JPH0342154B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is particularly applicable to a device having a positioning function for a member to be welded such as a laser diode, a light emitting diode, a phototransistor, or a device combining these with an optical fiber. This invention relates to welding equipment.

[Conventional technology]

Generally, in the manufacturing process of optical devices such as laser diodes, the cap side and stem side are resistance welded, but since the optical axis alignment has a significant impact on the function of the optical device, extremely high precision is required. Optical axis alignment is required.

Conventionally, such a device uses a fine positioning device that can move with extremely high precision in the X- and Y-axis directions, supports the upper electrode chip of the resistance welding machine, and irradiates the upper electrode chip with light. The cap of the device was attached and the stem attached to the lower electrode chip was finely adjusted in the X and Y axis directions for alignment.

Conventional fine positioning devices like this are
Ball bearings or cross roller bearings are used for the movable part in the Y-axis direction, which causes the following drawbacks.

[Problem that the invention seeks to solve]

First, because the movable range of the fine positioning device in the X and Y axis directions is very small, for example, 1 mm or less, only a specific part of the linear drive ball bearing or the ball or roller of the cross roller bearing used for the movable part is Since the ball or roller rolls only on a specific part of the rolling groove and a preload force is applied to the bearing itself to improve accuracy, the ball or roller and that part of the rolling groove are deformed. This deformation causes uneven rolling motion of the bearing, making it extremely difficult to precisely align the members to be welded.

A second drawback is that bearings with high hardness and precision are usually made of iron or a magnetic material mainly composed of iron, so when a large welding current flows during resistance welding, the magnetic force causes the bearing to There is a fact that suction force and repulsion force act on the parts, and even if extremely accurate positioning is performed, the fine positioning device moves slightly, resulting in poor positioning accuracy.

In order to solve these problems, if the sliding part is made into a surface contact sliding surface, if the sliding surfaces are brought into close contact with each other in order to increase the accuracy, the frictional resistance will increase and the accuracy will decrease. Accurate alignment becomes extremely difficult, and if the sliding surfaces are brought into relatively rough contact in order to reduce frictional resistance, play will occur, making highly accurate alignment impossible.

[Means for solving problems]

According to the present invention, a first plate-like elastic body has a fixed end and a free end, and the free end side can be shifted by the first fine adjustment device, and the first plate-like elastic body is fixed to the first plate-like elastic body. a second plate-shaped elastic body having a fixed end and a free end, the free end being biased by the second fine adjustment device; and one of the pair of electrodes is connected to the second plate. It is characterized by being supported by a shaped elastic body.

[Effect]

The free end of the first plate-shaped elastic body is biased in a certain direction, for example, in the While moving the second plate-shaped elastic body fixed to the elastic body in the X-axis direction, the free end of the second plate-shaped elastic body is moved in a direction perpendicular to the certain direction, for example, in the Y-axis direction. By biasing the
The position of the member to be welded that is attached to one of the welding electrodes supported by the second plate-like elastic body is adjusted to achieve highly accurate positioning.

〔Example〕

An embodiment of a welding device according to the present invention will be explained with reference to FIGS. 1A, B, and C.

This embodiment is a welding machine that performs resistance welding after positioning a cap part a and a stem part b of an optical device such as a laser diode as a member to be welded with very high precision.

The alignment device 2 that supports the upper welding electrode 1 and the upper auxiliary electrode 1' includes a fixed end plate 2a fixed to a part of the holder 3 movable in the Z-axis direction via a flange 4, and one end of which is fixed to a part of the holder 3 movable in the Z-axis direction. A pair of identical elastic plates 2b, 2c fixed and arranged parallel to each other; a free end plate 2 fixed between their free ends to keep the elastic plates parallel;
d, an elastic plate 2 is attached to the attachment part 2d' of this free side end plate 2d.
Fixed side end plate 2f fixed via e, elastic plate 2
An elastic plate 2g placed parallel to e and equivalent to it,
a free side end plate 2h having an inverted L-shaped cross section, fixed between the free ends of the elastic plates 2e and 2g, and configured to support the upper welding electrode 1 and the upper auxiliary electrode 1';
and first and second fine adjustment devices 2i and 2j.

An electrode chip 1a detachably attached to the lower end of the upper welding electrode 1 is attached to the cap part a of the optical device.
The upper welding electrode 1 has a cavity in which the upper welding electrode 1 can be attached, and the cavity communicates with the cavity of the upper welding electrode 1. The cap part a fixed in the cavity is located at a position opposite to the conversion element 5 provided in the upper welding electrode 1. This conversion element 5
When the object to be welded is a light emitting element, it is a light-to-electric conversion element, and when the object to be welded is a light-receiving element, it is an electric-to-light conversion element. The lead terminals of the conversion element 5 are conductors 6 and 7.
is led out to the outside and connected to the automatic control circuit 8.

