Electrode device, pressure sensor and pressure meter

• US 8,763,468 B2
• Filed: 09/30/2011
• Issued: 07/01/2014
• Est. Priority Date: 09/30/2010
• Status: Active Grant

• Current Assignee: Shenzhen Kingyield Technology Co., Ltd.
• Original Assignee: Shenzhen Kingyield Technology Co., Ltd.
• Inventors: Zhang, Nianping
• Primary Examiner(s): ALLEN, ANDRE J
• Application Number:
  US13/249,552
• Publication Number:
  US 20120079885A1
• Time in Patent Office: 1,005 Days
• Field of Search: None
• US Class Current: 73/724
• CPC Class Codes: A61B 2562/0214 Capacitive electrodes
• CPC Class Codes: A61B 2562/0247 Pressure sensors
• CPC Class Codes: A61B 5/021 Measuring pressure in heart or blood vessels A61B5/0205 takes precedence
• CPC Class Codes: G01L 19/148 Details about the circuit board integration, e.g. integrated with the diaphragm surface or encapsulation
• CPC Class Codes: G01L 9/0044 Constructional details of non-semiconductive diaphragms
• CPC Class Codes: G01L 9/0072 using variations in capacitance
• CPC Class Codes: H01G 5/16 using variation of distance between electrodes
• CPC Class Codes: Y10T 29/49117 Conductor or circuit manufacturing

Abstract

Provided are an electrode device, a pressure sensor and an electronic pressure meter. The electrode device may comprise: an electrode portion; and an elastically deformable portion arranged on a radial peripheral of the electrode portion. The electrode portion is integrated with the elastically deformable portion such that when a force is applied to the electrode device, the elastically deformable portion can be deformed correspondingly and the electrode portion can be displaced axially.

Claims

1. A pressure sensing device, comprising:

a base;

an air nozzle arranged on the base; and

an electrode device,

wherein the electrode device comprises an electrode portion; and

an elastically deformable portion arranged on a radial peripheral of the electrode portion,

wherein the electrode portion is integrated with the elastically deformable portion such that when a force is applied to the electrode device, the elastically deformable portion is deformed correspondingly and the electrode portion is displaced axially, and

wherein the electrode device is hermetically fixed to the base, such that an air chamber that can accommodate air is formed between the electrode device and the base, and the air chamber is communicated with the air nozzle.

2. The pressure sensing device of claim 1, wherein a thickness of the electrode portion is designed such that there is no deformation on the electrode portion or the deformation of the electrode portion is within an allowed range when a force applied to the electrode device is less than a preset value.

3. The pressure sensing device of claim 1, wherein a cross-section of the elastically deformable portion has a curve shape, a zigzag shape, or a step shape.

4. The pressure sensing device of claim 3, wherein a thickness of the elastically deformable portion is less than a thickness of the electrode portion, and the elastically deformable portion is formed using stamping a portion to be processed to reduce a thickness of the portion to be processed.

5. An electrostatic capacity type pressure sensor, comprising:

a fixed electrode; and

a pressure sensing device,

wherein the pressure sensing device comprises a base;

an air nozzle arranged on the base; and

an electrode device,

wherein the electrode device comprises an electrode portion; and

an elastically deformable portion arranged on a radial peripheral of the electrode portion,

wherein the electrode portion is integrated with the elastically deformable portion such that when a force is applied to the moveable electrode device, the elastically deformable portion is deformed correspondingly and the electrode portion is displaced axially,

wherein the electrode device is hermetically fixed to the base, such that an air chamber that can accommodate air is formed between the electrode device and the base, and

wherein one side of the electrode portion is arranged to be parallel to the fixed electrode, and the other side of the electrode portion, the elastically deformable portion and the base form the air chamber;

wherein the air chamber is communicated with the air nozzle.

6. The electrostatic capacity type pressure sensor of claim 5, wherein a thickness of the electrode portion is designed such that there is no deformation on the electrode portion or the deformation of the electrode portion is within an allowed range when a force applied to the electrode device is less than a preset value.

7. The electrostatic capacity type pressure sensor of claim 5, wherein a cross-section of the elastically deformable portion has a shape of curve type, zigzag type, or step type.

8. The electrostatic capacity type pressure sensor of claim 5, wherein the air nozzle is extending integrally from a middle part of the base.

9. The electrostatic capacity type pressure sensor of claim 5, wherein the electrode device is further provided with a fixing portion located on a radial peripheral of the elastically deformable portion, and the electrode device is hermetically fixed to the base through the fixing portion.

10. An electronic pressure meter, comprising:

an electrostatic capacity type pressure sensor; and

a microprocessor,

wherein the electrostatic capacity type pressure sensor comprises;

a fixed electrode; and

a pressure sensing device,

wherein the pressure sensing device comprises;

a base;

an air nozzle arranged on the base; and

an electrode device,

wherein the electrode device comprises;

an electrode portion; and

an elastically deformable portion arranged on a radial peripheral of the electrode portion, wherein the electrode portion is integrated with the elastically deformable portion such that when a force is applied to the electrode device, the elastically deformable portion is deformed correspondingly and the electrode portion is displaced axially,

wherein the electrode device is hermetically fixed to the base, such that an air chamber that can accommodate air is formed between the electrode device and the base,

wherein one side of the electrode portion is arranged to be parallel to the fixed electrode, and the other side of the electrode portion, the elastically deformable portion and the base form the air chamber,

wherein the air chamber is communicated with the air nozzle, and

wherein electrostatic capacity signals between the electrode portion and the fixed electrode are input to the microprocessor.

11. The electronic pressure meter of claim 10, wherein a thickness of the electrode portion is designed such that there is no deformation on the electrode portion or the deformation of the electrode portion is within an allowed range when a force applied to the electrode portion is less than a preset value.

12. The electronic pressure meter of claim 10, wherein the electrode device is further provided with a fixing portion located on a radial peripheral of the elastically deformable portion, and the electrode device is hermetically fixed to the base through the fixing portion.

13. A method for manufacturing an electrostatic capacity type pressure sensor, comprising:

forming an air nozzle extending outwardly from the base in order to form an incorporate base assembly;

retaining an area with a desired shape on an electrode plate to form an electrode portion;

forming an elastically deformable portion by processing the electrode plate at a radial peripheral of the formed electrode portion, such that when a force is applied to the electrode plate, the elastically deformable portion is deformed correspondingly and the electrode portion is displaced axially;

hermetically fixing the electrode portion to the base through the elastically deformable portion, and forming an air chamber that can accommodate air through the electrode portion, the elastically deformable portion and the base;

manufacturing a fixed electrode with a desired shape;

aligning the electrode portion with the fixed electrode to fix them together in a parallel manner, such that when a pressure of air entering into the air chamber from the air nozzle is changed, a distance between the electrode portion and the fixed electrode can be changed due to a deformation of the elastically deformable portion, such that an electrostatic capacity of the pressure sensor can be changed.

14. The method of claim 13, wherein the forming an elastically deformable portion comprises:

using stamping technique to thin a portion to be processed, wherein the elastically deformable portion has a cross-section of curve shape, corrugated shape, zigzag shape, or step shape or a mixed thereof.