JP2650407B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus for recording or reproducing a signal on a magnetic recording medium.

2. Description of the Related Art As a conventional magnetic recording / reproducing apparatus, for example,
No. 9392. FIG. 6 is an external perspective view of this conventional magnetic recording / reproducing apparatus. A magnetic head 3 is mounted on a rotary cylinder 2 which is rotated in the direction of arrow 5 by a rotary drive shaft 1. The magnetic tape 4 moves in the direction of arrow 6 to form a recording track 7. Further, the magnetic tape 4 is moved between the long grooves 8a provided at both ends of the guide plate 8 and the convex portions 10a of the holding plate 10 to be engaged.
a is guided and guided while being bent.

Problems to be Solved by the Invention However, in the above configuration, the bending length of the end portion of the magnetic tape is shortened in order to increase the effective recording area on the magnetic tape as much as possible, and it is difficult to bend uniformly without distortion. there were. Therefore, it has been difficult to smoothly move the magnetic head toward the end of the magnetic tape. Also, bending the magnetic tape in a state where the bending length is short causes an excessive bending stress to act on the magnetic tape, which also causes a damage such as a crack on the magnetic tape. As a solution to this, it is conceivable to make the bending length of the magnetic tape longer to make the bending angle gentler, but in this case, there is a problem that the effective recording area on the magnetic tape is reduced. Also, since the magnetic tape runs with both ends bent, it is extremely difficult to obtain stable magnetic tape running because the end of the magnetic tape is easily damaged.

In view of the foregoing, the present invention provides a rotating magnetic head that smoothly moves toward the end of a magnetic tape without applying distortion to the magnetic tape and in a state where stable magnetic tape running and stable signal recording or reproducing operation are secured. It is an object of the present invention to provide a magnetic recording / reproducing device which can enter.

Means for Solving the Problems The present invention provides a magnetic recording / reproducing apparatus including a magnetic tape guide plate having a concave groove provided with a convex surface and a variable width, and a scanner unit having a rotating magnetic head. It is.

The present invention allows the magnetic tape to travel in a very naturally curved state along the convex guide plate by the above-described configuration, so that the rotating magnetic head can be used during recording or reproduction without forcibly bending the end of the magnetic tape. It can smoothly enter the end of the magnetic tape. Also, since the width of the groove provided on the guide plate of the magnetic tape is changed according to the amount of insertion of the rotary magnetic head into the magnetic tape in accordance with the scanning position of the rotary magnetic head, recording or recording on the magnetic tape is always stable. Playback can be performed.

FIG. 1 is a plan view of a magnetic recording / reproducing apparatus according to a first embodiment of the present invention. In FIG. 1, a magnetic tape 20 is regulated and guided by guide posts 21 and 22, and is transported in the direction of arrow 23. Guide plate 24 is magnetic tape
20 runs are guided from the back (non-magnetic side). The surface of the guide plate 24 is formed in a substantially convex shape when viewed from the direction in which the magnetic tape 20 is transported. The scanner unit 25 includes a driving unit 26 and a rotating disk 27, and the rotating disk 27 has a magnetic head 28.
a, 28b, 28c, and 28d are disposed so as to be substantially orthogonal to each other via mounting plates 30a, 30b, 38c, and 30d, respectively, and the rotating disk 27 rotates in the direction of the arrow 31 around the rotating shaft 29. The guide plate 24 is provided with a concave groove 32 corresponding to the position where the magnetic heads 28a to 28d scan, and the groove width is set to the magnetic heads 28a to 28d.
It gradually changes between the entry and exit of 8d (No. 5
Figure). That is, the groove width of the concave groove portion 32 is set so as to gradually change as the amount of insertion of the magnetic heads 28a to 28d with respect to the magnetic tape 20 running along the guide plate 24 whose surface is convexly curved. . In addition, the groove depth of the concave groove portion 32 is a magnetic head.
The tips of 28a to 28d are provided at a depth such that they do not contact the groove bottom. Arrows 33a and 33b in FIG. 1 indicate angular positions when the magnetic heads 28a to 28d rotate around the rotation shaft 29.

The operation of the magnetic recording / reproducing apparatus of the present embodiment configured as described above will be described below.

