser), a vibrator 182, micro-current electrodes, an ultrasonic wave therapy element, a thermal element, heating or any combination thereof, thereby enabling features such as rolling massage, light therapy, vibration massage, and microcurrent stimulation, etc.

[0062] Referring to FIGS. 1 to 3 and 8 to 10, the applicator head 100 is illustrated, which comprises a main body 300, a sealing member 400, a rolling element 312, and a cover 200. The main body 300 includes a first end 348, a second end 314, and a liquid supply channel 338 that extends through both ends. The first end 348 is positioned at the lower end of the applicator head 100 and configured to be detachably connected to a container holding a skincare formulation. The second end 314 is positioned at the upper end of the applicator head 100. The second end is configured to accommodate a sealing member 400 disposed adjacent to an outlet opening 318 that functions to seal the liquid supply channel 338 at an outlet opening 318 located at the distal end. The sealing member 400 comprises a resilient membrane formed with a pressure-sensitive micro-aperture, a fixed portion 408, which is secured to the second end 314, and a movable portion 406, which is elastically deformable and configured to cover the outlet opening 318. The movable portion 406 is adapted to flex outward relative to the fixed portion 408 when internal pressure is applied, enabling controlled discharge of the product.

[0063] The fixed portion 408 of the sealing member 400 is secured to the second end 314 of the main body 300, while the movable portion 406 is configured to elastically block the outlet opening 318 of the liquid supply channel 338. The movable portion 406 is capable of flexing outward relative to the fixed portion 408 when subjected to internal pressure. A rolling element 312 is positioned at the second end 314 and is rollably mounted to the main body 300, with a portion of the rolling element 312 protruding outward to contact a target surface (user skin). The cover 200 is designed to enclose the second end 314, and when closed, its inner surface abuts the rolling element 312. This causes the rolling element 312 to press inward against the movable portion 406, forcing it into the liquid supply channel 338 and maintaining a sealed state.

[0064] When the cover 200 is removed and the attached container is squeezed, the skincare product flows from the container through the liquid supply channel 338, moving from the first end 348 toward the second end 314. The rolling element 312, when rotated against the user's skin, picks up and evenly applies the dispensed product, facilitating absorption through massaging action.

[0065] During squeezing, the increased internal pressure within the container acts on the movable portion 406, causing it to flex outward (as indicated by arrow X in FIG. 5) and open the outlet, thereby enabling the product to flow out. Once the squeezing action is released, the pressure normalizes, and the movable portion 406 returns to its original shape due to its elastic properties, resealing the outlet opening 318.

[0066] When the cover 200 is replaced, it again pushes the rolling element 312 inward, which in turn applies pressure on the movable portion 406, ensuring that it remains pressed into the liquid supply channel 338. This prevents accidental leakage even if the container is subjected to pressure during transport, making the assembled application device comprising the applicator head 100 and the container convenient and safe for carrying.

[0067] Referring to FIG. 4 and FIGS. 6 to 8, in certain embodiments, the second end 314 of the main body 300 is formed with a pair of rolling grooves 350, which may vary in number. The outlet opening 318 of the liquid supply channel 338 is positioned on the inner wall of these rolling grooves 350. A portion of the rolling element 312 is housed within the rolling groove, while another portion protrudes outward for skin contact. A defined rolling gap is maintained between the rolling element 312 and the groove wall, allowing sufficient clearance for the movable portion 406 of the sealing member 400 to elastically deform and fold outward during operation.

[0068] When the internal pressure in the liquid supply channel 338 exceeds atmospheric pressure, such as when the container is squeezed, the movable portion 406 is pushed outward through the rolling gap, causing it to arch and press against the rolling element 312. This displacement creates a fluid path from the liquid supply channel 338 to the exterior, enabling the skincare product to be dispensed. The inclusion of the rolling groove 350 not only conceals the sealing member 400 within the body structure, enhancing aesthetic and hygienic appeal, but also helps structurally guide the rolling element 312 for smooth contact and pressure application to the skin.

[0069] In alternative embodiments, instead of a spherical rolling element, a shaft-like component may be employed at the second end 314, with the rolling element 312 taking the form of a sleeve that rotates around the shaft.

