EP4074200A1

EP4074200A1 - Inhalation device, control method, and program

Info

Publication number: EP4074200A1
Application number: EP20933376.4A
Authority: EP
Inventors: Kentaro Yamada
Original assignee: Japan Tobacco Inc
Current assignee: Japan Tobacco Inc
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2022-10-19
Also published as: JPWO2021220384A1; WO2021220384A1; EP4074200A4; TW202139866A; JP7284347B2

Abstract

[Problem] To provide a mechanism capable of improving the accuracy of detection of a puff. [Solution] This inhalation device is provided with: a heating unit for heating an aerosol source; a temperature varying unit, the temperature of which is increased due to heat generated by heating by the heating unit, and is decreased as a result of suction of an aerosol generated from the aerosol source heated by the heating unit; and a control unit for detecting suction of the aerosol when the manner of temperature decrease of the temperature varying unit meets a detection reference. The control unit changes the detection reference on the basis of the time elapsed from the start of heating of the aerosol source by the heating unit.

Description

Technical Field

The present invention relates to an inhaler device, a control method, and a program.

Background Art

Inhaler devices such as electronic cigarettes and nebulizers that generate a material to be inhaled by a user have become widely popular. For example, an inhaler device generates an aerosol to which a flavor component has been imparted by using a substrate including an aerosol source for generating an aerosol and a flavor source for imparting a flavor component to the generated aerosol. A user can taste flavor by inhaling (hereinafter also referred to as a puff) the aerosol to which the flavor component has been imparted thus generated by the inhaler device.
Offering various services according to a result of detection of a puff when a puff is detected in an inhaler device is under consideration. Although there are various puff detection methods, Patent Literature 1, for example, focuses on a decrease in temperature of a heater caused by a puff and discloses a technique for detecting a puff on the basis of a decrease in temperature of the heater.

Citation List

Patent Literature

Patent Literature 1: Japanese Patent No. 6143784

Summary of Invention

Technical Problem

However, such a technique for detecting a puff on the basis of a decrease in temperature of a heater is a recently developed technique and needs further improvement in accuracy.
The present invention was attained in view of the above problem, and an object of the present invention is to provide a mechanism that enables an improvement in accuracy of detection of a puff.

Solution to Problem

In order to solve the above problem, an aspect of the present invention provides an inhaler device including a heater that heats an aerosol source; a temperature varying unit whose temperature is increased by heat produced by heating performed by the heater and whose temperature is decreased by inhalation of an aerosol generated from the aerosol source heated by the heater; and a controller that detects inhalation of the aerosol in a case where a manner of a decrease in temperature of the temperature varying unit satisfies a detection standard, wherein the controller changes the detection standard on a basis of an elapsed time from start of heating of the aerosol source by the heater.
The controller may control the heater to perform the heating according to a predetermined heating profile and change the detection standard on a basis of an elapsed time from start of the heating according to the heating profile by the heater.
The detection standard may be that a deviation between a reference temperature and the temperature of the temperature varying unit is equal to or greater than a predetermined threshold value.
The controller may use a first threshold value as the predetermined threshold value in a case where the elapsed time is less than a first time and use a second threshold value as the predetermined threshold value in a case where the elapsed time is equal to or longer than the first time.
The first threshold value may be smaller than the second threshold value.
The controller may use the second threshold value as the predetermined threshold value in a case where the elapsed time is equal to or longer than the first time and less than a second time and use a third threshold value as the predetermined threshold value in a case where the elapsed time is equal to or longer than the second time.
The third threshold value may be smaller than the second threshold value.
The third threshold value may be larger than the first threshold value.
The controller may control the heater not to perform the heating in a case where a temperature of the temperature varying unit at a time of detection of input of an instruction to start heating by the heater is equal to or greater than a predetermined value.
The controller may change the detection standard depending on whether or not a temperature of the temperature varying unit at a time of detection of input of an instruction to start heating by the heater is equal to or greater than a predetermined value.
In a case where the temperature of the temperature varying unit is equal to or greater than the predetermined value, the controller may use, as the first threshold value, a value closer to the second threshold value than in a case where the temperature of the temperature varying unit is less than the predetermined value.
In a case where the temperature of the temperature varying unit is equal to or greater than the predetermined value, the controller may use, as the second threshold value, a value closer to the third threshold value than in a case where the temperature of the temperature varying unit is less than the predetermined value.
In a case where the temperature of the temperature varying unit is equal to or greater than the predetermined value, the controller may use a shorter time as the first time than in a case where the temperature of the temperature varying unit is less than the predetermined value.
In a case where the temperature of the temperature varying unit is equal to or greater than the predetermined value, the controller may use a shorter time as the second time than in a case where the temperature of the temperature varying unit is less than the predetermined value.
The detection standard may be that the temperature of the temperature varying unit is equal to or lower than a predetermined threshold value.
The controller may start detection of inhalation of the aerosol after the elapsed time becomes equal to or longer than a predetermined time.
The controller may change the detection standard additionally on a basis of a temperature which the temperature varying unit is assumed to have when the elapsed time elapses.
In order to solve the above problem, another aspect of the present invention provides a control method for controlling an inhaler device including a heater that heats an aerosol source and a temperature varying unit whose temperature is increased by heat produced by heating performed by the heater and whose temperature is decreased by inhalation of an aerosol generated from the aerosol source heated by the heater, the control method including changing a detection standard on a basis of an elapsed time from start of heating of the aerosol source by the heater; and detecting inhalation of the aerosol in a case where a manner of a decrease in temperature of the temperature varying unit satisfies the detection standard.
In order to solve the above problem, another aspect of the present invention provides a program for causing a computer that controls an inhaler device including a heater that heats an aerosol source and a temperature varying unit whose temperature is increased by heat produced by heating performed by the heater and whose temperature is decreased by inhalation of an aerosol generated from the aerosol source heated by the heater to: changing a detection standard on a basis of an elapsed time from start of heating of the aerosol source by the heater; and detecting inhalation of the aerosol in a case where a manner of a decrease in temperature of the temperature varying unit satisfies the detection standard.

