Aerosol-generating device with planar heating assembly

Abstract

An aerosol-generating system comprises an aerosol-generating article (20) and an aerosol-generating device (1). The aerosol-generating article (20) comprises: a housing (23) defining a substrate cavity (201); and an aerosol-forming substrate (21) disposed in the substrate cavity (201). The aerosol-generating device (1) comprises: a heating chamber (3) configured to receive at least a portion of an aerosol-generating article (20), the heating chamber (3) being defined at one side by a planar chamber surface (4) extending substantially in a plane; a first heating assembly (6) comprising a planar first heating element extending substantially in a first plane parallel to the plane of the cavity surface; and a second heating assembly (7) comprising a planar second heating element extending substantially in a second plane parallel to the plane of the cavity surface.

Description

Technical Field

[0001] The present invention relates to an aerosol generating device and an aerosol generating system including the aerosol generating device. Background Art

[0002] Some known aerosol generating systems include an aerosol generating device having a power source (such as a battery), a controller, and a heating element for heating an aerosol-forming substrate. In some instances, the aerosol-forming substrate includes a tobacco strip or a tobacco rod disposed in an aerosol generating article. In use, the aerosol generating article is inserted into a cavity of the aerosol generating device, and the heating element penetrates the aerosol-forming substrate or is disposed around the outer side of the aerosol-forming substrate. Electric power is supplied from the power source to the heating element to heat the aerosol-forming substrate, and the volatile components of the aerosol-forming substrate are vaporized and released and condensed to form an aerosol that can be inhaled by a user. In some such aerosol generating systems, the aerosol generating article resembles a conventional cigarette having a similar cylindrical rod-like configuration.

[0003] There is a desire to provide an aerosol generating system capable of heating more than one aerosol-forming substrate to improve user control over the aerosol generated by the aerosol generating system. There is also a desire to provide an even more compact and easier to manufacture aerosol generating system. Summary of the Invention

[0004] According to the present disclosure, there is provided an aerosol generating system including an aerosol-forming substrate and an aerosol generating device. The aerosol generating system may further include an aerosol generating article including the aerosol-forming substrate. The aerosol generating article may include a housing defining a substrate cavity. The aerosol-forming substrate may be disposed in the substrate cavity. The aerosol generating device may include: a heating cavity configured to receive at least a portion of the aerosol generating article. The heating cavity may be defined at one side by a planar cavity surface extending substantially in a plane. The aerosol generating device may include a first heating assembly including a planar first heating element extending substantially in a first plane. The first plane may be parallel to the plane of the cavity surface. The aerosol generating device may include a second heating assembly including a planar second heating element extending substantially in a second plane. The second plane may be parallel to the plane of the cavity surface.

[0005] According to the present disclosure, an aerosol generating system is provided, which includes an aerosol-forming substrate and an aerosol generating device. The aerosol generating system further includes an aerosol generating article, and the aerosol generating article includes a housing defining a substrate cavity. The aerosol generating article further includes an aerosol-forming substrate disposed in the substrate cavity. The aerosol generating device includes: a heating cavity configured to receive at least a portion of the aerosol generating article. The heating cavity is defined at one side by a planar cavity surface extending substantially in a plane. The aerosol generating device includes a first heating assembly, and the first heating assembly includes a planar first heating element extending substantially in a first plane. The first plane is parallel to the plane of the cavity surface. The aerosol generating device includes a second heating assembly, and the second heating assembly includes a planar second heating element extending substantially in a second plane. The second plane is parallel to the plane of the cavity surface.

[0006] Advantageously, an aerosol generating device having a heating cavity and two heating assemblies can provide a compact device that enables efficient transfer of heat from the heating assemblies to the aerosol-forming substrate in the heating cavity, the heating cavity having a planar cavity surface and each heating assembly having a planar heating element extending in a plane parallel to the plane of the cavity surface.

[0007] In some embodiments, the first plane and the second plane are coplanar. In other words, in some embodiments, the first plane and the second plane are the same plane. The first planar heating element and the second planar heating element may extend in the same plane. In some of these embodiments, the first plane and the plane of the cavity surface are coplanar. In other words, in some of these embodiments, the first plane, the second plane, and the plane of the cavity surface are the same plane. The first planar heating element and the second planar heating element may extend in the plane of the cavity surface. The first heating element may be disposed at the cavity surface. The second heating element may be disposed at the cavity surface.

[0008] In some embodiments, the planar cavity surface includes a first planar cavity surface and a second planar cavity surface. The second planar cavity surface is opposite to the first planar cavity surface. The first planar cavity surface extends substantially in a plane. The second planar cavity surface extends in a plane. Preferably, the plane of the second cavity surface is parallel to the plane of the first cavity surface. The distance between the first cavity surface and the second cavity surface may define the width of the heating cavity. In some of these embodiments, the first plane and the plane of the first cavity surface are coplanar. In other words, in some embodiments, the first plane and the plane of the first cavity surface are the same plane. The first planar heating element may extend in the plane of the first cavity surface. In some of these embodiments, the second plane and the plane of the second cavity surface are coplanar. In other words, in some embodiments, the second plane and the plane of the second cavity surface are the same plane. The second planar heating element may extend in the plane of the second cavity surface.

[0009] The first heating element may be arranged at the first chamber surface. The second heating element may be arranged at the second chamber surface. The first heating element and the second heating element may be arranged at opposite sides of the heating chamber. The first heating element and the second heating element may be arranged opposite to each other. In these embodiments, when the aerosol-forming substrate is arranged in the heating chamber, the aerosol-forming substrate may be arranged between the first heating element and the second heating element.

[0010] Advantageously, arranging the first heating element and the second heating element at opposite sides of the heating chamber such that when the aerosol-forming substrate is arranged in the heating chamber, the aerosol-forming substrate is arranged between the first heating element and the second heating element can provide a compact device that enables particularly efficient transfer of heat from the heating assembly to the aerosol-forming substrate in the heating chamber.

[0011] According to the present disclosure, an aerosol-generating device is provided. The aerosol-generating device may include: a heating chamber configured to receive an aerosol-forming substrate. The heating chamber may be defined at one side by a planar chamber surface that extends substantially in a plane. The aerosol-generating device may include a first heating assembly including a planar first heating element that extends substantially in a first plane. The first plane may be parallel to the plane of the chamber surface. The first heating element may be arranged at a first portion of the chamber surface or around a first portion of the chamber surface or form a first portion of the chamber surface. The aerosol-generating device may include a second heating assembly including a planar second heating element that extends substantially in a second plane. The second plane may be parallel to the plane of the chamber surface. The second heating element may be arranged at a second portion of the chamber surface or around a second portion of the chamber surface or form a second portion of the chamber surface.

[0012] According to the present disclosure, an aerosol-generating device is provided, which includes: a heating chamber configured to receive an aerosol-forming substrate, the heating chamber being defined at one side by a planar chamber surface that extends substantially in a plane. The aerosol-generating device further includes a first heating assembly and a second heating assembly. The first heating assembly includes a planar first heating element that extends substantially in a first plane parallel to the plane of the chamber surface, and the first heating element is arranged at a first portion of the chamber surface or around a first portion of the chamber surface or forms a first portion of the chamber surface. The second heating assembly includes a planar second heating element that extends substantially in a second plane parallel to the plane of the chamber surface, and the second heating element is arranged at a second portion of the chamber surface or around a second portion of the chamber surface or forms a second portion of the chamber surface.

[0013] In some preferred embodiments, the first planar heating element and the second planar heating element are arranged at the cavity surface. In some embodiments, the first planar heating element and the second planar heating element extend in the plane of the cavity surface.

[0014] Advantageously, an aerosol-generating device having two heating assemblies can provide a compact device that enables different aerosol-forming substrates to be heated independently or simultaneously. Each heating assembly has a planar cavity surface and a planar heating element that extends in the plane of the cavity surface and is arranged at or around the cavity surface. Providing two heating assemblies with a planar cavity surface and a planar heating element for an aerosol-generating device can also enable a user to accurately control the generation of aerosol from a plurality of substrates, the planar heating element extending in the plane of the cavity surface and being arranged at or around the cavity surface. Providing a heating assembly with a planar cavity surface and a planar heating element for an aerosol-generating device can also ensure efficient heat transfer from the heating assembly to the aerosol-forming substrate in the heating cavity, the planar heating element extending in the plane of the cavity surface and being arranged at or around the cavity surface.

[0015] According to the present disclosure, an aerosol-generating device is provided. The aerosol-generating device may include a heating cavity configured to receive an aerosol-forming substrate. The heating cavity may be defined at one side by a first planar cavity surface that extends substantially in a plane, and at an opposite side by a second planar cavity surface that extends substantially in a plane. The aerosol-generating device may include a first heating assembly that includes a planar first heating element that extends substantially in a first plane. The first plane may be parallel to the plane of the first cavity surface. The first heating element may be arranged at the first cavity surface or form a part of the first cavity surface. The aerosol-generating device may include a second heating assembly that includes a planar second heating element that extends substantially in a second plane. The second plane may be parallel to the plane of the second cavity surface. The second heating element may be arranged at the second cavity surface or form a part of the second cavity surface.

[0016] According to the present disclosure, an aerosol generating device is provided. The aerosol generating device includes: a heating chamber configured to receive an aerosol-forming substrate, the heating chamber being defined at one side by a first planar chamber surface extending substantially in a plane and at an opposite side by a second planar chamber surface extending substantially in a plane. The aerosol generating device further includes a first heating assembly including a planar first heating element extending substantially in the first plane. The first plane is parallel to the plane of the first chamber surface. The first heating element is disposed at the first chamber surface or forms a part of the first chamber surface. The aerosol generating device further includes a second heating assembly including a planar second heating element extending substantially in the second plane. The second plane is parallel to the plane of the second chamber surface. The second heating element is disposed at the second chamber surface or forms a part of the second chamber surface.

[0017] In some preferred embodiments, the first planar heating element and the second planar heating element are disposed opposite to each other at opposite sides of the heating chamber. In some embodiments, the first planar heating element extends in the plane of the first chamber surface, and the second planar heating element extends in the plane of the second chamber surface.

[0018] As used herein, "planar" refers to a feature that is generally formed in a single Euclidean plane and does not wrap around or otherwise accommodate a curved or other non-planar shape. A planar surface extends in two dimensions in a single Euclidean plane. A planar object extends in two dimensions in a single Euclidean plane by a substantially greater extent than it extends in a third dimension parallel to the plane. More specifically, a planar object extends in a first dimension and a second dimension perpendicular to the first dimension by at least two times, five times, or ten times the extent of the object in a third dimension perpendicular to the first dimension and the second dimension. Advantageously, the planar components of the heating assembly can be easily handled during manufacturing and provide a robust construction.

[0019] The aerosol generating device may be a flat aerosol generating device. The first heating assembly may be a flat heating assembly. The first heating element may be a flat heating element. The second heating assembly may be a flat heating assembly. The second heating element may be a flat heating element.

[0020] As used herein, "flat" refers to a substantially two-dimensional topological manifold. In other words, "flat" means substantially two-dimensional. An example of a flat object is a structure between two substantially parallel surfaces, where the distance between the two surfaces is substantially less than the extent within the surfaces. The flat feature extends much further in two dimensions than in the third dimension. More specifically, the flat feature extends in a first dimension and a second dimension perpendicular to the first dimension by at least five times the extent of the feature in a third dimension perpendicular to the first and second dimensions. A substantially flat feature can be planar. A substantially flat feature can be curved along one or more dimensions, such as to form a dome shape or a bridge shape. Advantageously, a flat aerosol-generating device can provide a robust construction that is easy for a user to handle and store. Advantageously, the flat components of the heating assembly can be easily handled during manufacture and provide a robust construction.

[0021] The aerosol-generating device can be a flat planar aerosol-generating device. The first heating assembly can be a flat planar heating assembly. The first heating element can be a flat planar heating element. The second heating assembly can be a flat planar heating assembly. The second heating element can be a flat planar heating element.

[0022] As used herein, an "aerosol-generating device" refers to a device that interacts with an aerosol-forming substrate to generate an aerosol.

[0023] As used herein, an "aerosol-forming substrate" refers to a substrate that is capable of releasing volatile compounds that can form an aerosol. Such volatile compounds can be released by heating the aerosol-forming substrate. The aerosol-forming substrate is typically part of an aerosol-generating article.

[0024] As used herein, an "aerosol-generating article" refers to an article that includes an aerosol-forming substrate capable of releasing volatile compounds that can form an aerosol. For example, the aerosol-generating article can be an article that generates an aerosol that can be directly inhaled by a user by inhaling or puffing at the mouthpiece at the proximal or mouth end of the aerosol-generating article, aerosol-generating device, or aerosol-generating system. The aerosol-generating article can be disposable.

[0025] As used herein, an "aerosol-generating system" refers to a combination of an aerosol-generating device and an aerosol-generating article. In an aerosol-generating system, the aerosol-generating article and the aerosol-generating device cooperate to generate an aerosol.

[0026] As used herein, "proximal" refers to the user end or mouth end of an aerosol-generating device, aerosol-generating article, or aerosol-generating system. The proximal end of a component of an aerosol-generating device, aerosol-generating article, or aerosol-generating system is the end of the component that is closest to the user end or mouth end of the aerosol-generating device, aerosol-generating article, or aerosol-generating system. As used herein, "distal" refers to the end opposite the proximal end.

[0027] As used herein, "end" and "side" may be used interchangeably to refer to the ends of features such as an aerosol-generating device, a heating assembly, a heating element, or an aerosol-generating article. Preferably, the features described herein have two opposite ends and at least one side extending between the two opposite ends. Preferably, the features described herein have a length extending in a longitudinal direction between the opposite ends and a width extending in a transverse direction between two opposite sides.

[0028] As used herein, "length" refers to the maximum dimension of a feature in the longitudinal direction of the feature.

[0029] As used herein, "width" refers to the maximum dimension of a feature in the transverse direction of the feature. The transverse direction is perpendicular to the longitudinal direction.

[0030] As used herein, "thickness" and "depth" refer to the maximum dimension of a feature in a direction perpendicular to the longitudinal direction of the feature and perpendicular to the transverse direction of the feature.

[0031] The aerosol-generating device may include a controller. The controller may include a microprocessor, which may be a programmable microprocessor, a microcontroller, or an application-specific integrated circuit (ASIC) or other circuitry capable of providing control. The controller may include other electronic components.

[0032] The controller may be configured to control the power supply to a first heating assembly to heat a first heating element.

[0033] The controller may be configured to control the power supply to a second heating assembly to heat a second heating element.

[0034] The controller may be configured to selectively control the power supply to the first heating assembly and selectively control the power supply to the second heating assembly. The aerosol-generating device may include a user interface. The user interface may have a first user input configured to enable a user to selectively control the power supply to the first heating assembly. The user interface may have a second user input configured to enable a user to selectively control the power supply to the second heating assembly.

[0035] The user interface can be any suitable user interface. The user interface can include one or more physical user inputs, such as buttons or switches. The user interface can include a touch screen. In the case where the user interface includes a touch screen, one or more user inputs can be part of the touch screen.

[0036] Advantageously, implementing selective control of the power supply to the first heating component and selective control of the power supply to the second heating component can provide the user with improved control over the aerosol generated by the aerosol generating device from the aerosol-forming substrate received in the heating chamber.

[0037] The controller can be configured to control the power supply to the first heating component to heat the first heating element to a first operating temperature.

[0038] The controller can be configured to control the power supply to the second heating component to heat the second heating element to a second operating temperature. In some embodiments, the second operating temperature is the same as the first operating temperature. In some preferred embodiments, the second operating temperature is different from the first operating temperature.

[0039] As used herein, "operating temperature" is the temperature at which volatile compounds are released from the aerosol-forming substrate.

[0040] The controller can be configured to control the power supply to the first heating component to heat the first heating element to a first operating temperature of at least about 100 degrees Celsius, or at least about 200 degrees Celsius, or at least about 300 degrees Celsius. The controller can be configured to control the power supply to the first heating component to heat the first heating element to a first operating temperature not exceeding about 350 degrees Celsius or not exceeding about 280 degrees Celsius. The controller can be configured to control the power supply to the first heating component to heat the first heating element to a first operating temperature between about 100 degrees Celsius and about 350 degrees Celsius or between about 200 degrees Celsius and about 280 degrees Celsius.

[0041] The controller can be configured to control the power supply to the second heating component to heat the second heating element to a second operating temperature of at least about 100 degrees Celsius, or at least about 200 degrees Celsius, or at least about 300 degrees Celsius. The controller can be configured to control the power supply to the second heating component to heat the second heating element to a second operating temperature not exceeding about 350 degrees Celsius or not exceeding about 280 degrees Celsius. The controller can be configured to control the power supply to the second heating component to heat the second heating element to a second operating temperature between about 100 degrees Celsius and about 350 degrees Celsius or between about 200 degrees Celsius and about 280 degrees Celsius.

[0042] The controller can be configured to control the power supply to the second heating component independently of the power supply to the first heating component.

[0043] Advantageously, controlling the power supply to the second heating component independently of the power supply to the first heating component can enable improved control of the aerosol generated by the aerosol generating device from the aerosol-forming substrate received in the heating chamber. Particularly advantageously, controlling the power supply to the second heating component independently of the power supply to the first heating component can enable a first aerosol-forming substrate disposed in the heating chamber at or around a first portion of the chamber surface to be heated independently of a second aerosol-forming substrate disposed in the heating chamber at or around a second portion of the chamber surface.

