KR101687740B1 - Beam expanded optical connector - Google Patents

Beam expanded optical connector Download PDF

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Publication number
KR101687740B1
KR101687740B1 KR1020150092508A KR20150092508A KR101687740B1 KR 101687740 B1 KR101687740 B1 KR 101687740B1 KR 1020150092508 A KR1020150092508 A KR 1020150092508A KR 20150092508 A KR20150092508 A KR 20150092508A KR 101687740 B1 KR101687740 B1 KR 101687740B1
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KR
South Korea
Prior art keywords
ferrule
lens
mold
disposed
housing
Prior art date
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KR1020150092508A
Other languages
Korean (ko)
Inventor
양진규
정기현
Original Assignee
공주대학교 산학협력단
주식회사 쓰리엘시스템
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Application filed by 공주대학교 산학협력단, 주식회사 쓰리엘시스템 filed Critical 공주대학교 산학협력단
Priority to KR1020150092508A priority Critical patent/KR101687740B1/en
Application granted granted Critical
Publication of KR101687740B1 publication Critical patent/KR101687740B1/en

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3853—Lens inside the ferrule
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

The present invention relates to a beam expanded optical connector using a mold lens. The present invention includes: a first body having at least one first ferrule formed inside; a second body having at least one second ferrule formed inside and connected to the first body; a first lens housing disposed inside the first body and connected to the first ferrule; a second lens housing disposed inside the second body and connected to the second ferrule; a first mold lens unit disposed on the first lens housing and configure to extend the optical signal of the first ferrule; and a second mold lens unit disposed on the second lens housing and configured to collect the extended optical signal to the second ferrule. The first mold lens unit and the second mold lens unit are faced with each other.

Description

[0001] The present invention relates to a beam extended optical connector using a mold lens,

The present invention relates to a beam expanding optical connector using a mold lens.

The optical connector can be classified into a form, a coupling method, and the like.

The classification according to the type is as follows: Subscriber Connector (SC), Ferrule Connector (FC), Straight Tip (ST), LC (Lucent Connector), MTRJ (Miniature Unit) have.

Classification according to the bonding method is called Physical Contact, which polishes the optical fiber end with a soft curved surface; PC, Angled Physical Contact which polishes the end of the ramp at 8 degrees with very small reflection loss; APC, Beam Expanded Expanded Beam; EB and so on.

In the case of the contact type (PC) connector, the ends of the ferrules connected to each other are in contact with each other, and when repeatedly engaged and disengaged, scratches are generated on the contact surfaces and foreign matters such as dust and moisture are deposited. It is not suitable for outdoor communication systems that are exposed to various environments.

Unlike ordinary optical connectors, beam-expanding (EB) optical connectors are mainly used in outdoor environments and are not buried in the ground but are exposed directly on the ground. Such a beam-expanding optical connector is less affected by temperature and humidity changes, and is easy to clean even if it is contaminated with dust or muddy water, and is less influenced by optical transmission performance.

However, since the beam-expanding optical connector arranges a pair of lenses at intervals between the ferrules to be connected, the precision of the housing and the lens for fixing the lens must be very high. If the precision is not high, the center of the first ferrule and the center of the second ferrule are shifted and the light efficiency may be lowered. In addition, the lens had to be formed into a ball shape, and the connector had to be enlarged to fit the diameter of the ball.

Japanese Patent Application Laid-Open No. 10-1507376 (Feb. 25, 2015)

The present invention provides a technique capable of positioning the centers of the first and second ferrules on the same line without any deviation without increasing the precision of the lens housing.

The present invention provides a technique that can prevent damage to an optical connector even in a variety of outdoor environmental changes and shocks.

The beam-expanding optical connector using the mold lens according to an embodiment of the present invention may include a first body in which at least one first ferrule can be disposed, at least one second ferrule may be disposed inside the first body, A second body coupled to the first body, a first lens housing disposed within the first body, the first lens housing being connectable to the first ferrule, a second lens housing disposed within the second body, A second lens housing disposed in the first lens housing and extending a light signal of the first ferrule and a second lens housing disposed in the second lens housing, And a second mold lens portion for transferring the molten resin to the ferrule, wherein the first mold lens portion and the second mold lens portion face each other at an interval.

