# US 11,998,052 B2 · Shielding of an induction coil within an aerosol generating device

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- Number: US 11,998,052 B2
- Document ID: US11998052B2
- Status: Granted
- Kind: B2
- Application number: 16/978,090
- Filed: 2020-05-19
- Published: 2023-04-13
- Granted: 2024-06-04
- Earliest claimed: 2019-06-11
- Assignees: Kt&G Corporation
- Applicants: Kt&G Corporation
- Inventors: Jae Min Lee; Sang Kyu Park; Hwi Kyeong An; Seung Won Lee; Soung Ho Ju
- Web page: https://patentgrep.com/patent/US11998052B2

## CPC

- A24F 40/465: specially adapted for induction heating
- A24F 40/20: Devices using solid inhalable precursors
- H05B 6/105: {using a susceptor}
- H05B 6/108: {for heating a fluid}
- H05B 6/36: Coil arrangements
- A24F: SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES (inhaling appliances for medical purposes, shaped like cigars, cigarettes or pipes A61M15/06)
- H05B: ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL

## Abstract

An aerosol generating device includes an accommodation space in a cylindrical shape for accommodating a cigarette, an induction coil wound along an outer surface of the accommodation space, a power supply for supplying electric power to the induction coil, a controller for controlling electric power supplied to the induction coil, and a shield film including a ferromagnetic material for shielding electromagnetic interference from electromagnetic waves emitted from the induction coil. The shield film surrounds only a portion of an outer surface of the induction coil to shield the electromagnetic interference from the electromagnetic waves having a frequency that does not exceed 500 kHz.

## Claims

### Claim 1

An aerosol generating device comprising:
an accommodation space having a cylindrical shape and configured to accommodate a cigarette;
an induction coil wound to conform within and exposed to the accommodation space;
a power supply configured to supply electric power to the induction coil;
a controller configured to control electric power supplied to the induction coil; and
a shield film including a ferromagnetic material that blocks electromagnetic interference (EMI) from electromagnetic waves emitted from the induction coil, and arranged to surround only a portion of an outer surface of the induction coil to shield the EMI from the electromagnetic waves having a frequency that does not exceed 500 kHz,
wherein the remaining portions of the outer surface of the induction coil are also exposed within the accommodation space.

### Claim 2 (depends on 1)

The aerosol generating device of claim 1, wherein
the shield film comprises a plurality of film segments, and
the plurality of film segments surround the portion of the outer surface of the induction coil by partially surrounding the outer surface of the induction coil along a circumferential direction of the outer surface of the induction coil.

### Claim 3 (depends on 1)

The aerosol generating device of claim 1, wherein the shield film has a mesh structure that surrounds the portion of the outer surface of the induction coil.

### Claim 4 (depends on 1)

The aerosol generating device of claim 1, wherein the shield film surrounds 50% or more and 95% or less of the outer surface of the induction coil.

### Claim 5 (depends on 1)

The aerosol generating device of claim 1, further comprising
an additional film including a nonferrous metal for additionally blocking the EMI from the electromagnetic waves emitted from the induction coil,
wherein the additional film surrounds at least a portion of an outer surface of the shield film.

### Claim 6 (depends on 1)

The aerosol generating device of claim 1, wherein the shield film further comprises a nonferrous metal for additionally blocking the EMI from the electromagnetic waves emitted from the induction coil.

### Claim 7 (depends on 1)

The aerosol generating device of claim 1, wherein the shield film is spaced apart from the induction coil by 0.5 mm or more and 3 mm or less.

### Claim 8 (depends on 1)

The aerosol generating device of claim 1, wherein the shield film has a thickness of 0.2 mm or more and 2 mm or less.

### Claim 9 (depends on 1)

The aerosol generating device of claim 1, wherein the controller controls a frequency of an alternating current supplied to the induction coil not to exceed 500 kHz.