JP2000011501A - Rotating drum device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotating drum device capable of improving the contact between magnetic heads and a magnetic information recording medium and also prolonging service lives of the magnetic heads. SOLUTION: This device is a rotating drum device consisting of a fixed drum and a rotating drum 12 which is arranged rotatably with respect to the fixed drum and which records and reproduces information while sliding on a magnetic information recording medium TP. In this case, magnetic head holding pats 22 for attaching magnetic heads, notched parts 21 formed on the outer peripheral surfaces 12a of the drum 12 in order to make tip parts of the held magnetic heads protrude form the outer peripheral parts 21a and ventilating grooves 23 which are connected to the notched parts 21 and which are for making air flow in from the notched parts 21 or for making air in the drum 12 flow are formed in the drum 12.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a rotary drum device, and more particularly to a rotary drum device for improving the contact between a magnetic head mounted on a rotary drum and a magnetic information recording medium.

[0002]

2. Description of the Related Art A rotary magnetic head device is used to record information on a magnetic tape which is a tape-shaped magnetic information recording medium or to reproduce information from the magnetic information recording medium. This rotating magnetic head device is mounted on, for example, a video tape recorder and includes a fixed drum and a rotating drum. The rotating drum is provided with at least one magnetic head, and records and reproduces information by sliding the magnetic head with a magnetic tape.

FIG. 7 shows an example of a conventional rotary drum. The rotary drum 1 will be described with reference to FIG. The rotary drum 1 shown in FIG. 7 is formed with two notches 2, 2 and magnetic head holders 3, 3, respectively. 7C, the notch 2 is formed on the outer peripheral surface 5 of the rotary drum 1. As shown in FIG. 7B, a magnetic head holder 3 is provided around the notch 2. Is formed. The magnetic head H is adhered to a base, and the base is fixed to the magnetic head holding unit 3 with screws or the like. The tip portion of the magnetic head H, that is, the sliding surface on which the magnetic gap is formed projects from the notch 2 to the outer peripheral surface 5. The shaft of the rotary drum device is fixed to the shaft insertion hole 4 by press-fitting, shrink fitting or the like, and the rotary drum 2 rotates together with the shaft.

FIGS. 8 and 9 are conceptual diagrams showing the operation of a conventional rotary drum device for recording / reproducing information on a magnetic tape. Referring to FIGS. 8 and 9, an example of the operation of the rotary drum device will be described. Will be described. When recording and reproducing information on the magnetic tape TP, the magnetic tape TP comes into contact with the rotating rotary drum 1 and the magnetic head H protruding from the outer peripheral surface 5 of the rotary drum 1 Slides with.
Then, reproduction is performed by the magnetic head H reading the magnetic field of the magnetic tape TP, and information is recorded by writing the magnetic field on the magnetic tape TP.

[0005]

However, when the rotary magnetic head device is used for a long time, the surface on which the magnetic head H slides on the magnetic tape TP is worn. In particular, as shown in FIG. 9, wear progresses from a portion H1 side of the magnetic head H in the rotation direction of the rotary drum 1. That is, the magnetic head H
Is in contact with the magnetic tape TP while rotating, the portion H1 of the magnetic head H that first contacts the magnetic tape TP
Is in a state of being easily worn. If the wear of only the portion H1 progresses, the contact state between the magnetic head H and the magnetic tape deteriorates, and there is a problem that sufficient recording / reproducing characteristics cannot be obtained. Further, since the wear proceeds from the portion H1 of the magnetic head H, the amount of wear in the central portion (magnetic gap portion) of the magnetic head H increases when the magnetic head records and reproduces on the magnetic tape TP. Therefore, there is a problem that the life of the magnetic head is shortened.

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to provide a rotary drum device for improving the contact between a magnetic head and a magnetic information recording medium.

[0007]

SUMMARY OF THE INVENTION According to the present invention, there is provided a fixed drum and a rotatable arrangement with respect to the fixed drum, wherein information is recorded by sliding on a magnetic information recording medium. A rotating drum device comprising: a rotating drum to be reproduced; a rotating drum having a magnetic head holding portion for mounting a magnetic head, and a rotating drum having a tip portion of the held magnetic head protruding from an outer peripheral surface. A notch formed with respect to the outer peripheral surface, a ventilation groove connected to the notch and allowing air to flow into the rotary drum from the notch or to flow air out of the rotary drum, Is achieved by a rotating drum device in which is formed.

According to the present invention, when the magnetic head and the magnetic tape slide, air flows from the notch into the ventilation groove,
Alternatively, air flows out from the ventilation groove toward the notch. The inflow or outflow air causes the magnetic information recording medium to move in a direction in which the magnetic information recording medium slides on or moves away from the magnetic head. As a result, the contact between the magnetic head and the magnetic information recording medium is improved, the recording / reproducing characteristics are improved, and the life of the magnetic head can be extended.

