JPH0115043B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an optical branching/combining device, an optical demultiplexing/combining device,
Regarding optical communication receptacles that are essential for optical communication components such as optical switches that are connected to optical fibers, in particular, the receptacle body has a cylindrical lens that converts the emitted light from the optical fiber into parallel light. The present invention relates to an optical communication receptacle that is easy to install.

[Conventional configuration and its problems]

Figure 1 shows a cross section of the optical path in which the emitted light from the end of the fiber passes through a cylindrical lens and becomes parallel light.The cylindrical lens a is located on the optical axis at a distance from the optical fiber b by the focal length of the lens. will be placed in

Conventional optical communication receptacles, when attaching the above-mentioned cylindrical lens to the main body, e.g.
As shown in the figure, a lens unit is constructed by fitting and fixing a disc 2 having a lens loose fitting hole 2a to the outer periphery of a cylindrical lens 1, and in order to align the optical axes of the lens and optical fiber. Using a resilient guide plate 3 having a hole 3a slightly larger than the lens diameter, insert the lens 1 into the hole 3a of the guide plate 3.
The optical axes are aligned by inserting the guide plate 3 and moving the guide plate 3.

However, in this case, the lens 1 is
In order to guide the lens 1, it is necessary to protrude from the disc 2 by at least the thickness of the guide plate 3, and when inserting the lens 1 into the hole 3a of the guide plate 3, the plate surface will come into contact with the lens end surface and the lens There is a risk of damaging the end face, there is a risk of the edge of the lens 1 being chipped when the lens 1 enters the hole 3a of the guide plate 3, and there is a risk of damaging the edge of the lens 1 when the lens 1 is inserted into the hole 3a of the guide plate 3. As shown in the figure, there was a problem in that the guide plate 3 covered many parts of the disc 2, making it difficult to work.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a receptacle for optical communications that solves the above problems and allows a cylindrical lens to be safely and easily attached to a receptacle body while adjusting the position of the lens.

[Structure of the Invention] In order to achieve the above object, the present invention includes a guide hole for inserting a guide rod used for adjusting the lens position when attaching a lens unit to the outer surface of a disk fixed to the outer circumference of a cylindrical lens. At least two of them are formed symmetrically.

[Explanation of Examples]

Embodiments of the present invention will be specifically described below based on the drawings.

FIG. 5 shows an example of a disc according to the present invention, and this example has guide holes 2b, 2b provided on both sides of a lens loose fitting hole 2a as shown in the figure, and fixation to a cylindrical lens is the same as in the conventional case. be.

FIG. 6 shows an example of a guide tool used when attaching the lens unit shown in FIG. 5, in which the disk 2 is fixed to a cylindrical lens, to the receptacle body. base 4a connected to
Then, the two guide holes 2b, 2b are formed in this base body 4a.
two elastic guide rods 4b with one end fixed and the tip bent into an L shape, spaced apart from each other at the same interval as the
It consists of 4b. The thickness of the guide rod 4b is slightly thinner than the diameter of the guide hole 2b, and the length of the bent end portion 4c is slightly longer than the depth of the guide hole 2b, so that the guide rod 4b can be attached to and removed from the disk 2. becomes easier.

FIG. 7 shows the guide tool 4 engaged with the lens unit in which the disk 2 is fixed to the cylindrical lens 1. As mentioned above, the guide rod 4b is elastic, and the guide hole 2b is Since the discs 2 are located on both sides of the loose fitting hole 2a, the disc 2 can be moved while remaining in contact with the receptacle body. Furthermore, as is clear from this figure, in the case of the present invention, the guide tool 4 does not touch the lens and does not cover the disc.
Therefore, there is no risk of damaging the lens during the work of fixing the lens unit to the receptacle body, and the adhesion work is also easy.

Figure 8 shows the lens unit in the receptacle body 5.
This figure shows an example of the optical communication receptacle of the present invention completed by fixing it to a.

Although the above example shows the case where two guide holes are provided, if three guide holes are provided and three guide rods are provided as shown in Fig. 9, the fixation will be more stable and the installation work will be easier. It is possible to make it even easier to perform.

〔Effect of the invention〕

As described above, the optical communication receptacle of the present invention allows the cylindrical lens to be safely and easily attached to the receptacle body while adjusting the position of the lens. Therefore, according to the present invention, it is possible to provide a high quality and low cost optical communication receptacle.

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view of the optical path in which light emitted from an optical fiber passes through a cylindrical lens and becomes parallel light, Fig. 2 is a perspective view showing a conventional example of a lens unit in an optical communication receptacle, and Fig. 3 is the same as Fig. 2. FIG. 4 is a perspective view of the guide plate used when attaching the lens unit to the receptacle body, FIG. 4 is a perspective view showing the guide plate of FIG. 3 inserted into the lens unit of FIG. 2, and FIG. FIG. 6 is a perspective view showing an example of a guide tool for adjusting the lens position used when attaching the lens unit to the receptacle body according to the present invention; FIG. 7 is a perspective view of the disk shown in FIG. 5. FIG. 8 is a sectional view showing an embodiment of the optical communication receptacle according to the present invention, and FIG. 9 is a perspective view showing a state in which the guide tool shown in FIG. It is a perspective view which shows another Example of a board. 1... Cylindrical lens, 2... Disc, 2a... Lens loose fitting hole, 2b... Guide hole, 4... Guide tool, 4a
... Base body, 4b ... Guide rod, 4c ... Bent end portion, 5 ... Receptacle body.

Claims (1)

[Claims] 1. In an optical communication receptacle constructed by attaching to a receptacle body a lens unit consisting of a cylindrical lens that converts light emitted from an optical fiber into parallel light and a disc fixed to the outer periphery of the cylindrical lens, the disc 1. A receptacle for optical communication, characterized in that at least two guide holes for inserting guide rods used for lens position adjustment when attaching a lens unit are symmetrically formed on the outer surface of the receptacle.