A hair treatment apparatus

Abstract

: A hair treatment apparatus for treating hair extending in a hair direction. The hair treatment apparatus includes an air outlet system for directing an air flow away from the hair treatment apparatus. The air outlet system is positioned around an air inlet of the hair treatment apparatus, and is configured to control the air flow to lack rotational symmetry about any axis originating at the hair treatment apparatus and extending parallel to any output air flow direction.

Description

[0001] A HAIR TREATMENT APPARATUS

[0002] FIELD OF THE INVENTION

[0003] The present invention relates to the field of haircare.

[0004] BACKGROUND OF THE INVENTION

[0005] Hair treatment apparatus and devices have long been used for influencing the appearance of hair. A subset of such devices, such as hair dryers and some stylers, employ air flow to manipulate hair in desired ways. Traditional hair dryers, for instance, direct a stream of heated air towards the hair to remove moisture and aid in styling.

[0006] US2013 / 269205A1 discloses an apparatus comprises a hair-treatment device, a vacuum assembly and a blower assembly. The hair-treatment device includes a passage for directing a drying-air stream generated by the blower assembly toward the hair of a subject, and a passageway for directing a return-air stream away from the subject's hair under a motive force supplied by the vacuum assembly.

[0007] In the context of the present disclosure, hair treatment is considered to refer to any interaction with hair that affects its appearance, structure, or condition. This may include, but is not limited to, processes such as washing, drying, styling, cutting, coloring, straightening, curling, or applying hair care product. Hair treatment may be performed for cosmetic purposes, maintenance of hair health, or addressing specific hair-related concerns.

[0008] One challenge in the field of haircare is achieving uniform and effective treatment. A hair treatment apparatus that addresses any such challenge would improve overall hair care outcomes.

[0009] SUMMARY OF THE INVENTION

[0010] The invention is defined by the claims.

[0011] In accordance with a proposed approach, there is provided a hair treatment apparatus for interacting with hair extending in a hair direction. The hair treatment apparatus comprises an air outlet system for directing an air flow away from the hair treatment apparatus in one or more output air flow directions; and an air inlet for drawing air into the hair treatment apparatus, wherein the air outlet system is positioned around the air inlet. The air outlet system is configured to control the air flow to have asymmetric rotational symmetry about every axis

[0012] 1 2024PF00649that both originates at the hair treatment apparatus and extends parallel to any output air flow direction.

[0013] This approach provides a hair treatment apparatus having an air outlet system that, when delivering an air flow, produces a rotationally asymmetric output air flow around an air inlet. In other words, the air flow pattern produced by the apparatus lacks rotational symmetry when rotated about any air flow axis. This creates an intentionally non-uniform distribution of air. In particular, it has been recognized that a rotationally asymmetric air flow will (at least if appropriately oriented) reduce a risk of flyaways by reducing a risk of hair ends being blown away by the hair treatment apparatus.

[0014] More generally, a rotationally asymmetric air flow allows for targeted and controlled air distribution, which may enhance styling precision, improve hair treatment efficacy, and provide users with greater control over the hair drying and styling process.

[0015] More preferably, the air outlet system is configured such that air flow away from the air treatment apparatus lacks rotational symmetry about any axis parallel to any output air flow direction, wherein an output air flow direction is a path along which air moves as it is expelled from the hair treatment apparatus. By lacking rotational symmetry about these axes, the air flow maintains its asymmetric properties throughout its entire path from the device to the hair. This design ensures that the intended styling effects and / or reduced risk of flyaways are consistently achieved, regardless of how the user manipulates the device during use.

[0016] This approach is thereby distinguished from conventional hair dryers or stylers that typically produce more uniform, rotational symmetric air flows (e.g., air flows with a circular cross-section or rectangular cross-section).

[0017] The air outlet system is positioned around an air inlet on / at the front side of the hair treatment apparatus. In this way, when an air flow is present and the user uses the hair treatment apparatus, the user’s hair may be drawn towards the air inlet, e.g., such that the user’s hair is drawn to a region delimited by the air inlet. In this way, when the user moves the treatment apparatus, the user’s hair may move along the surface of the air inlet. This is advantageous, as hair may be smoothed by moving along the surface of the air inlet together with the effect of the air flow.

[0018] In the context of the present disclosure, an output air flow direction lies along a straight path along which air initially moves as it is expelled from the hair treatment apparatus, i.e., passes out of an air outlet window. Thus, an output air flow direction is a linear direction. It will be appreciated that an air flow may curve after being expelled in an initial direction (e.g., as later exemplified).

[0019] 2 2024PF00649In some examples, the air outlet system comprises an upper portion configured to direct air flow away from the upper portion in one or more first output air flow directions away from the hair treatment apparatus; and a lower portion configured to prevent air flow from being directed away from the lower portion in any direction that makes less than a predetermined non-zero angle with respect to any first output air flow direction away from the hair treatment apparatus.

[0020] By controlling the air flow direction, particularly from the lower portion of the device, the apparatus helps reduce the occurrence of flyaway hairs. This feature may contribute to a smoother, more polished final hairstyle.

[0021] In some examples, the air outlet system is configured to guide at least some of the air flow from the air outlet system towards the air inlet. This helps provide an air flow for retaining a user’s hair close to the air inlet.

[0022] In some examples, the air outlet system (completely) surrounds the air inlet. This provides more comprehensive coverage of air in the vicinity of the air inlet.

[0023] The air outlet system may comprise: a top portion surrounding a top part of the air inlet configured to output a first air flow in one or more first air flow directions towards a user or inwardly towards the air inlet; and a bottom portion surrounding a bottom part of the air inlet, wherein the bottom portion is arranged to output downwards a second air flow away from the air inlet.

[0024] Providing a downwardly directed air flow helps to smooth and straighten hair as it falls naturally, functioning to reduce a risk of frizz and flyaways.

[0025] In some examples, the air outlet system takes an annular shape and a cross-sectional shape of the air flow directed by the air outlet system is a segment of the annular shape. The annular shape with segmented air flow provides a unique and effective air distribution pattern. This design allows for precise control over the air flow direction and intensity, enhancing the device's styling capabilities.

[0026] In some examples, the hair treatment apparatus further comprises a rotational attachment for rotatably attaching the hair treatment apparatus to a handle portion. In such examples, the hair treatment apparatus may be configured to, at least during use of the hair treatment apparatus, bias the orientation of the air outlet system to a predefined orientation with respect to gravity and / or the hair direction.

[0027] The present disclosure thereby provides a hair treatment apparatus with a biasing capability for orienting an air outlet system at a desired orientation. This helps to maintain a consistency in the positioning of air flow provided by the air outlet system. This

[0028] 3 2024PF00649advantageously improves a consistency of the performance of hair treatment system even as it is manipulated and moved over the head of the user, allowing a user to position (for instance) a handle at any desired orientation whilst still achieving a consistent air flow pattern.

