Aerosol generating device and heater for aerosol generating device

Abstract

The utility model provides an aerosol generating device and a heater for the aerosol generating device. The aerial fog generating device comprises a chamber and a heater, the heater comprises a first end and a second end which are opposite to each other, and a first heating element and a second heating element which are arranged at intervals from the first end to the second end; a first interdigital electrode including a first interdigital portion on the first heating element; a second interdigital electrode including a second interdigital portion on the first heating element and a third interdigital portion on the second heating element; the first interdigital parts and the second interdigital parts are alternately arranged; a third interdigital electrode including a fourth interdigital portion on the second heating element; the third interdigital parts and the fourth interdigital parts are alternately arranged; the sum of the number of the first interdigital parts and the number of the second interdigital parts is smaller than the sum of the number of the third interdigital parts and the number of the fourth interdigital parts. According to the aerial fog generating device, the temperature field distribution in the first heating element and the second heating element can be selectively adjusted through the arrangement mode of the interdigital electrodes.

Description

Technical Field

[0001] This application relates to the field of heated non-combustible aerosol generation technology, and in particular to an aerosol generation device and a heater for the aerosol generation device. Background Technology

[0002] Tobacco products (such as cigarettes, cigars, etc.) produce tobacco smoke by burning tobacco during use. Efforts are being made to replace these tobacco-burning products by creating products that release compounds without combustion.

[0003] Examples of such products are heating devices that release compounds by heating rather than burning materials. For example, the material could be an aerosol-generating article from tobacco or other non-tobacco products, which may or may not contain nicotine. Known heating devices, in order to heat the aerosol-generating article to a temperature capable of releasing volatile components that can form aerosols, typically involve surrounding the aerosol-generating article with a tubular substrate and forming or distributing a resistive or infrared heating coating on the outside of the tubular substrate. The aerosol is generated by heating the aerosol-generating article within the tubular substrate through resistive Joule heating or infrared radiation. Utility Model Content

[0004] One embodiment of this application provides an aerosol generating apparatus configured to heat an aerosol generating article to generate an aerosol; comprising:

[0005] A chamber for receiving aerosol-generated products;

[0006] A heater for heating aerosol-generating products; the heater includes:

[0007] The first and second ends, which are opposite to each other in the longitudinal direction;

[0008] A first heating element and a second heating element are arranged longitudinally from the first end to the second end at intervals, and at least partially surround the chamber;

[0009] The first interdigital electrode includes at least one first interdigital portion that extends along the longitudinal direction on the first heating element;

[0010] The second interdigital electrode includes at least one second interdigital portion extending along the longitudinal direction on the first heating element, and at least one third interdigital portion extending along the longitudinal direction on the second heating element; the first interdigital portion and the second interdigital portion are alternately arranged in the circumferential direction of the first heating element.

[0011] The third interdigital electrode includes at least one fourth interdigital portion extending along the longitudinal direction on the second heating element; the third interdigital portion and the fourth interdigital portion are alternately arranged in the circumferential direction of the second heating element;

[0012] The sum of the number of the first interdigitated portion and the second interdigitated portion is less than the sum of the number of the third interdigitated portion and the fourth interdigitated portion.

[0013] In some embodiments, the area of ​​the first heating element covered by the first interdigitated portion and the second interdigitated portion is smaller than the area of ​​the second heating element covered by the third interdigitated portion and the fourth interdigitated portion.

[0014] In some embodiments, the number of the first interdigital portion and / or the second interdigital portion is less than the number of the third interdigital portion and / or the fourth interdigital portion.

[0015] In some embodiments, the width of the first interdigital portion and / or the second interdigital portion is smaller than the width of the third interdigital portion and / or the fourth interdigital portion.

[0016] In some embodiments, the chamber has an opening; in use, the aerosol-generating article can be received into or removed from the chamber through the opening.

[0017] The first end is positioned close to or toward the opening.

[0018] In some embodiments, it also includes:

[0019] Battery cell and circuit board; wherein the circuit board is configured as follows:

[0020] In the first time phase, the first interdigital electrode and the second interdigital electrode are connected to the positive and negative terminals of the battery cell, respectively, to control the heating of the first heating element;

[0021] In the second time phase, the first interdigital electrode and the third interdigital electrode are simultaneously connected to one of the positive and negative terminals of the battery cell, and the second interdigital electrode is connected to the other of the positive and negative terminals of the battery cell, so as to control the first heating element and the second heating element to heat simultaneously.

[0022] In some embodiments, the first heating element and the second heating element have the same extension dimension in the longitudinal direction of the heater;

[0023] Alternatively, the longitudinal extension dimension of the first heating element in the heater is smaller than the longitudinal extension dimension of the second heating element in the heater.

[0024] In some embodiments, the first heating element has a first extension dimension along the longitudinal direction of the heater, and the second heating element has a second extension dimension along the longitudinal direction of the heater; the ratio of the first extension dimension to the second extension dimension is between 1:9 and 4.5:5.5.

[0025] In some embodiments, the second interdigitated portion and the third interdigitated portion are arranged staggered in the longitudinal direction of the heater.

[0026] In some embodiments, the first interdigital electrode further includes a first base located between the first heating element and the first end, the first interdigital portion being arranged to extend from the first base toward the second end;

[0027] And / or, the second interdigital electrode further includes a second base located between the first heating element and the second heating element, the second interdigital portion being arranged to extend from the second base toward the first end, and the third interdigital portion being arranged to extend from the second base toward the second end;

[0028] And / or, the third interdigital electrode further includes a third base located between the second heating element and the second end, and the fourth interdigital portion is arranged to extend from the third base toward the first end.

[0029] In some embodiments, the first base is substantially annular around the chamber;

[0030] And / or, the second base is substantially annular around the chamber;

[0031] And / or, a notch is defined on the third base, thereby making the third base non-closed in the circumferential direction of the heater; one of the third interdigitates passes through the notch in the longitudinal direction of the heater.

[0032] Another embodiment of this application also proposes an aerosol generating device, configured to heat an aerosol generating article to generate an aerosol; comprising:

[0033] A chamber for receiving aerosol-generated products;

[0034] A heater for heating aerosol-generating products; the heater includes:

[0035] The first and second ends, which are opposite to each other in the longitudinal direction;

[0036] A first heating element and a second heating element are arranged longitudinally from the first end to the second end at intervals, and at least partially surround the chamber;

[0037] The first interdigital electrode includes at least one first interdigital portion that extends along the longitudinal direction on the first heating element;

[0038] The second interdigital electrode includes at least one second interdigital portion extending along the longitudinal direction on the first heating element, and at least one third interdigital portion extending along the longitudinal direction on the second heating element; the first interdigital portion and the second interdigital portion are alternately arranged in the circumferential direction of the first heating element.