Wherein the first lens housing and the second lens housing each have a pair of fitting grooves formed at the same position and the beam expanding type optical connector using the mold lens further includes a pair of fitting pins inserted into the fitting groove When the fitting pin is inserted into the fitting groove, the first ferrule, the first mold lens portion, the second mold lens portion, and the second ferrule may be located on the same line.

The first lens housing may have a base groove in which the first mold lens portion is disposed and an insertion hole into which a portion of the first ferrule is inserted, and the base groove and the insertion hole may be connected.

The first lens housing may have an injection groove connected to the base groove.

The first mold lens unit may include a base disposed in the base groove and a lens formed on one side of the base and the center of which coincides with the center of the first ferrule, have.

The first mold lens portion and the first ferrule may be spaced apart from each other by 0.931 mm to 1.241 mm.

The beam-expanding optical connector using the mold lens may further include a fixing part located inside the first body and fixing the first ferrule.

According to the embodiment of the present invention, the beam-expanding type optical connector using the mold lens is constructed such that the first ferrule and the second ferrule are not misaligned The centers may be collinear. Therefore, it is easy to align the optical signals, and the optical signals can be stably transmitted even under various environmental changes and shocks.

According to the embodiment of the present invention, the lens housing does not need to be super-precision machined by using the super-precision mold lens unit. When a ball lens is used, an assembly (lens housing) for coupling a lens and a ferrule must be super-precision machined. However, in this embodiment, alignment between the lens and the ferrule can be accurately performed by using the super- Therefore, the manufacturing accuracy of the lens housing can be lowered and the manufacturing cost of the lens housing can be lowered.

According to the embodiments of the present invention, since the bases of the first and second mold lens units are stably fixed to the base groove, the alignment of the optical signals can be reproducibly performed.

According to the embodiment of the present invention, an ordinary person who is not an expert can easily separate and clean contaminated portions without special tools or devices in the field, and can easily reassemble to maintain the alignment state. The ferrule is not damaged.

1 is a perspective view illustrating a beam-expanding optical connector using a mold lens according to an embodiment of the present invention;
Fig. 2 is an exploded perspective view of Fig. 1; Fig.
Figure 3 is a side view of the first body of Figure 2;
4 is a sectional view taken along the line IV-IV in Fig.
5 is a sectional view taken along the line V-V in Fig.
Fig. 6 is an enlarged view of the first and second mold lens portions of Fig. 4; Fig.
FIG. 7 is a graph showing the light loss that occurs when the optical connector is coupled at an angle; FIG.
8 is a graph showing the light loss caused when the ferrule center is shifted in the lateral direction.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Like parts are designated with like reference numerals throughout the specification.

A beam-expanding optical connector using a mold lens according to an embodiment of the present invention will now be described with reference to FIGS. 1 to 6. FIG.

FIG. 1 is a perspective view of a beam-expanding optical connector using a mold lens according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of FIG. 1, FIG. 3 is a side view showing the first body of FIG. FIG. 5 is a sectional view taken along the line V-V in FIG. 1, and FIG. 6 is an enlarged view of the first and second mold lens portions in FIG.

1 to 6, a beam-expanding optical connector 100 using a mold lens according to the present embodiment includes a first ferrule 1 to which a first cable 1a including optical fibers is connected and optical fibers The second ferrule 2 to which the cable 2a is connected. The first ferrule (1) and the second ferrule (2) are disposed inside the beam-expanding optical connector (100) using the mold lens and face each other with a gap therebetween on the same line.

The first lens housing 40 and the second lens housing 50. The first mold lens unit 60 includes a first body 10, a second body 20, a clamp 30, a first lens housing 40, a second lens housing 50, 70, a joining member B, and a fixing portion E.

The first body 10 and the second body 20 form an outer shape of the beam-expanding optical connector 100 using a mold lens. The interior of the first body 10 and the second body 20 is empty. The inside can be partitioned into the housing spaces 11 and 21 and the ferrule spaces 12 and 22. The diameters of the housing spaces 11 and 21 are larger than the diameters of the ferrule spaces 12 and 22. The ends 13 and 23 are formed at the boundary between the housing spaces 11 and 21 and the ferrule spaces 12 and 22 due to the difference in diameter.

