JPH07239428A - Parts for optical communication - Google Patents

Abstract

PURPOSE:To prevent the generation of crack in the weld zones between parts constituting parts for optical communication by previously forming micro- spacings between plural pieces of the metallic parts fitted by press fitting and welding these clearance parts. CONSTITUTION:After a sleeve 3 is press fitted to a receptacle body 1, a stopper 2 is press fitted to the front end side of the through-hole of this receptacle body 1 until both front end faces 5, 7 of the receptacle body 1 and the stopper 2 are aligned. As a result, the slight spacing 11 is formed over the prescribed length and preferably width in the axial direction between the receptacle body 1 and the stopper 2 in the weld zone 12. The slight spacing 11 is formed between the inner peripheral surface of the through-hole of the receptable body 1 and the stopper 2 in the weld zone 12 at the time of YAG welding and, therefore, the compressive stress to be generated between the receptacle body 1 and the stopper is decreased or eliminated. As a result, the generation of the crack in the weld zone 12 is substantially obviated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical communication component used for optical communication, optical measurement and the like, and more particularly to an optical component for preventing cracks from being generated at a welded part of the optical communication component. The present invention relates to communication parts.

[0002]

2. Description of the Related Art Optical communication components composed of a plurality of metal components are often used in places where they cannot be easily replaced, such as inside structures or the sea floor, and therefore their characteristics have long been maintained. In addition, for example, in optical communication using a single mode fiber, micron-order accuracy is required for positioning the components forming the optical component.

In order to perform such highly durable and highly accurate positioning, some optical communication components are manufactured by a procedure in which a plurality of components are fitted by press fitting and then YAG welding is performed. For example, a receptacle will be described more specifically. As shown in FIG. 3, a stainless steel stopper body 101 is provided on a stainless steel stopper body 101 as shown in FIG.
102 and ceramic sleeve 103 are press-fitted, and receptacle body 101 and stopper 102 are welded together at Y
It is fixed by AG welding.

Receptacle body 101 and stopper 102
As for the material of SUS304, among stainless steels, JIS standardized SUS304 or its equivalent is used. The reason is that SUS304 is easy to perform precision machining unlike difficult-to-cut materials such as SUS303 and Kovar.
This is because even when YAG welding, which is often used for connection with the light emitting / receiving element, is performed, cracks are unlikely to occur in the welded portion.

The reason why the receptacle body 101 and the stopper 102 are formed separately is that the stopper 102 is formed.
This is because it is necessary to polish the inner end surface 108 so that the center average roughness becomes 0.2a in order to align the end surface position of the ferrule 115 with the base end surface 108 of FIG. The receptacle body 101 is a through hole for press-fitting the stopper 102 and the sleeve 103.
104 is opened and has a front end surface 105 and a base end surface 106 which are perpendicular to the through hole 104.

The stopper 102 is formed in a cylindrical shape slightly larger (for example, about 10 μm) than the through-hole 104, and the through-hole formed at the center of the stopper 102 makes the light incident on the optical fiber 116 inserted into the sleeve 103 ( Alternatively, optical fiber 11
The light emitted from 6) penetrates through. Further, the inner diameter of the front end surface 107 of the stopper 102 is chamfered (C-face processing) so that the light emitted from the optical fiber is less likely to be blocked.

The sleeve 103 is made of, for example, zirconia so that it has less friction even when the ferrule 115 is inserted and is less likely to be scratched. Its outer diameter is slightly larger than the inner diameter of the receptacle body 101, The inner diameter is cylindrically shaped so that it is slightly smaller than the outer diameter of the matching ferrule 115. Further, the inner diameter portion of the base end surface 110 of the sleeve 103 is chamfered (C-faced) to facilitate the insertion of the ferrule 115.

The sleeve 103 has a base end surface 106 that is inserted into the through hole 104 of the receptacle body 101 with the front end surface 109 first.
Is pressed in from. The position of this sleeve 103 after press fitting is
When pressing the stopper 102, press the sleeve 103 and stopper
The position is set so that 102 does not touch and the distance is 1 mm or less. After press-fitting the sleeve 103 into the receptacle body 101, the inner diameter of the sleeve 103 is ground until the ferrule 115 can be inserted.
Further, after this, the stopper 102 is arranged so that the base end surface 108 comes first, and from the distal end surface 105 side of the receptacle main body 101, the distal end surface 105 of the receptacle main body 101 and the distal end surface 108 of the stopper 102.
Press in until and match.

