Single motor driver for a helical scan recording/reproducing device
AssigneeSony Corporation
InventorMasato Tanaka
Life of this patent
Estimating the term…
Abstract
A rotary head tape recording and reproducing apparatus drives a rotary drum and a capstan by a common driving motor. In the reproducing mode, rotary heads generate a scanning position detection signal by picking up an address signal indicating the current scanning position from the recording track, and the driving motor is controlled so as to match the scanning position detection signal with a reference scanning position signal.
Claims17
A rotary head tape recording and reproducing apparatus for recording or reproducing an information signal including address data on or from recording tracks formed on a magnetic tape across a longitudinal direction of said magnetic tape, the apparatus comprising:
- rotary head means;
- head drum means mounting the rotary head means and supporting a magnetic tape wound helically around the head drum means along a predetermined wrap arc, the rotary head means recording or reproducing the information signal on or from the magnetic tape;
- capstan means for driving the magnetic tape;
- a take-up reel for taking up the magnetic tape;
- transmission gear means connected to the head drum means, the capstan means, and the take-up reel and having respective predetermined reduction ratios with relation to each of the head drum means, the capstan means, and the take-up reel;
- a single motor for driving the head drum means, the capstan means, and the take-up reel through the transmission means, at least the head drum means, the capstan means, and the take-up reel being driven in rotation, the rotational speed of the capstan means and the take-up reel relative to the head drum means being directly dependent on said reduction ratios of the transmission gear means with relation to each of the head drum means, the capstan means, and the take-up reel;
- reference means for generating first and second reference signals to serve as respective bases for comparison;
- means for generating a first output signal representing a rotational state of the rotary head means;
- means for generating a second output signal representing address data reproduced from the magnetic tape by the rotary head means;
- comparison means operative in a recording mode for comparing the first reference signal with the first output signal to produce a first comparison signal and in a reproducing mode for comparing the second reference signal with the second output signal to produce a second comparison signal;
- and
- servo control means operative in the recording mode for controlling the motor in accordance with the first comparison signal and in the reproducing mode for controlling the motor in accordance with the second comparison signal.
Dependencies are inferred from the claim text.