Glass/Metal package and method for producing the same
First Claim
1. A method of making a glass/metal package, comprising the steps of:
- providing a lid having a cavity and a metal leadframe including an array of cells, the leadframe having top and bottom sides and a plurality of leads;
screen printing a solderable paste and a glass paste onto the leadframe, the solderable paste is applied to a plurality of electrical connection locations on the leadframe, the glass paste is applied to cover a central portion of the leadframe leaving the solderable paste and the leads exposed, the covered portion of the leadframe defining a package base;
firing the package base;
applying a seal ring onto a sealing area of at least one of the package base and the lid;
sealing the lid and the package base, the lid and base defining a sealed package; and
singulating the package from the leadframe.
2 Assignments
0 Petitions
Accused Products
Abstract
A method of producing a glass/metal package where a glass portion of the package is built up around a provided leadframe (10) using applications of solderable and glass pastes (20) which are subsequently fired (30). The glass paste and leadframe are chosen to have similar coefficients of expansion and the leadframe is pretreated to degasify and control oxidation of the metal to promote glass adhesion to the leadframe and prevent microcracking at a glass/metal interface. A seal ring is applied to the glass paste (40) and a lid is attached to the seal ring (50). The package is used to provide an sealed inert internal environment for sensitive electronic components such as a piezoelectric element. The package may be configured for leaded or surface mounting (60).
41 Citations
14 Claims
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1. A method of making a glass/metal package, comprising the steps of:
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providing a lid having a cavity and a metal leadframe including an array of cells, the leadframe having top and bottom sides and a plurality of leads; screen printing a solderable paste and a glass paste onto the leadframe, the solderable paste is applied to a plurality of electrical connection locations on the leadframe, the glass paste is applied to cover a central portion of the leadframe leaving the solderable paste and the leads exposed, the covered portion of the leadframe defining a package base; firing the package base; applying a seal ring onto a sealing area of at least one of the package base and the lid; sealing the lid and the package base, the lid and base defining a sealed package; and singulating the package from the leadframe. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of making a glass/metal package, comprising the steps of:
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providing a lid having a cavity and a metal leadframe including an array of cells, the leadframe having top and bottom sides and a plurality of leads; affixing an adhesive backing to the bottom side of the leadframe; screen printing a solderable paste to a plurality of electrical connection locations on the leadframe and drying the solderable paste; filling all gaps in the leadframe with a glass paste and drying the glass paste; screen printing glass paste to the top side of the leadframe leaving the solderable paste and the leads exposed and drying the glass paste; removing the adhesive backing; screen printing glass paste to the bottom side of the leadframe leaving the leads exposed and drying the glass paste, the pastes and leadframe defining a package base; firing the package base; applying a glass frit seal ring onto a sealing area of at least one of the package base and the lid; sealing the lid and the package base, the lid and base defining a sealed package; and singulating the package from the leadframe. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification