Makeup applicator and cosmetic bag

Abstract

The present disclosure relates to a makeup applicator and a cosmetic bag device, the makeup applicator can include a substantially flat base; a porous flexible body; and an application outer layer comprising at least a flat portion and at least a curved portion, the curved portion being circumferentially arranged around the at least a flat portion; wherein the peripheral edge of the base and the peripheral edge of the application outer layer are connected and jointly define a receiving space for accommodating the flexible body. The makeup applicator is configured to conform to various human skin contours with curvature, including but not limited to the contours around the eyes, face, and neck. The cosmetic bag can primarily include an upper portion, a lower portion, and a zipper mechanism connecting the two. The upper portion and the lower portion together form the overall structure of the cosmetic packaging device.

Description

Makeup Applicator and Cosmetic BagThis international application claims the benefit of priority to U.S. Patent Application No.19 / 031,336, filed January 18, 2025, which is expressly incorporated herein by reference.FIELD OF THE INVENTION

[0001] The present disclosure relates to the technical field of cosmetics, and more particularly, to a makeup applicator and a cosmetic bag.BACKGROUND OF THE INVENTION

[0002] Makeup applicators and cosmetic bags are daily cosmetic tools. A makeup applicator is used to pick up and evenly apply dry or wet textured cosmetics such as foundation or loose powder. Some makeup applicators are made of sponge or plush materials, which facilitate powder pickup and improve adhesion. Through gentle patting or pressing, users can distribute powder evenly across the face for modification and concealing. To enhance powder pickup, extend service life, and improve makeup efficiency, various innovative solutions have been proposed. For example, micro-pores or composite materials can be added to improve the comfort of the makeup applicator.SUMMARY OF THE INVENTION

[0003] At least in view of the circumstances concerning makeup applicators described above, the non-limiting exemplary embodiments of the present disclosure provide a makeup applicator, which can include a substantially flat base; a porous flexible body; and an application outer layer comprising at least a flat portion and at least a curved portion, the curved portion being circumferentially arranged around said at least a flat portion; wherein the peripheral edge of the base and the peripheral edge of the application outer layer are connected and jointly define a receiving space for accommodating the flexible body; wherein at least a portion of the curved portion of the application outer layer comprises a group of curved surfaces, the group of curvedsurfaces comprising three types of gaussian surfaces, and the product of the gaussian curvatures of any two adjacent surfaces in the group of curved surfaces is not greater than zero. This makeup applicator can at least conform to various human-body curved skin contours, including but not limited to the eye area, the face perimeter, and the neck. It can also be used for concealing — e.g., for covering dark circles and eye bags.

[0004] The present non-limiting exemplary disclosure further provides another makeup applicator that can include a substantially flat base; a porous flexible body; and an application outer layer comprising at least a flat portion and at least a curved portion, the curved portion being circumferentially arranged around said at least a flat portion; wherein the peripheral edge of the base and the peripheral edge of the application outer layer are connected and jointly define a receiving space for accommodating the flexible body; wherein at least a portion of the curved portion of the application outer layer comprises a group of curved surfaces that includes at least one saddle surface. This makeup applicator can at least conform to various human-body curved skin contours, including but not limited to the eye area, the face perimeter, and the neck. It can also be used for concealing — e.g., covering dark circles and eye bags.

[0005] Further, the present non-limiting exemplary disclosure provides yet another makeup applicator that can include a substantially flat base; a porous flexible body; and an application outer layer comprising at least a flat portion and at least a curved portion, the curved portion being circumferentially arranged around said at least a flat portion; wherein the peripheral edge of the base and the peripheral edge of the application outer layer are connected and jointly define a receiving space for accommodating the flexible body; wherein at least a portion of the curved portion of the application outer layer comprises a group of curved surfaces that defines a first type of operating region and a second type of operating region, the first type of operating region and the second type of operating region being configured so as to simultaneously perform makeup application actions on the user’ s under-eye area and nasal root area. This makeupapplicator can at least conform to various human-body curved skin contours, including but not limited to the eye area, the face perimeter, and the neck. It can also be used for concealing — e.g., to cover dark circles and eye bags.

[0006] The present non-limiting exemplary disclosure further provides an cosmetic bag or storage box, which can primarily include an upper portion, a lower portion, and a zipper device connecting the two. The upper portion and the lower portion together form the overall structure of the cosmetic bag, where the upper portion serves as the upper shell and is made of lightweight yet sturdy material, designed with a curved surface to enhance aesthetics and user comfort. In use, the cosmetic bag is mainly for storing various makeup devices — for example, makeup applicators, makeup brushes, eyeshadow palettes, lipsticks, and other cosmetics. The interior of the cosmetic bag can include partition structures or elastic pockets for classified storage of these makeup devices, preventing damage or contamination caused by disorganized stacking.BRIEF DESCRIPTION OF THE DRAWINGS

[0007] To make the technical solutions in certain non-limiting embodiments of the present disclosure clearer, a brief introduction of the accompanying drawings referenced in the descriptions of various embodiments is provided below. Evidently, these drawings only depict some of the embodiments disclosed herein, and those skilled in the art can derive other drawings from them without inventive effort.

[0008] FIG. l is a perspective view of a makeup applicator in an embodiment of the present disclosure;

[0009] FIG. 2 is another perspective view of a makeup applicator in an embodiment of the present disclosure;

[0010] FIG. 3 is an exploded perspective view of a makeup applicator’s structure in an embodiment of the present disclosure;

[0011] FIG. 4 is another exploded perspective view of the makeup applicator’s structure in an embodiment of the present disclosure;

[0012] FIG. 5 is a projection view of the makeup applicator in an embodiment of the present disclosure;

[0013] FIG. 6 is a cross-sectional view of the makeup applicator of FIG. 5 taken along section line Hl -Hl;

[0014] FIG. 7 is a cross-sectional view of the makeup applicator of FIG. 5 taken along section line H2-H2;

[0015] FIG. 8 is a cross-sectional view of the makeup applicator of FIG. 5 taken along section line H3-H3;

[0016] FIG. 9 is yet another perspective view of the makeup applicator in an embodiment of the present disclosure;

[0017] FIG. 10 is another perspective view of the makeup applicator in an embodiment of the present disclosure;

[0018] FIG. 11 is a schematic figure illustrating a makeup application operation of the makeup applicator in an embodiment of the present disclosure;

[0019] FIG. 12 is a schematic figure illustrating another makeup application operation of the makeup applicator in an embodiment of the present disclosure;

[0020] FIG. 13 is a projection view of the makeup applicator in an embodiment of the present disclosure;

[0021] FIG. 14 is a projection view of the makeup applicator in an embodiment of the presentdisclosure;

[0022] FIG. 15 is another projection view of the makeup applicator in an embodiment of the present disclosure;

[0023] FIG. 16 is a perspective view of the makeup applicator in an embodiment of the present disclosure;

[0024] FIG. 17 is a front view of the makeup applicator of FIG. 16;

[0025] FIG. 18 is a rear view of the makeup applicator of FIG. 16;

[0026] FIG. 19 is a left-side view of the makeup applicator of FIG. 16;

[0027] FIG. 20 is a right-side view of the makeup applicator of FIG. 16;

[0028] FIG. 21 is a top view of the makeup applicator of FIG. 16;

[0029] FIG. 22 is a bottom view of the makeup applicator of FIG. 16.

[0030] FIG. 23 is a perspective view of a cosmetic bag in an embodiment of the present disclosure;

[0031] FIG. 24 is an exploded perspective view of the cosmetic bag in an open configuration in an embodiment of the present disclosure;

[0032] FIG. 25 is another exploded perspective view of the cosmetic bag in an open configuration in an embodiment of the present disclosure;

[0033] FIG. 26 is a perspective view of the internal storage box of the cosmetic bag in an embodiment of the present disclosure;

[0034] FIG. 27 is yet another perspective view of the internal storage box of the cosmetic bag in an embodiment of the present disclosure.DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0035] In order for the objectives, features, and advantages of the present disclosure to become more apparent and comprehensible, detailed descriptions of specific embodiments / non-limiting exemplary embodiment of the present disclosure are provided below with reference to the accompanying drawings. Many specific details are recited in the following description to facilitate a full understanding of the present disclosure. However, the present disclosure can be practiced in numerous other manners different from those described herein, and those skilled in the art can make similar improvements to achieve the same or similar functional effects without departing from the spirit of the present disclosure. Hence, the present disclosure — especially the claims addressed herein — is not limited by the non-limiting embodiments described below.

