Source: https://patents.google.com/patent/US6208521
Timestamp: 2018-03-19 23:56:35
Document Index: 448702366

Matched Legal Cases: ['art 7', 'art 3', 'art 3', 'art 3', 'art 3', 'art.\n10']

US6208521B1 - Film carrier and laminate type mounting structure using same - Google Patents
US6208521B1
US6208521B1 US09080454 US8045498A US6208521B1 US 6208521 B1 US6208521 B1 US 6208521B1 US 09080454 US09080454 US 09080454 US 8045498 A US8045498 A US 8045498A US 6208521 B1 US6208521 B1 US 6208521B1
US09080454
FIG. 12 is a graph showing the heat releasability of the laminate type mounting structures manufactured in an Example and a Comparative Example, in relation to air flow rate [m/s] and thermal resistance [° C./W].
Of the connected film carrier members 1 a-1 c, one film carrier member 1 a is a base member 1 a. The base member 1 a is the same as other film carrier members in that one surface of the insulating substrate 5 is a mounting plane 2 for mounting a semiconductor element. However, it is different in that the other surface of the insulating substrate 5 is a connection plane for an external circuit board. The connection plane of the base member has a connection part 7 to be connected with an external circuit board, and the point 7 is electrically continuous with the conductive circuit 4 a.
The film carrier members 1 b and 1 c other than base member 1 a are laminated by bending the film carrier at the folding part 3, or the entire film carrier is bent such that the folding line comes to the folding part. In this way, they are layered on the base member 1 a to form a laminate structure as a whole. The internal conductive circuits 4 b and 4 c in these film carrier members 1 b and 1 c are respectively connected to the conductive circuits 4 a in the base member through the inside of the folding part 3.
In the embodiment shown in FIG. 2, five film carrier members are connected in the extending directions of the planes to form a simple cross. In this embodiment, the film carrier member at the center of the cross is the base member. The film carrier members have the same outer shape. The outer four film carrier members are connected in such a manner that one film carrier member is connected, via folding part 3, to each of the four sides of the base member 1 a. Thus, the outer shape coincides when laminated on the central base member and a cross is formed about the base member 1 a.
The embodiments shown in FIGS. 1 and 2 exemplify linear and cross shapes about the base member. The film carrier member 1 b can be connected to any of the four sides of the base member 1 a in any manner, and a different film carrier member may be connected to the film carrier member 1 b and extended further.
FIG. 4(b) shows the laminate type mounting structure of FIG. 4(a) except that the film carrier is folded at the folding part 3. The inventive laminate type mounting structure 10 comprises the semiconductor element shown in FIG. 4(a) and film carrier members 1 b and 1 c successively laminated on the base member 1 a, with the connection plane of the base member 1 a as the lowermost plane of the laminate. In the embodiment of FIG. 4(b), film carrier members 1 b and 1 c other than the base member 1 a are superimposed on the mounting plane 2 facing the base member 1 a.
The way to fold the film carrier carrying semiconductor elements is not limited. In the case where the film carrier members are linearly connected, for example, when the mounting planes are on the same side, they may be folded to depict the shape of a ‘6’ (roll shape, embodiment of FIG. 4(b)). When the mounting planes are on different sides, they may be folded to depict the shape of an ‘S’ (basically zigzag). In addition, they may be combined in an infinite number of modes, such as connecting the film carrier members to form a cross, extensive connection from a cross and the like. The mode of folding can be optionally determined according to the intended use.
When a laminate type mounting structure as shown in FIG. 4 is to be manufactured, the laminated layers may be further connected to each other. In the embodiment of FIG. 5, a semiconductor element 8 a mounted on the base member 1 a and a semiconductor element 8 b mounted on the next film carrier member 1 b are bonded, via an adhesive layer 14 a, to the laminate type mounting structure 10 shown in FIG. 4. The semiconductor element 8 c mounted on the film carrier member 1 c is bonded via an adhesive layer 14 a to the insulating substrate on the lower side of the film carrier member 1 b.
The adhesive to be used between layers, an adhesive used for mounting a semiconductor element by wire bonding, and an adhesive to be filled in the gap between the semiconductor element mounted and film carrier member may be a known adhesives used for typical semiconductor-mounting products.
