Aerosol-generating substrate level measurement

Abstract

The proposed invention relates to an aerosol-generating device (100) that enables direct measurement of the aerosol-generating substrate level in the cartridge (120). The device comprises a body (140) and a cartridge (120). The body (140) includes a control unit (141), an energy source (142), and a charging port (143). The 5 cartridge (120) houses a heater (127), an aerosol-generating substrate, a condensation chamber (132), and connector pins (129). The condensation chamber (132) also acts as a capacitance sensing unit, with the aerosol-generating substrate serving as a dielectric medium. The control unit (141) measures the substrate level in the condensation chamber (132) by detecting capacitance variance and regulates 10 the activation of the heater (127) accordingly. This prevents thermal stress on the heater (127), avoids the production of dry inhalation, and ensures consistent performance.

Description

TITLE OF THE INVENTIONAEROSOL-GENERATING SUBSTRATE LEVEL MEASUREMENTFIELD OF INVENTION

[0001] The present invention relates to an aerosol -generating device. Specifically, this disclosure pertains to the aerosol-generating device for measuring the level of aerosol-generating substrate within the cartridge.CROSS REFERENCE TO RELATED APPLICATIONS

[0002] Applicant claims priority and the benefit of Indian Provisional Patent application 202411015716, filed 01 March 2024 (01-03-2024), said application being hereby incorporated herein in its entirety by referenceBACKGROUND OF INVENTION

[0003] The aerosol-generating device comprises a cartridge and a body. The cartridge further comprises a heater, an aerosol-generating substrate, a condensation chamber, a mouthpiece, a connector pin (e.g. a pogo pin and the like), and space to store the aerosol-generating substrate. In the cartridge, the aerosol -generating substrate depletes based on user consumption. The visibility of the aerosolgenerating substrate's presence in the cartridge depends on the overall device design. The visibility of the aerosol -generating substrate in the cartridge is largely obscured due to the structural design of the cartridge and device assembly.

[0004] The user is interested in monitoring the level of aerosol-generating substrate in the cartridge. To check the level, users typically need to remove the cartridge and inspect the remaining aerosol -generating substrate. However, in some cases, the substrate level may not be fully visible. This limited visibility can cause confusion for users regarding the amount of aerosol-generating substrate remaining in the cartridge.

[0005] Most of the time, the user becomes aware of the complete absence or insufficient quantity of aerosol-generating substrate in the cartridge by observing the amount of aerosol produced, sensing a dry, burnt taste, or feeling excessive heatduring aerosolization. These conditions are extremely undesirable, as they can cause thermal stress on the heater and result in the presence of dry inhalation, leading to a negative experience for the user.

[0006] Measuring the level of aerosol -generating substrate in the cartridge is essential to avoid thermal stress on the heater through the control unit and, more importantly, to prevent user confusion regarding the availability of the aerosol - generating substrate, thereby enhancing the user experience. Generally, the measurement of aerosol-generating substrate is conducted using indirect and direct methods. In the indirect method, the availability of aerosol -generating substrate is estimated by subtracting a predefined quantity per user consumption from the previously available quantity. However, user consumption patterns vary from person to person, making this method unsuitable for accurate and real-time measurements. In contrast, the direct method measures the aerosol-generating substrate accurately in real-time using capacitance sensing techniques. Some of these techniques known in the art are listed below.

[0007] The prior art, WO2022245161A1, discloses an aerosol -generating device that includes a cartridge with an elongated insertion space, a body coupled to the cartridge, a capacitance sensor positioned in the body adjacent to the insertion space, and a controller. The controller determines whether a stick is inserted into the insertion space based on signals received from the capacitance sensor. When the stick is inserted, the controller also assesses whether it is a used stick based on signals from the capacitance sensor. However, it only describes the ability to detect the presence or absence of a stick in the device.

[0008] The prior art, W02020074929A1, discloses a refillable liquid tip or pod for a vaping device that includes capacitive sensor plates in the liquid reservoir. A liquid refilling device supplies liquid to the vaping device from a refill bottle; this refilling device incorporates a capacitance measuring circuit. A microcontroller utilizes data from the capacitance measuring circuit to determine whether the liquid level in the reservoir is above or below a threshold level. If the level is below the threshold, a liquid pump in the refilling device is activated to draw liquid from therefill bottle and pump it into the reservoir. Pumping ceases once the liquid reaches the threshold level.

