Aerosol-generating device with electronic sensor adjustment component
The aerosol-generating device uses a sensing assembly with adjustable electromagnetic radiation detection to reliably identify aerosol-generating articles under varying lighting conditions, enhancing detection accuracy and preventing false rejections.
Patent Information
- Application Number
- PCT/CN2024/082454
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- Filing Date
- 2024-03-19
- Publication Date
- 2025-09-25
AI Technical Summary
Aerosol-generating devices struggle to reliably identify and distinguish between authorized and counterfeit aerosol-generating articles, particularly under varying lighting conditions, which affects user experience and detection reliability.
The device incorporates a sensing assembly with an emitter and sensor that emit and detect electromagnetic radiation of a predetermined spectrum, adjusted by an electronic sensor adjustment component to account for ambient light conditions, using gain-selectable amplifiers and filters to enhance detection accuracy.
Enables reliable identification of aerosol-generating articles regardless of lighting conditions, preventing false rejections and improving detection reliability by distinguishing between compatible and incompatible articles.
Smart Images

Figure CN2024082454_25092025_PF_FP_ABST
Abstract
Description
AEROSOL-GENERATING DEVICE WITH ELECTRONIC SENSOR ADJUSTMENT COMPONENT
[0001] The present invention relates to an aerosol-generating device, an aerosol-generating system and a method for identifying an aerosol-generating article.
[0002] It is known to provide an aerosol-generating device for generating an inhalable vapor. Such devices may heat aerosol-forming substrate to a temperature at which one or more components of the aerosol-forming substrate are volatilised without burning the aerosol-forming substrate. Aerosol-forming substrate may be provided as part of an aerosol-generating article. The aerosol-generating article may have a rod shape for insertion of the aerosol-generating article into a cavity, such as a heating chamber, of the aerosol-generating device. A heating element may be arranged in or around the heating chamber for heating the aerosol-forming substrate once the aerosol-generating article is inserted into the heating chamber of the aerosol-generating device. Aerosol-generating devices are typically designed to operate best when used with an original and specifically designed aerosol-generating article. Furthermore, manufacturers of aerosol-generating articles may offer a product line of an aerosol-generating article in a variety of types with different characteristics, such as flavor or nicotine content.
[0003] It would be desirable to provide an aerosol-generating device capable of identifying an aerosol-generating article. It would be desirable to provide an aerosol-generating device capable of detecting an authorized aerosol-generating article. It would be desirable to provide an aerosol-generating device capable of detecting an aerosol-generating article with enhanced reliability. It would be desirable to provide an aerosol-generating device with improved detection capabilities. It would be desirable to have an aerosol-generating device providing an optimized user experience. It would be desirable to have an aerosol-generating article enabling improved identification by an aerosol-generating device. It would be desirable to have an aerosol-generating article enabling identification by an aerosol-generating device, regardless an ambient electromagnetic radiation. It would be desirable to have an aerosol-generating article enabling identification by an aerosol-generating device, regardless a lighting condition.
[0004] According to an embodiment of the invention there may be provided an aerosol-generating device for generating aerosol from an aerosol-forming article. The aerosol-generating device may comprise a sensing assembly. The sensing assembly may comprise an emitter configured to emit electromagnetic radiation of a predetermined spectrum. The sensing assembly further may comprise a sensor configured to detect the electromagnetic radiation of the predetermined spectrum and ambient electromagnetic radiation. The sensing assembly further may comprise at least one electronic sensor adjustment component configured to adjust the sensor based on the detected ambient electromagnetic radiation.
[0005] According to an embodiment of the invention there is provided an aerosol-generating device for generating aerosol from an aerosol-forming article. The aerosol-generating device comprises a sensing assembly. The sensing assembly comprises an emitter configured to emit electromagnetic radiation of a predetermined spectrum. The sensing assembly further comprises a sensor configured to detect the electromagnetic radiation of the predetermined spectrum and ambient electromagnetic radiation. The sensing assembly further comprises at least one electronic sensor adjustment component configured to adjust the sensor based on the detected ambient electromagnetic radiation.
[0006] As used herein “predetermined spectrum” may relate to electromagnetic radiation with a particular set of one or more wavelengths or a range of wavelengths. The range of wavelength may be between 1100 nanometers and 1500 nanometers. Preferably, the range of wavelength may be between 1350 nanometers and 1400 nanometers. In this regard, electromagnetic radiation with a predetermined spectrum may be emitted by the emitter for identifying the aerosol-generating article. Further, the electromagnetic radiation with the predetermined spectrum may be reflected or absorbed and reemitted on a taggant or signature of an aerosol-generating article. Further, the electromagnetic radiation with the predetermined spectrum may be detected by a sensor. Using electromagnetic radiation with the predetermined spectrum may allow a controller to distinguish between detected ambient electromagnetic radiation and the detected electromagnetic radiation with the predetermined spectrum. Using electromagnetic radiation with the predetermined spectrum may allow identifying aerosol-generating articles, which are compatible with the aerosol-generating device. Using electromagnetic radiation with the predetermined spectrum may allow identifying counterfeit aerosol-generating articles and aerosol-generating articles, which are not compatible with the aerosol-generating device.
[0007] As used herein “ambient electromagnetic radiation” may relate to any electromagnetic radiation produced externally from the aerosol-generating device. Ambient electromagnetic radiation may include ambient light, such as sun light. Ambient light may relate to electromagnetic radiation with a wavelength range of 380 to 700 nm, preferably visible light. Ambient light may relate to electromagnetic radiation with a wavelength range of 100 to 380 nm.Ambient light may relate to general lighting conditions, such as bright or dark lighting conditions. Ambient light may further include light produced from artificial light sources not belonging to the aerosol-generating device, such as light bulbs, light tubes, LEDs, and others.
[0008] Adjusting the sensor with the sensor adjustment component based on the detected ambient light may allow reliable detection of the aerosol-generating article with the aerosol-generating device. This may particularly enable detection of the aerosol-generating article regardless the lighting conditions. As a result, the aerosol-generating article may be detected by the aerosol-generating device in particularly bright lighting conditions, e.g. when the aerosol-generating device is exposed to sunlight or to bright room light. The electronic sensor adjustment component may further enable detection of the aerosol-generating article in darker lighting conditions, e.g. in the evening, in the night, or in darker rooms. The electronic sensor adjustment component may further improve detection of the aerosol-generating article by the aerosol-generating device. The electronic sensor adjustment component may further prevent incorrect rejection of the aerosol-generating article as a counterfeit aerosol-generating article.
[0009] The sensor may be configured to detect an intensity of the ambient electromagnetic radiation. The sensor may be configured to detect an intensity of the electromagnetic radiation of the predetermined spectrum. The sensor may detect an intensity of at least one wavelength of the ambient electromagnetic radiation. The sensor may detect an intensity of at least one wavelength of the electromagnetic radiation of the predetermined spectrum. The sensor may detect an intensity of a range of wavelengths of the electromagnetic radiation of the predetermined spectrum.
[0010] The sensor may produce a sensor output based on the detected electromagnetic radiation of the predetermined spectrum and / or on the ambient electromagnetic radiation. The sensor output may include one or both of an article output and an ambient output. The article output may be based on the detected electromagnetic radiation of the predetermined spectrum. The ambient output may be based on the detected ambient electromagnetic radiation. The ambient output may be a DC offset.
[0011] The electronic sensor adjustment component may adjust the sensor based on the detected intensity of the ambient electromagnetic radiation. Alternatively, the electronic sensor adjustment component may be applied to the sensor output.
[0012] The aerosol-generating device may further comprise a controller. The controller may be configured to determine the aerosol-generating article based on the detected electromagnetic radiation of the predetermined spectrum.
[0013] The controller may be configured to receive the intensity of the detected ambient electromagnetic radiation as one of a current or voltage. The at least one electronic sensor adjustment component. One or both of the controller and amplifier may receive the sensor output, preferably simultaneously.
[0014] The at least one electronic sensor adjustment component may be an operational amplifier. The operational amplifier may be a gain-selectable amplifier. The gain-selectable amplifier may be configured to adjust the gain of the sensor’s detection.
[0015] As used herein ‘gain’ may relate to a sensor’s sensitivity and / or a sensitivity of the gain selectable amplifier. In this regard, adjusting the gain may relate to adjusting the sensor’s sensitivity and / or the sensitivity of the gain-selectable amplifier. The gain may be high gain or low gain.
[0016] Adjusting the sensor’s gain and or the gain-selectable amplifier’s gain to high gain may relate to adjusting the sensor and / or the gain-selectable amplifier to a higher sensitivity. In other words, the sensor and / or the gain-selectable amplifier adjusted to high gain may detect a wider range of intensities. This may be advantageous in areas with darker lighting conditions. Further, this may be advantageous when electromagnetic radiation with a range of weaker intensities may be present, which may not be registered by the sensor in its standard configuration. Adjusting the sensor and / or the gain-selectable amplifier to high gain may include further ranges of intensities during detection. Thereby, the sensor and / or the gain-selectable amplifier adjusted to high gain may detect the range of weaker intensities.
[0017] Adjusting the sensor’s gain and or the gain-selectable amplifier’s gain to low gain may relate to adjusting the sensor and / or the gain-selectable amplifier to a lower sensitivity. In other words, the sensor and / or the gain-selectable amplifier adjusted to low gain may detect a limited range of intensities. This may be advantageous in areas with brighter lighting conditions. Further, this may be advantageous when the sensor may detect electromagnetic radiation with a range of intensities, which may oversaturate the sensor in its standard configuration. Adjusting the sensor and / or the gain-selectable amplifier to low gain may exclude the range of intensities possibly oversaturating the sensor during detection. Thereby, the sensor and / or the gain-selectable amplifier adjusted to low gain may not detect the range of intensities possibly oversaturating the sensor.
[0018] The gain-selectable amplifier may adjust the gain of the sensor’s detection via a feedback loop. The gain-selectable amplifier may adjust the gain of the sensor’s detection, such that the sensor may detect primarily, preferably solely, the electromagnetic radiation of the predetermined spectrum. Detecting solely the electromagnetic radiation may result in the sensor output primarily including, preferably consisting of, the article output. Thereby, the aerosol-generating article can be detected and identified in brighter or darker lighting conditions.
[0019] Alternatively, the controller may be configured to adjust the gain-selectable amplifier to low gain or to high gain, based on the intensity of the detected ambient electromagnetic radiation.
[0020] The gain-selectable amplifier may be configured to adjust the sensor to low gain, when the intensity of the detected ambient electromagnetic radiation exceeds a certain threshold, preferably 500 W / m2.
[0021] The gain-selectable amplifier may be configured to adjust the sensor to high gain, when the intensity of the detected ambient electromagnetic radiation falls below the certain threshold, preferably 500 W / m2. Preferably, the gain-selectable amplifier may be set by default to high gain.
[0022] Exemplarily, when the controller may adjust the gain-selectable amplifier to low gain, the controller may activate a circuitry, the circuitry preferably comprising a resistor.
[0023] The sensor may primarily detect the electromagnetic radiation of the predetermined spectrum, when being adjusted to low gain. The sensor may be configured to not detect the ambient electromagnetic radiation, when being adjusted to low gain. The adjusted sensor may produce an adjusted sensor output. The adjusted sensor output may primarily include an article output, when the sensor is adjusted to high gain.
