CA1089040A - Pleated metallized film capacitor with staggered edges - Google Patents
Pleated metallized film capacitor with staggered edgesInfo
- Publication number
- CA1089040A CA1089040A CA305,795A CA305795A CA1089040A CA 1089040 A CA1089040 A CA 1089040A CA 305795 A CA305795 A CA 305795A CA 1089040 A CA1089040 A CA 1089040A
- Authority
- CA
- Canada
- Prior art keywords
- capacitor segment
- capacitor
- layer
- segment
- dielectric layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/26—Folded capacitors
Abstract
PLEATED METALLIZED FILM CAPACITOR
WITH STAGGERED EDGES
Abstract of the Disclosure An electrical capacitor is formed utilizing a thin dielectric layer which is metallized on both sides to provide electrode areas. The capacitor is formed by pleating, or folding, the dielectric layer along its longitudinal dimension an odd number of times. The pleats are not creased but are allowed to form smoothly curved edges in which the radius of such bend is at least equal to the thickness of the film. In addition the edges of the pleats are progressively staggered so that the centers of the bend of one pleat edge is removed a distance of at least four film thicknesses from its neighboring centers. This configuration prevents the end of the capacitor from forming a "bar-bell" shape and in addition minimizes mechanical damage to the film and alternation of the electric field.
WITH STAGGERED EDGES
Abstract of the Disclosure An electrical capacitor is formed utilizing a thin dielectric layer which is metallized on both sides to provide electrode areas. The capacitor is formed by pleating, or folding, the dielectric layer along its longitudinal dimension an odd number of times. The pleats are not creased but are allowed to form smoothly curved edges in which the radius of such bend is at least equal to the thickness of the film. In addition the edges of the pleats are progressively staggered so that the centers of the bend of one pleat edge is removed a distance of at least four film thicknesses from its neighboring centers. This configuration prevents the end of the capacitor from forming a "bar-bell" shape and in addition minimizes mechanical damage to the film and alternation of the electric field.
Description
89~
PLEATED METALLIZED FILM C~PACITOR
WITH STAGGERED ~DG~S
Bacliground of the Invention Electrical capacitors made of thin film dielectric material which is metallized on both sides are used in large quanlities il~
electrical devices because OI their reliability, their desirable elect-rical characteristics and their relat~vely low cost. ~apacitors may be made in which a dou~le sided metclllized dielectric layer is folded a number of times in its longitudinal direction~ The folded dielectric material may then be wound along its longitudinal dimension and end terminations may then be appliecl to it by spraying of metal against the edges of the wound capacitor segment~ T~is type of capacitor is extremely desirable because substantially all of the dielectric layer of the capacitor is in the electric field and the capacitor may be made without the insertion of an additional dielectric layer in the main body of the capacitor.
The configuration of the capacitor of the present invention provides a product which has all of the advantages of pleated, or pleated and wound, capacitors and also has tlle adàed advantages that the distortion of the electric field m the electrode areas is minimized, mechanical stress and the resulting damage is reduced and the capacitor `
-' does not assume a "barbell" shape with rings of a larger di~meler than the rest of tlle capacitors forming near the ends of the capacitor. ~ ;
In addition to the use of the present in~ention to manufacture wound film capacitors, it is also possible to utilize the invention to produce ceramic capacitors in which the capacitor dielectric material is folded ' ' .
9~
while the ceramic ma~erial on the dielectric layer is still in a "green" state.
In one broad aspect, the invention comprehends an electrical capacitor segment which comprises a di-electric layer, a first metallized electrode layer applied to one side of the dielectric layer, and a second metall-ized electrode layer applied to the other side of the di-electric layer. The dielectric layer is pleated so that a first plurality of pleat edges are formed along a first side of the capacitor segment and a second plurality of pleat edges are formed along a second side of the capacitor segment. Each pleat edge foxms a smooth generally circular bend with the center of each bend being displaced at least four times the thickness of the electric layer from the cen-ters of its adjacent neighbouring bends along the same side of the capacitor segment. The centers of the adjacent neighboring bends along the first side of the capacitor segment are progressively spaced lnwardly toward the center of the capacitor segment, when viewed from the top to the bottom of the capacitor segment, while the centers of the adjacent neighboring bellds along the second side of the capacitor segment are progressively spaced outwardly from the center of the capacitor segment, when viewed frdm the top to the bottom of the capacitor segment.
