JPH0834453B2 - Alignment method for optical transmission equipment - Google Patents

Description

Description: [Object of the Invention] (Field of Industrial Application) The present invention relates to an alignment method of an optical transmission device for optically coupling a photoelectric conversion element such as a light emitting element or a light receiving element and an optical fiber.

(Prior Art) As an optical transmission device for optically coupling a photoelectric conversion element such as a light emitting element or a light receiving element with an optical fiber, Japanese Patent Laid-Open No.
The structure described in Japanese Patent No. 39079 or Japanese Utility Model Publication No. 60-32648 is known.

That is, in such an optical transmission device, as for the structure for fixing the photoelectric conversion element to the receptacle provided with the element fixing portion and the optical connector coupling portion, conventionally, as shown in FIG. 4, a light emitting element or a light receiving element is conventionally used. The ultraviolet curable adhesive 3 is applied to the outer peripheral portion of the holder 2 accommodating a certain photoelectric conversion element 1, and the holder 2 is inserted into the element fixing portion 5 of the receptacle 4, and then the optical connector coupling portion 6 of the receptacle 4 is inserted. An optical connector holding an optical fiber (not shown) is connected to the photoelectric conversion element 1, and when the photoelectric conversion element 1 is a light emitting element, a predetermined test current is applied. While giving the output light or the output current, the photoelectric conversion element 1 is moved in the receptacle 4 along the optical axis direction to determine the maximum output position, End to be irradiated with ultraviolet rays to cure the ultraviolet-curable adhesive 3 to secure the photoelectric conversion element 1 relative to the receptacle 4.

However, the alignment direction of the photoelectric conversion element 1 inside the receptacle 4 can be performed only in the optical axis direction, and the optical axis deviation cannot be corrected.

Further, as shown in FIG. 5, the photoelectric conversion element 1 is fitted into the high precision guide sleeve 7 and inserted into the element fixing portion 5 of the receptacle 4, and the optical connector coupling portion 6 of the receptacle 4 is aligned without alignment. Is optically coupled to the optical fiber 9 of the optical connector 8 coupled to.

However, in order to fix the photoelectric conversion element 1 to the receptacle 4 without alignment, the concentricity between the hole of the optical connector coupling portion 6 of the receptacle 4 and the hole of the element fixing portion 5 and the dimensional accuracy of the guide sleeve 7 are high. Since precision is required, the cost of parts is high and it is not suitable for mass production. Further, the mechanical accuracy alone is not suitable for a photoelectric conversion element such as a laser diode or a light emitting diode which requires higher optical axis accuracy.

(Problems to be Solved by the Invention) As described above, in the conventional optical transmission device, it is difficult to align the optical axis shift between the photoelectric conversion element and the optical fiber, or mechanical adjustment such as a guide sleeve or a receptacle is required. Depending on the alignment of accuracy, it is not possible to deal with cost and productivity and photoelectric conversion elements that require high optical axis accuracy.

The present invention has been made in view of the above problems, and it is possible to easily align the photoelectric conversion element to an appropriate alignment position of the receptacle, and also to correspond to a photoelectric conversion element that requires cost and productivity and high optical axis accuracy. An object of the present invention is to provide a method of aligning an optical transmission device that can be performed.

[Structure of Invention]

(Means for Solving Problems) The present invention provides an optical transmission including a photoelectric conversion unit having a photoelectric conversion element, and a receptacle having a photoelectric conversion unit fixing portion for fixing the photoelectric conversion unit and an optical connector coupling portion. In the aligning method of the device, the photoelectric conversion unit is movable in the optical axis direction of the light which holds the photoelectric conversion element and is transmitted in the photoelectric conversion unit fixing portion and a direction intersecting the optical axis during the alignment. A holder to be inserted into the photoelectric conversion unit, and a single aligning body that is detachably protruded from the holder and that adjusts the position of the holder. By manipulating the aligning body, the holder inserted in the photoelectric conversion unit fixing part is moved in the optical axis direction of the transmitted light and in the direction intersecting with this optical axis to perform photoelectric conversion. The position of the replacement element is set, the holder is fixed at the set position, and the aligning body is removed while the holder is fixed.