[0024] The controller may be configured to determine the aerosol-generating article after the sensor may have been adjusted by the gain-selectable amplifier.
[0025] The controller may be configured to adjust the gain-selectable amplifier to low gain, when the intensity of the detected ambient electromagnetic radiation exceeds a certain threshold, preferably 500 W / m2.
[0026] The controller may be configured to adjust the gain-selectable amplifier to high gain, when the intensity of the detected ambient electromagnetic radiation falls below the certain threshold, preferably 500 W / m2.
[0027] The controller may be configured to activate only the sensor and the gain-selectable amplifier after starting the aerosol-generating device.
[0028] The controller may be configured to activate the emitter after the gain-selectable amplifier has been adjusted to low gain or high gain.
[0029] The at least one electronic sensor adjustment component may be an electronic filter. As used herein ‘electronic filter’ may relate to an electronic component, which may be applied to signals. The electronic filter may prevent a certain range of a signal to pass through the electronic filter. An electronic filter may be applied to the signal output generated by the sensor.
[0030] The electronic filter may be applied to the sensor output. The electronic filter may be applied to the sensor output to reduce the ambient output. The electronic filter may be applied to the sensor output to remove a certain range of the sensor output, preferably the ambient output.
[0031] The electronic filter may be configured to prevent the ambient output from passing through the electronic filter to the controller. The electronic filter may be configured to remove the ambient output from the sensor output partially, preferably entirely.
[0032] The electronic filter may be configured to let the article output pass through. The controller may receive only the article output, preferably when the electronic filter is applied to the sensor output. Thereby, the aerosol-generating article may be identified more reliable by the controller.
[0033] The electronic filter may be a passive electronic filter. The passive electronic filter may be a high-pass filter. The passive electronic filter may be a low-pass filter. The passive electronic filter may be a bandpass filter.
[0034] The at least one electronic sensor adjustment component may be an AC coupling. The AC coupling may be configured to remove the ambient output. The at least one electronic sensor adjustment component may be a DC coupling. The DC coupling may be configured to remove the ambient output.
[0035] The at least one electronic sensor adjustment component may be a Zero-drift amplifier, preferably one of an Auto-Zero amplifier or Chopper amplifier.
[0036] The at least one electronic sensor adjustment component may be a Lock-in amplifier. The Lock-in amplifier may modulate the signal output.
[0037] According to an embodiment of the invention there may be provided a method for determination of an aerosol-generating article with an aerosol-generating device. The method may comprise the steps of: emitting electromagnetic radiation of a predetermined spectrum with an emitter, detecting an intensity of ambient electromagnetic radiation with a sensor, adjusting the sensor based on the detected intensity of the ambient electromagnetic radiation, and detecting the electromagnetic radiation of the predetermined spectrum with the adjusted sensor, and determining the aerosol-generating article with a controller based on the detected electromagnetic radiation of the predetermined spectrum.
[0038] According to an embodiment of the invention there is provided a method for determination of an aerosol-generating article with an aerosol-generating device. The method comprises the steps of: emitting electromagnetic radiation of a predetermined spectrum with an emitter, detecting an intensity of ambient electromagnetic radiation with a sensor, adjusting the sensor based on the detected intensity of the ambient electromagnetic radiation, and detecting the electromagnetic radiation of the predetermined spectrum with the adjusted sensor, and determining the aerosol-generating article with a controller based on the detected electromagnetic radiation of the predetermined spectrum.
[0039] The method may include that the sensor may further be configured to measure at least one wavelength of the detected ambient electromagnetic radiation. The sensor may further be configured to measure an intensity of the at least one wavelength of the detected ambient electromagnetic radiation.
[0040] The method may include that the at least one electronic sensor adjustment component may further be a gain-selectable amplifier adjustable by the controller.
[0041] The method may include that the controller may further adjust the gain-selectable amplifier to low gain, when the sensor measures an intensity of the detected ambient electromagnetic radiation exceeding a certain threshold, preferably 500 W / m2.
[0042] The method may include that the controller may further adjust the gain-selectable amplifier to high gain, when the sensor measures an intensity of ambient electromagnetic radiation falling below the certain threshold, preferably 500 W / m2.
[0043] According to an embodiment of the invention there may be provided an aerosol-generating system comprising an aerosol-generating article and an aerosol-generating device. The aerosol-generating system may be configured to reflect the electromagnetic radiation of the predetermined spectrum on the aerosol-generating article, preferably a taggant signature, when the aerosol-generating article may be received in a cavity.
[0044] According to an embodiment of the invention there may be provided an aerosol-generating device for generating aerosol from an aerosol-forming article. The aerosol-generating device may comprise a housing defining a cavity for at least partially receiving the aerosol-forming article. The aerosol-generating device may comprise a sensing assembly. The sensing assembly may comprise an emitter configured to emit electromagnetic radiation into the cavity. The sensing assembly further may comprise a sensor configured to detect electromagnetic radiation. The sensing assembly further may comprise at least one shielding component configured to partially, preferably completely, shield the sensor from ambient electromagnetic radiation.
[0045] According to an embodiment of the invention there is provided an aerosol-generating device for generating aerosol from an aerosol-forming article. The aerosol-generating device comprises a housing defining a cavity for at least partially receiving the aerosol-forming article. The aerosol-generating device comprises a sensing assembly. The sensing assembly comprises an emitter configured to emit electromagnetic radiation into the cavity. The sensing assembly further comprises a sensor configured to detect electromagnetic radiation. The sensing assembly further comprises at least one shielding component configured to partially, preferably completely, shield the sensor from ambient electromagnetic radiation.
[0046] The aerosol-generating device may comprise a cavity. The cavity may be configured to receive the aerosol-generating article. The cavity may be configured to partially receive an aerosol-generating article.
[0047] The cavity of the aerosol-generating device may have an open end into which the aerosol-generating article is inserted. The open end may be a proximal end. The open end may be connected to a top housing. The top housing may be connected to the open end frictionally via a rib.
[0048] The cavity may have a closed end opposite the open end. The closed end may be the base of the cavity. The closed end may be closed except for the provision of air apertures arranged in the base. The base of the cavity may be flat. The base of the cavity may be circular. The base of the cavity may be arranged upstream of the cavity. The open end may be arranged downstream of the cavity. The cavity may have an elongate extension. The cavity may have a longitudinal central axis. A longitudinal direction may be the direction extending between the open and closed ends along the longitudinal central axis. The longitudinal central axis of the cavity may be parallel to the longitudinal axis of the aerosol-generating device.
[0049] The cavity may be configured as a heating chamber. The cavity may have a cylindrical shape. The cavity may have a hollow cylindrical shape. The cavity may have a shape corresponding to the shape of the aerosol-generating article to be received in the cavity. The cavity may have a circular cross-section. The cavity may have an elliptical or rectangular cross-section. The cavity may have an inner diameter corresponding to the outer diameter of the aerosol-generating article.
[0050] An airflow channel may run through the cavity. Ambient air may be drawn into the aerosol-generating device, into the cavity and towards the user through the airflow channel. Downstream of the cavity, a mouthpiece may be arranged or a user may directly draw on the aerosol-generating article. The airflow channel may extend through the mouthpiece. The cavity may have a length of between 28 millimeters and 67 millimeters. The cavity may have a diameter of between 8 millimeters and 12 millimeters.
[0051] As used herein, the shielding component “shielding” the sensor from ambient electromagnetic radiation may relate to the shielding component preventing ambient electromagnetic radiation, such as sunlight, passing through to the sensor.
[0052] The shielding component may reduce the intensity of the ambient electromagnetic radiation at the receiver by at least 90%, preferably by at least 95%, even more preferably by at least 99%. The shielding component may be effective at reducing the intensity of electromagnetic radiation between the infrared range and the ultraviolet range.
[0053] The shielding component may be effective at reducing the intensity of ambient electromagnetic radiation having a wavelength between 1 nanometre and 100,000 nanometres, preferably between 200 nanometres and 30,000 nanometres, even more preferably between 200 nanometres and 15,000 nanometres. The shielding component may reduce the intensity of ambient electromagnetic radiation by absorption or reflection of the radiation.
[0054] The at least one shielding component may have a dark colour, preferably black.
[0055] The shielding component may be a shielding plate The shielding plate may be positioned externally to the cavity, such that the sensor may be arranged between the cavity and at least a portion of the shielding plate. The sensor may be arranged between a longitudinal center axis of the cavity and at least a portion of the shielding plate.
[0056] The emitter and the sensor may be positioned at substantially the same height with respect to the longitudinal axis of the cavity. In other words, the emitter and the sensor may be positioned in a plane that is substantially perpendicular to the longitudinal axis of the cavity. The emitter and the sensor may be positioned such that the beam of electromagnetic radiation travels in a direction substantially perpendicular to the longitudinal axis of the cavity from the emitter to the sensor. The cavity may comprise a second end opposite to the first end. The second end may comprise a base of the cavity. The emitter and sensor may be positioned so as to emit and receive electromagnetic radiation to and from the cavity at a region between the first and second end of the cavity. The emitter may be positioned outside of the cavity. The sensor may be positioned outside of the cavity. The emitter and sensor may be positioned distal to the second end of the cavity along the longitudinal axis of the cavity. The emitter and sensor may be positioned so as to emit and receive electromagnetic radiation to and from the second end of the cavity, respectively.
[0057] The aerosol-generating device may comprise at least one lens configured to focus electromagnetic radiation received from the cavity on to the sensor. The lens may comprise an absorption material configured to substantially block wavelengths of electromagnetic radiation that fall outside a range of wavelengths.
[0058] The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 200 nanometers and greater than 30,000 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 200 nanometers and greater than 20,000 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 200 nanometers and greater than 10,000 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 200 nanometers and greater than 5000 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 200 nanometers and greater than 2500 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 200 nanometers and greater than 2000 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 200 nanometers and greater than 1000 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 400 nanometers and greater than 2000 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 600 nanometers and greater than 2000 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 800 nanometers and greater than 2000 nanometers. The absorption material may be configured to substantially block wavelengths of electromagnetic radiation less than 1000 nanometers and greater than 2000 nanometers.
[0059] The one or more lenses may advantageously increase the amount of electromagnetic radiation received by the sensor. This may advantageously increase the signal to noise ratio of the sensing assembly and so improve the accuracy of the sensing assembly at detecting the presence and type of aerosol-forming substrate at least partially received in the cavity.
[0060] The emitter and the sensor may be parallel to one another. In other words, the angle between the emitter and the sensor may be about 0 degrees. Where the angle between the emitter and the sensor is referred to herein, the angle is defined between the central optical axis of the emitter and the central optical axis of the sensor. This may be the same as the angle defined between the surface of an aerosol-forming substrate or article at least partially received in the cavity and the emitter and sensor. The emitter and sensor may be next to one another. In this way, the emitter and the sensor may advantageously be provided on the same chip. This may advantageously reduce the complexity of the sensing assembly.
[0061] The emitter may be positioned adjacent to the sensor. The sensing assembly may comprise the emitter between the shielding plate and the sensor. Alternatively, the sensor and the emitter may be non-parallel.