Advantageous Effects of Invention

According to the present invention, a mechanism that enables an improvement in accuracy of detection of a puff.

Brief Description of Drawings

[Fig. 1] Fig. 1 is a schematic diagram of an inhaler device according to a configuration example according to a first embodiment.
[Fig. 2] Fig. 2 is a graph illustrating an example of a heating profile.
[Fig. 3] Fig. 3 is a graph for explaining a first control example of a first puff detection threshold value according to the embodiment.
[Fig. 4] Fig. 4 is a graph for explaining a second control example of the first puff detection threshold value according to the embodiment.
[Fig. 5] Fig. 5 is a flowchart illustrating an example of a flow of puff detection processing performed by the inhaler device according to the embodiment.
[Fig. 6] Fig. 6 is a block diagram illustrating a configuration example of an inhaler device according to a second embodiment.
[Fig. 7] Fig. 7 is a flowchart illustrating an example of a flow of processing performed by the inhaler device according to the embodiment.

Description of Embodiments

Preferred embodiments of the present invention are described in detail below with reference to the attached drawings. Note that in the specification and drawings, structural elements having substantially identical functional configurations are given identical reference signs, and repeated description thereof is omitted.

<<1. First Embodiment>>

<1.1. Configuration Example of Inhaler Device>

An inhaler device generates material to be inhaled by a user. In the example described below, the material generated by the inhaler device is an aerosol. Alternatively, the material generated by the inhaler device may be gas.
Fig. 1 is a schematic diagram of the inhaler device according to the configuration example. As illustrated in Fig. 1, an inhaler device 100 according to the present configuration example includes a power supply 111, a sensor 112, a notifier 113, a memory 114, a communicator 115, a controller 116, a heater 121, a holder 140, and a heat insulator 144.
The power supply 111 stores electric power. The power supply 111 supplies electric power to the structural elements of the inhaler device 100 under the control of the controller 116. The power supply 111 may be, for example, a rechargeable battery such as a lithium ion secondary battery.
The sensor 112 acquires various items of information regarding the inhaler device 100. In an example, the sensor 112 may be a pressure sensor such as a condenser microphone, a flow sensor, or a temperature sensor, and acquires a value generated in accordance with user's inhalation. In another example, the sensor 112 may be an input device that receives information input by the user, such as a button or a switch.
The notifier 113 provides information to the user. The notifier 113 may be a light-emitting device that emits light, a display device that displays an image, a sound output device that outputs sound, or a vibration device that vibrates.
The memory 114 stores various items of information for operation of the inhaler device 100. The memory 114 may be a non-volatile storage medium such as flash memory.
The communicator 115 is a communication interface capable of communication in conformity with any wired or wireless communication standard. Such a communication standard may be, for example, Wi-Fi (registered trademark) or Bluetooth (registered trademark).
The controller 116 functions as an arithmetic processing unit and a control circuit, and controls the overall operations of the inhaler device 100 in accordance with various programs. The controller 116 includes an electronic circuit such as a central processing unit (CPU) or a microprocessor, for example.
The holder 140 has an internal space 141, and holds a stick substrate 150 in a manner partially accommodated in the internal space 141. The holder 140 has an opening 142 that allows the internal space 141 to communicate with outside. The holder 140 holds the stick substrate 150 that is inserted into the internal space 141 through the opening 142. For example, the holder 140 may be a tubular body having the opening 142 and a bottom 143 on its ends, and may define the pillar-shaped internal space 141. The holder 140 can also define a flow path of air to be supplied to the stick substrate 150. For example, the bottom 143 has an air inlet hole that is an inlet of air into the flow path. The opening 142 serves as an air outlet hole that is an outlet of the air from the flow path.
The stick substrate 150 includes a substrate 151 and an inhalation port 152. The substrate 151 includes an aerosol source. The aerosol source according to the present configuration example is not limited to a liquid. The aerosol source may be a solid. The stick substrate 150 held by the holder 140 includes the substrate 151 at least partially accommodated in the internal space 141 and the inhalation port 152 at least partially protruding from the opening 142. When the user inhales with the inhalation port 152 protruding from the opening 142 in his/her mouth, air flows into the internal space 141 through the air inlet hole (not illustrated), and the air and an aerosol generated from the substrate 151 reach inside the mouth of the user.
The heater 121 heats the aerosol source to atomize the aerosol source and generate the aerosol. In the example illustrated in Fig. 1, the heater 121 has a film-like shape and surrounds the outer circumference of the holder 140. Subsequently, heat produced from the heater 121 heats the substrate 151 of the stick substrate 150 from the outer circumference, generating the aerosol. The heater 121 produces heat when receiving electric power from the power supply 111. In an example, the electric power may be supplied in response to the sensor 112 detecting a start of the user's inhalation and/or an input of predetermined information. Subsequently, the supply of the electric power may be stopped in response to the sensor 112 detecting an end of the user's inhalation and/or an input of predetermined information.
The heat insulator 144 prevents heat from transferring from the heater 121 to the other structural elements. For example, the heat insulator 144 may be a vacuum heat insulator or an aerogel heat insulator.
The configuration example of the inhaler device 100 has been described above. The inhaler device 100 is not limited to the above configuration, and may be configured in various ways as exemplified below.
In an example, the heater 121 may have a blade-like shape, and may be disposed so that the heater 121 protrudes from the bottom 143 of the holder 140 toward the internal space 141. In this case, the heater 121 having the blade-like shape is inserted into the substrate 151 of the stick substrate 150 and heats the substrate 151 of the stick substrate 150 from its inside. In another example, the heater 121 may be disposed so that the heater 121 covers the bottom 143 of the holder 140. In still another example, the heater 121 may be implemented as a combination of two or more selected from a first heater that covers the outer circumference of the holder 140, a second heater having the blade-like shape, and a third heater that covers the bottom 143 of the holder 140.
In another example, the holder 140 may include an opening/closing mechanism that at least partially opens and closes an outer shell defining the internal space 141. Examples of the opening/closing mechanism include a hinge. In addition, the holder 140 may sandwich the stick substrate 150 inserted into the internal space 141 by opening and closing the outer shell. In this case, the heater 121 may be at the sandwiching position of the holder 140 and may produce heat while pressing the stick substrate 150.
In addition, means for atomizing the aerosol source is not limited to heating by the heater 121. For example, the means for atomizing the aerosol source may be induction heating.