[0029] In some examples, where the air outlet system comprises an upper and lower portion as previously embodied, the hair treatment apparatus is configured to, at least during use of the hair treatment apparatus, bias the lower portion towards a lowermost position of the hair treatment apparatus with respect to gravity and / or the hair direction. This reduces an air flow applied to a hair ends during use of the hair treatment apparatus, reducing a risk of flyaways.

[0030] In some examples, the hair treatment apparatus is weighted such that a gravitational force biases the orientation of the air outlet system to the predefined orientation with respect to gravity and / or the hair direction. The weighted design provides a passive biasing mechanism that requires no user intervention.

[0031] In some examples, the hair treatment apparatus comprises an actuator system configured to actively control a rotation of the air outlet system, with respect to the handle portion, to bias the orientation of the air outlet system to the predefined orientation with respect to gravity and / or the hair direction. The active control provided by the actuator system offers precise and dynamic adjustment of the air outlet system's orientation.

[0032] In some examples, the hair treatment apparatus further comprises a hair engagement element for contacting the hair, wherein the hair engagement element is configured such that movement of the hair treatment apparatus in the hair direction, when the hair engagement element contacts the hair, biases the orientation of the air outlet system to the predefined orientation with respect to gravity and / or the hair direction.

[0033] The hair engagement element provides a mechanism that responds to the natural movement of the device through hair. This feature enables movement or rotation of the hair treatment apparatus using an inherent functionality of the hair treatment apparatus for improved efficiency.

[0034] In some examples, the rotational attachment comprises a pivot or bearing for connecting the hair treatment apparatus to the handle portion. The pivot or bearing connection allows for smooth rotation of the hair treatment apparatus.

[0035] In some examples, the rotational pivot is configured to permit rotation of the hair treatment apparatus, with respect to the handle portion, in at least two separate planes. The multi-plane rotation capability significantly increases the device's range of motion and

[0036] 4 2024PF00649versatility. This feature allows users to easily adapt the device's orientation to various hair styling needs and head contours.

[0037] In accordance with another proposed approach, there is provided a hair treatment device comprising the hair treatment apparatus of any one of the previous examples and a handle.

[0038] In some examples, the hair treatment device comprises an air flow generator for drawing air through the air inlet and outputting air through the air outlet.

[0039] These and other aspects of the invention will be apparent from and elucidated with reference to the embodiment s) described hereinafter.

[0040] BRIEF DESCRIPTION OF THE DRAWINGS

[0041] For a better understanding of the invention, and to show more clearly how it may be carried into effect, reference will now be made, by way of example only, to the accompanying drawings, in which:

[0042] Figure 1 provides a perspective view of a hair treatment apparatus; Figure 2 provides a side view of the hair treatment apparatus;

[0043] Figure 3 provides a perspective view of a variant hair treatment apparatus with segmented air outlet windows;

[0044] Figure 4 provides a perspective view of another variant hair treatment apparatus with a single annular segment air outlet window;

[0045] Figure 5 provides a perspective view of another variant hair treatment apparatus; Figure 6 provides a side view of the hair treatment apparatus shown in Figure 5; Figure 7 provides a view of another proposed hair treatment apparatus;

[0046] Figure 8 provides a perspective view of another hair treatment apparatus with air guiding elements;

[0047] Figure 9 illustrates a hair treatment device with a hair treatment apparatus at a first orientation with respect to a handle portion;

[0048] Figure 10 illustrates the hair treatment device with the hair treatment apparatus at a second orientation with respect to the handle portion; and

[0049] Figure 11 illustrates another hair treatment device.

[0050] DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The invention will be described with reference to the Figures.

[0052] 5 2024PF00649It should be understood that the detailed description and specific examples, while indicating exemplary embodiments of the apparatus, systems and methods, are intended for purposes of illustration only and are not intended to limit the scope of the invention. These and other features, aspects, and advantages of the apparatus, systems and methods of the present invention will become better understood from the following description, appended claims, and accompanying drawings. It should be understood that the Figures are merely schematic and are not drawn to scale. It should also be understood that the same reference numerals are used throughout the Figures to indicate the same or similar parts.

[0053] As used herein, a direction is defined by a vector originating from a particular point and extending outward along a straight path through space, which path has a particular orientation. Different directions may differ in terms of their points of origin and / or orientation. Thus, two different directions may run parallel to one another, but have different points of origin. Similarly, two different directions may originate from a same location or point, but have different orientations.

[0054] The invention provides a hair treatment apparatus for treating hair extending in a hair direction. The hair treatment apparatus includes an air outlet system for directing an air flow away from the hair treatment apparatus. The apparatus also comprises a rotational attachment for rotatably attaching the hair treatment apparatus to a handle portion, and is configured to, at least during use of the hair treatment apparatus, bias the orientation of the air outlet system to a predefined orientation with respect to gravity and / or the hair direction.

[0055] In other words, the air outlet system is designed to produce an air flow pattern that is not symmetrical when rotated around any axis extending from the device. This asymmetry in the air flow distribution allows for more targeted and controlled hair treatment, functioning to improve styling outcomes and reducing issues like flyaway hairs.

[0056] Figures 1 and 2 illustrates an example hair treatment apparatus 100 for interacting with hair (not illustrated in Figure 1) extending in a hair direction.

[0057] The air treatment apparatus comprises an air outlet system 110 configured to direct, control or deliver an air flow away from the hair treatment apparatus.

[0058] The air outlet system 110 faces a front side 191 of the air treatment apparatus 100, such that the air flow delivered by the air outlet system 110 exits and is directed away from the front side 191, i.e., in one or more output air flow directions. The front side 191 is the side that will face user’s hair when the apparatus is used by the user.

[0059] It will therefore be appreciated that the air outlet system 110 may comprise one or more air outlet windows 119 (e.g., apertures or meshes) through which air flow is directed

[0060] 6 2024PF00649by the air outlet system. Thus, each air outlet window is configured to direct a respective air flow out of the hair treatment apparatus.

[0061] The air outlet system 110 (e.g., the air outlet window(s) 119 thereof) is configured (e.g., arranged and / or position) such that air flow from the front side 191 of the air treatment apparatus lacks rotational symmetry about any axis parallel to any output air flow direction. As used herein, the term "output air flow direction" refers to a straight path along which air initially moves as it is expelled from the hair treatment apparatus, i.e., passes out of an air outlet window. This direction may be defined by a vector indicating both the orientation and origin.

[0062] In particular, the air outlet window(s) 119 of the air outlet system 110 may be configured (e.g., arranged and / or position) such that air flow from the front side 191 of the air treatment apparatus lacks rotational symmetry about any axis extending parallel to any output air flow direction.

