JPH0246518A - Rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make smaller the section generating the noise of a connecting part by moving the head gap part of a whole width erasing head so as to abut from one edge end of a recording pattern to the whole of a recording pattern successively. CONSTITUTION:A whole erasing head 13 has the tape sliding surface of the length approximately 2 times as much as the width of a tape 9 and an erasing gap 14 is provided on the position biased in the upper direction and supported movably in the upper and lower directions by shafts 15 and 16. A rack 17 formed at the edge part is engaged with a gear 18 provided on a motor shaft and the whole width erasing head 13 is movably constituted in the upper and lower directions in accordance with the rotation of a motor. When an erasing action is started, and from when the lower edge of the gap 14 is brought into contact with the upper edge end of 1 a recording pattern 12, erasing is started and further, while it is moved in the lower direction, the moving is stopped at the place here the gap is brought into contact with the whole of the erasing width. Thus, since the number of recording locuses erased partially can be reduced, the noise generation section due to overwriting can be made smaller.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention has a magnetic tape that is spirally wound and runs along the rotation locus of a rotary head, and the rotary head tilts the magnetic tape with respect to the longitudinal direction of the tape so that the magnetic tape is rotated in parallel. 2. This invention relates to a rotary head type magnetic recording/reproducing device that sequentially forms a recording pattern consisting of a plurality of recording trajectories parallel to \/, and is particularly characterized by an erasing method.

Conventional technology Conventional rotary head type magnetic recording and reproducing devices perform full-width erasing before the tape enters the rotary head to avoid the influence of previously recorded signals when overwriting new information on an already recorded tape. The head is positioned to erase the previously written recording trajectory.

The rotary head type magnetic recording and reproducing apparatus as described above will be explained below with reference to the drawings. FIG. 5 is a schematic diagram of a tape running system from a full-width erasing head to a rotating head in a conventional rotating head type magnetic recording/reproducing device, in which 1 is a rotating cylinder provided with a rotating head, and 2 to 7 are for predetermined running of the tape. 8 is a full-width erase head, and 9 is a magnetic tape. The magnetic tape 9 is regulated by each post so as to wrap around the full-width erasing head 8 and the rotating cylinder 1 at predetermined positions, and is run in the longitudinal direction of the tape by means of gear thrusters 3/, -7, etc.

A case will now be described in which a new signal is recorded from the middle of a tape that has already been recorded. Figure 6 shows the recording pattern when the recorded tape is running through the 8 full-width erase heads [7], and Figure 7 shows the full-width erase head 8 operating to begin erasing the recorded pattern. This shows the erased state of the recorded pattern at the time.

When the recording operation starts, the full-width erase head 8 works, and the head gap 1 extends perpendicular to the tape traveling direction as shown in FIG.
1. Therefore, out of a plurality of recording loci 1° that are inclined with respect to the longitudinal direction of the tape and parallel to each other forming the recording pattern 10, several recording loci 10a,
10b, 10c.

1od is erased from the middle.

Problems to be Solved by the Invention On the other hand, when overwriting, in order to reduce screen disturbances at joints, overwriting is done over the partially erased recording trajectories 108 to 10d described above in order to minimize the non-recording section. and record it. Therefore, after overwriting, multiple recording trajectories are created in which new signals are recorded partially overlapping the previously recorded recording trajectories, and during playback, noise is introduced into the reproduced signal in this overlapped recording section, making it difficult to read. There was a problem with a new playback screen.

In view of the above-mentioned problems, the present invention provides a rotary head type magnetic recording/reproducing device that can further reduce the area where noise occurs at the joint.

Means for Solving the Problem In order to achieve this object, the rotary head type magnetic recording/reproducing device of the present invention moves the head gap portion of the full-width erasing head sequentially from one edge of the recording pattern so as to come into contact with the entire recording pattern. It made it possible.

Operation With this configuration, at the start of erasing, the full-width erasing head is moved so that its head gap gradually increases from one end surface of the recording pattern approximately along the inclination of the recording pattern. .2 The number of recorded traces that are erased from the inside can be reduced, and the number of recorded traces that are recorded repeatedly is also reduced, making it possible to create a continuous recording screen with less noise during playback. .

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 1 is a side view of a main part of an embodiment of the present invention before erasing starts, and FIG. 2 is a front view thereof.

In FIG. 1, 13 is a full-width erase head, and unlike conventional full-width erase heads, it has a tape sliding surface that is approximately twice the tape width, and the erase gap 14 is biased upward. It is located at a certain position. This full-width erasing head 13 is supported by a shaft 15.degree. 16 so as to be movable in the vertical direction, and a rack 17 formed at the end thereof meshes with a gear 18 provided on a motor shaft. That is, the full-width erasing head 13 is configured to be movable in the vertical direction in accordance with the rotation of the motor.

Next, this operation will be explained. Before starting the erase operation, the first
As shown in FIG. 2 and FIG.
The gap portion 14 is positioned outside the recorded pattern 12 to be erased.

When the erasing operation begins, the motor rotates, and the full-width erasing head 13 begins to move downward. Erasing begins when the lower end of the gap 14 touches the upper edge of the recorded pattern 12, and as it moves further downward, the gap The movement stops when the entire erase width is touched. This stopped state is shown in Figures 3 and 4.
As shown in the figure. At this time, the moving speed of the erasing head 13 is controlled so that the moving trajectory on the tape at the lower end of the gap 14 is approximately parallel to the inclination of the recording trajectory forming the recording pattern, so that a partially erased recording trajectory is achieved. 9 can be made smaller than when erasing with a conventional fixed full-width erasing head, making it possible to reduce noise caused by overwriting.

Effects of the Invention As described above, the present invention provides a fixed head by moving the hemlock gap of the full-width erasing head so that it comes into contact with the entire recording pattern sequentially from one edge of the recording pattern at the start of erasing. Since the number of partially erased recording trajectories can be reduced compared to erasing with a full-width erasing head, it is possible to reduce the noise generation section due to overwriting.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a main part of an embodiment of the rotary head magnetic recording/reproducing device of the present invention before erasing starts, FIG. 2 is a front view of the same, and FIG. 3 is a normal view of the same embodiment. 4 is a front view of the erasing operation state, FIG. 6 is a perspective view of the main parts of a conventional rotary head type magnetic recording/reproducing device, and FIG. 6 is a full-width erasing head, tape, and tape in the conventional device. FIG. 7 is a diagram showing the positional relationship of the recorded patterns recorded above, and FIG. 7 is a diagram showing the erase pattern when erasing is started with a conventional full-width erase head. 1...Rotating head, 2-7...Post, 8...Conventional full-width erasing head, 9...
・Magnetic tape, 1°... Recording pattern, 11.
...Full-width erase head gap, 12...
・Record pattern width, 13...Full width erase head,
14...Gap, 16-16...Shaft, 17...Rack, 18...Gear, 19...Motor. Name of agent: Patent attorney Shigetaka Awano and 1 other person

Claims (1)

[Claims] A rotating head in which a magnetic tape is spirally wound and run along a rotation locus of a rotary head, and the rotary head sequentially forms a recording pattern consisting of a plurality of recording loci that are inclined with respect to the longitudinal direction of the tape and parallel to each other. type magnetic recording/reproducing device, an erasing head having a head gap having a head width capable of erasing at least the recorded pattern;
A rotary head type magnetic recording/reproducing device characterized in that, at the start of erasing, the head gap is sequentially moved from one edge of the recording pattern until it comes into contact with the entire recording pattern.