JP2508072Y2 - Optical semiconductor receptacle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an optical semiconductor receptacle used for an optical LAN or the like, and particularly when connecting an optical fiber, when the ferrule of the optical fiber is inserted into the receptacle, The present invention relates to an optical semiconductor receptacle in which the position of the optical axis center is constant with respect to the housing.

[Prior Art] FIGS. 4 to 6 are sectional views showing an example of a conventional optical semiconductor receptacle. In the figure, 1 is a housing, 2
Is coupled with a female screw provided on a connector (not shown) for connecting an optical fiber with a male screw provided on the housing 1. Reference numeral 3 is a hole for inserting a holder portion (hereinafter referred to as a ferrule) provided in the connector for connection into the split sleeve 5. A dummy ferrule 4 is press-fitted into the housing 1, and a split sleeve 5 is elastically fitted and held in the dummy ferrule. The split sleeve 5 is made of a material such as ceramics or metal. Reference numeral 6 denotes a wall for positioning the ferrule in the optical axis direction, which is pressed by a spring provided on the connector. Reference numeral 7 is a light passage hole provided in the dummy ferrule 4. A focusing lens 8 is inserted into the light passage hole 10 provided in the cylindrical body 9 and fixed to the cylindrical body 9 by the solder injected from the pore 11. Reference numeral 12 is an optical semiconductor assembly such as an optical semiconductor laser assembly (hereinafter referred to as LD), which is press-fitted and fixed to the cylindrical body 9 by using a screw ring 13. Reference numeral 14 is this LD cylinder assembly, and 15 is a housing assembly, both of which are joined by a joint surface 16 and optically coupled.

[Problems to be Solved by the Invention] In the structure as described above, the outer diameter of the ferrule to be inserted into the hole 3 must match the outer diameter of the dummy ferrule. Since the outer diameters are not constant and there are errors like the ferrules 30 and 31 shown in FIGS. 6 and 6, the center line of the ferrules 30 and 31 shown by the solid line when the ferrules 30 and 31 are fitted to the split sleeve 5 Not only does the center of the optical axis of the ferrule not be at a fixed position with respect to the dummy ferrule 4 due to the misalignment caused by a distance e from a, the inserted ferrule is likely to tilt. Therefore, the conventional optical semiconductor receptacle has a problem that the optical coupling efficiency changes for each ferrule used or each time the ferrule is mounted.

[Means for Solving the Problems] In order to solve the above problems, in the optical semiconductor receptacle of the present invention, the outer diameter of the inserted ferrule does not match the outer diameter of the dummy ferrule that has caused the conventional problems. Focusing on the fact that it does not occur and the tendency to tilt, the split sleeve is configured without elastically fitting to the dummy ferrule as in the conventional case. Therefore, a part of the split sleeve is fixed to the inner wall of the housing while the outer diameter of the split sleeve is elastically deformable and smaller than the inner diameter of the housing.
Further, in order to simplify the assembling process, the split sleeve is configured to be fixed only by press fitting it into the housing. For this purpose, a projection is provided on the outer wall of the split sleeve, and a long groove that fits with the projection is provided in the housing inner wall corresponding to the projection in the split sleeve press-fitting direction.

[Operation] As described above, in the optical semiconductor receptacle according to the present invention, a protrusion is provided on the outer wall of the split sleeve while the outer diameter of the split sleeve is elastically deformable and is smaller than the inner diameter of the housing. By providing the long groove that fits with the projection in the split sleeve press-fitting direction, the optical axis center of the ferrule can be reliably held at a fixed position and a fixed angle with respect to the housing even if there is an error in the outer diameter of the ferrule to be inserted.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a vertical sectional view of the optical semiconductor receptacle, and FIG. 2 is a front view of the optical semiconductor receptacle. FIG. 3 is a perspective view of the split sleeve. It should be noted that the same parts as those in the conventional example are given corresponding numbers. The split sleeve 50 has a pigeon-tail-shaped protrusion 51 on the outer wall opposite to the split portion 52,
The housing 1a is provided with a long groove 22 having a cross-sectional shape that press-fits with the protrusion 51 in the press-fitting direction of the split sleeve 50 on the inner wall of the housing 1a. When the optical semiconductor receptacle is assembled, the protrusion 51 and the long groove 22 are aligned with each other. Split sleeve in housing 1a
The 50 is press-fitted until the tip of the protrusion 51 contacts the wall 6. The split sleeve 50 opens when the ferrule is inserted according to the diameter of the ferrule into which the split portion 52 is inserted, so that the split sleeve 50 can be elastically deformed in the outer radial direction and the gaps 17 and 18 with the inner wall of the housing 1a and the groove having an arc-shaped cross section provided inside. By 53, the ferrule can be inserted into the ferrule insertion hole 3a in a wide range from a ferrule with a small outer diameter to a ferrule with a large outer diameter. Further, the split sleeve 50 is provided with small protrusions 54a, 54b, 54c for guiding the position of a ferrule holder (not shown), which facilitates the connection of the ferrule. It should be noted that the split sleeve 50 is made of ceramics so that it is easy to insert the ferrule,
And it is hard to hurt.

Further, in the above-described embodiment, the optical semiconductor receptacle is configured by using the LD cylindrical body assembly 14, but instead of the LD cylindrical body assembly 14, it is composed of a light receiving element assembly (referred to as PD) using a light receiving element such as a PIN photodiode. An optical semiconductor receptacle may be configured as the PD cylinder assembly.

[Effects of the Invention] With the configuration as described above, the optical semiconductor receptacle of the present invention is positioned in the optical axis direction when the ferrule pushed out by the spring provided in the optical connector comes into contact with the wall in the pushing direction, and the splitting is performed. Since the elastic force of the sleeve holds the housing at a fixed position and at a fixed angle, it is possible to prevent variations in optical coupling between connectors or each mounting, and to realize stable optical coupling.

[Brief description of drawings]

1 to 3 illustrate an embodiment of the present invention.
1 is a longitudinal sectional view of an optical semiconductor receptacle, FIG. 2 is a front view of the optical semiconductor receptacle, and FIG. 3 is a perspective view of a split sleeve. 4 to 6 are explanatory views of a conventional example. 1a: Housing 3a: Ferrule insertion hole 6: Wall 8: Focusing lens 12: Laser diode assembly 14: LD cylinder assembly 15: Housing assembly 16: Bonding surface 17,18: Gap 22: Long groove 50: Split sleeve 51: Pigeon tail Shaped protrusion 52: Split part 53: Groove

Claims (2)

(57) [Scope of utility model registration request] 1. A cylindrical body assembly in which a semiconductor laser assembly or a light receiving element assembly and a focusing lens are housed and fixed on an optical axis, and a split sleeve elastically fitted when a ferrule of an optical fiber is inserted are elastically deformable in an outer diameter direction. In an optical semiconductor receptacle formed by coupling a housing assembly press-fitted and fixed in the optical axis direction, a part of the outer wall of the split sleeve is fixed to the inner wall of the housing assembly to hold the inserted ferrule in a fixed position. An optical semiconductor receptacle characterized in that 2. A split sleeve, wherein a projection is provided on an outer wall of the split sleeve, and a long groove for fitting with the projection is provided on an inner wall of the housing facing the projection in a split sleeve press-fitting direction so that the projection and the long groove are aligned with each other. The optical semiconductor according to claim 1, wherein the split sleeve is fixed to the inner wall of the housing by fitting the protrusion into the long groove when the and are pressed into the housing. Receptacle.