JPH01199379A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To evade deformation of a recording medium at both edge parts due to a magnetic head by providing a recording medium guiding and a recording medium position regulating means. CONSTITUTION:Since nonrecording parts on both edge surfaces of the recording medium in a magnetic head scanning locus position are guided by the recording medium guiding means (tape guide) 17 to be apart from the magnetic head 11, a collision between the edge surface of the recording medium (magnetic tape) 13 and the magnetic head 11 can be evaded by the recording medium guiding means 17 during the recording or reproducing time when fixed tension is given to the recording medium 13, and the recording medium 13 is traveled along the recording medium guiding means 17. Moreover, even when the recording medium 13 is apart from the recording medium guiding means 17, e.g., under its slackening state, etc., the collision between the recording medium 13 edge surface and the magnetic head 11 can be evaded, because the recording medium position regulating means 20 is provided to prohibit the recording medium 13 on its edge part from intruding into the rotating space of the magnetic head.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention forms arcuate recording tracks on a recording medium,
It is connected to a magnetic recording/reproducing device that performs recording or reproduction from the recording medium.

Conventional technology Conventionally, when performing high-density recording in this type of magnetic recording/reproducing device, a so-called helical scan method was used in which a straight recording track was formed at a certain inclination with respect to the longitudinal direction of the recording medium. . In this method, a magnetic head scans the recording track during reproduction and converts the recorded content into an electrical signal. Therefore, in order to make this helical scan possible, magnetic recording and reproducing devices are equipped with a magnetic head on the side of a rotating cylinder that can scan in a direction with a certain inclination with respect to the feeding direction of the recording medium, and also rotate the recording medium. It is configured to be wrapped around the side of the cylinder. However, the above configuration requires a sophisticated loading mechanism and tape path for winding the recording medium around the rotating cylinder, resulting in a complicated structure.

Therefore, a method has been proposed in the past, for example, in Japanese Patent Laid-Open No. 159392/1983, in which a recording track is formed in an arc shape without wrapping the recording medium around a rotating cylinder. FIG. 6 shows its main traveling part, and FIG. 7 shows the tape pattern. In FIG. 0, l is a rotational drive shaft, 2 is a rotation cylinder for mounting a magnetic head 3, and 4 is a recording medium. Reference numeral 5 denotes a recording medium guide plate provided at opposing positions with the rotating cylinder 2 and the recording medium 4 interposed therebetween. It has long grooves 5a and 5b. Presser plates 6 are provided at both ends of the recording medium guide plate 6 in the recording medium running direction 7, opposing each other with the recording medium in between, and convex portions 6a provided at both ends in the width direction of the recording medium;
6b are configured to fit into the long grooves 5a, 5b of the recording medium guide plate 5.

In the above configuration, the recording medium 4 traveling within the recording medium guide plate 5 and the rotary cylinder 2 is pressed by the press plate 6 at both ends of the recording medium guide plate 5, and both ends 4a and 4b of the press plate 6 are used to guide the recording medium. Since it is pressed and bent by the plate 5111, an arcuate track can be formed without deforming the recording medium 4 or damaging both ends thereof by the magnetic head 3 of the rotary cylinder 2.

Problems to be Solved by the Invention However, in this configuration, both ends of the recording medium 4 are forcibly bent, and the magnetic head and the recording medium are separated at these ends. Although deformation of the recording medium 4 can be avoided, damage to both ends of the recording medium 4 can be avoided due to this forced bending in the running system and a return to the normal state without deformation in the tape width direction near the reel. Especially when the recording medium 4 is run at high speed, this pushing and bending and returning to the normal state will be repeated, and the damage to the recording medium, especially at both ends, will be great.

In addition, the lower edge of the recording medium is important for securing 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 edge of the recording medium is is likely to be inaccurate.

Therefore, the present invention provides a recording medium guiding means that avoids deformation of both ends of the recording medium caused by a magnetic head without adding any forced bending means to the recording medium.

