Abstract:
PROBLEM TO BE SOLVED: To provide a laminated chip electronic component reduced in acoustic noise.SOLUTION: A laminated chip electronic component according to the present invention includes: a ceramic body including internal electrodes and dielectric layers; external electrodes formed to cover both end portions of the ceramic body in a lengthwise direction; an active layer in which the internal electrodes are disposed in an opposing manner, while having the dielectric layers interposed therebetween, to form capacitance; and upper and lower cover layers formed on upper and lower portions of the active layer in a thickness direction, while the lower portion in the thickness direction has a thickness greater than that of the upper portion. When half of the entire thickness of the ceramic body is defined as A, a thickness of the lower cover layer is defined as B, half of the entire thickness of the active layer is defined as C, and a thickness of the upper cover layer is defined as D, the thickness (D) of the upper cover layer satisfies a range of D≥4 μm, a ratio (B+C)/A in which the central portion of the active layer deviates from the central portion of the ceramic body satisfies a range of 1.063≤(B+C)/A≤1.745.
Abstract:
Provided is an electronic circuit device in which the bonding state of electrodes can be detected easily with high precision. The electronic circuit device has a stack structure in which a plurality of electronic circuit boards (1a, 1b, 100a, 100b, 100c) are stacked in three or more layers through ball electrodes (10a, 10b, 20a, 20b) bonded to electrode pads (30a, 30b, 40b, 50a, 60a), wherein the electrode pads are disposed such that transmission shaded images of a pair of the electrode pads provided between adjacent layers partially overlap each other and have a non-overlapping region in which the transmission shaded images of the pair of electrode pads are free from overlapping and such that the transmission shaded image of the non-overlapping region is at least partially free from overlapping with transmission shaded images of all the other electrode pads.
Abstract:
PROBLEM TO BE SOLVED: To provide a battery pack capable of enhancing its reliability by lowering the height of a coupled solder portion when at least two unit cells are coupled in series or parallel with a protection circuit module.SOLUTION: The battery pack comprises a unit cell including a bare cell, an electrode tab extended from the bare cell, a circuit board connected electrically with the electrode tab and a conductive lead projecting from the bare cell and connected electrically with the circuit board. The conductive lead includes a base coupled with the circuit board, and an inserting portion projecting from the base and having a recess or a through hole. The inserting portion projects from the base to pass through an open portion of a protection circuit module including an insulating substrate having the opening portion formed in correspondence with the unit cell.
Abstract:
PROBLEM TO BE SOLVED: To provide a multilayer wiring substrate securely connecting a plurality of different connection objects. SOLUTION: The multilayer wiring substrate 10 includes a multilayered wiring lamination portion 30 formed by alternately laminating a plurality of resin insulation layers 21-24 mainly containing the same resin insulation material and a plurality of conductive layers 26. An IC chip connection terminal 41 of which a connection object is an IC chip and a capacitor connection terminal 42 of which a connection object is a chip capacitor are arranged on an upper surface 31 side of the wiring lamination portion 30. Based on a surface of the resin insulation layer 24 as an outermost layer exposed from the upper surface 31 of the wiring lamination portion 30, the capacitor connection terminal 42 is higher than a reference surface and the IC chip connection terminal 41 is lower than the reference surface. COPYRIGHT: (C)2011,JPO&INPIT