JP5051628B1 - Optical receptacle - Google Patents

Abstract

An aspect of the present invention is to provide an optical receptacle capable of suppressing a beam from projecting to the outside at the time of press-fitting and a waste from being ejected to the outside.
An optical receptacle comprising a bush for holding a stub and a housing having a hole into which the bush is press-fitted, wherein at least one of an outer peripheral surface of the bush and an inner peripheral surface of the hole. There is provided an optical receptacle characterized in that press-fitting portions and concave portions are alternately provided in the axial direction.
[Selection] Figure 1

Description

  Aspects of the present invention generally relate to optical receptacles.

In the field of optical communications, an optical receptacle is used to optically connect an optical fiber connector to an optical element such as a light receiving element or a light emitting element.
The optical receptacle is provided with a fiber stub in which an optical fiber is fixed in a through hole that penetrates the center of a ferrule made of zirconia or the like in the axial direction. A bush is provided at the rear end of the fiber stub, and the tip of the fiber stub is inserted into the housing of the optical receptacle, and the bush is press-fitted and fixed in the hole of the housing.

Here, when the bush is press-fitted into the hole of the housing, the outer peripheral surface of the bush or the inner peripheral surface of the hole of the housing may be scraped off to generate scraps or burrs.
When such debris or burrs are generated, it becomes difficult to join the photoelectric conversion element package provided with the light receiving element or the light emitting element, or the debris or the like enters the photoelectric conversion element package and the optical receptacle. There might be a failure in the function.

For this reason, a bushing (protruding cylinder portion 92 in Patent Document 1) in which a large number of gear protrusions are radially provided in the press-fitted portion has been proposed (see Patent Document 1).
In the technique disclosed in Patent Document 1, when the bush is press-fitted, the shape of the gear protrusion is cut off to become waste, which is removed by being blown away by air blow or the like (see FIG. 1 of FIG. 1). 5 and [0023] paragraph, [0024] paragraph, etc.).
For this reason, if the scrap is not completely removed, the bite of the scrap may occur, resulting in a defective product. Further, if the inspection for removing the waste is performed, the process becomes complicated and the production cost may increase.

Further, a flash pool is provided at the end of the inner peripheral surface of the bush (holder 7 in Patent Document 2) for press-fitting and fixing the rear end of the fiber stub, and the beam protrudes when the fiber stub is press-fitted into the hole of the bush. A technique for suppressing this has been proposed (see Patent Document 2).
In the technique disclosed in this Patent Document 2, it is possible to prevent a flash from protruding during press-fitting on the end surface near the inner diameter portion on the photoelectric conversion element package (case 11 in Patent Document 2) side.
However, it is difficult to prevent the burr from protruding or the burr from being cut and released as waste, and as in the case of Patent Document 1, defective products are generated due to biting of burr and chips. Or inspecting burrs and chips may increase production costs.

JP 2009-265507 A JP 2003-241025 A

  An aspect of the present invention has been made on the basis of recognition of such a problem, and an optical receptacle capable of suppressing a beam from projecting to the outside during press-fitting or a waste from being ejected to the outside is provided. It is to provide.

1st invention is the optical receptacle provided with the bush which hold | maintains the stub, and the hole part into which the said bush is press-fit, Comprising: The material of the said bush and the said housing is a metal, At least one of the outer peripheral surface of the bush and the inner peripheral surface of the hole is provided with a press-fit portion and a recess alternately in the axial direction, and at least the outer peripheral surface of the bush and the inner peripheral surface of the hole In any of the above, at least two of the press-fit portions and the groove-shaped recess provided between the two press-fit portions are provided, and the press-fit portion before the press-fit has a planar shape. The optical receptacle has a size in the axial direction of the press-fitted portion before the press-fitting is 0.02 mm or more and 0.13 mm or less .
According to this optical receptacle, since scraps scraped off during press-fitting are stored and held inside the recesses, it is possible to prevent the flashes from projecting to the outside and the scraps from being discharged to the outside. be able to.
Further, by providing the concave portion, it is possible to optimize the press-fitting load and the press-fitting position dimension which is the dimension L from the rear end portion of the bush to the rear end portion of the housing.
For example, the press-fit load can be reduced, and variations in the press-fit load can be reduced. In addition, the press-fit position dimension can be set near a predetermined value, and variations in the press-fit position dimension can be reduced. That is, it is possible to improve the accuracy of the press-fitting position.