The first body 10 and the second body 20 are coupled to each other by the clamp 30. The clamp 30 overlaps the outer circumferential surfaces of the first body 10 and the second body 20. Screws are formed on the circumferential surface where the clamp 30 and the first body 10 are in contact with each other. The first body 10 and the second body 20 can be separated when the clamp 30 is released from the first body 10.

The cross section of the first body 10 and the second body 20 cut from the side is circular. The area pressed by the circular cross-sectional shape when the beam-expanding optical connector 100 using the mold lens is pressed (under pressure) by the external requirements of the vehicle, a person, etc., can be minimized. Therefore, it is possible to protect the first ferrule (1) and the second ferrule (2) from external requirements by having a strong structure against external impact, pressure and the like.

The first body 10 and the second body 20 may be made of polyvinyl chloride (PVC). Or made of metal such as aluminum, stainless steel, or copper alloy.

A base groove 42 and an injection groove 43 are formed on one surface of the first lens housing 40 and an insertion hole 44 is formed on the other surface. The base groove 42 and the injection groove 43 are connected.

A plurality of insertion holes 44 are formed at intervals. When viewed from the side of the first lens housing 40, the base groove 42 is formed in a rectangular shape, and the insertion hole 44 is formed in a circular shape. The base groove 42 and the insertion hole 44 are connected.

The first lens housing (40) is disposed in the housing space (42). The outer circumferential surface of the first lens housing 40 is in contact with the circumferential surface of the base groove 42 and the outer circumferential surface of the first lens housing 40 is in contact with the step 13. [

The first lens housing 40 is fixed to the first body 10 by a plurality of engaging members B. The engaging member B penetrates from one surface of the first lens housing 40 in the other surface direction and its end is fastened to the end 13. The joint member B is formed of a bolt, and the head portion of the bolt does not protrude outside the first lens housing 40.

On one surface of the first lens housing 40, a fitting groove 45 to which one side of the fitting pin P is coupled is formed.

The first lens housing 40 can be made of a metal such as aluminum, stainless steel, or copper alloy, which has a certain degree of strength, while using a material that ensures precision within a manufacturing tolerance range. Only the base groove 42 and the insertion hole 44 of the first lens housing 40 can be precisely processed in units of millimeters.

The second lens housing 50 is disposed in the housing space 21 of the second body 20 and faces the first lens housing 40 on the same line. The second lens housing 50 is formed with a base groove 52, an injection groove 53, an insertion hole 54, and a fitting groove 55.

An O-ring 56 is coupled to the outer peripheral surface of the second lens housing 50 along the circumferential direction. The O-ring 56 can be pressed between the second lens housing 50 and the peripheral surface of the housing space 21 when the second lens housing 50 is disposed in the housing space 21. [ The O-ring 56 fixes the second lens housing 50 to the second body 20 so that the second lens housing 50 does not move so that the second lens housing 50 can be aligned with the first lens housing 40.

The fitting grooves 55 of the second lens housing 50 are formed at positions corresponding to the fitting grooves 45 of the first lens housing 40. [ The other side of the fitting pin P is engaged with the fitting groove 55 when the first body 10 and the second body 20 are engaged. The base groove 42 and the insertion hole 44 of the first lens housing 40 and the base groove 52 and the insertion hole 54 of the second lens housing 50 are aligned on the same line Located.

Since the detailed structure of the second lens housing 50 is the same as that of the first lens housing 40, a duplicated description will be omitted.

The first mold lens portion 60 is disposed in the base groove 42. The first mold lens portion 60 includes a base 61 and a lens 62. The first mold lens portion 60 is formed in the same shape as the base groove 42.

On one side of the base 61, lenses 62 are formed at intervals along the longitudinal direction. The lens 62 may be spherical or aspherical, so that the aberration can be minimized.

The center distance between the neighboring lenses 62 is equal to the distance between the centers of neighboring first ferrules 1. 2, the lenses 62 are arranged in one row in the base 61, but they may be arranged in a plurality of rows. The number and arrangement of the lenses 62 can be changed according to the design conditions of the beam-expanding optical connector 100 using the mold lens.

The other surface of the base 61 is formed in a flat surface. The circumferential surface of the base (61) is in contact with the circumferential surface of the base groove (42). The base 61 may be fixed by an EPOXY or the like injected between the base 61 and the first lens housing 40 through the injection groove 43.

