Method of reading and/or writing information and apparatus for carrying out the method
AssigneeU.S. Philips Corporation
InventorHendrik J. Sanderson
Life of this patent
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Abstract
Method and apparatus for positioning magnetic heads in a two-head helical scan video recorder, suitable control signals being generated for making the heads follow the tracks by means of piezoelectric transducers. The control signals applied to the two transducers are compared and when these control signals deviate from each other more than to a predetermined extent the one transducer receives the same control signal as the other transducer, so as to ensure that the two heads follow consecutive tracks.
Claims9
A method of positioning reading and/or writing heads arranged for alternately following consecutive recording tracks of a recording medium in the form of a tape, said tracks being substantially parallel one to the other and form an angle with the longitudinal axis of said recording medium, said method comprising:
- providing a first and a second transducer for positioning said heads, respectively;
- applying a first and a second control signal to said first and second transducers, respectively, for causing said heads to respectively follow a recording track;
- comparing the relative positions of said heads;
- and
- applying a third control signal, similar to said second control signal, to said first transducer in substitution for said first control signal when the relative positions of said heads differ by more than a predetermined amount.
An apparatus for positioning magnetic heads comprising a first and a second head for reading and/or writing information by in turn consecutively following recording tracks, which tracks are substantially parallel to each other and which make an angle with the longitudinal axis of a recording medium in the form of a tape, a first and a second transducer for respectively moving the first and the second head, means for providing a first and a second control signal for said first and second transducers, respectively, causing said heads to respectively follow a recording track, means for detecting whether the difference between the respective positions of the first head and the second head, in a direction transverse to the direction of the recording tracks, exceeds a predetermined value, and correction means for applying a third control signal, corresponding to the second control signal, to the first transducer when said difference exceeds said predetermined value.
Dependencies are inferred from the claim text.