Collimator array and method for manufacturing the same

1. A collimator array, comprising:

a substrate having first and second faces;

a plurality of lenses formed on the first face of the substrate; and

a plurality of projecting parts corresponding, respectively, to the plurality of lenses, each projecting part being formed on a portion of the second face of the substrate corresponding to the respective lens that corresponds to the projecting part, wherein

the plurality of projecting parts are fusion-connected to a plurality of optical fibers, respectively, and

an area of a fusion-connected face of each projecting part is larger than a cross sectional area of the respective optical fiber to which the projecting part is fusion-connected.

2. The collimator array according to claim 1 ,

wherein each projecting part is formed by forming a concave part around a part corresponding to the corresponding lens.

3. The collimator array according to claim 2 ,

wherein a thickness of each projecting part is set so that the fusion-connected face of the projecting part is located on a focal position of the corresponding lens.

4. The collimator array according to claim 3 , further comprising:

a plurality of fiber protecting members for protecting the plurality of fibers, respectively, on the second face of the substrate.

5. The collimator array according to claim 2 , further comprising:

a plurality of fiber protecting members for protecting the plurality of fibers, respectively, on the second face of the substrate.

6. The collimator array according to claim 1 ,

wherein a thickness of each projecting part is set so that the fusion-connected face of the projecting part is located on a focal position of the corresponding lens.

7. The collimator array according to claim 6 , further comprising:

a plurality of fiber protecting members for protecting the plurality of fibers, respectively, on the second face of the substrate.

8. The collimator array according to claim 1 , further comprising:

a plurality of fiber protecting members for protecting the plurality of fibers, respectively, on the second face of the substrate.

9. The collimator array according to claim 1 ,

wherein the substrate, the lenses, and the projecting parts are made of quartz, respectively.

10. The collimator array according to claim 8 ,

wherein the fiber protecting members are made of quartz.

11. The collimator array according to claim 1 , further comprising:

an antireflection coating applied at least on the lenses.

12. The collimator array according to claim 1 , further comprising:

means for shielding unnecessary light provided on a portion other than the lenses on the first face of the substrate.

13. The collimator array according to claim 1 ,

wherein each of the lenses and each of the optical fibers are arranged on the substrate one-dimensionally.

14. The collimator array according to claim 1 ,

wherein each of the lenses and each of the optical fibers are arranged on the substrate two-dimensionally.

15. The collimator array according to claim 14 ,

wherein each of the lenses and each of the optical fibers are arranged on the substrate in a staggered row.

16. A method of manufacturing a collimator array, comprising:

forming a plurality of lenses on a first face of a substrate;

forming a plurality of projecting parts corresponding, respectively, to the plurality of lenses, on a second face of the substrate;

fusion-connecting a plurality of optical fibers to the plurality of projecting parts, respectively,

wherein a cross-sectional area of a fusion-connected face of each projecting part is larger than a cross-sectional area of the respective optical fiber to which the projecting part is fusion-connected.

17. The method of manufacturing a collimator array according to claim 16 , further comprising, for each projecting part:

performing said fusion-connecting after preliminarily heating the projecting part.

18. The method of manufacturing a collimator array according to claim 17 , further comprising:

adjusting a thickness of each projecting part by polishing the projecting part before fusion-connecting the respective optical fiber so that the fusion-connected face of the projection part is located on a focal position of the corresponding lens.

19. The method of manufacturing a collimator array according to claim 16 , further comprising:

adjusting a thickness of each projecting part by polishing the projecting part before fusion-connecting the respective optical fiber so that the fusion-connected face of the projection part is located on a focal position of the corresponding lens.

20. A collimator array comprising:

a substrate having first and second faces on opposite sides of the substrate;

a plurality of lenses formed on the first face of the substrate;

a plurality of projecting parts corresponding, respectively, to the plurality of lenses, and formed on the second face of the substrate; and

a plurality of optical fibers fusion-connected to the plurality of projecting parts, respectively, wherein an area of a fusion-connected face of each projecting part is larger than a cross sectional area of the respective optical fiber to which the projecting part is fusion-connected.

21. A collimator array as in claim 20 , wherein the fusion-connected face of each projecting part is located on a focal position of the corresponding lens.

22. A collimator array as in claim 20 , wherein the substrate, the plurality of lenses and the plurality of projecting parts are made of quartz.