Three film carrier members were connected linearly as shown in FIG. 1, wherein the central film carrier member was the base member. The size of each film carrier member was 10 mm length×10 mm width, the size of two folding parts were each 3 mm length×10 mm width and 5 mm length×10 mm width, and the size of the entire insulating substrate was length 38 mm×10 mm width. The insulating substrate was made from a polyimide resin and had a thickness of 0.1 mm. A copper conductive circuit was formed on the insulating substrate and a coating layer made from the same material as the insulating substrate was formed to give a structure wherein the conductive circuit was embedded in the insulating substrate. Then, using one surface of the insulating substrate as a mounting plane, a bump contact was formed as a mounting connection part on the insulating substrate in the area to be the film carrier member. In addition, a bump contact was formed in the connection part on the connection plane of a base member for the connection with an external circuit board, whereby the inventive film carrier was obtained.
An IC bare chip having an outer size of 7 mm×7 mm was mounted as a semiconductor element on a mounting plane of each film carrier member of the film carrier prepared above. The mounting plane and the semiconductor element were adhered with a thermosetting adhesive.
An IC bare chip having an outer size of 7 mm×7 mm was mounted, using an adhesive, as a semiconductor element mounted on a mounting plane of each film carrier member of the film carrier prepared above. Wire bonding using a gold wire W for internal connection completed the mounting.
To a copper plate having a width (size in the direction of length of the inventive film carrier) of 8 mm and a thickness of 0.5 mm was applied, in the entirety thereof, nickel electroplating in a thickness of 1.0 μm to form a plate for heat-releasing structure. Using two plates, two members for the channel-shaped heat-releasing structure were prepared by folding the plate. Each of the members comprised a part to be a heat-absorbing plate (outer shape 8 mm×8 mm), a part to be a heat-releasing plate (outer shape 8 mm×8 mm) and a connection part to connect them. The length of the connection part was determined to secure the distance (0.5 mm) between the uppermost surface and the heat-releasing plate, as well as the distance (0.5 mm) between two heat-releasing plates. These distances were determined in consideration of the distance between the uppermost surface and interlayer of the laminate type mounting structure.
In the same manner as in Example 3 except that a heat-releasing plate was corrugated, the laminate type mounting structure of the present invention was prepared. The wave formed an approximate sine curve of oscillation width 0.5 mm×pitch (length of one cycle) 1.0 mm.
(a) increase in air temperature: ΔTa=50° C.
The test results are shown in FIG. 12 in a graph showing the relation of air flow rate (m/s) and heat resistance (° C./W).
heat-releasing heat-releasing
sealing structure plate
Example 3 — present flat plate
Example 4 sealed present flat plate
Example 5 — present corrugated plate
Example 6 sealed present corrugated plate
Comparative Example 1 — — —
Comparative Example 2 sealed — —
The results are shown in the graph of FIG. 12. Comparison of the sets of Example 3 and Example 4, Example 5 and Example 6, and Comparative Example 1 and Comparative Example 2 obviously reveals that the heat resistanceΘja of the laminate type mounting structure improved by about 10° C./W in the naked mode in the absence of wind without resin sealing relative to that with resin sealing. Thus, when heat resistance may pose problems, the use of a naked semiconductor element to prepare a laminate type mounting structure would be more beneficial.
The results are shown in the graph of FIG. 12. Comparison of Example 3 and Comparative Example 1 obviously reveals that the heat resistanceΘja of the laminate type mounting structure improved from 60° C./W to 30° C./W in the absence of wind. Comparison of Example 4 and Comparative Example 2 obviously reveals that the heat resistanceΘja of the laminate type mounting structure improved from 50° C./W to 20° C./W in the absence of wind, thus demonstrating a drastic improvement of about 30° C./W.
The results are shown in the graph of FIG. 12. Comparison of Example 3 and Example 5, and Example 4 and Example 6 obviously reveals that the heat resistanceΘja of the laminate type mounting structure improved by about 10° C./W when the heat-releasing plate was corrugated rather than a flat plate.
1. A film carrier comprising a plurality of generally planar film carrier members that are connected, via folding parts, in the direction of an extension of each plane, wherein one of said film carrier members is a base member and the film carrier members other than the base member are laminated on the base member upon folding the film carrier at the folding parts to form a single laminate structure as a whole, said film carrier members having conductive circuits connected to a conductive circuit in the base member through inside portions of the folding parts, said base member having a mounting plane and a connection plane on the rear surface thereof, and said connection plane having a connection part which is used for connection with an external substrate and which is electrically continuous with the conductive circuit;
wherein each of said film carrier members comprises a conductive circuit formed in an insulating substrate, at least one surface of the insulating substrate being a mounting plane on which to mount a semiconductor element, and the mounting plane having a mounting connection part being electrically continuous with the conductive circuit; and
wherein each of the film carrier members is shaped as a square, and the film carrier members other than the base member are respectively connected to four sides of the base member.
