Container for electronic devices having a plurality of circuit boards

• US 5,408,383 A
• Filed: 09/10/1993
• Issued: 04/18/1995
• Est. Priority Date: 05/31/1991
• Status: Expired due to Term

• Current Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Original Assignee: Nippondenso Co., Ltd. (DENSO Corporation)
• Inventors: Katsuyama, Hidekazu, Maeda, Yukihiro, Koyama, Makoto, Nagasaka, Takashi, Motoyama, Yuji, Urushizaki, Mamoru, Hirao, Yasunobu
• Primary Examiner(s): Thompson, Gregory D.
• Application Number:
  US08/118,785
• Time in Patent Office: 585 Days
• Field of Search: 361/383, 361/386-389, 361/394-395, 361/399, 361/401, 361/404-406, 361/408, 361/421, 361/424, 361/429, 361/707, 361/715, 361/730, 361/752, 361/772
• US Class Current: 361/707
• CPC Class Codes: H01L 21/4842 Mechanical treatment, e.g. punching, cutting, deforming, cold welding
• CPC Class Codes: H01L 2224/45099 Material
• CPC Class Codes: H01L 2224/48091 Arched
• CPC Class Codes: H01L 2224/48227 connecting the wire to a bond pad of the item
• CPC Class Codes: H01L 23/49811 Additional leads joined to the metallisation on the insulating substrate, e.g. pins, bumps, wires, flat leads H01L23/49827 takes precedence
• CPC Class Codes: H01L 23/49861 Lead-frames fixed on or encapsulated in insulating substrates H01L23/4985, H01L23/49805 take precedence
• CPC Class Codes: H01L 24/48 of an individual wire connector
• CPC Class Codes: H01L 25/162 the devices being mounted on two or more different substrates
• CPC Class Codes: H01L 25/165 Containers
• 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 2924/00012 Relevant to the scope of the group, the symbol of which is combined with the symbol of this group
• CPC Class Codes: H01L 2924/00014 the subject-matter covered by the group, the symbol of which is combined with the symbol of this group, being disclosed without further technical details
• CPC Class Codes: H01L 2924/01039 Yttrium [Y]
• CPC Class Codes: H01L 2924/13091 Metal-Oxide-Semiconductor Field-Effect Transistor [MOSFET]
• CPC Class Codes: H01L 2924/14 Integrated circuits
• CPC Class Codes: H01L 2924/16195 Flat cap [not enclosing an internal cavity]
• CPC Class Codes: H01L 2924/1627 stacked type assemblies, e.g. stacked multi-cavities
• CPC Class Codes: H01L 2924/181 Encapsulation
• CPC Class Codes: H01L 2924/19041 being a capacitor
• CPC Class Codes: H01L 2924/3025 Electromagnetic shielding
• CPC Class Codes: H05K 1/144 : Stacked arrangements of planar printed circuit boards
• CPC Class Codes: H05K 5/0043 : comprising a frame housing mating with two lids wherein the PCB is flat mounted on the frame housing
• CPC Class Codes: H05K 5/0056 : characterized by features for protecting electronic components against vibration and moisture, e.g. potting, holders for relatively large capacitors
• CPC Class Codes: H05K 5/0069 : having connector relating features for connecting the connector pins with the PCB or for mounting the connector body with the housing
• CPC Class Codes: H05K 5/064 : sealed by potting, e.g. waterproof resin poured in a rigid casing

Abstract

In order to provide an electronic device that has high package density and can facilitate electrical connection between a plurality of circuit boards therein, the electronic device comprises a frame having two mutually opposed openings through major planes, a plurality of circuit boards disposed in the frame parallel to the major plane, and mounted selected electronic circuits thereon respectively, and first and second closure lids for closing the openings in the major plane; the first closure lid contacting with the surface of at least one of the circuit boards, on which no electronic circuit is mounted. Also, on the inner wall of the frame; appropriate stepped portions are formed for supporting the closure lid member, the supporting plate, the circuit board and so forth, Furthermore, in the stepped portion, a portion to accommodate an excess amount of an adhesive is provided.

Claims

1. A container for containing an electric device comprising:

a frame having a first opening and a second opening at two end surfaces thereof and opposing each other;

a metal bottom plate for closing said first opening;

a metal closure lid for closing said second opening;

whereby a closed space is formed by said frame, said metal bottom plate, and said metal closure lid and provided inside said container;

a first circuit means which is brought into contact with a surface of said metal bottom plate so that said metal bottom plate serves as a heat sink for said first circuit means;

a first electrode means provided to enable establishment of an electrical connection between said first circuit means and external portions of said container, said electrical connection being inside said closed space; and

a metal reinforcing plate provided inside said closed space and between said metal bottom plate and said metal closure lid, and bridging between at least two mutually opposing inner surfaces of said frame at a position formed between said first circuit means and said metal closure lid.

2. A container for containing an electric device according to claim 1, wherein said container is further provided with a second circuit means in contact with a surface of said metal reinforcing plate so as to be supported by said metal reinforcing plate.

3. A container for containing an electric device according to claim 1, wherein a substrate of said first circuit means comprises said metal bottom plate.

4. A container for containing an electric device according to claim 1, wherein said metal bottom plate, said metal closure lid, and said metal reinforcing plate are made of an identical metallic material.

5. A container for containing an electric device according to claim 2, wherein an amount of heat generated by said second circuit means is less than an amount of heat generated by said first circuit means.

6. A container for containing an electric device according to claim 2, wherein said second circuit means is disposed on a surface of said metal reinforcing plate, which opposes said metal closure lid.

7. A container for containing an electric device according to claim 6, wherein said first and second circuit means are coated by a gel form coating agent.

