JP2004287198A - Precision sleeve type receptacle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a precision sleeve type receptacle which has an excellent performance, uses a highly reliable precision sleeve, moreover, is easily manufactured, and whose manufacture cost is low. <P>SOLUTION: In the precision sleeve type receptacle 1, where the precision sleeve 3 made of zirconia is inserted and fixedly held by forcibly being fitted into a sleeve holder 2 in which a hollow cylindrical inner space is formed. Therein, the inner space of the sleeve holder 2 is composed of an inner diameter enlargement part 21 whose diameter is formed larger than the outer diameter of the precision sleeve 3 and a sleeve retention part 22 whose diameter is formed in almost the same size as the outer diameter of the precision sleeve 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a precision sleeve type receptacle used for an optical transceiver component such as an optical transceiver module.
[0002]
[Prior art]
In data communication using an optical fiber, an optical transceiver module is used as a bidirectional communication module. The optical transceiver module includes a light emitting element and a light receiving element, and is provided with an optical receptacle in which an optical connector provided at an end of the optical fiber cable is fitted for connection with an optical fiber.
[0003]
For example, as such an optical receptacle, FIG. 4A shows a structure of an optical receptacle 102 for optically coupling output light of an LD (laser diode) 100 of an optical element to an SC connector 101 on the optical fiber side (Patent). Reference 1).
[0004]
An optical receptacle 102 shown in FIG. 4A includes an optical element unit including an LD 100 and a condenser lens 103, and a cylindrical zirconia sleeve 104 that is fitted and held with a ferrule of an optical connector 101 on the other optical fiber side. , A hollow cylindrical sleeve holder 105 for holding the sleeve 104, and a metal cover 106 for covering these. A stub ferrule 107 made of zirconia is fixed inside the sleeve 104.
[0005]
In such an optical receptacle, a component in which a zirconia sleeve is mounted in a sleeve holder is used as a receptacle. The receptacle includes (i) a cylindrical precision sleeve (sometimes called a rigid sleeve), or (ii) an elastic sleeve (sometimes called a split sleeve) having a cylindrical shape. Some of them are used (see Patent Document 2).
[0006]
The optical receptacle shown in FIG. 4A has a receptacle using a precision sleeve. 4 (b) and 4 (c) show the receptacle of FIG. 4 (a). FIG. 4 (b) is a perspective view before press-fitting, and FIG. 4 (c) is a sectional view after press-fitting. is there. As shown in FIG. 4B, the receptacle 110 is configured by holding a cylindrical zirconia sleeve 104 by being pressed into a hollow cylindrical metal holder 105.
[0007]
As shown in FIG. 4C, the outer diameter of the zirconia sleeve 104 and the inner diameter of the cylindrical space of the sleeve holder 105 are substantially the same. The receptacle using the precision sleeve as shown in FIG. 4C is very effective for the wiggle test and the light fluctuation is stable, as compared with the receptacle using the split sleeve. The wiggle test is a test in which a connector is inserted into a receptacle module, and light fluctuation when the connector is moved right and left and up and down (when bent) is observed.
[0008]
[Patent Document 1]
JP-A-2001-66468 (FIG. 5)
[Patent Document 2]
JP-A-10-332988 (paragraph numbers 0002 to 0004)
[0009]
[Problems to be solved by the invention]
When used as an optical receptacle, the stub ferrule 107 and the ferrule of the optical connector 101 are fitted inside the zirconia sleeve 104 as shown in FIG. However, in a receptacle using a precision sleeve, when the zirconia sleeve 104 is press-fitted into the sleeve holder 105, the inner diameter of the sleeve 104 is reduced due to the pressure from the holder, so that it is difficult for the stub ferrule or the ferrule of the connector or the like to enter. Would.
[0010]
For this reason, it is necessary to grind the inside of the zirconia sleeve 104 one by one to return the reduced inner diameter of the hole to a predetermined size in the press-fitted receptacle 110. However, the hole polishing operation has a problem that the number of operation steps is increased, the yield of the product is increased, and the cost of the product is increased.
[0011]
If a split sleeve is used instead of the precision sleeve, there is no need to press-fit the sleeve, so such a problem does not occur. However, as described above, the receptacle using the split sleeve has a problem that the light fluctuation is reduced when the wiggle test is performed as compared with the receptacle using the precision sleeve.
