WO2013161063A1 - Metal deposition film - Google Patents

Description

Metallized film

The present invention relates to a metal vapor deposition film.

Conventionally, capacitors are used as elements for smoothing current and removing noise components in electrical circuits. In recent years, a capacitor called a film capacitor has been used as this capacitor. A film capacitor has a structure in which multiple layers of a metal vapor deposition film with a metal film deposited on one or both sides of a dielectric film are stacked, and one terminal extending from a power supply or load is connected to the electrode terminal of a predetermined metal vapor deposition film. Then, the other terminal is connected to the electrode terminal of the metal vapor deposition film on the upper layer or the lower layer of the predetermined metal vapor deposition film. By doing so, a capacitor having a configuration in which the metal film connected to one terminal and the metal film connected to the other terminal face each other through the dielectric film is formed.

On the deposition surface of the dielectric film, a deposition region where the metal film is deposited and a non-deposition region where the metal film is not deposited are formed. Since the non-deposition region is formed in a groove shape, it is called a non-evaporation slit. This non-evaporation slit divides the deposition area into a plurality of portions. The partitioned individual deposition areas are called segments.

For example, in Patent Documents 1 to 3, a rectangular segment 112 surrounded by a lattice-shaped non-deposition slit 110 as shown in FIG. 13 is formed on a dielectric film 114. The non-evaporation slit 110 is partially interrupted and a metal film is deposited, and adjacent segments can be electrically connected through the interrupted portion 116. The portion where the non-evaporation slit is interrupted is called a fuse portion 116.

The fuse portion 116 has a function of interrupting conduction between the predetermined segment and the adjacent segment when the predetermined segment is in a dielectric breakdown state. As shown in FIG. 14, when a dielectric breakdown occurs due to a dielectric material in a predetermined segment 112A being missing or formed thinner than other regions, etc., and a dielectric breakdown that causes conduction with a lower layer segment occurs, the fuse portion 116 As a result, the amount of current flowing into the predetermined segment 112A increases. As the amount of current flowing through the fuse portion 116 increases, the temperature of the fuse portion 116 rises and the metal film of the fuse portion 116 is evaporated and scattered. As a result, segment 112A is isolated from adjacent segments 112B-112E. Such a function of isolating a segment in a dielectric breakdown state from an adjacent segment to eliminate the dielectric breakdown state of the film capacitor is called a self-healing function.

JP-A-8-250367 JP-A-11-26275 JP 2004-87648 A JP 2007-201313 A

By the way, when the segment is formed in a rectangular shape, the current distribution flowing in the segment is biased. As shown in FIG. 15, the current flowing through the rectangular segment 112 mainly flows through the central portion 115 and hardly flows through the corner portion 117. As the current concentrates on the central portion 115, the temperature of the central portion 115 rises. As a result, there has been a problem that a part of the metal film of the central portion 115 is evaporated and scattered, or dielectric breakdown is likely to occur due to a decrease in the insulation resistance of the dielectric due to temperature rise.

Therefore, an object of the present invention is to make the current flow in the segment more uniform than in the past.

The present invention relates to a metal vapor deposition film. The metal vapor-deposited film includes a dielectric film, and a terminal electrode portion on which a metal film is vapor-deposited is formed at one end of both ends in the width direction of the dielectric film, and a metal film is vapor-deposited at the other end. A non-deposited portion is not formed. Further, between the terminal electrode portion and the non-deposition portion, a metal film deposition region and a non-evaporation slit that divides the deposition region into a plurality of segments and where the metal film is not deposited are formed. A part is interrupted by the fuse part which vapor-deposited, and the adjacent segments can be conducted by the fuse part. The shape of the non-deposition slit is a first slit formed along a first curve having an arc shape or an elliptical arc shape, and a second slit formed along a second curve obtained by inverting the first curve. Are corrugated shapes that are alternately connected along the width direction, and the corrugated non-deposition slits are inverted along the longitudinal direction perpendicular to the width direction so as not to intersect the adjacent non-deposition slits. A plurality are formed. A fuse part is formed in the connection part of a 1st curve and a 2nd curve, and the narrow part where the distance between adjacent non-evaporation slits becomes the shortest.