[0009] The prior art, WO2017045897A1, describes a cartridge for an aerosolgenerating system. The cartridge comprises a sensor that includes a capacitor with a first capacitor plate and a second capacitor plate. A liquid storage portion holds a liquid aerosol-forming substrate, which is arranged between the first and second capacitor plates. The permittivity of the liquid storage portion changes in response to variations in the volume of the liquid aerosol-forming substrate contained within it. This invention discloses a mechanism to measure the amount of liquid present in the cartridge using dedicated sensing plates that are additionally fitted inside the cartridge.

[0010] However, none of the prior art discloses features such as measuring the amount of liquid present in the cartridge using a condensation chamber that acts as a capacitance sensing plate. Furthermore, there is no need for an additional sensing plate within the cartridge.

[0011] The proposed invention relates to an aerosol-generating device comprising a body and a cartridge. The body includes a control unit, an energy source, heater termination connections, and a charging port. The cartridge houses a heater, an aerosol-generating substrate, a condensation chamber, and connector pins. The condensation chamber is configured to condense vapor generated from the heater before passing it to the mouthpiece, and it also acts as a capacitance sensing unit, with the aerosol-generating substrate serving as a dielectric medium. The control unit measures the substrate level in the condensation chamber by detecting capacitance changes and regulates heater activation accordingly. This prevents thermal stress on the heater and avoids the production of dry inhalation, ensuring efficient and safe operation of the device.OBJECT OF INVENTION

[0012] Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:

[0013] An object of the present disclosure is to provide an aerosol -generating device with a simplified and integrated design that incorporates capacitance sensing portions within the condensation chamber for direct, precise, real-time measurement of the aerosol generating substrate level based on capacitance variance.

[0014] Another object of the present invention is to eliminate the need for separate or external sensing plates, thereby reducing the complexity and manufacturing costs of the cartridge design.

[0015] Yet another object of the present invention is to regulate heater activation based on the measured substrate level, preventing thermal stress on the heater, avoiding dry inhalation, and ensuring consistent aerosol quality.

[0016] Yet another object of the present invention is to enhance the operational lifespan of the heater by preventing overheating and thermal stress during aerosol generation.

[0017] Yet another object of the present invention is to ensure user satisfaction by providing accurate, real-time information about the aerosol-generating substrate level and notifying users when refilling or cartridge replacement is required.

[0018] Other obj ects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.SUMMARY OF THE INVENTION

[0019] The present invention relates to an aerosol -generating device that enables direct measurement of the aerosol -generating substrate level in real-time. The device consists of a body and a cartridge. The body includes a control unit, an energy source, heater termination connections, and a charging port, while the cartridge houses a heater, an aerosol-generating substrate, a condensation chamber, and connector pins. The condensation chamber features capacitance sensing portions, with the aerosol-generating substrate serving as a dielectric medium. Thecontrol unit measures substrate levels in real-time by detecting capacitance variations and regulates heater activation to prevent thermal stress, avoid dry inhalation, and maintain consistent aerosol quality.

[0020] The capacitance sensing portions are integrated directly into the condensation chamber using configurations such as metallic-coated walls, concentric metallic tubes, or metallic halves with insulated headings. These designs eliminate the need for external sensing plates. As a result, they simplify the cartridge structure and reduce manufacturing complexity. Additionally, the control unit enhances the lifespan of the heater by cutting off power when the substrate level is low, ensuring safe and efficient operation.