[0012]
In addition, when using an inextricable precision sleeve, it is conceivable that the outer diameter of the sleeve is made slightly smaller than the inner diameter of the sleeve holder, and the inside of the sleeve holder is fixed with an adhesive without being pressed into the sleeve holder. In this case, the inner diameter of the sleeve does not change. However, the adhesive may be softened or hardened due to aging in an environment of about −40 ° C. to about + 85 ° C., which is the usage condition of the receptacle. Then, the center axis of the sleeve is displaced, and normal light propagation is hindered, resulting in a reduction in performance. Further, the adhesive may protrude and adhere to the light path, or gas may be released from the adhesive during use. From such a point, using an adhesive in the receptacle has a problem of low reliability.
[0013]
The present invention has been made to solve the above-mentioned disadvantages of the prior art, and provides a receptacle which is excellent in performance and uses a highly reliable precision sleeve, and which is easy to manufacture and inexpensive to manufacture. The purpose is to:
[0014]
[Means for Solving the Problems]
The present invention
(1) In a precision sleeve type receptacle in which a ferrule of an optical connector is fitted and a precision sleeve for holding the ferrule is inserted and fixedly held in a sleeve holder having a hollow cylindrical internal space. The hollow cylindrical internal space of the holder is composed of an enlarged inner diameter portion formed larger than the outer diameter of the precision sleeve, and a sleeve holding portion formed to be approximately the same size as the outer diameter of the precision sleeve. Precision sleeve type receptacle,
(2) In the precision sleeve, the precision sleeve type receptacle according to (1), wherein the inner diameter of a portion corresponding to the sleeve holding portion of the sleeve holder is formed large.
It is the gist.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing an embodiment of a precision sleeve type receptacle (hereinafter simply referred to as a receptacle) of the present invention. In the receptacle 1 of the present invention, a precision sleeve 3 made of zirconia, which is formed in a tubular shape without being split, is inserted and fixedly held by press-fitting into a sleeve holder 2 provided with a hollow cylindrical internal space. This is a precision sleeve type receptacle.
[0016]
FIG. 2 is a sectional view of the receptacle of FIG. The sleeve holder 2 used in the receptacle 1 of the present invention has a hollow cylindrical internal space as shown in FIGS. 1 and 2, and the diameter of the internal space is larger than the external diameter of the precision sleeve 3. It comprises a formed inner diameter enlarged portion 21 and a sleeve holding portion 22 formed to be almost the same size as the outer shape of the precision sleeve 3.
[0017]
The sleeve holder 2 is made of a metal such as SUS, a plastic molded product, or another material. SUS metal has advantages that it can be welded and has excellent durability and the like. The precision sleeve 3 can be formed from a metal such as zirconia ceramics or SUS. In general, the ferrule at the tip of the optical fiber cable is made of zirconia ceramic, so that the precision sleeve 3 to which the ferrule is fitted is also made of zirconia ceramic, so that compatibility is good, and zirconia ceramic is also excellent in dimensional accuracy.
[0018]
As shown in FIG. 2, the cylindrical internal space for holding the precision sleeve 3 of the sleeve holder 2 is formed as an opening on the press-fit side of the precision sleeve 3, and the other is formed as a wall except for the optical path from the light source. And has the shape of a cylindrical recess formed as a bottom. In the sleeve holder 2, the inner diameter enlarged portion 21 is provided on the opening side with a length of L2, and the sleeve holding portion 22 is provided on the bottom portion 24 with a length of L5 (L3 + L4). Further, the length of the cylindrical concave portion (total length: indicated by L1 in FIG. 2) is formed larger than the length P1 of the precision sleeve 3 (see FIG. 3) by the length L4.
[0019]
FIG. 3 is a sectional view of the precision sleeve 3 of FIG. The precision sleeve 3 shown in FIGS. 1 and 3 is formed in a cylindrical shape with a uniform outer diameter over the longitudinal direction and without a step. When the precision sleeve 3 is press-fitted so as to be flush with the opening 23 side of the sleeve holder 2, the total length P 1 of the precision sleeve 3 is longer than the length L 1 of the cylindrical concave portion of the sleeve holder 2 by L 4. It is formed only short. As a result, after the press-fitting of the precision sleeve 3, a space is formed between the precision sleeve 3 and the bottom surface 24 of the cylindrical concave portion.
