JPS5519731A - Electron gun - Google Patents
Electron gunInfo
- Publication number
- JPS5519731A JPS5519731A JP9224878A JP9224878A JPS5519731A JP S5519731 A JPS5519731 A JP S5519731A JP 9224878 A JP9224878 A JP 9224878A JP 9224878 A JP9224878 A JP 9224878A JP S5519731 A JPS5519731 A JP S5519731A
- Authority
- JP
- Japan
- Prior art keywords
- electrode
- thickness
- cathode
- diameter
- grid
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To widely reduce the beam spot diameter when in a big current, by setting the values of proportion, to within a prescribed range, that is, the sum of distance across cathode G1 to electrode and thickness of electrode G2, each with respect to the electrode G1 hole diameter.
CONSTITUTION: When assumed g1 for the distance, between a cathode 1 and the first grid G1 electrode 2, t1 for the thickness of the G1 electrode 2 and D1 for the G1 electorde hole diameter, the value of (g1+t1)/D1 is made more than 0.4, with an aberration of cathode lens decreased to reduce the diameter of crossover. On the other hand, the ratio, of a second grid G2 electrode 3 thickness t2 for D1, t2/D1, is made more than 0.4, with a divergence angle 12 made small further with a setting made to within a range of (t2/D1<1) not to provide an excessive prefocus lens action. And to maintain the beam divergence angle 12 at an accurate value, the maximum value of (g1+t1)/D1 is determined to set to less than 0.8.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9224878A JPS5519731A (en) | 1978-07-27 | 1978-07-27 | Electron gun |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9224878A JPS5519731A (en) | 1978-07-27 | 1978-07-27 | Electron gun |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5519731A true JPS5519731A (en) | 1980-02-12 |
Family
ID=14049116
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9224878A Pending JPS5519731A (en) | 1978-07-27 | 1978-07-27 | Electron gun |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5519731A (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4852371A (en) * | 1971-11-01 | 1973-07-23 | ||
JPS4958745A (en) * | 1972-06-24 | 1974-06-07 |
-
1978
- 1978-07-27 JP JP9224878A patent/JPS5519731A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4852371A (en) * | 1971-11-01 | 1973-07-23 | ||
JPS4958745A (en) * | 1972-06-24 | 1974-06-07 |
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