[0070] Furthermore, the groove wall of the rolling groove 350 may be provided with one or more guide grooves 352. Each guide groove 352 extends from the outlet opening 318 to the open edge or peripheral notch of the rolling groove 350. The guide grooves 352 are particularly beneficial, given the narrow dimensions of the rolling gap, which limit the outward displacement of the movable portion 406. By offering defined flow paths, the guide grooves 352 facilitate smoother discharge of the skincare product, help prevent clogging, and ensure that the liquid flows efficiently toward the region surrounding the rolling element 312 for direct skin application.

[0071] Referring to FIG. 5 and FIG. 9 to FIG. 11, in certain embodiments, the movable portion 406 of the sealing member 400 is defined by two opposing sides: a connecting side 412 and a free side 410. The connecting side 412 is integrally attached to the fixed portion 408, while the free side 410 remains unattached and is positioned closer to the open notch of the rolling groove 350 than the connecting side.

[0072] Taking the vertical orientation as an example (with the X-direction in FIG. 5 indicating the upward direction), the connecting side 412 is situated toward the bottom, and the free side 410 toward the top. The rolling element 312 rests primarily on the lower region of the groove due to gravity, meaning that the rolling force exerted on the connecting side 412 is generally greater than that on the free side 410.

[0073] When the skincare product is forced upward through the liquid supply channel 338, such as during squeezing, the pressure is directed from bottom to top. This orientation allows the free side 410 of the movable portion 406 to open more easily, enabling the skincare product to be discharged smoothly and without obstruction. In this configuration, the sealing mechanism works in concert with fluid dynamics to support efficient and responsive product release.

[0074] Additionally, in this embodiment, the guide groove 352 is positioned near the connecting side 412. This placement facilitates alignment with the outlet opening and supports the channelling of product flow from the liquid supply channel 338 into the rolling groove area, further enhancing dispensing efficiency.

[0075] In certain embodiments, the movable portion 406 of the sealing member 400 comprises a sealing pad 404 and a protrusion 402. The sealing pad 404 is connected to the fixed portion 408 and serves to seal the outlet opening 318 of the liquid supply channel. The protrusion 402 is formed on the side of the sealing pad 404 that faces away from the outlet opening 318, that is, toward the rolling element 312.

[0076] The protrusion 402 is specifically designed to provide a contact point for the rolling element 312. Its presence ensures that when the cover is closed and the rolling element is pressed inward, the force is transmitted to the protrusion 402 rather than directly onto the sealing pad 404. This improves the reliability of the sealing function by enhancing resistance against unintentional outward flexing of the movable portion 406.

[0077] Additionally, as the rolling element 312 rotates during product application, friction occurs between it and the protrusion 402 rather than the sealing pad 404. This design helps protect the sealing pad 404 from mechanical wear, thereby reducing the risk of sealing failure over time.

[0078] The shape of the protrusion 402 is not limited and may vary depending on design needs. It may be formed as an elongated strip, a cylinder, a dome, a sphere, or other suitable geometries. Furthermore, one or more such protrusions may be provided to optimize contact, sealing performance, and rolling behaviour.

[0079] Since the sealing member 400 is made from an elastic material such as silicone or rubber, its surface typically has a slightly rough texture. If the sealing member 400 protrudes excessively into the rolling groove 350, it may interfere with the motion of the rolling element 312, causing it to roll unevenly or become obstructed.

[0080] To ensure smooth and consistent rolling of the rolling element 312, the surface of the sealing member 400 that faces away from the outlet opening 318 is configured to be flush with the groove wall of the rolling groove 350. Specifically, the sealing pad 404, comprising both the fixed portion 408 and the movable portion 406, does not extend into the rolling groove. This recessed arrangement minimizes surface contact between the rolling element 312 and the elastic material, thereby reducing rolling resistance and friction.

[0081] Instead, only the protrusion 402 extends into the rolling groove 350. This strategic positioning serves two important purposes: first, it provides a localized point of support and contact for the rolling element 312, ensuring that the rolling motion is controlled and unimpeded; second, it maintains a physical gap between the rolling element 312 and the sealing pad 404, which helps prevent wear on the sealing surface. This configuration enhances the durability of the sealing member 400, ensures a smooth user experience, and allows the rolling element 312 to effectively transmit pressure onto the movable portion 406 during sealing and dispensing operations.

