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A mold structure for package fabrication is proposed, and includes a top mold, a fixture and a bottom mold. The top mold is formed with at least an upwardly recessed portion; the fixture is formed with a plurality of downwardly recessed portions; and the bottom mold has a recessed cavity for receivi

A mold structure for package fabrication is proposed, and includes a top mold, a fixture and a bottom mold. The top mold is formed with at least an upwardly recessed portion; the fixture is formed with a plurality of downwardly recessed portions; and the bottom mold has a recessed cavity for receiving the fixture therein, and adapted to be engaged with the top mold, wherein a resilient member is disposed on an inner wall of the recessed cavity, and interposed between the fixture and the recessed cavity of the bottom mold, allowing the resilient member to provide a resilient force for properly positioning the fixture. By using the above mold structure, chips mounted on a substrate can be firmly supported in the mold structure without causing chip cracks during a molding process for encapsulating the chips.

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1. A mold structure for package fabrication, comprising:a top mold formed with at least an upwardly recessed portion; a fixture formed with a plurality of downwardly recessed portions; and a bottom mold having a recessed cavity for receiving the fixture therein, and adapted to be engaged with the to

1. A mold structure for package fabrication, comprising:a top mold formed with at least an upwardly recessed portion; a fixture formed with a plurality of downwardly recessed portions; and a bottom mold having a recessed cavity for receiving the fixture therein, and adapted to be engaged with the top mold, wherein the bottom mold is formed with a protruding portion protruding from an inner wall of the recessed cavity and a resilient member disposed on the inner wall of the recessed cavity underneath the protruding portion such that the protruding portion cooperates with the resilient member to abut against the same side of the fixture for properly positioning the fixture in the bottom mold. 2. The mold structure of claim 1, wherein the fixture is formed with a plurality of pins protruding upwardly from a peripheral area of the fixture outside the downwardly recessed portions.3. The mold structure of claim 1, wherein the fixture has an upper surface and a lower surface opposed to the upper surface in a manner that, the upper surface is flush with a surface of the bottom mold where an opening of the recessed cavity is formed, and the lower surface of the fixture abuts against a bottom of the recessed cavity of the bottom mold.4. The mold structure of claim 1, wherein the resilient member is a spring.5. The mold structure of claim 1, wherein the resilient member is made of elastomer.6. A mold structure for package fabrication, for use to form at least an upper encapsulant adapted to encapsulate a plurality of chips mounted on a substrate, wherein each of the chips is mounted on a surface of the substrate in a manner as to cover an opening penetrating through the substrate, and electrically connected to an opposed surface of the substrate by bonding wires through the opening, allowing a plurality of lower encapsulants to be respectively formed on the opposed surface of the substrate for covering the openings and encapsulating the bonding wires, the mold structure comprising:a top mold formed with at least an upwardly recessed portion for accommodating the chips mounted on the substrate therein; a fixture formed with a plurality of downwardly recessed portions that are adapted to be completely engaged with the lower encapsulants formed on the substrate; a bottom mold having a recessed cavity for receiving the fixture therein, and adapted to be engaged with the top mold in a manner as to interpose the substrate between the top and bottom molds and to form the upper encapsulant in the upwardly recessed portion of the top mold, wherein the bottom mold is formed with a protruding portion protruding from an inner wall of the recessed cavity; and a resilient member disposed on the inner wall of the recessed cavity underneath the protruding portion such that the protruding portion cooperates with, the resilient member to a but against the same side of the fixture for positioning the fixture in compliance with the lower encapsulants in the bottom mold. 7. The mold structure of claim 6, wherein the fixture is formed with a plurality of pins protruding upwardly from a peripheral area of the fixture outside the downwardly recessed portions.8. The mold structure of claim 6, wherein the fixture has an upper surface and a lower surface opposed to the upper surface in a manner that, the upper surface is flush with a surface of the bottom mold where an opening of the recessed cavity is formed, and the lower surface of the fixture abuts against a bottom of the recessed cavity of the bottom mold.9. The mold structure of claim 6, wherein the resilient member is a spring.10. The mold structure of claim 6, wherein the resilient member is made of elastomer.11. The mold structure of claim 8, wherein the fixture is formed with a plurality of pins protruding from the upper surface of the fixture outside the downwardly recessed portions, the plurality of pins engaging with a plurality of coupling holes provided in the substrate so as to allow the substrate to be fixed on the fixture.