According to this optical receptacle, the outer peripheral portion of the bush, and was the debris scraped the inner peripheral portion of the hole portion of the housing is securely accommodated in the recess, because it is held, never dusting occurs .
Further, since the outer peripheral portion of the bush and the inner peripheral portion of the hole portion of the housing are scraped on the front end side in the press-fitting direction of the bush, the amount of scraping decreases toward the rear end side. Therefore, the flash does not protrude from the rear end side in the press-fitting direction of the bush, and debris is not discharged.

According to this optical receptacle, it is possible to optimize the fit load more reliably.
Therefore, it is possible to suppress the occurrence of a galling phenomenon during press-fitting, or the retention strength being weak and being easily removed.

The second invention according to the first invention, the axial dimension of the press-fitting portion before the press-fitting is the above 0.03 mm, the optical receptacle of equal to or less than 0.11mm It is.
According to this optical receptacle, the press-fit load can be optimized more reliably.
For this reason, it is possible to further suppress the occurrence of a caulking phenomenon during press-fitting and the ease with which the holding strength is weak and can be easily removed.

According to a third aspect of the present invention, in the first or second aspect of the invention, the pitch dimension of the press-fitted portion before the press-fitting is 0.05 mm or more.
According to this optical receptacle, it is possible to suppress the burr generated by scraping the outer peripheral portion of the bush and the inner peripheral portion of the hole portion of the housing from exceeding the concave portion and interfering with the adjacent press-fit portion. Therefore, smooth press-fitting can be performed. Moreover, since waste can be stored and held more reliably, contamination due to dust generation and the like can be suppressed.

According to a fourth aspect of the present invention, in any one of the first to third aspects, a dimension in a direction perpendicular to the axial direction of the recess before the press-fitting is 4 μm or more. Is an optical receptacle.
According to this optical receptacle, it is possible to suppress the burr generated by scraping the outer peripheral portion of the bush and the inner peripheral portion of the hole portion of the housing from exceeding the concave portion and interfering with the adjacent press-fit portion. Therefore, smooth press-fitting can be performed. Moreover, since waste can be stored and held more reliably, contamination due to dust generation and the like can be suppressed.
The fifth invention is the optical receptacle according to any one of the first to fourth inventions, wherein the bush and the housing are made of stainless steel.

According to a sixth aspect of the present invention , there is provided an optical receptacle comprising a bush for holding a stub and a housing having a hole into which the bush is press-fitted, wherein the bush and the housing are made of metal. Further, at least one of the outer peripheral surface of the bush and the inner peripheral surface of the hole is provided with press-fitting portions and recesses alternately in the axial direction, and the outer peripheral surface of the bush and the inner peripheral surface of the hole At least one of the bottomed hole-shaped recesses is provided apart from each other, and the recesses are provided so that at least one of the outer peripheral surface of the bush and the inner peripheral surface of the hole portion is provided. The optical receptacle is characterized in that the maximum height roughness before the press-fitting is set to Rmax 4 μm or more .
According to this optical receptacle, the same effect as that of the first invention described above can be enjoyed.
That is, the outer peripheral portion of the bush and the inner peripheral portion of the hole portion of the housing are scraped and reliably stored and held in the recess, so that dust generation does not occur.
Further, since the outer peripheral portion of the bush and the inner peripheral portion of the hole portion of the housing are scraped on the front end side in the press-fitting direction of the bush, the amount of scraping decreases toward the rear end side. Therefore, the flash does not protrude from the rear end side in the press-fitting direction of the bush, and debris is not discharged.
Furthermore, as will be described later with reference to FIG. 9, the press-fit load can be optimized more appropriately. That is, the press-fit load can be further reduced, and variations in the press-fit load can be further reduced.

