Molded ferrule holder with coupling features for optical fiber connectors

Patent metadata

Field	Value
Publication number	US-11808993-B2
Application number	US-202117521013-A
Country	US
Kind code	B2
Filing date	Nov 8, 2021
Priority date	Nov 19, 2020
Publication date	Nov 7, 2023
Grant date	Nov 7, 2023

Abstract

The present disclosure relates to a molded ferrule holder that can be coupled to a ferrule eliminating the need for automated injection molding machines and allowing for the use of low cost, low temperature polymers for the ferrule holder materials.

First claim

What is claimed is:

1. A ferrule assembly comprising:
a ferrule comprising a plurality of notches arranged around a circumference of the ferrule, wherein the plurality of notches is diametrically opposed about a longitudinal axis of the ferrule; and
a ferrule holder coupled to the ferrule, wherein the ferrule holder is made of at least one of: a liquid crystal polymer, polycarbonate (PC), polybutylene terephthalate, acrylonitrile butadiene styrene (ABS), PC/ABS blend, polymethylpentene (TPX or PMP), polycyclohexylenedimethylene (PCT), cycloolefinic polymer (COC), glass filled PC, PBT or polyamides, or PC siloxane;
wherein the ferrule holder imparts a strain of between about 4% to 6% onto the ferrule as measured by ASTM D638; and
wherein the ferrule holder includes a plurality of flexible arms engageable with the plurality of notches of the ferrule.

2. The ferrule assembly of claim 1 , wherein the plurality of flexible arms each include a protrusion corresponding to the plurality of notches, wherein the protrusions engage with the plurality of notches to couple the ferrule and the ferrule holder.

3. The ferrule assembly of claim 1 , wherein the ferrule holder is movable between an open configuration and a closed configuration;
wherein in the open configuration, the flexible arms are angled with respect to a longitudinal axis of the ferrule holder; and
wherein in the closed configuration, the flexible arms are substantially parallel to the longitudinal axis and the flexible arms engage with the notches of the ferrule.

4. The ferrule assembly of claim 1 , wherein the ferrule holder has a processing temperature between 100° C. and 300° C. as measured by a melt flow index.

5. A method of making a ferrule holder comprising:
inserting a material into a cavity of a mold, wherein the cavity of the mold is shaped as the ferrule holder, wherein the material is in a molten state at a processing temperature ranging between 100° C. and 350° C. as measured by a melt flow index;
cooling the material for a duration between 0.5 seconds and 20 seconds; and
disassembling the mold;
wherein the ferrule holder includes a plurality of flexible arms; and
wherein the plurality of flexible arms each include a protrusion configured to engage with a respective one of a plurality of notches on a ferrule to couple the ferrule and the ferrule holder.

6. The method of claim 5 , wherein the material is made of at least one of: a liquid crystal polymer, polycarbonate (PC), polybutylene terephthalate, acrylonitrile butadiene styrene (ABS), PC/ABS blend, polymethylpentene (PMP), polycyclohexylenedimethylene (PCT), cycloolefinic polymer (COC), polyamides, or PC siloxane.

7. The method of claim 5 , wherein the material is selected from the group consisting of: a liquid crystal polymer, polycarbonate (PC), polybutylene terephthalate, acrylonitrile butadiene styrene (ABS), PC/ABS blend, polymethylpentene (PMP), polycyclohexylenedimethylene (PCT), cycloolefinic polymer (COC), polyamides, or PC siloxane.

8. The method of claim 5 , wherein the processing temperature is between 150° C. and 300° C. as measured by a melt flow index.

9. The method of claim 5 , wherein the ferrule holder has a processing temperature between 225° C. and 300° C. as measured by a melt flow index.

10. The method of claim 5 , wherein the ferrule holder is movable between an open configuration and a closed configuration;
wherein in the open configuration, the flexible arms are angled with respect to a longitudinal axis of the ferrule holder; and
wherein in the closed configuration, the flexible arms are substantially parallel to the longitudinal axis and the flexible arms engage with the notches of the ferrule.

11. A method of assembling a ferrule and a ferrule holder to form a ferrule assembly, wherein the ferrule includes a front end, a rear end, and a plurality of notches around a circumference of the ferrule, and wherein the ferrule holder includes the plurality of flexible arms each having a protrusion, the plurality of flexible arms defining a front opening, the method comprising:
inserting a rear end of the ferrule into the front opening of the ferrule holder; and
engaging the plurality of protrusions with the plurality of notches to couple the ferrule and the ferrule holder in a snap fit configuration;
wherein the ferrule holder imparts a strain of between about 4% to 6% onto the ferrule as measured by ASTM D638.

12. The method of claim 3 , wherein the ferrule holder is movable between an open configuration and a closed configuration;
wherein in the open configuration, the flexible arms are angled with respect to a longitudinal axis of the ferrule holder; and
wherein in the closed configuration, the flexible arms are substantially parallel to the longitudinal axis and the flexible arms engage with the notches of the ferrule.

13. The method of claim 12 , wherein the ferrule is inserted into the ferrule holder when the ferrule holder is in the open configuration, and the ferrule holder moves to the closed configuration once the notches are within a bore of the ferrule holder such that the plurality of protrusions of the flexible arms of the ferrule holder engage with the plurality of notches.

14. The method of claim 11 , wherein the ferrule holder is made of at least one of: a liquid crystal polymer, polycarbonate (PC), polybutylene terephthalate, acrylonitrile butadiene styrene (ABS), PC/ABS, polymethylpentene (TPX or PMP), polycyclohexylenedimethylene (PCT), cycloolefinic polymer (COC), glass filled PC, PBT or polyamides.

15. A fiber optic connector assembly comprising:
an inner housing having an internal cavity;
a ferrule assembly received in the internal cavity, the ferule assembly comprising:
a ferrule comprising a plurality of notches arranged around a circumference of the ferrule, wherein the plurality of notches are diametrically opposed about a longitudinal axis of the ferrule; and
a ferrule holder coupled to the ferrule, wherein the ferrule holder is made of at least one of: a liquid crystal polymer, polycarbonate (PC), polybutylene terephthalate, acrylonitrile butadiene styrene (ABS), PC/ABS blend, polymethylpentene (TPX or PMP), polycyclohexylenedimethylene (PCT), cycloolefinic polymer (COC), glass filled PC, PBT or polyamides, or PC siloxane;
wherein the ferrule holder imparts a strain of between about 4% to 6% onto the ferrule as measured by ASTM D638, and
wherein the ferrule holder includes a plurality of flexible arms engageable with the plurality of notches of the ferrule.

Assignees

• Corning Res & Dev Corp

Inventors

• Baca Adra Smith
• Isenhour Micah Colen

Classifications

• G02B6/3869 Primary

  Mounting ferrules to connector body, i.e. plugs · CPC title