[0039] The third interdigital electrode includes at least one fourth interdigital portion extending along the longitudinal direction on the second heating element; the third interdigital portion and the fourth interdigital portion are alternately arranged in the circumferential direction of the second heating element;

[0040] The area of ​​the first heating element covered by the first interdigitated portion and the second interdigitated portion is smaller than the area of ​​the second heating element covered by the third interdigitated portion and the fourth interdigitated portion.

[0041] Another embodiment of this application also proposes an aerosol generating device, configured to heat an aerosol generating article to generate an aerosol; comprising:

[0042] The chamber has an opening; in use, the aerosol-generated article can be received into or removed from the chamber through the opening.

[0043] A heater for heating aerosol-generating products; the heater includes:

[0044] The first end facing the opening, and the second end longitudinally opposite to the first end;

[0045] A first heating element and a second heating element are arranged longitudinally from the first end to the second end at intervals, and at least partially surround the chamber; the longitudinal extension dimension of the first heating element in the heater is smaller than the longitudinal extension dimension of the second heating element in the heater.

[0046] The first interdigital electrode includes at least one first interdigital portion that extends along the longitudinal direction on the first heating element;

[0047] The second interdigital electrode includes at least one second interdigital portion extending along the longitudinal direction on the first heating element, and at least one third interdigital portion extending along the longitudinal direction on the second heating element; the first interdigital portion and the second interdigital portion are alternately arranged in the circumferential direction of the first heating element.

[0048] The third interdigital electrode includes at least one fourth interdigital portion extending along the longitudinal direction on the second heating element; the third interdigital portion and the fourth interdigital portion are alternately arranged in the circumferential direction of the second heating element.

[0049] Another embodiment of this application provides a heater for an aerosol generating device, comprising:

[0050] The first and second ends, which are opposite to each other in the longitudinal direction;

[0051] A first heating element and a second heating element are arranged longitudinally from the first end to the second end at intervals, and at least partially surround the chamber;

[0052] The first interdigital electrode includes at least one first interdigital portion that extends along the longitudinal direction on the first heating element;

[0053] The second interdigital electrode includes at least one second interdigital portion extending along the longitudinal direction on the first heating element, and at least one third interdigital portion extending along the longitudinal direction on the second heating element; the first interdigital portion and the second interdigital portion are alternately arranged in the circumferential direction of the first heating element.

[0054] The third interdigital electrode includes at least one fourth interdigital portion extending along the longitudinal direction on the second heating element; the third interdigital portion and the fourth interdigital portion are alternately arranged in the circumferential direction of the second heating element;

[0055] The sum of the number of the first interdigitated portion and the second interdigitated portion is less than the sum of the number of the third interdigitated portion and the fourth interdigitated portion.

[0056] Another embodiment of this application provides a heater for an aerosol generating device, comprising:

[0057] The first and second ends, which are opposite to each other in the longitudinal direction;

[0058] A first heating element and a second heating element are arranged longitudinally from the first end to the second end at intervals, and at least partially surround the chamber;

[0059] The first interdigital electrode includes at least one first interdigital portion that extends along the longitudinal direction on the first heating element;

[0060] The second interdigital electrode includes at least one second interdigital portion extending along the longitudinal direction on the first heating element, and at least one third interdigital portion extending along the longitudinal direction on the second heating element; the first interdigital portion and the second interdigital portion are alternately arranged in the circumferential direction of the first heating element.

[0061] The third interdigital electrode includes at least one fourth interdigital portion extending along the longitudinal direction on the second heating element; the third interdigital portion and the fourth interdigital portion are alternately arranged in the circumferential direction of the second heating element;

[0062] The area of ​​the first heating element covered by the first interdigitated portion and the second interdigitated portion is smaller than the area of ​​the second heating element covered by the third interdigitated portion and the fourth interdigitated portion.

[0063] Another embodiment of this application provides a heater for an aerosol generating device, comprising:

[0064] The first and second ends, which are opposite to each other in the longitudinal direction;

[0065] A first heating element and a second heating element are arranged longitudinally from the first end to the second end at intervals, and at least partially surround the chamber; the longitudinal extension dimension of the first heating element in the heater is smaller than the longitudinal extension dimension of the second heating element in the heater.

[0066] The first interdigital electrode includes at least one first interdigital portion that extends along the longitudinal direction on the first heating element;

[0067] The second interdigital electrode includes at least one second interdigital portion extending along the longitudinal direction on the first heating element, and at least one third interdigital portion extending along the longitudinal direction on the second heating element; the first interdigital portion and the second interdigital portion are alternately arranged in the circumferential direction of the first heating element.

[0068] The third interdigital electrode includes at least one fourth interdigital portion extending along the longitudinal direction on the second heating element; the third interdigital portion and the fourth interdigital portion are alternately arranged in the circumferential direction of the second heating element.

[0069] The above-mentioned aerosol generating device can selectively adjust or change the temperature field distribution during the operation of the first heating element and the second heating element of the heater by means of the arrangement of the interdigitated electrodes. Attached Figure Description

[0070] One or more embodiments are illustrated by way of example with reference numerals in the accompanying drawings. These illustrations do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are denoted as similar elements. Unless otherwise stated, the figures in the drawings are not to be limited by scale.

[0071] Figure 1 This is a schematic diagram of an aerosol generating device provided in one embodiment;

[0072] Figure 2 This is a schematic diagram of the heater from one perspective of one embodiment;

[0073] Figure 3 yes Figure 2 An exploded view of the heater from one perspective;

[0074] Figure 4 yes Figure 2 A schematic diagram of the circumferentially unfolded central heater;

[0075] Figure 5 This is a schematic diagram of the heater from one perspective of yet another embodiment;

[0076] Figure 6 yes Figure 5 An exploded view of the heater from one perspective;

[0077] Figure 7 yes Figure 5 A schematic diagram of the circumferentially unfolded central heater;

[0078] Figure 8 This is a schematic diagram of the heater from one perspective of yet another embodiment;

[0079] Figure 9 yes Figure 8 A schematic diagram of the circumferentially unfolded central heater;

[0080] Figure 10 This is a schematic diagram of the heater from one perspective of yet another embodiment;

[0081] Figure 11 yes Figure 10 A schematic diagram of the circumferentially unfolded heater. Detailed Implementation

[0082] To facilitate understanding of this application, a more detailed description of this application will be provided below in conjunction with the accompanying drawings and specific embodiments.

[0083] One embodiment of this application provides an aerosol generating device 100 that heats, rather than burns, an aerosol generating article 100, such as a cigarette, to cause at least one component of the aerosol generating article 1000 to volatilize or release, forming an aerosol for inhalation. Figure 1 As shown.