[0062] The angle between the sensor and the emitter may be between 20 and 120 degrees, preferably between 60 and 100 degrees, even more preferably 70 and 90 degrees. Most preferably, the angle between the sensor and the emitter may be about 80 degrees. Such angles may be particularly advantageous when the aerosol-forming substrate is contained in a rod-shaped aerosol-generating article and the electromagnetic radiation is incident on the article perpendicular to the cylindrical axis of the rod.
[0063] The angle between the normal to the plane of the first substrate portion and the normal to the plane of the second substrate portion may be substantially the same as the angle between the sensor and the emitter when the sensor and the emitter are non-parallel. In other words, the angle between the normal to the plane of the first substrate portion and the normal to the plane of the second substrate portion may be between 20 and 120 degrees, preferably between 60 and 100 degrees, even more preferably 70 and 90 degrees. Most preferably, the angle may be about 80 degrees.
[0064] The emitter may be configured to emit electromagnetic radiation having a wavelength of between 1100 nanometers and 1500 nanometers. Preferably the emitter may be configured to emit electromagnetic radiation having a wavelength of between 1350 nanometers and 1400 nanometers.
[0065] The sensor may be configured to receive electromagnetic radiation having a wavelength of between 200 nanometers and 30,000 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 200 nanometers and 20,000 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 200 nanometers and 10,000 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 200 nanometers and 5000 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 200 nanometers and 2500 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 200 nanometers and 2000 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 400 nanometers and 2000 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 600 nanometers and 2000 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 800 nanometers and 2000 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 1000 nanometers and 2000 nanometers. Preferably, the sensor may be configured to receive electromagnetic radiation having a wavelength of between 1100 nanometers and 1500 nanometers. Preferably the sensor may be configured to receive electromagnetic radiation having a wavelength of between 1350 nanometers and 1400 nanometers.
[0066] Water is particularly effective at absorbing electromagnetic radiation having a wavelength between 1100 nanometers and 1500 nanometers, and in particular between 1350 nanometers and 1400 nanometers. Thus, it may be advantageous for the emitter and sensor to emit and receive such wavelengths of electromagnetic radiation when the material property of interest of the aerosol-forming substrate is wetness or water content.
[0067] The emitter may comprise at least one LED to emit the electromagnetic radiation. Preferably, the emitter may be configured to emit a plurality of wavelengths of electromagnetic radiation. The emitter may comprise a plurality of LEDs, each of the plurality of LEDs being configured to emit a different wavelength of electromagnetic radiation.
[0068] The sensor may comprise a photodiode.
[0069] The sensor may be configured to receive a plurality of wavelengths of electromagnetic radiation. In particular, the sensor may be configured to measure a plurality of wavelengths of the received electromagnetic radiation.
[0070] In other words, the sensing assembly may be configured to perform spectroscopy on an aerosol-forming substrate received in the cavity, or on an aerosol-generating article comprising the substrate received in the cavity. The device may comprise a controller to perform spectral analysis on the measured electromagnetic radiation. Based on the spectral analysis, the controller may be configured to determine the presence of an aerosol-forming substrate in the cavity. The controller may be configured to determine the type of aerosol-forming substrate in the cavity.
[0071] Herein, determining the presence and type of an aerosol-forming substrate is used interchangeably with determining the presence and type of an aerosol-generating article comprising an aerosol-forming substrate. In either case, the aerosol-generating device may advantageously be configured to determine the presence and type of the aerosol-forming substrate or article based on its chemical composition.
[0072] In one example, the electromagnetic radiation emitted by the emitter may be incident on an aerosol-forming substrate, in which case the presence or type of aerosol-forming substrate may be determined.
[0073] The sensing assembly may further comprise a substrate. The substrate may comprise a first side onto which at least one of the emitter and the sensor are attached. Both the emitter and the sensor may be attached to the first side. The substrate may comprise a second side, opposite the first side, onto which the shielding plate is attached. This may advantageously be a straightforward arrangement that is simple to manufacture. The substrate may comprise one or more Printed Circuit Boards (PCBs) . The substrate may be a Printed Circuit Board (PCB) . The substrate may comprise more than one PCB. The substrate may comprise or consist of one or more flexible PCBs.
[0074] The substrate may comprise a flexible portion. The flexible portion may be configured so that the emitter is moveable relative to the sensor by bending the flexible portion. As described above, the angle between the emitter and the sensor may preferably be between 20 and 120 degrees, preferably between 60 and 100 degrees, even more preferably 70 and 90 degrees. Most preferably, the angle between the sensor and the emitter may be about 80 degrees. A substrate comprising a flexible portion may advantageously allow the angle between the emitter and the sensor to be controlled in a simple way during the manufacturing process. Using a substrate comprising a flexible portion may advantageously remove the need for the substrate to be pre-moulded to a desired shape. It may be possible to modify the angle between the emitter and sensor during or after the manufacture of the aerosol-forming device.
[0075] The substrate may be bent such that the emitter is adjacent a different portion of the cavity to the sensor and such that the angle between the central optical axis of the emitter and sensor is between 20 degrees and 120 degrees, preferably between 60 and 100 degrees, even more preferably 70 and 90 degrees. Most preferably, the angle between the sensor and the emitter may be about 80 degrees. The substrate may comprise a first substrate portion comprising the emitter. The substrate may comprise a second substrate portion comprising the sensor. The substrate may comprise a third substrate portion between the first and second substrate portion. At least the third substrate portion may be flexible such that the first substrate portion is moveable relative to the second substrate portion. This may allow the angle between the emitter and the sensor to be controlled, as described above. Preferably, the first substrate portion of the substrate may be rigid. The second substrate portion of the substrate may be rigid. In this way, the flexible third substrate portion acts as a hinge between the rigid first and second substrate portions.
[0076] Preferably, the third substrate portion may be opaque to wavelengths of electromagnetic radiation emitted by the emitter. This may advantageously ensure that electromagnetic radiation emitted by the emitter is not directly received by the sensor before being reflected or absorbed and emitted by the aerosol-forming substrate received in the cavity.
[0077] The substrate may comprise one or more PCBs. The substrate may consist of one or more flexible PCBs. At least the third portion of the substrate may comprise or consist of a flexible PCB. Preferably, the first and second substrate portions of the substrate may comprise a rigid PCB and the third portion may comprise a flexible PCB.
[0078] A particularly preferable combination may be the substrate comprising a flexible portion, as described above, with the shielding plate as described above when the shielding plate comprises first and second planar portions, the second planar portion being planar in a plane that is different to the first planar portion. This is because the shielding plate may advantageously hold the substrate so that the flexible portion is bent at a desired angle.
[0079] The shielding plate may be configured to cover a major part of the sensor outside the cavity, preferably wherein the shielding plate covers the entire sensor external from the cavity. The shielding plate may be configured to shield the sensor from ambient electromagnetic radiation coming from more than one direction. The shielding plate may be configured to shield the sensor from ambient electromagnetic radiation coming from all directions.
[0080] The shielding plate may comprise at least one planar portion. The shielding plate may comprise a first planar portion. The shielding plate may comprise a second planar portion. The first planar portion and the second planar portion may be connected to each other. The first planar portion and the second planar portion may be connected to each other via a junction edge.
[0081] The first planar portion and the second planar portion may be non-co-planar. The first planar portion and the second planar portion may be lying in a plane parallel or along a longitudinal central axis of the aerosol-generating device.
[0082] The sensor may be positioned between the first planar portion of the shielding plate and the cavity. The emitter may be positioned between the second planar portion of the shielding plate and the cavity. The sensor may be positioned between the first planar portion of the shielding plate and the cavity and the emitter may be positioned between the second planar portion of the shielding plate and the cavity. This may advantageously ensure that ambient electromagnetic radiation does not enter the cavity through the sensor and / or the emitter.
[0083] The shielding plate may comprise a third planar portion. The third planar portion may be arranged perpendicular to the longitudinal axis of the cavity. The third planar portion may be connected to the first planar portion and the second planar portion.
[0084] The first planar portion, the second planar portion and the third planar portion may comprise the same material. The first planar portion, the second planar portion and the third planar portion may shield the sensor from ambient electromagnetic radiation. The first planar portion, the second planar portion and the third planar portion may comprise the same material The first planar portion, the second planar portion and the third planar portion may be connected to each other, preferably sealingly.
[0085] The shielding plate may comprise a U-section. The first planar portion and the second planar portion may be connected to each other via the U-section. The first planar portion may be connected to a first terminal edge of the U-section. The shielding plate may comprise a second planar portion. The second planar portion may be connected to a second terminal edge of the U-section.
[0086] The U-section of the shielding plate may define a U-shape by means of a bottom wall and parallel first and second side walls. Preferably, the parallel first and second side walls of the U-section of the shielding plate are non-coplanar to both the first planar portion and the second planar portion of the shielding plate.
[0087] The first and second terminal edges of the U-section may be defined by respective edges of the first and second side walls facing away from the bottom wall. Both the bottom wall and the parallel first and second side walls may be arranged in parallel to a longitudinal center axis of the cavity.
[0088] The first and second side walls of the U-section of the shielding plate may be arranged in parallel to an angle bisector of an angle spanned between the non-co-planar first and second planar portions of the shielding plate.
[0089] The bottom wall of the U-section may comprise a curved or bent shape. The bottom wall of the U-section may comprise a curved shape. The bottom wall of the U-section may comprise a bent shape.
[0090] The bottom wall of the U-section may contact an inner sidewall of the housing of the aerosol-generating device. The bottom wall of the U-section may comprise a curved or bent shape and may contact a correspondingly shaped inner sidewall of a housing of the aerosol-generating device. The inner sidewall may thus comprise a curved or bent shape fitting with the curved or bent shape of the bottom wall of the U-section in an area where the bottom wall of the U-section contacts the inner sidewall of the housing. This design may maximize the contact area between the shielding plate and the inner sidewall of the housing. Due to the higher contact area, heat dissipation from the shielding plate to the housing may be maximized.
[0091] The bottom wall of the U-section may comprise one or more fins in contact with the inner sidewall of the housing of the aerosol-generating device. The one or more fins may serve for dissipating heat away from the shielding plate to the housing of the device.
[0092] At least a portion of the inner sidewall of the housing of the aerosol-generating device being in contact with the bottom wall of the U-section may comprise graphene. A graphene sheet bay be provided on the outer surface of the inner sidewall of the housing being in contact with the bottom wall of the U-section.
[0093] The shielding plate may comprise a heat dissipation component.
[0094] The heat dissipation component may face a direction opposite to the cavity, preferably the housing. The heat dissipation component may contact the housing. The heat dissipation component may be connected to the housing. The heat dissipation component may comprise a first surface. The heat dissipation component may comprise a second surface. The first surface of the heat dissipation component may face a direction opposite the second surface of the heat dissipation component. The first surface of the heat dissipation component may face the housing. The second surface of the heat dissipation component may face the shielding plate. The first surface of the heat dissipation component may at least partially contact the housing. The entire first surface of the heat dissipation component may contact the housing. The first surface of the heat dissipation component may be connected to the housing. The first surface of the heat dissipation component may be arranged parallel to the housing.
