Computer enclosure

Abstract

A computer enclosure includes a rear plate. The rear plate defines a plurality of ventilation holes therein. A first rib, a second rib and a third rib is located on the rear plate. The first rib surrounds the ventilation holes. The third rib surrounds the first and second ribs.

What is claimed is: 
     
         1 . A computer enclosure comprising:
 a rear plate defining a plurality of ventilation holes therein, a first rib, a second rib and a third rib being located on the rear plate; wherein the first rib surrounds the ventilation holes; the third rib surrounds the first and second ribs.   
     
     
         2 . The computer enclosure of  claim 1 , wherein the first rib forms a generally rectangular shape. 
     
     
         3 . The computer enclosure of  claim 1 , wherein the second rib forms a generally rectangular shape. 
     
     
         4 . The computer enclosure of  claim 1 , wherein a flange is bent from an edge of the rear plate, and at least one rolled piece is formed on the flange. 
     
     
         5 . The computer enclosure of  claim 1 , wherein a retaining piece is bent from the rear plate, so that the rear plate defines a power supply opening therein. 
     
     
         6 . The computer enclosure of  claim 5 , wherein the computer enclosure further comprises a bottom plate perpendicular to the rear plate; the retaining piece is secured to the bottom plate. 
     
     
         7 . The computer enclosure of  claim 5 , wherein at least one protrusion is located on rear plate adjacent a corner of the power supply opening. 
     
     
         8 . The computer enclosure of  claim 1 , wherein the rear plate is made of 0.4 mm metal plate. 
     
     
         9 . A computer enclosure comprising:
 a rear plate with a first rib, a second rib and a third rib located thereon; wherein the first and second ribs form a generally rectangular shape respectively; and the third rib surrounds the first rib and the second rib.   
     
     
         10 . The computer enclosure of  claim 9 , wherein a flange is bent from an edge of the rear plate, and at least one rolled piece is formed on the flange. 
     
     
         11 . The computer enclosure of  claim 9 , wherein a retaining piece is bent from the rear plate, so that the rear plate defines a power supply opening therein. 
     
     
         12 . The computer enclosure of  claim 11 , wherein the computer enclosure further comprises a bottom plate perpendicular to the rear plate; the retaining piece is secured to the bottom plate. 
     
     
         13 . The computer enclosure of  claim 11 , wherein at least one protrusion is located on rear plate adjacent a corner of the power supply opening. 
     
     
         14 . The computer enclosure of  claim 9 , wherein the rear plate is made of 0.4 mm metal plate. 
     
     
         15 . The computer enclosure of  claim 9 , wherein a plurality of ventilation holes is defined in the rear plate and surrounded by the first rib.