[0036] In the description herein, it should be understood that the terms “center,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” “counterclockwise,” “axial,” “radial,” “circumferential,” “oblique,” and the like, if they appear, can be interpreted based on the orientations or positions shown in the drawings. These terms are used for convenience in describing the present disclosure and simplifying its explanation, rather than indicating or implying that the device or element in question must be in a specific orientation or constructed and operated in a specific orientation. Hence, such terms must not be regarded as limiting the present disclosure.

[0037] Additionally, if the terms “first,” “second,” or similar are used, they serve only a descriptive purpose and must not be understood as suggesting relative importance or implicitly indicating the number of features described. Consequently, any feature qualified by “first” or “second” can explicitly or implicitly include at least one such feature. In the descriptions herein, if the term “plurality” appears, it refers to at least two, such as two or three, unless otherwise specifically defined.

[0038] Moreover, unless otherwise expressly stipulated and defined, the action-related terms used herein — such as “coupled,” “mounted,” “connected,” “fixed,” “fitted,” “provided,” and “positioned,” as well as “configured” or “arranged” — should be interpreted broadly in alignment with the concept of the present disclosure. For instance, it can encompass direct or indirect implementations, permanent or removable implementations, or implementations that allow flexibility (e.g., a hinge). Taking “connected” as an example, it can mean either direct or indirect connections through an intermediate component, and it can mean a fixed or movable connection. Similarly, “fixed” can include at least two forms: permanently or detachably fixed.

[0039] In the present disclosure, unless otherwise stated and defined, references to “the first feature is on or under the second feature,” or the like, can mean direct contact or indirect contact via an intermediary. Also, “the first feature is on / above / upward of the second feature” can mean directly or diagonally above, or that the first feature’s horizontal height is simply greater than that of the second. Likewise, “the first feature is below / under / downward of the second feature” can similarly mean directly or diagonally below, or that the first feature’s horizontal height is simply less than that of the second.

[0040] Referring to FIGS. 1-8, one non-limiting exemplary embodiment of the present disclosure provides a makeup applicator 10, which can also be called a powder applicator, powder puff, beauty sponge, or applicator tool. The makeup applicator 10 can be used for applying various types of cosmetics, such as loose powder, pressed powder, liquid foundation, concealer, cushion foundation, BB cream / CC cream, cream blush, contour / highlighter cream, concealer cream, cream foundation, sunscreen, lotion / emulsion, body powder, color cosmetics, and oil-based cosmetics (e.g., lip balm). In some non-limiting exemplary embodiment, from a stacking standpoint, the makeup applicator 10 can include a cap-like application outer layer 100 (a top layer), a porous flexible body 200 (a middle layer), and a substantially planar / flat base 300 (a bottom layer). The application outer layer 100 can define a receiving space S. The peripheral edge of the base 300 can be connected (e.g., by heat bonding, adhesive, or compression sealing)to the bottom peripheral edge of the application outer layer 100, further forming a sealed receiving space S. The flexible body 200 can be movably contained therein and substantially fill that receiving space S.

[0041] Additionally, the makeup applicator 10 can have or define a longitudinal direction Y, a transverse direction X, and a vertical direction Z, as illustrated by reference directions. These directions will be used in describing the makeup applicator 10. Further, the longitudinal direction Y can be referred to as the top-bottom direction of the makeup applicator 10, the transverse direction X can be referred to as the left-right direction of the makeup applicator 10, and the vertical direction Z can be referred to as the thickness direction of the makeup applicator 10. The longitudinal direction Y can also be called the Y reference axis, the transverse direction X the X reference axis, and the vertical direction Z the Z reference axis.

[0042] In some non-limiting exemplary embodiment, the application outer layer 100 can also be called the applicator surface, top layer, or surface layer, and is primarily used for three functions or makeup actions: (1) picking up cosmetics (“powder pickup”), (2) moderately absorbing cosmetics, and (3) releasing or delivering the adsorbed or picked-up cosmetics onto the user’s skin (“powder release”). There is no special limitation on materials for making the applicator surface 100, for example they exhibit skin-friendliness and oil resistance.Non-limiting exemplary embodiments include polyurethane (PU), latex, silicone, velour, microfiber, activated carbon, sponge, cotton, rubycell, or suitable combinations thereof. To implement powder pickup and release, the material of the applicator surface 100 can incorporate appropriate micro-pores (not shown), which can be uniformly distributed over the surface of the applicator surface 100. Typically, these micro-pores have diameters between about 200 pm and 0.1 mm. They can have open ends on the outer surface 102 of the applicator surface 100 to facilitate cosmetic pickup and uniform release, while in the interior or bottom, some can be closed-cell to prevent excessive penetration (e.g., into the flexible body 200), reducing waste. In effect, these micro-pores form small cavities that store powder or liquid foundation, which canbe released onto the user’s skin upon compression of the makeup applicator 10. Moreover, the thickness W1 of the application outer layer / applicator surface 100 (e.g., from its inner surface 101 to its outer surface 102) is generally between 1 mm and 6 mm. Preferably, this thickness is uniformly distributed so that any local portion of the applicator surface 100 has a substantially consistent thickness, ensuring consistent makeup performance in terms of powder pickup and release, no matter which region is used.

[0043] In some non-limiting exemplary embodiments (FIG. 6), the porous flexible body 200 can be made of a variety of materials, mainly open-cell polyurethane foam, natural sponge, polyurethane sponge, rubber sponge, polyethylene sponge, etc., or their appropriate combination. As a middle layer, it primarily provides the overall elasticity and support for the makeup applicator 10. When the user does not press or squeeze the makeup applicator 10, the flexible body 200 furnishes enough elasticity to keep the makeup applicator 10 in a first, naturally expanded (bulging) state; upon pressing or squeezing, it compresses into a second state, still offering adequate elasticity. The flexible body 200 can itself be formed from a sponge with porosity (pores not shown) larger on average than the micro-pores of the applicator surface 100, thereby better facilitating elastic expansion and compression while significantly reducing weight. The difference in pore size underscores the difference in function: the applicator surface 100 is mainly for pickup and release, whereas the flexible body 200 provides elastic expansion / compression. Additionally, the average thickness W2 of the flexible body 200 (e.g., along the Z-axis) can be about 0.3 cm to 5 cm.

[0044] In a preferred embodiment, the ratio R1 of the average thickness W 1 of the application outer layer 100 to the average thickness W2 of the flexible body 200 lies between about 1 / 8 and 1 / 3. This ratio is determined because tests show that if the application outer layer 100 is too thick, uniform powder pickup and release can be adversely affected; if too thin, application becomes uneven or wears out quickly. Furthermore, if the thickness design of the makeup applicator is suboptimal and the middle sponge body 200 does not provide sufficient cushioning, theapplicator can lack elasticity or a good hand feel during use. If the outer PU layer 100 is too thin, it can tear from frequent usage; if too thick, cost goes up and powder release is impaired.Specifically, when R1 < 1 / 8, the middle sponge layer is too thin, yielding poor elasticity during pressing and thus a subpar application experience; when R1 > 1 / 3, the outer PU becomes too thick, raising overall hardness and diminishing softness. Hence, setting R1 between 1 / 8 and 1 / 3 ensures improved application uniformity, comfort, and durability, while keeping manufacturing cost and cleaning convenience within reason.

[0045] In some non-limiting exemplary embodiments, the substantially flat base (or bottom layer) 300 can provide a certain level of hardness and support for the entire makeup applicator 10, preserving its overall shape. The base 300’s material is not especially limited; commonly it can be polyurethane leather (polyurethane coated on a substrate such as knit or non-woven fabric), featuring an appearance and tactile feel similar to genuine leather. Its average thickness (e.g., in the Z-axis) can be about 0.3 mm to 2 mm. The base 300 can also be non-slip, preventing the applicator from sliding during makeup application. Additionally, the base 300’s backside resists water-swelling, preventing excess expansion or deformation during wet usage — thereby preserving the surface’s intended powder pickup function and preventing the back strap from shifting. The elongated back strap 301 on the back is placed at a specific location (for instance, nearer to the concave curved portion of the makeup applicator 10, as detailed later) to better secure the makeup applicator, reducing deformation. The back strap 301 has a certain elasticity, used to keep the cosmetic tool and applicator tool 10 on the user’s finger, regardless of orientation.

