An aerosol generator equipped with a chamber for receiving aerosol-generating articles

Abstract

An aerosol generating device (100) for use with an aerosol-generating article includes a chamber (121) for removably receiving at least a portion of the aerosol-generating article. Along a central axis (122) of the chamber (121), an inner surface (130) of the chamber (121) includes a first axial portion (131) and a second axial portion (132), the first axial portion (131) being closer to the proximal end (124) of the chamber (121) than the second axial portion (132). The second axial portion (132) is dimpled, including a plurality of indentations (142), which extend outward from a reference surface area of ​​the second axial portion (142) in a direction away from the central axis (122). The first axial portion (131) includes a plurality of first protrusions (141), which are configured to contact at least a portion of the aerosol-generating article when the article is received in the chamber (121), and the plurality of first protrusions (141) extend from a reference surface area of ​​the first axial portion (131) beyond a reference surface area of ​​the second axial portion (132) in a direction toward the central axis (122).

Description

Technical Field

[0001] The present invention relates to an aerosol generating device for use with an aerosol generating article that generates an inhalable aerosol by heating an aerosol forming substrate contained within an article. The present invention further relates to an aerosol generating system that includes such a device and such an article.

Background Art

[0002] Aerosol generating devices for generating inhalable aerosols by heating an aerosol-forming substrate are generally well-known from the prior art. Such devices may comprise a heating element, in particular a resistive or inductive heating element for heating the aerosol-forming substrate within the device. The substrate itself may be an integral part of the aerosol-generating article, which may be at least partially received within a chamber of the device. The chamber may be dimensioned to provide a relatively tight fit to the aerosol-generating article in order to hold the article within the chamber during use of the device. However, a tight fit may result in unwanted heat loss due to direct heat conduction from the aerosol-generating article to the inner surface of the chamber. Further, when the article is tightly received within the chamber, condensate formation within the chamber may cause unwanted wetting of the article, in particular the substrate contained therein. Such condensate formation may occur when the vaporized compounds of the aerosol-forming substrate come into contact with those portions of the chamber walls and are cooled at a temperature below the dew point. Further, a tight fit may restrict the airflow through the chamber, which may in turn affect the airflow management of the device and cause a high draw resistance (RTD). This is particularly applicable to devices where the airflow path extends along the inner surface of the chamber, for example, between the inner surface of the chamber and the outer surface of the aerosol-generating received within the chamber. Also, a tight fit may cause damage or even breakage of the aerosol-generating article when inserted into or extracted from the chamber. This may result in debris within the chamber. Debris within the chamber may adversely affect the subsequent inhalation experience with another aerosol-generating article. The debris within the chamber preferably needs to be removed or cleaned, which causes further inconvenience to the user.

[0003] On the other hand, in order to prevent the article from being displaced or even falling out of the device during use, a sufficiently tight fit is required. This is even more applicable since many aerosol-forming substrates tend to shrink during use, thereby reducing the retention of the article within the chamber.

[0004] Accordingly, it is desirable to have an aerosol generating device and an aerosol generating system that have the advantages of prior art solutions while reducing their limitations. In particular, there is a need for an aerosol generating device and a corresponding system that provide improved retention of aerosol generating articles within the chamber of the device, as well as improved airflow management through the chamber.

SUMMARY OF THE INVENTION

[0005] According to one aspect of the present invention, there is provided an aerosol generating device for use with an aerosol generating article. The aerosol generating device comprises a chamber. The chamber can be a chamber for removably receiving at least a portion of the aerosol generating article. Along a central axis of the chamber, the inner surface of the chamber can include a first axial portion. The inner surface of the chamber can include a second axial portion. The first axial portion can be closer to the proximal end of the chamber than the second axial portion. The second axial portion can be dimpled. The second axial portion can be dimpled and include a plurality of depressions. The plurality of depressions can extend outwardly from a reference plane region of the second axial portion. The plurality of depressions can extend radially outwardly from the reference plane region of the second axial portion in a direction away from the central axis. The first axial portion can include a plurality of first protrusions. The plurality of first protrusions can be configured to contact at least a portion of the aerosol generating article received within the chamber. The plurality of first protrusions can extend from a reference plane region of the first axial portion. The plurality of first protrusions can extend from the reference plane region of the first axial portion in a direction towards the central axis beyond the reference plane region of the second axial portion.

[0006] According to one aspect of the present invention, there is provided an aerosol generating device for use with an aerosol generating article. The aerosol generating device comprises a chamber for removably receiving at least a portion of the aerosol generating article. Along a central axis of the chamber, an inner surface of the chamber includes a first axial portion and a second axial portion, the first axial portion being closer to a proximal end of the chamber than the second axial portion. The second axial portion is dimpled with a plurality of depressions, the plurality of depressions extending outwardly, particularly radially outwardly, away from the central axis from a reference plane region of the second axial portion. The first axial portion includes a plurality of first protrusions configured to contact at least a portion of the aerosol generating article received within the chamber, the plurality of first protrusions extending from a reference plane region of the first axial portion in a direction towards the central axis beyond a reference plane region of the second axial portion.

[0007] Furthermore, the inner surface of the chamber may include a third axial portion along the central axis of the chamber. The third axial portion is closer to a distal end of the chamber than the second axial portion. The third axial portion includes a plurality of second protrusions configured to contact at least a portion of the aerosol generating article received within the chamber. The plurality of second protrusions extend from a reference plane region of the third axial portion in a direction towards the central axis beyond a reference plane region of the second axial portion. As will be explained in more detail below, particularly when the article comprises two elements and a base element is disposed between two support elements, the third axial portion may be provided.

[0008] Since the plurality of first protrusions and optionally the plurality of second protrusions extend in a direction towards the central axis beyond the reference plane region of the second axial portion, the aerosol-generating article does not physically contact the second axial portion when received within the chamber. Thus, any direct heat conduction from the aerosol-generating article to the second axial portion is avoided. Advantageously, this results in a reduction of unwanted heat loss and thus an improvement in heating efficiency. Further, there is no direct physical contact between the second axial portion and those portions of the article that directly face the second axial portion when the article is received within the chamber, so wetting of the article due to condensation is avoided at least in these portions.

[0009] Furthermore, it will be appreciated that the aerosol-generating article only contacts the first protrusions of the first axial portion and, if present, the second protrusions of the third axial portion. Thus, the contact surface between the article and the chamber is reduced compared to a chamber without protrusions. Thus, the conductive heat exchange between the aerosol-generating article and the surrounding chamber and the wetting of the article are further reduced. The plurality of first protrusions and optionally the plurality of second protrusions preferably include contact surfaces for contacting the aerosol-generating article. The shape of the contact surfaces is adapted to the shape of the respective portions of the aerosol-generating article that each contact surface contacts when the article is inserted into the chamber. The contact surfaces may be curved or rounded so that the aerosol-generating article is not damaged.

[0010] Furthermore, the reduction of the contact surface area between the article and the chamber facilitates the insertion and removal of the article as it reduces the frictional force to be overcome when moving the article into or out of the chamber.

[0011] Although not physically in contact with the second axial portion, the aerosol-generating article is still firmly held within the chamber by the first protrusion of the first axial portion. If a third axial portion is present, the aerosol-generating article is held even more securely. In particular, due to the local nature of the contact between the aerosol-generating article and the first protrusion and any optional second protrusion, the holding pressure between the article and the protrusion is locally enhanced such that the protrusion can form a locally enlarged recess within the aerosol-generating article. Advantageously, the local recess allows for compensating for the potential shrinkage of the article during use. Thus, the risk of the article being displaced or falling out of the aerosol-generating device is advantageously reduced.

[0012] The plurality of first protrusions and any optional plurality of second protrusions are spaced apart from each other such that an air flow passage is formed along the inner surface between adjacent first protrusions and adjacent second protrusions.

[0013] With respect to this air flow passage along the inner surface, the dimpled second axial portion, in particular a plurality of indentations, causes the air flow to become turbulent along the second axial portion. The effect of the dimpled second axial portion is the same effect as that used to improve the aerodynamic behavior of a golf ball. The plurality of indentations in the second axial portion generates a turbulent boundary layer of air that adheres to the inner surface of the chamber. Compared to conventional aerosol-generating systems, the turbulent air flow serves to provide improved aerosol characteristics, such as a better flavor profile, a better nicotine delivery profile over time, etc. Further, the turbulent air flow advantageously ensures sufficient heat exchange between the air flowing around the article.

[0014] Similarly, the plurality of first protrusions and any optional plurality of second protrusions generate a multi-dimensional matrix of extensive air flow channels that also promote turbulent air flow.

[0015] Preferably, there is an air flow passage extending along the inner surface of the chamber from the proximal end of the chamber toward the distal end of the chamber. For this air flow passage, the first axial portion is upstream of the second axial portion. Similarly, an optional third axial portion is downstream of the second axial portion with respect to this air flow passage.

[0016] Generally, the first axial portion and the optional third axial portion may be regarded as surfaces including peaks and valleys, where the peaks have the shortest distance to or are closest to the central axis, or correspond to regions of the first protrusion and the second protrusion, and the valleys include a reference plane region and have the largest distance to or are farthest from the central axis, or correspond to regions between adjacent protrusions that are farthest from the central axis. The first protrusion and the optional second protrusion are each part of the first axial portion and the optional third axial portion, and thus are part of the inner surface of the chamber.

[0017] Similarly, the second axial portion can be regarded as a plane corresponding to the reference plane region and a surface including a plurality of dimples on that plane. The depressions are part of the second axial portion and thus are also part of the inner surface of the chamber.

[0018] Generally, the shape and distance of the plurality of depressions can be selected to ensure a turbulent air flow along the second axial portion.