<1.2. Technical Features>

(1) Temperature Change of Temperature Varying Unit

The heater 121 heats the aerosol source. More specifically, the heater 121 heats the aerosol source included in the stick substrate 150 by heating the stick substrate 150 held by the holder 140. As a result, an aerosol is generated.
The sensor 112 includes a temperature varying unit as a temperature sensor. The temperature varying unit is a member whose temperature is increased or decreased by transfer of heat.
The temperature of the temperature varying unit is increased by heat produced by heating by the heater 121. In an example, the temperature varying unit may be provided close to the heater 121. In this case, the temperature of the temperature varying unit is increased by heat transferred from the heater 121 through a housing. In another example, the temperature varying unit may be provided close to the flow path of air between the air inlet hole and the air outlet hole. In this case, the temperature of the temperature varying unit is increased by heat transferred from an aerosol generated from the aerosol source heated by the heater 121 when the aerosol flows out to the flow path.
The temperature of the temperature varying unit is decreased by inhalation of an aerosol generated from the aerosol source heated by the heater 121. More specifically, when the user puffs, outside air flows into the flow path of air in exchange for user's inhalation of the aerosol. The outside air is not influenced by heating by the heater 121 and therefore has a temperature lower than a temperature of air existing in the flow path. Accordingly, when the outside sir flows into the flow path of air, the structural elements close to the flow path are cooled by the outside air. As a result, the temperature of the temperature varying unit also decreases.
The controller 116 detects the temperature of the temperature varying unit. For example, the temperature varying unit may be a thermistor. The thermistor is a member whose electric resistance changes in accordance with a change in temperature. In this case, the controller 116 detects the temperature of the temperature varying unit on the basis of the electric resistance of the thermistor.
Furthermore, the controller 116 may detect a temperature of the heater 121. In an example, the heater 121 may include a conductive track including a resistor. In this case, the controller 116 detects the temperature of the heater 121 on the basis of electric resistance of the conductive track. In another example, a thermistor may be provided close to the heater 121. In this case, the controller 116 detects the temperature of the heater 121 on the basis of electric resistance of the thermistor.

(2) Heating According to Heating Profile

The controller 116 controls the heater 121 to perform heating according to a predetermined heating profile. The heating profile is information that defines the temperature of the heater 121 that changes in accordance with an elapsed time from start of heating. The controller 116 controls the heater 121 so that a temperature change similar to a temperature change in the heating profile is realized in the heater 121. The control of the heater 121 can be realized, for example, by controlling supply of electric power from the power supply 111 to the heater 121. The supply of electric power may be, for example, controlled by pulse width modulation (PWM).
In a case where the heater 121 performs heating according to the heating profile, a change in temperature of the temperature varying unit can be assumed in advance. Fig. 2 is a graph illustrating an example of a relationship between the heating profile and an assumed temperature of the temperature varying unit. The assumed temperature is a temperature assumed as a temperature of the temperature varying unit. The horizontal axis of the graph is an elapsed time from start of heating by the heater 121. The vertical axis of the graph is a temperature. A line 90 indicates an example of the heating profile. A line 10 indicates an example of a temperature change assumed in the temperature varying unit. The inhaler device 100 controls the heater 121 so that a temperature change similar to a temperature change in the heating profile indicated by the line 90 is realized in the heater 121. As a result, the temperature change indicated by the line 10 is realized in the temperature varying unit. As illustrated in Fig. 2, it is assumed that a rate of temperature increase of the temperature varying unit is lower than a rate of temperature increase of the heater 121. This is because a time lag occurs in heat transfer. Furthermore, as illustrated in Fig. 2, it is assumed that a highest temperature of the temperature varying unit is lower than a highest temperature of the heater 121. This is because the heater 121 and the temperature varying unit are provided at separate positions.
Heating performed by the heater 121 can be classified into preliminary heating and main heating. The preliminary heating is heating performed until a predetermined time elapses from start of heating according to the heating profile or until the temperature of the heater 121 reaches a predetermined temperature. The main heating is heating performed after the preliminary heating. In the example illustrated in Fig. 2, heating performed before elapse of a time T₀ is the preliminary heating, and heating performed after elapse of the time T₀ is the main heating. Hereinafter, an elapsed time from start of heating is also referred to simply as an elapsed time.
An assumed temperature of the temperature varying unit at a timing at which the preliminary heating ends is also referred to as a first target temperature. The first target temperature is a temperature at which an aerosol is sufficiently generated from the stick substrate 150 in a case where the temperature of the temperature varying unit reaches the first target temperature due to heating of the stick substrate 150 performed by the heater 121. For example, a large amount of aerosol sufficient for user's inhalation is generated when the temperature of the temperature varying unit reaches the first target temperature. This allows the user to inhale a sufficient amount of aerosol by inhaling with the stick substrate 150 in his/her mouth after the preliminary heating. Note that the first target temperature is a temperature higher than a lower limit of a temperature of the temperature varying unit at which generation of the aerosol is assumed. That is, the aerosol can be generated even in a case where the temperature of the temperature varying unit has not reached the first target temperature.
The temperature of the temperature varying unit can increase not only during a period in which the preliminary heating is performed but also during a period in which the main heating is performed. As a result, the temperature of the temperature varying unit reaches a second target temperature higher than the first target temperature. According to such a configuration, a sufficient amount of aerosol can be continuously generated from the stick substrate 150. It is assumed that the temperature of the temperature varying unit is increased to the second target temperature and thereafter the second target temperature is maintained by heating according to the heating profile (see the line 10 of Fig. 2).