[0084] In optional embodiments, the aerosol generating article 1000 preferably uses a tobacco-containing material that releases volatile compounds from the matrix upon heating; or it may be a non-tobacco material suitable for electrically heated smoking after heating. The aerosol generating article 1000 preferably uses a solid matrix, which may include one or more of the following: vanilla leaves, tobacco leaves, homogenized tobacco, expanded tobacco, powder, granules, fragments, strips, or sheets; or the solid matrix may contain additional tobacco or non-tobacco volatile aroma compounds to be released when the matrix is ​​heated.

[0085] according to Figure 1As shown, when the aerosol-generating article 1000 is received in the aerosol-generating device 100, it is beneficial that a part, such as the filter tip, is exposed outside the aerosol-generating device 100 for the user to suck.

[0086] The structure of the aerosol-generating device 100 according to an embodiment of the present application can be referred to Figure 1 As shown, the overall shape of the device is generally constructed in a longitudinally elongated shape. The aerosol-generating device 100 includes:

[0087] A chamber having an opening 40; in use, the aerosol-generating article 1000 can be removably received in the chamber through the opening 40 of the chamber;

[0088] A heater 30, at least partially disposed around or defining the chamber; when the aerosol-generating article 1000 is received in the chamber, the heater 30 surrounds the aerosol-generating article 1000 from the outside and heats it, so that the aerosol-generating article 1000 releases a variety of volatile compounds, and these volatile compounds are formed only by heat treatment;

[0089] A battery cell 10 for supplying power; more preferably, the battery cell 10 is a rechargeable DC battery cell 10 and can be charged by connecting to an external power source;

[0090] A circuit board 20, such as a PCB board or an FPC board, is provided with a circuit for guiding current between the battery cell 10 and the heater 30.

[0091] In Figure 1 In the illustrated embodiment, the heater 30 is arranged in a tubular shape, and at least part of the tubular hollow of the heater 30 forms or defines a chamber for receiving the aerosol-generating article 1000. When the aerosol-generating article 1000 is received in the chamber, the heater 30 at least partially surrounds or encloses the aerosol-generating article 1000 and heats it from the outer periphery of the aerosol-generating article 1000. And, when the aerosol-generating article 1000 is received in the chamber, it is at least partially accommodated and held within the heater 30.

[0092] Figures 2 to 4 A schematic diagram of a heater 30 according to an embodiment is shown. In this embodiment, the heater 30 includes:

[0093] A first end 311 and a second end 312 facing away from each other in the longitudinal direction; wherein, the first end 311 is arranged close to and facing the opening 40;

[0094] A tubular base body 31; in use, at least part of the inner hollow of the base body 31 defines a chamber for accommodating and holding the aerosol-generating article 1000; and,

[0095] The first heating element 32 and the second heating element 33 are formed or arranged on the substrate 31 at intervals; the first heating element 32 and the second heating element 33 are configured to be in an annular shape, and the first heating element 32 and the second heating element are closed in the circumferential direction; the first heating element 32 and the second heating element 33 are formed or bonded to the outer surface of the substrate 31; the first heating element 32 is closer to the first end 311 than the second heating element 33, and the second heating element 33 is closer to the second end 312 than the first heating element 36a.

[0096] In some embodiments, the first heating element 32 and the second heating element 33 are formed on the outer surface of the substrate 31 by means of deposition, spraying, printing, wrapping, etc. Or in some other embodiments, the first heating element 32 and the second heating element 33 are formed on the inner surface of the substrate 31.

[0097] In some embodiments, the circumferential length or perimeter of the substrate 31 is greater than the length of the substrate 31 in the longitudinal direction. In some embodiments, the longitudinal length of the substrate 31 does not exceed 15 mm or is less than 15 mm. In some embodiments, the substrate 31 may have a longitudinal length of about 10 mm to 15 mm and an inner diameter dimension of about 5.8 mm to 10 mm. In some specific embodiments, the substrate 31 may have a longitudinal length of 13 mm; the substrate 31 may have an inner diameter of 7.6 mm.

[0098] In some embodiments, the first heating element 32 and / or the second heating element 33 are closed in the circumferential direction of the heater 30; the first heating element 32 and / or the second heating element 33 are closed rings. In some embodiments, the length of the first heating element 32 and / or the second heating element 33 is 4 to 8 mm. In some specific embodiments, the first heating element 32 and / or the second heating element 33 have a length of about 5 mm or 6 mm.

[0099] In Figures 2 to 4 In the illustrated embodiment, the first heating element 32 and the second heating element 33 have the same length.

[0100] In this embodiment, it is advantageous that the first heating element 32 and the second heating element 33 can respectively heat different sections of the aerosol-generating article 1000, thereby providing segmented heating of the aerosol-generating article 1000.

[0101] In some embodiments, the first heating element 32 and the second heating element 33 are resistive heating elements or infrared heating elements, such as coatings or thin films sprayed, deposited, printed, or wrapped on the outer surface of the substrate 31.

[0102] In some embodiments, the first heating element 32 and the second heating element 33 are coatings or thin layers formed on the substrate 31 by deposition, spraying, printing, etc. Or in other embodiments, the first heating element 32 and the second heating element 33 are thin films wrapped or bonded to the substrate 31. Or in other optional embodiments, the first heating element 32 and the second heating element 33 of the resistor may also be heating films of the resistor wound or bonded to the substrate 31.

[0103] In some embodiments, the thickness of the first heating element 32 and the second heating element 33 in the form of a resistive coating is preferably controlled to be 10 μm to 300 μm; and the first heating element 32 and the second heating element 33 are formed on the surface of the tubular substrate 31 by means of atmospheric plasma spraying on the outer surface of the tubular substrate 31 and then cured.

[0104] In some embodiments, the first heating element 32 and the second heating element 33 are resistance heating layers; by guiding current through the first heating element 32 and the second heating element 33, the first heating element 32 can be heated by resistance Joule heating, thereby heating the aerosol generating article 1000. Furthermore, in some embodiments, the first heating element 32 and the second heating element 33 used for heating by generating resistance Joule heating may comprise graphite or a resistive metal or alloy; wherein the metal or alloy is, for example, nickel-chromium alloy, nickel-iron alloy, platinum, tungsten, silver, aluminum, titanium, molybdenum, manganese, or alloys containing them.