[0019] At least one of the plurality of depressions, in particular each of the plurality of depressions, preferably has a conical shape, or a frustum of a cone shape, or a pyramid shape, or a pin-pull shape, or a frustum of a pyramid cone shape, or a dome shape, or a cube shape, or a partial spherical shape, or a cylindrical shape, or a triangular prism shape, or a polyhedral shape. Any of these shapes is suitable for ensuring a turbulent air flow along the second axial portion.

[0020] In particular, the depression may be a substantially dot-like depression. That is, the depression may be a substantially localized single depression, and the depth dimension of the depression may be of the same order of magnitude as the width dimension of the depression that is perpendicular to the depth dimension of the depression. In some embodiments, the depressions may be interconnected. In some embodiments, the depressions may not be interconnected.

[0021] At least one opening region of the plurality of depressions, in particular, the opening region of each of the plurality of depressions, may have a circular shape, or an oval shape, or an elliptical shape, or a rectangular shape, or a quadric shape, or a rhombic shape, or a parallelogram shape, or a triangular shape, or a hexagonal shape, or a polygonal shape. Here, the opening region refers to the base of each of the above-described shapes. For example, in the case of a pyramid shape or a pimple shape, the opening region corresponds to the base of the pyramid.

[0022] The formation of turbulent airflow along the inner surface can be significantly affected by the depth dimension of the depression. At least one of the plurality of depressions, in particular, each of the plurality of depressions, preferably has a depth dimension in the range of 0.25 millimeters to 2 millimeters, particularly in the range of 0.5 millimeters to 1 millimeter, in a direction perpendicular to the opening region of each respective depression. These values are particularly advantageous for improved airflow management through the device. It is preferable that all the depressions in the second axial portion have the same depth dimension.

[0023] The formation of turbulent airflow can also be affected by the density of the depressions. The density of a plurality of depressions can preferably be in the range of 0.1 to 1.0 depressions per square millimeter, preferably 0.2 to 0.7 depressions per square millimeter. These values have also been demonstrated to be advantageous for improved airflow management through the device. As used herein, the density per square millimeter refers to the envelope surface that touches each point of the reference plane area of the second axial portion. That is, the density per square millimeter refers to the area capacity of the protrusions of the second axial portion on the reference plane area in a direction perpendicular to the reference plane area, without referring to the actual surface area capacity of the "dimpled" second axial portion.

[0024] Similarly, the ratio of the reference plane area of the second axial portion to the envelope surface that touches each point of the reference plane area of the second axial portion can be in the range of 2 percent to 50 percent, particularly in the range of 10 percent to 40 percent.

[0025] The plurality of depressions are preferably arranged in a regular pattern. A regular pattern is particularly suitable for promoting turbulent airflow. Also, a regular pattern is easy to manufacture.

[0026] The reference plane area of the second axial portion may be a coherent area. That is, each section of the reference plane area is directly or indirectly connected to any other section of the reference plane area through one or more other sections of the reference plane area. In other words, the reference plane area does not have separated sections.

[0027] The reference plane area of the second axial portion preferably has a hexagonal grid pattern. A hexagonal grid pattern allows for a very compact arrangement of depressions, and thus a high density of a plurality of depressions. As another method, the reference plane area of the second axial portion may have a cross-intersecting grid pattern.

[0028] The number, shape, and distance of the plurality of first protrusions and optionally the plurality of second protrusions can be selected such that they contact a sufficient portion of the aerosol-generating article, in particular to securely hold the article within the chamber and, at the same time, to allow for a sufficient airflow along the inner surface of the chamber, in particular between the outer surface of the article and the inner surface of the chamber.

[0029] At least one of the plurality of first protrusions, in particular each of the plurality of first protrusions, preferably has a conical shape, or a frustum of a cone shape, or a pyramid shape, or a pimple shape, or a frustum of a pyramid shape, or a dome shape, or a cube shape, or a partial spherical shape, or a cylindrical shape, or a triangular prism shape, or a polyhedral shape. Similarly, at least one of the optional plurality of second protrusions, preferably each of them, may have a conical shape, or a frustum of a cone shape, or a pyramid shape, or a pimple shape, or a frustum of a pyramid shape, or a dome shape, or a cube shape, or a partial spherical shape, or a cylindrical shape, or a triangular prism shape, or a polyhedral shape. Any of these shapes has been demonstrated to be beneficial for generating a multi-dimensional matrix of extensive airflow channels for promoting turbulent airflow.

[0030] The first protrusions and the optional second protrusions can be substantially point-like protrusions, i.e., can be substantially localized in a single set, similar to any one of the aforementioned shapes. Advantageously, this results in a point-like contact between the protrusions and the aerosol-generating article. Point-like contact is particularly beneficial with respect to reducing wetting of the article and reducing heat transfer from the aerosol-generating article to the surrounding chamber. Additionally, point-like contact facilitates insertion and removal of the article because, for example, compared to linear contact with ribs or full contact with a smooth wall, the reduced contact surface area reduces the frictional force to be overcome when moving the article into or out of the chamber. Furthermore, the point-like shape of the first protrusions and the optional second protrusions is particularly useful for promoting turbulent airflow in the regions of the first axial portion and the optional third axial portion by means of the multi-dimensional matrix of extensive airflow channels formed between the first protrusions and the optional second protrusions.

[0031] Alternatively, the shapes of the plurality of first protrusions and optionally the plurality of second protrusions may be selected such that there is a linear contact between each protrusion and the aerosol generating article. In particular, at least one, preferably each, of the plurality of first protrusions may extend in a direction substantially along the central axis of the chamber. Similarly, at least one, preferably each, of the plurality of optional second protrusions may extend in a direction substantially along the central axis of the chamber.

[0032] The direction of extension substantially along the central axis may, in particular in the case of a substantially cylindrical chamber, be parallel to the central axis. Thus, at least one, preferably each, of the plurality of first protrusions may extend parallel to the central axis. Similarly, at least one, preferably each, of the plurality of optional second protrusions may extend parallel to the central axis.

[0033] The direction of extension of each protrusion substantially along the central axis may also be inclined with respect to the central axis (e.g., 2 degrees to 5 degrees), but still lies in a common plane with the central axis. The latter situation applies in particular to a substantially tapered chamber, such as a conical or frustoconical chamber. Thus, generally, at least one, preferably each, of the plurality of first protrusions may extend along each plane containing the central axis. Similarly, at least one, preferably each, of the plurality of optional second protrusions may extend along each plane containing the central axis.

[0034] Advantageously, the direction of extension of each protrusion substantially along the central axis facilitates the insertion and extraction of the aerosol generating article into and from the chamber. This is maintained in particular when the insertion direction corresponds to the direction of the central axis.

[0035] For example, at least one of the plurality of first protrusions, in particular each of them, may include a rib, or may be formed as a rib, or may be a rib. Similarly, at least one of the plurality of second protrusions, in particular each of the plurality of second protrusions, may include a rib, or may be formed as a rib, or may be a rib. One or more ribs preferably extend substantially along the direction of the central axis described above, that is, parallel to the central axis or in the general direction of the central axis. One or more ribs may have a substantially triangular cross-sectional shape. Alternatively, one or more ribs may have a substantially rectangular or substantially trapezoidal, or substantially semi-elliptical or substantially semi-circular cross-sectional shape.

[0036] At least one of the plurality of first protrusions, in particular each of them, and / or at least one of the plurality of second protrusions, in particular each of them, may be chamfered or may include at least one chamfer. Each protrusion may be chamfered on the side facing the insertion opening of the chamber, or preferably may include at least one chamfer facing the insertion opening of the chamber. Advantageously, this facilitates the insertion of the article into the chamber. Similarly, each protrusion may be chamfered on the side facing away from the insertion opening of the chamber, or may include at least one chamfer facing away from the insertion opening of the chamber. Advantageously, this facilitates the removal of the article from the chamber.

[0037] As viewed in the direction of the central axis, the plurality of first protrusions and the plurality of second protrusions may be arranged such that the position of each first protrusion coincides with the position of each second protrusion. In particular, the plurality of first protrusions and the plurality of second protrusions may be arranged such that each first protrusion overlaps each second protrusion as viewed in the direction of the central axis.

[0038] Generally, the plurality of first protrusions and optionally the plurality of second protrusions each include at least two first protrusions and second protrusions. In particular, the plurality of first protrusions and optionally the plurality of second protrusion portions can each include two, three, four, five, six, seven, eight, nine, ten, eleven, twelve or more first protrusions and second protrusions. If the inner surface of the chamber only includes a first axial portion and a second axial portion and does not include a third axial portion, it may be sufficient for the first axial portion to include three protrusions that can be uniformly distributed along the inner circumference of the chamber. Similarly, if the inner surface of the chamber also includes a third axial portion, each of the first axial portion and the third axial portion may include two protrusions located on opposite sides of each other, and the first protrusion of the first axial portion is offset by 90 degrees from the second protrusion of the third axial portion. Any of the above numbers provides a reasonable balance between sufficient holding of the article and sufficient reduction of the above-mentioned adverse effects. The numbers, in particular, apply to those protrusion shapes that provide a linear contact between the protrusions and the aerosol-generating article.

[0039] When the first protrusion and the optional third protrusion have one of the above-described dot-shaped protrusion shapes, the number of protrusions can be large. Therefore, at least one of the density of the plurality of first protrusions and the density of the optional plurality of second protrusions may be in the range of 0.25 to 1.5 protrusions per square millimeter, particularly in the range of 0.5 to 0.75 protrusions per square millimeter. Here, the density per square millimeter refers to the envelope surface that contacts each point of the reference surface area of each of the first axial portion and the optional third axial portion. That is, the respective densities per square millimeter refer to the respective protrusions of the first and third axial portions perpendicular to the respective reference surface areas, rather than the actual area capacity of the "non-uniform" first and third axial portions. The density of the plurality of first protrusions may be greater than, equal to, or less than the density of the optional plurality of second protrusions. Similarly, at least one of the density of the plurality of first protrusions and the density of the plurality of second protrusions may be greater than or less than the density of the plurality of depressions in the second axial portion.

