Patent ID: 6351044
Filing Date: 2002-02-26
Classification: F04D,H01L,H02K,Y10S

Abstract:
A cooling apparatus for an electronic device having a multi-layered mounting board comprising integrally laminated plural printed circuit boards disposed in layers, for mounting at least one heat generating part thereon, said cooling apparatus comprising:a plurality of field coils, respectively arranged on the plural printed circuit boards, each of said plurality of field coils having a beginning and an ending connected by a through hole in one of said printed circuit boards, thereby forming a flat stator; a casing having a first opening, said casing for housing the multi-layered mounting board therein; a cooling fan having a frame, said cooling fan being housed in said casing and being mounted on a same surface of the multi-layered mounting board as the at least one heat generating part, said frame having a longitudinal axis and a first end surface mounted to the multi-layered mounting board; a heat transmission member for thermally connecting the at least one heat generating part with a second end surface of the frame of said cooling fan, said second end surface being disposed at an opposite end of said frame than said first end surface relative to a direction of said longitudinal axis; said cooling fan having (i) a motor comprising said flat stator and a flat rotor, said flat rotor having a surface opposed to a surface of said flat stator, and (ii) a vane extending radially from said flat rotor of said motor relative to said longitudinal axis; said cooling fan being disposed in said casing so that a thickness of said cooling fan in said direction of said longitudinal axis is oriented in a direction of thickness of said casing in said direction of said longitudinal axis; and said frame surrounding an outer periphery of said vane and forming a second opening; wherein said rotor and said stator are mounted on a same side of said multi-layered mounting board.