[0044] The controller may be configured to control the power supply to the first heating component and the second heating component such that power is supplied to the first heating component and the second heating component simultaneously.

[0045] The controller may be configured to control the power supply to the first heating component and the second heating component such that power is supplied to the first heating component and the second heating component such that power is supplied only to the first heating component. The controller may be configured to control the power supply to the first heating component and the second heating component such that power is supplied to the first heating component and the second heating component such that power is supplied only to the second heating component.

[0046] The aerosol generating device may include an aerosol-forming substrate detector.

[0047] In some preferred embodiments, the chamber surface is a first chamber surface, and a heating chamber is further defined at a second chamber surface opposite the first chamber surface. The aerosol-forming substrate detector may be disposed at or around the second chamber surface.

[0048] The controller may be configured to control the power supply to the first heating component based on a signal received from the aerosol-forming substrate detector. The controller may be configured to control the power supply to the second heating component based on a signal received from the aerosol-forming substrate detector.

[0049] Advantageously, controlling the power supply to the first heating component and the second heating component based on a signal received from the aerosol-forming substrate detector can enable the controller to adjust the temperature to which the aerosol-forming substrate is heated based on at least one of the type and composition of the aerosol-forming substrate to optimize aerosol generation from the aerosol-forming substrate.

[0050] The aerosol-forming substrate detector may be any suitable type of detector. For example, the aerosol-forming substrate detector may be a camera. The aerosol-forming substrate detector may be an optical sensor. The aerosol-forming substrate detector may be a barcode reader.

[0051] In some embodiments, the aerosol - forming substrate detector may be configured to detect at least one of the type and composition of the aerosol - forming substrate. In some embodiments, the aerosol - forming substrate detector may be configured to detect an identifier associated with the aerosol - forming substrate, such as a barcode or a QR code. The identifier contains information about at least one of the type and composition of the aerosol - forming substrate. In some preferred embodiments, the aerosol - forming substrate is provided in an aerosol - generating article, and the aerosol - generating article may include an identifier.

[0052] In some embodiments, the aerosol - generating device includes a first aerosol - forming substrate detector and a second aerosol - forming substrate detector. The first aerosol - forming substrate detector may be arranged at or around a first portion of the chamber surface. The second aerosol - forming substrate detector may be arranged at or around a second portion of the chamber surface.

[0053] In the case where the chamber surface is a first chamber surface and a heating chamber is further defined at the second chamber surface, the first aerosol - forming substrate detector may be arranged at or around a first portion of the second chamber surface opposite to the first portion of the first chamber surface, and the second aerosol - forming substrate detector may be arranged at or around a second portion of the second chamber surface opposite to the second portion of the first chamber surface.

[0054] The controller may be configured to control the power supply to the first heating assembly based on the signal received from the first aerosol - forming substrate detector. The controller may be configured to control the power supply to the second heating assembly based on the signal received from the second aerosol - forming substrate detector.

[0055] Advantageously, controlling the power supply to the first heating assembly based on the signal received from the first aerosol - forming substrate detector and controlling the power supply to the second heating assembly based on the signal received from the second aerosol - forming substrate detector may enable the controller to adjust the temperature to which each of the first aerosol - forming substrate and the second aerosol - forming substrate is heated independently of each other to optimize aerosol generation from each of the first aerosol - forming substrate and the second aerosol - forming substrate.

[0056] In some embodiments, the second heating element is substantially the same as the first heating element.

[0057] In some embodiments, the second heating element is different from the first heating element.

[0058] The first heating element may have a first heating element shape. The second heating element may have a second heating element shape. The second heating element shape may be substantially the same as the first heating element shape. The second heating element shape may be different from the first heating element shape.

[0059] The first heating element shape may be any suitable shape. The first heating element shape may be one of a circle, an ellipse, a polygon, a square, or preferably a rectangle.

[0060] The second heating element shape may be any suitable shape. The second heating element shape may be one of a circle, an ellipse, a polygon, a square, or preferably a rectangle.

[0061] The first heating element may have a first heating element size. The second heating element may have a second heating element size. The second heating element size may be substantially the same as the first heating element size. The second heating element size may be different from the first heating element size.

[0062] The first heating element has a first heating element length. The first heating element length may be any suitable length. The first heating element length may be between about 15 millimeters and about 20 millimeters.

[0063] The second heating element has a second heating element length. The second heating element length may be any suitable length. The second heating element length may be between about 15 millimeters and about 20 millimeters.

[0064] The first heating element has a first heating element width. The first heating element width may be any suitable width. The first heating element width may be between about 10 millimeters and about 15 millimeters.

[0065] The second heating element has a second heating element width. The second heating element width may be any suitable width. The second heating element width may be between about 10 millimeters and about 15 millimeters.

[0066] The first heating element has a first heating element thickness. The first heating element thickness may be any suitable thickness. The first heating element thickness may be between about 0.1 millimeter and about 0.5 millimeter.

[0067] The second heating element has a second heating element thickness. The second heating element thickness may be any suitable thickness. The second heating element thickness may be between about 0.1 millimeter and about 0.5 millimeter.

[0068] The first heating element and the second heating element may be made of any suitable material. The first heating element and the second heating element may be formed of the same material. The second heating element may be formed of a material different from the first heating element.

[0069] The first heating element can be formed of a conductive material. The second heating element can be formed of a conductive material.

[0070] As used herein, "conductive" means that the material has a volume resistivity of less than about 1×10 -5 ohm-meters (Ωm) at 20 degrees Celsius (°C), typically between about 1×10 -5 ohm-meters (Ωm) and about 1×10 -9 ohm-meters (Ωm).

[0071] The first heating element can be formed of a thermally conductive material. The second heating element can be formed of a thermally conductive material.

[0072] As used herein, "thermally conductive" means that the material has a volume thermal conductivity of at least about 10 milliwatts per meter kelvin (mW / (mK)) when measured using the modified transient plane source (MTPS) method at 23 degrees Celsius (°C) and 50% relative humidity.

[0073] The first heating element can be formed of at least one of the following: graphite, molybdenum, silicon carbide, metal, stainless steel, niobium, aluminum, nickel, titanium, and composites of metallic materials.

[0074] The second heating element can be formed of at least one of the following: graphite, molybdenum, silicon carbide, metal, stainless steel, niobium, aluminum, nickel, titanium, and composites of metallic materials.

[0075] The first heating assembly can be any suitable type of heating assembly. The first heating element can be any suitable type of heating element.

[0076] The first heating assembly can be a resistive heating assembly. In some embodiments, the first heating element is a resistive heating element.

[0077] The second heating assembly can be any suitable type of heating assembly. The second heating element can be any suitable type of heating element.

[0078] The second heating assembly can be a resistive heating assembly. In some embodiments, the second heating element is a resistive heating element.

[0079] In some embodiments, the first heating assembly is an induction heating assembly.

[0080] The first heating assembly can include a first inductor coil. The first inductor coil can have any suitable form. The first inductor coil can be a tubular first inductor coil. The first inductor coil can be a planar first inductor coil that extends substantially in a first plane parallel to the surface of the cavity. The first inductor coil can be a flat inductor coil. Preferably, the first inductor coil can be a flat planar inductor coil.

[0081] The first inductor coil has a first inductor coil shape. The first inductor coil shape can be any suitable shape. The first inductor coil can have one of a circular shape, an oval shape, a polygonal shape, a square shape, or preferably a rectangular shape.

[0082] As used herein, a "planar inductor coil" refers to a coil that is generally located in a single Euclidean plane, where the winding axis of the coil is perpendicular to the plane in which the coil lies. The planar inductor coil can have any desired shape within the plane of the coil. For example, the planar inductor coil can have a circular shape or preferably can have a generally rectangular or square shape. Preferably, the inductor coil is a spiral coil. Particularly preferably, the inductor coil is a planar, rectangular, spiral coil.

[0083] The first inductor coil has a first inductor coil size. The first inductor coil size can be any suitable size. The first inductor coil has a first inductor coil length. The first inductor coil length can be any suitable length. The first inductor coil length can be between about 15 millimeters and about 20 millimeters. The first inductor coil has a first inductor coil width. The first inductor coil width can be any suitable width. The first inductor coil width can be between about 10 millimeters and about 15 millimeters. The first inductor coil has a first inductor coil thickness. The first inductor coil thickness can be any suitable thickness. The first inductor coil thickness can be between about 0.1 millimeter and about 0.5 millimeter.

[0084] The first inductor coil can have any suitable number of turns.

[0085] The first inductor coil can be formed of any suitable material. The first inductor coil can be formed of at least one of the following: silver, gold, aluminum, brass, zinc, iron, nickel, and their alloys, and conductive ceramics (such as yttrium-doped zirconia, indium tin oxide, and yttrium-doped titanates).

[0086] The first inductor coil shape can be different from the first heating element shape. In some preferred embodiments, the first inductor coil shape is substantially the same as the first heating element shape.

[0087] The first inductor coil size can be different from the first heating element size. In some preferred embodiments, the first inductor coil size is substantially the same as the first heating element size.

[0088] Preferably, the first heating element can be disposed between the cavity surface and the first inductor coil.

[0089] When a first varying current is supplied to the first inductor coil, the first inductor coil can generate a first varying magnetic field.

[0090] As used herein, "varying current" refers to a current that varies with time. When a varying current is supplied to the inductor coil, the inductor coil generates a varying magnetic field. The term "varying current" is intended to include alternating current. In the case where the varying current is alternating current, the alternating current generates an alternating magnetic field.

[0091] The varying current can be alternating current. As used herein, "alternating current" refers to a current that periodically changes direction. The alternating current can have any suitable frequency. The suitable frequency of the alternating current can be between 100 kilohertz (kHz) and 30 megahertz (MHz). In the case where at least one inductor coil is a tubular inductor coil, the alternating current can have a frequency between 500 kilohertz (kHz) and 30 megahertz (MHz). In the case where at least one inductor coil is a flat coil, the alternating current can have a frequency between 100 kilohertz (kHz) and 1 megahertz (MHz).

[0092] The planar first heating element can be a planar first susceptor element.

[0093] As used herein, "susceptor" refers to an element that can be heated by the penetration of a varying magnetic field. The susceptor can generally be heated by at least one of Joule heating of eddy currents induced in the susceptor element and hysteresis loss.

[0094] In the case where the first heating assembly includes a first inductor coil and the first heating element is a first susceptor element, the first susceptor element can be arranged to be penetrated by a first varying magnetic field generated by the first inductor coil when a first varying current is supplied to the first inductor coil.

[0095] The first susceptor element can be formed of any suitable material. Preferably, the first susceptor element includes a magnetic material that can be heated by the penetration of a varying magnetic field. The magnetic material can be a ferromagnetic material, such as ferrite, ferritic iron, ferromagnetic alloy, ferromagnetic steel, or ferromagnetic stainless steel, and the ferromagnetic stainless steel is, for example, SAE 400 series stainless steel, SAE 409, 410, 420, or 430 type stainless steel.

[0096] As used herein, "magnetic material" refers to a material that can interact with a magnetic field, including both paramagnetic and ferromagnetic materials.

[0097] In some preferred embodiments, the first susceptor element includes at least about 5%, or at least about 20%, or at least about 50%, or at least about 90% of ferromagnetic material or paramagnetic material by dry weight.

[0098] The shape of the first susceptor element can be different from the shape of the first inductor coil. Preferably, the shape of the first susceptor element is substantially the same as the shape of the first inductor coil.

[0099] The size of the first inductor coil can be different from the size of the first inductor coil. Preferably, the size of the first receptor element is substantially the same as the size of the first inductor coil.

[0100] In some embodiments, the second heating assembly is an induction heating assembly.

[0101] The second heating assembly may include a second inductor coil. The second inductor coil can have any suitable form. The second inductor coil can be a tubular second inductor coil. The second inductor coil can be a planar second inductor coil extending substantially in a second plane parallel to the surface of the cavity. The second inductor coil can be a flat inductor coil. Preferably, the second inductor coil can be a flat planar inductor coil.

[0102] The second inductor coil has a second inductor coil shape. The second inductor coil shape can be any suitable shape. The second inductor coil can have one of a circular shape, an oval shape, a polygonal shape, a square shape, or a preferred rectangular shape.

[0103] The second inductor coil has a second inductor coil size. The second inductor coil size can be any suitable size. The second inductor coil has a second inductor coil length. The second inductor coil length can be any suitable length. The second inductor coil length can be between about 15 millimeters and about 20 millimeters. The second inductor coil has a second inductor coil width. The second inductor coil width can be any suitable width. The second inductor coil width can be between about 10 millimeters and about 15 millimeters. The second inductor coil has a second inductor coil thickness. The second inductor coil thickness can be any suitable thickness. The second inductor coil thickness can be between about 0.1 millimeter and about 0.5 millimeter.

[0104] The second inductor coil can have any suitable number of turns.

[0105] The second inductor coil can be formed of any suitable material. The second inductor coil can be formed of at least one of the following: silver, gold, aluminum, brass, zinc, iron, nickel, and their alloys, and conductive ceramics (such as yttrium-doped zirconia, indium tin oxide, and yttrium-doped titanates).

[0106] The second inductor coil shape can be different from the second heating element shape. In some preferred embodiments, the second inductor coil shape is substantially the same as the second heating element shape.

[0107] The second inductor coil size can be different from the second heating element size. In some preferred embodiments, the second inductor coil size is substantially the same as the second heating element size.

[0108] Preferably, the second heating element may be disposed between the cavity surface and the second inductor coil.

[0109] When a second varying current is supplied to the second inductor coil, the second inductor coil may generate a second varying magnetic field.

[0110] The planar second heating element may be a planar second receptor element.

[0111] In the case where the second heating assembly includes a second inductor coil and the second heating element is a second receptor element, the second receptor element may be arranged such that the second varying magnetic field generated by the second inductor coil penetrates when the second varying current is supplied to the second inductor coil.

[0112] The second receptor element may be formed of any suitable material. Preferably, the second receptor element includes a magnetic material that can be heated by the penetration of a varying magnetic field. The magnetic material may be a ferromagnetic material such as ferrite, ferritic iron, ferromagnetic alloy, ferromagnetic steel, or ferromagnetic stainless steel, and the ferromagnetic stainless steel may be, for example, SAE 400 series stainless steel, SAE 409, 410, 420, or 430 type stainless steel.

[0113] In some preferred embodiments, the second receptor element includes at least about 5%, or at least about 20%, or at least about 50%, or at least about 90% ferromagnetic or paramagnetic material by dry weight.

[0114] The shape of the second receptor element may be different from the shape of the second inductor coil. Preferably, the shape of the second receptor element is substantially the same as the shape of the second inductor coil.

[0115] The size of the second receptor element may be different from the size of the second inductor coil. Preferably, the size of the second receptor element is substantially the same as the size of the second inductor coil.

[0116] In some embodiments, the first heating assembly is an induction heating assembly and the second heating assembly is an induction heating assembly. In some embodiments, the first heating assembly is a resistance heating assembly and the second heating assembly is a resistance heating assembly. In some embodiments, the first heating assembly is an induction heating assembly and the second heating assembly is a resistance heating assembly. In some embodiments, the first heating assembly is a resistance heating assembly and the second heating assembly is an induction heating assembly.

[0117] The first heating assembly may further include a first shielding element.

[0118] The first shielding element may be a planar first shielding element extending substantially in a first plane parallel to the surface of the cavity. The first shielding element may be a flat first shielding element. The first shielding element may be a flat planar shielding element.

[0119] The first shielding element may be arranged in any suitable position. Preferably, the first heating element is arranged between the surface of the cavity and the first shielding element. In the case where the first heating assembly includes a first inductor coil, a first heating element and a first shielding element, the first inductor coil may be arranged between the first heating element and the first shielding element.

[0120] The first shielding element has a first shielding element shape. The first shielding element shape may be any suitable shape. The first shielding element shape may be different from the first heating element shape. Preferably, the first shielding element shape is substantially the same as the first heating element shape. The first shielding element may have one of a circular shape, an oval shape, a polygonal shape, a square shape or preferably a rectangular shape.

[0121] The first shielding element has a first shielding element size. The first shielding element size may be any suitable size. The first shielding element size may be different from the first heating element size. Preferably, the first shielding element size is substantially the same as the first heating element size. The first shielding element has a first shielding element length. The first shielding element length may be any suitable length. The first shielding element length may be between about 15 millimeters and about 20 millimeters. The first shielding element has a first shielding element width. The first shielding element width may be any suitable width. The first shielding element width may be between about 10 millimeters and about 15 millimeters. The first shielding element has a first shielding element thickness. The first shielding element thickness may be any suitable thickness. The first shielding element thickness may be between about 0.1 millimeters and about 0.5 millimeters.

[0122] The first shielding element may be formed of any suitable material.

[0123] The first shielding element may be formed of a conductive material. The first shielding element may include a metal or a metal alloy. The first shielding element may include one or more of the following: copper, nickel, silver, silver-aluminum alloy, silver-copper alloy, silver-glass fiber and nickel-graphite alloy. The first shielding element may include a copper alloy. The first shielding element may include nickel silver. In other words, the first shielding element may include an alloy of copper, nickel and zinc. The first shielding element may include copper alloy 770. The first shielding element may include an alloy containing 55 wt% copper, 27 wt% zinc and 18 wt% nickel.

[0124] The first shielding element may include silicon. The first shielding element may include a silicon substrate containing metal particles. The metal particles may include one or more of the following: copper, nickel, silver, silver-aluminum alloy, silver-copper alloy, silver-glass fiber, and nickel-graphite alloy.

