Optical ferrules and optical ferrule molds

Patent metadata

Field	Value
Publication number	US-11327244-B2
Application number	US-202016946248-A
Country	US
Kind code	B2
Filing date	Jun 12, 2020
Priority date	Oct 12, 2015
Publication date	May 10, 2022
Grant date	May 10, 2022

Abstract

A unitary optical ferrule is molded to include one or more elements for receiving and securing one or more optical waveguides one or more elements for affecting one or more characteristics of light from the optical waveguide while propagating the light within the ferrule. The optical ferrule also includes one or more first alignment features and one or more second alignment features that, when the ferrule is mated with a mating ferrule, each controls alignment of the ferrule with the mating ferrule along three mechanical degrees of freedom. The surface of the optical ferrule can be divided along the thickness axis into a first section and an opposing second section, wherein the first section of the surface includes the receiving and securing elements, the light affecting elements, and the first alignment features and the second section of the surface includes the second alignment features.

First claim

The invention claimed is:

1. An optical ferrule configured to mate with an identical optical ferrule comprising:
one or more receiving elements, each receiving element configured for receiving and securing an optical waveguide; and
one or more light affecting elements, each light affecting element comprising:
a light redirecting feature comprising:
a curved lens in an optical path of light from the optical waveguide, the receiving element configured to align the optical waveguide with the lens; and
a planar region at least partially surrounding the lens and comprising a first reference surface for the lens; and

an intermediate surface that extends between the receiving element and the light redirecting feature and comprising a second reference surface, wherein the first reference surface is disposed at a predetermined angle with respect to the second reference surface that determines a positional relationship between the lens and the waveguide.

2. The optical ferrule of claim 1 , wherein variation in the angle is controlled to less than +/−0.03 degrees.

3. The optical ferrule of claim 1 , wherein the intermediate surface is a planar surface.

4. The optical ferrule of claim 1 , wherein the receiving element is a groove and the receiving element feature is the bottom of the groove.

5. The optical ferrule of claim 1 , wherein the receiving elements and the light affecting elements are disposed on a first side of the optical ferrule and further comprising a planar mating surface disposed on a second side of the optical ferrule opposite the first side.

6. The optical ferrule of claim 5 , wherein the second side further comprises an optical window configured to transmit the light out of the optical ferrule, wherein forward and rear portions of the planar mating surface are disposed on either side of the optical window.

7. The optical ferrule of claim 1 , wherein the optical ferrule includes a plurality of light affecting elements and a plurality of receiving elements and further comprising one or more fiducials corresponding to each of the plurality of receiving elements and one or more fiducials corresponding to each of the plurality of light affecting elements.

8. An optical ferrule configured to mate with an identical optical ferrule comprising:
one or more receiving elements, each receiving element configured for receiving and securing an optical waveguide; and
one or more light affecting elements, each light affecting element comprising:
a light redirecting feature comprising:
a curved lens in an optical path of light from the optical waveguide, the receiving element configured to align the optical waveguide with the lens; and
a planar region at least partially surrounding the lens the planar region comprising a first reference surface for the lens,

wherein the first reference surface is disposed at an angle with respect to a second reference surface of the optical ferrule that determines a positional relationship between the lens and the waveguide.

9. The optical ferrule of claim 8 , wherein the receiving element comprises a groove and the second reference surface is the bottom of the groove.

10. The optical ferrule of claim 8 , wherein the light affecting element includes an intermediate surface that extends between the receiving element and the light affecting element and the intermediate surface comprises the second reference surface.

11. The optical ferrule of claim 8 , wherein the receiving elements and the light affecting elements are disposed on a first side of the optical ferrule and further comprising a planar surface disposed on a second side of the optical ferrule opposite the first side and the planar surface comprises the second reference surface.

12. An injection mold comprising:
a first mold side and a second mold side that fit together to define a cavity for molding a unitary optical ferrule, the cavity configured to separate along a parting axis, the unitary optical ferrule being molded with a thickness axis parallel to the parting axis, the first mold side having mold features configured to mold:
one or more receiving elements, each receiving element configured for receiving and securing an optical waveguide;
one or more light affecting elements, each light affecting element comprising:
a light redirecting feature comprising:
a curved lens in an optical path of light from the optical waveguide, the receiving element configured to align the optical waveguide with the lens; and
a planar region at least partially surrounding the lens and comprising a first reference surface for a position of the lens,
wherein the first reference surface is disposed at an angle with respect to a second reference surface of the optical ferrule that determines a positional relationship between the lens and the waveguide.

13. The injection mold of claim 12 , wherein the receiving element comprises a groove and the second reference surface is the bottom of the groove.

14. The injection mold of claim 12 , wherein the light affecting element includes an intermediate surface that extends between the receiving element and the light affecting element and the intermediate surface comprises the second reference surface.

15. The injection mold of claim 12 , wherein the receiving elements and the light affecting elements are disposed on a first side of the optical ferrule and further comprising a planar surface disposed on a second side of the optical ferrule opposite the first side and the planar surface comprises the second reference surface.

16. The injection mold of claim 12 , wherein the first mold side includes at least one mold feature configured to mold at least a first fiducial corresponding to the light affecting element and at least one mold feature configured to mold at least a second fiducial corresponding to the receiving element.

17. The injection mold of claim 12 , wherein mold features are configured to mold a plurality of light affecting elements, a plurality of receiving elements and at least one fiducial corresponding to at least one of the plurality of light affecting elements, or at least one of the plurality of receiving elements.

Assignees

• 3M Innovative Properties Co

Inventors

• Haase Michael A
• Mathews Alexander R
• Smith Terry L
• Nelson James M

Classifications

• G02B6/3865 Primary

  fabricated by using moulding techniques (shaping techniques of plastic materials in general B29C; producing plastic optical fiber connectors B29D11/0075) · CPC title

• G02B6/3839

  for a plurality of light guides · CPC title

• G02B6/3885 Primary

  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 title

• G02B6/383

  Hermaphroditic connectors, i.e. two identical plugs mating with one another, each plug having both male and female diametrically opposed engaging parts; (electric hermaphroditic coupling H01R24/84, H01R13/28) · CPC title

• G02B6/366

  the additional structures allowing for adjustment or alignment in all dimensions, i.e. 3D microoptics arrangements, e.g. free space optics on the microbench, microhinges or spring latches, with associated microactuating elements for fine adjustment or alignment · CPC title