JPH05190724A - Silver-paste curing apparatus - Google Patents

Abstract

PURPOSE:To prevent an accident in a carrying path, where a lead frame is fallen and damaged, and reduce the consumption of a nitrogen gas. CONSTITUTION:A silver-paste curing apparatus comprises a case 1 for storing a lead frame coated with silver paste and filled with a nitrogen gas, and an intermittent transporting mechanism made up of an arm 4, which holds and takes off the case 1 to carry the case 1 intermittently, and its driving unit 5. Then, the cases 1 are put on each heating body 2 arranged as an exemplified illustration so that the silver paste on the lead frame is cured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silver paste curing device, and more particularly to a silver paste curing device for silver paste applied to a lead frame having a thin lead frame.

[0002]

2A and 2B are a sectional view and a plan view showing an example of a conventional silver paste curing apparatus. As shown in FIG. 2, the conventional silver paste curing apparatus includes a heating element 2 for directly heating the lead frame 3, a carrying wire 10 for directly mounting and carrying the lead frame 3, and a cover 8 for covering these. The cover 8 had a discharge part 9 for discharging nitrogen gas so as to create a nitrogen atmosphere.

Next, the curing operation of the silver paste by this silver paste curing device will be described. First, the lead frame 3 is placed on the carrier wire 10 at the carry-in port 6.

Next, after the carrier wire 10 is raised,
The first heating element 2 is advanced to the specified position. Then, it descends and the lead frame 3 is placed on the heating element 2. After that, the transport wire 10 returns to the origin. By repeating this operation, the lead frame 3 moves from the carry-in port 6 to the carry-out port 7.
Be transported to. In the meantime, the lead frame 3 is sequentially heated and cured by the heating element 2 to cure the silver paste.

[0005]

In this conventional silver paste curing apparatus, the lead frame is often deformed by the heating of the heating element. The deformed lead frame is placed on the carrier wire in an unstable state, and the lead frame is However, there is a problem in that the lead frame itself comes into contact with the mechanical part and falls during the transportation, causing a transportation accident, or the lead frame itself becomes a defective product. Further, in order to make the entire interior of the curing device into a nitrogen atmosphere, a large capacity including the transfer mechanism and the like must be filled with nitrogen, and further considering the amount of leakage from the cover, a large amount of nitrogen is wasted. Become.

It is an object of the present invention to provide a mercury paste curing device which can smoothly carry a lead frame and minimize the amount of nitrogen gas used in order to solve such a problem.

[0007]

SUMMARY OF THE INVENTION A silver paste curing apparatus according to the present invention includes a case for accommodating a lead frame coated with a silver paste and being filled with nitrogen gas, an arm for grasping the case, and an intermittent arm for the arm. And a plurality of heating elements arranged side by side in the direction, and the arm holds the case to sequentially place the heating element on the heating element to heat the lead frame. The silver paste is then cured.

[0008]

The present invention will be described below with reference to the drawings.

FIGS. 1A and 1B are a sectional view and a plan view showing a silver paste curing apparatus according to an embodiment of the present invention. This mercury paste curing device holds a lead frame 3 and grips a case 1 filled with nitrogen gas, raises it, feeds it at a predetermined interval, and lowers it to release the case 1 Arm 4
And a drive unit 5 for driving this arm.

Next, the operation of this silver paste cure device will be described. First, the lead frame 3 is stored in advance on the loading table 10, and the case 1 filled with nitrogen gas is placed. Next, grasp the case 1 on the loading table 10 with the arm 4,
It is raised by the drive unit 5 and moved to the first heating element 2. Next, the drive unit 5 lowers the case 1 to place the case on the heating element 2. Then open the arm 4 and open the case 1
The arm 4 is returned to the origin by the drive unit 5. next,
The lead frame 3 is heated by the heating element 2 through the case 1 for a predetermined time, the arm 4 is lowered by the drive unit 5, the arm 4 is closed, and the case 1 is grasped. Next, the arm 4 is raised and the case 1 is moved to the heating element 2 in the next stage. Then, the arm 4 is lowered again and placed on the heating element 2 in the next stage. In this way, the case 1 is intermittently fed, and the respective heating elements 2 are sent.
Sequentially heat with. After that, the case 1 is placed on the heating element 2 in the final stage, and the lead frame 3 is completely cured. After this curing, the case 1 is transferred to the loading table 11.

Thus, unlike the conventional case, the cover including the whole is not required, and it is sufficient to absorb the lead frame into each case 1 and fill the case with nitrogen gas. Further, since the lead frame 3 is housed in a box-shaped case, it is possible to prevent a transportation accident due to a drop and damage to the lead frame.

[0012]

As described above, according to the silver paste curing apparatus of the present invention, by providing the case for accommodating the lead frame and filling with nitrogen gas, and the feeding mechanism for feeding the case intermittently, Since only the case needs to be filled with nitrogen gas, the amount of nitrogen gas used can be reduced. Further, since the lead frame is carried in the case, there is an effect that even if the lead frame is heated and deformed by heat, the lead frame does not drop to cause a transportation accident or damage the lead frame itself.

[Brief description of drawings]

FIG. 1 is a sectional view and a plan view showing an embodiment of a mercury paste curing apparatus of the present invention.

FIG. 2 is a cross-sectional view and a plan view showing an example of a conventional mercury paste curing device.

[Explanation of symbols]

 1 Case 2 Heating Element 3 Lead Frame 4 Arm 5 Drive Unit 6 Carrying In Port 7 Carrying Out Port 8 Cover 9 Discharging Portion 10 Conveyor Wire

Claims (1)

[Claims] 1. An intermittent feeding mechanism including a case for accommodating a lead frame coated with silver paste and filled with nitrogen gas, an arm for grasping the case, and a drive unit for intermittently unidirectionally feeding the arm. And a plurality of heating elements arranged side by side in the direction, the case is grasped by the arm, the heating is sequentially performed on the heating element, and the lead frame is heated to cure the silver paste. Paste cure equipment.