[0046] In some non-limiting exemplary embodiments, the hardness of the makeup applicator 10 can exhibit a gradient distribution in a single direction. This hardness-gradient design can optimize the user experience and performance of the makeup applicator while meeting different portions’ requirements for softness, elasticity, and support. For instance, the bottom PU leather layer / base 300 of the makeup applicator 10 can have the highest hardness, thus providing overallsupport and maintaining shape stability. This high hardness is needed to resist deformation, but it must not be completely rigid or it would compromise holding comfort. Meanwhile, the middle flexible body 200 can have the second-highest hardness to provide a soft buffer that accommodates pressing and deformation. This middle layer thus requires moderate softness and elasticity to disperse pressure while supporting the outermost makeup applicator surface 100. Further, the top application outer layer 100 can have the lowest hardness so that it directly contacts the user’s skin, offering a gentle touch and an even application. Its feature is that it demands extremely high softness to conform to the skin and adapt to various facial contours. Such a hardness-gradient design optimizes the mechanical load distribution since the gradient across each structural or functional layer enables more effective dispersion of pressure during use, while maintaining overall stability and comfort. In other words, the firm bottom layer prevents the sponge from collapsing under prolonged pressure; the soft outer surface layer adheres to the skin to improve powder pickup and release; and the middle layer transitions between rigidity and softness, preventing the makeup applicator from being too stiff or too soft. Additionally, this hardness-gradient approach enhances the user experience by allocating functions more reasonably in different areas of the makeup applicator. For example, the handheld portion (generally the base 300) delivers stable support, and the application portion (the application outer layer 100) has a soft tactile feel.

[0047] In some instances, the hardness-gradient distribution of the makeup applicator 10 can be realized through material selection and structural design. First, regarding materials, for example, the base 300 can be a PU leather layer with a Shore A hardness of 40-60, possibly formed of high-density PU or thermoplastic polyurethane (TPU), characterized by high hardness and low elasticity, providing strong support. Then, the middle flexible body layer 200 can have a Shore A hardness of 10-20, made from a low-density open-cell material (e g., polyurethane foam), thus exhibiting softness yet elasticity for cushioning and deformation. Finally, the top makeup applicator surface layer 100 can have a Shore A hardness of <10 or no measurablehardness value, which can be made of microfiber, velour PU, or silicone. As a result, the top surface layer 100 has extremely high softness for comfortable skin contact.

[0048] Second, structural optimization can be employed to achieve the makeup applicator 10’s hardness-gradient distribution. For example, the bottom layer 300 can be slightly thicker to strengthen support; the middle layer 200 of medium thickness can serve as an elastic cushion zone; and the surface layer 100 remains relatively thin to enhance a soft feel. Structural optimizations can also include zoned designs, using different materials or hardness layers in different regions of the makeup applicator. For instance, a slightly harder material can be used at the edges to handle localized pressing, while the center remains softer for more comfortable application.

[0049] By selecting the key materials and implementing structural optimizations, a hardness-gradient makeup applicator 10 can offer multiple improved technical effects, for example: (1) Preventing overall collapse — the high-hardness PU bottom layer 300 provides strong support, preventing the middle sponge from losing shape due to repeated pressing. (2) Improving application uniformity — a soft top layer 100 conforms to facial curves to evenly release foundation or loose powder, reducing streaks. (3) Enhancing durability — the gradient design disperses pressure, prolonging the service life of the middle layer 200 and surface layer 100. (4) Improving grip comfort — the rigid bottom layer 300 provides support during handheld use, minimizing fatigue over extended periods.

[0050] Optionally, in some non-limiting exemplary embodiment, the hardness-gradient distribution of the makeup applicator 10 can appear in two directions. Specifically, for instance, the bottom layer 300 has the highest hardness (Shore A 40-60), followed by the top layer 100 (Shore A 10-20), and the middle layer 200 has the lowest (Shore A <10). Thus, the hardness increases stepwise from the middle layer 200 toward the top layer 100 (the first-direction gradient), and it also increases stepwise from the middle layer 200 toward the bottom layer 300 (the second-direction gradient, opposite the first). One can see that the incremental increase inthe first direction is smaller than that in the second direction. This hardness-distribution characteristic enables the top layer 100 to also provide some support, so that the top layer 100 and bottom layer 300 together form a receiving cavity S that does not easily collapse, better accommodating the middle flexible layer 200.

[0051] In some non-limiting exemplary embodiments, the makeup applicator 10’s elasticity can be characterized by high elasticity in the middle, moderate elasticity in the top layer, and the lowest elasticity in the bottom layer. Specifically, the top layer 100 can have moderate elasticity (e.g., an elastic modulus of 0.5-2 MPa and a rebound rate of 50%-70%) to deliver a soft, skin-friendly application. The middle layer 200 can have high elasticity (elastic modulus of 0.05-0.5 MPa, rebound rate of 80%-95%) for excellent buffering performance under compression. The bottom layer 300 can have low elasticity (elastic modulus of 2-10 MPa, rebound rate of 30%-50%) to ensure overall structural support and shape stability. One can observe that both the top layer 100 and bottom layer 300 each form an elasticity gradient with the middle layer 200. More specifically, the makeup applicator 10’s elasticity profile in this scenario shows a bi-directional gradient: in the first direction, the elasticity decreases stepwise from the middle layer 200 toward the top layer 100, and in the second direction (opposite the first), it decreases from the middle layer 200 toward the bottom layer 300. Moreover, the magnitude of the decrease in the first direction is smaller than in the second direction. This elasticity-gradient design significantly boosts durability and user comfort. The layered elasticity effectively means that the middle sponge layer 200 provides notable cushioning and quick rebound, absorbing and dispersing pressure; the top layer 100 offers moderate softness and adheres during application without excessive deformation that would compromise uniformity; and the bottom layer 300 exhibits higher rigidity and lower elasticity, securing the overall structure to avoid deformation.

[0052] Optionally, in other non-limiting exemplary embodiments, the makeup applicator 10’s elasticity can exhibit a single-direction gradient distribution. That is, the top layer 100 is the mostelastic (elastic modulus of 0.05-0.5 MPa, rebound rate of 80%-95%), the middle layer 200 is second (elastic modulus of 0.5-2 MPa, rebound rate of 50%-70%), and the bottom layer 300 is the least elastic (elastic modulus of 2-10 MPa, rebound rate of 30%-50%). Compared to conventional makeup applicators made from a single elastic material, this single-gradient design offers a more precise distribution of performance — namely, elasticity decreases progressively from the top to the bottom. This design ensures the top layer has the highest softness and rebound, the middle layer provides moderate elasticity and support, and the bottom layer has minimal elasticity for overall stability. As a result, the makeup applicator offers softness, cushioning, and stability all at once, overcoming the usual compromise between softness and support in conventional applicators.

[0053] In some non-limiting exemplary embodiment, the middle layer 200 can simply be housed within the receiving cavity S bounded by the top layer 100 and the bottom layer 300, without being connected or fixed (e.g., by adhesive) to either layer. In other words, the middle layer 200 is movably installed in the receiving cavity S. Such a movable arrangement can enhance the applicator 10’s adaptability to deformation because, for instance, when the sponge body 200 is unfixed, it can freely accommodate pressing forces from multiple directions. Its deformation is not hindered by an adhesive bond, making compression and rebound within the receiving space easier. This freedom of movement can boost the softness and elasticity of the makeup applicator 10, improving user comfort. Additionally, this arrangement can improve the applicator’s cushioning performance, since a freely placed sponge body 200 can slightly slide or adjust its position under pressure, thereby distributing forces and avoiding localized discomfort. Further, it enhances application uniformity and dynamic adjustment of the sponge body 200’ s deformation. Specifically, the sponge body 200’ s mobility permits fine-tuning according to the magnitude and angle of pressing, preventing localized uneven application caused by a rigid connection. During use, the top layer and sponge body can more effectively conform to the skin surface, ensuring even release of cosmetics (e g., powder or liquid foundation).