[0105] When the first heating element 32 and the second heating element 33 are heated by resistance heating, the substrate 31 is made of a material with good thermal conductivity, such as ceramic, glass, or surface-insulating metals or alloys, such as anodized aluminum, aluminum alloys, copper alloys, stainless steel, etc. In some embodiments, the thermal conductivity of the substrate 31 is at least 10 W / mK, preferably or at least 100 W / mK; or in some embodiments, the thermal conductivity of the substrate 31 is greater than 200 W / mK or higher. In some embodiments, the substrate 31 includes metals suitable for the above-mentioned high thermal conductivity, such as aluminum, copper, titanium, or alloys containing at least one of them. In some embodiments, the wall thickness of the substrate 31 is between 0.1 and 0.5 mm; more specifically, for example, the wall thickness of the substrate 31 is between 0.15 and 0.2 mm.

[0106] In some embodiments, the first heating element 32 and the second heating element 33 are infrared emitting layers, such as electro-induced infrared emitting layers. By providing a DC voltage to the first heating element 32 and the second heating element 33, the first heating element 32 and the second heating element 33 can be driven by voltage to radiate infrared rays, thereby heating the aerosol generating product 1000. When the first heating element 32 and the second heating element 33 are used for heating by radiating infrared rays as described above, the substrate 31 is made of an infrared-transmitting material, such as quartz, glass, ceramic, etc. In some embodiments, the first heating element 32 and the second heating element 33 for radiating infrared rays can be coatings made of ceramic materials such as zirconium, or Fe-Mn-Cu, tungsten, or transition metals and their oxides. For example, in some embodiments, the first heating element 32 and the second heating element 33 for radiating infrared rays are composed of oxides of at least one metal element such as Mg, Al, Ti, Zr, Mn, Fe, Co, Ni, Cu, Cr, Zn, etc., which can radiate infrared rays with heating effect when heated to an appropriate heating temperature.

[0107] exist Figures 2 to 4 In the embodiment shown, the outer surface of the substrate 31 is defined by:

[0108] The first interval region 313 is formed or defined between the first heating element 32 and the first end 311;

[0109] The second interval region 314 is formed or defined between the first heating element 32 and the second heating element 33;

[0110] The third interval region 315 is formed or defined between the second heating element 33 and the second end 312.

[0111] In some embodiments, the first spacing region 313 and / or the second spacing region 314 and / or the third spacing region 315 have substantially the same dimensions along the longitudinal direction of the substrate 31. For example, in some alternative embodiments, the first spacing region 313 and / or the second spacing region 314 and / or the third spacing region 315 have a length of approximately 0.5 to 2 mm; more specifically, for example, the first spacing region 313 and / or the second spacing region 314 and / or the third spacing region 315 have a length of approximately 1.0 mm.

[0112] exist Figures 2 to 4 In the illustrated embodiment, the heater 30 further includes:

[0113] The first interdigital electrode 34, the second interdigital electrode 35, and the third interdigital electrode 36 are used to guide current on the first heating element 32 and the second heating element 33.

[0114] In some embodiments, the first interdigital electrode 34 and / or the second interdigital electrode 35 and / or the third interdigital electrode 36 are indirectly connected to the circuit board 20 through conductive contacts; alternatively, the first interdigital electrode 34 and / or the second interdigital electrode 35 and / or the third interdigital electrode 36 are directly connected to the circuit board 20 by welding conductive leads or the like.

[0115] In some embodiments, the first interdigital electrode 34, the second interdigital electrode 35, and the third interdigital electrode 36 may be made of a good conductor material. In some embodiments, the first interdigital electrode 34, the second interdigital electrode 35, and the third interdigital electrode 36 may be made of a metal or alloy with a low resistivity, such as gold, silver, copper, nickel, or an alloy containing them.

[0116] In some embodiments, the first interdigital electrode 34, the second interdigital electrode 35, and the third interdigital electrode 36 are coatings or thin films formed by printing, deposition, spraying, or the like.

[0117] In a specific arrangement, the first interdigital electrode 34 includes:

[0118]

[0119] A first base portion 341, which is substantially annular or arranged around at least a part of the base body 31; the first base portion 341 is arranged in the first spacer region 313; the first base portion 341 is spaced from the first heating element 32;

[0119] At least one or more first finger portions 342, arranged to extend along the longitudinal direction of the heater 30; at least one or more first finger portions 342 are spaced circumferentially of the heater 30; at least one or more first finger portions 342 extend from the first base portion 341 to the first heating element 32 and are combined with the first heating element 32; specifically, the extending length of the first finger portion 342 crosses the first heating element 32 and terminates at the second spacer region 314. At least one or more first finger portions 342 avoid the second heating element 33.

[0120] In a specific arrangement, the second interdigital electrode 35 includes:

[0121] A second base portion 351, which is substantially annular or arranged around at least a part of the base body 31; the second base portion 351 is arranged in the second spacer region 314; the second base portion 351 is spaced from both the first heating element 32 and the second heating element 33;

[0122] At least one or more second interdigitates 352 are arranged extending longitudinally along the heater 30; at least one or more second interdigitates 352 are arranged at intervals in the circumferential direction of the heater 30; at least one or more second interdigitates 352 extend from the second base 351 to the first heating element 32 and are attached to the first heating element 32; specifically, the extension length of the second interdigitates 352 crosses the first heating element 32 and terminates in the first spacing region 313;

[0123] At least one or more third interdigitates 353 are arranged extending longitudinally along the heater 30; at least one or more third interdigitates 353 are arranged at intervals in the circumferential direction of the heater 30; at least one or more third interdigitates 353 extend from the second base 351 to the second heating element 33 and are attached to the second heating element 33; specifically, the extension length of the third interdigitates 353 crosses the second heating element 33 and terminates in the third interval region 315.

[0124] In its specific arrangement, the third interdigital electrode 36 includes:

[0125] The third base 361 is generally annular or arranged around at least a portion of the base 31; the third base 361 is arranged in the third spacer region 315; the third base 361 is spaced apart from the second heating element 33.

[0126] At least one or more fourth interdigitates 362 are arranged extending longitudinally along the heater 30; at least one or more fourth interdigitates 362 are arranged at intervals in the circumferential direction of the heater 30; at least one or more fourth interdigitates 362 extend from the third base 361 to the second heating element 33 and are attached to the second heating element 33; specifically, the extension length of the fourth interdigitates 362 crosses the second heating element 33 and terminates in the second spacing region 314. At least one or more fourth interdigitates 362 avoid the first heating element 32.

[0127] In this embodiment, the first interdigital portion 342 of the first interdigital electrode 34 and the second interdigital portion 352 of the second interdigital electrode 35 are alternately arranged with the first heating element 32 in the circumferential direction. In this embodiment, by alternately arranging the first interdigital portions 342 and 352, the first heating element 32 is divided in the circumferential direction into multiple heating regions located between adjacent first interdigital portions 342 and 352; each heating region is guided by current in the circumferential direction by adjacent first interdigital portions 342 and 352. Furthermore, in use, when the first interdigital electrode 34 and the second interdigital electrode 35 are electrically connected to the positive and negative terminals of the battery cell 10 respectively, the multiple heating regions defined by the first heating element 32 are all connected in parallel; thus, the total resistance of the first heating element 32 is reduced by a factor of two during operation, resulting in greater power and heating efficiency.