[0063] Put another way, a cross-sectional shape of the air flow from the air outlet system, taken perpendicularly to the air flow, may be rotationally asymmetric.

[0064] In some examples, the air outlet system 110 is designed such that the air flow has asymmetric rotational symmetry about every axis originating at and extending away from the hair treatment apparatus. In other words, the air flow pattern may lack rotational symmetry when rotated about any axis extending from the device, creating an intentionally non-uniform distribution of air delivery by the air outlet system.

[0065] The air outlet window(s) 119 of the air outlet system 110 may be configured (e.g., arranged and / or position) such that air flow from the front side 191 of the air treatment apparatus lacks rotational symmetry about any axis extending away from the front side 191 of the air treatment apparatus.

[0066] In this way, the shape taken by the combination of all air outlet windows 119 may have asymmetrical rotational symmetry about any axis extending away from the air treatment apparatus, e.g., any axis parallel to any output air flow direction such as a primary output air flow direction DI of air output through the air outlet window(s) 119.

[0067] In some examples, a collective arrangement or grouping of the one or more air outlet openings or apertures within the air outlet system of the hair treatment apparatus may take a rotationally asymmetric shape.

[0068] As used herein, the term "direction of primary air flow" may refer to the predominant or main direction in which air is expelled from the hair treatment apparatus

[0069] 7 2024PF00649through the air outlet system. This direction may typically be oriented away from the front side of the apparatus, which faces the user's hair during operation.

[0070] The resulting asymmetric rotational symmetry means that as the apparatus is rotated about any axis parallel to an output air flow direction, the air flow pattern will not remain consistent until a full 360° has occurred. This unique characteristic distinguishes the apparatus from traditional hair dryers or stylers that produce more uniform, radially symmetric air flows.

[0071] In the illustrated example, each air outlet window 119 is positioned around a segment (i.e., and not all) of a hypothetical annulus or circle, i.e., arranged around a non-whole segment of a circle. This defines an asymmetric shape of the air outlet system and a corresponding rotational asymmetry of the air flow.

[0072] More generally, the air outlet system 110 may comprise one or more air outlet windows that together form a shape having rotational asymmetry (e.g., within any plane parallel to front side of the hair treatment apparatus).

[0073] In some examples, the air outlet system 110 comprises an upper portion 111 configured to direct air flow away from the upper portion. Correspondingly, the air outlet system 110 may comprise a lower portion 112 configured to prevent air flow from being directed from the lower portion in any direction that makes less than a predetermined non-zero angle with respect to any output air flow direction DI away from the hair treatment apparatus.

[0074] In this way, the air flow will have asymmetric rotational symmetry (e.g., about any axis parallel to the output air flow direction or, preferably, about any air flow direction). This advantageously provides a mechanism for performing asymmetric treatment of hair, e.g., to reduce a risk of air flow being applied to hair ends to thereby reduce a risk of flyaways and / or to achieve an asymmetric styling or treatment of the hair.

[0075] In the context of the present disclosure, the term “top”, “upper”, “bottom”, “lower”, should be interpreted as, when in use, the user moves the front side of the hair treatment apparatus 100 along hair for applying air flow to hair, an upper or top element is intended to be closer to the root of user’s hair than a bottom or lower element.

[0076] The asymmetric rotational symmetry about any output air flow direction means that regardless of the specific path or trajectory the air takes as it exits the air outlet system, it will maintain its non-uniform distribution with respect to the air outlet system. This characteristic ensures that the air flow remains consistently asymmetric throughout its entire path from the device to the user's hair.

[0077] 8 2024PF00649The hair treatment apparatus 100 comprises an air inlet 130 for drawing air into the hair treatment apparatus.

[0078] In some examples, the air outlet system is configured to control the air flow to have asymmetric rotational symmetry about one or more first directions both that originate at the air inlet and extend away from the air inlet. More particularly, the air inlet 130 may lie in an air inlet plane. The first directions DI may lie perpendicular to this first plane. Moreover, preferably, the rotation axis R1 may (e.g., also) lie perpendicular to this first plane.

[0079] In this way, the air outlet system 110 and the air inlet 130 are both positioned at the front side 191 of the hair treatment device 100.

[0080] It will be appreciated that, in use, a user’s hair may be drawn towards the air inlet (as the air inlet is at the front side 191 of the hair treatment device 100). This may improve the performance of a hair treatment process.

[0081] The air inlet 130 here comprises an air inlet window 131 and a grill 132 that covers the air inlet window 131. The air inlet 130 is positioned at the front side 191 of the hair treatment apparatus 100.

[0082] The air outlet system 110 is positioned around, e.g., to surround, the air inlet 130.

[0083] In particular, where the air outlet system 110 comprises the upper portion 111 and the lower portion 112, the upper portion may surround (at least) a top part and / or side (e.g., left and / or right) parts of the air inlet 130 and the lower portion 112 may surround a bottom part of the air inlet 130.

[0084] The air outlet system 110 may be configured to guide at least some of the air flow from the air outlet system towards the air inlet. This configuration creates a recirculating air flow pattern that is able enhance the efficiency and effectiveness of the hair treatment apparatus. In particular, the circular air flow pattern helps to contain hair within the treatment area, reducing flyaways and providing better control during styling.

[0085] In some examples, the air outlet system comprises one or more curved surfaces 118 between the air output window(s) and the air inlet 130 to help guide airflow into the air inlet. More specifically, the curved surface(s) may exploit the Coanda effect to facilitate air flow recirculation. An air flow tends to follow the contour of a curved surface due to the Coanda effect. Thus, as the air exits the air outlet window(s) along an initially straight path, it may adhere to the curved surface(s) between the air outlet window(s) and the air inlet. This adherence causes at least some of the air flow to curve inward towards the air inlet, rather than dispersing outward.

[0086] 9 2024PF00649In some examples, as illustrated, the air outlet system 110 takes an annular shape. More particularly, a cross-sectional shape of the air flow directed by the air outlet system is a segment of the annular shape, e.g., to not include a full annulus so as to have rotational asymmetry.

[0087] The hair treatment apparatus 100 may comprise a rotational attachment 120 for rotatably attaching the hair treatment apparatus to a handle portion 195.

[0088] The rotational attachment may, for instance, permit the hair treatment apparatus to rotate about a (first) rotation axis R1. In some examples, the rotational attachment may allow free or unrestricted rotation about the (first) rotation axis Rl. The rotation axis R1 may be aligned with (e.g., parallel to) at least one the output air flow direction. As later explained, this allows the hair treatment apparatus to rotate with respect to the handle portion 195 while maintaining a desired or orientation of the air flow pattern relative to the user's hair.

[0089] More particularly, the rotation axis Rl may be oriented perpendicular to the front side 191 of the hair treatment apparatus, allowing the air flow pattern to be rotated in a plane parallel to the user's hair or scalp. This orientation may distinguish Rl from axes that would rotate the device in other planes.

