Aerosol provision device

Abstract

To provide an aerosol provision device shielding electrical components of the device from the electromagnetic radiation generated by inductor coils.SOLUTION: The device comprises a receptacle configured to receive aerosol generating material, where the aerosol generating material is heatable by a susceptor 132. The device further comprises an inductor coil 124, 126 extending around the receptacle, where the inductor coil is configured to generate a varying magnetic field for heating the susceptor. The device further comprises a magnetic shield member 202 extending at least partially around the inductor coil.SELECTED DRAWING: Figure 6

Description

[Technical Field]

[0001] The present invention relates to an aerosol delivery device and a magnetic shielding member for an aerosol delivery device. [Background technology]

[0002] Smoking articles, such as cigarettes and cigars, burn tobacco to produce tobacco smoke during use. Attempts have been made to provide alternatives to these tobacco-burning articles by creating products that release compounds without combustion. Examples of such products include heating devices that release compounds by heating, rather than burning, a material. The material can be, for example, tobacco or other non-tobacco products, which may or may not contain nicotine. Summary of the Invention

[0003] According to a first aspect of the present disclosure, a receptacle configured to receive an aerosol-forming material, the aerosol-forming material being heatable by the susceptor; an inductor coil extending around the receptacle, the inductor coil configured to generate a varying magnetic field for heating the susceptor; a magnetic shield member extending at least partially around the inductor coil; An aerosol delivery device is provided, comprising:

[0004] According to a second aspect of the present disclosure, there is provided a magnetic shielding member for an aerosol delivery device, the magnetic shielding member being formed from a sheet, a magnetic shield layer; an adhesive layer applied to a first side of the magnetic shield layer; a laminate layer applied to the second side of the magnetic shield layer; a first notch formed in the sheet, the first notch configured to receive a section of wire forming a first inductor coil of the aerosol delivery device; a second notch formed in the sheet, the second notch configured to receive a section of wire forming a second inductor coil of the aerosol delivery device; A magnetic shield member is provided, comprising:

[0005] According to a third aspect of the present disclosure, 1. An aerosol delivery device comprising: a susceptor positioned to heat the aerosol-generating material; an inductor coil extending around the susceptor, the inductor coil configured to generate a varying magnetic field for heating the susceptor; an outer cover forming at least a portion of an outer surface of the aerosol delivery device, the outer surface of the outer cover being spaced apart from the outer surface of the susceptor; 1. An aerosol delivery device comprising: An aerosol delivery device is provided in which, in use, the temperature of the exterior surface remains below about 48°C.

[0006] Further features and advantages of the present invention will become apparent from the following description of preferred embodiments of the invention, given by way of example only, made with reference to the accompanying drawings, in which: [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a front view of an example aerosol delivery device. [Figure 2] FIG. 2 is a front view of the aerosol delivery device of FIG. 1 with the outer cover removed. [Figure 3] 2 is a cross-sectional view of the aerosol delivery device of FIG. 1. [Figure 4] FIG. 3 is an exploded view of the aerosol delivery device of FIG. 2. [Figure 5]FIG. 5A is a cross-sectional view of a heating assembly in an aerosol delivery device, and FIG. 5B is a detailed view of a portion of the heating assembly of FIG. 5A. [Figure 6] 1 is a perspective view of an exemplary magnetic shield member disposed within an aerosol delivery device. [Figure 7] 1 is a diagrammatic representation of a cross section of an exemplary magnetic shield member. [Figure 8] FIG. 7 is a top view of the structure shown in FIG. 6. [Figure 9] FIG. 2 is a perspective view of an exemplary magnetic shield member. [Figure 10] 1 is a diagrammatic representation of a first exemplary magnetic shield member comprising a notch. [Figure 11] 10 is a diagrammatic representation of a second exemplary magnetic shield member including a notch. [Figure 12] 10 is a diagrammatic representation of a third exemplary magnetic shield member with an aperture. DETAILED DESCRIPTION OF THE INVENTION

[0008] As used herein, the term "aerosol-forming material" includes materials that provide volatilization upon heating, typically in the form of an aerosol. Aerosol-forming materials can include any tobacco-containing material, such as one or more of tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, or tobacco substitutes. Aerosol-forming materials can also include other non-tobacco products, which may or may not contain nicotine, depending on the product. Aerosol-forming materials can be in the form of, for example, a solid, liquid, gel, or wax. Aerosol-forming materials can also be, for example, a combination or blend of materials. Aerosol-forming materials are sometimes known as "smoking materials."

[0009] Devices are known that heat aerosol-generating materials without burning or combusting the aerosol-generating materials to volatilize at least one component of the aerosol-generating materials, typically forming an inhalable aerosol. Such devices are sometimes described as "aerosol-generating devices," "aerosol-delivery devices," "non-combustion heating devices," "tobacco heating product devices," or "tobacco heating devices," or the like. Similarly, there are so-called e-cigarette devices, which typically vaporize aerosol-generating materials in liquid form, which may or may not contain nicotine. The aerosol-generating materials may take the form of, or be provided as part of, a rod, cartridge, cassette, or the like that can be inserted into the device. A heater for heating and volatilizing the aerosol-generating materials may be provided as a "permanent" part of the device.

[0010] The aerosol delivery device can accept an article containing an aerosol-generating material for heating. An "article" in this context is a component that, in use, contains or contains the aerosol-generating material that is heated to volatilize the aerosol-generating material, and other optional components. A user can insert the article into the aerosol delivery device, which then heats to generate an aerosol that is subsequently inhaled by the user. The article can be, for example, of a predetermined or specific size configured to be placed within a heating chamber of the device sized to accept the article.

[0011] A first aspect of the present disclosure defines an aerosol delivery device having a receptacle configured to receive an aerosol-generating material, the aerosol-generating material being heatable by a susceptor. The receptacle can be defined, for example, by a susceptor such that the susceptor receives the aerosol-generating material. For example, the susceptor can be substantially tubular (i.e., hollow) and can receive the aerosol-generating material therein. In one example, the aerosol-generating material is essentially tubular or cylindrical, e.g., what might be known as a "tobacco stick," and the aerosolizable material can include tobacco formed in a particular shape, which is then coated or wrapped with one or more other materials, such as paper or foil. Alternatively, the susceptor may not be a component of the device, but may be attached to or included in an article introduced into the device.

[0012] The susceptor can be heated by penetrating the susceptor with a varying magnetic field generated by at least one inductor coil, and the heated susceptor then heats the aerosol-generating material located within the susceptor. Accordingly, the device further includes an inductor coil extending around the receptacle / susceptor.

[0013] To shield the electrical components of the device (and other nearby electrical devices) from the electromagnetic radiation generated by the inductor coil, the device can include a magnetic shielding member to block / absorb the electromagnetic radiation. The magnetic shielding member can include one or more layers / sheets of a ferrite material that reduces the effects of the electromagnetic radiation.