(3) Puff Detection

The inhaler device 100 according to the present embodiment performs puff detection focused on a decrease in temperature of the temperature varying unit caused by a puff. More specifically, the controller 116 detects inhalation of the aerosol, that is, a puff in a case where a manner of a decrease in temperature of the temperature varying unit satisfies a detection standard. The controller 116 changes the detection standard on the basis of an elapsed time from start of heating of the aerosol source by the heater 121. The manner of a decrease in temperature of the temperature varying unit caused by a puff can vary depending on an elapsed time from start of heating. In this respect, accuracy of puff detection can be improved according to the configuration.
More specifically, the controller 116 changes the detection standard on the basis of an elapsed time from start of heating according to the heating profile performed by the heater 121. The manner of a decrease in temperature of the temperature varying unit caused by a puff can vary depending on the heating profile. In this respect, accuracy of puff detection can be improved according to the configuration.
The detection standard may be that a deviation between a reference temperature and the temperature of the temperature varying unit is equal to or greater than a predetermined threshold value (hereinafter referred to as a first puff detection threshold value). That is, the controller 116 detects a puff in a case where the deviation between the reference temperature and the temperature of the temperature varying unit is equal to or greater than the first puff detection threshold value. On the other hand, the controller 116 does not detect a puff in a case where the deviation between the reference temperature and the temperature of the temperature varying unit is less than the first puff detection threshold value. In an example, the reference temperature may be the assumed temperature of the temperature varying unit. In this case, the controller 116 detects a puff in a case where a deviation between a temperature of the temperature varying unit at a certain time and an assumed temperature of the temperature varying unit at the certain time is equal to or greater than the first puff detection threshold value. In another example, the reference temperature may be a temperature of the temperature varying unit detected a predetermined period earlier. In this case, the controller 116 detects a puff in a case where a deviation between a temperature of the temperature varying unit at a certain time and a temperature of the temperature varying unit at a time that is predetermined period earlier than the certain time (e.g., at a time immediately before the certain time) is equal to or greater than the first puff detection threshold value. According to such a configuration, a puff can be detected on the basis of a width of a temperature decrease of the temperature varying unit caused by the puff.
The puff detection can be performed to determine a lifetime of the stick substrate 150. The lifetime of the stick substrate 150 is a period before exhaustion of the aerosol source included in the stick substrate 150. The lifetime of the stick substrate 150 becomes shorter as an amount of aerosol generated by heating performed by the heater 121 increases and as the aerosol is inhaled by a puff.

(4) Control of Detection Standard

As described above, a manner of a decrease in temperature of the temperature varying unit caused by a puff can vary depending on an elapsed time from start of heating. Specifically, a width of a temperature decrease of the temperature varying unit caused by a puff can vary depending on an elapsed time from start of heating. Accordingly, in a case where the same value is continuously used as the first puff detection threshold value irrespective of an elapsed time from start of heating, accuracy of detection of a puff can decrease. For example, a puff may be detected even though the user actually puffs or a puff may be erroneously detected even though the user does not actually puff.
In view of this, the controller 116 changes the detection standard and performs control of changing the first puff detection threshold value. According to such a configuration, accuracy of detection of a puff can be improved. An example of control of the first puff detection threshold value is described below.

- First Control Example

The temperature of the temperature varying unit increases as an elapsed time from start of heating becomes longer. That is, a difference in temperature between the temperature varying unit and outside air changes depending on an elapsed time from start of heating, and a width of a temperature decrease of the temperature varying unit caused by a puff also changes accordingly. Accordingly, accuracy of detection of a puff can decrease in a case where the same value is continuously used as the first puff detection threshold value irrespective of an elapsed time from start of heating.
In view of the above problem, the controller 116 uses a first threshold value as the first puff detection threshold value in a case where the elapsed time is less than a first time. The controller 116 uses a second threshold value as the first puff detection threshold value in a case where the elapsed time is equal to or longer than the first time. According to such a configuration, the detection standard can be changed in accordance with a change in width of a temperature decrease of the temperature varying unit caused by a puff, and therefore an improvement in accuracy of detection of a puff can be expected. The first threshold value is smaller than the second threshold value. According to such a configuration, accuracy of detection of a puff can be improved as described in detail with reference to Fig. 3.
Fig. 3 is a graph for explaining a first control example of the first puff detection threshold value according to the present embodiment. The horizontal axis of the graph is an elapsed time from start of heating by the heater 121. The vertical axis of the graph is a temperature. A line 10 is an example of a temperature change assumed to occur in the temperature varying unit. A line 20 indicates an example of an actual temperature change of the temperature varying unit. A time T₁ is an example of the first time. A threshold value TH_a is an example of the first threshold value. A threshold value TH_b is an example of the second threshold value. That is, the threshold value TH_a is smaller than the threshold value TH_b.
Before elapse of the time T₁, the controller 116 detects a puff in a case where a deviation TMP_DIFF between the assumed temperature of the temperature varying unit and an actual temperature of the temperature varying unit is equal to or greater than the threshold value TH_a. As illustrated in Fig. 3, before elapse of the time T₁, the temperature of the temperature varying unit is lower than that after elapse of the time T₁. Accordingly, before elapse of the time T₁, a temperature difference between the temperature varying unit and outside air is smaller and therefore a width of a temperature decrease of the temperature varying unit caused by a puff is considered to be smaller than those after elapse of the time T₁. In this respect, accuracy of detection of a puff can be improved by performing puff detection on the basis of the relatively small threshold value TH_a. For example, it is possible to prevent a situation where a puff is not detected even though the user puffs.
On the other hand, after elapse of the time T₁, the controller 116 detects a puff in a case where the deviation TMP_DIFF between the assumed temperature of the temperature varying unit and the actual temperature of the temperature varying unit is equal to or greater than the threshold value TH_b. As illustrated in Fig. 3, after elapse of the time T₁, the temperature of the temperature varying unit is higher than that before elapse of the time T₁. Accordingly, after elapse of the time T₁, a temperature difference between the temperature varying unit and outside air is larger and therefore a width of a temperature decrease of the temperature varying unit caused by a puff is larger than those before elapse of the time T₁. In this respect, it is possible to improve accuracy of detection of a puff by performing puff detection on the basis of the relatively large threshold value TH_b. For example, it is possible to prevent a situation where a puff is erroneously detected due to a small temperature decrease caused by entry of wind into the flow path of air.

