JPS6320968Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical link assembly, and more particularly to an optical link assembly that is incorporated into a receptacle body to which an optical plug is connected.

2. Description of the Related Art In general, an optical link assembly has a configuration in which a bowl-shaped cap is attached to a substrate on which a light receiving element and a light emitting element are mounted so as to cover each element.
Here, a spherical lens is fixed to the cap, and the cap needs to be positioned and fixed with high precision so that the spherical lens accurately faces each element.

The optical link assembly shown in "Receptacle assembly for optical transceiver module" in Utility Application No. 148765/1987, which was previously proposed by the present applicant, corresponds to both ends of the board and both ends of the cap. In this structure, the cap is positioned with respect to the substrate by providing a notch portion to match the notch portions.

Problems that the invention aims to solve For this reason, in order to attach the cap to the board, a jig with a positioning pin embedded into which the notch fits is required, and in order to attach the cap,
First, it is necessary to attach the board by fitting the notch to the positioning pin, and then attach the cap by fitting the notch to the positioning pin, which increases the number of assembly steps.

An object of the present invention is to provide an optical link assembly that solves the above problems.

Means for Solving the Problems The present invention provides a substrate with a recess on one side and a cutout recess on the other side with respect to the photoelectric conversion element, and a protrusion and a tongue on both sides of the cap in the longitudinal direction. and
The cap is positioned by fitting the protrusion and the tongue of the cap into the recess and the cut-out recess of the base plate at spaced positions, respectively.

Function: By simply placing the cap on the board, the cap can be positioned relative to the board, eliminating the need for a jig for positioning. In addition, the recesses and notches formed on the substrate, which are the positioning means, and the protrusions and tongues formed on the cap are spaced apart from each other, and therefore the positioning accuracy is low because the positioning of the cap is performed at two separate locations. can be improved.

Example Next, each embodiment of the present invention will be described.

First, an embodiment of the optical link assembly of the present invention applied to a bidirectional optical transmission system will be described.

FIG. 1 shows a receptacle assembly 1 attached to an optical transceiver module, to which an optical plug 2 is connected as shown by a chain double-dashed line. The receptacle assembly 1 roughly consists of a receptacle body 3 and an optical link assembly 4.

As shown in FIGS. 2A to D and 3 to 6, the receptacle body 3 includes a fitting part 5 into which the tip of the optical plug 2 is fitted, and a cylindrical ferrule fixed to the inner part of the fitting part 5. It consists of sections 6a and 6b, and an optical link assembly housing section 7 on the rear side. The fitting part 5 and the storage part 7 are ferrule fixing parts 6a and 6b.
are partitioned by a protruding wall 8. The housing part 7 includes elongated receiving steps 9 and 10 extending laterally along the ceiling and floor surfaces, a receiving step 11 extending between the upper and lower receiving steps 9 and 10, and a positioning step. Protrusions 12 to 15 are provided. Projection 12~
15 has a rectangular shape when viewed from the opening side of the accommodating portion 7, and is formed at four corners of the accommodating portion 7 so as to protrude from the receiving step portions 9 and 10.

The optical link assembly 4 is shown in FIGS.
As shown in the figure, it has a structure in which caps 21 and 22 are placed over an elongated rectangular substrate assembly 20.

The board assembly 20, as shown in FIGS. 9A to C, has a structure in which an auxiliary board 24 shown in FIGS. 11A to C is adhesively fixed onto a printed circuit board assembly 23 shown in FIGS. 10A and B. be.