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9~40t Description of the Drawings .
The present invention is illustrated by reference to the -drawings in which:
~ig. 1 is a perspective view of a portion ol' a nlela~ ,c-dielectric layer which may be used in the construction of the capacitor of the present invention;
, ' ,' '.
Fig. 2 is a perspective view of a pleated melalli7,ed dielectric layer in accordance with the present invention having eight pleat .
lines in which an unmetallized dielectric insert is includcd;
Fig. 3 is a perspective view of the fully pleated dielectric layer of Fig, 2 which, in addition, shows a winding mandrel and an :
unmetallized dielectric insert; ~
: :
Fig. 4 is a diagrarnmatic showillg of the winding of a capacitor segment in accordance ~vitl~ t~e construcLioll Or l~`ig. ~
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Fig. 5 is an end view of a capacitor segment, before lead attachment, that is wound in accordance with the showing of Figs.
3 and 4;
Fig. 6 is an end view of the wound capacitor segment of Fig. 5 5 after it has been pressed into an oval shape;
Fig. 7 is a side view of a completed capacitor following the attachment of radial leads; and Fig, 8 is a perspective view of an alternate embodiment of the pFesent invention.
10 Technical Description of the Invention A portion of a commercially available metallized dielectric strip which may be unwound from a reel, that is suitable for a making of a capacitor in accordance with the present invention is shown in Fig. 1.
The metallized dielectric strip is formed with a dielectric la~er 12 oE
15 a thin film dielectric material, such as polyester~ polypropylene, poly-styrene, polycarbonate or other suitable material. A thin metallized electrode layer 14 is applied to the upper surface o-f the dielectric layer 12. Unmetallized margin areas may extend along the longitudinal edges of the strip 10 if deslred. ~ thin metallized electrode area is applied 20 to the lower surface of the dielectric layer 12. The electrode areas 14~ 20 may contain unmetallized strips where the pleats are to be made if a metallized end spray termination is to be employed.
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The embodiment shown in Fig. 1, the longitudinal dimension of the metallized strip 10 is shown along the arrows 26 while the narrow trans-verse dimension is shown along the arrows 28. The capacitor to be pleated is along the longitudinal imaginary lines 30, The capacitor oE
the present inventi~n, however, is not limited to one in which folding is along longitudinal lines since a capacitor could be made in accordance with the present invention by pleating along transverse lines iE the appropriate corresponding metallized and unmetallized areas were provided.
A pleated capacitor is shown in Fig~ 2 wherein it is to be noted that edges of the pleats 32, 34, 36 and 38 and 33, 35, 37, 39 are formed with a smooth generally circular bend which has a radius that is at least equal to the thickness of the dielectric layer 12. The center lines 41, 43, 45 and 47 through the centers of the bends 33, 35, 37, 39 are spaced 1~ so that they are displaced a distance of at least ~our tirnes the thicknessof the dielectric layer 12 from each other. The e~tension of the same rad-iue and displacement requirements apply to the pleats 32, 3~1, 36 and 38 o~ the other side of the capacitor. The edge,s 32-38 and 33-39 are staggered for two reasons:
(1~ To prevent mechanical "dumb-belling" of the wound section which occurs if the edges are held in alignment;
PLEATED METALLIZED FILM C~PACITOR
WITH STAGGERED ~DG~S
Bacliground of the Invention Electrical capacitors made of thin film dielectric material which is metallized on both sides are used in large quanlities il~
electrical devices because OI their reliability, their desirable elect-rical characteristics and their relat~vely low cost. ~apacitors may be made in which a dou~le sided metclllized dielectric layer is folded a number of times in its longitudinal direction~ The folded dielectric material may then be wound along its longitudinal dimension and end terminations may then be appliecl to it by spraying of metal against the edges of the wound capacitor segment~ T~is type of capacitor is extremely desirable because substantially all of the dielectric layer of the capacitor is in the electric field and the capacitor may be made without the insertion of an additional dielectric layer in the main body of the capacitor.