(Operation) In the alignment method of the optical transmission device of the present invention, the holder is inserted into the photoelectric conversion unit, and one alignment body is operated from the outside to transmit the light transmitted through the holder inserted into the photoelectric conversion unit fixing portion. Set the position of the photoelectric conversion element by moving in the direction of the optical axis and the direction crossing the optical axis, fix the holder at this set position, remove the aligning body with this holder fixed, and Align the holder in any direction with the configuration.

(Embodiment) Hereinafter, the configuration of an embodiment of the present invention will be described with reference to FIG. 1 and FIG.

11 is a synthetic resin receptacle.
A photoelectric conversion unit fixing portion 12 is formed inside the photoelectric conversion unit fixing portion 12.
Is formed of a rectangular storage space 13 opening to the lower surface of the storage space 13. The storage space 13 is formed with fitting grooves 14 on both inner wall surfaces and upper inner wall surfaces facing the side surfaces in the direction of the optical connector coupling portion 19. At the same time, a back plate mounting step 15 is formed on the lower edge of the storage space 13. Then, a spacer 17 having a through hole in the center is inserted and arranged in the fitting groove 14 of the storage space 13, and the back plate mounting step portion 15 increases the fixing force at the time of mounting on the board. A metallic reinforcing pin 18 for the purpose of projecting below the receptacle 11.

Further, an optical connector coupling portion 19 is integrally formed on one side portion of the receptacle 11, and the optical connector coupling portion 19 has a ferrule fitting hole 20 that is open to communicate with the storage space 13 of the photoelectric conversion unit fixing portion 12. The ferrule holding tubular portion 21 having the connector is provided in a projecting manner, and the ferrule holding tubular portion 21 is surrounded and a threaded portion 22 is formed on the outer periphery thereof to form a connector coupling tubular portion 23.
Is protruding.

Further, 31 is a photoelectric conversion unit, this photoelectric conversion unit 31 has a holder 32, this holder 32 is molded in a rectangular shape by synthetic resin, the optical axis direction when inserted into the storage space 13 of the receptacle 11 The outer dimensions are set to have a movable margin of about 0.2 to 1 mm in the horizontal and vertical directions orthogonal to the optical axis. Also this holder
An element housing recess 33 is formed on the outer surface facing the optical connector coupling portion 19 of the member 32, and a pair of lead wire holes 34 is formed to connect the inner part of the element housing recess 33 and the lower surface of the holder 32. The photoelectric conversion element 36 of the light emitting element or the light receiving element enclosed in the metal cap 35 is accommodated in the element accommodating recess 33, and is fixed by the adhesive 37,
Photoelectric conversion element 36 derived from the back surface of the metal cap 35
A pair of lead wires 38 of the holder 32 through the lead wire hole 34.
Is pulled out to the underside of.

In addition, a bar-shaped aligning body 39 is formed from substantially the center of the lower surface of the holder 32.
Are integrally projected, and the aligning body 39 is cut and removed at the cutting portion 40 at the joint portion with the holder 32 after the aligning operation.

Further, the optical connector coupled to the optical connector coupling portion 19 of the receptacle 11 has a ferrule 42 that is inserted into the ferrule fitting hole 20 fixed to the end of the optical fiber 41, and the screw of the connector coupling cylindrical portion 23. It has a screw ring (not shown) that is screwed to the portion 22.

Then, when fixing the photoelectric conversion unit 31 to the receptacle 11, the spacer 17 is inserted into the fitting groove 14 of the storage space 13 of the receptacle 11. Also, the receptacle 11
The optical connector of the optical fiber 41 is coupled to the optical connector coupling section 19 of and the ferrule 42 is inserted into the ferrule fitting hole 20. The ferrule 42 is positioned and held in the ferrule fitting hole 20 in a direction orthogonal to the optical axis, and is positioned and held in the optical axis direction by the end face of the ferrule 42 abutting the spacer 17.

Then, the aligning body 39 of the photoelectric conversion unit 31 is mounted on the aligning jig, and the holder 32 supported by this aligning body 39 is inserted into the storage space 13 of the receptacle 11. In this inserted state, when the photoelectric conversion element 36 is a light emitting element, a predetermined test current is applied to the photoelectric conversion element 36 through the lead wire 38,
Storage space via the aligning body 39 while monitoring the output light to 41
The holder 32 in 13 is moved to find the alignment position where the output light reaches the maximum value. On the other hand, when the photoelectric conversion element 36 is a light receiving element, a predetermined test light is given from the optical fiber 41, the holder 32 in the storage space 13 is moved through the aligning body 39 while monitoring the output current, and output. Find the alignment position where the current reaches its maximum value.

