JPH0341911B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a rotating head type magnetic recording/reproducing device.

BACKGROUND TECHNOLOGY AND PROBLEMS During a pause operation in a conventional rotary head type magnetic recording/reproducing device, the rotary head drum remains rotating in a steady speed state and is stopped in a loading state where the magnetic tape is wound around the rotary head drum. The pause movement was executed by

Therefore, since the rotating magnetic head of a rotating head drum rubs the same signal track for recording and reproducing on a stationary magnetic tape many times at high speed, the surface of the magnetic layer is worn or damaged, causing the recording signal to deteriorate. It had the disadvantage that it was missing, causing dropout.

OBJECTS OF THE INVENTION In view of the above-mentioned points, it is an object of the present invention to provide a pause mechanism in which a magnetic head is brought into sliding contact with a portion of a magnetic tape other than a signal track for recording/reproducing etc. during a pause operation.

SUMMARY OF THE INVENTION For this reason, the present invention includes a magnetic head that is drive-controllably supported by a piezoelectric element and is mounted on a rotating head drum of a magnetic recording/reproducing device, so that during a pause operation, the magnetic head of the rotating head drum is stopped in a loading state. A pause mechanism is provided that operates so as to slide into contact with a portion of the magnetic tape that is not involved in signals other than the signal track for recording and playback, etc., so that even if the pause operation is repeated, the magnetic layer in the signal track portion for recording and playback of the magnetic tape will not be worn out. The present invention is characterized in that it is designed to prevent dropouts from occurring due to pose operations.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 schematically shows a tape path and a rotating head drum portion of a magnetic recording/reproducing apparatus which is an example of the present invention. Reference numeral 1 designates a magnetic tape 2 as a rotating head drum.

The magnetic tape 1 is loaded onto a rotating head drum 2 using two guide posts 3, 3, and the tape path of the magnetic tape 1 at this time is the same as in the conventional loading method in which the magnetic tape is wound diagonally around the rotating drum. Unlike the tape path of the rotary head drum, it is set on a plane perpendicular to the drum axis of the rotating head drum.

That is, the imaginary center line 4 shown by a two-dot chain line in the diagram passing through the center of the width of the magnetic tape 1 running on the tape path is placed on a single imaginary plane 6 perpendicular to the center line 5 of the drum shaft. A flat tape path is set. By taking such a planar tape path, it is possible to obtain an ideal running system in which the magnetic tape is tensioned uniformly at each point of its virtual cross section in the width direction.

The structure of the rotary head drum 2, which performs recording and reproduction using the conventional helical scan recording pattern on the magnetic tape loaded so as to take a planar tape path, and is equipped with a pause operation mechanism, is shown in longitudinal section in Fig. 2. It is becoming as shown.

In the figure, 7 is a rotating drum, and this rotating drum 7
The head chip 8 of the magnetic head mounted on the
Bimorph element (hereinafter referred to as bimorph element 9) having a structure sandwiched between two electrodes 10 in a sandwich pattern
It is fixed to the underside of the free end with adhesive.

This head chip 8 is connected to a head window 11 provided on the surface of the rotating drum 7 that comes into sliding contact with the magnetic tape.
The root end of the bimorph element 9 is fixed to the abutment 10 at the center of the rotating drum 7 by positioning it so that it protrudes a predetermined minute amount from the base.

Each electrode 10 provided on this bimorph element 9
is electrically connected to a power source (not shown) via a conductive slip ring 12 provided on the upper part of the rotating head drum 2 and an electric brush 13 connected to this, and the bimorph is formed by controlling the voltage of this power source. The element 9 is bent so that the head tip 8 swings along the head window 11, that is, moves in the width direction of the tape.

In addition, a drum shaft 14 is provided at the central shaft portion of the rotating drum 7.
The drum shaft 14 is supported by bearings 16 and 17 built into the upper and lower parts of the housing 15 of the rotary head drum. The outer rings of the bearings 16 and 17 are fixed by fixing members 18 and 19, respectively.

When the rotary drum 7 is driven to rotate, a transmission belt or the like is wound around a pulley 20 fitted to the lower end of the drum shaft 14, and the rotary drum 7 is driven to rotate by an indirect drive.

At this time, the magnet 2 attached to the top of the rotating drum 7
1 and a corresponding external PG coil 22 to detect the rotation speed and control the rotation.