According to this optical receptacle, it is possible to optimize the fit load more reliably.
Therefore, it is possible to suppress the occurrence of a galling phenomenon during press-fitting, or the retention strength being weak and being easily removed.

The seventh invention is the optical receptacle according to the sixth invention, wherein the recess is formed by using a barrel polishing method.
According to barrel polishing method, it facilitates the hole-shaped recess having a bottom spaced from each other, and it is possible to reliably form the optical receptacle in the sixth invention easy, and can be reliably obtained.

The eighth invention is the optical receptacle according to the sixth or seventh invention, wherein the material of the bush and the housing is stainless steel.
The ninth invention is an optical receptacle according to any one of the first to eighth inventions, wherein the concave portion stores waste generated during press-fitting.
According to this optical receptacle, since the debris generated during press-fitting is stored and held inside the recess, it is possible to prevent the flash from projecting to the outside or the debris from being discharged to the outside. Can do.

  ADVANTAGE OF THE INVENTION According to the aspect of this invention, the optical receptacle which can suppress that a beam protrudes toward the exterior at the time of press injection, or refuse is discharged | emitted toward the exterior can be provided.

It is a schematic cross section for illustrating the optical receptacle which concerns on embodiment of this invention. It is a schematic cross section for illustrating the recessed part provided in the outer peripheral surface of a bush. It is a photograph for illustrating about the crevice provided in the outer peripheral surface of a stainless steel bush. It is a schematic diagram for illustrating the effect at the time of providing a crevice. It is a photograph for illustrating the surface state of the outer peripheral surface of a stainless steel bush. It is a photograph for illustrating the surface state of the outer peripheral surface of the bush before and after press-fitting. It is a schematic cross section for illustrating the press-fitting of the bush and the press-fitting position of the bush. It is a graph for demonstrating the relationship between a press-fit load and a press-fit position dimension. It is a graph for demonstrating the relationship between a press-fit load and a press-fit position dimension. It is a graph for demonstrating the relationship between the dimension W of the axial direction of a press fit part, and a press fit load. It is a graph for demonstrating the relationship between the maximum height roughness of the outer peripheral surface of the bush 13 provided with the several bottomed hole-shaped recessed part 13c, and a press-fit load. It is a graph for demonstrating the relationship between a fastening allowance and a press-fit load.

Hereinafter, embodiments of the present invention will be illustrated with reference to the drawings. In addition, in each drawing, the same code | symbol is attached | subjected to the same component and detailed description is abbreviate | omitted suitably.
FIG. 1 is a schematic cross-sectional view for illustrating an optical receptacle according to an embodiment of the invention.
As shown in FIG. 1, the optical receptacle 1 is provided with a housing 2, a bush 3, a sleeve 4, and a stub 5.
A photoelectric conversion element package 100 provided with a light receiving element, a light emitting element and the like is joined to an end of the optical receptacle 1 on the side where the stub 5 is provided. The ferrule 110 provided with the optical fiber 110a can be inserted into the sleeve 4 from the end of the optical receptacle 1 opposite to the side where the stub 5 is provided.

The housing 2 has a cylindrical shape, and a disc-shaped base portion 2a is provided on the base end side thereof. In addition, a space 2 b having a circular cross section is provided inside the housing 2. The space 2b is opened at both end faces of the housing 2, and a jaw 2c is provided at the opening opposite to the base end so as to protrude into the opening.
Further, a hole 2e into which the bush is press-fitted is provided on the base end side.

Here, when the bush 3 is press-fitted into the hole 2e on the base end side, the outer peripheral portion of the bush 3 or the inner peripheral portion of the hole 2e of the housing 2 may be scraped off, and there is a possibility that debris or burrs may be generated. Therefore, at least one of the outer peripheral surface 3b of the bush 3 and the inner peripheral surface 2d of the hole 2e of the housing 2 is provided with a recess for storing and holding scraps scraped off during press-fitting.
Details regarding the recess will be described later.

The bush 3 is provided with a hole 3a passing through the center in the axial direction, and the stub 5 is held in the hole 3a. The stub 5 may be press-fitted into the hole 3a, or may be held by an adhesive or a mechanical holding means.
The material of the housing 2 and the bush 3 can be, for example, a metal such as stainless steel, copper, iron, or nickel.