[0054] In some non-limiting exemplary embodiment, the middle layer 200 can simply be contained in the receiving cavity S, with only minimal adhesive fixation at the corners / edges of the middle layer 200 relative to the upper and lower layers (100 and 300), while most of the middle layer 200 remains unattached and free to move. This design combines stability with mobility. Specifically, it provides necessary structural stability to prevent displacement of the middle layer 200 (the sponge body). Bonding at the perimeter comers can ensure that the middle sponge body 200 does not shift or disengage from the upper and lower layers under external forces, especially when pressed intensively or used frequently; the corner fixation helps maintain the makeup applicator’s structural stability. Second, this arrangement can reinforce the layer-to-layer bonding of the makeup applicator 10, since partial adhesion can prevent layer separation and ensure the applicator remains integral after prolonged use. Furthermore, from a performance standpoint, this arrangement preserves the elasticity and cushioning of most of the middle layer 200’ s area — i.e., allowing partial freedom of movement so that the central portion remains unadhered, retaining some mobility for the middle sponge body 200 to deform in response to the intensity and direction of pressing, thus optimizing cushioning and conforming to application. The corner fixation only restricts the sponge’s overall shift but does not affect the dynamic behavior of the central region. Additionally, adhering only the edges of the middle layer 200 relieves stress concentrations that might otherwise occur if the entire middle layer were fully bonded. Such localized stress could compromise overall elasticity distribution and application uniformity. Comer fixation effectively avoids that issue while maintaining a continuous elastic transition.

[0055] Referring to FIGS. 3, 4, and 9, in some non-limiting exemplary embodiment, the top layer 100 can generally be cap-shaped, having an inner surface 101 and an outer surface 102. The inner surface 101 can defines the aforementioned receiving cavity S, and the outer surface 102 forms the makeup-applying surface of the makeup applicator 10, configured so that users can perform operations such as powder pickup and powder release. This outer surface 102 canprimarily include three parts: a substantially flat, generally centered top surface 103; a peripheral curved surface 104 (also referred to as a group 104 of curved surfaces) disposed circumferentially around the top surface 103; and a bottom annular surface 105 disposed at the bottom of the top layer 100 and arranged circumferentially. The bottom annular surface 105 is planar in the Z-axis direction (or flush with the Z-axis) and serves as the bottom portion of the entire top layer 100, helping preserve the top layer 100’s shape against deformation. Moreover, referring to FIGS. 7-9, the curved- surface group 104 extends between the top plane 103 and the bottom annular surface 105, providing Z-axis support for forming the receiving cavity S.Optionally, in other non-limiting exemplary embodiment, the outer surface 102 of the top layer 100 can only have the top surface 103 and the surrounding curved-surface group 104. Optionally, in other non-limiting exemplary embodiment, the top surface 103 of the top layer 100 can be a non-planar portion — e.g., a curved surface that protrudes outward relative to the center of the makeup applicator 10.

[0056] Referring to FIGS. 9 and 10, the curved-surface group 104 can be formed by successively joining multiple curved surfaces with differing curvature characteristics. For example, the group 104 can include three types of surfaces, each having a distinct Gaussian curvature. First, the group 104 can include a first-type curved surface 106 that is roughly symmetrical about the Z-Y reference plane, with negative Gaussian curvature. Thus, the first-type curved surface 106 is also called a saddle surface 106 or first-type Gaussian surface; it extends generally along the X-axis in a curved fashion. Starting from the saddle surface 106 and moving clockwise, one sees a second-type curved surface 107 adjacent to the saddle surface 106 and extending in a clockwise direction. The second-type curved surface 107 has a positive Gaussian curvature, so it is called a spherical surface 107 or second-type Gaussian surface.Continuing clockwise, the curved-surface group 104 includes a third-type curved surface 108 right next to that spherical surface 107; the third-type curved surface 108 has zero Gaussian curvature, so it is called a cylindrical surface 108 or third-type Gaussian surface. Continuingclockwise, the curved-surface group 104 includes a second spherical surface 109 next to that cylindrical surface 108. Moving further clockwise, one finds a second cylindrical surface 110, a third spherical surface 111, a third cylindrical surface 112, a fourth spherical surface 113, a fourth cylindrical surface 114, and a fifth spherical surface 115, which abuts or connects to the saddle surface 106. One can see that all these sub-surfaces (106-115) in the curved- surface group 104 connect pairwise. Further, each sub-surface in the group 104 can be fitted or integrally formed together, and the entire curved-surface group 104 is symmetrical about the Z-Y reference plane.

[0057] In some non-limiting exemplary embodiment, the adjoining characteristics of any two adjacent surfaces among the curved- surface group 104 can meet C° continuity, i.e., they touch without gaps at the interface point but might form a sharp comer. In other non-limiting exemplary embodiment, these adjoining characteristics can meet C1continuity, meaning the first derivative at the interface is continuous (the tangent direction is uniform) with no obvious comers. Preferably, in some non-limiting exemplary embodiment, any two adjacent surfaces meet C2continuity, meaning the second derivative is continuous at the interface (the curvature is continuous), enabling smoother surface transitions. In some non-limiting exemplary embodiment, to further optimize visual effects, any two adjacent surfaces in the curved-surface group 104 can adopt G2geometric continuity criteria so that the curvature changes uniformly at the interface, avoiding abruptness. Concurrently, transitional surfaces (e.g., NURBS surfaces) can be introduced to enhance local smoothness, thereby achieving higher manufacturing precision and tactile comfort. It should be noted that these adjacency features likewise apply to a top layer 100 that is integrally molded.

[0058] Additionally, all surfaces (106-115) in the curved- surface group 104 can be joined or connected at the top (along the height direction or Z-axis reference direction) to the top surface 103. More specifically, every first-type curved surface and every third-type curved surface is line-connected / line-contacting the top surface 103 at the top, whereas every second-type curvedsurface is point-connected / point-contacting the top surface 103 at the top. Thus, the top surface 103 has a curved boundary portion matching the curvature of the first-type curved surfaces (e.g., curvature along the X-Y reference plane), while other periphery portions of the top surface 103 are straight segments. Notably, the joining characteristics of the curved-surface group 104 and the top surface 103 also apply if the top layer 100 is formed as a single integrated piece.Moreover, referring to FIGS. 5-8, one can see that in certain cross-sectional views of the makeup applicator 10 (for example, a plane cutting through the center region of the makeup applicator 10, referencing sectional lines Hl-Hl, H2-H2, and H3-H3), all sub-surfaces (106-115) in the curved-surface group 104 bulge outward away from the makeup applicator’s center.

[0059] In some non-limiting exemplary embodiment, the saddle surface 106 overall can have a shape that curves toward the center portion of the makeup applicator 10, and thus the saddle surface 106 constitutes a recessed region of the makeup applicator 10. This curvedsaddle-surface design can be based on ergonomic considerations. Specifically, the saddle surface 106 can be designed especially for curved human-body areas such as the under-eye region. At least part or all of the saddle surface 106 can better conform to various curved skin contours, including but not limited to around the eyes, around the face, or the neck contour, and it can be used for concealing, for instance to address dark circles or eye bags.

[0060] Moreover, the curved characteristics of the saddle surface 106 enable the user to employ the makeup applicator 10 along multiple directions to perform makeup operations on curved body areas (e.g., under-eye). For instance, at least two operational directions can be used to align the makeup applicator 10 (specifically the saddle surface 106 portion) with the user’s under-eye area and perform makeup application (e.g., powder release). An exemplary first operational direction is for the user to hold the makeup applicator 10 horizontally and approach from a distance (where the user’s line of sight is roughly parallel to the X-Y reference plane of the makeup applicator 10) to align and accommodate the user’s under-eye curvature for makeup application. In that case, a portion of the saddle surface 106 far from the top surface 103 cancontact and effectively accommodate the under-eye curvature (the curvature area under the eye) and serve as the primary makeup application surface. See FIG. 11, which shows a scenario of operating the makeup applicator 10 along a horizontal direction for the under-eye region.Another exemplary second operational direction is that the user can hold the makeup applicator 10 vertically, from under the eye toward above the eye (with the user’s line of sight perpendicular to the X-Y reference plane), to accommodate the under-eye curvature. In that instance, the curved portion of the saddle surface 106 near the top surface 103 can contact and effectively accommodate the under-eye curvature and serve as the primary makeup application surface. See FIG. 12, which shows a scenario of operating the makeup applicator 10 along this second direction for the under-eye region.

