JPS623872A - Brazing alloy gushing type ultrasonic brazing device and brazing method for optical connector using said device - Google Patents

Abstract

PURPOSE:To improve the quality of brazing by ultrasonically oscillating a horn, gushing a molten brazing alloy in a pot from the top end of a nozzle and brazing the inside circumferential surface of a ferrule and optical fiber via the gushing nozzle. CONSTITUTION:The pot 7 is provided to a core 6 at the top end of the horn 5 connected to an ultrasonic oscillator 1 and the molten brazing alloy 10 is contained therein. The bottom end of the gushing nozzle 11 in which a gushing hole 12 is penetrated is imposed to the top end of the core 6. The horn 5 is ultrasonically oscillated to gush the molten brazing alloy 10 in the port 7 to the top end of the nozzle 11 and the bottom end of the ferrule 21 in which the optical fiber 25 is inserted is pressed to the top end of the nozzle 11 so as to contact therewith, by which the ferrule 21 and the optical fiber 25 are brazed. The brazing is made sure and the intrusion of impurities is decreased by the above-mentioned method. The quality of the brazing is thus improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a brazing alloy jet type ultrasonic brazing device for brazing, and a method of brazing optical connectors used in optical transmission and other fields using the device.

[Conventional technology]

Conventionally, an ultrasonic brazing method has been known for brazing that utilizes a minute gap between objects to be joined, in which the solder penetrates into the minute gap while applying ultrasonic vibrations to a molten brazing alloy. As disclosed in Japanese Patent Publication No. 59-129816, there is an apparatus and method in which the tip of an optical connector is inserted while applying ultrasonic vibrations to molten solder in a solder bath provided above ultrasonic vibrations.

[Problem that the invention seeks to solve]

However, with the above-mentioned conventional equipment, oxides are formed on the solder surface, the brazing workability is poor, and poor brazing occurs. Solder adheres to parts that do not require solder, causing problems when soldering precision machined parts.Furthermore, because the level of solder in the solder tank is not constant, the amount of unnecessary solder adhered to is also not constant, and uniform processing is not possible. There were problems such as not being able to do so.

[Means for solving problems]

The device of the present invention for solving the above problem includes a pot 7 containing a molten brazing alloy 10 on the outer periphery of a tip core 6 of a horn 5 connected to an ultrasonic vibrator 1 and subjected to axial ultrasonic vibration. A lower end of a jet nozzle 11, which has passed through a jet hole 12 through which the brazing alloy flows in an upward jet, is placed in contact with the tip of the tip core 6.
The brazing alloy 10 in the pot 7 is caused to enter between the contact surfaces of the jet nozzle 11 by the ultrasonic vibration, and the jet nozzle 1 is placed in the pot 7 so that the jet nozzle 1 can be vertically vibrated at a fixed position on the tip core 6. It is characterized in that a nozzle guide 9 is provided to support the nozzle.

In addition, a method for brazing an optical connector using the above-mentioned device involves applying ultrasonic vibration to the horn 5, causing the molten brazing alloy 10 in the pot 7 to be jetted to the upper end of the jet nozzle 11, and to cause the inside to flow into the upper end of the jet nozzle 11. 7 through which the optical fiber 25 is inserted
It is characterized in that the lower end surface of the ferrule 21 is pressed and a molten brazing alloy is injected between the inner circumferential surface of the ferrule 21 and the optical fiber 25 to braze them together.

[Effect]

The horn 5 is given ultrasonic vibration in the axial (vertical) direction by an ultrasonic vibrator. It enters between the contact surfaces at the lower end and is ejected through the jet hole 2 to the upper end of the jet nozzle 11.

This jet melted brazing alloy is always fresh without any mixed impurities, and when a flat surface of glass coated with a coating or an end face of an optical connector is pressed onto it, the brazing alloy adheres to the glass surface or the optical connector It penetrates into the minute gap between the joints at the ends and brazes them together.

Further, the nozzle guide 9 holds the jet nozzle 11 so as to be able to move up and down so that the jet nozzle 11 always maintains the correct position and is placed in contact with the tip core 6, and also allows the jet nozzle 11 to move upward and downward. Does not obstruct the flow of brazing alloy.

When the above-mentioned brazed joint is an optical connector, the molten brazing alloy at the upper end of the jet nozzle 11 is in contact only with the end face of the ferrule 21, and is inserted into the inner periphery of the microhole 26 that opens in the end face. It ascends into the minute gap between it and the optical fiber 25, and brazes and fixes both.

〔Example〕

(1) Apparatus of the present invention Figures 1 and 2 are an enlarged sectional view of the main part of the apparatus of the present invention and a partial view including the ultrasonic transducer part. A lower horn 3 is connected to the upper end via a heat insulating collar 2, and an upper horn 5 is sequentially and concentrically connected to the upper end via a heat insulating collar 4.