A sleeve 4 is provided in a portion defined by the bush 3 and the jaw 2c in the space 2b.
The sleeve 4 is provided with a hole 4a passing through the center in the axial direction. The sleeve 4 may have a cylindrical shape, or may be a so-called split sleeve. When the sleeve 4 is a split sleeve, a slit is provided along the axial direction of the sleeve 4 so that it can be elastically expanded and contracted in the radial direction.
The stub 5 includes a ferrule 5a made of an oxide ceramic such as zirconia or alumina, and an optical fiber 5b inserted and fixed in a through hole of the ferrule 5a.
In addition, although the stub 5 which has the optical fiber 5b is illustrated, it can also be set as the stub which consists of transparent bodies, such as glass or resin, and does not have the optical fiber 5b.

Next, a concave portion that is provided on at least one of the outer peripheral surface 3b of the bush 3 and the inner peripheral surface 2d of the hole 2e of the housing 2 and stores and holds scraps scraped off during press fitting will be illustrated.
Of the outer peripheral surface 3b of the bush 3 and the inner peripheral surface 2d of the hole 2e of the housing 2, the portion involved in press-fitting is referred to as a press-fit portion.
Here, as an example, the concave portion provided on the outer peripheral surface of the bush is illustrated, but the same applies to the concave portion provided on the inner peripheral surface of the hole of the housing. That is, a recess can be provided on at least one of the outer peripheral surface of the bush and the inner peripheral surface of the hole of the housing.

FIG. 2 is a schematic cross-sectional view for illustrating the concave portion provided on the outer peripheral surface of the bush. 2A is a schematic cross-sectional view illustrating a bush having a groove-like recess provided on the outer peripheral surface, and FIG. 2B illustrating a bush having a bottomed hole-like recess provided on the outer peripheral surface. It is.
FIG. 3 is a photograph for illustrating the concave portion provided on the outer peripheral surface of the stainless steel bush. 3 (a) is a bush having no recess on the outer peripheral surface, FIG. 3 (b) is an enlarged photograph of the outer peripheral surface of the bush having no recess, and FIG. 3 (c) is a groove on the outer peripheral surface. FIG. 3D is a photograph for illustrating a bush provided with a bottomed hole-shaped recess on the outer peripheral surface.

The bush shown in FIGS. 3A and 3B is a case where the outer peripheral surface is processed smoothly so that the maximum height roughness is about Rmax 1.5 μm. That is, a general bushing in which a concave portion is not provided on the outer peripheral surface used for the optical receptacle is illustrated.
As shown in FIGS. 2A and 3C, the bush 3 has a groove-like recess 3c provided in the circumferential direction of the outer peripheral surface 3b.
That is, on the outer peripheral surface 3b of the bush 3, press-fitting portions and concave portions 3c are alternately provided in the axial direction.
In addition, the outer peripheral surface 3b of the bush 3 is provided with at least two press-fit portions and a groove-shaped recess 3c provided between the two press-fit portions.

The recess 3c can be a groove formed in a closed loop shape, or can be a groove formed in a spiral shape.
Such a groove-shaped recess 3c can be formed by, for example, a cutting method.
Further, when the recess 3c is a groove formed in a closed loop shape, at least one recess 3c that does not open at the end of the bush 3 can be formed.

  If such a concave portion 3c is formed, an appropriate fitting dimension is automatically formed by scraping the outer peripheral portion adjacent to the concave portion 3c at the time of press-fitting, thus realizing an ideal press-fitted state. can do.

In this case, if the dimension W in the axial direction of the press-fit portion is too large, the outer peripheral portion becomes difficult to be scraped, and a galling phenomenon occurs. On the contrary, if the axial dimension W of the press-fit portion is too small, the outer peripheral portion is excessively shaved and the fitting size becomes small, so that the holding strength is weak and it may be easy to come off.
Therefore, the axial dimension W of the press-fit portion is preferably 0.02 mm or more and 0.13 mm or less.
The axial dimension W of the press-fit portion is more preferably 0.03 mm or more and 0.11 mm or less.