[0021] The invention also discloses a detailed method for accurately measuring the aerosol-generating substrate level. This method involves establishing electrical communication between the capacitance sensing portions of the condensation chamber and the energy source through terminals and a contact disc. The aerosolgenerating substrate acts as a dielectric medium, while the capacitance of the sensing portions is monitored in real-time. Variations in capacitance directly correspond to changes in the substrate level, reductions indicate substrate depletion during aerosol generation, whereas increases reflect substrate level increases around the sensing portions. This real-time monitoring enables the control unit to provide precise measurements, regulate heater activation effectively, and notify users when refilling or cartridge replacement is required. Thus, the invention delivers a reliable, efficient, and user-friendly solution for aerosol generation, optimizing energy usage, improving safety, and ensuring superior user experience.BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

[0022] The other objects, features and advantages will occur to those skilled in the art from the following description of the preferred embodiment and the accompanying drawings in which:

[0023] Figure 1 illustrates the structural arrangement of an aerosol -generating device (100) in accordance with an embodiment of the present invention.

[0024] Figure 2 is a diagrammatic representation of the cartridge (120) in the aerosol-generating device (100), illustrating the condensation chamber (132) with metallic-coated walls (133A, 134A) configuration, according to an embodiment of the present invention.

[0025] Figure 3 is a diagrammatic representation of the cartridge (120) in the aerosol-generating device (100), illustrating the condensation chamber (132) with concentric metallic tubes (133B, 134B) configuration, according to an embodiment of the present invention.

[0026] Figure 4 is a diagrammatic representation of the cartridge (120) in the aerosol-generating device (100), illustrating the condensation chamber (132) with metallic halves (133C) and insulated headings (134C) configuration, according to an embodiment of the present invention.LIST OF REFERENCE NUMERALS100 - Aerosol-generating device120 - Cartridge121 - Mouthpiece122 - Cartridge outer body123 - Cartridge bottom body124 - Bottom cover plate125 - Leak proof sleeve126 - Heater holder127 - Heater128 - Heater sleeve129 - Connector pin130 - Terminals131 - Contact disc132 - Condensation chamber133, 134 - Capacitance sensing portions133A - Metallic coating134A - Tube133B - Outer tube134B - Inner tube133C - Metallic halves134C - Insulated headings140 - Body141 - Control unit142 - Energy source143 - Charging portDETAILED DESCRIPTION OF THE INVENTION

[0027] The present invention may be embodied in several forms, and the details of embodiments of the present invention will be described in the following content with figures. The embodiments described below with reference to the drawings are merely illustrative of the technical solutions of the present disclosure but are not to be construed as limited to the technical solutions of the present disclosure.

[0028] The terms and words used in the following description and claims are not limited to the bibliographical meanings but are merely used by the inventor to enable a clear and consistent understanding of the invention. Accordingly, it should be apparent to those skilled in the art that the following description of the present invention is provided for illustration purposes only and not for the purpose of limiting the invention as defined by the appended claims. As used in the description of the invention and the appended claims, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

[0029] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in thecontext of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

[0030] The term “Cartridge” refers to a container that can hold the aerosol - generating substrate.

[0031] The present invention introduces a series of groundbreaking embodiments for an aerosol-generating device. This device enables direct measurement of the aerosol-generating substrate level in real-time by measuring the amount of liquid present in the cartridge. It utilizes a condensation chamber that acts as a capacitance sensing plate, eliminating the need for an additional sensing plate within the cartridge.

[0032] In the primary embodiment, the present invention discloses an aerosolgenerating device that enables direct measurement of the aerosol -generating substrate level in real-time. The device consists of two primary components: a body and a cartridge. The components in the body and cartridge are operably connected to ensure electrical communication and transfer control signals for precise control, efficient operation, and user-friendly functionality. The body incorporates essential elements such as a control unit, an energy source, heater termination connections, and a charging port. The cartridge houses a heater, an aerosol-generating substrate, a condensation chamber, and connector pins for establishing electrical connectivity with the body. The integration of these components ensures seamless operation and optimal performance, making the device compact and efficient.

[0033] In another embodiment, a key feature of the present invention is the condensation chamber, configured to condense vapor generated from the heater before passing it to the mouthpiece. It also acts as a capacitance sensing unit. The condensation chamber incorporates capacitance sensing portions to monitor the aerosol-generating substrate level. These sensing portions utilize the aerosolgenerating substrate as a dielectric medium between them, enabling real-time measurement of the substrate level based on capacitance variations. The invention offers various configurations for integrating the capacitance sensing portions intothe condensation chamber, including but not limited to metallic-coated parallel walls, concentric metallic tubes, and metallic halves joined by insulated headings. These designs eliminate the need for external sensing plates, simplifying the cartridge structure, reducing manufacturing complexity, and lowering production costs while maintaining measurement accuracy.

