EP0200670A2
Expired / Lapsed
EP
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Decoupling capacitor and method of formation thereof
Assignee: Rogers Corp
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Filing: 1986-05-02
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Granted: —
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Expires: 2006-05-02
Abstract
Abstract A decoupling capacitor and method of forming the same, and a novel multilayer ceramic capacitor chip construction is presented. In the method, a conductor (14) having a lead (18) connected thereto is formed from a continuous strip of electrically conductive material (10), the strip having opposing planar surfaces. A dummy lead (20), associated with the conductor (14), but isolated therefrom, is also formed from the strip (10). Two such strips (10,10') (lead frames) are then spaced apart in a parallel orientation and a strip of insulating material (28) having a plurality of openings or windows (34) therein is sandwiched betwen the two lead frames (10, 10'), A novel multi-layer ceramic capacitor chip (38) having conductive electrodes (46', 44') on the top and bottom surfaces thereof is inserted into each window (34) so that the top and bottom electrodes (46', 44') respectively contact a conductor from each lead frame. Preferably, conductive epoxy is used to effect an electrical and mechanical connection between the capacitor chip electrodes and the lead frame conductors (14, 14'). Thereafter, a top strip (30) of outer insulating material is positioned across from one opposing surface of a first conductive strip (10) and a bottom strip (32) of outer insulating material is positioned on another opposing surface of a second conductive strip (10'). The top and bottom outer insulating layers (30, 32) sandwiching the pair of parallel conductive strips (19, 10') are then heat tacked and hot press laminated to form a continuous strip of laminated material. Finally, the now sealed and laminated decoupling capacitor is severed from the pair of lead frames. The decoupling capacitor of the present invention will thus be both hermetically sealed and automatically insertable for use in conjunction with integrated circuit DIP inserter devices.
Inventors
- 👤 Jorge M. Hernandez
- 👤 Rodney W. Larson
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 05:17
CPC Classifications
H; H01; H01G; H01G4/00; H01G4/002; H01G4/228; H01G2/00; H01G2/02; H01G2/06; H05; H05K; H05K1/00; H05K1/18
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
285 words
- A method of making a capacitor, including the steps of : removing unwanted material from a first strip of electrically conductive material to define a first conductor having a first active lead connected thereto and a first dummy lead associated with said first conductor, but electrically isolated therefrom; removing unwanted material from a second strip of electrically conductive material to define a second conductor having a second active lead connected thereto and a second dummy lead associated with said second conductor, but electrically isolated therefrom, said first and second conductive strips being spaced apart and parallel with said first and second conductors in alignment with one another; placing a central strip of electrically insulative material between said first and second conductors, said central insulative strip having windows therethrough wherein each of said windows define a recess which provides access between said first and second conductors; placing at least one multilayer capacitor element in said recess and between said first and second conductors, said capacitor element having opposed first and second conductive top and bottom surfaces, with said top conductive surface being in electrical contact with said first conductor and said bottom conductive surface being in electrical contact with said second conductor; placing a first outer strip of electrically insulative material on said first conductors opposite said central insulative strip; placing a second outer strip of electrically insulative material on said second conductors opposite said central insulative strip; providing adhesive between said first and second conductors, first and second outer insulative strips and central insulative strip; and bonding the above elements to form a laminated assembly with said first and second conductors, first and second outer insulative strips and central insulative strip being bonded together.
Claim 2
Dependent Claim
285 words
- A method of making a capacitor, including the steps of : removing unwanted material from a first strip of electrically conductive material to define a first conductor having a first active lead connected thereto and a first dummy lead associated with said first conductor, but electrically isolated therefrom; removing unwanted material from a second strip of electrically conductive material to define a second conductor having a second active lead connected thereto and a second dummy lead associated with said second conductor, but electrically isolated therefrom, said first and second conductive strips being spaced apart and parallel with said first and second conductors in alignment with one another; placing a central strip of electrically insulative material between said first and second conductors, said central insulative strip having windows therethrough wherein each of said windows define a recess which provides access between said first and second conductors; placing at least one multilayer capacitor element in said recess and between said first and second conductors, said capacitor element having opposed first and second conductive top and bottom surfaces, with said top conductive surface being in electrical contact with said first conductor and said bottom conductive surface being in electrical contact with said second conductor; placing a first outer strip of electrically insulative material on said first conductors opposite said central insulative strip; placing a second outer strip of electrically insulative material on said second conductors opposite said central insulative strip; providing adhesive between said first and second conductors, first and second outer insulative strips and central insulative strip; and bonding the above elements to form a laminated assembly with said first and second conductors, first and second outer insulative strips and central insulative strip being bonded together.
