JP2001297417A - Magnetic head device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely perform recording/reproducing without any positional fluctuation of a magnetic recording medium crossed to travel. SOLUTION: This magnetic head device is provided with a cylindrical fixed drum, a rotary drum formed to be cylindrical and disposed to be rotated with respect to the fixed drum, and at least one or more magnetic heads disposed to protrude from the peripheral surface of the rotary drum. In this case, a recessed part is formed in the upper part of the magnetic head in the peripheral surface of the rotary drum.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic head device for recording and / or reproducing signals on a tape-shaped magnetic recording medium.

[0002]

2. Description of the Related Art Conventionally, there has been known a magnetic head device provided with a rotating drum having a magnetic head for performing recording and reproduction on a tape-shaped magnetic recording medium. This magnetic head device is used for a recording / reproducing device of a so-called helical scan magnetic recording system. The magnetic head device is
For example, a cylindrical fixed drum that is not driven to rotate, a rotary drum rotatably disposed with respect to the fixed drum, a plurality of magnetic heads protruding from the peripheral surface of the rotary drum, and rotating the rotary drum And a motor. Also,
A lead guide portion is engraved on the peripheral surface of the fixed drum so that the tape-shaped magnetic recording medium is obliquely engaged with the tape-shaped magnetic recording medium.

[0003] The magnetic recording / reproducing apparatus has a running system for running a tape-shaped magnetic recording medium while attaching a magnetic head device. The traveling system draws the tape-shaped magnetic recording medium from a supply roll around which the tape-shaped magnetic recording medium is wound, ties the tape-shaped magnetic recording medium to a magnetic head device, and a lead guide section engraved on a fixed drum. The tape-shaped magnetic recording medium is caused to travel along.

In the magnetic head device, the rotating drum rotates while the tape-shaped magnetic recording medium travels along the lead guide portion, so that the tape-shaped magnetic recording medium moves at a predetermined angle with respect to the longitudinal direction of the traveling tape-shaped magnetic recording medium. The magnetic head is scanned while tilted. Thereby, the magnetic head device forms a recording track inclined at a predetermined angle with respect to the longitudinal direction of the tape-shaped magnetic recording medium.

[0005] At this time, the tape-shaped magnetic recording medium travels in a state in which air enters between the rotating drum and the rotating drum and floats by a predetermined amount with respect to the peripheral surface of the rotating drum. Become. Further, when the tape-shaped magnetic recording medium comes into contact with the magnetic head projecting from the peripheral surface of the rotating drum, a so-called tent shape is formed according to the amount of projection of the magnetic head. That is, the tape-shaped magnetic recording medium is
The portion pressed by the magnetic head and coming into contact with the magnetic head becomes convex. Recording and reproduction of signals are performed on the magnetic recording medium in a state where the tent shape is formed.

[0006]

However, in such a magnetic head device, if the above-mentioned tent shape is not always formed accurately, it is impossible to perform reliable recording and reproduction. That is, if the entire tape-shaped magnetic recording medium is greatly displaced, the tent shape at the time of recording and the tent shape at the time of reproduction change, and as a result, the recorded recording track can be accurately scanned at the time of reproduction. This causes output fluctuation due to track deviation.

In other words, the tape-shaped magnetic recording medium on which recording and reproduction are performed by running as described above must always be running in a constant state without causing a position change. However, since the tape-shaped magnetic recording medium runs obliquely on the rotating drum along the lead guide portion and runs, it starts to be engaged with the rotating drum (hereinafter, referred to as "entrance") and is engaged with the rotating drum. The flying height differs at the end (hereinafter, referred to as “exit”). For this reason, the magnetic head device as described above has a problem that it is difficult to accurately record and reproduce on a tape-shaped magnetic recording medium without causing output fluctuation.

In particular, in a magnetic head device, the rotating drum is being rotated at a high speed in accordance with the broadening of the recording / reproducing signal to be used. The difference in the amount becomes large. If the flying height becomes large, the tape-shaped magnetic recording medium cannot form a desired tent shape, cannot obtain sufficient contact with the magnetic head near the entrance, and adversely affects recording and reproduction. Will have an effect. Therefore, the magnetic head device has a problem that it is difficult to perform particularly accurate recording and reproduction when the rotating drum is rotated at a high speed.