[0082] Referring again to FIGS. 5 to 8, in some embodiments, the second end 314 of the main body 300 is provided with a receiving groove 354 designed to accommodate the fixed portion 408 of the sealing member 400. This receiving groove 354 enables precise positioning and secure installation of the fixed portion 408, minimizing the likelihood of displacement or misalignment during use.

[0083] To further enhance stability, the fixed portion 408 may be affixed to the main body 300 using adhesive bonding in addition to the mechanical fit within the receiving groove 354. This dual retention method ensures that the sealing member remains reliably secured, even under repeated elastic deformation caused by pressure changes during product dispensing.

[0084] Once the receiving groove 354 is incorporated, the outer surface of the fixed portion 408 can be aligned flush with the internal wall of the rolling groove 350, creating a seamless transition that does not interfere with the operation of the rolling element 312. In some embodiments, the receiving groove 354 is formed directly into the groove wall of the rolling groove 350, further simplifying the design and maintaining compactness while improving integration of the sealing mechanism within the structure of the applicator head 100.

[0085] In certain embodiments, the groove wall of the receiving groove 354 features a concave-convex surface profile, and the fixed portion 408 of the sealing member 400 is correspondingly shaped to match this contour. Specifically, the side surface of the fixed portion 408 is also formed with complementary concave-convex features, allowing it to interlock securely with the receiving groove 354. This interlocking design enhances positional stability and helps prevent unwanted rotation or loosening of the sealing member during operation.

[0086] To further ensure that the sealing member 400 remains properly secured, especially at the interface between the fixed portion 408 and the movable portion 406, the portion of the receiving groove 354 that communicates with the outlet opening 318 may be formed with a constricted section 324. The constricted section 324 creates a defined step surface 316 at the boundary between the wider receiving groove 354 and the narrower opening. The edge of the fixed portion 408 is designed to abut against this step surface 316, thereby limiting axial movement and ensuring that the sealing member stays in place even under repeated pressure fluctuations.

[0087] Additionally, the rolling element 312 is configured as a spherical body, and the rolling groove 350 is shaped as a substantially spherical cavity. The rolling groove 350 is formed deeper than a hemisphere but not as deep as a full sphere. This geometry allows a portion of the rolling element 312 to project outward for effective skin contact while also ensuring that the rolling element remains securely retained within the groove. The narrow opening or notch at the top of the rolling groove 350 prevents the rolling element 312 from escaping during use, maintaining both functionality and safety.

[0088] Referring to FIG. 2, in certain embodiments, the main body 300 of the applicator head 100 includes a housing 320, a bracket 340, a battery 344, and a circuit board 342. The housing 320 defines an inner cavity 322 that extends axially through the body. Within this inner cavity 322, the bracket 340, battery 344, and circuit board 342 are mounted in a compact and organized manner.

[0089] The inner cavity 322 is closed at one end and open at the other. The closed end corresponds to the second end 314 of the applicator head, while the open end defines the first end 348. At the first end, a threaded housing 346 is provided, which includes an internal thread configured to couple or engage with a corresponding threaded neck of a container. This arrangement allows for a secure and detachable connection between the applicator head 100 and the container holding the skincare product.

[0090] Alternatively, the internal thread may be formed directly within the open end of the housing itself, without requiring a separate threaded component. In another variation, the open end may be designed as a sleeve-type fitting that can be press-fitted or snap-fitted directly onto the container, depending on the intended product packaging.

[0091] The housing 320 of the main body 300 may be formed as a single integral structure or, in some embodiments, as illustrated in FIG. 2, may be composed of multiple assembled components, such as a first housing 310 and a second housing 330. The second housing 330 features a through-channel extending between both ends, forming the inner cavity 322 where the internal components are housed.

[0092] The first housing 310 is configured to cover one end of the second housing 330 and serves as the interface for accommodating and positioning the rolling element 312. The first housing 310 may be affixed to the second housing 330 by bonding (e.g., with adhesive), or alternatively, the two components may be snap-fit together. In such cases, a sealing ring may optionally be placed between the housings to ensure a fluid-tight connection and to prevent leakage of the skincare product.

[0093] The bracket 340 is secured to the inner wall of the housing 320 and serves as the mounting platform for stimulation element 336. The battery 344 and the circuit board 342 are both installed on the bracket 340, ensuring stable positioning and electrical connectivity. Additionally, a vibrator 334 is mounted on the circuit board 342. Upon activation, the vibrator 334 generates mechanical vibrations, contributing to enhanced skincare effects such as massage and product absorption.