[0095] The heat dissipation component may comprise at least one of aluminum and stainless steel. Preferably, the shielding plate is made of a phosphor bronze, preferably a nickel-plated Phosphor bronze. The heat dissipation component may be integral with the shielding component. The heat dissipation component may comprise the same material as the shielding component. The housing may comprise a thermally conductive material, preferably aluminum. The heat dissipation component comprising or consisting of a thermally conductive material may enable thermal conduction between the shielding plate and the housing. Heat generated by the heater assembly may be dissipated away from the sensor to the shielding plate and further to the housing, via the heat dissipation component contacting or being connected to the housing. Advantageously, the housing may act as a big heat sink, especially when the housing may comprise a thermally conductive material e.g., aluminum.
[0096] The heat dissipation component may be configured as a protrusion of the shielding plate. The heat dissipation component may be shaped as a hook, preferably a double hook. The heat dissipation component may comprise any other shape, which may be optimal for contacting the housing and dissipating heat away from the shielding plate to the housing.
[0097] The sensing assembly may comprise an aerogel layer or aerogel sheet. The aerogel layer or aerogel sheet may be arranged between the substrate and a longitudinal center axis of the cavity. The aerogel layer or aerogel sheet may have a thickness of between 0.1 millimeter and 0.3 millimeter, preferably of about 0.2 millimeter. The aerogel layer or aerogel sheet may function as a thermal barrier. The aerogel layer or aerogel sheet may assist in thermally insulating the substrate from the heater assembly. The aerogel layer or aerogel sheet may assist in thermally insulating the substrate from the, during use, heated cavity. The housing of the aerosol-generating device may define the cavity. The housing of the aerosol-generating device defining the cavity may comprise a first portion of the housing defining the cavity. The first portion of the housing defining the cavity may be transparent to at least one wavelength of the electromagnetic radiation emitted by the emitter. The first portion of the housing may preferably be transparent to all of the wavelengths of the electromagnetic radiation emitted by the emitter. The emitter may be configured to emit the electromagnetic radiation into the cavity through the transparent portion. The first portion of the housing may separate the emitter from the cavity. Therefore, the first portion of the housing may protect the emitter from debris and dirt that may accumulate in the cavity. In particular, the emitter may be protected from residue from the aerosol-forming substrate that may accumulate during use of the aerosol-generating device. The first portion may be also advantageously be easy to clean such that the device can simply be maintained.
[0098] The shielding plate may comprise at least one clip. The shielding plate may comprise a first clip at the first planar portion and a second clip at the second planar portion. The first clip and the second clip may be configured to connect the shielding plate externally to the cavity.
[0099] The shielding plate may have a thickness of between 0.1 and 3 millimetres. The shielding plate may have a thickness of 0.2 millimetres. Such a thickness may advantageously be high enough to ensure that the shielding plate blocks ambient electromagnetic radiation sufficiently
[0100] The shielding plate further may comprise a protrusion. The protrusion may be arranged in-between the first planar portion and the second planar portion. The protrusion may be arranged between the sensor and the emitter. The protrusion may be configured to shield the sensor from direct electromagnetic radiation emitted by the emitter.
[0101] The shielding plate may comprise an electrically conductive material having an electrical conductivity of at least 1x106 Siemens per metre. The shielding plate may consist of an electrically conductive material having an electrical conductivity of at least 1x106 Siemens per metre. The shielding plate may consist of an electrically conductive material having an electrical conductivity of at least 1x107 Siemens per metre. The shielding plate may consist of an electrically conductive material having an electrical conductivity of at least 5x107 Siemens per metre.
[0102] The shielding plate may comprise a thermally conductive material having a thermal conductivity of at least 10 Watts per metre-Kelvin. The shielding plate may consist of a thermally conductive material having a thermal conductivity of at least 10 Watts per metre-Kelvin. The shielding plate may consist of a thermally conductive material having a thermal conductivity of at least 80 Watts per metre-Kelvin. The shielding plate may consist of a thermally conductive material having a thermal conductivity of at least 100 Watts per metre-Kelvin. The shielding plate may consist of a thermally conductive material having a thermal conductivity of at least 150 Watts per metre-Kelvin. The shielding plate may comprise at least one of aluminum and stainless steel. Preferably, the shielding plate is made of a phosphor bronze, preferably a nickel-plated Phosphor bronze. The shielding plate comprising or consisting of a thermally conductive material may be particularly advantageous when the aerosol-generating device further comprises a heater assembly configured to heat an aerosol-forming substrate received in the cavity in use. The shielding plate comprising or consisting of a thermally conductive material may advantageously dissipate heat generated by the heater assembly away from the sensor. The sensor may be particularly sensitive to heating and may be damaged by excessive heating. The shielding plate comprising the thermally conductive material may advantageously prevent the receiver from overheating during use of the aerosol-generating device. The shielding plate may be configured to prevent the receiver from exceeding 115 degrees Celsius during use of the aerosol-generating device.
[0103] The shielding plate may have a width of between 1 and 10 millimetres, more preferably between 2 and 4 millimetres, even more preferably about 3 millimetres. The shielding plate may have 20 a length of between 10 and 30 millimetres, more preferably between 15 and 25 millimetres, even more preferably about 22 millimetres.
[0104] The shielding plate may be integrally formed. The shielding plate may be a monolithic piece. The shielding plate may be 3D-printed. The shielding plate may be moulded. The shielding plate may comprise a metal.
[0105] The at least one shielding component may be a shading film. The shading film may be integrally formed. The shading film may be configured with a central hole. The central hole may be dimensioned as the cavity. The shading film may be arranged to sealingly surround the cavity. The sensing assembly may comprise the shielding plate and the shading film. The shading film may be arranged in a plane perpendicular to the shielding plate, preferably abutting the shielding plate. The shading film may be connected to the shielding plate. The shading film may be fixed adhesively to the shielding plate. The shading film may be fixed mechanically by any connection means to the shielding plate.
[0106] The shading film may comprise a polymeric material. The shading film may comprise polyethylene terephthalate.
[0107] The at least one shielding component may be a sealing element. The sealing element may be arranged in a gap, preferably sealing the gap. The sealing element may be arranged in a gap between the top housing and the cavity, preferably between the rib of the top housing and the cavity. The sealing element may absorb ambient electromagnetic radiation. Thereby, the sensing assembly may be shielded from ambient electromagnetic radiation.
[0108] The sealing element may comprise a polymer. The polymer may be one of an elastomer, thermoplastic or duroplast. The sealing element may be configured to seal any gap between the cavity and the top housing.
[0109] The sealing element may be arranged in the cavity. The sealing element may be arranged at a proximal opening of the cavity. The sealing element may surround the aerosol- generating article, when the aerosol-generating article may be received in the cavity. The sealing element may partially surround the aerosol-generating article, when the aerosol-generating article may be received in the cavity.
[0110] The sealing element may be circular, preferably ring-shaped. The sealing element may be square shaped. The sealing element may be triangular shaped. The sealing element may be an O-ring. The sealing element may have any shape suitable to seal the gap between the top housing and the cavity.
[0111] The aerosol-generating device may comprise several shielding components. The aerosol-generating device may comprise one or more of a shielding plate, a shading film or a sealing element. Combining several shielding components or types of shielding components may shield the aerosol-generating device from ambient electromagnetic radiation. Combining several shielding components or types of shielding components may shield the cavity from ambient electromagnetic radiation. Combining several shielding components or types of shielding components may shield the sensing assembly, particularly the sensor, from ambient electromagnetic radiation. This may prevent the sensor from being oversaturated by ambient electromagnetic radiation, thereby resulting in a reliable detection of the aerosol-generating article.
[0112] The aerosol-generating device may comprise at least one shielding component and the sensing assembly with at least one electronic sensor adjustment component. The sensing assembly may comprise one or more shielding components and one or more electronic sensor adjustment components. The use of both, at least one shielding component and at least one sensor adjustment component, can improve the reliable detection of aerosol-generating articles. The at least one shielding component may shield the sensor from a majority of the ambient electromagnetic radiation, whereas the at least one sensor adjustment component may adjust the sensor based on a minority of ambient electromagnetic radiation, which may not be shielded. When ambient electromagnetic radiation reaches a certain level of intensity, ambient electromagnetic radiation may pass shielding components. The sole use of an electronic sensor adjustment component may result in the sensor being oversaturated. However, combining one or more shielding components and at least one sensor adjustment component may result in a synergistic effect, wherein the inserted aerosol-generating article may be detected with an improved reliability.
[0113] According to an embodiment of the invention there may be provided a method for the detection of an aerosol-generating article. The method may comprise the step of activating the detection after the predetermined time after the start of a pre-heating phase of the aerosol-generating device.
[0114] According to an embodiment of the invention there is provided a method for the detection of an aerosol-generating article. The method comprises the step of activating the detection after the predetermined time after the start of a pre-heating phase of the aerosol-generating device.
[0115] The method may include that the predetermined time after the pre-heating phase may amount between 1 and 35 seconds, preferably between 7 and 28 seconds, more preferably between 14 and 21 seconds, most preferably about 17 seconds.
[0116] The method may include that the detection of the aerosol-generating article may be activated by a controller.
[0117] As used herein, the terms ‘proximal’ , ‘distal’ , ‘downstream’ and ‘upstream’ are used to describe the relative positions of components, or portions of components, of the aerosol-generating device and the aerosol-generating article in relation to the direction in which a user draws on the aerosol-generating device or aerosol-generating article during use thereof.
[0118] The controller may be configured to detect a type of the aerosol-generating article based on an article output. The article output may comprise article data.
[0119] The controller may be configured to analyze article data provided as the article output by the article sensor. The article data may be indicative of the type of the inserted aerosol-generating article. The article data may be indicative of parameters associated with the inserted aerosol-generating article.
[0120] The controller may comprise a memory. The memory may comprise pre-stored article data.
[0121] The controller may be configured to compare the article output with the pre-stored article data. The controller may be configured to correlate the article output with the pre-stored article data. The controller may be configured to detect and identify the type of the inserted aerosol-generating article by correlating the article output with the pre-stored article data. In this way the controller may be configured to identify the aerosol-generating article inserted into the cavity of the aerosol-generating device.
[0122] The controller may be configured to control operation of the aerosol-generating device depending upon an article output.
[0123] The invention may allow the provision of an optimized user experience by adapting aerosol generation to the type of article inserted in the device. By comparing the article output with pre-stored article data, the aerosol-generating device may identify the article type inserted in the device. In response, the device may adapt and thereby optimize aerosol generation. For example, a pre-stored type specific heating profile may be employed. The type specific heating profile may correspond to one or both of a type specific configuration of aerosol-forming substrate within the article and an article type.
[0124] The controller may comprise a microprocessor, which may be a programmable microprocessor. The controller may be configured to regulate a supply of power to a heating element of the aerosol-generating device. Power may be supplied to the heating element continuously following activation of the aerosol-generating device or may be supplied intermittently, such as on a puff-by-puff basis. The power may be supplied to the heating element in the form of pulses of electrical current. The controller may be configured to monitor the electrical resistance of the heating element, and preferably to control the supply of power to the heating element dependent on the electrical resistance of the heating element.
[0125] The controller may be configured to regulate power supply to the heating element based on the identification of a type of aerosol-generating article. Upon identification of a type of aerosol-generating article, the controller may allow power to be supplied to the heating element. Upon identification of a type of aerosol-generating article, the controller may allow the provision of a user experience. Upon identification of a type of aerosol-generating article, the controller may adjust the power supply in dependence on the article type identified. The controller may be configured to provide power to the heating element according to a predefined heating profile for the respective identified article.