The present invention has been devised in view of the above-mentioned circumstances, and a magnetic head device capable of reliably performing recording / reproducing without causing a positional change in a magnetic recording medium that runs while being multiplied. The purpose is to provide.

[0010]

A magnetic head device according to the present invention that has achieved the above-mentioned object has a cylindrical fixed drum, and is formed in a cylindrical shape and rotatably disposed with respect to the fixed drum. A magnetic head device comprising: a rotating drum; and at least one or more magnetic heads arranged to protrude from a peripheral surface of the rotating drum.
A concave portion is formed on the peripheral surface of the rotary drum above the magnetic head.

The magnetic head device according to the present invention configured as described above records and reproduces signals on and from the magnetic recording medium in a state where the magnetic head device is hung on the fixed drum and the rotating drum. In this magnetic head device, the flying height of the magnetic recording medium facing the recess can be reduced. That is, since the concave portion is formed above the magnetic head on the peripheral surface of the rotating drum, in this magnetic head device, the flying height of the magnetic recording medium positioned above the magnetic head can be reduced.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, specific embodiments of a magnetic head device according to the present invention will be described in detail with reference to the drawings.

In the following example, as shown in FIG. 1, a recording track is formed obliquely inclined at a predetermined angle with respect to the longitudinal direction of a tape-shaped magnetic recording medium 1 (hereinafter referred to as a magnetic tape 1). A magnetic head device 3 used in the recording / reproducing device 2 of a so-called helical scan magnetic recording / reproducing system will be described.

The recording / reproducing apparatus 2 is disposed at one end of a traveling path of the magnetic tape 1 and is disposed at a supply reel 4 around which the magnetic tape 1 is wound, and is disposed at the other end of the traveling path, and travels on the traveling path. A take-up roll 5 for winding the magnetic tape 1;
And a capstan motor 7 and a capstan 8 for moving the magnetic tape 1 at a predetermined tension and speed. That is, the magnetic tape 1 is sent at a predetermined tension and speed by a capstan 8 that is driven to rotate by a capstan motor 7, and is sent from the supply reel 4 through the guide roller 6 and wound around the magnetic head device 3. The recording and reproduction are performed by the magnetic head device 3. The magnetic tape 1 recorded and reproduced by the magnetic head device 3 is sent to the take-up roll 5 through the guide roller 6, the capstan 8, and the guide roller 6 in this order.

As shown in FIG. 2, the magnetic head device 3 comprises a cylindrical fixed drum 10, a cylindrical rotary drum 11, and a motor 12 for driving the rotary drum 11 to rotate.
And a plurality of magnetic heads 13 mounted on the rotating drum 11
And

The fixed drum 10 is a drum that is held without rotating. On the side surface of the fixed drum 10, a lead guide 1 is provided along the running direction of the magnetic tape 1.
5 are formed. As described above, the magnetic tape 1 travels along the lead guide 15 on the traveling path. The rotating drum 11 is disposed so that the center axis of the fixed drum 10 coincides with the center axis.

The lead guide portion 15 is formed so as to gradually decrease from the entrance side of the magnetic tape to be joined to the exit side of the magnetic tape. That is, the lead guide portion 15 is formed at a position close to the rotary drum 11 on the entrance side of the magnetic tape 1, and formed at a position separated from the rotary drum 11 on the exit side of the magnetic tape 1.

The rotating drum 11 is a drum that is driven to rotate at a predetermined rotation speed by a motor 12 during recording and reproduction on the magnetic tape 1. The rotating drum 11 is formed in a cylindrical shape having substantially the same diameter as the fixed drum 10, and is arranged such that the center axis of the rotating drum 11 coincides with that of the fixed drum 10. The plurality of magnetic heads 13 are mounted on the rotating drum 11 on the side facing the fixed drum 10. A plurality of windows 16 for mounting a plurality of magnetic heads 13 are formed on the peripheral surface of the rotating drum 11 and cut out toward a surface facing the fixed drum 10. That is, the plurality of magnetic heads 13 are connected to the window 16 of the rotating drum.
And protrudes from the window 16.

A plurality of recesses 17 are formed on the peripheral surface of the rotating drum 11 above the magnetic head 13. That is, the plurality of recesses 17 are
It is formed above a plurality of windows 16 on one peripheral surface.