In the above invention, it is preferable that the fuse portion provided at the connection point between the first curve and the second curve and the fuse portion provided in the narrow portion are formed to have the same width.

The present invention also relates to a metal vapor deposition film. The metal vapor-deposited film includes a dielectric film, and a terminal electrode portion on which a metal film is vapor-deposited is formed at one end of both ends in the width direction of the dielectric film, and a metal film is vapor-deposited at the other end. A non-deposited portion is not formed. Further, between the terminal electrode portion and the non-deposition portion, a metal film deposition region and a non-evaporation slit that divides the deposition region into a plurality of segments and where the metal film is not deposited are formed. A part is interrupted by the fuse part which vapor-deposited, and the adjacent segments can be conducted by the fuse part. The non-evaporation slit has a U-shaped curved shape, and a plurality of non-evaporation slits are formed along the width direction and the longitudinal direction perpendicular to the width direction so as not to intersect with the adjacent non-evaporation slits. The fuse part is formed at the inflection point of the non-evaporation slit and the narrow part where the distance between the adjacent non-evaporation slits is the narrowest.

According to the present invention, the current flow in the segment can be made more uniform than in the past.

It is a figure which illustrates the metal vapor deposition film which concerns on this embodiment. It is a figure which illustrates the metal vapor deposition film which concerns on this embodiment. It is an enlarged view of the metal vapor deposition film which concerns on this embodiment. It is an enlarged view of the metal vapor deposition film which concerns on this embodiment. It is the figure which compared the conventional metal deposition film and the metal vapor deposition film which concerns on this embodiment. It is a figure which illustrates the metal vapor deposition film which concerns on other embodiment. It is a figure which illustrates the metal vapor deposition film which concerns on other embodiment. It is a figure which illustrates the metal vapor deposition film which concerns on other embodiment. It is a figure which illustrates the metal vapor deposition film which concerns on other embodiment. It is a figure which illustrates the metal vapor deposition film which concerns on other embodiment. It is a figure which illustrates the metal vapor deposition film which concerns on other embodiment. It is a figure which illustrates the metal vapor deposition film which concerns on other embodiment. It is a figure which illustrates the conventional metal vapor deposition film. It is an enlarged view of the conventional metal vapor deposition film. It is an enlarged view of the conventional metal vapor deposition film.

FIG. 1 shows a metal vapor deposition film according to this embodiment. The metal vapor-deposited film 10 is also called a metallized film, and a metal film is vapor-deposited on the dielectric film 12. The dielectric film 12 is made of an insulating resin, and is made of, for example, polyethylene terephthalate or polypropylene. The dielectric film 12 is a rectangular thin film, and is wound around the longitudinal direction along the longitudinal direction as will be described later.

The metal film is made of, for example, aluminum, zinc, or an alloy thereof. The metal film is formed on the dielectric film 12 by using a known vapor deposition technique such as PVD such as vapor deposition or sputtering, or CVD.

A terminal electrode portion 14 in which a metal film is deposited along the longitudinal direction is formed at one end portion of both end portions in the width direction of the dielectric film 12. A non-deposition portion 16 where a metal film is not deposited is formed along the longitudinal direction at the other end. Furthermore, between the terminal electrode part 14 and the non-deposition part 16, the vapor deposition area | region where the metal film was vapor-deposited and the non-deposition slit 20 which divides this vapor deposition area into the some segment 18 are formed. Here, the metal film thickness in the terminal electrode portion 14 is formed to be thicker than the metal film thickness in the segment 18.

The non-evaporation slit 20 is partially broken by the fuse portion 22 on which a metal film is deposited. The fuse portion 22 allows conduction between adjacent segments 18. Here, the shape of the non-evaporation slit 20 and the arrangement of the fuse portion 22 will be described with reference to FIG. The non-deposition slit 20 has a curved corrugated shape, and is formed along a first slit 25 formed along the first curve 24 and a second curve 26 obtained by inverting the first curve 24. The second slits 27 are alternately connected to each other. Here, the inversion center axis is a straight line that passes through the connection point 28 between the first curve 24 and the second curve 26 and is parallel to the width direction. Further, the first curve 24 and the second curve 26 are formed from an arc or an elliptic arc.