[0126] The controller may adjust the magnitude of power supply in dependence on the article type identified. The controller may adjust the time period of power supply in dependence on the article type identified. The controller may adjust the temperature of the heating element in dependence on the article type identified. The controller may adjust one or more of the amplitude and the frequency of a current supplied to the heating element in dependence on the article type identified. The controller may adjust the signal powering the heating element in dependence on the article type identified.
[0127] The memory of the controller may comprise a database of pre-stored heating profiles for each known type of aerosol-generating article. The controller may be configured to provide power according to the heating profile of the identified type of aerosol-generating article. Power supply may be tailored to the configuration of a specific article type. Aerosol-generation and the user experience may be optimized.
[0128] The controller may be configured to determine a maximum heating time associated with the identified type of aerosol-generating article. In addition or alternatively, the controller may be configured to determine at least one of: a maximum number of puffs associated with the identified type of aerosol-generating article, and a maximum volume of aerosol associated with the identified type of aerosol-generating article.
[0129] The controller may be configured to prevent power supply to the heating element or to cease heating the aerosol-generating article after the maximum heating time has elapsed.
[0130] The memory may be configured to store a plurality of maximum heating times each corresponding to a particular type of aerosol-generating article.
[0131] The controller may be configured to prevent power supply to the heating element or to cease heating the aerosol-generating article after the maximum number of puffs or the maximum volume of aerosol has been reached.
[0132] The memory may be configured to store a plurality of maximum number of puffs each corresponding to a particular type of aerosol-generating article.
[0133] The memory may be configured to store a plurality of maximum volume of aerosol each corresponding to a particular type of aerosol-generating article.
[0134] By determining a maximum heating time, excessive use of an aerosol-generating article may be prevented. Excessive use of an aerosol-generating article may lead to unsatisfactory aerosol formation and to may affect the overall user experience. Setting a maximum heating time for a given aerosol-generating article may be implemented by using available controller functionalities.
[0135] Determining a maximum number of puffs may equally prevent excessive use of an aerosol-generating article. Consumption of the aerosol-forming substrate may largely depend on the number of puffs taken during a user experience. Thus, determining a maximum number of puffs may represent an alternative means for setting a limit of usage and for preventing excessive use of an aerosol-generating article.
[0136] Progress of consumption of the aerosol-forming substrate in an aerosol-forming article may specifically monitored by determining the volume of aerosol generated during a user experience. The volume of the generated aerosol may not only depend on the number of puffs, but also on user specific factors such as the intensity of the puffs taken. Monitoring the generated aerosol volume and limiting the usage of an aerosol-generating article based on a maximum volume may help to better take into account user specific usage behaviour.
[0137] The aerosol-generating device may be configured to be used with a plurality of different types of aerosol-generating articles.
[0138] The aerosol-generating device may comprise a mouth end through which in use an aerosol exits the aerosol-generating device and is delivered to a user. In use, a user draws on the proximal or mouth end of the aerosol-generating device in order to inhale an aerosol generated by the aerosol-generating device. Alternatively, a user may directly draw on an aerosol-generating article inserted into an opening at the proximal end of the aerosol-generating device. The opening at the proximal end may be an opening of the cavity. The aerosol-generating device comprises a distal end opposed to the proximal or mouth end. The proximal or mouth end of the aerosol-generating device may also be referred to as the downstream end and the distal end of the aerosol-generating device may also be referred to as the upstream end. Components, or portions of components, of the aerosol-generating device may be described as being upstream or downstream of one another based on their relative positions between the proximal, downstream or mouth end and the distal or upstream end of the aerosol-generating device.
[0139] As used herein, an ‘aerosol-generating device’ relates to a device that interacts with an aerosol-forming substrate to generate an aerosol. The aerosol-forming substrate may be part of an aerosol-generating article, for example part of a smoking article. An aerosol-generating device may be a smoking device that interacts with an aerosol-forming substrate of an aerosol-generating article to generate an aerosol that is directly inhalable into a user’s lungs thorough the user's mouth. An aerosol-generating device may be a holder. The device may be an electrically heated smoking device. The aerosol-generating device may comprise a housing, electric circuitry, a power supply, a heating chamber and a heating element.
[0140] As used herein with reference to the present invention, the term ‘smoking’ with reference to a device, article, system, substrate, or otherwise does not refer to conventional smoking in which an aerosol-forming substrate is fully or at least partially combusted. The aerosol-generating device of the present invention is arranged to heat the aerosol-forming substrate to a temperature below a combustion temperature of the aerosol-forming substrate, but at or above a temperature at which one or more volatile compounds of the aerosol-forming substrate are released to form an inhalable aerosol.
[0141] The aerosol-generating device may have a length of between 86 millimeters to 130 millimeters.
[0142] In any of the aspects of the disclosure, the heating element may comprise an electrically resistive material. Suitable electrically resistive materials include but are not limited to:semiconductors such as doped ceramics, electrically "conductive" ceramics (such as, for example, molybdenum disilicide) , carbon, graphite, metals, metal alloys and composite materials made of a ceramic material and a metallic material. Such composite materials may comprise doped or undoped ceramics. Examples of suitable doped ceramics include doped silicon carbides. Examples of suitable metals include titanium, zirconium, tantalum platinum, gold and silver. Examples of suitable metal alloys include stainless steel, nickel-, cobalt-, chromium-, aluminum-titanium-zirconium-, hafnium-, niobium-, molybdenum-, tantalum-, tungsten-, tin-, gallium-, manganese-, gold-and iron-containing alloys, and super-alloys based on nickel, iron, cobalt, stainless steel, and iron-manganese-aluminum based alloys. In composite materials, the electrically resistive material may optionally be embedded in, encapsulated or coated with an insulating material or vice-versa, depending on the kinetics of energy transfer and the external physicochemical properties required.
[0143] As described, in any of the aspects of the disclosure, the heating element may be part of an aerosol-generating device. The aerosol-generating device may comprise an internal heating element or an external heating element, or both internal and external heating elements, where "internal" and "external" refer to the aerosol-forming substrate. An internal heating element may take any suitable form. For example, an internal heating element may take the form of a heating blade. Alternatively, the internal heater may take the form of a casing or substrate having different electro-conductive portions, or an electrically resistive metallic tube. Alternatively, the internal heating element may be one or more heating needles or rods that run through the center of the aerosol-forming substrate. Other alternatives include a heating wire or filament, for example a Ni-Cr (Nickel-Chromium) , platinum, tungsten or alloy wire or a heating plate. Optionally, the internal heating element may be deposited in or on a rigid carrier material. In one such embodiment, the electrically resistive heating element may be formed using a metal having a defined relationship between temperature and resistivity. In such an exemplary device, the metal may be formed as a track on a suitable insulating material, such as ceramic material, and then sandwiched in another insulating material, such as a glass. Heaters formed in this manner may be used to both heat and monitor the temperature of the heating elements during operation.
[0144] An external heating element may take any suitable form. For example, an external heating element may take the form of one or more flexible heating foils on a dielectric substrate, such as polyimide. The flexible heating foils can be shaped to conform to the perimeter of the substrate receiving cavity. Alternatively, an external heating element may take the form of a metallic grid or grids, a flexible printed circuit board, a molded interconnect device (MID) , ceramic heater, flexible carbon fibre heater or may be formed using a coating technique, such as plasma vapour deposition, on a suitable shaped substrate. An external heating element may also be formed using a metal having a defined relationship between temperature and resistivity. In such an exemplary device, the metal may be formed as a track between two layers of suitable insulating materials. An external heating element formed in this manner may be used to both heat and monitor the temperature of the external heating element during operation.
[0145] As an alternative to an electrically resistive heating element, the heating element may be configured as an induction heating element. The induction heating element may comprise an induction coil and a susceptor. In general, a susceptor is a material that is capable of generating heat, when penetrated by an alternating magnetic field. When located in an alternating magnetic field. If the susceptor is conductive, then typically eddy currents are induced by the alternating magnetic field. If the susceptor is magnetic, then typically another effect that contributes to the heating is commonly referred to hysteresis losses. Hysteresis losses occur mainly due to the movement of the magnetic domain blocks within the susceptor, because the magnetic orientation of these will align with the magnetic induction field, which alternates. Another effect contributing to the hysteresis loss is when the magnetic domains will grow or shrink within the susceptor. Commonly all these changes in the susceptor that happen on a nano-scale or below are referred to as “hysteresis losses” , because they produce heat in the susceptor. Hence, if the susceptor is both magnetic and electrically conductive, both hysteresis losses and the generation of eddy currents will contribute to the heating of the susceptor. If the susceptor is magnetic, but not conductive, then hysteresis losses will be the only means by which the susceptor will heat, when penetrated by an alternating magnetic field. The susceptor may be electrically conductive or magnetic or both electrically conductive and magnetic. An alternating magnetic field generated by one or several induction coils heat the susceptor, which then transfers the heat to the aerosol-forming substrate, such that an aerosol is formed. The heat transfer may be mainly by conduction of heat. Such a transfer of heat is best, if the susceptor is in close thermal contact with the aerosol-forming substrate.
[0146] The aerosol-generating device may comprise a power supply, typically a battery, within a main body of the aerosol-generating device. In one embodiment, the power supply is a Lithium-ion battery. Alternatively, the power supply may be a Nickel-metal hydride battery, a Nickel cadmium battery, or a Lithium based battery, for example a Lithium-Cobalt, a Lithium-Iron-Phosphate, Lithium Titanate or a Lithium-Polymer battery. As an alternative, the power supply may be another form of charge storage device such as a capacitor. The power supply may require recharging and may have a capacity that enables to store enough energy for one or more usage experiences; for example, the power supply may have sufficient capacity to continuously generate aerosol for a period of around six minutes or for a period of a multiple of six minutes. In another example, the power supply may have sufficient capacity to provide the predetermined number of puffs or discrete activations of the heating element.
[0147] Alternatively, the aerosol-forming substrate may be contained in an aerosol-generating article. In that case, the electromagnetic radiation received by the sensor may be affected by the chemical structure of the aerosol-generating article, for example a wrapper or housing of the article. Different aerosol-generating articles may comprise different chemical structures, for example different wrappers or housings. This may allow for different aerosol-generating articles to be identified.
[0148] “Different aerosol-generating article” may refer to aerosol-generating articles comprising different aerosol-forming substrates. Furthermore, a portion of the electromagnetic radiation may pass through the aerosol-generating device to the aerosol-forming substrate such that electromagnetic radiation received by the sensor may have been affected by the chemical structure of both the aerosol-generating article and substrate.
[0149] The aerosol-forming substrate may be a solid aerosol-forming substrate. Alternatively, the aerosol-forming substrate may comprise both solid and liquid components. The aerosol-forming substrate may comprise a tobacco-containing material containing volatile tobacco flavour compounds which are released from the substrate upon heating. Alternatively, the aerosol-forming substrate may comprise a non-tobacco material. The aerosol-forming substrate may further comprise an aerosol former that facilitates the formation of a dense and stable aerosol. Examples of suitable aerosol formers are glycerine and propylene glycol.
