Extended heater and heating assembly for an aerosol generating system

• US 10,638,794 B2
• Filed: 03/22/2016
• Issued: 05/05/2020
• Est. Priority Date: 03/31/2015
• Status: Active Grant

• Current Assignee: Philip Morris Products SA (Philip Morris Limited)
• Original Assignee: Philip Morris Products SA (Philip Morris Limited)
• Inventors: Mahler, Boris, Minzoni, Mirko, Plojoux, Julien
• Primary Examiner(s): Cordray, Dennis R
• Application Number:
  US15/553,216
• Publication Number:
  US 20180235278A1
• Time in Patent Office: 1,505 Days
• Field of Search: None
• CPC Class Codes: A24F 40/20 Devices using solid inhalable precursors
• CPC Class Codes: A24F 40/40 Constructional details, e.g. connection of cartridges and battery parts
• CPC Class Codes: A24F 40/46 Shape or structure of electric heating means
• CPC Class Codes: A61M 11/042 electrical
• CPC Class Codes: F22B 1/284 with water in reservoirs

Abstract

A heating assembly for heating an aerosol-forming substrate is provided, including a heater including an electrically resistive heating element and a heater substrate; and a heater mount coupled to the heater, the heating element including a first portion and a second portion configured such that, when an electrical current is passed through the heating element, the first portion is heated to a higher temperature than that of the second portion, the first portion of the heating element being disposed on a heating area of the heater substrate and the second portion of the heating element being disposed on a holding area of the heater substrate, the heater mount being fixed to the holding area of the heater substrate, and the second portion of the heating element being longer than the first portion of the heating element.

Claims

1. A heating assembly for heating an aerosol-forming substrate, comprising:

a heater comprising an electrically resistive heating element and a heater substrate; and

a heater mount coupled to the heater,

wherein the electrically resistive heating element comprises a first portion and a second portion configured such that, when an electrical current is passed through the heating element, the first portion is heated to a higher temperature than that of the second portion,

wherein the first portion of the electrically resistive heating element is disposed on a heating area of the heater substrate and the second portion of the electrically resistive heating element is disposed on a holding area of the heater substrate,

wherein the heater mount is fixed to the holding area of the heater substrate,

wherein the second portion of the electrically resistive heating element is longer than the first portion of the electrically resistive heating element, and

wherein the second portion of the electrically resistive heating element has a length of between 12 mm and 20 mm.

2. The heating assembly according to claim 1, wherein the first portion of the electrically resistive heating element has a length of between 8 mm and 12 mm.

3. The heating assembly according to claim 1,

wherein the second portion of the electrically resistive heating element extends along 13.9 mm of a length of the heater plus or minus 0.5 mm, and

wherein the first portion of the electrically resistive heating element extends along 10.5 mm of the length of the heater plus or minus 0.5 mm.

4. The heating assembly according to claim 1, wherein the heater mount comprises a moldable polymeric material.

5. The heating assembly according to claim 1,

wherein the first portion of the electrically resistive heating element is formed from a first material and the second portion of the electrically resistive heating element is formed from a second material, and

wherein the first material has a greater electrical resistivity coefficient than that of the second material.

6. The heating assembly according to claim 1,

wherein the electrically resistive heating element further comprises a third portion configured for electrical connection to a power supply, and

wherein the third portion is disposed on an opposite side of the heater mount to the first portion of the electrically resistive heating element.

7. The heating assembly according to claim 1, wherein at least a portion of the heater mount extends along the holding area and tapers inward in a direction towards the heating portion.

8. The heating assembly according to claim 1, wherein at least a portion of the heater mount extends along the holding area for greater than 50% of a length of the holding area.

9. The heating assembly according to claim 1, wherein at least a portion of the heater mount is cone-shaped.

10. An aerosol-generating device, comprising:

a housing;

a heating assembly, comprising;

a heater comprising an electrically resistive heating element and a heater substrate, and

a heater mount coupled to the housing,

wherein the electrically resistive heating element comprises a first portion and a second portion configured such that, when an electrical current is passed through the heating element, the first portion is heated to a higher temperature than that of the second portion,

wherein the first portion of the electrically resistive heating element is disposed on a heating area of the heater substrate and the second portion of the electrically resistive heating element is disposed on a holding area of the heater substrate,

wherein the heater mount is fixed to the holding area of the heater substrate,

wherein the second portion of the electrically resistive heating element is longer than the first portion of the electrically resistive heating element, and

wherein the second portion of the electrically resistive heating element has a length of between 12 mm and 20 mm;

an electrical power supply connected to the electrically resistive heating element; and

a control element configured to control a supply of power from the electrical power supply to the electrically resistive heating element.

11. The aerosol-generating device according to claim 10, wherein the housing defines a cavity surrounding the first portion of the electrically resistive heating element, the cavity being configured to receive an aerosol-forming article containing an aerosol-forming substrate.

12. An aerosol-generating system, comprising:

an aerosol-generating device, comprising;

a housing;

a heating assembly, comprising;

a heater comprising an electrically resistive heating element and a heater substrate, and

a heater mount coupled to the housing,

wherein the electrically resistive heating element comprises a first portion and a second portion configured such that, when an electrical current is passed through the heating element, the first portion is heated to a higher temperature than that of the second portion,

wherein the first portion of the electrically resistive heating element is disposed on a heating area of the heater substrate and the second portion of the electrically resistive heating element is disposed on a holding area of the heater substrate,

wherein the heater mount is fixed to the holding area of the heater substrate,

wherein the second portion of the electrically resistive heating element is longer than the first portion of the electrically resistive heating element, and

wherein the second portion of the electrically resistive heating element has a length of between 12 mm and 20 mm;

an electrical power supply connected to the electrically resistive heating element; and

a control element configured to control a supply of power from the electrical power supply to the electrically resistive heating element; and

a heated aerosol-generating article comprising a plurality of components including an aerosol-forming substrate assembled within a wrapper forming a rod having a mouth end and a distal end upstream from the mouth end, wherein a hollow tube having an external diameter of between 5 mm and 15 mm and a length of between 5 mm and 15 mm is disposed upstream from the aerosol-forming substrate within the wrapper, the heater of the aerosol-generating device extending through the hollow tube and penetrating the aerosol-forming substrate when the heated aerosol-generating article is engaged with the aerosol-generating device.

13. The aerosol-generating system according to claim 12, wherein the aerosol-generating article further comprises an aerosol-cooling element and a mouthpiece filter disposed downstream of the aerosol-forming substrate.