[0128] In this embodiment, the third interdigital portion 353 of the second interdigital electrode 35 and the fourth interdigital portion 362 of the third interdigital electrode 36 are alternately arranged with respect to the circumference of the second heating element 33. In this embodiment, by alternately arranging the third interdigital portions 353 and the fourth interdigital portions 362, the second heating element 33 is circumferentially divided into multiple heating regions located between adjacent third interdigital portions 353 and fourth interdigital portions 362; each heating region is guided by current circumferentially by adjacent third interdigital portions 353 and fourth interdigital portions 362. Furthermore, in use, when the second interdigital electrode 35 and the third interdigital electrode 36 are electrically connected to the positive and negative terminals of the battery cell 10, respectively, the multiple heating regions defined by the second heating element 33 are all connected in parallel; thus, the total resistance of the second heating element 33 is reduced by a factor of two during operation, resulting in greater power and heating efficiency.

[0129] exist Figures 2 to 4 In the illustrated embodiment, the number of first interdigital portions 342 of the first interdigital electrode 34 and the number of second interdigital portions 352 of the second interdigital electrode 35 are the same; and the first interdigital portions 342 of the first interdigital electrode 34 and the second interdigital portions 352 of the second interdigital electrode 35 have the same first width dimension W1 in the circumferential direction; in the embodiment, the first width dimension W1 is approximately 0.1 to 2 mm.

[0130] exist Figures 2 to 4 In the illustrated embodiment, the number of third interdigital portions 353 of the second interdigital electrode 35 and the number of fourth interdigital portions 362 of the third interdigital electrode 36 are the same; and the third interdigital portions 353 of the second interdigital electrode 35 and the fourth interdigital portions 362 of the third interdigital electrode 36 have the same second width dimension W2 in the circumferential direction; in this embodiment, the second width dimension W2 is approximately 0.5 to 3 mm. The second width dimension W2 is larger than the first width dimension W1.

[0131] In an embodiment, the number of the first finger portions 342 of the first interdigital electrode 34 is the same as the number of the fourth finger portions 362 of the third interdigital electrode 36; and the number of the second finger portions 352 of the second interdigital electrode 35 is the same as the number of the third finger portions 353 of the second interdigital electrode 35.

[0132] In an embodiment, the sum of the number of the first finger portions 342 of the first interdigital electrode 34 and the number of the second finger portions 352 of the second interdigital electrode 35 is equal to the sum of the number of the third finger portions 353 of the second interdigital electrode 35 and the number of the fourth finger portions 362 of the third interdigital electrode 36.

[0133] In an embodiment, the area of the first heating element 32 covered by the first finger portions 342 and the second finger portions 352 is smaller than the area of the second heating element 33 covered by the third finger portions 353 and the fourth finger portions 362. Then, in use, for example Figure 4 as shown, when the first interdigital electrode 34 and the third interdigital electrode 36 are simultaneously connected to the positive electrode of the battery cell 10, and the second interdigital electrode 35 is connected to the negative electrode of the battery cell 10 so that the first heating element 32 and the second heating element 33 work in parallel simultaneously; the total resistance value of the second heating element 33 is smaller than that of the first heating element 32, so the power allocated to the second heating element 33 is greater, and thus it has a heating rate or temperature higher than that of the first heating element 32.

[0134] Then, in use, the control circuit on the circuit board 20 is configured to:

[0135] In the first time stage, start heating the first heating element 32 alone. For example, only connect the first interdigital electrode 34 and the second interdigital electrode 35 to the positive and negative electrodes of the battery cell 10 respectively, so that the section of the aerosol generating article 1000 surrounded by the first heating element 32 quickly generates aerosol;

[0136] In the second time stage, adopt, for example Figure 4 the electrical connection method shown to heat the first heating element 32 and the second heating element 33 in parallel simultaneously. In this stage, due to the greater power of the second heating element 33, the temperature difference between the second heating element 33 and the first heating element 32 can be gradually reduced, so as to uniformly heat the whole aerosol generating article 1000 to generate substantially consistent aerosol.

[0137] Or Figures 5 to 7 FIG. shows a schematic diagram of a heater 30a according to another embodiment. In this embodiment, the heater 30a includes:

[0138] a tubular substrate 31a that at least partially surrounds or defines a chamber; having a first end 311a and a second end 312a that face away from each other in the longitudinal direction; the circumferential length of the substrate 31a is greater than the longitudinal length;

[0139] A first heating element 32a and a second heating element 33a are formed or arranged at intervals on a substrate 31a; the first heating element 32a and the second heating element 33a are configured in annular shape and are closed in the circumferential direction; the first heating element 32a and the second heating element 33a are formed or bonded to the outer surface of the substrate 31a; the first heating element 32a is closer to the first end 311a than the second heating element 33a, and the second heating element 33a is closer to the second end 312a than the first heating element 32a. In this embodiment, the first heating element 32a and the second heating element 33a can respectively heat different sections of the aerosol generating article 1000, thereby providing the advantage of segmented heating of the aerosol generating article 1000.

[0140] exist Figures 5 to 7 In the embodiment shown, the outer surface of the substrate 31a is defined by:

[0141] The first interval region 313a is formed or defined between the first heating element 32a and the first end 311a;

[0142] The second interval region 314a is formed or defined between the first heating element 32a and the second heating element 33a;

[0143] The third interval region 315a is formed or defined between the second heating element 33a and the second end 312a.

[0144] exist Figures 5 to 7 In the illustrated embodiment, heater 30a further includes:

[0145] The first interdigital electrode 34a, the second interdigital electrode 35a, and the third interdigital electrode 36a are used to guide current on the first heating element 32a and the second heating element 33a.

[0146] In this embodiment, the first interdigital electrode 34a has at least one first interdigital portion 342a extending longitudinally from the first base 341a to the first heating element 32a; the second interdigital electrode 35a has at least one second interdigital portion 352a extending longitudinally from the second base 351a to the first heating element 32a. In this embodiment, the first interdigital portions 342a of the first interdigital electrode 34a and the second interdigital portions 352a of the second interdigital electrode 35a are arranged circumferentially on the first heating element 32a at intervals, thereby guiding current on the first heating element 32a during use.

[0147] In this embodiment, the second interdigital electrode 35a has at least one third interdigital portion 353a extending longitudinally from the second base 351a to the second heating element 33a; the third interdigital electrode 36a has at least one fourth interdigital portion 362a extending longitudinally from the third base 361a to the second heating element 33a. In this embodiment, the third interdigital portions 353a and 362a of the second interdigital electrode 35a and the fourth interdigital portions 362a of the third interdigital electrode 36a are arranged circumferentially on the second heating element 33a, thereby guiding current on the second heating element 33a during use.