[0061] Additionally, due to the curved characteristics of the saddle surface 106, the user can also operate the makeup applicator 10 along any third operational direction between the first and second directions, allowing at least a portion of the saddle surface 106 to effectively align with and accommodate the under-eye or similar curved area to perform makeup application. One can observe that the saddle surface 106 in effect constitutes the main portion of a first-type operating region of the makeup applicator 10. This first-type operating region can include the saddle surface 106, plus the portions of spherical surface 107 adjacent to the saddle surface 106 (e.g., half of spherical surface 107), and the portions of spherical surface 115 adjacent to the saddle surface 106 (e.g., half of spherical surface 115). The first-type operating region is primarily used for makeup application on curved body parts like the under-eye. This allows the makeup applicator 10 to contact and accommodate the user’s under-eye curvature in multiple directions for makeup application. Not only does it provide the user with multiple ways to handle the makeup applicator 10, but it also lets the user conveniently choose an appropriate operational angle or direction to effectively apply makeup (e.g., powder release) for the under-eye or other curved areas. In some non-limiting exemplary embodiment, another curved surface that bends / recedes toward the center portion of the makeup applicator 10 can replace the saddlesurface 106.

[0062] In some non-limiting exemplary embodiment (see FIGS. 9-10), the curved-surface group 104 can also have or define two symmetrical second-type operating regions. The first such second-type operating region includes the cylindrical surface 108, the portion of spherical surface 107 adjacent to cylindrical surface 108 (e.g., half of spherical surface 107), and the portion of spherical surface 109 adjacent to cylindrical surface 108 (e.g., half of spherical surface 109). Accordingly, this first second-type operating region is mainly formed by cylindrical surface 108 or has its central operating area formed by cylindrical surface 108. The second symmetrical second-type operating region includes the cylindrical surface 114, the portion of spherical surface 113 adjacent to cylindrical surface 114 (e.g., half of spherical surface 113), and the portion of spherical surface 115 adjacent to cylindrical surface 114 (e.g., half of spherical surface 115). Hence, the second second-type operating region is mainly formed by cylindrical surface 114 or has its central operating area formed by cylindrical surface 114. See FIGS. 9-10. These two second-type operating regions can be symmetrical about the Z-Y reference plane. The second-type operating region can be configured so that, during the application of base makeup to the upper eye region, the user can also address the nasal root and / or nasal side root area.Referring to FIG. 11, for instance, while the user uses the first-type operating region (the saddle surface 106) in the exemplary first operational direction to apply makeup to the under-eye curvature, the user can simultaneously make use of this first second-type operating region (primarily cylindrical surface 108) to touch and apply makeup (e.g., apply or release powder) to the nasal root or nasal side root. Referring to FIG. 12, if the user changes the operational direction (e.g., adopting the aforementioned second operational direction for using the makeup applicator 10), they can likewise use the first-type operating region (the saddle surface 106) for the under-eye area while simultaneously using the second-type operating region (mainly cylindrical surface 108) for the nasal root and / or nasal side root. Similarly, if the user operates the makeup applicator 10 in any third operational direction between the first and seconddirections, they can still use the first-type operating region (the saddle surface 106) for the under-eye area and concurrently the second-type operating region (mainly cylindrical surface 108) for the nasal root and / or nasal side root.

[0063] In some non-limiting exemplary embodiments, the curved- surface group 104 can further have or define a third-type operating region, which can be composed of spherical surface 111 or predominantly the central portion of spherical surface 111. This third-type operating region can be used for detail work — for example, spot-pressing for precise application. It can include (but is not limited to) precision work on local non-flat areas like the inner corner of the eye, the nasal wing, or other uneven facial areas. Notably, the other spherical surfaces in the curved-surface group 104 (107, 109, 111, 113, 115) also feature comparable localized precision makeup capabilities.

[0064] In some non-limiting exemplary embodiment, the curved-surface group 104 can also have or define two fourth-type operating regions that are symmetrical about the Z-Y reference plane. The first such fourth-type operating region includes cylindrical surface 110, the portion of spherical surface 109 near cylindrical surface 110 (e.g., half of spherical surface 109), and the portion of spherical surface 111 near cylindrical surface 110 (e.g., half of spherical surface 111). Hence, that first fourth-type operating region is mainly formed by cylindrical surface 110 or has cylindrical surface 110 as its central operating area. The second fourth-type operating region includes cylindrical surface 112, the portion of spherical surface 111 near cylindrical surface 112 (e.g., half of spherical surface 111), and the portion of spherical surface 113 near cylindrical surface 112 (e.g., half of spherical surface 113). The fourth-type operating region can be configured to perform clear partitioning operations on already-applied makeup during the makeup process — for example, contouring or creating more three-dimensional skin contours.

[0065] Moreover, one can see that between any two adjacent operating regions, defined at least in part by the curved-surface group 104, there is a corresponding spherical surface (107, 109, 111, 113, 115) acting as a transition portion. This ensures a smooth transition between two adjacentoperating regions, ensuring there is no abrupt difference in effect — e.g., lacking a smooth transitional portion might cause a sudden change in the makeup result or the user’s tactile experience.

[0066] In some non-limiting exemplary embodiment, the flat top surface 103 of the makeup applicator 10 itself can define a fifth-type operating region for large-area powdering, enabling the user to quickly apply makeup and avoid patchiness. This can include, but is not limited to, large-area application on relatively flat facial areas such as the cheeks, forehead, or chin.

[0067] Referring to FIGS. 13-14, the projection of the makeup applicator 10 onto the X-Y reference plane forms a periphery P (as viewed from the top layer 100 downward toward the bottom layer 300). Starting from a first concave turning point (local extremum) 116 and moving clockwise, the periphery P encounters an inflection point 117 where the periphery P transitions from a concave periphery 132 to a convex periphery 133. The convex periphery refers to a protruding portion of the makeup applicator 10’s periphery, while the concave periphery refers to a recessed portion of the makeup applicator 10’s periphery. More specifically, the convex periphery is defined by a curve whose radius is wholly or partially located inside the makeup applicator 10’s main body, whereas the radius for the concave periphery portion lies outside the makeup applicator 10’s main body. Additionally, in the up-down direction (the Y reference axis) of the makeup applicator 10, the concave turning point 116 can serve as the lowest concavity of the applicator’s upper end portion in the projected contour. From the turning point 117 onward, the periphery P is convex, and that portion of the convex periphery 133 has a convex turning point (local extremum) 118, then ends at an intersection point 119. From the intersection point 119 to the intersection point 120 is a linear portion 134 of the periphery. From the intersection point 120 onward, the periphery enters a second convex periphery 135, which also includes a convex turning point (local extremum) 121 and ends at an intersection point 122. From this intersection point 122 onward, the periphery enters a second linear portion 136, which ends at an intersection point 123. From the intersection point 123 onward, the periphery enters a thirdconvex periphery 137, which has a convex turning point (local extremum) 124. The line connecting this convex turning point (local extremum) 124 and the previously mentioned concave turning point (local extremum) 116 can form a longitudinal axis A of the makeup applicator 10, and the corresponding parts of the makeup applicator 10 (lines, surfaces, or three-dimensional portions) can be symmetrically distributed relative to that longitudinal axis. Continuing clockwise, the third convex periphery 137 ends at an intersection point 125. From the intersection point 125 onward, the periphery P enters a third linear-edge portion 138, which ends at an intersection point 126. From the intersection point 126 onward, the periphery P enters a fourth convex periphery 139, which has a convex turning point 127, then ends at an intersection point 128. From the intersection point 128 onward, the periphery goes into a fourth linear-edge portion 140, ending at an intersection point 129. From the intersection point 129 onward, the periphery P enters a fifth convex periphery 141, which likewise has a convex turning point 130, ending at an inflection point 131. Thus, the periphery P extends one full circle clockwise and returns to the initial concave periphery 132, i.e., from the inflection point 131 back along the concave periphery 132 to the concave turning point (local extremum) 116.

[0068] Additionally, in the up-down direction (the Y reference axis) of the makeup applicator 10, the convex turning points 118 and 130 serve as the highest protrusions at the upper end portion, while the convex turning point 124 acts as the lowest protrusion at the lower end portion of the makeup applicator 10. And in the left-right direction (the X reference axis) of the makeup applicator 10, the convex turning points 127 and 121 serve as the left and right endpoints, respectively.

[0069] It should be noted that any plane parallel to the X-Y reference plane that sections the makeup applicator 10 yields a periphery identical or similar to the aforementioned periphery P, ensuring that the user can achieve essentially continuous makeup effects or a consistent tactile experience when using the corresponding portions of the curved-surface group 104 at different angles or positions, thus providing more controlled makeup results. In some non-limitingexemplary embodiment, the four linear segments (134, 136, 138, 140) of the makeup applicator 10’s projected contour can each be replaced by a curved segment, preferably one with a lower degree of concavity or convexity.

