JPS62138807A - Assembling method for optical plug - Google Patents

Abstract

PURPOSE:To stabilize the quality of a plug by integrating an optical transmitting and/or receiving unit and a ferrule pipe in one body through a pipe at a stage before a holder is fitted. CONSTITUTION:The tip of the ferrule 37 is pressed in and fixed on the opposite side of the pipe 11, the unit has its rotating and axial movement limited and is fixed in the pipe 11, and the ferrule 37 is fixed to he pipe 11. The unit 22 and ferrule 37 are integrated through the pipe 11. Fiber cables at one terminal of a two-core fiber cable 12 are clamped and fixed in the holder 38 respectively. The holder 38 is pressed in and fixed in the ferrule 37 and fibers 39a and 39b exposed from the fiber cables 12a and 12b are fixed in the ferrule 37. The tip surfaces of the fibers 39a and 39b face each other closely to a light emitting diode 3 and a photodiode IC 4.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method of assembling an optical plug, and in particular, a method of assembling an optical plug that is used by being connected to a socket and has a structure in which an optical transceiver unit l- is incorporated. Regarding.

Conventional technology In the past, an optical modem incorporating an electronic circuit, a light receiving/emitting element, and a socket was installed in the computer main body, and an optical plug incorporating a ferrule was connected to the socket to connect two combicoater main bodies. connected by fiber cable. In this method, connecting the optical plug to the socket by 1Φ means optically connecting the tip of the fiber to the light emitting/receiving element so as to face it.

On the other hand, the tip of the fiber, which is the optical connection part, and the light receiving/emitting element must be positioned with high precision, and it is not preferable for the optical connection part to be movable as described above. ) It is desirable that the ternary part be fixed in advance.

Problems to be Solved by the Invention Therefore, we developed a structure in which a light receiving/emitting element and related electronic circuits are incorporated into an optical plug, an optical connecting part is fixedly provided inside the optical plug, and a contact pin is provided at the tip. A connection method can be considered in which this is electrically connected to the socket 1 having a contact member. In this optical plug, a light receiving/emitting element and a printed circuit board were incorporated, but no particular consideration was given to the assembly method.

An object of the present invention is to provide a method for assembling an optical plug that solves the above problems.

Means for Solving the Problems The present invention provides an optical transmitting and/or receiving unit, which includes a contact pin at one end of a printed circuit board assembly and a light emitting element and/or a light receiving element at the other end, which is handled on the tip side. A process of inserting the ferrule, which holds the tip of the fiber of the fiber cable, into a pipe having a convex portion for fastening from the rear end side of the pipe, and inserting the ferrule into the vibrator into which the optical transmitting and/or receiving unit is inserted. A step of press-fitting into the rear end side to integrate the optical transmitting and/or receiving unit and the ferrule via the pipe, and a step of fitting and fixing a cylindrical holder around the pipe. It's a lot of things.

EMBODIMENT OF THE INVENTION Next, an embodiment of the optical plug assembly method according to the present invention will be described.

First, the connector will be explained. ] The connector includes an optical plug 1 having an optical transceiver module structure shown in FIGS. 1(A) and (B), and the connector shown in FIGS. 2 to 5, FIGS. It consists of socket 2.

As shown in FIGS. 1A and 1B, the optical plug 1 has a light-emitting diode 3, a photodiode IC 4, and a circuit board assembly 5 for signal processing incorporated therein, and a reception data The contact pin 1-bin 6, grounding contact pin 7, transmission data contact pin 8, and power supply contact pin 9 and 10 are surrounded by a metal shielding pipe 11 and protrude, and the two-core fiber cable 1
It is installed on both ends of 2.

As shown in FIGS. 2 to 5, the socket 2 includes a receiving data contact member 13, a grounding contact member 1, and a grounding contact member 1.
4. The transmission data contact member 15 and the power supply contact member 16 and 17 are incorporated into the socket 1 body 18, which is a synthetic resin molded product, and are engaged by a cover member 19 attached from the back side to prevent them from coming off. It is a fixed configuration, for example, fixed to a printed circuit board of the computer body and provided on the back side of the computer body.

By connecting the optical plug 1 to the socket 2, the two combi coater bodies are connected by the two-core fiber cable 12.

