JPH04268231A - Transducer for magnetic tape device - Google Patents

Abstract

PURPOSE:To prevent the recording and reproducing performance from deteriorating due to dust stuck to a magnetic tape under traveling by making a circumferential side surface of a transducer main body a vapor-deposited metallic surface and preventing the occurrence of static electricity due to contact with the magnetic tape. CONSTITUTION:The subject transducer has a ceramic transducer main body 5 in a discoid shape. Then, the circumferential side surface 6 of this ceramic transducer main body 5 is processed to be a vapor-deposited metallic surface, and at the same time, a great number of small holes 8 for jetting air are provided on the vapor-deposited metallic circumferential-side surface 6. In this case, since the transducer main body is provided with the metal evaporated surface on its circumferential side surface, the static electricity is not generated even when the magnetic tape under floating traveling over this circumferential side surface is brought into contact with the circumferential side surface, and hence dust does not stick to the magnetic tape under traveling owing to the static electricity.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transducer included in a magnetic tape device.

0002

2. Description of the Related Art A magnetic tape device is equipped with a transducer for detecting the running state of a magnetic tape when it runs forward or reverse. This transducer is placed in the tape running path between the magnetic head and the machine reel.

FIGS. 2(a) and 2(b) show a transducer included in a conventional magnetic tape device.

The present transducer has a ceramic transducer body 1 in the shape of a disc. The ceramic transducer main body 1 has a screw hole 2 in the center thereof for attachment to a magnetic tape device, and a large number of small holes 4 for air injection in the ceramic peripheral side surface 3.

In the magnetic tape device equipped with this transducer, when the magnetic tape that runs forward during recording passes through the magnetic head section, the transducer body 1
The film is wound onto a machine reel via the ceramic peripheral side 3 of the film. In addition, magnetic tapes that run in reverse during playback are
It moves to the magnetic head section via the ceramic circumferential side surface 3 of the transducer body 1.

As described above, when the magnetic tape runs on the ceramic circumferential surface 3 of the transducer body 1 during forward and reverse running, the magnetic tape is affected by the air pressure ejected from each of the small holes 4 in the ceramic circumferential surface 3. Due to the pressure (pressure pressure), it travels in a slightly floating state without contacting the ceramic circumferential surface 3.

[0007]

[Problems to be Solved by the Invention] However, as in the conventional transducer described above, the transducer main body 1
When the circumferential surface 3 of the magnetic tape is a ceramic surface, static electricity is generated if the magnetic tape comes into contact with the ceramic circumferential surface 3 while slightly floating on the ceramic circumferential surface 3. In some cases, surrounding dust adhered to the magnetic tape, reducing recording and playback performance.

When the magnetic tape runs on the ceramic circumferential surface 3 while slightly floating, for example, the ceramic circumferential surface 3
If there is a small hole 4 in which air pressure is weak and the magnetic tape cannot be levitated due to clogging or the like, the magnetic tape will come into contact with the ceramic circumferential surface 3 at that portion.

Therefore, it is an object of the present invention to prevent the generation of static electricity even if the magnetic tape flying and traveling on the circumferential surface of the transducer body comes into contact with the circumferential surface. It is an object of the present invention to provide a transducer for a magnetic tape device which prevents dust from adhering to the surface due to static electricity.

0010

SUMMARY OF THE INVENTION The present invention relates to a transducer for a magnetic tape device having a disc-shaped ceramic transducer body.

[0011] In order to achieve the above object, the present invention is characterized in that the circumferential side of the transducer body is a vapor-deposited metal surface.

0012

[Operation] According to the above structure, the magnetic tape runs while slightly floating over the vapor-deposited metal circumferential surface of the transducer body during forward and reverse running. Therefore, even if the running magnetic tape comes into contact with the circumferential surface of the transducer body, static electricity is not generated, and therefore, dust does not adhere to the magnetic tape due to static electricity.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a transducer for a magnetic tape device according to the present invention, (a) is a plan view thereof, and (b)
) is a side view.

The present transducer has a disc-shaped ceramic transducer body 5. Then, the circumferential side surface 6 of the ceramic transducer body 5 is made of a vapor-deposited metal surface, and the transducer body 5
It has a structure in which a screw hole 7 for connecting to a magnetic tape device is provided in the center of the device, and a large number of small holes 8 for blowing out air are provided in the peripheral side surface 6 of the vapor-deposited metal.

In this transducer, the magnetic tape runs on the vapor-deposited metal circumferential side 6 of the transducer body 1 while being slightly floated by the air pressure ejected from each small hole 8. Even if it comes into contact with the vapor-deposited metal peripheral surface 6, static electricity is not generated. This prevents dust from adhering to the running magnetic tape due to static electricity.

[0017]

[Effects of the Invention] As explained above, in the transducer for a magnetic tape device of the present invention, since the circumferential side of the ceramic transducer body is a metal-deposited surface, the circumferential side of the transducer body is coated with metal. Even if the floating magnetic tape comes into contact with the circumferential surface, no static electricity is generated, and therefore, no dust is attached to the running magnetic tape due to static electricity.

[0018] Therefore, there is no possibility that the recording/reproducing performance would be degraded due to dust adhering to the running magnetic tape as in the prior art.

[Brief explanation of the drawing]

FIG. 1 shows a transducer for a magnetic tape device according to an embodiment of the present invention, (a) is a plan view thereof, and (b)
) is a side view.

FIG. 2 shows a conventional transducer for a magnetic tape device, in which (a) is a plan view and (b) is a side view.

[Explanation of symbols]

5 Transducer body 6 Vapor-deposited metal peripheral side

Claims (1)

[Claims] 1. A transducer for a magnetic tape device having a disc-shaped ceramic transducer body, characterized in that a circumferential side of the transducer body is a vapor-deposited metal surface. Transducer for.