[0014] In a first aspect, a magnetic shielding member extends at least partially around the inductor coil, the magnetic shielding member comprising a material, such as a ferrite material, that absorbs / blocks electromagnetic radiation.

[0015] Preferably, the magnetic shielding member is in contact with the inductor coil. Often, ferrite material is applied to the inner surface of the device's housing / cover, which requires a large amount of ferrite material to adequately contain electromagnetic radiation. This material can be relatively heavy, bulky, and expensive, so it is desirable to reduce its usage. By placing it closer to the inductor coil, the amount of ferrite material required is reduced. It has been found that in some situations, the amount of material used can be reduced by up to 30%.

[0016] In addition to this benefit, it has surprisingly been found that contact with the inductor coil creates an effective thermal barrier between the hot susceptor and the outer casing / housing of the device. For example, an insulating air gap is provided between the magnetic shielding member and the outer cover / housing of the device. The magnetic shielding member can also act as an insulator, trapping heat in the vicinity of the susceptor and inductor coil. These effects reduce the surface temperature of the device, thereby making it more comfortable and safe to use.

[0017] In some examples, the device further comprises a temperature sensor in contact with the inductor coil to measure the temperature of the inductor coil. When the magnetic shield member is in contact with the inductor coil, the temperature sensor can more accurately measure the temperature of the inductor coil.

[0018] The inductor coil may extend in a helical fashion around the susceptor / receptacle. The susceptor may define a longitudinal axis, whereby the magnetic shielding member extends azimuthally around this longitudinal axis, thus forming a full or partial tubular structure.

[0019] The magnetic shielding member can include a magnetic shielding layer, such as a ferrite layer. Ferrite is a ferrimagnetic material, meaning that it can be magnetized and / or attracted to a magnet. In some examples, the magnetic shielding layer is magnetized.

[0020] The aerosol delivery device can include two or more inductor coils. For example, a first inductor coil can extend around a first portion of the receptacle / susceptor, and a second inductor coil can extend around a second portion of the receptacle / susceptor. The first and second inductor coils can be positioned adjacent to each other in a direction along the longitudinal axis of the receptacle / susceptor. In such a device, a magnetic shield member can contact and extend at least partially around the first and second inductor coils.

[0021] In some configurations, the magnetic shielding member can be adhered to the inductor coil by an adhesive layer. The adhesive layer holds the magnetic shielding member in place, thereby ensuring proper shielding from electromagnetic radiation. An adhesive can be applied to the inductor coil, and the magnetic shielding member can be in contact with the adhesive. Alternatively, the magnetic shielding member can include an adhesive layer and thus be self-adhesive. For example, the magnetic shielding member can include a magnetic shielding layer and an adhesive layer. The adhesive layer can be formed on the inner surface of the magnetic shielding member (i.e., the surface located closest to the inductor coil). This can make assembling the device more efficient and effective. For example, the magnetic shielding member can be applied directly to the inductor coil without first applying an adhesive to the inductor coil.

[0022] The magnetic shielding member can be wrapped around the inductor coil and at least partially bonded to itself. Because the magnetic shielding member is partially or completely sealed along its length, such a construction provides more protective / sealed shielding from electromagnetic radiation. For example, a first edge of the magnetic shielding member can overlap a second edge of the magnetic shielding member, with the magnetic shielding member being bonded / attached to itself in this overlapping region. To this end, the magnetic shielding member can be formed from a sheet that is rolled into a tubular shape. For example, the bonding can be provided by an adhesive layer on the magnetic shielding member.

[0023] The magnetic shielding member can include at least one magnetic shielding layer and at least one laminate layer, which can be included in addition to or instead of an adhesive layer. It has been found that ferrite materials (i.e., magnetic shielding layers) can begin to break down over time as a result of repeated heating and cooling within the aerosol delivery device. The breaking down material can become loose and rattle within the device. The loosened material can damage or affect other components of the device. By including a laminate layer (such as a film layer), the magnetic shielding layer is less likely to break down and become loose.

[0024] The laminate layer can be disposed toward the outer surface of the magnetic shield member. For example, the laminate layer can be disposed radially outward from the magnetic shield layer. In one example, the laminate layer forms the outer surface of the magnetic shield member. However, in other examples, there can be a separate layer forming the outer surface. Here, the outer surface is the surface farthest from the inductor coil. The laminate layer can be attached to the magnetic shield layer via an adhesive or can be self-adhesive to the magnetic shield layer.

[0025] In one example, the laminate layer comprises a plastic material. The laminate layer can be, for example, a plastic film. In a particular example, the plastic is polyethylene terephthalate (PET).

[0026] The magnetic shielding member can have a thickness of about 0.1 mm to about 5 mm. Preferably, the thickness is about 0.5 mm to about 0.8 mm. This range provides a good balance between increasing the gap size between the device and the outer cover, reducing the device's mass (by making it thinner), and ensuring adequate absorption of electromagnetic radiation (by making it thicker).

[0027] The magnetic shielding member can be formed from a sheet and can include notches on the sheet, the notches configured to receive sections of wire forming the inductor coil. The sections of wire can include, for example, the ends of the inductor coil. The inclusion of one or more notches allows the magnetic shielding member to better fit the inductor coil. The notches / cutouts mean that the sheet can be more easily wrapped around the inductor coil while ensuring greater shielding effectiveness. The notches are indentations made in the edges of the sheet.

[0028] The sheet can be a square / rectangular sheet with one or more notches "cut" into it. For example, a rectangular sheet can be subjected to a "notching" process in which material is removed. Alternatively, the sheet can be manufactured with the notches pre-formed.

[0029] The aerosol delivery device may further include a second inductor coil adjacent to the inductor coil, and the sheet may include a second notch formed thereon. The second notch is configured to receive a section of wire forming the second inductor coil. The inclusion of the additional notch allows the magnetic shield member to better fit the two inductor coils.

[0030] In a particular example, the notch may be a first notch formed at a first edge of the sheet, and the second notch may be formed at a second edge of the sheet. Having the notches formed at different edges may make it easier to apply the magnetic shielding member to the inductor coil. For example, during assembly, the first notch may be aligned with the first inductor coil before being wrapped around the inductor coil, with the second notch receiving the second inductor coil.

[0031] The first notch can be offset from the second notch along the longitudinal axis defined by the receptacle / susceptor, which can make the device easier to assemble due to the offset of the notches. For example, the notches can ensure that the sheet can only be wrapped around the coil in the correct manner.

