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Magnetic tape recording and/or reproducing apparatus with automatic head positioning
| Details |
Inventors: Rijckaert, Albert M. A.; de Niet, Edmond; Beun, Jacobus P.;
Assignee: U.S. Philips Corporation (New York, NY)
Primary Examiner: Tupper; Robert S.
Assistant Examiner:
Attorney, Agent or Firm: Treacy; David R.
A magnetic tape recorder or playback apparatus, especially suitable for tape having a large number of parallel longitudinal tracks, has a positioning device for independently correcting tracking and skew errors. A first positioning system uses two piezo-electric elements parallel to each other and equally spaced on opposite sides of the pivot axis, and a second positioning system arranged between the first two piezo-electric elements, having at least three piezo-electric elements regularly spaced around and extending longitudinally about the pivot axis. |
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DETAILED DESCRIPTION What is claimed is: 1.
An apparatus for recording and/or reproducing signals in a plurality of parallel longitudinal tracks on a magnetic tape, comprising: a head support, a magnetic head having a head face adapted to allow movement of a magnetic tape thereacross during operation, and air gaps which terminate in a scanning portion of the head face for scanning respective tracks on said magnetic tape, a positioning system attaching said magnetic head to said head support for adjustably positioning the magnetic head relative to said magnetic tape, comprising a first positioning means including piezo-electric elements for moving the head position in a first direction relative to the magnetic tape; a second positioning means comprising piezo-electric elements for pivotally moving said magnetic head in a second direction relative to the magnetic tape about a pivotal axis extending substantially perpendicularly to a plane tangential to said scanning portion of the head face; and first and second control means for generating and applying respective control signals to the piezo-electric elements of the first and second positioning means, said control signals being representative of the difference between the instantaneous and the desired position of the magnetic head relative to the magnetic tape, characterized in that said first positioning means includes two piezo-electric elements disposed substantially parallel to each other and to said pivotal axis, on opposite sides of the pivotal axis, and arranged for moving the magnetic head in the width direction of the magnetic tape, said second positioning means includes at least three piezo-electric elements each having a longitudinal axis, regularly spaced around said pivotal axis with said longitudinal axes extending substantially parallel to said pivotal axis, and one of said positioning means is connected to the head support through the other positioning means.
2.
An apparatus as claimed in claim 1, characterized in that the second positioning means comprises at least two pairs of piezo-electric elements, the two elements of each pair of piezo-electric elements being disposed diametrically opposite one another relative to the pivotal axis
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Metal Working 
