JPH0282207A - Production of light emitting element connector - Google Patents

Abstract

PURPOSE:To enhance welding joint strength without increasing laser output and to decrease welding points by forming recesses to respective joint parts and irradiating the recesses with a laser, thereby welding the joint parts. CONSTITUTION:The V-shaped recesses 5 are formed to the peripheral part at the top end of a laser releasing end 11 and the peripheral part of the joint surfaces of the joint part 2a of the laser releasing end 11 and a lens holder 2. The joint part 2a of the lens holder 2 is thereafter superposed on the laser releasing end 11. The recesses 5 are thereafter formed similarly to the peripheral part of the respective joint parts. These recesses 5 are irradiated with the laser. Since the surface area of the joint part subjected to the irradiation of the layer is widened in this way, the joint strength is improved. The strength to torsion and bend in particular is increased.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to an improvement in the manufacturing method of a light emitting device connector, and in particular, to an improvement in a laser welding method used in the manufacturing process of a light emitting device connector, to increase the strength of the welded joint without increasing the laser output. As a result, it is possible to reduce the number of welding points, and furthermore, to provide a method for manufacturing a light emitting element connector in which the welding is carried out evenly at various points around the joint part, so that distortion does not occur in the welded parts. A method for manufacturing a light emitting element connector in which a light emitting end of a light emitting element, a lens holder, a core holder, and an optical fiber are welded together by laser welding, wherein an upper end of the light emitting end and the light emitting element are welded together. a periphery between the lower end of the joint between the emission end and the lens holder; a periphery between the upper end of the lens holder and the lower end of the joint between the lens holder and the core holder; A recess is formed in the upper end of the child holder and the peripheral part of the joint between the core holder and the optical fiber, and the recess is irradiated with a laser to form the light emitting end and the light emitting end. and a joint between the lens holder and the lens holder, a joint between the lens holder, the lens holder, and the core holder, and a joint between the core holder, the core holder, and the optical fiber by welding and connecting, respectively. It is composed of processes.

(Industrial Application Field) The present invention relates to an improvement in a method for manufacturing a light emitting device connector. In particular, the present invention relates to improvements in laser welding methods used in the manufacturing process of light emitting device connectors.

[Prior Art] A method of manufacturing a light emitting device connector according to a prior art will be described with reference to the drawings.

The reference figure in FIG. 3 shows the structure of a semiconductor laser connector as an example of a light emitting element connector, where 1 is a semiconductor laser as an example of a light emitting element, and 11 is an example of a light emitting end. 2 is a laser emitting end, and 2 is a lens holder;
3 is a core holder, and 4 is an optical fiber.

The laser emitting end 11, the lens holder 2, the core holder 3, and the optical fiber 4 are arranged so that the amount of laser beam emitted from the semiconductor laser 1 entering the optical fiber 4 via the laser emitting end 11 is maximized. After adjusting the relative positional relationship between the semiconductor laser 1 and the lens holder 2, the lens Multiple locations around the upper end of the holder 2 and the lower end of the joint 3a between the lens holder 2 and core holder 3, and the joint between the upper end of the core holder 3, the core holder 3, and the optical fiber 4. Welding is performed by irradiating a laser such as a YAG laser to a plurality of locations around the periphery. In order to increase the strength of welded joints, it is effective to increase the laser output or increase the number of welded parts.

[Problem to be solved by the invention]

By the way, when laser welding minute parts, if you try to increase the laser output to increase the weld joint strength, the minute parts to be welded will deform or melt, so there is a limit to increasing the laser output. There is. In addition, even if we try to increase the strength of welded joints by increasing the number of welding points, it is often impossible to increase the number of welding points because the jigs that fix the parts to be welded to each other for welding interfere with laser irradiation. Even if it were possible to increase the number of welded parts, it would have the disadvantage of increasing manufacturing man-hours and increasing the economic burden.Also, it is practically difficult to accurately irradiate the joining surface of two welded parts with the laser beam spot. The center of the beam spot often deviates from the welding surface in one direction or the other, resulting in an imbalance in the amount of melted workpiece at each welding point around the joint, causing the melted workpiece to cool down. An imbalance also occurs in the amount of shrinkage that inevitably occurs during solidification, causing distortion in the welded member.