[0032] As mentioned above, notches are depressions made in the edges of the sheets. These allow the sheets to be wrapped around an inductor coil after assembly and connection to, for example, a printed circuit board. In another embodiment, the notches can be replaced by through holes / apertures, and the ends of the inductor coil can be received in the apertures. Such a configuration can provide better shielding compared to notches, but requires, for example, that a magnetic shielding material be wrapped around the inductor coil before the ends of the inductor coil are connected to the printed circuit board.

[0033] In some examples, the aerosol delivery device includes a susceptor, the susceptor defining a receptacle.

[0034] According to a second aspect, there is provided a magnetic shielding member for an aerosol delivery device. The magnetic shielding member can be formed from a sheet and includes a magnetic shielding layer, an adhesive layer applied to a first side of the magnetic shielding layer, and a laminate layer applied to a second side of the magnetic shielding layer. A first notch can be formed in the sheet, where the first notch is configured to receive a section of wire forming a first inductor coil of the aerosol delivery device, and a second notch can be formed in the sheet, where the second notch is configured to receive a section of wire forming a second inductor coil of the aerosol delivery device.

[0035] In some examples, a second adhesive layer can be disposed between the laminate layer and the shielding layer.

[0036] The first notch can be offset from the second notch in a direction along an axis defined by the sheet, the axis being parallel to an axis defined by the receptacle / susceptor when the sheet is disposed in a device.

[0037] The first notch can be formed at a first edge of the sheet and the second notch can be formed at a second edge of the sheet. In an alternative example, the notches can be formed along the same edge of the sheet.

[0038] In certain examples, the sheet includes four notches. For example, the sheet can further include a third notch configured to receive a second section of wire forming a first inductor coil of the aerosol delivery device, and a fourth notch configured to receive a second section of wire forming a second inductor coil of the aerosol delivery device.

[0039] In some examples, the magnetic shielding member may not contact the inductor coil, but instead may be attached to the inner surface of the outer cover.

[0040] In some examples, the device includes two or more inductor coils positioned along the length of the susceptor, and between each adjacent inductor coil, the device includes a radially extending wall, such as a washer.

[0041] In some examples, the radially extending walls can extend at least partially around the susceptor to separate each inductor. It has been found that such radially extending walls act to decouple the induction coils, meaning that each coil operates independently, i.e., there is no or reduced induced effect in nearby, inactive coils. Thus, the magnetic flux from each inductor coil can be more localized. In some examples, the walls can help direct / focus energy within the article at the location of the wall, which can mean that the total number of coils can be reduced. The radially extending walls can act as a collar around the susceptor. The radially extending walls can be coaxial with the susceptor. Radially extending can mean that the walls extend in a direction parallel to the radius of the tubular susceptor.

[0042] In some examples, the wall is attached to (i.e., in contact with) the susceptor. For example, the wall can extend from the susceptor to the inductor coil. In other examples, the wall is not attached to the susceptor. For example, the wall can extend from the outer surface of the insulating member. In one example, the wall and the susceptor are made of the same material. In a particular example, the wall includes ferrite.

[0043] Thus, in one example, an aerosol delivery device is provided that includes a susceptor, a first inductor coil extending around a first region of the susceptor, and a second inductor coil extending around a second region of the susceptor, the device further including a radially extending magnetic shield member disposed between the first inductor coil and the second inductor coil, the magnetic shield member and the device can include any of the features described above and herein.

[0044] As described above, the magnetic shield member configuration creates a thermal barrier between the hot susceptor and the outer casing / housing of the device. Preferably, the device's outer cover is maintained below 48°C. Even more preferably, the device's outer cover is maintained below 45°C or below 43°C during use. In some examples, the device's outer cover is maintained below 43°C for at least three or four consecutive heating sessions. A session involves heating the article for a period of about 3 minutes to about 4 minutes until the aerosol-generating material is expended. The use of a magnetic shield member in the inductor coil has been found to reduce the surface temperature of the outer cover by up to 3°C. Additional or alternative insulating features, such as the use of an air gap between the susceptor and the insulating member, can also maintain the temperature of the outer cover below about 48°C.

[0045] Thus, in another aspect, an aerosol delivery device includes an inductor coil configured to heat an aerosol-generating material and a susceptor, the inductor coil being positioned to heat the susceptor. The device includes an outer cover forming at least a portion of an exterior surface of the aerosol delivery device, the outer surface of the outer cover being positioned away from the outer surface of the susceptor. During use, the temperature of the exterior surface remains below about 48°C.

[0046] Thus, the device remains below about 48°C over at least one heating session.

[0047] Preferably, during use, the temperature of the exterior surface remains below about 43°C.

[0048] Preferably, in use, the temperature of the exterior surface remains below about 43°C for a period of at least three heating sessions, with the heating sessions lasting at least 180 seconds. Thus, in use, the temperature of the exterior surface remains below about 43°C for a period of at least 540 seconds. A heating session means that the susceptor is heated continuously during this time. In some examples, the average temperature of the susceptor during a heating session is about 240°C to about 300°C. Preferably, the heating sessions are performed consecutively (i.e., starting within less than about 30 seconds, or less than about 20 seconds, or less than about 10 seconds of each other).

[0049] More preferably, in use, the temperature of the exterior surface remains below about 43°C for a period of at least four heating sessions.

[0050] In some instances, the heating session lasts for at least 210 seconds.

[0051] The device may further comprise a magnetic shielding member in contact with and extending at least partially around the coil, The magnetic shielding member may include any or all of the features described above with respect to the first and second aspects.

[0052] The device can further include an insulating member extending around the susceptor. The insulating member can help maintain a temperature of the outer surface below about 48° C. In some examples, the insulating member is spaced apart from the susceptor to provide an air gap around the susceptor. The air gap provides an additional thermal barrier.

[0053] The insulating member can have a thickness of about 0.25 mm to about 1 mm. The insulating member (and any gap between the susceptor and the insulating member) helps to insulate the outer cover from the heated susceptor.

[0054] The insulating member can be constructed from any insulating material, such as, for example, plastic. In a particular example, the insulating member is constructed from polyetheretherketone (PEEK). PEEK has good insulating properties and is well suited for use in aerosol delivery devices.

[0055] In another example, the insulating member may include mica or mica glass ceramic, which have good insulating properties.

[0056] The insulating member may have a thermal conductivity of less than about 0.5 W / mK, or less than about 0.4 W / mK. For example, the thermal conductivity may be about 0.3 W / mK. PEEK has a thermal conductivity of about 0.32 W / mK.

[0057] The insulating member can have a melting point above about 320° C., or above about 340° C., such as above about 300° C. PEEK has a melting point of 343° C. An insulating member with such a melting point ensures that the insulating member remains rigid / solid when the susceptor is heated.