[0040] The height dimensions of the first protrusion and optional second protrusions define the width of the air flow passage formed between the first protrusion and the optional second protrusions, in particular, between the outer surface of the article received in the chamber and the respective reference surface areas of the first axial portion and the optional third axial portion. At least one, preferably each, of the plurality of first protrusions may have a height dimension in the range of 0.5 millimeter to 2 millimeters, in particular in the range of 0.75 millimeter to 1.5 millimeters. Similarly, at least one, preferably each, of the plurality of second protrusions has a height dimension in the range of 0.5 millimeter to 2 millimeters, in particular in the range of 0.75 millimeter to 1.5 millimeters. These height values have been demonstrated to be particularly advantageous for promoting improved air flow management. Here, the height dimensions of the first protrusion and the optional second protrusions are defined as the distance between the peak of each protrusion and the adjacent portion of the respective reference surface area as viewed in the direction towards the central axis, preferably in a direction perpendicular to the central axis. Preferably, all of the first protrusions have the same height dimension. Similarly, if present, all of the second protrusions may have the same height dimension.

[0041] The plurality of first protrusions, or the optional plurality of second protrusions, or both the plurality of first protrusions and the optional plurality of second protrusions may be arranged in a regular pattern. The plurality of first protrusions and the optional plurality of second protrusions may each be uniformly distributed along the inner circumference of the chamber. In particular, the plurality of first protrusions and the optional plurality of second protrusions may each be uniformly spaced from each other by respective valleys (gaps) disposed between two adjacent protrusions. Advantageously, the regular pattern makes the holding of the aerosol-generating article uniform and thus particularly reliable.

[0042] Similar to the reference surface area of the second axial portion, each of the reference surface area of the first axial portion and the reference surface area of the optional third axial portion is a coherent area. The reference surface area of the first axial portion and the reference surface area of the optional third axial portion do not have separated sections.

[0043] Preferably, at least one of the reference plane regions of the first axial portion and the optional third axial portion has a cross-intersecting grid pattern. The cross-intersecting pattern of each reference plane region provides a linear air flow passage between the first protrusion and the second protrusion.

[0044] Alternatively, at least one of the reference plane regions of the first axial portion and the optional third axial portion may have a hexagonal grid pattern.

[0045] Advantageously, the number, shape, and distance of the plurality of first protrusions and the optional plurality of second protrusions can each be selected such that the withdrawal resistance (RTD) is within a desired range when the aerosol generating article is inserted into the chamber of the device. The withdrawal resistance can be in the range of 70 mmWG (millimeters of water column) to 120 mmWG (millimeters of water column). The withdrawal resistance (RTD) can preferably be 40 mmWG (millimeters of water column) to 70 mmWG (millimeters of water column), particularly 45 mmWG (millimeters of water column) to 65 mmWG (millimeters of water column), for example, 55 mmWG (millimeters of water column).

[0046] The chamber may have a substantially cylindrical shape. As used herein, the term "substantially cylindrical shape" refers to the shape of the chamber when protrusions and depressions are masked or not considered. That is, a substantially cylindrical rod shape refers to the shape of the chamber given by the respective reference plane regions of the first, second, and optional third axial portions. In the case of a substantially cylindrical chamber, a plurality of first protrusions and a plurality of optional second protrusions extend radially inwardly towards the central axis beyond the second axial portion. In particular, any distance between the inner surface and the central axis is measured in a direction radial to the central axis, i.e., a direction perpendicular to the central axis. The envelope surface intersecting the peak of each of the plurality of first protrusions preferably also has a substantially cylindrical shape. Similarly, the envelope surface intersecting the peak of each of the plurality of depressions may also have a substantially cylindrical shape. If present, the envelope surface intersecting the peak of each of the plurality of optional second protrusions also preferably has a substantially cylindrical shape.

[0047] Alternatively, the chamber may have a substantially tapered shape, particularly a substantially conical or frustoconical shape. As used herein, the term "substantially tapered shape, particularly a substantially conical or frustoconical shape" also refers to the shape of the chamber when masking protrusions and depressions, or when not considering protrusions and depressions, i.e., the shape of the chamber given by the reference plane regions of the first, second, and optional third axial portions respectively. For any of these shapes, any distance between the inner surface and the central axis is preferably measured perpendicular to the surface of the substantially tapered shape, particularly a substantially conical or frustoconical shape, i.e., perpendicular to the reference plane regions of the first, second, and optional third axial portions respectively. The envelope surface intersecting the peak of each of the plurality of first protrusions also preferably has a substantially tapered shape, particularly a substantially conical or frustoconical shape. Similarly, the envelope surface intersecting the peak of each of the plurality of depressions may also have a substantially tapered shape, particularly a substantially conical or frustoconical shape. If present, the envelope surface intersecting the peak of each of the optional plurality of second protrusions may also have a substantially tapered shape, particularly a substantially conical or frustoconical shape.

[0048] The chamber preferably has a substantially circular cross-section as viewed in a plane perpendicular to the central axis. In particular, the second axial portion may have a circular cross-section as viewed in a plane perpendicular to the central axis. Similarly, at least one of the first axial portion and the optional third axial portion may have a substantially circular cross-section as viewed in a plane perpendicular to the central axis without considering the first protrusion or the second protrusion respectively.

[0049] Alternatively, the chamber may also have a substantially elliptical cross-section, or a substantially oval cross-section, or a substantially square cross-section, or a substantially rectangular cross-section, or a substantially triangular cross-section, or a substantially polygonal cross-section. As used herein, the above cross-sectional shapes preferably refer to the cross-sectional shape of the chamber without considering any protrusions.

[0050] Similarly, the envelope curves around the central axes intersecting the peaks of each of the plurality of first protrusions or any plurality of second protrusions may each have one of a substantially circular, or a substantially elliptical shape, or a substantially oval shape, or a substantially square shape, or a substantially rectangular shape, or a substantially triangular shape, or a substantially polygonal shape. The shape of the envelope curve around the central axis intersecting the peak of each of the plurality of first protrusions or the plurality of second protrusions preferably corresponds to the cross-sectional shape of the aerosol generating article received in the chamber.

[0051] The chamber may include an insertion opening through which an aerosol generating article can be inserted into the chamber. As used herein, the direction in which the aerosol generating article is inserted is designated as the insertion direction. The insertion direction preferably corresponds to the extension of the central axis of the chamber. When inserted into the chamber, at least a portion of the aerosol generating article may still extend outwardly through the insertion opening. The portion extending outwardly is preferably provided for interaction with the user, especially for entering the user's mouth. Thus, during use of the device, the insertion opening may be close to the user's mouth. Thus, the insertion opening may be disposed at the proximal end of the aerosol generating device, particularly at the proximal end of the chamber.

[0052] Alternatively, the chamber may be accessible laterally with respect to the central axis. That is, the aerosol-generating article may be inserted into the chamber laterally with respect to the central axis. In addition to the lateral access, the chamber may further include an opening that may extend outwardly, particularly in a direction corresponding to the direction of the central axis of the chamber, when at least a portion of the aerosol-generating article is inserted through it into the chamber. As an example, the aerosol-generating device may comprise a lateral insertion opening that enables access to the chamber laterally with respect to the central axis. The device may further comprise a lid for covering the lateral insertion opening of the chamber. The lid may be removably attached to the body of the aerosol-generating device. In particular, the lid may be hinged, i.e., the lid may be attached to the body of the aerosol-generating device by a hinge. Similarly, the aerosol-generating device may comprise two housing parts each forming a part of the chamber. The two housing parts may be connected to each other by a hinge to enable the two housing parts to move between an open position and a closed position, and the interior of the chamber may be accessible in the open position.

[0053] Generally, the length of the first axial portion, the length of the second axial portion, and, if present, the length of any optional third axial portion may depend on the design of the aerosol-forming article received and held within the chamber. As will be described in more detail below, the article may include different elements. In particular, when the aerosol-generating article has a substantially rod shape, the article may include different elements arranged sequentially along the length axis of the article. Each portion of the inner surface of the chamber, i.e., the first axial portion, the second axial portion, and, if present, any optional third axial portion, may be assigned to a particular element of the aerosol-forming article.

[0054] The second axial portion may have a length of at least 20 percent of the total length of the inner surface or the chamber in the direction of the central axis. The second portion preferably has a length in the range of 20 percent to 40 percent, particularly 25 percent to 40 percent, and particularly 30 percent to 35 percent of the total length of the inner surface or the chamber. Advantageously, such a length provides a sufficient reduction of the above-mentioned adverse effects and further ensures that the air flow along the second axial portion becomes turbulent. The first axial portion, and optionally the third axial portion if present, may have equal lengths in the direction of the central axis. Alternatively, the first axial portion, and optionally the third axial portion, may have different lengths in the direction of the central axis.

[0055] The aerosol generating device may comprise one or more end stops disposed within the chamber, particularly at the distal end of the chamber. The one or more end stops are preferably configured to limit the insertion depth of the aerosol generating article into the chamber. In particular, the one or more end stops may be configured to prevent the aerosol generating article from abutting against the inner surface of the chamber at the distal end of the chamber, which is opposite to the insertion opening of the chamber at the proximal end of the chamber. Thus, the one or more end stops advantageously provide a free space within the distal portion of the chamber, which allows for a free air flow between the distal end of the chamber and the distal end of the aerosol generating article when the article is received within the chamber. The one or more end stops may include a contact surface against which the aerosol generating article, particularly the distal end of the aerosol generating article, may abut when the article is received within the chamber.

[0056] The aerosol generating device preferably may comprise a plurality of separate end stops, for example, three end stops disposed within the chamber, particularly at the distal end of the chamber.

[0057] The plurality of end stops may be arranged symmetrically around the central axis. In particular, the plurality of end stops may be arranged at equal intervals around the central axis. As described above, this allows for a free air flow around the end stops and the articles received within the chamber.