[0090] For instance, the rotational attachment may comprise a (soft) magnetic coupling that allows a free or unrestricted rotation of the hair treatment apparatus with respect to the handle portion 195. As another example, the rotational attachment may comprise a bearing for permitting rotation of the hair treatment apparatus with respect to an attached handle portion. Other examples will be apparent to the skilled person.

[0091] In some examples, the hair treatment apparatus is configured to, at least during use of the hair treatment apparatus, bias the orientation of the air outlet system to a predefined orientation with respect to gravity and / or the hair direction.

[0092] The orientation of the air outlet system may be defined by the rotation of the hair treatment apparatus about the rotational attachment. In other words, as the hair treatment apparatus rotates about the rotational attachment, assuming all other components remain stationary, so the orientation of the air outlet system with respect to gravity and / or the hair direction will change.

[0093] In examples where the air outlet system 110 comprises the upper portion 111 and the lower portion 112, the hair treatment apparatus may be configured to, at least during use of the hair treatment apparatus, bias the lower portion towards a lowermost position of the hair treatment apparatus with respect to gravity and / or the hair direction.

[0094] 10 2024PF00649This approach advantageously puts the (air blocking) lower power 112 at a lowermost position during use of the hair treatment apparatus. This significantly reduces a risk and / or amount of an output air flow being applied to hair ends (and thereby reduced risk of flyaways).

[0095] A first approach for configuring the hair treatment apparatus to bias the orientation of the air outlet system is to appropriately weight the hair treatment apparatus. In particular, the hair treatment apparatus may be weighted such that a gravitational force biases the orientation of the air outlet system to the predefined orientation with respect to gravity and / or the hair direction.

[0096] In particular, the rotational attachment may define a (first) rotation axis R1 about which the hair treatment apparatus is configured to rotate. This rotation axis R1 is preferably parallel to at least one output airflow direction. By having the rotation axis parallel to this direction of airflow, the apparatus is able to maintain its intended air distribution pattern as it rotates. This configuration allows the air outlet system to consistently orient itself relative to the hair and scalp during use, regardless of any user manipulation.

[0097] The center of gravity Cl of the hair treatment apparatus may be positioned (through appropriate weighting and / or construction of the hair treatment apparatus) to be displaced from this rotation axis Rl. This will naturally cause a gravitational force to bias the orientation of the air outlet system to a particular (desired) position.

[0098] Of course, the rotational attachment may be designed such that a frictional force between the hair treatment apparatus and the handle portion (when rotatable attached thereto) is not sufficient to overcome the rotational force imparted by gravity.

[0099] By way of example, where the air outlet system 110 comprises the upper portion 111 and the lower portion 112, the center of gravity may be positioned in a region originating at the rotation axis and including the lower portion 112. More specifically, the center of gravity Cl may be positioned: between the rotation axis Rl and the lower portion; in the lower portion 112; or such that lower portion 112 lies between the rotation axis and the center of gravity Cl.

[0100] Such a technique will result in the lower (blocking) portion being at a lowermost position during use of the hair treatment apparatus, reducing a risk of flyaways as previously explained.

[0101] In a second approach, the hair treatment apparatus comprises an actuator system configured to actively control a rotation of the air outlet system, with respect to the handle portion, to bias the orientation of the air outlet system to the predefined orientation with respect to gravity and / or the hair direction.

[0102] 11 2024PF00649In particular, the actuator system may comprise one or more motors or other actuating mechanisms to adjust the orientation of the air outlet system. Suitable examples of appropriate actuating mechanisms for rotating an air outlet system will be readily apparent to the skilled person, e.g., employing one or more electric motors or the like. The operation of the actuating mechanism(s) may be controlled by a control unit of the actuator system.

[0103] In some examples, the actuator system may incorporate one or more sensors to monitor changes in rotation of the air outlet system. The sensor(s) may detect absolute or relative changes in orientation, which functions as feedback for controlling (by the control unit) of the orientation of the air outlet system to a desired orientation.

[0104] By way of example, the sensor(s) may comprise one or more accelerometers or gyroscopes for measuring absolute changes in orientation (e.g., relative to gravity). The actuating mechanism(s) may be controlled by the control unit to maintain a desired orientation by using feedback from any such sensor(s) to maintain a desired orientation of the air outlet system.

[0105] Such an approach is able to perform active maintenance of the orientation of the air outlet system to the predefined orientation.

[0106] In some examples, the hair treatment apparatus may comprise a system of ducting or air channels configured to permit rotation of the air outlet system while maintaining continuous airflow. This system may comprise: flexible ducting (e.g., which is able to bend and twist as the air outlet system rotates); a rotary joint or swivel connection (e.g., at the interface between the stationary and rotating portions of the apparatus); a rotating manifold and so on. Other examples will be readily apparent to the appropriately skilled person.

[0107] In a third approach, the hair treatment apparatus comprises a hair engagement element for contacting the hair. The hair engagement element is configured such that movement of the hair treatment apparatus in the hair direction, when the hair engagement element contacts the hair, biases the orientation of the air outlet system to the predefined orientation with respect to gravity and / or the hair direction.

[0108] In this way, hair may exert a reaction force on the hair treatment apparatus (as the hair engagement element moves or is moving through the hair) to provide a rotational force for rotating the hair treatment apparatus.

[0109] By way of example, the hair engagement element may comprise one or more brushes and / or bristles. As the brush(es) and / or bristle(s) are moved through the hair (e.g., in a hair direction), a natural reaction force will oppose a movement of the brush(es) and / or bristle(s)

[0110] 12 2024PF00649through the hair, which reaction force will impart a rotational force to encourage or bias the hair treatment apparatus to rotate about its rotation axis.

[0111] In general, as the apparatus moves through the hair, the resistance encountered by the brush(es) and / or bristle(s) creates a rotational moment. This moment causes the apparatus to pivot around its rotation axis, aligning it to a preferred orientation. The design takes advantage of the hair's inherent resistance to a contacting element and the user's natural styling motions. For example, when brushing downward along long hair, the resistance will tend to rotate the lower portion of the device towards the bottom. This may help maintain the desired air flow pattern, with reduced air flow near the hair ends to prevent flyaways.

[0112] In some examples, the hair engagement element may comprise one or more hair guiding elements, e.g., for defining a channel in which hair is to be positioned with respect to the hair treatment apparatus for treatment. The hair guiding element(s) may interact with the hair in a similar manner to the brush(es) and / or bristle(s) previously disclosed.

[0113] Of course, any suitable combination of any two or more of the aforementioned approaches may be employed in some variants of the hair treatment apparatus.

[0114] Thus, the air outlet system may be configured to control the air flow output from the air outlet system to have asymmetric rotational symmetry about any output air flow direction originating from the upper portion 111 of the air outlet system.

