Small-size magnetic disk drive mechanism with hermetically sealed chamber

Abstract

A magnetic disk drive mechanism has a magnetic disk, a magnetic disk drive motor for rotating the magnetic disk, a magnetic head for recording and reproducing information on and from the magnetic disk, and a chassis defining a hermetically sealed chamber which houses the magnetic disk, the magnetic disk drive motor, and the magnetic head therein. Printed wire patterns are disposed on a surface of a flat stator base of the motor which faces into the hermetically sealed chamber, the printed wire patterns having terminals extending out of the hermetically sealed chamber. An O-ring is interposed between the chassis and the stator base, for hermetically sealing the terminals from the hermetically sealed chamber.

What is claimed is: 
     
       1. A magnetic disk drive mechanism comprising: a magnetic disk;   a magnetic disk drive motor for rotating said magnetic disk, said magnetic disk drive motor including a stator having drive coils and a flat stator base and a rotor rotatable with respect to said stator, said flat stator base having printed wire patterns which are connected to said drive coils;   a magnetic head for recording and reproducing information on and from said magnetic disk;   a chassis having a hole, said channels defining a hermetically sealed chamber with said hole hermetically closed by said flat stator base, said hermetically sealed chamber accommodating said magnetic disk, said magnetic disk drive motor, and said magnetic head therein, said printed wire patterns being disposed on a surface of said flat stator base which faces into said hermetically sealed chamber, said printed wire patterns comprising first terminals to which said drive coils are connected in said hermetically sealed chamber and portions extending out of said hermetically sealed chamber and ending in second terminals which remain outside; and   seal means, interposed between said channels and said flat stator base and extending around said rotor, for sealing said hermetically sealed chamber from said second terminals.   
     
     
       2. A magnetic disk drive mechanism according to claim 1, wherein said seal means comprises an O-ring which is formed to have a profile which is substantially the same as the outer profile of said rotor. 
     
     
       3. A magnetic disk drive mechanism according to claim 2, wherein said O-ring extends across said printed wire patterns. 
     
     
       4. A magnetic disk drive mechanism according to claim 1, wherein said flat stator base comprises a printed-circuit baseboard which is made of iron, said printed wire patterns being mounted on said printed-circuit baseboard. 
     
     
       5. A magnetic disk drive mechanism according to claim 1, wherein said flat stator base is fastened to a surface of said chassis which is remote from said hermetically sealed chamber. 
     
     
       6. A magnetic disk drive mechanism according to claim 1, wherein said chassis has a clearance defined in a lower surface thereof where said seal means crosses over said printed wire patterns, and said wire patterns lie in said clearance out of electric contact with said chassis. 
     
     
       7. A magnetic disk drive mechanism according to claim 1, further including a wire assembly soldered at one end thereof to said terminals, and a presser resiliently pressed between said terminals and said chassis. 
     
     
       8. A magnetic disk drive mechanism according to claim 1, further including a frequency generator for detecting the rotational speed of said rotor and a pulse generator for detecting the phase of angular displacement of said rotor, said frequency generator and said pulse generator being mounted on said stator base and said rotor. 
     
     
       9. A magnetic disk drive mechanism according to claim 1, wherein said printed wire patterns include electrically conductive means, disposed on and along said surface of said flat stator base, for electrically connecting at least one of said first terminals and at least one of said second terminals to each other. 
     
     
       10. A magnetic disk drive mechanism comprising: a magnetic disk;   a magnetic disk drive motor for rotating said magnetic disk, said magnetic disk drive motor including a stator having drive coils and a stator base and a rotor rotatable with respect to said stator, said rotor including a rotatable shaft rotatably supported by said stator base, said stator base having printed wire patterns which are connected to said drive coils and disposed in confronting relationship to said rotor in an area radially outward of said rotatable shaft;   a magnetic head for recording and reproducing information on and from said magnetic disk; and   a chassis having a hole, said chassis defining a hermetically sealed chamber with said hole hermetically closed by said stator base, said hermetically sealed chamber accommodating said magnetic disk, said magnetic disk drive motor, and said magnetic head therein, said printed wire patterns including terminals to which said drive coils are connected in said hermetically sealed chamber, terminal means positioned outside of said hermetically sealed chamber, and electrically conductive means extending on and along said stator base and between said rotor and said stator, said electrically conductive means having ends connected to said terminals in said hermetically sealed chamber and opposite ends connected to said terminal means. .Iadd.   
     
     
       11.  A magnetic disk drive mechanism comprising: a casing including a chassis and a stator base defining a hermetically sealed chamber therein;   a magnetic disk arranged in said chamber;   a magnetic disk drive motor arranged in said chamber and holding said magnetic disk at its center for rotating said magnetic disk, said motor including a cup-shaped rotor case, said rotor having a magnet mounted to an inner peripheral surface thereof and a center shaft rotatably supported by bearing means which is held by said casing, said rotor having a radial outer edge relative to said center shaft, said radial outer edge facing said casing with a first small gap therebetween, said motor further including a stator core held by said casing, said stator core disposed with a second small gap from said magnet and having drive coils therearound;   a magnetic head arranged in said chamber for recording and reproducing information on and from said magnetic disk;   electrically conductive means connected to said drive coils for supplying drive signals to said cupshaped rotor, said electrically conductive means extending from said drive coils to be drawn out, being converged, through said first small gap and along said casing, said electrically conductive means extending out of said hermetically sealed chamber through said casing at a location remote from said drive coils. .Iaddend. .Iadd.12. A magnetic disk drive mechanism according to claim 11, wherein said motor includes said stator base which holds said bearing means and said stator core, said stator base forming a portion of said casing. .Iaddend. .Iadd.13. A magnetic disk drive mechanism according to claim 12, wherein seal means for defining said hermetically sealed chamber is provided for forming a further portion of said casing. .Iaddend. .Iadd.14. A magnetic disk drive mechanism according to claim 11, wherein said electrically conductive mean extends along said stator base to be drawn out through   
     
     
        said first small gap. .Iaddend. .Iadd.15.  A magnetic disk drive mechanism according to claim 14, wherein said electrically conductive means is fixed to said stator base. .Iaddend. .Iadd.16. A magnetic disk drive mechanism according to claim 11, wherein said electrically conductive means is fixed to said casing. .Iaddend. .Iadd.17. A magnetic disk drive mechanism according to claim 11, wherein said electrically conductive means comprises printed wire patterns. .Iaddend.