[0058] One or more of the end stops preferably have a dimension in the range of 0.5 millimeters to 5 millimeters, particularly in the range of 1 millimeter to 4 millimeters, preferably in the range of 1 millimeter to 2 millimeters, for example 1.4 millimeters, in the direction of the central axis.

[0059] One or more of the end stops preferably have a shape and dimensions such that they extend in a direction towards the central axis beyond the plurality of first protrusions and the plurality of second protrusions. One or more of the end stops preferably have a radial extension perpendicular to the central axis in the range of 0.7 millimeters to 6 millimeters, particularly in the range of 1 millimeter to 5 millimeters, preferably in the range of 2 millimeters to 4 millimeters.

[0060] One or more of the end stops may preferably have the shape of a ring segment, particularly when the chamber has a substantially cylindrical shape. The ring segment may have a height dimension in the direction of the central axis and a radial dimension perpendicular to the central axis. As described above, the height dimension of the ring segment may be in the range of 0.5 millimeters to 5 millimeters, particularly in the range of 1 millimeter to 4 millimeters, preferably in the range of 1 millimeter to 2 millimeters. The radial dimension of the ring segment may be in the range of 0.7 millimeters to 6 millimeters, particularly in the range of 1 millimeter to 5 millimeters, preferably in the range of 1 millimeter to 3 millimeters, for example 1.3 millimeters.

[0061] As an example, the chamber may be formed as an elongated cavity including the bottom at the distal end of the chamber. In this configuration, one or more of the end stops may be disposed within the chamber so as to protrude from the bottom of the distal end in a direction towards the proximal end of the chamber, particularly in a direction opposite to the direction of insertion of the article.

[0062] The reference plane regions of the first axial portion and the reference plane regions of the second axial portion may be arranged on a common shell surface, in particular on a common cylindrical, conical or frustoconical shell surface. The reference plane regions of the first axial portion and the reference plane regions of any optional third axial portion may be arranged on a common shell surface, in particular on a common cylindrical, conical or frustoconical shell surface. The reference plane regions of the second axial portion and the reference plane regions of any optional third axial portion may be arranged on a common shell surface, in particular on a common cylindrical, conical or frustoconical shell surface. The reference plane regions of the first axial portion, the reference plane regions of the second axial portion, and the reference plane regions of any optional third axial portion may be arranged on a common shell surface, in particular on a common cylindrical, conical or frustoconical shell surface.

[0063] The chamber may be a multi-part component. In particular, the chamber may include a first part and a second part, and the second part is preferably inserted into the first part. The second part may be formed as a sleeve. The second part may be attached to the first part in a form-fit or positive-fit manner. Alternatively or additionally, the second part may be attached to the first part via a friction fit or snap fit. The second part, if present, includes any optional third axial portion, while the first part preferably includes a second axial portion and a first axial portion. Such a configuration facilitates manufacture, in particular manufacture by injection molding.

[0064] The chamber may be formed as a chamber module, in particular as a tubular sleeve that can be inserted into the body of an aerosol generating device. Advantageously, this enables modular assembly of the aerosol generating device.

[0065] As another method, at least a part of the chamber may be integrally formed with the body. By providing at least a part of the chamber as part of the body, the number of parts used for the aerosol generating device can be reduced.

[0066] The aerosol generating device may further comprise a heating device for heating an aerosol-forming substrate in an aerosol-generating article received within a chamber of the device. The heating device may be an induction heating device. The induction heating device may comprise an induction source including an inductor configured to generate an alternating magnetic field, particularly a high-frequency magnetic field, within the chamber. The alternating magnetic field, particularly the high-frequency magnetic field, may be in the range of 500 kHz (kilohertz) to 30 MHz (megahertz), particularly 5 MHz (megahertz) to 15 MHz (megahertz), preferably 5 MHz (megahertz) to 10 MHz (megahertz). When an article is inserted into the chamber, the alternating magnetic field is used to inductively heat a susceptor that is in thermal contact or in thermal proximity to the aerosol-forming substrate to be heated. The inductor may be disposed so as to surround at least a portion of the chamber or at least a portion of the inner surface of the chamber, respectively. The inductor may be an inductor coil disposed within a side wall of the chamber, for example, a helical coil. Preferably, the inductor may be disposed so as to surround at least a second axial portion of the inner surface. More preferably, the inductor may be disposed so as to surround only a second portion of the inner surface. Alternatively, the inductor may be disposed so as to additionally at least partially surround a first axial portion or a third axial portion, or both a first axial portion and a third axial portion.

[0067] Alternatively, the heating device may be a resistive heating device including a resistive heating element. The resistive heating element is configured to heat when an electric current passes through it due to the ohmic resistance or resistive load inherent in the resistive heating element. For example, the resistive heating element may comprise at least one of a resistive heating wire, a resistive heating track, a resistive heating grid, or a resistive heating mesh. During use of the device, the resistive heating element is in thermal contact with or in thermal proximity to the aerosol-forming substrate to be heated.

[0068] The aerosol generating device may further comprise a controller configured to control the operation of the device. In particular, in order to control the heating of the aerosol-forming substrate to a predetermined operating temperature, the controller may preferably be configured to control the heating device in a closed-loop configuration. The operating temperature used for heating the aerosol-forming substrate may be at least 180 °C, in particular at least 300 °C, preferably at least 350 °C, more preferably at least 370 °C, and most preferably at least 400 °C.

[0069] The aerosol generating device may comprise a power source, in particular a DC power source configured to provide a DC supply voltage and a DC supply current for an induction heating arrangement. The power source is preferably a battery such as a lithium iron phosphate battery. Alternatively, the power source may be another form of charge storage device such as a capacitor. The power source may require recharging, i.e., the power source may be rechargeable. The power source may have a capacity that allows for sufficient energy storage for one or more user experiences. For example, the power source may have a capacity sufficient to allow for continuous generation of aerosol over a period of about six minutes or a multiple of six minutes. In another embodiment, the power supply may have a capacity sufficient to allow for a predetermined number of smoking sessions or discontinuous activation of the heating device.

[0070] The aerosol generating device may comprise a body preferably containing at least one of the controller and the power source. Further, the aerosol generating device may comprise a chamber module received within a recess of the body or attached to the body of the device. The chamber module includes the chamber of the device according to the present invention and as described herein.

[0071] The chamber module can be an independent subject matter of the present invention. Thus, the present invention further relates to a chamber module for use in an aerosol generating device, the chamber module including a chamber for removably receiving at least a portion of an aerosol generating article. Along a central axis of the chamber, an inner surface of the chamber includes a first axial portion and a second axial portion. The first axial portion is closer to a proximal end of the chamber than the second axial portion. The second axial portion is dimpled and includes a plurality of depressions. The plurality of depressions extend outwardly from a reference plane region of the second axial portion. The plurality of depressions can extend radially outwardly from the reference plane region of the second axial portion in a direction away from the central axis. The first axial portion includes a plurality of first protrusions configured to contact at least a portion of an aerosol generating article received within the chamber. The plurality of first protrusions extend from a reference plane region of the first axial portion. The plurality of first protrusions can extend from the reference plane region of the first axial portion in a direction toward the central axis beyond a reference plane region of the second axial portion.

[0072] The chamber module can be configured to be received within a cavity of a body of the aerosol generating device or to be attachable to the body of the device.

[0073] Further features of the chamber module, particularly of the chamber, have already been described above with respect to the aerosol generating device and are equally applicable.

[0074] The present invention further relates to an aerosol generating system including an aerosol generating device as provided by the present invention and as described herein. The system further comprises an aerosol generating article including at least one aerosol-forming substrate heated by the device, at least a portion of the article being removably receivable or removably received within the chamber of the device.

[0075] The device and the article are configured such that when the article is inserted into the chamber, a plurality of first protrusions and, if present, a plurality of second protrusions contact at least a portion of the aerosol-generating article so as to hold the aerosol-generating article within the chamber. In contrast, a second portion of the inner surface of the chamber is not in contact with the aerosol-generating article.

[0076] The shape of the envelope curve around the central axis intersecting the peaks of each of the plurality of first protrusions or, optionally, the plurality of second protrusions preferably corresponds to the cross-sectional shape of the aerosol-generating article received in the chamber, respectively.

[0077] As described above with respect to the aerosol-generating device according to the present invention, the plurality of first protrusions and, optionally, the plurality of second protrusions are spaced apart from each other such that air flow passages are formed between adjacent first protrusions and, if present, between the second protrusions. Advantageously, the shape and the distance of the plurality of first protrusions and, optionally, the plurality of second protrusions can each be selected such that when the aerosol-generating article is inserted into the chamber of the device, the withdrawal resistance (RTD) is within a desired range. The withdrawal resistance can be in the range of 70 mmWG (millimeters of water column) to 120 mmWG (millimeters of water column). The withdrawal resistance (RTD) can preferably be 40 mmWG (millimeters of water column) to 70 mmWG (millimeters of water column), particularly 45 mmWG (millimeters of water column) to 65 mmWG (millimeters of water column), for example, 55 mmWG (millimeters of water column).

[0078] As an example, the aerosol-generating article may comprise the following elements: a substrate element, a support element, a cooling element, and a filter element. All of the aforementioned elements may be sequentially arranged along the length axis of the article in the order described above, with the substrate element being disposed at the distal end of the article and the filter element being disposed at the proximal end of the article. In particular, the substrate element is located downstream of the support element with respect to the airflow passing through the article during use of the system. Each of the aforementioned elements may be substantially cylindrical. In particular, all of the elements may have the same outer cross-sectional shape. Additionally, the elements may be surrounded by an outer wrapper so as to hold the elements together and maintain the desired cross-sectional shape of the rod-shaped article. The wrapper is preferably made of paper.

[0079] The substrate element preferably includes at least one aerosol-forming substrate that is heated. When the aerosol generation system is based on inductive heating, the substrate element may further include a susceptor that is in thermal contact with or thermally proximate to the aerosol-forming substrate.