The configuration of the capacitor of the present invention provides a product which has all of the advantages of pleated, or pleated and wound, capacitors and also has tlle adàed advantages that the distortion of the electric field m the electrode areas is minimized, mechanical stress and the resulting damage is reduced and the capacitor `
-' does not assume a "barbell" shape with rings of a larger di~meler than the rest of tlle capacitors forming near the ends of the capacitor. ~ ;
In addition to the use of the present in~ention to manufacture wound film capacitors, it is also possible to utilize the invention to produce ceramic capacitors in which the capacitor dielectric material is folded ' ' .
9~
while the ceramic ma~erial on the dielectric layer is still in a "green" state.
In one broad aspect, the invention comprehends an electrical capacitor segment which comprises a di-electric layer, a first metallized electrode layer applied to one side of the dielectric layer, and a second metall-ized electrode layer applied to the other side of the di-electric layer. The dielectric layer is pleated so that a first plurality of pleat edges are formed along a first side of the capacitor segment and a second plurality of pleat edges are formed along a second side of the capacitor segment. Each pleat edge foxms a smooth generally circular bend with the center of each bend being displaced at least four times the thickness of the electric layer from the cen-ters of its adjacent neighbouring bends along the same side of the capacitor segment. The centers of the adjacent neighboring bends along the first side of the capacitor segment are progressively spaced lnwardly toward the center of the capacitor segment, when viewed from the top to the bottom of the capacitor segment, while the centers of the adjacent neighboring bellds along the second side of the capacitor segment are progressively spaced outwardly from the center of the capacitor segment, when viewed frdm the top to the bottom of the capacitor segment.
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9~40t Description of the Drawings .
The present invention is illustrated by reference to the -drawings in which:
~ig. 1 is a perspective view of a portion ol' a nlela~ ,c-dielectric layer which may be used in the construction of the capacitor of the present invention;
, ' ,' '.
Fig. 2 is a perspective view of a pleated melalli7,ed dielectric layer in accordance with the present invention having eight pleat .
lines in which an unmetallized dielectric insert is includcd;
Fig. 3 is a perspective view of the fully pleated dielectric layer of Fig, 2 which, in addition, shows a winding mandrel and an :
unmetallized dielectric insert; ~
: :
Fig. 4 is a diagrarnmatic showillg of the winding of a capacitor segment in accordance ~vitl~ t~e construcLioll Or l~`ig. ~
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--~ Case 3162 9~
Fig. 5 is an end view of a capacitor segment, before lead attachment, that is wound in accordance with the showing of Figs.
3 and 4;
Fig. 6 is an end view of the wound capacitor segment of Fig. 5 5 after it has been pressed into an oval shape;
Fig. 7 is a side view of a completed capacitor following the attachment of radial leads; and Fig, 8 is a perspective view of an alternate embodiment of the pFesent invention.
10 Technical Description of the Invention A portion of a commercially available metallized dielectric strip which may be unwound from a reel, that is suitable for a making of a capacitor in accordance with the present invention is shown in Fig. 1.
The metallized dielectric strip is formed with a dielectric la~er 12 oE
15 a thin film dielectric material, such as polyester~ polypropylene, poly-styrene, polycarbonate or other suitable material. A thin metallized electrode layer 14 is applied to the upper surface o-f the dielectric layer 12. Unmetallized margin areas may extend along the longitudinal edges of the strip 10 if deslred. ~ thin metallized electrode area is applied 20 to the lower surface of the dielectric layer 12. The electrode areas 14~ 20 may contain unmetallized strips where the pleats are to be made if a metallized end spray termination is to be employed.