In particular, the depth of the recess 17 indicated by x in FIG.
When the diameter of the portion of the rotary drum 11 where the concave portion 17 is not formed is R, R / 500 ≦ x ≦ R / 100
Is preferably within the range. The width of the concave portion 17 in the axial direction of the rotary drum 11 indicated by t in FIG. 3 is preferably in the range of T / 8 ≦ t ≦ T / 2, where T is the width of the magnetic tape 1. Further, as shown in FIG. 4, the width of the recess 17 in the circumferential direction of the rotary drum 11 is 6 ° ≦ when the central angle from the center r of the rotary drum 11 is θ.
It is preferable that the angle is in the range of θ ≦ 30 °.

The magnetic head 13 is an inductive type magnetic head in which a pair of magnetic cores are joined via a magnetic gap, and a coil is wound around the magnetic core. It may be used at the time of reproduction. When the plurality of magnetic heads 13 are inductive magnetic heads, the azimuth angles are set to be opposite between adjacent magnetic heads 13 so that azimuth recording is performed on the magnetic tape 1. Further, the magnetic head 13 may be a reproducing magnetic head having an MR element as a magnetic sensing element for detecting a signal from the magnetic tape 1 and used when reproducing a signal from the magnetic tape 1.

The magnetic recording / reproducing apparatus 2 configured as described above
Performs recording of signals on the magnetic tape 1 and reproduction of signals from the magnetic tape 1 by sliding the magnetic tape 1 on the magnetic head 13.

At this time, the rotary drum 11 is driven to rotate by a motor 12, as indicated by an arrow A in FIG. On the other hand, the magnetic tape 1 is moved along the lead guide portion 15 of the fixed drum 10 and the fixed drum 10 and the rotating drum 1.
Run diagonally to 1. That is, the magnetic tape 1
The fixed drum 10 and the rotating drum 11 are arranged in the tape running direction from the tape entrance side as shown by an arrow B in FIG.
Then, the paper is sent to the tape exit side as shown by the arrow C in FIG.

At this time, in the magnetic head device 3, when the rotating drum 11 rotates at a predetermined speed, air flows between the rotating drum 11 and the magnetic tape 1, and the pressure of the flowing air causes the magnetic tape 1 to rotate. Is slightly lifted from the peripheral surfaces of the rotating drum 11 and the fixed drum 10. That is, the magnetic tape 1 travels while floating above the peripheral surfaces of the fixed drum 10 and the rotating drum 11.

FIG. 5 shows the relationship between the position of the magnetic tape 1 and the flying height of the magnetic tape 1 in the magnetic head device 3. In FIG. 5, the flying height of the portion facing the concave portion 17 is indicated by a broken line, and the flying height of the portion of the magnetic tape 1 facing the peripheral surface of the rotary drum 11 is indicated by a solid line. FIG.
As shown in (1), the flying height of the portion of the magnetic tape 1 facing the recess 17 is smaller than that of the portion facing the portion other than the recess 17.

This is because the magnetic tape 1 has
This is because the space facing the portion other than the concave portion 17 has a larger space into which the air flows, and thus has a reduced floating pressure. On the contrary,
In the magnetic tape 1, a portion facing the portion other than the concave portion 17 is applied with a large floating pressure due to a small space into which the air flows, and has a relatively large floating amount.

As shown in FIG. 5, both the portion of the magnetic tape 1 facing the concave portion 17 and the portion facing the other portion than the concave portion 17 have a large flying height at the entrance side of the magnetic tape 1 and a small floating amount at the exit side. It has become. It is considered that this is because air for floating the magnetic tape 1 flows in from the inlet side of the magnetic tape 1 and then discharges from both side ends of the magnetic tape 1. That is, the levitation pressure is maximum at the entrance side of the magnetic tape 1 and gradually decreases toward the exit side.

On the other hand, the magnetic tape 1 rubs against the magnetic head 13, and a portion facing the magnetic head 13 protruding from the peripheral surface of the rotary drum 11 is deformed according to the amount of protrusion of the magnetic head 13. I have. That is, the magnetic head 13
The magnetic tape 1 that floats and runs from the peripheral surfaces of the fixed drum 10 and the rotating drum 11 is pressed and deformed, and signals are recorded and reproduced while sliding on the magnetic tape 1.
The deformed shape of the magnetic tape 1 at this time is called a tent shape.

