| Presentation | 1999/3/19 Ir-coated dispenser cathodes for CRTs Toshiharu Higuchi, Sadao Matsumoto, Toru Yakabe, Shigeru Sugawara, Tuneo Fukui, |
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| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Strong demand exists for the development of high-current-density and long-life cathodes for use in cathode ray tubes (CRTs). In response to this demand, the authors have developed and implemented the mass production of two types of Ir-coated 411 type dispenser cathodes having a heater power of 1.31 W and 0.76 W, respectively. These cathodes were designed by computer simulation, and have a structure that allows them to be assembled in electron guns configured for conventional oxide cathodes. The following three types of life tests were carried out in order to confirm the reliability of the cathodes: (1) To investigate temperature changes during the life of the cathodes, a life test of approximately 40,000 h was conducted. The resultant temperature change was small, confirming that the reliability of the cathodes is satisfactory. (2) To investigate emission life, a 32,000 h life test was conducted. The stability of the emission current was thereby confirmed. (3) To investigate heater life, 39,000 h life tests were conducted at several heater temperature levels with a voltage of 300 V applied between the heater and the cathode. From the results of these tests, the minimum life of the heater is estimated to be 80,000 h. The results obtained in the above tests confirm that these cathodes possess good reliability. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Dispenser cathode / Impregnated cathode / Cathode / Cathode ray tube / Life |
| Paper # | EID98-238 |
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| Conference Information | |
| Committee | EID |
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| Conference Date | 1999/3/19(1days) |
| Place (in Japanese) | (See Japanese page) |
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| Topics (in Japanese) | (See Japanese page) |
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| Registration To | Electronic Information Displays (EID) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Ir-coated dispenser cathodes for CRTs |
| Sub Title (in English) | |
| Keyword(1) | Dispenser cathode |
| Keyword(2) | Impregnated cathode |
| Keyword(3) | Cathode |
| Keyword(4) | Cathode ray tube |
| Keyword(5) | Life |
| 1st Author's Name | Toshiharu Higuchi |
| 1st Author's Affiliation | Toshiba Corporation, Electron Tubes & Devices Division() |
| 2nd Author's Name | Sadao Matsumoto |
| 2nd Author's Affiliation | Toshiba Corporation, Electron Tubes & Devices Division |
| 3rd Author's Name | Toru Yakabe |
| 3rd Author's Affiliation | Toshiba Corporation, Electron Tubes & Devices Division |
| 4th Author's Name | Shigeru Sugawara |
| 4th Author's Affiliation | Toshiba Corporation, Cathode Ray Tube Division |
| 5th Author's Name | Tuneo Fukui |
| 5th Author's Affiliation | Toshiba Corporation, Cathode Ray Tube Division |
| Date | 1999/3/19 |
| Paper # | EID98-238 |
| Volume (vol) | vol.98 |
| Number (no) | 666 |
| Page | pp.pp.- |
| #Pages | 4 |
| Date of Issue | |