Short arc lamp

• US 20080007177A1
• Filed: 07/09/2007
• Published: 01/10/2008
• Est. Priority Date: 07/07/2006
• Status: Active Grant

• Current Assignee: Ushio Denki Kabushiki Kaisha (Ushio Incorporated)
• Original Assignee: Ushio Denki Kabushiki Kaisha (Ushio Incorporated)
• Inventors: Nishiaki, Aiko, Chiba, Shigeru
• Granted Patent: US 7,868,552 B2
• Time in Patent Office: Days
• US Class Current: 313/623
• CPC Class Codes: H01J 61/526 heating or cooling of electrodes
• CPC Class Codes: H01J 61/86 with discharge additionally constricted by close spacing of electrodes, e.g. for optical projection

Abstract

A short arc lamp comprises a body portion made from an insulating material and having a curved reflective surface, in which a concave discharge space is formed; a pair of cathode and anode disposed at a focal point of the reflective surface with a gap; a support member connected to the cathode; and an electric supply ring connected to the support member, wherein a heat release member is provided on the anode or the support member or when a heat capacity of the anode is A and that of the support member is B, a relationship of A and B is B/A>2.8.

Claims

1. A short arc lamp comprising:

a body portion made of an insulating material and having a curved reflective surface, in which a concave discharge space is formed;

a pair of cathode and anode disposed at a focal point of the reflective surface with a gap;

a support member joined to the cathode;

an electric supply ring connected to the support member,

wherein when a heat capacity of the anode is A and that of the support member is B, a relationship of A and B is B/A>

2.8.

2. The short arc lamp according claim 1, wherein the cathode is made of tungsten, and the support member is made of nickel.

3. The short arc lamp according to claim 1, wherein the two or more of the supporting members is joined to the cathode.

4. The short arc lamp according to claim 3, wherein the support members are provided at equal intervals around the cathode.

5. The short arc lamp according to claim 3, wherein the support member is provided in parallel to a lamp axis.

6. The short arc lamp according to claim 1, wherein the support member has first and second sides in a lamp axis direction, the first side is longer than the second side, and the first side is joined to the cathode.

7. The short arc lamp according to claim 1, wherein a heat release member is connected to the support member.

8. The short arc lamp according to claim 7, wherein the heat release member is a plate-like member.

9. The short arc lamp according to claim 7, wherein two or more of the heat release members are joined to the support member.

10. The short arc lamp according to claim 7, wherein the heat release member is made of molybdenum.

11. The short arc lamp according to claim 7, wherein the heat release member is a circular member.

12. The short arc lamp according to claim 1, wherein a heat release member is connected to the cathode.

13. The short arc lamp according to claim 12, wherein two or more of the heat release members are joined to the cathode.

14. The short arc lamp according to claim 13, wherein the heat release members are provided at equal intervals around the cathode.

15. The short arc lamp according to claim 14, wherein the heat release member is provided in parallel to a lamp axis.

16. The short arc lamp according to claim 12, wherein the heat release member is crooked.

17. The short arc lamp according to claim 12, wherein the heat release member is provided so as to be winded spirally.

18. A short arc lamp comprising:

a body portion made of an insulating material and having a curved reflective surface, in which a concave discharge space is formed;

a pair of cathode and anode disposed at a focal point of the reflective surface with a gap;

a support member joined to the cathode;

an electric supply ring connected to the support member; and

a heat release member joined to the support member,

wherein when a heat capacity of the cathode is A and a total heat capacity of the support member and the heat release member is B, a relationship of A and B is B/A>

2.8.

19. A short arc lamp comprising:

a body portion made of an insulating material and having a curved reflective surface, in which a concave discharge space is formed;

a pair of cathode and anode disposed at a focal point of the reflective surface with a gap;

a support member joined to the cathode;

an electric supply ring connected to the support member; and

a heat release member joined to the cathode,

wherein when a total heat capacity of the cathode and the heat release member is A and a total heat capacity of the support member is B, a relationship of A and B is B/A>

2.8.