[0070] In some non-limiting exemplary embodiment, referring to FIGS. 13-14, the aforementioned convex turning points 121 and 127 can define a line C, and further, the straight line segment between turning points 121 and 127 (LI [121-127]) constitutes the maximum width of the makeup applicator 10 (in the X reference-axis direction). In addition, the earlier convex turning points 118 and 130 define a line B, and the line-segment distance between those turning points 118 and 130 on line B is L2 (118-130). Preferably, in some non-limiting exemplary embodiment, the ratio L2 / L1 can be between 0.6 and 0.8, which ensures that the makeup applicator 10 retains a sufficient size in its second-type operating region for effectively applying makeup around the nose bridge simultaneously with the upper eye makeup process. In some non-limiting exemplary embodiment, line B and line A intersect at an intersection point 142. In this figure, the lowest point 116 (the concave turning point) of the recessed portion of the makeup applicator 10’s projected contour and the intersection point 142 have a linear distance L3 (116-142), which is also the perpendicular distance from the lowest point 116 to line B. The ratio of L3 to the aforementioned distance L2 can be between 1 / 8 and 1 / 4. This range is set to ensure and guarantee that the makeup applicator 10 can effectively contact and accommodate curved skin areas such as the under-eye region, because experiments show that when the ratio L3 / L2 is less than 1 / 8, the recessed portion (e.g., the concave periphery 132) is insufficiently recessed, i.e., nearly flat, and can not adequately fit curved areas like under the eye. Conversely, when L3 / L2 is greater than 1 / 4, the recessed portion (e.g., the concave periphery 132) is overly deep, preventing curved areas like under the eye (particularly the part of skin having the largest average curvature under the eye) from effectively contacting the recessed portion of the makeup applicator 10 — especially the bottom portion of the recessed region. This means the under-eye area cannot be effectively made up, while also wasting the recessed space of the makeupapplicator 10 and reducing overall usability. In some non-limiting exemplary embodiment, the line-segment distance LI between turning points 121 and 127 (also termed the makeup applicator 10’s maximum width) can range from 2 cm to 10 cm.

[0071] In some non-limiting exemplary embodiment, the line A and line C intersect at an intersection point 143, and the straight-line distance between the intersection point 142 and that intersection point 143 is L4 (142-143). Moreover, the straight-line distance between the convex turning point 124 and the intersection point 142 is L5 (124-142), which roughly constitutes the longitudinal dimension of the makeup applicator 10. In some non-limiting exemplary embodiment, the ratio of L4 to L5 can be between 1 / 5 and 1 / 2. Setting the distance ratio in this range ensures that the user has a sufficiently appropriate size for gripping the makeup applicator 10. For instance, a typical way of holding the makeup applicator 10 is for the user to insert the index and middle fingers of their right hand into the back strap 301 on the bottom layer of the makeup applicator 10, with the strap 301 securing those fingers, while the user’s right thumb accordingly presses against the top surface (e.g., the outer surface 102) opposite the bottom layer. If the L4 / L5 ratio exceeds 1 / 2, the user’s thumb, to cooperate with the index and middle fingers in gripping the makeup applicator 10, intrudes into the applicator’s other application surfaces, thereby reducing the area intended for makeup application and severely affecting the makeup result. Conversely, if the L4 / L5 ratio is below 1 / 5, then the makeup applicator 10’s longitudinal dimension is too long, thereby complicating the coordinated hold between the thumb, index, and middle fingers. Furthermore, such a small ratio for L4 / L5 also leads to insufficient cushioning in the recessed region of the makeup applicator 10, because that ratio constrains the elastic range available for absorbing pressure in the recessed portion. In some non-limiting exemplary embodiment, the straight-line distance L5 (which can also be referred to as the makeup applicator 10’s maximum longitudinal dimension) between the convex turning point 124 and intersection point 142 can range from 2 to 10 cm.

[0072] In some non-limiting exemplary embodiment, referring to FIG. 13, the lowest point(concave turning point) 116 and highest point (convex turning point) 130 of the makeup applicator 10’s recessed region 132 define a line G, while the fourth linear-edge portion 140 defines a line F. The angle £ between lines G and F is an obtuse angle, preferably set to 120°. This obtuse angle is chosen for ergonomic reasons. Specifically, the angle between the under-eye area and the nasal root has been observed to be an obtuse angle. Thus, configuring the angle £ as an obtuse angle makes it easier for the makeup applicator 10 to fit the user’s nasal root region when performing makeup operations, especially when the makeup applicator 10 is being used to apply makeup both under the eye and around the nasal root region simultaneously.Notably, owing to the symmetry of the makeup applicator 10, the angle between the line (not shown) connecting the lowest point 116 and a local highest point 118, and the line D defined by the first linear segment 134, is also the same obtuse angle (not shown). It should be noted that in some non-limiting exemplary embodiments, lines F and D can each be formed by tangents to local extremum points in the corresponding contour regions (134 and 140) of the makeup applicator 10. For example, region 134 and region 140 might both be replaced by curved segments.

[0073] In some non-limiting exemplary embodiments, the angle a between line D (defined by the first linear segment 134) and line A (the longitudinal axis) can range from 20° to 70°. This angle range is chosen because the second-type operating region on contour areas 134 and 140 of the makeup applicator 10 must work together with the first-type operating region to apply makeup simultaneously to the user’s under-eye region and nasal root area. Verified tests indicate that if a < 20° or a > 70°, the makeup applicator 10 cannot effectively perform simultaneous makeup on the user’s under-eye and nasal root areas. Specifically, if a. < 20°, while the first-type operating region contacts the under-eye, the second-type operating region barely or ineffectively contacts the nasal root. If a > 70°, then while the second-type operating region contacts the nasal root, the first-type operating region barely or ineffectively contacts the under-eye — or, conversely, if the first-type operating region contacts the under-eye, the second-type operatingregion prematurely collides with the nasal root region, significantly harming the makeup outcome. In addition, the angle between line E (defined by the second linear-edge portion 136) and line A is essentially the same as a.

[0074] In some non-limiting exemplary embodiments, referring to FIG. 13, the projected contours corresponding to the five spherical surfaces of the makeup applicator 10 can all form a convex periphery (133, 135, 137, 139, 141), and each such convex periphery can subtend the same central angle 3, which can be between about 20° and 70°. This range for 3 is primarily to ensure a smooth transition among the various operating regions of the makeup applicator 10. In other non-limiting exemplary embodiments, each shaped periphery (133, 135, 137, 139, 141) can have different central angles, but still between 20° and 70°. In some non-limiting exemplary embodiment, the concave periphery 132 corresponds to a central angle B (not shown), and the ratio B / 3 can be set from 1.5 to 3.5. This ratio also ensures effective contact and makeup application by the makeup applicator 10’ s first-type operating region on curved bodily areas like under the eye. In some non-limiting exemplary embodiment, the ratio of the curvature radius r of the convex periphery (133, 135, 137, 139, 141) to the curvature radius R of the concave periphery 132 (not shown) can be set between 1 / 6 and 1 / 2. Such a curvature-radius ratio preserves a smooth transition between the makeup applicator 10’s first-type and second-type operating regions and prevents abrupt changes in makeup effect or user sensation when switching between those two operating regions.

[0075] In some non-limiting exemplary embodiment, referring to FIGS. 1-4, the makeup applicator 10 can consist only of the middle layer 200 and the bottom layer 300, and then the geometry and structural characteristics of the surface of the middle layer 200 can be the same or similar to the geometry and structural characteristics of the previously mentioned top layer 100 (for instance, shape, projected contour, relevant angles, and dimensional ratios). More specifically, any geometry or structural feature described above for the outer surface 102 of the top layer 100 can be applied to the surface / top of the middle layer 200 where there is no conflict,thereby preserving the aforementioned superior operational characteristics and excellent makeup results of the makeup applicator 10. In some non-limiting exemplary embodiment, the makeup applicator 10’s bottom layer 300, middle layer 200, and top layer 100 can be integrally formed, for example from a single material (e.g., PU sponge). In this scenario, the geometrical / structural features of the one-piece makeup applicator 10’s surface / layer still can be the same or similar to those described for the top layer 100 (e.g., shape, projected contour, relevant angles, dimensional ratios, etc.). In some non-limiting exemplary embodiment, the makeup applicator 10’s top layer 100 and middle layer 200 can be integrally formed while inheriting all geometric and structural features of the top layer 100.