Further, at the entrance side of the magnetic tape 1, the magnetic tape 1 runs with one lower end along the lead guide portion 15, and as shown in FIG. 13. Therefore, on the entrance side of the magnetic tape 1, a tent shape is formed in a lower portion of the magnetic tape 1.

At the entrance side of the magnetic tape 1, the recess 1
The flying height of the portion facing portions other than 7 is increased according to the profile shown by the solid line in FIG. However, the flying height of the portion facing the concave portion 17 decreases according to the profile shown by the wavy line in FIG. That is, the portion of the magnetic tape 1 facing the concave portion 17 is attracted in the circumferential direction of the rotating drum 11 because the floating pressure is reduced as compared with the surroundings.

In comparison with this, as shown in FIG. 7, in the magnetic head device 50 in which the concave portion 17 is not formed, the floating pressure generated with the rotation of the rotary drum 51 is not uniform, Even above the position 53, the magnetic tape 52 and the rotating drum 51 are largely separated from each other. In this case, the contact between the magnetic head 53 and the magnetic tape 52 becomes unstable. In addition, on the entrance side and the exit side of the magnetic tape 52, since the flying height above the magnetic head 53 follows the profile shown by the solid line in FIG. 5, the difference in the flying height becomes large, and a uniform contact state is not achieved. . In other words, in the magnetic head device 50, a uniform tent shape cannot be formed, and stable recording and reproduction cannot be performed.

On the other hand, the magnetic head device 3 described above
Then, since the floating pressure is reduced by the concave portion 17, the magnetic tape 1 does not largely separate above the magnetic head 13, so that a good tent shape can be formed.

Further, at the exit side of the magnetic tape 1,
The lower end of the magnetic tape 1 is connected to the lead guide portion 15.
And a relatively upper portion thereof is opposed to the magnetic head 13 as shown in FIG. Therefore, on the exit side of the magnetic tape 1, one end on the upper side of the magnetic tape 1 slightly faces the recess 17. Therefore, on the exit side of the magnetic tape 1, the action of reducing the floating pressure by the concave portion 17 hardly works on the magnetic tape 1. However, as shown in FIG. 5, the floating pressure on the exit side of the magnetic tape 1 is smaller than that on the entrance side of the magnetic tape 1, so that a good tent shape can be formed.

As described above, according to the rotary drum 11 having the concave portion 17, a uniform tent shape can be formed on the entrance side and the exit side of the magnetic tape 1. For this reason, according to the magnetic head device 3, since a desired tent shape can be always formed on the magnetic tape 1, stable recording and reproduction can always be performed.

On the other hand, in the magnetic head device 3, as shown in FIG. 9, the magnetic tape 1 floats from the peripheral surface of the rotary drum 11 in the portion other than the concave portion 17 of the rotary drum 11 as the rotary drum 11 rotates. I do. At this time, the levitation force generated on the peripheral surface of the rotating drum 11 is larger than the levitation force generated in the concave portion 17, so that the magnetic tape can be largely separated. For this reason, the magnetic tape 1 largely floats in a portion facing the portion other than the concave portion 17 of the rotating drum 11 and is hardly damaged by contact or the like.

In comparison with this, as shown in FIG. 10, a concave groove 61 formed by cutting out the entire circumference of the rotary drum 60 is provided.
The magnetic head device 62 formed with
By 1, the floating pressure is reduced over the entire circumference of the magnetic tape 63 running on the peripheral surface of the rotating drum 60. That is, in this case, as shown in FIG.
The floating pressure is not reduced only for the portion of the magnetic tape 63 facing the portion 4, but the flying height of the magnetic tape 63 is reduced even in the portion where the magnetic head 64 is not shown, although not shown. Further, in the magnetic head device 62, since the plurality of concave grooves 61 are formed in parallel, the levitation force is reduced with respect to the entire width of the magnetic tape 63. Therefore, in the magnetic head device 62, the magnetic tape 63 easily contacts the rotating drum 60, and the magnetic tape 63 may be damaged.

