JP2532436Y2 - Rotating head type magnetic recording / reproducing device - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a rotary cylinder having a magnetic head mounted so that its tip protrudes from the outer peripheral surface.
The magnetic tape is arranged coaxially on a cylindrical fixed cylinder, and the magnetic tape is caused to run in a state of being spirally wound along a rotation locus of the magnetic head at a predetermined winding angle, and the magnetic head is driven by the magnetic head. The present invention relates to a rotary head type magnetic recording / reproducing apparatus for recording / reproducing a signal on / from a tape, and in particular, the shape of the fixed cylinder is improved so that a good contact relationship between the magnetic head and the magnetic tape can be obtained. It is.

[0002]

2. Description of the Related Art FIGS. 4 and 5 show the essential parts of a conventional two-head type rotary head type magnetic recording / reproducing apparatus.
Is a rotary cylinder in which the tip of the magnetic head 2 protrudes by 30 μm from the outer circumference, and is rotatably driven coaxially on a cylindrical fixed cylinder 3. Reference numeral 4 denotes a magnetic tape, which is spirally wound over a predetermined winding angle range along the rotation locus of the magnetic head 2 and travels.

[0003] As the magnetic head 2 rotates, signals are sequentially recorded and reproduced on the magnetic tape 4. One problem with such a rotating head type magnetic recording / reproducing apparatus is that the magnetic head 2 repeatedly contacts and separates from the magnetic tape 4 as the rotating cylinder 1 rotates, so that the magnetic tape 4 generates vibration. It is to be.

In order to solve this problem, a protrusion 5 having a height of 1.2 to 2.0 times the amount of protrusion of the magnetic head 2 is formed on the fixed cylinder 3 outside the above-mentioned magnetic tape winding angle range. In some cases, the above-described vibration is absorbed by bringing the magnetic tape 4 into contact with the projection 5.

[0005]

However, in the above configuration, a gap 6 is formed between the magnetic tape 4 and the fixed cylinder 3 near the projection 5 as shown in FIG. Vibration occurred in the tape 4, and the contact between the magnetic head and the magnetic tape in the gap was not always good.

SUMMARY OF THE INVENTION The present invention provides a specific configuration that can achieve a stable recording / reproducing operation with less vibration by a simple configuration.

[0007]

SUMMARY OF THE INVENTION A rotary head type magnetic recording / reproducing apparatus according to the present invention provides a fixed cylinder outside a predetermined winding angle range of a magnetic tape by 1.2 to 2.0 times a projection amount of a magnetic head .
Forming a first protrusion having a height ,
2 to 15 ° continuously with the first projection within the attachment angle range
Of the protrusion amount of the magnetic head over the winding angle range of
A second projection having a height of 0.5 to 0.8 times is formed.

[0008]

According to the above construction, the magnetic head 2 is not abruptly brought into contact with or separated from the magnetic tape 4 by the rotation of the rotary cylinder 1 by the first projection, and the vibration of the magnetic tape 4 is not repeated. Occurrence is also reduced, and since the second projection is formed following the first projection, a large gap is formed between the magnetic tape 4 and the cylinder near the first projection. Stable recording and reproduction can be expected without occurrence.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 to 3, reference numeral 1 denotes a rotary cylinder on which a magnetic head 2 is arranged, 3 denotes a cylindrical fixed cylinder,
Reference numeral 4 denotes a magnetic tape, and reference numeral 5 denotes a first projection. The above configuration is the same as the above-described conventional configuration.

The difference from the conventional structure is that the second protruding portion 7 having a height smaller than the protruding amount of the magnetic head 2 is provided within the tape winding angle range, following the first protruding portion 5. 2 °
The point is that it is formed over １５15 °.

According to this configuration, due to the presence of the second protrusion 7, the large gap 6 between the magnetic tape 4 and the cylinder also exists near the first protrusion 5, as shown in FIG.
No vibration occurs, the vibration of the magnetic tape is reduced, and stable recording and reproduction can be expected.

As a result of various experiments, the height of the second projection 7 is preferably about 0.5 to 0.8 times the amount of protrusion of the magnetic head, and when it exceeds 0.8 times, the pressure contact force between the magnetic head and the tape is increased. When the ratio is 0.5 times or less, the effect of narrowing the gap between the magnetic tape 4 and the cylinder is negligible.

[0013]

[Effects of the Invention] As described above, according to the present invention, the magnetic head
First protrusion having a height of 1.2 to 2.0 times the protrusion amount
2 to within the specified winding angle range of the magnetic tape.
Magnetic head over a 15 ° magnetic tape wrap angle range
Second protrusion having a height of 0.5 to 0.8 times the protrusion amount of the
By be called, simple construction form, a vibration of the magnetic tape which has been a conventional problem can be eliminated relief, in which a stable recording and reproduction can be expected.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a main part of an embodiment of a rotary head type magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a sectional side view of a main part of the embodiment.

FIG. 3 is a cross-sectional plan view of a main part of the embodiment.

FIG. 4 is a perspective view showing a main part of an example of a conventional rotary head type magnetic recording / reproducing apparatus.

FIG. 5 is a sectional view of a main part of the conventional example.

FIG. 6 is a fragmentary plan view of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rotating cylinder 2 Magnetic head 3 Fixed cylinder 4 Magnetic tape 5 First projection 6 Air gap 7 Second projection

Claims (1)

(57) [Scope of request for utility model registration] 1. A rotary cylinder on which a magnetic head is mounted so that its tip protrudes from an outer peripheral surface is coaxially arranged on a cylindrical fixed cylinder, and a magnetic tape is previously moved along a rotation locus of the magnetic head. In a rotary head type magnetic recording / reproducing apparatus which runs in a state of being spirally wound by a predetermined predetermined winding angle and records / reproduces a signal on / from the magnetic tape by the magnetic head, the rotary head outside the predetermined winding angle range. The fixed cylinder has a protrusion of 1.2
Forming a first protrusion having a height of ~ 2.0 times, and connecting to the first protrusion within the winding angle range.
The magnetic head over a winding angle range of 2 to 15 °.
A rotary head type magnetic recording / reproducing apparatus characterized in that a second projection having a height of 0.5 to 0.8 times the projection amount of the second projection is formed.