Magnetic storage recording medium and magnetic recording and playback device

Abstract

A pair of reels of a magnetic cassette tape and a pair of reel supports of a magnetic tape drive comprise a conductive material as an antistatic treatment. Further, a head substrate and a projection substrate of a head drum comprise a conductive material having a resistance of 1×10 10 Ω or less and are connected to a metal base so as to be at the ground potential via the metal base and a rotating drum. These antistatic treatments allow static electricity charged on a magnetic tape to be discharged to the head substrate and the protection substrate without flowing to a magneto-resistive (MR) element, thereby preventing the electrostatic discharge breakdown of the MR element.

What is claimed is:  
     
         1 . A magnetic storage medium from and to which information is read and written by a magneto-resistive head, comprising: 
 a magnetic tape; and    a pair of reels for winding and rewinding the magnetic tape,    wherein the reels are provided with an antistatic treatment.    
     
     
         2 . The magnetic storage medium according to  claim 1 , wherein the reels comprise a conductive material as the antistatic treatment.  
     
     
         3 . The magnetic storage medium according to  claim 2 , wherein the reels are connected to the ground when the magnetic storage medium is loaded in a magnetic recording and playback device.  
     
     
         4 . The magnetic storage medium according to  claim 2 , wherein the conductive material has a surface-resistance ranging from 0 Ω/inch 2  to 1×10 12  Ω/inch 2 .  
     
     
         5 . The magnetic storage medium according to  claim 2 , wherein the conductive material comprises a metal.  
     
     
         6 . The magnetic storage medium according to  claim 1 , wherein the reels comprise antistatic films formed on the surfaces thereof as the antistatic treatment.  
     
     
         7 . The magnetic storage medium according to  claim 6 , wherein the antistatic films formed on the surfaces of the reels are connected to the ground when the magnetic storage medium is loaded in a magnetic recording and playback device.  
     
     
         8 . The magnetic storage medium according to  claim 6 , wherein the antistatic films have a surface-resistance ranging from 0 Ω/inch 2  to 1×10 12  Ω/inch 2 .  
     
     
         9 . The magnetic storage medium according to  claim 6 , wherein the antistatic films are metal films.  
     
     
         10 . A magnetic recording and playback device comprising: 
 a magneto-resistive head; and    a pair of reel supports for supporting a pair of reels of a magnetic storage medium loaded in the magnetic recording and playback device,    wherein the reel supports are provided with an antistatic treatment.    
     
     
         11 . The magnetic recording and playback device according to  claim 10 , wherein at least one part of the reel supports comprises a conductive material as the antistatic treatment.  
     
     
         12 . The magnetic recording and playback device according to  claim 11 , wherein at least one part of the reel supports is connected to the ground.  
     
     
         13 . The magnetic recording and playback device according to  claim 11 , wherein the conductive material has a surface-resistance ranging from 0 Ω/inch 2  to 1×10 12  Ω/inch 2 .  
     
     
         14 . The magnetic recording and playback device according to  claim 11 , wherein the conductive material comprises a metal.  
     
     
         15 . The magnetic recording and playback device according to  claim 10 , wherein at least one part of the reel supports comprises an antistatic film formed on the surface thereof as the antistatic treatment.  
     
     
         16 . The magnetic recording and playback device according to  claim 15 , wherein the antistatic film formed on the surface of at least one part of the reel supports is connected to the ground.  
     
     
         17 . The magnetic recording and playback device according to  claim 15 , wherein the antistatic film has a surface-resistance ranging from 0 Ω/inch 2  to 1×10 12  Ω/inch 2 .  
     
     
         18 . The magnetic recording and playback device according to  claim 15 , wherein the antistatic film is a metal film.  
     
     
         19 . A head drum for reading and writing information from and to a magnetic tape, the head drum comprising: 
 a conductive rotating drum at the ground potential, the magnetic tape being wound in a helical manner around the rotating drum;    a metal base fixed inside the rotating drum and electrically connected to the rotating drum; and    a magnetic head fixed to the metal base, the magnetic head comprising: 
 a head substrate and a protection substrate, both having a resistance of 1×10 10  Ω or less and electrically connected to the metal base;  
 a pair of outer insulating films disposed between the head substrate and the protection substrate; and  
 a pair of magnetic shielding films disposed between the pair of outer insulating films;  
 a pair of inner insulating films disposed between the pair of magnetic shielding films; and  
 a magneto-resistive head element, disposed between the pair of inner insulating films, for reading stored signals by contacting the magnetic tape.  
   
     
     
         20 . The head drum according to  claim 19 , wherein the head substrate and the protection substrate comprise one of Al 2 O 3 —TiC and MnZn ferrite.  
     
     
         21 . The head drum according to  claim 19 , wherein the head substrate and the protection substrate are electrically connected to the metal base with a conductive paste.  
     
     
         22 . The head drum according to  claim 19 , wherein either one of the head substrate and the protection substrate has a resistance of 1×10 10  Ω or less and is electrically connected to the metal base.  
     
     
         23 . A magnetic recording and playback device for recording and reading signals by using a magnetic tape, the magnetic recording and playback device comprising a head drum, the head drum comprising: 
 a conductive rotating drum at the ground potential, the magnetic tape being wound in a helical manner around the rotating drum;    a metal base fixed inside the rotating drum and electrically connected to the rotating drum; and    a magnetic head fixed to the metal base, the magnetic head comprising: 
 a head substrate and a protection substrate, both having a resistance of 1×10 10  Ω or less and electrically connected to the metal base;  
 a pair of outer insulating films disposed between the head substrate and the protection substrate; and  
 a pair of magnetic shielding films disposed between the pair of outer insulating films;  
 a pair of inner insulating films disposed between the pair of magnetic shielding films; and  
 a magneto-resistive head element, disposed between the pair of inner insulating films, for reading stored signals by contacting the magnetic tape.