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Multilayer fim capacitor and prodn. method thereof

A technology for film capacitors and a manufacturing method, which is applied in the directions of multilayer capacitors, capacitors, wire wound capacitors, etc., can solve the problem of inability to ensure the insulation withstand voltage of the cut surface, and achieve the effects of excellent productivity and high reliability.

Inactive Publication Date: 2003-12-24
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0022] However, even the metallized polypropylene film laminated film capacitors used so far cannot ensure the insulation withstand voltage of AC700V or more at the cut surface.
Therefore, laminated film capacitors that can be used with a rated voltage above AC350V have not yet been established.

Method used

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  • Multilayer fim capacitor and prodn. method thereof
  • Multilayer fim capacitor and prodn. method thereof
  • Multilayer fim capacitor and prodn. method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Table 1 shows the tan δ (@1kHz) of the capacitor of Example 1, the AC breakdown voltage during the withstand voltage test, and the capacitance reduction rate after the 2000-hour life test. The data in Table 1 is the average value of 5 samples. In Table 1, the breakdown voltage in the withstand voltage test is the voltage at which the capacitance reduction rate becomes 20%. The capacitance reduction rate after the life test was evaluated by measuring the capacitance of the capacitor at room temperature after applying an alternating current (AC) 550V at 60Hz for 2000 hours in a high-temperature bath at 70°C for 2000 hours.

[0062] tanδ(%)

Embodiment 2

[0064] In Example 2, copper core zinc (zinc evaporated with copper as the center) was used instead of the alloy of aluminum and zinc in Example 1 on the vapor-deposited metal of the metallized vapor-deposited polypropylene film on both sides. The metal deposited on the polypropylene film contained 99.2% by weight of zinc and 0.8% by weight of copper.

[0065] In Example 2, a laminated film capacitor was manufactured in the same manner as in Example 1 from Step 1 to Step 6, except that the metal material was vapor-deposited.

[0066] In Example 2, similarly to Example 1, it was confirmed by an optical microscope that the vapor-deposited metal was removed uniformly in the range of 0.09 mm from the cut surface.

[0067] Table 1 shows the capacitor tan δ (@1kHz) produced in Example 2, the breakdown voltage during the withstand voltage test, and the capacitance reduction rate after the 2000-hour life test.

Embodiment 3

[0069] In Example 3, the same method as in Step 1 to Step 4 in Example 1 was used to fabricate a laminated film capacitor. In addition, in step 5, the cut surface of the capacitor element is irradiated with a pulsed laser manufactured by Nippon Laser Systems Co., Ltd., and the metal exposed on the cut surface and the vapor-deposited metal on the film surface near the cut surface are removed. The laser wavelength is 1.06 μm, and the spot diameter is 0.5 mm.

[0070] The irradiation parameters of the laser are as follows: the pulse width is 200ns, the frequency is 3kHz, and the peak power energy density of one pulse is 60kW / mm 2 . The product of pulse width and frequency (duty cycle) is 6×10 -4 . Since the laser beam is scanned by a galvano mirror, the entire cut surface is irradiated. At this time, the scanning speed of the laser is 600 mm / sec, and the scanning lines are moved at intervals of 0.3 mm.

[0071] In Example 3, similarly to Example 1, it was confirmed by an opt...

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PUM

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Abstract

A both-side-metallized polypropylene film having aluminum-zinc alloy evaporated on both sides of the film and a non-metallized polypropylene film are wound on a cylindrical bobbin plural times, thus providing a cylindrical winding body formed of multi-layer films. Then, sprayed-metal electrodes are formed on both sides of the cylindrical winding body. The cylindrical winding body is cut to obtain plural capacitor elements. Pulse laser beam is applied to a cut surface of the capacitor element, then metal exposed on the cut surface and metal evaporated on a surface of the films near the cut surface are removed by a distance not shorter than 0.05mm from the cut surface. This processes provides a multi-layer film capacitor usable at a voltage not lower than AC350V.

Description

technical field [0001] The present invention relates to a laminated film capacitor used in electric machinery, electronic equipment, and industrial equipment. Background technique [0002] A conventional manufacturing method of a laminated film capacitor is disclosed in Japanese Unexamined Patent Publication No. 55-160420, for example. A metal-deposited thin film is wound on a large ring-shaped cylinder, and a spray electrode is formed on the end surface by spray plating to produce a base capacitor. The bulk capacitor is then cut off with a saw blade to obtain a plurality of unit capacitors. The man-hours of a laminated film capacitor manufactured by this method can be significantly reduced compared with the man-hours of a wound capacitor manufactured by winding a unit capacitor. [0003] For film capacitors, if the operating voltage is high, the dielectric film is generally thickened to ensure the insulation withstand voltage. For laminated film capacitors, like general ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01G4/14H01G4/232H01G4/30H01G4/32
CPCH01G4/232H01G4/14H01G4/32H01G4/145H01G4/30
Inventor 斋藤俊晴中坪和弘纳村和美涉谷正俊西森敏幸
Owner PANASONIC CORP
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