Further, if the pitch dimension P of the press-fitting part, which is the pitch dimension between the parts not provided with the concave part 3c, is not sufficient, the burr generated by scraping the outer peripheral part interferes with the adjacent press-fitted part beyond the concave part 3c, Smooth press-fit may be hindered. In addition, if the pitch dimension P of the press-fitting portion is sufficiently secured, the waste 14 can be stored and held more reliably, so that contamination due to dust generation or the like can be suppressed.
Therefore, the pitch dimension P of the press-fitting part is preferably 0.05 mm or more.
Moreover, it is preferable that the height dimension H (dimension in the direction orthogonal to the axial direction) of the recess 3c is 4 μm or more.

As shown in FIGS. 2B and 3D, the bush 13 is provided with a plurality of bottomed hole-shaped concave portions 13c spaced apart from each other on the outer peripheral surface 13b. That is, on the outer peripheral surface 13b of the bush 13, press-fitting portions and concave portions 13c are alternately provided in the axial direction.
In this case, the recesses 13c can be provided regularly as shown in FIG. 2 (b), or can be provided irregularly as shown in FIG. 3 (d).
The regular recess 13c can be formed by, for example, an etching method. The irregular recess 13c can be formed by, for example, barrel polishing. The hole 13a passing through the center in the axial direction can be the same as the hole 3a of the bush 3 described above, and the material can be the same as that of the bush 3 described above. That is, the bush 3 and the bush 13 differ only in the shape of the recess.

Here, if the concave portion 13c provided on the outer peripheral surface is too small, the outer peripheral portion is difficult to be scraped, and a galling phenomenon occurs. On the contrary, if the concave portion 13c provided on the outer peripheral surface is too large, the outer peripheral portion is excessively shaved and the fitting size becomes small, and the holding strength is weak, and there is a possibility that it is easy to come off.
Therefore, it is preferable that the maximum height roughness of the outer peripheral surface of the bush 13 be Rmax 4 μm or more by providing the recess 13 c.
However, the regular recess 13c does not necessarily have to be clearly formed, and the maximum height roughness of the outer peripheral surface of the bush 13 may be Rmax 4 μm or more.

FIG. 4 is a schematic diagram for illustrating the effect when the concave portion is provided.
Here, as an example, the effect when the recess 3c is provided on the outer peripheral surface of the bush 3 is illustrated.
When the bush 3 is press-fitted into the hole 2e of the housing 2 as shown in FIG. 4 (a), the outer peripheral portion of the bush 3 and the inner peripheral portion of the hole 2e of the housing 2 are shaved as shown in FIG. 4 (b). The waste 14 is stored in the recess 3c. In this case, since the waste 14 is held inside the recess 3c, as shown in FIG. 4C, it is suppressed that the dust protrudes and the waste 14 is discharged. Become. In this case, since the outer peripheral portion of the bush 3 and the inner peripheral portion of the hole 2e of the housing 2 are scraped on the front end side in the press-fitting direction of the bush 3, the amount of scraping decreases toward the rear end side. Therefore, the flash does not protrude from the rear end side in the press-fitting direction of the bush 3 and the waste 14 is not discharged.

  Such an effect cannot be obtained by the techniques disclosed in Patent Document 1 and Patent Document 2. For example, the technology disclosed in Patent Document 1 discloses a bush (a raised cylindrical portion 92 in Patent Document 1) in which a large number of gear protrusions are provided radially in a cross section perpendicular to the press-fitting direction. What is scraped by scraping the outer peripheral portion of the bush and the inner peripheral portion of the hole of the housing is discharged to the outside (for example, FIG. 4, FIG. ] Paragraph). In this case, there is a possibility that the outer peripheral portion of the bush and the inner peripheral portion of the hole portion of the housing are scraped to become a flash and project.

Further, the technique disclosed in Patent Document 2 discloses a bush (holder 7 in Patent Document 2) in which a burr is provided at an end portion of an inner peripheral surface. However, with such a technique, even if it is possible to suppress the flash from protruding during press-fitting, the waste is still discharged to the outside.
In addition, the techniques disclosed in Patent Document 1 and Patent Document 2 provide effects such as a reduction in press-fit load described later, a reduction in press-fit load variation, and a reduction in press-fit position dimension variation (improvement of press-fit position accuracy). I can't do that either.