Further, after this, the stopper 102 is attached to the base surface 108.
As shown in FIG. 4, the end face 107 of the stopper 102 and the end face 105 of the receptacle body 101 are connected to each other at both end faces 105 so that the position variation of the stopper is within 1 μm when a load of 30 kgf is applied from the side. Irradiate a YAG laser from a direction perpendicular to 107 to form an end face of the receptacle body 101.
105 and the end surface 107 of the stopper are welded.

The lens assembly 112 is fixed to the receptacle by YAG welding, and
The light beam emitted from 114 is the lens assembly 112.
Sleeve through ferrule 115 through lens 113
The light is incident on the optical fiber 116 supported by 103.

[0011]

By the way, the receptacle body 101 and the stopper 102, which are press-fitted as in the conventional case, are separated from each other.
In the case of fixing by AG welding, for example, as reported in the 1991 IEICE Spring National Convention, C-267, compressive stress is generated in the receptacle body 101 and the stopper 102, which are YAG welded parts, and the welded parts 111 are welded. It has been pointed out that cracks easily occur.

The crack in the welded portion 111 is caused by the stopper 10
Since it is easy to pull out 2 from the base end side to the front end side and the so-called pulling force is reduced, and the reliability of the product is impaired, it is desirable to prevent the occurrence thereof as much as possible. The present invention has been made in view of the above circumstances, and an object thereof is to provide an optical communication component capable of preventing the occurrence of cracks in a welded portion between components constituting the optical communication component.

[0013]

In order to achieve the above-mentioned object, the present invention is for optical communication in which a minute gap is formed in advance between a plurality of metal parts fitted by press fitting and the gap is welded. It was a part. This small gap may be formed in either one of the parts to be welded together, and
It may be formed on both parts that are welded together.

[0014]

In the present invention, since a slight gap is formed in advance between a plurality of metal parts fitted by press fitting, the compressive stress which causes cracks is not generated by welding, and cracks are generated in the welded part. It is hard to occur.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An optical communication component according to an embodiment of the present invention will be specifically described below with reference to the drawings. In this embodiment, the present invention is applied to a receptacle, and its schematic structure is the same as the conventional one, as shown in FIG.

That is, this receptacle is made up of a stainless steel (SUS304) receptacle body 1 and a stainless steel (SUS30) press-fitted into a through hole 4 formed therein.
4) A stopper 2 made of ceramics and a sleeve 3 made of ceramics (for example, zirconia) are provided. The structures of the receptacle body 1 and the sleeve 3 are the same as those of the conventional example, and therefore detailed description thereof is omitted here to avoid duplication.

As shown in the enlarged cross-sectional view of FIG. 1, the stopper 2 is pressed into the receptacle body 1 so that the stopper 2 can be positioned at an arbitrary position, so that the stopper 2 is larger than the inner diameter of the through hole 4 of the receptacle body 1. It is formed about 10 μm larger than the inner diameter of the through hole 4 of the reticle body 1 over the entire circumference by cutting, for example, near the tip surface 7 corresponding to the welded portion. ing.

After the sleeve 3 is press-fitted into the receptacle body 1, the stopper 2 is attached to the tip side of the through hole 4 of the receptacle 1 on both tip surfaces 5 of the receptacle body 1 and the stopper 2.
When press-fitted until 7 coincides with each other, in the welded portion 12, a slight gap 11 is formed between the receptacle body 1 and the stopper 2 in the axial direction thereof over a predetermined length and a predetermined width.

Thereafter, the YAG laser is irradiated onto the predetermined welded portion 12 from a direction perpendicular to both tip surfaces 5 and 7 of the receptacle body 1 and the stopper 2 to complete the receptacle. In the figure, 6 is the base end surface of the receptacle body 1, 8 is the base end surface of the stopper 2, 9 is the tip end surface of the sleeve 3, and 10 is the base end surface of the sleeve 3.