[0094] In an embodiment, the stimulation element 336 includes at least one light-emitting element 332 strategically positioned within the main body 300 to deliver therapeutic light directly to the user's skin. The light-emitting element 332 is mounted on the bracket 340, which is fixed within the inner cavity 322 of the second housing 330. The bracket 340 is electrically connected to the circuit board 342 and powered by the battery 344, forming a compact and integrated stimulation module. The light-transmitting component at the second end 314, which may include the first housing 310 or the wall of the rolling groove 350, allows the light emitted by the light-emitting element 332 to reach the skin surface. In some embodiments, the rolling element 312 is fabricated from a transparent or translucent material, permitting light to pass through it while simultaneously rolling on the skin. Alternatively, the light may be guided around the rolling element 312 through optical pathways, ensuring uniform and effective irradiation of the treatment area.

[0095] The light-emitting element 332 may comprise one or more LEDs configured to emit specific wavelengths of light selected for their dermatological benefits. In some embodiments, the LED may emit blue light (approximately 415 nm) to combat acne by targeting acne-causing bacteria near the skin’s surface. Red light (approximately 630-660 nm) may be used to stimulate collagen production and improve skin elasticity, while green light (approximately 520-550 nm) may help reduce pigmentation and even out skin tone. Additionally, the light-emitting element 332 may emit infrared or near-infrared (NIR) light (approximately 850-1100 nm) to penetrate deeper skin layers for improving circulation and reducing inflammation. The integrated structure enables delivery of one or multiple light types either sequentially or simultaneously, providing multifunctional phototherapy in a single, compact applicator head.

[0096] In an embodiment, the stimulation element 336 may be a pair of microcurrent electrodes configured to deliver low-level electrical stimulation to the user’s skin for therapeutic benefits such as collagen stimulation, enhanced product absorption, and facial toning. The microcurrent electrodes may be positioned on the outer surface of the first housing 310, near the second end 314, and arranged adjacent to the rolling grooves 350 to ensure consistent skin contact during use. The rolling element 312 itself may be formed from or coated with a conductive material and functions dually as a microcurrent electrode, enabling simultaneous rolling massage and electrical stimulation. The electrodes are electrically connected to the circuit board 342 and powered by the battery 344, with stimulation control managed through an onboard microcontroller that regulates microcurrent intensity and pulse patterns. The system can deliver currents in the range of 10-500 μA, adjustable in intensity and frequency to address different treatment goals such as ATP production, muscle toning, or lymphatic drainage. Stimulation may be triggered manually via a switch or automatically through skin contact or pressure, allowing for real-time, dynamic therapy during product application and massage.

[0097] In an embodiment, the stimulation element 336 may be a heating and / or cooling element configured to provide thermal stimulation to the skin surface for enhanced cosmetic and therapeutic effects. The thermal element may be embedded within the first housing 310 or mounted on the bracket 340 near the second end 314, allowing heat or cold to be conducted efficiently to the skin-contacting region of the applicator. In some embodiments, the rolling element 312 itself may be made from or coupled with a thermally conductive material and function as the surface through which heating or cooling is delivered. Heating and cooling therapy may be provided using thermoelectric elements, most notably semiconductor refrigerators such as Peltier modules, which operate based on the Peltier effect. When electric current passes through these semiconductor junctions, one side of the module absorbs heat (providing a cooling effect) while the opposite side releases heat (providing a heating effect). By reversing the current direction, the heating and cooling sides are switched, allowing precise bidirectional thermal control. The thermal element is electrically connected to the circuit board 342 and powered by the battery 344, with integrated temperature sensors and control circuitry allowing for precise regulation of surface temperature, typically within the range of 5°C to 45°C. Heating may be used to open pores, increase blood circulation, and promote deeper absorption of skincare formulations, while cooling can help soothe irritated skin, reduce puffiness, and tighten pores.