[0125] The first shielding element may be formed of a material having a relative magnetic permeability of at least 5, or at least 10, or at least 20, or at least 30, or at least 40, or at least 50, or at least 60, or at least 80, or at least 100 at a frequency between 6 and 8 megahertz (MHz) and a temperature of 25 degrees Celsius. Advantageously, providing the first shielding element with such a relative magnetic permeability can enable the shielding element to shield the exterior of the device and one or more of the other components of the device from any varying magnetic fields generated by the first heating assembly.

[0126] The first shielding element may include a magnetic material. The first shielding element may include at least about 5%, or at least about 20%, or at least about 50%, or at least about 90% ferromagnetic or paramagnetic material by dry weight. The magnetic material of the first shielding element may be a ferromagnetic material such as ferrite, ferritic iron, ferromagnetic alloy, ferromagnetic steel, or ferromagnetic stainless steel, and the ferromagnetic stainless steel may be, for example, SAE 400 series stainless steel, SAE 409, 410, 420, or 430 type stainless steel. Advantageously, forming the first shielding element of a magnetic material can enable the shielding element to shield the exterior of the device and one or more of the other components of the device from any varying magnetic fields generated by the first heating assembly.

[0127] The first shielding element may include a fabric. The first shielding element may include a fabric containing polyester. The first shielding element may include an EMF fabric, sometimes referred to as a Faraday fabric. Suitable commercially available Faraday fabrics include: the Faraday fabric available from NEWBEAU, which contains 20 wt% copper and nickel and 80 wt% polyester; and the Faraday fabric available from COVA, which contains 20 wt% copper and nickel and 80 wt% polyester. Other suitable Faraday fabrics include the TitanRF Faraday fabric available from Mission Darkness, which contains 62 ± 7 wt% polyester fiber, 25 ± 7 wt% copper, and 13 ± 7 wt% nickel; and the protective fabric available from Amradield, which contains polyester, nickel, and copper.

[0128] The first shielding element may include a layered structure. In other words, the first shielding element may include a multi-layer composition of different elements. Each element or layer may be a thin foil. The layered structure may include at least one of the following: a layer including a conductive material, a layer including a magnetic material, a layer including a heat insulating material, and a layer including an electrically insulating material.

[0129] As used herein, "adiabatic" means that when measured using the modified transient plane source (MTPS) method, the material has a volume thermal conductivity of less than about 5 milliwatts per meter kelvin (mW / (mΚ)) at 23 degrees Celsius (°C) and 50% relative humidity.

[0130] As used herein, "electrically insulating" means that the material has a volume resistivity greater than about 1 × 10 6 ohm - meters (Ωm), typically between about 1 × 10 9 ohm - meters (Ωm) and about 1 × 10 21 ohm - meters (Ωm) at 20 degrees Celsius (°C).

[0131] The second heating assembly may further include a second shielding element.

[0132] The second shielding element may be a planar second shielding element that extends substantially in a second plane parallel to the surface of the cavity. The second shielding element may be a flat second shielding element. The second shielding element may be a flat planar shielding element.

[0133] The second shielding element may be disposed in any suitable position. Preferably, the second heating element is disposed between the surface of the cavity and the second shielding element. In the case where the second heating assembly includes a second inductor coil, a second heating element, and a second shielding element, the second inductor coil may be disposed between the second heating element and the second shielding element.

[0134] The second shielding element has a second shielding element shape. The second shielding element shape may be any suitable shape. The second shielding element shape may be different from the second heating element shape. Preferably, the second shielding element shape is substantially the same as the second heating element shape. The second shielding element may have one of a circular shape, an oval shape, a polygonal shape, a square shape, or a preferred rectangular shape.

[0135] The second shielding element has a second shielding element size. The second shielding element size may be any suitable size. The second shielding element size may be different from the second heating element size. Preferably, the second shielding element size is substantially the same as the second heating element size. The second shielding element has a second shielding element length. The second shielding element length may be any suitable length. The second shielding element length may be between about 15 millimeters and about 20 millimeters. The second shielding element has a second shielding element width. The second shielding element width may be any suitable width. The second shielding element width may be between about 10 millimeters and about 15 millimeters. The second shielding element has a second shielding element thickness. The second shielding element thickness may be any suitable thickness. The second shielding element thickness may be between about 0.1 millimeter and about 0.5 millimeter.

[0136] The second shielding element can be formed of any suitable material.

[0137] The second shielding element can be formed of a conductive material. The second shielding element may include a metal or a metal alloy. The second shielding element may include one or more of the following: copper, nickel, silver, silver-aluminum alloy, silver-copper alloy, silver-glass fiber, and nickel-graphite alloy. The second shielding element may include a copper alloy. The second shielding element may include nickel silver. In other words, the second shielding element may include an alloy of copper, nickel, and zinc. The second shielding element may include copper alloy 770. The second shielding element may include an alloy comprising 55 wt% copper, 27 wt% zinc, and 18 wt% nickel.

[0138] The second shielding element may include silicon. The second shielding element may include a silicon substrate containing metal particles. The metal particles may include one or more of the following: copper, nickel, silver, silver-aluminum alloy, silver-copper alloy, silver-glass fiber, and nickel-graphite alloy.

[0139] The second shielding element can be formed of a material having a relative permeability of at least 5, or at least 10, or at least 20, or at least 30, or at least 40, or at least 50, or at least 60, or at least 80, or at least 100 at a frequency between 6 and 8 megahertz (MHz) and a temperature of 25 degrees Celsius. Advantageously, providing a second shielding element having such a relative permeability can enable the shielding element to shield one or more of the exterior of the device and other components of the device from any varying magnetic fields generated by the second heating assembly.

[0140] The second shielding element may include a magnetic material. The second shielding element may include at least about 5%, or at least about 20%, or at least about 50%, or at least about 90% ferromagnetic or paramagnetic material by dry weight. The magnetic material of the second shielding element may be a ferromagnetic material such as ferrite, ferritic iron, ferromagnetic alloy, ferromagnetic steel, or ferromagnetic stainless steel, and the ferromagnetic stainless steel may be, for example, SAE 400 series stainless steel, SAE 409, 410, 420, or 430 type stainless steel. Advantageously, forming the second shielding element of a magnetic material can enable the shielding element to shield one or more of the exterior of the device and other components of the device from any varying magnetic fields generated by the second heating assembly.

[0141] The second shielding element may include a fabric. The second shielding element may include a fabric containing polyester. The second shielding element may include an EMF fabric, sometimes referred to as a Faraday fabric. Suitable commercially available Faraday fabrics include: a Faraday fabric commercially available from NEWBEAU, which contains 20 wt% copper and nickel and 80 wt% polyester; and a Faraday fabric commercially available from COVA, which contains 20 wt% copper and nickel and 80 wt% polyester. Other suitable Faraday fabrics include the TitanRF Faraday fabric commercially available from Mission Darkness, which contains 62 ± 7 wt% polyester fibers, 25 ± 7 wt% copper, and 13 ± 7 wt% nickel; and a protective fabric commercially available from Amradield, which contains polyester, nickel, and copper.

[0142] The second shielding element may include a layered structure. In other words, the second shielding element may include a multi-layer composition of different elements. Each element or layer may be a thin foil. The layered structure may include at least one of the following: a layer including a conductive material, a layer including a magnetic material, a layer including a heat-insulating material, and a layer including an electrically insulating material.

[0143] As used herein, "heat-insulating" means that when measured using the modified transient plane source (MTPS) method, the material has a volume thermal conductivity of less than about 5 milliwatts per meter kelvin (mW / (mΚ)) at 23 degrees Celsius (°C) and 50% relative humidity.

[0144] As used herein, "electrically insulating" means that the material has a volume resistivity greater than about 1×10 6 ohm-meters (Ωm), typically between about 1×10 9 ohm-meters (Ωm) and about 1×10 21 ohm-meters (Ωm).

[0145] The heating chamber is configured to receive an aerosol-forming substrate. In the case where the aerosol-forming substrate is included in the aerosol-generating article, the heating chamber may be configured to receive at least a portion of the aerosol-generating article.

[0146] The heating chamber may be configured to receive a first aerosol-forming substrate and a second aerosol-forming substrate. In the case where the first aerosol-forming substrate and the second aerosol-forming substrate are included in the aerosol-generating article, the heating chamber may be configured to receive the aerosol-generating article.

[0147] The heating chamber may have any suitable form.

[0148] A second portion of the chamber surface may be adjacent to a first portion of the chamber surface. The second portion of the chamber surface may be spaced apart from the first portion of the chamber surface.

[0149] The heating chamber has a cross-sectional shape. The cross-sectional shape of the heating chamber can have any suitable shape. The cross-sectional shape of the heating chamber can be one of circular, oval, polygonal, square or preferably rectangular.

[0150] As used herein, "cross-section" is a section of a feature taken perpendicular to the longitudinal direction of the feature.

[0151] The heating chamber has a heating chamber length. The heating chamber length can be any suitable length. The heating chamber length can be between about 45 millimeters and about 55 millimeters.

[0152] The heating chamber has a heating chamber width. The heating chamber width can be any suitable width. The heating chamber width can be between about 10 millimeters and about 15 millimeters.

[0153] The heating chamber has a heating chamber depth. The heating chamber depth can be any suitable depth. The heating chamber depth can be between about 0.10 millimeters and about 7 millimeters.

[0154] The heating chamber has a proximal end and a distal end. Preferably, the proximal end of the heating chamber is open for receiving the aerosol-forming substrate. Preferably, the distal end of the heating chamber is substantially closed. In some preferred embodiments, the first heating assembly is arranged towards the proximal end of the heating chamber, and the second heating assembly is arranged towards the distal end of the heating chamber.

[0155] In some embodiments, the first heating assembly is arranged at or towards the proximal end of the heating chamber, and the second heating assembly is arranged at or towards the distal end of the heating chamber. In some of these embodiments, the controller can be configured to supply power to the first heating assembly to heat the first heating element before supplying power to the second heating assembly to heat the second heating element. Advantageously, supplying power to the first heating assembly at the proximal end of the heating chamber to heat the first heating element before supplying power to the second heating assembly to heat the second heating element can ensure that the aerosol-forming substrate in the heating chamber to be heated by the second heating assembly is not heated by the vapor when it is drawn through the aerosol-generating article, the vapor being generated by the aerosol-forming substrate heated by the first heating assembly.

[0156] The aerosol-generating device can include at least one air inlet. The at least one air inlet can be arranged such that ambient air can enter the aerosol-generating device. The at least one air inlet can enable ambient air to enter the heating chamber. The at least one air inlet can be arranged at the outer surface of the aerosol-generating device. The at least one air inlet can be arranged at any suitable position in the aerosol-generating device. The at least one air inlet can be arranged at or towards the proximal end of the aerosol-generating device.

[0157] An aerosol generating device may include at least one air outlet. The at least one air outlet may be arranged at the heating chamber. The at least one air outlet may be arranged at any suitable position in the heating chamber. The at least one air outlet may be arranged at the distal end of the heating chamber or towards the distal end of the heating chamber.

[0158] The aerosol generating device may include an air flow path extending between at least one air inlet and at least one air outlet. As used herein, the terms "air flow path", "air path", "air passageway" and "airway" may be used interchangeably to refer to the path through the aerosol generating system or a part of the system along which air flows during use of the aerosol generating system. The air flow path may be configured such that ambient air can flow from the air inlet through the air flow path and exit the air outlet into the heating chamber. The air flow path may include one or more bends. The air flow path may be tortuous. Providing an air flow path, and in particular a tortuous air flow path, for the aerosol generating device may enable accurate control of the draw resistance of the aerosol generating system.

[0159] In some embodiments, the aerosol generating device may include a mouthpiece. The mouthpiece may include a mouthpiece opening. The mouthpiece opening may extend into the heating chamber. The mouthpiece opening may be configured such that air can be drawn out of the heating chamber. The mouthpiece may be arranged at the proximal end of the aerosol generating device. The mouthpiece opening may be arranged at the proximal end of the aerosol generating device.

[0160] The mouthpiece may be coupled to the housing of the aerosol generating device. The mouthpiece may be removable from the housing of the aerosol generating device. The mouthpiece may be movably coupled to the housing of the aerosol generating device. The mouthpiece may be hingedly coupled to the housing of the aerosol generating device.

[0161] The mouthpiece may define the proximal end of the heating chamber.

[0162] The mouthpiece may be made of any suitable material. The mouthpiece may be made of any material suitable for the housing of the aerosol generating device. In some preferred embodiments, the mouthpiece is formed of the same material as the housing of the aerosol generating device.

[0163] In some embodiments, the aerosol generating device includes a heater frame. The heater frame may define a part of the heating chamber. The heater frame may define a heater cavity. The heater frame may provide a structure to which at least one of a heating element and a heating assembly can be mounted. The arrangement of the heater frame to which the heating element and the heating assembly can be mounted may facilitate the manufacture and maintenance of the aerosol generating device.

[0164] The heating element may be mounted to the outer surface of the heater frame. The heating assembly may be mounted to the outer surface of the heater frame. The heating element may be mounted to the inner surface of the heater frame. The heating assembly may be mounted to the inner surface of the heater frame.

[0165] The heater frame can be made of any suitable material. In particular, the heater frame can be formed from any material suitable for the housing of the aerosol-generating device. The heater frame can be formed from the same material as the housing of the aerosol-generating device. In some embodiments, the heater frame 35 can be formed from a material having a high thermal conductivity. This can improve the heat transfer from the heating assembly to the aerosol-generating article, especially in the case where the heating element is mounted to the outer surface of the heater frame. For example, the heater frame can be formed from aluminum. In the case where the heater frame is formed from a conductive material, it may be necessary to electrically insulate the heating element and the heating assembly from the heater frame.

[0166] The aerosol-generating device can have any suitable form. The aerosol-generating device can be planar and extend in a plane. The plane of the aerosol-generating device can be parallel to the plane of the cavity surface. The aerosol-generating device can be flat. The aerosol-generating device can be a flat planar aerosol-generating device.

[0167] The aerosol-generating device can be elongate.

[0168] As used herein, an "elongate" feature is a feature whose length is substantially greater than the other dimensions of the feature. For example, an elongate feature can have a length that is at least three times the other dimensions of the feature.

[0169] The aerosol-generating device has a cross-sectional shape. The aerosol-generating device can have any suitable cross-sectional shape. In some embodiments, the cross-sectional shape of the aerosol-generating device is rectangular or square.

[0170] The aerosol-generating device can have two planar opposing outer surfaces that extend in a plane parallel to the plane of the cavity surface. The two planar opposing outer surfaces can have any suitable shape. The two planar opposing outer surfaces can have a substantially rectangular or square shape.

[0171] The aerosol-generating device can have any suitable size. Preferably, the aerosol-generating device is portable. The aerosol-generating device can be a handheld aerosol-generating device. In other words, the size and shape of the aerosol-generating device can be configured to be held in a user's hand. The aerosol-generating device can have dimensions comparable to a conventional cigar or cigarette. The aerosol-generating device can have a length between approximately 70 millimeters and approximately 120 millimeters.

[0172] The aerosol-generating device has an aerosol-generating device length. The aerosol-generating device length can be any suitable length. The aerosol-generating device length can be between about 30 millimeters and about 150 millimeters, between about 70 millimeters and about 120 millimeters, or preferably between about 100 millimeters and about 110 millimeters.

[0173] The aerosol generating device has an aerosol generating device width. The aerosol generating device width can be any suitable width. The aerosol generating device width can be between about 25 millimeters and about 35 millimeters.

[0174] The aerosol generating device has an aerosol generating device thickness. The aerosol generating device thickness can be any suitable thickness. The aerosol generating device thickness can be between about 20 millimeters and about 30 millimeters.

[0175] The aerosol generating device can include a housing. The housing can define at least a portion of a heating chamber.

[0176] The housing can be planar and extend in a plane. The plane of the housing can be parallel to the plane of the chamber surface. Preferably, the housing is flat. The housing can be a planar flat housing.

[0177] The housing can include any suitable material or combination of materials.

[0178] The housing can be formed of a non-magnetic material.

[0179] As used herein, "non-magnetic material" refers to a material that does not interact with a magnetic field and cannot be heated by the penetration of an alternating magnetic field.

[0180] In some embodiments, the housing is formed of an electrically insulating material.

[0181] As used herein, "adiabatic" means that when measured using the modified transient plane source (MTPS) method, the material has a volume thermal conductivity of less than about 5 milliwatts per meter kelvin (mW / (mΚ)) at 23 degrees Celsius (°C) and 50% relative humidity.

[0182] In some embodiments, the housing is formed of an electrically insulating material.

[0183] As used herein, "electrically insulating" means that the material has a volume resistivity greater than about 1×10 6 ohm-meters (Ωm), typically between about 1×10 9 ohm-meters (Ωm) and about 1×10 21 ohm-meters (Ωm).

[0184] Preferably, the material is lightweight and non-brittle.

[0185] Examples of suitable materials include metals, alloys, plastics, or composite materials containing one or more of those materials, or thermoplastics suitable for food or pharmaceutical applications, such as polypropylene, polyetheretherketone (PEEK), and polyethylene.

[0186] An aerosol generating device may include a power source. The power source may be arranged to supply power to a first heating component. The power source may be arranged to supply power to a second heating component.