Means for Solving the Problems The present invention provides a rotary cylinder supported by a rotary drive shaft perpendicular to the magnetic surface of a recording medium, a plurality of magnetic heads equally divided and arranged at the end of the rotary cylinder, and the above-mentioned magnetic head. The recording medium has recording medium guiding means for slidingly guiding the back surface of the recording medium, and recording medium position regulating means for regulating the position of the recording medium relative to the magnetic surface of the recording medium, and the recording medium has a A magnetic recording/reproducing device that performs recording or reproducing so as to form an unrecorded portion and a plurality of substantially arcuate recording track portions at both ends of the recording medium in the width direction, the magnetic recording and reproducing device comprising: the unrecorded portions at both ends of the recording medium and the magnetic head; The end surface of the recording medium guided by the recording medium guide means in a direction away from the magnetic head over the entire width of the recording medium is guided by the recording medium regulating means into the rotation space of the magnetic head. This is a magnetic recording/reproducing device that is characterized in that it is regulated to prevent entry.

At the scanning locus position of the operating magnetic head, the unrecorded portions on both end faces of the recording medium are guided in a direction away from the magnetic head by the recording medium guide means, so a certain tension is applied to the recording medium and the recording medium moves toward the recording medium guide means. During recording and playback when the recording medium is traveling along the recording medium guide means, collision between the end face of the recording medium and the magnetic head can be avoided, and furthermore, even if the recording medium is separated from the recording medium guiding means, such as when the tape sag, the recording medium is equipped with a recording medium position regulating means to prevent its end face from entering the magnetic head rotation space.
Collision between the end face of the recording medium and the magnetic head can be avoided.

Embodiment An embodiment of the present invention will be described with reference to the drawings. FIG. 4 is a plan view of the recording medium 13 (hereinafter referred to as magnetic tape) traveling means of the present invention. FIG. 5 is a front view of the same, in which the rotational cylinder lO and the rotation locus 11a of the magnetic head 11 are shown by imaginary lines. Numeral 12 is a plate on which the magnetic helads 11 are attached, and they are arranged in four equal parts on the outer periphery of the rotating cylinder 10 together with the magnetic head 11, so that the phase angle of the magnetic head 11 is 90 degrees. Reference numeral 18 indicates the running direction of the magnetic tape 13 during recording and reproduction. 19 indicates the rotation direction of the rotary cylinder IO.

The recording locus on the magnetic tape 13 by the magnetic head 11 is approximately arc-shaped, and the recording width is 95 degrees based on the rotation angle of the rotary cylinder 10, so that the signal is continuously recorded, including the 5 degree overlap recording area. can be recorded. As shown in FIG. 7, the recording track is formed as a substantially arc-shaped locus in the center of the tape with unrecorded portions (tape edge guards) a at both ends of the magnetic tape 13. 14 indicates the rotation of the rotary cylinder 10. It is the drive shaft. 15 and 16 are rotating posts that guide the magnetic tape 13, and 17 is a tape guide that guides the magnetic tape 13 in a plane parallel to the plane of rotation of the rotating cylinder IO.

The tape guide 17 includes a first tape guide part 17b parallel to the rotation plane of the rotary cylinder 1O, and arcuate second tape guide parts 17a and 17c formed continuously with the first tape guide part 17b. Become. Line A is a line that passes through the intersection of the rotation locus 11a of the magnetic head 11 and the magnetic chi 113 and is perpendicular to the end 13c of the magnetic tape 13. Line B is a line that passes through the recording start point of the magnetic head 11 on the magnetic tape 13 and is perpendicular to the end 13c of the magnetic tape 13. FIG. 1 shows a partially enlarged view of the tape guide 17 and its vicinity. At the position of the aforementioned line B, the magnetic tape 13 is a magnetic tape 13b guided by the first tape guide portion 17b. On the other hand, line A is the position of the magnetic tape 13a guided by the second tape guide section 17a.

Since the line C indicates the rotation locus of the tip of the magnetic head 11, the intersection of this line C and the magnetic tape 13a indicates the starting point of the helad touch. Since this intersection B is on the armor of lines A and B, the magnetic helad 11 is connected to the magnetic tape 13.
The contact starts from point F, which is a position slightly closer to the center of the tape than the end 13c of the tape. In other words, the magnetic head 11 does not collide with the end 13c of the magnetic tape 13, and the magnetic head 11 starts touching the magnetic tape 13 smoothly. The magnetic helad 11 is the magnetic tape 13
When the magnetic head 1 separates from the magnetic tape 13, the magnetic head 1 also smoothly separates from the magnetic tape 13 and does not give any vibration to the magnetic tape 13.

