JP2532549B2 - Magnetic recording / reproducing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus which forms an arcuate recording track on a recording medium and performs recording or reproduction on the recording medium.

2. Description of the Related Art Conventionally, when performing high-density recording in this type of magnetic recording / reproducing apparatus, a so-called helical scan method has been used in which a linear recording track having a certain inclination with respect to the longitudinal direction of the recording medium is formed. . In this method, the magnetic head scans the recording track during reproduction, and the recorded content is converted into an electric signal. Therefore, in order to enable this helical scan, in a magnetic recording / reproducing apparatus, a magnetic head is attached to the side surface of a rotary cylinder that can scan in a direction having a certain inclination with respect to the feed direction of the recording medium, and the recording medium is rotated by the rotary cylinder. Is configured to wrap around the side of the. However, the above structure requires a sophisticated loading mechanism and a tape path for winding the recording medium around the rotary cylinder, and the structure is complicated.

Therefore, for example, as proposed in JP-A-62-159392, without winding the recording medium around the rotary cylinder,
Conventionally, a method of forming recording tracks in an arc shape has been considered. FIG. 5 shows the main running portion, and FIG. 6 shows the tape pattern. In the figure, 1 is a rotary drive shaft, 2
Is a rotary cylinder for mounting the magnetic head 3, and 4 is a recording medium. Reference numeral 5 denotes a recording medium guide plate provided at a position opposed to each other with the rotary cylinder 2 and the recording medium 4 interposed therebetween.
The storage medium 4 has long grooves 5a and 5b along the tape running direction 7 at portions facing the both ends 4a and 4b in the width direction. Pressing plates 6 are provided at both ends of the recording medium guide plate 5 in the recording medium running direction 7 so as to sandwich the recording medium and the holding plate 6, and convex portions 6a and 6b provided at both ends of the recording medium width direction perform recording. The medium guide plate 5 is configured to engage with the long grooves 5a and 5b.

In the above configuration, the recording medium guide plate 5 and the recording medium 44 running in the rotary cylinder 2 are pressed by the holding plates 6 at both ends of the recording medium guide plate 5, and both ends 4a and 4b thereof are guided by the recording medium guide. Since it can be pushed and bent to the plate 5 side,
The arc-shaped track can be formed without deforming the recording medium 4 or damaging both ends by the magnetic head 3 of the rotating cylinder 2.

However, in this configuration, both ends of the recording medium 4 are forcibly pressed and bent, and the magnetic head and the recording medium are separated from each other at both ends. Although the deformation of the part can be avoided, in the running system, the forced bending and the return to the normal state where there is no deformation in the tape width direction in the vicinity of the reel are performed, and damage at both ends of the recording medium 4 cannot be avoided. . Particularly, when the recording medium 4 is run at a high speed, this bending and the return to the normal state are repeated, and the damage to the recording medium especially at both ends thereof becomes large.

The lower end of the recording medium is important for ensuring the relative position of the recording medium 4 and the magnetic head 3 and ensuring compatibility,
In this conventional configuration, the position of the recording track from the lower end of the recording medium tends to be inaccurate due to the bent state.

Therefore, the present invention provides a recording medium guiding means for avoiding deformation at both ends of the recording medium by the magnetic head without adding a forcible bending means to the recording medium.

Means for Solving the Problems The present invention is mounted on a rotary cylinder having a rotary shaft perpendicular to a recording surface of a magnetic tape, and the rotary cylinder forming a plurality of substantially arcuate recording tracks on the magnetic tape. A magnetic recording / reproducing apparatus including a magnetic head, the first magnetic tape guiding means for guiding the magnetic tape to a position where the magnetic tape can come into contact with the magnetic head on a plane parallel to the plane of rotation of the rotary cylinder; The magnetic tape has a second magnetic tape guide means spaced apart from a plane parallel to the plane of rotation and guided to a position where the magnetic tape does not come into contact with the magnetic head, and the magnetic head is at a starting point of contact with the magnetic tape. The magnetic tape at the intersection of the edge of the magnetic tape in the width direction of the magnetic tape and the rotation locus of the magnetic head which is close to the magnetic tape is guided by the second magnetic tape guide means. The magnetic recording / reproducing apparatus is characterized by being guided.

Action Since the recording medium in the portion forming the arc-shaped recording track is guided parallel to the plane of rotation of the rotary cylinder, the magnetic head can form an arc-shaped recording locus on the recording medium. On the other hand, the recording medium at the intersection of the rotation locus of the magnetic head and the end of the recording medium is guided by the second recording medium guiding means, and is therefore separated from the magnetic head. Therefore, the point at which the magnetic head starts contacting the recording medium is not at the end of the recording medium but at a position slightly closer to the center of the recording medium than the end of the recording medium, and deformation of the end of the recording medium by the magnetic head can be avoided.

Embodiment An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of a recording medium 13 (hereinafter referred to as a magnetic tape) running means of the present invention. Fig. 2 is a front view of the rotary cylinder.
The rotation locus 11a of the magnetic head 11 and the magnetic head 11 are indicated by imaginary lines. Reference numeral 12 denotes a mounting plate of the magnetic head 11, which is arranged in four equal parts on the outer circumference of the rotary cylinder 10 together with the magnetic head 11, so that the phase shift angle of the magnetic head 11 is 90 degrees. Reference numeral 18 indicates the traveling direction of the magnetic tape 13 during recording and reproduction. Reference numeral 19 indicates the rotation direction of the rotary cylinder 10.