The thickness including the base 61 and the lens 62 does not exceed the depth of the base groove 42. The end of the lens 62 that is farthest from the one surface of the base 61 does not protrude outside the first lens housing 40.

The base 61 and the lens 62 are integrally processed using a mold MOLD and are super-precision processed in nm units.

The first mold lens unit 60 may be made of glass for molding, plastic, or synthetic resin. The surface of the first mold lens unit 60 may be anti-reflection (AR) coated to prevent reflection of the optical signal.

The second mold lens unit 70 is disposed in the base groove 52 of the second lens housing 50 and faces the second mold lens unit 70 with a gap therebetween. The second mold lens portion 70 includes a base 71 and a lens 72. Since the detailed structure of the second mold lens unit 70 is the same as that of the first mold lens unit 60, a duplicated description will be omitted.

The center of the lens 62 and the center of the lens 72 are shifted by the precisely machined first and second lens housings 40 and 50 and the first and second molded lens portions 60 and 70, And are located on the same line. Also, the centers of the lenses 62 and 72 and the centers of the first and second ferrules 1 and 2 are not shifted but are located on the same line.

The ferrule 12 of the first body 10 is provided with a first ferrule 1 in which an optical fiber (not shown) is disposed at the center of the ferrule 12. The cable 1a is drawn out of the first body 10 through a hole connected to the ferrule space 12. [

The first ferrule 1 is fixed by a fixing portion E such as silicone so as not to move. The cable la located in the ferrule space 12 is also fixed to the fixing portion E. [ At least a portion of one side of the first ferrule (1) is inserted into the insertion hole (44). The other surfaces of the first ferrule 1 and the base 61 are apart from each other by an interval of 0.931 mm to 1.241 mm. The center of the precision machined insertion hole 44 and the center of the first ferrule 1 do not deviate but are located on the same line. Therefore, a vertical error between the lens 62 and the first ferrule 1 does not occur. The optical fiber of the first ferrule (1) irradiates the optical signal toward the lens (62). The lens 62 expands the optical signal into parallel light within a predetermined range and irradiates the optical signal toward the lens 72.

The second ferrule 2 is disposed in the ferrule space 22 of the second body 20 and at least a portion of the second ferrule 2 is inserted into the insertion hole 54. The center of the precision machined insertion hole 54 and the center of the second ferrule 2 are not shifted but are located on the same line. The center of the second ferrule 2 and the center of the lens 72 are also located on the same line so that lateral misalignment between the lens 72 and the second ferrule 2 is minimized.

If the centers of the first ferrule 1, the lens 62, the lens 72 and the second ferrule 2 are located on the same line without being shifted, the optical signal can be transmitted without being lost.

As shown in Fig. 7, one ferrule and one lens are vertically aligned on a virtual extension line connecting their centers, and the other ferrule and lens are vertically aligned on an imaginary extension line to which their centers are connected, It can be seen that the optical signal efficiency is lowered due to the deviation of the angle. However, in the present embodiment, the first lens housing 40 and the second lens housing 50 are not misaligned by the fitting pin P, and the first ferrule 1, the first mold lens portion 60, 2 and the second mold lens portions 70 are not shifted, the optical signal efficiency is not lowered.

Further, as shown in Fig. 8, one of the ferrules and the lens is vertically aligned on a virtual extension line connecting the centers thereof, and the other lens is vertically aligned on a virtual extension line connecting the centers thereof, However, when the center of the ferrule is vertically aligned off the extension line, it can be seen that the light transmission efficiency decreases as the ferrule escapes. However, in this embodiment, since the first ferrule 1, the lenses 62 and 72, and the second ferrule 2 are not shifted, the light transmission efficiency is not lowered.

Therefore, the beam-expanding type optical connector using the mold lens according to the present embodiment can be transmitted without any loss of light even when shock, pressure, or the like is adhered to the outside due to external requirements or contaminants adhere to a part of the lens, Can be utilized.

