Hybrid integrated circuit device and method of manufacturing the same
View Patent ↗To provide a hybrid integrated circuit device in which the rear surface of a circuit board is exposed to the outside and a method of manufacturing the same. Here, leads are fixed to the surface of the circuit board along one side thereof. A method of manufacturing a hybrid integrated circuit device includes the steps of forming an electric circuit which includes a conductive pattern formed on a surface of a circuit board and a circuit element electrically connected to the conductive pattern, fixing a lead to a pad formed of the conductive pattern, housing the circuit board in a cavity of molds, and fixedly supporting the lead by clamping the lead between the molds, and performing sealing by filling inside of the cavity with sealing resin with the rear surface of the circuit board made in contact with an inside bottom surface of the molds.
1. A method of manufacturing a hybrid integrated circuit device, comprising: forming an electric circuit which includes a conductive pattern formed on a surface of a circuit board and a circuit element electrically connected to the conductive pattern; fixing a lead to a pad formed of the conductive pattern; housing the circuit board in a cavity of molds, and fixedly supporting the lead by clamping the lead between the molds; and performing sealing by filling inside of the cavity with sealing resin with the rear surface of the circuit board made in contact with an inside bottom surface of the molds,
wherein, in the step of fixing the lead, the lead is supported by clamping the lead between the molds and thereby the circuit board is fixed in a direction oblique with respect to the inside bottom surface of the molds, and the weight of the sealing resin and pressure are used to allow the rear surface of the circuit board to come in contact with the inside bottom surface of the molds.
2. The method of manufacturing a hybrid integrated circuit device according to claim 1 , wherein a rear surface of the pad is bonded to the circuit board via a first adhesive, the lead is bonded to a surface of the pad via a second adhesive which has a higher bonding strength than that of the first adhesive, and the weight of the sealing resin and pressure are used to allow the rear surface of the circuit board to come in contact with the inside bottom surface of the molds, and thereby the rear surface of the pad is separated from the circuit board in a state where the front surface of the pad is bonded to the lead.
3. The method of manufacturing a hybrid integrated circuit device according to claim 2 , wherein the first adhesive is an adhesive having insulating properties, and the second adhesive is a conductive adhesive.
4. The method of manufacturing a hybrid integrated circuit device according to claim 2 , wherein the first adhesive is an adhesive which includes a resin, and the second adhesive is an adhesive which is made of metal.
5. The method of manufacturing a hybrid integrated circuit device according to claim 2 , wherein the first adhesive for bonding the rear surface of the pad to the circuit board is made of a material which softens up at temperature lower than that of the molds when the sealing is performed, the circuit board is placed inside the molds, thereby leading to the softening up of the first adhesive, and the bonding strength of the first adhesive is reduced, and the weight of the sealing resin and pressure are used to allow the rear surface of the circuit board to come in contact with the inside bottom surface of the molds, and thereby the rear surface of the pad is separated from the circuit board in a state where the front surface of the pad is bonded to the lead.
6. The method of manufacturing a hybrid integrated circuit device according to claim 5 , wherein the first adhesive is an adhesive which includes a resin.
7. The method of manufacturing a hybrid integrated circuit device according to claim 2 , wherein the sealing resin is filled in a gap between the separated pad and the circuit board.