8. A container for containing an electric device according to claim 6, wherein a plurality of stepwise portions for supporting said metal bottom plate, metal closure lid, and metal reinforcing plate, are disposed on an inside surface of said frame.

9. A container for containing an electric device according to claim 8, wherein each one of said stepwise portions includes:

a horizontal plane portion to which a peripheral portion of any one of said metal bottom plate, said metal closure lid, and said metal reinforcing plate is bonded with an adhesive; and

a vertical portion for determining mutual positions of said metal bottom plate, said metal closure lid, and said metal reinforcing plate in their arrangement.

10. A container for containing an electric device according to claim 9, wherein a groove is formed on said horizontal plane portion of said stepwise portion at a side adjoining said vertical portion of said stepwise portion.

11. A container for containing an electric device according to claim 9, wherein a cut-out portion is formed at an inner boundary of said bonded region formed on said horizontal plane portion to thereby store said adhesive in said cut-out portion.

12. A container for containing an electric device according to claim 9, wherein said frame has an inner wall formed in a stepwise configuration with a stepped portion having a horizontal plane portion supporting a peripheral portion of said metal bottom plate, said metal closure lid, and said metal reinforcing plate, and

wherein said horizontal plane portion is formed with a groove thereon at an inner boundary at a side of a closed space of said frame.

13. A container for containing an electric device according to claim 7, wherein a plurality of stepwise portions for supporting said metal bottom plate, said metal closure lid, and said metal reinforcing plate, are disposed on an interior surface of said frame.

14. A container for containing an electric device according to claim 13, wherein each of said stepwise portions includes:

a horizontal plane portion to which a peripheral portion of any one of said metal bottom plate, said metal closure lid, and said metal reinforcing plate is bonded with an adhesive; and

a vertical portion for determining mutual positions of said metal bottom plate, said metal closure lid, and said metal reinforcing plate, in their arrangement.

15. A container for containing an electric device according to claim 14, wherein a groove is formed on said horizontal plane portion of said stepwise portion at a side adjoining said vertical portion of said stepwise portion.

16. A container for containing an electric device according to claim 14, wherein a cut-out portion is formed at an inner boundary of said bonded region formed on said horizontal plane portion to thereby store said adhesive in said cut-out portion.

17. A container for containing an electric device according to claim 14, wherein said frame includes an inner wall formed in a stepwise configuration with a stepped portion having a horizontal plane portion supporting peripheral portion of said metal bottom plate, said metal closure lid, and said metal reinforcing plate;

and

wherein said horizontal plane is formed with a groove thereon at an inner boundary at a side of a closed space of said frame.

18. A container for containing an electric device according to claim 9, wherein said frame includes an inner wall formed into a stepwise configuration having horizontal planes in contact with a peripheral portion of a wired side of said circuit board and bonded with said circuit board by an adhesive;

and

a dummy wiring with a wiring pattern formed inside of said inner boundary while maintaining a small clearance therebetween.

19. A container for containing an electric device according to claim 18, wherein a cut-out portion is formed at an inner boundary of said horizontal plane of said stepwise portion.

20. A container for containing an electric device according to claim 6, wherein a second electrode means is provided for said second circuit means and said first electrode means and said second electrode means are disposed on a first side surface of said frame.

21. A container for containing an electric device according to claim 20, wherein an electrical connection connecting said first and second circuit means is provided on a second side surface of said frame.

22. A container as according to claim 21, further comprising:

a first lead pin and a second lead pin, both supported by said frame and, respectively having a multi-pin structure, extending through one side of a side wall of said frame from the inside to the outside and in electrical contact with the contacting portions of said first circuit means and second circuit means at the interior of said frame; and

a connecting portion for integrally connecting said multi-lead structure connection leads and said first contacting portion and second contacting portion, and including intermediate connecting members held in stepwise bent fashion on the side wall of said frame at a side opposite to said side where said first and second lead pins are disposed, a first contacting portion disposed at a first stepped portion of said intermediate connecting member formed in a stepwise fashion and electrically connected to the contacting portion of said first circuit means and a second contacting portion disposed at a second stepped portion of said intermediate connecting member and electrically connected to the contacting portion of said circuit means.

23. A container as set forth in claim 21, further comprising:

an intermediate connecting member held inside the side wall of said frame in a stepwise bent fashion;

a first contacting portion exposed to a horizontal plane of the stepped portion of said side wall of said frame formed into a stepwise configuration and in contact with the contacting portion of the said first circuit board; and

a second contacting portion exposed to a horizontal plane portion of the stepped portion of the side wall of said frame formed into a stepwise configuration, other than that exposing said first contacting portion, and in contact with the contacting portion of said second circuit means.

24. A container according to claim 23, wherein said connection lead has a tip end extending from said second contacting portion toward an interior side of said side wall of said frame in parallel relationship with a connecting portion extending between said first contact portion and said second contact portion.

25. A container according to claim 21, wherein said container includes intermediate connecting lead members connecting said first circuit means and said second circuit means at one inner side wall of said frame, and having a stepwise configuration which comprises a first lead portion forming a first horizontal plate portion, a second lead portion forming a second horizontal plane portion, and a first vertical portion disposed between said first lead portion and said second lead portion and being perpendicular to both lead portions, wherein said first and second lead portions are disposed in opposite directions to each other with respect to said first vertical portion, and said first lead portion serves as a bonding region to which said first circuit means is bonded and said second lead portion serves as a bonding region to which said second circuit means is bonded.

26. A container according to claim 25, wherein said intermediate connecting lead member is further provided with a second vertical portion separate from said first vertical portion and extending downwardly from a free end portion of said second lead portion wherein said second vertical portion serves as an anchor portion to be inserted into and fixed to an inside portion of said frame.