JPH0429571Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field This invention relates to a heat treatment jig used, for example, when brazing a heat sink to a metal outer ring of a hermetic terminal for a laser diode.

BACKGROUND ART An example of an airtight terminal for a laser diode will be described with reference to FIGS. 3 and 4. 1 is a metal outer ring, 2a and 2b are two round holes 3,
2 inserted into 3 and sealed with glass 4, 4
The main lead wire 2c is a grounding lead wire whose end face is welded to the lower surface of the metal outer ring 1. 5 is a heat sink such as a copper block soldered onto the metal outer ring 1 with a brazing material 6 such as silver solder, and 7 is a rectangular inclined recess formed near the center of the upper surface of the metal outer ring 1. Reference numeral 8 denotes a laser light emitting element, which is electrically and mechanically fixed to the upper part of one side of the heat sink 5 facing the inclined recess 7 . Reference numeral 9 denotes a monitoring light-receiving element electrically and mechanically fixed to the inclined bottom surface of the inclined recess 7. The surface electrodes of the light emitting element 8 and the light receiving element 9 are electrically connected to the current-carrying lead wires 2a and 2b by thin metal wires (not shown), and the back electrodes of the light emitting element 8 are connected to the heat sink 5 and the metal outer ring. 1, the back electrode of the light receiving element 9 is electrically connected to the lead wire 2c via the metal outer ring 1. Reference numeral 10 denotes a cap that is airtightly fixed on the outer periphery of the metal outer ring 1, and a transparent member 11 is fixed to a window 10a formed in the top plate portion.

When the light emitting element 8 is energized to emit light, a portion of the light passes through the transparent member 11 of the cap 10 and
The laser beam 12 is emitted to the outside. Further, a part of the light from the light emitting element 8 is received by the light receiving element 9, and the presence or absence of light emission from the light emitting element 8 is monitored based on the output signal of the light receiving element 9.

By the way, in the above airtight terminal for a laser diode, if the soldering strength and positioning accuracy of the heat sink 5 which is brazed onto the metal outer ring 1 is poor, various problems will occur. High brazing strength and positioning accuracy are required.

Conventionally, in order to accurately braze the heat sink 5 onto the metal outer ring 1, a step is provided on the upper surface of the metal outer ring 1, and the side surface of the heat sink 5 is positioned by abutting the side surface of this step. Method [Unexamined Japanese Patent Publication No. 1983-
No. 172256], but it requires a stepped portion, which increases costs. Therefore, for example, a method is used in which a large number of heat sinks 5 are brazed at once using a brazing jig as schematically shown in FIG. [Unexamined Japanese Patent Publication No. 172257/1983] has been proposed. This brazing jig includes a first jig 13, a second jig 14, and a third jig 15 made of carbon.
This is a combination of the following, and will be explained in sequence below.

The first jig 13 has a plurality of recesses 16 formed in its upper surface into which the metal outer ring 1 is fitted. The second jig 14 is the first
It is positioned and placed on a jig 13, and an insertion hole 17 for the heat sink 5 is formed at a position facing the recess 16. The third jig 15 is the second jig 1
4, and has a protrusion 18 formed on the lower surface thereof to be fitted into the insertion hole 17 of the second jig 14.

The top brazing jig is used as follows. First, the metal outer ring 1 is fitted into the recess 16 of the first jig 13. Next, the second jig 14 is positioned and placed on the first jig 13 using positioning pins (not shown), and then the brazing material 6 and the heat sink 5 are inserted into the insertion hole 17 of the second jig 14. Supply falling sequentially. Then, the heat sink 5 is placed on the metal outer ring 1 with the brazing material 6 interposed therebetween. Next, place the third jig 1 on the second jig 14.
5 is placed by inserting the protrusion 18 into the insertion hole 17.
Then, the heat sink 5 is pressed against the protrusion 18 from above. After that, the first to third jigs 13 to 1
While stacking the heat sinks 5, the brazing material 6 is heated and melted by passing it through a heating furnace (not shown) to braze the heat sink 5.

Problems to be solved by the invention By the way, in the above brazing jig, the third jig 15
A large number of protrusions 18 integrally formed on the lower surface of the heat sink 5 pressurize and braze the large number of heat sinks 5. However, at that time, a large number of heat sinks 5
At the same time, the projections 18 of the third jig 15 pressurize and solder the heat sinks 5, so if even one heat sink 5 has a high top surface height due to dimensional tolerances of the heat sinks 5 or misalignment during assembly, other heat sinks 5 is no longer pressurized by the protrusion 18 of the third jig 15. As a result, if the heat sink 5 is not pressurized by the protrusion 18 of the third jig 15, brazing will be insufficient, and the thermal resistance of the bonded portion between the heat sink 5 and the metal outer ring 1 will increase, and the light emitting element 8 heat dissipation was likely to be insufficient. Furthermore, the brazing strength was weak, and the heat sink 5 sometimes came off and fell off the metal outer ring 1 during finish plating after brazing. Also,
If the heat sink 5 is not pressurized by the protrusion 18 of the third jig 15, the heat sink 5 will be removed by taking into consideration the component precision of the heat sink 5, the processing precision of the jig, the difference in thermal expansion coefficient between the heat sink 5 and the jig, etc. Since the inner dimensions of the insertion hole 17 of the second jig 14 are set larger than the dimensions, the heat sink 5 moves within the insertion hole 17, resulting in poor positioning accuracy and the position of the heat sink 5 must be corrected after brazing. There was a problem of increasing the number of steps.

Therefore, if a weight is placed on each of the heat sinks 5 to apply pressure, the above-mentioned problem can be solved, but it requires too many assembly steps and is not practical.

