Patent ID: 6116427
Filing Date: 2000-09-12
Classification: H01L,H05K

Abstract:
A tray adapted to receive a plurality of ball grid array devices therein, each of the ball grid array devices having a bottom side formed with an array of ball contacts, said tray comprising:a base plate having a device-receiving portion and a peripheral portion around said device-receiving portion,said device-receiving portion having a top side formed with a device-receiving recess, said top side of said device-receiving portion being further formed with partition means in said device-receiving recess for dividing said device-receiving recess into a plurality of cavities adapted for receiving the ball grid array devices respectively therein,said device-receiving portion further having a bottom side formed with a plurality of openings, each of said openings being aligned with a corresponding one of said cavities and being adapted to receive the array of ball contacts on the ball grid array device that is disposed in the corresponding one of said cavities therein, said openings being grouped into a set of first openings remote from said peripheral portion and a set of second openings surrounding said first openings and adjacent to said peripheral portion,a plurality of guard strips being formed on said bottom side of said device-receiving portion and being disposed solely and respectively in said set of second openings to protect the ball contacts on the ball grid array devices received in said cavities that are adjacent to said peripheral portion,said peripheral portion having a bottom side formed with a peripheral groove therealong, said peripheral portion further having an upwardly extending surrounding wall that cooperates with said top side of said device-receiving portion to form a buffer space,said top end of said surrounding wall of a lower tray being capable of abutting against said bottom side of said peripheral portion of an upper tray at said peripheral groove such that said bottom side of said device-receiving portion of the upper tray extends into said buffer space in the lower tray and such that said bottom side of said device-receiving portion of the upper tray is spaced apart from said top side of said device-receiving portion of the lower tray.