# US 2021/0329971 A1 · Variable-frequency surface acoustic wave electronic cigarette

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- Number: US 2021/0329971 A1
- Document ID: US20210329971A1
- Status: Published application
- Kind: A1
- Application number: 17/270,452
- Filed: 2020-03-25
- Published: 2021-10-28
- Earliest claimed: 2020-02-26
- Assignees: China Tobacco Yunnan Industrial Co., Ltd
- Applicants: China Tobacco Yunnan Industrial Co., Ltd
- Inventors: Tinghua LI; Yulin LEI; Yi HAN; Jun WU; Yongkuan CHEN; Donglai ZHU; Hong HU; Jianguo TANG; Shoubo LI; Wei ZHAO; Xia ZHANG; Liu HONG; Xiaowei GONG; Xi LV
- Web page: https://patentgrep.com/patent/US20210329971A1

## CPC

- A24F 40/05: Devices without heating means
- A24F 40/10: Devices using liquid inhalable precursors
- A24F 40/44: Wicks
- A24F 40/46: Shape or structure of electric heating means
- A24F 40/48: Fluid transfer means, e.g. pumps
- A24F 40/60: Devices with integrated user interfaces
- A24F 40/90: Arrangements or methods specially adapted for charging batteries thereof
- B05B 17/0607: {generated by electrical means, e.g. piezoelectric transducers}
- B06B 1/0284: {with consecutive, i.e. sequential generation, e.g. with frequency sweep}
- B06B 3/00: Methods or apparatus specially adapted for transmitting mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B05B 17/0669: {Excitation frequencies}
- B06B 2201/55: Piezoelectric transducer
- B06B 2201/77: Atomizers
- A24F: SMOKERS' REQUISITES; MATCH BOXES; SIMULATED SMOKING DEVICES (inhaling appliances for medical purposes, shaped like cigars, cigarettes or pipes A61M15/06)
- B05B: SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES (spray-mixers with nozzles B01F25/72; processes for applying liquids or other fluent materials to surfaces by spraying B05D)
- B06B: METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, {e.g.} FOR PERFORMING MECHANICAL WORK IN GENERAL (for particular applications, see the relevant subclasses, e.g. B07B1/40, B23Q17/12, B24B31/06; measurement of mechanical vibrations G01H; in direction finding, locating, distance or velocity measuring G01S; {generating seismic energy G01V1/02}; control of mechanical vibrations in general G05D; sound-producing devices, e.g. bells, sirens, whistles G10K, {e.g. methods or devices for transmitting, conducting, or directing sound in general G10K11/00}; generation of electrical oscillations H03B; electromechanical resonators in general H03H; electromechanical transducers {for communication techniques, e.g. microphones, speakers} H04R)

## Abstract

A variable-frequency surface acoustic wave electronic cigarette includes an atomizer. An atomization cavity is disposed in the atomizer, and a variable-frequency surface acoustic wave atomization chip is disposed at a lower portion of the atomization cavity. An inverted trapezoidal interdigital transducer is disposed on the variable-frequency surface acoustic wave atomization chip. An e-liquid storage cavity is disposed in the atomization cavity. A porous ceramic sheet is disposed between the e-liquid storage cavity and the atomization chip. The new variable-frequency surface acoustic wave electronic cigarette can realize any adjustment of the working frequency within a set range, thereby realizing the autonomous regulation and control of a smoke particle size after atomization of the e-liquid.