[0148] In this embodiment, the second interdigital portion 352a and the third interdigital portion 353a of the second interdigital electrode 35a are staggered in the longitudinal direction.

[0149] In this embodiment, the number of first interdigital portions 342a of the first interdigital electrode 34a and the number of second interdigital portions 352a of the second interdigital electrode 35a are the same; and the first interdigital portions 342a of the first interdigital electrode 34a and the second interdigital portions 352a of the second interdigital electrode 35a have the same width dimension W3 in the circumferential direction. In this embodiment, the number of third interdigital portions 353a of the second interdigital electrode 35a and the number of fourth interdigital portions 362a of the third interdigital electrode 36a are the same; and the third interdigital portions 353a of the second interdigital electrode 35a and the fourth interdigital portions 362a of the third interdigital electrode 36a have the same width dimension W3 in the circumferential direction. In some embodiments, the width dimension W3 may be between 0.1 and 3 mm.

[0150] In this embodiment, the number of third interdigital portions 353a of the second interdigital electrode 35a is greater than the number of second interdigital portions 352a of the second interdigital electrode 35a. Furthermore, the number of third interdigital portions 353a and fourth interdigital portions 362a is greater than the number of first interdigital portions 342a of the first interdigital electrode 34a. For example, in... Figures 5 to 7 As shown, there are two first interdigitated fingers 342a and / or two second interdigitated fingers 352a, and three third interdigitated fingers 353a and / or four interdigitated fingers 362a.

[0151] In this embodiment, the area of ​​the first heating element 32a covered by the first interdigitated portion 342a and the second interdigitated portion 352a is smaller than the area of ​​the second heating element 33 covered by the third interdigitated portion 353 and the fourth interdigitated portion 362. Therefore, in use, for example... Figure 7As shown, when the first interdigital electrode 34a and the third interdigital electrode 36a are simultaneously connected to the positive terminal of the battery cell 10, and the second interdigital electrode 35a is connected to the negative terminal of the battery cell 10, so that the first heating element 32a and the second heating element 33a work in parallel, the total resistance of the second heating element 33a is less than that of the first heating element 32a. Therefore, the power allocated to the second heating element 33a is greater, resulting in a higher heating rate or temperature than that of the first heating element 32a.

[0152] The control circuit on circuit board 20 is further configured as follows:

[0153] In the first time phase, the first heating element 32a is controlled to start heating independently, thereby rapidly producing aerosol in the section of the aerosol generating product 1000 surrounded by the first heating element 32a.

[0154] In the second time phase, the first heating element 32a and the second heating element 33a are controlled to heat simultaneously in parallel, so that the second heating element 33a, due to its greater power, can gradually reduce the temperature difference with the first heating element 32a, thereby uniformly heating the aerosol generating product 1000 as a whole to produce a basically consistent aerosol.

[0155] or Figure 8 and Figure 9 A schematic diagram of a heater 30b according to yet another embodiment is shown, in which the heater 30b includes:

[0156] The tubular substrate 31b extends from the first end 311b to the second end 312b and at least partially surrounds or defines the chamber for receiving the aerosol-generating article 1000.

[0157] A first heating element 32b and a second heating element 33b are arranged longitudinally at intervals on the substrate 31b;

[0158] The surface of the substrate 31b defines a first interval region 313b between the first heating element 32b and the first end 311b, a second interval region 314b between the first heating element 32b and the second heating element 33b, and a third interval region 315b between the second heating element 33b and the second end 312b.

[0159] A first interdigital electrode 34b, a second interdigital electrode 35b, and a third interdigital electrode 36b are used to guide current on a first heating element 32b and a second heating element 33b. The first interdigital electrode 34b has at least one first base 341b extending longitudinally to the first heating element 32b. The second interdigital electrode 35b has at least one second interdigital portion 352b extending longitudinally from a second base 351b to the first heating element 32b and at least one third interdigital portion 353b extending longitudinally from a second base 351b to the second heating element 33b. The third interdigital electrode 36b has at least one fourth interdigital portion 362b extending longitudinally from a third base 361b to the second heating element 33b.

[0160] In this embodiment, the first heating element 32b and the second heating element 33b have the same length.

[0161] In this embodiment, the first interdigital portion 342b, the second interdigital portion 352b, the third interdigital portion 353b, and the fourth interdigital portion 362b have the same number, for example, two of each. Also in this embodiment, the first interdigital portion 342b, the second interdigital portion 352b, the third interdigital portion 353b, and the fourth interdigital portion 362b have the same width dimension W4; in this embodiment, the width dimension W4 may be approximately between 0.5 and 3 mm.

[0162] In this embodiment, the circuit board 20 can selectively heat the first heating element 32b by connecting only the first interdigital electrode 34b and the second interdigital electrode 35b to the positive and negative terminals of the battery cell 10. The circuit board 20 can also selectively heat the second heating element 33b by connecting only the second interdigital electrode 35b and the third interdigital electrode 36b to the positive and negative terminals of the battery cell 10. Furthermore, the circuit board 20 can also selectively heat the first heating element 32b and the second heating element 33b simultaneously in parallel by connecting the first interdigital electrode 34b and the third interdigital electrode 36b to the positive terminal of the battery cell 10 and connecting the second interdigital electrode 35b to the negative terminal of the battery cell 10.

[0163] In some embodiments, the circuit board 20 is configured as follows:

[0164] In the first time phase, the first heating element 32b is individually controlled to heat the section of the aerosol generating product 1000 surrounded by the first heating element 32b to rapidly generate aerosol.

[0165] In the second time phase, the second heating element 33b is individually controlled to heat, so that the section of the aerosol generating article 1000 surrounded by the second heating element 33b immediately generates aerosol.

[0166] In the second time phase, the first heating element 32b and the second heating element 33b are controlled to heat simultaneously with substantially the same power to produce aerosol as a whole in a substantially uniform manner for the aerosol generating article 1000.

[0167] In this embodiment, the third base 361b of the third interdigital electrode 36b is a non-closed ring and has a notch 364b. One of the third interdigital portions 353b of the second interdigital electrode 35b extends through the notch 364b to the second end 312b so that the second contact 372b can abut against it to form conductivity.

[0168] In this embodiment, heater 30b further includes:

[0169] The first electrical contact 371b abuts against one of the first interdigital portions 342b and thus forms an electrical connection with the first interdigital electrode 34b;

[0170] The second electrical contact 372b abuts against the third interdigital portion 353b passing through the notch 364b and thus forms an electrical connection with the second interdigital electrode 35b;

[0171] The third electrical contact 373b abuts against one of the fourth interdigital portions 362b and thus forms an electrical connection with the third interdigital electrode 36b.