: ' : , ':
Case 3162 ~0~
The embodiment shown in Fig. 1, the longitudinal dimension of the metallized strip 10 is shown along the arrows 26 while the narrow trans-verse dimension is shown along the arrows 28. The capacitor to be pleated is along the longitudinal imaginary lines 30, The capacitor oE
the present inventi~n, however, is not limited to one in which folding is along longitudinal lines since a capacitor could be made in accordance with the present invention by pleating along transverse lines iE the appropriate corresponding metallized and unmetallized areas were provided.
A pleated capacitor is shown in Fig~ 2 wherein it is to be noted that edges of the pleats 32, 34, 36 and 38 and 33, 35, 37, 39 are formed with a smooth generally circular bend which has a radius that is at least equal to the thickness of the dielectric layer 12. The center lines 41, 43, 45 and 47 through the centers of the bends 33, 35, 37, 39 are spaced 1~ so that they are displaced a distance of at least ~our tirnes the thicknessof the dielectric layer 12 from each other. The e~tension of the same rad-iue and displacement requirements apply to the pleats 32, 3~1, 36 and 38 o~ the other side of the capacitor. The edge,s 32-38 and 33-39 are staggered for two reasons:
(1~ To prevent mechanical "dumb-belling" of the wound section which occurs if the edges are held in alignment;
(2) TP minimize flat folds which constitute electrical weak points. The film is mechanically altered when it is .. :.
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Case 3 162 , . .
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stressed to bend over a zero overall radius. Further, the electric field intensity is increased in the dielectric near the fold line as the bending radius approaches zero radius.
The mechanical damage and electric field alteration contribute to making this fold line an electrically weakened area which will be first to clear by arcing away adjacent electrodes as the capacitor charging potential is increased. Excessive "clear-ing" will result in reduced insulation resistance, increased dissipation factor and reduced capacitance value.
In the embodiment of P'ig. 2, unmetallized dielectric layers 49 and 49' are employed to prevent the lowermost edges, such as the edge 38, from being deformed from its normal generally circular bend. In the alternate em~odiment of Fig. 8, these dielectric layers are removed which ~results in the lower bend 40 being creased from its normal circular bend, The con-figuration of Fig. 2s therefore, is preferred over that of Fig~ ~ where the increased cost of construction is acceptable for the desired applicakion. The dotted lines of Figs. 2 and 8 represent the second group of pleated layers OI
the capacitor while the solid lines represent the first group.
AEter the capacitor has been processed to form the capacil;or seg-ment shown in Fig. 2J a number of different additional processing steps ma~ be undertaken. For exampleJ if the pleated capacitor segment of Fig. 2 had unmetalliæed strips on the inside of each pleat this segment could be used to form a capacitor merely by spraying the right and left .
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hancl longitudinal edges of the segment with a metallized spray, such as babbitt or other suitable metal, in accordance with conventional practice, and then electrical leads could be secured to them, for example, b~
solderislg. Alternately, leads could be attached to the capacitor segmellt of Fig. 2 by use of conductive epoxy or other suitable known methods. In conjunction with the present preferred embodiment of the present in~ention, however, Fig. 2 represents two layers of a capacitor segment formed by winding oE the dielectric strip about the longitudinal dimension of the strip 10, as shown in Figs. 3 and 4, to form a wound capacitor. Another version of this capacitor could be achieved, ho~vever, by pl~atill~ the cayacitor se~-' ment of Fig. ~ a number of times transversely along transverse folcl lines such as the line 539 or alternately, pleating several times, and then com-pleting the segment by winding the remainder of the length of the dielectric strip.
' .