[0034] The capacitance sensing portions are designed to maintain consistent contact with the aerosol-generating substrate in the cartridge. This contact ensures accurate and reliable measurements of the substrate level, even as it depletes during use. The sensing portions are configured to remain in continuous engagement with the substrate until it is fully consumed, thereby enhancing the precision of the capacitance-based monitoring system. This feature is critical for maintaining the device's performance and ensuring optimal user satisfaction.

[0035] In yet another embodiment, the present invention includes a control unit that is central to the device’s operation, as it regulates the activation of the heater based on the measured substrate level. By monitoring capacitance changes, the control unit ensures that the heater is activated only when the substrate level is sufficient, thereby preventing thermal stress on the heater and avoiding the generation of dry inhalation. This control mechanism maintains consistent aerosol quality, ensuring superior user experience. Furthermore, the control unit deactivates the electrical connection between the heater and the energy source when the substrate is depleted or insufficient to generate quality aerosol, enhancing safety and preventing overheating and thermal stress on the heater, significantly extending its lifespan.

[0036] In yet another embodiment, the present invention discloses a detailed method for measuring the aerosol-generating substrate level. This method involves establishing electrical communication between the capacitance sensing portions of the condensation chamber and the energy source via terminals and a contact disc, where the aerosol-generating substrate acts as a dielectric medium between the capacitance sensing portions. The sensing portions continuously monitor the capacitance within the chamber, which is directly proportional to the substrate level. As the substrate is consumed during aerosol generation, capacitance decreases dueto the reduced dielectric medium. Conversely, when substrate level increases around the sensing portions, capacitance increases. This dynamic measurement allows the control unit to track substrate levels in real-time. Additionally, the control unit processes this data to determine when the substrate level is critically low and automatically deactivates the heater to prevent dry inhalation and thermal stress. This method ensures precise monitoring, reduces operational risks, and optimizes device performance.

[0037] In yet another embodiment, the present invention focuses on user notifications through any possible mode of communication, including but not limited to an indicator light or alert system in the aerosol -generating device and notifications on the user device. The control unit is programmed to provide realtime notifications to the user regarding the substrate level. This feature enables users to make timely decisions about refilling or replacing the cartridge, ensuring uninterrupted operation of the device. By providing accurate and reliable information, the invention enhances user convenience and satisfaction. Additionally, the simplified design of the cartridge, achieved by integrating the capacitance sensing portions directly into the condensation chamber, ensures easy assembly, maintenance, and replacement.

[0038] Overall, these embodiments provide an aerosol -generating device that enables direct measurement of the aerosol -generating substrate level in real-time. The condensation chamber integrates capacitance sensing portions that use the substrate as a dielectric medium to measure its level based on capacitance variations. The sensing portions maintain direct contact with the substrate, ensuring accurate monitoring until depletion. The control unit regulates heater activation based on substrate levels, preventing thermal stress, overheating, and dry inhalation generation while ensuring consistent aerosol quality. A method is included for realtime substrate measurement, utilizing dynamic capacitance changes to optimize performance and safety. The device also provides user feedback for timely refilling or cartridge replacement, features a simplified design for ease of maintenance, andenhances energy efficiency and heater lifespan, offering a compact, reliable, and user-friendly solution.

[0039] With reference to Figures 1-4, the aerosol-generating device (100) according to the present invention enables direct measurement of the aerosolgenerating substrate level in real-time. The device (100) consists of two primary components: a body (140) and a cartridge (120). The body (140) incorporates essential elements such as a control unit (141), an energy source (142), and a charging port (143). The cartridge (120) houses a heater holder (126), which includes a heater (127), a heater sleeve (128), and connector pins (129). Additionally, the cartridge (120) is structured with an outer body (122), a bottom body (123), and a bottom cover plate (124), incorporating essential elements such as a leak-proof sleeve (125), a condensation chamber (132), terminals (130), and a contact disc (131). At one end of the cartridge (120), a mouthpiece (121) is attached. As illustrated, the components in the body (140) and cartridge (120) are operably connected to ensure electrical communication and transfer control signals for precise control, efficient operation, and user-friendly functionality.

