JPH0744954A - Cylinder device for magnetic recording / reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cylinder device of a magnetic recording / reproducing apparatus capable of reducing the large wear that is the running load of the magnetic tape on the tape guide surface of the fixed cylinder and stabilizing the running of the magnetic tape. With the goal. A cylinder device of a magnetic recording / reproducing apparatus, comprising: a rotatable rotary cylinder 1 having a magnetic head; and a fixed cylinder 2 having a tape guide surface 5 for guiding a magnetic tape 4. Rolling roller portions 11 and 12 are provided at the protruding portion 7 and the detaching portion 8 of the magnetic tape 4 into the tape guide surface 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder device of a magnetic recording / reproducing apparatus using a rotary magnetic head such as a VTR,
In particular, the present invention relates to a cylinder device of a magnetic recording / reproducing apparatus for preventing the unstable running phenomenon of a magnetic tape due to a large contact pressure between the magnetic tape intruding and releasing portions on the tape guide surface of the fixed cylinder. is there.

[0002]

2. Description of the Related Art A cylinder device of a conventional magnetic recording / reproducing apparatus of this type, for example, a cylinder device of a VTR,
This will be described below with reference to FIGS. 7 and 8. 7 is a schematic front view of the main part of the cylinder device, and FIG. 8 is a schematic perspective view of the main part of the cylinder device.

The cylinder device of a VTR is composed of a rotatable rotary cylinder 1 and a fixed cylinder 2 which is fixed. The rotary cylinder 1 is provided with a magnetic head chip 3 to which a magnetic head (not shown) is attached, and the fixed cylinder 2 is provided with a tape guide surface 5 for guiding the running of the magnetic tape 4 and the tape guide surface 5. A lead portion 6 defining the lower end of the tape guide surface 5 is formed.

The magnetic tape 4 is guided by the tape guide surface 5 and the lead portion 6 and is obliquely wound around the rotary cylinder 1 and the fixed cylinder 2. The magnetic tape 4 wound in this way travels in the direction of arrow A, and the rotary cylinder 1 rotates at high speed in the direction of arrow B. With the rotation of the rotary cylinder 1, the magnetic head mounted on the magnetic head chip 3 is rotated. (Not shown) scans the magnetic tape 4 obliquely.

[0005]

However, in the case of the conventional VTR cylinder device, when aging (long-time operation) is applied, the protrusion 7 of the magnetic tape 4 on the tape guide surface 5 of the fixed cylinder 2 and the magnetic tape. Particularly large wear occurs at the detaching portion 8 of No. 4, the end portion 9 on the rotary cylinder 1 side, and the lead portion 6. Therefore, there is a problem that the contact pressure with the magnetic tape 4 is large in these portions, the contact area with the magnetic tape 4 increases, and the running of the magnetic tape 4 becomes unstable.

The present invention has been made in view of the above circumstances, and it is possible to reduce the large wear which is the running load of the magnetic tape on the tape guide surface of the fixed cylinder and to stabilize the running of the magnetic tape. An object of the present invention is to provide a cylinder device of a magnetic recording / reproducing device.

[0007]

According to a first aspect of the present invention, there is provided a cylinder device for a magnetic recording / reproducing apparatus, comprising a rotatable rotary cylinder having a magnetic head, and a fixed tape guide surface for guiding a magnetic tape. In a cylinder device of a magnetic recording / reproducing apparatus including a cylinder, a rotatable roller portion is provided at a portion where the magnetic tape enters and leaves the tape guide surface of the fixed cylinder.

A cylinder device of a magnetic recording / reproducing apparatus according to a second invention of the present application is a magnetic device having a rotatable rotary cylinder having a magnetic head and a fixed cylinder having a tape guide surface for guiding a magnetic tape. In the cylinder device of the recording / reproducing apparatus, concave portions are provided at the protruding portion and the detaching portion of the magnetic tape with respect to the tape guide surface of the fixed cylinder.

A cylinder device of a magnetic recording / reproducing apparatus according to a third invention of the present application is a magnetic device having a rotatable rotary cylinder having a magnetic head and a fixed cylinder having a tape guide surface for guiding a magnetic tape. In a cylinder device of a recording / reproducing apparatus, a taper portion is provided at an end of a tape guide surface of the fixed cylinder on the rotary cylinder side.