The winding of the capacltor segment of Fig. 2 into a wound capacitor may be achieved wlth various winding techniques, including the use of a split mandrel such as the mandrel 56 of Figs. 3 and 4, which may be removed from the capacitor segment after it has ~een wound. An unmetallized di-electric strip 58 is desirably initially wound around the mandrel to protect the metallized electrode areas of the metallized strip 10. The winding of the capacitor segment then continues unt;l it is almo~;t complete(l, at ~vhich ., ..: .
time an additional unmetallized dielectric strip 60 is then desirably wound into the structure to iorm an outer protective coating. The dielectric strip 60 may also be heat-sealed to itself to form the pleated capacitor segment 61 which is shown in Fig. 5. The removal of the mandrcl 5G from the '~ ' ., ~
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Case 3162 ~08g~
capacitor segment 61 leaves an opening 62 in the unit. ~he opening 62 may be closed by applying pressure, or pressure and heat~ in accord-ance with the type of dielectric layer used and conventional capacitor manufacturing techniques, to the capacitor segment 61 so that it assumes 5 an oval shape as shown in Fig. 6. Once the capacitor segment ot the embocliment of Figs, 3 and 7 has been wound, electrical leads may be connected to the unit. Either radial or axial leads may be applied to it.
For example, radial leads 709. 72 ends may be soldered, or connected by other means to edges 32, 34, 36, 38 and 33, 35, 87, 39 of the wound 10 ~ilm capacitor segment 61, as shown in Fig. 7.
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Case 3 162 , . .
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stressed to bend over a zero overall radius. Further, the electric field intensity is increased in the dielectric near the fold line as the bending radius approaches zero radius.
The mechanical damage and electric field alteration contribute to making this fold line an electrically weakened area which will be first to clear by arcing away adjacent electrodes as the capacitor charging potential is increased. Excessive "clear-ing" will result in reduced insulation resistance, increased dissipation factor and reduced capacitance value.
In the embodiment of P'ig. 2, unmetallized dielectric layers 49 and 49' are employed to prevent the lowermost edges, such as the edge 38, from being deformed from its normal generally circular bend. In the alternate em~odiment of Fig. 8, these dielectric layers are removed which ~results in the lower bend 40 being creased from its normal circular bend, The con-figuration of Fig. 2s therefore, is preferred over that of Fig~ ~ where the increased cost of construction is acceptable for the desired applicakion. The dotted lines of Figs. 2 and 8 represent the second group of pleated layers OI
the capacitor while the solid lines represent the first group.
AEter the capacitor has been processed to form the capacil;or seg-ment shown in Fig. 2J a number of different additional processing steps ma~ be undertaken. For exampleJ if the pleated capacitor segment of Fig. 2 had unmetalliæed strips on the inside of each pleat this segment could be used to form a capacitor merely by spraying the right and left .
: ~ .
~ '~
Q
hancl longitudinal edges of the segment with a metallized spray, such as babbitt or other suitable metal, in accordance with conventional practice, and then electrical leads could be secured to them, for example, b~
solderislg. Alternately, leads could be attached to the capacitor segmellt of Fig. 2 by use of conductive epoxy or other suitable known methods. In conjunction with the present preferred embodiment of the present in~ention, however, Fig. 2 represents two layers of a capacitor segment formed by winding oE the dielectric strip about the longitudinal dimension of the strip 10, as shown in Figs. 3 and 4, to form a wound capacitor. Another version of this capacitor could be achieved, ho~vever, by pl~atill~ the cayacitor se~-' ment of Fig. ~ a number of times transversely along transverse folcl lines such as the line 539 or alternately, pleating several times, and then com-pleting the segment by winding the remainder of the length of the dielectric strip.
' .