[0020]
The inside of the precision sleeve 3 is formed as a cylindrical space in which a ferrule or a stub ferrule of an optical connector is fitted to hold the ferrule or the like. This space may be formed as a cylindrical space having a uniform inner diameter in the longitudinal direction. However, as shown in FIGS. 1 and 3, it is preferable that the space includes a normal inner diameter portion 31 and an enlarged inner diameter portion 32.
[0021]
Normally, the inner diameter of the inner diameter portion 31 has a designed inner diameter corresponding to the outer diameter of a ferrule or a stub ferrule (not particularly shown) of an optical connector fitted into the precision sleeve 3. As ferrules fitted inside the precision sleeve 3, for example, those having a size of 2.5 mm and 1.25 mm are distributed as standard products. The inner diameter of the precision sleeve 3 can be formed to a design value according to the size of such a ferrule. For example, as a design value of the inner diameter corresponding to the ferrule, a numerical value such as 2.5 mm (inner diameter) +1 μ to −0 μ (tolerance) or 1.25 mm + 1 μ to −0 μ is cited.
[0022]
The normal inner diameter portion 31 of the precision sleeve 3 is provided on the side of the opening 23 of the sleeve holder 2 and is formed to have a length P2 from the end of the opening 23. As shown in FIG. 1, the length P2 of the normal inner diameter portion 31 of the sleeve 3 is formed to be slightly shorter than the length L1 of the inner diameter enlarged portion 21 of the sleeve holder 2. The length P2 of the normal inner diameter portion 31 may be formed to be the same as the length L1 of the inner diameter enlarged portion 21 of the sleeve holder 2. A portion of the normal inner diameter portion 31 corresponding to the inner diameter enlarged portion 21 of the sleeve holder 2 is a portion where the outside of the precision sleeve 3 does not contact the sleeve holder 2. That is, since the inner diameter portion 31 does not normally come into contact with the sleeve holder 2, the internal hole does not become small.
[0023]
The enlarged inner diameter portion 32 is formed at a portion corresponding to the sleeve holding portion 22 of the precision sleeve 3. The portion corresponding to the portion of the sleeve holding portion 22 is a portion where at least the sleeve holding portion 22 and the precision sleeve 3 are in contact with each other. The inner diameter of the enlarged inner diameter portion 32 may be made larger than the design value of the normal inner diameter portion 31 by an amount corresponding to the pressure applied by the contact with the sleeve holding portion after the press-fitting into the sleeve holder 2 and contraction due to the reduced inner diameter. . The amount of shrinkage differs depending on the material of the sleeve holder and the like. For example, when press-fitting a precision sleeve made of zirconia ceramics into a metal sleeve holder, if the inner diameter is formed to be 2.50 mm or 1.25 mm, the inner diameter of the precision sleeve corresponding to the sleeve holding portion after press-fitting is It becomes smaller by several μm.
[0024]
The enlarged inner diameter portion 32 of the precision sleeve 3 is formed so as to correspond to the sleeve holding portion 22 of the sleeve holder 2 so as to be on the bottom surface portion 24 side of the sleeve holder 2, and the length P3 of the enlarged inner diameter portion 32 is at least precision. It is preferable that the portion where the outside contacts the sleeve holding portion 22 after the sleeve press-fitting is covered. In the precision sleeve 3 of the embodiment shown in FIGS. 1 and 3, the length P of the enlarged inner diameter portion 32 is formed slightly longer than the portion in contact with the sleeve holding portion 22. In this way, by forming the length of the enlarged inner diameter portion 32 so as to cover at least the contact portion with the sleeve holding portion 22, shrinkage of the inner diameter can be reliably covered.
[0025]
In the sleeve holder 2, the length (L <b> 5) of the sleeve holding portion 22 needs to be at least a length that can reliably hold the precision sleeve 3. It is preferable that the specific length (L5) of the sleeve holding portion 22 is not less than 10% and not more than 50% of the length (P1) of the precision sleeve 3. If it is less than 10%, sufficient holding may not be possible, and if it is more than 50%, a portion to be contracted by press-fitting becomes large, and the coupling accuracy is reduced. Further, the length (L5) of the sleeve holding portion 22 is preferably formed to be 0.80 to 1.50 mm or more.