As shown in FIGS. 10A and 10B, the printed circuit board assembly 23 includes mounting portions 2 on a ceramic substrate 25.
Photodiode 30 and IC chip 3 on 6-29
1. It has a structure in which a light emitting diode 32 and an IC chip 33 are mounted. Photodiode 30 and IC
The circuit on the receiving side in which the chip 31 is provided is likely to cause oscillation, but in this embodiment, firstly, the ground terminal of the IC chip 33 is wire-bonded to dedicated grounding patterns 34a and 34b. Oscillation is reliably prevented by preventing ground current from flowing through the mounting section 27 and, secondly, by separating the cap covering the receiving part and the transmitting part. The above earth pattern 34
a and 34b are electrically connected to the ground pattern on the back surface of the board 25 through through holes. 35, 36
are ground patterns, respectively, and are formed so as to surround the receiving section and the transmitting section. Ceramic substrate 25
A terminal pattern 37 is formed on the back surface of the terminal 38, as shown in FIGS. 7A to 7C.
is soldered. In addition, the ceramic substrate 2
No. 5 has a structure in which there is no notch at all around the periphery, making it easy to perform multi-board assembly.

As shown in FIGS. 11A to 11C, the auxiliary board 24 has the same size as the printed circuit board assembly 23, and has cutouts 24a to 24d at four corners and U-shaped cutouts 24e on the left and right sides. , 24f.
The auxiliary substrate 24 further includes rectangular openings 24g, 2.
4h, and three through holes 24i, 24j, and 24k. This auxiliary board 24 is superimposed on the printed circuit board assembly 23 and bonded so that the through hole 24i coincides with the through hole 25a of the ceramic board 25.

As a result, as shown in FIGS. 9A to 9C, the board assembly 20 has a through hole 40 located to the left of the center, and two through holes diagonally above and to the left of the center.
Recesses 41 and 42 formed by 4j and 24k, an electronic component accommodating section 45 surrounding the receiving section formed by the opening 24g on the right side and accommodating the photodiode 30 and the IC chip 31, and an opening 24 on the left side.
Notches 24a to 24d are formed at each of the four corners of an electronic component accommodating section 46 which surrounds the transmitting section and accommodates the light emitting diode 32 and the IC chip 33. The structure includes cutout recesses 47 to 50 and cutout recesses 51 and 52 formed by cutout portions 24e and 24f on the right side and the left side, respectively.

The caps 21 and 22 are both made of press-molded brass plates, and have bowl-shaped cap parts 21a and 22a.
and frame portions 21b and 22b surrounding this.
Ball lenses 5 are provided in the cap portions 21a and 22a, respectively.
3 and 54 are fixed with adhesive. In the frame portion 21b,
Convex portion 21b- ₁ corresponding to concave portion 41, notch concave portion 5
A tongue piece 21b- ₂ corresponding to 1 is formed, and a convex portion 22b-2 corresponding to the concave portion 42 is also formed on the frame portion 22b.
_1. A tongue piece 22b- ₂ corresponding to the notch recess 52 is formed. Convex portions 21b- ₁ , 22b- ₁ and tongue piece 2
The dimensions of 1b- ₂ and 22b- ₂ are those of the recesses 41 and 4, respectively.
2 and the cutout recesses 51 and 52 so as to fit closely together without play. Further, as shown in FIGS. 9A and 9C, a recess 41 formed in the auxiliary substrate 24
The distance between the recess 51 and the recess 51 is large, and the distance between the recess 42 and the recess 52 is large. Correspondingly, as shown in FIG. _7A and _{FIG .
-2} are formed on both sides of the caps 21 and 22 in the longitudinal direction, and the distance between them is large. Therefore, the cap 21 for the auxiliary board 24,
In order to perform the positioning of 22 at two separate locations,
Positioning accuracy can be improved.

The above-mentioned cap 21 has a convex portion 21b- ₁ that fits into the concave portion 41 and is positioned in a radial direction centering on the concave portion 41, and a tongue piece 21b- ₂ .
is fitted into the cutout recess 51 and positioned in the rotational direction, and is adhesively fixed to the substrate assembly 20, and the ball lens 53 accurately faces the photodiode 30. Similarly to the above, in another cap 22, the convex portion 22b- ₁ fits into the rotating portion 42, and the tongue piece 22
b- ₂ is fitted into the cutout recess 52, positioned in the radial direction and rotational direction around the recess 42, and is adhesively fixed to the board assembly 20,
The ball lens 54 is exactly opposite the light emitting diode 32. Therefore, the caps 21 and 22 themselves have positioning means, and no positioning jig is required when attaching the caps. This allows for highly accurate positioning and easy assembly.

