SENSOR

• US 20190331623A1
• Filed: 12/20/2017
• Published: 10/31/2019
• Est. Priority Date: 01/11/2017
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Hyunchul, LEE, Myungwon
• Granted Patent: US 10,996,181 B2
• Time in Patent Office: Days
• CPC Class Codes: B41F 13/11 Gravure cylinders attaching cylindrical formes B41F27/105
• CPC Class Codes: B41F 15/06 with auxiliary equipment, e.g. for drying printed articles
• CPC Class Codes: B41F 15/0881 for printing on polyhedral articles
• CPC Class Codes: B41F 19/001 with means for coating or laminating
• CPC Class Codes: B41F 19/005 with means for applying metallic, conductive or chargeable material
• CPC Class Codes: B41F 9/00 Rotary intaglio printing presses
• CPC Class Codes: B41F 9/01 for indirect printing B41F9/02 takes precedence
• CPC Class Codes: B41M 1/10 Intaglio printing ; Gravure printing
• CPC Class Codes: B41M 1/12 Stencil printing; Silk-screen printing
• CPC Class Codes: B41M 3/00 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 Class Codes: G01N 27/02 by investigating impedance
• CPC Class Codes: G01N 27/12 of a solid body in dependence upon absorption of a fluid; of a solid body in dependence upon reaction with a fluid , for detecting components in the fluid
• CPC Class Codes: G01N 33/03 Edible oils or edible fats
• CPC Class Codes: H01Q 1/22 by structural association with other equipment or articles
• CPC Class Codes: H01Q 1/368 using carbon or carbon composite
• CPC Class Codes: H01Q 1/38 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

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.

Claims

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.

2. The sensor of claim 1, 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.

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

4. The sensor of claim 2, wherein the conductive particles of the coating electrode include a carbon nano tube (CNT).

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

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

7. The sensor of claim 2, 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.

8. The sensor of claim 2, wherein the conductive particles are configured by combination of a flake or spherical shape.

9. 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.

10. 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 μ

m, and a thickness of the coating electrode from an upper end of the sensing electrode is 10 μ

m.

11. 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 μ

m or more and 3000 μ

m or less.

12. The sensor of claim 10, wherein the antenna pattern, the sensing electrode and the circuit line have a thickness of 0.5 μ

m or more and 15 μ

m or less.

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

14. The sensor of claim 1, wherein the antenna pattern has a width of 500 μ

m or more and 1500 μ

m or less, and an adjacent distance of the antenna pattern is 300 μ

m or more and 700 μ

m or less.

15. 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.

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

17. 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.

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

19. A manufacturing method of a sensor, comprising:

a first printing step of printing, on a non-conductive substrate, a sensing electrode connected with the antenna pattern through an antenna pattern for transmitting or receiving a radio signal to or from an external device and a circuit line, sensing an impedance change due to a contact of a sensing target material; and

a second printing step of printing a coating electrode for removing occurrence of a noise of the impedance change on an outer side of the sensing electrode; and

a drying step of heat drying the printed antenna pattern, sensing electrode and coating electrode.

20. The manufacturing method of claim 19, 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.