[0058] The inner surface of the outer cover can be spaced from the outer surface of the insulating member by a distance of about 2 mm to about 3 mm. This size separation distance has been found to provide sufficient insulation to ensure that the outer cover does not become too hot. Air can be placed between the outside of the insulating member and the outer cover.

[0059] More particularly, the inner surface of the outer cover can be spaced from the outer surface of the insulating member by a distance of about 2 mm to about 2.5 mm, such as about 2.3 mm, which provides a good balance between providing insulation and reducing the size of the device.

[0060] The inner surface of the outer cover can be spaced from the outer surface of the susceptor by a distance of about 4 mm to about 6 mm. This distance is the distance between the outer surface of the susceptor and the inner surface of the outer cover at the closest point. Therefore, this distance can be the minimum distance between the outer surface of the susceptor and the inner surface of the outer cover. In one example, the distance can be measured between the susceptor and the side of the device. It has been found that when the outer cover is spaced from the susceptor by this distance, the outer cover is sufficiently insulated from the heated susceptor to maintain a surface temperature below 48°C while reducing the size and weight of the device. Therefore, a distance within this range represents a good balance between insulating properties and device dimensions.

[0061] In one example, the inner surface of the outer cover is spaced from the outer surface of the susceptor by a distance of about 5 mm to about 6 mm. Preferably, the inner surface of the outer cover is spaced from the outer surface of the susceptor by a distance of about 5 mm to about 5.5 mm, such as about 5.3 mm to about 5.4 mm. Spacing within this distance range provides better insulation while also ensuring that the device remains compact and lightweight. In a specific example, the spacing is 5.3 mm.

[0062] The device may further comprise at least one insulating layer disposed between the outer cover and the susceptor, the insulating layer insulating the outer cover from the susceptor.

[0063] The insulating layer can be located in any or all of the following locations: (i) between the susceptor and the insulating member, (ii) between the insulating member and the coil, and (iii) between the coil and the outer cover. In (ii), the insulating member can have a smaller outer diameter to accommodate the insulating layer. Additionally or alternatively, the coil can have a larger inner diameter to accommodate the insulating layer. The insulating layer can include multiple layers of material.

[0064] The insulating layer may be provided by any of the following materials: (i) air (having a thermal conductivity of about 0.02 W / mK), (ii) AeroZero® (having a thermal conductivity of about 0.03 W / mK to about 0.04 W / m), (iii) polyetheretherketone (PEEK) (which in some instances may have a thermal conductivity of about 0.25 W / mK), (iv) ceramic cloth (having a specific heat of about 1.13 kJ / kgK), or (v) thermally conductive putty.

[0065] In some examples, the outer surface of the outer cover includes a coating. The coating and / or the outer cover can have a high thermal conductivity. For example, the conductivity can be greater than about 200 W / mK. The relatively high thermal conductivity ensures that heat is dispersed throughout the outer cover and lost to the atmosphere, thereby cooling the device. In certain examples, the coating is a soft-touch paint.

[0066] In some examples, the device includes a temperature sensor positioned to measure the battery temperature. The device can include a controller configured to cause the device to stop heating when the battery temperature is at or above a threshold temperature. For example, the threshold temperature can be approximately 45°C or 50°C.

[0067] The inner surface of the outer cover can be spaced from the outer surface of the susceptor by a distance of about 4 mm to about 6 mm. This distance is the distance between the outer surface of the susceptor and the inner surface of the outer cover at the closest point. Therefore, this distance can be the minimum distance between the outer surface of the susceptor and the inner surface of the outer cover. In one example, the distance can be measured between the susceptor and the side of the device. It has been found that when the outer cover is spaced from the susceptor by this distance, the outer cover is sufficiently insulated from the heated susceptor to avoid discomfort or injury to the user while reducing the size and weight of the device. Therefore, a distance within this range represents a good balance between insulating properties and device dimensions.

[0068] The outer cover, sometimes known as the outer casing, can completely surround the device or can extend partially around the device.

[0069] In one example, the inner surface of the outer cover is spaced from the outer surface of the susceptor by a distance of about 5 mm to about 6 mm. Preferably, the inner surface of the outer cover is spaced from the outer surface of the susceptor by a distance of about 5 mm to about 5.5 mm, such as about 5.3 mm to about 5.4 mm. Spacing within this distance range provides better insulation while also ensuring that the device remains compact and lightweight. In a specific example, the spacing is 5.3 mm.

[0070] In some examples, during use, the coil is configured to heat the susceptor to a temperature of about 240° C. to about 300° C., such as about 250° C. to about 280° C. When the outer cover is spaced at least this distance from the susceptor, the temperature of the outer cover is maintained at a safe level, such as below about 48° C., or below about 43° C.

[0071] In some instances, an air gap is formed between the coil and the outer cover, the air gap providing insulation.

[0072] The inner surface of the outer cover can be spaced from the outer surface of the coil by a distance of about 0.2 mm to about 1 mm. In some examples, when the coil is used to induce a magnetic field, the coil itself can heat up, for example, from resistive heating caused by current passing through the coil to induce the magnetic field. Providing a gap between the coil and the outer cover ensures that the heated coil is insulated from the outer cover. In some examples, a ferrite shield is disposed between the inner surface of the outer cover and the coil. The ferrite shield further helps to insulate the inner surface of the outer cover. It has been found that when the ferrite shield is in contact with and at least partially surrounds the one or more coils, the surface temperature of the outer cover can be reduced by about 3°C.

[0073] In one example, the coil comprises Litz wire, the Litz wire having a circular cross-section, and in such an example, the inner surface of the outer cover is spaced from the outer surface of the coil by a distance of about 0.2 mm to about 0.5 mm, or about 0.2 mm to about 0.3 mm, such as about 0.25 mm.

[0074] In one example, the coil comprises litz wire, the litz wire having a rectangular cross-section. In such an example, the inner surface of the outer cover is spaced from the outer surface of the coil by a distance of about 0.5 mm to about 1 mm, or about 0.8 mm to about 1 mm, such as about 0.9 mm. Litz wire with a circular cross-section can be positioned closer to the outer cover than litz wire with a rectangular cross-section because the circular cross-section wire has less surface area exposed to the outer cover.

[0075] The inner surface of the coil can be spaced from the outer surface of the susceptor by a distance of about 3 mm to about 4 mm.

[0076] The outer cover can comprise aluminum. Aluminum has good heat dissipation properties. The outer cover can have a thermal conductivity of about 200 W / mK to about 220 W / mK. For example, aluminum has a thermal conductivity of about 209 W / mK. Thus, the outer cover can have a relatively high thermal conductivity to ensure that heat is dispersed throughout the outer cover and lost to the atmosphere, thereby cooling the device.

