Rotary current-collecting device and rotating anode X-ray tube

Abstract

A rotary current-collecting device includes a rotary slip ring and brushes coming into sliding contact with the outer peripheral surface of the slip ring. The brush-holding ring has an inner surface to which three brush-holding springs are fixed by screws. Each of the brushes is fixed to the tip end of the brush-holding spring and is pushed against the outer surface of the slip ring under the resilient restoration force of the brush-holding spring. When the slip ring revolves, the brushes come into sliding contact with the outer peripheral surface of the slip ring. The brush is made of a metal-graphite compound consisting of 70 weight percent copper and 30 weight percent graphite. The slip ring is entirely made of glassy carbon, so that the brush abrasion can be reduced.

1 . A rotary current-collecting device includes a combination of a rotary collector having an outer peripheral surface comprising at least a part of a cylindrical surface and one or more brushes which come into sliding contact with said outer peripheral surface of said collector, wherein: 
 at least said outer peripheral surface of said collector is made of glassy carbon.    
   
   
       2 . A rotary current-collecting device according to  claim 1 , wherein said collector comprises a slip ring.  
   
   
       3 . A rotary current-collecting device according to  claim 1 , wherein said collector is entirely made of said glassy carbon.  
   
   
       4 . A rotary current-collecting device according to  claim 1 , wherein said collector includes a cylindrical metal base having an outer peripheral surface which is covered with a layer of glassy carbon.  
   
   
       5 . A rotary current-collecting device according to  claim 1 , wherein said brushes are made of graphite.  
   
   
       6 . A rotary current-collecting device according to  claim 1 , wherein said brushes are made of a metal-graphite compound.  
   
   
       7 . A rotary current-collecting device according to  claim 6 , wherein said metal-graphite compound consists of copper and graphite.