The light emitting diode 3 and photodiode IC4 are the 03rd
As shown in the figures (Δ) to (D), it is mounted on a substantially cylindrical ceramic support base 20 . This support stand 20,
As shown in FIGS. 7(△) to (C), a substantially cylindrical holding member 21 penetrating and holding each contact pin 6 to 10 has a corresponding fitting groove 20a, 21a. The rear protruding portions 5a of the contact pins 6 to 10 are fitted to both ends in the longitudinal direction of the long rectangular pudding 1 to the circuit base 23.
- 10a to the corresponding electrodes 70, 71, 72 (others not shown) of the printed circuit board 23-
Furthermore, as shown in FIGS. 6(B) to (1), the two terminals 73°7 of the light emitting diode 3
4 to the corresponding electrodes 75, 76 on the printed circuit board 23
Miki's terminal 7 of photodiode IC4 is soldered to
7, 78, and 79 are soldered and fixed to corresponding electrodes 80, 81, and 82 on the printed circuit board 23, thereby forming the optical transmitting/receiving unit 22. 83 is the soldering () part, available in satin pattern.

The printed circuit board 23 is arranged so as to extend in the same direction as the direction in which the light emitting diode 3 and the photodiode lc4 are lined up, and the ends of the board are connected to the terminals 73 and 7 of the light emitting diode 3.
4 and between terminals 77.79 and 7 of photodiode I04.
It is interposed between 8 and 8. Therefore, when the printer 1 to the circuit board 23 and the support base 20 are assembled using the groove 20a, the terminals 73, 74, and 77 to 79 will face the terminals to be soldered, respectively, and will emit light. diode 3
and a support stand 20 on which a photodiode [C4 is attached]
It is easy to assemble the circuit board 23 and the printed circuit board 23.

The printed circuit board 23 also has contact pins 6.7.
．． 8, and is interposed between the rear protrusions 6a to 8a of the contact pins 6 to 8 and the rear protrusions 9a and 10a of the contact pins 9 and 10. There is. Therefore, when the printed circuit board 23 and the holding member 21 are attached using the groove 21a, the rear protrusions 6a to 8a, 9a, and ioa will face the corresponding electrodes, and the holding member 21 and printed circuit board 2
It is easy to assemble with 3.

Further, the terminals 73, 74, 77 and the rear projections 6a to 10a are bent toward the groove 21a, and the printed circuit board 23 is fitted into the grooves 20a and 21a. The tip ends of each are elastically pressed against the electrodes to elastically clamp the printed circuit board 23.

For this reason, soldering is performed between the previous printed circuit board 23 (printed circuit board assembly 5) and the support stand 20. The temporarily fixed state with the holding member 21 is stable, and in this respect, the optical transceiver unit ~
22 is easy to assemble.

Further, as shown in FIG. 6(C) and FIG. 7(B), the terminal 79 for grounding is located between the terminals 73 and 80, causing interference between the terminals 73 and 80. Niri). Figure 7(B).

As shown in (C), the grounding contact pin 7 is located between the contact pins 6 and 8.
．． 8) is less likely to occur.

The printed circuit board assembly 5 has a structure in which an IC chip 24, transistors 25 and 26, and chip capacitors 27 and 28 are mounted on a printed circuit board 23. The above unit 22 has a circuit configuration as shown in FIG.

The optical signal received by the photodiode IC4 undergoes waveform shaping etc. within the photodiode tcd, is level-converted to the level for 0MO3 via the interface circuit 29, and is outputted from the contact pin 6 as an electrical signal. The electrical signal input to the contact pin 8 is applied to the light emitting diode drive circuit 30, and two forces from this are applied to the light emitting diode 3 via the constant current circuit 31i, causing it to emit light.

In conventional circuits that are not provided with the constant current circuit 31, the range of voltage applied to the terminal 10 is limited to 4.75 to 5.25 V in order to keep the drive current constant. By providing the circuit 31, the driving current of the light emitting diode 3 can be kept constant even when the voltage applied to the terminal 10 fluctuates over a wider range of 3.2 to 6.5 V than in the above example. . That is, the permissible variation range for the voltage applied to the terminal 10 is advantageously widened.

As shown in FIGS. 7(A) to (C), the peripheral surface of the holding member 21 has triangular cross-sections 32a, 32b, and 32c, which extend in the axial direction of the holding member 21, and square cross-sections. Grooves 33a, 33b, and 33c are formed at non-uniform intervals.

As shown in FIGS. 9(A) to 9(C), the vibrator 11 has protrusions 34a to 34c with a triangular cross section corresponding to m32a to 32c, and inner ridges corresponding to m33a to 33C. The cut and raised pieces 35a to 35c are formed.

β1 in FIGS. 7(C) and 9(C). δl is 135 respectively
°, β2. β3. δ2. δ3 is 112.5°, γ, γ2, ε1. ε2 is 150 degrees, and γ3 is 60''. Small openings 36a and 36b are formed on the left and right sides near the tip of the vibrator 11.