[0187] The power source can be any suitable power source. Preferably, the power source is a DC power source. The power source can be a battery. The battery can be a rechargeable battery. The battery can be a lithium-based battery, such as a lithium cobalt battery, a lithium iron phosphate battery, a lithium titanate battery, or a lithium polymer battery. The battery can be a nickel metal hydride battery or a nickel cadmium battery. The power source can be another form of charge storage device, such as a capacitor. The power source can be rechargeable and configured for many charge-discharge cycles. The power source can have a capacity that allows storing enough energy for one or more user experiences of the aerosol generation system; for example, the power source can have enough capacity to allow continuous aerosol generation for about six minutes (corresponding to the typical time taken to smoke a conventional cigarette), or for a time that is a multiple of six minutes. In another example, the power source can have enough capacity to allow a predetermined number of puffs or discontinuous activation of the first and second heating components. The power source can be configured to supply about 5 to about 12 puffs on the aerosol generating device. The power source can be configured to supply about 8 to about 10 puffs on the aerosol generating device.

[0188] The aerosol generating device includes a controller and may include other electronic components. For example, in some embodiments, the controller can include any of the following: a sensor, a switch, and a display element.

[0189] In the case where at least one of the first heating component and the second heating component is an inductive heating component, and where the power source is a DC power source, the aerosol generating device may include a DC / AC converter. The DC / AC converter can be arranged between the DC power source and the inductor coil of the inductive heating component. The DC / AC converter can include a capacitor. The DC / AC converter can include an LC (inductor-capacitor) load network.

[0190] In some preferred embodiments, the DC / AC converter can include a capacitor, where the DC / AC converter further includes an LC (inductor-capacitor) load network, and where the LC load network includes an inductor coil and a capacitor. In some of these preferred embodiments, the inductor coil is connected in series with the capacitor.

[0191] In some preferred embodiments, the DC / AC converter includes a class-E power amplifier. The DC / AC converter can include a class-D power amplifier.

[0192] In some of these embodiments, the power supply circuit may further include a DC / DC converter. The DC / AC converter may be arranged between the DC power supply and the DC / AC converter. The DC / DC converter may enable DC power supplies with different power supply voltages to be used with the aerosol generating device without changing the function of the aerosol generating device.

[0193] The power supply circuit may further include a puff detector. The puff detector may be configured to detect when a user puffs on the aerosol generating device. The puff detector may be any suitable sensor capable of detecting when a user puffs on the aerosol generating device. For example, the puff detector may be an airflow sensor.

[0194] In the case where the power supply circuit includes a puff detector, the controller may be configured to supply power to one or both of the first heating component and the second heating component to heat the aerosol-forming substrate received in the heating chamber when the puff detector detects that the user inhales or puffs on the aerosol generating device.

[0195] According to the present disclosure, there is also provided an aerosol generating system, which includes: the aerosol generating device as described above; and an aerosol-forming substrate.

[0196] The aerosol generating system may be configured to deliver nicotine to a user.

[0197] In some preferred embodiments, the aerosol-forming substrate includes a first aerosol-forming substrate and a second aerosol-forming substrate. The first aerosol-forming substrate may be arranged in the heating chamber at or around a first portion of the chamber surface. The second aerosol-forming substrate may be arranged in the heating chamber at or around a second portion of the chamber surface. Advantageously, arranging the first aerosol-forming substrate at or around a first portion of the chamber surface in the heating chamber and arranging the second aerosol-forming substrate at or around a second portion of the chamber surface in the heating chamber may enable the first aerosol-forming substrate and the second aerosol-forming substrate to be heated separately and selectively by the first heating component and the second heating component, respectively.

[0198] In some embodiments, the second aerosol-forming substrate is formed of the same material as the first aerosol-forming substrate. In some embodiments, the second aerosol-forming substrate is formed of a material different from the first aerosol-forming substrate.

[0199] The aerosol generating system may include an aerosol generating article, and the aerosol generating article includes an aerosol-forming substrate.

[0200] An aerosol-generating article can have any suitable form. The aerosol-generating article can be planar and extend in a plane. The aerosol-generating article can be flat. The aerosol-generating article can be a flat, planar aerosol-generating article.

[0201] The aerosol-generating article can be elongate.

[0202] The aerosol-generating article has a cross-sectional shape. The aerosol-generating article can have any suitable cross-sectional shape. In some embodiments, the cross-sectional shape of the aerosol-generating article is rectangular or square.

[0203] The aerosol-generating article can have two planar and opposite outer surfaces that, when the article is received in a heating chamber, extend in a plane parallel to the plane of the chamber surface. The two planar and opposite outer surfaces can have any suitable shape. The two planar and opposite outer surfaces can have a substantially rectangular or square shape.

[0204] The aerosol-generating article can have any suitable dimensions. The aerosol-generating article has an article length. The article length can be any suitable article length. The article length can be between about 55 millimeters and about 65 millimeters. The aerosol-generating article has an article width. The article width can be any suitable article width. The article width can be between about 10 millimeters and about 15 millimeters. The aerosol-generating article has an article thickness. The article thickness can be any suitable article thickness. The article thickness can be between about 0.10 millimeters and about 7 millimeters.

[0205] The aerosol-generating article can include a housing. The housing can define a matrix chamber. An aerosol-forming matrix can be disposed in the matrix chamber.

[0206] The aerosol-generating article can include at least one air inlet. The at least one air inlet can be arranged such that ambient air can enter the aerosol-generating article. The at least one air inlet can enable ambient air to enter the matrix chamber. The at least one air inlet can be disposed at an outer surface of the aerosol-generating article. The at least one air inlet can be disposed at any suitable location in the aerosol-generating article. The at least one air inlet can be disposed at or towards a distal end of the aerosol-generating article.

[0207] The aerosol-generating article can include at least one air outlet. The at least one air outlet can be disposed at the matrix chamber. The at least one air outlet can be disposed at any suitable location in the matrix chamber. The at least one air outlet can be disposed at or towards a distal end of the matrix chamber.

[0208] An aerosol-generating article may include an airflow path extending between at least one air inlet and at least one air outlet. The airflow path may be configured such that ambient air can flow from the air inlet through the airflow path and exit the air outlet into a substrate cavity. The airflow path may include one or more bends. The airflow path may be tortuous. Providing an airflow path, and in particular a tortuous airflow path, for the aerosol-generating article can enable accurate control of the draw resistance of the aerosol-generating system.

[0209] The housing may be planar and extend in a plane. The plane of the housing may be parallel to the plane of the cavity surface. Preferably, the housing is flat. The housing may be a flat planar housing.

[0210] The aerosol-generating article housing may have an outer surface that extends in a plane. The aerosol-generating system may be configured such that when a portion of the aerosol-generating article is received in the heating cavity, the outer surface is at or adjacent to the plane of the cavity surface. The aerosol-generating system may be configured such that when a portion of the aerosol-generating article is received in the heating cavity, the outer surface is parallel to the plane of the cavity surface.

[0211] Advantageously, positioning the outer surface of the aerosol-generating article at or adjacent to the cavity surface and preferably parallel to the plane of the cavity surface can provide a compact device that enables efficient transfer of heat from the heating assembly to the aerosol-generating article. This is because the housing of the aerosol-generating article is arranged as close as possible to the heating assembly.

[0212] The aerosol-generating article housing may have a first outer surface that extends in a plane and a second outer surface that extends in a plane. The second outer surface may form an outer surface opposite the first outer surface. The aerosol-generating system may be configured such that when a portion of the aerosol-generating article is received in the heating cavity, the first outer surface is at or adjacent to the plane of the first cavity surface and the second outer surface is at or adjacent to the plane of the second cavity surface. The aerosol-generating system may be configured such that when a portion of the aerosol-generating article is received in the heating cavity, the first outer surface is parallel to the plane of the first cavity surface and the second outer surface is parallel to the plane of the second cavity surface.

[0213] The housing may include any suitable material or combination of materials.

[0214] The housing may be formed from a non-magnetic material.

[0215] In some embodiments, the housing is formed from an electrically insulating material.

[0216] In some embodiments, the housing is formed from an electrically insulating material.

[0217] Preferably, the material is lightweight and non-brittle.

[0218] Examples of suitable materials include paper, cardboard, metal, alloy, plastic, or a composite material containing one or more of these materials, or a thermoplastic material suitable for food or pharmaceutical applications, such as polypropylene, polyetheretherketone (PEEK), and polyethylene.

[0219] In the case where the aerosol-generating system includes a first aerosol-forming substrate and a second aerosol-forming substrate, the aerosol-generating system may include an aerosol-generating article that includes the first aerosol-forming substrate and the second aerosol-forming substrate.

[0220] In the case where the aerosol-generating article includes a housing that defines a substrate cavity, the first aerosol-forming substrate may be disposed in the substrate cavity, and the second aerosol-forming substrate may be disposed in the substrate cavity.

[0221] The first aerosol-forming substrate may be spaced apart from the second aerosol-forming substrate. An airflow path may be provided between the first aerosol-forming substrate and the second aerosol-forming substrate. Advantageously, providing an airflow path between the first aerosol-forming substrate and the second aerosol-forming substrate can improve the mixing of the vapor and the aerosol generated by the first aerosol-forming substrate and the second aerosol-forming substrate.

[0222] The aerosol-forming substrate may be a planar aerosol-forming substrate that extends in a plane. The aerosol-generating system may be configured such that when the aerosol-forming substrate is received in the heating cavity, the plane of the aerosol-forming substrate is parallel to the plane of the cavity surface.

[0223] The aerosol-forming substrate may be a flat aerosol-forming substrate. The aerosol-forming substrate may be a flat planar aerosol-forming substrate.

[0224] In the case where the aerosol generating system includes a first aerosol-forming substrate and a second aerosol-forming substrate, the first aerosol-forming substrate may be a planar aerosol-forming substrate extending in a first plane. The aerosol generating system may be configured such that when the first aerosol-forming substrate is received in the heating chamber, the first plane of the aerosol-forming substrate is parallel to the first plane of the first portion of the chamber surface. In the case where the aerosol generating system includes a first aerosol-forming substrate and a second aerosol-forming substrate, the second aerosol-forming substrate may be a planar aerosol-forming substrate extending in a second plane. The aerosol generating system may be configured such that when the second aerosol-forming substrate is received in the heating chamber, the second plane of the aerosol-forming substrate is parallel to the second plane of the second portion of the chamber surface. The second plane of the second planar aerosol-forming substrate may be parallel to the first plane of the first planar aerosol-forming substrate. The second plane of the second planar aerosol-forming substrate may be the first plane of the first planar aerosol-forming substrate.

[0225] The aerosol generating article may include an air inlet. The aerosol generating article may include an air outlet. The aerosol generating article may include an air flow path extending between the air inlet and the air outlet.

[0226] The air flow path in the aerosol generating article may extend across the aerosol-forming substrate. The air flow path in the aerosol generating article may contact the aerosol-forming substrate. The air flow path in the aerosol generating article may extend across one or more sides of the aerosol-forming substrate.

[0227] In some embodiments, the aerosol generating article may be configured such that when the aerosol-forming substrate is received in the heating chamber, the air inlet is not received in the heating chamber.

[0228] In some embodiments, the aerosol generating article may be configured such that when the aerosol-forming substrate is received in the heating chamber, the air inlet is received in the heating chamber. In the case where the aerosol generating device includes an air inlet, the air inlet of the aerosol generating device may be aligned with the air inlet of the aerosol generating article. In the case where the aerosol generating device includes an air outlet, the air outlet of the aerosol generating device may be aligned with the air inlet of the aerosol generating article.

[0229] The aerosol generating article may include a mouthpiece. The mouthpiece may include a mouthpiece opening. The mouthpiece opening may extend into the substrate chamber. The mouthpiece opening may be configured such that air can be drawn out of the substrate chamber. The mouthpiece may be disposed at the proximal end of the aerosol generating article. The mouthpiece opening may be disposed at the proximal end of the aerosol generating article. The aerosol generating article may be configured such that when the aerosol-forming substrate is received in the heating chamber, the mouthpiece is not received in the heating chamber.

[0230] In some embodiments, the aerosol-generating article includes a key. In some of these embodiments, the heating chamber of the aerosol-generating device is configured to receive the key when the aerosol-generating article is inserted into the heating chamber in a particular orientation.

[0231] The aerosol-generating device is configured to receive an aerosol-forming substrate. The aerosol-forming substrate can be any suitable aerosol-forming substrate.

[0232] The aerosol-forming substrate can be a solid aerosol-forming substrate. The aerosol-forming substrate can be a liquid aerosol-forming substrate.

[0233] The aerosol-forming substrate can include tobacco. The aerosol-forming substrate can be a solid aerosol-forming substrate containing tobacco. The aerosol-forming substrate can include a tobacco-containing material that contains volatile tobacco flavor compounds released from the substrate upon heating.

[0234] The solid aerosol-forming substrate can include a tobacco rod. The tobacco rod can include, for example, one or more of the following: powders, granules, pellets, flakes, filaments, strips, or sheets, which contain one or more of the following: herbaceous leaves, tobacco leaves, tobacco ribs, expanded tobacco, and homogenized tobacco. As used herein, "homogenized tobacco material" refers to a material formed by coalescing particulate tobacco. Providing a homogenized tobacco material can improve aerosol generation, nicotine content, and flavor distribution of the aerosol generated during heating of the aerosol-generating article. Specifically, the process of manufacturing homogenized tobacco involves grinding tobacco leaves, which more effectively achieves the release of nicotine and flavor upon heating. In the case where the tobacco rod includes a homogenized tobacco material, the homogenized tobacco material can be in the form of a sheet. As used herein, "sheet" refers to a layered element having a width and a length significantly greater than its thickness.

[0235] The solid aerosol-forming substrate can include a homogenized tobacco material. The solid aerosol-forming material can include fragments, filaments, or strips of a homogenized tobacco material. The solid aerosol-forming substrate can include a sheet of a homogenized tobacco material.

[0236] The sheet of homogenized tobacco material can be formed by coalescing particulate tobacco obtained by grinding or otherwise comminuting one or both of tobacco leaves and tobacco stems. The sheet of homogenized tobacco material can include one or more of the following: tobacco dust, tobacco fines, and other particulate tobacco by-products formed, for example, during the handling, processing, and transportation of tobacco. The sheet of homogenized tobacco material is preferably formed by a casting process of the following type, which generally includes: casting a slurry containing particulate tobacco and one or more binders onto a conveyor belt or other support surface; drying the cast slurry to form a sheet of homogenized tobacco material; and removing the sheet of homogenized tobacco material from the support surface.

[0237] The solid aerosol-forming substrate may comprise an agglomerated sheet of homogenized tobacco material. As used herein, "agglomerated" is used to describe the winding, folding, or otherwise compressing or shrinking of the sheet substantially transverse to the longitudinal axis of the aerosol-generating article.

[0238] In some preferred embodiments, the aerosol-forming substrate comprises an agglomerated textured sheet of homogenized tobacco material. As used herein, "textured sheet" means a sheet that has been curled, embossed, debossed, perforated, or otherwise deformed. The use of a textured sheet of homogenized tobacco material can advantageously facilitate the agglomeration of the sheets of homogenized tobacco material to form the aerosol-forming substrate. The aerosol-forming substrate may comprise an agglomerated textured sheet of homogenized tobacco material that includes a plurality of spaced-apart notches, protrusions, perforations, or combinations thereof.

[0239] In particularly preferred embodiments, the aerosol-forming substrate comprises an agglomerated curled sheet of homogenized tobacco material. As used herein, "curled sheet" means a sheet having a plurality of substantially parallel ridges or wrinkles. Preferably, the substantially parallel ridges or wrinkles extend along or parallel to the longitudinal axis of the aerosol-generating article. This advantageously facilitates the agglomeration of the curled sheets of homogenized tobacco material to form the aerosol-generating article. However, it should be understood that the curled sheets of homogenized tobacco material for inclusion in the aerosol-generating article may alternatively or additionally have a plurality of substantially parallel ridges or wrinkles that are disposed at an acute or obtuse angle relative to the longitudinal axis of the aerosol-generating article.

[0240] The aerosol-forming substrate may comprise tobacco-containing material and tobacco-free material.

[0241] The aerosol - forming substrate may include an aerosol - forming agent. The aerosol - forming substrate may include a single aerosol - forming agent or a combination of two or more aerosol - forming agents. As used herein, the term "aerosol - forming agent" is used to describe any suitable known compound or mixture of compounds that facilitates the formation of an aerosol in use and is substantially thermally stable against degradation at the operating temperature of the aerosol - generating article. Suitable aerosol - forming agents include, but are not limited to: polyols such as propylene glycol, triethylene glycol, 1,3 - butanediol, and glycerol; esters of polyols such as glycerol mono -, di - or tri - acetate; and aliphatic esters of mono -, di - or poly - carboxylic acids such as dimethyl dodecanedioate and dimethyl tetradecanedioate. Preferred aerosol - forming agents are polyols or mixtures thereof, such as propylene glycol, triethylene glycol, 1,3 - butanediol, and most preferably glycerol. The aerosol - forming substrate may have an aerosol - forming agent content of greater than 5% by dry weight. The aerosol - forming substrate may have an aerosol - forming agent content between about 5% and about 30% by dry weight. The aerosol - forming substrate may have an aerosol - forming agent content of about 20% by dry weight.

[0242] The aerosol - forming substrate preferably includes homogenized tobacco material, an aerosol - forming agent, and water.

[0243] The homogenized tobacco material may be provided in sheets, which are one of the following: folded, curled, or cut into strips. In a particularly preferred embodiment, the sheets are cut into strips having a width between about 0.2 mm and about 2 mm, more preferably between about 0.4 mm and about 1.2 mm. In one embodiment, the width of the strip is about 0.9 mm.