FIG. 5 is a photograph for illustrating the surface state of the outer peripheral surface of a stainless steel bush.
Here, as an example, the surface state of the outer peripheral surface of the bush 13 is illustrated.
FIG. 5A is a photograph when the maximum height roughness of the outer peripheral surface of the bush 13 is Rmax 6 μm, FIG. 5B is an enlarged photograph of the outer peripheral surface of FIG. 5A, and FIG. A photograph when the maximum height roughness of the outer peripheral surface of the bush 13 is Rmax 4 μm, FIG. 5 (d) is an enlarged photograph of the outer peripheral surface of FIG. 5 (c), and FIG. 5 (e) is an outer peripheral surface of the bush 13. A photograph when the maximum height roughness is Rmax 3 μm, FIG. 5 (f) is an enlarged photograph of the outer peripheral surface of FIG. 5 (e).
FIG. 6 is a photograph for illustrating the surface state of the outer peripheral surface of the bush before and after press-fitting.
Here, as an example, the case where the maximum height roughness of the outer peripheral surface of the bush 13 is Rmax 4 μm is illustrated. 6A is a photograph for illustrating the surface state of the outer peripheral surface of the bush 13 before press-fitting, and FIG. 6B is a photograph for illustrating the surface state of the outer peripheral surface of the bush 13 after press-fitting. is there.
In FIG. 6 (b), the planar portion 15 is flattened because the surface is scraped compared to FIG. 6 (a), and the scrap 14 is stored in the recessed portion (concave portion 13c). I understand.

  The effect of providing the recesses exemplified above is to suppress the protrusion of the flash and the discharge of the dust 14, but further reduce the press-fit load, reduce the press-fit load variation, and the press-fit position size variation. The effect of reduction (improvement of press-fit position accuracy) can also be enjoyed.

FIG. 7 is a schematic cross-sectional view for illustrating the press-fitting of the bush and the press-fitting position of the bush. 7A and 7B are schematic cross-sectional views for illustrating the press-fitting state of the bush, and FIG. 7C is a schematic cross-sectional view for illustrating the press-fitting position of the bush.
FIG. 7 illustrates the case where the bush 3 is press-fitted as an example, but the same applies to the case of the bush 13.

  As shown in FIG. 7A, when the bush 3 is press-fitted, a jig 200 that holds the housing 2 and a jig 201 that presses the bush 3 are used. The jig 201 is provided with a protrusion 201a so that the press-fitting position of the bush 3 is defined. The height of the protrusion 201a is the same as the dimension from the rear end of the bush 3 to the rear end of the housing 2 (hereinafter referred to as a press-fit position dimension L).

First, as shown in FIG. 7A, the housing 2 is held by the jig 200, and the bush 3 is pressed by the jig 201 to press-fit the bush 3 into the hole 2 e of the housing 2.
At this time, as shown in FIG. 7B, the press-fitting position of the bush 3 is defined by the protrusion 201 a provided on the jig 201.
That is, as shown in FIG. 7C, the press-fit position of the bush 3 is defined so that the press-fit position dimension L is constant.
In this case, if a too large press-fitting load is required for press-fitting, the housing 2 and the like may be deformed, and the bush 3 may not be press-fitted into a predetermined position. Even if the bush 3 is press-fitted in the vicinity of the predetermined position, the press-fit position dimension L varies.

Here, when the variation in the press-fit position dimension L increases, the variation in the position of the stub 5 increases. For this reason, the variation in the dimensional relationship between the stub 5 and the photoelectric conversion element package 100 increases, and the variation in the characteristics of the optical receptacle 1 may increase.
In addition, if the press-fit load is excessively large, breakage or the like may occur, and if the press-fit load varies greatly, management in manufacturing may be difficult.