## Claims

### Claim 1

A variable-frequency surface acoustic wave electronic cigarette, comprising an atomizer; wherein an atomization cavity is disposed in the atomizer, and a variable-frequency surface acoustic wave atomization chip is disposed at a lower portion of the atomization cavity; an inverted trapezoidal interdigital transducer is disposed on the variable-frequency surface acoustic wave atomization chip; an e-liquid storage cavity is disposed in the atomization cavity; and a porous ceramic sheet is disposed between the e-liquid storage cavity and the atomization chip;
wherein the inverted trapezoidal interdigital transducer comprises a plurality of metal interdigital electrodes and reflective electrodes, which are in an inverted trapezoidal shape; the inverted trapezoidal interdigital transducer further comprises two metal electrode bus bars, namely a first metal electrode bus bar and a second metal electrode bus bar; a plurality of first metal interdigital electrodes are connected to the first metal electrode bus bar through a relatively long trapezoidal bottom, and a plurality of second metal interdigital electrodes are connected to the second metal electrode bus bar through a relatively short trapezoidal bottom; the plurality of first metal interdigital electrodes and the plurality of second metal interdigital electrodes are arranged in a finger-crossed shape, and a reflective electrode is embedded between a first metal interdigital electrode and a second metal interdigital electrode.

### Claim 2

(canceled)

### Claim 3 (depends on 1)

The variable-frequency surface acoustic wave electronic cigarette of claim 1, wherein an arrangement manner of the metal interdigital electrodes and reflective electrodes is: the first metal interdigital electrode, a first gap, the second metal interdigital electrode, a second gap, the reflective electrode, a third gap, the first metal interdigital electrode, . . . ; the above arrangement continues in a plurality of groups to constitute the inverted trapezoidal interdigital transducer; an average width of the first gap is identical to an average width of the first metal interdigital electrode; an average width of the second gap is identical to an average width of the second metal interdigital electrode; and an average width of the third gap is identical to an average width of the reflective electrode.

### Claim 4 (depends on 3)

The variable-frequency surface acoustic wave electronic cigarette of claim 3, wherein a shape of the first metal interdigital electrode and a shape of the second metal interdigital electrode are identical; a sum of the average width of the first metal interdigital electrode, the average width of the first gap, the average width of the second metal interdigital electrode, the average width of the second gap, the average width of the reflective electrode and the average width of the third gap is a wavelength of the surface acoustic wave; it is satisfied that the average width of the first metal interdigital electrode, or the average width of the first gap, or the average width of the second metal interdigital electrode or the average width of the second gap is one eighth of the wavelength of the surface acoustic wave, and the average width of the third gap or the average width of the reflective electrode is a quarter of the wavelength of the surface acoustic wave.

### Claim 5 (depends on 1)

The variable-frequency surface acoustic wave electronic cigarette of claim 1, wherein the atomization chip successively comprises: a heat sink layer, a heat conduction layer and a piezoelectric substrate layer; the inverted trapezoidal interdigital transducer is disposed on the piezoelectric substrate layer; two separate printed circuit board (PCB) bonding pads, namely a first PCB bonding pad and a second PCB bonding pad, are disposed on the piezoelectric substrate layer; the first metal electrode bus bar is connected to the first PCB bonding pad through a power connection wire, and the second metal electrode bus bar is connected to the second PCB bonding pad through a power connection wire.

### Claim 6 (depends on 5)

The variable-frequency surface acoustic wave electronic cigarette of claim 5, further comprising an electric core; wherein a circuit board and a battery are disposed in the electric core, and the electric core is conductively connected to the first PCB bonding pad and the second PCB bonding pad through a magnetic thimble.

### Claim 7 (depends on 1)

The variable-frequency surface acoustic wave electronic cigarette of claim 1, wherein the atomizer is provided with an atomizer housing; an airflow channel is disposed inside the atomizer housing, and a suction nozzle is disposed outside the atomizer housing; the suction nozzle is in communication with and connected to the airflow channel; an airflow inlet is formed on the atomizer housing, and the airflow inlet and the inverted trapezoidal interdigital transducer are on an identical horizontal plane.

### Claim 8 (depends on 6)

The variable-frequency surface acoustic wave electronic cigarette of claim 6, further comprising a protective shell; wherein the electric core is disposed in the protective shell; and a button, an indicator light and a charging port are disposed outside the protective shell.