[0040] With reference to Figure 1, the body (140) is the bottom portion of the aerosol-generating device (100), wherein the charging port (143) is utilized to recharge the energy source (142), which ensures the required electrical power to the heater (127). For sensing capacitance variance, the condensation chamber (132) is in electrical communication with the control unit (141) through terminals (130) and the contact disc (131).

[0041] With reference to Figures 1 - 4, the cartridge (120) is the top portion of the aerosol-generating device (100), wherein the aerosol is generated by heating the aerosol-generating substrate contained within it. The cartridge (120) is structured with an outer body (122), a bottom body (123), and a bottom cover plate (124). One end of the outer body (122) is removably attached to the mouthpiece (121), while the other end is connected to the bottom body (123) and the bottom cover plate (124). The bottom cover plate (124) is removably attached to the body (140) andcontains a leak-proof sleeve (125) to prevent leakage of the aerosol -generating substrate contained in the cartridge (120) into the body (140).

[0042] With reference to Figures 2 - 4, the cartridge (120) houses the heater holder (126), which includes the heater (127), the heater sleeve (128), and connector pins (129). The connector pins (129) in the heater holder (126) securely transfer electrical energy to the heater (127). The heater converts this electrical energy into thermal energy to generate aerosol by vaporizing the aerosol-generating substrate in the cartridge (120). The heater (127) is securely enclosed by the heater sleeve (128) to prevent short circuits.

[0043] Additionally, the cartridge (120) incorporates the condensation chamber (132), which is one of the core embodiments of the invention. The condensation chamber (132) is immersed in the aerosol -generating substrate contained in the cartridge (120) and is configured to condense vapor generated from the heater (127) before passing it to the mouthpiece (121). In addition to this functionality, the condensation chamber (132) acts as a capacitance sensing unit. For this additional functionality, it incorporates capacitance sensing portions (133, 134) to measure the aerosol-generating substrate level. The capacitance sensing portions (133, 134) are in electrical communication with the control unit (141) via terminals (130) and the contact disc (131) for capacitance charging. These sensing portions (133, 134) are in direct contact with the aerosol -generating substrate and utilize it as a dielectric medium between them. Changes in the aerosol -generating substrate level are directly proportional to the capacitance change in these portions (133, 134). This feature enables real-time measurement of substrate levels based on capacitance variations.

[0044] The invention offers various configurations for integrating the capacitance sensing portions (133, 134) into the condensation chamber. In one embodiment, with reference to Figure 2, the capacitance sensing portions (133, 134) are represented as a metallic coating (133A) and a tube (134A). At least two opposite parallel wall portions of the tube (134A) being metallic-coated (133A) and designed to make contact with the aerosol-generating substrate between them. Once electricalconnection is established on these metallic coatings (133A), they act as capacitance sensors utilizing the aerosol-generating substrate as a dielectric medium between them. The uncoated portions of the tube (134A) act as insulators between the electrical terminals. The level of aerosol-generating substrate between these metallic coatings (133A) is directly proportional to the capacitance change. Based on capacitance variations, the aerosol -generating substrate in the cartridge (120) is accurately calculated with the help of the control unit (141) program.

[0045] In another embodiment, with reference to Figure 3, the capacitance sensing portions (133, 134) are represented as an outer tube (133B) and an inner tube (134B). The tubes are metallic and structured in a concentric manner, featuring at least two concentric metallic tubes (133B, 134B) designed to make contact with the aerosol-generating substrate between them. Once electrical connection is established between the outer tube (133B) and the inner tube (134B), they act as capacitance sensors utilizing the aerosol-generating substrate as a dielectric medium. The level of aerosol -generating substrate between the outer tube (133B) and the inner tube (134B) is directly proportional to the capacitance change. Based on capacitance variations, the aerosol -generating substrate in the cartridge (120) is accurately calculated with the help of the control unit (141) program.