On the other hand, the magnetic head device 3 described above
According to this, by rotating the rotary drum 11 at a high speed, a desired tent shape can be formed on the portion of the magnetic tape 1 facing the magnetic head 13 and the other magnetic tapes 1 can be largely levitated. Therefore, according to the magnetic head device 3, stable recording and reproduction can be performed, and the magnetic tape 1 can be reliably prevented from being damaged.

On the other hand, in this magnetic head device 3, the depth x of the concave portion 17 is R / 50, where R is the diameter of the portion of the rotary drum 11 where the concave portion 17 is not formed.
It is preferable that the range of 0 ≦ x ≦ R / 100 is satisfied. If the depth x of the concave portion 17 is less than R / 500, the concave portion 1
There is a possibility that the effect of reducing the flying height of the magnetic tape 1 facing the magnetic tape 7 may not be achieved. The depth x of the recess 17 is R / 1.
If it exceeds 00, the flying height of the portion facing the concave portion 17 is greatly reduced, and the magnetic tape 1 and the rotating drum 1
1 may be brought into contact.

The width t of the recess 17 in the axial direction of the rotary drum 11 is given by T, where T is the width of the magnetic tape 1.
It is preferable that / 8 ≦ t ≦ T / 2. When the width t in the axial direction of the rotating drum 11 is less than T / 8, the portion for reducing the flying height of the magnetic tape 1 is too small, and a desired tent shape may not be formed. Rotating drum 11
If the width t in the axial direction is less than T / 2, the flying height is greatly reduced in the width direction of the magnetic tape 1 and the rotating drum 11 may come into contact with the magnetic tape 1.

Further, the rotating drum 11 in the recess 17
The circumferential width is represented by θ at the center angle from the center of the rotating drum 11.
It is preferable that the angle is in the range of 6 ° ≦ θ ≦ 30 °. If the value of θ is less than 6 °, the effect of reducing the flying height of the magnetic tape 1 is not sufficient, and a desired tent shape may not be formed. If the value of θ exceeds 30 °, the flying height is greatly reduced in the longitudinal direction of the magnetic tape 1 to be hung on the rotating drum 11,
There is a possibility that the rotating drum 11 and the magnetic tape 1 may come into contact with each other.

Incidentally, the present invention is not limited to the magnetic head device 3 having the concave portion 17 cut out from the peripheral surface of the rotary drum 11 into a substantially cylindrical shape. That is,
FIG. 12A shows a magnetic head device to which the present invention is applied.
As shown in (b) and (c), a magnetic head device 21 having a concave portion 20 having an elliptical shape when viewed from the peripheral surface side of the rotating drum 11 may be used.

That is, the magnetic head device 21 has an elliptical shape when viewed from the peripheral surface of the rotary drum 11, and has a concave portion 20 which is notched in an arcuate cross section in the axial direction as shown in FIG. . The concave portion 20 is formed by being cut out in an arc surface so that the major axis of the elliptical shape viewed from the peripheral surface is the lowest.

Since the concave portion 20 thus formed is notched as a circular arc surface, the displacement amount is gentle in both the minor axis direction and the major axis direction of the elliptical shape.
Therefore, the floating amount of the magnetic tape 1 is suppressed to a low level in a state where the floating pressure is gradually reduced at the portion facing the concave portion 20. Therefore, the magnetic head device 21 having the concave portion 20 can form a more excellent tent shape. In this magnetic head device 21,
Even when the magnetic tape 1 and the peripheral surface of the rotating drum 11 are in contact with each other, it is possible to reliably prevent the magnetic tape 1 from being damaged by the edge of the concave portion 21.

On the other hand, the present invention is not limited to the magnetic head device 3 having the rotary drum in which the concave portion 17 is formed immediately above the magnetic head 13 as described above. That is, as shown in FIG. 13, the magnetic head device to which the present invention is applied has a rotary drum formed with the concave portion 30 in the upper part of the magnetic head 13 and in the rotational direction earlier than immediately above the magnetic head 13. 11 may be provided.

In the magnetic head device 3, the concave portion 30 is formed in the stage immediately before the magnetic head 13 in the rotation direction of the rotary drum 11, and the air flowing in with the rotation of the rotary drum 11 has viscosity. The floating pressure can be reduced on the subsequent stage side of the concave portion 30. That is, in the magnetic head device 3, since the concave portion 30 is formed in the preceding stage in the rotation direction in consideration of the viscosity of the air, the floating pressure can be reduced immediately above the magnetic head 13.