Also, the frame portions 21b of the caps 21 and 22,
22b has cutout recesses 47, 48 and 49, respectively.
Notches 21b- ₃ , 21b- ₄ , 22 corresponding to 50
b- ₃ , 22b- ₄ are formed, and cap 2
1 and 22 are attached without protruding into the cutout recesses 47 to 50. Furthermore, caps 21, 2
2 has a shape that avoids the through hole 40. Also,
The dimensions of the caps 21 and 22 are determined such that when the caps 21 and 22 are attached to the printed circuit board assembly 23, the outer peripheries of the caps 21 and 22 are located inside the outer periphery of the printed circuit board assembly 23 by a distance g. Therefore, as will be described later, even if the dimensions of the printed circuit board assembly 23 in the multi-board state before board allocation are somewhat small, the caps 21, 22
This is advantageous because it can be normally attached without protruding beyond the outer peripheral edge of the printed circuit board assembly 23, that is, without coming into contact with an adjacent cap.

The optical link assembly 4 described above consists of bonding the auxiliary board 24 to the multi-board printed circuit board assembly 23 → photodiode 30, light emitting diode 32,
Mounting of IC chips 31 and 33 → Wire bonding → Installation of caps 21 and 22 → Ball lens 5
3. Fixing 54 → Splitting the board → Installing terminal 38 →
Installing the capacitor on the back → caps 21 and 22
Manufactured in soldering order. Note that the caps 21 and 22 are soldered using the tongue pieces 21b- ₂ and 22b.
− ₂ and the ground pattern on the board. This connects the caps 21 and 22 to ground.

The above-mentioned optical link assembly 4 is incorporated into the accommodating portion 7 of the receptacle body 3, as shown in FIG. That is, in the plane direction perpendicular to the direction of the arrow X, the optical link assembly 4 has the through hole 40 fitted into the positioning pin 16 protruding from the receiving step portion 11, so that the optical link assembly 4 can be positioned in the radial direction about the pin 16. In addition, the notch recesses 47 to 50 at the corners engage with the corresponding positioning protrusions 12 to 15 (see Fig. 7A), so that the position in the rotation direction is regulated, and the position in the direction of arrow X is regulated. covers the back side 55
supported by a rubber plate 56 pressed by
The front side is in contact with the receiving step portions 9, 10, 11, and its position is regulated. The cover 55 is attached by engaging the claws 55a, 55b on both sides with the slits 17, 18 of the receptacle body 3. As described above, the position of the optical link assembly 4 in the rotational direction is controlled by using the cutout recesses 47 to 50, and even if there is a burr on the outer periphery of the board assembly 20, the influence of the burr is reduced. optical link assembly 4 without being
is positioned with high precision. In other words, when regulating the position using the outer periphery of the board assembly as in the past, the board assembly itself is required to have highly accurate external dimensions and to be free of burrs. However, in the case of positioning as described above, the dimensional accuracy required for the board assembly itself is relaxed compared to the conventional method, which is advantageous because multiple boards can be used and it is suitable for mass production.

By installing the optical link assembly 4 with its position restricted as described above, the ball lenses 53 and 54
are positioned so as to accurately oppose the ferrule fixing parts 6b and 6a, respectively.

When the optical plug 2 is connected to the above receptacle assembly 1 as shown in FIG.
The optical fibers 2c and 2d in b are in a positional relationship that coincides with the optical axes of the ball lenses 54 and 53, respectively, as shown in FIG.