The purpose of the present invention is to eliminate these drawbacks,
It is possible to increase the strength of the welded joint without increasing the laser power, and as a result, it is possible to reduce the number of welding points, and furthermore,
It is an object of the present invention to provide a method for manufacturing a light emitting element connector in which each part of the peripheral part of a joint part is uniformly welded so that distortion is not caused in a member to be welded.

[Means to solve the problem]

The above purpose is to create a light emitting element connector which is formed by laser welding the light emitting end (11) of the light emitting element (1), the lens holder (2), the core holder (3) and the optical fiber (4). In the manufacturing method, an upper end of the light emitting end (11), the light emitting end (11), and the lens holder (2)
The peripheral part of the lower end of the joint (2a) with the lens holder (2), the lower end of the joint (3a) between the upper end of the lens holder (2) and the lens holder (2) and the core holder (3) A recess (5) is formed in the peripheral part of the core holder (3) and the peripheral part of the upper end of the core holder (3) and the joint part of the core holder (3) and the optical fiber (4), (5) by irradiating a laser to the light emitting end (11) and the joint (2a) between the light emitting end (11) and the lens holder (2).
and the lens holder (2) and the lens holder (2).
and the step of welding and connecting the joint portion (3a) between the core holder (3), the core holder (3), the core holder (3), and the optical fiber (4), respectively. This is achieved by the existing method for manufacturing a light emitting device connector.

[Function] The figure shown in Fig. 2 shows the solidified state of the base metal after melting in the laser welded part, and the left half shows the result of welding by a conventional laser welding method that does not provide a recess around the joint part, The right half shows the result of welding by the laser welding method used in the method for manufacturing a light emitting device connector according to the present invention provided with a recessed portion.

In the method for manufacturing a light emitting device connector according to the present invention, a recess 5 is formed in the peripheral part of each joint, and the recess 5 is irradiated with laser, so compared to the conventional method in which no recess is formed, the laser The surface area of the joint exposed to irradiation is increased. As a result, even if the laser beam of the same output is irradiated, the area in which the base metal of the joint part melts increases, and the area of the welded joint formed by solidifying this increases, as shown in the right half of Figure 2. The bonding strength is increased compared to the conventional method shown in the left half of the figure, and the bonding strength is improved. In particular, the strength against twisting and bending is increased. In addition, since the laser melts and solidifies the parts to be welded within the recess formed around the joint, the melted and solidified metal does not protrude onto the surface of the parts to be welded. It is relatively easy to accurately align the laser beam spot with the recess 5 formed in the joint, so welding is done evenly at various points around the joint, and no distortion occurs in the welded parts. .

〔Example〕

Hereinafter, a method for manufacturing a laser connector as an example of a light emitting device connector according to an embodiment of the present invention will be described with reference to the drawings.

See Figures 1b and 1C. Figure 1b is a sectional view of the laser emitting end 11 and lens holder 2 stacked together via the joint 2a of the lens holder 2, and Figure 1C is a cross-sectional view of the laser emitting end 11 and the lens holder 2, which are stacked together via the joint 2a of the lens holder 2. FIG. 3 is a plan view of the end portion 11 viewed from the lens holder 2 side.

For example, four character-shaped recesses 5 as shown in the figure are formed in the periphery of the upper end of the laser emission end 11 and the periphery of the joint surface of the joint 2a between the laser emission end 11 and the lens holder 2. .

The number of single-shaped recesses 5 to be formed is selected depending on the size of this joint surface, etc. Thereafter, the joint portion 2a of the lens holder 2 is overlapped with the laser emission end portion 11. Similarly, a V-shaped recess 5 is formed in the periphery of the upper end of the lens holder 2 and the periphery of the joint surface of the joint 3a between the lens holder 2 and the core holder 3. The core holder 3 is overlapped with the core holder 3, and then a single-shaped recess 5 is formed in the periphery of the upper end of the core holder 3 and the periphery of the joint surface with the optical fiber 4, respectively. The peripheral part of the upper end of the optical fiber 4 is overlapped with the optical fiber 4.