Further, recording/reproduction signals for the magnetic tape 23 that pass through the head chip 8 are input/output to the outside through a rotary transformer 24 consisting of a static transformer 25 and a rotary transformer 26 built into the rotary head drum 2.

Next, the operation of the present invention will be explained.

When the magnetic recording/reproducing apparatus of the present invention is in a steady running state such as during recording/reproducing, the magnetic head of the rotating head drum 2 rotates on the running magnetic tape 23 on a recording track of a tape format equivalent to that of a general helical scan system. The head chip 8 is made to scan.

Therefore, the electrodes 10, 10 of the bimorph element 9
The head chip 8 is swung to a periodically determined predetermined position by applying a voltage to the bimorph element 9 and bending the bimorph element 9. The voltage applied to the bimorph element at this time will be explained with reference to FIG. do.

The timing of the points indicated in parentheses in the figure is the timing of the PG coil 22, which detects the rotational position of the rotary head drum 2.
At this point, in order to move the head chip 8 by a predetermined amount from B to C in the figure, an applied voltage shown from b to c in the figure is applied.

The applied voltage at this time is timed by a phase detection circuit and is applied as a triangular wave.

By applying such an applied voltage, the head chip 8 moves the magnetic tape 23 as shown in FIG.
The predetermined recording/reproduction signal track 27 above is scanned.

In addition, in the pause mode of the magnetic recording/reproducing apparatus of the present invention, by applying a voltage shown in FIG.
Make it slide on parts other than 7.

In this example, by applying the above-mentioned applied voltage, the head tip 8 of the rotating head drum 2 sends signals such as recording and reproduction of the magnetic tape 23 to the running magnetic tape 23 as shown in FIG. It is made to slide on a guard band 28 for pose set on the lower side of the track 27.

In addition, in this example, the CTL track 29 is set at the upper edge of the magnetic tape 23, so the guard band 28 for pose is set near the lower edge of the magnetic tape 23 in the longitudinal direction of the magnetic tape. shall be kept.

If the CTL track is not located at the upper edge of the diagram of the magnetic tape 23, an applied voltage is applied to the bimorph element 9, and correspondingly, the pause guard band 28 is placed on the recording/reproduction signal track 27 of the magnetic tape 23. Of course, it may be set above the .

In this way, during the pause operation of the magnetic recording/reproducing device, the head chip 8 comes into sliding contact with the guard band 28 set for the pause, and the head chip 8 slides in a position completely different from the signal track 27 on the magnetic tape 23. Therefore, the magnetic layer of the magnetic tape in the signal track portion is not damaged, and the service life of the magnetic tape is not affected at all.

Effects of the Invention As detailed above, according to the invention, during pause operation, the head chip comes into sliding contact with the guard band set at a part other than the required part of the signal track for recording and reproducing magnetic tape, etc. Since the magnetic layer of the required part of the signal track for recording and reproduction is not damaged, the pause operation does not cause dropouts, and the life of the magnetic tape can be extended.

Furthermore, since the rotation of the rotary head drum is not stopped or the number of revolutions is not reduced during the pause operation of the magnetic recording/reproducing device, the pause operation release command is issued at the same time.
This has the advantage of having excellent so-called rise characteristics when transitioning to a recording or reproducing operation.

[Brief explanation of the drawing]

FIG. 1 is a perspective view schematically showing a tape path and a rotating head drum portion of a magnetic recording/reproducing apparatus which is an example of an embodiment of the present invention, FIG. 2 is a longitudinal sectional front view of the rotating head drum portion, and FIG. 3 is an electro-mechanical conversion FIG. 4 is a diagram illustrating the relationship between the voltage applied to the element and the moving distance of the head chip. FIG. 4 is an enlarged explanatory diagram showing an outline of the recording format by taking out a part of the magnetic tape. In the figure, 2 is a rotating head drum, 8 is a head chip, and 9 is an electro-mechanical conversion element.

Claims (1)

[Claims] 1. The magnetic tape wound around the rotating head drum runs in a plane perpendicular to the drum axis, and the rotating head drum is equipped with a magnetic head supported by an electro-mechanical transducer, so that the magnetic tape is rotated during pause operation. 1. A pause mechanism for a magnetic recording/reproducing device, characterized in that a magnetic head is brought into sliding contact with a guard band portion at a portion different from a signal track for recording/reproducing, etc.