[0080] The support element may include a hollow cellulose acetate tube having an empty central air passage.

[0081] The aerosol cooling element may be an element having a large surface area and a low draw resistance (e.g., 15 mmWG (millimeters of water column) to 20 mmWG (millimeters of water column)). During use, the aerosol formed by the volatile compounds released from the substrate element is drawn through the aerosol cooling element before being conveyed towards the proximal end of the aerosol-generating article.

[0082] The filter element preferably functions as a mouthpiece or as part of a mouthpiece together with the aerosol cooling element. As used herein, the term "mouthpiece" refers to the part of the article through which the aerosol passes and exits the aerosol-generating article.

[0083] If the aerosol generating device is intended to be used with an aerosol generating article (only one support element) according to the specific embodiments described above, the chamber of the aerosol generating device preferably includes only a first axial portion and a second axial portion, and does not include a third axial portion. In this configuration, it is preferred that the device and the article are configured such that the support element is surrounded by the second axial portion without contacting the first axial portion and the base element contacting the second axial portion. However, the base element may at least partially contact the first axial portion. Therefore, the axial lengths of the first axial portion and the second axial portion, as well as the lengths of the support element and the base element of the article, can be dimensioned such that when the aerosol generating article is received in the chamber, at least most of the base element, particularly more than 50%, preferably all of the base element, is aligned with the second axial portion. As used herein, the term "in contact" is understood to mean that a part of the support element or the base element contacts the axial portion indirectly or directly, depending on whether the support element and the base element are surrounded by a wrapper.

[0084] The support element preferably may have a length along the length axis of the rod-shaped article corresponding to the length of the first axial portion along the central axis of the chamber. Similarly, the base element may have a length along the length axis of the rod-shaped article corresponding to the length of the second axial portion along the central axis of the chamber. Alternatively, the first axial portion may have a length greater than the length of the support element so as to at least partially contact the base element.

[0085] According to another embodiment, the aerosol-generating article may comprise the following elements: a distal support element, a substrate element, a proximal support element, a cooling element, and a filter element. All of the aforementioned elements may be sequentially arranged along the length axis of the article in the order described above, with the distal support element disposed at the distal end of the article and the filter element disposed at the proximal end of the article. That is, the substrate element is located between the proximal support element and the distal support element. In particular, the substrate element is located downstream of the proximal support element and upstream of the distal support element with respect to the airflow passing through the article during use of the system. Each of the aforementioned elements may be substantially cylindrical. In particular, all of the elements may have the same outer cross-sectional shape. Additionally, the elements may be surrounded by an outer wrapper so as to hold the elements together and maintain the desired cross-sectional shape of the rod-shaped article. The wrapper is preferably made of paper.

[0086] The substrate, the cooling element, and the filter element may correspond to their respective elements according to the aforementioned embodiments.

[0087] The distal support element and the proximal support element may include a hollow cellulose acetate tube having a central air passage. Alternatively, the distal support element may include a cellulose acetate plug (without a central air passage). The cellulose acetate plug may be used to cover and protect the distal front end of the substrate element.

[0088] If the aerosol generating device is intended to be used with an aerosol generating article (two support elements) according to the specific embodiments described above, the chamber of the aerosol generating device preferably includes a first axial portion, a second axial portion, and a third axial portion as described above. In this configuration, the device and the article are preferably configured such that the proximal support element contacts the first axial portion, the distal support element contacts the third axial portion, and the substrate element is surrounded by the second axial portion without contacting the second axial portion. However, the substrate element may at least partially contact at least one of the first axial portion or the third axial portion. Thus, the axial lengths of the first, second, and third axial portions, as well as the lengths of the proximal support element, the substrate element, and the distal support element of the article, may be dimensioned such that at least most of the substrate element, particularly more than 50%, preferably all of the substrate element, is aligned with the second axial portion when the aerosol generating article is received within the chamber.

[0089] The proximal support element preferably may have a length in a direction along the longitudinal axis of the rod-shaped article corresponding to the length of the first axial portion along the central axis of the chamber. Similarly, the distal support element may have a length in a direction along the longitudinal axis of the rod-shaped article corresponding to the length of the third axial portion along the central axis of the chamber. Thus, the substrate element may also have a length in a direction along the longitudinal axis of the rod-shaped article corresponding to the length of the second axial portion along the central axis of the chamber. Alternatively, at least one of the first axial portion and the second axial portion may have a length greater than the length of the proximal support element or the distal support element, respectively, so as to at least partially contact the substrate element.

[0090] Any of the foregoing configurations is advantageous for several reasons. First, the base element is spaced from the second axial portion via a gap and is thus less susceptible to the effects of condensate formation. Further, the first and optional second protrusions of the first and third axial portions advantageously engage those portions of the article that are the stiffest and tend to shrink the least during use. For this reason, the article is securely held within the chamber without risk of displacement or detachment from the device.

[0091] Further features and advantages of the aerosol generating system and aerosol generating article according to the present invention have already been described above with respect to the aerosol generating device and equally apply.

[0092] As used herein, the term "aerosol generating device" generally refers to an electrically operated device having the ability to interact with an aerosol-forming substrate provided within an aerosol generating article so as to generate an aerosol by heating the substrate. The aerosol generating device is preferably a smoking device for generating an aerosol that can be directly inhaled by a user through the user's mouth. In particular, the aerosol generating device is a handheld aerosol generating device.

[0093] As used herein, the term "aerosol-generating article" refers to an article comprising at least one aerosol-forming substrate that releases a volatile compound capable of forming an aerosol when heated. The aerosol-generating article is preferably a heated aerosol-generating article. That is, it is an aerosol-generating article comprising at least one aerosol-forming substrate that is intended to be heated, rather than combusted, to release a volatile compound capable of forming an aerosol. The aerosol-generating article may be a consumable, particularly a consumable that is discarded after single use. For example, the article may be a cartridge comprising a liquid aerosol-forming substrate that is heated. Alternatively, the article may be a rod-shaped article (particularly a tobacco article) that resembles a conventional cigarette. As described above, the article may further comprise a susceptor positioned in thermal proximity or thermal contact with the aerosol-forming substrate such that when the article is received within a cavity of the device, the susceptor can be inductively heated by an inductive heating arrangement during use.

[0094] As used herein, the term "susceptor" refers to an element having the ability to convert electromagnetic energy into heat when subjected to an alternating magnetic field. This can be the result of hysteresis losses and / or eddy currents induced within the susceptor, depending on the electrical and magnetic properties of the susceptor material. Hysteresis losses occur within ferromagnetic or ferrimagnetic susceptors due to magnetic domains within the material that are switched under the influence of an alternating electromagnetic field. Eddy currents may be induced if the susceptor is conductive. In the case of a conductive ferromagnetic or ferrimagnetic susceptor, heat can be generated by both eddy currents and hysteresis losses.

[0095] As used herein, the term "aerosol-forming substrate" means a substrate formed from, or containing, an aerosol-forming material capable of releasing a volatile compound upon heating to form an aerosol. The aerosol-forming substrate is intended to be heated, rather than combusted, to release the aerosol-forming volatile compound. The aerosol-forming substrate may be a solid aerosol-forming substrate, a liquid aerosol-forming substrate, a gel-like aerosol-forming substrate, or any combination thereof. That is, the aerosol-forming substrate may contain both solid and liquid components. The aerosol-forming substrate may include a tobacco-containing material containing a volatile tobacco flavor compound released from the substrate upon heating. Alternatively, or in addition, the aerosol-forming substrate may include a non-tobacco material. The aerosol-forming substrate may further include an aerosol-forming body. Examples of suitable aerosol-forming bodies are glycerin and propylene glycol. The aerosol-forming substrate may also include other additives and components such as nicotine or flavorants. The aerosol-forming substrate may also be a paste-like material, a sachet of a porous material containing the aerosol-forming substrate, or loose tobacco mixed with, for example, a gelling agent or an adhesive, which may include a common aerosol-forming body such as glycerin, which is compressed or formed into a plug.

[0096] As used herein, the term "aerosol-generating system" refers to a combination of an aerosol-generating article as further described herein and an aerosol-generating device according to the present invention as described herein. In the system, the article and the device cooperate to generate an aerosol suitable for inhalation.

[0097] As used herein, in the use of the device, the section that is close to the user's mouth, particularly, when present, the section close to the insertion opening of the chamber, is denoted with the prefix "proximal". The section that is disposed further away is denoted with the prefix "distal". Thus, the chamber may be disposed or positioned in the proximal part of the aerosol generating device. Similarly, when present, the insertion opening may be disposed or positioned at the proximal end of the aerosol generating device.

[0098] As used herein, the term "extending in a direction towards the central axis" means that a plurality of first protrusions and optionally a plurality of second protrusions extend into the interior of the chamber. Depending on the general shape of the chamber, the direction towards the central axis may particularly be at right angles to the central axis. In particular, "extending beyond the reference plane region of the second axial part of the inner surface in a direction towards the central axis" means that in the direction towards the central axis, each protrusion of the plurality of first protrusions and each protrusion of the optionally plurality of second protrusions extend beyond the corresponding part of the reference plane region of the second axial part having the same azimuthal position with respect to the central axis of the chamber. That is, at a given azimuthal position of each first or optionally second protrusion, the reference plane region of the second part recedes outwardly with respect to each first or optionally second protrusion as seen in the outward direction extending away from the central axis.

[0099] As used herein, the term "configured to contact at least a portion of the aerosol-generating article" means that when the aerosol-generating article is received within the chamber, at least a portion of the protrusions of the plurality of first protrusions, in particular at least 70%, preferably at least 80%, more preferably at least 90% of the plurality of first protrusions, are in contact with the aerosol-generating article. The same applies to any plurality of second protrusions. That is, the term "configured to contact at least a portion of the aerosol-generating article" means that when the aerosol-generating article is received within the chamber, at least a portion of the protrusions of the plurality of second protrusions, in particular at least 70%, preferably at least 80%, more preferably at least 90% of the plurality of second protrusions, are in contact with the aerosol-generating article.

