Electricity: electrical systems and devices – Electrostatic capacitors – Fixed capacitor
Reexamination Certificate
2007-10-31
2008-12-16
Ha, Nguyen T (Department: 2831)
Electricity: electrical systems and devices
Electrostatic capacitors
Fixed capacitor
C361S321200, C361S306100, C361S306200, C361S311000, C361S313000
Reexamination Certificate
active
07466538
ABSTRACT:
A highly reliable multilayer ceramic electronic device is obtained while preventing crack defects generated in a ceramic laminate by application of a heat shock in a mounting step or the like.The multilayer ceramic electronic device is constructed such that the average value of continuities of internal electrodes located in two regions (f) is lower by 5% to 20% inclusive than the average value of continuities of internal electrodes located in the central portion in a lamination direction. The two regions (f) are the regions from the topmost internal electrode and the bottommost internal electrode located in the lamination direction to the inside, respectively, within 10% of the distance (d) therebetween. Continuity is defined by (X−Y)/X in which X is the length of a cross section of an internal electrode in one direction and Y indicates the sum of gaps (g) formed by pores in the cross section of the internal electrode.
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Written Opinion of the International Searching Authority for International Application No. PCT/JP2006/310303, date mailed Jul. 25, 2006.
Abe Tomoro
Sakamoto Norihiko
Dickstein , Shapiro, LLP.
Ha Nguyen T
Murata Manufacturing Co. Ltd.
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