[0077] The outer cover can have a thickness of about 0.75 mm to about 2 mm. Thus, the outer cover can act as an insulating barrier. These thicknesses provide a good balance between providing good insulation and reducing the size and weight of the device. Preferably, the outer cover has a thickness of about 0.75 mm to about 1.25 mm, such as about 1 mm.

[0078] 1 shows an example of an aerosol delivery device 100 for generating an aerosol from an aerosol-generating medium / material. In general, device 100 can be used to heat a replaceable article 110 comprising an aerosol-generating medium to generate an aerosol or other inhalable medium that is inhaled by a user of device 100.

[0079] The device 100 comprises a housing 102 (in the form of an outer cover) that encloses and contains the various components of the device 100. The device 100 has an opening 104 at one end through which an item 110 can be inserted for heating by a heating assembly. In use, the item 110 can be fully or partially inserted into the heating assembly where it can be heated by one or more components of the heater assembly.

[0080] The device 100 in this example includes a first end member 106 with a lid 108 that is movable relative to the first end member 106 to close the opening 104 when the item 110 is not in place. In Figure 1, the lid 108 is shown in an open configuration, but the lid 108 is movable to a closed configuration. For example, a user can slide the lid 108 in the direction of arrow "A."

[0081] Device 100 may also include a user-operable control element 112, such as a button or switch, that, when pressed, operates device 100. For example, a user may turn device 100 on by operating switch 112.

[0082] Device 100 may also include electrical components such as a socket / port 114 that can receive a cable for charging a battery in device 100. For example, socket 114 may be a charging port, such as a USB charging port.

[0083] 2 shows the device 100 of FIG. 1 with the outer cover 102 removed and without the article 110. The device 100 defines a longitudinal axis 134.

[0084] 2, first end member 106 is disposed at one end of device 100, and second end member 116 is disposed at the opposite end of device 100. First end member 106 and second end member 116 together at least partially define an end surface of device 100. For example, the bottom surface of second end member 116 at least partially defines the bottom surface of device 100. An edge of outer cover 102 can also define a portion of the end surface. In this example, lid 108 also defines a portion of the top surface of device 100.

[0085] The end of the device nearest opening 104 is sometimes known as the proximal end (mouth end) of device 100 because it is closest to the user's mouth during use. During use, a user inserts item 110 into opening 104, operates user control 112 to initiate heating of the aerosol-generating material, and inhales the aerosol generated within the device, causing the aerosol to flow through device 100 along a flow path toward the proximal end of device 100.

[0086] The other end of the device furthest from opening 104 may be known as the distal end of device 100, as it is the end furthest from a user's mouth during use. When a user inhales the aerosol generated within the device, the aerosol flows away from the distal end of device 100.

[0087] Device 100 further includes a power source 118. Power source 118 can be, for example, a battery, such as a rechargeable or non-rechargeable battery. Examples of suitable batteries include, for example, lithium batteries (e.g., lithium-ion batteries), nickel batteries (e.g., nickel-cadmium batteries), and alkaline batteries. The battery is electrically coupled to the heater assembly to provide power to heat the aerosol-forming material when needed under the control of a controller (not shown). In this example, the battery is connected to a central support 120 that holds battery 118 in place.

[0088] The device further includes at least one electronics module 122. The electronics module 122 may include, for example, a printed circuit board (PCB). The PCB 122 may support at least one controller, such as a processor, and a memory. The PCB 122 may also include one or more electrical tracks for electrically connecting the various electronic components of the device 100 together. For example, battery terminals may be electrically connected to the PCB 122 so that power can be distributed throughout the device 100. The socket 114 may also be electrically coupled to a battery via electrical tracks.

[0089] In the exemplary device 100, the heating assembly is an induction heating assembly and includes various components for heating the aerosol-generating material of the article 110 via an induction heating process. Induction heating is a process of heating a conductive object (such as a susceptor) by electromagnetic induction. The induction heating assembly can include an induction element, such as one or more inductor coils, and a device for passing a varying current, such as an alternating current, through the induction element. The varying current in the induction element generates a varying magnetic field. The varying magnetic field penetrates a susceptor appropriately positioned relative to the induction element and generates eddy currents within the susceptor. The susceptor has an electrical resistance to the eddy currents, and therefore, the flow of eddy currents against this resistance heats the susceptor by Joule heating. If the susceptor includes a ferromagnetic material, such as iron, nickel, or cobalt, heat can also be generated by magnetic hysteresis losses in the susceptor, i.e., by the varying orientation of magnetic dipoles in the magnetic material as a result of coordination with the varying magnetic field. In induction heating, heat is generated within the susceptor, allowing for faster heating, compared to heating by conduction, for example, and there is no need for physical contact between the induction heater and the susceptor, allowing for greater flexibility in construction and application.

[0090] The induction heating assembly of the exemplary device 100 includes a susceptor structure 132 (referred to herein as a "susceptor"), a first inductor coil 124, and a second inductor coil 126. The first inductor coil 124 and the second inductor coil 126 are made from a conductive material. In this example, the first inductor coil 124 and the second inductor coil 126 are made from litz wire / cable wound in a helical shape to provide the helical inductor coils 124, 126. The litz wire comprises multiple individual wires that are individually insulated and twisted together to form a single wire. The litz wire is designed to reduce skin effect losses in the conductor. In the exemplary device 100, the first inductor coil 124 and the second inductor coil 126 are made from copper litz wire having a rectangular cross-section. In other examples, the litz wire can have other cross-section shapes, such as circular.

[0091] The first inductor coil 124 is configured to generate a first varying magnetic field for heating a first section of the susceptor 132, and the second inductor coil 126 is configured to generate a second varying magnetic field for heating a second section of the susceptor 132. In this example, the first inductor coil 124 is adjacent to the second inductor coil 126 in a direction along the longitudinal axis 134 of the device 100 (i.e., the first inductor coil 124 and the second inductor coil 126 do not overlap). The susceptor structure 132 can include a single susceptor or two or more separate susceptors. Ends 130 of the first inductor coil 124 and the second inductor coil 126 can be connected to the PCB 122.

[0092] It will be appreciated that in some examples, the first inductor coil 124 and the second inductor coil 126 can have at least one characteristic that differs from one another. For example, the first inductor coil 124 can have at least one characteristic that differs from the second inductor coil 126. More specifically, in one example, the first inductor coil 124 can have a different inductance value than the second inductor coil 126. In FIG. 2 , the first inductor coil 124 and the second inductor coil 126 are of different lengths, such that the first inductor coil 124 is wound around a smaller section of the susceptor 132 than the second inductor coil 126. As such, the first inductor coil 124 can include a different number of turns than the second inductor coil 126 (assuming the spacing between individual turns is substantially the same). In yet another example, the first inductor coil 124 can be made of a different material than the second inductor coil 126. In some examples, the first inductor coil 124 and the second inductor coil 126 can be substantially identical.

