FIBER OPTIC CONNECTOR

• US 20140050446A1
• Filed: 08/16/2012
• Published: 02/20/2014
• Est. Priority Date: 08/16/2012
• Status: Active Grant

• Current Assignee: SENKO Advanced Components, Inc. (SENKO Group Holdings Co., Ltd.)
• Original Assignee: Jimmy Jun-Fu Chang
• Inventors: CHANG, Jimmy Jun-Fu
• Granted Patent: US 8,974,124 B2
• Time in Patent Office: Days
• US Class Current: 385/81
• CPC Class Codes: G02B 6/3821 with axial spring biasing or loading means G02B6/3847 takes precedence
• CPC Class Codes: G02B 6/3869 Mounting ferrules to connector body, i.e. plugs

Abstract

A connector for a fiber optic cable is disclosed, as well as a housing therefor, wherein the housing is formed as a single unitary piece to simplify construction and assembly. A ferrule assembly may be configured in conjunction with the housing to provide a retentive coupling between the assembly and the housing upon insertion of the assembly into the housing.

Claims

1. An optical fiber connector comprising:

a housing having a first end for receiving an optical fiber, a second end opposite the first end, and a longitudinal passage extending from the first end to the second end;

a ferrule assembly comprising a ferrule holder and ferrule, the ferrule assembly for being inserted into and disposed within the passage, and longitudinally movable within the passage, the ferrule assembly being configured for retaining an optical fiber therein; and

at least one of the housing and the ferrule holder comprising a portion for engaging the other of the housing and the ferrule holder for retaining the ferrule assembly within the passage.

2. The connector of claim 1, further comprising:

a resilient member for biasing the ferrule assembly towards the second end of the housing; and

at least one of the housing and the ferrule holder comprising a portion for engaging the other of the housing and the ferrule holder for retaining the ferrule assembly within the passage in opposition to the bias of the resilient member.

3. The connector of claim 1, wherein the portion for engaging comprises at least one integral projecting portion of the one of the housing and the ferrule holder, and the other of the housing and the ferrule holder comprises at least one integral recessed portion for receiving and engaging with corresponding projecting portions.

4. The connector of claim 1, wherein the housing comprises a one-piece unitary body.

5. The connector of claim 4, wherein:

the connector further comprises a resilient member for being disposed in the passage for biasing the ferrule assembly towards the second end of the housing;

the ferrule holder has a first end for being disposed toward the first end of the housing, and a second end for retaining the ferrule adjacent the second end of the housing;

the ferrule holder comprises at least first and second radial projections spaced apart from one another in a circumferential direction about the ferrule holder; and

the passage comprises corresponding recessed portions extending radially outwardly from the passage for receiving and retaining the radial projections therein.

6. The connector of claim 5, wherein:

the passage, adjacent the second end of the housing, defines a first internal dimension, and the recessed portions define a second internal dimension greater than the first internal dimension;

the radial projections comprise flanges integral with the ferrule holder and extending radially outwardly adjacent the second end of the ferrule holder to define a first flange position, the flanges in the first flange position define a distance greater than the first internal dimension and corresponding substantially to the second internal dimension;

the flanges are radially inwardly displaceable from the first flange position to a second flange position and have a resilience for returning to the first flange position from the second flange position, the flanges in the second flange position define a distance less than the first internal dimension for insertion of the ferrule holder into and along at least a portion of the passage; and

the flanges are configured for resiliently returning from the second flange position towards the first flange position within the passage upon insertion into the passage and encountering the recessed portions within the passage.

7. The connector of claim 6, wherein:

the passage comprises a first cylindrical passage portion adjacent the first end of the housing and a second cylindrical passage portion adjacent the second end of the housing, the first cylindrical passage portion comprises a first cylindrical wall defining a first diameter, the second cylindrical passage portion comprises a second cylindrical wall defining a second diameter of the first internal dimension, the first diameter being less than the second diameter, and the passage comprises a first spring seat extending radially outwardly from the first cylindrical wall to the second cylindrical wall;

the ferrule holder comprises a first body portion for being disposed in the first cylindrical passage portion and a second body portion for being disposed within the second cylindrical passage portion, the first body portion having a third diameter less than the first diameter, the second body portion having a fourth diameter greater than the first and third diameters and less than the second diameter, and the ferrule holder comprises a second spring seat extending radially outwardly from the first body portion to the second body portion;

the resilient member comprises a spring for being disposed around the first body portion for engagement between the first spring seat and the second spring seat; and

the second body portion comprises a substantially cylindrical wall comprising the flanges.

