Digital computer studies of electron lenses for cathode‐ray tubes
| Autor: | Tsunenari Saito, Senri Miyaoka, Shigeo Kubota |
|---|---|
| Rok vydání: | 1973 |
| Předmět: |
Physics
business.industry Astrophysics::Instrumentation and Methods for Astrophysics Physics::Optics General Physics and Astronomy Astigmatism medicine.disease law.invention Lens (optics) Entrance pupil Spherical aberration Optics law Apochromat Position (vector) Chromatic aberration medicine Focal length business |
| Zdroj: | Journal of Applied Physics. 44:4505-4510 |
| ISSN: | 1089-7550 0021-8979 |
| DOI: | 10.1063/1.1661990 |
| Popis: | The focal properties and the third‐order aberration coefficients of a number of unipotential lenses and a bipotential lens were investigated numerically using digital methods. The differential quotients of aberration coefficients in terms of the entrance pupil position were obtained in excellent agreement with those given by Berek in glass optics. The aberration coefficients were also calculated under the Fraunhofer condition for an infinite image position. For a fixed focal length, spherical aberration coefficients decrease and astigmatism coefficients increase as the length of the center electrode increases for equidiameter unipotential lenses. The symmetrical bipotential lens is almost astigmatism free for various voltage ratios; however, its spherical aberration coefficient is two to five times larger than those of equidiameter unipotential lenses operated at the same focal length. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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