Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1997-10-02
2000-07-04
Picard, Leo P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361749, 361761, 361803, 257686, 257723, 257777, H05K 706
Patent
active
060847808
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a printed-circuit board mounted with a number of electronic components, and to an electronic apparatus provided with the printed circuit board.
BACKGROUND ART
In recent years, printed-circuit boards each comprising a printed-wiring board and a number of electronic components mounted on the board are used in increasing numbers, in electronic apparatuses such as personal computers. Generally, a printed-wiring board has a conductor pattern including a number of connection pads. Electronic components are mounted on the printed-wiring board, with their connection terminals soldered to the connection pads.
Recently, electronic apparatuses are made smaller and designed to have better performance. Printed-circuit boards for use in these apparatuses must therefore be small and must acquire high performance.
The smaller a printed-circuit board, the smaller its area. Nonetheless, more electronic components must be mounted to achieve higher performance. There is a limit to the density at which electronic components can be mounted. Thus it is difficult, in some cases, to mount all required components on the printed-wiring board. If so, it is impossible to miniaturize the printed-circuit board any more.
DISCLOSURE OF THE INVENTION
The present invention has been made in view of the foregoing, and its object is to provide a printed-circuit board which has electronic components mounted at a high density and which is smaller than conventional ones, and to provide an electronic apparatus provided with the same.
To attain the object mentioned above, a printed-circuit board according to the invention comprises: a main printed-wiring board having a first conductor pattern; a first electronic component mounted on the main printed-wiring board and electrically connected to the first conductor pattern; an auxiliary printed-wiring board mounted on the main printed-wiring board, covering the first electronic component, and having a second conductor pattern electrically connected to the first conductor pattern; and a second electronic component mounted on the auxiliary printed-wiring board and electrically connected to the second conductor pattern.
A printed-circuit board according to the invention comprises: a main printed-wiring board having a first conductor pattern; a first electronic component mounted on the main printed-wiring board and electrically connected to the first conductor pattern; and a component unit including an auxiliary printed-wiring board having a second conductor pattern, and a second electronic component mounted on the auxiliary printed-wiring board and electrically connected to the second conductor pattern. The component unit is mounted on the main printed-wiring board, covering the first electronic component, and the second conductor pattern is electrically connected to the first conductor pattern.
As described above, the auxiliary printed-wiring board on which the second electronic component is arranged, covering the first electronic component. The first and second electronic components are thus mounted in three-dimensional fashion. Hence, many electronic components can be mounted at a high density.
Moreover, an electronic apparatus according to the present invention comprises: a housing; input means provided on the housing, for inputting information; display means provided on the housing, for displaying information; and a printed-circuit board arranged in the housing. The printed-circuit board includes: a main printed-wiring board having a first conductor pattern; a first electronic component mounted on the main printed-wiring board and electrically connected to the first conductor pattern; an auxiliary printed-wiring board mounted on the main printed-wiring board, covering the first electronic component, and having a second conductor pattern electrically connected to the first conductor pattern; and a second electronic component mounted on the auxiliary printed-wiring board and electrically connected to the second conductor patterns.
BRIEF DESCRIPT
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Kabushiki Kaisha Toshiba
Picard Leo P.
Vigushin John B.
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