FIG. 8 is a graph for illustrating the relationship between the press-fit load and the press-fit position dimension.
8A shows a bush (for example, see FIGS. 3A and 3B) in which a concave portion is not provided on the outer peripheral surface. FIG. 8B shows a groove-like concave portion on the outer peripheral surface 3b. This is the case of the bush 3 provided with 3c. In FIG. 8B, “■” indicates that the axial dimension W of the press-fit portion is 0.03 mm, “▲” indicates that the axial dimension W of the press-fit portion is 0.07 mm, and “×” indicates When the axial dimension W of the press-fit portion is 0.11 mm, “*” is when the axial dimension W of the press-fit portion is 0.15 mm.

As shown in FIG. 8 (a), in the case of a bush having no recess, the press-fit load increases and the press-fit load varies. In this case, it can be seen that the press-fit position size decreases as the press-fit load increases, and the bush cannot be press-fitted to a predetermined position. In addition, the variation in the press-fitting position dimension is increased.
On the other hand, as shown in FIG. 8B, if the groove-shaped recess 3c is provided on the outer peripheral surface 3b, the press-fit load can be reduced and the variation in the press-fit load can be reduced. it can. Further, the press-fit position dimension can be set to a value close to a predetermined value, and variations in the press-fit position dimension can be reduced.

FIG. 9 is also a graph for illustrating the relationship between the press-fit load and the press-fit position dimension.
FIG. 9A shows a bush having a concave portion on the outer peripheral surface (for example, see FIGS. 3A and 3B). FIG. 9B shows a plurality of bottoms on the outer peripheral surface 13b. This is the case of the bush 13 provided with the hole-shaped recess 13c. In FIG. 9B, “■” indicates that the maximum height roughness of the outer peripheral surface is Rmax 6 μm, “▲” indicates that the maximum height roughness of the outer peripheral surface is Rmax 4 μm, and “×” indicates the maximum height of the outer peripheral surface. This is a case where the height roughness is Rmax 3 μm.

As shown in FIG. 9A, in the case of a bush without a recess, the press-fit load increases and the variation of the press-fit load also increases. In this case, it can be seen that the press-fit position size decreases as the press-fit load increases, and the bush cannot be press-fitted to a predetermined position. In addition, the variation in the press-fitting position dimension is increased.
On the other hand, as shown in FIG. 9 (b), if a plurality of bottomed hole-shaped concave portions 13c are provided on the outer peripheral surface 13b, the press-fit load can be reduced and the press-fit load varies. Can also be reduced. Further, the press-fit position dimension can be set to a value close to a predetermined value, and variations in the press-fit position dimension can be reduced.
Further, as can be seen from FIGS. 8B and 9B, if a plurality of bottomed hole-shaped recesses 13c are provided, the groove-shaped recesses 3c may be provided, although slightly. The press-fit load can be reduced, and variations in the press-fit load can be reduced.

FIG. 10 is a graph for illustrating the relationship between the axial dimension W of the press-fit portion and the press-fit load.
Table 1 summarizes the data shown in FIG.


As can be seen from FIG. 10 and Table 1, the size and variation of the press-fit load can be changed by changing the axial dimension W of the press-fit part.
In this case, as the axial dimension W of the press-fit portion is reduced, the press-fit load is reduced and the variation tends to be reduced.
As described above, the axial dimension W of the press-fit portion is preferably 0.02 mm or more and 0.13 mm or less, more preferably 0.03 mm or more and 0.11 mm or less. This can be seen from the data shown in FIG.

FIG. 11 is a graph for illustrating the relationship between the maximum height roughness of the outer peripheral surface of the bush 13 provided with the plurality of bottomed hole-shaped concave portions 13c and the press-fitting load.
As described above, when the maximum height roughness is Rmax 1.5 μm, the recess 13 c is not provided.
Table 2 summarizes the data shown in FIG.


As can be seen from FIG. 11 and Table 2, the magnitude and variation of the press-fit load can be changed by changing the maximum height roughness of the outer peripheral surface.
In this case, the larger the maximum height roughness of the outer peripheral surface (the more rough the surface roughness), the smaller the press-fit load and the smaller the variation.
As described above, it is preferable that the maximum height roughness of the outer peripheral surface provided with the recess 13c is Rmax 4 μm or more. This can also be understood from the data shown in FIG. 11 and Table 2.

