H - Electricity – 04 – N
Patent
H - Electricity
04
N
352/21.1
H04N 5/76 (2006.01) G11B 5/588 (2006.01) G11B 5/592 (2006.01) G11B 21/10 (2006.01)
Patent
CA 1128201
ABSTRACT In a VTR having a rotary transducer for scanning paral- lel tracks on a record medium in which signal information is recorded and being displaced at a skew angle with respect to the direction of travel of the record medium, an electro- mechanical adjustable transducer support, preferably of a piezo-ceramic material supports the transducer for displacement transversely with respect to the parallel tracks in response to a drive signal, and an open loop servo circuit is provided for generating the drive signal to align the scanning path of the transducer with one of the parallel tracks. The open loop servo system includes a first detecting device for detecting the position of the beginning of one of the parallel tracks, a second detecting device for detecting the rotational position of the rotary transducer, a device for generating an output speed signal corresponding to the speed of the record medium, and a signal processing device receiving the outputs of the first and second detecting devices and the speed signal generating device for generating a first component signal which corresponds to the deviation between the beginning of the transducer scanning path and a recorded track and is a function of the relative speed between the rotary transducer and the record medium. The open loop servo system further includes a sawtooth waveform generating device responsive to an output from the second detecting device, and an amplitude adjusting device supplied with the output of the sawtooth waveform generating device and being responsive to the output of the speed signal generating device for generating a second component signal, with the first and second component signals being added for producing the drive signal by which the transducer is transversely displaced with respect to a parallel record track.
291970
Hashizaki Kazuo
Shirane Kyoichi
Gowling Lafleur Henderson Llp
Sony Corporation
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