[0046] In yet another embodiment, with reference to Figure 4, the capacitance sensing portions (133, 134) are represented as metallic halves (133C) and insulated headings (134C). The wall of the condensation chamber (132) is split into at least two metallic halves (133C) connected by insulated headings (134C), thereby forming a chamber that makes contact with the aerosol -generating substrate between the metallic halves (133C). Once electrical connection is established on these metallic halves (133C), they act as capacitance sensors utilizing the aerosol - generating substrate as a dielectric medium between them. The insulated headings (134C) serve as insulators between the electrical terminals. The level of aerosolgenerating substrate between these metallic halves (133C) is directly proportional to the capacitance change. Based on capacitance variations, the aerosol-generatingsubstrate in the cartridge (120) is accurately calculated with the help of the control unit (141) program.

[0047] The present invention offers various configurations for integrating the capacitance sensing portions (133, 134) into the condensation chamber (132). The embodiments listed above are some of the variations, but the invention is not limited to them. The core concept of the invention is that the condensation chamber (132), immersed in the aerosol-generating substrate, incorporates at least two capacitance sensing portions (133, 134). These designs eliminate the need for external sensing plates, simplifying the cartridge (120) structure, reducing manufacturing complexity, and lowering production costs while maintaining measurement accuracy.

[0048] In all the above configurations, the capacitance sensing portions (133, 134) are designed to maintain consistent contact with the aerosol-generating substrate in the cartridge (120). This contact ensures accurate and reliable measurements of the substrate level, even as it depletes during aerosol generation. The sensing portions (133, 134) are configured to remain in continuous engagement with the substrate until the substrate is depleted, thereby enhancing the precision of the aerosolgenerating device (100), which enables direct measurement of the aerosolgenerating substrate level in real-time. This feature is critical for maintaining the device's (100) performance and ensuring optimal user satisfaction.

[0049] With reference to Figures 1-4, the control unit (141) is central to the operation of the aerosol -generating device (100), as it regulates the activation of the heater (127) based on the measured substrate level determined from capacitance variations. By monitoring these capacitance variations, the control unit (141) ensures that the heater (127) is activated only when the substrate level is sufficient, thereby preventing thermal stress on the heater (127) and avoiding dry inhalation. This control unit maintains consistent aerosol quality, ensuring superior user experience. Furthermore, it cuts off electrical power between the heater (127) and energy source (142) when the substrate is depleted or substantially low to generate quality aerosol, enhancing user satisfaction by preventing dry inhalation.Additionally, it enhances the lifespan of the heater (127) by preventing overheating and thermal stress.

[0050] The method for measuring the aerosol -generating substrate level in the aerosol-generating device (100) involves establishing electrical communication between the capacitance sensing portions (133, 134) of the condensation chamber (132) and the control unit (141) via terminals (130) and a contact disc (131). This process utilizes the aerosol-generating substrate as a dielectric medium between the capacitance sensing portions (133, 134). The method includes monitoring capacitance within the condensation chamber (132), which is directly proportional to the substrate level; detecting a reduction in capacitance during aerosol generation as the substrate level decreases. The control unit (141) is programmed to measure this substrate level in real-time based on capacitance variance. Additionally, it processes this data to determine when the substrate level is substantially low and automatically deactivates the heater (127) to prevent dry inhalation and thermal stress. This method ensures precise monitoring, reduces operational risks, and optimizes device performance.

[0051] The present invention also enables user notifications through various modes of communication, including but not limited to an indicator light or alert system in the aerosol-generating device (100) and notifications on the user’s device. The control unit (141) is programmed to provide real-time information to the user regarding the substrate level. This feature allows users to make timely decisions about refilling or replacing the cartridge (120), ensuring uninterrupted operation of the device (100). By providing accurate and reliable information, the invention enhances user convenience and satisfaction. Additionally, the simplified design of the cartridge (120), achieved by integrating the capacitance sensing portions (133, 134) directly into the condensation chamber (132), ensures easy assembly, maintenance, and replacement.