[0150] If the aerosol-forming substrate is a solid aerosol-forming substrate, the solid aerosol-forming substrate may comprise, for example, one or more of: powder, granules, pellets, shreds, spaghettis, strips or sheets containing one or more of: herb leaf, tobacco leaf, fragments of tobacco ribs, reconstituted tobacco, homogenised tobacco, extruded tobacco, cast leaf tobacco and expanded tobacco. The solid aerosol-forming substrate may be in loose form, or may be provided in a suitable container or cartridge. Optionally, the solid aerosol-forming substrate may contain additional tobacco or non-tobacco volatile flavour compounds, to be released upon heating of the substrate. The solid aerosol-forming substrate may also contain capsules that, for example, include the additional tobacco or non-tobacco volatile flavour compounds and such capsules may melt during heating of the solid aerosol-forming substrate.
[0151] As used herein, homogenised tobacco refers to material formed by agglomerating particulate tobacco. Homogenised tobacco may be in the form of a sheet. Homogenised tobacco material may have an aerosol-former content of greater than 5%on a dry weight basis. Homogenised tobacco material may alternatively have an aerosol former content of between 5%and 30%by weight on a dry weight basis. Sheets of homogenised tobacco material may be formed by agglomerating particulate tobacco obtained by grinding or otherwise combining one or both of tobacco leaf lamina and tobacco leaf stems. Alternatively, or in addition, sheets of homogenised tobacco material may comprise one or more of tobacco dust, tobacco fines and other particulate tobacco by-products formed during, for example, the treating, handling and shipping of tobacco. Sheets of homogenised tobacco material may comprise one or more intrinsic binders, that is tobacco endogenous binders, one or more extrinsic binders, that is tobacco exogenous binders, or a combination thereof to help agglomerate the particulate tobacco; alternatively, or in addition, sheets of homogenised tobacco material may comprise other additives including, but not limited to, tobacco and non-tobacco fibres, aerosol-formers, humectants, plasticisers, flavourants, fillers, aqueous and non-aqueous solvents and combinations thereof.
[0152] Optionally, the solid aerosol-forming substrate may be provided on or embedded in a thermally stable carrier. The carrier may take the form of powder, granules, pellets, shreds, spaghettis, strips or sheets. Alternatively, the carrier may be a tubular carrier having a thin layer of the solid substrate deposited on its inner surface, or on its outer surface, or on both its inner and outer surfaces. Such a tubular carrier may be formed of, for example, a paper, or paper like material, a non-woven carbon fibre mat, a low mass open mesh metallic screen, or a perforated metallic foil or any other thermally stable polymer matrix.
[0153] In a particularly preferred embodiment, the aerosol-forming substrate comprises a gathered crimpled sheet of homogenised tobacco material. As used herein, the term ‘crimped sheet’ denotes a sheet having a plurality of substantially parallel ridges or corrugations. Preferably, when the aerosol-generating article has been assembled, the substantially parallel ridges or corrugations extend along or parallel to the longitudinal axis of the aerosol-generating article. This advantageously facilitates gathering of the crimped sheet of homogenised tobacco material to form the aerosol-forming substrate. However, it will be appreciated that crimped sheets of homogenised tobacco material for inclusion in the aerosol-generating article may alternatively or in addition have a plurality of substantially parallel ridges or corrugations that are disposed at an acute or obtuse angle to the longitudinal axis of the aerosol-generating article when the aerosol-generating article has been assembled. In certain embodiments, the aerosol-forming substrate may comprise a gathered sheet of homogenised tobacco material that is substantially evenly textured over substantially its entire surface. For example, the aerosol-forming substrate may comprise a gathered crimped sheet of homogenised tobacco material comprising a plurality of substantially parallel ridges or corrugations that are substantially evenly spaced-apart across the width of the sheet.
[0154] The solid aerosol-forming substrate may be deposited on the surface of the carrier in the form of, for example, a sheet, foam, gel or slurry. The solid aerosol-forming substrate may be deposited on the entire surface of the carrier, or alternatively, may be deposited in a pattern in order to provide a non-uniform flavour delivery during use.
[0155] Below, there is provided a non-exhaustive list of non-limiting examples. Any one or more of the features of these examples may be combined with any one or more features of another example, embodiment, or aspect described herein.
[0156] Example 1. An aerosol-generating device for generating aerosol from an aerosol-forming article, the aerosol-generating device comprising:
[0157] a sensing assembly comprising
[0158] an emitter configured to emit electromagnetic radiation of a predetermined spectrum,
[0159] a sensor configured to detect the electromagnetic radiation of the predetermined spectrum and ambient electromagnetic radiation, and
[0160] at least one electronic sensor adjustment component configured to adjust the sensor based on the detected ambient electromagnetic radiation.
[0161] Example 2. The aerosol-generating device according to example 1, wherein the sensor is configured to detect an intensity of the ambient electromagnetic radiation.
[0162] Example 3. The aerosol-generating device according to example 2, wherein the electronic sensor adjustment component adjusts the sensor based on the detected intensity of the ambient electromagnetic radiation.
[0163] Example 4. The aerosol-generating device according to any of the preceding examples, wherein the aerosol-generating device comprises a cavity configured to receive the aerosol-generating article.
[0164] Example 5. The aerosol-generating device according to any of the preceding examples, wherein the aerosol-generating device comprises a controller configured to determine the aerosol-generating article based on the detected electromagnetic radiation of the predetermined spectrum.
[0165] Example 6. The aerosol-generating device according to any of the preceding examples, wherein the controller is configured to receive the intensity of the detected ambient electromagnetic radiation as one of a current or voltage.
[0166] Example 7. The aerosol-generating device according to any of the preceding examples, wherein the at least one electronic sensor adjustment component is an operational amplifier, preferably a gain-selectable amplifier, configured to adjust the gain of the sensor’s detection.
[0167] Example 8. The aerosol-generating device according to any of the preceding examples, wherein the controller is configured to adjust the gain-selectable amplifier to low gain or to high gain, based on the intensity of the detected ambient electromagnetic radiation.
[0168] Example 9. The aerosol-generating device according to any of the preceding examples, wherein the controller is configured to adjust the gain-selectable amplifier to low gain, when the intensity of the detected ambient electromagnetic radiation exceeds a certain threshold, preferably 500 W / m2.
[0169] Example 10. The aerosol-generating device according to any of the preceding examples, wherein the controller is configured to adjust the gain-selectable amplifier to high gain, when the intensity of the detected ambient electromagnetic radiation falls below the certain threshold, preferably 500 W / m2.
[0170] Example 11. The aerosol-generating device according to any of the preceding examples, wherein the controller is configured to determine the aerosol-generating article after adjusting the gain-selectable amplifier.
[0171] Example 12. The aerosol-generating device according to any of examples 1 to 6, wherein the at least one electronic sensor adjustment component is an electronic filter, preferably a passive electronic filter.
[0172] Example 13. The aerosol-generating device according to example 12, wherein the sensor produces a sensor output based on the detected electromagnetic radiation of the predetermined spectrum and / or on the ambient electromagnetic radiation.
[0173] Example 14. The aerosol-generating device according to example 13, wherein the passive electronic filter is applied to the sensor output.
[0174] Example 15. The aerosol-generating device according to example 14, wherein the sensor output includes an article output based on the detected electromagnetic radiation of the predetermined spectrum and an ambient output based on the detected ambient electromagnetic radiation.
[0175] Example 16. The aerosol-generating device according to any of examples 15, wherein the passive electronic filter is configured to prevent the ambient output from passing through to the controller.
[0176] Example 17. The aerosol-generating device according to example 16, wherein the passive electronic filter is configured to let the article output pass through.
[0177] Example 18. The aerosol-generating device according to example 17, wherein the passive electronic filter is one of a high-pass filter, low-pass filter or a bandpass filter.
[0178] Example 19. A method for determination of an aerosol-generating article with an aerosol-generating device, comprising the steps of:
[0179] emitting electromagnetic radiation of a predetermined spectrum with an emitter,
[0180] detecting an intensity of ambient electromagnetic radiation with a sensor,
[0181] adjusting the sensor based on the detected intensity of the ambient electromagnetic radiation, and
[0182] detecting the electromagnetic radiation of a predetermined spectrum with the adjusted sensor, and
[0183] determining the aerosol-generating article with a controller based on the detected electromagnetic radiation of a predetermined spectrum.
[0184] Example 20. The method of example 19, wherein the sensor is configured to measure at least one wavelength of the detected ambient electromagnetic radiation, preferably an intensity of the at least one wavelength of the detected ambient electromagnetic radiation.
[0185] Example 21. The method of any of examples 19 and 20, wherein the at least one electronic sensor adjustment component is a gain-selectable amplifier adjustable by the controller.
[0186] Example 22. The method of any of examples 19 to 21, wherein the controller adjusts the gain-selectable amplifier to low gain, when the sensor measures an intensity of the detected ambient electromagnetic radiation exceeding a certain threshold, preferably 500 W / m2.
[0187] Example 23. The method of any of examples 19 to 22, wherein the controller adjusts the gain-selectable amplifier to high gain, when the sensor measures an intensity of ambient electromagnetic radiation falling below the certain threshold, preferably 500 W / m2.
[0188] Example 24. An aerosol-generating system comprising the aerosol-generating device according to any of the preceding examples and an aerosol-generating article.
[0189] Example 25. The aerosol-generating system according to example 24, wherein the ambient electromagnetic radiation of the predetermined spectrum is reflected on the aerosol- generating article, preferably a taggant signature, when the aerosol-generating article is received in the cavity.
[0190] Example 26. An aerosol-generating device for generating aerosol from an aerosol-forming article, the aerosol-generating device comprising:
[0191] a housing defining a cavity for at least partially receiving the aerosol-forming article;
[0192] a sensing assembly comprising:
[0193] an emitter configured to emit electromagnetic radiation into the cavity, and
[0194] a sensor configured to detect electromagnetic radiation; and
[0195] at least one shielding component configured to partially, preferably completely, shield the sensor from ambient electromagnetic radiation.
[0196] Example 27. The aerosol-generating device according to example 26, wherein the at least one shielding component is configured to absorb ambient light.
[0197] Example 28. The aerosol-generating device according to example any of examples 26 and 27, wherein the at least one shielding component has a dark colour, preferably black.
[0198] Example 29. The aerosol-generating device according to any of examples 26 to 28, wherein the shielding component is a shielding plate being positioned externally to the cavity such that the sensor is arranged between the cavity and at least a portion of the shielding plate, preferably, wherein the sensor is arranged between a longitudinal center axis of the cavity and at least a portion of the shielding plate.
[0199] Example 30. The aerosol-generating device according to any of examples 26 to 29, wherein the shielding plate is configured to cover a major part of the sensor external from the cavity, preferably wherein the shielding plate covers the entire sensor external from the cavity, and wherein the shielding plate is configured to shield the sensor from ambient electromagnetic radiation coming from more than one direction, preferably from all directions.
[0200] Example 31. The aerosol-generating device according to any of examples 26 to 30, wherein the shielding plate comprises a first planar portion and a second planar portion, preferably wherein the first planar portion and the second planar portion are connected to each other, more preferably, via a junction edge.
[0201] Example 32. The aerosol-generating device according to any of examples 26 to 31, wherein the first planar portion and the second planar portion are non-co-planar and are lying in a plane parallel or along a longitudinal central axis of the aerosol-generating device.