A tape position regulating member 20 is provided at a position opposing the magnetic surface of the magnetic tape 13b running along the first tape guide portion 17b with a slight clearance from the magnetic tape 13b. 2 shows a front view of FIG. 1, and FIG. 3 shows a side view of FIG.
b slightly extends to the rotating cylinder 101N. Further, the tape position regulating member 20 has a right shoulder portion 20c extending beyond the line A to near the line E (the in which passes through the intersection and is parallel to the lines A and B).

When recording or reproducing signals, a precisely controlled constant tension is applied to the magnetic tape 13, so it is safe to assume that the magnetic tape 13 always runs along the tape guide 17. On line A, the magnetic head 11 and the magnetic tape 13 are separated by a certain distance, which provides enough margin to avoid collision between the two. However, when the tape is running at high speed or when the tape is stopped, the tape tension may drop to zero, causing the tape to sag. If tape slack occurs, for example, in the state 13d shown by the imaginary line in FIG. 1, the magnetic head 11 will collide with the end surface 13c of the magnetic tape 13. However, if the tape position regulating member 20 is provided, even if the tape sag, the magnetic tape 13 will only be in the state shown by hatching 13e.
This tape slack occurs only from lines A and B passing through the intersection of the rotation locus 11a of the magnetic head 11 and the end surface 13c of the magnetic tape 13, so the magnetic tape 1
Collision between the end surface 13c of No. 3 and the magnetic head 11 can be avoided.

The tape guide 17 has a recording trajectory 11a of the magnetic head 11.
Correspondingly, an arcuate head escape groove 21 is formed which is slightly wider than the head width, and the magnetic head 11 is configured to protrude from the magnetic tape 13 to obtain an appropriate head-tape contact pressure.

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

(1) The magnetic tape is not locally deformed to prevent its ends from coming into contact with the magnetic head, so no excessive force is applied to the tape.

(2) Even if the tape sag occurs when the tape is fed at high speed or when the tape stops running, the tape position regulating member can prevent the magnetic head from colliding with the end surface of the magnetic tape.
There are no problems such as deformation of the magnetic tape.

(3) Since the magnetic tapes are separated smoothly at the recording end point as well as at the recording start point,
Problems such as vibrations occurring in the tape and adversely affecting reproduced images do not occur. (4) Since the lower end of the tape is not forcibly bent, the position of the recording locus from the lower end of the tape can be easily guaranteed, and performance equivalent to conventional helical scanning in terms of compatibility can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a plan view of the upper part of the traveling section of a magnetic recording and reproducing apparatus in an embodiment of the present invention, FIG. 2 is a front view of FIG. 1, FIG. 3 is a left side view of FIG. 1, and FIG. 5 is a plan view of the entire recording/reproducing apparatus, FIG. 5 is a front view of FIG. 4, FIG. 6 is a perspective view of a conventional running section, and FIG. 7 is a tape pattern diagram for arc recording. lO...Rotating cylinder, 11...Fist recording head, 13
...Magnetic tape, 17...Φ tape guide, 18...
・Tape running direction. Name of agent Patent attorney Toshio Nakao Haka1 person No. 1rIJ Figure 3 Figure 4rlli Figure 6 Figure 7

Claims (1)

[Claims] A rotary cylinder supported by a rotary drive shaft perpendicular to the magnetic surface of the recording medium, a plurality of magnetic heads equally divided and arranged at the end of the rotary cylinder, and a recording head that slides and guides the back surface of the recording medium. The recording medium has a medium guiding means and a recording medium position regulating means for regulating the position of the recording medium relative to the magnetic surface of the recording medium, and the recording medium has an unrecorded portion and a plurality of unrecorded portions at both ends in the width direction of the recording medium. A magnetic recording/reproducing device that performs recording or reproducing to form a generally arcuate recording track portion, the recording medium having an unrecorded portion at both ends of the recording medium and the scanning trajectory section of the magnetic head over the entire width of the recording medium. The end surface of the recording medium guided by the recording medium guiding means in a direction away from the magnetic head is restricted by the recording medium restricting means so that it cannot enter into the rotation space of the magnetic head. Magnetic recording and reproducing device.