[0076] In some non-limiting exemplary embodiment, referring to FIG. 15, the strip-like back strap 301 of the bottom layer 300 can be bisected by the line C defined by the convex turning points 121 and 127; i.e., line C is centrally located relative to the projection of the back strap 301 on the X-Y reference plane. In the longitudinal direction (the Y reference-axis direction or the makeup applicator’s up-down direction), the back strap 301 is closer to the recessed portion near the top end of the makeup applicator 10 (including the saddle surface 106). In the lateral direction (the X reference-axis direction or the makeup applicator’s left-right direction), the back strap 301 is symmetrically arranged about the Z-Y reference plane while also being located near the left and right ends of the makeup applicator 10 (e.g., spherical surfaces 135 and 139). This placement of the back strap 301 is especially advantageous for the user’s grip on the makeup applicator 10 because, regardless of which side of the back strap 301 the user’s fingers (mainly the index and middle fingers) are inserted from, they can effectively hold the makeup applicator 10. If the back strap 301 were placed too high or too low, the makeup applicator 10 might fall or fail to apply makeup effectively. Additionally, this specific placement of the back strap 301 can better fix the overall shape of the makeup applicator 10, avoiding deformation, since the back strap 301 itself has some elasticity, effectively spanning the widest lateral extension region of the makeup applicator 10 and holding its left and right ends.

[0077] Furthermore, referring to FIGS. 4, 8, and 15, the back strap 301 is configured so that it allows precisely two fingers of the user to be inserted into the back strap 301 without damaging the structure of the makeup applicator 10, compromising the makeup result, or affecting finger comfort. More specifically, those two fingers can be inserted into the opening 302 jointly defined by the back strap 301 and the bottom layer 300. Moreover, if the opening 302 has no fingers or similar items inserted, the length between the two ends of the back strap 301 is a first length; once the user’ s fingers or similar items are inserted, the length between the two ends of the back strap 301 becomes a second length. The ratio of the first length to the second length is between 0.6 and 0.9, ensuring adequate elastic expansion and contraction of the back strap 301, effectively securing the user’s fingers without being overly loose or tight, thereby protecting the user experience with the makeup applicator 10.

[0078] In some non-limiting exemplary embodiment, referring to FIGS. 13-15, it can be seen that the makeup applicator 10 can have its greatest lateral width (along the X reference axis) between the turning points 121 and 127. The turning points 121 and 127 define line C. From the boundary defined by line C upward, the lateral width of the makeup applicator 10 gradually decreases at a first rate, and from the boundary defined by line C downward, the lateral width gradually decreases at a second rate that is larger than the first rate. Notably, the term “rate” here refers to an average rate of decrease. More specifically, the rate can be interpreted as how much the lateral width of the makeup applicator 10 changes for every increment of longitudinal distance. Thus, the overall average width of the portion of the makeup applicator 10 below line C is less than that above line C.

[0079] Additionally, referring to FIGS. 16-22, more detailed views (e.g., perspective and the conventional six orthographic views) of the makeup applicator 10 in these embodiments of the present disclosure are shown to help those skilled in the art thoroughly understand the geometric and structural features of the makeup applicator 10, as well as the corresponding functional results it can achieve.

[0080] Referring to FIG. 23, an embodiment of the present disclosure also provides a cosmetic bag 400, which can primarily include an upper portion 401, a lower portion 402, and a zipper device 403 connecting the two. The upper portion 401 and the lower portion 402 together form the overall structure of the cosmetic bag 400, with the upper portion 401 serving as the upper shell, made of a lightweight yet sturdy material and designed with a curved surface to enhance aesthetics and user comfort. The lower portion 402 serves as the lower shell of the cosmetic bag, and it can be operably opened or closed relative to the upper portion 401 by way of the zipper device 403. Acting as the connecting component, the zipper device 403 comprises a slider 404, an upper tooth track 405, and a lower tooth track 406. The upper tooth track 405 is fixed at the edge of the upper portion 401, and the lower tooth track 406 is fixed at the edge of the lower portion 402. The slider 404 is slidably mounted between the upper tooth track 405 and the lower tooth track 406, allowing the user to open or close the cosmetic bag 400 by sliding the slider 404. The zipper device 403 not only has a simple structure and convenient operation, but also possesses good connecting strength and durability to ensure that the cosmetic bag remains stable over prolonged usage.

[0081] During use, the cosmetic bag 400 is primarily used for storing various makeup devices, such as the aforementioned makeup applicator 10, makeup brushes, eyeshadow palettes, lipsticks, and other cosmetics. Inside the cosmetic bag, partition structures or elastic pouches can be provided for categorizing makeup devices, preventing damage or contamination caused by random stacking. In operation, the user can open the cosmetic bag 400 via the zipper device 403, neatly place the makeup devices inside, and then slide the slider 404 to close the bag so that it is securely sealed. The design of the zipper device 403 not only ensures a firm seal for the cosmetic bag, but also prevents dust and moisture ingress to some extent, thus protecting the makeup devices inside. Moreover, the exterior of the cosmetic bag 400 can be designed with various decorative styles based on actual needs — for instance, adding textures, patterns, or waterproof coatings to improve overall user experience and market appeal. Overall, in terms of bothstructural design and functionality, this embodiment’s cosmetic bag 400 offers significant advantages: it uses the zipper device 403 to flexibly connect the upper portion 401 and the lower portion 402, achieving convenient operation and efficient storage while also meeting user demands for aesthetics, practicality, and durability.

[0082] In some non-limiting exemplary embodiments, referring to FIG. 24, the present embodiment provides the opened configuration of the aforementioned cosmetic bag 400. On the basis of achieving a compact exterior design, internal multifunctional storage arrangements have been added to meet diverse user requirements. As shown in FIG. 24, the upper portion 401 and lower portion 402 can be operably connected via a pivot joint 407. The pivot joint 407 can be arranged in the form of a hinge, allowing the upper portion 401 to stably open and close relative to the lower portion 402, thus ensuring reliability and convenience during use. The interior of the upper portion 401 is provided with an elastic band 411 and an elastic mesh 412. The elastic band 411 is fixed along the interior surface of the upper portion 401 to stably hold flat makeup tools (e.g., a small mirror, the makeup applicator 10, or a makeup palette) in position, whereas the elastic mesh 412 covers most of the interior area of the upper portion 401. Through its elasticity, it can secure items inside the upper portion 401 ’s internal space, and through its mesh design, it provides visibility and ventilation so that stored items are not damaged by moisture buildup over lengthy storage periods.

[0083] The interior of the lower portion 402 contains a main storage space 409, which is designed as an open region for storing larger makeup tools or auxiliary items (e.g., the makeup applicator 10, a foundation compact, or other common cosmetics). Above the storage space 409, multiple smaller storage areas are further delimited by a divider 408 comprising a roughly square-shaped flat partition plate. The divider 408 can be connected to the overall cosmetic bag structure through the pivot joint 407, allowing rotational adjustment of the divider’s angle or position. The first surface 4081 of the divider 408 can be provided with or define multiple independent storage compartments 410, typically used for slender makeup tools such as makeupbrushes, eyeliner pens, or lip liner pens. In other cases, the storage compartments 410 can also hold the aforementioned makeup applicator 10. A precisely designed partition structure maintains some independence among the storage compartments 410 to prevent collision or wear among the tools, thereby enhancing orderly storage and protection. Notably, the divider 408 can provide additional partition-based storage during use, but it can also be flipped into the interior space of the upper portion 401 and fit against the elastic mesh 412. Thus, when the storage compartments 410 are not needed, the cosmetic bag can have a larger main storage space 409. This flexible flipping feature significantly increases the utility and storage adaptability of the cosmetic bag 400.

[0084] This embodiment is further improved by the modular design of the components and their multipurpose functionalities. On one hand, the pivot joint 407 yields robust yet flexible connections among the upper portion 401, the lower portion 402, and the divider 408, improving overall structural stability and service life. On the other hand, the coordinated design of the elastic band 411 and the elastic mesh 412 makes full use of the interior space of the upper portion 401, providing users with more storage options while effectively reducing the bag’s weight thanks to the mesh material’s lightweight and breathable properties. These design features not only address the problem of single-function bags whose internal storage space cannot be flexibly allocated, but also, by employing a modular, flexible structure, offer the user a higher degree of storage freedom.

[0085] This embodiment further refines the design of the cosmetic bag 400, notably by placing an independent storage box 414 on the back side 4082 of the divider 408, substantially boosting the cosmetic bag’s functionality and space utilization, fulfilling the separate storage requirements of special makeup tools (e.g., the makeup applicator 10), while retaining the bag’s overall compactness and aesthetic appeal.