[0202] Example 33. The aerosol-generating device according to any of examples 26 to 32, wherein the sensor is positioned between the first planar portion of the shielding plate and the cavity and the emitter is positioned between the second planar portion of the shielding plate and the cavity.
[0203] Example 34. The aerosol-generating device according to any of examples 26 to 33, wherein the shielding plate comprises a third planar portion, and wherein the third planar portion is arranged perpendicular to the longitudinal axis of the cavity, preferably, wherein the third planar portion is connected to the first planar portion and the second planar portion.
[0204] Example 35. The aerosol-generating device according to any of examples 26 to 34, wherein the shielding plate comprises at least one clip, preferably wherein the shielding plate comprises a first clip at the first planar portion and a second clip at the second planar portion, more preferably, wherein the first clip and the second clip are configured to connect the shielding plate externally to the cavity.
[0205] Example 36. The aerosol-generating device according to any of examples 26 to 35, wherein the shielding plate is integrally formed, preferably wherein the shielding plate is a monolithic piece.
[0206] Example 37. The aerosol-generating device according to any of examples 26 to 36, wherein the shielding plate further comprises a protrusion, preferably in-between the first planar portion and the second planar portion, more preferably between the sensor and the emitter, configured to shield the sensor from direct electromagnetic radiation emitted by the emitter.
[0207] Example 38. The aerosol-generating device according to any of to any of examples 26 to 37, wherein the shielding plate comprises, preferably consist of, an electrically conductive material having an electrical conductivity of at least 1x106 Siemens per metre.
[0208] Example 39. The aerosol-generating device according to any of to any of examples 26 to 38, wherein the shielding plate comprises, preferably consist of, a thermally conductive material having a thermal conductivity of at least 10 Watts per metre-Kelvin.
[0209] Example 40. The aerosol-generating device according to any of examples 26 to 28, wherein the at least one shielding component is a shading film.
[0210] Example 41. The aerosol-generating device according to example 40, wherein the shading film comprises a polymeric material, preferably polyethylene terephthalate.
[0211] Example 42. The aerosol-generating device according to example 41, wherein the at least one shielding component is an O-ring.
[0212] Example 43. The aerosol-generating device according to example 42, wherein the O-ring is arranged in the cavity, preferably at a proximal opening of the cavity.
[0213] Example 44. The aerosol-generating device according to example 43, wherein the O-ring surrounds the aerosol-generating article, when the aerosol-generating article is received in the cavity.
[0214] Example 45. The aerosol-generating device according to any of examples 26 to 44, wherein the aerosol-generating device comprises several shielding components, preferably one or more of a shielding plate, a shading film or an O-ring.
[0215] Example 46. The aerosol-generating device according to any of examples 26 to 45, Wherein the sensing assembly comprises at least one electronic sensor adjustment component according to any of examples 1 to 18.
[0216] Example 47. A method according to any of examples 19 to 23 for determination of an aerosol-generating article with an aerosol-generating device according to any of examples 1 to 19 and 25 to 38, wherein the detection of the aerosol-generating article is activated a predetermined time after the start of a pre-heating phase of the aerosol-generating device.
[0217] Example 48. The method of example 47, wherein the predetermined time after the pre-heating phase amounts between 1 and 35 seconds, preferably between 7 and 28 seconds, more preferably between 14 and 21 seconds, most preferably about 17 seconds.
[0218] Example 49. The method of any of examples 47 and 48, wherein the detection of the aerosol-generating article is activated by a controller.
[0219] Features described in relation to one embodiment may equally be applied to other embodiments of the invention.
[0220] The invention will be further described, by way of example only, with reference to the accompanying drawings in which:
[0221] Fig. 1 shows an aerosol-generating system;
[0222] Fig. 2 shows a sensing assembly;
[0223] Fig. 3a and 3b show a schematic representation of a sensor adjustment component;
[0224] Fig. 4a shows a sensing assembly with a shielding component;
[0225] Fig. 4b shows a shielding component;
[0226] Fig. 5a and 5b show a shielding component; and
[0227] Fig. 6a and 6b show a shielding component.
[0228] Fig. 1 shows an aerosol-generating system 10 in cross-sectional view. The aerosol-generating system 10 comprises an aerosol-generating article 12. The aerosol-generating article 12 comprises an aerosol-forming substrate 14 at a distal part thereof. The aerosol-generating system 10 further comprises an aerosol-generating device 16. The aerosol-generating device 16 comprises a cavity 18 for receiving the aerosol-forming substrate 14. The cavity 18 is defined by a housing 20 of the aerosol-generating device 16. In the configuration shown in Fig. 1, a distal part of the aerosol-generating article 12 comprising the aerosol-forming substrate 14 has been inserted into the cavity 18.
[0229] The aerosol-forming substrate 14 may be a solid tobacco-containing substrate. As shown in Fig. 1, the aerosol-generating article 12 and cavity 18 are configured such that a mouth end of the aerosol-generating article 12 protrudes out of the cavity 18 and out of the aerosol-generating device 16 when the aerosol-generating article 12 is received in the cavity 18. This mouth end forms a mouthpiece 22 on which a user of the aerosol-generating device 16 may puff in use. The aerosol-generating device 16 comprises a heater assembly comprising a heating element 24. The heating element 24 surrounds the cavity 18 along a portion of the cavity 18, in which the aerosol-forming substrate 14 of the aerosol-generating article 12 is received.
[0230] In an alternative embodiment, the heating element 24 may form a portion of the housing 20 that defines the part of the cavity 18 that receives the aerosol-forming substrate 14. The heating element 24 may be a resistive heating element.
[0231] An airflow channel 26 extends from an air inlet 28 of the aerosol-generating device 16. Upstream of the cavity 18, the airflow channel 26 is primarily defined by an airflow channel wall 30. Downstream of the airflow channel wall 30, the airflow channel 26 passes through an air inlet 32 defined in the base 34 of the cavity 18. The airflow channel 26 then extends through the cavity 18. When an aerosol-generating article 12 is received in the cavity 18, the airflow channel 26 passes through the aerosol-generating article 12 and extends through the mouthpiece 16.
[0232] The aerosol-generating device 16 further comprises a power supply 36 in form of a rechargeable battery for powering the heating element 24 controllable by a controller 38. The power supply 36 is connected to the controller 38 and the heating element 24 via electrical wires and connections that are not shown in the Figures.
[0233] The aerosol-generating device 16 may comprise further elements, not shown in the Figures, such as a button for activating the aerosol-generating device 16.
[0234] The aerosol-generating device 16 further comprises a sensing assembly 40 for detecting the aerosol-forming substrate 14 in the cavity 18. The sensing assembly 40 is configured to detect the aerosol-generating article 12 upon insertion of the aerosol-generating article 12 into the cavity. Upon detection of electromagnetic radiation, the sensing assembly 40 produces a signal output. The controller 38 receives the sensor output and identifies based on the sensor output, if the aerosol-generating article is inserted. The controller 38 further identifies the aerosol-generating article 12. The sensing assembly 40 comprises a sensor adjustment component not depicted in the Figures, which adjusts the detection of the sensor based on detected ambient electromagnetic radiation.
[0235] Fig. 2 more clearly shows the sensing assembly 40. Fig. 2 is a perspective view of the sensing assembly 40 with a cut away portion of the aerosol-generating device 16. The sensing assembly 40 comprises an emitter 42. The emitter 42 comprises a plurality of LEDs. Each of the LEDs is configured to emit a different wavelength of electromagnetic radiation. The emitter 42, and in particular the plurality of LEDs of the emitter 42, is configured to emit the electromagnetic radiation into the cavity 18. The emitter 42 is configured to emit electromagnetic radiation having wavelengths of between 1350 and 1400 nanometers.
[0236] As shown in Fig. 1, the housing 20 that defines the part of the cavity 18 comprises a first transparent portion 44. The emitter 42 is separated from the cavity 18 by the first transparent portion 44 and is configured to emit electromagnetic radiation into the cavity 18 through the first transparent portion 44. The provision of the first transparent portion 44 protects the emitter 42 from debris and dirt that can accumulate in the cavity 18 after prolonged use of the device 16 and can be easily cleaned.
[0237] As shown in Fig. 2, the sensing assembly 40 further comprises a sensor 46. The sensor 46 is configured to receive electromagnetic radiation from the cavity 18. In particular, the sensor 46 is configured to receive electromagnetic radiation from the cavity 18 that was emitted by the emitter 42 and then reflected or transmitted by the aerosol-generating article 12 towards the sensor 46. The sensor 46 comprises a photodiode. The sensor 46 is configured to measure a plurality of wavelengths of the received electromagnetic radiation. In particular, the sensor 46 is configured to measure the intensity of the plurality of wavelengths of received electromagnetic radiation. The sensor 46 is configured to receive electromagnetic radiation having wavelengths of between 1350 and 1400 nanometers.
[0238] The cavity 18 comprises a second transparent portion, not shown in the Figures. The sensor 46 is separated from the cavity 18 by the second transparent portion and is configured to receive electromagnetic radiation from the cavity 18 through the second transparent portion.
[0239] The sensing assembly 40 further comprises a substrate in the form of a printed circuit board (PCB) 48. A first substrate portion 50 of the PCB 48 comprises the emitter 42. A second substrate portion 52 of the PCB 48 comprises the sensor 46. Both the first and second substrate portions 50, 52 of the PCB 48 are planar. The PCB 48 further comprises a third substrate portion 54 which is flexible.
[0240] As is shown most clearly in Figs. 2 and 4, the third substrate portion 54 has been bent such that the angle between the first substrate portion 50 and the second substrate portion 52 is 100 degrees. Thus, the angle between the normal to the first substrate portion 50 and the normal to the second substrate portion 52 is 80 degrees. This also means that the angle between the central optical axis of the emitter 42 and the central optical axis of the sensor 46 is 80 degrees. This provides the optimum optical performance.
[0241] Fig. 3a and Fig. 3b show schematic representations of functioning mechanisms of the sensor adjustment components. Fig. 3a shows a schematic representation of a gain-selectable amplifier 58. After starting the aerosol-generating device 16 (not shown) , only the sensor 46 and the gain-selectable amplifier 58 are activated by the controller 38. Thus, the sensor 46 detects only ambient electromagnetic radiation in step A. The sensor 46 produces an ambient output based on the detected ambient electromagnetic radiation. The ambient output contains information about the ambient electromagnetic radiation such as the intensity of the ambient electromagnetic radiation. The gain-selectable amplifier 58 receives the signal output in step B. The gain-selectable amplifier 58 is set by default to high gain. The gain-selectable amplifier 58 forwards in step C signal output to the controller 38. Based on the signal output, the controller 38 identifies the intensity of the detected ambient electromagnetic radiation and compares the intensity to a threshold of 500 W / m2. If the detected ambient electromagnetic radiation has an intensity exceeding 500 W / m2, the controller 38 adjusts the gain-selectable amplifier 58 in step D to low gain and activates the emitter 42 (not shown) . If the detected ambient electromagnet radiation has an intensity of below 500 W / m2, step D is skipped and the controller 38 activates the emitter 42 directly. After activation of the emitter 42, the sensor 46 detects in step E both the ambient electromagnetic radiation and electromagnetic radiation of the predetermined spectrum. Based on the detected electromagnetic radiation, the sensor 46 produces a signal output. The signal output may include the ambient output and additionally an article output. The article output contains information about the detected electromagnetic radiation of the predetermined spectrum. The signal output is received by the gain-selectable amplifier in step F and forwarded to the controller in step G. When the aerosol-generating article is received in the aerosol-generating device, the article output contains information about the aerosol-generating article. Thus, the controller 38 can identify the aerosol-generating article after step G based on the article output.