After the alignment position of the photoelectric conversion element 36 is taken out, the adhesive 45 is injected and fixed between the inner wall of the storage space 13 and the holder 32,
Further, after this fixing, the aligning body 39 is cut and removed from the cutting portion 40, a back plate (not shown) is fixed to the back plate mounting step portion 15 by adhesion or welding, and the opening of the storage space 13 is closed. . Then, the reinforcing pin 18 and the lead wire 38 are pulled out through the back plate.

Further, as shown in FIG. 3, the lead wire 38 of the photoelectric conversion element 36 is
Is parallel to the optical axis direction and the opening of the storage space 13 is on the side opposite to the optical connector coupling section 19 of the receptacle 11, the aligning body 39 is placed in the photoelectric conversion element 36 of the holder 32.
The photoelectric conversion element 36 can be aligned as described above by being provided on the side surface opposite to the side surface. In this case, the reinforcing pin 18
Also projects in the opening direction of the storage space 13.

In the above embodiment, the photoelectric conversion element 36 is shown enclosed in the metal cap 35.
Some are attached to the lead frame.

Further, the holder 32 of the photoelectric conversion unit 31 may be formed of a metal having a high thermal conductivity, and in this case, it is possible to effectively dissipate the heat of the light emitting element which generates heat particularly by converting electricity into light. The fluctuation of the optical output can be reduced.

Further, the aligning body 39 is not limited to the rod shape as in the above embodiment, and may have any shape as long as it can hold the aligning jig, and the aligning body 39 formed separately from the holder 32. May be integrally and removably coupled to the holder 32 by adhesion and welding, or by fitting coupling.

〔The invention's effect〕

According to the present invention, the holder is inserted into the photoelectric conversion unit, and one aligning body is operated from the outside to intersect the optical axis of the light transmitted through the holder inserted in the photoelectric conversion unit fixing portion and the optical axis. Direction to set the position of the photoelectric conversion element, fix the holder at this set position,
While the holder is fixed, the aligning body can be removed, and the holder can be easily aligned to the appropriate aligning position in any direction with a simple structure. It can also be applied to photoelectric conversion elements that require precision.

[Brief description of drawings]

1 is a sectional view showing an embodiment of an optical fiber aligning method of the present invention, FIG. 2 is a bottom view thereof, FIG. 3 is a sectional view showing another embodiment of the present invention, and FIG. 5 and 6 are sectional views of a conventional optical transmission device. 11 …… Receptacle, 12 …… Photoelectric conversion unit fixed part,
19 …… Optical connector coupling part, 31 …… Photoelectric conversion unit, 32
…… Holder, 36 …… Photoelectric conversion element, 39 …… Alignment body.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masataka Axobuchi 72 Horikawa-cho, Sachi-ku, Kawasaki-shi, Kanagawa Toshiba Electronic Device Engineering Co., Ltd. (56) Reference JP-A-61-96424 (JP, A)

Claims (3)

[Claims] 1. A method for aligning an optical transmission device, comprising: a photoelectric conversion unit having a photoelectric conversion element; and a receptacle having a photoelectric conversion unit fixing portion for fixing the photoelectric conversion unit and an optical connector coupling portion. The conversion unit holds the photoelectric conversion element at the time of alignment, and a holder that is inserted movably in the optical axis direction of light transmitted in the photoelectric conversion unit fixing section and in a direction intersecting the optical axis, and this holder. And one aligning body which is provided so as to be removably projected to adjust the position of the holder, and the holder is inserted into the photoelectric conversion unit, and the one aligning body is operated to operate the photoelectric alignment unit. The position of the photoelectric conversion element is set by moving the holder inserted in the conversion unit fixing part in the optical axis direction of the transmitted light and in the direction crossing this optical axis. The method for aligning an optical transmission device, comprising: fixing the holder at a position set by, and removing the aligning body with the holder fixed. 2. The method for aligning an optical transmission device according to claim 1, wherein the holder of the photoelectric conversion unit is made of synthetic resin. 3. The method of aligning an optical transmission device according to claim 1, wherein the holder of the photoelectric conversion unit is made of metal having high thermal conductivity.