Fan cover of computer

Abstract

A fan cover includes a base plate, a frame, and a number of ribs. The frame is made of a number of ring-shaped portions with different diameters and concentrically arranged. A number of strip-shaped portions are radially formed among the ring-shaped portions to connect the ring-shaped portions together. The ribs connect the frame to the base plate at an angle. A number of ventilation holes are defined in the frame.

What is claimed is: 
     
         1 . A fan cover comprising:
 a base plate;   a frame made of a plurality of ring-shaped portions, the ring-shaped portions have different diameters and are concentrically arranged, a plurality of strip-shaped portions radially formed among the ring-shaped portions connect the ring-shaped portions together; and   a plurality of ribs connecting the frame to the base plate at an angle;   wherein a plurality of ventilation holes are defined in the frame.   
     
     
         2 . The fan cover as claimed in  claim 1 , wherein a central hole is defined in the frame. 
     
     
         3 . The fan cover as claimed in  claim 1 , wherein the frame is positioned in another surface parallel to one surface of the base plate. 
     
     
         4 . The fan cover as claimed in  claim 1 , wherein the fan cover is formed by a punch stretch process 
     
     
         5 . An electronic device, comprising:
 a back plate;   a fan including an axle and a plurality of fan blades;   a fan cover formed on the back plate corresponding to the fan; the fan cover comprising:
 a frame defining a central hole and a plurality of ventilation holes; and 
 a plurality of ribs connecting the frame to the back plate at an angle; 
 wherein the central hole corresponds to the axle of the fan, and the ventilation holes correspond to fan blades of the fan. 
   
     
     
         6 . The electronic device as claimed in  claim 5 , wherein the frame is made of a plurality of ring-shaped portions , each ring-shaped portion have a different diameter and the ring-shaped portions are concentrically arranged. 
     
     
         7 . The electronic device as claimed in  claim 6 , wherein a plurality of strip-shaped radial portions are formed among the ring-shaped portions to connect the ring-shaped portions together. 
     
     
         8 . The electronic device as claimed in  claim 5 , wherein the fan cover includes a base plate, the base plate is mounted on an inside of the back plate with fasteners.