Claims
- 1. A projection type cathode ray tube comprising:a panel; and an electron gun; wherein said electron gun has a plurality of electrodes including a cathode, a control electrode, an accelerating electrode, a first anode, a focus electrode and a second anode, which electrodes are arranged in a tube axial direction at predetermined intervals, and said second anode having a first cylindrical portion at a panel side and a second cylindrical portion at a cathode side, said first cylindrical portion having a larger inner diameter than an inner diameter of said second cylindrical portion, said focus electrode having a panel side cylindrical portion with an inner diameter D1 and a length L1, an intermediate cylindrical portion with an inner diameter D3 and a length L3, a cathode side cylindrical portion with an inner diameter D2 and a length L2, said inner diameters D1, D2, and D3 being different from each other, and said length L3 being larger than said length L2, and said focus electrode having a first funnel like connecting portion between said panel side cylindrical portion and said intermediate cylindrical portion.
- 2. A projection type cathode ray tube according to claim 1, wherein said second anode has a connecting portion between said first cylindrical portion and said second cylindrical portion, and a connecting position between said first funnel like connecting portion and said intermediate cylindrical portion of said focus electrode is nearer to said panel as compared to said connecting portion of said second anode.
- 3. A projection type cathode ray tube according to claim 2, wherein a length along said tube axial direction of said first funnel like connecting portion is substantially larger than a thickness of a cylindrical wall of said focus electrode.
- 4. A projection type cathode ray tube according to claim 2, wherein a cross section along said tube axial direction of said first funnel like connecting portion of said focus electrode has a tapered line beveled to a wall of said panel side cylindrical portion and a wall of said intermediate cylindrical portion.
- 5. A projection type cathode ray tube according to claim 2, wherein said inner diameters D1, D2, and D3 satisfies D1>D3>D2.
- 6. A projection type cathode ray tube according to claim 1, wherein said focus electrode has a second funnel like connecting portion between said intermediate cylindrical portion and said cathode side cylindrical portion.
- 7. A projection type cathode ray tube according to claim 6, wherein said second anode has a connecting portion between said first cylindrical portion and said second cylindrical portion, wherein a connecting position between said first funnel like connecting portion and said intermediate cylindrical portion of said focus electrode is nearer to said panel as compared to said connecting portion of said second anode.
- 8. A projection type cathode ray tube according to claim 7, wherein a length along said tube axial direction of said second funnel like connecting portion is substantially larger than a thickness of a cylindrical wall of said focus electrode.
- 9. A projection type cathode ray tube according to claim 7, wherein a cross section along said tube axial direction of said second funnel like connecting portion of said focus electrode has a tapered line beveled to a wall of said intermediate, cylindrical portion and a wall of said cathode side cylindrical portion.
- 10. A projection type cathode ray tube according to claim 7, wherein said inner diameters D1, D2, and D3 satisfies D1>D3>D2.
- 11. A projection type cathode ray tube comprising:a panel; and an electron gun; wherein said electron gun has a plurality of electrodes including a cathode, a control electrode, an accelerating electrode, a first anode, a focus electrode and a second anode, which electrodes are arranged in a tube axial direction at predetermined intervals, said second anode having a first cylindrical portion at a panel side and a second cylindrical portion at a cathode side, said first cylindrical portion having a larger inner diameter than an inner diameter of said second cylindrical portion, said the focus electrode having a panel side cylindrical portion with an inner diameter D1 and a length L1, an intermediate cylindrical portion with an inner diameter D3 and a length L3, a cathode side cylindrical portion with an inner diameter D2 and a length L2, said inner diameters D1, D2, and D3 being different from each other, and said focus electrode having a first funnel like connecting portion between said panel side cylindrical portion and said intermediate cylindrical portion and a second funnel like connecting portion between said intermediate cylindrical portion and said cathode side cylindrical portion.
- 12. A projection type cathode ray tube according to claim 11, wherein said second anode has a connecting portion between said first cylindrical portion and said second cylindrical portion, wherein connecting position between said first funnel like connecting portion and said intermediate cylindrical portion of said focus electrode is nearer to said panel as compared to said connecting portion of said second anode.
- 13. A projection type cathode ray tube according to claim 12, wherein a length along said tube axial direction of said second funnel like connecting portion is substantially larger than a thickness of a cylindrical wall of said focus electrode.
- 14. A projection type cathode ray tube according to claim 12, wherein a cross-section along said tube axial direction of said second funnel like connecting portion of said focus electrode has a tapered line beveled to a wall of said intermediate cylindrical portion and a wall of said cathode side cylindrical portion.