[0009]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 is a perspective view of a preferred embodiment of the rotary drum device of the present invention, FIG. 2 is a top view of the rotary drum device, and FIG. 3 is a sectional view of the rotary drum device. The rotary drum device 10 will be described in detail with reference to FIGS. The rotating drum device 10 includes a fixed drum 11, a rotating drum 12, a motor M, and the like. A motor M is arranged below the fixed drum 11, and a rotating drum 12 is arranged above the fixed drum 11. The rotating drum 12 and the motor M are connected via a shaft 14, and the fixed drum 11 connects the shaft 14 to a bearing 15 shown in FIG.
To be rotatable. Fixed drum 11 of FIG.
A lead guide 13 is formed on the outer peripheral surface of the magnetic tape TP, and the magnetic tape TP is fed obliquely from the inlet side IN to the outlet side OUT along the lead guide 13 toward the arrow E.

The magnetic head 20 is fixed to the rotary drum 12 via a base by screws or the like.
Is provided between the fixed drum 11 and the rotating drum 12. A notch is formed on the outer peripheral surface of the rotating drum 12, and the magnetic head H is moved from the notch to the rotating drum 12.
Protrudes from the outer peripheral surface. The rotating drum 12 rotates in the direction of the arrow R1 with respect to the fixed drum 11 by the operation of the motor M. Then, the magnetic head H also rotates, and performs recording or reproduction while sliding on the magnetic tape TP. At this time, the magnetic tape TP moves along arrow E along the lead guide portion 13.
Since the magnetic head H travels obliquely in the direction, the magnetic head H is helically scanned to record and reproduce information on and from the magnetic tape TP.

FIG. 4 shows a configuration diagram of the rotary drum 12, and the rotary drum 12 will be described in detail with reference to FIG. The rotary drum 12 shown in FIG. 4 is formed with two notches 21, a magnetic head holder 22, a ventilation groove 23, and the like. 4C is formed on the outer peripheral surface 12a of the rotary drum 21, and a magnetic head holding portion 22 is formed near the notch 21 in FIG. 4A. A base to which the magnetic head H is fixed is fixed to the magnetic head holding portion 22 with screws or the like, and the magnetic head H is provided so that a front end portion protrudes from the notch 21 to the outer peripheral surface 12a. .

A ventilation groove 23 is formed from the notch 21 in FIG. 4B to the inner peripheral surface side of the rotary drum 12, and the ventilation groove 23 includes a first ventilation groove 23a and a second ventilation groove 23b.
Consists of First ventilation groove 23a and second ventilation groove 23b
Are formed so as to sandwich the magnetic head holding portion 22, and the air flows out from the rotating drum 12 or flows into the rotating drum 12. The notch 21 is provided with a partition member 24 for partitioning the first ventilation groove 23a and the second ventilation groove 23b, and the first ventilation groove 23a and the second ventilation groove 23b have different directions or flow rates. Air flows. The first ventilation groove 23 a and the second ventilation groove 23 b are provided radially from the notch 21 toward the inner peripheral side of the rotary drum 12. Thereby, the first ventilation groove 23
a and the air flow in the second ventilation groove 23b can be improved. In FIG. 4B, the shape and the depth of the first ventilation groove 23a and the second ventilation groove 23b are formed to be substantially the same in consideration of ease of molding.

FIG. 5 shows that the rotary drum device 10 is a magnetic tape T
FIG. 6 is a configuration diagram illustrating a state where information is recorded or reproduced with respect to P. An operation example of the rotary drum device 10 will be described in detail with reference to FIGS. 1 to 5. First, the rotating drum 12 is rotated by the operation of the motor M in a state where the magnetic tape TP is wound on the outer peripheral surface of the rotating drum device 10 as shown in FIG. Then, the magnetic head H protruding from the rotary drum 12 records information on the magnetic tape TP or reproduces information recorded on the magnetic tape TP.

When the tip of the magnetic head H slides on the magnetic tape TP, as shown in FIG. 5, for example, air flows from the left side of the magnetic head H in the direction of arrow D1 from the rotating drum, and from the right side. Air flows in the direction of arrow D2. Thereby, the magnetic tape T is located on the left side of the magnetic head H.
P is pushed in the direction of arrow Y1 by air, and the magnetic head H
On the right side, the magnetic tape TP is drawn in the direction of arrow Y2. Thus, the contact between the magnetic head H and the magnetic tape TP is performed symmetrically, and recording or reproduction on the magnetic tape TP can be performed efficiently.