[0093] In this example, the first inductor coil 124 and the second inductor coil 126 are wound in opposite directions. This can be useful when the inductor coils are active at different times. For example, initially, the first inductor coil 124 may be operating to heat a first section of the item 110, and at a later time, the second inductor coil 126 may be operating to heat a second section of the item 110. Winding the coils in opposite directions helps reduce current flow in inactive coils when used in conjunction with certain types of control circuitry. In FIG. 2, the first inductor coil 124 is a right-handed spiral and the second inductor coil 126 is a left-handed spiral. However, in other embodiments, the inductor coils 124, 126 can be wound in the same direction, or the first inductor coil 124 can be a left-handed spiral and the second inductor coil 126 can be a right-handed spiral.

[0094] The susceptor 132 in this example is hollow, thus defining a receptacle for receiving the aerosol-generating material therein. For example, the article 110 can be inserted into the susceptor 132. In this example, the susceptor 120 is tubular with a circular cross-section.

[0095] 2 further includes an insulating member 128 that may be generally tubular and at least partially surrounds the susceptor 132. The insulating member 128 may be constructed from any insulating material, such as, for example, plastic. In this particular example, the insulating member is constructed from polyetheretherketone (PEEK). The insulating member 128 may serve to insulate various components of the device 100 from heat generated within the susceptor 132.

[0096] The insulating member 128 can also fully or partially support the first inductor coil 124 and the second inductor coil 126. For example, as shown in FIG. 2 , the first inductor coil 124 and the second inductor coil 126 are disposed around the insulating member 128 and contact the radially outer surface of the insulating member 128. In some examples, the insulating member 128 does not abut the first inductor coil 124 and the second inductor coil 126. For example, there can be a small gap between the outer surface of the insulating member 128 and the inner surfaces of the first inductor coil 124 and the second inductor coil 126.

[0097] In a particular example, the susceptor 132 , the insulating member 128 , and the first and second inductor coils 124 , 126 are coaxial about a central longitudinal axis of the susceptor 132 .

[0098] 3 shows a side view, partially in cross section, of device 100, in this example with outer cover 102 present. The rectangular cross-sectional shapes of first inductor coil 124 and second inductor coil 126 are more clearly visible.

[0099] The device 100 further comprises a support 136 that engages one end of the susceptor 132 to hold the susceptor 132 in place. The support 136 is connected to the second end member 116.

[0100] The device may also include a second printed circuit board 138 associated within the control element 112 .

[0101] The device 100 further includes a second lid / cap 140 and a spring 142 disposed toward the distal end of the device 100. The spring 142 allows the second lid 140 to be opened, providing access to the susceptor 132. A user can open the second lid 140 and clean the susceptor 132 and / or the support 136.

[0102] The device 100 further comprises an expansion chamber 144 extending from the proximal end of the susceptor 132 toward the opening 104 of the device. A retention clip 146 is at least partially disposed within the expansion chamber 144 for abutting and retaining the article 110 when received within the device 100. The expansion chamber 144 is connected to the end member 106.

[0103] FIG. 4 is an exploded view of the device 100 of FIG. 1 with the outer cover 102 omitted.

[0104] Figure 5A shows a cross-sectional view of a portion of device 100 of Figure 1. Figure 5B shows a detailed view of the area of ​​Figure 5A. Figures 5A and 5B show article 110 received within susceptor 132, where article 110 is dimensioned so that the outer surface of article 110 abuts the inner surface of susceptor 132. This ensures the most efficient heating. In this example, article 110 includes aerosol-generating material 110a. Aerosol-generating material 110a is disposed within susceptor 132. Article 110 may also include other components, such as a filter, packaging material, and / or cooling structure.

[0105] 5B shows that the outer surface of the susceptor 132 is spaced from the inner surfaces of the inductor coils 124, 126 by a distance 150 measured in a direction perpendicular to the longitudinal axis 158 of the susceptor 132. In one particular example, the distance 150 is about 3 mm to 4 mm, about 3 mm to 3.5 mm, or about 3.25 mm.

[0106] 5B further shows that the outer surface of the insulating member 128 is spaced from the inner surfaces of the inductor coils 124, 126 by a distance 152 measured in a direction perpendicular to the longitudinal axis 158 of the susceptor 132. In one particular example, the distance 152 is approximately 0.05 mm. In another example, the distance 152 is substantially 0 mm, such that the inductor coils 124, 126 abut and contact the insulating member 128.

[0107] In one example, the susceptor 132 has a wall thickness 154 of between about 0.025 mm and 1 mm, or about 0.05 mm.

[0108] In one example, the susceptor 132 has a length of about 40 mm to 60 mm, about 40 mm to 45 mm, or about 44.5 mm.

[0109] In one example, the insulating member 128 has a wall thickness 156 of between about 0.25 mm and 2 mm, between 0.25 mm and 1 mm, or about 0.5 mm.

[0110] 6 shows a perspective view of a printed circuit board (PCB) 122, a susceptor 132, a first inductor coil 124, and a second inductor coil 126. In this example, the first inductor coil 124 and the second inductor coil 126 are made from wire having a circular cross-section. A first end 130a and a second end 130b of the first inductor coil 124 are connected to the PCB 122. Similarly, a first end 130c and a second end 130d of the second inductor coil 126 are connected to the PCB 122. In some examples, there may be only one inductor coil.

[0111] A magnetic shield member 202 extends around the first inductor coil 124 and the second inductor coil 126. The magnetic shield member 202 contacts and surrounds the first inductor coil 124 and the second inductor coil 126 to shield other components of the device 100 and / or other objects from electromagnetic radiation generated within the susceptor and / or the first inductor coil 124 and the second inductor coil 126. The magnetic shield member 202 is shown as transparent to clearly show the inductor coils 124, 125 and the susceptor 132 disposed within the magnetic shield member 202. In this example, the magnetic shield member 202 is held in place by an adhesive. In other examples, other features / components of the device 100 and / or the magnetic shield member 202 may hold the magnetic shield member 202 in place.

[0112] The susceptor 132 defines a receptacle configured to receive the article 110 and thus receive the aerosol-generating material. In other examples (not shown), the susceptor 132 is part of the article 110 rather than the device 100, so that other components may define the receptacle. The receptacle / susceptor 132 defines an axis 158, such as a longitudinal axis 158, about which the magnetic shield member 202 is wrapped.

[0113] The magnetic shielding member 202 includes one or more components that act as a shield against electromagnetic radiation. In this example, the magnetic shielding member 202 includes a magnetic shielding layer, such as a ferrite layer, that acts as a shield.

[0114] The magnetic shield member 202 may include one or more additional layers. For example, as illustrated in Figure 7, the magnetic shield member 202 may further include an adhesive layer and / or a laminate layer.