Claim 3
Dependent Claim
33 words
- A method as claimed in Claim 1, including providing electrically conductive adhesive between said capacitor element top conductor and said first conductor and said capacitor element bottom conductor and said second conductor.
Claim 4
Dependent Claim
47 words
- A method as claimed in Claim 1, wherein said step of removing unwanted material from said first and second strips of electrically conductive material further includes the steps of : forming support structure for supporting said first and second conductive strips; and severing said support structure.
Claim 5
Dependent Claim
52 words
- A method as claimed in Claim 1, wherein said step of removing unwanted material from said electrically conductive material further includes the steps of forming support structure for supporting said first and second leads and said dummy leads in said respective first and second conductive strips; and severing said support structure.
Claim 6
Dependent Claim
20 words
- A method as claimed in Claim 1, including : forming registration holes in said strips of electrically conductive material.
Claim 7
Dependent Claim
35 words
- A method as claimed in Claim 1, wherein : said active leads are at a first pair of diagonally opposed location and said dummy leads are at a second pair of diagonally opposed locations.
Claim 8
Dependent Claim
31 words
- A method as claimed in Claim 1, wherein : said capacitive element is a ceramic material having interleaved conductive layers with a pair of opposed conductive top and bottom surfaces.
Claim 9
Dependent Claim
20 words
- A method as claimed in Claim 1, including the step or : providing set-off means in said laminated assembly.
Claim 10
Dependent Claim
25 words
- A method as claimed in Claim l, including the further step of : severing said laminated assembly from said first and second conductive strips.
Claim 11
Dependent Claim
37 words
- A method as claimed in Claim 2, wherein said electrically conductive adhesive is solder and including the step of : reflowing said solder after providing it between said capacitor element and said first and second conductors.
Claim 12
Dependent Claim
15 words
ll. - A method as claimed in Claim 1, wherein said windows are substantially rectangular.
Claim 13
Dependent Claim
27 words
- A method as claimed in Claim 1, wherein the bonding step comprises the steps of : heat tacking the elements, and hot press laminating the elements.
Claim 14
Dependent Claim
251 words
- A capacitor including : a first electrical conductor (14), a second electrical conductor (14') spaced from and in alignment with said first conductor (14), a first active lead (18) extending from said first conductor (14) at a first position, a second active lead (18') extending from said second conductor (14') at a second position, a first dummy lead (20) associated with said first conductor (14), but electrically isolated therefrom at a third position, a second dummy lead (20') associated with said second conductor (14'), but electrically isolated therefrom at a fourth position, a central strip (28) of electrically insulative material between said first and second conductors (14, 14'), said central insulative strip (28) having a window (34) therethrough wherein said window defines a recess (36) which provides access between said first and second conductors (14, 14'), at least one multilayer capacitive element (38) in said recess and between said first and second conductors (14, 14'), said capacitive element (38) having opposed first and second conductive top and bottom surfaces, with said top conductive surface being in electrical contact with said first conductor (14) and said bottom conductive surface being in electrical contact with said second conductor (14'), and a first outer strip (30) of electrically insulative material on said first conductor (14) opposite said central insulative strip (28), a second outer strip (32) of electrically insulative material on said second conductor (14') opposite said central insulative strip (28) wherein the above elements are bonded together to form a laminated assembly.
Claim 15
Dependent Claim
251 words
- A capacitor including : a first electrical conductor (14), a second electrical conductor (14') spaced from and in alignment with said first conductor (14), a first active lead (18) extending from said first conductor (14) at a first position, a second active lead (18') extending from said second conductor (14') at a second position, a first dummy lead (20) associated with said first conductor (14), but electrically isolated therefrom at a third position, a second dummy lead (20') associated with said second conductor (14'), but electrically isolated therefrom at a fourth position, a central strip (28) of electrically insulative material between said first and second conductors (14, 14'), said central insulative strip (28) having a window (34) therethrough wherein said window defines a recess (36) which provides access between said first and second conductors (14, 14'), at least one multilayer capacitive element (38) in said recess and between said first and second conductors (14, 14'), said capacitive element (38) having opposed first and second conductive top and bottom surfaces, with said top conductive surface being in electrical contact with said first conductor (14) and said bottom conductive surface being in electrical contact with said second conductor (14'), and a first outer strip (30) of electrically insulative material on said first conductor (14) opposite said central insulative strip (28), a second outer strip (32) of electrically insulative material on said second conductor (14') opposite said central insulative strip (28) wherein the above elements are bonded together to form a laminated assembly.
Claim 16
Dependent Claim
17 words
- A capacitor as claimed in Claim 1, wherein said elements are bonded together with an adhesive.
Claim 17
Dependent Claim
31 words
- A capacitor as claimed in Claim 13, wherein said top and bottom conductive surfaces of said capacitive element (38) are bonded to said first and second conductors (14, 14') respectively.
