Cooling fan with light-emitting device

#1. Field of the Invention

#The present invention relates to a cooling fan, and more particularly to a cooling fan with light-emitting device.

#2. Description of Related Art

#FIG. 1 is a perspective view of a cooling fan with a light-emitting device in accordance with the present invention;

#FIG. 2 is an exploded perspective view of the cooling fan in FIG. 1;

#FIG. 3 is a side plan view in partial section of the cooling fan in FIG. 1;

#With reference to FIGS. 1 to 4, a cooling fan with a light-emitting device in accordance with the present invention comprises a frame (7), multiple light emitting diodes (LIED) (13), a circuit board (10), a stator (6), an impeller (1) and multiple permanent magnets (5). The frame (7) with a center comprises a housing (8) and a stud (9). The housing (8) has multiple LED holes (12) formed in and pass through the housing (8). The stud (9) is perpendicularly extrudes from the center of the frame (8). The impeller (1) with a center comprises a round casing (2), a shaft (3) and multiple blades (4). The casing (2) has an inside-perimeter. The multiple permanent magnets (5) formed around the inside-perimeter of the casing (2) are arc-shaped and each has multiple poles (not shown). The shall (3) is formed in the center of the impeller (1). The circuit board (10) is round in shape with a center portion punched out to go through the stud (9). The stator (6) has multiple coils, which are securely wound around the stud (9) and is electrically connected to the circuit board (10). With the shaft (3) go through the stator (6) and into the stud (9), the impeller (1) sits inside the housing (8) of the frame (7) with the stator (6) completely surround by the permanent magnets (5) inside the casing (2). The impeller (1) is rotated by the interaction force between the magnetic forces generated by the stator (6) and the permanent magnets (5).

#Each light emitting diode (LEDs) (13) is mounted inside one of the LED holes (12) on the housing (8) pointing inwards to the impeller (1). The rotational of the impeller (1) is controlled by a drive circuit (not shown) on the circuit board (10), and the multiple LEDs (13) are powered by the same circuit board (10) or an outside circuit board (tot shown). Each LED (13) projects light towards the impeller (1) and to the frame (7) so the light will reflects and bounces all over the fan. When the frame (7) and the impeller (1) are transparent or translucent, the light will produce a fantastic visual effect so the whole fan will glow in the dark.

#Please refer to FIG. 5. The LEDs (13) are connected to the same power source connected to the drive circuit that controls the impeller (1). The drive circuit comprises a driving IC (22), a power source (not numbered), stator coils (L1, L2) and isolation capacitors (C1, C2). The driving IC (22) has a power input terminal (not numbered), a ground terminal (not numbered) and two input terminals (not numbered). The power input terminal is connected a power unit (not numbered), and the input terminals are connected respectively to the stator coils (L1, L2). The power source provides the power to the driving IC (22), and the driving IC (22) will control the two input terminals to selectively allow electricity to flow through the stator coils (L1, L2) and switch the electromagnetic poles in the stator (6). The isolation capacitor (C1, C2) will provide discharge, charge and wave filter function. The power unit is also connected to the multiple LEDs (13) so when the power rotates the fan (1) and the LED (13) illuminate.