[0115] 7 is a diagrammatic representation of a cross section through exemplary magnetic shield member 202 before being wrapped around first inductor coil 123 and second inductor coil 126. Magnetic shield member 202 is in the form of a sheet.

[0116] In this example, the magnetic shield member 202 comprises at least three layers including a magnetic shield layer 206, an adhesive layer 204 applied to a first side of the magnetic shield layer 206, and a laminate layer 208 applied to a second side of the magnetic shield layer 206.

[0117] The adhesive layer 204 is disposed on the inner surface of the magnetic shield member 202 so that the magnetic shield member 202 can be adhered to the first inductor coil 124 and the second inductor coil 126. An additional protective layer (not shown) can cover the adhesive layer 204, which is then removed to expose the adhesive layer 204 before the magnetic shield member 202 is attached to the first inductor coil 124 and the second inductor coil 126. The inner surface of the magnetic shield member 202 is the surface closest to the first inductor coil 124 and the second inductor coil 126 when the magnetic shield member 202 is in contact with the first inductor coil 124 and the second inductor coil 126. When the magnetic shield member 202 is wrapped around the first inductor coil 124 and the second inductor coil 126, the magnetic shield member can overlap itself in the overlap region such that a portion of the adhesive layer 204 contacts the laminate layer 208.

[0118] The laminate layer 208 is disposed on or toward the outer surface of the magnetic shield member 202. The outer surface of the magnetic shield member 202 is the surface farthest from the first inductor coil 124 and the second inductor coil 126 when the magnetic shield member 202 is in contact with the first inductor coil 124 and the second inductor coil 126. In some examples, an additional layer (not shown) forms the outer surface of the magnetic shield member 202.

[0119] As mentioned above, the ferrite material in the magnetic shield layer 206 can break down over many heating and cooling cycles. The laminate layer 208 acts to stop the broken down material in the magnetic shield layer 206 from loosening and moving around inside the device 100. The laminate layer 208 can comprise a plastic material, such as a plastic film. In this example, the plastic is polyethylene terephthalate (PET).

[0120] 7, laminate layer 208 is directly adjacent to magnetic shield layer 206. For example, laminate layer 208 can be adhered to magnetic shield layer 206 by heat sealing. In another example, a second adhesive layer (not shown) can be disposed between laminate layer 208 and magnetic shield layer 206.

[0121] FIG. 8 shows a top view of the configuration shown in FIG. 6. A receptacle 212 defined by the susceptor 132 receives the aerosol-generating material therein. Arrows 210 indicate a radial direction pointing outward from the receptacle / susceptor. When the magnetic shield member 202 of FIG. 7 is wrapped around the first inductor coil 124 and the second inductor coil 126, the laminate layer 208 is positioned farther from the first inductor coil 124 and the second inductor coil 126 in the radial direction 210 than the adhesive layer 204.

[0122] 6 and 8, the first end 130a and second end 130b of the first inductor coil 124 pass through notches / openings / apertures formed in the magnetic shield member 202. These notches allow the magnetic shield member 202 to fit more closely with the first inductor coil 124 and second inductor coil 126.

[0123] 9 shows magnetic shield member 202 separated from other components. Sheet-like magnetic shield member 202 is rolled into a cylindrical tube and overlaps at overlap region 224. The presence of adhesive layer 204 means that magnetic shield member 202 can be adhered to itself at overlap region 224, thereby providing improved shielding. In other examples, magnetic shield member 202 does not extend completely around first inductor coil 124 and second inductor coil 126.

[0124] Magnetic shield member 202 includes four notches 214, 216, 218, and 220. In other examples, one or more notches may be present. Notches 214, 216, 218, and 220 are formed in the edge of magnetic shield member 202 and each receive a section of wire forming inductor coils 124 and 126. As shown in FIG. 6 , the sections of wire include first and second ends 130 a and 130 b of first inductor coil 124 and first and second ends 130 c and 130 d of second inductor coil 126.

[0125] 10 is a diagrammatic representation of the magnetic shield member 202 of FIG. 9 before being wrapped around the first inductor coil 124 and the second inductor coil 126. The magnetic shield member 202 is formed from a generally rectangular sheet. The sheet defines an axis 222 that is aligned parallel to the axis defined by the receptacle / susceptor 132 and the axis defined by the first inductor coil 124 and the second inductor coil 126 when the magnetic shield member 202 is wrapped around the inductor coils 124, 126.

[0126] The sheet includes a first notch 214 formed in a first edge 224 of the sheet. The first notch 214 receives a section of wire that forms the first inductor coil 124, the section of wire including the first end 130a. The sheet also includes a second notch 218 formed in the first edge 224 of the sheet. The second notch 218 receives a section of wire that forms the second inductor coil 126, the section of wire including the first end 130c. The sheet further includes a third notch 216 formed in a second edge 226 of the sheet. The third notch 216 receives a second section of wire that forms the first inductor coil 124, the second section of wire including the second end 130b. The sheet also includes a fourth notch 220 formed in the second edge 226 of the sheet. The fourth notch 220 receives the second section of wire that forms the second inductor coil 126, the second section of wire including the second end 130b, so that there are two notches formed in opposite edges of the sheet per inductor coil.

[0127] The notches 214, 216, 218, 220 are all offset from one another in a direction along the axis 222 defined by the sheet (and therefore are all offset from one another in a direction along the longitudinal axis 158 defined by the susceptor 132 when the magnetic shield member 202 is in place).

[0128] 11 is a diagrammatic representation of another exemplary magnetic shield member 302 that can be used in device 100. Magnetic shield member 302 is formed from a generally rectangular sheet. The sheet defines an axis 322 that is aligned parallel to the axis defined by receptacle / susceptor 132 and the axis defined by first inductor coil 124 and second inductor coil 126 when magnetic shield member 202 is wrapped around inductor coils 124, 126.

[0129] Unlike the example of FIG. 10 , magnetic shield member 302 includes a notch formed along one edge of the sheet. For example, sheet 302 includes a first notch 314 formed in first edge 324 of the sheet. First notch 314 receives a section of wire forming first inductor coil 124, the section of wire including first end 130 a. Sheet 302 also includes a second notch 318 formed in first edge 324 of the sheet. Second notch 318 receives a section of wire forming second inductor coil 126, the section of wire including first end 130 c. Sheet 302 also includes a third notch 316 formed in first edge 324 of the sheet. Third notch 316 receives a second section of wire forming first inductor coil 124, the second section of wire including second end 130 b. Sheet 302 also includes a fourth notch 320 formed in first edge 324 of the sheet. The fourth notch 320 receives the second section of wire forming the second inductor coil 126, the second section of wire including the second end 130b, so there are two notches formed in the same edge of the sheet per inductor coil.

