Abstract:
PROBLEM TO BE SOLVED: To provide an electronic component module comprising a circuit board (in particular, a high-frequency board) in which the shielding effect of a ground plane is not impaired and in which warpage and twist on account of reflow soldering are suppressed, and to provide a circuit board thereof. SOLUTION: The electronic component module includes: the circuit board having an insulating layer, a plurality of conductive layers formed on respective surfaces of the insulating layer, a ground plane comprising one of the conductive layers and covering the greater part of the surface, and wiring formed on another of the surfaces and comprising the conductive layer; and an electronic component mounted on the circuit board and connected by the wiring, wherein a plurality of slits, formed by removing the conductive layer, are provided in the ground plane. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an electromagnetic bandgap structure and a printed circuit board that solve a mixed signal problem between an analog circuit and a digital circuit, the electromagnetic bandgap structure having a low bandgap frequency although having a small size. SOLUTION: The electromagnetic bandgap structure includes a mushroom type structure 360 comprising a first metal plate 350 and a via 340 of which one end is connected to the first metal plate 350; a second metal plate 330a connected to the other end of the via 340; a first metal layer 330b being connected to the second metal layer 330a through a metal line 333; a first dielectric layer 320a stacked between the first metal layer 330b and the first metal plate 350; a second dielectric layer 320b stacked on the first metal plate 350 and the first dielectric layer 320a; and a second metal layer 310 stacked on the second dielectric layer 320b. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To obtain a printed wiring board with which bonding strength of a bump and a pad is improved. SOLUTION: The printed wiring board 15 has a plurality of pads 35 to which bumps 25 are bonded. The pads 35 are independent of each other and are formed of a plurality of corresponding conductors 32a and 32b with respect to a single bump 25. A clearance g1, into which a portion of the bump 25 enters when the bump 25 is bonded to the pad 35, is provided between the plurality of conductors 32a and 32b. COPYRIGHT: (C)2008,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an electronic apparatus whose mounting efficiency of a printed circuit board can be improved. SOLUTION: A plurality of terminals 324 exposed from a main body 326 having an IC chip 323 in QFN320a inside are electrically connected to a plurality of lands 311 corresponding to the terminals arranged on the printed board 310. A reinforcing part 321 exposed from a face confronted with the printed board in the main body 326 is mechanically connected to a reinforcing land 312 installed on the printed board. Thus, QFN320a is surface-mounted on the printed board 310 in the electronic apparatus 100. The printed board 310 has a plurality of wirings 317 corresponding to a plurality of lands 311. A plurality of wirings 317 comprise wiring 317 arranged in a region confronted with at least the main body 326. The reinforcing land 312 has a shape corresponding to wiring 317 installed in the region confronted with the main body 326. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
A printed circuit board comprising a plurality of lands onto which a plurality of leads of an electronic component are soldered. These lands are arrayed in parallel one another. Each of these lands includes a narrow portion basically extending in a longitudinal direction thereof and having a predetermined constant width, and a wide portion protruding laterally from both edges of the narrow portion.
Abstract:
PROBLEM TO BE SOLVED: To provide a land grid array package which can suppress short-circuiting or disconnection. SOLUTION: In the land grid array package, an element-side ground electrode 6, a substrate-side ground electrode 9, an element-side peripheral electrode 7, and a substrate-side peripheral electrode 10 are soldered with eutectic solder 16. A degassing through-hole 15 passed through a mounting board 3 is formed in a soldering region 18 of the element-side ground electrode 6. COPYRIGHT: (C)2005,JPO&NCIPI