阅读说明：本技术 一种提高闭口套管插芯插拔一致性的结构 (Structure for improving plug-in consistency of closed sleeve insertion core ) 是由 金新刚 于 2019-12-10 设计创作，主要内容包括：一种提高闭口套管插拔一致性的结构,包括一个闭口套管和与之配合的光纤插芯,套管侧壁上开有贯通内外壁的通孔,一个压件通过贯穿孔其端部压在插芯侧壁上,压迫插芯紧靠在套管的对侧内壁上。插芯的前端面与压件端部为斜面或弧面接触,插芯每次插拔会将压件端部顶起,同时被压件压迫到套管内壁的同一侧,可保证多次插拔的重复性、一致性。(A structure for improving the consistency of plugging and unplugging a closed sleeve comprises the closed sleeve and an optical fiber insertion core matched with the closed sleeve, wherein the side wall of the sleeve is provided with a through hole penetrating through the inner wall and the outer wall, and a pressing piece is pressed on the side wall of the insertion core through the through hole and presses the insertion core against the inner wall of the opposite side of the sleeve. The front end face of the insertion core is in inclined plane or arc surface contact with the end part of the pressing piece, the end part of the pressing piece can be jacked up by the insertion core during each plugging and unplugging, and meanwhile, the pressing piece presses the same side of the inner wall of the sleeve, so that the repeatability and the consistency of multiple plugging and unplugging can be ensured.)

1. A structure for improving the plug consistency of a closed sleeve comprises the closed sleeve and an optical fiber ferrule matched with the closed sleeve, and is characterized in that: the side wall of the sleeve is provided with a through hole penetrating through the inner wall and the outer wall, and a pressing piece is pressed on the side wall of the insertion core through the end part of the through hole to press the insertion core to be tightly close to the inner wall of the opposite side of the sleeve.

2. The structure for improving the plugging consistency of the closed sleeve as claimed in claim 1, wherein: the peripheral surface of the head of the inserting core is an arc surface or an inclined surface.

3. The structure for improving the plugging consistency of the closed sleeve as claimed in claim 1, wherein: the end of the pressing piece is in a spherical or truncated cone shape, and the spherical or conical peripheral surface is connected with the plane end surface of the top end.

4. The structure for improving the plugging consistency of the closed sleeve as claimed in claim 1, wherein: the pressing piece is a spring thimble and comprises a needle tube and a thimble, and a compression spring is arranged in the needle tube and can make the thimble elastically stretch along the needle tube; the spring thimble is arranged at the through hole on the sleeve wall, and the end part of the spring thimble slightly extends into the sleeve through the through hole to press the inserting core.

5. The structure for improving the plugging consistency of the closed sleeve as claimed in claim 4, wherein: the spring thimble is integrated in the through hole of the sleeve, the through hole of the sleeve replaces the needle tube of the spring thimble, the thimble and the spring are installed in the through hole 13, the upper part is sealed.

6. The structure for improving the plugging consistency of the closed sleeve as claimed in claim 1, wherein: the pressing piece is a pressing pin, the whole body or the end part of the pressing pin is made of flexible materials which can be extruded and deformed, the pressing pin is arranged at the through hole on the wall of the sleeve, and the end part of the pressing pin extends into the sleeve through the through hole to press the inserting core.

7. The structure for improving the plugging consistency of the closed sleeve as claimed in claim 4 or 6, wherein: the spring thimble or the pressing needle is in threaded connection with the sleeve.

8. The structure for improving the plugging consistency of the closed sleeve as claimed in claim 4 or 6, wherein: the spring thimble or the press needle is tightly matched or in interference fit with the through hole on the upper wall of the sleeve.

9. The structure for improving the plugging consistency of the closed sleeve as claimed in claim 1, wherein: the pressing piece is of a spring piece structure, one end of the spring piece is a fixed end and is fixed on the outer wall of the sleeve, and the other end of the spring piece is connected with a pressing head, bends and extends downwards into the through hole to press the ferrule.

Technical Field

The invention belongs to the technical field of optical devices, relates to the matching of a closed sleeve and an optical fiber ferrule, and particularly provides a structure for improving the plugging consistency of the ferrule of the closed sleeve.

Background

In the pluggable optical device, the pluggable design of the optical fiber device is often realized by matching the closed sleeve with the optical fiber ferrule. However, because the ferrule and the closed sleeve are not a tight or interference fit, a gap of several microns is often present. The diameter fiber core of the optical fiber, especially the single mode optical fiber, is very small (the fiber core of the conventional single mode optical fiber is 9 microns), and the gap tolerance of several microns can bring about a serious plugging repeatability problem, so that the multiple plugging consistency of the system has a great difference. For example, the consistency of the coupling loss of each plugging is poor in a pluggable laser, and on some pluggable collimators, the direction angle of a light beam after collimation has a large difference due to the weak position difference of the end face of the optical fiber ferrule, so that the repeatability of an optical fiber system is reduced.

Disclosure of Invention

In order to solve the technical problems, the invention provides a structure which can greatly improve the repeatability of a pluggable device.

Normally, a closed sleeve consists of an inner sleeve (usually but not limited to a ceramic material) and an outer shell (usually but not limited to a metal material), and also has only one sleeve layer. In the present invention, the sleeve is referred to as a single-layer structure or a two-layer structure; in some cases, the length of the housing is greater than the length of the inner casing, and the front portion of the ferrule is suspended in the housing, which is also considered by the present invention as a casing.