[0115] For the purposes of the illustrated example, the hair treatment apparatus 100 takes the form of an attachment for a handheld haircare device (e.g., a hair dryer). The attachment may be removably coupled to the haircare device. More particularly, the rotational attachment may provide a detachable connection to the hair care device.

[0116] However, in other examples, the hair treatment apparatus 100 forms an integral part of the hair care device, i.e., is not detachable. This forms or defines a hair treatment device comprise at least a handle and any proposed hair treatment apparatus 100.

[0117] An air flow generator, for generating and controlling an air flow through the air outlet system, may be formed in the hair treatment apparatus 100 or externally thereto. For instance, the air flow generator may be integrated directly into the apparatus 100, allowing for a compact and self-contained design. Alternatively, it may be located externally, e.g., in a separate base unit or handle to which the apparatus 100 attaches.

[0118] In particular, the air flow generator may be configured to draw air through the air inlet 130 and expel it through the air outlet system 110, specifically through the air outlet window(s). This configuration creates a continuous air flow path through the hair treatment apparatus.

[0119] 13 2024PF00649The air flow generator may comprise a fan or impeller. This configuration allows for precise control over air flow characteristics such as speed and volume directly at the point of use. It may also incorporate heating elements to provide warm air flow options for drying and styling.

[0120] In example in which the air flow generator is external to the apparatus 100, it may be housed in a larger unit that provides additional power and functionality.

[0121] Regardless of its location, the air flow generator may cooperate with the air outlet system to produce the desired rotationally asymmetric air flow. In particular, the air treatment apparatus may comprise one or more ducts or channels for fluidically connecting the air flow generator to the air outlet system.

[0122] In some examples, the air flow generator may comprise a heater for heating the air flow. The heater may be positioned within / before / after the air flow path to warm the air that passes through the generator.

[0123] In some examples, if present, the rotational attachment 120 is configured to permit rotation of the hair treatment apparatus, with respect to the handle portion, in at least two separate planes.

[0124] One plane of rotation may include at least a rotation in a plane parallel to a front side of the hair treatment apparatus. Such rotation enables the device and its output air flow to maintain its orientation relative to the user's hair even as a handle portion is rotated.

[0125] More particularly, the rotation in this plane is particularly important for maintaining the positioning of the upper and lower portions (when present) of the air outlet system. As the user manipulates the device, this rotation ensures that the upper portion remains oriented towards the roots of the hair, while the lower portion, which may block or redirect air flow, stays positioned near the hair ends. This consistent orientation is crucial for achieving the intended styling effects and reducing the risk of flyaways.

[0126] Another plane of rotation might allow the device to pivot vertically, e.g., to facilitate adjustment of the angle of air flow relative to the scalp. Another plane of rotation might allow the device to pivot horizontally.

[0127] A number of variants to the previously described hair treatment apparatus are hereafter described. Elements that may be embodied in the same manner as previously described have not been repeated for the sake of conciseness. More particularly, for the interest of brevity and clarity, the description of these variants focuses primarily on the elements that differ from the earlier embodiments. Features and components that remain consistent with previous descriptions are not reiterated in detail.

[0128] 14 2024PF00649Figure 3 illustrates a variant hair treatment apparatus 300, having a different air outlet system 310. Other elements of the hair treatment apparatus may remain (substantially) the same as in any previously described embodiment.

[0129] In particular, the air outlet system 310 here comprises a plurality of (separable) annular segments 313, 314, 315 of an air outlet window for outputting a respective air flow. Each annular segment is positioned upon a hypothetical segment of an annulus / circle. Each annular segment functions as an air outlet window for the hair treatment apparatus, i.e., a window through which an air flow is directed by the air outlet system 310. The combination of the air outlet windows is rotationally asymmetric about every axis extending away from the hair treatment apparatus.

[0130] More specifically, the air outlet system 310 is configured in the form of an annular portion surrounding the air inlet 130. The air outlet system 310 comprises an upper portion 311 surrounding at least an upper or top part of the air inlet 130, and a lower portion 312 surrounding a bottom part of the air inlet.

[0131] More specifically, the upper portion 311 here comprises a top portion 313 A having a first annular segment 313 surrounding an upper or top part of the air inlet.

[0132] The upper portion 311 may comprise two middle portions 314A, 315A that surround the left side of the air inlet 130 and the right side of the air inlet 130 respectively, e.g., each comprising a respective annular segment 314, 315.

[0133] Each middle portion 314A, 315 A is upwardly connected to the top portion 313 A and downwards connected to the lower portion 312 respectively. The top portion 313 A and the middle portions 314A and 315 A are thereby collectively referred to as upper portion 311. The upper portion 311 (including top portion 313 A and the two middle portions 314A and 315A) and the lower portion 312 together form the annular portion, i.e., the air outlet system.

[0134] In some examples, the middle portions 314A, 315A of the upper portion 311 are omitted. Thus, the air outlet system may comprise only the top portion 313 A and the lower portion 312, creating a simplified design with a more pronounced asymmetry in the air flow pattern. This configuration allows for more targeted air flow control and potentially enhance the device's ability to manage flyaways and achieve specific styling effects.

[0135] In the context of the present invention, the term “top”, “upper”, “bottom” should be interpreted as, when in use, the user moves the front side of the hair treatment apparatus 300 along hair for applying air flow to hair, the upper portion of the annular portion is intended to be closer to the root of user’s hair than the lower portion. Similarly, the term “top portion” means when in use the top portion is intended to be at the top and is closest to the root

[0136] 15 2024PF00649of user’ s hair comparing with the other portions of the annular portion. The term “lower portion” means when in use the lower portion is intended to be closest to the tail of the user’s hair than the other portions of the annular portion 304.

[0137] Figure 4 illustrates another variant hair treatment apparatus 400, having a different air outlet system 410. Other elements of the hair treatment apparatus may remain (substantially) the same as in any previously described embodiment.

[0138] In particular, the air outlet system 410 here comprises a single annular segment 415 for outputting a rotationally asymmetric air flow.

[0139] More specifically, the air outlet system 410 is once again configured in the form of an annular portion surrounding the air inlet 130. The air outlet system 410 can be conceptually split into comprises an upper portion 411 surrounding at least an upper or top part of the air inlet 130, and a lower portion 412 surrounding a bottom part of the air inlet.

[0140] More specifically, the upper portion 411 here comprises a single annular segment 415 surrounding an upper or top part of the air inlet, as well as two sides of the air inlet 130.

[0141] Figures 5 and 6 illustrate another hair treatment apparatus 500, having a different air outlet system 510, which comprises an upper portion 511 and a lower portion 512. In particular, the air outlet system 510 differs in the configuration of the lower portion 512. Other elements of the hair treatment apparatus may remain (substantially) the same as in any previously described embodiment.