[0100] As used herein, the term "reference surface area" of the first axial portion, the second axial portion, and any optional third axial portion refers to those areas of the first axial portion, the second axial portion, and any optional third axial portion that do not include depressions or protrusions. That is, the reference surface area refers to those areas of the first axial portion, the second axial portion, and any optional third axial portion that mask a plurality of depressions or protrusions or remain when a plurality of depressions or protrusions are not considered.

[0101] Non-limiting examples are provided below in a non-exhaustive manner. Any one or more features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.

[0102] Example 1: An aerosol generating device for use with an aerosol generating article, the aerosol generating device comprising a chamber for removably receiving at least a portion of the aerosol generating article, along a central axis of the chamber, an inner surface of the chamber includes a first axial portion and a second axial portion, the first axial portion being closer to a proximal end of the chamber than the second axial portion, the second axial portion being dimpled with a plurality of depressions, the plurality of depressions extending outwardly in a direction away from the central axis, particularly radially outwardly, from a reference plane region of the second axial portion, the first axial portion including a plurality of first protrusions, the plurality of first protrusions being configured to contact at least a portion of the aerosol generating article received within the chamber, the plurality of first protrusions extending in a direction from a reference plane region of the first axial portion toward the central axis beyond a reference plane region of the second axial portion, an aerosol generating device.

[0103] Example 2: Along a central axis of the chamber, an inner surface of the chamber includes a third axial portion, the third axial portion being closer to a distal end of the chamber than the second axial portion, the third axial portion including a plurality of second protrusions, the plurality of second protrusions being configured to contact at least a portion of the aerosol generating article received within the chamber, the plurality of second protrusions extending in a direction from a reference plane region of the third axial portion toward the central axis beyond a reference plane region of the second axial portion, the aerosol generating device according to Example 1.

[0104] Example 3: At least one of the plurality of depressions, particularly each of the plurality of depressions, has a conical shape, or a frustum of a cone shape, or a pyramid shape, or a pimple shape, or a frustum of a pyramid shape, or a dome shape, or a cube shape, or a partial spherical shape, or a cylindrical shape, or a triangular prism shape, or a polyhedron shape, the aerosol generating device according to any one of the preceding examples.

[0105] Example 4: An aerosol generator according to any of the preceding embodiments, wherein at least one of the plurality of recesses, in particular, the opening region of each of the plurality of recesses, has a circular shape, or an oval shape, or an elliptical shape, or a rectangular shape, or a quadric surface shape, or a rhombic shape, or a parallelogram shape, or a triangular shape, or a hexagonal shape, or a polygonal shape.

[0106] Example 5: An aerosol generator according to any one of the preceding embodiments, wherein the density of the plurality of recesses is in the range of 0.1 to 1.0 recesses per square millimeter, preferably 0.2 to 0.7 recesses per square millimeter.

[0107] Example 6: An aerosol generator according to any of the preceding embodiments, wherein at least one of the plurality of recesses has a depth dimension in the range of 0.25 millimeters to 2 millimeters, preferably 0.5 millimeters to 1 millimeter, in a direction perpendicular to the opening region of each recess.

[0108] Example 7: An aerosol generator according to any one of the preceding embodiments, wherein the plurality of recesses are arranged in a regular pattern.

[0109] Example 8: An aerosol generator according to any of the preceding embodiments, wherein the second axial portion is a coherent region.

[0110] Example 9: An aerosol generator according to any one of the preceding embodiments, wherein the reference plane region of the second axial portion has a hexagonal grid pattern.

[0111] Example 10: An aerosol generator according to any of the preceding embodiments, wherein the second axial portion has a cross-intersection grid pattern.

[0112] Example 11: The second axial portion has a length in the direction of the central axis that is at least 20 percent, particularly in the range of 20 percent to 40 percent, or 25 percent to 40 percent, or 30 percent to 35 percent of the total length of the inner surface or the chamber, according to any one of the preceding examples, of an aerosol generator.

[0113] Example 12: At least one, preferably each, of the plurality of first protrusions has a conical shape, or a frustoconical shape, or a pyramidal shape, or a pimple shape, or a frustopyramidal shape, or a dome shape, or a cubic shape, or a partial spherical shape, or a cylindrical shape, or a triangular prism shape, or a polyhedral shape, according to any one of the preceding examples, of an aerosol generator.

[0114] Example 13: At least one, preferably each, of any plurality of second protrusions has a conical shape, or a frustoconical shape, or a pyramidal shape, or a pimple shape, or a frustopyramidal shape, or a dome shape, or a cubic shape, or a partial spherical shape, or a cylindrical shape, or a triangular prism shape, or a polyhedral shape, according to any one of the preceding examples, of an aerosol generator.

[0115] Example 14: The first protrusion and any second protrusions can be substantially point-like protrusions, according to any one of the preceding examples, of an aerosol generator.

[0116] Example 15: At least one of the density of the plurality of first protrusions and the density of any plurality of second protrusions is in the range of 0.25 to 1.5 protrusions per square millimeter, particularly in the range of 0.5 to 0.75 protrusions per square millimeter, according to any one of the preceding examples, of an aerosol generator.

[0117] Example 16: An aerosol generating device according to any one of the preceding examples, wherein at least one, preferably each, of the plurality of first protrusions has a height dimension in the range of 0.5 millimeters to 2 millimeters, particularly in the range of 0.75 millimeters to 1.5 millimeters.

[0118] Example 17: An aerosol generating device according to any one of the preceding examples, wherein at least one, preferably each, of the plurality of second protrusions has a height dimension in the range of 0.5 millimeters to 2 millimeters, particularly in the range of 0.75 millimeters to 1.5 millimeters.

[0119] Example 18: An aerosol generating device according to any one of the preceding examples, wherein the plurality of first protrusions are arranged in a regular pattern.

[0120] Example 19: An aerosol generating device according to any one of the preceding examples, wherein the plurality of second protrusions are arranged in a regular pattern.

[0121] Example 20: An aerosol generating device according to any one of the preceding examples, wherein at least one of the reference plane regions of the first axial portion and the optional third axial portion is a coherent region.

[0122] Example 21: An aerosol generating device according to any one of the preceding examples, wherein at least one of the reference plane regions of the first axial portion and the optional third axial portion has a cross-intersecting grid pattern.

[0123] Example 22: An aerosol generating device according to any one of the preceding examples, wherein the chamber has a substantially cylindrical shape, or a substantially tapered shape, particularly a substantially conical shape or a substantially frustoconical shape.

[0124] Example 23: The aerosol generator according to any one of the preceding examples, wherein the chamber has a substantially circular cross-section, or a substantially elliptical cross-section, or a substantially oval cross-section, or a substantially square cross-section, or a substantially rectangular cross-section, or a substantially triangular cross-section, or a substantially polygonal cross-section, as seen in a plane perpendicular to the central axis.

[0125] Example 24: The aerosol generator according to any one of the preceding examples, wherein the chamber includes an insertion opening for inserting the aerosol-generating article into the chamber.

[0126] Example 25: The aerosol generator according to Example 24, wherein the insertion opening is located at the proximal end of the aerosol generator, particularly at the proximal end of the chamber.

[0127] Example 26: The aerosol generator according to any one of the preceding examples, wherein the device includes one or more end stops disposed within the chamber, particularly at the distal end of the chamber.

[0128] Example 27: The aerosol generator according to Example 26, wherein the plurality of end stops are disposed symmetrically around the central axis, particularly at equal intervals around the central axis.

[0129] Example 28: The aerosol generator according to any one of Examples 26 or 27, wherein one or more end stops have a dimension in the direction of the central axis in the range of 0.5 millimeters to 5 millimeters, particularly in the range of 1 millimeter to 4 millimeters, preferably in the range of 1 millimeter to 2 millimeters, for example 1.4 millimeters.

[0130] Example 29: The aerosol generator according to any one of Examples 26 to 28, wherein one or more end stops have a radial extension perpendicular to the central axis in the range of 0.7 millimeters to 6 millimeters, particularly in the range of 1 millimeter to 5 millimeters, preferably in the range of 2 millimeters to 4 millimeters.

[0131] Example 30: The aerosol generator according to any one of Examples 26 to 29, wherein one or more end stop portions have the shape of a ring segment.

[0132] Example 31: The aerosol generator according to any one of the preceding examples, wherein the reference plane regions of the first axial portion and the reference plane regions of the second axial portion are disposed on a common shell surface, in particular, on a common cylindrical, conical, or frustoconical shell surface.

[0133] Example 32: The aerosol generator according to any one of the preceding examples, wherein the reference plane regions of the first axial portion and the reference plane regions of any optional third axial portion are disposed on a common shell surface, in particular, on a common cylindrical, conical, or frustoconical shell surface.

[0134] Example 33: The aerosol generator according to any one of the preceding examples, wherein the reference plane regions of the second axial portion and the reference plane regions of any optional third axial portion are disposed on a common shell surface, in particular, on a common cylindrical, conical, or frustoconical shell surface.

[0135] Example 34: The aerosol generator according to any one of the preceding examples, wherein the reference plane regions of the first axial portion, the reference plane regions of the second axial portion, and the reference plane regions of any optional third axial portion are disposed on a common shell surface, in particular, on a common cylindrical, conical, or frustoconical shell surface.

[0136] Example 35: The device may comprise a body and a chamber module received within the cavity of the body or attached to the body, the chamber module being an aerosol generator according to any one of the preceding examples and including a chamber.