The winding of the capacltor segment of Fig. 2 into a wound capacitor may be achieved wlth various winding techniques, including the use of a split mandrel such as the mandrel 56 of Figs. 3 and 4, which may be removed from the capacitor segment after it has ~een wound. An unmetallized di-electric strip 58 is desirably initially wound around the mandrel to protect the metallized electrode areas of the metallized strip 10. The winding of the capacitor segment then continues unt;l it is almo~;t complete(l, at ~vhich ., ..: .
time an additional unmetallized dielectric strip 60 is then desirably wound into the structure to iorm an outer protective coating. The dielectric strip 60 may also be heat-sealed to itself to form the pleated capacitor segment 61 which is shown in Fig. 5. The removal of the mandrcl 5G from the '~ ' ., ~
" ~
Case 3162 ~08g~
capacitor segment 61 leaves an opening 62 in the unit. ~he opening 62 may be closed by applying pressure, or pressure and heat~ in accord-ance with the type of dielectric layer used and conventional capacitor manufacturing techniques, to the capacitor segment 61 so that it assumes 5 an oval shape as shown in Fig. 6. Once the capacitor segment ot the embocliment of Figs, 3 and 7 has been wound, electrical leads may be connected to the unit. Either radial or axial leads may be applied to it.
For example, radial leads 709. 72 ends may be soldered, or connected by other means to edges 32, 34, 36, 38 and 33, 35, 87, 39 of the wound 10 ~ilm capacitor segment 61, as shown in Fig. 7.
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Claims (10)
1. An electrical capacitor segment comprising a di-electric layer, a first metallized electrode layer applied to one side of said dielectric layer, a second metallized electrode layer applied to the other side of said di-electric layer, with said dielectric layer being pleated so that a first plurality of pleat edges are formed along a first side of said capacitor segment and a second plurality of pleat edges are formed along a second side of said capacitor segment and so that each pleat edge forms a smooth generally circular bend and with the center of each bend being displaced at least four times the thickness of said dielectric layer from the centers of its adjacent neighboring bends along the same side of said capacitor segment, and so that said centers of said adjacent neighboring bends along said first side of said capacitor segment are progressively spaced in-wardly toward the center of said capacitor segment, when viewed from the top to the bottom of said capacitor segment, while said centers of said adjacent neighboring bends along said second side of said capacitor segment are progressively spaced outwardly from the center of said capacitor segment, when viewed from the top to the bottom of said capacitor segment.
2. An electrical capacitor segment as claimed Claim 1, wherein a lead is secured to said pleat edges of said electrode layers.
3. An electrical capacitor segment as claimed in Claim 1, wherein said dielectric layer is an elongated layer and said capacitor segment is wound along the elongated dimension of said layer subsequent to said pleating along longitudinal pleat lines.
4. An electrical capacitor segment as claimed in Claim 3, wherein a lead is secured to said pleat edges of said electrode layers.
5. An electrical capacitor segment as claimed in Claim 3, wherein said dielectric layer is an elongated layer and said capacitor segment is pleated along lines transverse to the elongated dimension of said layer sub-sequent to said pleating along longitudinal pleat lines.
6. An electrical capacitor segment as claimed in Claim 5, wherein a lead is secured to said pleat edges of said electrode layers.
7. An electrical capacitor segment as claimed in Claim 1, wherein said circular bend has a radius at least equal to the thickness of said dielectric layer.
8. An electrical capacitor segment as claimed in Claim 7, wherein a lead is secured to said pleat edges of said electrode layers.
9. An electrical capacitor segment as claimed in Claim 7, wherein said dielectric layer is an elongated layer and said capacitor segment is wound along the elongated dimension of said layer subsequent to said pleating along longitudinal pleat lines.