[0142] The upper portion 511 may be embodied in the form of any previously described upper portion. For the sake of illustration, the upper portion is here formed to comprise a single annular segment 415.

[0143] As previously mentioned, the upper portion 511 is configured to direct air flow from the upper portion in one or more output air flow directions away from the hair treatment apparatus.

[0144] The lower portion 512 is configured to prevent air flow from being directed from the lower portion in any direction that makes less than a predetermined non-zero angle with respect to the any output air flow direction. Here: the lower portion 512 comprises a lower air outlet 512 configured to output an air flow in a second direction D2 that makes a non-zero angle with respect to the output air flow direction DI. In other words, the angle between the output air flow direction DI and the second direction D2 is non-zero. In this way, for the illustrated example, air flow from the lower portion is prevented from being directed in any direction that makes less than an angle of 100° with respect to the output air flow direction.

[0145] 16 2024PF00649In the illustrated example, the non-zero angle is approximately 90° (so that the second direction D2 is substantially perpendicular to the output airflow direction ), but any other suitable non-zero angle (e.g., >10° or more preferably >45°) may be used.

[0146] By directing air flow from the lower portion at an angle, the apparatus reduces the risk of disturbing already styled sections of hair or causing flyaways at the ends of the hair. This can be particularly beneficial when styling longer hair or creating sleek, smooth styles.

[0147] In the illustrated example, the upper portion 511 is configured to comprise a single annular segment 415 that surrounds a maj ority of the air inlet for outputting a rotationally asymmetric air flow.

[0148] However, in other examples, the upper portion 511 is embodied as elsewhere described, e.g., to comprise multiple annular segments or other configurations that maintain the rotationally asymmetric air flow pattern. The specific design of the upper portion may be tailored to achieve particular styling effects or to accommodate different hair types and lengths.

[0149] Figure 7 illustrates another hair treatment apparatus 800. Other elements of the hair treatment apparatus may remain (substantially) the same as in any previously described embodiment.

[0150] In this embodiment, the air outlet system 710 comprises a top portion 711 and a bottom portion 712.

[0151] The top portion 711 is configured to surround only an upper(most) part of the air inlet 130, and is similar to the previously disclosed top portion 313 A (Figure 3). The top portion outputs a first air flow in a direction towards a user or inwardly towards the air inlet (e.g., using a later described air guiding element). Preferably, the first air flow has asymmetric rotational symmetry about any output air flow direction from the top portion 711.

[0152] The bottom portion surrounds a bottom part of the air inlet 130 and is arranged to output downwards a second air flow D2 away from the air inlet 130. The bottom portion may be similar in form and function to the lower portion 512 (Figure 5) previously disclosed.

[0153] Figure 8 illustrates another hair treatment apparatus 800. Other elements of the hair treatment apparatus may remain (substantially) the same as in any previously described embodiment.

[0154] The hair treatment apparatus comprises an air outlet system 810 for directing an air flow away from the hair treatment apparatus. More particularly, the air outlet system 810 is configured to control the air flow to have asymmetric rotational symmetry about every axis originating at and extending away from the hair treatment apparatus.

[0155] 17 2024PF00649The hair treatment apparatus 800 may comprise a rotational attachment 820 for connecting the hair treatment apparatus to a handle portion (not illustrated). The hair treatment apparatus may be configured to, at least during use of the hair treatment apparatus, bias the orientation of the air outlet system to a predefined orientation with respect to gravity and / or the hair direction

[0156] In this example, the air outlet system 810 comprises an upper portion 811 and a lower portion 812. The upper portion 811 configured to direct air flow from the upper portion in one or more output air flow directions away from the hair treatment apparatus. The lower portion 812 is here configured to block air from being directed therethrough, thereby provide a rotationally asymmetrical air flow.

[0157] The hair treatment apparatus also comprise an air inlet 830, through which air is drawn. In use, the hair of a user will be drawn towards the air inlet, e.g., to lie at a region delimited or bound by the air inlet.

[0158] The upper portion 811 surrounds an upper part of the air inlet and the lower portion 812 surrounds a lower part of the air inlet.

[0159] In this illustrated example, the upper portion 811 has a first output portion 813, 814, 815, 819 that is arranged to guide at least part of the air flow output inwardly towards the air inlet. The first output portion comprises an air outlet window 813A, 814A, 815A (e.g., formed from a plurality of window segments) through which air is output. The first output portion 813, 814, 815, 819 also comprises an exterior curving surface 819 that curves from the air outlet window 813 A, 814A, 815A towards the air inlet 830 to guide at least part of the air flow out of the air outlet window towards the air inlet 830.

[0160] It is to be understood that the exterior surface means the outer surface of the hair treatment apparatus directly facing the external environment, the exterior curving surface can have a convex curvature. In such embodiments, the Coanda effect can be utilized, this curving surface can cause more the air to be recirculated back to the air inlet 830. Such recirculation can assist to reduce energy consumption, particularly if the air flow is heated, so that more efficient hair drying can be achieved.

[0161] In the illustrated example, the upper portion 811 comprises a top portion 813 and two side portions 814, 815 that surround the top and sides of the air inlet 830. The air outlet window may thereby be formed from a top portion window 813 A, and two side portion windows 814A, 815A and exterior curving surface 819 may similarly extend to surround the top and sides of the air inlet, e.g., where the exterior curving surface 819 is positioned between the air outlet window and the air inlet 830. In the illustrated example, the exterior curving

[0162] 18 2024PF00649surface 819 is a continuous component and the air outlet window is a segmented component. In other examples, the exterior curving surface is be segmented or formed of multiple discrete components. Similarly, in some examples, the air outlet window may be a continuous component.

[0163] In some examples, the air outlet window 813A, 814A, 815A may initially direct air flow in initial output air flow directions, even though the exterior curving surface 819 subsequently guides at least part of this air flow towards the air inlet 830 in the form of a first flow. This configuration may allow for a balance between providing a directed air flow for styling purposes and creating a recirculating air pattern.

[0164] The hair treatment apparatus may comprise one or more air guiding elements 851, 852 that extend away from the air outlet system, each air guiding system being configured to guide air flow output by the air outlet system towards the air inlet.

[0165] More specifically, each air guiding element 851, 852 is spaced away from the air inlet 830 and is configured to guide an auxiliary air flow towards the air inlet. This auxiliary air flow is spaced apart (in a direction away from the air inlet 830) from the first flow guided by the exterior curving surface 819. The user’s hair may be retained by the auxiliary flow of air proximal to the hair treatment apparatus 800.

[0166] For the purposes of illustrative clarity, these air guiding elements are illustrated as partially transparent. It will be appreciated that, in practice, these air guiding elements may (but not essentially) be opaque.