The above unit 22 includes the retaining member 21 32a to 32.
c is fitted with the corresponding protrusion 34a to 34c to be positioned upwardly in the circumferential direction and rotation is restricted, and as shown in FIG. ~35G and is incorporated into the vibrator 11 in a state in which movement in the direction of the arrow is restricted, that is, removal from the vibrator 11 is restricted.

Note that the tip of the ferrule 37 is press-fitted and fixed on the opposite side of the vibrator 11, as shown in FIGS. 1 and 10. As a result, the unit 22 is fixed within the vibrator 11 with rotation and axial movement restricted, and the ferrule 37 is fixed to the pipe 11.
and the ferrule 37 are integrated via the vibrator 11.

As shown in FIG. 1, each fiber couple 12a, 12b at one end of the two-core fiber cable 12 is clamped and fixed within a holder 38, respectively.

The holder 38 has 11 people fixed inside the ferrule 37,
Fibers 39a and 39b exposed from each fiber cable 12a and 12b are fixed within the ferrule 37.

The end surfaces of each fiber 39a, 39b are close to and face the light emitting diode 3 and photodiode 104, respectively.

The ferrule 37 is positioned relative to the support base 20 as described below. As shown in FIGS. 6(A) and 6(B), a synthetic resin positioning member 84 shown in FIGS. 11(A) and 11(B) is fixed to the support base 20. As shown in FIGS.

This member 84 consists of a flat plate piece 85, a pair of protrusions 86° and 87 protruding from one side thereof, and a pair of protrusions 88° and 89 protruding from the other side. The member 84 has protrusions 86 and 87.
are fitted into corresponding holes 90 and 91 of the support base 20, positioned and fixed.

The tip of the ferrule 37 is shown in FIG. 12(A).

As shown in (B), positioning holes 92 and 93 corresponding to the projections 88 and 89 are formed. This ferrule 37, as shown in FIG. 1(A) and FIG. 11(B),
The holes 92 and 93 are fitted with corresponding protrusions 88 and 89, respectively, and positioned on the support base 20, and the tips of each fiber 39a and 39b are opposed to the light emitting diode 3 and photodiode IC4, respectively. .

Note that the peripheral wall of the flat plate piece 85 is also used for positioning the photodiode IC4 and the fixing base 94. Figure 6 (A
), as shown in FIG. 11(A), the rectangular photodiode IC4 is mounted in a positioned state in contact with the L-shaped side wall 85a, and the circular fixing base 94 is
It is attached in a state in which it is positioned in contact with the arc-shaped side wall 85b. A recess is formed in the fixing base 94,
The light emitting diode 3 is housed and fixed in this case. In this way, the positioning member 84 positions both the light emitting diode 3, the photodiode IC4, and the ferrule 37, so that the tips of the respective fibers 39a and 39b correspond to the light emitting diode 3 and the photodiode IC4 with high accuracy. There is.

When the support base 20 is made of ceramics, it is difficult to mold, so the positioning member 84 made of synthetic resin is used as described above.
It is preferable to prepare and fix the positioning member as a separate member, but when the support base is made of synthetic resin, it is possible to form the positioning member integrally with the support base.

40 is a cable cover, and 41 is a plug holder. The plug holder 41 covers the ferrule 37 and the vibrator 11.

The plug holder/41 has a substantially cylindrical shape as shown in FIGS. 14(A) and 14(B), and has circumferentially extending slits 41a and 1j11b formed on both sides of a predetermined location.

Further, a substantially U-shaped locking member 42 shown in FIG.
The plug holder 41 is fixed to the ferrule 37 by this locking member 42. That is, the plug holder 41 is fixed in a state covering the vibrator 11 and the ferrule 37 without using adhesive.

Note that a plug having the same configuration as the plug 1 described above is also attached to the other end side of the two-core fiber cable 12.

Note that the plug 1 having the above configuration is assembled in the order described below.

■ Insert the optical transmitter/receiver unit 22 into the shielding vibrator 11 from the rear end in the direction of the arrow.

(2) The holder 38 is press-fitted and fixed to one end of the fiber cable 12, and the ferrule 37 with the cable cover 40 attached is press-fitted into the vibrator 11.

(2) Insert the plug bolter 41 from the contact pin side to fit it to the vibrator 11, and press-fit the engaging member 42 to fix it.

As shown in FIG. 2, the socket body 18 includes a cylindrical portion 50 that accommodates the contact member and an annular space 51 surrounding the cylindrical portion 50.
has.

Around the cylindrical part 50, protrusions 34a to 34 of the vibrator 11 are provided.
D'i 52 a having a triangular cross section corresponding to G.

