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Multiple zone multiple disk video recording system

  • US 4,577,240 A
  • Filed: 11/15/1982
  • Issued: 03/18/1986
  • Est. Priority Date: 11/15/1982
  • Status: Expired due to Fees
First Claim
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1. A video disk recording system for video signals including synchronization pulses defining fields, said signals being formed into a parallel digitized data stream comprisinga plurality M of recording disks mounted for coordinate movement,a servo disk,spindle means for mounting said disks for rotation in common about a single axis, said recording disks and servo disk having a plurality of data impressionable recording surfaces thereon,said servo disk carrying a set of once-around reference pulses for establishing a position synchronizing signal to which all said data tracks are physicially and electrically synchronized,motor means for rotating the spindle at an approximate speed for synchronizing the video pulses with the once-around reference pulses,means forming a first plurality (A) of read/write heads and a servo reading head associated with said recording surfaces respectively,actuator means (A) for mounting said first plurality of heads and including arm means for carrying said heads over each respective disk surface in a first zone (A),means forming second plurality (B) of read/write heads and a servo head associated with said recording surfaces respectively,actuator means (B) independent of said first actuator means for mounting said second plurality of heads, and including second arm means for carrying said heads over each respective recording surface in a second zone (B) independently of said first zone (A),means for incrementally adjusting the speed of said motor means to change the phase orientation while maintaining the disk at approximately the speed and overall lock to reference until a once-around reference pulse are received in coincidence with the incoming video sync,means including a coincidence detector for latching the system when coincidence occurs,means for recording alternate fields of video data on said first and second zones respectively, the actuator means of one zone performing track search functions while the actuator and heads of the other zone are reading or writing,whereby video recording proceeds as that each video field is recorded one of a series of single cylinders defined collectively by a set of tracks on the recording disk surfaces taken together and alternating zone (B) between zone (A) and surfaces taken together.

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