Means for Solving the Problems This invention is a solution to the above problems, and includes a plurality of recesses into which the first heat treatment member is fitted, an insertion hole for the second heat treatment member facing the recesses, A heat treatment jig is provided which includes a ceramic spring that presses a second heat treatment member placed on the first heat treatment member fitted into the recess in a predetermined direction via a pressing block.

Function: By pressurizing each second heat-treated member with a ceramic spring through an individual pressure block, all of them can be sufficiently pressurized even if there are variations in the height of the upper surface.

Embodiment Hereinafter, an embodiment in which this invention is applied to a brazing jig used for brazing a heat sink 5 onto the metal outer ring 1 of the hermetic terminal for a laser diode shown in FIGS. 3 and 4 will be described. This will be explained in detail based on FIG.

The brazing jig shown in FIG. 1 is composed of three flat carbon first to third jigs 19, 20, and 21.

The first jig 19 and the second jig 20 have the same structure as the first jig 13 and the second jig 14 shown in FIG. 5, for example. That is, the first jig 19 has a plurality of recesses 22 formed on its upper surface into which the metal outer ring 1 is fitted. The second jig 20 is positioned and placed on the first jig 19, and has an insertion hole 23 for the heat sink 5 formed at a position facing the recess 22.

The characteristics of the brazing jig of this example are as follows:
This is the third jig 21. This third jig 21 is positioned and placed on the second jig 20, and has a recess 24 formed on its lower surface at a position corresponding to the insertion hole 23 of the second jig 20. The insertion hole 2
3, a ceramic spring 26 is placed between the press block 25 and the third jig 21 with one end fixed to the block 25 and the other end fixed to the third jig 21. I am intervening. This ceramic spring 26 is made of, for example, partially stabilized zirconia.

Next, a procedure for brazing the heat sink 5 using the first to third jigs 19 to 21 will be explained. First, the fifth
Similarly to the conventional example shown in the figure, the recess 2 of the first jig 19 is
2, and then fit the first jig 19 into the metal outer ring 1.
After positioning and placing the second jig 20 on top,
The brazing material 6 and the heat sink 5 are sequentially dropped and supplied into the insertion hole 23 of the jig 20. Next, the third jig 21 is placed on the second jig 20 and the pressing block 25 is inserted into the insertion hole 23.
Insert and place. Then, heat block 5
The pressure block 25 comes into elastic contact with the pressure block 25 and is pressed from above. After that, heat treatment is performed while the first to third jigs 19 to 21 are piled up, so that the brazing material 6 is melted and the heat sink 5 is brazed onto the metal outer ring 1.

In such a brazing operation, even if the height of the top surface of the heat sink 5 varies due to the dimensional tolerance of the heat sink 5, the individual pressing blocks 25 are brought into pressure contact with each of the heat sinks 5. All the heat sinks 5 can be sufficiently pressurized, therefore, the thermal resistance of the bonded portion between the heat sink 5 and the metal outer ring 1 can be reduced, and the light emitting element 8 can be
heat dissipation can be carried out efficiently, the brazing strength can be improved, and there is no fear that the heat sink 5 will come off from the metal outer ring 1 during finish plating after brazing, and moreover, the heat sink 5 can be inserted into the insertion hole 23. Since the heat sink 5 does not move within the insertion hole 23, if the heat sink 5 is dropped and supplied into the insertion hole 23 and then the entire jig is tilted to achieve positioning accuracy, the heat sink 5 can be brazed with high positioning accuracy.

Next, another embodiment of this invention will be explained based on FIG. 2. In this case, for example, the third jig 21 of the brazing jig shown in FIG. forming a block groove 27 communicating with 23;
A pressing block 25 is fitted into this block groove 27 via a ceramic spring 26, and the insertion hole 2
The heat sink 5 dropped into the heat sink 3 is pressed against the inner surface (positioning surface) of the insertion hole 23 by the pressing block 25, and is always brazed at a constant position. This eliminates the need to correct the position of the heat sink 5 after brazing.

Although this invention has been variously explained above with reference to preferred embodiments, this invention is not limited to these embodiments, and it goes without saying that various changes can be made. For example, in the embodiment, the case of brazing a heat sink to the metal outer ring of an airtight terminal for a laser diode was described, but brazing a ground lead wire, brazing a pressure pipe in an airtight terminal for a semiconductor pressure transducer, or brazing a lead wire. It can also be applied to glass sealing, etc.

Effects of the invention According to this invention, all the heat treatment members (heat sinks, etc.) are sufficiently pressurized, so it is possible to provide a heat treatment jig with excellent fixing strength and positioning accuracy.

[Brief explanation of the drawing]

Fig. 1 is a partial sectional view showing an embodiment of the heat treatment jig according to this invention, Fig. 2 is a partial sectional view showing another embodiment of this invention, and Fig. 3 is a main part of an airtight terminal for a laser diode. 4 is a plan view with the cap removed, and FIG. 5 is a partial sectional view showing a conventional soldering jig for a hermetic terminal for a laser diode. 19...first jig, 20...second jig, 21...
...Third jig, 22... Recess, 23... Insertion hole, 2
5... Pressing block, 26... Ceramic spring.

Claims (1)

[Scope of utility model registration request] A plurality of recesses into which the first heat treatment members are fitted, an insertion hole for the second heat treatment member facing the recesses, and a second heat treatment member placed on the first heat treatment member fitted into the recesses.
A heat treatment jig characterized by comprising a ceramic spring that presses a heat treatment member in a predetermined direction via a pressing block.