Claims
- 1. An X-ray tube comprising:a stem pin; a housing; a grid electrode structure for performing a grid electrode function, wherein at least a part of said grid electrode structure is fixed to said stem pin; an electron gun provided proximal to said grid electrode structure in said housing; a focusing electrode integrally formed with said housing; a cylindrical member having a first distal end abutting against said focusing electrode and a second distal end abutting against said grid electrode structure, said cylindrical member having a hollow portion and being configured to allow electrons directed from said grid electrode structure toward said focusing electrode to pass through the hollow portion of said cylindrical member; a stem coupled to said electron gun through at least one said stem pin, said housing being sealed by said stem; and an anode target to generate X-rays.
- 2. The X-ray tube according to claim 1, wherein said grid electrode structure comprises first and second grid electrode parts, said first grid electrode part is fixed to said stem pin, said second grid electrode part is separated from said first grid electrode part by a predetermined distance, and said cylindrical member abuts both of said second grid electrode part and said focusing electrode.
- 3. The X-ray tube according to claim 2, wherein the second distal end of the cylindrical member and said second grid electrode part fit to each other.
- 4. The X-ray tube according to claim 1, wherein the first distal end of said cylindrical member and the focusing electrode fit to each other.
- 5. The X-ray tube according to claim 1, wherein the cylindrical member has a communication path for communicating between the interior and the exterior of the cylindrical member.
- 6. The X-ray tube according to claim 1, wherein said cylindrical member and said housing are conductors, and said focusing electrode, said housing, and said cylindrical member are electrically connected to each other.
- 7. The X-ray tube according to claim 6, wherein said focusing electrode, said housing, and said grid electrode structure are electrically connected to each other.
- 8. The X-ray tube according to claim 1, wherein each said stem pin is a single-component stem pin.
Priority Claims (2)
Number |
Date |
Country |
Kind |
P10-194365 |
Jul 1998 |
JP |
|
P10-215657 |
Jul 1998 |
JP |
|
RELATED APPLICATIONS
This application is a Continuation patent application of U.S. application Ser. No. 09/755,090 filed on Jan. 8, 2001, now U.S. Pat. No. 6,526,122, which is a Continuation-in-part application of International Application No. PCT/JP99/03674 filed on Jul. 7, 1999.
US Referenced Citations (9)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2021310 |
Nov 1979 |
GB |
54-150997 |
Nov 1979 |
JP |
63-91943 |
Apr 1988 |
JP |
Continuations (1)
|
Number |
Date |
Country |
Parent |
09/755090 |
Jan 2001 |
US |
Child |
10/336921 |
|
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
PCT/JP99/03674 |
Jul 1999 |
US |
Child |
09/755090 |
|
US |