[0167] Thus, the air guiding element(s) 851, 852, which may each be regarded as an air guiding wing, may assist to provide air behind the user’s hair once the hair is sucked / drawn onto an area of the hair treatment apparatus delimited by the air inlet 830. Such air can be sucked through the hair, which can help to increase drying speed.

[0168] The apparatus 800 may comprise one or more of such air guiding elements, which are arranged around the air inlet 830.

[0169] For example, as shown in Figure 8, the air guiding elements can be in the form of a pair of air guiding elements 851 and 852 spaced apart from, e.g. opposite, each other, with the air inlet 830 being disposed in-between the pair of air guiding elements. In other words, the pair of air guiding elements may be symmetrically positioned on the left and right side of the air inlet 830.

[0170] Such a pair of air guiding elements 851 and 852 can each be arranged at sides of the hair treatment device so as to delimit a central channel 855 for receiving hair. In this way, the central channel can receive hair in the direction in which it naturally falls.

[0171] 19 2024PF00649In particular, each air guiding elements 851 may be configured to receive (a part of) an air flow from the air outlet window 813 A, 814A, 815 A (in the illustrated example, specifically: a respective side portion window 814A, 815 A) and redirect the air flow towards the air inlet 830.

[0172] The openings of the central channel 855 towards the top of the device and towards the bottom of the device, when orientated for use, may be relatively large, to provide air flow along the scalp direction.

[0173] In addition to the rotationally asymmetric air flow, the air guiding elements 851 and 852 further assist to alleviate the issue of hair being blown away from the hair dryer as a consequence of a so-called air multiplier effect caused by the air being guided around (at least) the exterior curving surface entraining air surrounding the outer surface. The latter can cause blowing of hairs, which may not be bundled but rather spread out, out of the drying airstream.

[0174] The one or more air guiding elements 851, 852 may inwardly curve, e.g. inwardly and convexly curve, towards a path taken by the air drawn into the air inlet 830. This arrangement of the air guiding element(s) function to help retain hair proximal to the hair dryer, by effectively providing an air curtain extending transverse to the direction that air is drawn into the air inlet, which air curtain inhibits hair being blown away from the air outlet 810.

[0175] In some embodiments, the, e.g. each of the air guiding element(s) 851 and 852 may protrude beyond the air inlet to reach an extremity 858, 859 spaced apart from the air inlet 830, with the curving surface 819 (if present) being arranged closer to the air inlet 830 than the respective extremity in a longitudinal direction Z. Further, respective extremity may have different distance (not shown in the drawing) to the air inlet in the longitudinal direction Z, as a result, the opposing air flows from the two air guiding elements will be blown out at different heights, so as to prevent interference.

[0176] The air guiding element may also be used on the top portion, and the extremity of the air guiding element on the top portion can also have different distance to the air inlet comparing with the other air guiding element such that each of the multiple air guiding elements will not disturb the other air guiding elements.

[0177] The air guiding element(s) 851, 852 may each comprise a duct to guide an air flow to output at the extremity 858 and 859 towards the air inlet 830.

[0178] The skilled person will appreciate that the proposed air guiding element(s) may be incorporated into any form of hair treatment apparatus herein described.

[0179] In some examples, each air guiding element may function as a hair engagement element. The air guiding elements, by virtue of their shape and positioning, may come into

[0180] 20 2024PF00649contact with the user's hair during operation of the hair treatment apparatus. In some examples, each air guiding element may function to bias the orientation of the hair treatment apparatus. As the hair treatment apparatus is moved through the user's hair, the interaction between the air guiding elements and the hair may create a force that tends to rotate or orient the apparatus in a particular direction. This biasing effect may help maintain the desired orientation of the asymmetric air flow pattern relative to the hair, even as the user manipulates the device.

[0181] In some examples, the lower portion 812 may be reconfigured to (instead of blocking an air flow) direct an output air flow, albeit at an angle to air flow emitted by the upper portion 811. This configuration may allow for more versatile air flow control and hair styling options.

[0182] By way of example, the lower portion 812 may be redesigned to perform a similar function to the lower portion 512 (Figure 5). Thus, such a bottom portion may surround a bottom part of the air inlet and be arranged to output downwards a second air flow away from the air inlet. This downward direction helps to smooth and straighten hair as it falls naturally, potentially reducing frizz and flyaways.

[0183] In some examples, the two side portions of the upper portion 811 are omitted. Thus, the upper portion 811 may comprise only the top portion 813. By omitting the side portions, the air flow is primarily directed from the top and bottom of the device, which can be particularly beneficial for certain hair styling techniques or hair types.

[0184] Of course, if the side portions are omitted, then the corresponding air guiding elements for the side portions may be similarly omitted.

[0185] The present disclosure also proposes a hair treatment device comprising any herein proposed hair treatment apparatus and the handle (portion) to which the hair treatment apparatus is connected.

[0186] In some examples, the connection may be detachable, allowing for interchangeable attachments. This may involve a snap-fit mechanism, magnetic coupling, or threaded connection.

[0187] Alternatively, the hair treatment apparatus may be fixedly attached to the handle, forming an integrated unit (i.e., an integrated hair treatment device). This may be readily achieved, for instance, by simply forming the components together during manufacturing.

[0188] The hair treatment device, e.g., the handle (portion), may house or comprise additional components such as a power source, controls, or an air flow generator. In some examples, the handle may include a rotational joint or flexible coupling to allow (further) adjustment of the hair treatment apparatus's orientation relative to the handle.

[0189] 21 2024PF00649It will be appreciated that any resulting hair treatment device, combining the proposed hair treatment apparatus with a handle (portion), represents a proposed embodiment of the invention.

[0190] The handle portion may comprise or take the shape of a conventional hair care apparatus, such as a hair dryer. Accordingly, the handle portion may comprise a traditional barrel shape with a narrow nozzle end that connects to or supports the rotational attachment of the hair treatment apparatus. This design allows for seamless integration of the proposed hair treatment device asymmetric air flow system with the familiar form and function of a standard hair dryer. The handle portion may also include internal components typical of hair dryers, such as a motor, heating elements, and electrical circuitry, which work in conjunction with the specialized air outlet system of the hair treatment apparatus.

[0191] Figures 9 and 10 illustrate an example of a proposed hair treatment device 900, comprising a hair treatment apparatus 910 (which may be embodied as any herein described hair treatment apparatus) and a handle portion 920.

[0192] More particularly, the hair treatment apparatus 910 comprising an air outlet system 911 for directing an air flow away from the hair treatment apparatus, wherein the air outlet system is configured to control the air flow to have asymmetric rotational symmetry about every axis originating at and extending away from the hair treatment apparatus. In the illustrated example, this manifests in the form of an air outlet window having rotational asymmetry.

[0193] In the illustrated example, the hair treatment apparatus 910 comprises a rotational attachment 915 for rotatably attaching the hair treatment apparatus to the handle portion 920. Moreover, the hair treatment apparatus is configured to, at least during use of the hair treatment apparatus, bias the orientation of the air outlet system to a predefined orientation with respect to gravity and / or the hair direction.