[0098] In an embodiment, the applicator head 100 includes a vibrator 334 configured to generate mechanical vibrations that enhance the effectiveness of skincare treatment by promoting blood circulation, improving product absorption, and providing a soothing massage effect. The vibrator 334 is mounted on the circuit board 342, which is fixed to the bracket 340 inside the inner cavity 322 of the applicator's second housing 330. When activated, the vibrator 334 transmits oscillatory motion through the main body 300 to the second end 314, where it is directly felt on the skin via the rolling element 312 and the surrounding housing. The vibrator 334 may be a piezoelectric element or a motor (e.g., eccentric rotating mass or linear resonant actuators). The vibration intensity and frequency are controlled via the circuit board 342 and powered by the battery 344, with frequencies typically ranging from low-frequency pulses (around 100 Hz) to higher-frequency vibrations (up to several kHz) depending on the treatment mode. The vibration function may be manually activated via a user-operated switch or automatically triggered upon skin contact or device movement, enabling a multifunctional application experience that combines massage, fluid dispensing, and additional therapeutic modalities.

[0099] The vibrator 334 is implemented as a vibration motor mounted on the circuit board 342. In addition to the vibrator 334, the bracket 340 also supports a light-emitting element 332. The light-emitting element 332 is positioned near the second end 314 of the applicator head, which is formed of a light-transmitting component. This allows the emitted light to pass through the second end 314 and be applied directly to the skin for therapeutic purposes.

[0100] Optionally, the first housing 310 may also be constructed from a light-transmitting material to further permit the output of therapeutic light. The light-emitting element 332 may emit various types of light, including but not limited to red light, blue light, purple light, and infrared light, each selected based on the intended skincare benefit, such as soothing, anti-inflammation, or collagen stimulation.

[0101] The liquid supply channel 338 that transports skincare product from the container to the outlet opening can be configured in two connected sections. One section is formed within the bracket 340, while the other section is defined by the inner structure of the first housing 310. The first housing 152 has a plate-like external shape to cover the second housing 330, and its inner surface may be shaped as a tubular passage to form part of the continuous liquid supply channel 338. Alternatively, in some embodiments, the entire liquid supply channel 338 may be formed solely within the bracket 340.

[0102] In certain embodiments, the housing 320, specifically the first housing 310, includes the second end 314, wherein a portion of the second end 314 is recessed inward to form one or more rolling grooves 350. The second end 314 is configured with multiple such rolling grooves 350, and a rolling element 312 is housed within each groove. The outlet opening 318 of the liquid supply channel 338 is positioned within the groove wall of at least one of these rolling grooves, allowing the skincare product to be dispensed directly adjacent to the rolling element.

[0103] Optionally, the first housing 310 is manufactured as a plastic component, and the rolling grooves 350 may be integrally formed via injection molding. In this configuration, the inner wall of the first housing 310 includes inward projections that correspond precisely to the recessed shapes of the rolling grooves 350, ensuring structural integrity and dimensional consistency across all application points.

[0104] The end surface of the first housing 310 is inclined, and multiple rolling grooves 350 are arranged along this inclined surface, spaced sequentially from top to bottom. As a result, each rolling element 312 housed within these grooves is also positioned at an inclined angle relative to the horizontal plane. This slanted arrangement aligns more naturally with the contours of the human face.

[0105] When the user holds the applicator head 100, the angled orientation of the rolling elements 312 allows for smoother and more comfortable contact with the skin. This design not only enhances the effectiveness of product application and massage but also improves ergonomics by enabling the user to hold and manoeuvre the applicator head at a relaxed and natural angle.

[0106] In some embodiments, the liquid supply channel 338 is routed such that it passes beneath or through the upper rolling groove 350. When two rolling grooves 350 are present, the liquid supply channel 338 is preferably positioned centrally between them, ensuring even distribution of the skincare product to both application points.

[0107] The rolling element 312 is typically a spherical body, such as a steel ball, designed for smooth rotational movement. The inner wall of the cover 200 is configured to contact the rolling element 312 directly when the cover is closed. Alternatively, a convex portion 210 may be formed on the inner surface of the cover 200 to ensure consistent contact with the rolling element 312.

[0108] In one optional design, the convex portion 210 is shaped as an annular (ring-like) protrusion. This ensures that, regardless of the rotational orientation of the cover 200 when it is applied to the main body 300, the convex portion 210 will reliably press against the rolling element 312. This configuration enhances sealing performance by applying inward pressure that helps secure the sealing member and prevents unintended fluid leakage.