2. The film carrier claim 1, wherein the mounting connection part of each of the film carrier members comprises a conductive circuit exposed inside an opening formed in the mounting plane.
wherein the mounting connection part of each of the film carrier members comprises a conductive circuit exposed inside an opening formed in the mounting plane.
5. The film carrier of claim 4, wherein the shape of said opening is such that said opening is capable of receiving a semiconductor element to be mounted, and the conductive circuit exposed inside the opening is placed at a position where a direct connection with an electrode of the semiconductor element can be established.
wherein the connection part for connection to the external substrate comprises a conductive circuit exposed inside an opening formed in the connection plane.
8. The film carrier of calm 7, wherein the mounting connection part of each of the film carrier member comprises a conductive circuit exposed inside an opening formed in the mounting plane.
wherein each of said film carrier members comprises a conductive circuit formed in an insulating substrate, at least one surface of the insulating substrate being a mounting plane on which to mount a semiconductor element, and the mounting plane having a mounting connection part being electrically continuous with the conductive circuit;
wherein semiconductor elements are mounted on the mounting planes of a plurality of the film carrier members, the film carrier being folded at the folding parts, thereby laminating the film carrier members other than the base member on the base member, so that the connection plane of the base member is the lowermost plane of the laminate structure, thus forming a single laminate structure as a whole;
wherein the heat-absorbing plate and the heat-releasing plate are made from a heat conductive plate comprising a part to be the heat-absorbing plate, a part to be the heat-releasing plate and a plate connection part to connect said two plates; and
wherein the heat-absorbing plate and the heat-releasing plate are formed in the same number and the heat conductive plate is folded in a channel shape comprising a part to be the heat-absorbing plate, a part to be the heat-releasing plate and the plate connection part.
10. The laminate type mounting structure of claim 9, wherein the film carrier member other than the base member are laminated on one another with mounting planes thereof facing the base member.
wherein the film carrier is formed by linearly connecting the film carrier members, and the direction from each film carrier member toward the adjacent folding part and the direction from the heat-absorbing plate toward the plate connection part are orthogonal to each other.
13. The laminate type mounting structure of claim 12, wherein the film carrier members other than the base member are laminated on one another with mounting planes thereof facing the base member.
wherein each of the film carrier members is shaped as a square, and the film carrier members other than the base member are respectively connected to four sides of the base member; and
wherein semiconductor elements are mounted on the mounting planes of a plurality of the film carrier members, the film carrier being folded at the folding parts, thereby laminating the film carrier members other than the base member on the base member, so that the connection plane of the base member is the lowermost plane of the laminate structure, thus forming a single laminate structure as a whole.
16. The laminate type mounting structure of claim 15, wherein the film carrier members other than the base member are laminated on one another with mounting planes thereof facing the base member.
wherein the mounting connection part of each of the film carrier members comprises a conductive circuit exposed inside an opening formed in the mounting planes; and
20. The laminate type mounting structure of claim 19, wherein the film carrier members other than the base member are laminated on one another with mounting planes thereof facing the base member.
wherein the mounting connection part of each of the film carrier members comprises a conductive circuit exposed inside an opening formed in the mounting plane;
wherein the shape of said opening is such that said opening is capable of receiving a semiconductor element to be mounted, and the conductive circuit exposed inside the opening is placed at a position where a direct connection with an electrode of the semiconductor element can be established; and
24. The laminate type mounting structure of claim 23, wherein the film carrier members other than the base member are laminated on one another with mounting planes thereof facing the base member.
wherein the connection part for connection to the external substrate comprises a conductive circuit exposed inside an opening formed in the connection plane; and
28. The laminate type mounting structure of claim 27, wherein the film carrier members other than the base member are laminated on one another with mounting planes thereof facing the base member.
US09080454 1997-05-19 1998-05-19 Film carrier and laminate type mounting structure using same Active US6208521B1 (en)
JP12840697 1997-05-19
JP9-128406 1997-05-19
JP29758197A JP3611957B2 (en) 1997-10-29 1997-10-29 Laminate type mounting body
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JP29747697A JP3490601B2 (en) 1997-05-19 1997-10-29 Film carrier and stacked mounting structure using the same
US6208521B1 true US6208521B1 (en) 2001-03-27
ID=27315740
US09080454 Active US6208521B1 (en) 1997-05-19 1998-05-19 Film carrier and laminate type mounting structure using same
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