JP2001007127A - Method for filling filler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a filler from adhering to a test pad around parts and the parts by using a sealing tool for covering the surrounding of the parts with a filling vent and an exhaust vent, and forcibly filling the filler between the parts and a substrate. SOLUTION: A sealing tool 3 using a fluororesin material is installed so that there is no gap between the end face of parts 2 and a substrate 1, and a filling apparatus 6 is fitted to a filling vent 4 until a filler 7 is overflowed from an exhaust vent 5. Then, after the filling is completed, the filling apparatus 6 is extracted from the sealing tool 3 and the filler 7 is cured. After the curing, the sealing tool 3 is removed from the surrounding of the parts 2, thus quickly performing filling without any retention of bubbles at the lower portion of the parts 2 and forcibly evacuating the lower portion of the parts 2 and hence a filling speed can be further increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a process for mounting components on a board in the manufacture of a printed board unit,
The present invention relates to filling of a reinforcing filler used for the purpose of improving the reliability of a joint between a component and a board.

In such filling, it is required that the space between the component and the substrate be sufficiently filled in a short time, and that the filler does not adhere to the surrounding test pads / components.

[0003]

2. Description of the Related Art Conventionally, in order to reinforce a joint between a component and a substrate, a filler is extruded from a filling device and is filled in the lower surface of the component mounted on the substrate.

FIG. 7 shows a case where the gap D0 between the component 2 and the board 1 is appropriately narrow, for example, about 0.5 mm, and a case where a standard epoxy resin filler 7 (viscosity of about 24 Pa · s) is used. Show. In this case, the filler 7 is attracted to the lower part of the component 2 by the capillary action between the component 2 and the substrate 1, and becomes lower at room temperature.
In about a minute, a part width of 10 mm can be permeated and a sufficient filling between the part 2 and the substrate 1 can be achieved.

However, in a component using a ball grid array of a ceramic package, as shown in FIG. 8, the gap D0 between the component 2 and the substrate 1 is wide, for example, about 0.8 mm, and the filler 7 is drawn in by a capillary phenomenon. Is difficult to fill, so that it is filled around the part 2. In this case, the filling is performed once, and the filling is performed again after being left for several minutes in order to allow the filler 7 to penetrate into the lower part of the component 2.

[0006]

In the conventional filling method, a long time is required because of the necessity of a leaving step. In addition, bubbles remain at the lower part of the component 2 and reinforcement is incomplete, so that sufficient reliability can be obtained. Absent.

In addition, since the filler 7 is dripped around the component and adheres to the peripheral component within a range of about 10 mm from the outer periphery of the component, the use of the test pad is restricted and the repair work of the component is hindered. There is a problem of giving.

SUMMARY OF THE INVENTION It is an object of the present invention to solve such a problem and to sufficiently fill a lower portion of a component in a short time, and to prevent a filler from adhering to a test pad or a component around the component.

[0009]

In order to solve the above-mentioned problems, the present invention forcibly fills a filler by using a sealing jig having a filling port and an exhaust port and covering the periphery of a component. It is characterized by the following.

[0010]

FIG. 1 shows an embodiment of a filling method according to the present invention. The sealing jig 3 is installed so that there is no gap between the end surface of the component 2 and the substrate 1, the filling tool 6 is mounted on the filling port 4, and filling is performed until the filling material 7 overflows from the exhaust port 5.
After the filling is completed, the filling tool 6 is removed from the sealing jig 3 and the filler 7 is cured. After the filling material 7 is cured, the sealing jig 3 is removed from around the component 2.

As a result, it is possible to perform sufficient filling in one filling, that is, in a short time, and to eliminate the adhesion of the filler 7 around the components.

As a material of the sealing jig of the present invention, a filler,
For example, by using an epoxy-based filler 7 and a material having good releasability, for example, a fluorine-based resin, it is easy to remove the sealing jig 3 after the filler 7 is cured.

FIG. 2 shows an embodiment of the sealing jig 3 having a two-layer structure. The sealing jig 3 is formed of a metal plate and has a structure in which a fluorine-based resin is adhered to the surface. Features. Since a metal plate is used as the structural material of the sealing jig and the surface is made of a fluorine-based resin, an easily removable sealing jig can be configured at low cost.

FIG. 3 shows an embodiment of a filling method using a sealing jig made of an elastic material. In the present embodiment, the outer circumference L1 and the width D1 of the sealing jig 13 made of an elastic material are
0, and is made of a ring-shaped or frame-shaped elastic material wider than the gap D0 between the component 2 and the substrate 1, and the sealing jig 13 is provided so as to cover the periphery of the component 2 and the space between the substrate 1. Install. The filling of the filler 7 is performed by expanding the sealing jig 13 made of an elastic material to form a filling port and an exhaust port, and mounting the filling device 6 and the exhaust pipe 15. After the filling material 7 is filled, the filling device 6 and the exhaust pipe 15 are pulled out and sealed by the contracting force of the sealing jig 13 made of an elastic material.

