Optical connector

• US 5,619,605 A
• Filed: 12/29/1995
• Issued: 04/08/1997
• Est. Priority Date: 04/30/1993
• Status: Expired due to Fees

• Current Assignee: Nippon Telegraph and Telephone Corporation, Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Original Assignee: Nippon Telegraph and Telephone Corporation, Sumitomo Electric Industries Limited (Sumitomo Corporation)
• Inventors: Matsuura, Ichiro, Honjo, Makoto, Kakii, Toshiaki, Nagasawa, Shinji, Ueda, Tomohiko, Yamanishi, Toru
• Primary Examiner(s): NGO, HUNG NHAT
• Application Number:
  US08/580,587
• Time in Patent Office: 466 Days
• Field of Search: 385/71, 385/80, 385/114, 385/85, 385/54, 385/89, 385/115, 385/120, 385/59
• US Class Current: 385/80
• CPC Class Codes: G02B 6/3821 with axial spring biasing or loading means G02B6/3847 takes precedence
• CPC Class Codes: G02B 6/3822 with beveled fibre ends
• CPC Class Codes: G02B 6/3861 Adhesive bonding adhesives in general C09J
• CPC Class Codes: G02B 6/3863 fabricated by using polishing techniques grinding of the fibre ends B24B19/226
• CPC Class Codes: G02B 6/3865 fabricated by using moulding techniques shaping techniques of plastic materials in general B29C; producing plastic optical fiber connectors B29D11/0075
• CPC Class Codes: G02B 6/3885 Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type optical ribbon cable G02B6/4403, G02B6/448
• CPC Class Codes: G02B 6/389 characterised by the method of fastening connecting plugs and sockets, e.g. screw- or nut-lock, snap-in, bayonet type

Abstract

A novel optical connector that includes the following: an optical connector ferrule which is capable of fixing optical fibers; optical fibers fixed onto the optical connector ferrule, such that the end surfaces of the optical fibers project beyond an end surface of the optical connector ferrule; an adhesive for fixing the optical fibers onto the optical connector ferrule; and a member whose Young'"'"'s Modulus is less than that of the optical fiber and is provided to an area on the end surface of the optical connector ferrule surrounding, at a minimum, the projected portions of the optical fibers. And when the end surface of the optical connector is polished, the ends of the optical fibers are capable of projecting from the end surface of the optical connector ferrule, even if the end surface portion of the optical connector ferrule contains a filler, the hardness of which is less than that of the optical fibers.

Claims

1. An optical connector comprising:

an optical connector ferrule capable of fixing optical fibers;

optical fibers fixed onto said optical connector ferrule, so that the end surfaces of said optical fibers project from an end surface of said optical connector ferrule a distance of less than about 1 μ

m;

an adhesive for fixing said optical fibers onto said optical connector ferrule; and

a member whose Young'"'"'s Modulus is less than that of said optical fibers, said member being provided to an area on said end surface of said optical connector ferrule surrounding the projected portions of said optical fibers, such that the end surfaces of said optical fibers project beyond said member.

2. The optical connector according to claim 1, wherein the Young'"'"'s Modulus of the member is from 100 to 1000 kgf/mm².

3. The optical connector according to claim 2, wherein the member includes a filler, and further wherein the hardness of said filler is less than that of the optical fibers.

4. The optical connector according to claim 3, wherein the hardness of the filler is from 3 to 6.5 in Mohs'"'"' scale.

5. The optical connector according to claim 2, wherein the end surface of the optical connector ferrule and the end surfaces of the optical fibers are inclined by 5°

or more with respect to a plane orthogonal to an optical axis of said optical fibers.

6. The optical connector according to claim 1, wherein the optical connector ferrule includes a filler, and further wherein the hardness of said filler is less than that of the optical fibers.

7. The optical connector according to claim 6, wherein the hardness of the filler is from 3 to 6.5 in Mohs'"'"' scale.

8. The optical connector according to claim 6, wherein the end surface of the optical connector ferrule and the end surfaces of the optical fibers are inclined by 5°

or more with respect to a plane orthogonal to an optical axis of said optical fibers.

9. The optical connector according to claim 1, wherein the adhesive includes a filler, and further wherein the hardness of said filler is less than that of the optical fibers.

10. The optical connector according to claim 9, wherein the hardness of the filler is from 3 to 6.5 in Moh'"'"'s scale.

11. The optical connector according to claim 9, wherein the end surface of the optical connector ferrule and the end surfaces of the optical fibers are inclined by 5°

or more with respect to a plane orthogonal to an optical axis of said optical fibers.

12. The optical connector according to claim 1, wherein the member is of the same material as the adhesive.

13. The optical connector according to claim 12, wherein the end surface of the optical connector ferrule and the end surfaces of the optical fibers are inclined by 5°

or more with respect to a plane orthogonal to an optical axis of said optical fibers.

14. The optical connector according to claim 1, wherein the end surfaces of said optical fibers and said optical connector ferrule are polished.

15. An optical connector comprising:

an optical connector ferrule capable of fixing optical fibers;

optical fibers fixed onto said optical connector ferrule, so that the end surfaces of said optical fibers project from an end surface of said optical connector ferrule, such that said end surfaces of said optical fibers and said end surface of said optical connector ferrule are inclined by 5°

or more with respect to a plane orthogonal to an optical axis of said optical fibers;

an adhesive for fixing said optical fibers onto said optical connector ferrule; and

a member whose Young'"'"'s Modulus is less than that of said optical fibers, said member being provided to an area on said end surface of said optical connector ferrule surrounding the projected portions of said optical fibers, wherein the end surfaces of the optical fibers project from an end surface of the optical connector ferrule a distance of less than about 1 μ

m.