JPH0536019A - Rotary head device - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a rotary cylinder device that can be manufactured more inexpensively in a helical scan type rotary head device. [Structure] A cylinder mounted on a mechanism substrate and a magnetic head having one coil mounted on the cylinder are provided, and two gaps 26 and 27 having different azimuth angles are formed in the magnetic head. ..

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital audio tape recorder, a video tape recorder or the like, in which a magnetic tape is spirally wound around an inclined cylinder, and information is recorded on an inclined track with respect to the longitudinal direction of the magnetic tape. Then
Further, the present invention relates to a so-called helical scan type rotary head device for reproducing the information thus recorded.

[0002]

2. Description of the Related Art In recent years, rotary head devices have become smaller and lighter and have higher recording density, and accordingly, attempts have been made to improve the track density on the recording tape. A guard bandless recording method can be cited as a recording method for improving the track density. The guard bandless recording method is a method of relatively reducing the gap between two magnetic heads for recording / reproducing adjacent tracks. This is a recording method in which the angle (azimuth angle) is tilted by ± θ and crosstalk is reduced by utilizing the azimuth loss, so that the guard band, which is a non-recording portion between tracks, is omitted.

An example of the conventional rotary head device described above will be described below with reference to the drawings.

FIG. 2 is a plan view of a conventional rotary head recording / reproducing apparatus, FIG. 3 is an enlarged view of a conventional magnetic head, FIG. 4 is an enlarged view of a conventional magnetic head seen from the front, and FIG. 5 is recording on a magnetic tape. It is an enlarged view of a truck.

As shown in FIG. 2, the cylinder unit 1
Is composed of a fixed cylinder 3 provided with leads for restricting the running of the magnetic tape on the outer peripheral portion thereof, and a rotary cylinder 2 coaxially and rotatably attached to the fixed cylinder 3. Further, the cylinder unit 1 is attached to the upper side of the mechanism substrate 20 while being inclined by the attaching portion provided on the fixed cylinder 3.

[0006] Loading posts 10 and 11 and inclined posts 1 set up on loading bases 17 and 18.
The magnetic tapes 5 and 16 pull out the magnetic tape 12 from the tape cassette 19 in which the magnetic tape 12 is stored, move to predetermined positions regulated by the stoppers 8 and 9 attached to the guide members 6 and 7, and remove the magnetic tape 12 from the magnetic tape 12. It is for winding a predetermined angle around the cylinder unit 1, and moves along the guide groove portions provided in the guide members 6 and 7.

The structure of a conventional magnetic head will be described with reference to FIG. The magnetic head is usually composed of two head cores 21 and 22 made of single crystal ferrite joined by glass 23.
4 is rolled up. Further, the head cores 21 and 22 are joined so that a gap 25 is formed in the front surface portion.

This rotary head device records information on a track inclined with respect to the longitudinal direction of the magnetic tape 12 or reproduces the information thus recorded. In a rotary head device using a bandless recording method, the track pattern on the magnetic tape does not have a guard band, and the signal recorded on the track instead has the angle of the gap of the magnetic head recording the signal. The azimuth angle according to is provided.

FIG. 4 shows an enlarged view of the front surface of the magnetic head having a pair of different azimuth angles. A magnetic head having a gap with an azimuth angle of −θ degrees with respect to the traveling direction is
The head, a magnetic head having a gap with an azimuth angle of + θ degrees with respect to the traveling direction, is referred to as a B head. Further, FIG. 5 shows track patterns recorded by these A heads and B heads. A track recorded by the A head is called an A track, and a track recorded by the B head is called a B track.

As shown in the figure, in the guard bandless recording type rotary head device, the recording signal on the A track recorded by the A head having a gap of −θ degree azimuth angle is −θ degree azimuth angle. And the recording signal on the B track recorded by the B head having a gap of + θ degrees azimuth angle has an azimuth angle of + θ degrees. Then, the A track and the B track are alternately and adjacently recorded. Further, in these rotary head devices, the magnetic head has a portion which is overwritten while overlapping the previous track at the time of recording, and the width of the track is narrower than the width of the gap portion of the magnetic head. Is characteristic. And during playback,
The magnetic head will also trace a part of the adjacent tracks to the left and right of the track being traced, but as the signals on adjacent tracks have different azimuth angles as described above, use azimuth loss. As a result, crosstalk can be reduced.