The drawing referred to in FIG. 1a is an assembled view of the laser connector assembled through the above steps. 1 is a semiconductor laser, 11 is a laser emission end, 2 is a lens holder that holds a focusing lens, etc., 2a is a joint that joins the lens holder 2 to the laser emission end 11, and 3 is a It is a core holder, 3a is a joining part which joins the core holder 3 to the lens holder 2, and 4 is an optical fiber. The peripheral part of the laser emission end 11 and the peripheral part of the joint 2a of the lens holder 2, and the peripheral part of the lens holder 2 and the joint 3a of the core holder 3.
Recesses (not shown) similar to the recesses 5 shown in FIGS. 1b and 1c are formed in the periphery of the core holder 3 and the optical fiber 4, respectively. A voltage is applied to the semiconductor laser 1, and the laser emitting end 11 of the semiconductor laser 1, the lens holder 2, the core holder 3, and the optical fiber 4 are connected so that the amount of the generated laser beam incident on the optical fiber 4 is maximized. After aligning their relative positions, each of the recesses 5 is irradiated with a laser such as a YAG laser to weld the members together.

Refer to FIG. 1d. The shape of the recess 5 formed around each joint is as follows:
The shape is not limited to the V-shape described above, but may be a rectangular shape as shown in FIG. 1d, for example.

[Effects of the Invention] As explained above, in the method for manufacturing a light emitting element connector according to the present invention, light emission is achieved by laser welding the light emitting end of the light emitting element, the lens holder, the core holder, and the optical fiber. In the method for manufacturing an element connector, a peripheral portion between an upper end of the light emitting end and a lower end of a joint between the light emitting end and the lens holder, an upper end of the lens holder, the lens holder, and the A recess is formed in the periphery of the lower end of the joint with the core holder, the upper end of the core holder, and the periphery of the joint between the core holder and the optical fiber; irradiate the laser with a laser beam to remove the joint between the light emitting end, the light emitting end, and the lens holder, the joint between the lens holder, the lens holder, and the core holder, and the core holder. Since the core holder and the optical fiber are connected by welding, the welded joint area increases and the joint strength can be increased without increasing the laser output. As a result, it is possible to reduce the number of welding locations compared to the conventional method, thereby increasing economic benefits.

Additionally, since it is easy to precisely align the laser beam spot with this recess, it is possible to weld evenly at each location around the joint, which eliminates distortion in the welded parts after welding. There is no.

[Brief explanation of the drawing]

FIG. 1a is an assembled view of a laser connector according to an embodiment of the present invention. FIG. 1b is a sectional view showing a recess formed in the joint surface between the laser emitting end of the laser connector and the joint of the lens holder according to an embodiment of the present invention. FIG. 1c is a plan view showing a recess formed in a laser emitting end of a laser connector according to an embodiment of the present invention. FIG. 1d is a sectional view showing a modified example of a recess formed in the joint surface between the laser emitting end of the laser connector and the joint of the lens holder according to an embodiment of the present invention. FIG. 2 is a comparison diagram of the base metal weld penetration state of the laser welded part between the present invention and the prior art. FIG. 3 is an assembly diagram of a laser connector according to the prior art. l ・ ・ 11 ・ 2 ・ ・ 2a ・ 3 ・ ・ 3a ・ 4 ・ ・ 5 ・ ・ Light emitting element (semiconductor laser), laser emission end, lens holder, lens holder joint, core holder, core holder junction, optical fiber recess.

Claims (1)

[Claims] A light emitting element connector formed by laser welding a light emitting end (11) of a light emitting element (1), a lens holder (2), a core holder (3), and an optical fiber (4). In the manufacturing method, the upper end of the light emitting end (11) and the light emitting end (1
1) and the lower end of the joint (2a) of the lens holder (2), and the upper end of the lens holder (2), the lens holder (2), and the core holder (3). The periphery of the lower end of the joint (3a) and the core holder (
3) forming a recess (5) in the upper end and a peripheral part of the joint between the core holder (3) and the optical fiber (4), and irradiating the recess (5) with a laser; , the light emitting end (11), the joint (2a) between the light emitting end (11) and the lens holder (2), and the lens holder (
2), the lens holder (2), and the core holder (3)
A light emitting element comprising the step of welding and connecting a joint portion (3a) with a core holder (3), a core holder (3), and an optical fiber (4), respectively. How to manufacture the connector.