Magneto-optical recording medium having pairs of mutually corresponding recording segments, and apparatus for recording information on the medium
First Claim
1. A magneto-optical recording apparatus for writing information on a magneto-optical recording medium, wherein the improvement comprises:
- said magneto-optical recording medium having at least one pair of magneto-optical storage layers each pair consisting of a first storage layer and a second storage layer, said first and second storage layers having at least one pair of corresponding recording segments, each of said at least one pair of mutually corresponding recording segments consisting of a first recording segment provided on said first storage layer and a second recording segment provided on said second storage layer;
first writing/erasing means for writing and erasing information on said first storage layer;
second writing/erasing means for writing and erasing information on said second storage layer; and
recording control means connected to said first and second writing/erasing means, for activating one of said first and second writing/erasing means to erase previous information already recorded on corresponding one of said first and second recording segments of said each pair of corresponding recording segments, while activating the other of said first and second writing/erasing means to write first new information on the other of said first and second recording segments,upon reception of a command to write second new information, said recording control means activating said other writing/erasing means to erase said first new information recorded on said other of said first and second recording segments, while activating said one writing/erasing means to write said second new information on said one of said first and second recording segments.
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Accused Products
Abstract
A magneto-optical recording apparatus for writing information on a magneto-optical recording medium having at least one pair of magneto-optical storage layers each pair consisting of a first and a second storage layer which have at least one pair of corresponding recording segments, each pair of mutually corresponding recording segments consisting of a first recording segment provided on the first storage layer and a second recording segment provided on the second storage layer. The apparatus includes a first and a second writing/erasing head for writing and erasing information on the first and second storage layers, and a recording controller for activating one of the first and second writing/erasing heads to erase previous information already recorded on corresponding one of the first and second recording segments, while activating the other head to write first new information on the other of the first and second recording segments. Upon reception of a command to write second new information, the recording control means activating the above-indicated other head to erase the first new information recorded on the above-indicated other recording segment, while activating the above-indicated one head to write the second new information on the above-indicated one recording segment.
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Citations
13 Claims
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1. A magneto-optical recording apparatus for writing information on a magneto-optical recording medium, wherein the improvement comprises:
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said magneto-optical recording medium having at least one pair of magneto-optical storage layers each pair consisting of a first storage layer and a second storage layer, said first and second storage layers having at least one pair of corresponding recording segments, each of said at least one pair of mutually corresponding recording segments consisting of a first recording segment provided on said first storage layer and a second recording segment provided on said second storage layer; first writing/erasing means for writing and erasing information on said first storage layer; second writing/erasing means for writing and erasing information on said second storage layer; and recording control means connected to said first and second writing/erasing means, for activating one of said first and second writing/erasing means to erase previous information already recorded on corresponding one of said first and second recording segments of said each pair of corresponding recording segments, while activating the other of said first and second writing/erasing means to write first new information on the other of said first and second recording segments, upon reception of a command to write second new information, said recording control means activating said other writing/erasing means to erase said first new information recorded on said other of said first and second recording segments, while activating said one writing/erasing means to write said second new information on said one of said first and second recording segments. - View Dependent Claims (2, 3, 4)
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5. A magneto-optical recording apparatus for writing information on a magneto-optical recording medium, wherein the improvement comprises:
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said magneto-optical recording medium having at least one pair of magneto-optical storage layers each pair consisting of a first storage layer formed on one of opposite sides thereof, and a second storage layer formed on the other side thereof; a first optical head disposed opposite to said one side of said recording medium for writing information on said first storage layer, said first optical head including a first magnetizing coil and having a first focal point on said first storage layer; a second optical head disposed opposite to said other side of said recording medium for writing information on said second storage layer, said second optical head having a second magnetizing coil and including a second focal point on said second storage layer; first positioning means for positioning said first optical head such that said first focal point is moved along a first path parallel to said first storage layer; and second positioning means for positioning said second optical head such that said second focal point is moved along a second path parallel to said second storage layer, said first and second paths extending so as not to intersect each other in a plane parallel to a plane of said recording medium. - View Dependent Claims (6, 7, 8)
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9. A magneto-optical recording apparatus for writing information on a magneto-optical recording medium, wherein the improvement comprises:
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said magneto-optical recording medium having at least one pair of magneto-optical storage layers each pair consisting of a first storage layer formed on one of opposite sides thereof, and a second storage layer formed on the other side thereof, said first and second storage layers having at least one pair of mutually corresponding recording segments, each of said at least one pair of corresponding recording segments consisting of a first recording segment provided on said first storage layer and a second recording segment provided on said second storage layer; a first optical head for exposing local spots on said first storage layer to a first light beam and thereby writing and erasing information on said first storage layer, said first optical head having a first focal point on said first storage layer; a second optical head for exposing local spots on said second storage layer to a second light beam and thereby writing and erasing information on said second storage layer, said second optical head having a second focal point which is adjacent to said first focal point in a direction parallel to said first and second storage layers; common magnetic-field generating means for producing magnetic fields in a predetermined direction, at the exposed local spots on said first and second storage layers; and recording control means for activating said magnetic-field generating means to produce said magnetic fields, and activating one of said first and second optical heads to erase previous information already recorded on corresponding one of said first and second recording segments of said each pair of corresponding recording segments, while activating the other of said first and second optical heads to write first new information on the other of said first and second recording segments, upon reception of a command to write second new information on said each pair of corresponding recording segments, said recording control means activating said other optical head to erase said first new information recorded on said other of said first and second recording segments, while activating said one optical head to write said second new information on said one of said first and second recording segments.
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10. A magneto-optical recording apparatus for writing information on a magneto-optical memory disc, wherein the improvement comprises:
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said magneto-optical memory disc having at least one pair of magneto-optical storage layers each pair consisting of a first storage layer and a second storage layer which are formed on opposite sides thereof, each of said first and second storage layers having at least one recording track which is formed in a substantially circumferential direction of said memory disc; a first optical head disposed on one of said opposite sides of said memory disc, for writing first information on said at least one recording track on said first storage layer; a second optical head disposed on the other side of said memory disc, for writing second information on said at least one recording track on said second storage layer; driving means for rotating said memory disc about an axis thereof, between said first and second optical heads, during operations of said first and second optical heads; and recording control means for activating said first and second optical heads and said driving means such that said first information and said second information are written on the recording tracks on said first and second storage layers, respectively, in the same circumferential direction of said memory disc, as viewed in a direction parallel to said axis of rotation of said memory disc, from one of said first and second optical heads toward the other optical head. - View Dependent Claims (11, 12, 13)
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Specification