[0244] In some embodiments, the aerosol - forming substrate is a gel. Advantageously, the gel is a solid at room temperature. As used herein, "solid gel" refers to a gel having a stable size and shape and not flowing at room temperature. As used herein, "room temperature" refers to 25 degrees Celsius.

[0245] In the case where the aerosol - forming substrate is a gel, advantageously, the gel may be a thermoreversible gel. This means that the gel becomes a fluid when heated to the melting temperature and becomes a gel again at the gelling temperature. Preferably, the gelling temperature is at or above room temperature and atmospheric pressure. Atmospheric pressure means 1 atmospheric pressure. Preferably, the melting temperature is higher than the gelling temperature. Preferably, the melting temperature of the gel is higher than 50 degrees Celsius or 60 degrees Celsius or 70 degrees Celsius, and more preferably higher than 80 degrees Celsius. The melting temperature in this context means the temperature at which the gel is no longer a solid and begins to flow. The gel may include a gelling agent. Preferably, the gel includes agar or agarose or sodium alginate. The gel may include gellan gum. The gel may include a mixture of materials. The gel may include water.

[0246] The gel may be provided as a single block or may be provided as multiple gel elements, such as beads or capsules. The use of capsules or beads may allow the user to see when the cartridge has been used, since the gel does not form the same capsules or beads upon gelation after heating and subsequent cooling.

[0247] The gel may comprise nicotine or a tobacco product or another target compound for delivery to the user. When the resulting aerosol contains nicotine, it is advantageous for the nicotine to be contained in the gel or in another solid form rather than in liquid form in the substrate container. Nicotine may be included in the gel with an aerosol former. Nicotine is irritating to the skin and may be toxic. Therefore, it is desirable to prevent any possible leakage of nicotine by locking the nicotine in the gel at room temperature.

[0248] When agar is used as the gelling agent, the gel preferably comprises between 0.5 and 5 wt% (and more preferably between 0.8 and 1 wt%) of agar. The gel may also comprise between 0.1 and 2 wt% of nicotine. The gel may also comprise between 30 wt% and 90 wt% (and more preferably between 70 and 90 wt%) of glycerol. The remainder of the gel may comprise water and any flavorings.

[0249] When gellan gum is used as the gelling agent, the gel preferably comprises between 0.5 and 5 wt% of gellan gum. The gel may also comprise between 0.1 and 2 wt% of nicotine. The gel may also comprise between 30 wt% and 99.4 wt% of glycerol. The remainder of the gel may comprise water and any flavorings.

[0250] In one embodiment, the gel comprises 2 wt% of nicotine, 70 wt% of glycerol, 27 wt% of water and 1 wt% of agar. In another embodiment, the gel comprises 65 wt% of glycerol, 20 wt% of water, 14.3 wt% of tobacco and 0.7 wt% of agar.

[0251] The invention is defined in the claims. However, a non-exhaustive list of non-limiting examples is provided below. 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.

[0252] 1. An aerosol generating device, the aerosol generating device comprising:

[0253] A heating chamber configured to receive an aerosol-forming substrate, the heating chamber being defined at one side by a planar chamber surface extending substantially in a plane;

[0254] A first heating assembly, the first heating assembly comprising a planar first heating element extending substantially in a first plane parallel to the plane of the chamber surface; and

[0255] A second heating assembly, the second heating assembly including a planar second heating element, the planar second heating element extending substantially in a second plane parallel to the plane of the cavity surface,

[0256] wherein optionally, the first heating element is arranged at or around or forms a first part of the cavity surface; and

[0257] wherein optionally, the second heating element is arranged at or around or forms a second part of the cavity surface.

[0258] 2. The aerosol generating device according to example Ex1, further comprising a controller.

[0259] 3. The aerosol generating device according to example Ex2, wherein the controller is configured to control the power supply to the first heating assembly to heat the first heating element, and wherein the controller is configured to control the power supply to the second heating assembly to heat the second heating element, and optionally, wherein the aerosol generating device includes a user interface having a first user input configured to enable a user to selectively control the power supply to the first heating assembly; and a second user input configured to enable a user to selectively control the power supply to the second heating assembly.

[0260] 4. The aerosol generating device according to example Ex3, wherein the controller is configured to control the power supply to the first heating assembly to heat the first heating element to a first operating temperature, and wherein the controller is configured to control the power supply to the second heating assembly to heat the second heating element to a second operating temperature, the second operating temperature being different from the first operating temperature.

[0261] 5. The aerosol generating device according to example Ex3 or Ex4, wherein the controller is configured to control the power supply to the first heating assembly to heat the first heating element to a first operating temperature of at least about 100 degrees Celsius, or at least about 200 degrees Celsius, or not exceeding about 350 degrees Celsius, or not exceeding about 280 degrees Celsius, or between about 100 degrees Celsius and about 350 degrees Celsius, or between about 200 degrees Celsius and about 280 degrees Celsius.

[0262] 6. The aerosol generating device according to any one of Examples Ex3 to Ex5, wherein the controller is configured to control the power supply to the second heating assembly to heat the second heating element to a second operating temperature of at least about 100 degrees Celsius, or at least about 200 degrees Celsius, or not exceeding about 350 degrees Celsius, or not exceeding about 280 degrees Celsius, or between about 100 degrees Celsius and about 350 degrees Celsius, or between about 200 degrees Celsius and about 280 degrees Celsius.

[0263] 7. The aerosol generating device according to any one of Examples Ex3 to Ex6, wherein the controller is configured to control the power supply to the second heating assembly independently of the power supply to the first heating assembly.

[0264] 8. The aerosol generating device according to any one of Examples Ex3 to Ex7, wherein the controller is configured to control the power supply to the first heating assembly and the power supply to the second heating assembly such that power is supplied to the first heating assembly and the second heating assembly simultaneously, or such that power is supplied only to the first heating assembly, or such that power is supplied only to the second heating assembly.

[0265] 9. The aerosol generating device according to any one of Examples Ex1 to Ex8, further comprising an aerosol - forming substrate detector.

[0266] 10. The aerosol generating device according to any one of Examples Ex1 to Ex9, wherein:

[0267] The cavity surface is a first cavity surface;

[0268] The heating cavity is further defined at a second cavity surface opposite the first cavity surface;

[0269] A first aerosol - forming substrate detector is disposed at or around a first portion of the second cavity surface opposite a first portion of the first cavity surface; and

[0270] A second aerosol - forming substrate detector is disposed at or around a second portion of the second cavity surface opposite a second portion of the first cavity surface.

[0271] 11. The aerosol generating device according to any one of Examples Ex3 to Ex8, further comprising an aerosol - forming substrate detector.

[0272] 12. The aerosol-generating device according to Example Ex11, wherein the controller is configured to control the power supply to the first heating component based on a signal received from the aerosol-forming substrate detector, and wherein the controller is configured to control the power supply to the second heating component based on a signal received from the aerosol-forming substrate detector.

[0273] 13. The aerosol-generating device according to any one of Examples Ex3 to Ex8, wherein:

[0274] The chamber surface is a first chamber surface;

[0275] The heating chamber is further defined at a second chamber surface opposite the first chamber surface;

[0276] A first aerosol-forming substrate detector is arranged at or around a first part of the second chamber surface opposite a first part of the first chamber surface; and

[0277] A second aerosol-forming substrate detector is arranged at or around a second part of the second chamber surface opposite a second part of the first chamber surface.

[0278] 14. The aerosol-generating device according to Example Ex13, wherein the controller is configured to control the power supply to the first heating component based on a signal received from the first aerosol-forming substrate detector, and wherein the controller is configured to control the power supply to the second heating component based on a signal received from the second aerosol-forming substrate detector.

[0279] 15. The aerosol-generating device according to any one of Examples Ex1 to Ex14, wherein the second heating element is substantially the same as the first heating element.

[0280] 16. The aerosol-generating device according to any one of Examples Ex1 to Ex15, wherein the first heating element has a first heating element shape, the second heating element has a second heating element shape, and the second heating element shape is substantially the same as the first heating element shape.

[0281] 17. The aerosol-generating device according to any one of Examples Ex1 to Ex14, wherein the first heating element has a first heating element shape, the second heating element has a second heating element shape, and the second heating element shape is different from the first heating element shape.

[0282] 18. The aerosol generating device according to Example Ex16 or Ex17, wherein the shape of the first heating element is one of circular, oval, polygonal, square, or preferably rectangular.

[0283] 19. The aerosol generating device according to any one of Examples Ex16 to Ex18, wherein the shape of the second heating element is one of circular, oval, polygonal, square, or preferably rectangular.

[0284] 20. The aerosol generating device according to any one of Examples Ex1 to Ex19, wherein the first heating element has a first heating element size, the second heating element has a second heating element size, and the second heating element size is substantially the same as the first heating element size.

[0285] 21. The aerosol generating device according to any one of Examples Ex1 to Ex14 or Ex16 to Ex19, wherein the first heating element has a first heating element size, the second heating element has a second heating element size, and the second heating element size is different from the first heating element size.

[0286] 22. The aerosol generating device according to any one of Examples Ex1 to Ex21, wherein the first heating element has a first heating element length, and wherein the first heating element length is between about 15 millimeters and about 20 millimeters.

[0287] 23. The aerosol generating device according to any one of Examples Ex1 to Ex22, wherein the first heating element has a first heating element width, and wherein the first heating element width is between about 10 millimeters and about 15 millimeters.

[0288] 24. The aerosol generating device according to any one of Examples Ex1 to Ex23, wherein the first heating element has a first heating element thickness, and wherein the first heating element thickness is between about 0.1 millimeters and about 0.5 millimeters.

[0289] 25. The aerosol generating device according to any one of Examples Ex1 to Ex24, wherein the second heating element has a second heating element length, and wherein the second heating element length is between about 15 millimeters and about 20 millimeters.

[0290] 26. The aerosol generating device according to any one of Examples Ex1 to Ex25, wherein the second heating element has a second heating element width, and wherein the second heating element width is between about 10 millimeters and about 15 millimeters.

[0291] 27. An aerosol-generating device according to any one of Examples Ex1 to Ex26, wherein the second heating element has a second heating element thickness, and wherein the second heating element thickness is between about 0.1 millimeters and about 0.5 millimeters.

[0292] 28. An aerosol-generating device according to any one of Examples Ex1 to Ex27, wherein the first heating element and the second heating element are formed of the same material.

[0293] 29. An aerosol-generating device according to any one of Examples Ex1 to Ex14 or Ex16 to Ex27, wherein the second heating element is formed of a material different from the first heating element.

[0294] 30. An aerosol-generating device according to any one of Examples Ex1 to Ex29, wherein the first heating element is formed of at least one of the following: graphite, molybdenum, silicon carbide, metal, stainless steel, niobium, aluminum, nickel, titanium, and a composite of metallic materials.

[0295] 31. An aerosol-generating device according to any one of Examples Ex1 to Ex30, wherein the second heating element is formed of at least one of the following: graphite, molybdenum, silicon carbide, metal, stainless steel, niobium, aluminum, nickel, titanium, and a composite of metallic materials.

[0296] 32. An aerosol-generating device according to any one of Examples Ex1 to Ex31, wherein the first heating assembly further includes a first inductor coil.

[0297] 33. The aerosol-generating device according to Example Ex32, wherein the first inductor coil is a planar first inductor coil extending substantially in a first plane parallel to the surface of the cavity.

[0298] 34. The aerosol-generating device according to Example Ex32 or Ex33, wherein the first heating element is disposed between the surface of the cavity and the first inductor coil.

[0299] 35. The aerosol-generating device according to any one of Examples Ex32 to Ex34, wherein the first inductor coil has a first inductor coil shape, the first heating element has a first heating element shape, and the first inductor coil shape is substantially the same as the first heating element shape.

[0300] 36. The aerosol-generating device according to any one of Examples Ex32 to Ex35, wherein the first inductor coil has one of a circular shape, an oval shape, a polygonal shape, a square shape, or preferably a rectangular shape.

[0301] 37. An aerosol-generating device according to any one of Examples Ex32 to Ex36, wherein the first inductor coil has a first inductor coil size, the first heating element has a first heating element size, and the first inductor coil size is substantially the same as the first heating element size.

[0302] 38. An aerosol-generating device according to any one of Examples Ex32 to Ex37, wherein the first inductor coil has a first inductor coil length, and wherein the first inductor coil length is between about 15 millimeters and about 20 millimeters.

[0303] 39. An aerosol-generating device according to any one of Examples Ex32 to Ex38, wherein the first inductor coil has a first inductor coil width, and wherein the first inductor coil width is between about 10 millimeters and about 15 millimeters.

[0304] 40. An aerosol-generating device according to any one of Examples Ex32 to Ex39, wherein the first inductor coil has a first inductor coil thickness, and wherein the first inductor coil thickness is between about 0.1 millimeter and about 0.5 millimeter.

[0305] 41. An aerosol-generating device according to any one of Examples Ex32 to Ex40, wherein the first inductor coil is formed of at least one of: silver, gold, aluminum, brass, zinc, iron, nickel, and alloys thereof, and conductive ceramics (such as yttrium-doped zirconia, indium tin oxide, and yttrium-doped titanate).

[0306] 42. An aerosol-generating device according to any one of Examples Ex32 to Ex41, wherein the planar first heating element is a planar first receptor element.

[0307] 43. An aerosol-generating device according to Example Ex42, wherein the first inductor coil generates a first varying magnetic field when a first varying current is supplied to the first inductor coil, and wherein the first receptor element is arranged to be penetrated by the first varying magnetic field generated by the first inductor coil.

[0308] 44. An aerosol-generating device according to Example Ex42 or Ex43, wherein the first receptor element comprises a magnetic material that can be heated by being penetrated by a varying magnetic field, and optionally, wherein the first receptor element comprises at least about 5%, or at least about 20%, or at least about 50%, or at least about 90% ferromagnetic or paramagnetic material by dry weight.

[0309] 45. The aerosol generating device according to Example Ex44, wherein the magnetic material may be a ferromagnetic material, such as ferrite, ferritic iron, ferromagnetic alloy, ferromagnetic steel, or ferromagnetic stainless steel, and the ferromagnetic stainless steel is, for example, SAE 400 series stainless steel, SAE 409, 410, 420, or 430 type stainless steel.

[0310] 46. The aerosol generating device according to any one of Examples Ex42 to Ex45, wherein the first inductor coil has a first inductor coil shape, the first sensor element has a first sensor element shape, and the first sensor element shape is substantially the same as the first inductor coil shape.

[0311] 47. The aerosol generating device according to any one of Examples Ex42 to Ex46, wherein the first inductor coil has a first inductor coil size, the first sensor element has a first sensor element size, and the first sensor element size is substantially the same as the first inductor coil size.

[0312] 48. The aerosol generating device according to any one of Examples Ex1 to Ex41, wherein the first heating element is a resistive heating element.

[0313] 49. The aerosol generating device according to any one of Examples Ex1 to Ex48, wherein the second heating assembly further includes a second inductor coil.

[0314] 50. The aerosol generating device according to Example Ex49, wherein the second inductor coil is a planar second inductor coil extending substantially in a second plane parallel to the surface of the cavity.

[0315] 51. The aerosol generating device according to Example Ex49 or Ex50, wherein the second heating element is disposed between the surface of the cavity and the second inductor coil.

[0316] 52. The aerosol generating device according to any one of Examples Ex49 to Ex51, wherein the second inductor coil has a second inductor coil shape, the second heating element has a second heating element shape, and the second inductor coil shape is substantially the same as the second heating element shape.

[0317] 53. The aerosol generating device according to any one of Examples Ex49 to Ex52, wherein the second inductor coil has one of a circular shape, an oval shape, a polygonal shape, a square shape, or preferably a rectangular shape.

[0318] 54. An aerosol-generating device according to any one of Examples Ex49 to Ex53, wherein the second inductor coil has a second inductor coil size, the second heating element has a second heating element size, and the second inductor coil size is substantially the same as the second heating element size.

[0319] 55. An aerosol-generating device according to any one of Examples Ex49 to Ex54, wherein the second inductor coil has a second inductor coil length, and wherein the second inductor coil length is between about 15 millimeters and about 20 millimeters.

[0320] 56. An aerosol-generating device according to any one of Examples Ex49 to Ex55, wherein the second inductor coil has a second inductor coil width, and wherein the second inductor coil width is between about 10 millimeters and about 15 millimeters.

[0321] 57. An aerosol-generating device according to any one of Examples Ex49 to Ex56, wherein the second inductor coil has a second inductor coil thickness, and wherein the second inductor coil thickness is between about 0.1 millimeter and about 0.5 millimeter.

[0322] 58. An aerosol-generating device according to any one of Examples Ex49 to Ex57, wherein the second inductor coil is formed of at least one of: silver, gold, aluminum, brass, zinc, iron, nickel, and alloys thereof, and conductive ceramics (such as yttrium-doped zirconia, indium tin oxide, and yttrium-doped titanates).

[0323] 59. An aerosol-generating device according to any one of Examples Ex49 to Ex58, wherein the planar second heating element is a planar second receptor element.

[0324] 60. The aerosol-generating device according to Example Ex59, wherein the second inductor coil generates a second varying magnetic field when a second varying current is supplied to the second inductor coil, and wherein the second receptor element is arranged to be penetrated by the second varying magnetic field generated by the second inductor coil.