52b and 52C are formed extending in the axial direction. In FIG. 2, θ1 is 135°, θ2. θ3 is 112 respectively
．． 5".

Further, as shown in FIG. 3, the grounding contact member 14
In addition to the first contact portion 14af that contacts the grounding contactor 1 to the pin 7, the second contact portion 14af that contacts the vibrator 11
It has 4b. The second contact portion 14b is connected to the annular space 5.
It is located at the lower part of 1.

Further, as shown in FIGS. 4 and 5, the contact member 1
7 (16) and 13 (15) are contact pins 1, respectively.
0 (9), 8 (6) contact part 17a (1
6a), 13a (15a).

Both contact portions have a fork shape.

Further, on the front surface of the columnar portion 50, a contact portion 13a, a first contact portion 14a, and contact portions 15a and 16a are provided.

Holes 53 to 57 into which the contact pins are inserted are formed corresponding to the holes 17a.

The above optical plug 1 has protrusions 34a to 34c each having i74
52a to 52C and press in the direction of the arrow in FIG. 1, the vibrator 10 is inserted into the annular space 51 and the second contact portion 14b is inserted, as shown in FIG. The contact pin 7 passes through the hole 54 and spreads out the first contact portion 14a to weld with it, and as shown in FIG. 4, the contact pin 9
, 10 are holes 56. ．． 57 and the contact portion 16a,
17a, and as shown in FIG. connected to.

When the optical plug 1 is connected to the socket 2, the computers are connected, and the electrical output signal from the first computer to which the socket 2 is attached is transmitted through the contact member 15 and the contact pin 8. The output current from the circuit 30 is applied to the light emitting diode 3 via the circuit 31, which emits light in response to the above output signal. is converted into an optical signal, and this optical signal is then passed through the fiber 3.
9a to the second computer.

The reflecting table 94 is made of brass and is plated with Ni, as shown in FIGS. 6(A), (B) and 13-(A).

As shown in (B), an inverted conical reflecting surface 95 is formed to surround the light emitting diode 3. Reflective surface 9
The angle α of 5 is determined to be an angle at which light emitted from the side surface of the light emitting diode 3 is reflected toward the distal end surface of the fiber 39a. Therefore, not only the light emitted from the front side of the light emitting diode 3 but also the light emitted from the side surface is reflected on the slope 58.
The light is reflected by the beam, enters the fiber 39a, and is used as part of the optical signal. Therefore, the light emitted from the light emitting diode 3 is effectively used as an optical signal transmitted through the fiber 39a without waste.

The signal from the second computer is transmitted as an optical signal through the fiber 39b, is received by the photodiode IC4, is converted into an electrical signal, and is further passed through the circuit 29 of FIG. 6, supplied to the first computer via the contact member 13; In this case, since the photodiode IC4 in which the photodiode part and the IC part are integrated is used, the electric signal converted by the photodiode part is immediately amplified and compared in the IC part, and the waveform is shaped and output. Therefore, there is no noise mixing between the photodiode and the IC, which would occur if the photodiode and the IC were installed separately, and the S/N ratio is improved.

FIG. 16 shows a part of a modification of the optical plug. In the figure, the same reference numerals are given to the parts that substantially correspond to the parts shown in FIG. 1('A), and the explanation thereof will be omitted.

In this optical plug 100, the light emitting diode 3 and the photodiode IC 4 are spaced apart from each other by two fibers 39a of the fiber cable 12.

The spacing between 39b and 39b is determined to be equal. Therefore, the distal end side of the two-piece flexible back pull 12 is held in the holder 38 in an intact state without being torn.

In order to perform bidirectional transmission, as shown in FIG. 17, the optical plug 1 is attached to the right end of the dual fiber cable 12, and the optical plug 1A is attached to the left end. Optical plug 1 and 1A
As is clear from the explanation below, they are the same parts,
Components constituting the optical plug 1A are designated by the reference numerals of the components constituting the optical plug 1 with a suffix A added thereto. The right end of the - fiber 39a faces the light emitting diode 3, and the left end faces the photodiode IC4A. another fiber 3
The right end of 9b faces the photodiode IC4, and the left end faces the light emitting diode 3A. Further - fiber 39
Corresponding to the right end of a is a contact pin 15 for transmission data.
, a contact pin 6△ for receiving data is provided corresponding to the left end. There is a contact pin 6 for reception data corresponding to the right end of another fiber 39b, and a contact pin 8ASI for transmission data corresponding to the left end. Therefore, optical plug 1A
is the same part as the optical plug 1, which is convenient for manufacturing.