A pot 7 with a heating device is attached around the tip core 6 of the upper horn 5 to accommodate a melted brazing alloy such as solder, and the tip core 6 has a structure in the center of the cylindrical bot 7 that protrudes from the bottom. be. A nozzle guide 9 with a nozzle insertion hole 8 in the center is provided on the inner surface of the bot peripheral wall at a position slightly higher than the upper end of the tip core 6, and is provided with a number of holes penetrating vertically. A brazing alloy flow path 9a consisting of a hole is bored, and the structure is such that the molten brazing alloy 10 housed in the pot 7 can flow vertically. A jet nozzle 11 made of a heat-resistant metal or the like and having an upper portion protruding from the surface of the brazing alloy 10 is mounted on the upper end of the tip core 6 and is fitted into the insertion hole 8 of the nozzle guide 9 so as to be movable up and down. In the center of this jet nozzle 2, a jet hole 2 with a diameter of, for example, about 1 mm is provided vertically and vertically, and the contact surface between the lower end of the jet nozzle 11 and the upper end of the tip core 6 is As shown in Figures (A) to (C), in order to be in close contact with each other, they have a flat, spherical, or mortar-like uneven surface.

Further, the upper end of the jet nozzle 11 also has a certain amount of jet brazing alloy 10.
A concave portion 13, such as a mortar-shaped concave portion, is formed to collect water and accommodate the protruding end of the optical fiber, and a jet hole 12 is opened at the center of the concave portion 13.

(2) Brazing method using a brazing device To perform brazing using the above-described device, first, the molten brazing alloy 10 is placed in the pot 7 so that its upper surface is above the nozzle guide 9, and Nozzle 1] is fitted into the nozzle insertion hole 8 and placed on the tip core 6, and the ultrasonic transducer 1
For example, a vertical ultrasonic vibration of about 10 KI (Z ~ 100 MHz) is generated. By this operation, the molten brazing alloy 10 in the lower part of the bot 7 enters between the contact surface between the nozzle 11 and the upper surface of the tip core 6. The solder alloy is ejected through the jet hole 12 into the concave portion 13 at the upper end of the nozzle, and when a glass surface coated with a conductive film such as Nesa coating is pressed onto the ejected raised brazing alloy, a point solder for the terminal solder elbow is formed on the glass surface. An attachment will be given.

Furthermore, when the end face of a cylindrical object to be welded that is fitted with a minute gap is pressed against the raised jetted solder alloy, the jetted solder alloy rises and enters the minute gap from below due to the action of ultrasonic vibration. It adheres to the fitting surfaces of the objects to be joined that form a minute gap, and firmly fixes the objects to be joined together.

(3) Optical Connector Brazing Method Next, the optical connector brazing method using the above-mentioned apparatus and brazing method will be explained.

A coated fiber wire 23 is inserted and held from the rear through the center of the ferrule 2, and a bushing 24 of a certain length made of ceramics or the like and forming the center of the end of the ferrule 21 is fixed and fixed at the tip. inserted concentrically. A minute hole 26 with a diameter of about 125 μm passes through the center of the bushing 24 with a tolerance of about 1 μm and an optical fiber 25 that protrudes from the coated fiber wire 23 is inserted. It protrudes slightly from the surface. Note that some ferrules 21 are not provided with the bushing 24 as described above.

Ferrule 21 and bushing 2 of the optical connector shown in Fig. 1
4. Preheat the optical fiber 25 to a certain level, hold it downward with the lip-shaped heat insulating chuck 20, lower it onto the jet nozzle 11, and press it, and pour the molten brazing alloy 10 from the upper end of the jet nozzle 11. When jetted, molten brazing alloy 1
0, the optical fiber 25 and the microhole 26 are created by ultrasonic vibration.
The optical fiber 25 and the ferrule 21 are integrally brazed together by entering the minute gap between them (the fitting tolerance between the two) and rising within a certain period of time.

FIG. 4 is a cross-sectional view of another device according to the invention. In this device, the outer diameter d' of the jet nozzle is smaller than the outer diameter d of the retractable sleeve 22. This is particularly preferable since the outer circumferential surface of the insertion sleeve 22 is extremely unlikely to be contaminated by adhesion of the solder alloy (and the soldering process is simplified. On the other hand, the outer diameter d' of the jet nozzle 11 is If it becomes too small, the transmission efficiency of ultrasonic vibration will decrease, and furthermore, it will become difficult to align the insertion sleeve and the jet nozzle, reducing work efficiency. Therefore, the outer diameter d' of the jet nozzle should be at least 1 mm. is desirable.

Further, it is preferable that the inner diameter of the jet hole 12 of the jet nozzle is larger than the outer diameter of the fiber, since this reduces the possibility that the fiber protruding from the lower end surface of the insertion sleeve will come into contact with the nozzle and be damaged. In particular, it is preferable to set the inner diameter of the jet hole to 0.5 days or more, since it is possible to prevent the jet hole from becoming clogged by impurities such as oxides.