[0109] Referring to FIG. 12, a flowchart 1200 is disclosed, which illustrates the methodology for applying a liquid to a target surface using the applicator head 100.

[0110] At step 1202, the method begins with the initiation of the skincare application process using the multifunctional applicator system.

[0111] At step 1204, an applicator head 100 is provided, the applicator head comprising a cover 200 and a main body 300. The main body 300 includes a first end 348 configured to be coupled to the container and a second end 314 for dispensing. A liquid supply channel 338 extends from the first end to the second end, allowing the skincare product contained within the container to flow toward the outlet for application onto a target surface.

[0112] At step 1206, at least one rolling element 312 is positioned at the second end 314 of the applicator head 100. The rolling element 312 is configured to rotate freely and to contact the target surface, typically the user’s skin, thereby facilitating the smooth and even application of the skincare product. A sealing member 400 is positioned adjacent to an outlet opening 318 of the liquid supply channel 338. The sealing member 400 includes a fixed portion 408 and an elastically deformable movable portion 406, which remains normally closed to prevent leakage and opens when internal pressure is applied, thus regulating the flow of liquid through the outlet.

[0113] At step 1208, pressure is applied to the container or the applicator head is actuated, such as by squeezing the container. This pressure is transmitted through the liquid supply channel 338, causing the movable portion 406 of the sealing member 400 to elastically deform and open the outlet opening 318. This enables controlled dispensing of the skincare formulation.

[0114] At step 1210, the user rolls the rolling element 312 across the target surface. As the rolling element moves, it evenly distributes the dispensed liquid, provides massaging action, and enhances the absorption of the product into the skin.

[0115] At step 1212, optionally, a light-emitting element 332 is activated to emit therapeutic light. This light may pass through the light-transmitting rolling element 312 or surrounding transparent sections of the housing to reach the skin. The emitted wavelengths may include red, blue, green, or near-infrared light, each selected based on specific skin treatment needs such as acne reduction, collagen stimulation, or pigmentation balancing.

[0116] At step 1214, the method may further comprise the activation of one or more stimulation elements 336 provided in the applicator head 100. These elements may include microcurrent electrodes, piezoelectric elements, ultrasonic wave emitters, thermal elements, or vibrators 334, which are configured to enhance skin treatment through additional therapeutic modalities.

[0117] At step 1216, in some embodiments, the system includes sensors or pressure-sensitive controls that detect user-applied pressure during use. Upon detection, the stimulation elements are automatically actuated to deliver real-time therapy (e.g., microcurrent or vibration) in coordination with the rolling application of the skincare product.

[0118] At step 1218, in some embodiments, a cover 200 is placed over the second end 314 of the applicator head 100. The cover body includes a convex portion 210 which abuts the rolling element 312 and transmits force to the movable portion 406 of the sealing member 400, pressing it inward to seal the outlet opening 318 and prevent fluid leakage during storage or non-use.

[0119] At step 1220, the method concludes once the desired quantity of product is applied and the therapeutic actions are complete, thereby ending the skincare treatment cycle using the applicator head 100.

[0120] The present invention provides a multifunctional applicator head that integrates precise fluid control, hygienic sealing, and enhanced user experience through features such as rolling application, light therapy, micro-current therapy, ultrasonic wave therapy, heating or cooling therapy, piezoelectric therapy, and vibration therapy. Its compact and ergonomic design makes it highly suitable for incorporation into a wide range of skincare and cosmetic packaging systems. The sealing mechanism prevents leakage during storage and transport, while the modular structure allows for efficient mass production using standard plastic injection molding and assembly techniques. As such, the invention is well-suited for industrial-scale application in the beauty, personal care, and wellness sectors, where user convenience, product preservation, and treatment efficacy are essential. The application device can be adapted for both high-end cosmetic products and daily skincare routines, offering versatility and commercial value across diverse market segments.

[0121] Various modifications to these embodiments are apparent to those skilled in the art from the description and the accompanying drawings. The principles associated with the various embodiments described herein may be applied to other embodiments. Therefore, the description is not intended to be limited to the embodiments shown along with the accompanying drawings but is to provide the broadest scope consistent with the principles and the novel and inventive features disclosed or suggested herein. Accordingly, the invention is anticipated to hold on to all other such alternatives, modifications, and variations that fall within the scope of the present invention and appended claims.

