JPH01283808A - Uncoated chip type laminated capacitor - Google Patents

Abstract

PURPOSE:To make it possible to record information to show its manufacturing time inside of it by having a protective insulating sheet on which numerical or alphabetical characters, or a bar code is printed. CONSTITUTION:Metallized dielectric sheets 3 in each of which an electrode 5 is formed at a dielectric sheet 1 are laminated to form a laminate 4. Further, a protective insulating sheet 7 provided with manufacturing time indication where combination 6 of numerals and alphabet to show manufacturing time is printed on a protective insulating sheet 5 having the same area as that of the dielectric sheet 1 is piled on the upper side of the laminate 4 such that the indicate face looks upward so as to form a laminate 8. Protective insulating sheets 9 having the same areas as those of the sheets 1 and 5 are piled on both upper and lower sides of this laminate 8, and electrode terminals 11 are provided at both ends. Hereby, manufacturing time can be indicated inside a capacitor, which enables users to know it easily by a trouble cause investigation method usually used.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a non-exterior material in which a plurality of dielectric sheets on which electrodes are formed are laminated, protective insulating sheets are overlaid on both the upper and lower surfaces, and electrode terminals are provided on both ends. Regarding chip-type multilayer capacitors.

[Conventional technology]

In general, for unpacked chip-type multilayer capacitors that do not have an external packaging such as a resin mold, information such as the manufacturing date was not recorded on the surface or inside the capacitor, but was pasted on a label inside the packaging bag or on the packaging box. It was displayed on the label.

[Problem to be solved by the invention]

The above-mentioned conventional method of displaying the manufacturing date, etc., is used when the capacitor is taken out of the packaging bag or packaging box and mounted on a glass epoxy printed wiring board or ceramic substrate, unless it is recorded one-to-one. The disadvantage is that the timing is unclear. Recording on a one-to-one basis is a very wasteful task for electronic products that typically consist of hundreds to thousands of parts.

An object of the present invention is to provide a non-exterior chip type multilayer capacitor in which information indicating the manufacturing date is recorded.

[Means to solve the problem]

The non-exterior chip type multilayer capacitor of the present invention is a multilayer capacitor in which a plurality of dielectric sheets on which electrodes are formed are laminated, protective insulating sheets are overlaid on both the upper and lower surfaces, and electrode terminals are provided on both ends. It has a protective insulation sheet with a code printed on it.

〔Example〕

Next, the present invention will be explained with reference to the drawings. FIGS. 1(a) to 1(g) are perspective views of each step for explaining the first embodiment of the present invention and its assembly method.

First, as shown in FIG. 1(a), metallized dielectric sheets 3 in which electrodes 2 are formed on dielectric sheets 1 are laminated as shown in FIG. 1(b) to form a laminate 4. A protective insulating sheet 7 with a manufacturing date indication is printed on a protective insulating sheet 5 having the same area as the dielectric sheet as shown in FIG. As shown in FIG. 1(d), the display surface of the laminate 4 is stacked on top of the laminate 4 to form a laminate 8. In this case, a material having low X-ray transmittance, such as silver paste, is used for the printing machine. This laminate 8
A dielectric sheet and a protective insulating sheet 9 having the same area as the protective insulating sheet with manufacturing date indication are superimposed on both upper and lower surfaces of the capacitor, and electrode terminals 11 are provided at both ends to complete the multilayer capacitor 12.

FIGS. 2(a) to 2(c) are perspective views of a protective insulating sheet with a symbol indicating the manufacturing date used in another embodiment of the present invention. That is, the protective insulating sheet 7 with manufacturing date indication used in the embodiment of the present invention shown in FIGS. 1(a) to (g)
Instead, lines with several gaps in the middle are arranged to symbolize the production period. Figure 2 (a) shows that the line ends and sheet ends match the intended intervals for lines of different widths. Fig. 2(b) shows the manufacturing date symbolically by arranging the lines in the same way as in Fig. 2(b). Lines of different widths are arranged at the intended intervals, but the line ends are inside the sheet edge. By stopping, the manufacturing time is symbolized and a laminated concenor is formed using the representation shown in FIG. 2(e). As shown in FIGS. 2(a) to 2(c), it goes without saying that if the production date is symbolized, countless symbols can be used to indicate the production date other than the measuring instruments shown here.

A method of reading the manufacturing date of a multilayer capacitor that incorporates a protective insulating sheet with a manufacturing date indication is to read the manufacturing date indication using X-rays (see Figure 3 (a).
) to (d) and FIGS. 4(a) and (b)) There are two methods: a method of looking at the laminated side surface (FIG. 5), and a method of disassembling the capacitor and looking at the manufacturing date display (not shown).

Figures 3(a) to 3(d) are images obtained by applying X-rays perpendicularly to the laminated surface of a multilayer capacitor (in reality, the electrode 2 and electrode terminal 11
Figure 4(
a) and (b) are images obtained by applying X-rays parallel to the laminated surface (actually, a portion of the electrode terminal 11 is also overlapped in the image, but is not shown). FIG. 5 is a perspective view of the laminated side surface in which a part of the electrode terminal 11 is removed to expose the side surface of the display portion. By any of the above methods, it is possible to read the manufacturing date displayed on the protective insulating sheet during the manufacturing of the multilayer capacitor.

〔Effect of the invention〕

As explained above, since the manufacturing date of the present invention can be displayed inside the non-exposed chip type multilayer capacitor, if a failure occurs after mounting on a glass epoxy printed wiring board or ceramic substrate, the present invention can be used as a normally used method for investigating the cause of the failure. This has the effect that the manufacturing date of each capacitor can be easily determined using the same method (X-ray photography, cross-sectional observation, etc.).

[Brief explanation of the drawing]

Figures 1 (a) to (g) are perspective views of each step to explain the first embodiment of the present invention and its assembly method, and Figures 2 (a), (b), and (c) are respectively Second aspect of the present invention. Third
3(a) to 3(d) are perspective views of protective insulating sheets with markings symbolizing manufacturing times used in the fourth embodiment, and FIGS. 3(a) to 3(d) respectively show the first to fourth embodiments of the multilayer capacitor of the present invention. FIGS. 4(a) and 4(b) are X-ray images of the third and fourth embodiments of the present invention, respectively. (An image obtained by applying X-rays parallel to the laminated surface), Figure 5 is! FIG. 3 is a side view of the laminated structure with a portion of the electrode terminal removed. DESCRIPTION OF SYMBOLS 1... Dielectric sheet, 2... Electrode, 3... Metallized dielectric sheet, 4,8.10...m layer body, 5.9...
・Protective insulation sheet, 6, 13, 14. 15... Combination of numbers and alphabets indicating manufacturing date, barcode, 7... Protective insulation sheet with manufacturing date display, 11.
... Electrode terminal, 12... Multilayer capacitor.

Claims (1)

[Claims] A multilayer capacitor in which multiple dielectric sheets with electrodes formed thereon are laminated, protective insulating sheets are overlaid on both the top and bottom surfaces, and electrode terminals are provided at both ends. Characteristics of non-exposed chip type multilayer capacitors.