The non-evaporation slit 20 is formed so as to extend along the width direction of the metal vapor deposition film 10. A plurality of non-evaporation slits 20 are arranged in the longitudinal direction. Here, the non-evaporation slits 20 are formed in the longitudinal direction while being reversed at a predetermined interval so as not to contact each other. As a result, the first slit 25 of the adjacent non-deposition slit 20A and the second slit 27 of the non-deposition slit 20B face each other, and the second slit 27 of the non-deposition slit 20A and the first slit 25 of the non-deposition slit 20B opposite. The segment 18 defined by the curved non-deposition slit 20A and non-deposition slit 20B has a substantially circular shape.

The fuse part 22 includes a first fuse part 22A formed so as to cut off a part of the non-evaporation slit 20, and a second fuse part 22B formed by a gap between the non-evaporation slit 20A and the non-evaporation slit 20B. Consists of. The first fuse portion 22 </ b> A is provided at a connection point 28 (switching point) between the first curve 24 and the second curve 26. The second fuse portion 22B is provided in a narrow portion where the distance between the non-evaporation slit 20A and the non-evaporation slit 20B is the narrowest. Here, the first fuse portion 22A and the second fuse portion 22B are formed to have the same width d. In FIG. 2, the width d of the first fuse portion 22 </ b> A and the second fuse portion 22 </ b> B is formed narrower than the groove width of the non-deposition slit 20, but may be greater than the groove width.

Next, a process for forming a film capacitor using the metal vapor deposited film 10 according to this embodiment will be described. As shown in FIG. 3, the metal vapor deposition film 10 is wound up in a state where a plurality of metal vapor deposition films 10 are laminated. At the time of lamination, the respective films are laminated so that the terminal electrode portions 14 of the upper metal vapor deposition film 10A and the lower metal vapor deposition film 10B are opposed to each other when viewed from the width direction. That is, the non-deposition portion 16 of the lower metal vapor deposition film 10B is overlaid on the terminal electrode portion 14 of the upper metal vapor deposition film 10A. After the laminated metal vapor deposition films 10 </ b> A and 10 </ b> B are wound into a cylindrical shape, a metal electrode called a metallicon is sprayed on the side surface 32. At this time, the terminal electrode portion 14 of the upper metal deposition film 10A and the metallicon on the side surface 32A are electrically connected, and the terminal electrode portion 14 of the lower metal deposition film 10B and the metallicon on the side surface 32B are electrically connected. The Further, a lead wire 33 is drawn from each metallicon and connected to a power supply or load terminal.

The current flow in the film capacitor thus formed will be described. When the upper terminal electrode part 14 is on the positive electrode side and the lower terminal electrode part 14 is on the negative electrode side, a current flows from the upper terminal electrode part 14 to the metal vapor deposition film 10. The current flows generally from the terminal electrode portion 14 toward the non-deposition portion 16, that is, away from the terminal electrode portion 14 in the width direction. Here, the flow of current passing through the segment 18 is schematically shown in FIG. Current flows into the segment 18 from the first fuse part 22C and the second fuse part 22D arranged on the terminal electrode part 14 side of the segment 18. The current 40 flowing from the first fuse part 22C branches and passes through the first fuse part 22E and the second fuse part 22F on the non-deposition part 16 side. In addition, the current 42 flowing into the segment 18 from the second fuse portion 22D branches and passes through the first fuse portion 22E and the second fuse portion 22F. Thus, in the metal vapor deposition film 10 which concerns on this embodiment, the bias | inclination of the electric current distribution in a segment is reduced compared with the conventional rectangular segment, and an electric current flows into a segment equally. Therefore, the risk of current being biased to a predetermined location in the segment and leading to dielectric breakdown is reduced as compared with the prior art. Since dielectric breakdown is less likely to occur, segment isolation due to fusing of the fuse is less likely to occur. Since segment isolation is less likely to occur, a reduction in the electrode area of the metal vapor deposition film is avoided, and a reduction in capacitance is avoided.