10. An electrical capacitor segment as claimed in Claim 9, wherein a lead is secured to said pleat edges of said electrode layers.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/814,955 US4146914A (en) | 1977-07-12 | 1977-07-12 | Pleated metallized film capacitor with staggered edges |
| US814,955 | 1977-07-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1089040A true CA1089040A (en) | 1980-11-04 |
Family
ID=25216453
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA305,795A Expired CA1089040A (en) | 1977-07-12 | 1978-06-20 | Pleated metallized film capacitor with staggered edges |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4146914A (en) |
| JP (1) | JPS5420359A (en) |
| BR (1) | BR7804379A (en) |
| CA (1) | CA1089040A (en) |
| DE (1) | DE2830471A1 (en) |
| FR (1) | FR2397709A1 (en) |
| GB (1) | GB2001198B (en) |
| IT (1) | IT1096913B (en) |
| MX (1) | MX146180A (en) |
| NL (1) | NL7807438A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4912595A (en) * | 1988-06-20 | 1990-03-27 | Kabushiki Kaisha Route Six | Simple high tension capacitor |
| US6187028B1 (en) | 1998-04-23 | 2001-02-13 | Intermedics Inc. | Capacitors having metallized film with tapered thickness |
| DK173811B1 (en) * | 1998-06-29 | 2001-11-12 | Bentle Products Ag | Packed tape, method of making the tape, and apparatus for use in the method |
| GB0116365D0 (en) * | 2001-07-04 | 2001-08-29 | Mantock Paul L | A power controller |
| US8407871B2 (en) * | 2009-07-06 | 2013-04-02 | Delphi Technologies, Inc. | Method of manufacturing a shapeable short-resistant capacitor |
| GB201003808D0 (en) * | 2010-03-08 | 2010-04-21 | Mantock Paul L | A high energy storage capacitor |
| KR101661141B1 (en) * | 2014-08-18 | 2016-09-29 | (주)포인트엔지니어링 | Folding type capacitor comprising through hole |
| US9418791B1 (en) * | 2014-10-17 | 2016-08-16 | Black Night Enterprises, Inc. | Folded stack segmented film capacitor |
| CN106935405B (en) * | 2017-03-06 | 2018-09-04 | 西南交通大学 | A kind of folding film capacitor and production method |
| US10373767B2 (en) * | 2017-11-21 | 2019-08-06 | Vactronix Scientific, Llc | Structural supercapacitor composite and method of making same |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE754574C (en) * | 1940-06-11 | 1953-01-19 | Lorenz C Ag | Stacked capacitor with easily breakable dielectric intermediate layers |
| US2470826A (en) * | 1947-11-06 | 1949-05-24 | Bell Telephone Labor Inc | Fixed capacitor |
| US2919390A (en) * | 1953-07-31 | 1959-12-29 | Hunt Capacitors Ltd A | Electrical capacitors |
| FR2038725A5 (en) * | 1969-03-27 | 1971-01-08 | Boussange Aime |
-
1977
- 1977-07-12 US US05/814,955 patent/US4146914A/en not_active Expired - Lifetime
-
1978
- 1978-06-20 CA CA305,795A patent/CA1089040A/en not_active Expired
- 1978-07-07 BR BR7804379A patent/BR7804379A/en unknown
- 1978-07-07 MX MX174093A patent/MX146180A/en unknown
- 1978-07-07 IT IT25438/78A patent/IT1096913B/en active
- 1978-07-10 NL NL7807438A patent/NL7807438A/en not_active Application Discontinuation
- 1978-07-11 DE DE19782830471 patent/DE2830471A1/en not_active Withdrawn
- 1978-07-11 FR FR7820650A patent/FR2397709A1/en not_active Withdrawn
- 1978-07-11 JP JP8366378A patent/JPS5420359A/en active Pending
- 1978-07-12 GB GB7829581A patent/GB2001198B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| NL7807438A (en) | 1979-01-16 |
| US4146914A (en) | 1979-03-27 |
| DE2830471A1 (en) | 1979-01-25 |
| FR2397709A1 (en) | 1979-02-09 |
| GB2001198B (en) | 1982-01-13 |
| IT1096913B (en) | 1985-08-26 |
| BR7804379A (en) | 1979-04-03 |
| IT7825438A0 (en) | 1978-07-07 |
| GB2001198A (en) | 1979-01-24 |
| MX146180A (en) | 1982-05-21 |
| JPS5420359A (en) | 1979-02-15 |
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