摘要:
A lead frame to be used for a semiconductor device, comprising: a heat sink having a peripheral area and a central projected land on which a semiconductor chip is to be mounted. The heat sink has a relatively good heat radiating characteristic. A plurality of inner leads are provided, each having an inner end superimposed on the peripheral area of the heat sink by an insulating material. A semiconductor chip has a chip surface on which a junction pattern is arranged, and is mounted on the projected land of the heat sink by an insulating adhesive so that the chip surface faces the projected land. TAB leads are provided for electrically connecting the semiconductor chip to the inner leads, and a sealing resin hermetically seals at least the semiconductor chip.
摘要:
An interposer to be interposed between a semiconductor chip to be mounted thereon and a packaging board has an interposer portion made of a semiconductor and an interposer portion provided around the foregoing interposer portion integrally therewith. On both surfaces of the interposer portions, wiring patterns are formed via insulating layers. The wiring patterns are electrically connected via through holes formed at required positions in the interposer portions. The outer interposer portion is made of an insulator or a metal body. Further, external connection terminals are bonded to one surface of the interposer.
摘要:
In a method for manufacturing a lead frame, a predetermined pattern is formed on a matrix 10 by a resist, an electro-deposition portion is provided in a cavity formed in the resist patterns 12, and the electro-deposition pattern 13 is separated from the matrix 10. The resist pattern is formed on the matrix 10 so that a cavity portion 17 connecting a plurality of cavity 16 ends for inner lead formation can be included in the resist pattern, and an electro-deposition portion is provided into the cavity portion 17 so that the electro-deposition pattern 13 can be formed into a configuration in which the tip ends of the inner leads 22 are connected by a connecting piece 21, and the electro-deposition pattern 13 is separated from the matrix 10 while the tip ends of the inner leads 22 are connected by the connecting piece 21.
摘要:
A TAB tape or tape-like carrier used for an automatic bonding process when manufacturing high-frequency semiconductor devices has a plurality of electrically conductive circuit patterns on a flexible insulative film having a plurality of holes located in gaps between adjacent circuit patterns. A ground layer is formed on a back surface of the insulative film, and electrically conductive layers or material are formed on inner peripherals walls of the holes or filled in the holes, so that the ground layer is electrically connected to the respective condcutive layers or material.
摘要:
A circuit board has plated through holes which are laid out with a fine pitch and meets requirements relating to characteristics such as the thermal expansion coefficient of the circuit board. A method of manufacturing a circuit board includes: a step of forming a core portion by thermal compression bonding prepregs which include first fibers that conduct electricity and second fibers that do not conduct electricity, which have the second fibers disposed at positions where plated through holes will pass through, and which are impregnated with resin; a step of forming through holes at positions in the core portion where the second fibers are disposed; and a step of forming a conductive layer on inner surfaces of the through holes to form plated through holes at positions that do not interfere with the first fibers and thereby produce a core substrate.
摘要:
There is provided a wiring substrate. The wiring substrate includes: a core substrate formed of a conductive material and having a through hole therein; an insulating layer formed on first and second surfaces of the core substrate; wiring patterns formed on the first and second surfaces via the insulating layer; and a via formed in the through hole and electrically connected to the wiring patterns. The via includes: a conductor ball and a conductor portion. The conductor ball has a conductive surface and an insulating member covering the conductive surface. A portion of the conductive surface is exposed from the insulating member. The conductor portion is electrically connected to the exposed conductive surface and the wiring patterns. At least one of the insulating member and the insulating layer is interposed between the via and the core substrate.
摘要:
An interposer to be interposed between a semiconductor chip to be mounted thereon and a packaging board has an interposer portion made of a semiconductor material and an interposer portion provided around the foregoing interposer portion integrally therewith. On both surfaces of the interposer portions, wiring patterns are formed via insulating layers. The wiring patterns are electrically connected via through holes formed at required positions in the interposer portions. The outer interposer portion is made of an insulator or a metal body. Further, external connection terminals are bonded to one surface of the interposer.
摘要:
As means for solving a problem of a positional shift of a land and a hole which is caused by an alignment in the formation of an etching resist layer and a plated resist layer in a method of manufacturing a circuit board, there are provided a method of manufacturing a circuit board including the steps of forming a first resin layer on a surface of an insulating substrate having a conductive layer on the surface and an internal wall of a through hole or/and a non-through hole, forming a second resin layer which is insoluble or slightly soluble in a developing solution for the first resin layer on the first resin layer provided on the surface conductive layer, and removing the first resin layer provided over the hole with the developing solution for the first resin layer, and a method of manufacturing a circuit board including the step of uniformly charging a surface of the first resin layer to induce a potential difference to the first resin layer provided over the hole and the first resin layer provided on the surface conductive layer before forming the second resin layer. Moreover, there is provided a circuit board having a hole with a small positional shift and high precision.
摘要:
A process for making a circuit board comprises the following steps of: half-etching a metal layer formed on an insulating substrate by means of a first masking which is positioned on an upper surface of the metal layer; applying a positive liquid resist on the half-etched metal layer from an upper side of the first masking; exposing the positive liquid resist with parallel light from the upper side of the first masking and developing the positive liquid resist in such a manner that a part of the positive liquid resist located under the first masking is protected to be unexposed and undeveloped; etching again the metal layer by means of a second masking composed of the first masking and the protected positive liquid resist to form a conductive pattern on the insulating substrate; and removing the first masking and the second masking from the metal layer.
摘要:
There is provided a wiring substrate. The wiring substrate includes: a core substrate formed of a conductive material and having a through hole therein; an insulating layer formed on first and second surfaces of the core substrate; wiring patterns formed on the first and second surfaces via the insulating layer; and a via formed in the through hole and electrically connected to the wiring patterns. The via includes: a conductor ball and a conductor portion. The conductor ball has a conductive surface and an insulating member covering the conductive surface. A portion of the conductive surface is exposed from the insulating member. The conductor portion is electrically connected to the exposed conductive surface and the wiring patterns. At least one of the insulating member and the insulating layer is interposed between the via and the core substrate.