Furthermore, in the present embodiment, the widths of the first fuse portion 22C and the second fuse portion 22D into which current flows are formed to be equal. Therefore, current flows equally from each fuse portion into the segment 18. In the present embodiment, the widths of the first fuse portion 22E and the second fuse portion 22F from which current flows are also formed to be equal. Therefore, current flows out equally from the segment to each fuse.

The upper part of FIG. 5 shows the results of a withstand voltage test between the metal vapor-deposited film 10 according to this embodiment and the metal vapor-deposited film 43 made of a conventional rectangular segment. In this test, the groove width of the non-deposition slit 20 and the width of the fuse portion in each metal vapor deposition film are configured to be equal. Moreover, the voltage application time with respect to each metal vapor deposition film is also set equally. In addition, the film thickness and area of the segments are configured to be substantially equal. As shown in the upper part of FIG. 5, the metal vapor-deposited film 10 according to the present embodiment has a lower capacitance reduction rate than the conventional metal vapor-deposited film 43, in other words, the withstand voltage performance is improved.

Furthermore, the lower part of FIG. 5 shows the results of a current resistance test between the metal vapor-deposited film 10 according to the present embodiment and the metal vapor-deposited film 43 made of a conventional rectangular segment. In addition, it is comprised so that the groove width of the non-evaporation slit 20 in each metal vapor deposition film and the width | variety of a fuse part may become equal similarly to the upper stage of FIG. Moreover, the current supply time for each metal vapor deposition film is also set equal. In addition, the film thickness and area of the segments are configured to be substantially equal. As shown in the lower part of FIG. 5, the metal vapor deposition film 10 according to this embodiment has a lower temperature rise rate than the conventional metal vapor deposition film 43. Since the temperature rise can be suppressed, it is possible to suppress the evaporation scattering of the metal film of the segment 18 and the decrease in the insulation resistance of the dielectric as compared with the conventional metal vapor deposition film 43.

Further, the shape of the non-deposition slit 20 may be a shape as shown in FIG. 6 instead of the shape shown in FIGS. The non-deposition slit 50 shown in FIG. 6 has a substantially U-shaped curved shape, and a plurality of non-deposition slits 50 are formed at predetermined intervals in the width direction and the longitudinal direction of the metal vapor deposition film 10. The curved opening of the non-evaporation slit 50 is provided on the terminal electrode portion 14 side. A fuse portion 54 is provided at the inflection point 52 of the non-evaporation slit 50. Also, a fuse portion 54 is provided in a narrow portion where the distance between adjacent non-deposition slits 50 is the shortest. The width d of the fuse portion 54 provided at the inflection point 52 and the fuse portion 54 provided at the narrow portion are formed to be equal.

In FIG. 6, the curved shape of the non-deposition slit 50 is formed along a quadratic function curve. However, the shape is not limited to a quadratic function curve, and may be a shape obtained from an arbitrary curve function such as an exponential function curve or a logarithmic curve.

A current 58 flowing from the terminal electrode portion 14 branches into two narrow narrow fuse portions 54A between the non-evaporation slits 50 adjacent in the width direction and a narrow fuse portion 54B between the non-evaporation slits 50 adjacent in the longitudinal direction. To do. Here, since the widths of the respective fuses are formed to be equal, the current is substantially divided into three and flows to the respective fuse portions 54 evenly. Also, the current 60 that has passed through the two narrow fuse portions 54A between the non-evaporation slits 50 adjacent in the width direction and the current 62 that has passed through the fuse portion 54C provided at the inflection point 52 of the non-evaporation slit 50 are merged. And passes through the fuse portion 54C. As described above, the current flows uniformly in each segment 18, and the current distribution bias as in the conventional case is reduced.

Further, as shown in FIG. 7, a linear non-deposition slit 60 extending in the width direction may be additionally formed. The straight non-evaporation slit 60 is provided between the curved non-evaporation slits 50 adjacent in the longitudinal direction, and is further provided at a position penetrating the inflection point 52 of the curved non-evaporation slit 50. The linear non-evaporation slit 60 is provided with fuse portions 54 at predetermined intervals.

