JPH05101494A - Rotary head cylinder - Google Patents

Abstract

PURPOSE:To reduce a noise generated at the time when a magnetic head is separated from a tape and also to improve the sound quality at the time of video recording by providing a protrusion on the part where the head is separated from the magnetic tape on a lower cylinder in the rotary head assembling body of VTR, provided with a rotary head disk between the fixed upper cylinder and lower cylinder. CONSTITUTION:A vibration of the tape generated at the time when the tape 4 lifted up by the magnetic head 5 is going to return to the initial state, is eliminated by providing the protrusion 6 on the head separating part from the magnetic tape on the fixed lower cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head cylinder for reducing noise generated when a magnetic head separates from a tape and improving sound quality during recording.

[0002]

2. Description of the Related Art In recent years, the miniaturization of analog VTRs and the improvement in image quality have advanced, and the need for developing a portable type in digital VTRs has been greatly highlighted.

However, the digital VTR is
Since it requires a higher recording density than an analog VTR, the number of revolutions of the magnetic head part is as high as 600 rpm, and the tape vibration is excited by the shock when the recording head separates from the tape, causing a tapping noise. Called noise is generated.

A conventional rotary head cylinder for a digital VTR will be described below. FIG. 4 is a perspective view of a conventional rotary head cylinder as seen from the direction in which the tape is ejected from the cylinder. In FIG. 4, 1 and 3 are fixed cylinders, 2 is a rotary cylinder attached between them, and a magnetic head 5 is attached between the fixed lower cylinder 3 and the fixed lower cylinder 3.
It rotates in the direction indicated by arrow B together with the rotary cylinder 2. The magnetic tape 4 is spirally wound around the outer peripheral surface of the cylinder and advances in the direction indicated by the arrow A, and the magnetic head 5 separates from the upper edge of the tape 4. FIG. 5A is an enlarged vertical cross-sectional view of the cylinder on the tape output side.
(B) is a view of the cross section of the cylinder along the magnetic head scanning line as seen from above.

[0005]

However, in the above-mentioned conventional structure, when the magnetic head 5 separates from the tape 4, the tape is rapidly deformed as shown in FIG. It becomes an exciting force and excites the tape vibration in the area D portion shown in FIG. 5B, and noise called a tapping sound shown in E of FIG. 6 is generated.

In particular, the digital type VTR has a high noise level due to the high rotational speed of the magnetic head 5, and is a portable type VT in which the microphone and the traveling system are integrated.
In R, the noise is directly taken in by the recording microphone or R, which causes a problem that the sound quality is deteriorated.

The present invention solves the above-mentioned conventional problems, and an object thereof is to provide a noise reduction effect called a tapping noise.

[0008]

In order to achieve this object, the rotary head cylinder of the present invention is characterized in that a projection is provided on the head discrete portion from the magnetic tape of the fixed lower cylinder.

[0009]

With this structure, the tape vibration generated when the head is separated from the tape is suppressed, and the vibration called tapping sound caused by the vibration can be reduced.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

In FIG. 1, numeral 6 is a tape 4 of the lower cylinder 3 which is fixed.
2 is a protrusion newly provided in a portion away from the magnetic head 5, and the tape lifted by the magnetic head 5 when the magnetic head 5 is detached from the tape 4 as shown in FIG. As the projection 6 is further lifted up in the area 4, a region C, which is floating from the cylinder as shown in FIG. 2B, is generated. Magnetic head 5
Is separated from the tape in the area C, and the vibrating tape is limited to the area C due to the impact when the head is separated, and when the protrusion 6 shown in FIG. 5B is not attached, the magnetic head is separated. Since the area is limited as compared with the vibrating area D, the noise level generated by the tape vibration is also suppressed, and the level of the tapping sound is reduced as shown in FIG. 3E. The projection 6 may be part of the lower cylinder as shown in FIG.

[0012]

As described above, according to the present invention, the rotary head disk is provided between the fixed upper cylinder and the lower cylinder.
By providing a protrusion in the head discrete portion of the magnetic tape of the lower cylinder of the TR rotary head assembly, it is possible to reduce the noise generated when the magnetic head separates from the tape and to improve the sound quality during recording. A rotary head cylinder can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view of a rotary head cylinder according to an embodiment of the present invention.

FIG. 2 (a) is an enlarged vertical sectional view of a main part of a rotary head cylinder in the same embodiment. (B) is an enlarged sectional view of a main part of a rotary head cylinder in the same embodiment.

FIG. 3 is a frequency response waveform in the example.

FIG. 4 is a perspective view of a rotary head cylinder in a conventional example.

FIG. 5A is an enlarged vertical sectional view of a main part of a rotary head cylinder in a conventional example. FIG. 5B is an enlarged horizontal sectional view of a main part of a rotary head cylinder in a conventional example.

FIG. 6 is a frequency response waveform diagram in a conventional example.

FIG. 7 is a perspective view of a rotary head cylinder according to an embodiment of the present invention.

FIG. 8 is an enlarged vertical cross-sectional view of a main part of a rotary head cylinder according to an embodiment of the present invention.

[Explanation of symbols]

 1 Upper cylinder 2 Middle cylinder 3 Lower cylinder 4 Tape 5 Magnetic head 6 Protrusion

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Taku Kosai 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (1)

[Claims] 1. A rotary head characterized in that a protrusion is provided in a head discrete portion from a magnetic tape of a lower cylinder of a rotary head assembly of a VTR in which a rotary head disk is provided between a fixed upper cylinder and a lower cylinder. Cylinder.