[0172] Subsequently, the first electrical contact 371b, the second electrical contact 372b, and the third electrical contact 373b are connected to the circuit board 20 by means of soldering leads, etc. The applicant has provided details regarding the specific shape and structure of the first electrical contact 371b, the second electrical contact 372b, and the third electrical contact 373b, as well as details regarding their assembly, fixing, and elasticity, in prior Chinese patent applications CN215958354U and CN117617570A. All content concerning the electrical contacts in the aforementioned documents is incorporated herein by reference.

[0173] or Figure 10 and Figure 11 A schematic diagram of a heater 30c according to yet another embodiment is shown, in which the heater 30c includes:

[0174] The tubular substrate 31c extends from the first end 311c to the second end 312c and at least partially surrounds or defines the chamber of the receiving aerosol-generating article 1000.

[0175] A first heating element 32c and a second heating element 33c are arranged longitudinally at intervals on the substrate 31c;

[0176] The surface of the substrate 31c defines a first interval region 313c between the first heating element 32c and the first end 311c, a second interval region 314c between the first heating element 32c and the second heating element 33c, and a third interval region 315c between the second heating element 33c and the second end 312c.

[0177] A first interdigital electrode 34c, a second interdigital electrode 35c, and a third interdigital electrode 36c are used to guide current on a first heating element 32c and a second heating element 33c. The first interdigital electrode 34c has at least one first base 341c extending longitudinally to the first heating element 32c as a first interdigital portion 342c. The second interdigital electrode 35c has at least one second interdigital portion 352c extending longitudinally from a second base 351c to the first heating element 32c and at least one third interdigital portion 353c extending longitudinally from a second base 351c to the second heating element 33c. The third interdigital electrode 36c has at least one fourth interdigital portion 362c extending longitudinally from a third base 361c to the second heating element 33c.

[0178] In this embodiment, the first interdigital portion 342c, the second interdigital portion 352c, the third interdigital portion 353c, and the fourth interdigital portion 362c have the same number, for example, two of each. Also in this embodiment, the first interdigital portion 342c, the second interdigital portion 352c, the third interdigital portion 353c, and the fourth interdigital portion 362c have the same width.

[0179] In this embodiment, the first heating element 32c and the second heating element 33c have different extension dimensions in the longitudinal direction of the heater 30c. Specifically, the first heating element 32c has a first extension dimension d11 in the longitudinal direction of the heater 30c, and the second heating element 33c has a second extension dimension d12 in the longitudinal direction of the heater 30c. In this embodiment, the first extension dimension d11 is smaller than the second extension dimension d12.

[0180] In one specific embodiment, the ratio of the first extension dimension d11 to the second extension dimension d12 is approximately 3:7. Alternatively, in more embodiments, the ratio of the first extension dimension d11 to the second extension dimension d12 may be between 1:9 and 4.5:5.5.

[0181] In use, the first heating element 32c and the second heating element 33c have different longitudinal extension dimensions. When the circuit board 20 controls the first heating element 32c and the second heating element 33c to heat in parallel at the same time, the total resistance of the second heating element 33c is less than that of the first heating element 32c. Therefore, the power allocated to the second heating element 33c is greater, resulting in a higher heating rate or temperature than that of the first heating element 32c.

[0182] In use, the control circuit on circuit board 20 is configured as follows:

[0183] In the first time phase, the first heating element 32c is controlled to start heating independently, thereby rapidly producing aerosol in the section of aerosol generating product 1000 surrounded by the first heating element 32c.

[0184] In the second time phase, the first heating element 32c and the second heating element 33c are controlled to heat simultaneously in parallel. In this phase, the second heating element 33c has greater power, which can gradually reduce the temperature difference with the first heating element 32c, thereby uniformly heating the aerosol generating product 1000 as a whole to produce basically uniform aerosol.

[0185] It should be noted that the preferred embodiments of this application are given in the specification and accompanying drawings, but are not limited to the embodiments described in this specification. Furthermore, those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. An aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; characterised in that, Comprise: a chamber for receiving an aerosol-generating article; a heater for heating the aerosol-generating article; the heater comprising: a first end and a second end opposite to each other in a longitudinal direction; a first heating element and a second heating element arranged in sequence and spaced apart from each other in the longitudinal direction from the first end to the second end, and at least partially surrounding the chamber; a first interdigital electrode comprising at least one first interdigital portion arranged extending on the first heating element in the longitudinal direction; a second interdigital electrode comprising at least one second interdigital portion arranged extending on the first heating element in the longitudinal direction, and at least one third interdigital portion arranged extending on the second heating element in the longitudinal direction; the first interdigital portion and the second interdigital portion are arranged alternately in a circumferential direction of the first heating element; a third interdigital electrode comprising at least one fourth interdigital portion arranged extending on the second heating element in the longitudinal direction; the third interdigital portion and the fourth interdigital portion are arranged alternately in a circumferential direction of the second heating element; a sum of a number of the first interdigital portion and the second interdigital portion is less than a sum of a number of the third interdigital portion and the fourth interdigital portion.

2. An aerosol-generating device according to claim 1, wherein, an area of the first heating element covered by the first interdigital portion and the second interdigital portion is less than an area of the second heating element covered by the third interdigital portion and the fourth interdigital portion.

3. An aerosol-generating device according to claim 1 or 2, wherein, a number of the first interdigital portion and / or the second interdigital portion is less than a number of the third interdigital portion and / or the fourth interdigital portion.

4. An aerosol-generating device according to claim 1 or 2, wherein a width dimension of the first interdigital portion and / or the second interdigital portion is less than a width dimension of the third interdigital portion and / or the fourth interdigital portion.

5. An aerosol-generating device according to claim 1 or 2, wherein the chamber has an opening; in use, the aerosol-generating article can be received into or removed from the chamber through the opening; the first end is arranged close to or towards the opening.

6. An aerosol-generating device according to claim 5, wherein Further comprise: an electric core and a circuit board; wherein the circuit board is configured to: in a first time phase, connect the first interdigital electrode and the second interdigital electrode to a positive electrode and a negative electrode of the electric core respectively, to control the first heating element to heat; in a second time phase, connect the first interdigital electrode and the third interdigital electrode to one of the positive electrode and the negative electrode of the electric core simultaneously, and connect the second interdigital electrode to the other of the positive electrode and the negative electrode of the electric core, to control the first heating element and the second heating element to heat simultaneously.