A structure for improving the consistency of plugging and unplugging a closed sleeve comprises the closed sleeve and an optical fiber insertion core matched with the closed sleeve, wherein the side wall of the sleeve is provided with a through hole penetrating through the inner wall and the outer wall, and a pressing piece is pressed on the side wall of the insertion core through the through hole and presses the insertion core against the inner wall of the opposite side of the sleeve. The front end face of the insertion core is in inclined plane or arc surface contact with the end part of the pressing piece, the end part of the pressing piece can be jacked up by the insertion core during each plugging and unplugging, and meanwhile, the pressing piece presses the same side of the inner wall of the sleeve, so that the repeatability and the consistency of multiple plugging and unplugging can be ensured.

One proposal of the pressing piece is to adopt a spring thimble in the prior art, and the basic structure comprises a needle tube and a thimble, wherein a compression spring in the needle tube can make the thimble elastically stretch along the needle tube. The spring thimble is installed in through-hole department, and the tip passes through the through-hole and stretches into in the cover pipe slightly to can oppress the lock pin for the degree. The end of the thimble is usually a spherical surface or a conical surface, and can also be designed into a wedge-shaped surface. The thimble is jacked up when the insertion core is inserted, and meanwhile, the insertion core is pressed to the inner wall of the opposite side of the sleeve. The connection between the elastic thimble and the sleeve can be realized by welding, threaded connection and close-fit insertion at the through hole, and a connecting piece can be added.

In another scheme of the pressing piece, a pressing pin is directly adopted for the pressing piece. The pressing needle is made of deformable flexible material wholly or at the end part. The pressing pin slightly extends into the sleeve through the through hole, and the end part of the pressing pin can press the inserting core. The end of the presser pin is usually spherical or conical, and can also be designed into a wedge-shaped surface. The end of the pressing pin is pressed and deformed when the insertion core is inserted, and meanwhile, the insertion core is pressed to the opposite side inner wall of the sleeve. The connection between the pressing pin and the sleeve can be realized by welding, threaded connection and close fit insertion at the through hole, and a connecting piece can be added.

The third scheme of the pressing piece is that the pressing piece adopts a spring piece structure, one end of the spring piece is a fixed end and is fixed on the outer wall of the sleeve, the other end of the spring piece is connected with a pressing head, the pressing head bends and extends downwards into the through hole, and the pressing head slightly extends into the sleeve to the extent that the end part of the pressing head can press the inserting core. The end of the pressure head is usually spherical or conical, and can be designed into a wedge-shaped surface. The pressure head is jacked up when the ferrule is inserted, and meanwhile, the ferrule is pressed to the opposite side inner wall of the sleeve. The connection between the spring plate and the outer wall of the sleeve can be welded, screwed or fixed in other modes.

Preferably, the through hole of the sleeve is positioned near the front end of the insertion direction of the ferrule, and the pressing position is close to the head of the ferrule. Therefore, the friction distance between the inserted core and the end part of the pressing piece can be reduced, and the error caused by axial bending of the inserted core can also be reduced.

In the invention, when the end part of the pressing piece adopts a conical surface or a spherical surface, the end surface of the ferrule forms a slope surface fit with the end part of the pressing piece, so that the head part of the ferrule does not need to be specially designed. However, the disadvantage is that the end of the follower is in point contact with the ferrule side wall, which may be slightly offset to one side and not press the ferrule accurately to the opposite side. One improvement is that the end of the pressing piece is wedge-shaped, so that the end of the pressing piece is in line contact with the side wall of the insertion core, and the pressing direction can be ensured. But the disadvantage is that the mounting direction of the pressing piece needs to be controlled well, so that the edge of the end part of the pressing piece is perpendicular to the axial direction of the inserting core. Another improvement is that the end of the pressing piece is cylindrical and the bottom surface is a plane. Therefore, the end part of the pressing piece is in surface contact with the side wall of the inserting core, so that the pressing direction can be ensured, and the limitation of the installation direction is avoided. But the disadvantage is that the end of the inserting core needs to be designed into a spherical surface or a conical surface to ensure the slope transition between the inserting core and the end of the pressing piece. The most preferred scheme is that the end of the pressing piece is in a spherical frustum shape or a circular frustum shape, namely, the spherical or conical peripheral surface is connected with the plane end surface of the top end. Thus, when the ferrule contacts the end of the pressing piece, the slope surface is transited to the plane surface for contact.

By adopting the technical scheme of the invention, the end part of the pressing piece generates a radial thrust to the insertion core entering the closed sleeve, so that the insertion core can be pushed to the same direction after being inserted every time, and the position accuracy of the insertion core after being inserted every time is improved.

Drawings

FIG. 1 is a sectional view of example 1A of the present invention;

FIG. 2 is a sectional view of example 1B of the present invention;

FIG. 3 is a sectional view of example 1C of the present invention;

FIG. 4 is a perspective and cross-sectional view of an end of a compression element of the present invention;

FIG. 5 is a perspective and cross-sectional view of an alternative construction of an end of a compression element of the present invention;

FIG. 6 is a sectional view of embodiment 2 of the present invention;

FIG. 7 is a sectional view of example 3 of the present invention.

In the figure: 1. the optical fiber pressing piece comprises a sleeve, 11, an inner sleeve, 12, a shell, 13, (on the wall of the sleeve) through holes, 2, an inserting core, 21, an inserting core head, 22, an optical fiber, 3, a spring ejector pin, 31, a spherical end part of a pressing piece, 32, a spherical peripheral surface, 33, a top end plane, 31 ', a circular table end part of the pressing piece, 32 ', a circular table peripheral surface, 33 ', a top end plane, 5, a spring piece pressing piece, 51, 52 and a spring piece pressing piece end part.

Detailed Description

The following detailed description of specific embodiments of the invention is provided in connection with the accompanying drawings. For simplicity and clarity of the drawing, reference numerals are not repeated among the figures for like elements in the various embodiments.