JPH0232772B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a rolled metallized film for a capacitor in which a safety function is provided to the element itself.

In recent years, as a safety function in capacitors, a margin part 1 is provided at the end in the width direction as shown in Fig. 1, and a plurality of margin parts 2 are provided intermittently in the length direction and are continuous with the margin part 1 to divide the capacitor. A capacitor element 5 is constructed by laminating and winding a pair of metallized films 4 on which electrodes 3 are formed, and a large number of small-capacity element elements are connected in parallel within the element. 3. Even if a part of 3 is destroyed, the function of that part is limited and the effect on other elements is eliminated, thereby preventing an explosion from occurring, which is attracting attention. However, as a conventional means for forming a plurality of margin parts intermittently in the length direction, for example, Japanese Patent Application Laid-Open No. 57-119
Some of these are disclosed in Japanese Patent Application Laid-Open No. 118623 or Japanese Patent Application Laid-Open No. 152122/1983. First, the method disclosed in Japanese Patent Application Laid-Open No. 57-118623 leaves a margin at one end in the width direction and applies a voltage by bringing conductive parts into contact at regular intervals with a metallized film on which vapor-deposited electrodes have been applied on the other side. The vapor-deposited electrodes at the required locations are scattered by sparks to form a plurality of margins intermittently in the length direction.
In the method disclosed in Japanese Patent No. 57-152122, when the dielectric film is fed, oil is applied to the area where the margin portion is formed, and electrode material is applied to the area other than the area where the oil is applied. However, according to the method disclosed in Japanese Patent Application Laid-Open No. 57-118623, the scattered evaporated electrode powder adheres to the conductive part, so not only is the scattering insufficient, but the film is also damaged by the evaporated electrode powder, so the insulation resistance and It has the disadvantage of decreasing breakdown voltage characteristics, and
According to the means disclosed in Japanese Patent No. 152122, it was impossible to avoid oil adhesion to unnecessary areas, and the desired margin portion could not be obtained, resulting in so-called blurred margins, which could not be said to be a practically preferable means.

The present invention has been made in view of the above points, and uses a rotating mask having a lattice-like frame around the entire periphery and a plurality of spaces between the lattice-like frames, and is used to prevent the dielectric film from running when forming a vapor-deposited electrode. The rotating mask is brought into contact with the dielectric film, and margins in a vertical and horizontal lattice pattern are formed on the grid-shaped frame abutting portions of the rotating mask.The parts other than the margins are metallized, and the necessary parts are formed in the lengthwise direction of the dielectric film. It is an object of the present invention to provide a manufacturing method capable of efficiently obtaining a rolled metallized film for a capacitor, which has a safety function for the capacitor element itself and is cut into pieces.

An embodiment of the present invention will be described below with reference to the drawings. That is, as shown in FIG. 2, in the step of running the dielectric film 11 through support rollers 12 and 13 and performing vacuum deposition on the way, vapor-deposited metal is applied to the dielectric film 11 between the support rollers 12 and 13. As shown in FIG. 3, which is synchronized with the winding core 14 wound as a plasticized film, it has a lattice-like frame 17 consisting of a longitudinal margin forming frame part 15 and a width direction margin forming frame part 16 around the entire periphery. A rotating mask 19 having a plurality of spaces 18 between the lattice frames 17 is arranged. In this case, the dielectric film 11 of the width direction margin forming frame portion 16
The width of the frame that functions as the intermediate margin forming frame for the end face margin forming frame is wider than the width of the frame that functions as the end face margin forming frame, and the width is usually twice the width of the end face margin forming frame. Next, electrode material 21 is sprayed in a vacuum from an electrode material melting crucible 20 provided in the rotating mask 19, and is deposited on the dielectric film 11 through the spaces 18 between the lattice frames 17. By continuously running the body film 11 in the direction of the arrow, as shown in FIG. A metallized film 26 with a lattice-like margin is formed with the other portions serving as vapor deposition electrodes 25.
Note that the width of the margin located in the middle of the width direction margin 22 is twice the width of the margin located at the end face. As shown in FIG. 5, the grid-shaped margined metallized film 26 is cut in the width direction, that is, in the middle between the longitudinal margins 22, and in the middle of the margins located in the middle of the longitudinal margins 22, as indicated by dotted lines. Then, as shown in FIG. 6, a metallized film 29 for a capacitor is obtained, in which a margin part 28 is provided intermittently in the length direction and connected to a margin part 27 located at one end in the width direction. It is.

According to the method for producing the metallized film for capacitors constructed as described above, the rotating mask 19 synchronized with the winding core consisting of the lattice-shaped frame 17 is used as a margin forming means, and the portion corresponding to the margin portion 24 is formed by the lattice-shaped frame. Since it is deposited in a state where it is reliably covered by the capacitor 17, a clear margin portion 24 without margin blurring is obtained, and when it is configured as a capacitor, it exhibits excellent effects without deterioration of various characteristics. Also, the completed metallized film 2 with a grid-like margin
By simply cutting 6, a plurality of metallized films 29 with security functions can be obtained at one time, and an extremely high effect on efficiency can be obtained. In the above embodiment, the explanation was given by exemplifying a case where there is one margin located in the middle of the length direction margin, but if necessary, if two or more margins are used, the metallized film with a security function can be more efficiently obtained. can get.
Further, in the above embodiment, the lattice shape has a right angle pattern, but as shown in FIG. do not have.
31 is a longitudinal margin.

As described above, according to the present invention, a rotating mask provided with a lattice frame around the entire periphery is brought into contact with a dielectric film during vapor deposition, a lattice margin is formed in the area where the lattice frame contacts, and then By cutting the metallized film into capacitors, a highly accurate margin can be obtained very efficiently, and a method for manufacturing a metallized film for capacitors can be obtained which has a safety function of high industrial value.

[Brief explanation of drawings]

Fig. 1 is a general plan view of a metallized film for capacitors that provides a safety function to the element itself, Figs. 2 to 6 are related to the present invention, Fig. 2 is a process schematic diagram, and Fig. 3 is a rotating mask. FIG. 4 is a plan view showing the metalized film with a grid-like margin, FIG. 5 is a plan view showing the cut points of the metalized film with a grid-like margin shown in FIG. 4, and FIG. FIG. 7 is a plan view showing a completed metallized film for a capacitor, and FIG. 7 is a plan view showing a metallized film with a lattice-like margin according to another embodiment. DESCRIPTION OF SYMBOLS 11... Dielectric film, 12, 13... Support roller, 17... Grid frame, 18... Space part, 1
9... Rotating mask, 21... Electrode material, 24,2
7, 28...margin part, 25...evaporation electrode, 2
6...Metalized film with lattice margin, 29...
...Metalized film for capacitors.

Claims (1)

[Claims] 1. When the dielectric film is run through at least two support rollers, a rotary mask having a grid-like frame around the entire circumference between the support rollers and a space between the grid-like frames is brought into contact with the dielectric film. an electrode material is vacuum-deposited from inside the rotary mask onto a portion of the dielectric film that is in contact with the rotary mask and located in the space to form a deposited electrode, and the lattice-like shape of the dielectric film is A margin portion is formed in the portion located at the frame abutting portion to form a metallized film with a grid-like margin, and then,
A metallized film for a capacitor, characterized in that the metallized film is cut in the length direction and a plurality of margin parts are provided intermittently in the length direction by connecting the margin parts located at one end in the width direction. Production method.