The brazing method using such an apparatus can be carried out in the same manner as that using the apparatus shown in FIG. 1 above.

〔Effect of the invention〕

As a result of the present invention being configured as described above, the present invention has the following specific effects.

(1) The molten solder alloy can be jetted by vibration while maintaining the wax content locally due to ultrasonic vibration, and there is no need for a special mechanism for jetting as in the past. For example, point welding to a glass surface or the like can be easily and accurately performed.

(2) The molten brazing alloy is subjected to ultrasonic vibration (for example, 10 K
When the frequency is increased by I (Z ~ 100MHz), sufficient ultrasonic vibration is transmitted even at the molten brazing alloy spout (sufficient cavitation is confirmed), and the characteristics of conventional ultrasonic brazing remain unchanged. It is maintained.

(3) By adjusting the amplitude and frequency of the ultrasonic vibrations, the ejection amount of any brazing alloy can be kept constant.
It is possible to always braze a certain structure with a certain quality.
In particular, since the injection brazing alloy is always fresh, high-quality brazing can be achieved with less contamination by impurities and oxides.

(a) Since jet flow and vibration transmission are performed in the same part, the structure of the device is simple and maintenance is easy.

(5) Brazing alloy can be penetrated deep into tubular structures such as optical connectors, making it possible to sufficiently braze over a wide area, as well as attaching brazing alloy only to the end surfaces. Since it is possible to prevent attachment of the ferrule, for example, to the outer peripheral surface of the insertion sleeve, there is no need for defective products or repairs at the brazed portion.

(6) There is no or constant depth of the molten brazing alloy, so there are no brazing problems due to depth fluctuations. (7) If the outer diameter of the nozzle is smaller than the outer diameter of the inserted sleeve,
This is particularly advantageous since the risk of contamination of the outer circumferential surface of the plug-in sleeve with the solder alloy is extremely reduced.

[Brief explanation of the drawing]

Figures 1 and 2 are partially enlarged sectional views of the wax part of the device of the present invention, Figure 2 is a partial sectional view of the entire main part, and Figures 3 (A) to (C) are the wax part nozzle. FIG. 4 is a cross-sectional view of another device according to the invention; FIG. 1... Ultrasonic vibrator 1.4... Heat insulation collar 3.5
... Horn 6 ... Tip core 7 ... Bot 8 ... Nozzle insertion hole 9 ... Nozzle guide 9a ... Flow path 10 ... Brazing alloy 1
1... Jet nozzle 12... Jet hole 13...
- Concave portion 20...Insulation channel hole 21...Ferrule 22...Insertion sleeve 23...Coated fiber wire 24...Bushing 25...Optical fiber 26
...Minor hole Figure 1 Figure 2 Figure 3

Claims (4)

[Claims] (1) A pot containing a molten brazing alloy is provided on the outer periphery of the tip core of a horn that is connected to an ultrasonic vibrator to apply ultrasonic vibration in the axial direction, and the tip of the tip core has a pot containing the brazing alloy inside. The mechanism is such that the lower end of a jet nozzle that passes through a jet hole through which an upward jet is made is placed in contact with the lower end of the jet nozzle, and the brazing alloy in the pot is caused to enter between the contact surface of the tip core and the jet nozzle by the ultrasonic vibration, A brazing alloy jet type ultrasonic brazing device comprising a nozzle guide provided in the pot to support the jet nozzle so as to be able to move up and down at a fixed position on the tip core. (2) The braze alloy jet type ultrasonic brazing apparatus according to claim 1, wherein a recess for temporarily storing a certain amount of molten braze alloy is formed at the upper end of the jet nozzle. (3) A pot containing the molten brazing alloy is provided on the outer periphery of the tip core of the horn, which is connected to an ultrasonic vibrator to apply ultrasonic vibration in the axial direction, and the tip of the tip core has a pot containing the brazing alloy inside. The mechanism is such that the lower end of a jet nozzle that passes through a jet hole through which an upward jet is made is placed in contact with the lower end of the jet nozzle, and the brazing alloy in the pot is caused to enter between the contact surface of the tip core and the jet nozzle by the ultrasonic vibration, Ultrasonic vibrations are applied to the horn of a brazing alloy jet type ultrasonic brazing device, which is equipped with a nozzle guide that supports the jet nozzle in the pot so as to be able to move up and down at a fixed position on the tip core, and melt the wax in the pot. The alloy is jetted to the upper end of the jet nozzle, and the lower end surface of the ferrule, into which the optical fiber is inserted, is pressed against the upper end of the jet nozzle, so that the molten brazing alloy enters between the inner peripheral surface of the ferrule and the optical fiber. Optical connector brazing method that involves brazing the two together. (4) The brazing method according to claim 3, wherein the outer diameter of the jet nozzle is smaller than the outer diameter of the lower end surface of the ferrule.