As shown in FIG. 12, the spherical lenses 53 and 54 are both the same lenses with a focal length f of 0.73 mm. The spherical lens 54 on the transmitting side is disposed at a position 2f from the light emitting diode 32, and the optical fiber 2c is disposed such that its end face is at a position 4f-x from the light emitting diode 32. Here x is 0.31mm. The optical fiber 2c is usually a light emitting diode 32.
However, when we conducted an experiment in which the energy of the light emitted from the other end of the optical fiber 2c of a predetermined length was extracted as electric power by a photoelectric conversion device, we found that the optical fiber 2c from the normal position to the light emitting diode 32
If you shift the dimension x to the side, the output power level will be -
It was found that the noise level increased from 22 dBm to -20 to -21 dBm. Therefore, in this embodiment, the optical fiber 2
As shown above, the end face of c is a light emitting diode 32.
The optical plug 2 is disposed at a position of 4f-x, so that information can be transferred from the receptacle assembly 1 to the optical plug 2 more efficiently. Further, the receiving side ball lens 53 is disposed at a position 3f-x from the photodiode 30, that is, at a position f from the end face of the optical fiber 2d.

Next, an embodiment of the optical link assembly of the present invention applied to a unidirectional optical transmission system will be described.

FIG. 13 shows a receptacle assembly 60 attached to an optical receiver module. The receptacle assembly 60 generally includes a receptacle body 61 and an optical link assembly 62.

As shown in FIGS. 14A to 14D and FIG.
, a ferrule fixing section 64 , and an optical link assembly housing section 65 . The optical plug 58 is fitted into the fitting part 63 as shown by the two-dot chain line in FIG.
The ferrule 59 is inserted into the fixing part 64, and the locking pin (not shown) is inserted into the hook-shaped locking grooves 66a, 6.
6b and connected to the receptacle assembly 60.

The housing portion 65 is formed with elongated receiving step portions 67 and 68 and positioning protrusions 69 to 72 that extend laterally along the ceiling and floor surfaces thereof. The protrusions 69 to 72 have a rectangular shape when viewed from the rear opening side of the accommodating part 65, and are formed at four corners of the accommodating part 65 so as to protrude from the receiving step parts 67 and 68.

The optical link assembly 62, as shown in FIGS. 16A to C, has a structure in which a cap 74 is placed over an elongated rectangular board assembly 73 shown in FIGS. 17A to C.

The substrate assembly 73 includes a photodiode 75 and
It has a structure in which an auxiliary board 78 is bonded onto an elongated rectangular printed circuit board assembly 77 to which an IC chip 76 is bonded and fixed. The four corners of the board assembly 73 have notched recesses 73a to 73d formed by the notches of the auxiliary board 78, the right side has notched recesses 73 ₂ formed by the notches of the auxiliary board 78, and the top surface has:
A recess 73f and an electronic component accommodating portion 73g are formed by the through hole and the through window of the auxiliary board 78.

In the cap 74 supported by the ball lens 79, the convex portion 74a fits into the concave portion 73f to restrict the position in the radial direction centering on the concave portion 73f, and the tongue piece 74b fits into the notch concave portion 73e. They are fitted and installed in a positioned state with their position in the rotational direction regulated. Further, notches 74c to 74f are formed at the four corners of the cap 74, and the edges of each of the notches 74c to 74f are formed in the notched recesses 7, respectively.
It protrudes somewhat within 3a to 73d.

As shown in FIG. 16A, the optical link assembly 62 has a protrusion 69 to which each cutout recess 73a to 73d corresponds.
72 and are positioned at the corner portions as will be described later, and as shown in FIG. It is attached in a pressed state. In particular, when looking at the surface direction of the board assembly 73 of the optical link assembly 62, each notch 7 of the cap 74 is shown in an enlarged view in FIG.
Each edge 74c- ₁ , 74c- ₂ of 4c to 74f...
Projections 69 to 72 to which 74f- ₁ and 74f- ₂ correspond
It is positioned and attached in both directions of arrows Y and Z in the figure, in contact with the surface of FIG.

