Patent ID: 6292363
Filing Date: 2001-09-18
Classification: H02M,H05K

Abstract:
A servo-amplifier, comprising:a semiconductor module;a first printed circuit board on which the semiconductor module and components are mounted;a second printed circuit board on which the semiconductor module is not mounted and on which components are mounted; anda unit case accommodating said semiconductor module, said first printed circuit board and said second printed circuit board,wherein said first printed circuit board and said second printed circuit board are placed opposite to each other, a heat radiating surface of said semiconductor module, said first printed circuit board and said second printed circuit board are arranged parallel to inner wall faces of the unit case, respective heights of each of the components mounted on said first printed circuit board and said second printed circuit board are equal to or smaller than a thickness of said semiconductor module, a sum of heights of components positioned in confronting relation with each other on said first printed circuit board and second printed circuit board are equal to or smaller than the thickness of said semiconductor module, and a distance between the inner walls of said unit case is substantially equal to a sum of thicknesses of said semiconductor module and said first printed circuit board.