Claim 18
Dependent Claim
17 words
- A capacitor as claimed in Claim 15, wherein said bonding is accomplished by a conductive adhesive.
Claim 19
Dependent Claim
38 words
- A capacitor as claimed in Claim 13, wherein said active leads (18, 18') are at a first pair of diagonally opposed locations and said dummy leads (20, 20') are at a second pair of diagonally opposed locations.
Claim 20
Dependent Claim
63 words
- A capacitor as claimed in Claim 13, wherein : ; said capacitive element (38) is a ceramic material having a pair of opposed end surfaces and top and bottom surfaces (46, 44), said capacitive element also having interleaved conductive layers (42) with a pair of opposed conductive top and bottom surfaces on said respective top and bottom surfaces of said ceramic materiai.
Claim 21
Dependent Claim
69 words
- A capacitor as claimed in Claim 18, including : first and second conductive and terminations (64, 66) on said ceramic material end surfaces; and wherein alternating layers of said interleaved conductive layers (42) terminate at said first and second conductive end terminations (64, 66) with said top and bottom conductive surfaces (46, 44) being connected and substantially transverse to respective first and second conductive end terminations (64, 66).
Claim 22
Dependent Claim
68 words
- A capacitor as claimed in Claim 22, including : an electrically insulative cap (60, 62) being provided over each of said first and second conductive end terminations (64, 66) wherein said conductive end terminations (64, 66) are encapsulated and wherein electrical bridging between said top and bottom conductive surfaces (44, 46) and said first and second conductive end terminations (64, 66) is precluded by said insulative caps.
Claim 23
Dependent Claim
27 words
- A capacitor as claimed in Claim 23, wherein : said cap (60, 62) is comprised of a material selected from the group comprising glass and epoxy.
Claim 24
Dependent Claim
16 words
- A capacitor as claimed in Claim 13, including : set-off means in said laminated cover.
Claim 25
Dependent Claim
16 words
- A capacitor as claimed in Claim 13, wherein : said windows (34) are substantially rectangular.
Claim 26
Dependent Claim
43 words
- An array of capacitors positioned between a pair of edge strips from which a pair of conductors and active and dummy leads of the capacitors are formed, each of said capacitors being in accordance with any one of Claims 13 to 23.
Claim 27
Dependent Claim
172 words
- A multilayer capacitor element comprising : ceramic material (40') having a pair of opposed end surfaces and having top and bottom surfaces; a plurality of parallel conductive layers (42') interleaved within said ceramic material with a first conductive layer (46') on said top surface of said ceramic material (40') and a second conductive layer (44 1 ) on said bottom surface of said ceramic material; a first conductive end termination (66) on one of said opposed end surfaces of said ceramic material (40') and a second conductive end termination (64) on the other of said opposed end surfaces of said ceramic material (40') , alternating layers of said interleaved conductive layers (42') terminating at said first and second conductive end terminations (66, 64) with said top and bottom conductive surfaces (46', 44') being connected and substantially transverse to respective first and second conductive end terminations (66, 64) whereby a gap is defined between each of said end terminations (66, 64) and one of said first or second conductive layers (46', 44').
Claim 28
Dependent Claim
172 words
- A multilayer capacitor element comprising : ceramic material (40') having a pair of opposed end surfaces and having top and bottom surfaces; a plurality of parallel conductive layers (42') interleaved within said ceramic material with a first conductive layer (46') on said top surface of said ceramic material (40') and a second conductive layer (44 1 ) on said bottom surface of said ceramic material; a first conductive end termination (66) on one of said opposed end surfaces of said ceramic material (40') and a second conductive end termination (64) on the other of said opposed end surfaces of said ceramic material (40') , alternating layers of said interleaved conductive layers (42') terminating at said first and second conductive end terminations (66, 64) with said top and bottom conductive surfaces (46', 44') being connected and substantially transverse to respective first and second conductive end terminations (66, 64) whereby a gap is defined between each of said end terminations (66, 64) and one of said first or second conductive layers (46', 44').
Claim 29
Dependent Claim
67 words
- A capacitor as claimed in Claim 35, including an electrically insulative cap (60, 62) being provided over each of said first and second conductive end terminations (66, 64) wherein said conductive end terminations (66, 64) are encapsulated and wherein electrical bridging between said top and bottom conductive surface and said first and second conductive end terminations (66, 64) is precluded by said insulative caps (60, 62)
Claim 30
Dependent Claim
28 words
- A capacitor as claimed in Claim 36, wherein : said insulative cap (60, 62) is comprised of a material selected from the group comprising glass and epoxy.
References Cited (Backward Citations)
No citation records indexed.
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