Further, as shown in FIG. 8, when forming a plurality of sets 62 of non-deposition slits 50 arranged in the longitudinal direction in the width direction, the sets 62 of non-evaporation slits 50 are formed by offsetting by a predetermined interval in the longitudinal direction. May be. At this time, the fuse portion 54C provided at the inflection point of the non-evaporation slit 50 and the fuse portion 54A provided in the narrow portion between the non-evaporation slits 50 adjacent in the width direction are arranged on a straight line parallel to the width direction. The offset interval may be set as described.

Furthermore, as shown in FIG. 9, the non-deposition slit 50 may be formed so as to increase as it approaches the terminal electrode portion 14. In this case, the area of the segment 18 increases as it approaches the terminal electrode portion 14. The amount of current in the vicinity of the terminal electrode portion 14 is larger than that on the non-deposition portion 16 side, and the rate of temperature rise is increased accordingly. By increasing the area of the segment 18 in the vicinity of the terminal electrode portion 14 with a large amount of current to reduce the resistance, the temperature increase in the vicinity of the terminal electrode portion 14 can be mitigated.

Further, in the embodiment shown in FIGS. 6 to 9, the open curve of the non-deposition slit is provided on the terminal electrode portion 14 side. However, as shown in FIG. The inflection point 52 may be provided on the terminal electrode portion 14 side. This also makes the current distribution uniform compared to the conventional grid-type segment.

Also, as shown in FIG. 11, the non-evaporation slit 50 is circular, or the non-evaporation slit is elliptical as shown in FIG. 12, and the portion closest to the terminal electrode portion 14 and the portion closest to the non-evaporation portion 16 are provided. A fuse portion 54 may be provided. This shape also makes the current distribution uniform compared to the conventional rectangular segment.

10 metal evaporated film, 12 dielectric film, 14 terminal electrode part, 16 non-evaporated part, 18 segment, 20, 50, 60 non-evaporated slit, 22,54 fuse part, 24 first curve, 26 second curve, 28 connection points, 32 film capacitor side surfaces, 52 inflection points.

Claims (3)

With a dielectric film,
A terminal electrode portion on which a metal film is deposited is formed at one end of both ends in the width direction of the dielectric film, and a non-deposition portion on which the metal film is not deposited is formed at the other end.
Between the terminal electrode part and the non-evaporation part, a non-evaporation slit in which the metal film is not vapor-deposited, and the vapor deposition area of the metal film and the vapor deposition area are divided into a plurality of segments are formed,
The non-evaporation slit is partially interrupted by the fuse part on which the metal film is deposited, and the adjacent segments by the fuse part can conduct.
The non-evaporation slit has a first slit formed along a first curve having an arc shape or an elliptic arc shape and a second curve formed along a second curve obtained by inverting the first curve. The wave-shaped slits are alternately connected along the width direction, and the wave-shaped non-deposition slits intersect the adjacent non-deposition slits along the longitudinal direction perpendicular to the width direction. It is formed in plural while reversing so as not to
The fuse part is formed at a connection point between the first curve and the second curve and a narrow part where a distance between adjacent non-evaporation slits is the narrowest. the film. It is a metal vapor deposition film of Claim 1, Comprising:
The metal vapor deposition film, wherein the fuse portion provided at the connection point between the first curve and the second curve and the fuse portion provided in the narrow portion have the same width. . With a dielectric film,
A terminal electrode portion on which a metal film is deposited is formed at one end of both ends in the width direction of the dielectric film, and a non-deposition portion on which the metal film is not deposited is formed at the other end.
Between the terminal electrode part and the non-evaporation part, a non-evaporation slit in which the metal film is not vapor-deposited, and the vapor deposition area of the metal film and the vapor deposition area are divided into a plurality of segments are formed,
The non-evaporation slit is partially interrupted by the fuse part on which the metal film is deposited, and the adjacent segments by the fuse part can conduct.
The non-evaporation slit has a U-shaped curved shape, and a plurality of the non-evaporation slits do not cross the adjacent non-evaporation slits along the width direction and a longitudinal direction perpendicular to the width direction. Formed,
The metal vapor deposition film, wherein the fuse portion is formed at an inflection point of the non-deposition slit and a narrow portion where a distance between adjacent non-deposition slits is the smallest.

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