Test method and apparatus for spark plug ceramic insulator
AssigneeNgk Spark Plug Co., Ltd.
InventorsToshitaka Honda, Hiroyuki Tanabe
Life of this patent
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Abstract
A test method for a spark plug ceramic insulator includes placing a first electrode in an inner hole of the ceramic insulator and placing a second electrode on an outer peripheral side of the ceramic insulator, developing a defect in the ceramic insulator by the application of a first voltage onto the ceramic insulator between the first and second electrodes and detecting the defect in the ceramic insulator by the application of a second voltage, which is lower than a flashover voltage that causes a flashover of the ceramic insulator, onto the ceramic insulator between the first and second electrodes.
Claims13
A test method for a spark plug ceramic insulator, comprising:
- placing a first electrode in an inner hole of the ceramic insulator and placing a second electrode on an outer peripheral side of the ceramic insulator;
- developing a defect in the ceramic insulator by the application of a first voltage onto the ceramic insulator between the first and second electrodes;
- and
- detecting the defect in the ceramic insulator by the application of a second voltage onto the ceramic insulator between the first and second electrodes, the second voltage being lower than a flashover voltage that causes a flashover of the ceramic insulator.
A test apparatus for a spark plug ceramic insulator, comprising:
- a first electrode placed in an inner hole of the ceramic insulator;
- a second electrode placed on an outer peripheral side of the ceramic insulator;
- a defect development unit that develops a defect in the ceramic insulator through the application of a first voltage onto the ceramic insulator between the first and second electrodes;
- and
- a defect detection unit that detects the defect in the ceramic insulator through the application of a second voltage onto the ceramic insulator between the first and second electrodes, the second voltage being lower than a flashover voltage that causes a flashover of the ceramic insulator.
Dependencies are inferred from the claim text.