[0137] Example 36: A chamber module for use in an aerosol generating device, the chamber module including a chamber for removably receiving at least a portion of an aerosol generating article, along a central axis of the chamber, an inner surface of the chamber including a first axial portion and a second axial portion, the first axial portion being closer to a proximal end of the chamber than the second axial portion, the second axial portion being dimpled and including a plurality of depressions, the plurality of depressions extending outwardly, particularly radially outwardly, in a direction away from the central axis from a reference plane region of the second axial portion, the first axial portion including a plurality of first protrusions, the plurality of first protrusions being configured to contact at least a portion of an aerosol generating article received within the chamber, the plurality of first protrusions extending in a direction from a reference plane region of the first axial portion toward the central axis beyond a reference plane region of the second axial portion, the chamber module.

[0138] Example 37: The chamber module according to Example 36, wherein the chamber module is configured to be received within a cavity of a body of the aerosol generating device or to be attachable to the body of the aerosol generating device.

[0139] Example 38: An aerosol generating system comprising an aerosol generating device according to any one of the preceding examples and an aerosol generating article including an aerosol forming substrate, at least a portion of the aerosol generating article being removably receivable or removably receivable within a chamber of the aerosol generating device.

[0140] Example 39: The aerosol-generating article comprises at least a proximal support element, an optional distal support element, and a substrate element comprising an aerosol-forming substrate, the substrate element being located downstream of the proximal support element and upstream of the optional distal support element with respect to the airflow passing through the article during use of the system, and when the article is received within the chamber, the proximal support element contacts a first axial portion, the optional third axial portion contacts the optional distal support element, and the substrate element is surrounded by a second axial portion without contacting the second axial portion, an aerosol-generating system according to an example.

Brief Description of the Drawings

[0141] Here, the examples will be further described with reference to the drawings.

[0142]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Modes for Carrying Out the Invention

[0143] Figures 1 and 2 schematically illustrate an exemplary embodiment of an aerosol generating system 1 according to the present invention. The system 1 comprises an aerosol generating article 200 and an aerosol generating device 100, which are two main components for use with the article 200 to generate an inhalable aerosol by heating an aerosol forming substrate 222 contained within the article 200.

[0144] The aerosol generating device 100 has an elongated shape and includes a body 110 and a sleeve-shaped chamber module 120. The chamber module 120 includes a chamber 121 for receiving at least a portion of the aerosol generating article 200. The chamber module 120 is inserted into a cavity 111 formed within a proximal portion 112 of the body 110. Within the distal portion 113, the body 110 comprises a power source 150 and a controller 160 for supplying power to the device 100 and controlling its operation.

[0145] The article 200 has a rod shape similar to that of a conventional cigarette. In this embodiment, the article 200 comprises five elements arranged coaxially, namely a distal support element 210, a substrate element 220, a proximal support element 230, an aerosol cooling element 240, and a filter plug 250. The distal support element 210 is disposed at the distal end of the article 200. The substrate element 220 includes an aerosol forming substrate 222 to be heated. The aerosol forming substrate 222 may include, for example, a wound sheet of a homogenized tobacco material containing glycerin as an aerosol former. The proximal support element 230 includes a hollow core forming a central air passage 232. The filter plug 250 functions as a mouthpiece and may include, for example, cellulose acetate fibers. The five elements are substantially cylindrical elements arranged sequentially and continuously. The elements have substantially the same diameter and are surrounded by an outer wrapper 260 made of cigarette paper so as to form a cylindrical rod. The outer wrapper 260 may be wound around the aforementioned elements such that the free ends of the wrapper overlap each other. The wrapper may further include an adhesive for adhering the overlapping free ends of the wrapper to each other.

[0146] To heat the substrate 222 within the article 200, the aerosol generating device 100 according to the present invention comprises an induction heating device. The induction heating device comprises an induction coil 170 for generating an alternating magnetic field, particularly a high-frequency magnetic field, within the chamber 121. The high-frequency magnetic field may preferably be in the range of 500 kHz (kilohertz) to 30 MHz (megahertz), particularly 5 MHz (megahertz) to 15 MHz (megahertz), preferably 5 MHz (megahertz) to 10 MHz (megahertz). In the present embodiment, the induction coil 170 is a helical coil that circumferentially surrounds the cylindrical chamber module 120 along its longitudinal axis 122. The alternating magnetic field is used to inductively heat a susceptor 270 disposed within the aerosol-forming substrate 222 of the article 200 such that the article 200 experiences the magnetic field generated by the induction coil 170 when received within the chamber 121. In the present embodiment, the susceptor 270 is a susceptor blade disposed within the substrate element 220 along the longitudinal axis of the article 200 so as to physically and directly contact the aerosol-forming substrate 222.

[0147] Thus, when the induction heating device is activated, a high-frequency alternating current passes through the induction coil 170 and an alternating magnetic field is generated within the chamber 121. Depending on the magnetic and electrical properties of each susceptor material, the alternating magnetic field induces at least one of eddy currents or hysteresis losses within the susceptor 270. As a result, the susceptor 270 is heated until it reaches a temperature sufficient to form an aerosol from the substrate 222. The generated aerosol is drawn downstream through the aerosol-generating article 200 and may be inhaled by the user.

[0148] Figures 3 and 4 show further details of the chamber 121 defined by the chamber module 120 and the walls of the chamber module 120. The chamber module 120 is an elongated sleeve at the proximal end 101 of the device 100 and includes an insertion opening 126 through which the aerosol generating article 200 can be inserted into the chamber 121. The insertion direction of the aerosol generating article 200 extends substantially along the central axis 122 of the chamber 121. The chamber module 120 is made of PEEK (polyetheretherketone). In this embodiment, the chamber 121 has a substantially cylindrical shape with a substantially circular cross-section having a diameter of about 15 millimeters. The cylindrical shape and circular cross-section of the chamber 121 substantially correspond to the cylindrical shape and circular cross-section of the aerosol generating article 200.

[0149] The chamber 121 includes an inner surface 130 that extends over the entire axial length of the chamber 121. In this embodiment, the axial length of the chamber 121 ranges from 25 millimeters to 28 millimeters. Along the central axis 122 of the chamber 121, the inner surface 130 includes a first axial portion 131, a second axial portion 132, and a third axial portion 133. The first axial portion 131 is closer to the proximal end 124 of the chamber 121 than the second axial portion 132, and the third axial portion 133 is closer to the distal end 123 of the chamber 121 than the second axial portion 132. Thus, the second axial portion 132 is located between the first axial portion 131 and the third axial portion 133. The length of the second axial portion 132 is about 33 percent (about 1 / 3) of the axial length 129 of the chamber 121. The same applies to the length of the first axial portion 131. In contrast, the length of the third axial portion 133 is slightly shorter than the lengths of the first axial portion 131 and the second axial portion 132.

[0150] The first axial portion 131 includes a plurality of first protrusions 141 that extend in a direction from a reference surface region 145 of the first axial portion 131, beyond a reference surface region 146 of the second axial portion 132, and toward the central axis 122. Similarly, the third axial portion 133 includes a plurality of second protrusions 143 that extend in a direction from a reference surface region 147 of the third axial portion 133, beyond a reference surface region 146 of the second axial portion 132, and toward the central axis 122. In contrast to the first axial portion 131 and the third axial portion 133, the second axial portion 132 does not include protrusions. Instead, the second axial portion 132 is dimpled and includes a plurality of depressions 142 that extend outwardly in a direction away from the central axis 122 from a reference surface region 146 of the second axial portion 132.

[0151] Accordingly, when the article 200 is inserted into the chamber 121, the article 200 contacts only the plurality of first protrusions 141 and the plurality of second protrusions 143. In contrast, the article 200 does not contact the second axial portion 132 of the inner surface 130. As a result, the overall contact area between the article 200 and the inner surface 130 of the chamber 121 is significantly reduced. Advantageously, this results in an overall reduction in heat loss due to direct heat conduction from the aerosol-generating article 200 to the inner surface 130. Further, the adverse wetting effect on the article 200 due to condensate formation in the chamber 121 is also reduced. Additionally, the reduction in the contact surface area facilitates the insertion and removal of the article 200 by reducing the frictional force to be overcome when moving the article 200 into or out of the chamber 121.

[0152] Despite the reduced contact area between the article 200 and the inner surface 130, the article 200 is still firmly held within the chamber 121 by the first protrusion 131 and the second protrusion 132. In this embodiment, this is even more applicable because the arrangement and dimensions of the first axial portion 131, the second axial portion 132, and the third axial portion 133 are adapted to the proximal support element 230, the base element 220, and the distal support element 210. As can be seen in FIG. 1, when the article 200 is received within the chamber 121, the proximal support element 230 contacts the first protrusion 141 of the first axial portion 131, and the distal support element 210 contacts the second protrusion 143 of the third axial portion 133. In contrast, the base element 220 is substantially surrounded by, but does not contact, the second axial portion 132. Only at its very axial ends does the base element 220 partially contact the first protrusion 141 of the first axial portion 131 and the second protrusion 143 of the third axial portion 133. However, in an alternative embodiment, it will be understood that even at its very axial ends, the base element 220 may not contact the protrusions 141, 143, or the first axial portion 131 and the third axial portion 133, and instead the entire base element 220 may be within the second axial portion 132. With these particular configurations, the first protrusion 141 and the second protrusion 143 of the first axial portion 131 and the second axial portion 133 engage substantially only with those portions of the article 200 that are the most rigid and have the least shrinkage during use.