- Second Control Example

The temperature of the temperature varying unit increases as an elapsed time from start of heating becomes longer. However, a temperature distribution of the temperature varying unit is not necessarily uniform, and the temperature varying unit are considered to have a high-temperature portion and a low-temperature portion. For example, the temperature varying unit can actually include a portion whose temperature has not reached the second target temperature when it is detected that the temperature of the temperature varying unit has reached the second target temperature. The portion of the temperature varying unit whose temperature has not reached the second target temperature becomes smaller as a time that elapses from the time at which it is detected that the temperature of the temperature varying unit has reached the second target temperature becomes longer. An amount of accumulated heat of the whole temperature varying unit increases accordingly, and therefore a cooling effect of outside air becomes smaller. As a result, a width of a temperature decrease of the temperature varying unit caused by a puff decreases. Therefore, accuracy of detection of a puff can decrease unless such a change in temperature distribution of the temperature varying unit is considered.
In view of the above problem, the controller 116 uses the first threshold value as the first puff detection threshold value in a case where the elapsed time is less than the first time. The controller 116 uses the second threshold value as the first puff detection threshold value in a case where the elapsed time is equal to or longer than the first time and less than a second time. The controller 116 uses a third threshold value as the first puff detection threshold value in a case where the elapsed time is equal to or longer than the second time. According to the configuration, the detection standard can be changed in accordance with a change in width of a temperature decrease of the temperature varying unit caused by a puff, and therefore an improvement in accuracy of detection of a puff can be expected. The first threshold value is smaller than the second threshold value. The third threshold value is smaller than the second threshold value. According to the configuration, accuracy of detection of a puff can be improved as described in detail with reference to Fig. 4.
Fig. 4 is a graph for explaining a second control example of the first puff detection threshold value according to the present embodiment. The horizontal axis of the graph is an elapsed time from start of heating by the heater 121. The vertical axis of the graph is a temperature. A line 10 is an example of a temperature change assumed to occur in the temperature varying unit. A line 20 indicates an example of an actual temperature change of the temperature varying unit. The time T₁ is an example of the first time. The time T₂ is an example of the second time. The threshold value TH_A is an example of the first threshold value. The threshold value TH_B is an example of the second threshold value. The threshold value TH_C is an example of the third threshold value. That is, the threshold value TH_A is smaller than the threshold value TH_B. The threshold value TH_C is smaller than the threshold value TH_B.
Before elapse of the time T₁, the controller 116 detects a puff in a case where a deviation TMP_DIFF between the assumed temperature of the temperature varying unit and the actual temperature of the temperature varying unit is equal to or greater than the threshold value TH_A. According to the configuration, accuracy of detection of a puff can be improved, as described above in the first control example.
After elapse of the time T₁ and before elapse of the time T₂, the controller 116 detects a puff in a case where the deviation TMP_DIFF between the assumed temperature of the temperature varying unit and the actual temperature of the temperature varying unit is equal to or greater than the threshold value TH_B. According to the configuration, accuracy of detection of a puff can be improved, as described above in the first control example.
Furthermore, after elapse of the time T₂, the controller 116 detects a puff in a case where the deviation TMP_DIFF between the assumed temperature of the temperature varying unit and the actual temperature of the temperature varying unit is equal to or greater than the threshold value TH_C. As described above, a width of a temperature decrease of the temperature varying unit caused by a puff is considered to become smaller as an elapsed time from a time at which it is determined that the temperature of the temperature varying unit has reached the second target temperature becomes longer. For example, a width of a temperature decrease caused by a puff at a time at which the time T₂ elapses is considered to be smaller than a width of a temperature decrease caused by a puff at a time at which the time T₁ elapses. In this respect, accuracy of detection of a puff can be improved by performing puff detection on the basis of the threshold value TH_C smaller than the threshold value TH_B. For example, it is possible to prevent a situation where a puff is not detected even though the user puffs.
The third threshold value may be greater than the first threshold value. That is, the following relationship may be established: the threshold value TH_A < the threshold value TH_C < the threshold value TH_B. As illustrated in Fig. 4, after elapse of the time T₂, the temperature of the temperature varying unit is higher than that before elapse of the time T₁. Accordingly, after elapse of the time T₂, a temperature difference between the temperature varying unit and outside air is larger and therefore a width of a temperature decrease of the temperature varying unit caused by a puff is considered to be larger than those before elapse of the time T₁. In this respect, accuracy of detection of a puff can be improved by performing puff detection on the basis of the relatively large threshold value TH_C. For example, it is possible to prevent a situation where a puff is erroneously detected due to a small temperature decrease caused by entry of wind into the flow path of air.