As shown in FIG. 4, the cross section of the filling device and the exhaust pipe used here is desirably a shape that reduces the gap between the sealing jig 13 and the component 2 made of an elastic material, for example, a semicircular shape.

Since the sealing jig of this embodiment does not take up space, the filling operation may be completed with the sealing jig mounted.

When the sealing jig 13 made of an elastic material is removed after the filling, a filler, for example, an epoxy-based filler 7 and a material having good releasability, for example, a fluorine rubber, are used as the elastic material. After the filling material 7 is cured, the sealing jig 3 can be easily removed.

FIG. 5 shows another embodiment in which the substrate 1 is inclined in each of the above embodiments. By inclining the substrate 1 so that the filling port 4 is at the bottom and the exhaust port 5 is at the top, the filling material 7 is filled from below by the own weight of the filling material 7. Can be increased.

In each of the above-described embodiments, a forced exhaust means such as a vacuum pump is connected to the exhaust port 5 or the exhaust pipe 15, and the lower portion of the component 2 is exhausted before or at the same time as filling, and is released after filling. This makes it possible to prevent bubbles from remaining at the lower part of the component 2 even when the filling speed is increased.

Further, by making the shape of the sealing jig 13 made of an elastic material conform to the shape of the filling device and the exhaust pipe as shown in FIG. 6, it is possible to improve the airtightness and enhance the exhaust effect. .

The sealing jig of the present invention is used to regulate the area to be filled, thereby preventing the filler from adhering to the periphery of the component due to sagging. By filling, it is possible to fill in a short time without remaining bubbles in the lower part of the component. Further, by performing the forced exhaust of the lower part of the component, the filling speed can be further increased.

[0022]

Conventionally, the filling operation time: 20 minutes (filling rate:
What was 70%, the test pad due to the filler sagging and the area where the filler adheres to the parts: 10 mm around the part, but the filling work time: 3 minutes (filling rate: 100%, the test pad due to sagging of the filler) (A range where the filler adheres to the component: 0 mm around).

Further, when the filling operation is completed with the sealing jig made of an elastic material mounted, the work time can be greatly reduced by omitting the filling material curing step and the removing step of the sealing jig. Become.

[Brief description of the drawings]

FIG. 1 shows a filling method according to the present invention.

FIG. 2 shows an embodiment of a sealing jig having a two-layer structure.

FIG. 3 A filling method using a sealing jig made of an elastic material.

FIG. 4 shows an example in which the cross section of the filling device and the exhaust pipe is semicircular.

FIG. 5 shows an embodiment of the present invention in which the substrate is inclined.

FIG. 6 shows another embodiment of a sealing jig made of an elastic material.

FIG. 7: When the gap between the component and the board is appropriately narrow

FIG. 8 When the gap between the component and the board is wide

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Component 3 Sealing jig 4 Filling port 5 Exhaust port 6 Filling instrument 7 Filler 13 Sealing jig made of elastic material 15 Exhaust pipe D0 Gap between component and substrate D1 Width of sealing jig made of elastic material L0 Part Outer circumference L1 Outer circumference of elastic material sealing jig

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI theme coat ゛ (Reference) H05K 3/28 H05K 3/28 B 5F061 F term (Reference) 4D075 AC02 BB56Y DA06 DA33 DC21 EA05 EA60 EB16 EB33 4F041 AA05 CA02 CA11 CA13 4F042 AA06 AB00 DC00 DF07 4M109 AA01 BA03 CA06 DB07 5E314 AA39 BB06 BB09 BB11 CC00 FF01 GG19 5F061 AA01 BA03 CA06

Claims (4)

[Claims] 1. A method of filling a lower surface of a component mounted on a substrate with a filler, wherein a filling area provided with a filling port and an exhaust port is filled with a sealing jig surrounding the component. A filling method of a filling material, wherein the filling is regulated and the filling material is forcibly filled with a filling device from a filling port. 2. A method of filling a lower surface of a component mounted on a substrate with a filler, wherein the sealing jig is made of an elastic material having an outer periphery smaller than the outer periphery of the component. After regulating the area to be filled by covering the periphery of the component with a fixing jig, a filling device and an exhaust pipe are mounted between the sealing jig and the component, and the filler is forcibly filled with the filling device. A method for filling a filler, characterized in that: 3. The filling method according to claim 1, wherein the substrate is tilted, a filling port or a filling device is installed below, and an exhaust port or an exhaust pipe is installed above,
A method for filling a filler, comprising forcibly filling. 4. The filling method according to claim 1, 2 or 3, wherein forced exhaust is performed from an exhaust port.