Ultraviolet irradiation apparatus

1. An ultraviolet irradiation apparatus comprising:

a first electrode block and a second electrode block located apart from each other in a first direction or located in an electrically-insulated state in the first direction;

a recessed groove formed on a side surface of each of the first electrode block and the second electrode block extending in the first direction;

a first discharge lamp including an excimer lamp, partially fitted into the recessed grooves formed in both the first electrode block and the second electrode block, and located across the first electrode block and the second electrode block extending in the first direction;

a power supply part for supplying electrical power to the first discharge lamp;

a first current-carrying member that electrically connects the first electrode block and the power supply part;

a second current-carrying member capable of electrically connecting the second electrode block and the power supply part at an electrical potential different from that of the first current-carrying member; and

a light irradiation window for extracting ultraviolet light emitted from the first discharge lamp to outside, the light irradiation window being formed in a side of the first discharge lamp opposite from the first electrode block and in a side of the first discharge lamp opposite from the second electrode block, wherein

the first discharge lamp includes a tubular body filled with a first discharge gas containing a noble gas and a halogen gas, and

the recessed groove includes a shape fitted to the shape of side surface of the tubular body of the first discharge lamp.

2. The ultraviolet irradiation apparatus according to claim 1 , wherein the first electrode block and the second electrode block are made of a metallic member having reflective properties for the light emitted from the first discharge lamp.

3. The ultraviolet irradiation apparatus according to claim 1 ,

wherein the first current-carrying member includes a first screw member inserted at a predetermined position into the first electrode block and a first wire connecting the first screw member to the power supply part, and

the second current-carrying member includes a second screw member inserted at a predetermined position into the second electrode block and a second wire connecting the second screw member to the power supply part.

4. The ultraviolet irradiation apparatus according to claim 1 , wherein each of the first electrode block and the second electrode block has the recessed grooves formed in two or more positions apart from each other when viewed from the first direction, and

a number of the first discharge lamps corresponds to a number of the recessed grooves formed in each of the first electrode block and the second electrode block.

5. The ultraviolet irradiation apparatus according to claim 1 , further comprising a second discharge lamp having a lower starting voltage than the first discharge lamp, wherein

each of the first electrode block and the second electrode block has the recessed grooves formed in two or more positions apart from each other when viewed from the first direction, and

a number of the recessed grooves formed in each of the first electrode block and the second electrode block corresponds to a sum of a number of the first discharge lamps and a number of the second discharge lamps.

6. The ultraviolet irradiation apparatus according to claim 5 , wherein the number of the first discharge lamps is equal to or larger than the number of the second discharge lamps.

7. The ultraviolet irradiation apparatus according to claim 5 , wherein

the second discharge lamp includes a tubular body filled with a second discharge gas capable of emitting visible light.

8. The ultraviolet irradiation apparatus according to claim 7 , wherein the first discharge gas contains Kr and Cl, and

the second discharge gas contains Ne.

9. The ultraviolet irradiation apparatus according to claim 1 , wherein

the power supply part includes a battery and an electrical component that transforms a voltage supplied from the battery, and

the ultraviolet irradiation apparatus further comprises:

a battery holder that houses the battery;

an electrical component holder that is located in a position apart from the battery holder and houses the electrical component;

a lamp holder that is located in a position apart from the battery holder and the electrical component holder, houses the first electrode block, the second electrode block, and the first discharge lamp, and has the light irradiation window formed in part thereof; and

a casing member that houses the battery holder, the electrical component holder, and the lamp holder.

10. The ultraviolet irradiation apparatus according to claim 1 , wherein

at least a portion of the ultraviolet light emitted from the first discharge lamp travels toward the light irradiation window from the opposite side of where the first or second electrode block is located, as viewed from the tubular body of the first discharge lamp.

11. The ultraviolet irradiation apparatus according to claim 1 , further comprising:

a first holding member to hold the first electrode block and the first discharge lamp in a contact state; and

a second holding member to hold the second electrode block and the first discharge lamp in a contact state, wherein

the first and second holding members each include a presser member having a shape fitted to the shape of side surface of the tubular body.

12. The ultraviolet irradiation apparatus according to claim 1 , wherein the first and second electrode blocks are located apart in the first direction, and

both ends of the tubular body of the first discharge lamp protrude outward from the first and second electrode blocks with respect to the first direction.

13. The ultraviolet irradiation apparatus according to claim 10 , further comprising:

a first holding member to hold the first electrode block and the first discharge lamp in a contact state; and

a second holding member to hold the second electrode block and the first discharge lamp in a contact state, wherein

the first and second holding members each include a presser member having a shape fitted to the shape of side surface of the tubular body.

14. The ultraviolet irradiation apparatus according to claim 10 , wherein the first and second electrode blocks are located apart in the first direction, and

both ends of the tubular body of the first discharge lamp protrude outward from the first and second electrode blocks with respect to the first direction.

15. The ultraviolet irradiation apparatus according to claim 11 , wherein the first and second electrode blocks are located apart in the first direction, and

both ends of the tubular body of the first discharge lamp protrude outward from the first and second electrode blocks with respect to the first direction.