Multilayer Ceramic Capacitors
A technology of ceramic capacitors and capacitors, applied in the direction of multilayer capacitors, capacitors, fixed capacitors, etc., can solve the problem of reducing the moisture resistance of the capacitor body, and achieve the effect of reducing the moisture resistance.
Active Publication Date: 2021-03-12
TAIYO YUDEN KK
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[0005] However, since dimensional tolerances cannot be avoided during the fabrication of the above-mentioned dielectric layer, even if it is assumed that a design is adopted that does not create a gap between the expansion portion of each external electrode and the above-mentioned dielectric layer, in fact, the expansion portion of each external electrode Manufactured in a mixed state with substances that open gaps between the above-mentioned dielectric layers and substances that do not open gaps
[0006] That is, the substance that creates a gap between the extended portion of each external electrode and the above-mentioned dielectric layer has a substantial difference in height of the capacitor body between the portion with the gap and the portion without the gap, and the portion with the gap becomes easy for moisture to infiltrate into the capacitor. part inside the body, so there is another concern that the moisture resistance of the capacitor body will decrease
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[0051] First, use Figure 1 ~ Figure 4 , the structure of the multilayer ceramic capacitor 10 to which the present invention is applied will be described. In this description, the figure 1 The left-right direction of is recorded as the length direction, and the figure 1 The up and down direction of is recorded as the width direction, and the figure 2 The up-and-down direction of is denoted as the height direction, and the dimensions along these lengthwise, widthwise and height directions, respectively, are denoted as length, width and height.
[0052] Figure 1 ~ Figure 4 The dimensions of the illustrated laminated ceramic capacitor 10 are specified by a length L, a width W and a height H. As shown in FIG. For reference, as Figure 1 ~ Figure 4 The actual dimensions of the length L, width W and height H of the first test piece of the foundation are 600 μm, 300 μm and 300 μm respectively, and the actual dimensions of the length L, width W and height H of the second test p...
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Abstract
Even if at least one surface in the height direction of the capacitor main body has a dielectric layer covering a portion between the extensions of each external electrode, it is possible to reduce moisture resistance due to a gap between the extensions of each external electrode and the dielectric layer. The laminated ceramic capacitor (10) has two layers in the height direction covering the capacitive element (11') in such a manner as to leave a gap (CL) between the first base conductor film (11c) and the first base conductor film (11c). The auxiliary dielectric layer (11d) on the portion between the respective two first base conductor films (11c), each external electrode (12, 13) has a second base conductor film (12a, 13a) and a surface conductor film (12b , 13b), the extended portion (12b1, 13b1) of each surface conductor film (12b, 13b) has an insertion portion (12b2, 13b2) embedded in the gap (CL).
Description
technical field [0001] The present invention relates to a multilayer ceramic capacitor in which an external electrode has an extended portion extending to at least one surface of a capacitor body in the height direction. Background technique [0002] The dimensions of a multilayer ceramic capacitor are defined by length, width, and height, where the height refers to the dimension along the stacking direction of the internal electrode layers. In addition, a laminated ceramic capacitor generally includes: a capacitor body having a substantially rectangular parallelepiped shape having a capacitor portion in which a plurality of internal electrode layers are stacked via a dielectric layer; A pair of external electrodes in which electrode layers are alternately connected, and each external electrode has an expanded portion extending to at least one surface in the height direction of the capacitor body. [0003] However, although not only an increase in capacitance but also a red...
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IPC IPC(8): H01G4/232H01G4/30
CPCH01G4/232H01G4/30H01G2/103H01G2/12H01G4/008H01G4/1209H01G4/224H01G4/306
Inventor 佐藤壮饭岛淑明笹木隆
Owner TAIYO YUDEN KK