Abstract: A cooling fan comprises a rotor, a stator, a circuit board, a base, and a magnetic plate wherein rotor includes blades, a magnetic recess, and a shaft; stator has posts; circuit board has apertures corresponding to the posts; and base includes a bearing and a sleeve. Posts of stator are inserted into apertures of circuit board, shaft of rotor is inserted through stator and circuit board to secure in the bearing of base, and magnetic plate is located between stator and circuit board corresponding to and lower than magnetic recess of rotor by a gap, and is spaced apart from the poles of stator. By utilizing this, a cooling fan with anti deflection capability, enhanced performance, and prolonged life is effected.

Abstract: A brushless fan comprises a rotor assembly, a stator assembly, a frame, a retaining ring, and an oil ring. Concentric inner and outer slopes are provided at bottom of shaft housing for supporting bearing and stator assembly. As such, bearing and stator assembly precisely position with respect to shaft housing for obtaining an optimum magnetization, whereby shaft can stably rotate under the influence of magnetic field of rotor. Lubricating oil reservoir is provided between bearing and the top of shaft housing. Oil ring and projected cylindrical member are provided on top of shaft housing being oblique with respect to each other and separated by a minimum gap, thereby sealing the oil reservoir. With this, lubricating oil is prevented from spilling when rotor is rotating. Further a larger oil storage space and the omission of washer are effected.

Abstract: A CPU heat sink mounting structure including two heat sink fasteners fastened to a heat sink and a CPU holder at two opposite sides to hold them together, each heat sink fastener including a clamping plate having a vertical screw hole disposed in vertical alignment with a vertical through hole in a transverse channel at one side of the heat sink and a coupling hole disposed outside the heat sink and forced into engagement with a retainer block at one side of the CPU holder, a screw bolt slidably inserted into the vertical through of the transverse channel and threaded into the vertical screw hole of the clamping plate, and spring means mounted in the transverse channel of the heat sink and imparting an upward pressure to the clamping plate and the screw bolt.