[0153] Furthermore, referring to FIG. 1, the free space between the first protrusion 141 and the second protrusion 143 forms a multi-dimensional matrix of air flow paths that allows air to flow between the inner surface 130 of the chamber 121 and the outer surface of the aerosol generating article 200 inserted into the chamber 121. Thus, when a negative pressure is applied to the filter element 250 of the aerosol generating article 200 received within the receiving chamber 121, for example, when a user smokes, air is drawn into the receiving chamber 121 at the periphery of the insertion opening 126 at the proximal end 101 of the device 100 or the proximal end 124 of the chamber 121, respectively. This air flow further passes along the inner surface 130 along the multi-channel air flow path and enters the bottom portion at the distal end 123 of the receiving chamber 121. Here, the air flow enters the aerosol generating article 200 through the distal support element 210, further passes through the base element 220, the proximal support element 230, the aerosol cooling element 240, and the filter element 250, and finally exits the article 200. In the base element 240, the vaporized material from the aerosol forming base is entrained by the air flow and then cooled along its further path, for example, through the proximal support element 230, the aerosol cooling element 240, and the filter element 250 to form an aerosol. To enable proper redirection of the air flow into the aerosol generating article 200 at the distal end 123 of the receiving chamber 121, the aerosol generating device 100 according to this embodiment includes an end stop 128 disposed at the distal end 123 of the receiving chamber 121. The end stop 128 limits the insertion depth of the article 200 into the receiving chamber 121 and is thus configured to prevent the article 200 from contacting the bottom surface of the receiving chamber 121. This is shown in FIG. 1.

[0154] From the proximal end 124 of the chamber 121, for the airflow passing along the inner surface 130 towards the distal end 123 of the chamber 121, the plurality of depressions 142 in the second axial portion 132 cause the airflow to be turbulent along the second axial portion 132. Advantageously, the turbulent airflow improves the airflow management through the device 100 and, in particular, ensures sufficient heat exchange between the air flowing around the article. Further, the dimples 142 in the second axial portion 132 advantageously promote turbulent airflow in the region of the second axial portion 132, which helps to provide improved aerosol characteristics compared to conventional aerosol generation systems.

[0155] In the present embodiment, the first protrusion 141 and the second protrusion 143 are formed as dot-shaped protrusions having a pimple shape. The first protrusion 141 and the second protrusion 143 are arranged in a regular matrix pattern. In contrast, the plurality of depressions 142 have a cylindrical shape with a hexagonal cross-section. That is, the opening region of each depression 142 has a hexagonal shape or a hexagonal cross-section. The depressions 142 are arranged in a hexagonal pattern, in particular, a honeycomb configuration. Accordingly, the reference plane region 146 of the second axial portion 132 has a hexagonal grid pattern, in particular, a honeycomb pattern.

[0156] The reference plane regions of the first axial portion 131 and the third axial portion 133, and both of the reference plane regions of the second axial portion are coherent regions having no separated sections.

[0157] As can be seen particularly in FIG. 4, the first protrusion 141 and the second protrusion 143 have the same height dimension 148. Similarly, all the depressions 142 have the same depth dimension 149. For good airflow management, the height dimension 148 is preferably in the range of 0.5 millimeters to 2 millimeters, particularly in the range of 0.75 millimeters to 1.5 millimeters, when measured radially towards the central axis 122. Similarly, the depression 142 preferably has a depth dimension 149 in the range of 0.25 millimeters to 2 millimeters, preferably in the range of 0.5 millimeters to 1 millimeter, in a direction perpendicular to the opening area of each depression.

[0158] The formation of turbulent airflow can also be affected by the density of the depressions 147. The density of the plurality of depressions 147 is preferably in the range of 0.1 to 1.0 depressions per square millimeter, preferably in the range of 0.2 to 0.7 depressions per square millimeter. Similarly, the density of the plurality of first protrusions 141 and second protrusions 143 is in the range of 0.25 to 1.5 protrusions per square millimeter, particularly in the range of 0.5 to 0.75 protrusions per square millimeter. As used herein, the density per square millimeter refers to the area capacity of the axial portions 131, 132, 133 of the protrusions on the envelope surface that touches each point of the respective reference plane areas 145, 146, 147 in a direction perpendicular to the reference plane area, that is, as shown by the dashed lines 191, 192 in FIG. 4. In this embodiment, the density of the plurality of first protrusions 141 and the density of the plurality of second protrusions 143 are the same, but smaller than the density of the plurality of depressions 147.

[0159] Figures 5 and 6 schematically show respective sections of alternative embodiments of the first and third axial portions of the inner surfaces 231, 233, 331, 333. In Figure 5, the first protrusion 241 and the second protrusion 243 have a cubic shape and are arranged in a regular square pattern. Accordingly, the respective reference plane regions 245, 247 have a regular square grid pattern. In Figure 6, the first protrusion 341 and the second protrusion 343 have a pyramid shape. The respective reference plane regions 345, 347 have a cross-intersecting grid pattern so as to provide a linear air flow path between the first protrusion 341 and the second protrusion 343, respectively.

[0160] Figure 7 shows an alternative embodiment of the second axial portion 432. In the figure, the second axial portion 432 includes a plurality of depressions 442 having a circular cross section, each of which has a partial spherical shape. That is, the opening region of each depression 442 has a circular shape or a circular cross section. The depressions 442 are arranged in a square grid pattern.

[0161] For the purposes of this specification and the appended claims, unless otherwise indicated, all numbers expressing amounts, quantities, percentages, etc. are to be understood as being modified in all instances by the term "about". Also, all ranges include the maximum and minimum points disclosed, and any intermediate ranges therebetween, whether or not specifically enumerated herein. Thus, in this context, the number A is understood to be A ± 5 percent.

Claims

1. An aerosol generating device for use with an aerosol generating article, the aerosol generating device comprising a chamber for removably receiving at least a portion of the aerosol generating article, along a central axis of the chamber, an inner surface of the chamber including a first axial portion and a second axial portion, the first axial portion being closer to a proximal end of the chamber than the second axial portion, the second axial portion being dimpled with a plurality of indentations, the plurality of indentations being dot-like and extending outwardly in a direction away from the central axis from a reference plane region of the second axial portion, the first axial portion including a plurality of first protrusions, the plurality of first protrusions being configured to contact at least a portion of the aerosol generating article received within the chamber, the plurality of first protrusions extending in a direction from a reference plane region of the first axial portion toward the central axis beyond the reference plane region of the second axial portion. An aerosol generating device.

2. Along a central axis of the chamber, the inner surface of the chamber includes a third axial portion, the third axial portion being closer to a distal end of the chamber than the second axial portion, the third axial portion including a plurality of second protrusions, the plurality of second protrusions being configured to contact at least a portion of the aerosol generating article received within the chamber, the plurality of second protrusions extending in a direction from a reference plane region of the third axial portion toward the central axis beyond the reference plane region of the second axial portion. The aerosol generating device according to claim 1.

3. At least one of the plurality of indentations has a conical shape, or a frustum of a cone shape, or a pyramid shape, or a pinpule shape, or a frustum of a pyramid shape, or a dome shape, or a cube shape, or a partial spherical shape, or a cylindrical shape, or a triangular prism shape, or a polyhedron shape. The aerosol generating device according to any one of claims 1 or 2.

4. The aerosol generator according to any one of claims 1 to 3, wherein at least one of the plurality of depressions has an opening region in a circular shape, or an oval shape, or an elliptical shape, or a rectangular shape, or a quadratic surface shape, or a rhombic shape, or a parallelogram shape, or a triangular shape, or a hexagonal shape, or a polygonal shape.

5. The aerosol generator according to any one of claims 1 to 4, wherein the density of the plurality of depressions is in the range of 0.1 to 1.0 depressions per square millimeter.

6. The aerosol generator according to any one of claims 1 to 5, wherein at least one of the plurality of depressions has a depth dimension in the range of 0.25 millimeters to 2 millimeters in a direction perpendicular to the opening region of each depression.

7. The aerosol generator according to claim 2, wherein each of the reference plane regions of the second axial portion, the reference plane region of the first axial portion, and the reference plane region of the third axial portion is a coherent region.

8. The aerosol generator according to any one of claims 1 to 7, wherein the reference plane region of the second axial portion has a hexagonal grid pattern.

9. The aerosol generator according to claim 2 or 7, wherein at least one of the reference plane region of the first axial portion and the reference plane region of the third axial portion has a cross-intersecting grid pattern.

10. The aerosol generator according to any one of claims 1 to 9, wherein the second axial portion has a length of at least 20 percent of the total length of the inner surface or the chamber in the direction of the central axis.

11. The aerosol generator according to claim 2, wherein at least one of the plurality of first protrusions has a conical shape, or a frustum of a cone shape, or a pyramid shape, or a pimple shape, or a frustum of a pyramid cone shape or a dome shape or a cube shape or a partial spherical shape, or a cylindrical shape or a triangular prism shape, or a polyhedral shape, and / or at least one of the plurality of second protrusions has a conical shape, or a frustum of a cone shape, or a pyramid shape, or a pimple shape, or a frustum of a pyramid cone shape, or a dome shape, or a cube shape, or a partial spherical shape, or a cylindrical shape, or a triangular prism shape, or a polyhedral shape.

12. The aerosol generating device according to claim 2 or 11, wherein at least one of the density of the plurality of first protrusions and the density of the plurality of second protrusions is in the range of 0.25 to 1.5 protrusions per square millimeter.

13. The aerosol generating device according to claim 2, 11, or 12, wherein at least one of the plurality of first protrusions has a height dimension in the range of 0.5 millimeters to 2 millimeters, and / or at least one of the plurality of second protrusions has a height dimension in the range of 0.5 millimeters to 2 millimeters.

14. An aerosol generating system comprising the aerosol generating device according to claim 2, 7, or 9 and an aerosol generating article comprising an aerosol forming substrate, wherein at least a part of the aerosol generating article is removably received or receivable within the chamber of the aerosol generating device.

15. The aerosol generating system according to claim 14, wherein the aerosol generating article comprises at least a proximal support element, a distal support element, and a substrate element comprising the aerosol forming substrate, the substrate element being located downstream of the proximal support element and upstream of the distal support element with respect to an air flow passing through the article during use of the system, and when the article is received within the chamber, the proximal support element contacts the first axial portion, the third axial portion contacts the distal support element, and the substrate element is surrounded by the second axial portion without contacting the second axial portion.

Images