On the other hand, the stem portion b is fixed to a lower welding electrode 10 by a fixing member 9, and the lower welding electrode is supported by a base 11. Lead terminals b1 and b2 of the stem portion b are selectively connected to a DC power source 16 via a switch 15 and lead wires 13 and 14 connected to the terminals of a connector 12.

Positioning device 2 for welding equipment configured in this way
, a fixed side end plate 2a and a pair of elastic plates 2b,
2c and the free end plate 2d constitute a plate-like elastic body that moves the welded member a in the X-axis direction, and the other fixed end plate 2f, the other pair of elastic plates 2e and 2g, and the other free The side end plate 2h constitutes another plate-like elastic body that moves the member to be welded a in the Y-axis direction. The plate-like elastic body having such a structure is extremely resistant to torsion and is deflected only in the X-axis direction or Y-axis direction, which is also one of the reasons why highly accurate alignment is possible.

Now, the knob 2i ₁ of the fine adjustment device 2i in the X-axis direction
When turned, the shaft rod 2i ₂ moves to the right in the drawing, applies a pressing force in the X-axis deflection direction to the free end side of the elastic body 2c, and slightly shifts the free ends of the elastic plates 2c and 2b in the X-axis deflection direction. Shift by distance Δx. Along with this, the free side end plate 2d also moves by Δx in the X-axis deflection direction, so that the free side end plate 2d is fixed to the attachment part 2d' of the free side end plate 2d.
The plate-like elastic body for deflecting in the Y-axis direction consisting of members 2e to 2h also moves in the direction of deflecting the X-axis by Δx. Next, when the knob 2j ₁ of the fine adjustment device 2j in the Y-axis direction is turned, the shaft 2j ₂ advances in the Y-axis deflection direction and applies a pressing force in the Y-axis deflection direction to the free end sides of the elastic plates 2e and 2g. Then, the free ends of the elastic plates 2e and 2g are deflected by a minute distance Δy in the Y-axis deflection direction. Along with this, the fixed side end plate 2h also moves by Δy in the Y-axis deflection direction, so the upper welding electrode 1 and upper auxiliary electrode 1' attached to the free side end plate 2h end up moving by Δx, in the X and Y-axis deflection directions. Each moves by Δy. Therefore, the cap portion a attached to the electrode tip 1' of the upper welding electrode 1
also moves by Δx and Δy. Strictly speaking, when the free ends of each elastic plate are deflected by Δx and Δy, they are also deflected by extremely small distances in the Y- and X-axis deflection directions, but in actual alignment, both Since positioning is performed while simultaneously operating the fine adjustment devices 2i and 2j to compensate for extremely minute deviations, this does not pose a problem at all.

Next, the operation of the welding apparatus when actually resistance welding the stem portion and the cap portion of a laser diode will be explained. First, while the holder 3 is stopped at the upper limit position, the stem part b of the laser diode is set on the lower welding electrode 10 and fixed in a predetermined position with the fixing member 9. In this state, the lead terminal implanted below the stem portion b is engaged with the terminal of the connector. Further, the cap part a of the laser diode is engaged with the engagement hole of the electrode chip 1a, and is fixed so that it does not move.

Thereafter, the holder 3 is lowered by operating an elevating drive device (not shown), and is stopped at a position where a pressing force such that the stem portion b and the cap portion a are lightly abutted is applied. This pressing force is large enough to allow the stem portion b and the cap portion a to move while relatively abutting each other without causing stress during optical axis alignment to be performed later.

After that, the switch 15 is closed. When the switch 15 is closed, the optical semiconductor element mounted on the stem part b is energized by DC power from the DC power supply 16 and emits light. This light is input to the conversion element 5 through the light transmission part of the cap part a, and the conversion element 5 outputs electrical energy proportional to the input light energy. The automatic control circuit 8 controls both fine adjustment devices 2i and 2j so that this electrical energy is maximized.
is driven, and the drive is stopped when the electric energy reaches near the maximum. Thereafter, a predetermined pressure is applied, and while maintaining this state, welding current is passed between the upper and lower welding electrodes 1 and 10 to complete welding.