8. The connector of claim 7, wherein:

the first and second radial projections comprise first and second flanges spaced apart 180°

from one another in a circumferential direction about the ferrule holder;

the corresponding recessed portions comprise openings extending through the housing from the second cylindrical wall to an exterior of the housing, the openings being defined by a perimetrical wall and at least a first portion of the perimetrical wall is disposed towards the second end of the housing;

the ferrule holder is insertable into the passage in a first longitudinal direction to compress the spring between the first and second spring seats, the spring being for biasing the ferrule holder in a second longitudinal direction opposite the first longitudinal direction;

the first and second flanges are configured to be radially displaceable from the first flange position to the second flange position upon insertion into the passage in the first direction; and

the first and second flanges are configured for engaging the first perimetrical wall portions upon movement of the ferrule holder within the passage in the second longitudinal direction under bias of the spring.

9. The connector of claim 8, wherein the first and second flanges have a circumferential dimension and the corresponding recesses have a circumferential dimension, and the circumferential dimension of the flanges and the circumferential dimension of the corresponding recesses are configured with respect to one another for preventing rotation of the ferrule holder within the housing when the ferrule holder is inserted into the housing and the flanges are disposed in the recesses.

10. The connector of claim 5, wherein:

the passage, adjacent the first end of the housing, defines a first internal dimension, and the recessed portions define a second internal dimension greater than the first internal dimension;

the first end of the ferrule holder comprises at least first and second axially extending arms spaced radially from one another, each of the arms having a first end integral with the ferrule holder and a second end disposed axially away from the first end, the radial projections extending radially outwardly adjacent the second end, and the axial arms having a first position wherein the projections define an external dimension greater than the first internal dimension and corresponding substantially to the second internal dimension;

the axially extending arms are radially inwardly displaceable from the first position to a second position and have a resilience for returning to the first position from the second position, the projections in the second arm position define a distance less than the first internal dimension for insertion of the first end of the ferrule holder into and along at least a portion of the passage; and

the axially extending arms are configured for resiliently returning from the second position towards the first position within the passage upon insertion into the passage and the projections encountering the recessed portions.

11. The connector of claim 10, wherein:

the passage comprises a first cylindrical passage portion adjacent the first end of the housing and a second cylindrical passage portion adjacent the second end of the housing, the first cylindrical passage portion comprises a first cylindrical wall defining a first diameter of the first internal dimension, the second cylindrical passage portion comprises a second cylindrical wall defining a second diameter greater than the first diameter, the first diameter being less than the second diameter, and the passage comprises a first spring seat extending radially outwardly from the first cylindrical wall to the second cylindrical wall;

the ferrule holder comprises a first body portion for being disposed in the first cylindrical passage portion and a second body portion for being disposed within the second cylindrical passage portion, the first body portion having a third diameter less than the first diameter, the second body portion having a fourth diameter greater than the first and third diameters and less than the second diameter, and the ferrule holder comprises a second spring seat extending radially outwardly from the first body portion to the second body portion; and

the resilient member comprises a spring for being disposed around the first body portion for engagement between the first spring seat and the second spring seat.

12. The connector of claim 11, wherein:

the at least first and second axially extending arms comprise first, second, third and fourth axially extending arms disposed at about 90°

from an adjacent arm in a circumferential direction about the ferrule holder;

the corresponding recessed portions comprise one of;

an annular enlargement of the first cylindrical passage portion adjacent the first end of the housing, the annular enlargement defining a ring-shaped surface disposed away from the first housing end towards the second end of the housing; and

an end surface of the first housing end, the end surface defining a ring-shaped surface;

the first end of the ferrule holder is insertable into the passage in a first longitudinal direction to compress the spring between the first and second spring seats, the spring being for biasing the ferrule holder in a second longitudinal direction opposite the first longitudinal direction;

the first, second, third and fourth axially extending arms are configured to be radially displaceable from the first position to the second position upon insertion into the passage in the first direction; and

the projections of the first, second, third and fourth axially extending arms are configured for engaging the ring-shaped surface upon movement of the ferrule holder within the passage in the second longitudinal direction under bias of the spring.