(5) Other Features of Puff Detection

The controller 116 may start puff detection after the elapsed time becomes equal to or longer than a predetermined time. An example of the predetermined time is a time it takes to reach the first target temperature. That is, the controller 116 may start puff detection after the preliminary heating ends and the main heating is performed. In the example illustrated in Figs. 3 and 4, the controller 116 may start puff detection after elapse of the time T₀. During the preliminary heating, the stick substrate 150 is not sufficiently heated, and an amount of generated aerosol is smaller than that during the main heating. Accordingly, the lifetime of the stick substrate 150 is harder to be shortened by a puff. According to the configuration, in a case where puff detection is performed to determine the lifetime of the stick substrate 150, it is therefore possible to improve accuracy of determination of the lifetime of the stick substrate 150 by excluding a puff during the preliminary heating from a target of the puff detection.
The controller 116 may control the heater 121 not to perform heating in a case where a temperature of the temperature varying unit at a time of detection of input of an instruction to start heating by the heater 121 is equal to or greater than a predetermined value (hereinafter also referred to as a remaining heat determination threshold value). In a case where an interval between previous heating and heating performed this time is short, the temperature varying unit has remaining heat resulting from the previous heating in some cases. When heating is started in this state, the temperature of the temperature varying unit is deviated from an assumed temperature even in a state where a puff is not performed, and therefore accuracy of detection of a puff can decrease. In this respect, according to the configuration, heating is not performed in the first place, and therefore detection of a puff is not performed either. It is therefore possible to prevent erroneous detection of a puff.
Needless to say, the controller 116 may control the heater 121 to perform heating even in a case where a temperature of the temperature varying unit at a time of detection of input of an instruction to start heating by the heater 121 is equal to or greater than the remaining heat determination threshold value. In this case, the controller 116 changes the detection standard depending on whether or not the temperature of the temperature varying unit at a time of detection of input of an instruction to start heating by the heater 121 is equal to or greater than the remaining heat determination threshold value. As described above, in a case where an interval between previous heating and heating performed this time is short, the temperature varying unit has remaining heat resulting from the previous heating in some cases. When heating is started in this state, the temperature of the temperature varying unit is deviated from the assumed temperature even in a state where a puff is not performed. In view of this, the controller 116 sets the first puff detection threshold value in consideration of the deviation. According to the configuration, even in a case where an interval between previous heating and heating performed this time is short, accuracy of detection of a puff can be maintained.
As a first example of change of the detection standard, in a case where the temperature of the temperature varying unit is equal to or higher than the remaining heat determination threshold value, the controller 116 may use, as the first threshold value, a value closer to the second threshold value than in a case where the temperature of the temperature varying unit is less than the remaining heat determination threshold value. In other words, in a case where the temperature of the temperature varying unit is equal to or higher than the remaining heat determination threshold value, the controller 116 may use a higher value as the first threshold value than in a case where the temperature of the temperature varying unit is less than the remaining heat determination threshold value. For example, the controller 116 may make the threshold value TH_a closer to the threshold value TH_b in the example illustrated in Fig. 3. This is because, due to remaining heat, a manner of a decrease in temperature of the temperature varying unit caused by a puff during a section to which the first threshold value is applied becomes closer to a manner of a decrease in temperature of the temperature varying unit caused by a puff during a section to which the second threshold value is applied. According to the configuration, accuracy of detection of a puff can be maintained.
Meanwhile, in a case where the temperature of the temperature varying unit is equal to or higher than the remaining heat determination threshold value, the controller 116 may use, as the second threshold value, a value closer to the third threshold value than in a case where the temperature of the temperature varying unit is less than the remaining heat determination threshold value. In other words, in a case where the temperature of the temperature varying unit is equal to or higher than the remaining heat determination threshold value, the controller 116 may use a lower value as the second threshold value than in a case where the temperature of the temperature varying unit is less than the remaining heat determination threshold value. For example, the controller 116 may make the threshold value TH_B closer to the threshold value TH_C in the example illustrated in Fig. 4. This is because, due to remaining heat, a manner of a decrease in temperature of the temperature varying unit caused by a puff during a section to which the second threshold value is applied becomes closer to a manner of a decrease in temperature of the temperature varying unit caused by a puff during a section to which the third threshold value is applied. According to the configuration, accuracy of detection of a puff can be maintained.
As a second example of change of the detection standard, in a case where the temperature of the temperature varying unit is equal to or higher than the remaining heat determination threshold value, the controller 116 may use, as the first time, a time shorter than that in a case where the temperature of the temperature varying unit is less than the remaining heat determination threshold value. This is because a timing at which the second threshold value should be applied arrives earlier due to remaining heat. From another perspective, in a case where the temperature of the temperature varying unit is equal to or higher than the remaining heat determination threshold value, the controller 116 may shorten a period in which the first threshold value is applied as compared with a case where the temperature of the temperature varying unit is less than the remaining heat determination threshold value. According to the configuration, accuracy of detection of a puff can be maintained.
Similarly, in a case where the temperature of the temperature varying unit is equal to or higher than the remaining heat determination threshold value, the controller 116 may use, as a second time, a time shorter than that in a case where the temperature of the temperature varying unit is less than the remaining heat determination threshold value. This is because a timing at which the third threshold value should be applied arrives earlier due to remaining heat. From another perspective, in a case where the temperature of the temperature varying unit is equal to or higher than the remaining heat determination threshold value, the controller 116 may shorten a period in which the second threshold value is applied as compared with a case where the temperature of the temperature varying unit is less than the remaining heat determination threshold value. According to the configuration, accuracy of detection of a puff can be maintained.

(6) Flow of Processing

Fig. 5 is a flowchart illustrating an example of a flow of puff detection processing performed by the inhaler device 100 according to the present embodiment. This flow is an example of a flow of puff detection processing in the example illustrated in Fig. 4.
As illustrated in Fig. 5, first, the inhaler device 100 determines whether or not a user's heating start instruction has been detected (step S102). For example, the inhaler device 100 determines whether or not a button provided on the inhaler device 100 has been pressed. In a case where no user's heating start instruction has been detected (step S102: NO), the inhaler device 100 waits until a user's heating start instruction is detected.
In a case where a user's heating start instruction has been detected (step S102: YES), the inhaler device 100 starts heating according to the heating profile (step S104).
Next, the inhaler device 100 determines whether or not the time T₀ has elapsed (step S106). In a case where it is determined that the time T₀ has not elapsed (step S106: NO), the inhaler device 100 waits until the time T₀ elapses.
In a case where it is determined that the time T₀ has elapsed (step S106: YES), the inhaler device 100 detects a puff on the basis of the threshold value TH_A (step S108). For example, the controller 116 detects a puff in a case where the deviation TMP_DIFF between the assumed temperature of the temperature varying unit and the actual temperature of the temperature varying unit is equal to or greater than the threshold value TH_A.
Next, the inhaler device 100 determines whether or not the time T₁ has elapsed (step S110). In a case where it is determined that the time T₁ has not elapsed (step S110: NO), the inhaler device 100 performs the process in step S108 until the time T₁ elapses.
In a case where it is determined that the time T₁ has elapsed (step S110: YES), the inhaler device 100 detects a puff on the basis of the threshold value TH_B (step S112). For example, the controller 116 detects a puff in a case where the deviation TMP_DIFF between the assumed temperature of the temperature varying unit and the actual temperature of the temperature varying unit is equal to or greater than the threshold value TH_B.
Next, the inhaler device 100 determines whether or not the time T₂ has elapsed (step S114). In a case where it is determined that the time T₂ has not elapsed (step S114: NO), the inhaler device 100 performs the process in step S112 until the time T₂ elapses.
In a case where it is determined that the time T₂ has elapsed (step S114: YES), the inhaler device 100 detects a puff on the basis of the threshold value TH_C (step S116). For example, the controller 116 detects a puff in a case where the deviation TMP_DIFF between the assumed temperature of the temperature varying unit and the actual temperature of the temperature varying unit is equal to or greater than the threshold value TH_C.
An example of a flow of puff detection processing has been described above. Note that the process in step S116 may be continuously performed until the heating according to the heating profile is finished.