Next, another embodiment of the positioning device portion of the present invention will be described with reference to FIGS. 2A, B, and C. In the figure, B is a diagram showing a cross section taken along line A-A' in Figure A, and C is a diagram showing a cross section taken along line B-B' in Figure A.

In this embodiment, a fixed end plate 2a extends horizontally, and elastic plates 2b and 2c extend vertically downward from both sides thereof. A free end plate 2d is fixed to the free ends of the elastic end plates 2d, 2c. This free end plate 2d is also used as a fixed side end plate of the plate-shaped elastic body for Y-axis deflection, and as shown in FIG. A free end plate 2h is fixed to the free end. Here, the elastic plates 2d and 2c, and 2e and 2g have the same characteristics and are parallel to each other, as in the previous embodiment. Furthermore, the fixed end plate 2a has a hole with a diameter larger than the maximum movement range of the upper auxiliary electrode 1', and the end plate 2d also has a hole larger than the diameter of the maximum movement range of the upper welding electrode 1. In this embodiment, the fine adjustment devices 2i and 2j are attached to the respective mounting members I and J.
It is attached to the elastic plates 2c and 2e by
By turning the knobs, the pressing force applied to the elastic plates 2c and 2e can be adjusted. If the embodiment shown in FIG. 1 is a horizontal type, this embodiment is of a vertical type, and the free end plate 2d of the plate-shaped elastic body for deflection in the X-axis direction is replaced by a plate-shaped elastic body for deflection in the Y-axis direction. It has the advantage that it can also be used as the fixed side end plate of the body.

Next, another embodiment shown in FIG.
Members 2e to 2h are connected through a rectangular parallelepiped connecting plate 2k at right angles to the plate-like elastic body for deflection in the X-axis direction consisting of 2d.
This is a combination of plate-shaped elastic bodies for deflection in the Y-axis direction. Although the structure of this embodiment is relatively simple, consideration must be given to the strength capable of supporting the upper welding electrode 1 and the like. Furthermore, in each of the above embodiments, each plate-shaped elastic body may be a single appropriately selected plate spring. In this case, the pressing force applied to each plate-like elastic body is in the X-axis direction,
It is particularly preferable that the component be only in the Y-axis direction.

In each of the above embodiments, the upper welding electrode was moved slightly, but the lower welding electrode may be moved slightly in the same manner. Further, a plate-shaped elastic body that biases one welding electrode in the Z-axis direction may be combined.

〔Effect of the invention〕

As described above, according to the present invention, the electrode supported by the plate-like elastic body can be finely adjusted with extremely high precision by using the bias of the plate-like elastic body without using the sliding or rolling characteristics. The members to be welded attached to the electrodes can be aligned with extremely high precision. Furthermore, alignment performed with extremely high precision is not adversely affected by the welding current.

[Brief explanation of drawings]

FIGS. 1A, B, and C are views for explaining one embodiment of the present invention, in which A is a perspective view of the alignment mechanism, and B is a sectional view taken along the line A-A' in A. , C is a partial sectional view of the welding device. FIGS. 2A, B, and C are diagrams for explaining another embodiment of the present invention, in which A is a perspective view of the alignment machine;
B and C are A-A' line and B- in A, respectively.
FIG. 3 is a diagram showing a cross section taken along line B'. FIG. 3 is a diagram for explaining still another embodiment of the present invention. 1... Upper welding electrode, 2... Positioning mechanism, 2
a, 2f... Fixed side end plate, 2d, 2h... Free side end plate, 2b, 2c, 2e, 2g... Elastic plate, 3...
... Holder, 5 ... Conversion element, 8 ... Automatic control device, 9 ... Fixing plate, 10 ... Lower welding electrode, 11
...Base, 12...Connector.

Claims (1)

[Claims] 1. A device having a fixed end and a free end, with the free end side being the first
a first plate-shaped elastic body that can be displaced in a first axial direction by a fine adjustment device; a fixed end fixed to the first plate-shaped elastic body and a free end, the free end being a second plate-shaped elastic body that can be displaced in a second axial direction perpendicular to the first axial direction by a second fine adjustment device; and a second plate-shaped elastic body mechanically coupled to the second plate-shaped elastic body. a first welding electrode that is movable in the first and second axial directions by displacement of free ends of the first and second plate-shaped elastic bodies; and a first welding electrode that is arranged to face the first welding electrode. and a second welding electrode, the positions of the first and second members to be welded fixed to the first and second welding electrodes are adjusted by the first and second fine adjustment devices. A welding device having a function of positioning parts to be welded, which performs welding after alignment.