- 15. A projection type cathode ray tube according to claim 12, wherein said inner diameters D1, D2, and D3 satisfies D1>D3>D2.
- 16. A projection type cathode ray tube comprising:a panel; and an electron gun; wherein said electron gun has a plurality of electrodes including a cathode, a control electrode, an accelerating electrode, a first anode, a focus electrode and a second anode, which electrodes are arranged in a tube axial direction at predetermined intervals, and said second anode having a first cylindrical portion at said panel side and a second cylindrical portion at a cathode side, said first cylindrical portion having a larger inner dinner diameter than an inner diameter of said second cylindrical portion, said focus electrode having a panel side cylindrical portion with an inner diameter D1 and a length L1, an intermediate cylindrical portion with an inner diameter D3 and a length L3, a cathode side cylindrical portion with an inner diameter D2 and a length L2, said inner diameters D1, D2, and D3 being different from each other, wherein said focus electrode having a first funnel like connecting portion between said panel side cylindrical portion and said intermediate cylindrical portion, and said focus electrode having a gap in said cathode side cylindrical portion in said tube axial direction.
- 17. A projection type cathode ray tube according to claim 16, wherein said focus electrode is divided into two electrodes at said cathode side cylindrical portion, and said two electrodes are electrically connected.
- 18. A projection type cathode ray tube according to claim 16, wherein said second anode has a connecting portion between said first cylindrical portion and said second cylindrical portion, and a connecting position between said first funnel like connecting portion and said intermediate cylindrical portion of said focus electrode is nearer to said panel as compared to said connecting portion of said second anode.
- 19. A projection type cathode ray tube according to claim 16, wherein a length along said tube axial direction of said first funnel like connecting portion is substantially larger than a thickness of a cylindrical wall of said focus electrode.
- 20. A projection type cathode ray tube according to claim 16, wherein a cross-section along said tube axial direction of said first funnel like connecting portion of said focus electrode has a tapered line beveled to a wall of said panel side cylindrical portion and a wall of said intermediate cylindrical portion.
- 21. A projection type cathode ray tube according to claim 16, wherein said inner diameters D1, D2, and D3 satisfies D1>D3>D2.
- 22. A projection type cathode ray tube according to claim 16, wherein said focus electrode has a second funnel like connecting portion between said intermediate cylindrical portion and said cathode side cylindrical portion.
- 23. A projection type cathode ray tube according to claim 22, wherein said second anode has a connecting portion between said first cylindrical portion and said second cylindrical portion, and a connecting position between said first funnel like connecting portion and said intermediate cylindrical portion of said focus electrode is nearer to said as panel compared to said connecting portion of said second anode.
- 24. A projection type cathode ray tube according to claim 23, wherein a length along said tube axial direction of said second funnel like connecting portion is substantially larger than a thickness of a cylindrical wall of said focus electrode.
- 25. A projection type cathode ray tube according to claim 23, wherein a cross section along said tube axial direction of said second funnel like connecting portion of said focus electrode has a tapered line beveled to a wall of said intermediate cylindrical portion and a wall of said cathode side cylindrical portion.
- 26. A projection type cathode ray tube according to claim 23, wherein said inner diameters D1, D2, and D3 satisfies D1>D3>D2.
Priority Claims (1)
Number |
Date |
Country |
Kind |
9-82524 |
Apr 1997 |
JP |
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CROSS REFERENCE TO RELATED APPLICATION
This is a continuation of U.S. application Ser. No. 09/053,053, filed Apr. 1, 1998, now U.S. Pat. No. 6,031,326, the subject matter of which is incorporated by reference herein.
US Referenced Citations (6)
Number |
Name |
Date |
Kind |
3919583 |
Hasker et al. |
Nov 1975 |
A |
4904898 |
Penird et al. |
Feb 1990 |
A |
5113112 |
Shimoma et al. |
May 1992 |
A |
5162695 |
Shimona et al. |
Nov 1992 |
A |
5466983 |
Shirai et al. |
Nov 1995 |
A |
5894190 |
Hirota et al. |
Apr 1999 |
A |
Foreign Referenced Citations (5)
Number |
Date |
Country |
58-31696 |
Jul 1983 |
JP |
62-48653 |
Mar 1987 |
JP |
62-21216 |
May 1987 |
JP |
1-258346 |
Oct 1989 |
JP |
9-231915 |
Sep 1997 |
JP |
Continuations (1)
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Number |
Date |
Country |
Parent |
09/053053 |
Apr 1998 |
US |
Child |
09/501510 |
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US |