Sensor

Patent metadata

Field	Value
Publication number	US-10996181-B2
Application number	US-201716473212-A
Country	US
Kind code	B2
Filing date	Dec 20, 2017
Priority date	Jan 11, 2017
Publication date	May 4, 2021
Grant date	May 4, 2021

Abstract

Provided is a sensor comprising a non-conductive substrate; and a conductive layer electronically printed on one side of the substrate, wherein the conductive layer comprises: an antenna pattern for transmitting and receiving a radio signal with an external device; a sensing electrode connected to the antenna pattern via a circular wiring for sensing an impedance change due to contact with a sensing target material; and a coating electrode stacked on the sensing electrode for removing an occurrence of noise of the impedance change. Accordingly, the present invention solves the problem of a sensor, in the form of a terminal, not being compact and the problem of high manufacturing costs and low manufacturing quality of a sensor manufactured using a deposition method in order to replace such sensor with a sensor manufactured by a printing method, and solves a corrosion problem of a sensing electrode, a durability problem, etc. that may occur in the sensor of the printing method.

First claim

The invention claimed is:

1. A sensor comprising:
a non-conductive substrate; and
a conductive layer electronically printed on one surface of the substrate,
wherein the conductive layer includes:
an antenna pattern for transmitting or receiving a radio signal to or from an external device;
a sensing electrode connected to the antenna pattern through a circuit line, for sensing an impedance change due to a contact with a sensing target material; and
a coating electrode deposited on the sensing electrode, for removing an occurrence of noise of the impedance change, and

wherein each of the sensing electrode and the coating electrode includes:
a plurality of conductive particles forming a gap; and
a binder having the plurality of conductive particles to fill the gap.

2. The sensor of claim 1 , wherein the conductive particles of the sensing electrode include Ag.

3. The sensor of claim 1 , wherein the conductive particles of the coating electrode include a carbon nano tube (CNT).

4. The sensor of claim 3 , wherein the conductive particles of the coating electrode further include a Graphite and a carbon black.

5. The sensor of claim 4 , wherein the graphite and the carbon black are configured at 10% or less of a total mass of the coating electrode.

6. The sensor of claim 1 , wherein the binder includes one of a Polyethylene oxide (PEO) based resin, an Oleic acid based resin, an Acrylate based resin, an Acetate based resin and an Epoxy based resin.

7. The sensor of claim 1 , wherein the conductive particles are configured by combination of a flake or spherical shape.

8. The sensor of claim 1 , wherein the antenna pattern, the circuit line and the sensing electrode are made of the same material, provided on the same layer, and the coating electrode is provided by being deposited on the sensing electrode.

9. The sensor of claim 1 , wherein the sensing electrode includes two electrodes spaced apart from each other, the coating electrode includes a first area and a second area, which respectively cover the spaced electrodes, and a minimum distance between the first area and the second area is 10 μm, and a thickness of the coating electrode from an upper end of the sensing electrode is 10 μm.

10. The sensor of claim 1 , wherein the sensing electrode includes two electrodes spaced apart from each other, and an interval between the two electrodes is 30 μm or more and 3000 μm or less.

11. The sensor of claim 9 , wherein the antenna pattern, the sensing electrode and the circuit line have a thickness of 0.5 μm or more and 15 μm or less.

12. The sensor of claim 1 , wherein the substrate includes any one of polyethylene erephthalate (PET), polyimide (PI), polystyrene (PS) and polyethylene naphthalate (PEN).

13. The sensor of claim 1 , wherein the antenna pattern has a width of 500 μm or more and 1500 μm or less, and an adjacent distance of the antenna pattern is 300 μm or more and 700 μm or less.

14. The sensor of claim 1 , further comprising a passivation layer forming an opening, which exposes at least one area of the sensing electrode, having a surface energy greater than that of the substrate.

15. The sensor of claim 14 , further comprising a protective layer deposited on the substrate, protecting the conductive layer and the passivation layer.

16. The sensor of claim 1 , wherein the conductive layer includes a conjugate polymer layer containing a conductive polymer provided by being patterned or absorbed in the sensing electrode.

17. The sensor of claim 1 , wherein the sensing electrode is pressed through a rolling process.

18. A manufacturing method of a sensor, comprising:
a first printing step of printing, on a non-conductive substrate, a sensing electrode connected with an antenna pattern through a circuit line for transmitting or receiving a radio signal to or from an external device and sensing an impedance change due to a contact of a sensing target material;
a second printing step of printing a coating electrode on an outer side of the sensing electrode, for removing occurrence of a noise of the impedance change; and
a drying step of heat drying the printed antenna pattern, sensing electrode and coating electrode,
wherein each of the sensing electrode and the coating electrode includes:
a plurality of conductive particles forming a gap; and
a binder having the plurality of conductive particles to fill the gap.

19. The manufacturing method of claim 18 , wherein the first printing step and the second printing step are performed by any one of a Gravure offset process, a Gravure printing process and a Screen printing process.

Assignees

• Lg Electronics Inc

Inventors

• Kim Hyunchul
• Lee Myungwon

Classifications

• H01Q1/2208

  associated with components used in interrogation type services, i.e. in systems for information exchange between an interrogator/reader and a tag/transponder, e.g. in Radio Frequency Identification [RFID] systems (methods or arrangements for sensing record carriers, e.g. for reading patterns G06K7/00; record carrier for use with machines and with at least a part designed to carry digital markings G06K19/00) · CPC title

• G01N27/125 Primary

  Composition of the body, e.g. the composition of its sensitive layer · CPC title

• H01Q1/38

  formed by a conductive layer on an insulating support {(patch antennas H01Q9/0407; microstrip dipole antennas H01Q9/065; microstrip slot antennas H01Q13/106; transmission line microstrip antennas H01Q13/206; manufacturing reflecting surfaces using insulating material for supporting the reflecting surface  H01Q15/142)} · CPC title

• B41M3/00

  Printing processes to produce particular kinds of printed work, e.g. patterns ({printing apparatus or machines of special type or for particular purposes B41F17/00;} special designs or pictures per se B44F; manufacturing printed circuits using printing techniques H05K3/12 {; manufacturing organic semiconductor devices using printing techniques H10K71/13}) · CPC title

• B41F13/11

  Gravure cylinders {(attaching cylindrical formes B41F27/105)} · CPC title