Patent ID: 8829561

Claim:
A metallic frame structure, comprising: a metallic frame having an imaginary plane and including a first lead frame having a protruding portion; a second lead frame, the protruding portion extending toward the second lead frame; and an electrically insulated region defined between the first and second lead frames; wherein a biggest circle is defined on the imaginary plane; wherein at least one first blind hole and at least one second blind hole are selectively formed on at least one of the first lead frame and the second lead frame, the first blind hole formed concavely on an upper surface of the metallic frame and located substantially adjacent to a circumference of the biggest circle, and the second blind hole formed in proximate to the electrically insulated region; wherein the at least one first blind hole is distributed around the chip-mounting area that the at least one chip is mounted thereon, and the at least one second blind hole is communicated with the electrically insulated region.