[0325] 61. The aerosol-generating device according to Example Ex59 or Ex60, wherein the second receptor element comprises a magnetic material that can be heated by being penetrated by a varying magnetic field, and optionally, wherein the second receptor element comprises at least about 5%, or at least about 20%, or at least about 50%, or at least about 90% ferromagnetic or paramagnetic material by dry weight.

[0326] 62. The aerosol generating device according to Example Ex61, wherein the magnetic material may be a ferromagnetic material, such as ferrite, ferritic iron, ferromagnetic alloy, ferromagnetic steel or ferromagnetic stainless steel, and the ferromagnetic stainless steel is, for example, SAE 400 series stainless steel, SAE 409, 410, 420 or 430 type stainless steel.

[0327] 63. The aerosol generating device according to any one of Examples Ex59 to Ex62, wherein the second inductor coil has a second inductor coil shape, the second receptor element has a second receptor element shape, and the second receptor element shape is substantially the same as the second inductor coil shape.

[0328] 64. The aerosol generating device according to any one of Examples Ex59 to Ex63, wherein the second inductor coil has a second inductor coil size, the second receptor element has a second receptor element size, and the second receptor element size is substantially the same as the second inductor coil size.

[0329] 65. The aerosol generating device according to any one of Examples Ex1 to Ex58, wherein the second heating element is a resistive heating element.

[0330] 66. The aerosol generating device according to any one of Examples Ex1 to Ex65, wherein the first heating assembly further includes a first shielding element.

[0331] 67. The aerosol generating device according to Example Ex66, wherein the first shielding element is a planar first shielding element that extends substantially in the first plane parallel to the surface of the cavity.

[0332] 68. The aerosol generating device according to Example Ex66 or Ex67, wherein the first heating element is disposed between the surface of the cavity and the first shielding element.

[0333] 69. The aerosol generating device according to any one of Examples Ex66 to Ex68, wherein the first shielding element has a first shielding element shape, the first heating element has a first heating element shape, and the first shielding element shape is substantially the same as the first heating element shape.

[0334] 70. The aerosol generating device according to any one of Examples Ex66 to Ex69, wherein the first shielding element has one of a circular shape, an oval shape, a polygonal shape, a square shape or preferably a rectangular shape.

[0335] 71. An aerosol-generating device according to any one of Examples Ex66 to Ex70, wherein the first shielding element has a first shielding element size, the first heating element has a first heating element size, and the first shielding element size is substantially the same as the first heating element size.

[0336] 72. An aerosol-generating device according to any one of Examples Ex66 to Ex71, wherein the first shielding element has a first shielding element length, and wherein the first shielding element length is between about 15 millimeters and about 20 millimeters.

[0337] 73. An aerosol-generating device according to any one of Examples Ex66 to Ex72, wherein the first shielding element has a first shielding element width, and wherein the first shielding element width is between about 10 millimeters and about 15 millimeters.

[0338] 74. An aerosol-generating device according to any one of Examples Ex66 to Ex73, wherein the first shielding element has a first shielding element thickness, and wherein the first shielding element thickness is between about 0.1 millimeters and about 0.5 millimeters.

[0339] 75. An aerosol-generating device according to any one of Examples Ex66 to Ex74, wherein the first shielding element is formed of a material having a relative magnetic permeability of at least 5, or at least 10, or at least 20, or at least 30, or at least 40, or at least 50, or at least 60, or at least 80, or at least 100 at a frequency between 6 and 8 megahertz (MHz) and a temperature of 25 degrees Celsius.

[0340] 76. An aerosol-generating device according to Examples Ex66 to Ex75, wherein the first shielding element comprises a magnetic material, and optionally, wherein the first shielding element comprises at least about 5%, or at least about 20%, or at least about 50%, or at least about 90% ferromagnetic or paramagnetic material by dry weight.

[0341] 78. An aerosol-generating device according to Example Ex76, wherein the magnetic material may be a ferromagnetic material such as ferrite, ferritic iron, ferromagnetic alloy, ferromagnetic steel or ferromagnetic stainless steel, and ferromagnetic stainless steel such as SAE 400 series stainless steel, SAE 409, 410, 420 or 430 type stainless steel.

[0342] 79. An aerosol-generating device according to any one of Examples Ex1 to Ex78, wherein the second heating assembly further comprises a second shielding element.

[0343] 80. The aerosol generating device according to Example Ex79, wherein the second shielding element is a planar second shielding element extending substantially in a second plane parallel to the plane of the cavity surface.

[0344] 81. The aerosol generating device according to Example Ex79 or Ex80, wherein the second heating element is arranged between the cavity surface and the second shielding element.

[0345] 82. The aerosol generating device according to any one of Examples Ex79 to Ex81, wherein the second shielding element has a second shielding element shape, the second heating element has a second heating element shape, and the second shielding element shape is substantially the same as the second heating element shape.

[0346] 83. The aerosol generating device according to any one of Examples Ex79 to Ex82, wherein the second shielding element has one of a circular shape, an oval shape, a polygonal shape, a square shape, or preferably a rectangular shape.

[0347] 84. The aerosol generating device according to any one of Examples Ex79 to Ex83, wherein the second shielding element has a second shielding element size, the second heating element has a second heating element size, and the second shielding element size is substantially the same as the second heating element size.

[0348] 85. The aerosol generating device according to any one of Examples Ex79 to Ex84, wherein the second shielding element has a second shielding element length, and wherein the second shielding element length is between about 15 millimeters and about 20 millimeters.

[0349] 86. The aerosol generating device according to any one of Examples Ex79 to Ex85, wherein the second shielding element has a second shielding element width, and wherein the second shielding element width is between about 10 millimeters and about 15 millimeters.

[0350] 87. The aerosol generating device according to any one of Examples Ex79 to Ex86, wherein the second shielding element has a second shielding element thickness, and wherein the second shielding element thickness is between about 0.1 millimeters and about 0.5 millimeters.

[0351] 88. The aerosol generating device according to any one of Examples Ex79 to Ex87, wherein the second shielding element is formed of a material having a relative magnetic permeability of at least 5, or at least 10, or at least 20, or at least 30, or at least 40, or at least 50, or at least 60, or at least 80, or at least 100 at a frequency between 6 and 8 megahertz (MHz) and a temperature of 25 degrees Celsius.

[0352] 89. The aerosol generating device according to Examples Ex79 to Ex88, wherein the second shielding element comprises a magnetic material, and optionally, wherein the second shielding element comprises at least about 5%, or at least about 20%, or at least about 50%, or at least about 90% ferromagnetic or paramagnetic material by dry weight.

[0353] 90. The aerosol generating device according to Example Ex89, wherein the magnetic material may be a ferromagnetic material, such as ferrite, ferritic iron, ferromagnetic alloy, ferromagnetic steel or ferromagnetic stainless steel, and the ferromagnetic stainless steel is, for example, SAE 400 series stainless steel, SAE 409, 410, 420 or 430 type stainless steel.

[0354] 91. The aerosol generating device according to any one of Examples Ex1 to Ex90, wherein the second part of the cavity surface is adjacent to the first part of the cavity surface.

[0355] 92. The aerosol generating device according to any one of Examples Ex1 to Ex90, wherein the second part of the cavity surface is spaced apart from the first part of the cavity surface.

[0356] 93. The aerosol generating device according to any one of Examples Ex1 to Ex92, wherein the cross-sectional shape of the heating cavity is one of circular, elliptical, polygonal, square or preferably rectangular.

[0357] 94. The aerosol generating device according to any one of Examples Ex1 to Ex93, wherein the heating cavity has a heating cavity length, and wherein the heating cavity length is between about 45 millimeters and about 55 millimeters.

[0358] 95. The aerosol generating device according to any one of Examples Ex1 to Ex94, wherein the heating cavity has a heating cavity width, and wherein the heating cavity width is between about 10 millimeters and about 15 millimeters.

[0359] 96. The aerosol generating device according to any one of Examples Ex1 to Ex95, wherein the heating cavity has a heating cavity depth, and wherein the heating cavity depth is between about 0.10 millimeters and about 7 millimeters.

[0360] 97. The aerosol generating device according to any one of Examples Ex1 to Ex96, wherein the heating cavity has a proximal end and a distal end.

[0361] 98. The aerosol generating device according to Example Ex97, wherein the proximal end of the heating cavity is open for receiving the aerosol-forming substrate.

[0362] 99. The aerosol-generating device according to Example Ex97 or Ex98, wherein the distal end of the heating chamber is substantially enclosed.

[0363] 100. The aerosol-generating device according to any one of Examples Ex97 to Ex99, wherein the first heating assembly is arranged towards the proximal end of the heating chamber, and the second heating assembly is arranged towards the distal end of the heating chamber.

[0364] 101. The aerosol-generating device according to any one of Examples Ex1 to Ex100, further comprising at least one air inlet, and optionally, wherein the at least one air inlet is arranged at an outer surface of the aerosol-generating device.

[0365] 102. The aerosol-generating device according to Example Ex101, wherein the at least one air inlet is arranged such that ambient air can enter the aerosol-generating device.

[0366] 103. The aerosol-generating device according to Example Ex101 or Ex102, further comprising an air flow path extending between the at least one air inlet and the air outlet.

[0367] 104. The aerosol-generating device according to Example Ex103, wherein the air outlet is arranged in the heating chamber such that ambient air can flow from the air inlet through the air flow path and exit the air outlet and enter the heating chamber, and optionally, wherein the air outlet is arranged at or towards the distal end of the heating chamber.

[0368] 105. The aerosol-generating device according to Example Ex101, wherein at least one of the at least one air inlets is arranged such that ambient air can enter the heating chamber.

[0369] 106. The aerosol-generating device according to any one of Examples Ex101 to Ex105, wherein the at least one air inlet is arranged at or towards the proximal end of the aerosol-generating device.

[0370] 107. The aerosol-generating device according to any one of Examples Ex1 to Ex106, wherein the aerosol-generating device comprises a housing, and optionally, wherein the housing defines the heating chamber.

[0371] 108. The aerosol-generating device according to Example Ex107, wherein the housing is formed of at least one of the following: metal, metal alloy, plastic material, or a composite material containing one or more of these materials.

[0372] 109. An aerosol-generating device according to any one of Examples Ex1 to Ex108, wherein the aerosol-generating device has an aerosol-generating device length, and wherein the aerosol-generating device length is between about 100 millimeters and about 110 millimeters.

[0373] 110. An aerosol-generating device according to any one of Examples Ex1 to Ex109, wherein the aerosol-generating device has an aerosol-generating device width, and wherein the aerosol-generating device width is between about 25 millimeters and about 35 millimeters.

[0374] 111. An aerosol-generating device according to any one of Examples Ex1 to Ex110, wherein the aerosol-generating device has an aerosol-generating device thickness, and wherein the aerosol-generating device thickness is between about 20 millimeters and about 30 millimeters.

[0375] 112. An aerosol-generating device according to any one of Examples Ex1 to Ex111, further comprising a power source arranged to supply power to the first heating assembly and the second heating assembly, and optionally, wherein the power source is a DC power source, such as a rechargeable battery.

[0376] 113. The aerosol-generating device according to Example Ex112, wherein the power source is configured to supply from about 5 draws to about 12 draws on the aerosol-generating device, and optionally, from about 8 draws to about 10 draws on the aerosol-generating device.

[0377] 114. An aerosol-generating system, comprising:

[0378] an aerosol-generating device according to any one of Examples Ex1 and Ex113; and

[0379] an aerosol-forming substrate.

[0380] 115. The aerosol-generating system according to Example Ex114, wherein the aerosol-forming substrate comprises a first aerosol-forming substrate and a second aerosol-forming substrate.

[0381] 116. The aerosol-generating system according to Example Ex115, wherein the first aerosol-forming substrate is arranged in the heating chamber at or around a first portion of the chamber surface; and wherein the second aerosol-forming substrate is arranged in the heating chamber at or around a second portion of the chamber surface.

[0382] 117. The aerosol-generating system according to Example Ex115 or Ex116, wherein the second aerosol-forming substrate is formed of a material different from the first aerosol-forming substrate.

[0383] 118. An aerosol-generating system according to any one of Examples Ex114 to Ex117, comprising an aerosol-generating article, the aerosol-generating article comprising the aerosol-forming substrate.

[0384] 119. An aerosol-generating system according to any one of Examples Ex115 to Ex117, comprising an aerosol-generating article, the aerosol-generating article comprising the first aerosol-forming substrate and the second aerosol-forming substrate.

[0385] 120. An aerosol-generating system according to Example Ex119, wherein the first aerosol-forming substrate is spaced apart from the second aerosol-forming substrate, and optionally, wherein an air flow path is provided between the first aerosol-forming substrate and the second aerosol-forming substrate.

[0386] 121. An aerosol-generating system according to Example Ex118, wherein the aerosol-forming substrate is a planar aerosol-forming substrate extending in a plane, and optionally, wherein the aerosol-generating system is configured such that when the aerosol-forming substrate is received in the heating chamber, the plane of the aerosol-forming substrate is parallel to the plane of the surface of the chamber.

[0387] 122. An aerosol-generating system according to Example Ex119 or Ex120, wherein at least one of the following holds:

[0388] The first aerosol-forming substrate is a planar aerosol-forming substrate extending in a first plane, and optionally wherein the aerosol-generating system is configured such that when the first aerosol-forming substrate is received in the heating chamber, the first plane of the aerosol-forming substrate is parallel to the first plane of the first part of the surface of the chamber; and

[0389] The second aerosol-forming substrate is a planar aerosol-forming substrate extending in a second plane, and optionally, wherein the aerosol-generating system is configured such that when the second aerosol-forming substrate is received in the heating chamber, the second plane of the aerosol-forming substrate is parallel to the second plane of the second part of the surface of the chamber.

[0390] 123. An aerosol-generating system according to any one of Examples Ex118 to Ex122, wherein the aerosol-generating article further comprises an air inlet, an air outlet, and an air flow path extending between the air inlet and the air outlet.

[0391] 124. An aerosol-generating system according to Example Ex123, wherein the air flow path in the aerosol-generating article contacts the aerosol-forming substrate.

[0392] 125. An aerosol-generating system according to example Ex123 or Ex124, wherein the aerosol-generating article comprises a mouthpiece and wherein the air outlet is arranged at the mouthpiece.

[0393] 126. An aerosol-generating system according to example Ex125, wherein the aerosol-generating article is configured such that when the aerosol-forming substrate is received in the heating chamber, the mouthpiece is not received in the heating chamber.

[0394] 127. An aerosol-generating system according to any one of examples Ex118 to Ex126, wherein the aerosol-generating article is planar.

[0395] 128. An aerosol-generating system according to any one of examples Ex118 to Ex127, wherein the aerosol-generating article has a rectangular or square cross-sectional shape.

[0396] 129. An aerosol-generating system according to any one of examples Ex118 to Ex128, wherein the aerosol-generating article has two planar opposing outer surfaces that extend in a plane parallel to the plane of the chamber surface, and optionally, wherein the two planar opposing outer surfaces have a substantially rectangular or square shape.

[0397] 130. An aerosol-generating system according to any one of examples Ex118 to Ex128, wherein the aerosol-generating article has an article length, and wherein the article length is between about 55 millimeters and about 65 millimeters.

[0398] 131. An aerosol-generating system according to any one of examples Ex118 to Ex130, wherein the aerosol-generating article has an article width, and wherein the article width is between about 10 millimeters and about 15 millimeters.

[0399] 132. An aerosol-generating system according to any one of examples Ex118 to Ex131, wherein the aerosol-generating article has an article thickness, and wherein the article thickness is between about 0.10 millimeters and about 7 millimeters.

[0400] 133. An aerosol-generating system according to any one of examples Ex118 to Ex132, wherein the aerosol-generating article comprises a key, and wherein the heating chamber of the aerosol-generating device is configured to receive the key when the aerosol-generating article is inserted into the heating chamber in a specific orientation. Description of the Drawings

[0401] Several examples will now be further described with reference to the accompanying drawings, in which:

[0402] Figure 1 shows a schematic view of an aerosol generating device according to the present disclosure;

[0403] Figure 2 shows along Figure 1 a schematic cross-sectional view of the aerosol generating device taken along line A-A as shown in Figure 1 ;

[0404] Figure 3 shows Figure 1 a schematic exploded view of the heater assembly of the aerosol generating device of

[0405] Figure 4 shows a schematic exploded view of an aerosol generating article according to the present disclosure suitable for use with the aerosol generating device of Figure 1 ;

[0406] Figure 5 shows Figure 4 a schematic view of the aerosol generating article of

[0407] Figure 6 shows a schematic view of an aerosol generating system according to the present disclosure, the aerosol generating system including Figure 1 the aerosol generating device of Figure 4 and the aerosol generating article of

[0408] Figure 7 shows Figure 6 a schematic view of the aerosol generating system of

[0409] Figure 8 wherein the aerosol generating article is received in the heating chamber of the aerosol generating device;

[0410] Figure 9 shows Figure 8 a schematic view of the aerosol generating system of

[0411] Figure 10 wherein the aerosol generating article is received in the heating chamber of the aerosol generating device;

[0412] Figure 11 shows Figure 10 a schematic view of the aerosol generating system of

[0413] Figure 12Shows an exploded view of an alternative aerosol - generating system according to the present disclosure, the aerosol - generating system comprising an aerosol - generating device and an aerosol - generating article;

[0414] Figure 13 Shows a schematic view of an alternative aerosol - generating system according to the present disclosure, the aerosol - generating system comprising an aerosol - generating device and an aerosol - generating article; and

[0415] Figure 14 Shows Figure 13 a schematic view of an aerosol - generating system in which an aerosol - generating article is received in a heating chamber of an aerosol - generating device. Detailed Description

[0416] Figure 1 Shows an aerosol - generating device 1 according to the present disclosure. The aerosol - generating device is a generally flat planar device having a rectangular cross - sectional shape. The aerosol - generating device has a length of 100 mm, a width of 25 mm, and a thickness of 20 mm.