The recording locus on the magnetic tape 13 by the magnetic head 11 is substantially arcuate, and the recording width is 95 degrees in terms of the rotation angle of the rotary cylinder 10, so that the overlap recording section of 5 degrees is continuous. Can record signals. Reference numeral 14 is a rotary drive shaft of the rotary cylinder 10. Reference numerals 15 and 16 are rotary posts for guiding the magnetic tape 13, and 17 is a tape guide for guiding the magnetic tape 13 on a plane parallel to the rotation plane of the rotary cylinder 10.

The tape guide 17 includes a first tape guide portion 17b parallel to the rotation plane of the rotary cylinder 10 and the first tape guide portion 1b.
Arc-shaped second tape guide portion formed continuously with 7b
It consists of 17a and 17c. The line A is a line which passes through the intersection of the rotation locus 11a of the magnetic head 11 and the magnetic tape 13 and is perpendicular to the end 13c of the magnetic tape 13. Line B is magnetic head 11
Is a line that passes through the recording start point of the magnetic tape 13 and is perpendicular to the end 13c of the magnetic tape 13. FIG. 4 shows a partially enlarged view of the vicinity of the tape guide 17. In the section E, the first tape guide portion 17b and the magnetic tape 13b guided by the first tape guide portion 17b,
The section F is the second tape guide portion 17a and the magnetic tape 13a guided by the second tape guide portion 17a. At the position of the above-mentioned line B, the magnetic tape 13 is the magnetic tape 13b guided by the first tape guide portion 17b. On the other hand, the line A is the position of the magnetic tape 13a guided by the second tape guide portion 17a.
Line C shows the rotation trajectory of the tip of the magnetic head 11, so
The intersection D between the line C and the magnetic tape 13a indicates the head touch start point. Since the intersection point B is located between the lines A and B, the magnetic head 11 has the end portion 13 of the magnetic tape 13.
From c, abutting will start at a position slightly closer to the center of the tape. In other words, the end 13c of the magnetic tape 13 and the magnetic head 11 are not in contact with each other.

FIG. 3 shows the second embodiment. A tape guide 17 that is inclined from the vicinity of the recording start point H toward the rotary drive shaft 14 of the rotary cylinder 10 is formed. Tape end 13c and magnetic head 11
At the intersection of the rotation loci of the magnetic tape, as in the first embodiment,
13 is guided by the second tape guide portion 17a. Therefore, the magnetic head 11 starts the head touch smoothly without contacting the end portion 13c of the magnetic tape 13, and obtains a predetermined recording locus. The tape guide 20 is a tape guide for eliminating the twist of the tape caused by winding the tape around the tape guide 17.

Although not described in both the first and second embodiments, the tape guide 17 is provided with an arc-shaped head escape groove slightly wider than the head width corresponding to the recording locus 11a of the magnetic head 11, Is projected from the magnetic tape 13 to obtain an appropriate head tape contact pressure.

According to the magnetic recording / reproducing apparatus of the present invention, the following effects can be obtained.

(1) Since the magnetic tape is not locally deformed in order to prevent its end from coming into contact with the magnetic head, an unreasonable force is not applied to the tape.

(2) Since the magnetic tapes are separated in the direction perpendicular to the direction connecting the recording start point and the rotary drive shaft of the rotary cylinder, the head touch can be started more smoothly. Further, the head touch can be reliably managed even if the distance between the tape end and the recording start point is small.

[Brief description of drawings]

FIG. 1 is a plan view of a magnetic recording / reproducing apparatus running portion in one embodiment of the present invention, FIG. 2 is a front view of FIG. 1, and FIG.
FIG. 4 is a plan view of the tape running portion of the same apparatus in FIG.
FIG. 5 is an enlarged plan view of a main portion of the figure, FIG. 5 is a perspective view of a conventional tape running portion, and FIG. 6 is a tape pattern diagram of arc recording. 10 …… Rotating cylinder, 11 …… Recording head, 13 …… Magnetic tape, 17 …… Tape guide, 18 …… Tape running direction.

Claims (1)

(57) [Claims] 1. A rotary cylinder having a rotary shaft perpendicular to a recording surface of a magnetic tape, and a magnetic head mounted on the rotary cylinder forming a plurality of substantially arcuate recording tracks on the magnetic tape. A magnetic recording / reproducing apparatus, comprising: first magnetic tape guide means for guiding the magnetic tape at a position where it can contact the magnetic head on a plane parallel to the plane of rotation of the rotary cylinder; A second magnetic tape guiding means which is spaced apart from a plane parallel to the plane and which is guided at a position where the magnetic head does not come into contact with the magnetic head; The magnetic tape at the intersection of the edge line of the tape width direction and the locus of rotation of the magnetic head is guided by the second magnetic tape guide means. Magnetic recording and reproducing apparatus according to symptoms.