[0026]
Generally, the precision sleeve 3 has a length (P1) of about 4.00 to 5.00 mm. In this case, the length (L5) of the sleeve holding portion 22 is optimally formed to be about 0.80 to 1.50 mm.
[0027]
INDUSTRIAL APPLICABILITY The receptacle of the present invention can be optimally used as a receptacle part of an optical transceiver used for a data communication line for bidirectional communication (especially including images).
[0028]
【Example】
1 shows an embodiment of the receptacle of the present invention. The present invention is not limited to the following examples.
A precision sleeve made of zirconia ceramics has an outer diameter of 1.70 mm, an overall length (P1) shown in FIG. 3 of 4.00 mm, an inner diameter of the normal inner diameter portion 31 of 1.25 mm, and a length (P2) of 3.00 mm. The inner diameter of the enlarged inner diameter portion 32 was formed to 1.35 mm, and the length (P3) thereof was formed to 1.00 mm. In the SUS sleeve holder, the inner diameter of the inner diameter enlarged portion 21 shown in FIG. 2 is 1.80 mm, its length (L2) is 3.20 mm, the inner diameter of the sleeve holding portion 22 is 1.70 mm, and its length (L5). Was formed to 1.00 mm. The precision sleeve made of zirconia was pressed into the sleeve holder made of SUS to obtain a receptacle.
[0029]
【The invention's effect】
Since the present invention is a receptacle using a precision sleeve, it has excellent characteristics against light fluctuations and the like as compared with a receptacle using a split sleeve, and also has high reliability because it does not use an adhesive or the like. A precision sleeve type receptacle is obtained.
[0030]
Further, according to the present invention, the hollow cylindrical internal space of the sleeve holder is formed by an enlarged inner diameter portion formed to be larger than the outer diameter of the precision sleeve and a sleeve holding portion formed to have substantially the same size as the outer shape of the precision sleeve. With this configuration, when press-fitting the precision sleeve into the sleeve holder, the precision sleeve can be inserted smoothly in the enlarged inner diameter part, and the precision sleeve is securely held in the sleeve holding part, making it easy to manufacture. It is.
[0031]
In addition, since the precision sleeve is not pressed by the sleeve holder at the enlarged inner diameter portion, it is possible to prevent the precision sleeve from shrinking at a portion corresponding to the enlarged inner diameter portion. A receptacle having a low manufacturing cost can be obtained.
[0032]
Further, in the precision sleeve type receptacle of the present invention, when the precision sleeve is formed to have a large inner diameter at a portion corresponding to the sleeve holding portion of the sleeve holder, even if the precision sleeve at the portion contacting the sleeve holding portion after press-fitting shrinks, the precision sleeve becomes Since the portion of the sleeve corresponding to the sleeve holding portion is formed as an enlarged inner diameter portion, it is possible to maintain a state close to the design value, and furthermore, it is possible to obtain an effect that manufacturing is easy.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an embodiment of the receptacle of the present invention.
FIG. 2 is a sectional view of the sleeve holder of FIG. 1;
FIG. 3 is a sectional view of the precision sleeve of FIG. 1;
4A is a sectional view showing an example of a conventional optical receptacle, FIG. 4B is an exploded perspective view of the receptacle shown in FIG. 4A, and FIG. 4C is a sectional view of the receptacle shown in FIG. It is.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Receptacle 2 Sleeve holder 3 Precision sleeve 21 Inner diameter enlarged part of sleeve holder 22 Sleeve holder of sleeve holder 31 Normal inner diameter part of precision sleeve 32 Expanded inner diameter part of precision sleeve

Claims (2)

In a precision sleeve type receptacle in which a ferrule of an optical connector is fitted and fixedly held by inserting a precision sleeve for holding the ferrule into a sleeve holder having a hollow cylindrical internal space, the hollow of the sleeve holder The precision, characterized in that the cylindrical internal space is composed of an enlarged inner diameter portion formed larger than the outer diameter of the precision sleeve and a sleeve holding portion formed approximately the same size as the outer diameter of the precision sleeve. Sleeve type receptacle. 2. The precision sleeve type receptacle according to claim 1, wherein the inner diameter of a portion of the precision sleeve corresponding to the sleeve holding portion of the sleeve holder is formed large.

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