7. An aerosol-generating device according to claim 1 or 2, wherein the first heating element and the second heating element have the same extension dimension in the longitudinal direction of the heater; alternatively, an extension dimension of the first heating element in the longitudinal direction of the heater is less than an extension dimension of the second heating element in the longitudinal direction of the heater.

8. An aerosol-generating device according to claim 1 or 2, wherein, the first heating element has a first extension dimension in the longitudinal direction of the heater, and the second heating element has a second extension dimension in the longitudinal direction of the heater; a ratio of the first extension dimension to the second extension dimension is between 1:9 and 4.5:5.

5.

9. An aerosol-generating device according to claim 1 or 2, wherein, the second interdigital portion and the third interdigital portion are arranged staggered in the longitudinal direction of the heater.

10. An aerosol-generating device according to claim 1 or 2, wherein, The first interdigital electrode further comprises a first base portion located between the first heating element and the first end, the first interdigital portion being arranged to extend from the first base portion towards the second end; and / or, the second interdigital electrode further comprises a second base portion located between the first heating element and the second heating element, the second interdigital portion being arranged to extend from the second base portion towards the first end, the third interdigital portion being arranged to extend from the second base portion towards the second end; and / or, the third interdigital electrode further comprises a third base portion located between the second heating element and the second end, the fourth interdigital portion being arranged to extend from the third base portion towards the first end.

11. An aerosol-generating device according to claim 10, wherein, The first base portion is substantially annular around the chamber; and / or, the second base portion is substantially annular around the chamber; and / or, the third base portion has a gap defined therein, whereby the third base portion is non-closed in a circumferential direction of the heater; one of the third interdigital portions passes through the gap in a longitudinal direction of the heater.

12. An aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; characterised in that, Comprising: a chamber for receiving an aerosol-generating article; a heater for heating an aerosol-generating article; the heater comprising: first and second ends opposite in a longitudinal direction; first and second heating elements arranged in series in a longitudinal direction from the first end to the second end and at least partially around the chamber; a first interdigital electrode comprising at least one first interdigital portion arranged to extend over the first heating element in the longitudinal direction; a second interdigital electrode comprising at least one second interdigital portion arranged to extend over the first heating element in the longitudinal direction and at least one third interdigital portion arranged to extend over the second heating element in the longitudinal direction; the first interdigital portions and the second interdigital portions being arranged alternately in a circumferential direction of the first heating element; a third interdigital electrode comprising at least one fourth interdigital portion arranged to extend over the second heating element in the longitudinal direction; the third interdigital portions and the fourth interdigital portions being arranged alternately in a circumferential direction of the second heating element; an area of the first heating element covered by the first interdigital portions and the second interdigital portions is less than an area of the second heating element covered by the third interdigital portions and the fourth interdigital portions.

13. An aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; characterised in that, Comprising: a chamber having an open mouth; in use, an aerosol-generating article is receivable into or removable from the chamber through the open mouth; a heater for heating an aerosol-generating article; the heater comprising: a first end towards the open mouth and a second end opposite the first end in a longitudinal direction; first and second heating elements arranged in series in a longitudinal direction from the first end to the second end and at least partially around the chamber; an extension of the first heating element in the longitudinal direction of the heater is less than an extension of the second heating element in the longitudinal direction of the heater; a first interdigital electrode comprising at least one first interdigital portion arranged to extend over the first heating element in the longitudinal direction; a second interdigital electrode comprising at least one second interdigital portion arranged to extend over the first heating element in the longitudinal direction and at least one third interdigital portion arranged to extend over the second heating element in the longitudinal direction; the first interdigital portions and the second interdigital portions being arranged alternately in the circumferential direction of the first heating element; a third interdigital electrode comprising at least one fourth interdigital portion arranged to extend over the second heating element in the longitudinal direction; the third interdigital portions and the fourth interdigital portions being arranged alternately in the circumferential direction of the second heating element.

14. A heater for an aerosol generating device, characterized in that, comprising: a first end and a second end opposite to each other in the longitudinal direction; a first heating element and a second heating element arranged sequentially and spaced apart in the longitudinal direction from the first end to the second end; a first interdigital electrode comprising at least one first interdigital portion arranged to extend over the first heating element in the longitudinal direction; a second interdigital electrode comprising at least one second interdigital portion arranged to extend over the first heating element in the longitudinal direction and at least one third interdigital portion arranged to extend over the second heating element in the longitudinal direction; the first interdigital portions and the second interdigital portions being arranged alternately in the circumferential direction of the first heating element; a third interdigital electrode comprising at least one fourth interdigital portion arranged to extend over the second heating element in the longitudinal direction; the third interdigital portions and the fourth interdigital portions being arranged alternately in the circumferential direction of the second heating element; a sum of the number of the first interdigital portions and the second interdigital portions is less than a sum of the number of the third interdigital portions and the fourth interdigital portions.

15. A heater for an aerosol generating device, characterized in that, comprising: a first end and a second end opposite to each other in the longitudinal direction; a first heating element and a second heating element arranged sequentially and spaced apart in the longitudinal direction from the first end to the second end; a first interdigital electrode comprising at least one first interdigital portion arranged to extend over the first heating element in the longitudinal direction; a second interdigital electrode comprising at least one second interdigital portion arranged to extend over the first heating element in the longitudinal direction and at least one third interdigital portion arranged to extend over the second heating element in the longitudinal direction; the first interdigital portions and the second interdigital portions being arranged alternately in the circumferential direction of the first heating element; a third interdigital electrode comprising at least one fourth interdigital portion arranged to extend over the second heating element in the longitudinal direction; the third interdigital portions and the fourth interdigital portions being arranged alternately in the circumferential direction of the second heating element; an area of the first heating element covered by the first interdigital portions and the second interdigital portions is less than an area of the second heating element covered by the third interdigital portions and the fourth interdigital portions.

16. A heater for an aerosol generating device, characterized in that, comprising: a first end and a second end opposite to each other in the longitudinal direction; a first heating element and a second heating element arranged sequentially and spaced apart in the longitudinal direction from the first end to the second end; an extension size of the first heating element in the longitudinal direction of the heater is less than an extension size of the second heating element in the longitudinal direction of the heater; a first interdigital electrode comprising at least one first interdigital portion arranged to extend over the first heating element in the longitudinal direction; a second interdigital electrode comprising at least one second interdigital portion arranged extending in the longitudinal direction on the first heating element, and at least one third interdigital portion arranged extending in the longitudinal direction on the second heating element; the first interdigital portion and the second interdigital portion being arranged alternately in the circumferential direction of the first heating element; a third interdigital electrode comprising at least one fourth interdigital portion arranged extending in the longitudinal direction on the second heating element; the third interdigital portion and the fourth interdigital portion being arranged alternately in the circumferential direction of the second heating element.

Images