<<2. Second Embodiment>>

Fig. 6 is a block diagram illustrating a configuration example of an inhaler device 900 according to the second embodiment. As illustrated in Fig. 6, the inhaler device 900 includes a heater 910, a temperature varying unit 920, and a controller 930.
The heater 910 heats an aerosol source.
A temperature of the temperature varying unit 920 is increased by heat produced by heating performed by the heater 910 and is decreased by inhalation of an aerosol generated from the aerosol source heated by the heater 910.
The controller 930 detects inhalation of the aerosol in a case where a manner of a decrease in temperature of the temperature varying unit 920 satisfies a detection standard. The controller 930 changes the detection standard on the basis of an elapsed time from start of heating of the aerosol source by the heater 910.
Next, a flow of processing in the inhaler device 900 according to the present embodiment is described. Fig. 7 is a flowchart illustrating an example of a flow of processing performed by the inhaler device 900 according to the present embodiment.
As illustrated in Fig. 7, first, the controller 930 changes the detection standard on the basis of an elapsed time from start of heating of the aerosol source by the heater 910 (step S202).
Then, the controller 930 detects inhalation of an aerosol in a case where a manner of a decrease in temperature of the temperature varying unit 920 satisfies the detection standard (step S204).
The manner of a decrease in temperature of the temperature varying unit 920 caused by inhalation of an aerosol can vary depending on an elapsed time from start of heating of the aerosol source by the heater 910. In this respect, according to the present embodiment, the detection standard changes depending on an elapsed time from start of heating of the aerosol source by the heater 910. Therefore, the controller 930 can detect inhalation of an aerosol in accordance with a change of the manner of a decrease in temperature of the temperature varying unit 920 caused by inhalation of an aerosol. That is, according to the present embodiment, accuracy of detection of inhalation of an aerosol can be improved.
Therefore, effects similar to those in the first embodiment can also be produced in the present embodiment.

<<3. Summary>>

Although preferred embodiments of the present invention have been described above with reference to the attached drawings, the present invention is not limited to these examples. It is apparent that a person skilled in the art to which the present invention pertains can arrive at various changes or modifications within the technical idea described in the claims, and it should be understood that these changes or modifications are encompassed within the technical scope of the present invention.
For example, although an example in which the detection standard is that a deviation between a reference temperature and a temperature of the temperature varying unit is equal to or greater than the first puff detection threshold value has been described in the above embodiments, the present invention is not limited to this example. For example, the detection standard may be that the temperature of the temperature varying unit is equal to or lower than a predetermined threshold value (hereinafter also referred to as a second puff detection threshold value). For example, the second puff detection threshold value may be set as a value obtained by subtracting a predetermined value from an assumed temperature of the temperature varying unit. The controller 116 changes the second puff detection threshold value in accordance with an elapsed time as in the above embodiments. According to the configuration, effects similar to those in the above embodiment can be produced.
As one example, in the example illustrated in Fig. 2, before elapse of the time T₁, the controller 116 may use, as the second puff detection threshold value, a value obtained by subtracting the threshold value TH_a from the assumed temperature of the temperature varying unit. Similarly, after elapse of the time T₁, the controller 116 may use, as the second puff detection threshold value, a value obtained by subtracting the threshold value TH_b from the assumed temperature of the temperature varying unit.
As another example, in the example illustrated in Fig. 3, before elapse of the time T₁, the controller 116 may use, as the second puff detection threshold value, a value obtained by subtracting the threshold value TH_A from the assumed temperature of the temperature varying unit. Similarly, after elapse of the time T₁ and before elapse of the time T₂, the controller 116 may use, as the second puff detection threshold value, a value obtained by subtracting the threshold value TH_B from the assumed temperature of the temperature varying unit. After elapse of the time T₂, the controller 116 may use, as the second puff detection threshold value, a value obtained by subtracting the threshold value TH_C from the assumed temperature of the temperature varying unit.
Note that until the time T₁ elapses, the assumed temperature of the temperature varying unit increases, and therefore the second puff detection threshold value also increases accordingly. Instead of this, a fixed value may be used as the second puff detection threshold value until the time T₁ elapses. According to the configuration, a processing load for controlling the second puff detection threshold value can be lessened. Furthermore, the second puff detection threshold value may be set in advance on the basis of the assumed temperature of the temperature varying unit.
Furthermore, for example, although the detection standard is changed in accordance with an elapsed time from start of heating in the above embodiments, the present invention is not limited to such an example. For example, in addition to or instead of an elapsed time from start of heating, the controller 116 may change the detection standard on the basis of an assumed temperature of the temperature varying unit that is assumed when the elapsed time elapses. In an example, the assumed temperature of the temperature varying unit may further increase or decrease after reaching the second target temperature. In this case, the controller 116 changes the detection standard in accordance with the change of the assumed temperature. For example, the controller 116 may make the first puff detection threshold value smaller as the assumed temperature of the temperature varying unit decreases. This is because it is assumed that as the assumed temperature of the temperature varying unit decreases, an assumed temperature difference between the temperature varying unit and outside air becomes smaller, and a width of a temperature decrease of the temperature varying unit caused by a puff becomes smaller. On the other hand, the controller 116 may make the first puff detection threshold value larger as the assumed temperature of the temperature varying unit increases. This is because it is assumed that as the assumed temperature of the temperature varying unit increases, an assumed temperature difference between the temperature varying unit and outside air becomes larger, and a width of a temperature decrease of the temperature varying unit caused by a puff becomes larger. According to the configuration, a proper detection standard according to an assumed temperature difference between the temperature varying unit and outside air that changes in accordance with an assumed temperature of the temperature varying unit can be used, and therefore accuracy of detection of a puff can be improved.
Note that the series of processes performed by each device described herein may be realized by using software, hardware, or a combination of software and hardware. Programs that constitute the software are, for example, stored in advance in a recording medium (non-transitory medium) provided inside or outside the device. The programs are, for example, loaded into a RAM when executed by a computer and is executed by a processor such as a CPU. Examples of the recording medium include a magnetic disk, an optical disk, a magneto optical disk, and a flash memory. The computer programs may be, for example, distributed over a network without using a recording medium.
Furthermore, processes described herein by using the flowchart and the sequence diagram need not necessarily be performed in an illustrated order. Some processing steps may be executed in parallel. Furthermore, an additional processing step may be employed or a processing step may be omitted.