[0010]

In the cylinder device of the magnetic recording / reproducing apparatus according to the first invention of the present application, the magnetic tape can be smoothly moved by the rotatable roller portion provided on the fixed cylinder.

In the cylinder device of the magnetic recording / reproducing apparatus according to the second invention of the present application, by the recesses provided in the protruding portion and the detaching portion of the magnetic tape with respect to the tape guide surface of the fixed cylinder,
It is possible to reduce the contact pressure with the magnetic tape at the protruding portion and the detaching portion.

In the cylinder device of the magnetic recording / reproducing apparatus according to the third invention of the present application, a taper portion provided at an end of the fixed cylinder on the tape guide surface of the fixed cylinder causes the magnetic tape to be formed at the end of the rotary cylinder. The contact pressure can be reduced.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of a cylinder device of a magnetic recording / reproducing apparatus according to the present invention will be described below with reference to FIGS. 1 and 2 for a cylinder device of a VTR. Is attached and the description thereof is omitted. still,
FIG. 1 is a schematic front view of the main part of the cylinder device.
FIG. 3 is a schematic plan view of a main part of a fixed cylinder.

In the cylinder device of the VTR of this embodiment, roller portions 11 and 12 rotatably supported are provided at the protruding portion 7 and the detaching portion 8 of the magnetic tape 4 into the tape guide surface 5 of the fixed cylinder 2. There is. The roller parts 11 and 12 are
It is attached at a height position such that its outer peripheral portion smoothly continues with the tape guide surface 5.

In the cylinder device of the VTR constructed as described above, the roller portion 1 is provided at the protruding portion 7 and the detaching portion 8 of the magnetic tape 4 into the tape guide surface 5 of the fixed cylinder 2.
Even if the contact pressure between the magnetic tapes 1 and 12 and the magnetic tape 4 is large, the roller portions 11 and 12 rotate, so that the magnetic tape 4 can run smoothly.

Next, a second embodiment of the cylinder device of the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS. 3 and 4 for a VTR cylinder device. Is attached and the description thereof is omitted. still,
FIG. 3 is a schematic front view of the main part of the cylinder device.
FIG. 3 is a schematic plan view of a main part of a fixed cylinder.

The VTR cylinder device of this embodiment has a recess 13 for preventing the magnetic tape 4 from coming into contact with the tape guide surface 5 of the fixed cylinder 2 at the projecting portion 7 and the detaching portion 8 of the magnetic tape 4. , 14 are provided by cutting.

With this structure, the magnetic tape 4 is pressed in the direction of the tape guide surface 5 at the protruding portion 7 and the detaching portion 8 of the magnetic tape 4 into the tape guide surface 5 of the fixed cylinder 2. Here, the recesses 13, 1
Since the magnetic tape 4 is provided, the magnetic tape 4 is slightly bent, but the contact pressure between the tape guide surface 5 and the magnetic tape 4 is greatly reduced, and thus the magnetic tape 4 can run smoothly. it can.

Further, a third embodiment of the cylinder device of the magnetic recording / reproducing apparatus of the present invention will be described with reference to FIGS. 5 and 6 for a VTR cylinder device. The description is omitted.
5 is a schematic front view of the main part of the cylinder device,
FIG. 6 is an enlarged schematic side view of the main part of the cylinder device.

In the VTR cylinder device of this embodiment, a taper portion 15 is provided at the end 9 of the tape guide surface 5 of the fixed cylinder 2 on the rotary cylinder 1 side. Tapered part 15
Has a constant depth amount of about 5 μm from the inlet side to the outlet side of the magnetic tape 4, and the tapered portion 15 is also a turning surface like the other tape guide surfaces 5. The taper portion 15 may be formed so that the maximum depth amount is about 5 μm and gradually increases from the inlet side to the outlet side of the magnetic tape. However, as described above, the taper portion 15 has a certain depth amount. By doing so, it is possible to easily perform the taper processing, and it is possible to uniformly reduce the contact pressure with the magnetic tape 4.

