초록 ▼

A BGA mould assembly which can facilitate high degree of control over the clamping force on BGA substrates of varying thickness. An Independent drive is provided for each of the dual in-line cavity bars which clamp the BGA substrates. The drive mechanism is a wedge press which includes a servo motor

A BGA mould assembly which can facilitate high degree of control over the clamping force on BGA substrates of varying thickness. An Independent drive is provided for each of the dual in-line cavity bars which clamp the BGA substrates. The drive mechanism is a wedge press which includes a servo motor, and a linear-conversion mechanism coupled to the servo motor to convert the rotation motion of the motor to a linear movement. An input wedge is coupled to the linear-conversion mechanism such that the input wedge moves correspondingly with the linear movement of the linear conversion mechanism. An output wedge is coupled to the cavity bar and positioned such that a horizontal movement by the input wedge causes the output wedge to move downwards. A roller cage is provided at the top and bottom of the input wedge to reduce friction.

대표청구항 ▼

[ We claim:] [1.] A BGA mould assembly for facilitating an encapsulation of BGA substrates having varying thickness, said assembly having dual in-line cavity bars which clamp BGA substrates during an encapsulation process, said mould assembly comprising:a first drive mechanism for controllably apply

[ We claim:] [1.] A BGA mould assembly for facilitating an encapsulation of BGA substrates having varying thickness, said assembly having dual in-line cavity bars which clamp BGA substrates during an encapsulation process, said mould assembly comprising:a first drive mechanism for controllably applying clamping force to a first cavity bar for clamping a first BGA substrate, a second drive mechanism for controllably applying clamping force to a second cavity bar for clamping a second BGA substrate, said first drive mechanism and second drive mechanism each including,a servo motor;a linear-conversion means coupled to said servo motor for converting a rotation motion created by said servo motor to a linear movement;an input wedge having a top and bottom coupled to said linear-conversion means such that said input wedge moves correspondingly with said linear movement generated by the linear conversion means;an output wedge coupled to the first and second cavity bars, said output wedge situated such that a movement by said input wedge causes said output wedge to move in a direction substantially perpendicular to the movement of said input wedge;a friction-reducing means disposed on said top and bottom of said input wedge for reducing friction during the movement of said input wedge;a supporting frame for said drive mechanisms,whereby said first drive mechanism and said second drive mechanism can control said first cavity bar and said second cavity bar independently from each other such that a different clamping force can be applied to said first and second drive mechanisms to account for a different thickness between said first and second BGA substrates.