[0086] In some non-limiting exemplary embodiment, as shown in FIGS. 24-25, the cosmetic bag 400 can include an upper portion 401 and a lower portion 402 connected by a pivot joint 407.The upper portion 401 and lower portion 402 can open and close to form the main storage space of the bag. The divider 408 is installed in the internal space 409 of the lower portion 402. Its front side 4081 can be designed with multiple storage compartments 410 for classifying slender makeup tools (e.g., makeup brushes or eyeliner pens), while the back side 4082 of the divider can be equipped with a smaller, separate storage box 414. The structure of the storage box 414 can comprise primarily a base 418 and a lid 417, with the base 418 securely mounted on or directly bonded to the back side 4082 of the divider via fastening means (e.g., clips or embedded structures). This ensures that the box remains stably attached during the flipping or movement of the divider. The lid 417 can open or close relative to the base 418, allowing the user to open the storage box 414 and retrieve or store items with a simple motion. To enhance ventilation, optional breathable vents 416 can be formed on the lid 417, effectively expelling any moisture that can accumulate inside, keeping the makeup applicator 10 dry and clean.

[0087] When the divider 408 is in the lower portion 402, the base 418 of the storage box 414 remains firmly connected to the back side 4082 of the divider, and with the lid 417 in a closed state, the makeup applicator 10 can be safely stored in the storage box 414. This achieves an effect of isolated storage for makeup implements such as an applicator, which has relatively high requirements for cleanliness. When the user needs the makeup applicator 10, they can flip the divider 408 into the interior space of the upper portion 401 via the pivot joint 407. In that case, the storage box 414 flips along with the divider 408 into the upper portion 401, making it easily accessible. The user can open the lid 417 to retrieve or store the applicator. The breathable vents 416 on the lid 417 further ensure that during extended storage, the applicator remains dry and odor-free, which is especially important for tools that come into direct contact with the skin.

[0088] This embodiment’s design provides notable technical advantages. First, the smaller internal storage box 414 offers an independent storage environment for the makeup applicator 10, preventing contamination or crushing issues that could result from storing it with other makeup tools. Given that an applicator is soft and directly contacts the skin, its requirements forcleanliness and isolation are higher. By locating the storage box 414 on the back side 4082 of the divider 408, not only are the applicator’ s special storage needs met, but the rear space of the divider 408 — often neglected in conventional designs — is effectively utilized. Second, the modular design of the storage box 414 lets the user selectively utilize it according to actual needs. Through fastening means, the base 418 can be connected to the divider 4082, enabling quick removal or replacement of the storage box 414 for cleaning or customizing the storage function. This modular design significantly boosts the bag’s flexibility and adaptability.

[0089] Moreover, this design further optimizes user experience via the flipping function of the divider 408. When flipped into the upper portion 401, the position and function of the storage box 414 become more flexible, and users can swiftly access the makeup applicator or other items. When flipped into the lower portion 402, the storage box 414 is concealed inside the bag, forming a fully enclosed secure storage environment. The breathable vents 416 on the lid 417 provide additional ventilation and moisture protection for storing the applicator, ensuring it remains clean and hygienic at all times.

[0090] In summary, this embodiment’s smaller storage box 414, through its innovative placement on the back side 4082 of the divider 408, furnishes an independent and sanitary storage space for the makeup applicator 10 while maintaining the overall compactness of the cosmetic bag 400. It avoids any contact between the applicator and other makeup tools, and simultaneously achieves effective use of the back side of the divider. By means of modular design, a flipping function, and the optimized arrangement of vents 416, this design resolves the issues of inconvenient storage, insufficient cleanliness, and low space utilization found in existing cosmetic bags, offering users a fully featured, convenient, and flexible solution for storing makeup tools.

[0091] Referring to FIGS. 26-27, these show further details of the smaller storage box 414. For instance, four breathable vents 416 are arranged in central symmetry on the lid 417, and the storage box 414 likewise includes a pivot joint 419 (e.g., a hinge) for selectively opening orclosing the lid 417, as well as a receiving space 420 jointly defined by the lid 417 and the base 419 for storing the aforementioned makeup applicator 10 or other makeup tools.

[0092] All the embodiments described above, as well as the technical features in each embodiment, can be reasonably combined without evident conflict to achieve similar or alternative technical solutions. For brevity, all possible combinations of features in the above embodiments are not exhaustively described. However, insofar as there is no contradiction in combining these technical features, they should be considered within the scope described herein.

Claims

What is claimed is:

1. A makeup applicator, comprising:a substantially flat base;a porous flexible body; andan application outer layer comprising at least a flat portion and at least a curved portion, the curved portion being circumferentially arranged around said at least a flat portion;wherein the peripheral edge of the base and the peripheral edge of the application outer layer are connected and jointly define a receiving space for accommodating the flexible body;wherein at least a portion of the curved portion of the application outer layer comprises a group of curved surfaces, the group of curved surfaces comprising three types of gaussian surfaces, and the product of the gaussian curvatures of any two adjacent surfaces in the group of curved surfaces is not greater than zero.

2. The makeup applicator of claim 1, wherein the application outer layer is configured to perform makeup actions of powder pickup and / or powder release.

3. The makeup applicator of claim 1, wherein the material for making the application outer layer comprises polyurethane (PU), latex, silicone, velour, microfiber, activated carbon, sponge, cotton, or a combination of these materials.

4. The makeup applicator of claim 1, wherein the application outer layer has micro-pores with pore diameters between 200 pm and 0.1 mm.

5. The makeup applicator of claim 1, wherein the flexible body is made of a sponge material.

6. The makeup applicator of claim 1, wherein the ratio of the average thickness of theapplication outer layer to the average thickness of the flexible body is between 1 / 8 and 1 / 3.

7. The makeup applicator of claim 1, wherein the makeup applicator’s hardness exhibits a gradient distribution in a single direction.

8. A makeup applicator, comprising:a substantially flat base;a porous flexible body; andan application outer layer comprising at least a flat portion and at least a curved portion, the curved portion being circumferentially arranged around said at least a flat portion;wherein the peripheral edge of the base and the peripheral edge of the application outer layer are connected and jointly define a receiving space for accommodating the flexible body;wherein at least a portion of the curved portion of the application outer layer comprises a group of curved surfaces that includes at least one saddle surface.

9. The makeup applicator of claim 8, wherein the application outer layer is configured to perform makeup actions of powder pickup and / or powder release.

10. The makeup applicator of claim 8, wherein the material for making the application outer layer comprises polyurethane (PU), latex, silicone, velour, microfiber, activated carbon, sponge, cotton, or a combination of these materials.

11. The makeup applicator of claim 8, wherein the application outer layer has micro-pores with pore diameters between 200 pm and 0.1 mm.

12. The makeup applicator of claim 8, wherein the flexible body is made of a sponge material.

13. The makeup applicator of claim 8, wherein the ratio of the average thickness of the application outer layer to the average thickness of the flexible body is between 1 / 8 and 1 / 3.

14. The makeup applicator of claim 8, wherein the makeup applicator’s hardness exhibits a gradient distribution in a single direction.

15. A makeup applicator, comprising:a substantially flat base;a porous flexible body; andan application outer layer comprising at least a flat portion and at least a curved portion, the curved portion being circumferentially arranged around said at least a flat portion;wherein the peripheral edge of the base and the peripheral edge of the application outer layer are connected and jointly define a receiving space for accommodating the flexible body;wherein at least a portion of the curved portion of the application outer layer comprises a group of curved surfaces that defines a first type of operating region and a second type of operating region, the first type of operating region and the second type of operating region being configured so as to simultaneously perform makeup application actions on the user’s under-eye area and nasal root area.

16. The makeup applicator of claim 15, wherein the application outer layer is configured to perform makeup actions of powder pickup and / or powder release.

17. The makeup applicator of claim 15, wherein the material for making the application outer layer comprises polyurethane (PU), latex, silicone, velour, microfiber, activated carbon, sponge, cotton, or a combination of these materials.

18. The makeup applicator of claim 15, wherein the application outer layer has micro-pores with pore diameters between 200 pm and 0.1 mm.

19. The makeup applicator of claim 15, wherein the flexible body is made of a sponge material.

20. The makeup applicator of claim 15, wherein the ratio of the average thickness of the application outer layer to the average thickness of the flexible body is between 1 / 8 and 1 / 3.

Images