With such a structure, the end 9 of the tape guide surface 5 of the fixed cylinder 2 on the rotary cylinder 1 side.
In, the magnetic tape 4 is pressed in the direction of the tape guide surface 5, but since the taper portion 15 is provided here, the magnetic tape 4 is slightly curved, but the tape guide surface 5 and the magnetic tape 4 are The contact pressure is greatly reduced, and therefore the magnetic tape 4 can run smoothly.

[0022]

In the cylinder device of the magnetic recording / reproducing apparatus according to the first invention of the present application, the magnetic tape can be smoothly moved by the rotatable roller portion provided on the fixed cylinder, and therefore the accuracy is high. A head scan can be obtained, and the image quality of recording and reproduction can be improved.

In the cylinder device of the magnetic recording / reproducing apparatus according to the second invention of the present application, the concave portion provided at the protruding portion and the detaching portion of the magnetic tape with respect to the tape guide surface of the fixed cylinder,
The contact pressure with the magnetic tape at the plunging portion and the detaching portion can be reduced, so that highly accurate head scan can be obtained and the image quality of recording and reproduction can be improved.

In the cylinder device of the magnetic recording / reproducing apparatus according to the third invention of the present application, a taper portion provided at an end portion of the fixed cylinder on the tape guide surface of the fixed cylinder causes a magnetic tape to be formed at the end portion of the rotary cylinder. The contact pressure can be reduced, and therefore, highly accurate head scan can be obtained and the image quality of recording and reproduction can be improved.

[Brief description of drawings]

FIG. 1 is a schematic front view showing the main part of a cylinder device of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention.

FIG. 2 is a schematic plan view of a main part showing a fixed cylinder in the first embodiment of the cylinder device of the magnetic recording / reproducing apparatus of the present invention.

FIG. 3 is a front view showing the main part of a second embodiment of the cylinder device of the magnetic recording / reproducing apparatus of the present invention.

FIG. 4 is a schematic plan view of a main part showing a fixed cylinder in a second embodiment of the cylinder device of the magnetic recording / reproducing apparatus of the present invention.

FIG. 5 is a schematic front view showing the main part of a third embodiment of the cylinder device of the magnetic recording / reproducing apparatus of the present invention.

FIG. 6 is an enlarged side view of the essential parts showing the third embodiment of the cylinder device of the magnetic recording / reproducing apparatus of the present invention.

FIG. 7 is a schematic front view showing the main part of a cylinder device of a conventional magnetic recording / reproducing apparatus.

FIG. 8 is a schematic perspective view of a main part showing a cylinder device of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 1 Rotating Cylinder 2 Fixed Cylinder 3 Magnetic Head Chip 4 Magnetic Tape 5 Tape Guide Surface 6 Lead 7 Intrusion 8 Detach 9 Rotating Cylinder End 11, 12 Roller 13, 14 Recess 15 Tapered

Claims (3)

[Claims] 1. A cylinder device of a magnetic recording / reproducing apparatus, comprising: a rotatable rotary cylinder having a magnetic head; and a fixed cylinder having a tape guide surface for guiding a magnetic tape, the tape guide surface of the fixed cylinder. A cylinder device for a magnetic recording / reproducing apparatus, characterized in that a rotatable roller portion is provided at a protruding portion and a detaching portion of a magnetic tape. 2. A cylinder device of a magnetic recording / reproducing apparatus comprising a rotatable rotary cylinder having a magnetic head and a fixed cylinder having a tape guide surface for guiding a magnetic tape, wherein the tape guide surface of the fixed cylinder. A cylinder device of a magnetic recording / reproducing apparatus, characterized in that recesses are provided in a protruding portion and a detaching portion of the magnetic tape to reduce the contact pressure with the magnetic tape. 3. A cylinder device of a magnetic recording / reproducing apparatus, comprising a rotatable rotary cylinder having a magnetic head, and a fixed cylinder having a tape guide surface for guiding a magnetic tape, wherein the fixed cylinder tape guide surface. A cylinder device of a magnetic recording / reproducing apparatus, wherein a taper portion is provided at an end portion of the rotating cylinder side to reduce a contact pressure with the magnetic tape.