Reference Signs List

100: inhaler device
111: power supply
112: sensor
113: notifier
114: memory
115: communicator
116: controller
121: heater
140: holder
141: internal space
142: opening
143: bottom
144: heat insulator
150: stick substrate
151: substrate
152: inhalation port

Claims

An inhaler device comprising:
a heater that heats an aerosol source;

a temperature varying unit whose temperature is increased by heat produced by heating performed by the heater and whose temperature is decreased by inhalation of an aerosol generated from the aerosol source heated by the heater; and

a controller that detects inhalation of the aerosol in a case where a manner of a decrease in temperature of the temperature varying unit satisfies a detection standard,

wherein the controller changes the detection standard on a basis of an elapsed time from start of heating of the aerosol source by the heater.
The inhaler device according to Claim 1, wherein
the controller controls the heater to perform the heating according to a predetermined heating profile and changes the detection standard on a basis of an elapsed time from start of the heating according to the heating profile by the heater.
The inhaler device according to Claim 1 or 2, wherein
the detection standard is that a deviation between a reference temperature and the temperature of the temperature varying unit is equal to or greater than a predetermined threshold value.
The inhaler device according to Claim 3, wherein
the controller uses a first threshold value as the predetermined threshold value in a case where the elapsed time is less than a first time and uses a second threshold value as the predetermined threshold value in a case where the elapsed time is equal to or longer than the first time.
The inhaler device according to Claim 4, wherein
the first threshold value is smaller than the second threshold value.
The inhaler device according to Claim 4 or 5, wherein
the controller uses the second threshold value as the predetermined threshold value in a case where the elapsed time is equal to or longer than the first time and less than a second time and uses a third threshold value as the predetermined threshold value in a case where the elapsed time is equal to or longer than the second time.
The inhaler device according to Claim 6, wherein
the third threshold value is smaller than the second threshold value.
The inhaler device according to Claim 6 or 7, wherein
the third threshold value is larger than the first threshold value.
The inhaler device according to any one of Claims 1 to 8, wherein
the controller controls the heater not to perform the heating in a case where a temperature of the temperature varying unit at a time of detection of input of an instruction to start heating by the heater is equal to or greater than a predetermined value.
The inhaler device according to any one of Claims 1 to 8, wherein
the controller changes the detection standard depending on whether or not a temperature of the temperature varying unit at a time of detection of input of an instruction to start heating by the heater is equal to or greater than a predetermined value.
The inhaler device according to Claim 10 depending from any one of Claims 4 to 8, wherein
in a case where the temperature of the temperature varying unit is equal to or greater than the predetermined value, the controller uses, as the first threshold value, a value closer to the second threshold value than in a case where the temperature of the temperature varying unit is less than the predetermined value.
The inhaler device according to Claim 10 depending from any one of Claims 6 to 8, wherein
in a case where the temperature of the temperature varying unit is equal to or greater than the predetermined value, the controller uses, as the second threshold value, a value closer to the third threshold value than in a case where the temperature of the temperature varying unit is less than the predetermined value.
The inhaler device according to Claim 10 depending from any one of Claims 4 to 8, wherein
in a case where the temperature of the temperature varying unit is equal to or greater than the predetermined value, the controller uses a shorter time as the first time than in a case where the temperature of the temperature varying unit is less than the predetermined value.
The inhaler device according to Claim 10 depending from any one of Claims 6 to 8, wherein
in a case where the temperature of the temperature varying unit is equal to or greater than the predetermined value, the controller uses a shorter time as the second time than in a case where the temperature of the temperature varying unit is less than the predetermined value.
The inhaler device according to Claim 1 or 2, wherein
the detection standard is that the temperature of the temperature varying unit is equal to or lower than a predetermined threshold value.
The inhaler device according to any one of Claims 1 to 15, wherein
the controller starts detection of inhalation of the aerosol after the elapsed time becomes equal to or longer than a predetermined time.
The inhaler device according to any one of Claims 1 to 16, wherein
the controller changes the detection standard additionally on a basis of a temperature which the temperature varying unit is assumed to have when the elapsed time elapses.
A control method for controlling an inhaler device including a heater that heats an aerosol source and a temperature varying unit whose temperature is increased by heat produced by heating performed by the heater and whose temperature is decreased by inhalation of an aerosol generated from the aerosol source heated by the heater, the control method comprising:
changing a detection standard on a basis of an elapsed time from start of heating of the aerosol source by the heater; and

detecting inhalation of the aerosol in a case where a manner of a decrease in temperature of the temperature varying unit satisfies the detection standard.
A program for causing a computer that controls an inhaler device including a heater that heats an aerosol source and a temperature varying unit whose temperature is increased by heat produced by heating performed by the heater and whose temperature is decreased by inhalation of an aerosol generated from the aerosol source heated by the heater to:
changing a detection standard on a basis of an elapsed time from start of heating of the aerosol source by the heater; and

detecting inhalation of the aerosol in a case where a manner of a decrease in temperature of the temperature varying unit satisfies the detection standard.