[0130] The notches 314, 316, 318, 320 are all offset from one another in a direction along the axis 322 defined by the sheet (and therefore are all offset from one another in a direction along the longitudinal axis 158 defined by the susceptor 132 when the magnetic shield member 302 is in place).

[0131] 12 is a diagrammatic representation of another exemplary magnetic shield member 402 that can be used in device 100. Magnetic shield member 402 is formed from a generally rectangular sheet. The sheet defines an axis 422 that is aligned parallel to the axis defined by receptacle / susceptor 132 and the axis defined by first inductor coil 124 and second inductor coil 126 when magnetic shield member 202 is wrapped around inductor coils 124, 126.

[0132] 10 and 11, the magnetic shield member 402 has openings / apertures / through-holes formed in the sheet, so that the ends of the first inductor coil 124 and the second inductor coil 126 must first be threaded through the openings before being connected to the PCB 122.

[0133] The sheet includes a first aperture 414 that receives a section of wire that forms first inductor coil 124, the section of wire including first end 130a. The sheet also includes a second aperture 418 that receives a section of wire that forms second inductor coil 126, the section of wire including first end 130c. The sheet further includes a third aperture 416 that receives a second section of wire that forms first inductor coil 124, the second section of wire including second end 130b. The sheet further includes a fourth aperture 420 that receives a second section of wire that forms second inductor coil 126, the second section of wire including second end 130b.

[0134] The apertures 414, 416, 418, 420 are all offset from one another in a direction along the axis 422 defined by the sheet (and therefore are all offset from one another in a direction along the longitudinal axis 158 defined by the susceptor 132 when the magnetic shield member 302 is in place).

[0135] The above-described embodiments are to be understood as illustrative examples of the present invention. Further embodiments of the present invention are envisioned. It should be understood that any feature described in connection with any one embodiment may be used alone or in combination with other described features, and may also be used in combination with one or more features of any other embodiment or any combination of any other embodiments. Furthermore, equivalents and modifications not described above may also be employed without departing from the scope of the present invention, which is defined in the appended claims.

Claims

1. a receptacle configured to receive an aerosol-forming material, the aerosol-forming material being heatable by a susceptor; and an inductor coil extending around the receptacle, the inductor coil configured to generate a varying magnetic field for heating the susceptor; a magnetic shield member extending at least partially around the inductor coil; An aerosol delivery device comprising:

2. The aerosol delivery device of claim 1 , wherein the magnetic shielding member is in contact with the inductor coil.

3. The aerosol delivery device of claim 2 , wherein the magnetic shielding member is adhered to the inductor coil by an adhesive layer.

4. The aerosol delivery device of claim 3 , wherein the magnetic shielding member comprises the adhesive layer.

5. The aerosol delivery device of any one of claims 1 to 4, wherein the magnetic shielding member is wrapped around the inductor coil and is at least partially glued to itself.

6. The aerosol delivery device of any one of claims 1 to 5, wherein the magnetic shielding member comprises at least one magnetic shielding layer and at least one laminate layer.

7. The aerosol delivery device of claim 6 , wherein the laminate layer comprises a plastic material.

8. 8. The aerosol delivery device of claim 7, wherein the plastic is polyethylene terephthalate.

9. The magnetic shield member is formed from a sheet, 9. The aerosol delivery device of claim 1, further comprising a notch formed in the sheet, the notch configured to receive a section of wire forming the inductor coil.

10. the aerosol delivery device further comprising a second inductor coil adjacent to the inductor coil; the sheet includes a second notch formed thereon; The aerosol delivery device of claim 9 , wherein the second notch is configured to receive a section of wire forming the second inductor coil.

11. The aerosol delivery device of claim 10 , wherein the notch is offset from the second notch in a direction along a longitudinal axis defined by the receptacle.

12. The aerosol delivery device of any one of claims 1 to 11, further comprising the susceptor, the susceptor defining the receptacle.

13. 13. The aerosol delivery device of claim 1, further comprising an outer cover forming at least a portion of an outer surface of the aerosol delivery device, the outer surface of the outer cover being positioned away from an outer surface of the susceptor, and wherein, in use, the temperature of the outer surface remains below about 48°C.

14. An aerosol delivery device according to any one of claims 1 to 13; an article comprising an aerosol-forming material; An aerosol delivery system comprising:

15. 1. A magnetic shielding member for an aerosol delivery device, the magnetic shielding member being formed from a sheet; a magnetic shield layer; an adhesive layer applied to a first side of the magnetic shield layer; a laminate layer applied to a second side of the magnetic shield layer; a first notch formed in the sheet, the first notch configured to receive a section of wire forming a first inductor coil of the aerosol delivery device; a second notch formed in the sheet, the second notch configured to receive a section of wire forming a second inductor coil of the aerosol delivery device; and A magnetic shield member comprising:

16. 16. The magnetic shield member of claim 15, wherein the first notch is offset from the second notch in a direction along an axis defined by the sheet.

17. 17. The magnetic shield member according to claim 15 or 16, wherein the first notch is formed in a first edge of the sheet and the second notch is formed in a second edge of the sheet.

18. 1. An aerosol delivery device comprising: a susceptor positioned to heat the aerosol-generating material; an inductor coil extending around the susceptor, the inductor coil configured to generate a varying magnetic field for heating the susceptor; an outer cover forming at least a portion of an outer surface of the aerosol delivery device, the outer surface of the outer cover being spaced apart from an outer surface of the susceptor; Equipped with An aerosol delivery device wherein, in use, the temperature of the exterior surface remains below about 48°C.

19. 20. The aerosol delivery device of claim 18, wherein, in use, the temperature of the exterior surface remains below about 43°C.

20. 20. The aerosol delivery device of claim 19, wherein, in use, the temperature of the exterior surface remains below about 43°C for a period of at least three heating sessions, the heating sessions lasting at least 180 seconds.

21. 21. The aerosol delivery device of claim 20, wherein, in use, the temperature of the exterior surface remains below about 43°C for a period of at least four heating sessions.

22. 22. The aerosol delivery device of claim 20 or 21, wherein the heating session lasts for at least 210 seconds.

23. The aerosol delivery device of any one of claims 18 to 22, further comprising a magnetic shielding member in contact with and extending at least partially around the inductor coil.

24. The aerosol delivery device of any one of claims 18 to 23, further comprising an insulating member extending around the susceptor.

25. 10. The aerosol delivery device of claim 9, wherein the insulating member is spaced apart from the susceptor to provide an air gap around the susceptor.

26. The aerosol delivery device of any one of claims 18 to 25, further comprising at least one insulating layer disposed between the outer cover and the susceptor.

27. The aerosol delivery device of any one of claims 18 to 26, wherein the exterior surface of the outer cover comprises a coating.

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