Sheet type electrode

• US 4,816,132 A
• Filed: 11/24/1987
• Issued: 03/28/1989
• Est. Priority Date: 11/27/1986
• Status: Expired due to Fees

• Current Assignee: Horiba Limited
• Original Assignee: Horiba Limited
• Inventors: Tomita, Katsuhiko, Kotani, Haruo, Yada, Takaaki, Nakanishi, Tsuyoshi
• Primary Examiner(s): NOT, DEFINED
• Application Number:
  US07/124,567
• Time in Patent Office: 490 Days
• Field of Search: 204/420, 204/414, 204/435, 204/408
• US Class Current: 204/408
• CPC Class Codes: G01N 27/36 Glass electrodes

Abstract

A flat shaped composite electrode includes a flat substrate having a high electrical insulating property. A flat inside pair of electrodes and a flat outside pair of electrodes are fixed on the substrate. A flat support layer having a high electrical insulating property overlays the electrodes and substrate. The support layer describes two holes into which a gelatinized internal solution is placed. An ion response glass membrane is mounted on the support layer and over one hole, while a liquid junction membrane is similarly mounted over the other hole.

Claims

1. A sheet type glass electrode, comprising:

a substrate formed of a material having an electrical insulating property;

an electrode provided with an internal electrode portion and a lead portion fixed to an upper surface of the substrate; and

a support layer formed of a material having an electrical insulating property and describing a hole at a place corresponding to said internal electrode portion being formed on the upper surface of said substrate, whereby said lead portion and its circumference are exposed, said hole in the support layer being filled with a gelatinized internal solution, and a flat, plate-like ion-response glass membrane produced by subjecting a flat, plate-like glass, which has been previously formed with an appointed size, to a surface heating treatment with previous heating, is fixedly mounted on an upper surface of said support layer along a circumference thereof by the use of adhesives having an electrical insulating property so that a lower surface of said glass membrane may be stuck to an upper surface of said gelatinized internal solution and said hole may be filled with the gelatinized internal solution.

2. The invention of claim 1 wherein the substrate has a flat, planar configuration.

3. The invention of claim 2 wherein the support layer has a flat, planar configuration.

4. The invention of claim 3 wherein the internal electrode portion and the lead portion both have a flat, planar configuration.

5. The invention of claim 4 wherein the combined substrate, support layer, electrode, and glass membrane have a thickness of less than about 0.5 mm.

6. A sheet type composite electrode, comprising:

a flat, planar substrate made of an insulating material, the substrate having a central portion and an end portion;

a pair of flat outside electrodes fixed on the substrate, the outside electrodes each having an internal electrode portion positioned in the central portion of the substrate and also having a first lead portion extending to the end portion of the substrate;

a pair of flat inside electrodes fixed on the substrate;

a flat temperature-compensating electrode portion fixed between two ends of the inside electrodes;

a support layer made of an insulating material and defining a pair of holes that overlay the two internal electrode portions of the outside electrodes, and when so overlaid, the internal electrode portions interface a lower surface of the support layer, and also the end portion and the first lead portion remain exposed;

a pair of gelatinized internal solutions, one being disposed in each of the holes in the support layer;

a flat, plate-like ion-responsive glass membrane positioned across one hole and adhered on an upper surface of the support layer; and

a flat, plate-like liquid junction membrane positioned across the other hole and adhered on an upper surface of the support layer.

7. The invention of claim 6 wherein the inside electrodes are positioned between and generally parallel to the outside electrodes.

8. The invention of claim 7 wherein the inside electrodes have a second lead portion that extends to the end portion and remains exposed.

9. The invention of claim 8 wherein the ion-response glass membrane and the liquid junction membrane contact a respective internal solution.

10. In a sheet type composite electrode having a flat, insulating substrate;

two pairs of flat electrodes on the substrate; and

a flat, insulating support layer that overlays the substrate and the electrodes which describes at least a first and a second hole that expose portions of the electrodes to an internal solution, an improved membrane system, comprising;

an ion response membrane stationarily mounted on the support layer and positioned across the first hole to contact the internal solution, the ion response membrane having a flat, plate-like configuration and being constructed by producing a glass sheet with an aimed thickness, heating the glass sheet up to a temperature immediately below its melting temperature, and then adding an additional appointed quantity of thermal energy to the glass sheet, whereby only the surface of the glass sheet is melted and then solidified.

11. The invention of claim 10 wherein the glass sheet is optionally subjected to an etching treatment.

12. The improvement of claim 11 wherein the ion-response membrane is constructed by the further step of providing a glass block from which the glass sheet can be cut.

13. The invention of claim 12 wherein the glass sheet is heated by one of a laser heat radiation method, a lamp heat radiation method, and a belt transfer furnace method.

14. The improvement of claim 13 further comprising a flat, plate-like liquid junction membrane mounted on the support layer and positioned across the second hole.