Other embodiments of the present invention have most of the components of the embodiment described with reference to Figs. However, this embodiment further includes tempered glass (not shown). The tempered glass is disposed in front of the first mold lens unit 60 and the second mold lens unit 70 and disposed at the positions of the lenses 62 and 72 when the first body 10 and the second body 20 are separated, Protect foreign matter such as moisture from entering. In other respects, the configurations of the embodiments of Figs. 1 to 6 may be applied as they are.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, Of the right.

1: first ferrule 2: second ferrule
100: Beam expandable optical connector using molded lens
10: first body 20: second body
11, 21: housing space 12, 22: ferrule space
13, 23: only 30: clamp
40: first lens housing 50: second lens housing
42, 52: base groove 43, 53: injection groove
44, 54: insertion hole 45, 55:
56: O-ring 60: First mold lens part
70: second mold lens unit 61, 71: base
62, 72: lens B: coupling member
E: fixing portion P: fitting pin

Claims (7)

A first body in which at least one first ferrule may be disposed,
At least one second ferrule may be disposed therein, a second body coupled to the first body,
A first lens housing disposed within the first body and connectable with the first ferrule,
A second lens housing disposed within the second body and connectable with the second ferrule,
A first mold lens unit disposed in the first lens housing and extending the optical signal of the first ferrule,
A second mold lens unit disposed in the second lens housing for collecting the expanded optical signal and transmitting the optical signal to the second ferrule,
Lt; / RTI >
Wherein the first lens housing is formed with a base groove in which the first mold lens portion is disposed and an insertion hole into which a part of the first ferrule is inserted, the base groove and the insertion hole being connected to each other, The housing is provided with an injection groove connected to the base groove
A beam - expanding optical connector using a mold lens. The method of claim 1,
Wherein the first lens housing and the second lens housing each have a pair of fitting grooves formed at the same positions and further include a pair of fitting pins inserted into the fitting groove, The centers of the first ferrule, the first mold lens portion, the second mold lens portion, and the second ferrule are positioned on the same line
A beam - expanding optical connector using a mold lens. The method of claim 1,
Wherein the first mold lens portion and the second mold lens portion face each other with a gap therebetween. delete A first body in which at least one first ferrule may be disposed,
At least one second ferrule may be disposed therein, a second body coupled to the first body,
A first lens housing disposed within the first body and connectable with the first ferrule,
A second lens housing disposed within the second body, the second lens housing being connectable with the second ferrule,
A first mold lens unit disposed in the first lens housing and extending the optical signal of the first ferrule,
And a second mold lens unit disposed in the second lens housing for collecting the expanded optical signal and transmitting the optical signal to the second ferrule,
Lt; / RTI >
The first mold lens portion and the second mold lens portion face each other with an interval, and the first lens housing has a base groove in which the first mold lens portion is disposed and an insertion hole into which a portion of the first ferrule is inserted Wherein the base groove and the insertion hole are connected to each other,
Wherein the first mold lens unit comprises:
A base disposed in the base groove,
And a center of the lens is coincident with the center of the first ferrule,
/ RTI >
The lens may be spherical or aspherical
A beam - expanding optical connector using a mold lens. The method of claim 5,
Wherein the second face of the base and the first ferrule are spaced apart at intervals of 0.931 mm to 1.241 mm. The method of claim 1,
Further comprising: a fixing portion located inside the first body and fixing the first ferrule.
KR1020150092508A 2015-06-29 2015-06-29 Beam expanded optical connector KR101687740B1 (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130108712A (en) * 2012-03-26 2013-10-07 (주)포스텍 Mil-std-38999 hybrid cable connector with misalignment compensation structure for optical fiber
KR20150006466A (en) * 2012-06-01 2015-01-16 타이코 일렉트로닉스 코포레이션 Expanded-beam connector with molded lens
KR101507376B1 (en) 2013-07-08 2015-03-31 엑스빔테크 주식회사 Expanded beam interconnects based on compound-lens

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130108712A (en) * 2012-03-26 2013-10-07 (주)포스텍 Mil-std-38999 hybrid cable connector with misalignment compensation structure for optical fiber
KR20150006466A (en) * 2012-06-01 2015-01-16 타이코 일렉트로닉스 코포레이션 Expanded-beam connector with molded lens
KR101507376B1 (en) 2013-07-08 2015-03-31 엑스빔테크 주식회사 Expanded beam interconnects based on compound-lens

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