In addition, light emitting diode 3 (3△) and photodiode IC
4 (4A), and contact pin 6 (6
A) and reception data contacts 1 to 8 (8A) are both arranged horizontally.Correspondingly, the printed circuit board assemblies 5 and 5Δ are horizontal.

On the other hand, in the socket 2, the transmission data contact member 15 and the reception data contact member 13 are arranged side by side in correspondence with the arrangement of the contact pins 8 and 6 of the optical plug 1. In another socket 1-2A, optical plug 1
Corresponding to the arrangement of contact pins 6A and 8Δ of A, contact members 13A for reception data and contact members 15A for transmission data are arranged side by side.

In order to connect the two computer bodies to which sockets 2 and 2A are attached with a fiber cable, when the computer bodies are installed with their backs facing each other, sockets 2 and 2A are the sockets 2 and 2A. The transmission data contact member 15 of the socket 2A faces the reception data contact member 13A of another socket 2A, and the reception data contact member 13 of the - socket 2 faces the transmission data contact member 15Δ of another socket 2A. are doing. Therefore, the optical plugs 1 at both ends of the dual fiber cable 12
, 1A to each socket 2.2A, there is no need to turn the optical plug 1, 1A half a turn;
The two fiber cables 12 need not be twisted. This is particularly advantageous when the length of the dual fiber cable 12 is short and difficult to twist.

Effects of the Invention According to the method for assembling an optical plug of the present invention, the optical transmitting and/or receiving unit and the ferrule are integrated via the pipe before fitting the holder, so the assembly work can be streamlined. It has the advantage of being suitable for producing large quantities of plugs with stable quality.

[Brief explanation of drawings]

FIGS. 1(A) and (B) are a sectional view and a front view of a plug assembled by an embodiment of the optical plug assembly method according to the present invention, respectively, and FIG. B) The front view of the socket to which the optical plug is connected, FIGS.
6(A) is a front view of the support base on which the light emitting diode and photodiode IC are fixed, and FIG. 6(B) is a cross-sectional view taken along line VIB-VIB in FIG. 6(C) and (D) are a rear view and a bottom view of the support stand, respectively, and FIGS. 7(A) to (C) are a side view, a top view, and a front view of the optical transmitting/receiving unit, respectively. , Fig. 8 is a circuit diagram of the optical transmitting/receiving unit, and Fig. 9 (A). Fig. 9 (A) is a side view of the shielding pipe, respectively, and a cross section along line IX B - IX B in the same figure (△). An arrow view, a front view, and FIG. 10 are diagrams showing a state in which the optical transmitting/receiving unit is fixed in the bif; FIGS. 11 (A> and (B) are respectively a front view and a plan view of the positioning member; Figure (Δ) is a front view of the ferrule, and Figure 12 (B) is the X in Figure 12 (A).
A cross-sectional view taken along the line ll3-XTIB, Fig. 13 (A
), (B) are respectively a perspective view and a sectional view of the fixing base, and FIG. 14 (
A) is a partial vertical cross-sectional view of the plug cover, FIG. 14(B) is a cross-sectional view taken along the line XrV-XrV in FIG. 14(A), and FIG. 15 is a perspective view of the locking member. FIG. 16 is a sectional view showing a part of a modified example of the optical grab, and FIG.
FIG. 2 is a diagram schematically showing a configuration in which optical plugs are attached to both ends of an optical fiber cable in correspondence with sockets to which each optical plug is connected. 1.100...optical plug, 2...socket, 3...
・Light emitting diode, 4... Photodiode ICl3・
...Printed circuit board assembly, 6...Contact pin for receiving data, 7...Contact pin for grounding, 8...
・Contact pin for transmission data, 9.10... Contact pin for power supply, 11... Gold R'lJ shielding vibe, 12... Dual fiber cable, 20... Support stand, 21... - Holding member, 22... Optical transmitting/receiving unit, 35a to 35c... Cut-and-raised piece, 37... Ferrule, 38... Holder. Figure 10□B

Claims (1)

[Claims] A light transmitting and/or receiving unit, which has a contact pin at one end of the printed circuit board assembly and a light emitting element and/or light receiving element at the other end, is placed inside a pipe having a protrusion for preventing the pipe from coming off at the tip end. a step of inserting from the rear end side, and press-fitting a ferrule holding the tip of the fiber of the fiber cable into the rear end side of the pipe into which the optical transmitting and/or receiving unit is inserted, and inserting the fiber cable through the pipe; A method for assembling an optical plug, comprising the steps of integrating the ferrule with the optical transmitting and/or receiving unit, and fitting and fixing a cylindrical holder around the pipe. .