[0194] Figures 9 and 10 illustrates two different scenarios, which differ in that the handle has been rotated with respect to the hair treatment apparatus about a rotation axis Rl. As illustrated in Figures 9 and 10, the hair treatment apparatus has been designed to maintain the orientation of the air outlet system

[0195] In other examples, the handle portion may comprise or take a curved or cup-like shape for being held or carried in a palm. The hair treatment apparatus may be held within the cup-like shape of the handle, e.g., to be housed or supported by the handle, and the rotational attachment (if present) may be configured for facilitating rotation of the hair treatment apparatus within this handle.

[0196] 22 2024PF00649In yet other examples, the handle portion may take the form of an ergonomic grip designed to comfortably fit in a user's hand. This grip may incorporate contoured surfaces, non-slip materials, or adjustable elements to accommodate different hand sizes and grip preferences. The hair treatment apparatus may be mounted on or integrated into this ergonomic handle in a way that allows for easy manipulation and precise control during use.

[0197] In yet other examples, the handle portion may comprise a knob or protrusion extending from the rotational attachment to provide a secure grip point for the user.

[0198] Figure 11 illustrates another exemplary hair treatment device 1100 comprises a variant proposed hair treatment apparatus 1110.

[0199] The hair treatment apparatus 1110 here again comprises an air outlet system 1111, 1112 and an air inlet 1115 (which may be omitted in some variants). The hair treatment apparatus 1110 exhibits an alternative shape for elements of the hair treatment device, demonstrating that and the cross sectional shape of the apparatus and its elements may be any shape including rectangular, square, circular, semicircular and so on.

[0200] The illustrated hair treatment apparatus 1110 here also comprises a set of air guiding elements 1114, 1115 for guiding air emitted by the air outlet system (e.g., through one or more air outlets not visible in Figure 11) to the air inlet.

[0201] Variations to the disclosed embodiments can be understood and effected by those skilled in the art in practicing the claimed invention, from a study of the drawings, the disclosure and the appended claims. In the claims, the word "comprising" does not exclude other elements or steps, and the indefinite article "a" or "an" does not exclude a plurality.

[0202] The mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

[0203] If the term "adapted to" is used in the claims or description, it is noted the term "adapted to" is intended to be equivalent to the term "configured to". If the term "arrangement" is used in the claims or description, it is noted the term "arrangement" is intended to be equivalent to the term "system", and vice versa.

[0204] Any reference signs in the claims should not be construed as limiting the scope.

[0205] 23 2024PF00649

Claims

CLAIMS:

1. A hair treatment apparatus (100, 300, 400, 500, 800, 910, 1110) for interacting with hair extending in a hair direction, the hair treatment apparatus comprising:an air outlet system (110, 310, 410, 510, 710, 810, 911, 1111) for directing an air flow away from the hair treatment apparatus in one or more output air flow directions; and an air inlet (130, 830, 1115) for drawing air into the hair treatment apparatus, wherein the air outlet system is positioned around the air inlet,wherein the air outlet system is configured to control the air flow to have asymmetric rotational symmetry about every axis that both originates at the hair treatment apparatus and extends parallel to any output air flow direction.

2. The hair treatment apparatus of claim 1, wherein the air outlet system comprises:an upper portion (111, 311, 411, 511, 811) configured to direct air flow from the upper portion in one or more first output air flow directions away from the hair treatment apparatus; anda lower portion (112, 312, 412, 512, 812) configured to prevent air flow from being directed from the lower portion in any direction that makes less than a predetermined non-zero angle with respect to any first output air flow direction.

3. The hair treatment apparatus of claim 1 or 2, wherein the air outlet system is configured to guide at least some of the air flow from the air outlet system towards the air inlet.

4. The hair treatment apparatus of any one of claims 1 to 3, wherein the air outlet system surrounds the air inlet.

5. The hair treatment apparatus of any one of claims 1 to 4, wherein the air outlet system comprises:a top portion (313 A, 711, 813) surrounding a top part of the air inlet configured to output a first air flow in one or more first output air flow directions towards a user or inwardly towards the air inlet; and24 2024PF00649a bottom portion (712) surrounding a bottom part of the air inlet, wherein the bottom portion is arranged to output downwards a second air flow away from the air inlet.

6. The hair treatment apparatus of any one of claims 1 to 5, wherein the air outlet system takes an annular shape and a cross-sectional shape of the air flow directed by the air outlet system is a segment of the annular shape.

7. The hair treatment apparatus of any one of claims 1 to 6, further comprising a rotational attachment (120, 820, 915) for rotatably attaching the hair treatment apparatus to a handle portion (195, 920),wherein the hair treatment apparatus is configured to, at least during use of the hair treatment apparatus, bias the orientation of the air outlet system to a predefined orientation with respect to gravity and / or the hair direction.

8. The hair treatment apparatus of any one of claims 1 to 7, when dependent upon claim 2, wherein the hair treatment apparatus is configured to, at least during use of the hair treatment apparatus, bias the lower portion towards a lowermost position of the hair treatment apparatus with respect to gravity and / or the hair direction.

9. The hair treatment apparatus of any one of claims 7 or 8, wherein the hair treatment apparatus is weighted such that a gravitational force biases the orientation of the air outlet system to the predefined orientation with respect to gravity and / or the hair direction.

10. The hair treatment apparatus of any one of claims 7 to 9, wherein the hair treatment apparatus comprises an actuator system configured to actively control a rotation of at the air outlet system, with respect to the handle portion, to bias the orientation of the air outlet system to the predefined orientation with respect to gravity and / or the hair direction.

11. The hair treatment apparatus of any one of claims 7 to 10, further comprising a hair engagement element for contacting the hair, wherein the hair engagement element is configured such that movement of the hair treatment apparatus in the hair direction, when the hair engagement element contacts the hair, biases the orientation of the air outlet system to the predefined orientation with respect to gravity and / or the hair direction.25 2024PF0064912. The hair treatment apparatus of any one of claims 7 to 11, wherein the rotational attachment comprises a pivot or bearing for connecting the hair treatment apparatus to the handle portion.

13. The hair treatment apparatus of any one of claims 7 to 12, wherein the rotational attachment is configured to permit rotation of the hair treatment apparatus, with respect to the handle portion, in at least two separate planes.

14. The hair treatment apparatus of any one of claims 1 to 13, further comprising one or more air guiding elements (851, 852, 1114, 1115) that extend away from the air outlet system, each air guiding element being configured to guide air flow output by the air outlet system towards the air inlet.

15. A hair treatment device comprising the hair treatment apparatus of any one of claims 1 to 14 and a handle for being held or gripped by a user.26 2024PF00649

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