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Fixture for Capping Electronic

IP.com Disclosure Number: IPCOM000099320D
Original Publication Date: 1990-Jan-01
Included in the Prior Art Database: 2005-Mar-14
Document File: 3 page(s) / 107K

Publishing Venue

IBM

Related People

Gagnage, A: AUTHOR [+3]

Abstract

Encapsulation of single and multichip modules is out by using a fixture which, in a one-stage clamps the cap to the substrate with a force which can be varied linearly over a range of values, thereby compensating for undesired rate variations which may occur in time and allowing clamping force to be selected in accordance with the type.

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This is the abbreviated version, containing approximately 52% of the total text.

Fixture for Capping Electronic

       Encapsulation of single and multichip modules is out by
using a fixture which, in a one-stage clamps the cap to the substrate
with a force which can be varied linearly over a range of values,
thereby compensating for undesired rate variations which may occur in
time and allowing clamping force to be selected in accordance with
the type.

      Conventionally, the encapsulation of electronic modules
applying a consistent specified force, which is type-dependent, for
clamping the cap to the while the assembly is placed in a furnace to
a seal band, residing between the cap and the to melt. As the cap
clamping force to be used upon the type of module to be encapsulated,
the clamping fixtures require clamping springs different rates.
Further, as these springs are to important heat variations, their
mechanical may vary considerably over time, thereby that the spring
loads be periodically monitored the springs replaced, if no longer
within predefined

      The present fixture overcomes the above-mentioned by having, as
shown in Fig. 1, a central coil spring 1 mounted between the clamping
base 2 a cap tool 3 and a transverse bail 4, whose ends are mounted
relative to vertical posts 5 projecting a substrate support plate 6,
with selectively operable  7 provided at both ends of bail 4, to
selectively rigidly secure bail 4 to posts 5, after any desired
movement has been imparted to bail 4, resulting in 1 applying a
linearly adjustable clamping force to tool 3 and hence to cap 8.
Posts 5 are secured to plate 6 such that they can slightly pivot in
any but cannot move axially relative thereto.

      In a first embodiment, as shown in Fig. 2, bail 4 has a bore
9 through which spring 1 extends to engage the area of a leaf spring
10 whose ends are provided apertures 11 for slidably receiving posts
5. The of apertures 11 is chosen to be equal to the of apertures 12,
in bail...