[0417] The aerosol - generating device includes a housing 2 formed of PEEK. The housing 2 defines a heating chamber 3. The heating chamber 3 is configured to receive an aerosol - forming substrate. As Figure 2 shown, the heating chamber 3 is defined at one side by a first planar chamber surface 4 that extends substantially in a plane. The heating chamber 3 is further defined at an opposite side by a second planar chamber surface 5 that extends in a plane parallel to the plane of the first planar chamber surface 4. The heating chamber 3 has a rectangular cross - section. The heating chamber has a length of 50 mm, a width of 12 mm, and a depth of 4 mm. The heating chamber 3 has a proximal end that is substantially open such that an aerosol - forming substrate can be inserted into the heating chamber 3, and a distal end that is substantially closed and opposite to the proximal end.

[0418] The aerosol - generating device 1 further includes a first heating assembly 6 and a second heating assembly 7. The first heating assembly 6 is arranged at a first portion 8 of the first chamber surface 4. The second heating assembly 7 is arranged at a second portion 9 of the first chamber surface 4 that is spaced apart from the first portion 8 and the first heating assembly 6.

[0419] In this embodiment, both the first heating assembly 6 and the second heating assembly 7 are substantially the same. As Figure 3 shown, each of the first heating assembly 6 and the second heating assembly 7 includes a heating element 10, an inductor coil 11, and a shielding element 12. Each of the first heating assembly 6 and the second heating assembly 7 includes a layered structure that includes an inductor coil 11 arranged between a receptor 10 and a shielding element 12. The first heating assembly 6 and the second heating assembly 7 are substantially flat planar assemblies.

[0420] The heating element 10 is a flat planar heating element that extends in a plane. The heating element 10 is a susceptor element that can be heated by the penetration of a varying magnetic field. In this embodiment, the susceptor element is formed of ferromagnetic stainless steel.

[0421] The inductor coil 11 is a flat planar inductor coil that extends in a plane parallel to the plane of the heating element 10. The inductor coil 10 is a square coil having substantially square turns. The susceptor element 10 and the inductor coil 11 are arranged such that a varying current supplied to the inductor coil 11 generates a varying magnetic field that penetrates and heats the susceptor element 10.

[0422] The shielding element 12 is a flat planar shielding element that extends in a plane parallel to the plane of the heating element 10. Like the heating element 10, the shielding element is also formed of ferromagnetic stainless steel. The shielding element is intended to protect the electrical components arranged behind the heating assembly from the varying magnetic field generated by the inductor coil 11 when a varying current is supplied to the inductor coil 11. Another shielding element (not shown) formed of an insulating material may also be arranged behind the shielding element 12 to further protect the components arranged behind the heating assembly from the heat generated by the heating assembly.

[0423] The inductor coil 11 includes connection ends 14 that extend out from the heating assembly for connection to a power source.

[0424] Although in this embodiment, both the first heating assembly 6 and the second heating assembly 7 are substantially the same, it should be understood that in other embodiments, the second heating assembly 7 may be different from the first heating assembly 6. For example, in some other embodiments, the second inductor coil may have a different number of turns from the first inductor coil. For example, in some embodiments, the second heating element may have a different shape from the first heating element, or the second heating element may be formed of a different material from the first heating element. For example, in some embodiments, one of the first heating assembly and the second heating assembly may be a resistive heating assembly including a resistive heating element.

[0425] The first heating element 10 of the first heating assembly 6 is arranged at a first portion 8 of the first cavity surface 4. The first planar heating element 10 of the first heating assembly 6 extends substantially in a first plane parallel to the plane of the first cavity surface 4.

[0426] The second heating element 10 of the second heating assembly 7 is arranged at a second portion 9 of the first cavity surface 4. The second planar heating element 10 of the second heating assembly 7 extends substantially in a second plane parallel to the plane of the first cavity surface 4.

[0427] The aerosol generating device 1 further comprises a power control circuit 15 including a controller (not shown) and a power source 16 in the form of a rechargeable battery. The first induction coil 11 of the first heating assembly 6 is electrically connected to the power source 16 via the power control circuit 15. The second induction coil 11 of the second heating assembly 6 is also electrically connected to the power source 16 via the power control circuit 15. The controller of the power control circuit 15 controls the power supply from the power source 16 to the first induction coil 11 of the first heating assembly 6 and controls the power supply from the power source 16 to the second induction coil 11 of the second heating assembly 7.

[0428] The aerosol generating device 1 further comprises an air inlet 17 that extends through a side portion of the housing 2 into a side portion of the heating chamber 3. The air inlet 17 enables ambient air from outside the aerosol generating device 1 to be directly drawn into the heating chamber 3.

[0429] The aerosol generating device 1 further comprises a first aerosol-forming substrate detector 18 and a second aerosol-forming substrate detector 19. The first aerosol-forming substrate detector 18 is an optical sensor, such as a barcode reader, arranged opposite the first heating assembly 6 at the second chamber surface 5. The first aerosol-forming substrate detector is configured to detect an identifier, such as a barcode, on the aerosol-generating article received in the heating chamber 3 opposite the first heating assembly 6. The second aerosol-forming substrate detector 19 is an optical sensor, such as a barcode reader, arranged opposite the second heating assembly 7 at the second chamber surface 5. The second aerosol-forming substrate detector is configured to detect an identifier, such as a barcode, on the aerosol-generating article received in the heating chamber 3 opposite the second heating assembly 7.

[0430] Figure 4 Shown is an aerosol-generating article 20 according to the present disclosure suitable for use with Figure 1 the aerosol generating device 1.

[0431] The aerosol-generating article 20 is a generally flat planar aerosol-generating article having a rectangular cross-sectional shape. The aerosol-generating article is configured to be received within the heating chamber 3 of the aerosol generating device 1. The aerosol-generating article has a length of 70 millimeters, a width of 12 millimeters, and a depth of 4 millimeters.

[0432] An aerosol-generating article includes a first aerosol-forming substrate 21 and a second aerosol-forming substrate 22. In this embodiment, the composition of the first aerosol-forming substrate is different from that of the second aerosol-forming substrate 22. In this embodiment, the first aerosol-forming substrate 21 includes tobacco and an aerosol-forming agent, and the second aerosol-forming substrate 22 includes tobacco, an aerosol-forming agent, and a flavor, such as menthol. It should be understood that the first aerosol-forming substrate and the second aerosol-forming substrate can have any suitable composition, which may not include tobacco. It should be understood that in some embodiments, the compositions of the first aerosol-forming substrate and the second aerosol-forming substrate are the same.

[0433] The aerosol-generating article 20 further includes a housing 23 that defines a substrate cavity 201, and the first aerosol-forming substrate 21 and the second aerosol-forming substrate 22 are disposed in the substrate cavity. The housing 23 of the aerosol-generating article 20 includes a frame 231 surrounding the sides of the first aerosol-forming substrate 21 and the second aerosol-forming substrate 22, and a top plate 24 and a bottom plate 25 extending above opposite ends of the frame 231. The first aerosol-forming substrate 21 is disposed toward the proximal end of the substrate cavity 201, and the second aerosol-forming substrate is disposed toward the distal end of the substrate cavity 201. The first aerosol-forming substrate 21 and the second aerosol-forming substrate 22 are spaced apart in the substrate cavity 201 such that air can flow between the first aerosol-forming substrate 21 and the second aerosol-forming substrate 22.

[0434] The frame 231 of the aerosol-generating article further defines an air inlet 26 that extends through the side of the frame 231 into an airflow path 27. The airflow path 27 extends in the distal direction in the article 20 along the substrate cavity 201 to an air outlet 28 at the distal end of the substrate cavity 201. Thus, ambient air can be drawn into the substrate cavity 201 of the article 20 through the air inlet 26, the airflow path 27, and the air outlet 28.

[0435] The aerosol-generating article 20 further includes a mouthpiece portion 29 at the proximal end of the article 20. The mouthpiece portion 29 of the article 20 includes a mouthpiece opening 30 that extends into the proximal end of the substrate cavity 201.

[0436] Figure 6 and 7 An aerosol-generating device 1 for use with the aerosol-generating article 20 is shown.

[0437] The aerosol-generating article 20 can be received in a heating cavity 3 of the aerosol-generating device 1. When the aerosol-generating article 20 is received in the heating cavity 3 of the aerosol-generating device 1, the mouthpiece portion 29 of the aerosol-generating article 20 remains outside the heating cavity 3 such that a user can place their lips on the mouthpiece portion 29 of the aerosol-generating article 20 and draw on the aerosol-generating system to receive an aerosol.

[0438] When the aerosol-generating article 20 is received in the heating chamber 3 of the aerosol-generating device 1, the air inlet 26 of the aerosol-generating article 20 is aligned with the air inlet 17 of the aerosol-generating device 1. In this arrangement, an air flow path is provided between the air inlet 17 of the aerosol-generating device 1 and the mouthpiece opening 30 of the aerosol-generating article. The air flow path enables ambient air to be drawn into the aerosol-generating article by the user sucking on the mouthpiece portion 29 of the aerosol-generating article 20.

[0439] In use, when the user sucks on the mouthpiece portion 29 of the aerosol-generating article 20, ambient air is drawn into the aerosol-generating device 1 via the air inlet 17. The ambient air is drawn directly into the heating chamber 3 and the aerosol-generating article 20 via the air inlet 26 that is aligned with the air inlet 17. The air drawn into the aerosol-generating article 20 via the air inlet 26 is drawn through the air flow path 27 and exits through the air outlet 28 and into the matrix chamber 201. The air in the matrix chamber 201 is able to flow over and mix above the first aerosol-forming matrix 21 and the second aerosol-forming matrix 22. Thus, when both the first aerosol-forming matrix 21 and the second aerosol-forming matrix 22 are heated and release volatile compounds, the volatile compounds released from both the first aerosol-forming matrix and the second aerosol-forming matrix are mixed in the matrix chamber 201. Then, the air and any volatile compounds released from the heated matrix in the matrix chamber 201 are drawn out of the proximal end of the matrix chamber 201 and into the mouthpiece portion 29, where the volatile compounds cool and condense to form an aerosol. The aerosol in the mouthpiece portion is drawn out of the aerosol-generating article 20 and delivered to the user at the mouthpiece opening 30.

[0440] When the aerosol-generating article 20 is received in the heating chamber 3, the first aerosol-forming matrix 21 is disposed at a first portion 8 of the first chamber surface 4, and the second aerosol-forming matrix 22 is disposed at a second portion 9 of the first chamber surface 4. Thus, the first heating assembly 6 is arranged to heat the first aerosol-forming matrix 21, and the second heating assembly 7 is arranged to heat the second aerosol-forming matrix 22. The first heating element 10 of the first heating assembly 6 is arranged to be close to the first aerosol-forming matrix 21, separated only by the housing 23 of the aerosol-generating article 20. Accordingly, the heat transfer from the first heating element 10 of the first heating assembly 6 to the first aerosol-forming matrix 21 is high. The second heating element 10 of the second heating assembly 7 is arranged to be close to the second aerosol-forming matrix 22, separated only by the housing 23 of the aerosol-generating article 20. Accordingly, the heat transfer from the second heating element 10 of the second heating assembly 7 to the second aerosol-forming matrix 22 is high.

[0441] The aerosol-generating article 20 further includes a first identifier (not shown) in the form of a first barcode and a second identifier (not shown) in the form of a second barcode. The first barcode is arranged on the outer surface of the bottom plate 25 of the housing 23 of the article 20 and is aligned with the first aerosol-forming substrate 21. The second barcode is arranged on the outer surface of the bottom plate 25 of the housing 23 of the article 20 and is aligned with the second aerosol-forming substrate 22. When the aerosol-generating article 20 is received in the heating chamber 3, the first aerosol-forming substrate detector 18 is aligned with the first barcode, and the second aerosol-forming substrate detector 19 is aligned with the second barcode.

[0442] The first barcode contains information identifying the first aerosol-forming substrate. When the aerosol-generating article 20 is received in the heating chamber 3, the first aerosol-forming substrate detector 18 detects the first barcode and sends the information identifying the first aerosol-forming substrate 21 to the controller of the power control circuit 15. The controller is configured to control the power to the first induction coil 10 of the first heating assembly 6 based on the information received from the first aerosol-forming substrate detector 18. In this way, the controller is configured to adjust the temperature to which the first aerosol-forming substrate 21 is heated to optimize the aerosol generation of the first aerosol-forming substrate 21.

[0443] The second barcode contains information identifying the second aerosol-forming substrate. When the aerosol-generating article 20 is received in the heating chamber 3, the second aerosol-forming substrate detector 19 detects the second barcode and sends the information identifying the second aerosol-forming substrate 22 to the controller of the power control circuit 15. The controller is configured to control the power to the second induction coil 10 of the second heating assembly 7 based on the information received from the second aerosol-forming substrate detector 19. In this way, the controller is configured to adjust the temperature to which the second aerosol-forming substrate 22 is heated to optimize the aerosol generation of the second aerosol-forming substrate 22.

[0444] The aerosol-generating device 1 further includes a user interface connected to the controller of the power supply circuit 15, which enables the user to control the generation of aerosol from the aerosol-generating system. In this embodiment, the user interface includes a first user input 31 in the form of a button and a second user input 32 in the form of a button. The controller is configured to supply power to the first heating element 10 of the first heating assembly 6 when the user selects the first user input 31. The controller is configured to supply power to the second heating element 10 of the second heating assembly 7 when the user selects the second user input 32. The user can select both the first user input 31 and the second user input 32 simultaneously to supply power to both the first heating assembly 6 and the second heating assembly 7. Thus, the user can control the aerosol generated by the aerosol-generating system.

[0445] Figure 8 and 9Shows another aerosol generating system according to the present disclosure. Figure 8 and 9 The aerosol generating system of Figure 6 and 7 is substantially the same as the aerosol generating system of

[0446] Figure 8 and 9 The aerosol generating system of

[0447] includes an aerosol generating device 1 and an aerosol generating article 20.

[0448] The aerosol generating device 1 includes a housing 2 defining a heating chamber 3, wherein a first inductive heating assembly 6 is disposed at a first portion 8 of the first chamber surface, and a second inductive heating assembly 7 is disposed at a second portion 9 of the first chamber surface. The aerosol generating device 1 further includes a power control circuit 15 and a power supply 16.

[0449] Figure 8 and 9 The aerosol generating system of Figure 6 and 7 is different from the aerosol generating system of Figure 6 and 7 in terms of the configuration of the airflow path through the aerosol generating system. In the embodiments of Figure 8 and 9 the airflow path mainly extends through the aerosol generating article, while in the embodiments of

[0450] Figure 8 and 9 The aerosol generating device 1 includes an air inlet 17 that extends through a side of the housing 2 but does not directly extend into the side of the heating chamber 3. The air inlet 17 extends into the airflow path 33. The airflow path 33 extends along the heating chamber 3 in a distal direction in the device 1 to an air outlet 34 at the distal end of the heating chamber 3.

[0451] Figure 8 and 9 The aerosol generating article 20 of

[0452] When the aerosol - generating article 20 is received in the heating chamber 3, the air inlet 26 of the aerosol - generating article 20 is aligned with the air outlet 34 of the aerosol - generating device 1. In use, when the user sucks on the mouthpiece portion 29 of the aerosol - generating article 20, air is inhaled into the aerosol - generating device 1 through the air inlet 17, passes through the airflow path 33 and enters the heating chamber 3 through the air outlet 34. The air is drawn from the air outlet 34 of the aerosol - generating device 1 into the aerosol - generating article 20 at the air inlet 26 of the aerosol - generating article 20, passes through the matrix chamber 201, and exits the aerosol - generating article 20 at the mouthpiece opening 30.

[0453] Advantageously, providing such a tortuous airflow path through the aerosol - generating device can enable the aerosol - generating system to more accurately control the draw resistance through the system.

[0454] It should be understood that in some embodiments, the aerosol - generating device may not be provided with an air inlet or an airflow path, because when the aerosol - generating article is received in the heating chamber 3, the air inlet of the aerosol - generating article can be arranged outside the heating chamber 3.

[0455] Figure 10 and 11 Another aerosol - generating system according to the present disclosure is shown. Figure 10 and 11 The aerosol - generating system of Figure 6 and 7 is substantially the same as the aerosol - generating system of

[0456] Figure 10 and 11 The aerosol - generating system of

[0457] The aerosol - generating device 1 is a generally flat planar device having a rectangular cross - sectional shape. The aerosol - generating device 1 has a length of 100 mm, a width of 25 mm, and a thickness of 20 mm.

[0458] The aerosol - generating device 1 includes a housing 2 formed of PEEK. The housing 2 defines a heating chamber 3. The heating chamber 3 is configured to receive an aerosol - forming matrix. The heating chamber 3 is defined on one side by a first planar chamber surface 4 that extends substantially in a plane. The heating chamber 3 is further defined on the opposite side by a second planar chamber surface 5 that extends in a plane parallel to the plane of the first planar chamber surface 4. The heating chamber 3 has a rectangular cross - section. The heating chamber has a length of 50 mm, a width of 12 mm, and a depth of 4 mm. The heating chamber 3 has a proximal end that is substantially open so that the aerosol - forming matrix can be inserted into the heating chamber 3, and a distal end that is substantially closed and opposite to the proximal end.