Claims

1. An applicator head comprising: a main body having a first end configured to be coupled to a container and a second end; a liquid supply channel extending through the main body from the first end to the second end; a sealing member disposed adjacent to an outlet opening of the liquid supply channel, the sealing member comprising a fixed portion and a movable portion, the movable portion being elastically deformable relative to the fixed portion and configured to selectively open or close the outlet opening; at least one rolling element rotatably positioned at the second end and configured to contact a target surface; and a cover body configured to enclose at least part of the second end and comprising a protrusion positioned to abut the rolling element and transmit force to the movable portion of the sealing member to prevent liquid flow.

2. The applicator head of claim 1, wherein the cover body comprises at least one protrusion configured to engage with the rolling element and push the rolling element into sealing contact with the movable portion of the sealing member when the cover body is placed, thereby preventing fluid leakage during non-use.

3. The applicator head of claim 1, wherein the sealing member is normally closed and opens in response to pressure applied by a user to the container.

4. The applicator head of claim 1, wherein the movable portion of the sealing member comprises a pad and a protrusion extending toward the rolling element.

5. The applicator head of claim 4, wherein the protrusion is arranged to be engaged by the rolling element during rotation.

6. The applicator head of claim 1, wherein the second end comprises a rolling groove for housing the rolling element, and wherein the outlet opening of the liquid supply channel is located on a groove wall of the rolling groove.

7. The applicator head of claim 6, wherein a rolling gap is defined between the rolling element and the groove wall, the rolling gap configured to accommodate elastic deformation of the movable portion.

8. The applicator head of claim 6, wherein the second end includes a guide groove extending from the outlet opening toward a peripheral notch of the rolling groove.

9. The applicator head of claim 1, wherein the sealing member is secured within a receiving groove formed in the second end of the main body.

10. An applicator head comprising: a main body having a first end configured to be coupled to a fluid container and a second end; a liquid supply channel extending from the first end to the second end; at least one rolling element disposed at the second end and configured to contact a target surface; at least one light-emitting element disposed within the main body and configured to emit light toward the target surface; a light-transmitting component disposed between the light-emitting element and the rolling element, the light-transmitting component being configured to guide light emitted by the light-emitting element toward the target surface through the rolling element; anda sealing member positioned at an outlet opening of the liquid supply channel and configured to regulate fluid flow.

11. The applicator head of claim 10, wherein the light-emitting element comprises at least one LED configured to emit visible, ultraviolet, or infrared light.

12. The applicator head of claim 10, wherein the rolling element comprises a light-transmitting material to permit light from the light-emitting element to reach the target surface.

13. The applicator head of claim 10, wherein the sealing member comprises a fixed portion and a movable portion, the movable portion is elastically deformable relative to the fixed portion and configured to selectively open or close the outlet opening.

14. The applicator head of claim 13 further comprises a cover body having at least one protrusion positioned to abut the rolling element and transmit force to the movable portion of the sealing member to prevent liquid flow.

15. A method of applying a liquid to a target surface using an applicator head, the method comprising:  providing an applicator head having a main body with a first end configured to be coupled to a container, a second end, and a liquid supply channel extending from the first end to the second end; providing a sealing member adjacent to an outlet opening of the liquid supply channel, the sealing member comprising a fixed portion and a movable portion; positioning at least one rolling element at the second end of the applicator head such that the rolling element is rotatable and contacts the target surface; applying pressure to the container or actuating the applicator head to elastically deform the movable portion of the sealing member and open the outlet opening to dispense the liquid; and rolling the at least one rolling element across the target surface to apply the dispensed liquid.

16. The method of claim 15, further comprising: placing a cover body over the second end of the applicator head, the cover body comprising a protrusion configured to abut the rolling element and transmit force to the movable portion of the sealing member to seal the outlet opening and prevent leakage during non-use.

17. The method of claim 16, wherein the cover body encloses the second end to seal and prevent accidental actuation or contamination of the rolling element and outlet opening during storage.

18. The method of claim 15, further comprising activating a light-emitting element disposed within the applicator head to emit therapeutic light through a light-transmitting rolling element toward the target surface during application.

19. The method of claim 15, further comprising providing one or more therapies to a user by providing at least one stimulation element in the applicator head.

20. The method of claim 19, further comprising detecting user-applied pressure and actuating at least one stimulation element in response to the pressure.

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