In FIG. 1, the magnetic tape 20 includes a guide post 21 and a guide plate 2.
4 and guided by the guide post 22 and transported in the direction of the arrow 23. Next, the rotating disk 27 rotates in the direction of arrow 31. At this time, when the positions of the magnetic heads 28a to 28d are at the angular positions indicated by arrows 33a, the tips of the magnetic heads 28a to 28d are magnetic tapes.
When the magnetic heads 28a to 28d are positioned above the surface of the magnetic head 20 and the positions of the magnetic heads 28a to 28d are at the angular positions indicated by arrows 33b, the magnetic heads 28a to 28d
The leading end of d is set in a positional relationship where it starts to contact the surface of the magnetic tape 20. That is, as the magnetic heads 28a to 28d rotate and advance from the entrance to the magnetic tape 20 to the exit direction, the insertion amount of the magnetic heads 28a to 28d into the magnetic tape 20 gradually increases, and approximately at the center of the width of the magnetic tape 20. The groove width of the concave groove 32 provided on the guide plate 24 increases with an increase in the insertion amount of the magnetic heads 28a to 28d, and the groove width gradually increases as the magnetic head 28a to 28d moves.
Since the groove width of the concave groove portion 32 decreases as the insertion amount of 28a-28d decreases, the contact state between the magnetic heads 28a-28d and the magnetic tape 20 can always be kept substantially the same.

The rotation of the magnetic heads 28a to 28d causes the magnetic tape 20 to rotate.
Recording (or reproduction) tracks 34 are sequentially formed thereon (FIG. 4). Furthermore, recording (or reproducing) on the magnetic tape 20
The scanned magnetic heads 28a to 28d return to the position of the arrow 33a (FIG. 1) after retreating from the magnetic tape 20, but at this time, the magnetic tape 20 travels somewhat downward along the guide plate end 24b. (FIG. 3), the front ends of the magnetic heads 28a to 28d do not collide with the ends of the magnetic tape 20.

As described above, according to the present embodiment, the surface shape of the guide plate 24 for guiding the magnetic tape is provided so as to be substantially convex when viewed from the traveling direction of the magnetic tape 20.
Since 20 runs gently curved along the substantially convex shape of the guide plate 24, the magnetic heads 28a to 28d do not collide toward the end of the magnetic tape 20 and smoothly move from the end of the magnetic tape 20. You can enter. Also, the width of the concave groove 32 provided on the guide plate 24 of the magnetic tape 20 is changed according to the insertion amount of the magnetic heads 28a to 28d into the magnetic tape 20 in accordance with the running position of the magnetic heads 28a to 28d. In addition, the contact state between the magnetic tape 20 and the magnetic heads 28a to 28d can always be kept substantially uniform, and stable recording (or reproduction) can always be performed. Further, since there is no need to significantly deform the end of the magnetic tape 20, stable regulation guide traveling of the magnetic tape 20 becomes possible.

Effects of the Invention As described above, according to the present invention, since the magnetic tape runs along the substantially convex surface shape of the tape guide plate, the magnetic head can smoothly move without colliding with the end of the magnetic tape. You can enter from. Further, since no distortion is applied to the end of the magnetic tape, damage to the magnetic tape can be prevented, and a stable tape running can always be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a magnetic recording / reproducing apparatus showing one embodiment of the present invention, FIG. 2 is a front view of the embodiment, FIG. 3 is a side view of the embodiment, and FIG. FIG. 5 is a plan view of a magnetic tape, FIG. 5 is an external perspective view of a guide plate, and FIG. 6 is an external perspective view of a conventional magnetic recording / reproducing apparatus. 20: magnetic tape, 21, 22: guide post, 24: guide plate, 26: drive unit, 27: rotating disk, 28a, 28b, 28c, 28d: magnetic head.

Claims (1)

(57) [Claims] The present invention comprises a guide plate for guiding the running of a magnetic tape and a scanner unit having a rotating magnetic head for forming a track locus in an arc shape with respect to the magnetic tape during recording or reproduction. Surface and the surface shape of the guide plate facing each other with the magnetic tape interposed therebetween have a convex shape along a path from the entrance side to the exit side of the rotary magnetic head, and correspond to the position of the rotary magnetic head. A magnetic recording / reproducing apparatus, wherein the width of the provided groove is changed according to the insertion amount of the rotary magnetic head from the surface of the guide plate.