That is, when the magnetic tape TP and the magnetic head H slide in the conventional rotary drum 1 shown in FIG. 9, the magnetic tape TP contacts the magnetic tape TP on the left side, which is the rotation direction of the magnetic head H (the rotation direction of the rotary drum 12). And does not touch the right side. On the other hand, in FIG. 5, the first ventilation groove 23a
Flows out in the direction of arrow D1, and the magnetic tape TP is pushed in the direction of arrow Y1. On the other hand, the second ventilation groove 23
The magnetic tape TP is drawn in the direction of the arrow Y2 by the air flowing in the direction of the arrow D2 from b. Therefore, the contact between the magnetic head H and the magnetic tape TP is improved. Also,
Since the magnetic tape TP can be applied almost symmetrically to the magnetic head H, the wear of the magnetic head H also wears out equally as shown in FIG. This makes it possible to eliminate recording or reproduction defects due to uneven wear of the magnetic head H, and at the same time, extend the life of the magnetic head H.

According to the above embodiment, even when the magnetic head H is used for a long time, the wear of the magnetic head proceeds evenly in the left and right directions, so that the magnetic head mounted on the rotating drum after the height adjustment is performed. Makes vertical contact with the magnetic tape TP wound around the rotating drum device,
Since the wear of the magnetic head proceeds at right angles to the magnetic head, the contact state of the magnetic tape is improved, and the signal can be efficiently transmitted from the magnetic head to the magnetic tape or from the magnetic tape to the magnetic head.

Also, the wear of the tip of the magnetic head H progresses equally to the left and right without progressing only on one side,
The life can be extended as compared with the case where only one side wears. Furthermore, even in a magnetic head in which a plurality of magnetic heads are mounted on one base, it is possible to equalize the sub-geography of each chip with respect to the magnetic tape TP, thereby improving signal transmission efficiency. It is possible to prevent only one head chip from being worn first.

Incidentally, the present invention is not limited to the above embodiment. In FIG. 4, the ventilation groove 23 is the first ventilation groove 2.
3a and a second ventilation groove 23b.
It is also possible to form only one side, such as forming only the ventilation groove 23b and not forming the first ventilation groove 23a. In FIG. 4, the first ventilation groove 23a and the second ventilation groove 23b have shapes that are symmetrical with respect to the magnetic head holding portion 22, but have different shapes in order to adjust the flow rates of the air. It may be. Further, the first ventilation groove 23a and the second ventilation groove 2
The depth 3b may be different from each other in order to adjust the flow rates of the two airs.

[0020]

As described above, according to the present invention,
It is possible to provide a rotary drum device that improves the contact between the magnetic head and the magnetic information recording medium and extends the life of the magnetic head.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a preferred embodiment of a rotary drum device of the present invention.

FIG. 2 is a top view showing a preferred embodiment of the rotary drum device of the present invention.

FIG. 3 is a sectional view showing a preferred embodiment of the rotary drum device of the present invention.

FIG. 4 is a configuration diagram showing a state of a rotating drum in the rotating drum device of the present invention.

FIG. 5 is a configuration diagram showing a portion around a magnetic head in the rotary drum device of the present invention.

FIG. 6 is a configuration diagram showing a portion around a magnetic head in the rotary drum device of the present invention.

FIG. 7 is a configuration diagram showing an example of a conventional rotary drum.

FIG. 8 is a configuration diagram showing a portion around a magnetic head in a conventional rotating drum.

FIG. 9 is a configuration diagram showing a portion around a magnetic head in a conventional rotating drum.

[Explanation of symbols]

10: rotating drum device, 11: fixed drum, 1
2 ... rotating drum, 21 ... notch, 22 ...
-Magnetic head holding part, 23 ... vent groove, 23a ...
1st ventilation groove, 23b ... 2nd ventilation groove, H ... magnetic head.

Claims (4)

[Claims] A rotating drum having a fixed drum and a magnetic head rotatably disposed with respect to the fixed drum and recording and reproducing information by sliding on a magnetic information recording medium;
In the rotary drum device, a magnetic head holding portion for mounting a magnetic head is formed on the rotary drum, and a tip portion of the held magnetic head is formed on the outer circumferential surface of the rotary drum so as to protrude from the outer circumferential surface. And a ventilation groove connected to the notch and allowing air to flow into or out of the rotary drum from the notch. Characterized rotary drum device. 2. The ventilation groove according to claim 1, wherein the ventilation groove comprises a first ventilation groove and a second ventilation groove, and the first ventilation groove and the second ventilation groove are formed so as to sandwich the magnetic head holding portion. Rotary drum device. 3. The first ventilation groove and the second ventilation groove have different shapes or the depths of the first ventilation groove and the second ventilation groove because different air flows into and out of the first ventilation groove and the second ventilation groove, respectively.
A rotary drum device according to claim 1. 4. The rotary drum device according to claim 2, wherein the first ventilation groove and the second ventilation groove are formed radially from the notch toward the inner peripheral surface.