Method of manufacturing a packaging substrate
First Claim
1. A method of manufacturing a packaging substrate wherein a first conductor pattern is formed by intaglio printing on a circuit substrate and a first ball-shaped solder is joined to a second conductor pattern formed on the opposite side of said circuit substrate, said method comprising processes of:
- (a) forming an intaglio on the surface of a flexible material by making a patterned groove corresponding to the first conductor pattern,(b) repeatedly filling and drying a conductive paste in the groove of said intaglio,(c) transferring the conductive paste pattern onto the circuit substrate by bonding the intaglio with said circuit substrate through applying heat and pressure, and then peeling off said intaglio from said circuit substrate,(d) firing said circuit substrate and said transferred conductive paste pattern,(e) forming said second conductor pattern printed on the side of the circuit substrate opposite to said first conductor pattern,(f) connecting said second and first conductor patterns by means of a conductive material located in a through hole of the circuit substrate, and(g) joining the first ball-shaped solder to said second conductor pattern on the circuit substrate,wherein a surface roughness of said circuit substrate is made larger on a printing surface of the second conductor pattern than on a printing surface of the first conductor pattern.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides a packaged substrate which has a superior positioning accuracy of wiring formed on a circuit substrate made of ceramics, and a conductive pattern with a thick film and yet a fine pattern. On a surface of flexible base member made of plastic, fine grooves are formed in a pattern corresponding to a first conductive pattern so that a cavity face is produced. Conductive paste is filled and into the grooves on this cavity face, and then dried. The cavity face and a circuit substrate are pasted with each other by applying predetermined heat and pressure. A pattern of the dried conductive paste is transcribed onto the circuit substrate, and then the first conductive pattern is formed by firing. A first ball solder is coupled with a second conductive pattern which is coupled to the first conductive pattern through an electrode in a through-hole of the circuit substrate.
-
Citations
21 Claims
-
1. A method of manufacturing a packaging substrate wherein a first conductor pattern is formed by intaglio printing on a circuit substrate and a first ball-shaped solder is joined to a second conductor pattern formed on the opposite side of said circuit substrate, said method comprising processes of:
-
(a) forming an intaglio on the surface of a flexible material by making a patterned groove corresponding to the first conductor pattern, (b) repeatedly filling and drying a conductive paste in the groove of said intaglio, (c) transferring the conductive paste pattern onto the circuit substrate by bonding the intaglio with said circuit substrate through applying heat and pressure, and then peeling off said intaglio from said circuit substrate, (d) firing said circuit substrate and said transferred conductive paste pattern, (e) forming said second conductor pattern printed on the side of the circuit substrate opposite to said first conductor pattern, (f) connecting said second and first conductor patterns by means of a conductive material located in a through hole of the circuit substrate, and (g) joining the first ball-shaped solder to said second conductor pattern on the circuit substrate, wherein a surface roughness of said circuit substrate is made larger on a printing surface of the second conductor pattern than on a printing surface of the first conductor pattern. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
-
-
18. A method of manufacturing a packaging substrate comprising processes of:
-
(a) forming an intaglio on the surface of a flexible material by making a patterned groove corresponding to a first conductor pattern, (b) repeatedly filling and drying a conductive paste in the patterned groove of said intaglio, (c) transferring the conductive paste pattern onto the circuit substrate by bonding the intaglio with said circuit substrate through applying heat and pressure, and then peeling off said intaglio from said circuit substrate, (d) firing said circuit substrate and said transferred conductive paste pattern, and (e) forming a second conductor pattern printed on the side of the circuit substrate opposite to said first conductor pattern; wherein a surface roughness of said circuit substrate is made larger on a printing surface of the second conductor pattern than on a printing surface of the first conductor pattern.
-
-
19. A method of manufacturing a packaging structure wherein a first conductor pattern is formed by intaglio printing on a circuit substrate and a first ball-shaped solder is joined to a second conductor pattern formed on the opposite side of said circuit substrate, said method comprising processes of:
-
(a) forming an intaglio on the surface of a flexible material by making a patterned groove corresponding to the first conductor pattern, wherein said forming an intaglio comprises forming a thinner land portion of the first conductor pattern in a shallower groove of the intaglio comprising at least two depths of grooves, (b) repeatedly filling and drying a conductive paste in the groove of said intaglio, (c) transferring the conductive paste pattern onto the circuit substrate by bonding the intaglio with said circuit substrate through applying heat and pressure, and then peeling off said intaglio from said circuit substrate, (d) firing said circuit substrate and said transferred conductive paste pattern, (e) forming said second conductor pattern printed on the side of the circuit substrate opposite to said first conductor pattern, (f) connecting said second and first conductor patterns by means of a conductive material located in a through hole of the circuit substrate, (g) joining the first ball-shaped solder to said second conductor pattern on the circuit substrate, and (h) electrically connecting an LSI chip having bumps through said bumps by face-down mounting on said thinner land portion of the first conductor pattern.
-
-
20. A method of manufacturing a packaging substrate wherein a first conductor pattern is formed by intaglio printing on a circuit substrate and a first pillar-shaped solder is joined to a second conductor pattern formed on the opposite side of said circuit substrate, said method comprising processes of:
-
(a) forming an intaglio on the surface of a flexible material by making a patterned groove corresponding to the first conductor pattern, (b) repeatedly filling and drying a conductive paste in the groove of said intaglio, (c) transferring the conductive paste pattern onto the circuit substrate by bonding the conductive paste filled side of the intaglio with said circuit substrate through applying heat and pressure, and then peeling off said intaglio from said circuit substrate, (d) firing said circuit substrate and said transferred conductive paste pattern, (e) forming said second conductor pattern printed on the side of the circuit substrate opposite to said first conductor pattern, (f) connecting said second and first conductor patterns by means of a conductive material located in a through hole of the circuit substrate, (g) filling, melting, and solidifying a second solder in the empty space of said through hole of the circuit substrate, (h) making a casting plate having holes come in close contact with a substrate surface of said circuit substrate on which the second conductor pattern is formed, (i) applying a solder paste in the holes, or in the holes and their peripheral of said casting plate, (j) pouring the solder into the holes of said casting plate by melting the solder paste thereby forming a first pillar-shaped solder, and (k) removing said casting plate from said circuit substrate after said first pillar-shaped solder has been solidified, wherein a surface roughness of said circuit substrate is made larger on a printing surface of the second conductor pattern than on a printing surface of the first conductor pattern. - View Dependent Claims (21)
-
Specification