# US 10,477,896 B2 · Photodetector for measuring aerosol precursor composition in an aerosol delivery device

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- Number: US 10,477,896 B2
- Document ID: US10477896B2
- Status: Granted
- Kind: B2
- Application number: 15/291,771
- Filed: 2016-10-12
- Published: 2018-04-12
- Granted: 2019-11-19
- Earliest claimed: 2016-10-12
- Assignees: RAI Strategic Holdings, Inc.
- Applicants: Rai Strategic Holdings, Inc.
- Inventors: Rajesh Sur; Eric T. Hunt; Stephen B. Sears
- Web page: https://patentgrep.com/patent/US10477896B2

## CPC

- A24F 40/53: Monitoring, e.g. fault detection
- A24F 40/51: Arrangement of sensors
- F22B 1/284: {with water in reservoirs}
- G01F 23/292: Light {, e.g. infrared or ultraviolet}
- H05B 1/02: Automatic switching arrangements specially adapted to apparatus {; Control of heating devices} (thermally-actuated switches H01H37/00)
- A24F 40/10: Devices using liquid inhalable precursors
- A24F: SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES (inhaling appliances for medical purposes, shaped like cigars, cigarettes or pipes A61M15/06)
- F22B: METHODS OF STEAM GENERATION; STEAM BOILERS
- G01F: MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

An aerosol delivery device is provided that includes at least one housing enclosing a reservoir configured to retain an aerosol precursor composition, and a heating element controllable to activate and vaporize components of the aerosol precursor composition. The aerosol delivery device includes a light source configured to emit light into the reservoir, and a photodetector configured to detect a reflection of the light, and that indicates an amount of aerosol precursor composition retained in the reservoir. And the aerosol delivery device includes a control component coupled to the photodetector and configured to control operation of at least one functional element of the aerosol delivery device based on the reflection, and thereby the amount of aerosol precursor composition.

## Claims

### Claim 1

An aerosol delivery device comprising:
at least one housing enclosing a reservoir configured to retain an aerosol precursor composition;
a heating element controllable to activate and vaporize components of the aerosol precursor composition;
a light source configured to emit light into the reservoir;
a photodetector configured to detect a reflection of the light, wherein the reflection of the light indicates an amount of aerosol precursor composition retained in the reservoir;
a flow sensor configured to detect a flow of air through at least a portion of the at least one housing; and
a control component coupled to the photodetector and configured to control operation of at least one functional element of the aerosol delivery device based on the reflection so detected, and thereby the amount of aerosol precursor composition,
wherein the control component is configured to operate in an active mode to control the heating element to activate and vaporize components of the aerosol precursor composition only when both the flow of air is detected by the flow sensor, and the reflection of the light indicates at least a threshold amount of the aerosol precursor composition.

### Claim 2 (depends on 1)

The aerosol delivery device of claim 1, wherein the reflection of the light indicates the presence or absence of at least a threshold amount of aerosol precursor composition, and
wherein the control component being configured to control operation of the at least one functional element includes being configured to control operation of the at least one functional element based on the reflection so detected, and thereby the presence or absence of at least the threshold amount of aerosol precursor composition.

### Claim 3 (depends on 1)

The aerosol delivery device of claim 1, wherein the photodetector is a color sensor including a color pass filter and a photodetector for each of a plurality of colors, and the reflection of the light includes a component for each of the plurality of colors.

### Claim 4 (depends on 1)

The aerosol delivery device of claim 1, wherein the control component being configured to control operation of the at least one functional element includes being configured to control at the least one functional element to alter a locked state of the aerosol delivery device.

### Claim 5 (depends on 1)

The aerosol delivery device of claim 1, wherein the control component being configured to control operation of the at least one functional element includes being configured to control an indicator to provide a user-perceptible feedback that indicates the amount of aerosol precursor composition.

### Claim 6 (depends on 1)

The aerosol delivery device of claim 1, wherein the reflection of the light that indicates the amount of aerosol precursor composition also indicates an absorption characteristic of the aerosol precursor composition, and
wherein the control component is further configured to perform an authentication of the aerosol precursor composition based on a comparison of the absorption characteristic and a known absorption characteristic, and control operation of the at least one functional element further based on the authentication.

### Claim 7 (depends on 6)

The aerosol delivery device of claim 6, wherein the control component being configured to control operation of the at least one functional element further based on the authentication includes being configured to control at the least one functional element to alter a locked state of the aerosol delivery device.

### Claim 8 (depends on 1)

The aerosol delivery device of claim 1, wherein the reflection of the light that indicates the amount of aerosol precursor composition also indicates an absorption characteristic of the aerosol precursor composition, and
wherein the control component is further configured to date the aerosol precursor composition based on a comparison of the absorption characteristic and a known absorption characteristic range, and control operation of the at least one functional element further based on the date of the aerosol precursor composition.

### Claim 9 (depends on 8)

The aerosol delivery device of claim 8, wherein the control component being configured to control operation of the at least one functional element includes being configured to control an indicator to provide a user-perceptible feedback that indicates the date of the aerosol precursor composition.

### Claim 10 (depends on 1)

The aerosol delivery device of claim 1, wherein the aerosol precursor composition comprises glycerin and nicotine.

### Claim 11

A cartridge coupled or coupleable with a control body that is equipped with a control component, the control body being coupled or coupleable with the cartridge to form an aerosol delivery device, the cartridge comprising:
at least one housing enclosing a reservoir configured to retain an aerosol precursor composition;
a heating element controllable to activate and vaporize components of the aerosol precursor composition;
a light source configured to emit light into the reservoir; and
a photodetector configured to detect a reflection of the light, wherein the reflection of the light indicates an amount of aerosol precursor composition retained in the reservoir,
wherein the control component is coupled to the photodetector when the control body is coupled with the cartridge, the control component being configured to control operation of at least one functional element of the aerosol delivery device based on the reflection so detected, and thereby the amount of aerosol precursor composition, and
wherein the control component is further configured to operate in an active mode to control the heating element to activate and vaporize components of the aerosol precursor composition only when both a flow of air is detected by a flow sensor, and the reflection of the light indicates at least a threshold amount of the aerosol precursor composition.