FIG. 12 is a graph for illustrating the relationship between the tightening allowance and the press-fit load.
In addition, FIG. 12 is a graph for illustrating the relationship between the tightening allowance and the press-fitting load related to the bush 13 provided with a plurality of bottomed hole-shaped concave portions 13c as an example.
In the figure, “♦” indicates a bush with no concave portion on the outer peripheral surface, “■” indicates that the maximum height roughness of the outer peripheral surface is Rmax 6 μm, and “▲” indicates the maximum height roughness of the outer peripheral surface. In the case of Rmax 4 μm, “●” indicates the case where the maximum height roughness of the outer peripheral surface is Rmax 3 μm.
FIG. 12A shows the case where the tightening range is 0.012 mm, and FIG. 12B shows the case where the tightening range is 0.03 mm.

As can be seen from FIGS. 12A and 12B, if the recess 13c is provided, the press-fit load can be reduced even if the tightening margin value is increased or the tightening margin value range is widened. be able to. In addition, variations in press-fit load can be reduced.
In this case, if the maximum height roughness of the outer peripheral surface is set to Rmax 4 μm or more, the press-fit load can be reduced even if the tightening margin value is increased or the tightening margin range is widened. Can do. Moreover, the variation in press-fit load can be further reduced.

  1 optical receptacle, 2 housing, 2a base, 2b space, 2c jaw, 2d inner peripheral surface, 2e hole, 3 bush, 3a hole, 3b outer peripheral surface, 3c recess, 4 sleeve, 4a hole, 5 stub, 5a ferrule 5b optical fiber, 13 bush, 13a hole, 13b outer peripheral surface, 13c recess, 14 scrap, 15 planar portion, 100 photoelectric conversion element package, 110 ferrule, 110a optical fiber, 200 jig, 201 jig, 201a protrusion , L Press-fit position dimension, W width dimension

Claims (9)

A bush holding the stub;
A housing having a hole into which the bush is press-fitted, and
An optical receptacle comprising:
The bush and the housing are made of metal.
At least one of the outer peripheral surface of the bush and the inner peripheral surface of the hole is provided with press-fitting portions and concave portions alternately in the axial direction ,
At least one of the outer peripheral surface of the bush and the inner peripheral surface of the hole is provided with at least two of the press-fit portions and the groove-shaped concave portion provided between the two press-fit portions,
The press-fitting part before the press-fitting has a surface shape,
The optical receptacle , wherein the axial dimension of the press-fitting portion before the press-fitting is 0.02 mm or more and 0.13 mm or less . The dimension of the axial direction of the press-fitting portion before press-fitting is the above 0.03 mm, claim 1 Symbol placement of the optical receptacle is equal to or less than 0.11 mm. The optical receptacle according to claim 1 or 2 , wherein a pitch dimension of the press-fitted portion before the press-fitting is 0.05 mm or more. Wherein the dimension in the direction perpendicular to the axial direction of the recess before the press fitting is the optical receptacle according to any one of claims 1-3, characterized in that at 4μm or more. The optical receptacle according to any one of claims 1 to 4, wherein a material of the bush and the housing is stainless steel. A bush holding the stub;
A housing having a hole into which the bush is press-fitted, and
An optical receptacle comprising:
The bush and the housing are made of metal.
At least one of the outer peripheral surface of the bush and the inner peripheral surface of the hole is provided with press-fit portions and recesses alternately in the axial direction,
At least one of the outer peripheral surface of the bush and the inner peripheral surface of the hole is provided with a plurality of the bottomed hole-shaped recesses spaced apart from each other,
By providing the recess, the maximum height roughness before the press-fitting of at least one of the outer peripheral surface of the bush and the inner peripheral surface of the hole is set to Rmax 4 μm or more. Optical receptacle. The optical receptacle according to claim 6 , wherein the recess is formed using a barrel polishing method. The optical receptacle according to claim 6 or 7, wherein a material of the bush and the housing is stainless steel.   The optical receptacle according to any one of claims 1 to 8, wherein the concave portion stores waste generated during press-fitting.