13. The connector of claim 12, wherein one of the ferrule holder and the housing comprises an additional radial projection, and the other of the ferrule holder and the housing comprises a longitudinal slot for receiving the additional radial projection therein upon insertion of the ferrule holder into the passage to prevent rotational movement of the ferrule body within the passage.

14. The connector of claim 1, wherein:

the ferrule holder is insertable into the passage through the second end of the housing in a first longitudinal direction; and

the housing comprises a retainer for being inserted through at least a portion of the housing to block at least a portion of the passage to retain the ferrule holder in the passage after insertion of the ferrule holder into the passage through the second end of the housing.

15. The connector of claim 14, further comprising:

a resilient member for biasing the ferrule holder in the passage towards the second end of the housing; and

the retainer being configured for retaining the ferrule holder in the passage in opposition to the biasing of the resilient member after insertion of the ferrule holder into the passage.

16. The connector of claim 15, wherein:

the retainer comprises a U-shaped clip having a base portion with spaced apart legs extending from the base portion;

the housing comprises a slot for receipt of the clip therein; and

the spaced apart legs for being inserted into the slot with the ferrule of the ferrule assembly located therebetween, the legs being disposed for retaining the ferrule holder in the passage in opposition to the biasing of the resilient member.

17. The connector of claim 16, wherein each leg of the clip has a tip portion disposed away from the base of the clip, the tip portions having an outwardly disposed projection extending laterally away from the corresponding tip for engaging with corresponding recesses of the slot to retain the clip in the slot, and each projection having a laterally outward end disposed away from the corresponding tip portion.

18. The connector of claim 17, wherein:

the spaced apart legs in a first position define a first distance between the laterally outward ends of the tip portions, and the legs are resiliently displaceable in a direction towards one another to a second position wherein the laterally outward ends of the tip portions are disposed a second distance from one another, the second distance being less than the first distance; and

the slot comprises;

an opening in a surface of the housing, a bottom spaced apart from the opening, and first and second ends spaced apart and defining a slot length;

a depth dimension into the housing extending from the opening to the bottom of the slot and corresponding to a length of the clip from the base of the clip to the tip portion; and

each slot end comprises an outwardly disposed recess adjacent the bottom of the slot and defining an edge for engaging with the projection of the tip portion, wherein the slot has a first length dimension extending from the opening to the edge and corresponding to the second distance to displace the legs from the first position to the second position upon insertion of the clip into the slot, and the slot has a second length dimension at the recesses corresponding to the second distance for return of the legs from the second position to the first position when the projections enter the recesses to engage the projections with the edges.

19. The connector of claim 18, wherein:

the ferrule holder comprises;

a first end for retaining the ferrule therein and a second end opposite the first end for being inserted into the passage through the second end of the housing; and

an outer peripheral surface having a longitudinal slot disposed therein extending in a direction from the first end to the second end; and

the clip comprises a projection for engaging with the longitudinal slot of the ferrule holder for preventing rotation of the ferrule holder within the passage.

20. The connector of claim 19, wherein:

the base and legs of the clip define a plane;

the clip base comprises the projection; and

the projection extends from the base in a direction transverse to the plane of the clip.

21. A one-piece housing for an optical fiber connector, the connector having a ferrule assembly for being movably disposed within the housing under bias of a resilient member, and the housing comprising:

a one-piece unitary body having a first end and a second end opposite the first end;

a longitudinal passage extending from the first end to the second end for receipt of the ferrule assembly therein; and

at least one of the body and the ferrule assembly comprising a portion for engaging the other of the housing and the ferrule assembly for retaining the ferrule assembly within the passage in opposition to the bias of the resilient member.

22. The housing of claim 21, wherein the portion for engaging comprises at least one integral projecting portion of the one of the housing and the ferrule holder, and the other of the housing and the ferrule holder comprises at least one recessed portion for receiving and engaging with corresponding projecting portions.

23. The housing of claim 22, wherein the housing comprises the at least one recessed portion disposed within the passage and extending radially outwardly from the passage for receiving and retaining radial projections of a ferrule holder therein.