### Claim 12 (depends on 11)

The cartridge of claim 11, wherein the reflection of the light indicates the presence or absence of at least a threshold amount of aerosol precursor composition, and
wherein the control component being configured to control operation of the at least one functional element includes being configured to control operation of the at least one functional element based on the reflection, and thereby the presence or absence of at least the threshold amount of aerosol precursor composition.

### Claim 13 (depends on 11)

The cartridge of claim 11, wherein the photodetector is a color sensor including a color pass filter and a photodetector for each of a plurality of colors, and the reflection of the light includes a component for each of the plurality of colors.

### Claim 14 (depends on 11)

The cartridge of claim 11, wherein the aerosol precursor composition comprises glycerin and nicotine.

### Claim 15

A control body coupled or coupleable with a cartridge to form an aerosol delivery device, the cartridge including a reservoir configured to retain an aerosol precursor composition, a heating element controllable to activate and vaporize components of the aerosol precursor composition, a light source configured to emit light into the reservoir, and a photodetector configured to detect a reflection of the light, wherein the reflection of the light indicates an amount of aerosol precursor composition retained in the reservoir, the control body comprising:
a housing; and within the housing,
a flow sensor configured to detect a flow of air through at least a portion of the housing, and
a control component coupled to the photodetector when the control body is coupled with the cartridge, the control component being configured to control operation of at least one functional element of the aerosol delivery device based on the reflection so detected, and thereby the amount of aerosol precursor composition,
wherein the control component is configured to operate in an active mode to control the heating element to activate and vaporize components of the aerosol precursor composition only when both the flow of air is detected by the flow sensor, and the reflection of the light indicates at least a threshold amount of the aerosol precursor composition.

### Claim 16 (depends on 15)

The control body of claim 15, wherein the reflection of the light indicates the presence or absence of at least a threshold amount of aerosol precursor composition, and
wherein the control component being configured to control operation of the at least one functional element includes being configured to control operation of the at least one functional element based on the reflection, and thereby the presence or absence of at least the threshold amount of aerosol precursor composition.

### Claim 17 (depends on 15)

The control body of claim 15, wherein the control component being configured to control operation of the at least one functional element includes being configured to control at the least one functional element to alter a locked state of the aerosol delivery device.

### Claim 18 (depends on 15)

The control body of claim 15, wherein the control component being configured to control operation of the at least one functional element includes being configured to control an indicator to provide a user-perceptible feedback that indicates the amount of aerosol precursor composition.

### Claim 19 (depends on 15)

The control body of claim 15, wherein the reflection of the light that indicates the amount of aerosol precursor composition also indicates an absorption characteristic of the aerosol precursor composition, and
wherein the control component is further configured to perform an authentication of the aerosol precursor composition based on a comparison of the absorption characteristic and a known absorption characteristic, and control operation of the at least one functional element further based on the authentication.

### Claim 20 (depends on 19)

The control body of claim 19, wherein the control component being configured to control operation of the at least one functional element further based on the authentication includes being configured to control at the least one functional element to alter a locked state of the aerosol delivery device.

### Claim 21 (depends on 15)

The control body of claim 15, wherein the reflection of the light that indicates the amount of aerosol precursor composition also indicates an absorption characteristic of the aerosol precursor composition, and
wherein the control component is further configured to date the aerosol precursor composition based on a comparison of the absorption characteristic and a known absorption characteristic range, and control operation of the at least one functional element further based on the date of the aerosol precursor composition.

### Claim 22 (depends on 21)

The control body of claim 21, wherein the control component being configured to control operation of the at least one functional element includes being configured to control an indicator to provide a user-perceptible feedback that indicates the date of the aerosol precursor composition.

### Claim 23

An aerosol delivery device comprising:
at least one housing enclosing a reservoir configured to retain an aerosol precursor composition;
an atomizer controllable to activate and to produce an aerosol from the aerosol precursor composition;
a light source configured to emit light into the reservoir;
a photodetector configured to detect a reflection of the light, wherein the reflection of the light indicates an amount of aerosol precursor composition retained in the reservoir;
a flow sensor configured to detect a flow of air through at least a portion of the at least one housing; and
a control component coupled to the photodetector and configured to control operation of at least one functional element of the aerosol delivery device based on the reflection so detected, and thereby the amount of aerosol precursor composition,
wherein the control component is configured to operate in an active mode to control the atomizer to activate and to produce an aerosol from the aerosol precursor composition only when both the flow of air is detected by the flow sensor, and the reflection of the light indicates at least a threshold amount of the aerosol precursor composition.

### Claim 24 (depends on 23)

The aerosol delivery device of claim 23, wherein the reflection of the light indicates the presence or absence of at least a threshold amount of aerosol precursor composition, and
wherein the control component being configured to control operation of the at least one functional element includes being configured to control operation of the at least one functional element based on the reflection so detected, and thereby the presence or absence of at least the threshold amount of aerosol precursor composition.

### Claim 25 (depends on 23)

The aerosol delivery device of claim 23, wherein the photodetector is a color sensor including a color pass filter and a photodetector for each of a plurality of colors, and the reflection of the light includes a component for each of the plurality of colors.

### Claim 26 (depends on 23)

The aerosol delivery device of claim 23, wherein the atomizer comprises a heating element.