Note that when positioning the optical link assembly 62, the present invention is not limited to the above, and it is of course possible to directly utilize the cutout recesses 73a to 73d of the board assembly 73.

Further, the configuration of the optical link assembly of the receptacle assembly on the transmitting side is substantially the same as the optical link assembly 65 described above, and the configuration for positioning and fixing the optical link assembly to the receptacle body is also the same as above. , the explanation thereof will be omitted.

Effects of the Invention As described above, according to the optical link assembly of the present invention, since the cap itself and the board to which it is attached have means for regulating the attachment position of the cap to the board, it is not necessary to use a positioning jig. The cap can be positioned with respect to the board without being used, and the positioning work becomes easy.Moreover, the protrusion of the cap fits into the corresponding recess to regulate the position in the radial direction, and the tongue part It has the feature that it fits into the notched recess and its position in the rotational direction is regulated, allowing for highly accurate positioning.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a receptacle assembly for a bidirectional optical transmission system in which an embodiment of the optical link assembly of the present invention is incorporated, and FIGS. 2A to 2D are a front view of the receptacle main body in FIG. Figure 3 is a cross-sectional view taken along the line - line in Figure 2B, and Figures 4 and 5 are the line - line and - line in Figure 2A, respectively. FIG. 6 is a cross-sectional view taken along line C in FIG. Bottom view, side view, FIG. 8 is a cross-sectional view taken along line 7A in FIG.
9B is a front view and a side view of the printed circuit board assembly, FIG. 9 C is a cross-sectional view taken along line C-C in FIG. 9 A, and FIGS. 10 A and B are a front view and a rear view of the printed circuit board assembly, respectively Figures 11A and 11B are respectively a front view and a side view of the auxiliary board, and Figure 11C is XIC-
A cross-sectional view taken along the XIC line, FIG. 12 is a diagram showing the positional relationship of the spherical lens and the optical fiber to the light receiving and emitting elements, and FIG. 13 is a diagram incorporating another embodiment of the optical link assembly of the present invention. Cross-sectional views of the receptacle assembly of the unidirectional optical transmission system, FIGS. 14A to 14D, respectively. In FIG. 13, the front view, right side view, left side view, and bottom view of the receptacle body. Cross-sectional view along the XV-XV line, Figure 16A,
B is a front view and a side view of another embodiment of the optical link assembly of the present invention, and FIG. 16C is XC- in FIG.
17A and 17B are respectively a front view and a side view of the board assembly, and FIG. 17C is a cross-sectional view taken along the XC-XC line in FIG. The figure shows the positioning state of the optical link assembly of FIG. 16A. 1,60... Receptacle assembly, 2,58...
...Optical plug, 3,61...Receptacle body,
4, 62...Optical link assembly, 21, 22, 74
...Cap, 21b- ₁ , 22b- ₁ , 74a...
... Convex portion, 21b- ₂ , 22b- ₂ , 74b... Tongue piece, 23... Printed board assembly, 24... Auxiliary board, 41, 42, 73f... Concave portion, 51, 5
2, 73e...notch recess, 53, 54, 79...
ball lens.

Claims (1)

[Scope of utility model registration request] A configuration in which a bowl-shaped cap is installed in a receptacle to which an optical plug is connected so as to face the tip of the connected optical plug, and is provided with a photoelectric conversion element and a lens covering the photoelectric conversion element on the substrate. In the optical link assembly, the substrate includes:
A concave portion and a notched concave portion are provided spaced apart from each other, a convex portion corresponding to the concave portion is provided on one longitudinal side of the cap, and the notched concave portion is provided on the other longitudinal side of the cap that is spaced from the convex portion. The cap is positioned relative to the substrate in the radial direction by fitting the protrusion into the recess, and the tongue is fitted into the notch recess to rotate the cap. An optical link assembly configured to be positioned and mounted with respect to a direction of motion.