# US 11,309,159 B2 · Structure of emitter electrode for enhancing ion currents

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- Number: US 11,309,159 B2
- Document ID: US11309159B2
- Status: Granted
- Kind: B2
- Application number: 17/408,763
- Filed: 2021-08-23
- Published: 2022-03-03
- Granted: 2022-04-19
- Earliest claimed: 2020-08-25
- Assignees: Ales Tech Inc.
- Applicants: Ales Tech Inc.
- Inventors: Wei-Chaio Lai; Chun-Yueh Lin; Ing-Shouh Hwang; Wei-Tse Chang; Ching-Yu Hsiao; Yu-Fong Yu; Zong-Yu Yang
- Web page: https://patentgrep.com/patent/US11309159B2

## CPC

- H01J 1/02: Main electrodes
- H01J 1/3044: {Point emitters}
- H01J 2237/0807: Gas field ion sources [GFIS]
- H01J: ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS (spark-gaps H01T; electric arc lamps H05B31/00; particle accelerators H05H)

## Abstract

The present invention discloses a structure of an emitter electrode for enhancing ion currents, including a tip end part and a shank part. The tip end part has a pinpoint, a first diameter, and a radius of curvature. A length of the tip end part with the shank part is from the pinpoint to a first position of the shank part and a distance between the first position and the pinpoint is 300 times the first diameter. The radius of curvature of the tip end part ranges from 50 nanometers to 5 micrometers. The first diameter is 2 times the radius of curvature.

## Claims

### Claim 1

A structure of an emitter electrode for enhancing ion currents, comprising:
a tip end part, formed at a front end of the structure of the emitter electrode, having a pinpoint, a first diameter, and a radius of curvature; and
a shank part, formed in a rear of the tip end part at the front end of the structure of the emitter electrode;
wherein a length of the tip end part with the shank part is from the pinpoint to a first position of the shank part, and a first distance between the first position and the pinpoint is 300 times of the first diameter;
wherein the radius of curvature of the tip end part ranges from 50 nanometers to 5 micrometers;
wherein the first diameter is 2 times of the radius of curvature.

### Claim 2 (depends on 1)

The structure as claimed in claim 1, wherein there is at least one first node position between a second position and a third position of the shank part and a second diameter corresponding to the at least one first node position is less than 1.2 times of the first diameter;
wherein a second distance between the pinpoint and the second position is 3 times of the first diameter and a third distance between the pinpoint and the third position is 60 times of the first diameter.

### Claim 3 (depends on 2)

The structure as claimed in claim 2, wherein a third diameter of the shank part between the pinpoint and the second position is less than 1.2 times of the first diameter.

### Claim 4 (depends on 1)

The structure as claimed in claim 1, wherein there is at least one second node position between a fourth position and the first position of the shank part and a fourth diameter corresponding to the at least one second node position is less than 2 times of the first diameter;
wherein a fourth distance between the pinpoint and the fourth position is 18 times of the first diameter.

### Claim 5 (depends on 4)

The structure as claimed in claim 4, wherein a fifth diameter of the shank part between the pinpoint and the fourth position is less than 2 times of the first diameter.