Portable semiconductor device with resin

• US 5,461,256 A
• Filed: 11/03/1993
• Issued: 10/24/1995
• Est. Priority Date: 11/06/1992
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Kurisu, Tsuguo, Kobayashi, Makoto, Yamada, Akira, Baba, Fumiaki, Kodai, Syojiro
• Primary Examiner(s): Mintel, William
• Assistant Examiner(s): POTTER, ROY KARL
• Application Number:
  US08/145,224
• Time in Patent Office: 720 Days
• Field of Search: 257/679, 257/687, 257/723, 156/244.12, 361/737, 361/728
• US Class Current: 257/679
• CPC Class Codes: G06K 19/07745 Mounting details of integrated circuit chips
• CPC Class Codes: H01L 2924/00 Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
• CPC Class Codes: H01L 2924/0002 Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
• CPC Class Codes: H05K 3/284 for encapsulating mounted components H05K1/185 takes precedence

Abstract

At least one part of a two-part container of a portable semiconductor device has an electronic part accommodating portion, a foamed resin accommodating portion provided at a peripheral edge portion of the container for accommodating an excess of foamed resin, and a coupling groove for coupling the electronic part accommodating portion to the foamed resin accommodating portion. Since the electronic parts and a circuit board are completely embedded in the device, a semiconductor device exhibiting excellent resistance to environment can be manufactured by a simple process.

Claims

1. A portable semiconductor device comprising:

a two-part container serving as an outer skin;

a circuit board on which electronic parts are mounted, said circuit board being accommodated in said container; and

a foamed resin filled in a gap between said container and said circuit board,

wherein at least one part of said two-part container has a recessed electronic part accommodating portion in which the electronic parts mounted on said circuit board are accommodated and in which said foamed resin is charged, a foamed resin accommodating portion provided at a peripheral edge portion of said container to accommodate an excess of foamed resin, and being partitioned from said electronic part accommodating portion by a rib, and a coupling groove extending through said rib for coupling said electronic part accommodating portion to said foamed resin accommodating portion.

2. A portable semiconductor device according to claim 1 wherein said foamed resin accommodating portion comprises a plurality of ring-shaped grooves.

3. A portable semiconductor device according to claim 1 wherein said foamed resin accommodating portion comprises a plurality of L-shaped grooves.

4. A portable semiconductor device according to claim 1, wherein said foamed resin accommodating portion further comprises at least one division disposed therein to create at least two separate reservoirs each of which is coupled to said electronic part accomodating portion via an associated coupling groove.

5. The portable semiconductor device of claim 1, wherein said foamed resin has a modulus of elasticity of about 60 kg/mm².

6. A portable semiconductor device comprising:

a container serving as an outer skin, said container including a frame serving as an outer edge portion, and a surface sheet material adhered to each of two surfaces of said frame;

a circuit board on which electronic parts are mounted, said circuit board being accommodated in said container; and

a foamed resin filling a gap between said container and said circuit board,

wherein a rib is formed integrally with said frame on an inner side of said frame, whereby an electronic part accommodating portion in which said electronic parts on said circuit board are mounted and in which said foamed resin is charged is formed on an inner side of said rib and whereby a foamed resin accommodating portion for accommodating an excess of the foamed resin in said electronic part accommodating portion is formed between said rib and said a peripheral edge portion of said frame, and wherein a coupling groove for coupling said electronic part accommodating portion to said foamed resin accommodating portion is provided.

7. A portable semiconductor device according to claim 6 wherein said foamed resin accommodating portion comprises a plurality of ring-shaped grooves.

8. A portable semiconductor device according to claim 6 wherein said foamed resin accommodating portion comprises a plurality of L-shaped grooves.

9. A portable semiconductor device according to claim 6, wherein said foamed resin accommodating portion further comprises at least one division disposed therein to create at least two separate reservoirs each of which is coupled to said electronic part accomodating portion via an associated coupling groove.

10. A portable semiconductor device according to claim 9, wherein the at least one division of the foamed resin accommodating portion directs the excess foamed resin to those of said at least two reservoirs of the foamed resin accommodating portion that are unfilled.

11. A portable semiconductor device according to claim 6, further comprising means for directing said excess foamed resin evenly throughout the foamed resin accommodating portion via a plurality of coupling grooves.

12. A semiconductor device comprising:

a container serving as an outer shell;

a circuit board on which electronic parts are mounted, said circuit board being disposed in said container; and

a foamed resin which fills a gap between said container and said circuit board,

wherein said container has an electronic part accommodating portion to accommodate said circuit board, a resin accommodating portion disposed along a perimeter of said container to accommodate an excess of foamed resin, said resin accommodating portion being partitioned from said electronic part accommodating portion by a rib, and a coupling groove extending through said rib to couple said electronic part accommodating portion to said resin accommodating portion.

13. A semiconductor device according to claim 12, wherein said resin accommodating portion further comprises at least one division disposed therein to create at least two separate reservoirs each of which is coupled to said electronic part accommodating portion via an associated coupling groove.

14. A semiconductor device according to claim 13, wherein the at least one division of the resin accommodating portion directs the excess foamed resin to those of said at least two reservoirs of the resin accommodating portion that are unfilled.

15. A semiconductor device according to claim 13, wherein the resin accommodating portion is provided along each of two sides of the electronic part accommodating portion.

16. A semiconductor device according to claim 12, further comprising means for directing said excess foamed resin evenly throughout the resin accommodating portion via a plurality of coupling grooves.

17. A semiconductor device according to claim 12, wherein said resin accommodating portion comprises a plurality of ring-shaped grooves.

18. A semiconductor device according to claim 12, wherein said resin accommodating portion comprises a plurality of L-shaped grooves.

19. A semiconductor device according to claim 12, wherein said container further comprises:

a frame serving as an outer edge portion; and

a surface sheet material adhered to each of two surfaces of said frame.

20. A semiconductor device according to claim 12, wherein said container further comprises an upper casing portion and a lower casing portion.

21. A semiconductor device according to claim 12, wherein said foamed resin expands in volume to fill said electronic part accommodating portion and said resin accommodating portion.

22. A semiconductor device according to claim 12, wherein the resin accommodating portion is provided along one side of the electronic part accommodating portion.

23. An integrated circuit card comprising:

a container serving as an outer shell of the integrated circuit card;

a circuit board disposed in said container; and

a resin which fills a gap between said container and said circuit board,

wherein said container has an electronic part accommodating portion to accommodate said circuit board, a resin accommodating portion disposed along a peripheral edge of said container to accommodate an excess of resin, said resin accommodating portion being partitioned from said electronic part accommodating portion by a rib, and a coupling groove extending through said rib to couple said electronic part accommodating portion to said resin accommodating portion.

24. The integrated circuit card of claim 23, wherein said resin accommodating portion comprises a plurality of ring-shaped grooves.

25. The integrated circuit card of claim 23, wherein said resin accommodating portion comprises a plurality of L-shaped grooves.

26. The integrated circuit card of claim 23, wherein said resin accommodating portion further comprises at least one division disposed therein to create at least two separate reservoirs each of which is coupled to said electronic part accommodating portion via an associated coupling groove.

27. The integrated circuit card of claim 23, wherein said resin comprises a foamed resin which expands in volume to fill said electronic part accommodating portion and said resin accommodating portion.