[0011]

However, in the conventional rotary head device described above, it is necessary to provide two types of magnetic heads having different azimuth angles in one rotary cylinder, and the magnetic head is a very expensive component. Therefore, there is a problem that it is costly.

The present invention solves the above problems, and an object of the present invention is to provide a rotary head device in which the number of magnetic heads can be reduced to half that of the prior art.

[0013]

To achieve the above object, a rotary head device of the present invention comprises a cylinder mounted on a mechanism substrate and a magnetic head provided on the cylinder and having at least one coil. The magnetic head has a structure in which two or more gaps having different azimuth angles are formed.

[0014]

According to the present invention, in the above-mentioned structure, by tracing two kinds of tracks recorded by a pair of magnetic heads having different azimuth angles with one magnetic head, both tracks can be reproduced.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A rotary head device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an enlarged view of a magnetic head portion of a rotary head device according to an embodiment of the present invention. In FIG.
The magnetic head has two head cores 21 and 22 on the glass 23.
The magnetic head is the same as the conventional magnetic head except that it is formed by joining the two magnetic heads with each other, except that two gaps 26 and 27 having different azimuth angles are provided on the front surfaces of the head cores 21 and 22. Is. The gap 26 is the same as the A head in the conventional example with respect to the traveling direction.
The azimuth angle is θ degrees, and the gap 27 has an azimuth angle of + θ degrees with respect to the traveling direction, like the B head in the conventional example.

In the rotary head device of the present invention, the magnetic head having the two different azimuth angle gaps of the A head and the B head as shown in FIG. A, track B
Track Two types of tracks can be traced and reproduced by one magnetic head. That is, when the A track written by the A head in the conventional example is traced by the magnetic head of the present invention, the signal can be reproduced by the gap 26 whose azimuth angle matches the A track.
When the B track written by the B head in the conventional example is traced by the magnetic head of the present invention, the signal can be reproduced by the gap 27 whose azimuth angle matches the B track. Further, when the A track is being traced, the reproduction signal leaks from the gap 27 where the azimuth angle does not match the A track, and when the B track is being traced, the azimuth angle does not match the B track. The leakage of the reproduced signal from the gap 26, which is not performed, can be suppressed by the azimuth loss.

As described above, the rotary head device according to the embodiment of the present invention can trace and reproduce two types of tracks having different azimuth angles with one magnetic head.
Even if a magnetic tape pattern is written on a conventional rotary head device, by rotating the rotary cylinder at twice the number of rotations at the time of recording, the conventional rotary head device is
/ 2 magnetic heads can be used for reproduction. For example, when the rotary head device of the present invention is applied to a reproduction-only machine, the number of magnetic heads to be attached to the device is halved compared to the conventional one. Since the number can be reduced, a more inexpensive rotary head device can be provided.

In the rotary head device of the present invention,
When applied to a read-only machine, crosstalk can be further reduced by making the track widths of the gaps 26 and 27 narrower than the conventional one and not tracing adjacent tracks.

[0020]

As is apparent from the above embodiments, according to the present invention, a magnetic head having a cylinder mounted on a mechanism substrate and a magnetic head having at least one coil provided on the cylinder is provided. Since there are two or more gaps with different azimuth angles, the rotary cylinder equipped with the above magnetic head is used as a read-only machine at a rotation speed twice as high as the recording speed of the conventional device. By rotating the magnetic head, it is possible to reduce the number of magnetic heads to half that of the conventional one, and it is possible to provide a more inexpensive rotary head device as compared with the conventional rotary head device.

[Brief description of drawings]

FIG. 1 is an enlarged side view of a magnetic head portion of a rotary head device according to an embodiment of the present invention.

FIG. 2 is a plan view of a conventional rotary head recording / reproducing apparatus.

FIG. 3 is an enlarged perspective view of a magnetic head portion of a conventional rotary head device.

FIG. 4 is an enlarged side view of a magnetic head of a conventional rotary head device as viewed from the front.

FIG. 5 is a schematic diagram of recording tracks on a magnetic tape.

[Explanation of symbols]

 1 Cylinder Unit 2 Rotating Cylinder 3 Fixed Cylinder 20 Mechanism Board 24 Coil 26, 27 Gap

Claims (1)

Claim: What is claimed is: 1. A cylinder mounted on a mechanism substrate and a magnetic head having at least one coil, the magnetic head being provided on the cylinder, the magnetic head having two different azimuth angles. A rotary head device having the above gap.