초록 ▼

A magnetic head assembly for a video tape recorder includes a piezo-electric support, preferably constituted by a bi-morph leaf or leaves, supported at one end, for example, on a rotary portion of a tape guide drum, and a magnetic head mounted at the other end of the piezo-electric support, and the

A magnetic head assembly for a video tape recorder includes a piezo-electric support, preferably constituted by a bi-morph leaf or leaves, supported at one end, for example, on a rotary portion of a tape guide drum, and a magnetic head mounted at the other end of the piezo-electric support, and the piezo-electric support has two pairs of first and second electrodes secured on opposed major surfaces, respectively, of the support and extending in the direction between the ends of the support, that is, in the lengthwise direction of the latter, with such pairs of electrodes being parallel and spaced from each other in the direction across the support. Thus, by applying suitable control voltages between the first and second electrodes of the two pairs thereof, the piezo-electric support can be made to flex or bend longitudinally and/or torsionally, for example, for correcting tracking erro

대표청구항 ▼

The combination of a magnetic head assembly comprising piezo-electric support means of elongated plate-like configuration having opposed major surfaces and being supported at one end, a magnetic head mounted on said support means adjacent the other end thereof, and pairs of first and second electrod

The combination of a magnetic head assembly comprising piezo-electric support means of elongated plate-like configuration having opposed major surfaces and being supported at one end, a magnetic head mounted on said support means adjacent the other end thereof, and pairs of first and second electrodes secured on said opposed major surfaces, respectively, and extending in the direction between said one and other ends of the support means with said pair of electrodes being parallel and spaced from each other in the direction transverse to said direction between the ends; and drive circuit means for applying selectively varied voltages across said first and second electrodes of said pairs and by which said piezo-electric support means is selectively made to flex for deflecting said head in a direction substantially normal to the plane of said plate-like support means and for varying the azimuth angle of said head, said drive circuit means including means connecting said first electrode of one of said pairs and said second electrode of the other of said pairs to ground, a source of a variable control voltage, means for providing a reversed polarity replica of said variable control voltage, means for providing each of said variable control voltage and said reversed polarity replica thereof with a selectively varied D.C. voltage bias, and means for applying said variable control voltage with said D.C. voltage bias and said reversed polarity replica with said D.C. voltage bias to said second and first electrodes, respectively, of said one pair and said other pair, respectively, of the electrodes.