Method and apparatus for hydrodynamic magnetic recording
First Claim
1. For use in a recording apparatus wherein a prescribed characteristic of a recording medium is established by a transducer coupled therewith, a method of controlling the coupling of said transducer to said medium comprising the step of:
- forming a liquid bearing between the surface of said recording medium and said transducer, said liquid being of the type that will effectively readily evaporate without leaving a residue.
2 Assignments
0 Petitions
Accused Products
Abstract
Problems of wear and bounce created by imperfections in the surface of a magnetic recording medium, such as a chromium dioxide-coated drum, are circumvented by a hydrodynamic magnetographic imaging technique that provides the intended effective intimate contact between the recording head the magnetographic recording surface. A readily evaporatable liquid (e.g. water, alcohol, acetone) is applied to the surface of the drum slightly upstream of the location of the recording head, so as to create a liquid bearing against which the recording head is urged, and thereby intimately magnetically coupled with the surface of the drum, except for an extremely thin liquid film between the head and drum surface. As a result of this extremely thin liquid bearing, continuous pressure can be applied to the head to maintain the head in effective intimate contact with the surface of the recording medium without the fear of scratching the medium or causing wear on the head. Moreover, once the imaging process has been completed, and the recording head is retracted away from the drum (and the liquid bearing) the liquid bearing can be easily removed, as the liquid of which the bearing if formed, readily evaporates without leaving a residue, so that the drum is ready for the application of toner particles at a print station.
17 Citations
36 Claims
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1. For use in a recording apparatus wherein a prescribed characteristic of a recording medium is established by a transducer coupled therewith, a method of controlling the coupling of said transducer to said medium comprising the step of:
forming a liquid bearing between the surface of said recording medium and said transducer, said liquid being of the type that will effectively readily evaporate without leaving a residue. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. For use in an apparatus wherein a prescribed characteristic of a recording medium is established by a transducer coupled therewith, arrangement for controlling the coupling of said transducer to said recording medium comprising:
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means for applying to said recording medium a liquid of the type that will effectively readily evaporate without leaving a residue; and means for causing a liquid film to be provided at at least that portion of said recording medium at which said transducer is coupled to establish said prescribed characteristic, so as to provide an effective cushion between said transducer and the surface of said recording medium. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. For use in a magnetographic recording apparatus having a magnetic field responsive recording medium the magnetic storage characteristics of which are established by magnetic field generating transducer coupled therewith, an arrangement for controlling the coupling of said transducer to the surface of said medium comprising:
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means for applying to said recording medium a liquid of the type that will effectively readily evaporate without leaving a residue; and means for causing a liquid film to be provided at at least that portion of said recording medium at which said transducer is coupled so as to provide an effective cushion between said transducer and the surface of said recording medium. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30)
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31. For use in a magnetographic recording apparatus having a magnetic field responsive recording medium the magnetic storage characteristics of which are established by a magnetic field generating transducer coupled therewith, an arrangement for proving effective intimate magnetic coupling between said transducer and the surface said recording medium irrespective of imperfections in the surface of said recording medium or the contamination thereof by foreign matter comprising:
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means for applying to the surface of said recording medium a liquid of the type that will effectively readily evaporate without leaving a residue; and means for causing a liquid film to be provided at at least that portion of said recording medium at which said transducer is coupled, so that, with said transducer being urged toward physical contact with the surface of said recording medium, said liquid film acts as a cushion to prevent said physical contact but to provide said effective intimate magnetic coupling between said transducer and said recording medium. - View Dependent Claims (32, 33, 34, 35, 36)
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Specification