In particular, when the rotation speed of the rotary drum 11 is increased, the delay of the position for reducing the floating pressure due to the viscosity of the air becomes remarkable. Therefore, the magnetic head device 3 having the concave portion 30 can reduce the floating pressure immediately above the magnetic head 13, particularly when performing recording and reproduction while rotating at a high speed. For this reason, the magnetic head device 3 having the concave portion 30 is particularly suitable for a recording / reproducing system that performs recording / reproducing while rotating at a high speed.

The magnetic head device according to the present invention may have, for example, the magnetic head 13 mounted on the main surface of the rotating drum 11 facing the fixed drum 10 without the window 16. . Further, the magnetic head device according to the present invention is not limited to, for example, one having four magnetic heads 13 but may be one having one or a plurality of magnetic heads other than four.

[0048]

As described above in detail, in the magnetic head device according to the present invention, since the concave portion is formed above the magnetic head on the peripheral surface of the rotary drum, the position fluctuation of the running magnetic recording medium is changed. Can be reliably prevented. Therefore, according to the magnetic head device of the present invention, it is possible to reliably perform recording and reproduction on the magnetic recording medium that runs while being hung on the rotating rotary drum.

[Brief description of the drawings]

FIG. 1 is a plan view schematically showing a configuration example of a recording / reproducing device including a magnetic head device according to the present invention.

FIG. 2 is a perspective view schematically showing a magnetic head device.

FIG. 3 is an enlarged perspective view of a main part showing a side surface of a rotary drum.

FIG. 4 is a cross-sectional view of a main part of the rotary drum with a part cut away.

FIG. 5 is a characteristic diagram showing a relationship between a position of a magnetic tape and a flying height in a magnetic head device.

FIG. 6 is a sectional view of a main part of the magnetic head device on the entrance side of the magnetic tape.

FIG. 7 is a cross-sectional view of a main part of a magnetic head device having no concave portion shown as a comparison.

FIG. 8 is a sectional view of a main part of the magnetic head device on the exit side of the magnetic tape.

FIG. 9 is a cross-sectional view of a main part of the magnetic head device where a magnetic head is not provided.

FIG. 10 is a perspective view of a magnetic head device in which a groove is formed in a rotating drum shown as a comparison.

FIG. 11 is a sectional view of a main part of the magnetic head device shown in FIG. 10;

12A and 12B are other examples of the magnetic head device according to the present invention, in which FIG. 12A is a side view of a main part of a magnetic head device shown as another example, and FIG. 12B is a magnetic head shown as another example. It is a principal part longitudinal cross-sectional view of a device, and (c) is a principal part cross-sectional view of a magnetic head device shown as another example.

FIG. 13 is a side view of a main part of a magnetic head shown as still another example of the invention.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 magnetic tape, 2 recording / reproducing device, 3 magnetic head device, 10 fixed drum, 11 rotating drum, 12 motor, 13 magnetic head, 16 window, 17 recess

Continued on the front page (72) Inventor Tadashi Osue 6-7-35 Kita-Shinagawa, Shinagawa-ku, Tokyo Sony Corporation F-term (reference) 5D036 AA09 BB02 BB12 CC04 CC21

Claims (3)

[Claims] 1. A cylindrical fixed drum, a rotary drum formed in a cylindrical shape and rotatably disposed with respect to the fixed drum, and disposed so as to protrude from a peripheral surface of the rotary drum. A magnetic head device comprising at least one or more magnetic heads, wherein a concave portion is formed on an upper surface of the magnetic head on a peripheral surface of the rotary drum. 2. The concave portion is a portion where the tape-shaped magnetic recording medium starts to be engaged with the peripheral surface of the fixed drum and the rotating drum while the tape-shaped magnetic recording medium running in the longitudinal direction is put on the peripheral surface. 2. The magnetic head device according to claim 1, wherein the magnetic head device is formed at a position completely covered by the tape-shaped magnetic recording medium. 3. A tape guide for restricting a running path of the tape-shaped magnetic recording medium is formed obliquely on a peripheral surface of the fixed drum, and the tape-shaped magnetic recording medium is fixed along the lead guide. 2. The vehicle travels obliquely over the drum and the peripheral surface of the rotary drum.
The magnetic head device according to the above.