Method of producing ionization chamber detector

• US 4,640,729 A
• Filed: 06/04/1985
• Issued: 02/03/1987
• Est. Priority Date: 06/04/1984
• Status: Expired due to Term

• Current Assignee: Hitachi, Ltd., Hitachi Medical Corporation (Hitachi, Ltd.)
• Original Assignee: Hitachi, Ltd., Hitachi Medical Corporation (Hitachi, Ltd.)
• Inventors: Sato, Shigeru, Yanagihara, Eiichi, Hayakawa, Takayuki, Fujii, Hideji
• Primary Examiner(s): MASSIE, JEROME W
• Application Number:
  US06/741,108
• Time in Patent Office: 609 Days
• Field of Search: 250/336.1, 250/363.2, 250/363.4, 250/363.8, 250/367, 250/385, 156/275.5, 156/293, 156/257, 156/307.5, 156/307.7, 156/330, 313/326
• US Class Current: 156/257
• CPC Class Codes: H01J 47/02 Ionisation chambers
• CPC Class Codes: Y10T 156/1064 Partial cutting [e.g., grooving or incising]

Abstract

In an ionization chamber detector of the type in which a plurality of flat anode and cathode electrodes are alternately arranged in a predetermined gaseous medium, this invention provides a method of producing an ionization chamber detector which is characterized in that a plurality of ditches having a width a little bit greater than the thickness of the electrodes are formed on the inner surfaces of a pair of insulators disposed in the spaced-apart relation for supporting and fixing the anode and cathode electrodes, an adhesive is applied in advance temporarily in a rectangular form to both or one surface of each electrode at those positions which are set back by a distance corresponding to the thickness of the electrodes from both edge portions, another adhesive having a low viscosity is charged from the end portions of the ditches into the gaps between the electrodes and the ditch walls after the electrodes are inserted into the ditches, and the tentative adhesive and the adhesive having a low viscosity are then cured integrally in order to firmly bond and fix the electrodes into the ditches. This method can keep the distance between the electrodes highly accurate and can bond and fix reliably and stably the electrodes into the ditches.

Claims

1. A method of manufacturing an ionization chamber detector of the type in which a plurality of flat anode and cathode electrodes are alternately arranged in a predetermined gaseous medium, comprising the steps of:

forming a plurality of ditches of predetermined depth on respective surfaces of a pair of insulators;

disposing said insulators in spaced-apart relation, whereby opposing edges of said anode and cathode electrodes can be supported and fixed in said ditches;

applying a first adhesive having a B stage to portions of at least one surface of said anode and cathode electrodes, said portions being spaced a predetermined distance from the opposing edges of said anode and cathode electrodes which are to be supported and fixed in said ditches;

inserting the opposing edges of said anode and cathode electrodes, having said B stage adhesive thereon, respectively into said ditches on said respective surfaces of said pair of insulators such that there is a gap between said anode and cathode electrodes and the walls of said ditches;

charging a second curable adhesive having a low viscosity into the gaps between said anode and cathode electrodes and walls of said ditches; and

curing integrally said first adhesive having a B stage and said second adhesive in order to bond and fix said anode and cathode electrodes in said ditches.

2. A method of producing an ionization chamber detector as defined in claim 1, wherein said first adhesive having a B stage is applied to portions of at least one surface of said anode and cathode electrodes, said first adhesive being applied in a rectangular form.

3. The method of producing an ionization chamber detector as defined in claim 2, wherein said predetermined distance is equal to said predetermined depth of said ditches.

4. The method of producing an ionization chamber detector as defined in claim 2, wherein said predetermined distance is about 0.1 mm greater than the predetermined depth of said ditches.

5. A method of producing an ionization chamber detector as defined in claim 3, wherein said second adhesive is charged from end portions of said ditches into the gaps between said anode and cathode electrodes and said walls of said ditches.

6. The method of producing an ionization chamber detector as defined in claim 1, wherein said ditches have a width 0.01 to 0.02 mm wider than a thickness of a respective one of said anode and cathode electrodes.

7. The method of producing an ionization chamber detector as defined in claim 2, wherein said ditches have a width 0.01 to 0.02 mm wider than a thickness of a respective one of said anode and cathode electrodes.

8. The method of producing an ionization chamber detector as defined in claim 3, wherein said ditches have a width 0.01 to 0.02 mm wider than a thickness of a respective one of said anode and cathode electrodes.

9. The method of producing an ionization chamber detector as defined in claim 5, wherein said ditches have a width 0.01 to 0.02 mm wider than a thickness of a respective one of said anode and cathode electrodes.

10. The method of producing an ionization chamber detector as defined in claim 1, wherein said second adhesive is an epoxy resin diluted with solvent.

11. The method of producing an ionization chamber detector as defined in claim 1, wherein said insulators are made of a transparent material and said second adhesive is a resin, curable by UV, the liquid adhesive having a low viscosity.

12. The method of producing an ionization chamber detector as defined in claim 1, wherein the first adhesive is applied to both surfaces of the anode and cathode electrodes.

13. The method of producing an ionization chamber detector as defined in claim 1, wherein particulate matter of the second adhesive has a maximum particle size of 3 μ

m.

14. The method of producing an ionization chamber detector as defined in claim 1, wherein the first adhesive is applied to one surface of each of the anode and cathode electrodes.