[0242] Fig. 3b shows a schematic representation of using an alternative sensor 46 adjustment component. In this particular embodiment, the electronic sensor adjustment component is a passive electronic filter 60. Ambient electromagnetic radiation and electromagnetic radiation of the predetermined spectrum emitted by the emitter 42 (not shown) are detected by the sensor 46 in step H. The sensor 46 produces a signal output, which may include the ambient output and the article output. In step I, the passive electronic filter 60 receives the signal output. The passive electronic filter 60 may be one of a high-pass-, low-pass-or bandpass filter. The passive electronic filter 60 blocks the ambient output from passing through or reduces the ambient output. The passive electronic filter 60 is further configured to allow the article output passing through. In step J, the controller 38 receives the article output. Due to the filtered signal output, the controller 38 is able to identify the aerosol-generating article 12 based on the article output, without the ambient output interfering.
[0243] Fig. 4a shows another cut away perspective view of a section of the aerosol-generating device 16 including the sensing assembly 40 (but looking towards the cavity 18 from approximately the opposite direction in comparison to Fig. 2) . Fig. 4a shows several parts of the sensing assembly 40 in an exploded-view, namely the shielding plate 62, the PCB 48, and an aerogel 64. In an assembled configuration, these components are attached on top of one another. The shielding plate 62 is configured to block electromagnetic radiation and is positioned externally to the cavity 18 such that the sensor 46 is arranged between the cavity 18 and at least a portion of the shielding plate 62. In the embodiment shown, both the sensor 46 and the emitter 42 are positioned between the shielding plate 62 and the cavity 18. In this way, electromagnetic radiation that is external to the cavity 18 and sensing assembly 40 is blocked from reaching the emitter 42 and, more importantly, the sensor 46. This means that the amount of ambient electromagnetic radiation received at the sensor 46 is substantially reduced or eliminated and so is not detected as noise at the sensor 46. The shielding plate 62 is rigid enough that it is able to maintain and hold the first substrate portion 50 of the PCB 48 relative to the second substrate portion 52 such that the angle between the normal to the first substrate portion 50 and the normal to the second substrate portion 52 is 80 degrees.
[0244] The shielding plate 62 comprises a first planar portion 66 and a second planar portion 68. The first planar portion 66 and the second planar portion 68 are arranged in parallel to a longitudinal center axis 76 of the cavity 18. The first planar portion 66 and the second planar portion 68 are connected to each other via a U-section. The U-section comprises a bottom wall 70 and parallelly arranged first and second side walls 72, 74, which are arranged in parallel to a longitudinal center axis 76 of the cavity 18. The shielding plate 62 may be made of aluminum which is electrically conductive and so reflects or absorbs the ambient electromagnetic radiation. Aluminum is also a thermally conductive material. The shielding plate 62 being made of a thermally conductive material means that the shielding plate 62 is suitable for dissipating heat away from the sensor 46 and the emitter 42. As can be seen in Fig. 1, the sensing assembly 40 is positioned relatively close to the heating element 26. Thus, during use of the aerosol-generating device 20 when current is passing through the heating element 26 such that it heats up, heat will inevitably be transferred from the heating element 26 to the sensing assembly 40. The emitter 42 and sensor 46 can be damaged when they are overheated. The shielding plate 62 dissipating heat away from the emitter 42 and sensor 46 reduces the risk of the emitter 42 and sensor 46 being damaged. The shielding plate 62 comprises a first clip and a second clip. The first clip 78 is connected to the first planar portion 66. The second clip 80 is connected to the second planar portion 68. The shielding plate 62 is connected to the aerosol-generating device 16 via the first and second clips 78, 80.
[0245] Fig. 4b shows an alternative configuration of the shielding plate 62, wherein the shielding plate 62 comprises a third planar portion 82. The third planar portion 82 is arranged in a plane perpendicular to the first planar portion 66 and the second planar portion 68 (not visible in Fig. 4b, due to the shielding plate 62 being assembled to the PCB 48) . The third planar portion 82 is connected to the first planar portion 66 and the second planar portion 68. In this particular embodiment, the third planar portion 82 is connected to a top edge of the first and second planar portion 66, 68. Such a configuration may shield the sensing assembly 40 and in particular the sensor 46 (both not depicted in Fig. 4b) from ambient electromagnetic radiation, such as light.
[0246] Fig. 5a and Fig. 5b show an alternative variation of the shielding plate 62, wherein the shielding plate 62 comprises a heat dissipation component 84. Fig. 5a is a bird's eye view of the shielding plate 62 with a heat dissipation component 84 assembled in the aerosol-generating device 16. The heat dissipation component 84 in this particular embodiment is configured as a double hook, which is integral with the shielding plate 62.
[0247] Fig. 5b shows a close-up perspective of the heat dissipation component 84. The heat dissipation component 84 comprises a first surface 86 facing in a direction opposite of the cavity 18. A second surface 88 of the heat dissipation component 84 is facing the shielding plate 62, moreover in the direction of the cavity 18 (not depicted in Fig. 5a and Fig. 5b) . The first surface 86 of the heat dissipation component 84 is contacting the housing (not depicted in Fig. 5a and Fig. 5b) . As in the embodiment of Fig. 4a, the shielding plate 62 of Fig. 5a and Fig. 5b is configured to dissipate heat away from the sensor 46. The shielding plate 62 of Fig. 5a and 5b may further dissipate the heat, via the heat dissipation component 84, to the housing. The housing may preferably comprise a thermally conductive material such as aluminium. Thereby, the housing may act as a big heat sink.
[0248] Fig. 6a and Fig. 6b show two further variations of shielding components. Fig. 6a shows a top view of the aerosol-generating device 16, wherein the plate 62 is assembled to the aerosol-generating device 16. Fig. 6a shows a further shielding component in the form of a shading film 90. The shading film 90 is arranged surrounding the cavity. The shading film 90 covers a top edge of the shielding plate 62 and the sensing assembly 40. The shading film 90 comprises polyethylene terephthalate (PET) . The shading film 90 is an alternative to the third planar portion 82 of the shielding plate 62 in Fig. 4b. Due to its arrangement, the shading film 90 shields the sensing assembly 40 from ambient electromagnetic radiation via absorption. The shading film 90 is preferably black to improve absorption of ambient electromagnetic radiation.
[0249] Fig. 6b shows a side top view of an aerosol-generating device 16. The aerosol-generating device 16 comprises in this embodiment a top housing 92, which is connected to a proximal end of the cavity 18 via a rib 94. The aerosol-generating device 16 further comprises a sealing element in the shape of an O-ring 96. The O-ring 96 seals a gap between the top housing 92 and the cavity 18 of the aerosol-generating device 16. The O-ring 96 is configured to shield the cavity 18 –and indirectly the sensing assembly 40 (not depicted in Fig. 6b) –from ambient electromagnetic radiation via absorption. The O-ring 96 is preferably black to improve absorption.
Claims
1.An aerosol-generating device for generating aerosol from an aerosol-forming article, the aerosol-generating device comprising:a sensing assembly comprisingan emitter configured to emit electromagnetic radiation of a predetermined spectrum,a sensor configured to detect the electromagnetic radiation of the predetermined spectrum and ambient electromagnetic radiation, andat least one electronic sensor adjustment component configured to adjust the sensor based on the detected ambient electromagnetic radiation.2.The aerosol-generating device according to claim 1, wherein the sensor is configured to detect an intensity of the ambient electromagnetic radiation, preferably wherein the electronic sensor adjustment component adjusts the sensor based on the detected intensity of the ambient electromagnetic radiation.3.The aerosol-generating device according to any of the preceding claims, wherein the aerosol-generating device comprises a cavity configured to receive the aerosol-generating article.4.The aerosol-generating device according to any of the preceding claims, wherein the aerosol-generating device comprises a controller configured to determine the aerosol-generating article based on the detected electromagnetic radiation of the predetermined spectrum.5.The aerosol-generating device according to any of the preceding claims, wherein the controller is configured to receive the intensity of the detected ambient electromagnetic radiation as one of a current or voltage.6.The aerosol-generating device according to any of the preceding claims, wherein the at least one electronic sensor adjustment component is an operational amplifier, preferably a gain-selectable amplifier, configured to adjust the gain of the sensor’s detection.7.The aerosol-generating device according to any of the preceding claims, wherein the controller is configured to adjust the gain-selectable amplifier to low gain or to high gain, based on the intensity of the detected ambient electromagnetic radiation.8.The aerosol-generating device according to any of the preceding claims, wherein the controller is configured to adjust the gain-selectable amplifier to low gain, when the intensity of the detected ambient electromagnetic radiation exceeds a certain threshold, preferably 500 W / m2.9.The aerosol-generating device according to any of the preceding claims, wherein the controller is configured to adjust the gain-selectable amplifier to high gain, when the intensity of the detected ambient electromagnetic radiation falls below the certain threshold, preferably 500 W / m2.10.The aerosol-generating device according to any of claims 1 to 5, wherein the at least one electronic sensor adjustment component is an electronic filter, preferably a passive electronic filter.11.The aerosol-generating device according to claim 10, wherein the sensor produces a sensor output based on the detected electromagnetic radiation of the predetermined spectrum and / or on the ambient electromagnetic radiation, preferably wherein the passive electronic filter is applied to the sensor output.12.The aerosol-generating device according to any of claims 10 and 11, wherein the sensor output includes an article output based on the detected electromagnetic radiation of the predetermined spectrum and an ambient output based on the detected ambient electromagnetic radiation.13.The aerosol-generating device according to any of claims 10 to 12, wherein the passive electronic filter is configured to prevent the ambient output from passing through to the controller preferably, wherein the passive electronic filter is configured to let the article output pass through.14.A method for determination of an aerosol-generating article with an aerosol-generating device, comprising the steps of:emitting electromagnetic radiation of a predetermined spectrum with an emitter,detecting an intensity of ambient electromagnetic radiation with a sensor,adjusting the sensor based on the detected intensity of the ambient electromagnetic radiation, anddetecting the electromagnetic radiation of a predetermined spectrum with the adjusted sensor, anddetermining the aerosol-generating article with a controller based on the detected electromagnetic radiation of a predetermined spectrum, preferably wherein the at least one electronic sensor adjustment component is a gain-selectable amplifier adjustable by the controller.15.An aerosol-generating system comprising the aerosol-generating device according to any of the preceding claims and an aerosol-generating article, preferably wherein the ambient electromagnetic radiation of the predetermined spectrum is reflected on the aerosol-generating article, preferably a taggant signature, when the aerosol-generating article is received in the cavity.
Citation Information
Patent Citations
Vaping device having an optical sensor for data reception
EP3977874A1
Method and system for determining information related to a drug reservoir
US20130072897A1
Lighter actuation system
US5967148A
Optical spectral detector for aerosol generating device
WO2023031267A1