[0459] The aerosol generating device 1 further includes a first heating assembly 6 and a second heating assembly 7. The first heating assembly 6 is disposed at the first cavity surface 4. The second heating assembly 7 is disposed at the second cavity surface 5. The second heating assembly 7 is disposed opposite to the first heating assembly 6 and is spaced apart from the first heating assembly 6 by the width of the heating cavity 3.

[0460] In this embodiment, both the first heating assembly 6 and the second heating assembly 7 are substantially the same. Each of the first heating assembly 6 and the second heating assembly 7 includes a planar resistive heating element. The first planar resistive heating element of the first heating assembly 6 is disposed at the first cavity surface and extends in a first plane parallel to the plane of the first cavity surface 4. The second planar resistive heating element of the second heating assembly 7 is disposed at the second cavity surface and extends in a second plane parallel to the plane of the second cavity surface 5.

[0461] The aerosol generating device 1 further includes a power control circuit 15 including a controller (not shown) and a power source 16 in the form of a rechargeable battery.

[0462] The first heating element of the first heating assembly 6 is electrically connected to the power source 16 via the power control circuit 15. The second heating element of the second heating assembly 7 is electrically connected to the power source 16 via the power control circuit 15. The controller of the power control circuit 15 controls the power supply from the power source 16 to the first heating element of the first heating assembly 6 and controls the power supply from the power source 16 to the second heating element of the second heating assembly 7.

[0463] The aerosol generating device 1 further includes an air inlet 17 extending through a side of the housing 2 into the airflow path 33. The airflow path 33 extends in the device 1 in a distal direction along the heating cavity 3 to an air outlet 34 at the distal end of the heating cavity 3. The air inlet 17, the airflow path 33 and the air outlet 34 enable ambient air from outside the aerosol generating device 1 to be directly drawn into the heating cavity 3.

[0464] The aerosol generating article 20 is a generally flat planar aerosol generating article having a rectangular cross-sectional shape. The aerosol generating article is configured to be received within the heating cavity 3 of the aerosol generating device 1. The aerosol generating article has a length of 70 millimeters, a width of 12 millimeters and a depth of 4 millimeters.

[0465] The aerosol generating article includes an aerosol-forming substrate 21. In this embodiment, the first aerosol-forming substrate 21 includes tobacco and an aerosol-forming agent.

[0466] The aerosol generating article 20 further includes a housing 23 defining a substrate cavity 201, and the aerosol-forming substrate 21 is disposed in the substrate cavity.

[0467] The housing 23 of the aerosol-generating article further defines an air inlet 26 that extends through a side of the housing 23 at the distal end of the article 20 into the substrate chamber 201. Thus, ambient air can be drawn through the air inlet 26 into the substrate chamber 201 of the article 20.

[0468] The aerosol-generating article 20 further includes a mouthpiece portion 29 at the proximal end of the article 20. The mouthpiece portion 29 of the article 20 includes a proximal portion of the substrate chamber 201 that does not include the aerosol-forming substrate 21. In the proximal portion of the substrate chamber 201, volatile compounds released from the heated aerosol-forming substrate 21 can cool and condense to form an aerosol. The mouthpiece portion 29 of the article 20 further includes a mouthpiece opening 30 that extends to the proximal end of the substrate chamber 201. The mouthpiece opening 30 allows the aerosol generated in the substrate chamber 201 to be withdrawn from the substrate chamber 201.

[0469] Thus, an airflow path is formed through the aerosol-generating article 20 that includes the air inlet 26, the substrate chamber 201, and the air outlet 30.

[0470] Figure 11 An aerosol-generating device 1 for use with the aerosol-generating article 20 is shown.

[0471] The aerosol-generating article 20 can be received in the heating chamber 3 of the aerosol-generating device 1. When the aerosol-generating article 20 is received in the heating chamber 3 of the aerosol-generating device 1, the mouthpiece portion 29 of the aerosol-generating article 20 remains outside the heating chamber 3 such that a user can place their lips on the mouthpiece portion 29 of the aerosol-generating article 20 and draw on the aerosol-generating system to receive the aerosol.

[0472] When the aerosol-generating article 20 is received in the heating chamber 3 of the aerosol-generating device 1, the air inlet 26 of the aerosol-generating article 20 is aligned with the air outlet 34 of the aerosol-generating device 1. In this arrangement, an airflow path is provided between the air inlet 17 of the aerosol-generating device 1 and the mouthpiece opening 30 of the aerosol-generating article 20. The airflow path allows ambient air to be drawn into the aerosol-generating article 20 by the user drawing on the mouthpiece portion 29 of the aerosol-generating article 20.

[0473] When the aerosol-generating article 20 is received in the heating chamber 3, the aerosol-forming substrate 21 is disposed between the first heating element of the first heating assembly 6 and the second heating element of the second heating assembly 7. Thus, the first and second heating elements are arranged to heat the aerosol-forming substrate 21 from opposite sides. The first and second heating elements are arranged close to the aerosol-forming substrate 21 and are separated only by the housing 23 of the aerosol-generating article 20.

[0474] In use, when power is supplied from the power source 16 to the first heating element of the first heating assembly 6 and power is supplied to the second heating element of the second heating assembly 7 for heating the aerosol-forming substrate, the control circuit 15 supplies power to the first and second heating elements simultaneously such that the aerosol-forming substrate 21 is heated from opposite sides simultaneously. This promotes uniform heating of the aerosol-forming substrate.

[0475] In use, when a user draws on the mouthpiece portion 29 of the aerosol-generating article 20, ambient air is drawn into the aerosol-generating device 1 via the air inlet 17. The ambient air is drawn into the heating chamber 3 via the airflow path 33 and the air outlet 34, and is drawn into the aerosol-generating article 20 via the air inlet 26. The air drawn into the aerosol-generating article 20 via the air inlet 26 is drawn into the substrate chamber 201. The air in the substrate chamber 201 is able to flow above the aerosol-forming substrate 21. Thus, when the aerosol-forming substrate 21 is heated and releases volatile compounds, the volatile compounds released from the aerosol-forming substrate 21 are drawn out of the proximal end of the substrate chamber 201 and into the mouthpiece portion 29, where the volatile compounds cool and condense to form an aerosol. The aerosol in the mouthpiece portion 29 is drawn out of the aerosol-generating article 20 and delivered to the user at the mouthpiece opening 30. Thus, an airflow path through the aerosol-generating system is formed, the aerosol-generating system including the air inlet 17, the airflow path 33, the air outlet 34, the air inlet 26, the substrate chamber 201 and the air outlet 30.

[0476] Figure 12 Another aerosol-generating system according to the present disclosure is shown. Figure 12 The aerosol-generating system of Figure 9 and 10 is substantially the same as the aerosol-generating system of

[0477] Figure 12 The aerosol-generating system of Figure 9 and 10 includes an aerosol-generating device 1 similar to the aerosol-generating device 1 of Figure 9 and 10 and an aerosol-generating article 20 identical to the aerosol-generating article 20 of

[0478] Figure 12 The aerosol-generating device 1 of Figure 9 and 10 differs from the aerosol-generating device 1 of Figure 12The aerosol generating device 1 includes a heater frame 35. The heater frame 35 includes a frame received within the proximal end of the housing 2 of the aerosol generating device. The heater frame 35 defines a heating chamber 3 and provides a structure to which a first heating assembly 6 and a second heating assembly 7 are mounted.

[0479] The provision of the heater frame 35 to which the heating elements and the heating assemblies are mounted can facilitate the manufacture and maintenance of the aerosol generating device. In this embodiment, a first heating element of the first heating assembly 6 and a second heating element of the second heating assembly 7 are mounted to the outer surface of the heater frame 35 at opposite sides. This arrangement facilitates the electrical connection of the heating assemblies to the power supply of the aerosol generating device 1. However, it should be understood that in some embodiments, the heating elements may be mounted to the inner surface of the heater frame 35, and the heating elements may define part of the surface of the heating chamber 3. This arrangement can improve the heat transfer from the heating elements to the aerosol generating article received within the heating chamber 3.

[0480] The heater frame 35 can be made of any suitable material. In this embodiment, the heater frame 35 is formed of PEEK, which is the same material as the housing 2 of the aerosol generating device 1. The heater frame 35 can be formed of any material suitable for the housing 2 of the aerosol generating device 1. In some embodiments, the heater frame 35 may be formed of a material having a high thermal conductivity. This can improve the heat transfer from the heating assemblies to the aerosol generating article, particularly in the case where the heating elements are mounted to the outer surface of the heater frame. For example, the heater frame can be formed of aluminum. In the case where the heater frame is formed of a conductive material, it may be necessary to electrically insulate the heating elements and the heating assemblies from the heater frame.

[0481] Figure 13 and 14 shows another aerosol generating system according to the present disclosure. Figure 13 and 14 The aerosol generating system of is substantially the same as the aerosol generating system of and the same features are denoted by the same reference numerals. Figure 10 and 11 The aerosol generating system 1 of and is different from the aerosol generating system 1 of and in that

[0482] Figure 13 and 14 The aerosol generating system 1 of and is different from the aerosol generating system 1 of and in that Figure 10 and 11 The aerosol generating device 1 of and includes a mouthpiece 36, and Figure 13 and 14 The aerosol generating article 20 of and does not include a mouthpiece portion. Figure 13 and 14 The aerosol generating article 20 of and does not include a mouthpiece portion.

[0483] Figure 13 and14 The aerosol generating device 1 includes a removable mouthpiece 36 configured to be disposed above the open proximal end of the housing 2 and substantially enclose the proximal end of the heating chamber 3. Although the mouthpiece 36 is removable from the housing 2 of the aerosol generating device in this embodiment, it should be understood that in other embodiments, the mouthpiece may be movably coupled to the housing 2 of the aerosol generating device 1, for example, by a hinge.

[0484] When the mouthpiece 36 is received on the housing 2, the mouthpiece 36 defines the proximal end of the heating chamber 3. When the aerosol generating article 20 is received in the heating chamber 3, the mouthpiece 36 extends above the proximal end of the aerosol generating article 20, substantially enclosing the aerosol generating article 20 in the heating chamber 3. When the aerosol generating article 20 is received in the heating chamber 3 and the mouthpiece 36 is received on the housing 2, a space is provided at the proximal end of the heating chamber 3 between the proximal end of the housing 23 of the aerosol generating article 20 and the mouthpiece 36. This space is provided so that volatile compounds released from the heated aerosol forming substrate 21 can cool before being delivered to the user. Providing this space between the aerosol generating article 20 and the mouthpiece 36 allows the matrix chamber 201 of the aerosol generating article 20 to be filled with the aerosol forming substrate, and can allow the matrix chamber 201 and the entire aerosol generating article 20 to be smaller than Figure 10 and 11 the aerosol generating article 20.

[0485] The mouthpiece 36 of the aerosol generating device 1 is formed of the same material as the housing 2 of the aerosol generating device.

[0486] The mouthpiece 36 includes an air outlet 37 so that the aerosol formed in the heating chamber 3 can be drawn out of the heating chamber 3 by the user sucking on the mouthpiece 36.

[0487] In use, when a user draws on the mouthpiece 36 of the aerosol-generating device 1, ambient air is inhaled into the aerosol-generating device 1 via the air inlet 17. The ambient air is drawn through the airflow path 33 and the air outlet 34 into the heating chamber 3, and is drawn through the air inlet 26 into the aerosol-generating article 20. The air drawn into the aerosol-generating article 20 through the air inlet 26 is drawn into the matrix chamber 201. The air in the matrix chamber 201 is able to flow over the aerosol-forming matrix 21. When the aerosol-forming matrix 21 is heated and releases volatile compounds, the volatile compounds released from the aerosol-forming matrix 21 are drawn out of the aerosol-generating article 20 at the opening 30 and into the proximal end of the heating chamber 3. The volatile compounds cool and condense to form an aerosol in the proximal end of the heating chamber 3, and the aerosol is drawn out of the proximal end of the heating chamber 3 at the air outlet 37, where the aerosol is delivered to the user. Thus, an airflow path through the aerosol-generating system is formed, the aerosol-generating system including the air inlet 17, the airflow path 33, the air outlet 34, the air inlet 26, the matrix chamber 201, the air outlet 30, the proximal end of the heating chamber 3, and the air outlet 37.

[0488] For the purposes of this specification and the appended claims, unless otherwise indicated, all numbers expressing amounts, quantities, percentages, etc. should be understood to be modified in all instances by the term "about". Moreover, all ranges include the disclosed maximum and minimum points, and include any intermediate ranges therebetween that may be specifically enumerated or may not be enumerated herein. Thus, in this context, the number A is understood as A ± 5%A. In this context, the number A may be regarded as including values within the normal standard error for the measurement of the property modified by the number A. In certain cases used in the appended claims, the number A may deviate from the percentages recited above, provided that the amount by which A deviates does not substantially affect the basic and novel features of the claimed invention. Moreover, all ranges include the disclosed maximum and minimum points, and include any intermediate ranges therebetween that may be specifically enumerated or may not be enumerated herein.

Claims

1. An aerosol generating system, comprising: an aerosol generating article, the aerosol generating article comprising: a housing defining a matrix chamber; and an aerosol-forming matrix disposed in the matrix chamber; and an aerosol generating device, the aerosol generating device comprising: a heating chamber configured to receive at least a portion of the aerosol generating article, the heating chamber being defined at one side by a planar chamber surface extending substantially in a plane; a first heating assembly, the first heating assembly comprising a planar first heating element extending substantially in a first plane parallel to the plane of the chamber surface; and a second heating assembly, the second heating assembly comprising a planar second heating element extending substantially in a second plane parallel to the plane of the chamber surface.

2. The aerosol generating system according to claim 1, wherein the aerosol generating article comprises an air inlet, an air outlet, and an airflow path extending between the air inlet and the air outlet.

3. The aerosol generating system according to claim 2, wherein the airflow path is configured such that ambient air can flow from the air inlet through the airflow path and out of the air outlet and into the matrix chamber.

4. The aerosol generating system according to any one of claims 1, 2 or 3, wherein: the planar chamber surface comprises: a first planar chamber surface extending substantially in a plane; and a second planar chamber surface extending substantially in a plane, the second planar chamber surface being opposite to the first planar chamber surface and the plane of the second chamber surface being parallel to the plane of the first chamber surface; and the first heating element is disposed at the first chamber surface, and the second heating element is disposed at the second chamber surface.

5. The aerosol generating system according to any one of claims 1 to 3, wherein: the first heating element is disposed at a first portion of the chamber surface or disposed around a first portion of the chamber surface or forms a first portion of the chamber surface; and the second heating element is disposed at a second portion of the chamber surface or disposed around a second portion of the chamber surface or forms a second portion of the chamber surface.

6. The aerosol generating system according to any one of claims 1 to 5, wherein the aerosol generating device further comprises a controller, wherein the controller is configured to control the power supply to the first heating assembly to heat the first heating element, wherein the controller is configured to control the power supply to the second heating assembly to heat the second heating element, and wherein the power supply to the second heating assembly is independent of the power supply to the first heating assembly.

7. The aerosol-generating system according to claim 6, wherein the controller is further configured to control the power supply to the first heating assembly to heat the first heating element to a first operating temperature, and wherein the controller is further configured to control the power supply to the second heating assembly to heat the second heating element to a second operating temperature, the second operating temperature being different from the first operating temperature.

8. The aerosol-generating system according to any one of claims 1 to 7, wherein the first heating assembly further comprises a first shielding element, and the first heating element is arranged between the cavity surface and the first shielding element.

9. The aerosol-generating system according to any one of claims 1 to 8, wherein the second heating assembly further comprises a second shielding element, and the second heating element is arranged between the cavity surface and the second shielding element.

10. The aerosol-generating system according to any one of claims 1 to 9, wherein the first heating assembly further comprises a planar first inductor coil.

11. The aerosol-generating system according to claim 10, wherein the first heating assembly further comprises a planar first sensor element, the planar first sensor element extending in a first plane parallel to the plane of the cavity surface, and the first sensor element is arranged between the cavity surface and the first inductor coil.

12. The aerosol-generating system according to claim 11, wherein the shape of the first sensor element is substantially the same as the shape of the first inductor coil.

13. The aerosol-generating system according to any one of claims 1 to 9, wherein the first heating element is a resistive heating element.

14. The aerosol-generating system according to any one of claims 1 to 13, wherein the second heating assembly further comprises a planar second inductor coil.

15. The aerosol-generating system according to claim 14, wherein the second heating assembly further comprises a planar second sensor element, the planar second sensor element extending in a second plane parallel to the plane of the cavity surface, and the second sensor element is arranged between the cavity surface and the second inductor coil.

16. The aerosol-generating system according to claim 15, wherein the shape of the second sensor element is substantially the same as the shape of the second inductor coil.

17. The aerosol-generating system according to any one of claims 1 to 13, wherein the second heating element is a resistive heating element.

18. The aerosol-generating system according to any one of claims 1 to 17, wherein a second part of the cavity surface is adjacent to or spaced apart from a first part of the cavity surface.

19. The aerosol-generating system according to any one of claims 1 to 18, wherein: the cavity surface is a first cavity surface; the heating cavity is further defined at a second cavity surface opposite the first cavity surface; The first aerosol-forming substrate detector is arranged at or around a first portion of the second chamber surface opposite a first portion of the first chamber surface; and the second aerosol-forming substrate detector is arranged at or around a second portion of the second chamber surface opposite a second portion of the first chamber surface.

Images