In this embodiment, the pulse width is short,
The welding conditions are selected such that the YAG laser pulse width is 3.5 ms, the voltage applied to the YAG rod is 320 V, and the spot diameter is 0.5 mm so that welding can be performed by increasing the applied voltage and causing relatively no problems in appearance. At the time of this YAG welding, at the welded portion 12, the inner peripheral surface of the through hole 4 of the receptacle body 1,
Since the slight gap 11 is formed between the stopper 2 and the stopper 2, the compressive stress generated between the receptacle body 1 and the stopper 2 is reduced or eliminated, and the welded portion 12 is less likely to crack.

The radial width of the gap 11 is set to 10 μm because the welding spot diameter is 0.5 mm in this embodiment, but it is not particularly limited and may be appropriately selected depending on the welding conditions. For example, under the above-mentioned welding conditions, it is preferably 100 μm or less, and if it is larger than this, there is a possibility that the two cannot be joined with sufficient welding strength, which is not preferable.

The length of the gap 11 in the axial direction is not particularly limited, but it is 1 mm in consideration of the welding depth (here, 0.8 mm), preferably the range in which the heat influence during welding appears remarkably. That is all. Comparing the crack occurrence rate between the receptacle thus obtained and the conventional example,
In the conventional example, the crack occurrence rate was about 90%, whereas in the receptacle according to this embodiment, the crack occurrence rate was about 10%, and by providing the gap 11 in the welded portion 12, the crack occurrence rate was significantly increased. Decreased to.

In a receptacle according to another embodiment of the present invention, although not shown, when the stopper 2 is press-fitted into the receptacle body 1, solder, low melting point glass or the like is filled, and then YAG welding is performed. As a result, the sealing property between the receptacle body 1 and the stopper 2 is enhanced. Other configurations, operations and effects of this embodiment are the same as those of the above-mentioned one embodiment, and therefore their explanation is omitted to avoid duplication.

In another embodiment of the present invention, although not shown, continuous seam welding of the receptacle body 1 and the stopper 2 enhances the sealing performance between the receptacle body 1 and the stopper 2. To be Other configurations, operations and effects of this embodiment are the same as those of the above-mentioned one embodiment, and therefore their explanation is omitted to avoid duplication.

In each of the above-described embodiments, the inner diameter of the through hole 4 is made uniform, and the outer diameter of the stopper 2 is made different to form the gap 11. Even if the stopper 2 having a slightly different diameter is formed and the outer diameter is uniform, the stopper 2 is press-fitted into the through hole 4 to form a gap between the inner peripheral surface of the through hole 4 and the stopper 2. Well, the through hole 4 is formed as a different diameter hole having a slightly enlarged tip side portion, and a cylindrical stopper 2 having a slightly reduced outer diameter of the tip portion is press-fitted into the through hole 4. Thus, a gap may be formed between the inner peripheral surface of the through hole 4 and the stopper 2.

The component for optical communication to which the present invention is applied is not limited to the above-mentioned receptacle, and the components are positioned by press fitting such as an optical isolator which is fixed by YAG welding after positioning the angle of the polarizing element. After that, it can be applied to all optical communication components fixed by YAG welding.

[0027]

As described above, according to the present invention, since minute gaps are formed in advance in the welded portions between metal parts to be welded to each other, the compressive stress of the parts during YAG welding is reduced or eliminated. Therefore, it is possible to YAG-weld and fix a part and another part that is press-fitted and positioned to this part, increasing the removal force of the press-fitted part, and The reliability can be increased.

Further, continuous seam welding can be performed as a welding method, and soldering or low-melting glass can be filled in a gap formed in a welded portion after press-fitting a component, before welding, or after welding to enhance airtightness. become.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of a main part of an embodiment of the present invention.

FIG. 2 is a sectional view showing a schematic configuration of an embodiment of the present invention.

FIG. 3 is a cross-sectional view showing a schematic configuration of a conventional example.

FIG. 4 is a sectional view of a main part of a conventional example.

[Explanation of symbols]

 1 ... Receptacle body 2 ... Stopper 11 ... Gap 12 ... Welding point

Claims (1)

[Claims] 1. A component for optical communication, wherein a minute gap is previously formed between a plurality of metal components fitted by press fitting, and the gap is welded.