[0052] The aerosol-generating device (100) disclosed herein enables direct measurement of the aerosol-generating substrate level in real-time. The condensation chamber (132) integrates capacitance sensing portions (133, 134) thatutilize it as a dielectric medium to measure its level based on capacitance variations. The sensing portions (133, 134) maintain direct contact with the substrate, ensuring accurate monitoring until depletion. The control unit (141) regulates the activation of the heater (127) based on substrate levels, preventing thermal stress, overheating, and dry inhalation. The device (100) also provides user notifications for timely refilling or replacement of the cartridge (120), features a simplified design for ease of maintenance, and enhances energy efficiency and the lifespan of the heater (127), offering a compact, reliable, and user-friendly solution.

[0053] The present invention may take many forms and modifications, and the specific embodiments thereof have been shown by way of example in the drawings and are herein described in detail. It should be understood, however, that the invention is not to be limited to the particular forms set forth in the detailed description, but rather to include all modifications and equivalents within the spirit and scope of the invention as defined.

Claims

CLAIMS1. An aerosol -generating device (100), comprising: a body (140) comprising a control unit (141), an energy source (142), and a charging port (143); a cartridge (120) comprising a heater (127), an aerosol -generating substrate, a condensation chamber (132), and a connector pin (129); wherein condensation chamber (132), immersed in the aerosolgenerating substrate, incorporates at least two capacitance sensing portions (133, 134); wherein the aerosol -generating substrate acts as a dielectric medium between the capacitance sensing portions (133, 134); wherein the control unit (141) is programmed to: measure the level of the aerosol-generating substrate in the condensation chamber (132) based on capacitance variance; and regulate the heater (127) activation based on the substrate level to prevent thermal stress on the heater (127) and avoid dry inhalation.

2. The aerosol -generating device (100) as claimed in claim 1, wherein the capacitance sensing portions (133, 134) are integrated into the condensation chamber (132), with at least two opposite parallel wall portions of the tube (134A) being metallic-coated (133 A) and designed to make contact with the aerosol-generating substrate between them.

3. The aerosol -generating device as claimed in claim 1, wherein the capacitance sensing portions (133, 134) are integrated into the condensation chamber (132), featuring at least two concentric metallic tubes (133B,134B) designed to make contact with the aerosol -generating substrate between them.

4. The aerosol -generating device as claimed in claim 1, wherein the capacitance sensing portions (133, 134) are integrated into the condensation chamber (132), with the wall of the condensation chamber (132) split into at least two metallic halves (133C) connected by insulated headings (134C), thereby forming the chamber to make contact with the aerosol -generating substrate between the metallic halves (133C).

5. The aerosol -generating device (100) as claimed in claim 1, wherein the capacitance sensing portions (133, 134) of the condensation chamber (132) are in direct contact with the aerosol-generating substrate.

6. The aerosol-generating device as claimed in claim 5, wherein the capacitance sensing portions (133, 134) are designed to maintain consistent contact with the aerosol-generating substrate until the substrate is depleted.

7. The aerosol-generating device as claimed in claim 1, wherein the control unit (141) regulates heater (127) based on the aerosol -generating substrate level.

8. The aerosol-generating device as claimed in claim 8, wherein the control unit (141) cuts off electrical power to the heater (127) when the aerosolgenerating substrate level is depleted or substantially low to generate quality aerosol, ensuring user satisfaction by avoiding dry inhalation.

9. The aerosol-generating device as claimed in claim 1, wherein the control unit (141) enhances the lifespan of the heater (127) by preventing overheating and thermal stress.

10. A method of measuring the aerosol -generating substrate level in an aerosolgenerating device, comprising:establishing electrical communication between the capacitance sensing portions (133, 134) of the condensation chamber (132) and the energy source (142) via terminals (130) and a contact disc (131); utilizing the aerosol -generating substrate as a dielectric medium between the capacitance sensing portions (133, 134); monitoring the capacitance within the condensation chamber (132), which is directly proportional to the substrate level; detecting a reduction in capacitance during aerosol generation as the substrate level decreases; programming the control unit (141) to measure the aerosol-generating substrate level in real-time based on capacitance variance.

11. The method as claimed in claim 11, wherein the direct measurement of the aerosol-generating substrate level via capacitance variance provides accurate, real-time information to the user.

12. The method as claimed in claim 11, wherein the user is informed of the aerosol-generating substrate level, enabling effective decisions regarding refilling or replacement of cartridge (120).

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